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358 lines
13 KiB
C++
358 lines
13 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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// This webpage shows layout of YV12 and other YUV formats
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// http://www.fourcc.org/yuv.php
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// The actual conversion is best described here
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// http://en.wikipedia.org/wiki/YUV
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// An article on optimizing YUV conversion using tables instead of multiplies
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// http://lestourtereaux.free.fr/papers/data/yuvrgb.pdf
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//
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// YV12 is a full plane of Y and a half height, half width chroma planes
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// YV16 is a full plane of Y and a full height, half width chroma planes
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// YV24 is a full plane of Y and a full height, full width chroma planes
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//
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// ARGB pixel format is output, which on little endian is stored as BGRA.
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// The alpha is set to 255, allowing the application to use RGBA or RGB32.
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#include "yuv_convert.h"
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// Header for low level row functions.
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#include "yuv_row.h"
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#include "mozilla/SSE.h"
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namespace mozilla {
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namespace gfx {
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// 16.16 fixed point arithmetic
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const int kFractionBits = 16;
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const int kFractionMax = 1 << kFractionBits;
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const int kFractionMask = ((1 << kFractionBits) - 1);
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NS_GFX_(YUVType) TypeFromSize(int ywidth,
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int yheight,
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int cbcrwidth,
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int cbcrheight)
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{
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if (ywidth == cbcrwidth && yheight == cbcrheight) {
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return YV24;
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}
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else if (ywidth / 2 == cbcrwidth && yheight == cbcrheight) {
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return YV16;
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}
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else {
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return YV12;
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}
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}
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// Convert a frame of YUV to 32 bit ARGB.
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NS_GFX_(void) ConvertYCbCrToRGB32(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 pic_x,
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int pic_y,
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int pic_width,
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int pic_height,
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int y_pitch,
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int uv_pitch,
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int rgb_pitch,
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YUVType yuv_type) {
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unsigned int y_shift = yuv_type == YV12 ? 1 : 0;
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unsigned int x_shift = yuv_type == YV24 ? 0 : 1;
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// Test for SSE because the optimized code uses movntq, which is not part of MMX.
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bool has_sse = supports_mmx() && supports_sse();
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// There is no optimized YV24 SSE routine so we check for this and
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// fall back to the C code.
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has_sse &= yuv_type != YV24;
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bool odd_pic_x = yuv_type != YV24 && pic_x % 2 != 0;
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int x_width = odd_pic_x ? pic_width - 1 : pic_width;
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for (int y = pic_y; y < pic_height + pic_y; ++y) {
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uint8* rgb_row = rgb_buf + (y - pic_y) * rgb_pitch;
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const uint8* y_ptr = y_buf + y * y_pitch + pic_x;
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const uint8* u_ptr = u_buf + (y >> y_shift) * uv_pitch + (pic_x >> x_shift);
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const uint8* v_ptr = v_buf + (y >> y_shift) * uv_pitch + (pic_x >> x_shift);
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if (odd_pic_x) {
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// Handle the single odd pixel manually and use the
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// fast routines for the remaining.
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FastConvertYUVToRGB32Row_C(y_ptr++,
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u_ptr++,
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v_ptr++,
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rgb_row,
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1,
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x_shift);
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rgb_row += 4;
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}
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if (has_sse) {
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FastConvertYUVToRGB32Row(y_ptr,
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u_ptr,
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v_ptr,
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rgb_row,
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x_width);
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}
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else {
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FastConvertYUVToRGB32Row_C(y_ptr,
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u_ptr,
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v_ptr,
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rgb_row,
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x_width,
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x_shift);
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}
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}
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// MMX used for FastConvertYUVToRGB32Row requires emms instruction.
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if (has_sse)
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EMMS();
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}
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// C version does 8 at a time to mimic MMX code
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static void FilterRows_C(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
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int source_width, int source_y_fraction) {
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int y1_fraction = source_y_fraction;
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int y0_fraction = 256 - y1_fraction;
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uint8* end = ybuf + source_width;
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do {
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ybuf[0] = (y0_ptr[0] * y0_fraction + y1_ptr[0] * y1_fraction) >> 8;
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ybuf[1] = (y0_ptr[1] * y0_fraction + y1_ptr[1] * y1_fraction) >> 8;
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ybuf[2] = (y0_ptr[2] * y0_fraction + y1_ptr[2] * y1_fraction) >> 8;
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ybuf[3] = (y0_ptr[3] * y0_fraction + y1_ptr[3] * y1_fraction) >> 8;
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ybuf[4] = (y0_ptr[4] * y0_fraction + y1_ptr[4] * y1_fraction) >> 8;
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ybuf[5] = (y0_ptr[5] * y0_fraction + y1_ptr[5] * y1_fraction) >> 8;
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ybuf[6] = (y0_ptr[6] * y0_fraction + y1_ptr[6] * y1_fraction) >> 8;
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ybuf[7] = (y0_ptr[7] * y0_fraction + y1_ptr[7] * y1_fraction) >> 8;
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y0_ptr += 8;
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y1_ptr += 8;
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ybuf += 8;
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} while (ybuf < end);
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}
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#ifdef MOZILLA_MAY_SUPPORT_MMX
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void FilterRows_MMX(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
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int source_width, int source_y_fraction);
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#endif
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#ifdef MOZILLA_MAY_SUPPORT_SSE2
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void FilterRows_SSE2(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
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int source_width, int source_y_fraction);
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#endif
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static inline void FilterRows(uint8* ybuf, const uint8* y0_ptr,
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const uint8* y1_ptr, int source_width,
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int source_y_fraction) {
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#ifdef MOZILLA_MAY_SUPPORT_SSE2
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if (mozilla::supports_sse2()) {
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FilterRows_SSE2(ybuf, y0_ptr, y1_ptr, source_width, source_y_fraction);
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return;
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}
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#endif
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#ifdef MOZILLA_MAY_SUPPORT_MMX
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if (mozilla::supports_mmx()) {
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FilterRows_MMX(ybuf, y0_ptr, y1_ptr, source_width, source_y_fraction);
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return;
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}
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#endif
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FilterRows_C(ybuf, y0_ptr, y1_ptr, source_width, source_y_fraction);
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}
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// Scale a frame of YUV to 32 bit ARGB.
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NS_GFX_(void) ScaleYCbCrToRGB32(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 source_width,
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int source_height,
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int width,
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int height,
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int y_pitch,
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int uv_pitch,
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int rgb_pitch,
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YUVType yuv_type,
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Rotate view_rotate,
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ScaleFilter filter) {
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bool has_mmx = supports_mmx();
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// 4096 allows 3 buffers to fit in 12k.
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// Helps performance on CPU with 16K L1 cache.
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// Large enough for 3830x2160 and 30" displays which are 2560x1600.
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const int kFilterBufferSize = 4096;
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// Disable filtering if the screen is too big (to avoid buffer overflows).
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// This should never happen to regular users: they don't have monitors
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// wider than 4096 pixels.
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// TODO(fbarchard): Allow rotated videos to filter.
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if (source_width > kFilterBufferSize || view_rotate)
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filter = FILTER_NONE;
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unsigned int y_shift = yuv_type == YV12 ? 1 : 0;
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// Diagram showing origin and direction of source sampling.
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// ->0 4<-
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// 7 3
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//
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// 6 5
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// ->1 2<-
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// Rotations that start at right side of image.
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if ((view_rotate == ROTATE_180) ||
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(view_rotate == ROTATE_270) ||
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(view_rotate == MIRROR_ROTATE_0) ||
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(view_rotate == MIRROR_ROTATE_90)) {
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y_buf += source_width - 1;
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u_buf += source_width / 2 - 1;
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v_buf += source_width / 2 - 1;
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source_width = -source_width;
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}
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// Rotations that start at bottom of image.
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if ((view_rotate == ROTATE_90) ||
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(view_rotate == ROTATE_180) ||
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(view_rotate == MIRROR_ROTATE_90) ||
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(view_rotate == MIRROR_ROTATE_180)) {
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y_buf += (source_height - 1) * y_pitch;
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u_buf += ((source_height >> y_shift) - 1) * uv_pitch;
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v_buf += ((source_height >> y_shift) - 1) * uv_pitch;
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source_height = -source_height;
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}
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// Handle zero sized destination.
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if (width == 0 || height == 0)
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return;
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int source_dx = source_width * kFractionMax / width;
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int source_dy = source_height * kFractionMax / height;
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int source_dx_uv = source_dx;
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if ((view_rotate == ROTATE_90) ||
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(view_rotate == ROTATE_270)) {
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int tmp = height;
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height = width;
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width = tmp;
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tmp = source_height;
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source_height = source_width;
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source_width = tmp;
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int original_dx = source_dx;
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int original_dy = source_dy;
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source_dx = ((original_dy >> kFractionBits) * y_pitch) << kFractionBits;
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source_dx_uv = ((original_dy >> kFractionBits) * uv_pitch) << kFractionBits;
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source_dy = original_dx;
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if (view_rotate == ROTATE_90) {
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y_pitch = -1;
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uv_pitch = -1;
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source_height = -source_height;
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} else {
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y_pitch = 1;
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uv_pitch = 1;
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}
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}
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// Need padding because FilterRows() will write 1 to 16 extra pixels
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// after the end for SSE2 version.
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uint8 yuvbuf[16 + kFilterBufferSize * 3 + 16];
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uint8* ybuf =
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reinterpret_cast<uint8*>(reinterpret_cast<PRUptrdiff>(yuvbuf + 15) & ~15);
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uint8* ubuf = ybuf + kFilterBufferSize;
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uint8* vbuf = ubuf + kFilterBufferSize;
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// TODO(fbarchard): Fixed point math is off by 1 on negatives.
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int yscale_fixed = (source_height << kFractionBits) / height;
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// TODO(fbarchard): Split this into separate function for better efficiency.
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for (int y = 0; y < height; ++y) {
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uint8* dest_pixel = rgb_buf + y * rgb_pitch;
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int source_y_subpixel = (y * yscale_fixed);
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if (yscale_fixed >= (kFractionMax * 2)) {
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source_y_subpixel += kFractionMax / 2; // For 1/2 or less, center filter.
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}
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int source_y = source_y_subpixel >> kFractionBits;
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const uint8* y0_ptr = y_buf + source_y * y_pitch;
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const uint8* y1_ptr = y0_ptr + y_pitch;
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const uint8* u0_ptr = u_buf + (source_y >> y_shift) * uv_pitch;
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const uint8* u1_ptr = u0_ptr + uv_pitch;
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const uint8* v0_ptr = v_buf + (source_y >> y_shift) * uv_pitch;
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const uint8* v1_ptr = v0_ptr + uv_pitch;
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// vertical scaler uses 16.8 fixed point
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int source_y_fraction = (source_y_subpixel & kFractionMask) >> 8;
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int source_uv_fraction =
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((source_y_subpixel >> y_shift) & kFractionMask) >> 8;
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const uint8* y_ptr = y0_ptr;
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const uint8* u_ptr = u0_ptr;
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const uint8* v_ptr = v0_ptr;
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// Apply vertical filtering if necessary.
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// TODO(fbarchard): Remove memcpy when not necessary.
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if (filter & mozilla::gfx::FILTER_BILINEAR_V) {
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if (yscale_fixed != kFractionMax &&
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source_y_fraction && ((source_y + 1) < source_height)) {
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FilterRows(ybuf, y0_ptr, y1_ptr, source_width, source_y_fraction);
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} else {
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memcpy(ybuf, y0_ptr, source_width);
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}
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y_ptr = ybuf;
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ybuf[source_width] = ybuf[source_width-1];
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int uv_source_width = (source_width + 1) / 2;
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if (yscale_fixed != kFractionMax &&
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source_uv_fraction &&
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(((source_y >> y_shift) + 1) < (source_height >> y_shift))) {
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FilterRows(ubuf, u0_ptr, u1_ptr, uv_source_width, source_uv_fraction);
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FilterRows(vbuf, v0_ptr, v1_ptr, uv_source_width, source_uv_fraction);
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} else {
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memcpy(ubuf, u0_ptr, uv_source_width);
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memcpy(vbuf, v0_ptr, uv_source_width);
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}
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u_ptr = ubuf;
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v_ptr = vbuf;
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ubuf[uv_source_width] = ubuf[uv_source_width - 1];
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vbuf[uv_source_width] = vbuf[uv_source_width - 1];
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}
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if (source_dx == kFractionMax) { // Not scaled
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FastConvertYUVToRGB32Row(y_ptr, u_ptr, v_ptr,
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dest_pixel, width);
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} else if (filter & FILTER_BILINEAR_H) {
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LinearScaleYUVToRGB32Row(y_ptr, u_ptr, v_ptr,
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dest_pixel, width, source_dx);
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} else {
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// Specialized scalers and rotation.
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#if defined(MOZILLA_MAY_SUPPORT_SSE) && defined(_MSC_VER) && defined(_M_IX86)
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if(mozilla::supports_sse()) {
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if (width == (source_width * 2)) {
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DoubleYUVToRGB32Row_SSE(y_ptr, u_ptr, v_ptr,
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dest_pixel, width);
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} else if ((source_dx & kFractionMask) == 0) {
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// Scaling by integer scale factor. ie half.
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ConvertYUVToRGB32Row_SSE(y_ptr, u_ptr, v_ptr,
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dest_pixel, width,
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source_dx >> kFractionBits);
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} else if (source_dx_uv == source_dx) { // Not rotated.
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ScaleYUVToRGB32Row(y_ptr, u_ptr, v_ptr,
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dest_pixel, width, source_dx);
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} else {
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RotateConvertYUVToRGB32Row_SSE(y_ptr, u_ptr, v_ptr,
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dest_pixel, width,
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source_dx >> kFractionBits,
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source_dx_uv >> kFractionBits);
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}
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}
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else {
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ScaleYUVToRGB32Row_C(y_ptr, u_ptr, v_ptr,
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dest_pixel, width, source_dx);
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}
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#else
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(void)source_dx_uv;
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ScaleYUVToRGB32Row(y_ptr, u_ptr, v_ptr,
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dest_pixel, width, source_dx);
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#endif
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}
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}
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// MMX used for FastConvertYUVToRGB32Row and FilterRows requires emms.
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if (has_mmx)
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EMMS();
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}
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} // namespace gfx
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} // namespace mozilla
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