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comparison: gfx/ycbcr/yuv_row_c.cpp
gfx/ycbcr/yuv_row_c.cpp
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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "yuv_row.h" | |
| 6 | |
| 7 #define DCHECK(a) | |
| 8 | |
| 9 extern "C" { | |
| 10 | |
| 11 // C reference code that mimic the YUV assembly. | |
| 12 #define packuswb(x) ((x) < 0 ? 0 : ((x) > 255 ? 255 : (x))) | |
| 13 #define paddsw(x, y) (((x) + (y)) < -32768 ? -32768 : \ | |
| 14 (((x) + (y)) > 32767 ? 32767 : ((x) + (y)))) | |
| 15 | |
| 16 static inline void YuvPixel(uint8 y, | |
| 17 uint8 u, | |
| 18 uint8 v, | |
| 19 uint8* rgb_buf) { | |
| 20 | |
| 21 int b = kCoefficientsRgbY[256+u][0]; | |
| 22 int g = kCoefficientsRgbY[256+u][1]; | |
| 23 int r = kCoefficientsRgbY[256+u][2]; | |
| 24 int a = kCoefficientsRgbY[256+u][3]; | |
| 25 | |
| 26 b = paddsw(b, kCoefficientsRgbY[512+v][0]); | |
| 27 g = paddsw(g, kCoefficientsRgbY[512+v][1]); | |
| 28 r = paddsw(r, kCoefficientsRgbY[512+v][2]); | |
| 29 a = paddsw(a, kCoefficientsRgbY[512+v][3]); | |
| 30 | |
| 31 b = paddsw(b, kCoefficientsRgbY[y][0]); | |
| 32 g = paddsw(g, kCoefficientsRgbY[y][1]); | |
| 33 r = paddsw(r, kCoefficientsRgbY[y][2]); | |
| 34 a = paddsw(a, kCoefficientsRgbY[y][3]); | |
| 35 | |
| 36 b >>= 6; | |
| 37 g >>= 6; | |
| 38 r >>= 6; | |
| 39 a >>= 6; | |
| 40 | |
| 41 *reinterpret_cast<uint32*>(rgb_buf) = (packuswb(b)) | | |
| 42 (packuswb(g) << 8) | | |
| 43 (packuswb(r) << 16) | | |
| 44 (packuswb(a) << 24); | |
| 45 } | |
| 46 | |
| 47 void FastConvertYUVToRGB32Row_C(const uint8* y_buf, | |
| 48 const uint8* u_buf, | |
| 49 const uint8* v_buf, | |
| 50 uint8* rgb_buf, | |
| 51 int width, | |
| 52 unsigned int x_shift) { | |
| 53 for (int x = 0; x < width; x += 2) { | |
| 54 uint8 u = u_buf[x >> x_shift]; | |
| 55 uint8 v = v_buf[x >> x_shift]; | |
| 56 uint8 y0 = y_buf[x]; | |
| 57 YuvPixel(y0, u, v, rgb_buf); | |
| 58 if ((x + 1) < width) { | |
| 59 uint8 y1 = y_buf[x + 1]; | |
| 60 if (x_shift == 0) { | |
| 61 u = u_buf[x + 1]; | |
| 62 v = v_buf[x + 1]; | |
| 63 } | |
| 64 YuvPixel(y1, u, v, rgb_buf + 4); | |
| 65 } | |
| 66 rgb_buf += 8; // Advance 2 pixels. | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 // 16.16 fixed point is used. A shift by 16 isolates the integer. | |
| 71 // A shift by 17 is used to further subsample the chrominence channels. | |
| 72 // & 0xffff isolates the fixed point fraction. >> 2 to get the upper 2 bits, | |
| 73 // for 1/65536 pixel accurate interpolation. | |
| 74 void ScaleYUVToRGB32Row_C(const uint8* y_buf, | |
| 75 const uint8* u_buf, | |
| 76 const uint8* v_buf, | |
| 77 uint8* rgb_buf, | |
| 78 int width, | |
| 79 int source_dx) { | |
| 80 int x = 0; | |
| 81 for (int i = 0; i < width; i += 2) { | |
| 82 int y = y_buf[x >> 16]; | |
| 83 int u = u_buf[(x >> 17)]; | |
| 84 int v = v_buf[(x >> 17)]; | |
| 85 YuvPixel(y, u, v, rgb_buf); | |
| 86 x += source_dx; | |
| 87 if ((i + 1) < width) { | |
| 88 y = y_buf[x >> 16]; | |
| 89 YuvPixel(y, u, v, rgb_buf+4); | |
| 90 x += source_dx; | |
| 91 } | |
| 92 rgb_buf += 8; | |
| 93 } | |
| 94 } | |
| 95 | |
| 96 void LinearScaleYUVToRGB32Row_C(const uint8* y_buf, | |
| 97 const uint8* u_buf, | |
| 98 const uint8* v_buf, | |
| 99 uint8* rgb_buf, | |
| 100 int width, | |
| 101 int source_dx) { | |
| 102 int x = 0; | |
| 103 if (source_dx >= 0x20000) { | |
| 104 x = 32768; | |
| 105 } | |
| 106 for (int i = 0; i < width; i += 2) { | |
| 107 int y0 = y_buf[x >> 16]; | |
| 108 int y1 = y_buf[(x >> 16) + 1]; | |
| 109 int u0 = u_buf[(x >> 17)]; | |
| 110 int u1 = u_buf[(x >> 17) + 1]; | |
| 111 int v0 = v_buf[(x >> 17)]; | |
| 112 int v1 = v_buf[(x >> 17) + 1]; | |
| 113 int y_frac = (x & 65535); | |
| 114 int uv_frac = ((x >> 1) & 65535); | |
| 115 int y = (y_frac * y1 + (y_frac ^ 65535) * y0) >> 16; | |
| 116 int u = (uv_frac * u1 + (uv_frac ^ 65535) * u0) >> 16; | |
| 117 int v = (uv_frac * v1 + (uv_frac ^ 65535) * v0) >> 16; | |
| 118 YuvPixel(y, u, v, rgb_buf); | |
| 119 x += source_dx; | |
| 120 if ((i + 1) < width) { | |
| 121 y0 = y_buf[x >> 16]; | |
| 122 y1 = y_buf[(x >> 16) + 1]; | |
| 123 y_frac = (x & 65535); | |
| 124 y = (y_frac * y1 + (y_frac ^ 65535) * y0) >> 16; | |
| 125 YuvPixel(y, u, v, rgb_buf+4); | |
| 126 x += source_dx; | |
| 127 } | |
| 128 rgb_buf += 8; | |
| 129 } | |
| 130 } | |
| 131 | |
| 132 } // extern "C" | |
| 133 |
