mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-30 05:35:31 +00:00
90 lines
3.3 KiB
C++
90 lines
3.3 KiB
C++
// Copyright (c) 2009 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
// This webpage shows layout of YV12 and other YUV formats
|
|
// http://www.fourcc.org/yuv.php
|
|
// The actual conversion is best described here
|
|
// http://en.wikipedia.org/wiki/YUV
|
|
// An article on optimizing YUV conversion using tables instead of multiplies
|
|
// http://lestourtereaux.free.fr/papers/data/yuvrgb.pdf
|
|
//
|
|
// YV12 is a full plane of Y and a half height, half width chroma planes
|
|
// YV16 is a full plane of Y and a full height, half width chroma planes
|
|
// YV24 is a full plane of Y and a full height, full width chroma planes
|
|
//
|
|
// ARGB pixel format is output, which on little endian is stored as BGRA.
|
|
// The alpha is set to 255, allowing the application to use RGBA or RGB32.
|
|
|
|
#include "yuv_convert.h"
|
|
|
|
// Header for low level row functions.
|
|
#include "yuv_row.h"
|
|
#include "mozilla/SSE.h"
|
|
|
|
namespace mozilla {
|
|
|
|
namespace gfx {
|
|
|
|
// Convert a frame of YUV to 32 bit ARGB.
|
|
NS_GFX_(void) ConvertYCbCrToRGB32(const uint8* y_buf,
|
|
const uint8* u_buf,
|
|
const uint8* v_buf,
|
|
uint8* rgb_buf,
|
|
int pic_x,
|
|
int pic_y,
|
|
int pic_width,
|
|
int pic_height,
|
|
int y_pitch,
|
|
int uv_pitch,
|
|
int rgb_pitch,
|
|
YUVType yuv_type) {
|
|
unsigned int y_shift = yuv_type == YV12 ? 1 : 0;
|
|
unsigned int x_shift = yuv_type == YV24 ? 0 : 1;
|
|
// There is no optimized YV24 MMX routine so we check for this and
|
|
// fall back to the C code.
|
|
bool has_mmx = supports_mmx() && yuv_type != YV24;
|
|
bool odd_pic_x = yuv_type != YV24 && pic_x % 2 != 0;
|
|
int x_width = odd_pic_x ? pic_width - 1 : pic_width;
|
|
|
|
for (int y = pic_y; y < pic_height + pic_y; ++y) {
|
|
uint8* rgb_row = rgb_buf + (y - pic_y) * rgb_pitch;
|
|
const uint8* y_ptr = y_buf + y * y_pitch + pic_x;
|
|
const uint8* u_ptr = u_buf + (y >> y_shift) * uv_pitch + (pic_x >> x_shift);
|
|
const uint8* v_ptr = v_buf + (y >> y_shift) * uv_pitch + (pic_x >> x_shift);
|
|
|
|
if (odd_pic_x) {
|
|
// Handle the single odd pixel manually and use the
|
|
// fast routines for the remaining.
|
|
FastConvertYUVToRGB32Row_C(y_ptr++,
|
|
u_ptr++,
|
|
v_ptr++,
|
|
rgb_row,
|
|
1,
|
|
x_shift);
|
|
rgb_row += 4;
|
|
}
|
|
|
|
if (has_mmx)
|
|
FastConvertYUVToRGB32Row(y_ptr,
|
|
u_ptr,
|
|
v_ptr,
|
|
rgb_row,
|
|
x_width);
|
|
else
|
|
FastConvertYUVToRGB32Row_C(y_ptr,
|
|
u_ptr,
|
|
v_ptr,
|
|
rgb_row,
|
|
x_width,
|
|
x_shift);
|
|
}
|
|
|
|
// MMX used for FastConvertYUVToRGB32Row requires emms instruction.
|
|
if (has_mmx)
|
|
EMMS();
|
|
}
|
|
|
|
} // namespace gfx
|
|
} // namespace mozilla
|