170 lines
9.0 KiB
C
170 lines
9.0 KiB
C
/*
|
|
* Copyright (C) 2015 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "swscale_internal.h"
|
|
|
|
int ff_sws_alphablendaway(SwsContext *c, const uint8_t *src[],
|
|
int srcStride[], int srcSliceY, int srcSliceH,
|
|
uint8_t *dst[], int dstStride[])
|
|
{
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
|
|
int nb_components = desc->nb_components;
|
|
int plane, x, y;
|
|
int plane_count = isGray(c->srcFormat) ? 1 : 3;
|
|
int sixteen_bits = desc->comp[0].depth >= 9;
|
|
unsigned off = 1<<(desc->comp[0].depth - 1);
|
|
unsigned shift = desc->comp[0].depth;
|
|
unsigned max = (1<<shift) - 1;
|
|
int target_table[2][3];
|
|
|
|
for (plane = 0; plane < plane_count; plane++) {
|
|
int a = 0, b = 0;
|
|
if (c->alphablend == SWS_ALPHA_BLEND_CHECKERBOARD) {
|
|
a = (1<<(desc->comp[0].depth - 1))/2;
|
|
b = 3*(1<<(desc->comp[0].depth-1))/2;
|
|
}
|
|
target_table[0][plane] = plane && !(desc->flags & AV_PIX_FMT_FLAG_RGB) ? 1<<(desc->comp[0].depth - 1) : a;
|
|
target_table[1][plane] = plane && !(desc->flags & AV_PIX_FMT_FLAG_RGB) ? 1<<(desc->comp[0].depth - 1) : b;
|
|
}
|
|
|
|
av_assert0(plane_count == nb_components - 1);
|
|
if (desc->flags & AV_PIX_FMT_FLAG_PLANAR) {
|
|
for (plane = 0; plane < plane_count; plane++) {
|
|
int w = plane ? c->chrSrcW : c->srcW;
|
|
int x_subsample = plane ? desc->log2_chroma_w: 0;
|
|
int y_subsample = plane ? desc->log2_chroma_h: 0;
|
|
for (y = srcSliceY >> y_subsample; y < FF_CEIL_RSHIFT(srcSliceH, y_subsample); y++) {
|
|
if (x_subsample || y_subsample) {
|
|
int alpha;
|
|
unsigned u;
|
|
if (sixteen_bits) {
|
|
ptrdiff_t alpha_step = srcStride[plane_count] >> 1;
|
|
const uint16_t *s = (const uint16_t *)(src[plane ] + srcStride[plane ] * y);
|
|
const uint16_t *a = (const uint16_t *)(src[plane_count] + (srcStride[plane_count] * y << y_subsample));
|
|
uint16_t *d = ( uint16_t *)(dst[plane ] + dstStride[plane ] * y);
|
|
if ((!isBE(c->srcFormat)) == !HAVE_BIGENDIAN) {
|
|
for (x = 0; x < w; x++) {
|
|
if (y_subsample) {
|
|
alpha = (a[2*x] + a[2*x + 1] + 2 +
|
|
a[2*x + alpha_step] + a[2*x + alpha_step + 1]) >> 2;
|
|
} else
|
|
alpha = (a[2*x] + a[2*x + 1]) >> 1;
|
|
u = s[x]*alpha + target_table[((x^y)>>5)&1][plane]*(max-alpha) + off;
|
|
d[x] = av_clip((u + (u >> shift)) >> shift, 0, max);
|
|
}
|
|
} else {
|
|
for (x = 0; x < w; x++) {
|
|
if (y_subsample) {
|
|
alpha = (av_bswap16(a[2*x]) + av_bswap16(a[2*x + 1]) + 2 +
|
|
av_bswap16(a[2*x + alpha_step]) + av_bswap16(a[2*x + alpha_step + 1])) >> 2;
|
|
} else
|
|
alpha = (av_bswap16(a[2*x]) + av_bswap16(a[2*x + 1])) >> 1;
|
|
u = av_bswap16(s[x])*alpha + target_table[((x^y)>>5)&1][plane]*(max-alpha) + off;
|
|
d[x] = av_clip((u + (u >> shift)) >> shift, 0, max);
|
|
}
|
|
}
|
|
} else {
|
|
ptrdiff_t alpha_step = srcStride[plane_count];
|
|
const uint8_t *s = src[plane ] + srcStride[plane] * y;
|
|
const uint8_t *a = src[plane_count] + (srcStride[plane_count] * y << y_subsample);
|
|
uint8_t *d = dst[plane ] + dstStride[plane] * y;
|
|
for (x = 0; x < w; x++) {
|
|
if (y_subsample) {
|
|
alpha = (a[2*x] + a[2*x + 1] + 2 +
|
|
a[2*x + alpha_step] + a[2*x + alpha_step + 1]) >> 2;
|
|
} else
|
|
alpha = (a[2*x] + a[2*x + 1]) >> 1;
|
|
u = s[x]*alpha + target_table[((x^y)>>5)&1][plane]*(255-alpha) + 128;
|
|
d[x] = (257*u) >> 16;
|
|
}
|
|
}
|
|
} else {
|
|
if (sixteen_bits) {
|
|
const uint16_t *s = (const uint16_t *)(src[plane ] + srcStride[plane ] * y);
|
|
const uint16_t *a = (const uint16_t *)(src[plane_count] + srcStride[plane_count] * y);
|
|
uint16_t *d = ( uint16_t *)(dst[plane ] + dstStride[plane ] * y);
|
|
if ((!isBE(c->srcFormat)) == !HAVE_BIGENDIAN) {
|
|
for (x = 0; x < w; x++) {
|
|
unsigned u = s[x]*a[x] + target_table[((x^y)>>5)&1][plane]*(max-a[x]) + off;
|
|
d[x] = av_clip((u + (u >> shift)) >> shift, 0, max);
|
|
}
|
|
} else {
|
|
for (x = 0; x < w; x++) {
|
|
unsigned aswap =av_bswap16(a[x]);
|
|
unsigned u = av_bswap16(s[x])*aswap + target_table[((x^y)>>5)&1][plane]*(max-aswap) + off;
|
|
d[x] = av_clip((u + (u >> shift)) >> shift, 0, max);
|
|
}
|
|
}
|
|
} else {
|
|
const uint8_t *s = src[plane ] + srcStride[plane] * y;
|
|
const uint8_t *a = src[plane_count] + srcStride[plane_count] * y;
|
|
uint8_t *d = dst[plane ] + dstStride[plane] * y;
|
|
for (x = 0; x < w; x++) {
|
|
unsigned u = s[x]*a[x] + target_table[((x^y)>>5)&1][plane]*(255-a[x]) + 128;
|
|
d[x] = (257*u) >> 16;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
int alpha_pos = desc->comp[plane_count].offset;
|
|
int w = c->srcW;
|
|
for (y = srcSliceY; y < srcSliceH; y++) {
|
|
if (sixteen_bits) {
|
|
const uint16_t *s = (const uint16_t *)(src[0] + srcStride[0] * y + 2*!alpha_pos);
|
|
const uint16_t *a = (const uint16_t *)(src[0] + srcStride[0] * y + alpha_pos);
|
|
uint16_t *d = ( uint16_t *)(dst[0] + dstStride[0] * y);
|
|
if ((!isBE(c->srcFormat)) == !HAVE_BIGENDIAN) {
|
|
for (x = 0; x < w; x++) {
|
|
for (plane = 0; plane < plane_count; plane++) {
|
|
int x_index = (plane_count + 1) * x;
|
|
unsigned u = s[x_index + plane]*a[x_index] + target_table[((x^y)>>5)&1][plane]*(max-a[x_index]) + off;
|
|
d[plane_count*x + plane] = av_clip((u + (u >> shift)) >> shift, 0, max);
|
|
}
|
|
}
|
|
} else {
|
|
for (x = 0; x < w; x++) {
|
|
for (plane = 0; plane < plane_count; plane++) {
|
|
int x_index = (plane_count + 1) * x;
|
|
unsigned aswap =av_bswap16(a[x_index]);
|
|
unsigned u = av_bswap16(s[x_index + plane])*aswap + target_table[((x^y)>>5)&1][plane]*(max-aswap) + off;
|
|
d[plane_count*x + plane] = av_clip((u + (u >> shift)) >> shift, 0, max);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
const uint8_t *s = src[0] + srcStride[0] * y + !alpha_pos;
|
|
const uint8_t *a = src[0] + srcStride[0] * y + alpha_pos;
|
|
uint8_t *d = dst[0] + dstStride[0] * y;
|
|
for (x = 0; x < w; x++) {
|
|
for (plane = 0; plane < plane_count; plane++) {
|
|
int x_index = (plane_count + 1) * x;
|
|
unsigned u = s[x_index + plane]*a[x_index] + target_table[((x^y)>>5)&1][plane]*(255-a[x_index]) + 128;
|
|
d[plane_count*x + plane] = (257*u) >> 16;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|