Deleted vendor folder

1 files changed, 0 insertions, 1074 deletions

diff --git a/vendor/image/src/codecs/jpeg/encoder.rs b/vendor/image/src/codecs/jpeg/encoder.rs
deleted file mode 100644
index edb2a05..0000000
--- a/vendor/image/src/codecs/jpeg/encoder.rs
+++ /dev/null
@@ -1,1074 +0,0 @@
-#![allow(clippy::too_many_arguments)]
-
-use std::borrow::Cow;
-use std::convert::TryFrom;
-use std::io::{self, Write};
-
-use crate::error::{
-    ImageError, ImageResult, ParameterError, ParameterErrorKind, UnsupportedError,
-    UnsupportedErrorKind,
-};
-use crate::image::{ImageEncoder, ImageFormat};
-use crate::utils::clamp;
-use crate::{ColorType, GenericImageView, ImageBuffer, Luma, LumaA, Pixel, Rgb, Rgba};
-
-use super::entropy::build_huff_lut_const;
-use super::transform;
-use crate::traits::PixelWithColorType;
-
-// Markers
-// Baseline DCT
-static SOF0: u8 = 0xC0;
-// Huffman Tables
-static DHT: u8 = 0xC4;
-// Start of Image (standalone)
-static SOI: u8 = 0xD8;
-// End of image (standalone)
-static EOI: u8 = 0xD9;
-// Start of Scan
-static SOS: u8 = 0xDA;
-// Quantization Tables
-static DQT: u8 = 0xDB;
-// Application segments start and end
-static APP0: u8 = 0xE0;
-
-// section K.1
-// table K.1
-#[rustfmt::skip]
-static STD_LUMA_QTABLE: [u8; 64] = [
-    16, 11, 10, 16,  24,  40,  51,  61,
-    12, 12, 14, 19,  26,  58,  60,  55,
-    14, 13, 16, 24,  40,  57,  69,  56,
-    14, 17, 22, 29,  51,  87,  80,  62,
-    18, 22, 37, 56,  68, 109, 103,  77,
-    24, 35, 55, 64,  81, 104, 113,  92,
-    49, 64, 78, 87, 103, 121, 120, 101,
-    72, 92, 95, 98, 112, 100, 103,  99,
-];
-
-// table K.2
-#[rustfmt::skip]
-static STD_CHROMA_QTABLE: [u8; 64] = [
-    17, 18, 24, 47, 99, 99, 99, 99,
-    18, 21, 26, 66, 99, 99, 99, 99,
-    24, 26, 56, 99, 99, 99, 99, 99,
-    47, 66, 99, 99, 99, 99, 99, 99,
-    99, 99, 99, 99, 99, 99, 99, 99,
-    99, 99, 99, 99, 99, 99, 99, 99,
-    99, 99, 99, 99, 99, 99, 99, 99,
-    99, 99, 99, 99, 99, 99, 99, 99,
-];
-
-// section K.3
-// Code lengths and values for table K.3
-static STD_LUMA_DC_CODE_LENGTHS: [u8; 16] = [
-    0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-];
-
-static STD_LUMA_DC_VALUES: [u8; 12] = [
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
-];
-
-static STD_LUMA_DC_HUFF_LUT: [(u8, u16); 256] =
-    build_huff_lut_const(&STD_LUMA_DC_CODE_LENGTHS, &STD_LUMA_DC_VALUES);
-
-// Code lengths and values for table K.4
-static STD_CHROMA_DC_CODE_LENGTHS: [u8; 16] = [
-    0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
-];
-
-static STD_CHROMA_DC_VALUES: [u8; 12] = [
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
-];
-
-static STD_CHROMA_DC_HUFF_LUT: [(u8, u16); 256] =
-    build_huff_lut_const(&STD_CHROMA_DC_CODE_LENGTHS, &STD_CHROMA_DC_VALUES);
-
-// Code lengths and values for table k.5
-static STD_LUMA_AC_CODE_LENGTHS: [u8; 16] = [
-    0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7D,
-];
-
-static STD_LUMA_AC_VALUES: [u8; 162] = [
-    0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
-    0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1, 0x08, 0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0,
-    0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28,
-    0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
-    0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
-    0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
-    0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
-    0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5,
-    0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2,
-    0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
-    0xF9, 0xFA,
-];
-
-static STD_LUMA_AC_HUFF_LUT: [(u8, u16); 256] =
-    build_huff_lut_const(&STD_LUMA_AC_CODE_LENGTHS, &STD_LUMA_AC_VALUES);
-
-// Code lengths and values for table k.6
-static STD_CHROMA_AC_CODE_LENGTHS: [u8; 16] = [
-    0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77,
-];
-static STD_CHROMA_AC_VALUES: [u8; 162] = [
-    0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
-    0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0,
-    0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34, 0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26,
-    0x27, 0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
-    0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
-    0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
-    0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5,
-    0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3,
-    0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA,
-    0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
-    0xF9, 0xFA,
-];
-
-static STD_CHROMA_AC_HUFF_LUT: [(u8, u16); 256] =
-    build_huff_lut_const(&STD_CHROMA_AC_CODE_LENGTHS, &STD_CHROMA_AC_VALUES);
-
-static DCCLASS: u8 = 0;
-static ACCLASS: u8 = 1;
-
-static LUMADESTINATION: u8 = 0;
-static CHROMADESTINATION: u8 = 1;
-
-static LUMAID: u8 = 1;
-static CHROMABLUEID: u8 = 2;
-static CHROMAREDID: u8 = 3;
-
-/// The permutation of dct coefficients.
-#[rustfmt::skip]
-static UNZIGZAG: [u8; 64] = [
-     0,  1,  8, 16,  9,  2,  3, 10,
-    17, 24, 32, 25, 18, 11,  4,  5,
-    12, 19, 26, 33, 40, 48, 41, 34,
-    27, 20, 13,  6,  7, 14, 21, 28,
-    35, 42, 49, 56, 57, 50, 43, 36,
-    29, 22, 15, 23, 30, 37, 44, 51,
-    58, 59, 52, 45, 38, 31, 39, 46,
-    53, 60, 61, 54, 47, 55, 62, 63,
-];
-
-/// A representation of a JPEG component
-#[derive(Copy, Clone)]
-struct Component {
-    /// The Component's identifier
-    id: u8,
-
-    /// Horizontal sampling factor
-    h: u8,
-
-    /// Vertical sampling factor
-    v: u8,
-
-    /// The quantization table selector
-    tq: u8,
-
-    /// Index to the Huffman DC Table
-    dc_table: u8,
-
-    /// Index to the AC Huffman Table
-    ac_table: u8,
-
-    /// The dc prediction of the component
-    _dc_pred: i32,
-}
-
-pub(crate) struct BitWriter<W> {
-    w: W,
-    accumulator: u32,
-    nbits: u8,
-}
-
-impl<W: Write> BitWriter<W> {
-    fn new(w: W) -> Self {
-        BitWriter {
-            w,
-            accumulator: 0,
-            nbits: 0,
-        }
-    }
-
-    fn write_bits(&mut self, bits: u16, size: u8) -> io::Result<()> {
-        if size == 0 {
-            return Ok(());
-        }
-
-        self.nbits += size;
-        self.accumulator |= u32::from(bits) << (32 - self.nbits) as usize;
-
-        while self.nbits >= 8 {
-            let byte = self.accumulator >> 24;
-            self.w.write_all(&[byte as u8])?;
-
-            if byte == 0xFF {
-                self.w.write_all(&[0x00])?;
-            }
-
-            self.nbits -= 8;
-            self.accumulator <<= 8;
-        }
-
-        Ok(())
-    }
-
-    fn pad_byte(&mut self) -> io::Result<()> {
-        self.write_bits(0x7F, 7)
-    }
-
-    fn huffman_encode(&mut self, val: u8, table: &[(u8, u16); 256]) -> io::Result<()> {
-        let (size, code) = table[val as usize];
-
-        if size > 16 {
-            panic!("bad huffman value");
-        }
-
-        self.write_bits(code, size)
-    }
-
-    fn write_block(
-        &mut self,
-        block: &[i32; 64],
-        prevdc: i32,
-        dctable: &[(u8, u16); 256],
-        actable: &[(u8, u16); 256],
-    ) -> io::Result<i32> {
-        // Differential DC encoding
-        let dcval = block[0];
-        let diff = dcval - prevdc;
-        let (size, value) = encode_coefficient(diff);
-
-        self.huffman_encode(size, dctable)?;
-        self.write_bits(value, size)?;
-
-        // Figure F.2
-        let mut zero_run = 0;
-
-        for &k in &UNZIGZAG[1..] {
-            if block[k as usize] == 0 {
-                zero_run += 1;
-            } else {
-                while zero_run > 15 {
-                    self.huffman_encode(0xF0, actable)?;
-                    zero_run -= 16;
-                }
-
-                let (size, value) = encode_coefficient(block[k as usize]);
-                let symbol = (zero_run << 4) | size;
-
-                self.huffman_encode(symbol, actable)?;
-                self.write_bits(value, size)?;
-
-                zero_run = 0;
-            }
-        }
-
-        if block[UNZIGZAG[63] as usize] == 0 {
-            self.huffman_encode(0x00, actable)?;
-        }
-
-        Ok(dcval)
-    }
-
-    fn write_marker(&mut self, marker: u8) -> io::Result<()> {
-        self.w.write_all(&[0xFF, marker])
-    }
-
-    fn write_segment(&mut self, marker: u8, data: &[u8]) -> io::Result<()> {
-        self.w.write_all(&[0xFF, marker])?;
-        self.w.write_all(&(data.len() as u16 + 2).to_be_bytes())?;
-        self.w.write_all(data)
-    }
-}
-
-/// Represents a unit in which the density of an image is measured
-#[derive(Clone, Copy, Debug, Eq, PartialEq)]
-pub enum PixelDensityUnit {
-    /// Represents the absence of a unit, the values indicate only a
-    /// [pixel aspect ratio](https://en.wikipedia.org/wiki/Pixel_aspect_ratio)
-    PixelAspectRatio,
-
-    /// Pixels per inch (2.54 cm)
-    Inches,
-
-    /// Pixels per centimeter
-    Centimeters,
-}
-
-/// Represents the pixel density of an image
-///
-/// For example, a 300 DPI image is represented by:
-///
-/// ```rust
-/// use image::codecs::jpeg::*;
-/// let hdpi = PixelDensity::dpi(300);
-/// assert_eq!(hdpi, PixelDensity {density: (300,300), unit: PixelDensityUnit::Inches})
-/// ```
-#[derive(Clone, Copy, Debug, Eq, PartialEq)]
-pub struct PixelDensity {
-    /// A couple of values for (Xdensity, Ydensity)
-    pub density: (u16, u16),
-    /// The unit in which the density is measured
-    pub unit: PixelDensityUnit,
-}
-
-impl PixelDensity {
-    /// Creates the most common pixel density type:
-    /// the horizontal and the vertical density are equal,
-    /// and measured in pixels per inch.
-    pub fn dpi(density: u16) -> Self {
-        PixelDensity {
-            density: (density, density),
-            unit: PixelDensityUnit::Inches,
-        }
-    }
-}
-
-impl Default for PixelDensity {
-    /// Returns a pixel density with a pixel aspect ratio of 1
-    fn default() -> Self {
-        PixelDensity {
-            density: (1, 1),
-            unit: PixelDensityUnit::PixelAspectRatio,
-        }
-    }
-}
-
-/// The representation of a JPEG encoder
-pub struct JpegEncoder<W> {
-    writer: BitWriter<W>,
-
-    components: Vec<Component>,
-    tables: Vec<[u8; 64]>,
-
-    luma_dctable: Cow<'static, [(u8, u16); 256]>,
-    luma_actable: Cow<'static, [(u8, u16); 256]>,
-    chroma_dctable: Cow<'static, [(u8, u16); 256]>,
-    chroma_actable: Cow<'static, [(u8, u16); 256]>,
-
-    pixel_density: PixelDensity,
-}
-
-impl<W: Write> JpegEncoder<W> {
-    /// Create a new encoder that writes its output to ```w```
-    pub fn new(w: W) -> JpegEncoder<W> {
-        JpegEncoder::new_with_quality(w, 75)
-    }
-
-    /// Create a new encoder that writes its output to ```w```, and has
-    /// the quality parameter ```quality``` with a value in the range 1-100
-    /// where 1 is the worst and 100 is the best.
-    pub fn new_with_quality(w: W, quality: u8) -> JpegEncoder<W> {
-        let components = vec![
-            Component {
-                id: LUMAID,
-                h: 1,
-                v: 1,
-                tq: LUMADESTINATION,
-                dc_table: LUMADESTINATION,
-                ac_table: LUMADESTINATION,
-                _dc_pred: 0,
-            },
-            Component {
-                id: CHROMABLUEID,
-                h: 1,
-                v: 1,
-                tq: CHROMADESTINATION,
-                dc_table: CHROMADESTINATION,
-                ac_table: CHROMADESTINATION,
-                _dc_pred: 0,
-            },
-            Component {
-                id: CHROMAREDID,
-                h: 1,
-                v: 1,
-                tq: CHROMADESTINATION,
-                dc_table: CHROMADESTINATION,
-                ac_table: CHROMADESTINATION,
-                _dc_pred: 0,
-            },
-        ];
-
-        // Derive our quantization table scaling value using the libjpeg algorithm
-        let scale = u32::from(clamp(quality, 1, 100));
-        let scale = if scale < 50 {
-            5000 / scale
-        } else {
-            200 - scale * 2
-        };
-
-        let mut tables = vec![STD_LUMA_QTABLE, STD_CHROMA_QTABLE];
-        tables.iter_mut().for_each(|t| {
-            t.iter_mut().for_each(|v| {
-                *v = clamp(
-                    (u32::from(*v) * scale + 50) / 100,
-                    1,
-                    u32::from(u8::max_value()),
-                ) as u8;
-            })
-        });
-
-        JpegEncoder {
-            writer: BitWriter::new(w),
-
-            components,
-            tables,
-
-            luma_dctable: Cow::Borrowed(&STD_LUMA_DC_HUFF_LUT),
-            luma_actable: Cow::Borrowed(&STD_LUMA_AC_HUFF_LUT),
-            chroma_dctable: Cow::Borrowed(&STD_CHROMA_DC_HUFF_LUT),
-            chroma_actable: Cow::Borrowed(&STD_CHROMA_AC_HUFF_LUT),
-
-            pixel_density: PixelDensity::default(),
-        }
-    }
-
-    /// Set the pixel density of the images the encoder will encode.
-    /// If this method is not called, then a default pixel aspect ratio of 1x1 will be applied,
-    /// and no DPI information will be stored in the image.
-    pub fn set_pixel_density(&mut self, pixel_density: PixelDensity) {
-        self.pixel_density = pixel_density;
-    }
-
-    /// Encodes the image stored in the raw byte buffer ```image```
-    /// that has dimensions ```width``` and ```height```
-    /// and ```ColorType``` ```c```
-    ///
-    /// The Image in encoded with subsampling ratio 4:2:2
-    pub fn encode(
-        &mut self,
-        image: &[u8],
-        width: u32,
-        height: u32,
-        color_type: ColorType,
-    ) -> ImageResult<()> {
-        match color_type {
-            ColorType::L8 => {
-                let image: ImageBuffer<Luma<_>, _> =
-                    ImageBuffer::from_raw(width, height, image).unwrap();
-                self.encode_image(&image)
-            }
-            ColorType::La8 => {
-                let image: ImageBuffer<LumaA<_>, _> =
-                    ImageBuffer::from_raw(width, height, image).unwrap();
-                self.encode_image(&image)
-            }
-            ColorType::Rgb8 => {
-                let image: ImageBuffer<Rgb<_>, _> =
-                    ImageBuffer::from_raw(width, height, image).unwrap();
-                self.encode_image(&image)
-            }
-            ColorType::Rgba8 => {
-                let image: ImageBuffer<Rgba<_>, _> =
-                    ImageBuffer::from_raw(width, height, image).unwrap();
-                self.encode_image(&image)
-            }
-            _ => Err(ImageError::Unsupported(
-                UnsupportedError::from_format_and_kind(
-                    ImageFormat::Jpeg.into(),
-                    UnsupportedErrorKind::Color(color_type.into()),
-                ),
-            )),
-        }
-    }
-
-    /// Encodes the given image.
-    ///
-    /// As a special feature this does not require the whole image to be present in memory at the
-    /// same time such that it may be computed on the fly, which is why this method exists on this
-    /// encoder but not on others. Instead the encoder will iterate over 8-by-8 blocks of pixels at
-    /// a time, inspecting each pixel exactly once. You can rely on this behaviour when calling
-    /// this method.
-    ///
-    /// The Image in encoded with subsampling ratio 4:2:2
-    pub fn encode_image<I: GenericImageView>(&mut self, image: &I) -> ImageResult<()>
-    where
-        I::Pixel: PixelWithColorType,
-    {
-        let n = I::Pixel::CHANNEL_COUNT;
-        let color_type = I::Pixel::COLOR_TYPE;
-        let num_components = if n == 1 || n == 2 { 1 } else { 3 };
-
-        self.writer.write_marker(SOI)?;
-
-        let mut buf = Vec::new();
-
-        build_jfif_header(&mut buf, self.pixel_density);
-        self.writer.write_segment(APP0, &buf)?;
-
-        build_frame_header(
-            &mut buf,
-            8,
-            // TODO: not idiomatic yet. Should be an EncodingError and mention jpg. Further it
-            // should check dimensions prior to writing.
-            u16::try_from(image.width()).map_err(|_| {
-                ImageError::Parameter(ParameterError::from_kind(
-                    ParameterErrorKind::DimensionMismatch,
-                ))
-            })?,
-            u16::try_from(image.height()).map_err(|_| {
-                ImageError::Parameter(ParameterError::from_kind(
-                    ParameterErrorKind::DimensionMismatch,
-                ))
-            })?,
-            &self.components[..num_components],
-        );
-        self.writer.write_segment(SOF0, &buf)?;
-
-        assert_eq!(self.tables.len(), 2);
-        let numtables = if num_components == 1 { 1 } else { 2 };
-
-        for (i, table) in self.tables[..numtables].iter().enumerate() {
-            build_quantization_segment(&mut buf, 8, i as u8, table);
-            self.writer.write_segment(DQT, &buf)?;
-        }
-
-        build_huffman_segment(
-            &mut buf,
-            DCCLASS,
-            LUMADESTINATION,
-            &STD_LUMA_DC_CODE_LENGTHS,
-            &STD_LUMA_DC_VALUES,
-        );
-        self.writer.write_segment(DHT, &buf)?;
-
-        build_huffman_segment(
-            &mut buf,
-            ACCLASS,
-            LUMADESTINATION,
-            &STD_LUMA_AC_CODE_LENGTHS,
-            &STD_LUMA_AC_VALUES,
-        );
-        self.writer.write_segment(DHT, &buf)?;
-
-        if num_components == 3 {
-            build_huffman_segment(
-                &mut buf,
-                DCCLASS,
-                CHROMADESTINATION,
-                &STD_CHROMA_DC_CODE_LENGTHS,
-                &STD_CHROMA_DC_VALUES,
-            );
-            self.writer.write_segment(DHT, &buf)?;
-
-            build_huffman_segment(
-                &mut buf,
-                ACCLASS,
-                CHROMADESTINATION,
-                &STD_CHROMA_AC_CODE_LENGTHS,
-                &STD_CHROMA_AC_VALUES,
-            );
-            self.writer.write_segment(DHT, &buf)?;
-        }
-
-        build_scan_header(&mut buf, &self.components[..num_components]);
-        self.writer.write_segment(SOS, &buf)?;
-
-        if color_type.has_color() {
-            self.encode_rgb(image)
-        } else {
-            self.encode_gray(image)
-        }?;
-
-        self.writer.pad_byte()?;
-        self.writer.write_marker(EOI)?;
-        Ok(())
-    }
-
-    fn encode_gray<I: GenericImageView>(&mut self, image: &I) -> io::Result<()> {
-        let mut yblock = [0u8; 64];
-        let mut y_dcprev = 0;
-        let mut dct_yblock = [0i32; 64];
-
-        for y in (0..image.height()).step_by(8) {
-            for x in (0..image.width()).step_by(8) {
-                copy_blocks_gray(image, x, y, &mut yblock);
-
-                // Level shift and fdct
-                // Coeffs are scaled by 8
-                transform::fdct(&yblock, &mut dct_yblock);
-
-                // Quantization
-                for (i, dct) in dct_yblock.iter_mut().enumerate() {
-                    *dct = ((*dct / 8) as f32 / f32::from(self.tables[0][i])).round() as i32;
-                }
-
-                let la = &*self.luma_actable;
-                let ld = &*self.luma_dctable;
-
-                y_dcprev = self.writer.write_block(&dct_yblock, y_dcprev, ld, la)?;
-            }
-        }
-
-        Ok(())
-    }
-
-    fn encode_rgb<I: GenericImageView>(&mut self, image: &I) -> io::Result<()> {
-        let mut y_dcprev = 0;
-        let mut cb_dcprev = 0;
-        let mut cr_dcprev = 0;
-
-        let mut dct_yblock = [0i32; 64];
-        let mut dct_cb_block = [0i32; 64];
-        let mut dct_cr_block = [0i32; 64];
-
-        let mut yblock = [0u8; 64];
-        let mut cb_block = [0u8; 64];
-        let mut cr_block = [0u8; 64];
-
-        for y in (0..image.height()).step_by(8) {
-            for x in (0..image.width()).step_by(8) {
-                // RGB -> YCbCr
-                copy_blocks_ycbcr(image, x, y, &mut yblock, &mut cb_block, &mut cr_block);
-
-                // Level shift and fdct
-                // Coeffs are scaled by 8
-                transform::fdct(&yblock, &mut dct_yblock);
-                transform::fdct(&cb_block, &mut dct_cb_block);
-                transform::fdct(&cr_block, &mut dct_cr_block);
-
-                // Quantization
-                for i in 0usize..64 {
-                    dct_yblock[i] =
-                        ((dct_yblock[i] / 8) as f32 / f32::from(self.tables[0][i])).round() as i32;
-                    dct_cb_block[i] = ((dct_cb_block[i] / 8) as f32 / f32::from(self.tables[1][i]))
-                        .round() as i32;
-                    dct_cr_block[i] = ((dct_cr_block[i] / 8) as f32 / f32::from(self.tables[1][i]))
-                        .round() as i32;
-                }
-
-                let la = &*self.luma_actable;
-                let ld = &*self.luma_dctable;
-                let cd = &*self.chroma_dctable;
-                let ca = &*self.chroma_actable;
-
-                y_dcprev = self.writer.write_block(&dct_yblock, y_dcprev, ld, la)?;
-                cb_dcprev = self.writer.write_block(&dct_cb_block, cb_dcprev, cd, ca)?;
-                cr_dcprev = self.writer.write_block(&dct_cr_block, cr_dcprev, cd, ca)?;
-            }
-        }
-
-        Ok(())
-    }
-}
-
-impl<W: Write> ImageEncoder for JpegEncoder<W> {
-    fn write_image(
-        mut self,
-        buf: &[u8],
-        width: u32,
-        height: u32,
-        color_type: ColorType,
-    ) -> ImageResult<()> {
-        self.encode(buf, width, height, color_type)
-    }
-}
-
-fn build_jfif_header(m: &mut Vec<u8>, density: PixelDensity) {
-    m.clear();
-    m.extend_from_slice(b"JFIF");
-    m.extend_from_slice(&[
-        0,
-        0x01,
-        0x02,
-        match density.unit {
-            PixelDensityUnit::PixelAspectRatio => 0x00,
-            PixelDensityUnit::Inches => 0x01,
-            PixelDensityUnit::Centimeters => 0x02,
-        },
-    ]);
-    m.extend_from_slice(&density.density.0.to_be_bytes());
-    m.extend_from_slice(&density.density.1.to_be_bytes());
-    m.extend_from_slice(&[0, 0]);
-}
-
-fn build_frame_header(
-    m: &mut Vec<u8>,
-    precision: u8,
-    width: u16,
-    height: u16,
-    components: &[Component],
-) {
-    m.clear();
-
-    m.push(precision);
-    m.extend_from_slice(&height.to_be_bytes());
-    m.extend_from_slice(&width.to_be_bytes());
-    m.push(components.len() as u8);
-
-    for &comp in components.iter() {
-        let hv = (comp.h << 4) | comp.v;
-        m.extend_from_slice(&[comp.id, hv, comp.tq]);
-    }
-}
-
-fn build_scan_header(m: &mut Vec<u8>, components: &[Component]) {
-    m.clear();
-
-    m.push(components.len() as u8);
-
-    for &comp in components.iter() {
-        let tables = (comp.dc_table << 4) | comp.ac_table;
-        m.extend_from_slice(&[comp.id, tables]);
-    }
-
-    // spectral start and end, approx. high and low
-    m.extend_from_slice(&[0, 63, 0]);
-}
-
-fn build_huffman_segment(
-    m: &mut Vec<u8>,
-    class: u8,
-    destination: u8,
-    numcodes: &[u8; 16],
-    values: &[u8],
-) {
-    m.clear();
-
-    let tcth = (class << 4) | destination;
-    m.push(tcth);
-
-    m.extend_from_slice(numcodes);
-
-    let sum: usize = numcodes.iter().map(|&x| x as usize).sum();
-
-    assert_eq!(sum, values.len());
-
-    m.extend_from_slice(values);
-}
-
-fn build_quantization_segment(m: &mut Vec<u8>, precision: u8, identifier: u8, qtable: &[u8; 64]) {
-    m.clear();
-
-    let p = if precision == 8 { 0 } else { 1 };
-
-    let pqtq = (p << 4) | identifier;
-    m.push(pqtq);
-
-    for &i in &UNZIGZAG[..] {
-        m.push(qtable[i as usize]);
-    }
-}
-
-fn encode_coefficient(coefficient: i32) -> (u8, u16) {
-    let mut magnitude = coefficient.unsigned_abs() as u16;
-    let mut num_bits = 0u8;
-
-    while magnitude > 0 {
-        magnitude >>= 1;
-        num_bits += 1;
-    }
-
-    let mask = (1 << num_bits as usize) - 1;
-
-    let val = if coefficient < 0 {
-        (coefficient - 1) as u16 & mask
-    } else {
-        coefficient as u16 & mask
-    };
-
-    (num_bits, val)
-}
-
-#[inline]
-fn rgb_to_ycbcr<P: Pixel>(pixel: P) -> (u8, u8, u8) {
-    use crate::traits::Primitive;
-    use num_traits::cast::ToPrimitive;
-
-    let [r, g, b] = pixel.to_rgb().0;
-    let max: f32 = P::Subpixel::DEFAULT_MAX_VALUE.to_f32().unwrap();
-    let r: f32 = r.to_f32().unwrap();
-    let g: f32 = g.to_f32().unwrap();
-    let b: f32 = b.to_f32().unwrap();
-
-    // Coefficients from JPEG File Interchange Format (Version 1.02), multiplied for 255 maximum.
-    let y = 76.245 / max * r + 149.685 / max * g + 29.07 / max * b;
-    let cb = -43.0185 / max * r - 84.4815 / max * g + 127.5 / max * b + 128.;
-    let cr = 127.5 / max * r - 106.7685 / max * g - 20.7315 / max * b + 128.;
-
-    (y as u8, cb as u8, cr as u8)
-}
-
-/// Returns the pixel at (x,y) if (x,y) is in the image,
-/// otherwise the closest pixel in the image
-#[inline]
-fn pixel_at_or_near<I: GenericImageView>(source: &I, x: u32, y: u32) -> I::Pixel {
-    if source.in_bounds(x, y) {
-        source.get_pixel(x, y)
-    } else {
-        source.get_pixel(x.min(source.width() - 1), y.min(source.height() - 1))
-    }
-}
-
-fn copy_blocks_ycbcr<I: GenericImageView>(
-    source: &I,
-    x0: u32,
-    y0: u32,
-    yb: &mut [u8; 64],
-    cbb: &mut [u8; 64],
-    crb: &mut [u8; 64],
-) {
-    for y in 0..8 {
-        for x in 0..8 {
-            let pixel = pixel_at_or_near(source, x + x0, y + y0);
-            let (yc, cb, cr) = rgb_to_ycbcr(pixel);
-
-            yb[(y * 8 + x) as usize] = yc;
-            cbb[(y * 8 + x) as usize] = cb;
-            crb[(y * 8 + x) as usize] = cr;
-        }
-    }
-}
-
-fn copy_blocks_gray<I: GenericImageView>(source: &I, x0: u32, y0: u32, gb: &mut [u8; 64]) {
-    use num_traits::cast::ToPrimitive;
-    for y in 0..8 {
-        for x in 0..8 {
-            let pixel = pixel_at_or_near(source, x0 + x, y0 + y);
-            let [luma] = pixel.to_luma().0;
-            gb[(y * 8 + x) as usize] = luma.to_u8().unwrap();
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use std::io::Cursor;
-
-    #[cfg(feature = "benchmarks")]
-    extern crate test;
-    #[cfg(feature = "benchmarks")]
-    use test::Bencher;
-
-    use crate::color::ColorType;
-    use crate::error::ParameterErrorKind::DimensionMismatch;
-    use crate::image::ImageDecoder;
-    use crate::{ImageEncoder, ImageError};
-
-    use super::super::JpegDecoder;
-    use super::{
-        build_frame_header, build_huffman_segment, build_jfif_header, build_quantization_segment,
-        build_scan_header, Component, JpegEncoder, PixelDensity, DCCLASS, LUMADESTINATION,
-        STD_LUMA_DC_CODE_LENGTHS, STD_LUMA_DC_VALUES,
-    };
-
-    fn decode(encoded: &[u8]) -> Vec<u8> {
-        let decoder = JpegDecoder::new(Cursor::new(encoded)).expect("Could not decode image");
-
-        let mut decoded = vec![0; decoder.total_bytes() as usize];
-        decoder
-            .read_image(&mut decoded)
-            .expect("Could not decode image");
-        decoded
-    }
-
-    #[test]
-    fn roundtrip_sanity_check() {
-        // create a 1x1 8-bit image buffer containing a single red pixel
-        let img = [255u8, 0, 0];
-
-        // encode it into a memory buffer
-        let mut encoded_img = Vec::new();
-        {
-            let encoder = JpegEncoder::new_with_quality(&mut encoded_img, 100);
-            encoder
-                .write_image(&img, 1, 1, ColorType::Rgb8)
-                .expect("Could not encode image");
-        }
-
-        // decode it from the memory buffer
-        {
-            let decoded = decode(&encoded_img);
-            // note that, even with the encode quality set to 100, we do not get the same image
-            // back. Therefore, we're going to assert that it's at least red-ish:
-            assert_eq!(3, decoded.len());
-            assert!(decoded[0] > 0x80);
-            assert!(decoded[1] < 0x80);
-            assert!(decoded[2] < 0x80);
-        }
-    }
-
-    #[test]
-    fn grayscale_roundtrip_sanity_check() {
-        // create a 2x2 8-bit image buffer containing a white diagonal
-        let img = [255u8, 0, 0, 255];
-
-        // encode it into a memory buffer
-        let mut encoded_img = Vec::new();
-        {
-            let encoder = JpegEncoder::new_with_quality(&mut encoded_img, 100);
-            encoder
-                .write_image(&img[..], 2, 2, ColorType::L8)
-                .expect("Could not encode image");
-        }
-
-        // decode it from the memory buffer
-        {
-            let decoded = decode(&encoded_img);
-            // note that, even with the encode quality set to 100, we do not get the same image
-            // back. Therefore, we're going to assert that the diagonal is at least white-ish:
-            assert_eq!(4, decoded.len());
-            assert!(decoded[0] > 0x80);
-            assert!(decoded[1] < 0x80);
-            assert!(decoded[2] < 0x80);
-            assert!(decoded[3] > 0x80);
-        }
-    }
-
-    #[test]
-    fn jfif_header_density_check() {
-        let mut buffer = Vec::new();
-        build_jfif_header(&mut buffer, PixelDensity::dpi(300));
-        assert_eq!(
-            buffer,
-            vec![
-                b'J',
-                b'F',
-                b'I',
-                b'F',
-                0,
-                1,
-                2, // JFIF version 1.2
-                1, // density is in dpi
-                300u16.to_be_bytes()[0],
-                300u16.to_be_bytes()[1],
-                300u16.to_be_bytes()[0],
-                300u16.to_be_bytes()[1],
-                0,
-                0, // No thumbnail
-            ]
-        );
-    }
-
-    #[test]
-    fn test_image_too_large() {
-        // JPEG cannot encode images larger than 65,535×65,535
-        // create a 65,536×1 8-bit black image buffer
-        let img = [0; 65_536];
-        // Try to encode an image that is too large
-        let mut encoded = Vec::new();
-        let encoder = JpegEncoder::new_with_quality(&mut encoded, 100);
-        let result = encoder.write_image(&img, 65_536, 1, ColorType::L8);
-        match result {
-            Err(ImageError::Parameter(err)) => {
-                assert_eq!(err.kind(), DimensionMismatch)
-            }
-            other => {
-                assert!(
-                    false,
-                    "Encoding an image that is too large should return a DimensionError \
-                                it returned {:?} instead",
-                    other
-                )
-            }
-        }
-    }
-
-    #[test]
-    fn test_build_jfif_header() {
-        let mut buf = vec![];
-        let density = PixelDensity::dpi(100);
-        build_jfif_header(&mut buf, density);
-        assert_eq!(
-            buf,
-            [0x4A, 0x46, 0x49, 0x46, 0x00, 0x01, 0x02, 0x01, 0, 100, 0, 100, 0, 0]
-        );
-    }
-
-    #[test]
-    fn test_build_frame_header() {
-        let mut buf = vec![];
-        let components = vec![
-            Component {
-                id: 1,
-                h: 1,
-                v: 1,
-                tq: 5,
-                dc_table: 5,
-                ac_table: 5,
-                _dc_pred: 0,
-            },
-            Component {
-                id: 2,
-                h: 1,
-                v: 1,
-                tq: 4,
-                dc_table: 4,
-                ac_table: 4,
-                _dc_pred: 0,
-            },
-        ];
-        build_frame_header(&mut buf, 5, 100, 150, &components);
-        assert_eq!(
-            buf,
-            [5, 0, 150, 0, 100, 2, 1, 1 << 4 | 1, 5, 2, 1 << 4 | 1, 4]
-        );
-    }
-
-    #[test]
-    fn test_build_scan_header() {
-        let mut buf = vec![];
-        let components = vec![
-            Component {
-                id: 1,
-                h: 1,
-                v: 1,
-                tq: 5,
-                dc_table: 5,
-                ac_table: 5,
-                _dc_pred: 0,
-            },
-            Component {
-                id: 2,
-                h: 1,
-                v: 1,
-                tq: 4,
-                dc_table: 4,
-                ac_table: 4,
-                _dc_pred: 0,
-            },
-        ];
-        build_scan_header(&mut buf, &components);
-        assert_eq!(buf, [2, 1, 5 << 4 | 5, 2, 4 << 4 | 4, 0, 63, 0]);
-    }
-
-    #[test]
-    fn test_build_huffman_segment() {
-        let mut buf = vec![];
-        build_huffman_segment(
-            &mut buf,
-            DCCLASS,
-            LUMADESTINATION,
-            &STD_LUMA_DC_CODE_LENGTHS,
-            &STD_LUMA_DC_VALUES,
-        );
-        assert_eq!(
-            buf,
-            vec![
-                0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
-                10, 11
-            ]
-        );
-    }
-
-    #[test]
-    fn test_build_quantization_segment() {
-        let mut buf = vec![];
-        let qtable = [0u8; 64];
-        build_quantization_segment(&mut buf, 8, 1, &qtable);
-        let mut expected = vec![];
-        expected.push(0 << 4 | 1);
-        expected.extend_from_slice(&[0; 64]);
-        assert_eq!(buf, expected)
-    }
-
-    #[cfg(feature = "benchmarks")]
-    #[bench]
-    fn bench_jpeg_encoder_new(b: &mut Bencher) {
-        b.iter(|| {
-            let mut y = vec![];
-            let x = JpegEncoder::new(&mut y);
-        })
-    }
-}