gfx/ycbcr/yuv_convert.cpp
 author ffxbld Mon, 05 Sep 2016 07:58:46 -0700 changeset 327851 5d1f8216843a6374f3bd2bd74ab2532da67d74ee parent 325833 f5804d79ba15e4e16aaa004cd37331a4b2233a9f child 328066 c88f2cb8e4fae6764f559c0e43a93edd518102d2 permissions -rw-r--r--
No bug - Tagging 77a60bbacb97c2f36815b2c395958a354aa581c9 with FIREFOX_49_0b10_BUILD1, FIREFOX_49_0b10_RELEASE a=release CLOSED TREE
```
// 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 {

// 16.16 fixed point arithmetic
const int kFractionBits = 16;
const int kFractionMax = 1 << kFractionBits;
const int kFractionMask = ((1 << kFractionBits) - 1);

YUVType TypeFromSize(int ywidth,
int yheight,
int cbcrwidth,
int cbcrheight)
{
if (ywidth == cbcrwidth && yheight == cbcrheight) {
return YV24;
}
else if ((ywidth + 1) / 2 == cbcrwidth && yheight == cbcrheight) {
return YV16;
}
else {
return YV12;
}
}

// Convert a frame of YUV to 32 bit ARGB.
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;
// Test for SSE because the optimized code uses movntq, which is not part of MMX.
bool has_sse = supports_mmx() && supports_sse();
// There is no optimized YV24 SSE routine so we check for this and
// fall back to the C code.
has_sse &= 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_sse) {
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_sse)
EMMS();
}

// C version does 8 at a time to mimic MMX code
static void FilterRows_C(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
int source_width, int source_y_fraction) {
int y1_fraction = source_y_fraction;
int y0_fraction = 256 - y1_fraction;
uint8* end = ybuf + source_width;
do {
ybuf[0] = (y0_ptr[0] * y0_fraction + y1_ptr[0] * y1_fraction) >> 8;
ybuf[1] = (y0_ptr[1] * y0_fraction + y1_ptr[1] * y1_fraction) >> 8;
ybuf[2] = (y0_ptr[2] * y0_fraction + y1_ptr[2] * y1_fraction) >> 8;
ybuf[3] = (y0_ptr[3] * y0_fraction + y1_ptr[3] * y1_fraction) >> 8;
ybuf[4] = (y0_ptr[4] * y0_fraction + y1_ptr[4] * y1_fraction) >> 8;
ybuf[5] = (y0_ptr[5] * y0_fraction + y1_ptr[5] * y1_fraction) >> 8;
ybuf[6] = (y0_ptr[6] * y0_fraction + y1_ptr[6] * y1_fraction) >> 8;
ybuf[7] = (y0_ptr[7] * y0_fraction + y1_ptr[7] * y1_fraction) >> 8;
y0_ptr += 8;
y1_ptr += 8;
ybuf += 8;
} while (ybuf < end);
}

#ifdef MOZILLA_MAY_SUPPORT_MMX
void FilterRows_MMX(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
int source_width, int source_y_fraction);
#endif

#ifdef MOZILLA_MAY_SUPPORT_SSE2
void FilterRows_SSE2(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
int source_width, int source_y_fraction);
#endif

static inline void FilterRows(uint8* ybuf, const uint8* y0_ptr,
const uint8* y1_ptr, int source_width,
int source_y_fraction) {
#ifdef MOZILLA_MAY_SUPPORT_SSE2
if (mozilla::supports_sse2()) {
FilterRows_SSE2(ybuf, y0_ptr, y1_ptr, source_width, source_y_fraction);
return;
}
#endif

#ifdef MOZILLA_MAY_SUPPORT_MMX
if (mozilla::supports_mmx()) {
FilterRows_MMX(ybuf, y0_ptr, y1_ptr, source_width, source_y_fraction);
return;
}
#endif

FilterRows_C(ybuf, y0_ptr, y1_ptr, source_width, source_y_fraction);
}

// Scale a frame of YUV to 32 bit ARGB.
void ScaleYCbCrToRGB32(const uint8* y_buf,
const uint8* u_buf,
const uint8* v_buf,
uint8* rgb_buf,
int source_width,
int source_height,
int width,
int height,
int y_pitch,
int uv_pitch,
int rgb_pitch,
YUVType yuv_type,
Rotate view_rotate,
ScaleFilter filter) {
bool has_mmx = supports_mmx();

// 4096 allows 3 buffers to fit in 12k.
// Helps performance on CPU with 16K L1 cache.
// Large enough for 3830x2160 and 30" displays which are 2560x1600.
const int kFilterBufferSize = 4096;
// Disable filtering if the screen is too big (to avoid buffer overflows).
// This should never happen to regular users: they don't have monitors
// wider than 4096 pixels.
// TODO(fbarchard): Allow rotated videos to filter.
if (source_width > kFilterBufferSize || view_rotate)
filter = FILTER_NONE;

unsigned int y_shift = yuv_type == YV12 ? 1 : 0;
// Diagram showing origin and direction of source sampling.
// ->0   4<-
// 7       3
//
// 6       5
// ->1   2<-
// Rotations that start at right side of image.
if ((view_rotate == ROTATE_180) ||
(view_rotate == ROTATE_270) ||
(view_rotate == MIRROR_ROTATE_0) ||
(view_rotate == MIRROR_ROTATE_90)) {
y_buf += source_width - 1;
u_buf += source_width / 2 - 1;
v_buf += source_width / 2 - 1;
source_width = -source_width;
}
// Rotations that start at bottom of image.
if ((view_rotate == ROTATE_90) ||
(view_rotate == ROTATE_180) ||
(view_rotate == MIRROR_ROTATE_90) ||
(view_rotate == MIRROR_ROTATE_180)) {
y_buf += (source_height - 1) * y_pitch;
u_buf += ((source_height >> y_shift) - 1) * uv_pitch;
v_buf += ((source_height >> y_shift) - 1) * uv_pitch;
source_height = -source_height;
}

// Handle zero sized destination.
if (width == 0 || height == 0)
return;
int source_dx = source_width * kFractionMax / width;
int source_dy = source_height * kFractionMax / height;
int source_dx_uv = source_dx;

if ((view_rotate == ROTATE_90) ||
(view_rotate == ROTATE_270)) {
int tmp = height;
height = width;
width = tmp;
tmp = source_height;
source_height = source_width;
source_width = tmp;
int original_dx = source_dx;
int original_dy = source_dy;
source_dx = ((original_dy >> kFractionBits) * y_pitch) << kFractionBits;
source_dx_uv = ((original_dy >> kFractionBits) * uv_pitch) << kFractionBits;
source_dy = original_dx;
if (view_rotate == ROTATE_90) {
y_pitch = -1;
uv_pitch = -1;
source_height = -source_height;
} else {
y_pitch = 1;
uv_pitch = 1;
}
}

// Need padding because FilterRows() will write 1 to 16 extra pixels
// after the end for SSE2 version.
uint8 yuvbuf[16 + kFilterBufferSize * 3 + 16];
uint8* ybuf =
reinterpret_cast<uint8*>(reinterpret_cast<uintptr_t>(yuvbuf + 15) & ~15);
uint8* ubuf = ybuf + kFilterBufferSize;
uint8* vbuf = ubuf + kFilterBufferSize;
// TODO(fbarchard): Fixed point math is off by 1 on negatives.
int yscale_fixed = (source_height << kFractionBits) / height;

// TODO(fbarchard): Split this into separate function for better efficiency.
for (int y = 0; y < height; ++y) {
uint8* dest_pixel = rgb_buf + y * rgb_pitch;
int source_y_subpixel = (y * yscale_fixed);
if (yscale_fixed >= (kFractionMax * 2)) {
source_y_subpixel += kFractionMax / 2;  // For 1/2 or less, center filter.
}
int source_y = source_y_subpixel >> kFractionBits;

const uint8* y0_ptr = y_buf + source_y * y_pitch;
const uint8* y1_ptr = y0_ptr + y_pitch;

const uint8* u0_ptr = u_buf + (source_y >> y_shift) * uv_pitch;
const uint8* u1_ptr = u0_ptr + uv_pitch;
const uint8* v0_ptr = v_buf + (source_y >> y_shift) * uv_pitch;
const uint8* v1_ptr = v0_ptr + uv_pitch;

// vertical scaler uses 16.8 fixed point
int source_y_fraction = (source_y_subpixel & kFractionMask) >> 8;
int source_uv_fraction =
((source_y_subpixel >> y_shift) & kFractionMask) >> 8;

const uint8* y_ptr = y0_ptr;
const uint8* u_ptr = u0_ptr;
const uint8* v_ptr = v0_ptr;
// Apply vertical filtering if necessary.
// TODO(fbarchard): Remove memcpy when not necessary.
if (filter & mozilla::gfx::FILTER_BILINEAR_V) {
if (yscale_fixed != kFractionMax &&
source_y_fraction && ((source_y + 1) < source_height)) {
FilterRows(ybuf, y0_ptr, y1_ptr, source_width, source_y_fraction);
} else {
memcpy(ybuf, y0_ptr, source_width);
}
y_ptr = ybuf;
ybuf[source_width] = ybuf[source_width-1];
int uv_source_width = (source_width + 1) / 2;
if (yscale_fixed != kFractionMax &&
source_uv_fraction &&
(((source_y >> y_shift) + 1) < (source_height >> y_shift))) {
FilterRows(ubuf, u0_ptr, u1_ptr, uv_source_width, source_uv_fraction);
FilterRows(vbuf, v0_ptr, v1_ptr, uv_source_width, source_uv_fraction);
} else {
memcpy(ubuf, u0_ptr, uv_source_width);
memcpy(vbuf, v0_ptr, uv_source_width);
}
u_ptr = ubuf;
v_ptr = vbuf;
ubuf[uv_source_width] = ubuf[uv_source_width - 1];
vbuf[uv_source_width] = vbuf[uv_source_width - 1];
}
if (source_dx == kFractionMax) {  // Not scaled
FastConvertYUVToRGB32Row(y_ptr, u_ptr, v_ptr,
dest_pixel, width);
} else if (filter & FILTER_BILINEAR_H) {
LinearScaleYUVToRGB32Row(y_ptr, u_ptr, v_ptr,
dest_pixel, width, source_dx);
} else {
// Specialized scalers and rotation.
#if defined(MOZILLA_MAY_SUPPORT_SSE) && defined(_MSC_VER) && defined(_M_IX86)
if(mozilla::supports_sse()) {
if (width == (source_width * 2)) {
DoubleYUVToRGB32Row_SSE(y_ptr, u_ptr, v_ptr,
dest_pixel, width);
} else if ((source_dx & kFractionMask) == 0) {
// Scaling by integer scale factor. ie half.
ConvertYUVToRGB32Row_SSE(y_ptr, u_ptr, v_ptr,
dest_pixel, width,
source_dx >> kFractionBits);
} else if (source_dx_uv == source_dx) {  // Not rotated.
ScaleYUVToRGB32Row(y_ptr, u_ptr, v_ptr,
dest_pixel, width, source_dx);
} else {
RotateConvertYUVToRGB32Row_SSE(y_ptr, u_ptr, v_ptr,
dest_pixel, width,
source_dx >> kFractionBits,
source_dx_uv >> kFractionBits);
}
}
else {
ScaleYUVToRGB32Row_C(y_ptr, u_ptr, v_ptr,
dest_pixel, width, source_dx);
}
#else
(void)source_dx_uv;
ScaleYUVToRGB32Row(y_ptr, u_ptr, v_ptr,
dest_pixel, width, source_dx);
#endif
}
}
// MMX used for FastConvertYUVToRGB32Row and FilterRows requires emms.
if (has_mmx)
EMMS();
}

} // namespace gfx
} // namespace mozilla
```