Mercurial > repos > rliterman > csp2
comparison CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/include/webp/sharpyuv/sharpyuv_csp.h @ 69:33d812a61356
planemo upload commit 2e9511a184a1ca667c7be0c6321a36dc4e3d116d
| author | jpayne |
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| date | Tue, 18 Mar 2025 17:55:14 -0400 |
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| 67:0e9998148a16 | 69:33d812a61356 |
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| 1 // Copyright 2022 Google Inc. All Rights Reserved. | |
| 2 // | |
| 3 // Use of this source code is governed by a BSD-style license | |
| 4 // that can be found in the COPYING file in the root of the source | |
| 5 // tree. An additional intellectual property rights grant can be found | |
| 6 // in the file PATENTS. All contributing project authors may | |
| 7 // be found in the AUTHORS file in the root of the source tree. | |
| 8 // ----------------------------------------------------------------------------- | |
| 9 // | |
| 10 // Colorspace utilities. | |
| 11 | |
| 12 #ifndef WEBP_SHARPYUV_SHARPYUV_CSP_H_ | |
| 13 #define WEBP_SHARPYUV_SHARPYUV_CSP_H_ | |
| 14 | |
| 15 #include "sharpyuv/sharpyuv.h" | |
| 16 | |
| 17 #ifdef __cplusplus | |
| 18 extern "C" { | |
| 19 #endif | |
| 20 | |
| 21 // Range of YUV values. | |
| 22 typedef enum { | |
| 23 kSharpYuvRangeFull, // YUV values between [0;255] (for 8 bit) | |
| 24 kSharpYuvRangeLimited // Y in [16;235], YUV in [16;240] (for 8 bit) | |
| 25 } SharpYuvRange; | |
| 26 | |
| 27 // Constants that define a YUV color space. | |
| 28 typedef struct { | |
| 29 // Kr and Kb are defined such that: | |
| 30 // Y = Kr * r + Kg * g + Kb * b where Kg = 1 - Kr - Kb. | |
| 31 float kr; | |
| 32 float kb; | |
| 33 int bit_depth; // 8, 10 or 12 | |
| 34 SharpYuvRange range; | |
| 35 } SharpYuvColorSpace; | |
| 36 | |
| 37 // Fills in 'matrix' for the given YUVColorSpace. | |
| 38 SHARPYUV_EXTERN void SharpYuvComputeConversionMatrix( | |
| 39 const SharpYuvColorSpace* yuv_color_space, | |
| 40 SharpYuvConversionMatrix* matrix); | |
| 41 | |
| 42 // Enums for precomputed conversion matrices. | |
| 43 typedef enum { | |
| 44 // WebP's matrix, similar but not identical to kSharpYuvMatrixRec601Limited | |
| 45 kSharpYuvMatrixWebp = 0, | |
| 46 // Kr=0.2990f Kb=0.1140f bit_depth=8 range=kSharpYuvRangeLimited | |
| 47 kSharpYuvMatrixRec601Limited, | |
| 48 // Kr=0.2990f Kb=0.1140f bit_depth=8 range=kSharpYuvRangeFull | |
| 49 kSharpYuvMatrixRec601Full, | |
| 50 // Kr=0.2126f Kb=0.0722f bit_depth=8 range=kSharpYuvRangeLimited | |
| 51 kSharpYuvMatrixRec709Limited, | |
| 52 // Kr=0.2126f Kb=0.0722f bit_depth=8 range=kSharpYuvRangeFull | |
| 53 kSharpYuvMatrixRec709Full, | |
| 54 kSharpYuvMatrixNum | |
| 55 } SharpYuvMatrixType; | |
| 56 | |
| 57 // Returns a pointer to a matrix for one of the predefined colorspaces. | |
| 58 SHARPYUV_EXTERN const SharpYuvConversionMatrix* SharpYuvGetConversionMatrix( | |
| 59 SharpYuvMatrixType matrix_type); | |
| 60 | |
| 61 #ifdef __cplusplus | |
| 62 } // extern "C" | |
| 63 #endif | |
| 64 | |
| 65 #endif // WEBP_SHARPYUV_SHARPYUV_CSP_H_ |