1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/ycbcr/yuv_row_c.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,133 @@
1.4 +// Copyright (c) 2010 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include "yuv_row.h"
1.9 +
1.10 +#define DCHECK(a)
1.11 +
1.12 +extern "C" {
1.13 +
1.14 +// C reference code that mimic the YUV assembly.
1.15 +#define packuswb(x) ((x) < 0 ? 0 : ((x) > 255 ? 255 : (x)))
1.16 +#define paddsw(x, y) (((x) + (y)) < -32768 ? -32768 : \
1.17 + (((x) + (y)) > 32767 ? 32767 : ((x) + (y))))
1.18 +
1.19 +static inline void YuvPixel(uint8 y,
1.20 + uint8 u,
1.21 + uint8 v,
1.22 + uint8* rgb_buf) {
1.23 +
1.24 + int b = kCoefficientsRgbY[256+u][0];
1.25 + int g = kCoefficientsRgbY[256+u][1];
1.26 + int r = kCoefficientsRgbY[256+u][2];
1.27 + int a = kCoefficientsRgbY[256+u][3];
1.28 +
1.29 + b = paddsw(b, kCoefficientsRgbY[512+v][0]);
1.30 + g = paddsw(g, kCoefficientsRgbY[512+v][1]);
1.31 + r = paddsw(r, kCoefficientsRgbY[512+v][2]);
1.32 + a = paddsw(a, kCoefficientsRgbY[512+v][3]);
1.33 +
1.34 + b = paddsw(b, kCoefficientsRgbY[y][0]);
1.35 + g = paddsw(g, kCoefficientsRgbY[y][1]);
1.36 + r = paddsw(r, kCoefficientsRgbY[y][2]);
1.37 + a = paddsw(a, kCoefficientsRgbY[y][3]);
1.38 +
1.39 + b >>= 6;
1.40 + g >>= 6;
1.41 + r >>= 6;
1.42 + a >>= 6;
1.43 +
1.44 + *reinterpret_cast<uint32*>(rgb_buf) = (packuswb(b)) |
1.45 + (packuswb(g) << 8) |
1.46 + (packuswb(r) << 16) |
1.47 + (packuswb(a) << 24);
1.48 +}
1.49 +
1.50 +void FastConvertYUVToRGB32Row_C(const uint8* y_buf,
1.51 + const uint8* u_buf,
1.52 + const uint8* v_buf,
1.53 + uint8* rgb_buf,
1.54 + int width,
1.55 + unsigned int x_shift) {
1.56 + for (int x = 0; x < width; x += 2) {
1.57 + uint8 u = u_buf[x >> x_shift];
1.58 + uint8 v = v_buf[x >> x_shift];
1.59 + uint8 y0 = y_buf[x];
1.60 + YuvPixel(y0, u, v, rgb_buf);
1.61 + if ((x + 1) < width) {
1.62 + uint8 y1 = y_buf[x + 1];
1.63 + if (x_shift == 0) {
1.64 + u = u_buf[x + 1];
1.65 + v = v_buf[x + 1];
1.66 + }
1.67 + YuvPixel(y1, u, v, rgb_buf + 4);
1.68 + }
1.69 + rgb_buf += 8; // Advance 2 pixels.
1.70 + }
1.71 +}
1.72 +
1.73 +// 16.16 fixed point is used. A shift by 16 isolates the integer.
1.74 +// A shift by 17 is used to further subsample the chrominence channels.
1.75 +// & 0xffff isolates the fixed point fraction. >> 2 to get the upper 2 bits,
1.76 +// for 1/65536 pixel accurate interpolation.
1.77 +void ScaleYUVToRGB32Row_C(const uint8* y_buf,
1.78 + const uint8* u_buf,
1.79 + const uint8* v_buf,
1.80 + uint8* rgb_buf,
1.81 + int width,
1.82 + int source_dx) {
1.83 + int x = 0;
1.84 + for (int i = 0; i < width; i += 2) {
1.85 + int y = y_buf[x >> 16];
1.86 + int u = u_buf[(x >> 17)];
1.87 + int v = v_buf[(x >> 17)];
1.88 + YuvPixel(y, u, v, rgb_buf);
1.89 + x += source_dx;
1.90 + if ((i + 1) < width) {
1.91 + y = y_buf[x >> 16];
1.92 + YuvPixel(y, u, v, rgb_buf+4);
1.93 + x += source_dx;
1.94 + }
1.95 + rgb_buf += 8;
1.96 + }
1.97 +}
1.98 +
1.99 +void LinearScaleYUVToRGB32Row_C(const uint8* y_buf,
1.100 + const uint8* u_buf,
1.101 + const uint8* v_buf,
1.102 + uint8* rgb_buf,
1.103 + int width,
1.104 + int source_dx) {
1.105 + int x = 0;
1.106 + if (source_dx >= 0x20000) {
1.107 + x = 32768;
1.108 + }
1.109 + for (int i = 0; i < width; i += 2) {
1.110 + int y0 = y_buf[x >> 16];
1.111 + int y1 = y_buf[(x >> 16) + 1];
1.112 + int u0 = u_buf[(x >> 17)];
1.113 + int u1 = u_buf[(x >> 17) + 1];
1.114 + int v0 = v_buf[(x >> 17)];
1.115 + int v1 = v_buf[(x >> 17) + 1];
1.116 + int y_frac = (x & 65535);
1.117 + int uv_frac = ((x >> 1) & 65535);
1.118 + int y = (y_frac * y1 + (y_frac ^ 65535) * y0) >> 16;
1.119 + int u = (uv_frac * u1 + (uv_frac ^ 65535) * u0) >> 16;
1.120 + int v = (uv_frac * v1 + (uv_frac ^ 65535) * v0) >> 16;
1.121 + YuvPixel(y, u, v, rgb_buf);
1.122 + x += source_dx;
1.123 + if ((i + 1) < width) {
1.124 + y0 = y_buf[x >> 16];
1.125 + y1 = y_buf[(x >> 16) + 1];
1.126 + y_frac = (x & 65535);
1.127 + y = (y_frac * y1 + (y_frac ^ 65535) * y0) >> 16;
1.128 + YuvPixel(y, u, v, rgb_buf+4);
1.129 + x += source_dx;
1.130 + }
1.131 + rgb_buf += 8;
1.132 + }
1.133 +}
1.134 +
1.135 +} // extern "C"
1.136 +
