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-rw-r--r--vendor/image/src/codecs/webp/decoder.rs399
-rw-r--r--vendor/image/src/codecs/webp/encoder.rs242
-rw-r--r--vendor/image/src/codecs/webp/extended.rs839
-rw-r--r--vendor/image/src/codecs/webp/huffman.rs202
-rw-r--r--vendor/image/src/codecs/webp/loop_filter.rs147
-rw-r--r--vendor/image/src/codecs/webp/lossless.rs783
-rw-r--r--vendor/image/src/codecs/webp/lossless_transform.rs464
-rw-r--r--vendor/image/src/codecs/webp/mod.rs28
-rw-r--r--vendor/image/src/codecs/webp/transform.rs77
-rw-r--r--vendor/image/src/codecs/webp/vp8.rs2932
10 files changed, 0 insertions, 6113 deletions
diff --git a/vendor/image/src/codecs/webp/decoder.rs b/vendor/image/src/codecs/webp/decoder.rs
deleted file mode 100644
index 9120290..0000000
--- a/vendor/image/src/codecs/webp/decoder.rs
+++ /dev/null
@@ -1,399 +0,0 @@
-use byteorder::{LittleEndian, ReadBytesExt};
-use std::convert::TryFrom;
-use std::io::{self, Cursor, Error, Read};
-use std::marker::PhantomData;
-use std::{error, fmt, mem};
-
-use crate::error::{DecodingError, ImageError, ImageResult, ParameterError, ParameterErrorKind};
-use crate::image::{ImageDecoder, ImageFormat};
-use crate::{color, AnimationDecoder, Frames, Rgba};
-
-use super::lossless::{LosslessDecoder, LosslessFrame};
-use super::vp8::{Frame as VP8Frame, Vp8Decoder};
-
-use super::extended::{read_extended_header, ExtendedImage};
-
-/// All errors that can occur when attempting to parse a WEBP container
-#[derive(Debug, Clone, Copy)]
-pub(crate) enum DecoderError {
- /// RIFF's "RIFF" signature not found or invalid
- RiffSignatureInvalid([u8; 4]),
- /// WebP's "WEBP" signature not found or invalid
- WebpSignatureInvalid([u8; 4]),
- /// Chunk Header was incorrect or invalid in its usage
- ChunkHeaderInvalid([u8; 4]),
-}
-
-impl fmt::Display for DecoderError {
- fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
- struct SignatureWriter([u8; 4]);
- impl fmt::Display for SignatureWriter {
- fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
- write!(
- f,
- "[{:#04X?}, {:#04X?}, {:#04X?}, {:#04X?}]",
- self.0[0], self.0[1], self.0[2], self.0[3]
- )
- }
- }
-
- match self {
- DecoderError::RiffSignatureInvalid(riff) => f.write_fmt(format_args!(
- "Invalid RIFF signature: {}",
- SignatureWriter(*riff)
- )),
- DecoderError::WebpSignatureInvalid(webp) => f.write_fmt(format_args!(
- "Invalid WebP signature: {}",
- SignatureWriter(*webp)
- )),
- DecoderError::ChunkHeaderInvalid(header) => f.write_fmt(format_args!(
- "Invalid Chunk header: {}",
- SignatureWriter(*header)
- )),
- }
- }
-}
-
-impl From<DecoderError> for ImageError {
- fn from(e: DecoderError) -> ImageError {
- ImageError::Decoding(DecodingError::new(ImageFormat::WebP.into(), e))
- }
-}
-
-impl error::Error for DecoderError {}
-
-/// All possible RIFF chunks in a WebP image file
-#[allow(clippy::upper_case_acronyms)]
-#[derive(Debug, Clone, Copy, PartialEq)]
-pub(crate) enum WebPRiffChunk {
- RIFF,
- WEBP,
- VP8,
- VP8L,
- VP8X,
- ANIM,
- ANMF,
- ALPH,
- ICCP,
- EXIF,
- XMP,
-}
-
-impl WebPRiffChunk {
- pub(crate) fn from_fourcc(chunk_fourcc: [u8; 4]) -> ImageResult<Self> {
- match &chunk_fourcc {
- b"RIFF" => Ok(Self::RIFF),
- b"WEBP" => Ok(Self::WEBP),
- b"VP8 " => Ok(Self::VP8),
- b"VP8L" => Ok(Self::VP8L),
- b"VP8X" => Ok(Self::VP8X),
- b"ANIM" => Ok(Self::ANIM),
- b"ANMF" => Ok(Self::ANMF),
- b"ALPH" => Ok(Self::ALPH),
- b"ICCP" => Ok(Self::ICCP),
- b"EXIF" => Ok(Self::EXIF),
- b"XMP " => Ok(Self::XMP),
- _ => Err(DecoderError::ChunkHeaderInvalid(chunk_fourcc).into()),
- }
- }
-
- pub(crate) fn to_fourcc(&self) -> [u8; 4] {
- match self {
- Self::RIFF => *b"RIFF",
- Self::WEBP => *b"WEBP",
- Self::VP8 => *b"VP8 ",
- Self::VP8L => *b"VP8L",
- Self::VP8X => *b"VP8X",
- Self::ANIM => *b"ANIM",
- Self::ANMF => *b"ANMF",
- Self::ALPH => *b"ALPH",
- Self::ICCP => *b"ICCP",
- Self::EXIF => *b"EXIF",
- Self::XMP => *b"XMP ",
- }
- }
-}
-
-enum WebPImage {
- Lossy(VP8Frame),
- Lossless(LosslessFrame),
- Extended(ExtendedImage),
-}
-
-/// WebP Image format decoder. Currently only supports lossy RGB images or lossless RGBA images.
-pub struct WebPDecoder<R> {
- r: R,
- image: WebPImage,
-}
-
-impl<R: Read> WebPDecoder<R> {
- /// Create a new WebPDecoder from the Reader ```r```.
- /// This function takes ownership of the Reader.
- pub fn new(r: R) -> ImageResult<WebPDecoder<R>> {
- let image = WebPImage::Lossy(Default::default());
-
- let mut decoder = WebPDecoder { r, image };
- decoder.read_data()?;
- Ok(decoder)
- }
-
- //reads the 12 bytes of the WebP file header
- fn read_riff_header(&mut self) -> ImageResult<u32> {
- let mut riff = [0; 4];
- self.r.read_exact(&mut riff)?;
- if &riff != b"RIFF" {
- return Err(DecoderError::RiffSignatureInvalid(riff).into());
- }
-
- let size = self.r.read_u32::<LittleEndian>()?;
-
- let mut webp = [0; 4];
- self.r.read_exact(&mut webp)?;
- if &webp != b"WEBP" {
- return Err(DecoderError::WebpSignatureInvalid(webp).into());
- }
-
- Ok(size)
- }
-
- //reads the chunk header, decodes the frame and returns the inner decoder
- fn read_frame(&mut self) -> ImageResult<WebPImage> {
- let chunk = read_chunk(&mut self.r)?;
-
- match chunk {
- Some((cursor, WebPRiffChunk::VP8)) => {
- let mut vp8_decoder = Vp8Decoder::new(cursor);
- let frame = vp8_decoder.decode_frame()?;
-
- Ok(WebPImage::Lossy(frame.clone()))
- }
- Some((cursor, WebPRiffChunk::VP8L)) => {
- let mut lossless_decoder = LosslessDecoder::new(cursor);
- let frame = lossless_decoder.decode_frame()?;
-
- Ok(WebPImage::Lossless(frame.clone()))
- }
- Some((mut cursor, WebPRiffChunk::VP8X)) => {
- let info = read_extended_header(&mut cursor)?;
-
- let image = ExtendedImage::read_extended_chunks(&mut self.r, info)?;
-
- Ok(WebPImage::Extended(image))
- }
- None => Err(ImageError::IoError(Error::from(
- io::ErrorKind::UnexpectedEof,
- ))),
- Some((_, chunk)) => Err(DecoderError::ChunkHeaderInvalid(chunk.to_fourcc()).into()),
- }
- }
-
- fn read_data(&mut self) -> ImageResult<()> {
- let _size = self.read_riff_header()?;
-
- let image = self.read_frame()?;
-
- self.image = image;
-
- Ok(())
- }
-
- /// Returns true if the image as described by the bitstream is animated.
- pub fn has_animation(&self) -> bool {
- match &self.image {
- WebPImage::Lossy(_) => false,
- WebPImage::Lossless(_) => false,
- WebPImage::Extended(extended) => extended.has_animation(),
- }
- }
-
- /// Sets the background color if the image is an extended and animated webp.
- pub fn set_background_color(&mut self, color: Rgba<u8>) -> ImageResult<()> {
- match &mut self.image {
- WebPImage::Extended(image) => image.set_background_color(color),
- _ => Err(ImageError::Parameter(ParameterError::from_kind(
- ParameterErrorKind::Generic(
- "Background color can only be set on animated webp".to_owned(),
- ),
- ))),
- }
- }
-}
-
-pub(crate) fn read_len_cursor<R>(r: &mut R) -> ImageResult<Cursor<Vec<u8>>>
-where
- R: Read,
-{
- let unpadded_len = u64::from(r.read_u32::<LittleEndian>()?);
-
- // RIFF chunks containing an uneven number of bytes append
- // an extra 0x00 at the end of the chunk
- //
- // The addition cannot overflow since we have a u64 that was created from a u32
- let len = unpadded_len + (unpadded_len % 2);
-
- let mut framedata = Vec::new();
- r.by_ref().take(len).read_to_end(&mut framedata)?;
-
- //remove padding byte
- if unpadded_len % 2 == 1 {
- framedata.pop();
- }
-
- Ok(io::Cursor::new(framedata))
-}
-
-/// Reads a chunk header FourCC
-/// Returns None if and only if we hit end of file reading the four character code of the chunk
-/// The inner error is `Err` if and only if the chunk header FourCC is present but unknown
-pub(crate) fn read_fourcc<R: Read>(r: &mut R) -> ImageResult<Option<ImageResult<WebPRiffChunk>>> {
- let mut chunk_fourcc = [0; 4];
- let result = r.read_exact(&mut chunk_fourcc);
-
- match result {
- Ok(()) => {}
- Err(err) => {
- if err.kind() == io::ErrorKind::UnexpectedEof {
- return Ok(None);
- } else {
- return Err(err.into());
- }
- }
- }
-
- let chunk = WebPRiffChunk::from_fourcc(chunk_fourcc);
- Ok(Some(chunk))
-}
-
-/// Reads a chunk
-/// Returns an error if the chunk header is not a valid webp header or some other reading error
-/// Returns None if and only if we hit end of file reading the four character code of the chunk
-pub(crate) fn read_chunk<R>(r: &mut R) -> ImageResult<Option<(Cursor<Vec<u8>>, WebPRiffChunk)>>
-where
- R: Read,
-{
- if let Some(chunk) = read_fourcc(r)? {
- let chunk = chunk?;
- let cursor = read_len_cursor(r)?;
- Ok(Some((cursor, chunk)))
- } else {
- Ok(None)
- }
-}
-
-/// Wrapper struct around a `Cursor<Vec<u8>>`
-pub struct WebpReader<R>(Cursor<Vec<u8>>, PhantomData<R>);
-impl<R> Read for WebpReader<R> {
- fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
- self.0.read(buf)
- }
- fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
- if self.0.position() == 0 && buf.is_empty() {
- mem::swap(buf, self.0.get_mut());
- Ok(buf.len())
- } else {
- self.0.read_to_end(buf)
- }
- }
-}
-
-impl<'a, R: 'a + Read> ImageDecoder<'a> for WebPDecoder<R> {
- type Reader = WebpReader<R>;
-
- fn dimensions(&self) -> (u32, u32) {
- match &self.image {
- WebPImage::Lossy(vp8_frame) => {
- (u32::from(vp8_frame.width), u32::from(vp8_frame.height))
- }
- WebPImage::Lossless(lossless_frame) => (
- u32::from(lossless_frame.width),
- u32::from(lossless_frame.height),
- ),
- WebPImage::Extended(extended) => extended.dimensions(),
- }
- }
-
- fn color_type(&self) -> color::ColorType {
- match &self.image {
- WebPImage::Lossy(_) => color::ColorType::Rgb8,
- WebPImage::Lossless(_) => color::ColorType::Rgba8,
- WebPImage::Extended(extended) => extended.color_type(),
- }
- }
-
- fn into_reader(self) -> ImageResult<Self::Reader> {
- match &self.image {
- WebPImage::Lossy(vp8_frame) => {
- let mut data = vec![0; vp8_frame.get_buf_size()];
- vp8_frame.fill_rgb(data.as_mut_slice());
- Ok(WebpReader(Cursor::new(data), PhantomData))
- }
- WebPImage::Lossless(lossless_frame) => {
- let mut data = vec![0; lossless_frame.get_buf_size()];
- lossless_frame.fill_rgba(data.as_mut_slice());
- Ok(WebpReader(Cursor::new(data), PhantomData))
- }
- WebPImage::Extended(extended) => {
- let mut data = vec![0; extended.get_buf_size()];
- extended.fill_buf(data.as_mut_slice());
- Ok(WebpReader(Cursor::new(data), PhantomData))
- }
- }
- }
-
- fn read_image(self, buf: &mut [u8]) -> ImageResult<()> {
- assert_eq!(u64::try_from(buf.len()), Ok(self.total_bytes()));
-
- match &self.image {
- WebPImage::Lossy(vp8_frame) => {
- vp8_frame.fill_rgb(buf);
- }
- WebPImage::Lossless(lossless_frame) => {
- lossless_frame.fill_rgba(buf);
- }
- WebPImage::Extended(extended) => {
- extended.fill_buf(buf);
- }
- }
- Ok(())
- }
-
- fn icc_profile(&mut self) -> Option<Vec<u8>> {
- if let WebPImage::Extended(extended) = &self.image {
- extended.icc_profile()
- } else {
- None
- }
- }
-}
-
-impl<'a, R: 'a + Read> AnimationDecoder<'a> for WebPDecoder<R> {
- fn into_frames(self) -> Frames<'a> {
- match self.image {
- WebPImage::Lossy(_) | WebPImage::Lossless(_) => {
- Frames::new(Box::new(std::iter::empty()))
- }
- WebPImage::Extended(extended_image) => extended_image.into_frames(),
- }
- }
-}
-
-#[cfg(test)]
-mod tests {
- use super::*;
-
- #[test]
- fn add_with_overflow_size() {
- let bytes = vec![
- 0x52, 0x49, 0x46, 0x46, 0xaf, 0x37, 0x80, 0x47, 0x57, 0x45, 0x42, 0x50, 0x6c, 0x64,
- 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xfb, 0x7e, 0x73, 0x00, 0x06, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65,
- 0x40, 0xfb, 0xff, 0xff, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65,
- 0x00, 0x00, 0x00, 0x00, 0x62, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x49,
- 0x49, 0x54, 0x55, 0x50, 0x4c, 0x54, 0x59, 0x50, 0x45, 0x33, 0x37, 0x44, 0x4d, 0x46,
- ];
-
- let data = std::io::Cursor::new(bytes);
-
- let _ = WebPDecoder::new(data);
- }
-}
diff --git a/vendor/image/src/codecs/webp/encoder.rs b/vendor/image/src/codecs/webp/encoder.rs
deleted file mode 100644
index 0383046..0000000
--- a/vendor/image/src/codecs/webp/encoder.rs
+++ /dev/null
@@ -1,242 +0,0 @@
-//! Encoding of WebP images.
-///
-/// Uses the simple encoding API from the [libwebp] library.
-///
-/// [libwebp]: https://developers.google.com/speed/webp/docs/api#simple_encoding_api
-use std::io::Write;
-
-use libwebp::{Encoder, PixelLayout, WebPMemory};
-
-use crate::error::{
- EncodingError, ParameterError, ParameterErrorKind, UnsupportedError, UnsupportedErrorKind,
-};
-use crate::flat::SampleLayout;
-use crate::{ColorType, ImageEncoder, ImageError, ImageFormat, ImageResult};
-
-/// WebP Encoder.
-pub struct WebPEncoder<W> {
- inner: W,
- quality: WebPQuality,
-}
-
-/// WebP encoder quality.
-#[derive(Debug, Copy, Clone)]
-pub struct WebPQuality(Quality);
-
-#[derive(Debug, Copy, Clone)]
-enum Quality {
- Lossless,
- Lossy(u8),
-}
-
-impl WebPQuality {
- /// Minimum lossy quality value (0).
- pub const MIN: u8 = 0;
- /// Maximum lossy quality value (100).
- pub const MAX: u8 = 100;
- /// Default lossy quality (80), providing a balance of quality and file size.
- pub const DEFAULT: u8 = 80;
-
- /// Lossless encoding.
- pub fn lossless() -> Self {
- Self(Quality::Lossless)
- }
-
- /// Lossy encoding. 0 = low quality, small size; 100 = high quality, large size.
- ///
- /// Values are clamped from 0 to 100.
- pub fn lossy(quality: u8) -> Self {
- Self(Quality::Lossy(quality.clamp(Self::MIN, Self::MAX)))
- }
-}
-
-impl Default for WebPQuality {
- fn default() -> Self {
- Self::lossy(WebPQuality::DEFAULT)
- }
-}
-
-impl<W: Write> WebPEncoder<W> {
- /// Create a new encoder that writes its output to `w`.
- ///
- /// Defaults to lossy encoding, see [`WebPQuality::DEFAULT`].
- pub fn new(w: W) -> Self {
- WebPEncoder::new_with_quality(w, WebPQuality::default())
- }
-
- /// Create a new encoder with the specified quality, that writes its output to `w`.
- pub fn new_with_quality(w: W, quality: WebPQuality) -> Self {
- Self { inner: w, quality }
- }
-
- /// Encode image data with the indicated color type.
- ///
- /// The encoder requires image data be Rgb8 or Rgba8.
- pub fn encode(
- mut self,
- data: &[u8],
- width: u32,
- height: u32,
- color: ColorType,
- ) -> ImageResult<()> {
- // TODO: convert color types internally?
- let layout = match color {
- ColorType::Rgb8 => PixelLayout::Rgb,
- ColorType::Rgba8 => PixelLayout::Rgba,
- _ => {
- return Err(ImageError::Unsupported(
- UnsupportedError::from_format_and_kind(
- ImageFormat::WebP.into(),
- UnsupportedErrorKind::Color(color.into()),
- ),
- ))
- }
- };
-
- // Validate dimensions upfront to avoid panics.
- if width == 0
- || height == 0
- || !SampleLayout::row_major_packed(color.channel_count(), width, height)
- .fits(data.len())
- {
- return Err(ImageError::Parameter(ParameterError::from_kind(
- ParameterErrorKind::DimensionMismatch,
- )));
- }
-
- // Call the native libwebp library to encode the image.
- let encoder = Encoder::new(data, layout, width, height);
- let encoded: WebPMemory = match self.quality.0 {
- Quality::Lossless => encoder.encode_lossless(),
- Quality::Lossy(quality) => encoder.encode(quality as f32),
- };
-
- // The simple encoding API in libwebp does not return errors.
- if encoded.is_empty() {
- return Err(ImageError::Encoding(EncodingError::new(
- ImageFormat::WebP.into(),
- "encoding failed, output empty",
- )));
- }
-
- self.inner.write_all(&encoded)?;
- Ok(())
- }
-}
-
-impl<W: Write> ImageEncoder for WebPEncoder<W> {
- fn write_image(
- self,
- buf: &[u8],
- width: u32,
- height: u32,
- color_type: ColorType,
- ) -> ImageResult<()> {
- self.encode(buf, width, height, color_type)
- }
-}
-
-#[cfg(test)]
-mod tests {
- use crate::codecs::webp::{WebPEncoder, WebPQuality};
- use crate::{ColorType, ImageEncoder};
-
- #[test]
- fn webp_lossless_deterministic() {
- // 1x1 8-bit image buffer containing a single red pixel.
- let rgb: &[u8] = &[255, 0, 0];
- let rgba: &[u8] = &[255, 0, 0, 128];
- for (color, img, expected) in [
- (
- ColorType::Rgb8,
- rgb,
- [
- 82, 73, 70, 70, 28, 0, 0, 0, 87, 69, 66, 80, 86, 80, 56, 76, 15, 0, 0, 0, 47,
- 0, 0, 0, 0, 7, 16, 253, 143, 254, 7, 34, 162, 255, 1, 0,
- ],
- ),
- (
- ColorType::Rgba8,
- rgba,
- [
- 82, 73, 70, 70, 28, 0, 0, 0, 87, 69, 66, 80, 86, 80, 56, 76, 15, 0, 0, 0, 47,
- 0, 0, 0, 16, 7, 16, 253, 143, 2, 6, 34, 162, 255, 1, 0,
- ],
- ),
- ] {
- // Encode it into a memory buffer.
- let mut encoded_img = Vec::new();
- {
- let encoder =
- WebPEncoder::new_with_quality(&mut encoded_img, WebPQuality::lossless());
- encoder
- .write_image(&img, 1, 1, color)
- .expect("image encoding failed");
- }
-
- // WebP encoding should be deterministic.
- assert_eq!(encoded_img, expected);
- }
- }
-
- #[derive(Debug, Clone)]
- struct MockImage {
- width: u32,
- height: u32,
- color: ColorType,
- data: Vec<u8>,
- }
-
- impl quickcheck::Arbitrary for MockImage {
- fn arbitrary(g: &mut quickcheck::Gen) -> Self {
- // Limit to small, non-empty images <= 512x512.
- let width = u32::arbitrary(g) % 512 + 1;
- let height = u32::arbitrary(g) % 512 + 1;
- let (color, stride) = if bool::arbitrary(g) {
- (ColorType::Rgb8, 3)
- } else {
- (ColorType::Rgba8, 4)
- };
- let size = width * height * stride;
- let data: Vec<u8> = (0..size).map(|_| u8::arbitrary(g)).collect();
- MockImage {
- width,
- height,
- color,
- data,
- }
- }
- }
-
- quickcheck! {
- fn fuzz_webp_valid_image(image: MockImage, quality: u8) -> bool {
- // Check valid images do not panic.
- let mut buffer = Vec::<u8>::new();
- for webp_quality in [WebPQuality::lossless(), WebPQuality::lossy(quality)] {
- buffer.clear();
- let encoder = WebPEncoder::new_with_quality(&mut buffer, webp_quality);
- if !encoder
- .write_image(&image.data, image.width, image.height, image.color)
- .is_ok() {
- return false;
- }
- }
- true
- }
-
- fn fuzz_webp_no_panic(data: Vec<u8>, width: u8, height: u8, quality: u8) -> bool {
- // Check random (usually invalid) parameters do not panic.
- let mut buffer = Vec::<u8>::new();
- for color in [ColorType::Rgb8, ColorType::Rgba8] {
- for webp_quality in [WebPQuality::lossless(), WebPQuality::lossy(quality)] {
- buffer.clear();
- let encoder = WebPEncoder::new_with_quality(&mut buffer, webp_quality);
- // Ignore errors.
- let _ = encoder
- .write_image(&data, width as u32, height as u32, color);
- }
- }
- true
- }
- }
-}
diff --git a/vendor/image/src/codecs/webp/extended.rs b/vendor/image/src/codecs/webp/extended.rs
deleted file mode 100644
index 3dc6b34..0000000
--- a/vendor/image/src/codecs/webp/extended.rs
+++ /dev/null
@@ -1,839 +0,0 @@
-use std::convert::TryInto;
-use std::io::{self, Cursor, Error, Read};
-use std::{error, fmt};
-
-use super::decoder::{
- read_chunk, read_fourcc, read_len_cursor, DecoderError::ChunkHeaderInvalid, WebPRiffChunk,
-};
-use super::lossless::{LosslessDecoder, LosslessFrame};
-use super::vp8::{Frame as VP8Frame, Vp8Decoder};
-use crate::error::{DecodingError, ParameterError, ParameterErrorKind};
-use crate::image::ImageFormat;
-use crate::{
- ColorType, Delay, Frame, Frames, ImageError, ImageResult, Rgb, RgbImage, Rgba, RgbaImage,
-};
-use byteorder::{LittleEndian, ReadBytesExt};
-
-//all errors that can occur while parsing extended chunks in a WebP file
-#[derive(Debug, Clone, Copy)]
-enum DecoderError {
- // Some bits were invalid
- InfoBitsInvalid { name: &'static str, value: u32 },
- // Alpha chunk doesn't match the frame's size
- AlphaChunkSizeMismatch,
- // Image is too large, either for the platform's pointer size or generally
- ImageTooLarge,
- // Frame would go out of the canvas
- FrameOutsideImage,
-}
-
-impl fmt::Display for DecoderError {
- fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
- match self {
- DecoderError::InfoBitsInvalid { name, value } => f.write_fmt(format_args!(
- "Info bits `{}` invalid, received value: {}",
- name, value
- )),
- DecoderError::AlphaChunkSizeMismatch => {
- f.write_str("Alpha chunk doesn't match the size of the frame")
- }
- DecoderError::ImageTooLarge => f.write_str("Image is too large to be decoded"),
- DecoderError::FrameOutsideImage => {
- f.write_str("Frame is too large and would go outside the image")
- }
- }
- }
-}
-
-impl From<DecoderError> for ImageError {
- fn from(e: DecoderError) -> ImageError {
- ImageError::Decoding(DecodingError::new(ImageFormat::WebP.into(), e))
- }
-}
-
-impl error::Error for DecoderError {}
-
-#[derive(Debug, Clone)]
-pub(crate) struct WebPExtendedInfo {
- _icc_profile: bool,
- _alpha: bool,
- _exif_metadata: bool,
- _xmp_metadata: bool,
- _animation: bool,
- canvas_width: u32,
- canvas_height: u32,
- icc_profile: Option<Vec<u8>>,
-}
-
-#[derive(Debug)]
-enum ExtendedImageData {
- Animation {
- frames: Vec<AnimatedFrame>,
- anim_info: WebPAnimatedInfo,
- },
- Static(WebPStatic),
-}
-
-#[derive(Debug)]
-pub(crate) struct ExtendedImage {
- info: WebPExtendedInfo,
- image: ExtendedImageData,
-}
-
-impl ExtendedImage {
- pub(crate) fn dimensions(&self) -> (u32, u32) {
- (self.info.canvas_width, self.info.canvas_height)
- }
-
- pub(crate) fn has_animation(&self) -> bool {
- self.info._animation
- }
-
- pub(crate) fn icc_profile(&self) -> Option<Vec<u8>> {
- self.info.icc_profile.clone()
- }
-
- pub(crate) fn color_type(&self) -> ColorType {
- match &self.image {
- ExtendedImageData::Animation { frames, .. } => &frames[0].image,
- ExtendedImageData::Static(image) => image,
- }
- .color_type()
- }
-
- pub(crate) fn into_frames<'a>(self) -> Frames<'a> {
- struct FrameIterator {
- image: ExtendedImage,
- index: usize,
- canvas: RgbaImage,
- }
-
- impl Iterator for FrameIterator {
- type Item = ImageResult<Frame>;
-
- fn next(&mut self) -> Option<Self::Item> {
- if let ExtendedImageData::Animation { frames, anim_info } = &self.image.image {
- let frame = frames.get(self.index);
- match frame {
- Some(anim_image) => {
- self.index += 1;
- ExtendedImage::draw_subimage(
- &mut self.canvas,
- anim_image,
- anim_info.background_color,
- )
- }
- None => None,
- }
- } else {
- None
- }
- }
- }
-
- let width = self.info.canvas_width;
- let height = self.info.canvas_height;
- let background_color =
- if let ExtendedImageData::Animation { ref anim_info, .. } = self.image {
- anim_info.background_color
- } else {
- Rgba([0, 0, 0, 0])
- };
-
- let frame_iter = FrameIterator {
- image: self,
- index: 0,
- canvas: RgbaImage::from_pixel(width, height, background_color),
- };
-
- Frames::new(Box::new(frame_iter))
- }
-
- pub(crate) fn read_extended_chunks<R: Read>(
- reader: &mut R,
- mut info: WebPExtendedInfo,
- ) -> ImageResult<ExtendedImage> {
- let mut anim_info: Option<WebPAnimatedInfo> = None;
- let mut anim_frames: Vec<AnimatedFrame> = Vec::new();
- let mut static_frame: Option<WebPStatic> = None;
- //go until end of file and while chunk headers are valid
- while let Some((mut cursor, chunk)) = read_extended_chunk(reader)? {
- match chunk {
- WebPRiffChunk::EXIF | WebPRiffChunk::XMP => {
- //ignore these chunks
- }
- WebPRiffChunk::ANIM => {
- if anim_info.is_none() {
- anim_info = Some(Self::read_anim_info(&mut cursor)?);
- }
- }
- WebPRiffChunk::ANMF => {
- let frame = read_anim_frame(cursor, info.canvas_width, info.canvas_height)?;
- anim_frames.push(frame);
- }
- WebPRiffChunk::ALPH => {
- if static_frame.is_none() {
- let alpha_chunk =
- read_alpha_chunk(&mut cursor, info.canvas_width, info.canvas_height)?;
-
- let vp8_frame = read_lossy_with_chunk(reader)?;
-
- let img = WebPStatic::from_alpha_lossy(alpha_chunk, vp8_frame)?;
-
- static_frame = Some(img);
- }
- }
- WebPRiffChunk::ICCP => {
- let mut icc_profile = Vec::new();
- cursor.read_to_end(&mut icc_profile)?;
- info.icc_profile = Some(icc_profile);
- }
- WebPRiffChunk::VP8 => {
- if static_frame.is_none() {
- let vp8_frame = read_lossy(cursor)?;
-
- let img = WebPStatic::from_lossy(vp8_frame)?;
-
- static_frame = Some(img);
- }
- }
- WebPRiffChunk::VP8L => {
- if static_frame.is_none() {
- let mut lossless_decoder = LosslessDecoder::new(cursor);
- let frame = lossless_decoder.decode_frame()?;
- let image = WebPStatic::Lossless(frame.clone());
-
- static_frame = Some(image);
- }
- }
- _ => return Err(ChunkHeaderInvalid(chunk.to_fourcc()).into()),
- }
- }
-
- let image = if let Some(info) = anim_info {
- if anim_frames.is_empty() {
- return Err(ImageError::IoError(Error::from(
- io::ErrorKind::UnexpectedEof,
- )));
- }
- ExtendedImageData::Animation {
- frames: anim_frames,
- anim_info: info,
- }
- } else if let Some(frame) = static_frame {
- ExtendedImageData::Static(frame)
- } else {
- //reached end of file too early before image data was reached
- return Err(ImageError::IoError(Error::from(
- io::ErrorKind::UnexpectedEof,
- )));
- };
-
- let image = ExtendedImage { image, info };
-
- Ok(image)
- }
-
- fn read_anim_info<R: Read>(reader: &mut R) -> ImageResult<WebPAnimatedInfo> {
- let mut colors: [u8; 4] = [0; 4];
- reader.read_exact(&mut colors)?;
-
- //background color is [blue, green, red, alpha]
- let background_color = Rgba([colors[2], colors[1], colors[0], colors[3]]);
-
- let loop_count = reader.read_u16::<LittleEndian>()?;
-
- let info = WebPAnimatedInfo {
- background_color,
- _loop_count: loop_count,
- };
-
- Ok(info)
- }
-
- fn draw_subimage(
- canvas: &mut RgbaImage,
- anim_image: &AnimatedFrame,
- background_color: Rgba<u8>,
- ) -> Option<ImageResult<Frame>> {
- let mut buffer = vec![0; anim_image.image.get_buf_size()];
- anim_image.image.fill_buf(&mut buffer);
- let has_alpha = anim_image.image.has_alpha();
- let pixel_len: u32 = anim_image.image.color_type().bytes_per_pixel().into();
-
- 'x: for x in 0..anim_image.width {
- for y in 0..anim_image.height {
- let canvas_index: (u32, u32) = (x + anim_image.offset_x, y + anim_image.offset_y);
- // Negative offsets are not possible due to unsigned ints
- // If we go out of bounds by height, still continue by x
- if canvas_index.1 >= canvas.height() {
- continue 'x;
- }
- // If we go out of bounds by width, it doesn't make sense to continue at all
- if canvas_index.0 >= canvas.width() {
- break 'x;
- }
- let index: usize = ((y * anim_image.width + x) * pixel_len).try_into().unwrap();
- canvas[canvas_index] = if anim_image.use_alpha_blending && has_alpha {
- let buffer: [u8; 4] = buffer[index..][..4].try_into().unwrap();
- ExtendedImage::do_alpha_blending(buffer, canvas[canvas_index])
- } else {
- Rgba([
- buffer[index],
- buffer[index + 1],
- buffer[index + 2],
- if has_alpha { buffer[index + 3] } else { 255 },
- ])
- };
- }
- }
-
- let delay = Delay::from_numer_denom_ms(anim_image.duration, 1);
- let img = canvas.clone();
- let frame = Frame::from_parts(img, 0, 0, delay);
-
- if anim_image.dispose {
- for x in 0..anim_image.width {
- for y in 0..anim_image.height {
- let canvas_index = (x + anim_image.offset_x, y + anim_image.offset_y);
- canvas[canvas_index] = background_color;
- }
- }
- }
-
- Some(Ok(frame))
- }
-
- fn do_alpha_blending(buffer: [u8; 4], canvas: Rgba<u8>) -> Rgba<u8> {
- let canvas_alpha = f64::from(canvas[3]);
- let buffer_alpha = f64::from(buffer[3]);
- let blend_alpha_f64 = buffer_alpha + canvas_alpha * (1.0 - buffer_alpha / 255.0);
- //value should be between 0 and 255, this truncates the fractional part
- let blend_alpha: u8 = blend_alpha_f64 as u8;
-
- let blend_rgb: [u8; 3] = if blend_alpha == 0 {
- [0, 0, 0]
- } else {
- let mut rgb = [0u8; 3];
- for i in 0..3 {
- let canvas_f64 = f64::from(canvas[i]);
- let buffer_f64 = f64::from(buffer[i]);
-
- let val = (buffer_f64 * buffer_alpha
- + canvas_f64 * canvas_alpha * (1.0 - buffer_alpha / 255.0))
- / blend_alpha_f64;
- //value should be between 0 and 255, this truncates the fractional part
- rgb[i] = val as u8;
- }
-
- rgb
- };
-
- Rgba([blend_rgb[0], blend_rgb[1], blend_rgb[2], blend_alpha])
- }
-
- pub(crate) fn fill_buf(&self, buf: &mut [u8]) {
- match &self.image {
- // will always have at least one frame
- ExtendedImageData::Animation { frames, anim_info } => {
- let first_frame = &frames[0];
- let (canvas_width, canvas_height) = self.dimensions();
- if canvas_width == first_frame.width && canvas_height == first_frame.height {
- first_frame.image.fill_buf(buf);
- } else {
- let bg_color = match &self.info._alpha {
- true => Rgba::from([0, 0, 0, 0]),
- false => anim_info.background_color,
- };
- let mut canvas = RgbaImage::from_pixel(canvas_width, canvas_height, bg_color);
- let _ = ExtendedImage::draw_subimage(&mut canvas, first_frame, bg_color)
- .unwrap()
- .unwrap();
- buf.copy_from_slice(canvas.into_raw().as_slice());
- }
- }
- ExtendedImageData::Static(image) => {
- image.fill_buf(buf);
- }
- }
- }
-
- pub(crate) fn get_buf_size(&self) -> usize {
- match &self.image {
- // will always have at least one frame
- ExtendedImageData::Animation { frames, .. } => &frames[0].image,
- ExtendedImageData::Static(image) => image,
- }
- .get_buf_size()
- }
-
- pub(crate) fn set_background_color(&mut self, color: Rgba<u8>) -> ImageResult<()> {
- match &mut self.image {
- ExtendedImageData::Animation { anim_info, .. } => {
- anim_info.background_color = color;
- Ok(())
- }
- _ => Err(ImageError::Parameter(ParameterError::from_kind(
- ParameterErrorKind::Generic(
- "Background color can only be set on animated webp".to_owned(),
- ),
- ))),
- }
- }
-}
-
-#[derive(Debug)]
-enum WebPStatic {
- LossyWithAlpha(RgbaImage),
- LossyWithoutAlpha(RgbImage),
- Lossless(LosslessFrame),
-}
-
-impl WebPStatic {
- pub(crate) fn from_alpha_lossy(
- alpha: AlphaChunk,
- vp8_frame: VP8Frame,
- ) -> ImageResult<WebPStatic> {
- if alpha.data.len() != usize::from(vp8_frame.width) * usize::from(vp8_frame.height) {
- return Err(DecoderError::AlphaChunkSizeMismatch.into());
- }
-
- let size = usize::from(vp8_frame.width).checked_mul(usize::from(vp8_frame.height) * 4);
- let mut image_vec = match size {
- Some(size) => vec![0u8; size],
- None => return Err(DecoderError::ImageTooLarge.into()),
- };
-
- vp8_frame.fill_rgba(&mut image_vec);
-
- for y in 0..vp8_frame.height {
- for x in 0..vp8_frame.width {
- let predictor: u8 = WebPStatic::get_predictor(
- x.into(),
- y.into(),
- vp8_frame.width.into(),
- alpha.filtering_method,
- &image_vec,
- );
- let predictor = u16::from(predictor);
-
- let alpha_index = usize::from(y) * usize::from(vp8_frame.width) + usize::from(x);
- let alpha_val = alpha.data[alpha_index];
- let alpha: u8 = ((predictor + u16::from(alpha_val)) % 256)
- .try_into()
- .unwrap();
-
- let alpha_index = alpha_index * 4 + 3;
- image_vec[alpha_index] = alpha;
- }
- }
-
- let image = RgbaImage::from_vec(vp8_frame.width.into(), vp8_frame.height.into(), image_vec)
- .unwrap();
-
- Ok(WebPStatic::LossyWithAlpha(image))
- }
-
- fn get_predictor(
- x: usize,
- y: usize,
- width: usize,
- filtering_method: FilteringMethod,
- image_slice: &[u8],
- ) -> u8 {
- match filtering_method {
- FilteringMethod::None => 0,
- FilteringMethod::Horizontal => {
- if x == 0 && y == 0 {
- 0
- } else if x == 0 {
- let index = (y - 1) * width + x;
- image_slice[index * 4 + 3]
- } else {
- let index = y * width + x - 1;
- image_slice[index * 4 + 3]
- }
- }
- FilteringMethod::Vertical => {
- if x == 0 && y == 0 {
- 0
- } else if y == 0 {
- let index = y * width + x - 1;
- image_slice[index * 4 + 3]
- } else {
- let index = (y - 1) * width + x;
- image_slice[index * 4 + 3]
- }
- }
- FilteringMethod::Gradient => {
- let (left, top, top_left) = match (x, y) {
- (0, 0) => (0, 0, 0),
- (0, y) => {
- let above_index = (y - 1) * width + x;
- let val = image_slice[above_index * 4 + 3];
- (val, val, val)
- }
- (x, 0) => {
- let before_index = y * width + x - 1;
- let val = image_slice[before_index * 4 + 3];
- (val, val, val)
- }
- (x, y) => {
- let left_index = y * width + x - 1;
- let left = image_slice[left_index * 4 + 3];
- let top_index = (y - 1) * width + x;
- let top = image_slice[top_index * 4 + 3];
- let top_left_index = (y - 1) * width + x - 1;
- let top_left = image_slice[top_left_index * 4 + 3];
-
- (left, top, top_left)
- }
- };
-
- let combination = i16::from(left) + i16::from(top) - i16::from(top_left);
- i16::clamp(combination, 0, 255).try_into().unwrap()
- }
- }
- }
-
- pub(crate) fn from_lossy(vp8_frame: VP8Frame) -> ImageResult<WebPStatic> {
- let mut image = RgbImage::from_pixel(
- vp8_frame.width.into(),
- vp8_frame.height.into(),
- Rgb([0, 0, 0]),
- );
-
- vp8_frame.fill_rgb(&mut image);
-
- Ok(WebPStatic::LossyWithoutAlpha(image))
- }
-
- pub(crate) fn fill_buf(&self, buf: &mut [u8]) {
- match self {
- WebPStatic::LossyWithAlpha(image) => {
- buf.copy_from_slice(image);
- }
- WebPStatic::LossyWithoutAlpha(image) => {
- buf.copy_from_slice(image);
- }
- WebPStatic::Lossless(lossless) => {
- lossless.fill_rgba(buf);
- }
- }
- }
-
- pub(crate) fn get_buf_size(&self) -> usize {
- match self {
- WebPStatic::LossyWithAlpha(rgb_image) => rgb_image.len(),
- WebPStatic::LossyWithoutAlpha(rgba_image) => rgba_image.len(),
- WebPStatic::Lossless(lossless) => lossless.get_buf_size(),
- }
- }
-
- pub(crate) fn color_type(&self) -> ColorType {
- if self.has_alpha() {
- ColorType::Rgba8
- } else {
- ColorType::Rgb8
- }
- }
-
- pub(crate) fn has_alpha(&self) -> bool {
- match self {
- Self::LossyWithAlpha(..) | Self::Lossless(..) => true,
- Self::LossyWithoutAlpha(..) => false,
- }
- }
-}
-
-#[derive(Debug)]
-struct WebPAnimatedInfo {
- background_color: Rgba<u8>,
- _loop_count: u16,
-}
-
-#[derive(Debug)]
-struct AnimatedFrame {
- offset_x: u32,
- offset_y: u32,
- width: u32,
- height: u32,
- duration: u32,
- use_alpha_blending: bool,
- dispose: bool,
- image: WebPStatic,
-}
-
-/// Reads a chunk, but silently ignores unknown chunks at the end of a file
-fn read_extended_chunk<R>(r: &mut R) -> ImageResult<Option<(Cursor<Vec<u8>>, WebPRiffChunk)>>
-where
- R: Read,
-{
- let mut unknown_chunk = Ok(());
-
- while let Some(chunk) = read_fourcc(r)? {
- let cursor = read_len_cursor(r)?;
- match chunk {
- Ok(chunk) => return unknown_chunk.and(Ok(Some((cursor, chunk)))),
- Err(err) => unknown_chunk = unknown_chunk.and(Err(err)),
- }
- }
-
- Ok(None)
-}
-
-pub(crate) fn read_extended_header<R: Read>(reader: &mut R) -> ImageResult<WebPExtendedInfo> {
- let chunk_flags = reader.read_u8()?;
-
- let reserved_first = chunk_flags & 0b11000000;
- let icc_profile = chunk_flags & 0b00100000 != 0;
- let alpha = chunk_flags & 0b00010000 != 0;
- let exif_metadata = chunk_flags & 0b00001000 != 0;
- let xmp_metadata = chunk_flags & 0b00000100 != 0;
- let animation = chunk_flags & 0b00000010 != 0;
- let reserved_second = chunk_flags & 0b00000001;
-
- let reserved_third = read_3_bytes(reader)?;
-
- if reserved_first != 0 || reserved_second != 0 || reserved_third != 0 {
- let value: u32 = if reserved_first != 0 {
- reserved_first.into()
- } else if reserved_second != 0 {
- reserved_second.into()
- } else {
- reserved_third
- };
- return Err(DecoderError::InfoBitsInvalid {
- name: "reserved",
- value,
- }
- .into());
- }
-
- let canvas_width = read_3_bytes(reader)? + 1;
- let canvas_height = read_3_bytes(reader)? + 1;
-
- //product of canvas dimensions cannot be larger than u32 max
- if u32::checked_mul(canvas_width, canvas_height).is_none() {
- return Err(DecoderError::ImageTooLarge.into());
- }
-
- let info = WebPExtendedInfo {
- _icc_profile: icc_profile,
- _alpha: alpha,
- _exif_metadata: exif_metadata,
- _xmp_metadata: xmp_metadata,
- _animation: animation,
- canvas_width,
- canvas_height,
- icc_profile: None,
- };
-
- Ok(info)
-}
-
-fn read_anim_frame<R: Read>(
- mut reader: R,
- canvas_width: u32,
- canvas_height: u32,
-) -> ImageResult<AnimatedFrame> {
- //offsets for the frames are twice the values
- let frame_x = read_3_bytes(&mut reader)? * 2;
- let frame_y = read_3_bytes(&mut reader)? * 2;
-
- let frame_width = read_3_bytes(&mut reader)? + 1;
- let frame_height = read_3_bytes(&mut reader)? + 1;
-
- if frame_x + frame_width > canvas_width || frame_y + frame_height > canvas_height {
- return Err(DecoderError::FrameOutsideImage.into());
- }
-
- let duration = read_3_bytes(&mut reader)?;
-
- let frame_info = reader.read_u8()?;
- let reserved = frame_info & 0b11111100;
- if reserved != 0 {
- return Err(DecoderError::InfoBitsInvalid {
- name: "reserved",
- value: reserved.into(),
- }
- .into());
- }
- let use_alpha_blending = frame_info & 0b00000010 == 0;
- let dispose = frame_info & 0b00000001 != 0;
-
- //read normal bitstream now
- let static_image = read_image(&mut reader, frame_width, frame_height)?;
-
- let frame = AnimatedFrame {
- offset_x: frame_x,
- offset_y: frame_y,
- width: frame_width,
- height: frame_height,
- duration,
- use_alpha_blending,
- dispose,
- image: static_image,
- };
-
- Ok(frame)
-}
-
-fn read_3_bytes<R: Read>(reader: &mut R) -> ImageResult<u32> {
- let mut buffer: [u8; 3] = [0; 3];
- reader.read_exact(&mut buffer)?;
- let value: u32 =
- (u32::from(buffer[2]) << 16) | (u32::from(buffer[1]) << 8) | u32::from(buffer[0]);
- Ok(value)
-}
-
-fn read_lossy_with_chunk<R: Read>(reader: &mut R) -> ImageResult<VP8Frame> {
- let (cursor, chunk) =
- read_chunk(reader)?.ok_or_else(|| Error::from(io::ErrorKind::UnexpectedEof))?;
-
- if chunk != WebPRiffChunk::VP8 {
- return Err(ChunkHeaderInvalid(chunk.to_fourcc()).into());
- }
-
- read_lossy(cursor)
-}
-
-fn read_lossy(cursor: Cursor<Vec<u8>>) -> ImageResult<VP8Frame> {
- let mut vp8_decoder = Vp8Decoder::new(cursor);
- let frame = vp8_decoder.decode_frame()?;
-
- Ok(frame.clone())
-}
-
-fn read_image<R: Read>(reader: &mut R, width: u32, height: u32) -> ImageResult<WebPStatic> {
- let chunk = read_chunk(reader)?;
-
- match chunk {
- Some((cursor, WebPRiffChunk::VP8)) => {
- let mut vp8_decoder = Vp8Decoder::new(cursor);
- let frame = vp8_decoder.decode_frame()?;
-
- let img = WebPStatic::from_lossy(frame.clone())?;
-
- Ok(img)
- }
- Some((cursor, WebPRiffChunk::VP8L)) => {
- let mut lossless_decoder = LosslessDecoder::new(cursor);
- let frame = lossless_decoder.decode_frame()?;
-
- let img = WebPStatic::Lossless(frame.clone());
-
- Ok(img)
- }
- Some((mut cursor, WebPRiffChunk::ALPH)) => {
- let alpha_chunk = read_alpha_chunk(&mut cursor, width, height)?;
-
- let vp8_frame = read_lossy_with_chunk(reader)?;
-
- let img = WebPStatic::from_alpha_lossy(alpha_chunk, vp8_frame)?;
-
- Ok(img)
- }
- None => Err(ImageError::IoError(Error::from(
- io::ErrorKind::UnexpectedEof,
- ))),
- Some((_, chunk)) => Err(ChunkHeaderInvalid(chunk.to_fourcc()).into()),
- }
-}
-
-#[derive(Debug)]
-struct AlphaChunk {
- _preprocessing: bool,
- filtering_method: FilteringMethod,
- data: Vec<u8>,
-}
-
-#[derive(Debug, Copy, Clone)]
-enum FilteringMethod {
- None,
- Horizontal,
- Vertical,
- Gradient,
-}
-
-fn read_alpha_chunk<R: Read>(reader: &mut R, width: u32, height: u32) -> ImageResult<AlphaChunk> {
- let info_byte = reader.read_u8()?;
-
- let reserved = info_byte & 0b11000000;
- let preprocessing = (info_byte & 0b00110000) >> 4;
- let filtering = (info_byte & 0b00001100) >> 2;
- let compression = info_byte & 0b00000011;
-
- if reserved != 0 {
- return Err(DecoderError::InfoBitsInvalid {
- name: "reserved",
- value: reserved.into(),
- }
- .into());
- }
-
- let preprocessing = match preprocessing {
- 0 => false,
- 1 => true,
- _ => {
- return Err(DecoderError::InfoBitsInvalid {
- name: "reserved",
- value: preprocessing.into(),
- }
- .into())
- }
- };
-
- let filtering_method = match filtering {
- 0 => FilteringMethod::None,
- 1 => FilteringMethod::Horizontal,
- 2 => FilteringMethod::Vertical,
- 3 => FilteringMethod::Gradient,
- _ => unreachable!(),
- };
-
- let lossless_compression = match compression {
- 0 => false,
- 1 => true,
- _ => {
- return Err(DecoderError::InfoBitsInvalid {
- name: "lossless compression",
- value: compression.into(),
- }
- .into())
- }
- };
-
- let mut framedata = Vec::new();
- reader.read_to_end(&mut framedata)?;
-
- let data = if lossless_compression {
- let cursor = io::Cursor::new(framedata);
-
- let mut decoder = LosslessDecoder::new(cursor);
- //this is a potential problem for large images; would require rewriting lossless decoder to use u32 for width and height
- let width: u16 = width
- .try_into()
- .map_err(|_| ImageError::from(DecoderError::ImageTooLarge))?;
- let height: u16 = height
- .try_into()
- .map_err(|_| ImageError::from(DecoderError::ImageTooLarge))?;
- let frame = decoder.decode_frame_implicit_dims(width, height)?;
-
- let mut data = vec![0u8; usize::from(width) * usize::from(height)];
-
- frame.fill_green(&mut data);
-
- data
- } else {
- framedata
- };
-
- let chunk = AlphaChunk {
- _preprocessing: preprocessing,
- filtering_method,
- data,
- };
-
- Ok(chunk)
-}
diff --git a/vendor/image/src/codecs/webp/huffman.rs b/vendor/image/src/codecs/webp/huffman.rs
deleted file mode 100644
index 986eee6..0000000
--- a/vendor/image/src/codecs/webp/huffman.rs
+++ /dev/null
@@ -1,202 +0,0 @@
-use std::convert::TryInto;
-
-use super::lossless::BitReader;
-use super::lossless::DecoderError;
-use crate::ImageResult;
-
-/// Rudimentary utility for reading Canonical Huffman Codes.
-/// Based off https://github.com/webmproject/libwebp/blob/7f8472a610b61ec780ef0a8873cd954ac512a505/src/utils/huffman.c
-///
-
-const MAX_ALLOWED_CODE_LENGTH: usize = 15;
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-enum HuffmanTreeNode {
- Branch(usize), //offset in vector to children
- Leaf(u16), //symbol stored in leaf
- Empty,
-}
-
-/// Huffman tree
-#[derive(Clone, Debug, Default)]
-pub(crate) struct HuffmanTree {
- tree: Vec<HuffmanTreeNode>,
- max_nodes: usize,
- num_nodes: usize,
-}
-
-impl HuffmanTree {
- fn is_full(&self) -> bool {
- self.num_nodes == self.max_nodes
- }
-
- /// Turns a node from empty into a branch and assigns its children
- fn assign_children(&mut self, node_index: usize) -> usize {
- let offset_index = self.num_nodes - node_index;
- self.tree[node_index] = HuffmanTreeNode::Branch(offset_index);
- self.num_nodes += 2;
-
- offset_index
- }
-
- /// Init a huffman tree
- fn init(num_leaves: usize) -> ImageResult<HuffmanTree> {
- if num_leaves == 0 {
- return Err(DecoderError::HuffmanError.into());
- }
-
- let max_nodes = 2 * num_leaves - 1;
- let tree = vec![HuffmanTreeNode::Empty; max_nodes];
- let num_nodes = 1;
-
- let tree = HuffmanTree {
- tree,
- max_nodes,
- num_nodes,
- };
-
- Ok(tree)
- }
-
- /// Converts code lengths to codes
- fn code_lengths_to_codes(code_lengths: &[u16]) -> ImageResult<Vec<Option<u16>>> {
- let max_code_length = *code_lengths
- .iter()
- .reduce(|a, b| if a >= b { a } else { b })
- .unwrap();
-
- if max_code_length > MAX_ALLOWED_CODE_LENGTH.try_into().unwrap() {
- return Err(DecoderError::HuffmanError.into());
- }
-
- let mut code_length_hist = vec![0; MAX_ALLOWED_CODE_LENGTH + 1];
-
- for &length in code_lengths.iter() {
- code_length_hist[usize::from(length)] += 1;
- }
-
- code_length_hist[0] = 0;
-
- let mut curr_code = 0;
- let mut next_codes = vec![None; MAX_ALLOWED_CODE_LENGTH + 1];
-
- for code_len in 1..=usize::from(max_code_length) {
- curr_code = (curr_code + code_length_hist[code_len - 1]) << 1;
- next_codes[code_len] = Some(curr_code);
- }
-
- let mut huff_codes = vec![None; code_lengths.len()];
-
- for (symbol, &length) in code_lengths.iter().enumerate() {
- let length = usize::from(length);
- if length > 0 {
- huff_codes[symbol] = next_codes[length];
- if let Some(value) = next_codes[length].as_mut() {
- *value += 1;
- }
- } else {
- huff_codes[symbol] = None;
- }
- }
-
- Ok(huff_codes)
- }
-
- /// Adds a symbol to a huffman tree
- fn add_symbol(&mut self, symbol: u16, code: u16, code_length: u16) -> ImageResult<()> {
- let mut node_index = 0;
- let code = usize::from(code);
-
- for length in (0..code_length).rev() {
- if node_index >= self.max_nodes {
- return Err(DecoderError::HuffmanError.into());
- }
-
- let node = self.tree[node_index];
-
- let offset = match node {
- HuffmanTreeNode::Empty => {
- if self.is_full() {
- return Err(DecoderError::HuffmanError.into());
- }
- self.assign_children(node_index)
- }
- HuffmanTreeNode::Leaf(_) => return Err(DecoderError::HuffmanError.into()),
- HuffmanTreeNode::Branch(offset) => offset,
- };
-
- node_index += offset + ((code >> length) & 1);
- }
-
- match self.tree[node_index] {
- HuffmanTreeNode::Empty => self.tree[node_index] = HuffmanTreeNode::Leaf(symbol),
- HuffmanTreeNode::Leaf(_) => return Err(DecoderError::HuffmanError.into()),
- HuffmanTreeNode::Branch(_offset) => return Err(DecoderError::HuffmanError.into()),
- }
-
- Ok(())
- }
-
- /// Builds a tree implicitly, just from code lengths
- pub(crate) fn build_implicit(code_lengths: Vec<u16>) -> ImageResult<HuffmanTree> {
- let mut num_symbols = 0;
- let mut root_symbol = 0;
-
- for (symbol, length) in code_lengths.iter().enumerate() {
- if *length > 0 {
- num_symbols += 1;
- root_symbol = symbol.try_into().unwrap();
- }
- }
-
- let mut tree = HuffmanTree::init(num_symbols)?;
-
- if num_symbols == 1 {
- tree.add_symbol(root_symbol, 0, 0)?;
- } else {
- let codes = HuffmanTree::code_lengths_to_codes(&code_lengths)?;
-
- for (symbol, &length) in code_lengths.iter().enumerate() {
- if length > 0 && codes[symbol].is_some() {
- tree.add_symbol(symbol.try_into().unwrap(), codes[symbol].unwrap(), length)?;
- }
- }
- }
-
- Ok(tree)
- }
-
- /// Builds a tree explicitly from lengths, codes and symbols
- pub(crate) fn build_explicit(
- code_lengths: Vec<u16>,
- codes: Vec<u16>,
- symbols: Vec<u16>,
- ) -> ImageResult<HuffmanTree> {
- let mut tree = HuffmanTree::init(symbols.len())?;
-
- for i in 0..symbols.len() {
- tree.add_symbol(symbols[i], codes[i], code_lengths[i])?;
- }
-
- Ok(tree)
- }
-
- /// Reads a symbol using the bitstream
- pub(crate) fn read_symbol(&self, bit_reader: &mut BitReader) -> ImageResult<u16> {
- let mut index = 0;
- let mut node = self.tree[index];
-
- while let HuffmanTreeNode::Branch(children_offset) = node {
- index += children_offset + bit_reader.read_bits::<usize>(1)?;
- node = self.tree[index];
- }
-
- let symbol = match node {
- HuffmanTreeNode::Branch(_) => unreachable!(),
- HuffmanTreeNode::Empty => return Err(DecoderError::HuffmanError.into()),
- HuffmanTreeNode::Leaf(symbol) => symbol,
- };
-
- Ok(symbol)
- }
-}
diff --git a/vendor/image/src/codecs/webp/loop_filter.rs b/vendor/image/src/codecs/webp/loop_filter.rs
deleted file mode 100644
index 312059f..0000000
--- a/vendor/image/src/codecs/webp/loop_filter.rs
+++ /dev/null
@@ -1,147 +0,0 @@
-//! Does loop filtering on webp lossy images
-
-use crate::utils::clamp;
-
-#[inline]
-fn c(val: i32) -> i32 {
- clamp(val, -128, 127)
-}
-
-//unsigned to signed
-#[inline]
-fn u2s(val: u8) -> i32 {
- i32::from(val) - 128
-}
-
-//signed to unsigned
-#[inline]
-fn s2u(val: i32) -> u8 {
- (c(val) + 128) as u8
-}
-
-#[inline]
-fn diff(val1: u8, val2: u8) -> u8 {
- if val1 > val2 {
- val1 - val2
- } else {
- val2 - val1
- }
-}
-
-//15.2
-fn common_adjust(use_outer_taps: bool, pixels: &mut [u8], point: usize, stride: usize) -> i32 {
- let p1 = u2s(pixels[point - 2 * stride]);
- let p0 = u2s(pixels[point - stride]);
- let q0 = u2s(pixels[point]);
- let q1 = u2s(pixels[point + stride]);
-
- //value for the outer 2 pixels
- let outer = if use_outer_taps { c(p1 - q1) } else { 0 };
-
- let mut a = c(outer + 3 * (q0 - p0));
-
- let b = (c(a + 3)) >> 3;
-
- a = (c(a + 4)) >> 3;
-
- pixels[point] = s2u(q0 - a);
- pixels[point - stride] = s2u(p0 + b);
-
- a
-}
-
-fn simple_threshold(filter_limit: i32, pixels: &[u8], point: usize, stride: usize) -> bool {
- i32::from(diff(pixels[point - stride], pixels[point])) * 2
- + i32::from(diff(pixels[point - 2 * stride], pixels[point + stride])) / 2
- <= filter_limit
-}
-
-fn should_filter(
- interior_limit: u8,
- edge_limit: u8,
- pixels: &[u8],
- point: usize,
- stride: usize,
-) -> bool {
- simple_threshold(i32::from(edge_limit), pixels, point, stride)
- && diff(pixels[point - 4 * stride], pixels[point - 3 * stride]) <= interior_limit
- && diff(pixels[point - 3 * stride], pixels[point - 2 * stride]) <= interior_limit
- && diff(pixels[point - 2 * stride], pixels[point - stride]) <= interior_limit
- && diff(pixels[point + 3 * stride], pixels[point + 2 * stride]) <= interior_limit
- && diff(pixels[point + 2 * stride], pixels[point + stride]) <= interior_limit
- && diff(pixels[point + stride], pixels[point]) <= interior_limit
-}
-
-fn high_edge_variance(threshold: u8, pixels: &[u8], point: usize, stride: usize) -> bool {
- diff(pixels[point - 2 * stride], pixels[point - stride]) > threshold
- || diff(pixels[point + stride], pixels[point]) > threshold
-}
-
-//simple filter
-//effects 4 pixels on an edge(2 each side)
-pub(crate) fn simple_segment(edge_limit: u8, pixels: &mut [u8], point: usize, stride: usize) {
- if simple_threshold(i32::from(edge_limit), pixels, point, stride) {
- common_adjust(true, pixels, point, stride);
- }
-}
-
-//normal filter
-//works on the 8 pixels on the edges between subblocks inside a macroblock
-pub(crate) fn subblock_filter(
- hev_threshold: u8,
- interior_limit: u8,
- edge_limit: u8,
- pixels: &mut [u8],
- point: usize,
- stride: usize,
-) {
- if should_filter(interior_limit, edge_limit, pixels, point, stride) {
- let hv = high_edge_variance(hev_threshold, pixels, point, stride);
-
- let a = (common_adjust(hv, pixels, point, stride) + 1) >> 1;
-
- if !hv {
- pixels[point + stride] = s2u(u2s(pixels[point + stride]) - a);
- pixels[point - 2 * stride] = s2u(u2s(pixels[point - 2 * stride]) - a);
- }
- }
-}
-
-//normal filter
-//works on the 8 pixels on the edges between macroblocks
-pub(crate) fn macroblock_filter(
- hev_threshold: u8,
- interior_limit: u8,
- edge_limit: u8,
- pixels: &mut [u8],
- point: usize,
- stride: usize,
-) {
- let mut spixels = [0i32; 8];
- for i in 0..8 {
- spixels[i] = u2s(pixels[point + i * stride - 4 * stride]);
- }
-
- if should_filter(interior_limit, edge_limit, pixels, point, stride) {
- if !high_edge_variance(hev_threshold, pixels, point, stride) {
- let w = c(c(spixels[2] - spixels[5]) + 3 * (spixels[4] - spixels[3]));
-
- let mut a = c((27 * w + 63) >> 7);
-
- pixels[point] = s2u(spixels[4] - a);
- pixels[point - stride] = s2u(spixels[3] + a);
-
- a = c((18 * w + 63) >> 7);
-
- pixels[point + stride] = s2u(spixels[5] - a);
- pixels[point - 2 * stride] = s2u(spixels[2] + a);
-
- a = c((9 * w + 63) >> 7);
-
- pixels[point + 2 * stride] = s2u(spixels[6] - a);
- pixels[point - 3 * stride] = s2u(spixels[1] + a);
- } else {
- common_adjust(true, pixels, point, stride);
- }
- }
-}
diff --git a/vendor/image/src/codecs/webp/lossless.rs b/vendor/image/src/codecs/webp/lossless.rs
deleted file mode 100644
index 7271eda..0000000
--- a/vendor/image/src/codecs/webp/lossless.rs
+++ /dev/null
@@ -1,783 +0,0 @@
-//! Decoding of lossless WebP images
-//!
-//! [Lossless spec](https://developers.google.com/speed/webp/docs/webp_lossless_bitstream_specification)
-//!
-
-use std::{
- convert::TryFrom,
- convert::TryInto,
- error, fmt,
- io::Read,
- ops::{AddAssign, Shl},
-};
-
-use byteorder::ReadBytesExt;
-
-use crate::{error::DecodingError, ImageError, ImageFormat, ImageResult};
-
-use super::huffman::HuffmanTree;
-use super::lossless_transform::{add_pixels, TransformType};
-
-const CODE_LENGTH_CODES: usize = 19;
-const CODE_LENGTH_CODE_ORDER: [usize; CODE_LENGTH_CODES] = [
- 17, 18, 0, 1, 2, 3, 4, 5, 16, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-];
-
-#[rustfmt::skip]
-const DISTANCE_MAP: [(i8, i8); 120] = [
- (0, 1), (1, 0), (1, 1), (-1, 1), (0, 2), (2, 0), (1, 2), (-1, 2),
- (2, 1), (-2, 1), (2, 2), (-2, 2), (0, 3), (3, 0), (1, 3), (-1, 3),
- (3, 1), (-3, 1), (2, 3), (-2, 3), (3, 2), (-3, 2), (0, 4), (4, 0),
- (1, 4), (-1, 4), (4, 1), (-4, 1), (3, 3), (-3, 3), (2, 4), (-2, 4),
- (4, 2), (-4, 2), (0, 5), (3, 4), (-3, 4), (4, 3), (-4, 3), (5, 0),
- (1, 5), (-1, 5), (5, 1), (-5, 1), (2, 5), (-2, 5), (5, 2), (-5, 2),
- (4, 4), (-4, 4), (3, 5), (-3, 5), (5, 3), (-5, 3), (0, 6), (6, 0),
- (1, 6), (-1, 6), (6, 1), (-6, 1), (2, 6), (-2, 6), (6, 2), (-6, 2),
- (4, 5), (-4, 5), (5, 4), (-5, 4), (3, 6), (-3, 6), (6, 3), (-6, 3),
- (0, 7), (7, 0), (1, 7), (-1, 7), (5, 5), (-5, 5), (7, 1), (-7, 1),
- (4, 6), (-4, 6), (6, 4), (-6, 4), (2, 7), (-2, 7), (7, 2), (-7, 2),
- (3, 7), (-3, 7), (7, 3), (-7, 3), (5, 6), (-5, 6), (6, 5), (-6, 5),
- (8, 0), (4, 7), (-4, 7), (7, 4), (-7, 4), (8, 1), (8, 2), (6, 6),
- (-6, 6), (8, 3), (5, 7), (-5, 7), (7, 5), (-7, 5), (8, 4), (6, 7),
- (-6, 7), (7, 6), (-7, 6), (8, 5), (7, 7), (-7, 7), (8, 6), (8, 7)
-];
-
-const GREEN: usize = 0;
-const RED: usize = 1;
-const BLUE: usize = 2;
-const ALPHA: usize = 3;
-const DIST: usize = 4;
-
-const HUFFMAN_CODES_PER_META_CODE: usize = 5;
-
-type HuffmanCodeGroup = [HuffmanTree; HUFFMAN_CODES_PER_META_CODE];
-
-const ALPHABET_SIZE: [u16; HUFFMAN_CODES_PER_META_CODE] = [256 + 24, 256, 256, 256, 40];
-
-#[inline]
-pub(crate) fn subsample_size(size: u16, bits: u8) -> u16 {
- ((u32::from(size) + (1u32 << bits) - 1) >> bits)
- .try_into()
- .unwrap()
-}
-
-#[derive(Debug, Clone, Copy)]
-pub(crate) enum DecoderError {
- /// Signature of 0x2f not found
- LosslessSignatureInvalid(u8),
- /// Version Number must be 0
- VersionNumberInvalid(u8),
-
- ///
- InvalidColorCacheBits(u8),
-
- HuffmanError,
-
- BitStreamError,
-
- TransformError,
-}
-
-impl fmt::Display for DecoderError {
- fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
- match self {
- DecoderError::LosslessSignatureInvalid(sig) => {
- f.write_fmt(format_args!("Invalid lossless signature: {}", sig))
- }
- DecoderError::VersionNumberInvalid(num) => {
- f.write_fmt(format_args!("Invalid version number: {}", num))
- }
- DecoderError::InvalidColorCacheBits(num) => f.write_fmt(format_args!(
- "Invalid color cache(must be between 1-11): {}",
- num
- )),
- DecoderError::HuffmanError => f.write_fmt(format_args!("Error building Huffman Tree")),
- DecoderError::BitStreamError => {
- f.write_fmt(format_args!("Error while reading bitstream"))
- }
- DecoderError::TransformError => {
- f.write_fmt(format_args!("Error while reading or writing transforms"))
- }
- }
- }
-}
-
-impl From<DecoderError> for ImageError {
- fn from(e: DecoderError) -> ImageError {
- ImageError::Decoding(DecodingError::new(ImageFormat::WebP.into(), e))
- }
-}
-
-impl error::Error for DecoderError {}
-
-const NUM_TRANSFORM_TYPES: usize = 4;
-
-//Decodes lossless WebP images
-#[derive(Debug)]
-pub(crate) struct LosslessDecoder<R> {
- r: R,
- bit_reader: BitReader,
- frame: LosslessFrame,
- transforms: [Option<TransformType>; NUM_TRANSFORM_TYPES],
- transform_order: Vec<u8>,
-}
-
-impl<R: Read> LosslessDecoder<R> {
- /// Create a new decoder
- pub(crate) fn new(r: R) -> LosslessDecoder<R> {
- LosslessDecoder {
- r,
- bit_reader: BitReader::new(),
- frame: Default::default(),
- transforms: [None, None, None, None],
- transform_order: Vec::new(),
- }
- }
-
- /// Reads the frame
- pub(crate) fn decode_frame(&mut self) -> ImageResult<&LosslessFrame> {
- let signature = self.r.read_u8()?;
-
- if signature != 0x2f {
- return Err(DecoderError::LosslessSignatureInvalid(signature).into());
- }
-
- let mut buf = Vec::new();
- self.r.read_to_end(&mut buf)?;
- self.bit_reader.init(buf);
-
- self.frame.width = self.bit_reader.read_bits::<u16>(14)? + 1;
- self.frame.height = self.bit_reader.read_bits::<u16>(14)? + 1;
-
- let _alpha_used = self.bit_reader.read_bits::<u8>(1)?;
-
- let version_num = self.bit_reader.read_bits::<u8>(3)?;
-
- if version_num != 0 {
- return Err(DecoderError::VersionNumberInvalid(version_num).into());
- }
-
- let mut data = self.decode_image_stream(self.frame.width, self.frame.height, true)?;
-
- for &trans_index in self.transform_order.iter().rev() {
- let trans = self.transforms[usize::from(trans_index)].as_ref().unwrap();
- trans.apply_transform(&mut data, self.frame.width, self.frame.height)?;
- }
-
- self.frame.buf = data;
- Ok(&self.frame)
- }
-
- //used for alpha data in extended decoding
- pub(crate) fn decode_frame_implicit_dims(
- &mut self,
- width: u16,
- height: u16,
- ) -> ImageResult<&LosslessFrame> {
- let mut buf = Vec::new();
- self.r.read_to_end(&mut buf)?;
- self.bit_reader.init(buf);
-
- self.frame.width = width;
- self.frame.height = height;
-
- let mut data = self.decode_image_stream(self.frame.width, self.frame.height, true)?;
-
- //transform_order is vector of indices(0-3) into transforms in order decoded
- for &trans_index in self.transform_order.iter().rev() {
- let trans = self.transforms[usize::from(trans_index)].as_ref().unwrap();
- trans.apply_transform(&mut data, self.frame.width, self.frame.height)?;
- }
-
- self.frame.buf = data;
- Ok(&self.frame)
- }
-
- /// Reads Image data from the bitstream
- /// Can be in any of the 5 roles described in the Specification
- /// ARGB Image role has different behaviour to the other 4
- /// xsize and ysize describe the size of the blocks where each block has its own entropy code
- fn decode_image_stream(
- &mut self,
- xsize: u16,
- ysize: u16,
- is_argb_img: bool,
- ) -> ImageResult<Vec<u32>> {
- let trans_xsize = if is_argb_img {
- self.read_transforms()?
- } else {
- xsize
- };
-
- let color_cache_bits = self.read_color_cache()?;
-
- let color_cache = color_cache_bits.map(|bits| {
- let size = 1 << bits;
- let cache = vec![0u32; size];
- ColorCache {
- color_cache_bits: bits,
- color_cache: cache,
- }
- });
-
- let huffman_info = self.read_huffman_codes(is_argb_img, trans_xsize, ysize, color_cache)?;
-
- //decode data
- let data = self.decode_image_data(trans_xsize, ysize, huffman_info)?;
-
- Ok(data)
- }
-
- /// Reads transforms and their data from the bitstream
- fn read_transforms(&mut self) -> ImageResult<u16> {
- let mut xsize = self.frame.width;
-
- while self.bit_reader.read_bits::<u8>(1)? == 1 {
- let transform_type_val = self.bit_reader.read_bits::<u8>(2)?;
-
- if self.transforms[usize::from(transform_type_val)].is_some() {
- //can only have one of each transform, error
- return Err(DecoderError::TransformError.into());
- }
-
- self.transform_order.push(transform_type_val);
-
- let transform_type = match transform_type_val {
- 0 => {
- //predictor
-
- let size_bits = self.bit_reader.read_bits::<u8>(3)? + 2;
-
- let block_xsize = subsample_size(xsize, size_bits);
- let block_ysize = subsample_size(self.frame.height, size_bits);
-
- let data = self.decode_image_stream(block_xsize, block_ysize, false)?;
-
- TransformType::PredictorTransform {
- size_bits,
- predictor_data: data,
- }
- }
- 1 => {
- //color transform
-
- let size_bits = self.bit_reader.read_bits::<u8>(3)? + 2;
-
- let block_xsize = subsample_size(xsize, size_bits);
- let block_ysize = subsample_size(self.frame.height, size_bits);
-
- let data = self.decode_image_stream(block_xsize, block_ysize, false)?;
-
- TransformType::ColorTransform {
- size_bits,
- transform_data: data,
- }
- }
- 2 => {
- //subtract green
-
- TransformType::SubtractGreen
- }
- 3 => {
- let color_table_size = self.bit_reader.read_bits::<u16>(8)? + 1;
-
- let mut color_map = self.decode_image_stream(color_table_size, 1, false)?;
-
- let bits = if color_table_size <= 2 {
- 3
- } else if color_table_size <= 4 {
- 2
- } else if color_table_size <= 16 {
- 1
- } else {
- 0
- };
- xsize = subsample_size(xsize, bits);
-
- Self::adjust_color_map(&mut color_map);
-
- TransformType::ColorIndexingTransform {
- table_size: color_table_size,
- table_data: color_map,
- }
- }
- _ => unreachable!(),
- };
-
- self.transforms[usize::from(transform_type_val)] = Some(transform_type);
- }
-
- Ok(xsize)
- }
-
- /// Adjusts the color map since it's subtraction coded
- fn adjust_color_map(color_map: &mut Vec<u32>) {
- for i in 1..color_map.len() {
- color_map[i] = add_pixels(color_map[i], color_map[i - 1]);
- }
- }
-
- /// Reads huffman codes associated with an image
- fn read_huffman_codes(
- &mut self,
- read_meta: bool,
- xsize: u16,
- ysize: u16,
- color_cache: Option<ColorCache>,
- ) -> ImageResult<HuffmanInfo> {
- let mut num_huff_groups = 1;
-
- let mut huffman_bits = 0;
- let mut huffman_xsize = 1;
- let mut huffman_ysize = 1;
- let mut entropy_image = Vec::new();
-
- if read_meta && self.bit_reader.read_bits::<u8>(1)? == 1 {
- //meta huffman codes
- huffman_bits = self.bit_reader.read_bits::<u8>(3)? + 2;
- huffman_xsize = subsample_size(xsize, huffman_bits);
- huffman_ysize = subsample_size(ysize, huffman_bits);
-
- entropy_image = self.decode_image_stream(huffman_xsize, huffman_ysize, false)?;
-
- for pixel in entropy_image.iter_mut() {
- let meta_huff_code = (*pixel >> 8) & 0xffff;
-
- *pixel = meta_huff_code;
-
- if meta_huff_code >= num_huff_groups {
- num_huff_groups = meta_huff_code + 1;
- }
- }
- }
-
- let mut hufftree_groups = Vec::new();
-
- for _i in 0..num_huff_groups {
- let mut group: HuffmanCodeGroup = Default::default();
- for j in 0..HUFFMAN_CODES_PER_META_CODE {
- let mut alphabet_size = ALPHABET_SIZE[j];
- if j == 0 {
- if let Some(color_cache) = color_cache.as_ref() {
- alphabet_size += 1 << color_cache.color_cache_bits;
- }
- }
-
- let tree = self.read_huffman_code(alphabet_size)?;
- group[j] = tree;
- }
- hufftree_groups.push(group);
- }
-
- let huffman_mask = if huffman_bits == 0 {
- !0
- } else {
- (1 << huffman_bits) - 1
- };
-
- let info = HuffmanInfo {
- xsize: huffman_xsize,
- _ysize: huffman_ysize,
- color_cache,
- image: entropy_image,
- bits: huffman_bits,
- mask: huffman_mask,
- huffman_code_groups: hufftree_groups,
- };
-
- Ok(info)
- }
-
- /// Decodes and returns a single huffman tree
- fn read_huffman_code(&mut self, alphabet_size: u16) -> ImageResult<HuffmanTree> {
- let simple = self.bit_reader.read_bits::<u8>(1)? == 1;
-
- if simple {
- let num_symbols = self.bit_reader.read_bits::<u8>(1)? + 1;
-
- let mut code_lengths = vec![u16::from(num_symbols - 1)];
- let mut codes = vec![0];
- let mut symbols = Vec::new();
-
- let is_first_8bits = self.bit_reader.read_bits::<u8>(1)?;
- symbols.push(self.bit_reader.read_bits::<u16>(1 + 7 * is_first_8bits)?);
-
- if num_symbols == 2 {
- symbols.push(self.bit_reader.read_bits::<u16>(8)?);
- code_lengths.push(1);
- codes.push(1);
- }
-
- HuffmanTree::build_explicit(code_lengths, codes, symbols)
- } else {
- let mut code_length_code_lengths = vec![0; CODE_LENGTH_CODES];
-
- let num_code_lengths = 4 + self.bit_reader.read_bits::<usize>(4)?;
- for i in 0..num_code_lengths {
- code_length_code_lengths[CODE_LENGTH_CODE_ORDER[i]] =
- self.bit_reader.read_bits(3)?;
- }
-
- let new_code_lengths =
- self.read_huffman_code_lengths(code_length_code_lengths, alphabet_size)?;
-
- HuffmanTree::build_implicit(new_code_lengths)
- }
- }
-
- /// Reads huffman code lengths
- fn read_huffman_code_lengths(
- &mut self,
- code_length_code_lengths: Vec<u16>,
- num_symbols: u16,
- ) -> ImageResult<Vec<u16>> {
- let table = HuffmanTree::build_implicit(code_length_code_lengths)?;
-
- let mut max_symbol = if self.bit_reader.read_bits::<u8>(1)? == 1 {
- let length_nbits = 2 + 2 * self.bit_reader.read_bits::<u8>(3)?;
- 2 + self.bit_reader.read_bits::<u16>(length_nbits)?
- } else {
- num_symbols
- };
-
- let mut code_lengths = vec![0; usize::from(num_symbols)];
- let mut prev_code_len = 8; //default code length
-
- let mut symbol = 0;
- while symbol < num_symbols {
- if max_symbol == 0 {
- break;
- }
- max_symbol -= 1;
-
- let code_len = table.read_symbol(&mut self.bit_reader)?;
-
- if code_len < 16 {
- code_lengths[usize::from(symbol)] = code_len;
- symbol += 1;
- if code_len != 0 {
- prev_code_len = code_len;
- }
- } else {
- let use_prev = code_len == 16;
- let slot = code_len - 16;
- let extra_bits = match slot {
- 0 => 2,
- 1 => 3,
- 2 => 7,
- _ => return Err(DecoderError::BitStreamError.into()),
- };
- let repeat_offset = match slot {
- 0 | 1 => 3,
- 2 => 11,
- _ => return Err(DecoderError::BitStreamError.into()),
- };
-
- let mut repeat = self.bit_reader.read_bits::<u16>(extra_bits)? + repeat_offset;
-
- if symbol + repeat > num_symbols {
- return Err(DecoderError::BitStreamError.into());
- } else {
- let length = if use_prev { prev_code_len } else { 0 };
- while repeat > 0 {
- repeat -= 1;
- code_lengths[usize::from(symbol)] = length;
- symbol += 1;
- }
- }
- }
- }
-
- Ok(code_lengths)
- }
-
- /// Decodes the image data using the huffman trees and either of the 3 methods of decoding
- fn decode_image_data(
- &mut self,
- width: u16,
- height: u16,
- mut huffman_info: HuffmanInfo,
- ) -> ImageResult<Vec<u32>> {
- let num_values = usize::from(width) * usize::from(height);
- let mut data = vec![0; num_values];
-
- let huff_index = huffman_info.get_huff_index(0, 0);
- let mut tree = &huffman_info.huffman_code_groups[huff_index];
- let mut last_cached = 0;
- let mut index = 0;
- let mut x = 0;
- let mut y = 0;
- while index < num_values {
- if (x & huffman_info.mask) == 0 {
- let index = huffman_info.get_huff_index(x, y);
- tree = &huffman_info.huffman_code_groups[index];
- }
-
- let code = tree[GREEN].read_symbol(&mut self.bit_reader)?;
-
- //check code
- if code < 256 {
- //literal, so just use huffman codes and read as argb
- let red = tree[RED].read_symbol(&mut self.bit_reader)?;
- let blue = tree[BLUE].read_symbol(&mut self.bit_reader)?;
- let alpha = tree[ALPHA].read_symbol(&mut self.bit_reader)?;
-
- data[index] = (u32::from(alpha) << 24)
- + (u32::from(red) << 16)
- + (u32::from(code) << 8)
- + u32::from(blue);
-
- index += 1;
- x += 1;
- if x >= width {
- x = 0;
- y += 1;
- }
- } else if code < 256 + 24 {
- //backward reference, so go back and use that to add image data
- let length_symbol = code - 256;
- let length = Self::get_copy_distance(&mut self.bit_reader, length_symbol)?;
-
- let dist_symbol = tree[DIST].read_symbol(&mut self.bit_reader)?;
- let dist_code = Self::get_copy_distance(&mut self.bit_reader, dist_symbol)?;
- let dist = Self::plane_code_to_distance(width, dist_code);
-
- if index < dist || num_values - index < length {
- return Err(DecoderError::BitStreamError.into());
- }
-
- for i in 0..length {
- data[index + i] = data[index + i - dist];
- }
- index += length;
- x += u16::try_from(length).unwrap();
- while x >= width {
- x -= width;
- y += 1;
- }
- if index < num_values {
- let index = huffman_info.get_huff_index(x, y);
- tree = &huffman_info.huffman_code_groups[index];
- }
- } else {
- //color cache, so use previously stored pixels to get this pixel
- let key = code - 256 - 24;
-
- if let Some(color_cache) = huffman_info.color_cache.as_mut() {
- //cache old colors
- while last_cached < index {
- color_cache.insert(data[last_cached]);
- last_cached += 1;
- }
- data[index] = color_cache.lookup(key.into())?;
- } else {
- return Err(DecoderError::BitStreamError.into());
- }
- index += 1;
- x += 1;
- if x >= width {
- x = 0;
- y += 1;
- }
- }
- }
-
- Ok(data)
- }
-
- /// Reads color cache data from the bitstream
- fn read_color_cache(&mut self) -> ImageResult<Option<u8>> {
- if self.bit_reader.read_bits::<u8>(1)? == 1 {
- let code_bits = self.bit_reader.read_bits::<u8>(4)?;
-
- if !(1..=11).contains(&code_bits) {
- return Err(DecoderError::InvalidColorCacheBits(code_bits).into());
- }
-
- Ok(Some(code_bits))
- } else {
- Ok(None)
- }
- }
-
- /// Gets the copy distance from the prefix code and bitstream
- fn get_copy_distance(bit_reader: &mut BitReader, prefix_code: u16) -> ImageResult<usize> {
- if prefix_code < 4 {
- return Ok(usize::from(prefix_code + 1));
- }
- let extra_bits: u8 = ((prefix_code - 2) >> 1).try_into().unwrap();
- let offset = (2 + (usize::from(prefix_code) & 1)) << extra_bits;
-
- Ok(offset + bit_reader.read_bits::<usize>(extra_bits)? + 1)
- }
-
- /// Gets distance to pixel
- fn plane_code_to_distance(xsize: u16, plane_code: usize) -> usize {
- if plane_code > 120 {
- plane_code - 120
- } else {
- let (xoffset, yoffset) = DISTANCE_MAP[plane_code - 1];
-
- let dist = i32::from(xoffset) + i32::from(yoffset) * i32::from(xsize);
- if dist < 1 {
- return 1;
- }
- dist.try_into().unwrap()
- }
- }
-}
-
-#[derive(Debug, Clone)]
-struct HuffmanInfo {
- xsize: u16,
- _ysize: u16,
- color_cache: Option<ColorCache>,
- image: Vec<u32>,
- bits: u8,
- mask: u16,
- huffman_code_groups: Vec<HuffmanCodeGroup>,
-}
-
-impl HuffmanInfo {
- fn get_huff_index(&self, x: u16, y: u16) -> usize {
- if self.bits == 0 {
- return 0;
- }
- let position = usize::from((y >> self.bits) * self.xsize + (x >> self.bits));
- let meta_huff_code: usize = self.image[position].try_into().unwrap();
- meta_huff_code
- }
-}
-
-#[derive(Debug, Clone)]
-struct ColorCache {
- color_cache_bits: u8,
- color_cache: Vec<u32>,
-}
-
-impl ColorCache {
- fn insert(&mut self, color: u32) {
- let index = (0x1e35a7bdu32.overflowing_mul(color).0) >> (32 - self.color_cache_bits);
- self.color_cache[index as usize] = color;
- }
-
- fn lookup(&self, index: usize) -> ImageResult<u32> {
- match self.color_cache.get(index) {
- Some(&value) => Ok(value),
- None => Err(DecoderError::BitStreamError.into()),
- }
- }
-}
-
-#[derive(Debug, Clone)]
-pub(crate) struct BitReader {
- buf: Vec<u8>,
- index: usize,
- bit_count: u8,
-}
-
-impl BitReader {
- fn new() -> BitReader {
- BitReader {
- buf: Vec::new(),
- index: 0,
- bit_count: 0,
- }
- }
-
- fn init(&mut self, buf: Vec<u8>) {
- self.buf = buf;
- }
-
- pub(crate) fn read_bits<T>(&mut self, num: u8) -> ImageResult<T>
- where
- T: num_traits::Unsigned + Shl<u8, Output = T> + AddAssign<T> + From<bool>,
- {
- let mut value: T = T::zero();
-
- for i in 0..num {
- if self.buf.len() <= self.index {
- return Err(DecoderError::BitStreamError.into());
- }
- let bit_true = self.buf[self.index] & (1 << self.bit_count) != 0;
- value += T::from(bit_true) << i;
- self.bit_count = if self.bit_count == 7 {
- self.index += 1;
- 0
- } else {
- self.bit_count + 1
- };
- }
-
- Ok(value)
- }
-}
-
-#[derive(Debug, Clone, Default)]
-pub(crate) struct LosslessFrame {
- pub(crate) width: u16,
- pub(crate) height: u16,
-
- pub(crate) buf: Vec<u32>,
-}
-
-impl LosslessFrame {
- /// Fills a buffer by converting from argb to rgba
- pub(crate) fn fill_rgba(&self, buf: &mut [u8]) {
- for (&argb_val, chunk) in self.buf.iter().zip(buf.chunks_exact_mut(4)) {
- chunk[0] = ((argb_val >> 16) & 0xff).try_into().unwrap();
- chunk[1] = ((argb_val >> 8) & 0xff).try_into().unwrap();
- chunk[2] = (argb_val & 0xff).try_into().unwrap();
- chunk[3] = ((argb_val >> 24) & 0xff).try_into().unwrap();
- }
- }
-
- /// Get buffer size from the image
- pub(crate) fn get_buf_size(&self) -> usize {
- usize::from(self.width) * usize::from(self.height) * 4
- }
-
- /// Fills a buffer with just the green values from the lossless decoding
- /// Used in extended alpha decoding
- pub(crate) fn fill_green(&self, buf: &mut [u8]) {
- for (&argb_val, buf_value) in self.buf.iter().zip(buf.iter_mut()) {
- *buf_value = ((argb_val >> 8) & 0xff).try_into().unwrap();
- }
- }
-}
-
-#[cfg(test)]
-mod test {
-
- use super::BitReader;
-
- #[test]
- fn bit_read_test() {
- let mut bit_reader = BitReader::new();
-
- //10011100 01000001 11100001
- let buf = vec![0x9C, 0x41, 0xE1];
-
- bit_reader.init(buf);
-
- assert_eq!(bit_reader.read_bits::<u8>(3).unwrap(), 4); //100
- assert_eq!(bit_reader.read_bits::<u8>(2).unwrap(), 3); //11
- assert_eq!(bit_reader.read_bits::<u8>(6).unwrap(), 12); //001100
- assert_eq!(bit_reader.read_bits::<u16>(10).unwrap(), 40); //0000101000
- assert_eq!(bit_reader.read_bits::<u8>(3).unwrap(), 7); //111
- }
-
- #[test]
- fn bit_read_error_test() {
- let mut bit_reader = BitReader::new();
-
- //01101010
- let buf = vec![0x6A];
-
- bit_reader.init(buf);
-
- assert_eq!(bit_reader.read_bits::<u8>(3).unwrap(), 2); //010
- assert_eq!(bit_reader.read_bits::<u8>(5).unwrap(), 13); //01101
- assert!(bit_reader.read_bits::<u8>(4).is_err()); //error
- }
-}
diff --git a/vendor/image/src/codecs/webp/lossless_transform.rs b/vendor/image/src/codecs/webp/lossless_transform.rs
deleted file mode 100644
index f9a82c1..0000000
--- a/vendor/image/src/codecs/webp/lossless_transform.rs
+++ /dev/null
@@ -1,464 +0,0 @@
-use std::convert::TryFrom;
-use std::convert::TryInto;
-
-use super::lossless::subsample_size;
-use super::lossless::DecoderError;
-
-#[derive(Debug, Clone)]
-pub(crate) enum TransformType {
- PredictorTransform {
- size_bits: u8,
- predictor_data: Vec<u32>,
- },
- ColorTransform {
- size_bits: u8,
- transform_data: Vec<u32>,
- },
- SubtractGreen,
- ColorIndexingTransform {
- table_size: u16,
- table_data: Vec<u32>,
- },
-}
-
-impl TransformType {
- /// Applies a transform to the image data
- pub(crate) fn apply_transform(
- &self,
- image_data: &mut Vec<u32>,
- width: u16,
- height: u16,
- ) -> Result<(), DecoderError> {
- match self {
- TransformType::PredictorTransform {
- size_bits,
- predictor_data,
- } => {
- let block_xsize = usize::from(subsample_size(width, *size_bits));
- let width = usize::from(width);
- let height = usize::from(height);
-
- if image_data.len() < width * height {
- return Err(DecoderError::TransformError);
- }
-
- //handle top and left borders specially
- //this involves ignoring mode and just setting prediction values like this
- image_data[0] = add_pixels(image_data[0], 0xff000000);
-
- for x in 1..width {
- image_data[x] = add_pixels(image_data[x], get_left(image_data, x, 0, width));
- }
-
- for y in 1..height {
- image_data[y * width] =
- add_pixels(image_data[y * width], get_top(image_data, 0, y, width));
- }
-
- for y in 1..height {
- for x in 1..width {
- let block_index = (y >> size_bits) * block_xsize + (x >> size_bits);
-
- let index = y * width + x;
-
- let green = (predictor_data[block_index] >> 8) & 0xff;
-
- match green {
- 0 => image_data[index] = add_pixels(image_data[index], 0xff000000),
- 1 => {
- image_data[index] =
- add_pixels(image_data[index], get_left(image_data, x, y, width))
- }
- 2 => {
- image_data[index] =
- add_pixels(image_data[index], get_top(image_data, x, y, width))
- }
- 3 => {
- image_data[index] = add_pixels(
- image_data[index],
- get_top_right(image_data, x, y, width),
- )
- }
- 4 => {
- image_data[index] = add_pixels(
- image_data[index],
- get_top_left(image_data, x, y, width),
- )
- }
- 5 => {
- image_data[index] = add_pixels(image_data[index], {
- let first = average2(
- get_left(image_data, x, y, width),
- get_top_right(image_data, x, y, width),
- );
- average2(first, get_top(image_data, x, y, width))
- })
- }
- 6 => {
- image_data[index] = add_pixels(
- image_data[index],
- average2(
- get_left(image_data, x, y, width),
- get_top_left(image_data, x, y, width),
- ),
- )
- }
- 7 => {
- image_data[index] = add_pixels(
- image_data[index],
- average2(
- get_left(image_data, x, y, width),
- get_top(image_data, x, y, width),
- ),
- )
- }
- 8 => {
- image_data[index] = add_pixels(
- image_data[index],
- average2(
- get_top_left(image_data, x, y, width),
- get_top(image_data, x, y, width),
- ),
- )
- }
- 9 => {
- image_data[index] = add_pixels(
- image_data[index],
- average2(
- get_top(image_data, x, y, width),
- get_top_right(image_data, x, y, width),
- ),
- )
- }
- 10 => {
- image_data[index] = add_pixels(image_data[index], {
- let first = average2(
- get_left(image_data, x, y, width),
- get_top_left(image_data, x, y, width),
- );
- let second = average2(
- get_top(image_data, x, y, width),
- get_top_right(image_data, x, y, width),
- );
- average2(first, second)
- })
- }
- 11 => {
- image_data[index] = add_pixels(
- image_data[index],
- select(
- get_left(image_data, x, y, width),
- get_top(image_data, x, y, width),
- get_top_left(image_data, x, y, width),
- ),
- )
- }
- 12 => {
- image_data[index] = add_pixels(
- image_data[index],
- clamp_add_subtract_full(
- get_left(image_data, x, y, width),
- get_top(image_data, x, y, width),
- get_top_left(image_data, x, y, width),
- ),
- )
- }
- 13 => {
- image_data[index] = add_pixels(image_data[index], {
- let first = average2(
- get_left(image_data, x, y, width),
- get_top(image_data, x, y, width),
- );
- clamp_add_subtract_half(
- first,
- get_top_left(image_data, x, y, width),
- )
- })
- }
- _ => {}
- }
- }
- }
- }
- TransformType::ColorTransform {
- size_bits,
- transform_data,
- } => {
- let block_xsize = usize::from(subsample_size(width, *size_bits));
- let width = usize::from(width);
- let height = usize::from(height);
-
- for y in 0..height {
- for x in 0..width {
- let block_index = (y >> size_bits) * block_xsize + (x >> size_bits);
-
- let index = y * width + x;
-
- let multiplier =
- ColorTransformElement::from_color_code(transform_data[block_index]);
-
- image_data[index] = transform_color(&multiplier, image_data[index]);
- }
- }
- }
- TransformType::SubtractGreen => {
- let width = usize::from(width);
- for y in 0..usize::from(height) {
- for x in 0..width {
- image_data[y * width + x] = add_green(image_data[y * width + x]);
- }
- }
- }
- TransformType::ColorIndexingTransform {
- table_size,
- table_data,
- } => {
- let mut new_image_data =
- Vec::with_capacity(usize::from(width) * usize::from(height));
-
- let table_size = *table_size;
- let width_bits: u8 = if table_size <= 2 {
- 3
- } else if table_size <= 4 {
- 2
- } else if table_size <= 16 {
- 1
- } else {
- 0
- };
-
- let bits_per_pixel = 8 >> width_bits;
- let mask = (1 << bits_per_pixel) - 1;
-
- let mut src = 0;
- let width = usize::from(width);
-
- let pixels_per_byte = 1 << width_bits;
- let count_mask = pixels_per_byte - 1;
- let mut packed_pixels = 0;
-
- for _y in 0..usize::from(height) {
- for x in 0..width {
- if (x & count_mask) == 0 {
- packed_pixels = (image_data[src] >> 8) & 0xff;
- src += 1;
- }
-
- let pixels: usize = (packed_pixels & mask).try_into().unwrap();
- let new_val = if pixels >= table_size.into() {
- 0x00000000
- } else {
- table_data[pixels]
- };
-
- new_image_data.push(new_val);
-
- packed_pixels >>= bits_per_pixel;
- }
- }
-
- *image_data = new_image_data;
- }
- }
-
- Ok(())
- }
-}
-
-//predictor functions
-
-/// Adds 2 pixels mod 256 for each pixel
-pub(crate) fn add_pixels(a: u32, b: u32) -> u32 {
- let new_alpha = ((a >> 24) + (b >> 24)) & 0xff;
- let new_red = (((a >> 16) & 0xff) + ((b >> 16) & 0xff)) & 0xff;
- let new_green = (((a >> 8) & 0xff) + ((b >> 8) & 0xff)) & 0xff;
- let new_blue = ((a & 0xff) + (b & 0xff)) & 0xff;
-
- (new_alpha << 24) + (new_red << 16) + (new_green << 8) + new_blue
-}
-
-/// Get left pixel
-fn get_left(data: &[u32], x: usize, y: usize, width: usize) -> u32 {
- data[y * width + x - 1]
-}
-
-/// Get top pixel
-fn get_top(data: &[u32], x: usize, y: usize, width: usize) -> u32 {
- data[(y - 1) * width + x]
-}
-
-/// Get pixel to top right
-fn get_top_right(data: &[u32], x: usize, y: usize, width: usize) -> u32 {
- // if x == width - 1 this gets the left most pixel of the current row
- // as described in the specification
- data[(y - 1) * width + x + 1]
-}
-
-/// Get pixel to top left
-fn get_top_left(data: &[u32], x: usize, y: usize, width: usize) -> u32 {
- data[(y - 1) * width + x - 1]
-}
-
-/// Get average of 2 pixels
-fn average2(a: u32, b: u32) -> u32 {
- let mut avg = 0u32;
- for i in 0..4 {
- let sub_a: u8 = ((a >> (i * 8)) & 0xff).try_into().unwrap();
- let sub_b: u8 = ((b >> (i * 8)) & 0xff).try_into().unwrap();
- avg |= u32::from(sub_average2(sub_a, sub_b)) << (i * 8);
- }
- avg
-}
-
-/// Get average of 2 bytes
-fn sub_average2(a: u8, b: u8) -> u8 {
- ((u16::from(a) + u16::from(b)) / 2).try_into().unwrap()
-}
-
-/// Get a specific byte from argb pixel
-fn get_byte(val: u32, byte: u8) -> u8 {
- ((val >> (byte * 8)) & 0xff).try_into().unwrap()
-}
-
-/// Get byte as i32 for convenience
-fn get_byte_i32(val: u32, byte: u8) -> i32 {
- i32::from(get_byte(val, byte))
-}
-
-/// Select left or top byte
-fn select(left: u32, top: u32, top_left: u32) -> u32 {
- let predict_alpha = get_byte_i32(left, 3) + get_byte_i32(top, 3) - get_byte_i32(top_left, 3);
- let predict_red = get_byte_i32(left, 2) + get_byte_i32(top, 2) - get_byte_i32(top_left, 2);
- let predict_green = get_byte_i32(left, 1) + get_byte_i32(top, 1) - get_byte_i32(top_left, 1);
- let predict_blue = get_byte_i32(left, 0) + get_byte_i32(top, 0) - get_byte_i32(top_left, 0);
-
- let predict_left = i32::abs(predict_alpha - get_byte_i32(left, 3))
- + i32::abs(predict_red - get_byte_i32(left, 2))
- + i32::abs(predict_green - get_byte_i32(left, 1))
- + i32::abs(predict_blue - get_byte_i32(left, 0));
- let predict_top = i32::abs(predict_alpha - get_byte_i32(top, 3))
- + i32::abs(predict_red - get_byte_i32(top, 2))
- + i32::abs(predict_green - get_byte_i32(top, 1))
- + i32::abs(predict_blue - get_byte_i32(top, 0));
-
- if predict_left < predict_top {
- left
- } else {
- top
- }
-}
-
-/// Clamp a to [0, 255]
-fn clamp(a: i32) -> i32 {
- if a < 0 {
- 0
- } else if a > 255 {
- 255
- } else {
- a
- }
-}
-
-/// Clamp add subtract full on one part
-fn clamp_add_subtract_full_sub(a: i32, b: i32, c: i32) -> i32 {
- clamp(a + b - c)
-}
-
-/// Clamp add subtract half on one part
-fn clamp_add_subtract_half_sub(a: i32, b: i32) -> i32 {
- clamp(a + (a - b) / 2)
-}
-
-/// Clamp add subtract full on 3 pixels
-fn clamp_add_subtract_full(a: u32, b: u32, c: u32) -> u32 {
- let mut value: u32 = 0;
- for i in 0..4u8 {
- let sub_a: i32 = ((a >> (i * 8)) & 0xff).try_into().unwrap();
- let sub_b: i32 = ((b >> (i * 8)) & 0xff).try_into().unwrap();
- let sub_c: i32 = ((c >> (i * 8)) & 0xff).try_into().unwrap();
- value |=
- u32::try_from(clamp_add_subtract_full_sub(sub_a, sub_b, sub_c)).unwrap() << (i * 8);
- }
- value
-}
-
-/// Clamp add subtract half on 2 pixels
-fn clamp_add_subtract_half(a: u32, b: u32) -> u32 {
- let mut value = 0;
- for i in 0..4u8 {
- let sub_a: i32 = ((a >> (i * 8)) & 0xff).try_into().unwrap();
- let sub_b: i32 = ((b >> (i * 8)) & 0xff).try_into().unwrap();
- value |= u32::try_from(clamp_add_subtract_half_sub(sub_a, sub_b)).unwrap() << (i * 8);
- }
-
- value
-}
-
-//color transform
-
-#[derive(Debug, Clone, Copy)]
-struct ColorTransformElement {
- green_to_red: u8,
- green_to_blue: u8,
- red_to_blue: u8,
-}
-
-impl ColorTransformElement {
- fn from_color_code(color_code: u32) -> ColorTransformElement {
- ColorTransformElement {
- green_to_red: (color_code & 0xff).try_into().unwrap(),
- green_to_blue: ((color_code >> 8) & 0xff).try_into().unwrap(),
- red_to_blue: ((color_code >> 16) & 0xff).try_into().unwrap(),
- }
- }
-}
-
-/// Does color transform on red and blue transformed by green
-fn color_transform(red: u8, blue: u8, green: u8, trans: &ColorTransformElement) -> (u8, u8) {
- let mut temp_red = u32::from(red);
- let mut temp_blue = u32::from(blue);
-
- //as does the conversion from u8 to signed two's complement i8 required
- temp_red += color_transform_delta(trans.green_to_red as i8, green as i8);
- temp_blue += color_transform_delta(trans.green_to_blue as i8, green as i8);
- temp_blue += color_transform_delta(trans.red_to_blue as i8, temp_red as i8);
-
- (
- (temp_red & 0xff).try_into().unwrap(),
- (temp_blue & 0xff).try_into().unwrap(),
- )
-}
-
-/// Does color transform on 2 numbers
-fn color_transform_delta(t: i8, c: i8) -> u32 {
- ((i16::from(t) * i16::from(c)) as u32) >> 5
-}
-
-// Does color transform on a pixel with a color transform element
-fn transform_color(multiplier: &ColorTransformElement, color_value: u32) -> u32 {
- let alpha = get_byte(color_value, 3);
- let red = get_byte(color_value, 2);
- let green = get_byte(color_value, 1);
- let blue = get_byte(color_value, 0);
-
- let (new_red, new_blue) = color_transform(red, blue, green, multiplier);
-
- (u32::from(alpha) << 24)
- + (u32::from(new_red) << 16)
- + (u32::from(green) << 8)
- + u32::from(new_blue)
-}
-
-//subtract green function
-
-/// Adds green to red and blue of a pixel
-fn add_green(argb: u32) -> u32 {
- let red = (argb >> 16) & 0xff;
- let green = (argb >> 8) & 0xff;
- let blue = argb & 0xff;
-
- let new_red = (red + green) & 0xff;
- let new_blue = (blue + green) & 0xff;
-
- (argb & 0xff00ff00) | (new_red << 16) | (new_blue)
-}
diff --git a/vendor/image/src/codecs/webp/mod.rs b/vendor/image/src/codecs/webp/mod.rs
deleted file mode 100644
index b38faed..0000000
--- a/vendor/image/src/codecs/webp/mod.rs
+++ /dev/null
@@ -1,28 +0,0 @@
-//! Decoding and Encoding of WebP Images
-
-#[cfg(feature = "webp-encoder")]
-pub use self::encoder::{WebPEncoder, WebPQuality};
-
-#[cfg(feature = "webp-encoder")]
-mod encoder;
-
-#[cfg(feature = "webp")]
-pub use self::decoder::WebPDecoder;
-
-#[cfg(feature = "webp")]
-mod decoder;
-#[cfg(feature = "webp")]
-mod extended;
-#[cfg(feature = "webp")]
-mod huffman;
-#[cfg(feature = "webp")]
-mod loop_filter;
-#[cfg(feature = "webp")]
-mod lossless;
-#[cfg(feature = "webp")]
-mod lossless_transform;
-#[cfg(feature = "webp")]
-mod transform;
-
-#[cfg(feature = "webp")]
-pub mod vp8;
diff --git a/vendor/image/src/codecs/webp/transform.rs b/vendor/image/src/codecs/webp/transform.rs
deleted file mode 100644
index 3b3ef5a..0000000
--- a/vendor/image/src/codecs/webp/transform.rs
+++ /dev/null
@@ -1,77 +0,0 @@
-static CONST1: i64 = 20091;
-static CONST2: i64 = 35468;
-
-pub(crate) fn idct4x4(block: &mut [i32]) {
- // The intermediate results may overflow the types, so we stretch the type.
- fn fetch(block: &mut [i32], idx: usize) -> i64 {
- i64::from(block[idx])
- }
-
- for i in 0usize..4 {
- let a1 = fetch(block, i) + fetch(block, 8 + i);
- let b1 = fetch(block, i) - fetch(block, 8 + i);
-
- let t1 = (fetch(block, 4 + i) * CONST2) >> 16;
- let t2 = fetch(block, 12 + i) + ((fetch(block, 12 + i) * CONST1) >> 16);
- let c1 = t1 - t2;
-
- let t1 = fetch(block, 4 + i) + ((fetch(block, 4 + i) * CONST1) >> 16);
- let t2 = (fetch(block, 12 + i) * CONST2) >> 16;
- let d1 = t1 + t2;
-
- block[i] = (a1 + d1) as i32;
- block[4 + i] = (b1 + c1) as i32;
- block[4 * 3 + i] = (a1 - d1) as i32;
- block[4 * 2 + i] = (b1 - c1) as i32;
- }
-
- for i in 0usize..4 {
- let a1 = fetch(block, 4 * i) + fetch(block, 4 * i + 2);
- let b1 = fetch(block, 4 * i) - fetch(block, 4 * i + 2);
-
- let t1 = (fetch(block, 4 * i + 1) * CONST2) >> 16;
- let t2 = fetch(block, 4 * i + 3) + ((fetch(block, 4 * i + 3) * CONST1) >> 16);
- let c1 = t1 - t2;
-
- let t1 = fetch(block, 4 * i + 1) + ((fetch(block, 4 * i + 1) * CONST1) >> 16);
- let t2 = (fetch(block, 4 * i + 3) * CONST2) >> 16;
- let d1 = t1 + t2;
-
- block[4 * i] = ((a1 + d1 + 4) >> 3) as i32;
- block[4 * i + 3] = ((a1 - d1 + 4) >> 3) as i32;
- block[4 * i + 1] = ((b1 + c1 + 4) >> 3) as i32;
- block[4 * i + 2] = ((b1 - c1 + 4) >> 3) as i32;
- }
-}
-
-// 14.3
-pub(crate) fn iwht4x4(block: &mut [i32]) {
- for i in 0usize..4 {
- let a1 = block[i] + block[12 + i];
- let b1 = block[4 + i] + block[8 + i];
- let c1 = block[4 + i] - block[8 + i];
- let d1 = block[i] - block[12 + i];
-
- block[i] = a1 + b1;
- block[4 + i] = c1 + d1;
- block[8 + i] = a1 - b1;
- block[12 + i] = d1 - c1;
- }
-
- for i in 0usize..4 {
- let a1 = block[4 * i] + block[4 * i + 3];
- let b1 = block[4 * i + 1] + block[4 * i + 2];
- let c1 = block[4 * i + 1] - block[4 * i + 2];
- let d1 = block[4 * i] - block[4 * i + 3];
-
- let a2 = a1 + b1;
- let b2 = c1 + d1;
- let c2 = a1 - b1;
- let d2 = d1 - c1;
-
- block[4 * i] = (a2 + 3) >> 3;
- block[4 * i + 1] = (b2 + 3) >> 3;
- block[4 * i + 2] = (c2 + 3) >> 3;
- block[4 * i + 3] = (d2 + 3) >> 3;
- }
-}
diff --git a/vendor/image/src/codecs/webp/vp8.rs b/vendor/image/src/codecs/webp/vp8.rs
deleted file mode 100644
index 67b8820..0000000
--- a/vendor/image/src/codecs/webp/vp8.rs
+++ /dev/null
@@ -1,2932 +0,0 @@
-//! An implementation of the VP8 Video Codec
-//!
-//! This module contains a partial implementation of the
-//! VP8 video format as defined in RFC-6386.
-//!
-//! It decodes Keyframes only.
-//! VP8 is the underpinning of the WebP image format
-//!
-//! # Related Links
-//! * [rfc-6386](http://tools.ietf.org/html/rfc6386) - The VP8 Data Format and Decoding Guide
-//! * [VP8.pdf](http://static.googleusercontent.com/media/research.google.com/en//pubs/archive/37073.pdf) - An overview of
-//! of the VP8 format
-//!
-
-use byteorder::{LittleEndian, ReadBytesExt};
-use std::convert::TryInto;
-use std::default::Default;
-use std::io::Read;
-use std::{cmp, error, fmt};
-
-use super::loop_filter;
-use super::transform;
-use crate::error::{
- DecodingError, ImageError, ImageResult, UnsupportedError, UnsupportedErrorKind,
-};
-use crate::image::ImageFormat;
-
-use crate::utils::clamp;
-
-const MAX_SEGMENTS: usize = 4;
-const NUM_DCT_TOKENS: usize = 12;
-
-// Prediction modes
-const DC_PRED: i8 = 0;
-const V_PRED: i8 = 1;
-const H_PRED: i8 = 2;
-const TM_PRED: i8 = 3;
-const B_PRED: i8 = 4;
-
-const B_DC_PRED: i8 = 0;
-const B_TM_PRED: i8 = 1;
-const B_VE_PRED: i8 = 2;
-const B_HE_PRED: i8 = 3;
-const B_LD_PRED: i8 = 4;
-const B_RD_PRED: i8 = 5;
-const B_VR_PRED: i8 = 6;
-const B_VL_PRED: i8 = 7;
-const B_HD_PRED: i8 = 8;
-const B_HU_PRED: i8 = 9;
-
-// Prediction mode enum
-#[repr(i8)]
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-enum LumaMode {
- /// Predict DC using row above and column to the left.
- DC = DC_PRED,
-
- /// Predict rows using row above.
- V = V_PRED,
-
- /// Predict columns using column to the left.
- H = H_PRED,
-
- /// Propagate second differences.
- TM = TM_PRED,
-
- /// Each Y subblock is independently predicted.
- B = B_PRED,
-}
-
-#[repr(i8)]
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-enum ChromaMode {
- /// Predict DC using row above and column to the left.
- DC = DC_PRED,
-
- /// Predict rows using row above.
- V = V_PRED,
-
- /// Predict columns using column to the left.
- H = H_PRED,
-
- /// Propagate second differences.
- TM = TM_PRED,
-}
-
-#[repr(i8)]
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-enum IntraMode {
- DC = B_DC_PRED,
- TM = B_TM_PRED,
- VE = B_VE_PRED,
- HE = B_HE_PRED,
- LD = B_LD_PRED,
- RD = B_RD_PRED,
- VR = B_VR_PRED,
- VL = B_VL_PRED,
- HD = B_HD_PRED,
- HU = B_HU_PRED,
-}
-
-type Prob = u8;
-
-static SEGMENT_ID_TREE: [i8; 6] = [2, 4, -0, -1, -2, -3];
-
-// Section 11.2
-// Tree for determining the keyframe luma intra prediction modes:
-static KEYFRAME_YMODE_TREE: [i8; 8] = [-B_PRED, 2, 4, 6, -DC_PRED, -V_PRED, -H_PRED, -TM_PRED];
-
-// Default probabilities for decoding the keyframe luma modes
-static KEYFRAME_YMODE_PROBS: [Prob; 4] = [145, 156, 163, 128];
-
-// Tree for determining the keyframe B_PRED mode:
-static KEYFRAME_BPRED_MODE_TREE: [i8; 18] = [
- -B_DC_PRED, 2, -B_TM_PRED, 4, -B_VE_PRED, 6, 8, 12, -B_HE_PRED, 10, -B_RD_PRED, -B_VR_PRED,
- -B_LD_PRED, 14, -B_VL_PRED, 16, -B_HD_PRED, -B_HU_PRED,
-];
-
-// Probabilities for the BPRED_MODE_TREE
-static KEYFRAME_BPRED_MODE_PROBS: [[[u8; 9]; 10]; 10] = [
- [
- [231, 120, 48, 89, 115, 113, 120, 152, 112],
- [152, 179, 64, 126, 170, 118, 46, 70, 95],
- [175, 69, 143, 80, 85, 82, 72, 155, 103],
- [56, 58, 10, 171, 218, 189, 17, 13, 152],
- [144, 71, 10, 38, 171, 213, 144, 34, 26],
- [114, 26, 17, 163, 44, 195, 21, 10, 173],
- [121, 24, 80, 195, 26, 62, 44, 64, 85],
- [170, 46, 55, 19, 136, 160, 33, 206, 71],
- [63, 20, 8, 114, 114, 208, 12, 9, 226],
- [81, 40, 11, 96, 182, 84, 29, 16, 36],
- ],
- [
- [134, 183, 89, 137, 98, 101, 106, 165, 148],
- [72, 187, 100, 130, 157, 111, 32, 75, 80],
- [66, 102, 167, 99, 74, 62, 40, 234, 128],
- [41, 53, 9, 178, 241, 141, 26, 8, 107],
- [104, 79, 12, 27, 217, 255, 87, 17, 7],
- [74, 43, 26, 146, 73, 166, 49, 23, 157],
- [65, 38, 105, 160, 51, 52, 31, 115, 128],
- [87, 68, 71, 44, 114, 51, 15, 186, 23],
- [47, 41, 14, 110, 182, 183, 21, 17, 194],
- [66, 45, 25, 102, 197, 189, 23, 18, 22],
- ],
- [
- [88, 88, 147, 150, 42, 46, 45, 196, 205],
- [43, 97, 183, 117, 85, 38, 35, 179, 61],
- [39, 53, 200, 87, 26, 21, 43, 232, 171],
- [56, 34, 51, 104, 114, 102, 29, 93, 77],
- [107, 54, 32, 26, 51, 1, 81, 43, 31],
- [39, 28, 85, 171, 58, 165, 90, 98, 64],
- [34, 22, 116, 206, 23, 34, 43, 166, 73],
- [68, 25, 106, 22, 64, 171, 36, 225, 114],
- [34, 19, 21, 102, 132, 188, 16, 76, 124],
- [62, 18, 78, 95, 85, 57, 50, 48, 51],
- ],
- [
- [193, 101, 35, 159, 215, 111, 89, 46, 111],
- [60, 148, 31, 172, 219, 228, 21, 18, 111],
- [112, 113, 77, 85, 179, 255, 38, 120, 114],
- [40, 42, 1, 196, 245, 209, 10, 25, 109],
- [100, 80, 8, 43, 154, 1, 51, 26, 71],
- [88, 43, 29, 140, 166, 213, 37, 43, 154],
- [61, 63, 30, 155, 67, 45, 68, 1, 209],
- [142, 78, 78, 16, 255, 128, 34, 197, 171],
- [41, 40, 5, 102, 211, 183, 4, 1, 221],
- [51, 50, 17, 168, 209, 192, 23, 25, 82],
- ],
- [
- [125, 98, 42, 88, 104, 85, 117, 175, 82],
- [95, 84, 53, 89, 128, 100, 113, 101, 45],
- [75, 79, 123, 47, 51, 128, 81, 171, 1],
- [57, 17, 5, 71, 102, 57, 53, 41, 49],
- [115, 21, 2, 10, 102, 255, 166, 23, 6],
- [38, 33, 13, 121, 57, 73, 26, 1, 85],
- [41, 10, 67, 138, 77, 110, 90, 47, 114],
- [101, 29, 16, 10, 85, 128, 101, 196, 26],
- [57, 18, 10, 102, 102, 213, 34, 20, 43],
- [117, 20, 15, 36, 163, 128, 68, 1, 26],
- ],
- [
- [138, 31, 36, 171, 27, 166, 38, 44, 229],
- [67, 87, 58, 169, 82, 115, 26, 59, 179],
- [63, 59, 90, 180, 59, 166, 93, 73, 154],
- [40, 40, 21, 116, 143, 209, 34, 39, 175],
- [57, 46, 22, 24, 128, 1, 54, 17, 37],
- [47, 15, 16, 183, 34, 223, 49, 45, 183],
- [46, 17, 33, 183, 6, 98, 15, 32, 183],
- [65, 32, 73, 115, 28, 128, 23, 128, 205],
- [40, 3, 9, 115, 51, 192, 18, 6, 223],
- [87, 37, 9, 115, 59, 77, 64, 21, 47],
- ],
- [
- [104, 55, 44, 218, 9, 54, 53, 130, 226],
- [64, 90, 70, 205, 40, 41, 23, 26, 57],
- [54, 57, 112, 184, 5, 41, 38, 166, 213],
- [30, 34, 26, 133, 152, 116, 10, 32, 134],
- [75, 32, 12, 51, 192, 255, 160, 43, 51],
- [39, 19, 53, 221, 26, 114, 32, 73, 255],
- [31, 9, 65, 234, 2, 15, 1, 118, 73],
- [88, 31, 35, 67, 102, 85, 55, 186, 85],
- [56, 21, 23, 111, 59, 205, 45, 37, 192],
- [55, 38, 70, 124, 73, 102, 1, 34, 98],
- ],
- [
- [102, 61, 71, 37, 34, 53, 31, 243, 192],
- [69, 60, 71, 38, 73, 119, 28, 222, 37],
- [68, 45, 128, 34, 1, 47, 11, 245, 171],
- [62, 17, 19, 70, 146, 85, 55, 62, 70],
- [75, 15, 9, 9, 64, 255, 184, 119, 16],
- [37, 43, 37, 154, 100, 163, 85, 160, 1],
- [63, 9, 92, 136, 28, 64, 32, 201, 85],
- [86, 6, 28, 5, 64, 255, 25, 248, 1],
- [56, 8, 17, 132, 137, 255, 55, 116, 128],
- [58, 15, 20, 82, 135, 57, 26, 121, 40],
- ],
- [
- [164, 50, 31, 137, 154, 133, 25, 35, 218],
- [51, 103, 44, 131, 131, 123, 31, 6, 158],
- [86, 40, 64, 135, 148, 224, 45, 183, 128],
- [22, 26, 17, 131, 240, 154, 14, 1, 209],
- [83, 12, 13, 54, 192, 255, 68, 47, 28],
- [45, 16, 21, 91, 64, 222, 7, 1, 197],
- [56, 21, 39, 155, 60, 138, 23, 102, 213],
- [85, 26, 85, 85, 128, 128, 32, 146, 171],
- [18, 11, 7, 63, 144, 171, 4, 4, 246],
- [35, 27, 10, 146, 174, 171, 12, 26, 128],
- ],
- [
- [190, 80, 35, 99, 180, 80, 126, 54, 45],
- [85, 126, 47, 87, 176, 51, 41, 20, 32],
- [101, 75, 128, 139, 118, 146, 116, 128, 85],
- [56, 41, 15, 176, 236, 85, 37, 9, 62],
- [146, 36, 19, 30, 171, 255, 97, 27, 20],
- [71, 30, 17, 119, 118, 255, 17, 18, 138],
- [101, 38, 60, 138, 55, 70, 43, 26, 142],
- [138, 45, 61, 62, 219, 1, 81, 188, 64],
- [32, 41, 20, 117, 151, 142, 20, 21, 163],
- [112, 19, 12, 61, 195, 128, 48, 4, 24],
- ],
-];
-
-// Section 11.4 Tree for determining macroblock the chroma mode
-static KEYFRAME_UV_MODE_TREE: [i8; 6] = [-DC_PRED, 2, -V_PRED, 4, -H_PRED, -TM_PRED];
-
-// Probabilities for determining macroblock mode
-static KEYFRAME_UV_MODE_PROBS: [Prob; 3] = [142, 114, 183];
-
-// Section 13.4
-type TokenProbTables = [[[[Prob; NUM_DCT_TOKENS - 1]; 3]; 8]; 4];
-
-// Probabilities that a token's probability will be updated
-static COEFF_UPDATE_PROBS: TokenProbTables = [
- [
- [
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [176, 246, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [223, 241, 252, 255, 255, 255, 255, 255, 255, 255, 255],
- [249, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 244, 252, 255, 255, 255, 255, 255, 255, 255, 255],
- [234, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 246, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [239, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [251, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [251, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 254, 253, 255, 254, 255, 255, 255, 255, 255, 255],
- [250, 255, 254, 255, 254, 255, 255, 255, 255, 255, 255],
- [254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- ],
- [
- [
- [217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [225, 252, 241, 253, 255, 255, 254, 255, 255, 255, 255],
- [234, 250, 241, 250, 253, 255, 253, 254, 255, 255, 255],
- ],
- [
- [255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [223, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [238, 253, 254, 254, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [249, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [247, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [252, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255],
- [250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- ],
- [
- [
- [186, 251, 250, 255, 255, 255, 255, 255, 255, 255, 255],
- [234, 251, 244, 254, 255, 255, 255, 255, 255, 255, 255],
- [251, 251, 243, 253, 254, 255, 254, 255, 255, 255, 255],
- ],
- [
- [255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [236, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [251, 253, 253, 254, 254, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [254, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- ],
- [
- [
- [248, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [250, 254, 252, 254, 255, 255, 255, 255, 255, 255, 255],
- [248, 254, 249, 253, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255],
- [246, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255],
- [252, 254, 251, 254, 254, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 254, 252, 255, 255, 255, 255, 255, 255, 255, 255],
- [248, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255],
- [253, 255, 254, 254, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [245, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [253, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 251, 253, 255, 255, 255, 255, 255, 255, 255, 255],
- [252, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 252, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [249, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 255, 253, 255, 255, 255, 255, 255, 255, 255, 255],
- [250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- [
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
- ],
- ],
-];
-
-// Section 13.5
-// Default Probabilities for tokens
-static COEFF_PROBS: TokenProbTables = [
- [
- [
- [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
- [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
- [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
- ],
- [
- [253, 136, 254, 255, 228, 219, 128, 128, 128, 128, 128],
- [189, 129, 242, 255, 227, 213, 255, 219, 128, 128, 128],
- [106, 126, 227, 252, 214, 209, 255, 255, 128, 128, 128],
- ],
- [
- [1, 98, 248, 255, 236, 226, 255, 255, 128, 128, 128],
- [181, 133, 238, 254, 221, 234, 255, 154, 128, 128, 128],
- [78, 134, 202, 247, 198, 180, 255, 219, 128, 128, 128],
- ],
- [
- [1, 185, 249, 255, 243, 255, 128, 128, 128, 128, 128],
- [184, 150, 247, 255, 236, 224, 128, 128, 128, 128, 128],
- [77, 110, 216, 255, 236, 230, 128, 128, 128, 128, 128],
- ],
- [
- [1, 101, 251, 255, 241, 255, 128, 128, 128, 128, 128],
- [170, 139, 241, 252, 236, 209, 255, 255, 128, 128, 128],
- [37, 116, 196, 243, 228, 255, 255, 255, 128, 128, 128],
- ],
- [
- [1, 204, 254, 255, 245, 255, 128, 128, 128, 128, 128],
- [207, 160, 250, 255, 238, 128, 128, 128, 128, 128, 128],
- [102, 103, 231, 255, 211, 171, 128, 128, 128, 128, 128],
- ],
- [
- [1, 152, 252, 255, 240, 255, 128, 128, 128, 128, 128],
- [177, 135, 243, 255, 234, 225, 128, 128, 128, 128, 128],
- [80, 129, 211, 255, 194, 224, 128, 128, 128, 128, 128],
- ],
- [
- [1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
- [246, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
- [255, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
- ],
- ],
- [
- [
- [198, 35, 237, 223, 193, 187, 162, 160, 145, 155, 62],
- [131, 45, 198, 221, 172, 176, 220, 157, 252, 221, 1],
- [68, 47, 146, 208, 149, 167, 221, 162, 255, 223, 128],
- ],
- [
- [1, 149, 241, 255, 221, 224, 255, 255, 128, 128, 128],
- [184, 141, 234, 253, 222, 220, 255, 199, 128, 128, 128],
- [81, 99, 181, 242, 176, 190, 249, 202, 255, 255, 128],
- ],
- [
- [1, 129, 232, 253, 214, 197, 242, 196, 255, 255, 128],
- [99, 121, 210, 250, 201, 198, 255, 202, 128, 128, 128],
- [23, 91, 163, 242, 170, 187, 247, 210, 255, 255, 128],
- ],
- [
- [1, 200, 246, 255, 234, 255, 128, 128, 128, 128, 128],
- [109, 178, 241, 255, 231, 245, 255, 255, 128, 128, 128],
- [44, 130, 201, 253, 205, 192, 255, 255, 128, 128, 128],
- ],
- [
- [1, 132, 239, 251, 219, 209, 255, 165, 128, 128, 128],
- [94, 136, 225, 251, 218, 190, 255, 255, 128, 128, 128],
- [22, 100, 174, 245, 186, 161, 255, 199, 128, 128, 128],
- ],
- [
- [1, 182, 249, 255, 232, 235, 128, 128, 128, 128, 128],
- [124, 143, 241, 255, 227, 234, 128, 128, 128, 128, 128],
- [35, 77, 181, 251, 193, 211, 255, 205, 128, 128, 128],
- ],
- [
- [1, 157, 247, 255, 236, 231, 255, 255, 128, 128, 128],
- [121, 141, 235, 255, 225, 227, 255, 255, 128, 128, 128],
- [45, 99, 188, 251, 195, 217, 255, 224, 128, 128, 128],
- ],
- [
- [1, 1, 251, 255, 213, 255, 128, 128, 128, 128, 128],
- [203, 1, 248, 255, 255, 128, 128, 128, 128, 128, 128],
- [137, 1, 177, 255, 224, 255, 128, 128, 128, 128, 128],
- ],
- ],
- [
- [
- [253, 9, 248, 251, 207, 208, 255, 192, 128, 128, 128],
- [175, 13, 224, 243, 193, 185, 249, 198, 255, 255, 128],
- [73, 17, 171, 221, 161, 179, 236, 167, 255, 234, 128],
- ],
- [
- [1, 95, 247, 253, 212, 183, 255, 255, 128, 128, 128],
- [239, 90, 244, 250, 211, 209, 255, 255, 128, 128, 128],
- [155, 77, 195, 248, 188, 195, 255, 255, 128, 128, 128],
- ],
- [
- [1, 24, 239, 251, 218, 219, 255, 205, 128, 128, 128],
- [201, 51, 219, 255, 196, 186, 128, 128, 128, 128, 128],
- [69, 46, 190, 239, 201, 218, 255, 228, 128, 128, 128],
- ],
- [
- [1, 191, 251, 255, 255, 128, 128, 128, 128, 128, 128],
- [223, 165, 249, 255, 213, 255, 128, 128, 128, 128, 128],
- [141, 124, 248, 255, 255, 128, 128, 128, 128, 128, 128],
- ],
- [
- [1, 16, 248, 255, 255, 128, 128, 128, 128, 128, 128],
- [190, 36, 230, 255, 236, 255, 128, 128, 128, 128, 128],
- [149, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
- ],
- [
- [1, 226, 255, 128, 128, 128, 128, 128, 128, 128, 128],
- [247, 192, 255, 128, 128, 128, 128, 128, 128, 128, 128],
- [240, 128, 255, 128, 128, 128, 128, 128, 128, 128, 128],
- ],
- [
- [1, 134, 252, 255, 255, 128, 128, 128, 128, 128, 128],
- [213, 62, 250, 255, 255, 128, 128, 128, 128, 128, 128],
- [55, 93, 255, 128, 128, 128, 128, 128, 128, 128, 128],
- ],
- [
- [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
- [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
- [128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
- ],
- ],
- [
- [
- [202, 24, 213, 235, 186, 191, 220, 160, 240, 175, 255],
- [126, 38, 182, 232, 169, 184, 228, 174, 255, 187, 128],
- [61, 46, 138, 219, 151, 178, 240, 170, 255, 216, 128],
- ],
- [
- [1, 112, 230, 250, 199, 191, 247, 159, 255, 255, 128],
- [166, 109, 228, 252, 211, 215, 255, 174, 128, 128, 128],
- [39, 77, 162, 232, 172, 180, 245, 178, 255, 255, 128],
- ],
- [
- [1, 52, 220, 246, 198, 199, 249, 220, 255, 255, 128],
- [124, 74, 191, 243, 183, 193, 250, 221, 255, 255, 128],
- [24, 71, 130, 219, 154, 170, 243, 182, 255, 255, 128],
- ],
- [
- [1, 182, 225, 249, 219, 240, 255, 224, 128, 128, 128],
- [149, 150, 226, 252, 216, 205, 255, 171, 128, 128, 128],
- [28, 108, 170, 242, 183, 194, 254, 223, 255, 255, 128],
- ],
- [
- [1, 81, 230, 252, 204, 203, 255, 192, 128, 128, 128],
- [123, 102, 209, 247, 188, 196, 255, 233, 128, 128, 128],
- [20, 95, 153, 243, 164, 173, 255, 203, 128, 128, 128],
- ],
- [
- [1, 222, 248, 255, 216, 213, 128, 128, 128, 128, 128],
- [168, 175, 246, 252, 235, 205, 255, 255, 128, 128, 128],
- [47, 116, 215, 255, 211, 212, 255, 255, 128, 128, 128],
- ],
- [
- [1, 121, 236, 253, 212, 214, 255, 255, 128, 128, 128],
- [141, 84, 213, 252, 201, 202, 255, 219, 128, 128, 128],
- [42, 80, 160, 240, 162, 185, 255, 205, 128, 128, 128],
- ],
- [
- [1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
- [244, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
- [238, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
- ],
- ],
-];
-
-// DCT Tokens
-const DCT_0: i8 = 0;
-const DCT_1: i8 = 1;
-const DCT_2: i8 = 2;
-const DCT_3: i8 = 3;
-const DCT_4: i8 = 4;
-const DCT_CAT1: i8 = 5;
-const DCT_CAT2: i8 = 6;
-const DCT_CAT3: i8 = 7;
-const DCT_CAT4: i8 = 8;
-const DCT_CAT5: i8 = 9;
-const DCT_CAT6: i8 = 10;
-const DCT_EOB: i8 = 11;
-
-static DCT_TOKEN_TREE: [i8; 22] = [
- -DCT_EOB, 2, -DCT_0, 4, -DCT_1, 6, 8, 12, -DCT_2, 10, -DCT_3, -DCT_4, 14, 16, -DCT_CAT1,
- -DCT_CAT2, 18, 20, -DCT_CAT3, -DCT_CAT4, -DCT_CAT5, -DCT_CAT6,
-];
-
-static PROB_DCT_CAT: [[Prob; 12]; 6] = [
- [159, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
- [165, 145, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
- [173, 148, 140, 0, 0, 0, 0, 0, 0, 0, 0, 0],
- [176, 155, 140, 135, 0, 0, 0, 0, 0, 0, 0, 0],
- [180, 157, 141, 134, 130, 0, 0, 0, 0, 0, 0, 0],
- [254, 254, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0],
-];
-
-static DCT_CAT_BASE: [u8; 6] = [5, 7, 11, 19, 35, 67];
-static COEFF_BANDS: [u8; 16] = [0, 1, 2, 3, 6, 4, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7];
-
-#[rustfmt::skip]
-static DC_QUANT: [i16; 128] = [
- 4, 5, 6, 7, 8, 9, 10, 10,
- 11, 12, 13, 14, 15, 16, 17, 17,
- 18, 19, 20, 20, 21, 21, 22, 22,
- 23, 23, 24, 25, 25, 26, 27, 28,
- 29, 30, 31, 32, 33, 34, 35, 36,
- 37, 37, 38, 39, 40, 41, 42, 43,
- 44, 45, 46, 46, 47, 48, 49, 50,
- 51, 52, 53, 54, 55, 56, 57, 58,
- 59, 60, 61, 62, 63, 64, 65, 66,
- 67, 68, 69, 70, 71, 72, 73, 74,
- 75, 76, 76, 77, 78, 79, 80, 81,
- 82, 83, 84, 85, 86, 87, 88, 89,
- 91, 93, 95, 96, 98, 100, 101, 102,
- 104, 106, 108, 110, 112, 114, 116, 118,
- 122, 124, 126, 128, 130, 132, 134, 136,
- 138, 140, 143, 145, 148, 151, 154, 157,
-];
-
-#[rustfmt::skip]
-static AC_QUANT: [i16; 128] = [
- 4, 5, 6, 7, 8, 9, 10, 11,
- 12, 13, 14, 15, 16, 17, 18, 19,
- 20, 21, 22, 23, 24, 25, 26, 27,
- 28, 29, 30, 31, 32, 33, 34, 35,
- 36, 37, 38, 39, 40, 41, 42, 43,
- 44, 45, 46, 47, 48, 49, 50, 51,
- 52, 53, 54, 55, 56, 57, 58, 60,
- 62, 64, 66, 68, 70, 72, 74, 76,
- 78, 80, 82, 84, 86, 88, 90, 92,
- 94, 96, 98, 100, 102, 104, 106, 108,
- 110, 112, 114, 116, 119, 122, 125, 128,
- 131, 134, 137, 140, 143, 146, 149, 152,
- 155, 158, 161, 164, 167, 170, 173, 177,
- 181, 185, 189, 193, 197, 201, 205, 209,
- 213, 217, 221, 225, 229, 234, 239, 245,
- 249, 254, 259, 264, 269, 274, 279, 284,
-];
-
-static ZIGZAG: [u8; 16] = [0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15];
-
-/// All errors that can occur when attempting to parse a VP8 codec inside WebP
-#[derive(Debug, Clone, Copy)]
-enum DecoderError {
- /// VP8's `[0x9D, 0x01, 0x2A]` magic not found or invalid
- Vp8MagicInvalid([u8; 3]),
-
- /// Decoder initialisation wasn't provided with enough data
- NotEnoughInitData,
-
- /// At time of writing, only the YUV colour-space encoded as `0` is specified
- ColorSpaceInvalid(u8),
- /// LUMA prediction mode was not recognised
- LumaPredictionModeInvalid(i8),
- /// Intra-prediction mode was not recognised
- IntraPredictionModeInvalid(i8),
- /// Chroma prediction mode was not recognised
- ChromaPredictionModeInvalid(i8),
-}
-
-impl fmt::Display for DecoderError {
- fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
- match self {
- DecoderError::Vp8MagicInvalid(tag) => f.write_fmt(format_args!(
- "Invalid VP8 magic: [{:#04X?}, {:#04X?}, {:#04X?}]",
- tag[0], tag[1], tag[2]
- )),
-
- DecoderError::NotEnoughInitData => {
- f.write_str("Expected at least 2 bytes of VP8 decoder initialization data")
- }
-
- DecoderError::ColorSpaceInvalid(cs) => {
- f.write_fmt(format_args!("Invalid non-YUV VP8 color space {}", cs))
- }
- DecoderError::LumaPredictionModeInvalid(pm) => {
- f.write_fmt(format_args!("Invalid VP8 LUMA prediction mode {}", pm))
- }
- DecoderError::IntraPredictionModeInvalid(i) => {
- f.write_fmt(format_args!("Invalid VP8 intra-prediction mode {}", i))
- }
- DecoderError::ChromaPredictionModeInvalid(c) => {
- f.write_fmt(format_args!("Invalid VP8 chroma prediction mode {}", c))
- }
- }
- }
-}
-
-impl From<DecoderError> for ImageError {
- fn from(e: DecoderError) -> ImageError {
- ImageError::Decoding(DecodingError::new(ImageFormat::WebP.into(), e))
- }
-}
-
-impl error::Error for DecoderError {}
-
-struct BoolReader {
- buf: Vec<u8>,
- index: usize,
-
- range: u32,
- value: u32,
- bit_count: u8,
-}
-
-impl BoolReader {
- pub(crate) fn new() -> BoolReader {
- BoolReader {
- buf: Vec::new(),
- range: 0,
- value: 0,
- bit_count: 0,
- index: 0,
- }
- }
-
- pub(crate) fn init(&mut self, buf: Vec<u8>) -> ImageResult<()> {
- if buf.len() < 2 {
- return Err(DecoderError::NotEnoughInitData.into());
- }
-
- self.buf = buf;
- // Direct access safe, since length has just been validated.
- self.value = (u32::from(self.buf[0]) << 8) | u32::from(self.buf[1]);
- self.index = 2;
- self.range = 255;
- self.bit_count = 0;
-
- Ok(())
- }
-
- pub(crate) fn read_bool(&mut self, probability: u8) -> bool {
- let split = 1 + (((self.range - 1) * u32::from(probability)) >> 8);
- let bigsplit = split << 8;
-
- let retval = if self.value >= bigsplit {
- self.range -= split;
- self.value -= bigsplit;
- true
- } else {
- self.range = split;
- false
- };
-
- while self.range < 128 {
- self.value <<= 1;
- self.range <<= 1;
- self.bit_count += 1;
-
- if self.bit_count == 8 {
- self.bit_count = 0;
-
- // If no more bits are available, just don't do anything.
- // This strategy is suggested in the reference implementation of RFC6386 (p.135)
- if self.index < self.buf.len() {
- self.value |= u32::from(self.buf[self.index]);
- self.index += 1;
- }
- }
- }
-
- retval
- }
-
- pub(crate) fn read_literal(&mut self, n: u8) -> u8 {
- let mut v = 0u8;
- let mut n = n;
-
- while n != 0 {
- v = (v << 1) + self.read_bool(128u8) as u8;
- n -= 1;
- }
-
- v
- }
-
- pub(crate) fn read_magnitude_and_sign(&mut self, n: u8) -> i32 {
- let magnitude = self.read_literal(n);
- let sign = self.read_literal(1);
-
- if sign == 1 {
- -i32::from(magnitude)
- } else {
- i32::from(magnitude)
- }
- }
-
- pub(crate) fn read_with_tree(&mut self, tree: &[i8], probs: &[Prob], start: isize) -> i8 {
- let mut index = start;
-
- loop {
- let a = self.read_bool(probs[index as usize >> 1]);
- let b = index + a as isize;
- index = tree[b as usize] as isize;
-
- if index <= 0 {
- break;
- }
- }
-
- -index as i8
- }
-
- pub(crate) fn read_flag(&mut self) -> bool {
- 0 != self.read_literal(1)
- }
-}
-
-#[derive(Default, Clone, Copy)]
-struct MacroBlock {
- bpred: [IntraMode; 16],
- complexity: [u8; 9],
- luma_mode: LumaMode,
- chroma_mode: ChromaMode,
- segmentid: u8,
- coeffs_skipped: bool,
-}
-
-/// A Representation of the last decoded video frame
-#[derive(Default, Debug, Clone)]
-pub struct Frame {
- /// The width of the luma plane
- pub width: u16,
-
- /// The height of the luma plane
- pub height: u16,
-
- /// The luma plane of the frame
- pub ybuf: Vec<u8>,
-
- /// The blue plane of the frame
- pub ubuf: Vec<u8>,
-
- /// The red plane of the frame
- pub vbuf: Vec<u8>,
-
- /// Indicates whether this frame is a keyframe
- pub keyframe: bool,
-
- version: u8,
-
- /// Indicates whether this frame is intended for display
- pub for_display: bool,
-
- // Section 9.2
- /// The pixel type of the frame as defined by Section 9.2
- /// of the VP8 Specification
- pub pixel_type: u8,
-
- // Section 9.4 and 15
- filter_type: bool, //if true uses simple filter // if false uses normal filter
- filter_level: u8,
- sharpness_level: u8,
-}
-
-impl Frame {
- /// Chroma plane is half the size of the Luma plane
- fn chroma_width(&self) -> u16 {
- (self.width + 1) / 2
- }
-
- fn chroma_height(&self) -> u16 {
- (self.height + 1) / 2
- }
-
- /// Fills an rgb buffer with the image
- pub(crate) fn fill_rgb(&self, buf: &mut [u8]) {
- for (index, rgb_chunk) in (0..self.ybuf.len()).zip(buf.chunks_exact_mut(3)) {
- let y = index / self.width as usize;
- let x = index % self.width as usize;
- let chroma_index = self.chroma_width() as usize * (y / 2) + x / 2;
-
- Frame::fill_single(
- self.ybuf[index],
- self.ubuf[chroma_index],
- self.vbuf[chroma_index],
- rgb_chunk,
- );
- }
- }
-
- /// Fills an rgba buffer by skipping the alpha values
- pub(crate) fn fill_rgba(&self, buf: &mut [u8]) {
- for (index, rgba_chunk) in (0..self.ybuf.len()).zip(buf.chunks_exact_mut(4)) {
- let y = index / self.width as usize;
- let x = index % self.width as usize;
- let chroma_index = self.chroma_width() as usize * (y / 2) + x / 2;
-
- Frame::fill_single(
- self.ybuf[index],
- self.ubuf[chroma_index],
- self.vbuf[chroma_index],
- rgba_chunk,
- );
- }
- }
-
- /// Conversion values from https://docs.microsoft.com/en-us/windows/win32/medfound/recommended-8-bit-yuv-formats-for-video-rendering#converting-8-bit-yuv-to-rgb888
- fn fill_single(y: u8, u: u8, v: u8, rgb: &mut [u8]) {
- let c: i32 = i32::from(y) - 16;
- let d: i32 = i32::from(u) - 128;
- let e: i32 = i32::from(v) - 128;
-
- let r: u8 = clamp((298 * c + 409 * e + 128) >> 8, 0, 255)
- .try_into()
- .unwrap();
- let g: u8 = clamp((298 * c - 100 * d - 208 * e + 128) >> 8, 0, 255)
- .try_into()
- .unwrap();
- let b: u8 = clamp((298 * c + 516 * d + 128) >> 8, 0, 255)
- .try_into()
- .unwrap();
-
- rgb[0] = r;
- rgb[1] = g;
- rgb[2] = b;
- }
-
- /// Gets the buffer size
- pub fn get_buf_size(&self) -> usize {
- self.ybuf.len() * 3
- }
-}
-
-#[derive(Clone, Copy, Default)]
-struct Segment {
- ydc: i16,
- yac: i16,
-
- y2dc: i16,
- y2ac: i16,
-
- uvdc: i16,
- uvac: i16,
-
- delta_values: bool,
-
- quantizer_level: i8,
- loopfilter_level: i8,
-}
-
-/// VP8 Decoder
-///
-/// Only decodes keyframes
-pub struct Vp8Decoder<R> {
- r: R,
- b: BoolReader,
-
- mbwidth: u16,
- mbheight: u16,
- macroblocks: Vec<MacroBlock>,
-
- frame: Frame,
-
- segments_enabled: bool,
- segments_update_map: bool,
- segment: [Segment; MAX_SEGMENTS],
-
- ref_delta: [i32; 4],
- mode_delta: [i32; 4],
-
- partitions: [BoolReader; 8],
- num_partitions: u8,
-
- segment_tree_probs: [Prob; 3],
- token_probs: Box<TokenProbTables>,
-
- // Section 9.10
- prob_intra: Prob,
-
- // Section 9.11
- prob_skip_false: Option<Prob>,
-
- top: Vec<MacroBlock>,
- left: MacroBlock,
-
- top_border: Vec<u8>,
- left_border: Vec<u8>,
-}
-
-impl<R: Read> Vp8Decoder<R> {
- /// Create a new decoder.
- /// The reader must present a raw vp8 bitstream to the decoder
- pub fn new(r: R) -> Vp8Decoder<R> {
- let f = Frame::default();
- let s = Segment::default();
- let m = MacroBlock::default();
-
- Vp8Decoder {
- r,
- b: BoolReader::new(),
-
- mbwidth: 0,
- mbheight: 0,
- macroblocks: Vec::new(),
-
- frame: f,
- segments_enabled: false,
- segments_update_map: false,
- segment: [s; MAX_SEGMENTS],
-
- ref_delta: [0; 4],
- mode_delta: [0; 4],
-
- partitions: [
- BoolReader::new(),
- BoolReader::new(),
- BoolReader::new(),
- BoolReader::new(),
- BoolReader::new(),
- BoolReader::new(),
- BoolReader::new(),
- BoolReader::new(),
- ],
-
- num_partitions: 1,
-
- segment_tree_probs: [255u8; 3],
- token_probs: Box::new(COEFF_PROBS),
-
- // Section 9.10
- prob_intra: 0u8,
-
- // Section 9.11
- prob_skip_false: None,
-
- top: Vec::new(),
- left: m,
-
- top_border: Vec::new(),
- left_border: Vec::new(),
- }
- }
-
- fn update_token_probabilities(&mut self) {
- for (i, is) in COEFF_UPDATE_PROBS.iter().enumerate() {
- for (j, js) in is.iter().enumerate() {
- for (k, ks) in js.iter().enumerate() {
- for (t, prob) in ks.iter().enumerate().take(NUM_DCT_TOKENS - 1) {
- if self.b.read_bool(*prob) {
- let v = self.b.read_literal(8);
- self.token_probs[i][j][k][t] = v;
- }
- }
- }
- }
- }
- }
-
- fn init_partitions(&mut self, n: usize) -> ImageResult<()> {
- if n > 1 {
- let mut sizes = vec![0; 3 * n - 3];
- self.r.read_exact(sizes.as_mut_slice())?;
-
- for (i, s) in sizes.chunks(3).enumerate() {
- let size = { s }
- .read_u24::<LittleEndian>()
- .expect("Reading from &[u8] can't fail and the chunk is complete");
-
- let mut buf = vec![0; size as usize];
- self.r.read_exact(buf.as_mut_slice())?;
-
- self.partitions[i].init(buf)?;
- }
- }
-
- let mut buf = Vec::new();
- self.r.read_to_end(&mut buf)?;
- self.partitions[n - 1].init(buf)?;
-
- Ok(())
- }
-
- fn read_quantization_indices(&mut self) {
- fn dc_quant(index: i32) -> i16 {
- DC_QUANT[clamp(index, 0, 127) as usize]
- }
-
- fn ac_quant(index: i32) -> i16 {
- AC_QUANT[clamp(index, 0, 127) as usize]
- }
-
- let yac_abs = self.b.read_literal(7);
- let ydc_delta = if self.b.read_flag() {
- self.b.read_magnitude_and_sign(4)
- } else {
- 0
- };
-
- let y2dc_delta = if self.b.read_flag() {
- self.b.read_magnitude_and_sign(4)
- } else {
- 0
- };
-
- let y2ac_delta = if self.b.read_flag() {
- self.b.read_magnitude_and_sign(4)
- } else {
- 0
- };
-
- let uvdc_delta = if self.b.read_flag() {
- self.b.read_magnitude_and_sign(4)
- } else {
- 0
- };
-
- let uvac_delta = if self.b.read_flag() {
- self.b.read_magnitude_and_sign(4)
- } else {
- 0
- };
-
- let n = if self.segments_enabled {
- MAX_SEGMENTS
- } else {
- 1
- };
- for i in 0usize..n {
- let base = i32::from(if !self.segment[i].delta_values {
- i16::from(self.segment[i].quantizer_level)
- } else {
- i16::from(self.segment[i].quantizer_level) + i16::from(yac_abs)
- });
-
- self.segment[i].ydc = dc_quant(base + ydc_delta);
- self.segment[i].yac = ac_quant(base);
-
- self.segment[i].y2dc = dc_quant(base + y2dc_delta) * 2;
- // The intermediate result (max`284*155`) can be larger than the `i16` range.
- self.segment[i].y2ac = (i32::from(ac_quant(base + y2ac_delta)) * 155 / 100) as i16;
-
- self.segment[i].uvdc = dc_quant(base + uvdc_delta);
- self.segment[i].uvac = ac_quant(base + uvac_delta);
-
- if self.segment[i].y2ac < 8 {
- self.segment[i].y2ac = 8;
- }
-
- if self.segment[i].uvdc > 132 {
- self.segment[i].uvdc = 132;
- }
- }
- }
-
- fn read_loop_filter_adjustments(&mut self) {
- if self.b.read_flag() {
- for i in 0usize..4 {
- let ref_frame_delta_update_flag = self.b.read_flag();
-
- self.ref_delta[i] = if ref_frame_delta_update_flag {
- self.b.read_magnitude_and_sign(6)
- } else {
- 0i32
- };
- }
-
- for i in 0usize..4 {
- let mb_mode_delta_update_flag = self.b.read_flag();
-
- self.mode_delta[i] = if mb_mode_delta_update_flag {
- self.b.read_magnitude_and_sign(6)
- } else {
- 0i32
- };
- }
- }
- }
-
- fn read_segment_updates(&mut self) {
- // Section 9.3
- self.segments_update_map = self.b.read_flag();
- let update_segment_feature_data = self.b.read_flag();
-
- if update_segment_feature_data {
- let segment_feature_mode = self.b.read_flag();
-
- for i in 0usize..MAX_SEGMENTS {
- self.segment[i].delta_values = !segment_feature_mode;
- }
-
- for i in 0usize..MAX_SEGMENTS {
- let update = self.b.read_flag();
-
- self.segment[i].quantizer_level = if update {
- self.b.read_magnitude_and_sign(7)
- } else {
- 0i32
- } as i8;
- }
-
- for i in 0usize..MAX_SEGMENTS {
- let update = self.b.read_flag();
-
- self.segment[i].loopfilter_level = if update {
- self.b.read_magnitude_and_sign(6)
- } else {
- 0i32
- } as i8;
- }
- }
-
- if self.segments_update_map {
- for i in 0usize..3 {
- let update = self.b.read_flag();
-
- self.segment_tree_probs[i] = if update { self.b.read_literal(8) } else { 255 };
- }
- }
- }
-
- fn read_frame_header(&mut self) -> ImageResult<()> {
- let tag = self.r.read_u24::<LittleEndian>()?;
-
- self.frame.keyframe = tag & 1 == 0;
- self.frame.version = ((tag >> 1) & 7) as u8;
- self.frame.for_display = (tag >> 4) & 1 != 0;
-
- let first_partition_size = tag >> 5;
-
- if self.frame.keyframe {
- let mut tag = [0u8; 3];
- self.r.read_exact(&mut tag)?;
-
- if tag != [0x9d, 0x01, 0x2a] {
- return Err(DecoderError::Vp8MagicInvalid(tag).into());
- }
-
- let w = self.r.read_u16::<LittleEndian>()?;
- let h = self.r.read_u16::<LittleEndian>()?;
-
- self.frame.width = w & 0x3FFF;
- self.frame.height = h & 0x3FFF;
-
- self.top = init_top_macroblocks(self.frame.width as usize);
- // Almost always the first macro block, except when non exists (i.e. `width == 0`)
- self.left = self.top.get(0).cloned().unwrap_or_default();
-
- self.mbwidth = (self.frame.width + 15) / 16;
- self.mbheight = (self.frame.height + 15) / 16;
-
- self.frame.ybuf = vec![0u8; self.frame.width as usize * self.frame.height as usize];
- self.frame.ubuf =
- vec![0u8; self.frame.chroma_width() as usize * self.frame.chroma_height() as usize];
- self.frame.vbuf =
- vec![0u8; self.frame.chroma_width() as usize * self.frame.chroma_height() as usize];
-
- self.top_border = vec![127u8; self.frame.width as usize + 4 + 16];
- self.left_border = vec![129u8; 1 + 16];
- }
-
- let mut buf = vec![0; first_partition_size as usize];
- self.r.read_exact(&mut buf)?;
-
- // initialise binary decoder
- self.b.init(buf)?;
-
- if self.frame.keyframe {
- let color_space = self.b.read_literal(1);
- self.frame.pixel_type = self.b.read_literal(1);
-
- if color_space != 0 {
- return Err(DecoderError::ColorSpaceInvalid(color_space).into());
- }
- }
-
- self.segments_enabled = self.b.read_flag();
- if self.segments_enabled {
- self.read_segment_updates();
- }
-
- self.frame.filter_type = self.b.read_flag();
- self.frame.filter_level = self.b.read_literal(6);
- self.frame.sharpness_level = self.b.read_literal(3);
-
- let lf_adjust_enable = self.b.read_flag();
- if lf_adjust_enable {
- self.read_loop_filter_adjustments();
- }
-
- self.num_partitions = (1usize << self.b.read_literal(2) as usize) as u8;
- let num_partitions = self.num_partitions as usize;
- self.init_partitions(num_partitions)?;
-
- self.read_quantization_indices();
-
- if !self.frame.keyframe {
- // 9.7 refresh golden frame and altref frame
- // FIXME: support this?
- return Err(ImageError::Unsupported(
- UnsupportedError::from_format_and_kind(
- ImageFormat::WebP.into(),
- UnsupportedErrorKind::GenericFeature("Non-keyframe frames".to_owned()),
- ),
- ));
- } else {
- // Refresh entropy probs ?????
- let _ = self.b.read_literal(1);
- }
-
- self.update_token_probabilities();
-
- let mb_no_skip_coeff = self.b.read_literal(1);
- self.prob_skip_false = if mb_no_skip_coeff == 1 {
- Some(self.b.read_literal(8))
- } else {
- None
- };
-
- if !self.frame.keyframe {
- // 9.10 remaining frame data
- self.prob_intra = 0;
-
- // FIXME: support this?
- return Err(ImageError::Unsupported(
- UnsupportedError::from_format_and_kind(
- ImageFormat::WebP.into(),
- UnsupportedErrorKind::GenericFeature("Non-keyframe frames".to_owned()),
- ),
- ));
- } else {
- // Reset motion vectors
- }
-
- Ok(())
- }
-
- fn read_macroblock_header(&mut self, mbx: usize) -> ImageResult<MacroBlock> {
- let mut mb = MacroBlock::default();
-
- if self.segments_enabled && self.segments_update_map {
- mb.segmentid = self
- .b
- .read_with_tree(&SEGMENT_ID_TREE, &self.segment_tree_probs, 0)
- as u8;
- };
-
- mb.coeffs_skipped = if self.prob_skip_false.is_some() {
- self.b.read_bool(*self.prob_skip_false.as_ref().unwrap())
- } else {
- false
- };
-
- let inter_predicted = if !self.frame.keyframe {
- self.b.read_bool(self.prob_intra)
- } else {
- false
- };
-
- if inter_predicted {
- return Err(ImageError::Unsupported(
- UnsupportedError::from_format_and_kind(
- ImageFormat::WebP.into(),
- UnsupportedErrorKind::GenericFeature("VP8 inter-prediction".to_owned()),
- ),
- ));
- }
-
- if self.frame.keyframe {
- // intra prediction
- let luma = self
- .b
- .read_with_tree(&KEYFRAME_YMODE_TREE, &KEYFRAME_YMODE_PROBS, 0);
- mb.luma_mode =
- LumaMode::from_i8(luma).ok_or(DecoderError::LumaPredictionModeInvalid(luma))?;
-
- match mb.luma_mode.into_intra() {
- // `LumaMode::B` - This is predicted individually
- None => {
- for y in 0usize..4 {
- for x in 0usize..4 {
- let top = self.top[mbx].bpred[12 + x];
- let left = self.left.bpred[y];
- let intra = self.b.read_with_tree(
- &KEYFRAME_BPRED_MODE_TREE,
- &KEYFRAME_BPRED_MODE_PROBS[top as usize][left as usize],
- 0,
- );
- let bmode = IntraMode::from_i8(intra)
- .ok_or(DecoderError::IntraPredictionModeInvalid(intra))?;
- mb.bpred[x + y * 4] = bmode;
-
- self.top[mbx].bpred[12 + x] = bmode;
- self.left.bpred[y] = bmode;
- }
- }
- }
- Some(mode) => {
- for i in 0usize..4 {
- mb.bpred[12 + i] = mode;
- self.left.bpred[i] = mode;
- }
- }
- }
-
- let chroma = self
- .b
- .read_with_tree(&KEYFRAME_UV_MODE_TREE, &KEYFRAME_UV_MODE_PROBS, 0);
- mb.chroma_mode = ChromaMode::from_i8(chroma)
- .ok_or(DecoderError::ChromaPredictionModeInvalid(chroma))?;
- }
-
- self.top[mbx].chroma_mode = mb.chroma_mode;
- self.top[mbx].luma_mode = mb.luma_mode;
- self.top[mbx].bpred = mb.bpred;
-
- Ok(mb)
- }
-
- fn intra_predict_luma(&mut self, mbx: usize, mby: usize, mb: &MacroBlock, resdata: &[i32]) {
- let stride = 1usize + 16 + 4;
- let w = self.frame.width as usize;
- let mw = self.mbwidth as usize;
- let mut ws = create_border_luma(mbx, mby, mw, &self.top_border, &self.left_border);
-
- match mb.luma_mode {
- LumaMode::V => predict_vpred(&mut ws, 16, 1, 1, stride),
- LumaMode::H => predict_hpred(&mut ws, 16, 1, 1, stride),
- LumaMode::TM => predict_tmpred(&mut ws, 16, 1, 1, stride),
- LumaMode::DC => predict_dcpred(&mut ws, 16, stride, mby != 0, mbx != 0),
- LumaMode::B => predict_4x4(&mut ws, stride, &mb.bpred, resdata),
- }
-
- if mb.luma_mode != LumaMode::B {
- for y in 0usize..4 {
- for x in 0usize..4 {
- let i = x + y * 4;
- // Create a reference to a [i32; 16] array for add_residue (slices of size 16 do not work).
- let rb: &[i32; 16] = resdata[i * 16..][..16].try_into().unwrap();
- let y0 = 1 + y * 4;
- let x0 = 1 + x * 4;
-
- add_residue(&mut ws, rb, y0, x0, stride);
- }
- }
- }
-
- self.left_border[0] = ws[16];
-
- for i in 0usize..16 {
- self.top_border[mbx * 16 + i] = ws[16 * stride + 1 + i];
- self.left_border[i + 1] = ws[(i + 1) * stride + 16];
- }
-
- // Length is the remainder to the border, but maximally the current chunk.
- let ylength = cmp::min(self.frame.height as usize - mby * 16, 16);
- let xlength = cmp::min(self.frame.width as usize - mbx * 16, 16);
-
- for y in 0usize..ylength {
- for x in 0usize..xlength {
- self.frame.ybuf[(mby * 16 + y) * w + mbx * 16 + x] = ws[(1 + y) * stride + 1 + x];
- }
- }
- }
-
- fn intra_predict_chroma(&mut self, mbx: usize, mby: usize, mb: &MacroBlock, resdata: &[i32]) {
- let stride = 1usize + 8;
-
- let w = self.frame.chroma_width() as usize;
-
- //8x8 with left top border of 1
- let mut uws = [0u8; (8 + 1) * (8 + 1)];
- let mut vws = [0u8; (8 + 1) * (8 + 1)];
-
- let ylength = cmp::min(self.frame.chroma_height() as usize - mby * 8, 8);
- let xlength = cmp::min(self.frame.chroma_width() as usize - mbx * 8, 8);
-
- //left border
- for y in 0usize..8 {
- let (uy, vy) = if mbx == 0 || y >= ylength {
- (129, 129)
- } else {
- let index = (mby * 8 + y) * w + ((mbx - 1) * 8 + 7);
- (self.frame.ubuf[index], self.frame.vbuf[index])
- };
-
- uws[(y + 1) * stride] = uy;
- vws[(y + 1) * stride] = vy;
- }
- //top border
- for x in 0usize..8 {
- let (ux, vx) = if mby == 0 || x >= xlength {
- (127, 127)
- } else {
- let index = ((mby - 1) * 8 + 7) * w + (mbx * 8 + x);
- (self.frame.ubuf[index], self.frame.vbuf[index])
- };
-
- uws[x + 1] = ux;
- vws[x + 1] = vx;
- }
-
- //top left point
- let (u1, v1) = if mby == 0 {
- (127, 127)
- } else if mbx == 0 {
- (129, 129)
- } else {
- let index = ((mby - 1) * 8 + 7) * w + (mbx - 1) * 8 + 7;
- if index >= self.frame.ubuf.len() {
- (127, 127)
- } else {
- (self.frame.ubuf[index], self.frame.vbuf[index])
- }
- };
-
- uws[0] = u1;
- vws[0] = v1;
-
- match mb.chroma_mode {
- ChromaMode::DC => {
- predict_dcpred(&mut uws, 8, stride, mby != 0, mbx != 0);
- predict_dcpred(&mut vws, 8, stride, mby != 0, mbx != 0);
- }
- ChromaMode::V => {
- predict_vpred(&mut uws, 8, 1, 1, stride);
- predict_vpred(&mut vws, 8, 1, 1, stride);
- }
- ChromaMode::H => {
- predict_hpred(&mut uws, 8, 1, 1, stride);
- predict_hpred(&mut vws, 8, 1, 1, stride);
- }
- ChromaMode::TM => {
- predict_tmpred(&mut uws, 8, 1, 1, stride);
- predict_tmpred(&mut vws, 8, 1, 1, stride);
- }
- }
-
- for y in 0usize..2 {
- for x in 0usize..2 {
- let i = x + y * 2;
- let urb: &[i32; 16] = resdata[16 * 16 + i * 16..][..16].try_into().unwrap();
-
- let y0 = 1 + y * 4;
- let x0 = 1 + x * 4;
- add_residue(&mut uws, urb, y0, x0, stride);
-
- let vrb: &[i32; 16] = resdata[20 * 16 + i * 16..][..16].try_into().unwrap();
-
- add_residue(&mut vws, vrb, y0, x0, stride);
- }
- }
-
- for y in 0usize..ylength {
- for x in 0usize..xlength {
- self.frame.ubuf[(mby * 8 + y) * w + mbx * 8 + x] = uws[(1 + y) * stride + 1 + x];
- self.frame.vbuf[(mby * 8 + y) * w + mbx * 8 + x] = vws[(1 + y) * stride + 1 + x];
- }
- }
- }
-
- fn read_coefficients(
- &mut self,
- block: &mut [i32],
- p: usize,
- plane: usize,
- complexity: usize,
- dcq: i16,
- acq: i16,
- ) -> bool {
- let first = if plane == 0 { 1usize } else { 0usize };
- let probs = &self.token_probs[plane];
- let tree = &DCT_TOKEN_TREE;
-
- let mut complexity = complexity;
- let mut has_coefficients = false;
- let mut skip = false;
-
- for i in first..16usize {
- let table = &probs[COEFF_BANDS[i] as usize][complexity];
-
- let token = if !skip {
- self.partitions[p].read_with_tree(tree, table, 0)
- } else {
- self.partitions[p].read_with_tree(tree, table, 2)
- };
-
- let mut abs_value = i32::from(match token {
- DCT_EOB => break,
-
- DCT_0 => {
- skip = true;
- has_coefficients = true;
- complexity = 0;
- continue;
- }
-
- literal @ DCT_1..=DCT_4 => i16::from(literal),
-
- category @ DCT_CAT1..=DCT_CAT6 => {
- let t = PROB_DCT_CAT[(category - DCT_CAT1) as usize];
-
- let mut extra = 0i16;
- let mut j = 0;
-
- while t[j] > 0 {
- extra = extra + extra + self.partitions[p].read_bool(t[j]) as i16;
- j += 1;
- }
-
- i16::from(DCT_CAT_BASE[(category - DCT_CAT1) as usize]) + extra
- }
-
- c => panic!("unknown token: {}", c),
- });
-
- skip = false;
-
- complexity = if abs_value == 0 {
- 0
- } else if abs_value == 1 {
- 1
- } else {
- 2
- };
-
- if self.partitions[p].read_bool(128) {
- abs_value = -abs_value;
- }
-
- block[ZIGZAG[i] as usize] =
- abs_value * i32::from(if ZIGZAG[i] > 0 { acq } else { dcq });
-
- has_coefficients = true;
- }
-
- has_coefficients
- }
-
- fn read_residual_data(&mut self, mb: &MacroBlock, mbx: usize, p: usize) -> [i32; 384] {
- let sindex = mb.segmentid as usize;
- let mut blocks = [0i32; 384];
- let mut plane = if mb.luma_mode == LumaMode::B { 3 } else { 1 };
-
- if plane == 1 {
- let complexity = self.top[mbx].complexity[0] + self.left.complexity[0];
- let mut block = [0i32; 16];
- let dcq = self.segment[sindex].y2dc;
- let acq = self.segment[sindex].y2ac;
- let n = self.read_coefficients(&mut block, p, plane, complexity as usize, dcq, acq);
-
- self.left.complexity[0] = if n { 1 } else { 0 };
- self.top[mbx].complexity[0] = if n { 1 } else { 0 };
-
- transform::iwht4x4(&mut block);
-
- for k in 0usize..16 {
- blocks[16 * k] = block[k];
- }
-
- plane = 0;
- }
-
- for y in 0usize..4 {
- let mut left = self.left.complexity[y + 1];
- for x in 0usize..4 {
- let i = x + y * 4;
- let block = &mut blocks[i * 16..i * 16 + 16];
-
- let complexity = self.top[mbx].complexity[x + 1] + left;
- let dcq = self.segment[sindex].ydc;
- let acq = self.segment[sindex].yac;
-
- let n = self.read_coefficients(block, p, plane, complexity as usize, dcq, acq);
-
- if block[0] != 0 || n {
- transform::idct4x4(block);
- }
-
- left = if n { 1 } else { 0 };
- self.top[mbx].complexity[x + 1] = if n { 1 } else { 0 };
- }
-
- self.left.complexity[y + 1] = left;
- }
-
- plane = 2;
-
- for &j in &[5usize, 7usize] {
- for y in 0usize..2 {
- let mut left = self.left.complexity[y + j];
-
- for x in 0usize..2 {
- let i = x + y * 2 + if j == 5 { 16 } else { 20 };
- let block = &mut blocks[i * 16..i * 16 + 16];
-
- let complexity = self.top[mbx].complexity[x + j] + left;
- let dcq = self.segment[sindex].uvdc;
- let acq = self.segment[sindex].uvac;
-
- let n = self.read_coefficients(block, p, plane, complexity as usize, dcq, acq);
- if block[0] != 0 || n {
- transform::idct4x4(block);
- }
-
- left = if n { 1 } else { 0 };
- self.top[mbx].complexity[x + j] = if n { 1 } else { 0 };
- }
-
- self.left.complexity[y + j] = left;
- }
- }
-
- blocks
- }
-
- /// Does loop filtering on the macroblock
- fn loop_filter(&mut self, mbx: usize, mby: usize, mb: &MacroBlock) {
- let luma_w = self.frame.width as usize;
- let luma_h = self.frame.height as usize;
- let chroma_w = self.frame.chroma_width() as usize;
- let chroma_h = self.frame.chroma_height() as usize;
-
- let (filter_level, interior_limit, hev_threshold) = self.calculate_filter_parameters(mb);
-
- if filter_level > 0 {
- let mbedge_limit = (filter_level + 2) * 2 + interior_limit;
- let sub_bedge_limit = (filter_level * 2) + interior_limit;
-
- let luma_ylength = cmp::min(luma_h - 16 * mby, 16);
- let luma_xlength = cmp::min(luma_w - 16 * mbx, 16);
-
- let chroma_ylength = cmp::min(chroma_h - 8 * mby, 8);
- let chroma_xlength = cmp::min(chroma_w - 8 * mbx, 8);
-
- //filter across left of macroblock
- if mbx > 0 {
- //simple loop filtering
- if self.frame.filter_type {
- if luma_xlength >= 2 {
- for y in 0usize..luma_ylength {
- let y0 = mby * 16 + y;
- let x0 = mbx * 16;
-
- loop_filter::simple_segment(
- mbedge_limit,
- &mut self.frame.ybuf[..],
- y0 * luma_w + x0,
- 1,
- );
- }
- }
- } else {
- if luma_xlength >= 4 {
- for y in 0usize..luma_ylength {
- let y0 = mby * 16 + y;
- let x0 = mbx * 16;
-
- loop_filter::macroblock_filter(
- hev_threshold,
- interior_limit,
- mbedge_limit,
- &mut self.frame.ybuf[..],
- y0 * luma_w + x0,
- 1,
- );
- }
- }
-
- if chroma_xlength >= 4 {
- for y in 0usize..chroma_ylength {
- let y0 = mby * 8 + y;
- let x0 = mbx * 8;
-
- loop_filter::macroblock_filter(
- hev_threshold,
- interior_limit,
- mbedge_limit,
- &mut self.frame.ubuf[..],
- y0 * chroma_w + x0,
- 1,
- );
- loop_filter::macroblock_filter(
- hev_threshold,
- interior_limit,
- mbedge_limit,
- &mut self.frame.vbuf[..],
- y0 * chroma_w + x0,
- 1,
- );
- }
- }
- }
- }
-
- //filter across vertical subblocks in macroblock
- if mb.luma_mode == LumaMode::B || !mb.coeffs_skipped {
- if self.frame.filter_type {
- for x in (4usize..luma_xlength - 1).step_by(4) {
- for y in 0..luma_ylength {
- let y0 = mby * 16 + y;
- let x0 = mbx * 16 + x;
-
- loop_filter::simple_segment(
- sub_bedge_limit,
- &mut self.frame.ybuf[..],
- y0 * luma_w + x0,
- 1,
- );
- }
- }
- } else {
- if luma_xlength > 3 {
- for x in (4usize..luma_xlength - 3).step_by(4) {
- for y in 0..luma_ylength {
- let y0 = mby * 16 + y;
- let x0 = mbx * 16 + x;
-
- loop_filter::subblock_filter(
- hev_threshold,
- interior_limit,
- sub_bedge_limit,
- &mut self.frame.ybuf[..],
- y0 * luma_w + x0,
- 1,
- );
- }
- }
- }
-
- if chroma_xlength == 8 {
- for y in 0usize..chroma_ylength {
- let y0 = mby * 8 + y;
- let x0 = mbx * 8 + 4;
-
- loop_filter::subblock_filter(
- hev_threshold,
- interior_limit,
- sub_bedge_limit,
- &mut self.frame.ubuf[..],
- y0 * chroma_w + x0,
- 1,
- );
-
- loop_filter::subblock_filter(
- hev_threshold,
- interior_limit,
- sub_bedge_limit,
- &mut self.frame.vbuf[..],
- y0 * chroma_w + x0,
- 1,
- );
- }
- }
- }
- }
-
- //filter across top of macroblock
- if mby > 0 {
- if self.frame.filter_type {
- if luma_ylength >= 2 {
- for x in 0usize..luma_xlength {
- let y0 = mby * 16;
- let x0 = mbx * 16 + x;
-
- loop_filter::simple_segment(
- mbedge_limit,
- &mut self.frame.ybuf[..],
- y0 * luma_w + x0,
- luma_w,
- );
- }
- }
- } else {
- //if bottom macroblock, can only filter if there is 3 pixels below
- if luma_ylength >= 4 {
- for x in 0usize..luma_xlength {
- let y0 = mby * 16;
- let x0 = mbx * 16 + x;
-
- loop_filter::macroblock_filter(
- hev_threshold,
- interior_limit,
- mbedge_limit,
- &mut self.frame.ybuf[..],
- y0 * luma_w + x0,
- luma_w,
- );
- }
- }
-
- if chroma_ylength >= 4 {
- for x in 0usize..chroma_xlength {
- let y0 = mby * 8;
- let x0 = mbx * 8 + x;
-
- loop_filter::macroblock_filter(
- hev_threshold,
- interior_limit,
- mbedge_limit,
- &mut self.frame.ubuf[..],
- y0 * chroma_w + x0,
- chroma_w,
- );
- loop_filter::macroblock_filter(
- hev_threshold,
- interior_limit,
- mbedge_limit,
- &mut self.frame.vbuf[..],
- y0 * chroma_w + x0,
- chroma_w,
- );
- }
- }
- }
- }
-
- //filter across horizontal subblock edges within the macroblock
- if mb.luma_mode == LumaMode::B || !mb.coeffs_skipped {
- if self.frame.filter_type {
- for y in (4usize..luma_ylength - 1).step_by(4) {
- for x in 0..luma_xlength {
- let y0 = mby * 16 + y;
- let x0 = mbx * 16 + x;
-
- loop_filter::simple_segment(
- sub_bedge_limit,
- &mut self.frame.ybuf[..],
- y0 * luma_w + x0,
- luma_w,
- );
- }
- }
- } else {
- if luma_ylength > 3 {
- for y in (4usize..luma_ylength - 3).step_by(4) {
- for x in 0..luma_xlength {
- let y0 = mby * 16 + y;
- let x0 = mbx * 16 + x;
-
- loop_filter::subblock_filter(
- hev_threshold,
- interior_limit,
- sub_bedge_limit,
- &mut self.frame.ybuf[..],
- y0 * luma_w + x0,
- luma_w,
- );
- }
- }
- }
-
- if chroma_ylength == 8 {
- for x in 0..chroma_xlength {
- let y0 = mby * 8 + 4;
- let x0 = mbx * 8 + x;
-
- loop_filter::subblock_filter(
- hev_threshold,
- interior_limit,
- sub_bedge_limit,
- &mut self.frame.ubuf[..],
- y0 * chroma_w + x0,
- chroma_w,
- );
-
- loop_filter::subblock_filter(
- hev_threshold,
- interior_limit,
- sub_bedge_limit,
- &mut self.frame.vbuf[..],
- y0 * chroma_w + x0,
- chroma_w,
- );
- }
- }
- }
- }
- }
- }
-
- //return values are the filter level, interior limit and hev threshold
- fn calculate_filter_parameters(&self, macroblock: &MacroBlock) -> (u8, u8, u8) {
- let segment = self.segment[macroblock.segmentid as usize];
- let mut filter_level = self.frame.filter_level as i32;
-
- if self.segments_enabled {
- if segment.delta_values {
- filter_level += i32::from(segment.loopfilter_level);
- } else {
- filter_level = i32::from(segment.loopfilter_level);
- }
- }
-
- filter_level = clamp(filter_level, 0, 63);
-
- if macroblock.luma_mode == LumaMode::B {
- filter_level += self.mode_delta[0];
- }
-
- let filter_level = clamp(filter_level, 0, 63) as u8;
-
- //interior limit
- let mut interior_limit = filter_level;
-
- if self.frame.sharpness_level > 0 {
- interior_limit >>= if self.frame.sharpness_level > 4 { 2 } else { 1 };
-
- if interior_limit > 9 - self.frame.sharpness_level {
- interior_limit = 9 - self.frame.sharpness_level;
- }
- }
-
- if interior_limit == 0 {
- interior_limit = 1;
- }
-
- //high edge variance threshold
- let mut hev_threshold = 0;
-
- #[allow(clippy::collapsible_else_if)]
- if self.frame.keyframe {
- if filter_level >= 40 {
- hev_threshold = 2;
- } else {
- hev_threshold = 1;
- }
- } else {
- if filter_level >= 40 {
- hev_threshold = 3;
- } else if filter_level >= 20 {
- hev_threshold = 2;
- } else if filter_level >= 15 {
- hev_threshold = 1;
- }
- }
-
- (filter_level, interior_limit, hev_threshold)
- }
-
- /// Decodes the current frame
- pub fn decode_frame(&mut self) -> ImageResult<&Frame> {
- self.read_frame_header()?;
-
- for mby in 0..self.mbheight as usize {
- let p = mby % self.num_partitions as usize;
- self.left = MacroBlock::default();
-
- for mbx in 0..self.mbwidth as usize {
- let mb = self.read_macroblock_header(mbx)?;
- let blocks = if !mb.coeffs_skipped {
- self.read_residual_data(&mb, mbx, p)
- } else {
- if mb.luma_mode != LumaMode::B {
- self.left.complexity[0] = 0;
- self.top[mbx].complexity[0] = 0;
- }
-
- for i in 1usize..9 {
- self.left.complexity[i] = 0;
- self.top[mbx].complexity[i] = 0;
- }
-
- [0i32; 384]
- };
-
- self.intra_predict_luma(mbx, mby, &mb, &blocks);
- self.intra_predict_chroma(mbx, mby, &mb, &blocks);
-
- self.macroblocks.push(mb);
- }
-
- self.left_border = vec![129u8; 1 + 16];
- }
-
- //do loop filtering
- for mby in 0..self.mbheight as usize {
- for mbx in 0..self.mbwidth as usize {
- let mb = self.macroblocks[mby * self.mbwidth as usize + mbx];
- self.loop_filter(mbx, mby, &mb);
- }
- }
-
- Ok(&self.frame)
- }
-}
-
-impl LumaMode {
- fn from_i8(val: i8) -> Option<Self> {
- Some(match val {
- DC_PRED => LumaMode::DC,
- V_PRED => LumaMode::V,
- H_PRED => LumaMode::H,
- TM_PRED => LumaMode::TM,
- B_PRED => LumaMode::B,
- _ => return None,
- })
- }
-
- fn into_intra(self) -> Option<IntraMode> {
- Some(match self {
- LumaMode::DC => IntraMode::DC,
- LumaMode::V => IntraMode::VE,
- LumaMode::H => IntraMode::HE,
- LumaMode::TM => IntraMode::TM,
- LumaMode::B => return None,
- })
- }
-}
-
-impl Default for LumaMode {
- fn default() -> Self {
- LumaMode::DC
- }
-}
-
-impl ChromaMode {
- fn from_i8(val: i8) -> Option<Self> {
- Some(match val {
- DC_PRED => ChromaMode::DC,
- V_PRED => ChromaMode::V,
- H_PRED => ChromaMode::H,
- TM_PRED => ChromaMode::TM,
- _ => return None,
- })
- }
-}
-
-impl Default for ChromaMode {
- fn default() -> Self {
- ChromaMode::DC
- }
-}
-
-impl IntraMode {
- fn from_i8(val: i8) -> Option<Self> {
- Some(match val {
- B_DC_PRED => IntraMode::DC,
- B_TM_PRED => IntraMode::TM,
- B_VE_PRED => IntraMode::VE,
- B_HE_PRED => IntraMode::HE,
- B_LD_PRED => IntraMode::LD,
- B_RD_PRED => IntraMode::RD,
- B_VR_PRED => IntraMode::VR,
- B_VL_PRED => IntraMode::VL,
- B_HD_PRED => IntraMode::HD,
- B_HU_PRED => IntraMode::HU,
- _ => return None,
- })
- }
-}
-
-impl Default for IntraMode {
- fn default() -> Self {
- IntraMode::DC
- }
-}
-
-fn init_top_macroblocks(width: usize) -> Vec<MacroBlock> {
- let mb_width = (width + 15) / 16;
-
- let mb = MacroBlock {
- // Section 11.3 #3
- bpred: [IntraMode::DC; 16],
- luma_mode: LumaMode::DC,
- ..MacroBlock::default()
- };
-
- vec![mb; mb_width]
-}
-
-fn create_border_luma(mbx: usize, mby: usize, mbw: usize, top: &[u8], left: &[u8]) -> [u8; 357] {
- let stride = 1usize + 16 + 4;
- let mut ws = [0u8; (1 + 16) * (1 + 16 + 4)];
-
- // A
- {
- let above = &mut ws[1..stride];
- if mby == 0 {
- for above in above.iter_mut() {
- *above = 127;
- }
- } else {
- for i in 0usize..16 {
- above[i] = top[mbx * 16 + i];
- }
-
- if mbx == mbw - 1 {
- for above in above.iter_mut().skip(16) {
- *above = top[mbx * 16 + 15];
- }
- } else {
- for i in 16usize..above.len() {
- above[i] = top[mbx * 16 + i];
- }
- }
- }
- }
-
- for i in 17usize..stride {
- ws[4 * stride + i] = ws[i];
- ws[8 * stride + i] = ws[i];
- ws[12 * stride + i] = ws[i];
- }
-
- // L
- if mbx == 0 {
- for i in 0usize..16 {
- ws[(i + 1) * stride] = 129;
- }
- } else {
- for i in 0usize..16 {
- ws[(i + 1) * stride] = left[i + 1];
- }
- }
-
- // P
- ws[0] = if mby == 0 {
- 127
- } else if mbx == 0 {
- 129
- } else {
- left[0]
- };
-
- ws
-}
-
-fn avg3(left: u8, this: u8, right: u8) -> u8 {
- let avg = (u16::from(left) + 2 * u16::from(this) + u16::from(right) + 2) >> 2;
- avg as u8
-}
-
-fn avg2(this: u8, right: u8) -> u8 {
- let avg = (u16::from(this) + u16::from(right) + 1) >> 1;
- avg as u8
-}
-
-// Only 16 elements from rblock are used to add residue, so it is restricted to 16 elements
-// to enable SIMD and other optimizations.
-fn add_residue(pblock: &mut [u8], rblock: &[i32; 16], y0: usize, x0: usize, stride: usize) {
- let mut pos = y0 * stride + x0;
- for row in rblock.chunks(4) {
- for (p, &a) in pblock[pos..pos + 4].iter_mut().zip(row.iter()) {
- *p = clamp(a + i32::from(*p), 0, 255) as u8;
- }
- pos += stride;
- }
-}
-
-fn predict_4x4(ws: &mut [u8], stride: usize, modes: &[IntraMode], resdata: &[i32]) {
- for sby in 0usize..4 {
- for sbx in 0usize..4 {
- let i = sbx + sby * 4;
- let y0 = sby * 4 + 1;
- let x0 = sbx * 4 + 1;
-
- match modes[i] {
- IntraMode::TM => predict_tmpred(ws, 4, x0, y0, stride),
- IntraMode::VE => predict_bvepred(ws, x0, y0, stride),
- IntraMode::HE => predict_bhepred(ws, x0, y0, stride),
- IntraMode::DC => predict_bdcpred(ws, x0, y0, stride),
- IntraMode::LD => predict_bldpred(ws, x0, y0, stride),
- IntraMode::RD => predict_brdpred(ws, x0, y0, stride),
- IntraMode::VR => predict_bvrpred(ws, x0, y0, stride),
- IntraMode::VL => predict_bvlpred(ws, x0, y0, stride),
- IntraMode::HD => predict_bhdpred(ws, x0, y0, stride),
- IntraMode::HU => predict_bhupred(ws, x0, y0, stride),
- }
-
- let rb: &[i32; 16] = resdata[i * 16..][..16].try_into().unwrap();
- add_residue(ws, rb, y0, x0, stride);
- }
- }
-}
-
-fn predict_vpred(a: &mut [u8], size: usize, x0: usize, y0: usize, stride: usize) {
- for y in 0usize..size {
- for x in 0usize..size {
- a[(x + x0) + stride * (y + y0)] = a[(x + x0) + stride * (y0 + y - 1)];
- }
- }
-}
-
-fn predict_hpred(a: &mut [u8], size: usize, x0: usize, y0: usize, stride: usize) {
- for y in 0usize..size {
- for x in 0usize..size {
- a[(x + x0) + stride * (y + y0)] = a[(x + x0 - 1) + stride * (y0 + y)];
- }
- }
-}
-
-fn predict_dcpred(a: &mut [u8], size: usize, stride: usize, above: bool, left: bool) {
- let mut sum = 0;
- let mut shf = if size == 8 { 2 } else { 3 };
-
- if left {
- for y in 0usize..size {
- sum += u32::from(a[(y + 1) * stride]);
- }
-
- shf += 1;
- }
-
- if above {
- for x in 0usize..size {
- sum += u32::from(a[x + 1]);
- }
-
- shf += 1;
- }
-
- let dcval = if !left && !above {
- 128
- } else {
- (sum + (1 << (shf - 1))) >> shf
- };
-
- for y in 0usize..size {
- for x in 0usize..size {
- a[(x + 1) + stride * (y + 1)] = dcval as u8;
- }
- }
-}
-
-fn predict_tmpred(a: &mut [u8], size: usize, x0: usize, y0: usize, stride: usize) {
- for y in 0usize..size {
- for x in 0usize..size {
- let pred = i32::from(a[(y0 + y) * stride + x0 - 1])
- + i32::from(a[(y0 - 1) * stride + x0 + x])
- - i32::from(a[(y0 - 1) * stride + x0 - 1]);
-
- a[(x + x0) + stride * (y + y0)] = clamp(pred, 0, 255) as u8;
- }
- }
-}
-
-fn predict_bdcpred(a: &mut [u8], x0: usize, y0: usize, stride: usize) {
- let mut v = 4;
- for i in 0usize..4 {
- v += u32::from(a[(y0 + i) * stride + x0 - 1]) + u32::from(a[(y0 - 1) * stride + x0 + i]);
- }
-
- v >>= 3;
- for y in 0usize..4 {
- for x in 0usize..4 {
- a[x + x0 + stride * (y + y0)] = v as u8;
- }
- }
-}
-
-fn topleft_pixel(a: &[u8], x0: usize, y0: usize, stride: usize) -> u8 {
- a[(y0 - 1) * stride + x0 - 1]
-}
-
-fn top_pixels(a: &[u8], x0: usize, y0: usize, stride: usize) -> (u8, u8, u8, u8, u8, u8, u8, u8) {
- let pos = (y0 - 1) * stride + x0;
- let a_slice = &a[pos..pos + 8];
- let a0 = a_slice[0];
- let a1 = a_slice[1];
- let a2 = a_slice[2];
- let a3 = a_slice[3];
- let a4 = a_slice[4];
- let a5 = a_slice[5];
- let a6 = a_slice[6];
- let a7 = a_slice[7];
-
- (a0, a1, a2, a3, a4, a5, a6, a7)
-}
-
-fn left_pixels(a: &[u8], x0: usize, y0: usize, stride: usize) -> (u8, u8, u8, u8) {
- let l0 = a[y0 * stride + x0 - 1];
- let l1 = a[(y0 + 1) * stride + x0 - 1];
- let l2 = a[(y0 + 2) * stride + x0 - 1];
- let l3 = a[(y0 + 3) * stride + x0 - 1];
-
- (l0, l1, l2, l3)
-}
-
-fn edge_pixels(
- a: &[u8],
- x0: usize,
- y0: usize,
- stride: usize,
-) -> (u8, u8, u8, u8, u8, u8, u8, u8, u8) {
- let pos = (y0 - 1) * stride + x0 - 1;
- let a_slice = &a[pos..=pos + 4];
- let e0 = a[pos + 4 * stride];
- let e1 = a[pos + 3 * stride];
- let e2 = a[pos + 2 * stride];
- let e3 = a[pos + stride];
- let e4 = a_slice[0];
- let e5 = a_slice[1];
- let e6 = a_slice[2];
- let e7 = a_slice[3];
- let e8 = a_slice[4];
-
- (e0, e1, e2, e3, e4, e5, e6, e7, e8)
-}
-
-fn predict_bvepred(a: &mut [u8], x0: usize, y0: usize, stride: usize) {
- let p = topleft_pixel(a, x0, y0, stride);
- let (a0, a1, a2, a3, a4, _, _, _) = top_pixels(a, x0, y0, stride);
- let avg_1 = avg3(p, a0, a1);
- let avg_2 = avg3(a0, a1, a2);
- let avg_3 = avg3(a1, a2, a3);
- let avg_4 = avg3(a2, a3, a4);
-
- let avg = [avg_1, avg_2, avg_3, avg_4];
-
- let mut pos = y0 * stride + x0;
- for _ in 0..4 {
- a[pos..=pos + 3].copy_from_slice(&avg);
- pos += stride;
- }
-}
-
-fn predict_bhepred(a: &mut [u8], x0: usize, y0: usize, stride: usize) {
- let p = topleft_pixel(a, x0, y0, stride);
- let (l0, l1, l2, l3) = left_pixels(a, x0, y0, stride);
-
- let avgs = [
- avg3(p, l0, l1),
- avg3(l0, l1, l2),
- avg3(l1, l2, l3),
- avg3(l2, l3, l3),
- ];
-
- let mut pos = y0 * stride + x0;
- for &avg in avgs.iter() {
- for a_p in a[pos..=pos + 3].iter_mut() {
- *a_p = avg;
- }
- pos += stride;
- }
-}
-
-fn predict_bldpred(a: &mut [u8], x0: usize, y0: usize, stride: usize) {
- let (a0, a1, a2, a3, a4, a5, a6, a7) = top_pixels(a, x0, y0, stride);
-
- let avgs = [
- avg3(a0, a1, a2),
- avg3(a1, a2, a3),
- avg3(a2, a3, a4),
- avg3(a3, a4, a5),
- avg3(a4, a5, a6),
- avg3(a5, a6, a7),
- avg3(a6, a7, a7),
- ];
-
- let mut pos = y0 * stride + x0;
-
- for i in 0..4 {
- a[pos..=pos + 3].copy_from_slice(&avgs[i..=i + 3]);
- pos += stride;
- }
-}
-
-fn predict_brdpred(a: &mut [u8], x0: usize, y0: usize, stride: usize) {
- let (e0, e1, e2, e3, e4, e5, e6, e7, e8) = edge_pixels(a, x0, y0, stride);
-
- let avgs = [
- avg3(e0, e1, e2),
- avg3(e1, e2, e3),
- avg3(e2, e3, e4),
- avg3(e3, e4, e5),
- avg3(e4, e5, e6),
- avg3(e5, e6, e7),
- avg3(e6, e7, e8),
- ];
- let mut pos = y0 * stride + x0;
-
- for i in 0..4 {
- a[pos..=pos + 3].copy_from_slice(&avgs[3 - i..7 - i]);
- pos += stride;
- }
-}
-
-fn predict_bvrpred(a: &mut [u8], x0: usize, y0: usize, stride: usize) {
- let (_, e1, e2, e3, e4, e5, e6, e7, e8) = edge_pixels(a, x0, y0, stride);
-
- a[(y0 + 3) * stride + x0] = avg3(e1, e2, e3);
- a[(y0 + 2) * stride + x0] = avg3(e2, e3, e4);
- a[(y0 + 3) * stride + x0 + 1] = avg3(e3, e4, e5);
- a[(y0 + 1) * stride + x0] = avg3(e3, e4, e5);
- a[(y0 + 2) * stride + x0 + 1] = avg2(e4, e5);
- a[y0 * stride + x0] = avg2(e4, e5);
- a[(y0 + 3) * stride + x0 + 2] = avg3(e4, e5, e6);
- a[(y0 + 1) * stride + x0 + 1] = avg3(e4, e5, e6);
- a[(y0 + 2) * stride + x0 + 2] = avg2(e5, e6);
- a[y0 * stride + x0 + 1] = avg2(e5, e6);
- a[(y0 + 3) * stride + x0 + 3] = avg3(e5, e6, e7);
- a[(y0 + 1) * stride + x0 + 2] = avg3(e5, e6, e7);
- a[(y0 + 2) * stride + x0 + 3] = avg2(e6, e7);
- a[y0 * stride + x0 + 2] = avg2(e6, e7);
- a[(y0 + 1) * stride + x0 + 3] = avg3(e6, e7, e8);
- a[y0 * stride + x0 + 3] = avg2(e7, e8);
-}
-
-fn predict_bvlpred(a: &mut [u8], x0: usize, y0: usize, stride: usize) {
- let (a0, a1, a2, a3, a4, a5, a6, a7) = top_pixels(a, x0, y0, stride);
-
- a[y0 * stride + x0] = avg2(a0, a1);
- a[(y0 + 1) * stride + x0] = avg3(a0, a1, a2);
- a[(y0 + 2) * stride + x0] = avg2(a1, a2);
- a[y0 * stride + x0 + 1] = avg2(a1, a2);
- a[(y0 + 1) * stride + x0 + 1] = avg3(a1, a2, a3);
- a[(y0 + 3) * stride + x0] = avg3(a1, a2, a3);
- a[(y0 + 2) * stride + x0 + 1] = avg2(a2, a3);
- a[y0 * stride + x0 + 2] = avg2(a2, a3);
- a[(y0 + 3) * stride + x0 + 1] = avg3(a2, a3, a4);
- a[(y0 + 1) * stride + x0 + 2] = avg3(a2, a3, a4);
- a[(y0 + 2) * stride + x0 + 2] = avg2(a3, a4);
- a[y0 * stride + x0 + 3] = avg2(a3, a4);
- a[(y0 + 3) * stride + x0 + 2] = avg3(a3, a4, a5);
- a[(y0 + 1) * stride + x0 + 3] = avg3(a3, a4, a5);
- a[(y0 + 2) * stride + x0 + 3] = avg3(a4, a5, a6);
- a[(y0 + 3) * stride + x0 + 3] = avg3(a5, a6, a7);
-}
-
-fn predict_bhdpred(a: &mut [u8], x0: usize, y0: usize, stride: usize) {
- let (e0, e1, e2, e3, e4, e5, e6, e7, _) = edge_pixels(a, x0, y0, stride);
-
- a[(y0 + 3) * stride + x0] = avg2(e0, e1);
- a[(y0 + 3) * stride + x0 + 1] = avg3(e0, e1, e2);
- a[(y0 + 2) * stride + x0] = avg2(e1, e2);
- a[(y0 + 3) * stride + x0 + 2] = avg2(e1, e2);
- a[(y0 + 2) * stride + x0 + 1] = avg3(e1, e2, e3);
- a[(y0 + 3) * stride + x0 + 3] = avg3(e1, e2, e3);
- a[(y0 + 2) * stride + x0 + 2] = avg2(e2, e3);
- a[(y0 + 1) * stride + x0] = avg2(e2, e3);
- a[(y0 + 2) * stride + x0 + 3] = avg3(e2, e3, e4);
- a[(y0 + 1) * stride + x0 + 1] = avg3(e2, e3, e4);
- a[(y0 + 1) * stride + x0 + 2] = avg2(e3, e4);
- a[y0 * stride + x0] = avg2(e3, e4);
- a[(y0 + 1) * stride + x0 + 3] = avg3(e3, e4, e5);
- a[y0 * stride + x0 + 1] = avg3(e3, e4, e5);
- a[y0 * stride + x0 + 2] = avg3(e4, e5, e6);
- a[y0 * stride + x0 + 3] = avg3(e5, e6, e7);
-}
-
-fn predict_bhupred(a: &mut [u8], x0: usize, y0: usize, stride: usize) {
- let (l0, l1, l2, l3) = left_pixels(a, x0, y0, stride);
-
- a[y0 * stride + x0] = avg2(l0, l1);
- a[y0 * stride + x0 + 1] = avg3(l0, l1, l2);
- a[y0 * stride + x0 + 2] = avg2(l1, l2);
- a[(y0 + 1) * stride + x0] = avg2(l1, l2);
- a[y0 * stride + x0 + 3] = avg3(l1, l2, l3);
- a[(y0 + 1) * stride + x0 + 1] = avg3(l1, l2, l3);
- a[(y0 + 1) * stride + x0 + 2] = avg2(l2, l3);
- a[(y0 + 2) * stride + x0] = avg2(l2, l3);
- a[(y0 + 1) * stride + x0 + 3] = avg3(l2, l3, l3);
- a[(y0 + 2) * stride + x0 + 1] = avg3(l2, l3, l3);
- a[(y0 + 2) * stride + x0 + 2] = l3;
- a[(y0 + 2) * stride + x0 + 3] = l3;
- a[(y0 + 3) * stride + x0] = l3;
- a[(y0 + 3) * stride + x0 + 1] = l3;
- a[(y0 + 3) * stride + x0 + 2] = l3;
- a[(y0 + 3) * stride + x0 + 3] = l3;
-}
-
-#[cfg(test)]
-mod test {
-
- #[cfg(feature = "benchmarks")]
- extern crate test;
- use super::{
- add_residue, avg2, avg3, edge_pixels, predict_bhepred, predict_bldpred, predict_brdpred,
- predict_bvepred, top_pixels,
- };
- #[cfg(feature = "benchmarks")]
- use super::{predict_4x4, IntraMode};
- #[cfg(feature = "benchmarks")]
- use test::{black_box, Bencher};
-
- #[cfg(feature = "benchmarks")]
- const W: usize = 256;
- #[cfg(feature = "benchmarks")]
- const H: usize = 256;
-
- #[cfg(feature = "benchmarks")]
- fn make_sample_image() -> Vec<u8> {
- let mut v = Vec::with_capacity((W * H * 4) as usize);
- for c in 0u8..=255 {
- for k in 0u8..=255 {
- v.push(c);
- v.push(0);
- v.push(0);
- v.push(k);
- }
- }
- v
- }
-
- #[cfg(feature = "benchmarks")]
- #[bench]
- fn bench_predict_4x4(b: &mut Bencher) {
- let mut v = black_box(make_sample_image());
-
- let res_data = vec![1i32; W * H * 4];
- let modes = [
- IntraMode::TM,
- IntraMode::VE,
- IntraMode::HE,
- IntraMode::DC,
- IntraMode::LD,
- IntraMode::RD,
- IntraMode::VR,
- IntraMode::VL,
- IntraMode::HD,
- IntraMode::HU,
- IntraMode::TM,
- IntraMode::VE,
- IntraMode::HE,
- IntraMode::DC,
- IntraMode::LD,
- IntraMode::RD,
- ];
-
- b.iter(|| {
- black_box(predict_4x4(&mut v, W * 2, &modes, &res_data));
- });
- }
-
- #[cfg(feature = "benchmarks")]
- #[bench]
- fn bench_predict_bvepred(b: &mut Bencher) {
- let mut v = make_sample_image();
-
- b.iter(|| {
- predict_bvepred(black_box(&mut v), 5, 5, W * 2);
- });
- }
-
- #[cfg(feature = "benchmarks")]
- #[bench]
- fn bench_predict_bldpred(b: &mut Bencher) {
- let mut v = black_box(make_sample_image());
-
- b.iter(|| {
- black_box(predict_bldpred(black_box(&mut v), 5, 5, W * 2));
- });
- }
-
- #[cfg(feature = "benchmarks")]
- #[bench]
- fn bench_predict_brdpred(b: &mut Bencher) {
- let mut v = black_box(make_sample_image());
-
- b.iter(|| {
- black_box(predict_brdpred(black_box(&mut v), 5, 5, W * 2));
- });
- }
-
- #[cfg(feature = "benchmarks")]
- #[bench]
- fn bench_predict_bhepred(b: &mut Bencher) {
- let mut v = black_box(make_sample_image());
-
- b.iter(|| {
- black_box(predict_bhepred(black_box(&mut v), 5, 5, W * 2));
- });
- }
-
- #[cfg(feature = "benchmarks")]
- #[bench]
- fn bench_top_pixels(b: &mut Bencher) {
- let v = black_box(make_sample_image());
-
- b.iter(|| {
- black_box(top_pixels(black_box(&v), 5, 5, W * 2));
- });
- }
-
- #[cfg(feature = "benchmarks")]
- #[bench]
- fn bench_edge_pixels(b: &mut Bencher) {
- let v = black_box(make_sample_image());
-
- b.iter(|| {
- black_box(edge_pixels(black_box(&v), 5, 5, W * 2));
- });
- }
-
- #[test]
- fn test_avg2() {
- for i in 0u8..=255 {
- for j in 0u8..=255 {
- let ceil_avg = ((i as f32) + (j as f32)) / 2.0;
- let ceil_avg = ceil_avg.ceil() as u8;
- assert_eq!(
- ceil_avg,
- avg2(i, j),
- "avg2({}, {}), expected {}, got {}.",
- i,
- j,
- ceil_avg,
- avg2(i, j)
- );
- }
- }
- }
-
- #[test]
- fn test_avg2_specific() {
- assert_eq!(
- 255,
- avg2(255, 255),
- "avg2(255, 255), expected 255, got {}.",
- avg2(255, 255)
- );
- assert_eq!(1, avg2(1, 1), "avg2(1, 1), expected 1, got {}.", avg2(1, 1));
- assert_eq!(2, avg2(2, 1), "avg2(2, 1), expected 2, got {}.", avg2(2, 1));
- }
-
- #[test]
- fn test_avg3() {
- for i in 0u8..=255 {
- for j in 0u8..=255 {
- for k in 0u8..=255 {
- let floor_avg = ((i as f32) + 2.0 * (j as f32) + { k as f32 } + 2.0) / 4.0;
- let floor_avg = floor_avg.floor() as u8;
- assert_eq!(
- floor_avg,
- avg3(i, j, k),
- "avg3({}, {}, {}), expected {}, got {}.",
- i,
- j,
- k,
- floor_avg,
- avg3(i, j, k)
- );
- }
- }
- }
- }
-
- #[test]
- fn test_edge_pixels() {
- #[rustfmt::skip]
- let im = vec![5, 6, 7, 8, 9,
- 4, 0, 0, 0, 0,
- 3, 0, 0, 0, 0,
- 2, 0, 0, 0, 0,
- 1, 0, 0, 0, 0];
- let (e0, e1, e2, e3, e4, e5, e6, e7, e8) = edge_pixels(&im, 1, 1, 5);
- assert_eq!(e0, 1);
- assert_eq!(e1, 2);
- assert_eq!(e2, 3);
- assert_eq!(e3, 4);
- assert_eq!(e4, 5);
- assert_eq!(e5, 6);
- assert_eq!(e6, 7);
- assert_eq!(e7, 8);
- assert_eq!(e8, 9);
- }
-
- #[test]
- fn test_top_pixels() {
- #[rustfmt::skip]
- let im = vec![1, 2, 3, 4, 5, 6, 7, 8,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0];
- let (e0, e1, e2, e3, e4, e5, e6, e7) = top_pixels(&im, 0, 1, 8);
- assert_eq!(e0, 1);
- assert_eq!(e1, 2);
- assert_eq!(e2, 3);
- assert_eq!(e3, 4);
- assert_eq!(e4, 5);
- assert_eq!(e5, 6);
- assert_eq!(e6, 7);
- assert_eq!(e7, 8);
- }
-
- #[test]
- fn test_add_residue() {
- let mut pblock = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16];
- let rblock = [
- -1, -2, -3, -4, 250, 249, 248, 250, -10, -18, -192, -17, -3, 15, 18, 9,
- ];
- let expected: [u8; 16] = [0, 0, 0, 0, 255, 255, 255, 255, 0, 0, 0, 0, 10, 29, 33, 25];
-
- add_residue(&mut pblock, &rblock, 0, 0, 4);
-
- for (&e, &i) in expected.iter().zip(&pblock) {
- assert_eq!(e, i);
- }
- }
-
- #[test]
- fn test_predict_bhepred() {
- #[rustfmt::skip]
- let expected: Vec<u8> = vec![5, 0, 0, 0, 0,
- 4, 4, 4, 4, 4,
- 3, 3, 3, 3, 3,
- 2, 2, 2, 2, 2,
- 1, 1, 1, 1, 1];
-
- #[rustfmt::skip]
- let mut im = vec![5, 0, 0, 0, 0,
- 4, 0, 0, 0, 0,
- 3, 0, 0, 0, 0,
- 2, 0, 0, 0, 0,
- 1, 0, 0, 0, 0];
- predict_bhepred(&mut im, 1, 1, 5);
- for (&e, i) in expected.iter().zip(im) {
- assert_eq!(e, i);
- }
- }
-
- #[test]
- fn test_predict_brdpred() {
- #[rustfmt::skip]
- let expected: Vec<u8> = vec![5, 6, 7, 8, 9,
- 4, 5, 6, 7, 8,
- 3, 4, 5, 6, 7,
- 2, 3, 4, 5, 6,
- 1, 2, 3, 4, 5];
-
- #[rustfmt::skip]
- let mut im = vec![5, 6, 7, 8, 9,
- 4, 0, 0, 0, 0,
- 3, 0, 0, 0, 0,
- 2, 0, 0, 0, 0,
- 1, 0, 0, 0, 0];
- predict_brdpred(&mut im, 1, 1, 5);
- for (&e, i) in expected.iter().zip(im) {
- assert_eq!(e, i);
- }
- }
-
- #[test]
- fn test_predict_bldpred() {
- #[rustfmt::skip]
- let mut im: Vec<u8> = vec![1, 2, 3, 4, 5, 6, 7, 8,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0];
- let avg_1 = 2u8;
- let avg_2 = 3u8;
- let avg_3 = 4u8;
- let avg_4 = 5u8;
- let avg_5 = 6u8;
- let avg_6 = 7u8;
- let avg_7 = 8u8;
-
- predict_bldpred(&mut im, 0, 1, 8);
-
- assert_eq!(im[8], avg_1);
- assert_eq!(im[9], avg_2);
- assert_eq!(im[10], avg_3);
- assert_eq!(im[11], avg_4);
- assert_eq!(im[16], avg_2);
- assert_eq!(im[17], avg_3);
- assert_eq!(im[18], avg_4);
- assert_eq!(im[19], avg_5);
- assert_eq!(im[24], avg_3);
- assert_eq!(im[25], avg_4);
- assert_eq!(im[26], avg_5);
- assert_eq!(im[27], avg_6);
- assert_eq!(im[32], avg_4);
- assert_eq!(im[33], avg_5);
- assert_eq!(im[34], avg_6);
- assert_eq!(im[35], avg_7);
- }
-
- #[test]
- fn test_predict_bvepred() {
- #[rustfmt::skip]
- let mut im: Vec<u8> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9,
- 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0];
- let avg_1 = 2u8;
- let avg_2 = 3u8;
- let avg_3 = 4u8;
- let avg_4 = 5u8;
-
- predict_bvepred(&mut im, 1, 1, 9);
-
- assert_eq!(im[10], avg_1);
- assert_eq!(im[11], avg_2);
- assert_eq!(im[12], avg_3);
- assert_eq!(im[13], avg_4);
- assert_eq!(im[19], avg_1);
- assert_eq!(im[20], avg_2);
- assert_eq!(im[21], avg_3);
- assert_eq!(im[22], avg_4);
- assert_eq!(im[28], avg_1);
- assert_eq!(im[29], avg_2);
- assert_eq!(im[30], avg_3);
- assert_eq!(im[31], avg_4);
- assert_eq!(im[37], avg_1);
- assert_eq!(im[38], avg_2);
- assert_eq!(im[39], avg_3);
- assert_eq!(im[40], avg_4);
- }
-}
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