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