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libsharpyuv: add colorspace utilities

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Change-Id: I620c8593dc81f39e747de5ed354332adb7278bed
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Maryla
2022-04-06 15:38:21 +02:00
parent b8bca81fb6
commit 01a05de1a7
11 changed files with 185 additions and 22 deletions
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9
sharpyuv/sharpyuv.h
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@ -29,18 +29,15 @@ typedef struct {
int rgb_to_v[4];
} SharpYuvConversionMatrix;
// Returns the RGB to YUV matrix used by WebP.
const SharpYuvConversionMatrix* SharpYuvGetWebpMatrix(void);
// Converts RGB to YUV420 using a downsampling algorithm that minimizes
// artefacts caused by chroma subsampling.
// This is slower than standard downsampling (averaging of 4 UV values).
// Assumes that the image will be upsampled using a bilinear filter. If nearest
// neighbor is used instead, the upsampled image might look worse than with
// standard downsampling.
// TODO(maryla): add 10 bits and handling of various colorspaces. Add YUV444 to
// YUV420 conversion. Maybe also add 422 support (it's rarely used in practice,
// especially for images).
// TODO(maryla): add 10 bits support. Add YUV444 to YUV420 conversion.
// Maybe also add 422 support (it's rarely used in practice, especially for
// images).
int SharpYuvConvert(const uint8_t* r_ptr, const uint8_t* g_ptr,
const uint8_t* b_ptr, int step, int rgb_stride,
uint8_t* dst_y, int dst_stride_y, uint8_t* dst_u,