Crate image_webp

Expand description

Decoding and Encoding of WebP Images

Modules§

alpha_blending 🔒: Optimized alpha blending routines based on libwebp
decoder 🔒
encoder 🔒: Encoding of WebP images.
extended 🔒
huffman 🔒: Rudimentary utility for reading Canonical Huffman Codes. Based off https://github.com/webmproject/libwebp/blob/7f8472a610b61ec780ef0a8873cd954ac512a505/src/utils/huffman.c
loop_filter 🔒: Does loop filtering on webp lossy images
lossless 🔒: Decoding of lossless WebP images
lossless_transform 🔒
transform 🔒
vp8: An implementation of the VP8 Video Codec
vp8_arithmetic_decoder 🔒
yuv 🔒: Utilities for doing the YUV -> RGB conversion The images are encoded in the Y’CbCr format as detailed here: https://en.wikipedia.org/wiki/YCbCr so need to be converted to RGB to be displayed To do the YUV -> RGB conversion we need to first decide how to map the yuv values to the pixels The y buffer is the same size as the pixel buffer so that maps 1-1 but the u and v buffers are half the size of the pixel buffer so we need to scale it up The simple way to upscale is just to take each u/v value and associate it with the 4 pixels around it e.g. for a 4x4 image:

ColorType: Color type of the image.
DecodingError: Errors that can occur when attempting to decode a WebP image
EncodingError: Error that can occur during encoding.
LoopCount: Number of times that an animation loops.
UpsamplingMethod: Methods for upsampling the chroma values in lossy decoding