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134 lines
4.0 KiB
C++
134 lines
4.0 KiB
C++
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "yuv_row.h"
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#define DCHECK(a)
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extern "C" {
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// C reference code that mimic the YUV assembly.
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#define packuswb(x) ((x) < 0 ? 0 : ((x) > 255 ? 255 : (x)))
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#define paddsw(x, y) (((x) + (y)) < -32768 ? -32768 : \
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(((x) + (y)) > 32767 ? 32767 : ((x) + (y))))
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static inline void YuvPixel(uint8 y,
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uint8 u,
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uint8 v,
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uint8* rgb_buf) {
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int b = kCoefficientsRgbY[256+u][0];
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int g = kCoefficientsRgbY[256+u][1];
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int r = kCoefficientsRgbY[256+u][2];
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int a = kCoefficientsRgbY[256+u][3];
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b = paddsw(b, kCoefficientsRgbY[512+v][0]);
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g = paddsw(g, kCoefficientsRgbY[512+v][1]);
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r = paddsw(r, kCoefficientsRgbY[512+v][2]);
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a = paddsw(a, kCoefficientsRgbY[512+v][3]);
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b = paddsw(b, kCoefficientsRgbY[y][0]);
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g = paddsw(g, kCoefficientsRgbY[y][1]);
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r = paddsw(r, kCoefficientsRgbY[y][2]);
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a = paddsw(a, kCoefficientsRgbY[y][3]);
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b >>= 6;
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g >>= 6;
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r >>= 6;
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a >>= 6;
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*reinterpret_cast<uint32*>(rgb_buf) = (packuswb(b)) |
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(packuswb(g) << 8) |
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(packuswb(r) << 16) |
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(packuswb(a) << 24);
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}
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void FastConvertYUVToRGB32Row_C(const uint8* y_buf,
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const uint8* u_buf,
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const uint8* v_buf,
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uint8* rgb_buf,
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int width,
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unsigned int x_shift) {
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for (int x = 0; x < width; x += 2) {
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uint8 u = u_buf[x >> x_shift];
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uint8 v = v_buf[x >> x_shift];
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uint8 y0 = y_buf[x];
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YuvPixel(y0, u, v, rgb_buf);
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if ((x + 1) < width) {
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uint8 y1 = y_buf[x + 1];
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if (x_shift == 0) {
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u = u_buf[x + 1];
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v = v_buf[x + 1];
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}
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YuvPixel(y1, u, v, rgb_buf + 4);
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}
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rgb_buf += 8; // Advance 2 pixels.
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}
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}
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// 16.16 fixed point is used. A shift by 16 isolates the integer.
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// A shift by 17 is used to further subsample the chrominence channels.
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// & 0xffff isolates the fixed point fraction. >> 2 to get the upper 2 bits,
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// for 1/65536 pixel accurate interpolation.
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void ScaleYUVToRGB32Row_C(const uint8* y_buf,
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const uint8* u_buf,
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const uint8* v_buf,
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uint8* rgb_buf,
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int width,
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int source_dx) {
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int x = 0;
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for (int i = 0; i < width; i += 2) {
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int y = y_buf[x >> 16];
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int u = u_buf[(x >> 17)];
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int v = v_buf[(x >> 17)];
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YuvPixel(y, u, v, rgb_buf);
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x += source_dx;
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if ((i + 1) < width) {
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y = y_buf[x >> 16];
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YuvPixel(y, u, v, rgb_buf+4);
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x += source_dx;
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}
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rgb_buf += 8;
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}
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}
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void LinearScaleYUVToRGB32Row_C(const uint8* y_buf,
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const uint8* u_buf,
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const uint8* v_buf,
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uint8* rgb_buf,
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int width,
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int source_dx) {
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int x = 0;
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if (source_dx >= 0x20000) {
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x = 32768;
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}
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for (int i = 0; i < width; i += 2) {
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int y0 = y_buf[x >> 16];
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int y1 = y_buf[(x >> 16) + 1];
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int u0 = u_buf[(x >> 17)];
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int u1 = u_buf[(x >> 17) + 1];
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int v0 = v_buf[(x >> 17)];
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int v1 = v_buf[(x >> 17) + 1];
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int y_frac = (x & 65535);
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int uv_frac = ((x >> 1) & 65535);
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int y = (y_frac * y1 + (y_frac ^ 65535) * y0) >> 16;
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int u = (uv_frac * u1 + (uv_frac ^ 65535) * u0) >> 16;
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int v = (uv_frac * v1 + (uv_frac ^ 65535) * v0) >> 16;
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YuvPixel(y, u, v, rgb_buf);
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x += source_dx;
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if ((i + 1) < width) {
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y0 = y_buf[x >> 16];
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y1 = y_buf[(x >> 16) + 1];
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y_frac = (x & 65535);
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y = (y_frac * y1 + (y_frac ^ 65535) * y0) >> 16;
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YuvPixel(y, u, v, rgb_buf+4);
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x += source_dx;
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}
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rgb_buf += 8;
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}
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}
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} // extern "C"
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