b4c4ce9e17
* adds third_party/libwebp and cmake option to enable building it. * disable simd and default disable pthreads for webgl builds. * ensure non-empty config var value * Added notes on libwebp change to NEW_RELEASE_NOTES.md * Update NEW_RELEASE_NOTES.md
28 lines
1.2 KiB
C
28 lines
1.2 KiB
C
// Copyright 2023 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Precomputed data for 420 risk estimation.
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#ifndef WEBP_EXTRAS_SHARPYUV_RISK_TABLE_H_
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#define WEBP_EXTRAS_SHARPYUV_RISK_TABLE_H_
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#include "src/webp/types.h"
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extern const int kSharpYuvPrecomputedRiskYuvSampling;
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// Table of precomputed risk scores when chroma subsampling images with two
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// given colors.
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// Since precomputing values for all possible YUV colors would create a huge
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// table, the YUV space (i.e. [0, 255]^3) is reduced to
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// [0, kSharpYuvPrecomputedRiskYuvSampling-1]^3
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// where 255 maps to kSharpYuvPrecomputedRiskYuvSampling-1.
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// Table size: kSharpYuvPrecomputedRiskYuvSampling^6 bytes or 114 KiB
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extern const uint8_t kSharpYuvPrecomputedRisk[];
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#endif // WEBP_EXTRAS_SHARPYUV_RISK_TABLE_H_
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