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diff --git a/vendor/image/src/image.rs b/vendor/image/src/image.rs
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+#![allow(clippy::too_many_arguments)]
+use std::convert::TryFrom;
+use std::ffi::OsStr;
+use std::io;
+use std::io::Read;
+use std::ops::{Deref, DerefMut};
+use std::path::Path;
+use std::usize;
+
+use crate::color::{ColorType, ExtendedColorType};
+use crate::error::{
+ ImageError, ImageFormatHint, ImageResult, LimitError, LimitErrorKind, ParameterError,
+ ParameterErrorKind,
+};
+use crate::math::Rect;
+use crate::traits::Pixel;
+use crate::ImageBuffer;
+
+use crate::animation::Frames;
+
+#[cfg(feature = "pnm")]
+use crate::codecs::pnm::PnmSubtype;
+
+/// An enumeration of supported image formats.
+/// Not all formats support both encoding and decoding.
+#[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
+#[non_exhaustive]
+pub enum ImageFormat {
+ /// An Image in PNG Format
+ Png,
+
+ /// An Image in JPEG Format
+ Jpeg,
+
+ /// An Image in GIF Format
+ Gif,
+
+ /// An Image in WEBP Format
+ WebP,
+
+ /// An Image in general PNM Format
+ Pnm,
+
+ /// An Image in TIFF Format
+ Tiff,
+
+ /// An Image in TGA Format
+ Tga,
+
+ /// An Image in DDS Format
+ Dds,
+
+ /// An Image in BMP Format
+ Bmp,
+
+ /// An Image in ICO Format
+ Ico,
+
+ /// An Image in Radiance HDR Format
+ Hdr,
+
+ /// An Image in OpenEXR Format
+ OpenExr,
+
+ /// An Image in farbfeld Format
+ Farbfeld,
+
+ /// An Image in AVIF format.
+ Avif,
+
+ /// An Image in QOI format.
+ Qoi,
+}
+
+impl ImageFormat {
+ /// Return the image format specified by a path's file extension.
+ ///
+ /// # Example
+ ///
+ /// ```
+ /// use image::ImageFormat;
+ ///
+ /// let format = ImageFormat::from_extension("jpg");
+ /// assert_eq!(format, Some(ImageFormat::Jpeg));
+ /// ```
+ #[inline]
+ pub fn from_extension<S>(ext: S) -> Option<Self>
+ where
+ S: AsRef<OsStr>,
+ {
+ // thin wrapper function to strip generics
+ fn inner(ext: &OsStr) -> Option<ImageFormat> {
+ let ext = ext.to_str()?.to_ascii_lowercase();
+
+ Some(match ext.as_str() {
+ "avif" => ImageFormat::Avif,
+ "jpg" | "jpeg" => ImageFormat::Jpeg,
+ "png" => ImageFormat::Png,
+ "gif" => ImageFormat::Gif,
+ "webp" => ImageFormat::WebP,
+ "tif" | "tiff" => ImageFormat::Tiff,
+ "tga" => ImageFormat::Tga,
+ "dds" => ImageFormat::Dds,
+ "bmp" => ImageFormat::Bmp,
+ "ico" => ImageFormat::Ico,
+ "hdr" => ImageFormat::Hdr,
+ "exr" => ImageFormat::OpenExr,
+ "pbm" | "pam" | "ppm" | "pgm" => ImageFormat::Pnm,
+ "ff" | "farbfeld" => ImageFormat::Farbfeld,
+ "qoi" => ImageFormat::Qoi,
+ _ => return None,
+ })
+ }
+
+ inner(ext.as_ref())
+ }
+
+ /// Return the image format specified by the path's file extension.
+ ///
+ /// # Example
+ ///
+ /// ```
+ /// use image::ImageFormat;
+ ///
+ /// let format = ImageFormat::from_path("images/ferris.png")?;
+ /// assert_eq!(format, ImageFormat::Png);
+ ///
+ /// # Ok::<(), image::error::ImageError>(())
+ /// ```
+ #[inline]
+ pub fn from_path<P>(path: P) -> ImageResult<Self>
+ where
+ P: AsRef<Path>,
+ {
+ // thin wrapper function to strip generics
+ fn inner(path: &Path) -> ImageResult<ImageFormat> {
+ let exact_ext = path.extension();
+ exact_ext
+ .and_then(ImageFormat::from_extension)
+ .ok_or_else(|| {
+ let format_hint = match exact_ext {
+ None => ImageFormatHint::Unknown,
+ Some(os) => ImageFormatHint::PathExtension(os.into()),
+ };
+ ImageError::Unsupported(format_hint.into())
+ })
+ }
+
+ inner(path.as_ref())
+ }
+
+ /// Return the image format specified by a MIME type.
+ ///
+ /// # Example
+ ///
+ /// ```
+ /// use image::ImageFormat;
+ ///
+ /// let format = ImageFormat::from_mime_type("image/png").unwrap();
+ /// assert_eq!(format, ImageFormat::Png);
+ /// ```
+ pub fn from_mime_type<M>(mime_type: M) -> Option<Self>
+ where
+ M: AsRef<str>,
+ {
+ match mime_type.as_ref() {
+ "image/avif" => Some(ImageFormat::Avif),
+ "image/jpeg" => Some(ImageFormat::Jpeg),
+ "image/png" => Some(ImageFormat::Png),
+ "image/gif" => Some(ImageFormat::Gif),
+ "image/webp" => Some(ImageFormat::WebP),
+ "image/tiff" => Some(ImageFormat::Tiff),
+ "image/x-targa" | "image/x-tga" => Some(ImageFormat::Tga),
+ "image/vnd-ms.dds" => Some(ImageFormat::Dds),
+ "image/bmp" => Some(ImageFormat::Bmp),
+ "image/x-icon" => Some(ImageFormat::Ico),
+ "image/vnd.radiance" => Some(ImageFormat::Hdr),
+ "image/x-exr" => Some(ImageFormat::OpenExr),
+ "image/x-portable-bitmap"
+ | "image/x-portable-graymap"
+ | "image/x-portable-pixmap"
+ | "image/x-portable-anymap" => Some(ImageFormat::Pnm),
+ // Qoi's MIME type is being worked on.
+ // See: https://github.com/phoboslab/qoi/issues/167
+ "image/x-qoi" => Some(ImageFormat::Qoi),
+ _ => None,
+ }
+ }
+
+ /// Return the MIME type for this image format or "application/octet-stream" if no MIME type
+ /// exists for the format.
+ ///
+ /// Some notes on a few of the MIME types:
+ ///
+ /// - The portable anymap format has a separate MIME type for the pixmap, graymap and bitmap
+ /// formats, but this method returns the general "image/x-portable-anymap" MIME type.
+ /// - The Targa format has two common MIME types, "image/x-targa" and "image/x-tga"; this
+ /// method returns "image/x-targa" for that format.
+ /// - The QOI MIME type is still a work in progress. This method returns "image/x-qoi" for
+ /// that format.
+ ///
+ /// # Example
+ ///
+ /// ```
+ /// use image::ImageFormat;
+ ///
+ /// let mime_type = ImageFormat::Png.to_mime_type();
+ /// assert_eq!(mime_type, "image/png");
+ /// ```
+ pub fn to_mime_type(&self) -> &'static str {
+ match self {
+ ImageFormat::Avif => "image/avif",
+ ImageFormat::Jpeg => "image/jpeg",
+ ImageFormat::Png => "image/png",
+ ImageFormat::Gif => "image/gif",
+ ImageFormat::WebP => "image/webp",
+ ImageFormat::Tiff => "image/tiff",
+ // the targa MIME type has two options, but this one seems to be used more
+ ImageFormat::Tga => "image/x-targa",
+ ImageFormat::Dds => "image/vnd-ms.dds",
+ ImageFormat::Bmp => "image/bmp",
+ ImageFormat::Ico => "image/x-icon",
+ ImageFormat::Hdr => "image/vnd.radiance",
+ ImageFormat::OpenExr => "image/x-exr",
+ // return the most general MIME type
+ ImageFormat::Pnm => "image/x-portable-anymap",
+ // Qoi's MIME type is being worked on.
+ // See: https://github.com/phoboslab/qoi/issues/167
+ ImageFormat::Qoi => "image/x-qoi",
+ // farbfield's MIME type taken from https://www.wikidata.org/wiki/Q28206109
+ ImageFormat::Farbfeld => "application/octet-stream",
+ }
+ }
+
+ /// Return if the ImageFormat can be decoded by the lib.
+ #[inline]
+ pub fn can_read(&self) -> bool {
+ // Needs to be updated once a new variant's decoder is added to free_functions.rs::load
+ match self {
+ ImageFormat::Png => true,
+ ImageFormat::Gif => true,
+ ImageFormat::Jpeg => true,
+ ImageFormat::WebP => true,
+ ImageFormat::Tiff => true,
+ ImageFormat::Tga => true,
+ ImageFormat::Dds => false,
+ ImageFormat::Bmp => true,
+ ImageFormat::Ico => true,
+ ImageFormat::Hdr => true,
+ ImageFormat::OpenExr => true,
+ ImageFormat::Pnm => true,
+ ImageFormat::Farbfeld => true,
+ ImageFormat::Avif => true,
+ ImageFormat::Qoi => true,
+ }
+ }
+
+ /// Return if the ImageFormat can be encoded by the lib.
+ #[inline]
+ pub fn can_write(&self) -> bool {
+ // Needs to be updated once a new variant's encoder is added to free_functions.rs::save_buffer_with_format_impl
+ match self {
+ ImageFormat::Gif => true,
+ ImageFormat::Ico => true,
+ ImageFormat::Jpeg => true,
+ ImageFormat::Png => true,
+ ImageFormat::Bmp => true,
+ ImageFormat::Tiff => true,
+ ImageFormat::Tga => true,
+ ImageFormat::Pnm => true,
+ ImageFormat::Farbfeld => true,
+ ImageFormat::Avif => true,
+ ImageFormat::WebP => true,
+ ImageFormat::Hdr => false,
+ ImageFormat::OpenExr => true,
+ ImageFormat::Dds => false,
+ ImageFormat::Qoi => true,
+ }
+ }
+
+ /// Return a list of applicable extensions for this format.
+ ///
+ /// All currently recognized image formats specify at least on extension but for future
+ /// compatibility you should not rely on this fact. The list may be empty if the format has no
+ /// recognized file representation, for example in case it is used as a purely transient memory
+ /// format.
+ ///
+ /// The method name `extensions` remains reserved for introducing another method in the future
+ /// that yields a slice of `OsStr` which is blocked by several features of const evaluation.
+ pub fn extensions_str(self) -> &'static [&'static str] {
+ match self {
+ ImageFormat::Png => &["png"],
+ ImageFormat::Jpeg => &["jpg", "jpeg"],
+ ImageFormat::Gif => &["gif"],
+ ImageFormat::WebP => &["webp"],
+ ImageFormat::Pnm => &["pbm", "pam", "ppm", "pgm"],
+ ImageFormat::Tiff => &["tiff", "tif"],
+ ImageFormat::Tga => &["tga"],
+ ImageFormat::Dds => &["dds"],
+ ImageFormat::Bmp => &["bmp"],
+ ImageFormat::Ico => &["ico"],
+ ImageFormat::Hdr => &["hdr"],
+ ImageFormat::OpenExr => &["exr"],
+ ImageFormat::Farbfeld => &["ff"],
+ // According to: https://aomediacodec.github.io/av1-avif/#mime-registration
+ ImageFormat::Avif => &["avif"],
+ ImageFormat::Qoi => &["qoi"],
+ }
+ }
+}
+
+/// An enumeration of supported image formats for encoding.
+#[derive(Clone, PartialEq, Eq, Debug)]
+#[non_exhaustive]
+pub enum ImageOutputFormat {
+ #[cfg(feature = "png")]
+ /// An Image in PNG Format
+ Png,
+
+ #[cfg(feature = "jpeg")]
+ /// An Image in JPEG Format with specified quality, up to 100
+ Jpeg(u8),
+
+ #[cfg(feature = "pnm")]
+ /// An Image in one of the PNM Formats
+ Pnm(PnmSubtype),
+
+ #[cfg(feature = "gif")]
+ /// An Image in GIF Format
+ Gif,
+
+ #[cfg(feature = "ico")]
+ /// An Image in ICO Format
+ Ico,
+
+ #[cfg(feature = "bmp")]
+ /// An Image in BMP Format
+ Bmp,
+
+ #[cfg(feature = "farbfeld")]
+ /// An Image in farbfeld Format
+ Farbfeld,
+
+ #[cfg(feature = "tga")]
+ /// An Image in TGA Format
+ Tga,
+
+ #[cfg(feature = "exr")]
+ /// An Image in OpenEXR Format
+ OpenExr,
+
+ #[cfg(feature = "tiff")]
+ /// An Image in TIFF Format
+ Tiff,
+
+ #[cfg(feature = "avif-encoder")]
+ /// An image in AVIF Format
+ Avif,
+
+ #[cfg(feature = "qoi")]
+ /// An image in QOI Format
+ Qoi,
+
+ #[cfg(feature = "webp-encoder")]
+ /// An image in WebP Format.
+ WebP,
+
+ /// A value for signalling an error: An unsupported format was requested
+ // Note: When TryFrom is stabilized, this value should not be needed, and
+ // a TryInto<ImageOutputFormat> should be used instead of an Into<ImageOutputFormat>.
+ Unsupported(String),
+}
+
+impl From<ImageFormat> for ImageOutputFormat {
+ fn from(fmt: ImageFormat) -> Self {
+ match fmt {
+ #[cfg(feature = "png")]
+ ImageFormat::Png => ImageOutputFormat::Png,
+ #[cfg(feature = "jpeg")]
+ ImageFormat::Jpeg => ImageOutputFormat::Jpeg(75),
+ #[cfg(feature = "pnm")]
+ ImageFormat::Pnm => ImageOutputFormat::Pnm(PnmSubtype::ArbitraryMap),
+ #[cfg(feature = "gif")]
+ ImageFormat::Gif => ImageOutputFormat::Gif,
+ #[cfg(feature = "ico")]
+ ImageFormat::Ico => ImageOutputFormat::Ico,
+ #[cfg(feature = "bmp")]
+ ImageFormat::Bmp => ImageOutputFormat::Bmp,
+ #[cfg(feature = "farbfeld")]
+ ImageFormat::Farbfeld => ImageOutputFormat::Farbfeld,
+ #[cfg(feature = "tga")]
+ ImageFormat::Tga => ImageOutputFormat::Tga,
+ #[cfg(feature = "exr")]
+ ImageFormat::OpenExr => ImageOutputFormat::OpenExr,
+ #[cfg(feature = "tiff")]
+ ImageFormat::Tiff => ImageOutputFormat::Tiff,
+
+ #[cfg(feature = "avif-encoder")]
+ ImageFormat::Avif => ImageOutputFormat::Avif,
+ #[cfg(feature = "webp-encoder")]
+ ImageFormat::WebP => ImageOutputFormat::WebP,
+
+ #[cfg(feature = "qoi")]
+ ImageFormat::Qoi => ImageOutputFormat::Qoi,
+
+ f => ImageOutputFormat::Unsupported(format!("{:?}", f)),
+ }
+ }
+}
+
+// This struct manages buffering associated with implementing `Read` and `Seek` on decoders that can
+// must decode ranges of bytes at a time.
+#[allow(dead_code)]
+// When no image formats that use it are enabled
+pub(crate) struct ImageReadBuffer {
+ scanline_bytes: usize,
+ buffer: Vec<u8>,
+ consumed: usize,
+
+ total_bytes: u64,
+ offset: u64,
+}
+impl ImageReadBuffer {
+ /// Create a new ImageReadBuffer.
+ ///
+ /// Panics if scanline_bytes doesn't fit into a usize, because that would mean reading anything
+ /// from the image would take more RAM than the entire virtual address space. In other words,
+ /// actually using this struct would instantly OOM so just get it out of the way now.
+ #[allow(dead_code)]
+ // When no image formats that use it are enabled
+ pub(crate) fn new(scanline_bytes: u64, total_bytes: u64) -> Self {
+ Self {
+ scanline_bytes: usize::try_from(scanline_bytes).unwrap(),
+ buffer: Vec::new(),
+ consumed: 0,
+ total_bytes,
+ offset: 0,
+ }
+ }
+
+ #[allow(dead_code)]
+ // When no image formats that use it are enabled
+ pub(crate) fn read<F>(&mut self, buf: &mut [u8], mut read_scanline: F) -> io::Result<usize>
+ where
+ F: FnMut(&mut [u8]) -> io::Result<usize>,
+ {
+ if self.buffer.len() == self.consumed {
+ if self.offset == self.total_bytes {
+ return Ok(0);
+ } else if buf.len() >= self.scanline_bytes {
+ // If there is nothing buffered and the user requested a full scanline worth of
+ // data, skip buffering.
+ let bytes_read = read_scanline(&mut buf[..self.scanline_bytes])?;
+ self.offset += u64::try_from(bytes_read).unwrap();
+ return Ok(bytes_read);
+ } else {
+ // Lazily allocate buffer the first time that read is called with a buffer smaller
+ // than the scanline size.
+ if self.buffer.is_empty() {
+ self.buffer.resize(self.scanline_bytes, 0);
+ }
+
+ self.consumed = 0;
+ let bytes_read = read_scanline(&mut self.buffer[..])?;
+ self.buffer.resize(bytes_read, 0);
+ self.offset += u64::try_from(bytes_read).unwrap();
+
+ assert!(bytes_read == self.scanline_bytes || self.offset == self.total_bytes);
+ }
+ }
+
+ // Finally, copy bytes into output buffer.
+ let bytes_buffered = self.buffer.len() - self.consumed;
+ if bytes_buffered > buf.len() {
+ buf.copy_from_slice(&self.buffer[self.consumed..][..buf.len()]);
+ self.consumed += buf.len();
+ Ok(buf.len())
+ } else {
+ buf[..bytes_buffered].copy_from_slice(&self.buffer[self.consumed..][..bytes_buffered]);
+ self.consumed = self.buffer.len();
+ Ok(bytes_buffered)
+ }
+ }
+}
+
+/// Decodes a specific region of the image, represented by the rectangle
+/// starting from ```x``` and ```y``` and having ```length``` and ```width```
+#[allow(dead_code)]
+// When no image formats that use it are enabled
+pub(crate) fn load_rect<'a, D, F, F1, F2, E>(
+ x: u32,
+ y: u32,
+ width: u32,
+ height: u32,
+ buf: &mut [u8],
+ progress_callback: F,
+ decoder: &mut D,
+ mut seek_scanline: F1,
+ mut read_scanline: F2,
+) -> ImageResult<()>
+where
+ D: ImageDecoder<'a>,
+ F: Fn(Progress),
+ F1: FnMut(&mut D, u64) -> io::Result<()>,
+ F2: FnMut(&mut D, &mut [u8]) -> Result<(), E>,
+ ImageError: From<E>,
+{
+ let (x, y, width, height) = (
+ u64::from(x),
+ u64::from(y),
+ u64::from(width),
+ u64::from(height),
+ );
+ let dimensions = decoder.dimensions();
+ let bytes_per_pixel = u64::from(decoder.color_type().bytes_per_pixel());
+ let row_bytes = bytes_per_pixel * u64::from(dimensions.0);
+ let scanline_bytes = decoder.scanline_bytes();
+ let total_bytes = width * height * bytes_per_pixel;
+
+ if buf.len() < usize::try_from(total_bytes).unwrap_or(usize::max_value()) {
+ panic!(
+ "output buffer too short\n expected `{}`, provided `{}`",
+ total_bytes,
+ buf.len()
+ );
+ }
+
+ let mut bytes_read = 0u64;
+ let mut current_scanline = 0;
+ let mut tmp = Vec::new();
+ let mut tmp_scanline = None;
+
+ {
+ // Read a range of the image starting from byte number `start` and continuing until byte
+ // number `end`. Updates `current_scanline` and `bytes_read` appropriately.
+ let mut read_image_range = |mut start: u64, end: u64| -> ImageResult<()> {
+ // If the first scanline we need is already stored in the temporary buffer, then handle
+ // it first.
+ let target_scanline = start / scanline_bytes;
+ if tmp_scanline == Some(target_scanline) {
+ let position = target_scanline * scanline_bytes;
+ let offset = start.saturating_sub(position);
+ let len = (end - start)
+ .min(scanline_bytes - offset)
+ .min(end - position);
+
+ buf[(bytes_read as usize)..][..len as usize]
+ .copy_from_slice(&tmp[offset as usize..][..len as usize]);
+ bytes_read += len;
+ start += len;
+
+ progress_callback(Progress {
+ current: bytes_read,
+ total: total_bytes,
+ });
+
+ if start == end {
+ return Ok(());
+ }
+ }
+
+ let target_scanline = start / scanline_bytes;
+ if target_scanline != current_scanline {
+ seek_scanline(decoder, target_scanline)?;
+ current_scanline = target_scanline;
+ }
+
+ let mut position = current_scanline * scanline_bytes;
+ while position < end {
+ if position >= start && end - position >= scanline_bytes {
+ read_scanline(
+ decoder,
+ &mut buf[(bytes_read as usize)..][..(scanline_bytes as usize)],
+ )?;
+ bytes_read += scanline_bytes;
+ } else {
+ tmp.resize(scanline_bytes as usize, 0u8);
+ read_scanline(decoder, &mut tmp)?;
+ tmp_scanline = Some(current_scanline);
+
+ let offset = start.saturating_sub(position);
+ let len = (end - start)
+ .min(scanline_bytes - offset)
+ .min(end - position);
+
+ buf[(bytes_read as usize)..][..len as usize]
+ .copy_from_slice(&tmp[offset as usize..][..len as usize]);
+ bytes_read += len;
+ }
+
+ current_scanline += 1;
+ position += scanline_bytes;
+ progress_callback(Progress {
+ current: bytes_read,
+ total: total_bytes,
+ });
+ }
+ Ok(())
+ };
+
+ if x + width > u64::from(dimensions.0)
+ || y + height > u64::from(dimensions.1)
+ || width == 0
+ || height == 0
+ {
+ return Err(ImageError::Parameter(ParameterError::from_kind(
+ ParameterErrorKind::DimensionMismatch,
+ )));
+ }
+ if scanline_bytes > usize::max_value() as u64 {
+ return Err(ImageError::Limits(LimitError::from_kind(
+ LimitErrorKind::InsufficientMemory,
+ )));
+ }
+
+ progress_callback(Progress {
+ current: 0,
+ total: total_bytes,
+ });
+ if x == 0 && width == u64::from(dimensions.0) {
+ let start = x * bytes_per_pixel + y * row_bytes;
+ let end = (x + width) * bytes_per_pixel + (y + height - 1) * row_bytes;
+ read_image_range(start, end)?;
+ } else {
+ for row in y..(y + height) {
+ let start = x * bytes_per_pixel + row * row_bytes;
+ let end = (x + width) * bytes_per_pixel + row * row_bytes;
+ read_image_range(start, end)?;
+ }
+ }
+ }
+
+ // Seek back to the start
+ Ok(seek_scanline(decoder, 0)?)
+}
+
+/// Reads all of the bytes of a decoder into a Vec<T>. No particular alignment
+/// of the output buffer is guaranteed.
+///
+/// Panics if there isn't enough memory to decode the image.
+pub(crate) fn decoder_to_vec<'a, T>(decoder: impl ImageDecoder<'a>) -> ImageResult<Vec<T>>
+where
+ T: crate::traits::Primitive + bytemuck::Pod,
+{
+ let total_bytes = usize::try_from(decoder.total_bytes());
+ if total_bytes.is_err() || total_bytes.unwrap() > isize::max_value() as usize {
+ return Err(ImageError::Limits(LimitError::from_kind(
+ LimitErrorKind::InsufficientMemory,
+ )));
+ }
+
+ let mut buf = vec![num_traits::Zero::zero(); total_bytes.unwrap() / std::mem::size_of::<T>()];
+ decoder.read_image(bytemuck::cast_slice_mut(buf.as_mut_slice()))?;
+ Ok(buf)
+}
+
+/// Represents the progress of an image operation.
+///
+/// Note that this is not necessarily accurate and no change to the values passed to the progress
+/// function during decoding will be considered breaking. A decoder could in theory report the
+/// progress `(0, 0)` if progress is unknown, without violating the interface contract of the type.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct Progress {
+ current: u64,
+ total: u64,
+}
+
+impl Progress {
+ /// Create Progress. Result in invalid progress if you provide a greater `current` than `total`.
+ pub(crate) fn new(current: u64, total: u64) -> Self {
+ Self { current, total }
+ }
+
+ /// A measure of completed decoding.
+ pub fn current(self) -> u64 {
+ self.current
+ }
+
+ /// A measure of all necessary decoding work.
+ ///
+ /// This is in general greater or equal than `current`.
+ pub fn total(self) -> u64 {
+ self.total
+ }
+
+ /// Calculate a measure for remaining decoding work.
+ pub fn remaining(self) -> u64 {
+ self.total.max(self.current) - self.current
+ }
+}
+
+/// The trait that all decoders implement
+pub trait ImageDecoder<'a>: Sized {
+ /// The type of reader produced by `into_reader`.
+ type Reader: Read + 'a;
+
+ /// Returns a tuple containing the width and height of the image
+ fn dimensions(&self) -> (u32, u32);
+
+ /// Returns the color type of the image data produced by this decoder
+ fn color_type(&self) -> ColorType;
+
+ /// Returns the color type of the image file before decoding
+ fn original_color_type(&self) -> ExtendedColorType {
+ self.color_type().into()
+ }
+
+ /// Returns the ICC color profile embedded in the image
+ ///
+ /// For formats that don't support embedded profiles this function will always return `None`.
+ /// This feature is currently only supported for the JPEG, PNG, and AVIF formats.
+ fn icc_profile(&mut self) -> Option<Vec<u8>> {
+ None
+ }
+
+ /// Returns a reader that can be used to obtain the bytes of the image. For the best
+ /// performance, always try to read at least `scanline_bytes` from the reader at a time. Reading
+ /// fewer bytes will cause the reader to perform internal buffering.
+ fn into_reader(self) -> ImageResult<Self::Reader>;
+
+ /// Returns the total number of bytes in the decoded image.
+ ///
+ /// This is the size of the buffer that must be passed to `read_image` or
+ /// `read_image_with_progress`. The returned value may exceed usize::MAX, in
+ /// which case it isn't actually possible to construct a buffer to decode all the image data
+ /// into. If, however, the size does not fit in a u64 then u64::MAX is returned.
+ fn total_bytes(&self) -> u64 {
+ let dimensions = self.dimensions();
+ let total_pixels = u64::from(dimensions.0) * u64::from(dimensions.1);
+ let bytes_per_pixel = u64::from(self.color_type().bytes_per_pixel());
+ total_pixels.saturating_mul(bytes_per_pixel)
+ }
+
+ /// Returns the minimum number of bytes that can be efficiently read from this decoder. This may
+ /// be as few as 1 or as many as `total_bytes()`.
+ fn scanline_bytes(&self) -> u64 {
+ self.total_bytes()
+ }
+
+ /// Returns all the bytes in the image.
+ ///
+ /// This function takes a slice of bytes and writes the pixel data of the image into it.
+ /// Although not required, for certain color types callers may want to pass buffers which are
+ /// aligned to 2 or 4 byte boundaries to the slice can be cast to a [u16] or [u32]. To accommodate
+ /// such casts, the returned contents will always be in native endian.
+ ///
+ /// # Panics
+ ///
+ /// This function panics if buf.len() != self.total_bytes().
+ ///
+ /// # Examples
+ ///
+ /// ```no_build
+ /// use zerocopy::{AsBytes, FromBytes};
+ /// fn read_16bit_image(decoder: impl ImageDecoder) -> Vec<16> {
+ /// let mut buf: Vec<u16> = vec![0; decoder.total_bytes()/2];
+ /// decoder.read_image(buf.as_bytes());
+ /// buf
+ /// }
+ /// ```
+ fn read_image(self, buf: &mut [u8]) -> ImageResult<()> {
+ self.read_image_with_progress(buf, |_| {})
+ }
+
+ /// Same as `read_image` but periodically calls the provided callback to give updates on loading
+ /// progress.
+ fn read_image_with_progress<F: Fn(Progress)>(
+ self,
+ buf: &mut [u8],
+ progress_callback: F,
+ ) -> ImageResult<()> {
+ assert_eq!(u64::try_from(buf.len()), Ok(self.total_bytes()));
+
+ let total_bytes = self.total_bytes() as usize;
+ let scanline_bytes = self.scanline_bytes() as usize;
+ let target_read_size = if scanline_bytes < 4096 {
+ (4096 / scanline_bytes) * scanline_bytes
+ } else {
+ scanline_bytes
+ };
+
+ let mut reader = self.into_reader()?;
+
+ let mut bytes_read = 0;
+ while bytes_read < total_bytes {
+ let read_size = target_read_size.min(total_bytes - bytes_read);
+ reader.read_exact(&mut buf[bytes_read..][..read_size])?;
+ bytes_read += read_size;
+
+ progress_callback(Progress {
+ current: bytes_read as u64,
+ total: total_bytes as u64,
+ });
+ }
+
+ Ok(())
+ }
+
+ /// Set decoding limits for this decoder. See [`Limits`] for the different kinds of
+ /// limits that is possible to set.
+ ///
+ /// Note to implementors: make sure you call [`Limits::check_support`] so that
+ /// decoding fails if any unsupported strict limits are set. Also make sure
+ /// you call [`Limits::check_dimensions`] to check the `max_image_width` and
+ /// `max_image_height` limits.
+ ///
+ /// [`Limits`]: ./io/struct.Limits.html
+ /// [`Limits::check_support`]: ./io/struct.Limits.html#method.check_support
+ /// [`Limits::check_dimensions`]: ./io/struct.Limits.html#method.check_dimensions
+ fn set_limits(&mut self, limits: crate::io::Limits) -> ImageResult<()> {
+ limits.check_support(&crate::io::LimitSupport::default())?;
+
+ let (width, height) = self.dimensions();
+ limits.check_dimensions(width, height)?;
+
+ Ok(())
+ }
+}
+
+/// Specialized image decoding not be supported by all formats
+pub trait ImageDecoderRect<'a>: ImageDecoder<'a> + Sized {
+ /// Decode a rectangular section of the image; see [`read_rect_with_progress()`](#fn.read_rect_with_progress).
+ fn read_rect(
+ &mut self,
+ x: u32,
+ y: u32,
+ width: u32,
+ height: u32,
+ buf: &mut [u8],
+ ) -> ImageResult<()> {
+ self.read_rect_with_progress(x, y, width, height, buf, |_| {})
+ }
+
+ /// Decode a rectangular section of the image, periodically reporting progress.
+ ///
+ /// The output buffer will be filled with fields specified by
+ /// [`ImageDecoder::color_type()`](trait.ImageDecoder.html#fn.color_type),
+ /// in that order, each field represented in native-endian.
+ ///
+ /// The progress callback will be called at least once at the start and the end of decoding,
+ /// implementations are encouraged to call this more often,
+ /// with a frequency meaningful for display to the end-user.
+ ///
+ /// This function will panic if the output buffer isn't at least
+ /// `color_type().bytes_per_pixel() * color_type().channel_count() * width * height` bytes long.
+ fn read_rect_with_progress<F: Fn(Progress)>(
+ &mut self,
+ x: u32,
+ y: u32,
+ width: u32,
+ height: u32,
+ buf: &mut [u8],
+ progress_callback: F,
+ ) -> ImageResult<()>;
+}
+
+/// AnimationDecoder trait
+pub trait AnimationDecoder<'a> {
+ /// Consume the decoder producing a series of frames.
+ fn into_frames(self) -> Frames<'a>;
+}
+
+/// The trait all encoders implement
+pub trait ImageEncoder {
+ /// Writes all the bytes in an image to the encoder.
+ ///
+ /// This function takes a slice of bytes of the pixel data of the image
+ /// and encodes them. Unlike particular format encoders inherent impl encode
+ /// methods where endianness is not specified, here image data bytes should
+ /// always be in native endian. The implementor will reorder the endianness
+ /// as necessary for the target encoding format.
+ ///
+ /// See also `ImageDecoder::read_image` which reads byte buffers into
+ /// native endian.
+ fn write_image(
+ self,
+ buf: &[u8],
+ width: u32,
+ height: u32,
+ color_type: ColorType,
+ ) -> ImageResult<()>;
+}
+
+/// Immutable pixel iterator
+#[derive(Debug)]
+pub struct Pixels<'a, I: ?Sized + 'a> {
+ image: &'a I,
+ x: u32,
+ y: u32,
+ width: u32,
+ height: u32,
+}
+
+impl<'a, I: GenericImageView> Iterator for Pixels<'a, I> {
+ type Item = (u32, u32, I::Pixel);
+
+ fn next(&mut self) -> Option<(u32, u32, I::Pixel)> {
+ if self.x >= self.width {
+ self.x = 0;
+ self.y += 1;
+ }
+
+ if self.y >= self.height {
+ None
+ } else {
+ let pixel = self.image.get_pixel(self.x, self.y);
+ let p = (self.x, self.y, pixel);
+
+ self.x += 1;
+
+ Some(p)
+ }
+ }
+}
+
+impl<I: ?Sized> Clone for Pixels<'_, I> {
+ fn clone(&self) -> Self {
+ Pixels { ..*self }
+ }
+}
+
+/// Trait to inspect an image.
+///
+/// ```
+/// use image::{GenericImageView, Rgb, RgbImage};
+///
+/// let buffer = RgbImage::new(10, 10);
+/// let image: &dyn GenericImageView<Pixel=Rgb<u8>> = &buffer;
+/// ```
+pub trait GenericImageView {
+ /// The type of pixel.
+ type Pixel: Pixel;
+
+ /// The width and height of this image.
+ fn dimensions(&self) -> (u32, u32);
+
+ /// The width of this image.
+ fn width(&self) -> u32 {
+ let (w, _) = self.dimensions();
+ w
+ }
+
+ /// The height of this image.
+ fn height(&self) -> u32 {
+ let (_, h) = self.dimensions();
+ h
+ }
+
+ /// The bounding rectangle of this image.
+ fn bounds(&self) -> (u32, u32, u32, u32);
+
+ /// Returns true if this x, y coordinate is contained inside the image.
+ fn in_bounds(&self, x: u32, y: u32) -> bool {
+ let (ix, iy, iw, ih) = self.bounds();
+ x >= ix && x < ix + iw && y >= iy && y < iy + ih
+ }
+
+ /// Returns the pixel located at (x, y). Indexed from top left.
+ ///
+ /// # Panics
+ ///
+ /// Panics if `(x, y)` is out of bounds.
+ fn get_pixel(&self, x: u32, y: u32) -> Self::Pixel;
+
+ /// Returns the pixel located at (x, y). Indexed from top left.
+ ///
+ /// This function can be implemented in a way that ignores bounds checking.
+ /// # Safety
+ ///
+ /// The coordinates must be [`in_bounds`] of the image.
+ ///
+ /// [`in_bounds`]: #method.in_bounds
+ unsafe fn unsafe_get_pixel(&self, x: u32, y: u32) -> Self::Pixel {
+ self.get_pixel(x, y)
+ }
+
+ /// Returns an Iterator over the pixels of this image.
+ /// The iterator yields the coordinates of each pixel
+ /// along with their value
+ fn pixels(&self) -> Pixels<Self>
+ where
+ Self: Sized,
+ {
+ let (width, height) = self.dimensions();
+
+ Pixels {
+ image: self,
+ x: 0,
+ y: 0,
+ width,
+ height,
+ }
+ }
+
+ /// Returns a subimage that is an immutable view into this image.
+ /// You can use [`GenericImage::sub_image`] if you need a mutable view instead.
+ /// The coordinates set the position of the top left corner of the view.
+ fn view(&self, x: u32, y: u32, width: u32, height: u32) -> SubImage<&Self>
+ where
+ Self: Sized,
+ {
+ assert!(x as u64 + width as u64 <= self.width() as u64);
+ assert!(y as u64 + height as u64 <= self.height() as u64);
+ SubImage::new(self, x, y, width, height)
+ }
+}
+
+/// A trait for manipulating images.
+pub trait GenericImage: GenericImageView {
+ /// Gets a reference to the mutable pixel at location `(x, y)`. Indexed from top left.
+ ///
+ /// # Panics
+ ///
+ /// Panics if `(x, y)` is out of bounds.
+ ///
+ /// Panics for dynamic images (this method is deprecated and will be removed).
+ ///
+ /// ## Known issues
+ ///
+ /// This requires the buffer to contain a unique set of continuous channels in the exact order
+ /// and byte representation that the pixel type requires. This is somewhat restrictive.
+ ///
+ /// TODO: Maybe use some kind of entry API? this would allow pixel type conversion on the fly
+ /// while still doing only one array lookup:
+ ///
+ /// ```ignore
+ /// let px = image.pixel_entry_at(x,y);
+ /// px.set_from_rgba(rgba)
+ /// ```
+ #[deprecated(since = "0.24.0", note = "Use `get_pixel` and `put_pixel` instead.")]
+ fn get_pixel_mut(&mut self, x: u32, y: u32) -> &mut Self::Pixel;
+
+ /// Put a pixel at location (x, y). Indexed from top left.
+ ///
+ /// # Panics
+ ///
+ /// Panics if `(x, y)` is out of bounds.
+ fn put_pixel(&mut self, x: u32, y: u32, pixel: Self::Pixel);
+
+ /// Puts a pixel at location (x, y). Indexed from top left.
+ ///
+ /// This function can be implemented in a way that ignores bounds checking.
+ /// # Safety
+ ///
+ /// The coordinates must be [`in_bounds`] of the image.
+ ///
+ /// [`in_bounds`]: traits.GenericImageView.html#method.in_bounds
+ unsafe fn unsafe_put_pixel(&mut self, x: u32, y: u32, pixel: Self::Pixel) {
+ self.put_pixel(x, y, pixel);
+ }
+
+ /// Put a pixel at location (x, y), taking into account alpha channels
+ #[deprecated(
+ since = "0.24.0",
+ note = "Use iterator `pixels_mut` to blend the pixels directly"
+ )]
+ fn blend_pixel(&mut self, x: u32, y: u32, pixel: Self::Pixel);
+
+ /// Copies all of the pixels from another image into this image.
+ ///
+ /// The other image is copied with the top-left corner of the
+ /// other image placed at (x, y).
+ ///
+ /// In order to copy only a piece of the other image, use [`GenericImageView::view`].
+ ///
+ /// You can use [`FlatSamples`] to source pixels from an arbitrary regular raster of channel
+ /// values, for example from a foreign interface or a fixed image.
+ ///
+ /// # Returns
+ /// Returns an error if the image is too large to be copied at the given position
+ ///
+ /// [`GenericImageView::view`]: trait.GenericImageView.html#method.view
+ /// [`FlatSamples`]: flat/struct.FlatSamples.html
+ fn copy_from<O>(&mut self, other: &O, x: u32, y: u32) -> ImageResult<()>
+ where
+ O: GenericImageView<Pixel = Self::Pixel>,
+ {
+ // Do bounds checking here so we can use the non-bounds-checking
+ // functions to copy pixels.
+ if self.width() < other.width() + x || self.height() < other.height() + y {
+ return Err(ImageError::Parameter(ParameterError::from_kind(
+ ParameterErrorKind::DimensionMismatch,
+ )));
+ }
+
+ for k in 0..other.height() {
+ for i in 0..other.width() {
+ let p = other.get_pixel(i, k);
+ self.put_pixel(i + x, k + y, p);
+ }
+ }
+ Ok(())
+ }
+
+ /// Copies all of the pixels from one part of this image to another part of this image.
+ ///
+ /// The destination rectangle of the copy is specified with the top-left corner placed at (x, y).
+ ///
+ /// # Returns
+ /// `true` if the copy was successful, `false` if the image could not
+ /// be copied due to size constraints.
+ fn copy_within(&mut self, source: Rect, x: u32, y: u32) -> bool {
+ let Rect {
+ x: sx,
+ y: sy,
+ width,
+ height,
+ } = source;
+ let dx = x;
+ let dy = y;
+ assert!(sx < self.width() && dx < self.width());
+ assert!(sy < self.height() && dy < self.height());
+ if self.width() - dx.max(sx) < width || self.height() - dy.max(sy) < height {
+ return false;
+ }
+ // since `.rev()` creates a new dype we would either have to go with dynamic dispatch for the ranges
+ // or have quite a lot of code bloat. A macro gives us static dispatch with less visible bloat.
+ macro_rules! copy_within_impl_ {
+ ($xiter:expr, $yiter:expr) => {
+ for y in $yiter {
+ let sy = sy + y;
+ let dy = dy + y;
+ for x in $xiter {
+ let sx = sx + x;
+ let dx = dx + x;
+ let pixel = self.get_pixel(sx, sy);
+ self.put_pixel(dx, dy, pixel);
+ }
+ }
+ };
+ }
+ // check how target and source rectangles relate to each other so we dont overwrite data before we copied it.
+ match (sx < dx, sy < dy) {
+ (true, true) => copy_within_impl_!((0..width).rev(), (0..height).rev()),
+ (true, false) => copy_within_impl_!((0..width).rev(), 0..height),
+ (false, true) => copy_within_impl_!(0..width, (0..height).rev()),
+ (false, false) => copy_within_impl_!(0..width, 0..height),
+ }
+ true
+ }
+
+ /// Returns a mutable subimage that is a view into this image.
+ /// If you want an immutable subimage instead, use [`GenericImageView::view`]
+ /// The coordinates set the position of the top left corner of the SubImage.
+ fn sub_image(&mut self, x: u32, y: u32, width: u32, height: u32) -> SubImage<&mut Self>
+ where
+ Self: Sized,
+ {
+ assert!(x as u64 + width as u64 <= self.width() as u64);
+ assert!(y as u64 + height as u64 <= self.height() as u64);
+ SubImage::new(self, x, y, width, height)
+ }
+}
+
+/// A View into another image
+///
+/// Instances of this struct can be created using:
+/// - [`GenericImage::sub_image`] to create a mutable view,
+/// - [`GenericImageView::view`] to create an immutable view,
+/// - [`SubImage::new`] to instantiate the struct directly.
+///
+/// Note that this does _not_ implement `GenericImage`, but it dereferences to one which allows you
+/// to use it as if it did. See [Design Considerations](#Design-Considerations) below for details.
+///
+/// # Design Considerations
+///
+/// For reasons relating to coherence, this is not itself a `GenericImage` or a `GenericImageView`.
+/// In short, we want to reserve the ability of adding traits implemented for _all_ generic images
+/// but in a different manner for `SubImage`. This may be required to ensure that stacking
+/// sub-images comes at no double indirect cost.
+///
+/// If, ultimately, this is not needed then a directly implementation of `GenericImage` can and
+/// will get added. This inconvenience may alternatively get resolved if Rust allows some forms of
+/// specialization, which might make this trick unnecessary and thus also allows for a direct
+/// implementation.
+#[derive(Copy, Clone)]
+pub struct SubImage<I> {
+ inner: SubImageInner<I>,
+}
+
+/// The inner type of `SubImage` that implements `GenericImage{,View}`.
+///
+/// This type is _nominally_ `pub` but it is not exported from the crate. It should be regarded as
+/// an existential type in any case.
+#[derive(Copy, Clone)]
+pub struct SubImageInner<I> {
+ image: I,
+ xoffset: u32,
+ yoffset: u32,
+ xstride: u32,
+ ystride: u32,
+}
+
+/// Alias to access Pixel behind a reference
+type DerefPixel<I> = <<I as Deref>::Target as GenericImageView>::Pixel;
+
+/// Alias to access Subpixel behind a reference
+type DerefSubpixel<I> = <DerefPixel<I> as Pixel>::Subpixel;
+
+impl<I> SubImage<I> {
+ /// Construct a new subimage
+ /// The coordinates set the position of the top left corner of the SubImage.
+ pub fn new(image: I, x: u32, y: u32, width: u32, height: u32) -> SubImage<I> {
+ SubImage {
+ inner: SubImageInner {
+ image,
+ xoffset: x,
+ yoffset: y,
+ xstride: width,
+ ystride: height,
+ },
+ }
+ }
+
+ /// Change the coordinates of this subimage.
+ pub fn change_bounds(&mut self, x: u32, y: u32, width: u32, height: u32) {
+ self.inner.xoffset = x;
+ self.inner.yoffset = y;
+ self.inner.xstride = width;
+ self.inner.ystride = height;
+ }
+
+ /// Convert this subimage to an ImageBuffer
+ pub fn to_image(&self) -> ImageBuffer<DerefPixel<I>, Vec<DerefSubpixel<I>>>
+ where
+ I: Deref,
+ I::Target: GenericImageView + 'static,
+ {
+ let mut out = ImageBuffer::new(self.inner.xstride, self.inner.ystride);
+ let borrowed = self.inner.image.deref();
+
+ for y in 0..self.inner.ystride {
+ for x in 0..self.inner.xstride {
+ let p = borrowed.get_pixel(x + self.inner.xoffset, y + self.inner.yoffset);
+ out.put_pixel(x, y, p);
+ }
+ }
+
+ out
+ }
+}
+
+/// Methods for readable images.
+impl<I> SubImage<I>
+where
+ I: Deref,
+ I::Target: GenericImageView,
+{
+ /// Create a sub-view of the image.
+ ///
+ /// The coordinates given are relative to the current view on the underlying image.
+ ///
+ /// Note that this method is preferred to the one from `GenericImageView`. This is accessible
+ /// with the explicit method call syntax but it should rarely be needed due to causing an
+ /// extra level of indirection.
+ ///
+ /// ```
+ /// use image::{GenericImageView, RgbImage, SubImage};
+ /// let buffer = RgbImage::new(10, 10);
+ ///
+ /// let subimage: SubImage<&RgbImage> = buffer.view(0, 0, 10, 10);
+ /// let subview: SubImage<&RgbImage> = subimage.view(0, 0, 10, 10);
+ ///
+ /// // Less efficient and NOT &RgbImage
+ /// let _: SubImage<&_> = GenericImageView::view(&*subimage, 0, 0, 10, 10);
+ /// ```
+ pub fn view(&self, x: u32, y: u32, width: u32, height: u32) -> SubImage<&I::Target> {
+ use crate::GenericImageView as _;
+ assert!(x as u64 + width as u64 <= self.inner.width() as u64);
+ assert!(y as u64 + height as u64 <= self.inner.height() as u64);
+ let x = self.inner.xoffset + x;
+ let y = self.inner.yoffset + y;
+ SubImage::new(&*self.inner.image, x, y, width, height)
+ }
+
+ /// Get a reference to the underlying image.
+ pub fn inner(&self) -> &I::Target {
+ &self.inner.image
+ }
+}
+
+impl<I> SubImage<I>
+where
+ I: DerefMut,
+ I::Target: GenericImage,
+{
+ /// Create a mutable sub-view of the image.
+ ///
+ /// The coordinates given are relative to the current view on the underlying image.
+ pub fn sub_image(
+ &mut self,
+ x: u32,
+ y: u32,
+ width: u32,
+ height: u32,
+ ) -> SubImage<&mut I::Target> {
+ assert!(x as u64 + width as u64 <= self.inner.width() as u64);
+ assert!(y as u64 + height as u64 <= self.inner.height() as u64);
+ let x = self.inner.xoffset + x;
+ let y = self.inner.yoffset + y;
+ SubImage::new(&mut *self.inner.image, x, y, width, height)
+ }
+
+ /// Get a mutable reference to the underlying image.
+ pub fn inner_mut(&mut self) -> &mut I::Target {
+ &mut self.inner.image
+ }
+}
+
+impl<I> Deref for SubImage<I>
+where
+ I: Deref,
+{
+ type Target = SubImageInner<I>;
+ fn deref(&self) -> &Self::Target {
+ &self.inner
+ }
+}
+
+impl<I> DerefMut for SubImage<I>
+where
+ I: DerefMut,
+{
+ fn deref_mut(&mut self) -> &mut Self::Target {
+ &mut self.inner
+ }
+}
+
+#[allow(deprecated)]
+impl<I> GenericImageView for SubImageInner<I>
+where
+ I: Deref,
+ I::Target: GenericImageView,
+{
+ type Pixel = DerefPixel<I>;
+
+ fn dimensions(&self) -> (u32, u32) {
+ (self.xstride, self.ystride)
+ }
+
+ fn bounds(&self) -> (u32, u32, u32, u32) {
+ (self.xoffset, self.yoffset, self.xstride, self.ystride)
+ }
+
+ fn get_pixel(&self, x: u32, y: u32) -> Self::Pixel {
+ self.image.get_pixel(x + self.xoffset, y + self.yoffset)
+ }
+}
+
+#[allow(deprecated)]
+impl<I> GenericImage for SubImageInner<I>
+where
+ I: DerefMut,
+ I::Target: GenericImage + Sized,
+{
+ fn get_pixel_mut(&mut self, x: u32, y: u32) -> &mut Self::Pixel {
+ self.image.get_pixel_mut(x + self.xoffset, y + self.yoffset)
+ }
+
+ fn put_pixel(&mut self, x: u32, y: u32, pixel: Self::Pixel) {
+ self.image
+ .put_pixel(x + self.xoffset, y + self.yoffset, pixel)
+ }
+
+ /// DEPRECATED: This method will be removed. Blend the pixel directly instead.
+ fn blend_pixel(&mut self, x: u32, y: u32, pixel: Self::Pixel) {
+ self.image
+ .blend_pixel(x + self.xoffset, y + self.yoffset, pixel)
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use std::io;
+ use std::path::Path;
+
+ use super::{
+ load_rect, ColorType, GenericImage, GenericImageView, ImageDecoder, ImageFormat,
+ ImageResult,
+ };
+ use crate::color::Rgba;
+ use crate::math::Rect;
+ use crate::{GrayImage, ImageBuffer};
+
+ #[test]
+ #[allow(deprecated)]
+ /// Test that alpha blending works as expected
+ fn test_image_alpha_blending() {
+ let mut target = ImageBuffer::new(1, 1);
+ target.put_pixel(0, 0, Rgba([255u8, 0, 0, 255]));
+ assert!(*target.get_pixel(0, 0) == Rgba([255, 0, 0, 255]));
+ target.blend_pixel(0, 0, Rgba([0, 255, 0, 255]));
+ assert!(*target.get_pixel(0, 0) == Rgba([0, 255, 0, 255]));
+
+ // Blending an alpha channel onto a solid background
+ target.blend_pixel(0, 0, Rgba([255, 0, 0, 127]));
+ assert!(*target.get_pixel(0, 0) == Rgba([127, 127, 0, 255]));
+
+ // Blending two alpha channels
+ target.put_pixel(0, 0, Rgba([0, 255, 0, 127]));
+ target.blend_pixel(0, 0, Rgba([255, 0, 0, 127]));
+ assert!(*target.get_pixel(0, 0) == Rgba([169, 85, 0, 190]));
+ }
+
+ #[test]
+ fn test_in_bounds() {
+ let mut target = ImageBuffer::new(2, 2);
+ target.put_pixel(0, 0, Rgba([255u8, 0, 0, 255]));
+
+ assert!(target.in_bounds(0, 0));
+ assert!(target.in_bounds(1, 0));
+ assert!(target.in_bounds(0, 1));
+ assert!(target.in_bounds(1, 1));
+
+ assert!(!target.in_bounds(2, 0));
+ assert!(!target.in_bounds(0, 2));
+ assert!(!target.in_bounds(2, 2));
+ }
+
+ #[test]
+ fn test_can_subimage_clone_nonmut() {
+ let mut source = ImageBuffer::new(3, 3);
+ source.put_pixel(1, 1, Rgba([255u8, 0, 0, 255]));
+
+ // A non-mutable copy of the source image
+ let source = source.clone();
+
+ // Clone a view into non-mutable to a separate buffer
+ let cloned = source.view(1, 1, 1, 1).to_image();
+
+ assert!(cloned.get_pixel(0, 0) == source.get_pixel(1, 1));
+ }
+
+ #[test]
+ fn test_can_nest_views() {
+ let mut source = ImageBuffer::from_pixel(3, 3, Rgba([255u8, 0, 0, 255]));
+
+ {
+ let mut sub1 = source.sub_image(0, 0, 2, 2);
+ let mut sub2 = sub1.sub_image(1, 1, 1, 1);
+ sub2.put_pixel(0, 0, Rgba([0, 0, 0, 0]));
+ }
+
+ assert_eq!(*source.get_pixel(1, 1), Rgba([0, 0, 0, 0]));
+
+ let view1 = source.view(0, 0, 2, 2);
+ assert_eq!(*source.get_pixel(1, 1), view1.get_pixel(1, 1));
+
+ let view2 = view1.view(1, 1, 1, 1);
+ assert_eq!(*source.get_pixel(1, 1), view2.get_pixel(0, 0));
+ }
+
+ #[test]
+ #[should_panic]
+ fn test_view_out_of_bounds() {
+ let source = ImageBuffer::from_pixel(3, 3, Rgba([255u8, 0, 0, 255]));
+ source.view(1, 1, 3, 3);
+ }
+
+ #[test]
+ #[should_panic]
+ fn test_view_coordinates_out_of_bounds() {
+ let source = ImageBuffer::from_pixel(3, 3, Rgba([255u8, 0, 0, 255]));
+ source.view(3, 3, 3, 3);
+ }
+
+ #[test]
+ #[should_panic]
+ fn test_view_width_out_of_bounds() {
+ let source = ImageBuffer::from_pixel(3, 3, Rgba([255u8, 0, 0, 255]));
+ source.view(1, 1, 3, 2);
+ }
+
+ #[test]
+ #[should_panic]
+ fn test_view_height_out_of_bounds() {
+ let source = ImageBuffer::from_pixel(3, 3, Rgba([255u8, 0, 0, 255]));
+ source.view(1, 1, 2, 3);
+ }
+
+ #[test]
+ #[should_panic]
+ fn test_view_x_out_of_bounds() {
+ let source = ImageBuffer::from_pixel(3, 3, Rgba([255u8, 0, 0, 255]));
+ source.view(3, 1, 3, 3);
+ }
+
+ #[test]
+ #[should_panic]
+ fn test_view_y_out_of_bounds() {
+ let source = ImageBuffer::from_pixel(3, 3, Rgba([255u8, 0, 0, 255]));
+ source.view(1, 3, 3, 3);
+ }
+
+ #[test]
+ fn test_view_in_bounds() {
+ let source = ImageBuffer::from_pixel(3, 3, Rgba([255u8, 0, 0, 255]));
+ source.view(0, 0, 3, 3);
+ source.view(1, 1, 2, 2);
+ source.view(2, 2, 0, 0);
+ }
+
+ #[test]
+ fn test_copy_sub_image() {
+ let source = ImageBuffer::from_pixel(3, 3, Rgba([255u8, 0, 0, 255]));
+ let view = source.view(0, 0, 3, 3);
+ let mut views = Vec::new();
+ views.push(view);
+ view.to_image();
+ }
+
+ #[test]
+ fn test_load_rect() {
+ struct MockDecoder {
+ scanline_number: u64,
+ scanline_bytes: u64,
+ }
+ impl<'a> ImageDecoder<'a> for MockDecoder {
+ type Reader = Box<dyn io::Read>;
+ fn dimensions(&self) -> (u32, u32) {
+ (5, 5)
+ }
+ fn color_type(&self) -> ColorType {
+ ColorType::L8
+ }
+ fn into_reader(self) -> ImageResult<Self::Reader> {
+ unimplemented!()
+ }
+ fn scanline_bytes(&self) -> u64 {
+ self.scanline_bytes
+ }
+ }
+
+ const DATA: [u8; 25] = [
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
+ 24,
+ ];
+
+ fn seek_scanline(m: &mut MockDecoder, n: u64) -> io::Result<()> {
+ m.scanline_number = n;
+ Ok(())
+ }
+ fn read_scanline(m: &mut MockDecoder, buf: &mut [u8]) -> io::Result<()> {
+ let bytes_read = m.scanline_number * m.scanline_bytes;
+ if bytes_read >= 25 {
+ return Ok(());
+ }
+
+ let len = m.scanline_bytes.min(25 - bytes_read);
+ buf[..(len as usize)].copy_from_slice(&DATA[(bytes_read as usize)..][..(len as usize)]);
+ m.scanline_number += 1;
+ Ok(())
+ }
+
+ for scanline_bytes in 1..30 {
+ let mut output = [0u8; 26];
+
+ load_rect(
+ 0,
+ 0,
+ 5,
+ 5,
+ &mut output,
+ |_| {},
+ &mut MockDecoder {
+ scanline_number: 0,
+ scanline_bytes,
+ },
+ seek_scanline,
+ read_scanline,
+ )
+ .unwrap();
+ assert_eq!(output[0..25], DATA);
+ assert_eq!(output[25], 0);
+
+ output = [0u8; 26];
+ load_rect(
+ 3,
+ 2,
+ 1,
+ 1,
+ &mut output,
+ |_| {},
+ &mut MockDecoder {
+ scanline_number: 0,
+ scanline_bytes,
+ },
+ seek_scanline,
+ read_scanline,
+ )
+ .unwrap();
+ assert_eq!(output[0..2], [13, 0]);
+
+ output = [0u8; 26];
+ load_rect(
+ 3,
+ 2,
+ 2,
+ 2,
+ &mut output,
+ |_| {},
+ &mut MockDecoder {
+ scanline_number: 0,
+ scanline_bytes,
+ },
+ seek_scanline,
+ read_scanline,
+ )
+ .unwrap();
+ assert_eq!(output[0..5], [13, 14, 18, 19, 0]);
+
+ output = [0u8; 26];
+ load_rect(
+ 1,
+ 1,
+ 2,
+ 4,
+ &mut output,
+ |_| {},
+ &mut MockDecoder {
+ scanline_number: 0,
+ scanline_bytes,
+ },
+ seek_scanline,
+ read_scanline,
+ )
+ .unwrap();
+ assert_eq!(output[0..9], [6, 7, 11, 12, 16, 17, 21, 22, 0]);
+ }
+ }
+
+ #[test]
+ fn test_load_rect_single_scanline() {
+ const DATA: [u8; 25] = [
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
+ 24,
+ ];
+
+ struct MockDecoder;
+ impl<'a> ImageDecoder<'a> for MockDecoder {
+ type Reader = Box<dyn io::Read>;
+ fn dimensions(&self) -> (u32, u32) {
+ (5, 5)
+ }
+ fn color_type(&self) -> ColorType {
+ ColorType::L8
+ }
+ fn into_reader(self) -> ImageResult<Self::Reader> {
+ unimplemented!()
+ }
+ fn scanline_bytes(&self) -> u64 {
+ 25
+ }
+ }
+
+ // Ensure that seek scanline is called only once.
+ let mut seeks = 0;
+ let seek_scanline = |_d: &mut MockDecoder, n: u64| -> io::Result<()> {
+ seeks += 1;
+ assert_eq!(n, 0);
+ assert_eq!(seeks, 1);
+ Ok(())
+ };
+
+ fn read_scanline(_m: &mut MockDecoder, buf: &mut [u8]) -> io::Result<()> {
+ buf.copy_from_slice(&DATA);
+ Ok(())
+ }
+
+ let mut output = [0; 26];
+ load_rect(
+ 1,
+ 1,
+ 2,
+ 4,
+ &mut output,
+ |_| {},
+ &mut MockDecoder,
+ seek_scanline,
+ read_scanline,
+ )
+ .unwrap();
+ assert_eq!(output[0..9], [6, 7, 11, 12, 16, 17, 21, 22, 0]);
+ }
+
+ #[test]
+ fn test_image_format_from_path() {
+ fn from_path(s: &str) -> ImageResult<ImageFormat> {
+ ImageFormat::from_path(Path::new(s))
+ }
+ assert_eq!(from_path("./a.jpg").unwrap(), ImageFormat::Jpeg);
+ assert_eq!(from_path("./a.jpeg").unwrap(), ImageFormat::Jpeg);
+ assert_eq!(from_path("./a.JPEG").unwrap(), ImageFormat::Jpeg);
+ assert_eq!(from_path("./a.pNg").unwrap(), ImageFormat::Png);
+ assert_eq!(from_path("./a.gif").unwrap(), ImageFormat::Gif);
+ assert_eq!(from_path("./a.webp").unwrap(), ImageFormat::WebP);
+ assert_eq!(from_path("./a.tiFF").unwrap(), ImageFormat::Tiff);
+ assert_eq!(from_path("./a.tif").unwrap(), ImageFormat::Tiff);
+ assert_eq!(from_path("./a.tga").unwrap(), ImageFormat::Tga);
+ assert_eq!(from_path("./a.dds").unwrap(), ImageFormat::Dds);
+ assert_eq!(from_path("./a.bmp").unwrap(), ImageFormat::Bmp);
+ assert_eq!(from_path("./a.Ico").unwrap(), ImageFormat::Ico);
+ assert_eq!(from_path("./a.hdr").unwrap(), ImageFormat::Hdr);
+ assert_eq!(from_path("./a.exr").unwrap(), ImageFormat::OpenExr);
+ assert_eq!(from_path("./a.pbm").unwrap(), ImageFormat::Pnm);
+ assert_eq!(from_path("./a.pAM").unwrap(), ImageFormat::Pnm);
+ assert_eq!(from_path("./a.Ppm").unwrap(), ImageFormat::Pnm);
+ assert_eq!(from_path("./a.pgm").unwrap(), ImageFormat::Pnm);
+ assert_eq!(from_path("./a.AViF").unwrap(), ImageFormat::Avif);
+ assert!(from_path("./a.txt").is_err());
+ assert!(from_path("./a").is_err());
+ }
+
+ #[test]
+ fn test_generic_image_copy_within_oob() {
+ let mut image: GrayImage = ImageBuffer::from_raw(4, 4, vec![0u8; 16]).unwrap();
+ assert!(!image.sub_image(0, 0, 4, 4).copy_within(
+ Rect {
+ x: 0,
+ y: 0,
+ width: 5,
+ height: 4
+ },
+ 0,
+ 0
+ ));
+ assert!(!image.sub_image(0, 0, 4, 4).copy_within(
+ Rect {
+ x: 0,
+ y: 0,
+ width: 4,
+ height: 5
+ },
+ 0,
+ 0
+ ));
+ assert!(!image.sub_image(0, 0, 4, 4).copy_within(
+ Rect {
+ x: 1,
+ y: 0,
+ width: 4,
+ height: 4
+ },
+ 0,
+ 0
+ ));
+ assert!(!image.sub_image(0, 0, 4, 4).copy_within(
+ Rect {
+ x: 0,
+ y: 0,
+ width: 4,
+ height: 4
+ },
+ 1,
+ 0
+ ));
+ assert!(!image.sub_image(0, 0, 4, 4).copy_within(
+ Rect {
+ x: 0,
+ y: 1,
+ width: 4,
+ height: 4
+ },
+ 0,
+ 0
+ ));
+ assert!(!image.sub_image(0, 0, 4, 4).copy_within(
+ Rect {
+ x: 0,
+ y: 0,
+ width: 4,
+ height: 4
+ },
+ 0,
+ 1
+ ));
+ assert!(!image.sub_image(0, 0, 4, 4).copy_within(
+ Rect {
+ x: 1,
+ y: 1,
+ width: 4,
+ height: 4
+ },
+ 0,
+ 0
+ ));
+ }
+
+ #[test]
+ fn test_generic_image_copy_within_tl() {
+ let data = &[
+ 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15,
+ ];
+ let expected = [
+ 00, 01, 02, 03, 04, 00, 01, 02, 08, 04, 05, 06, 12, 08, 09, 10,
+ ];
+ let mut image: GrayImage = ImageBuffer::from_raw(4, 4, Vec::from(&data[..])).unwrap();
+ assert!(image.sub_image(0, 0, 4, 4).copy_within(
+ Rect {
+ x: 0,
+ y: 0,
+ width: 3,
+ height: 3
+ },
+ 1,
+ 1
+ ));
+ assert_eq!(&image.into_raw(), &expected);
+ }
+
+ #[test]
+ fn test_generic_image_copy_within_tr() {
+ let data = &[
+ 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15,
+ ];
+ let expected = [
+ 00, 01, 02, 03, 01, 02, 03, 07, 05, 06, 07, 11, 09, 10, 11, 15,
+ ];
+ let mut image: GrayImage = ImageBuffer::from_raw(4, 4, Vec::from(&data[..])).unwrap();
+ assert!(image.sub_image(0, 0, 4, 4).copy_within(
+ Rect {
+ x: 1,
+ y: 0,
+ width: 3,
+ height: 3
+ },
+ 0,
+ 1
+ ));
+ assert_eq!(&image.into_raw(), &expected);
+ }
+
+ #[test]
+ fn test_generic_image_copy_within_bl() {
+ let data = &[
+ 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15,
+ ];
+ let expected = [
+ 00, 04, 05, 06, 04, 08, 09, 10, 08, 12, 13, 14, 12, 13, 14, 15,
+ ];
+ let mut image: GrayImage = ImageBuffer::from_raw(4, 4, Vec::from(&data[..])).unwrap();
+ assert!(image.sub_image(0, 0, 4, 4).copy_within(
+ Rect {
+ x: 0,
+ y: 1,
+ width: 3,
+ height: 3
+ },
+ 1,
+ 0
+ ));
+ assert_eq!(&image.into_raw(), &expected);
+ }
+
+ #[test]
+ fn test_generic_image_copy_within_br() {
+ let data = &[
+ 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15,
+ ];
+ let expected = [
+ 05, 06, 07, 03, 09, 10, 11, 07, 13, 14, 15, 11, 12, 13, 14, 15,
+ ];
+ let mut image: GrayImage = ImageBuffer::from_raw(4, 4, Vec::from(&data[..])).unwrap();
+ assert!(image.sub_image(0, 0, 4, 4).copy_within(
+ Rect {
+ x: 1,
+ y: 1,
+ width: 3,
+ height: 3
+ },
+ 0,
+ 0
+ ));
+ assert_eq!(&image.into_raw(), &expected);
+ }
+
+ #[test]
+ fn image_formats_are_recognized() {
+ use ImageFormat::*;
+ const ALL_FORMATS: &'static [ImageFormat] = &[
+ Avif, Png, Jpeg, Gif, WebP, Pnm, Tiff, Tga, Dds, Bmp, Ico, Hdr, Farbfeld, OpenExr,
+ ];
+ for &format in ALL_FORMATS {
+ let mut file = Path::new("file.nothing").to_owned();
+ for ext in format.extensions_str() {
+ assert!(file.set_extension(ext));
+ match ImageFormat::from_path(&file) {
+ Err(_) => panic!("Path {} not recognized as {:?}", file.display(), format),
+ Ok(result) => assert_eq!(format, result),
+ }
+ }
+ }
+ }
+
+ #[test]
+ fn total_bytes_overflow() {
+ struct D;
+ impl<'a> ImageDecoder<'a> for D {
+ type Reader = std::io::Cursor<Vec<u8>>;
+ fn color_type(&self) -> ColorType {
+ ColorType::Rgb8
+ }
+ fn dimensions(&self) -> (u32, u32) {
+ (0xffffffff, 0xffffffff)
+ }
+ fn into_reader(self) -> ImageResult<Self::Reader> {
+ unreachable!()
+ }
+ }
+ assert_eq!(D.total_bytes(), u64::max_value());
+
+ let v: ImageResult<Vec<u8>> = super::decoder_to_vec(D);
+ assert!(v.is_err());
+ }
+}
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