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