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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /media/libwebp/sharpyuv/sharpyuv_csp.c | |
parent | Initial commit. (diff) | |
download | thunderbird-upstream.tar.xz thunderbird-upstream.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'media/libwebp/sharpyuv/sharpyuv_csp.c')
-rw-r--r-- | media/libwebp/sharpyuv/sharpyuv_csp.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/media/libwebp/sharpyuv/sharpyuv_csp.c b/media/libwebp/sharpyuv/sharpyuv_csp.c new file mode 100644 index 0000000000..0ad22be945 --- /dev/null +++ b/media/libwebp/sharpyuv/sharpyuv_csp.c @@ -0,0 +1,110 @@ +// Copyright 2022 Google Inc. All Rights Reserved. +// +// Use of this source code is governed by a BSD-style license +// that can be found in the COPYING file in the root of the source +// tree. An additional intellectual property rights grant can be found +// in the file PATENTS. All contributing project authors may +// be found in the AUTHORS file in the root of the source tree. +// ----------------------------------------------------------------------------- +// +// Colorspace utilities. + +#include "sharpyuv/sharpyuv_csp.h" + +#include <assert.h> +#include <math.h> +#include <stddef.h> + +static int ToFixed16(float f) { return (int)floor(f * (1 << 16) + 0.5f); } + +void SharpYuvComputeConversionMatrix(const SharpYuvColorSpace* yuv_color_space, + SharpYuvConversionMatrix* matrix) { + const float kr = yuv_color_space->kr; + const float kb = yuv_color_space->kb; + const float kg = 1.0f - kr - kb; + const float cr = 0.5f / (1.0f - kb); + const float cb = 0.5f / (1.0f - kr); + + const int shift = yuv_color_space->bit_depth - 8; + + const float denom = (float)((1 << yuv_color_space->bit_depth) - 1); + float scale_y = 1.0f; + float add_y = 0.0f; + float scale_u = cr; + float scale_v = cb; + float add_uv = (float)(128 << shift); + assert(yuv_color_space->bit_depth >= 8); + + if (yuv_color_space->range == kSharpYuvRangeLimited) { + scale_y *= (219 << shift) / denom; + scale_u *= (224 << shift) / denom; + scale_v *= (224 << shift) / denom; + add_y = (float)(16 << shift); + } + + matrix->rgb_to_y[0] = ToFixed16(kr * scale_y); + matrix->rgb_to_y[1] = ToFixed16(kg * scale_y); + matrix->rgb_to_y[2] = ToFixed16(kb * scale_y); + matrix->rgb_to_y[3] = ToFixed16(add_y); + + matrix->rgb_to_u[0] = ToFixed16(-kr * scale_u); + matrix->rgb_to_u[1] = ToFixed16(-kg * scale_u); + matrix->rgb_to_u[2] = ToFixed16((1 - kb) * scale_u); + matrix->rgb_to_u[3] = ToFixed16(add_uv); + + matrix->rgb_to_v[0] = ToFixed16((1 - kr) * scale_v); + matrix->rgb_to_v[1] = ToFixed16(-kg * scale_v); + matrix->rgb_to_v[2] = ToFixed16(-kb * scale_v); + matrix->rgb_to_v[3] = ToFixed16(add_uv); +} + +// Matrices are in YUV_FIX fixed point precision. +// WebP's matrix, similar but not identical to kRec601LimitedMatrix. +static const SharpYuvConversionMatrix kWebpMatrix = { + {16839, 33059, 6420, 16 << 16}, + {-9719, -19081, 28800, 128 << 16}, + {28800, -24116, -4684, 128 << 16}, +}; +// Kr=0.2990f Kb=0.1140f bits=8 range=kSharpYuvRangeLimited +static const SharpYuvConversionMatrix kRec601LimitedMatrix = { + {16829, 33039, 6416, 16 << 16}, + {-9714, -19071, 28784, 128 << 16}, + {28784, -24103, -4681, 128 << 16}, +}; +// Kr=0.2990f Kb=0.1140f bits=8 range=kSharpYuvRangeFull +static const SharpYuvConversionMatrix kRec601FullMatrix = { + {19595, 38470, 7471, 0}, + {-11058, -21710, 32768, 128 << 16}, + {32768, -27439, -5329, 128 << 16}, +}; +// Kr=0.2126f Kb=0.0722f bits=8 range=kSharpYuvRangeLimited +static const SharpYuvConversionMatrix kRec709LimitedMatrix = { + {11966, 40254, 4064, 16 << 16}, + {-6596, -22189, 28784, 128 << 16}, + {28784, -26145, -2639, 128 << 16}, +}; +// Kr=0.2126f Kb=0.0722f bits=8 range=kSharpYuvRangeFull +static const SharpYuvConversionMatrix kRec709FullMatrix = { + {13933, 46871, 4732, 0}, + {-7509, -25259, 32768, 128 << 16}, + {32768, -29763, -3005, 128 << 16}, +}; + +const SharpYuvConversionMatrix* SharpYuvGetConversionMatrix( + SharpYuvMatrixType matrix_type) { + switch (matrix_type) { + case kSharpYuvMatrixWebp: + return &kWebpMatrix; + case kSharpYuvMatrixRec601Limited: + return &kRec601LimitedMatrix; + case kSharpYuvMatrixRec601Full: + return &kRec601FullMatrix; + case kSharpYuvMatrixRec709Limited: + return &kRec709LimitedMatrix; + case kSharpYuvMatrixRec709Full: + return &kRec709FullMatrix; + case kSharpYuvMatrixNum: + return NULL; + } + return NULL; +} |