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1 // Copyright 2010 Google Inc. | 1 // Copyright 2010 Google Inc. All Rights Reserved. |
2 // | 2 // |
3 // This code is licensed under the same terms as WebM: | 3 // This code is licensed under the same terms as WebM: |
4 // Software License Agreement: http://www.webmproject.org/license/software/ | 4 // Software License Agreement: http://www.webmproject.org/license/software/ |
5 // Additional IP Rights Grant: http://www.webmproject.org/license/additional/ | 5 // Additional IP Rights Grant: http://www.webmproject.org/license/additional/ |
6 // ----------------------------------------------------------------------------- | 6 // ----------------------------------------------------------------------------- |
7 // | 7 // |
8 // YUV->RGB conversion function | 8 // YUV->RGB conversion function |
9 // | 9 // |
10 // Author: Skal (pascal.massimino@gmail.com) | 10 // Author: Skal (pascal.massimino@gmail.com) |
11 | 11 |
12 #include "./yuv.h" | 12 #include "./yuv.h" |
13 | 13 |
14 #if defined(__cplusplus) || defined(c_plusplus) | 14 #if defined(__cplusplus) || defined(c_plusplus) |
15 extern "C" { | 15 extern "C" { |
16 #endif | 16 #endif |
17 | 17 |
18 enum { YUV_HALF = 1 << (YUV_FIX - 1) }; | 18 enum { YUV_HALF = 1 << (YUV_FIX - 1) }; |
19 | 19 |
20 int16_t VP8kVToR[256], VP8kUToB[256]; | 20 int16_t VP8kVToR[256], VP8kUToB[256]; |
21 int32_t VP8kVToG[256], VP8kUToG[256]; | 21 int32_t VP8kVToG[256], VP8kUToG[256]; |
22 uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN]; | 22 uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN]; |
23 uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN]; | 23 uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN]; |
24 | 24 |
25 static int done = 0; | 25 static int done = 0; |
26 | 26 |
27 static inline uint8_t clip(int v, int max_value) { | 27 static WEBP_INLINE uint8_t clip(int v, int max_value) { |
28 return v < 0 ? 0 : v > max_value ? max_value : v; | 28 return v < 0 ? 0 : v > max_value ? max_value : v; |
29 } | 29 } |
30 | 30 |
31 void VP8YUVInit(void) { | 31 void VP8YUVInit(void) { |
32 int i; | 32 int i; |
33 if (done) { | 33 if (done) { |
34 return; | 34 return; |
35 } | 35 } |
36 for (i = 0; i < 256; ++i) { | 36 for (i = 0; i < 256; ++i) { |
37 VP8kVToR[i] = (89858 * (i - 128) + YUV_HALF) >> YUV_FIX; | 37 VP8kVToR[i] = (89858 * (i - 128) + YUV_HALF) >> YUV_FIX; |
38 VP8kUToG[i] = -22014 * (i - 128) + YUV_HALF; | 38 VP8kUToG[i] = -22014 * (i - 128) + YUV_HALF; |
39 VP8kVToG[i] = -45773 * (i - 128); | 39 VP8kVToG[i] = -45773 * (i - 128); |
40 VP8kUToB[i] = (113618 * (i - 128) + YUV_HALF) >> YUV_FIX; | 40 VP8kUToB[i] = (113618 * (i - 128) + YUV_HALF) >> YUV_FIX; |
41 } | 41 } |
42 for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) { | 42 for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) { |
43 const int k = ((i - 16) * 76283 + YUV_HALF) >> YUV_FIX; | 43 const int k = ((i - 16) * 76283 + YUV_HALF) >> YUV_FIX; |
44 VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255); | 44 VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255); |
45 VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15); | 45 VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15); |
46 } | 46 } |
47 done = 1; | 47 done = 1; |
48 } | 48 } |
49 | 49 |
50 #if defined(__cplusplus) || defined(c_plusplus) | 50 #if defined(__cplusplus) || defined(c_plusplus) |
51 } // extern "C" | 51 } // extern "C" |
52 #endif | 52 #endif |
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