mirror of
https://github.com/FFmpeg/FFmpeg.git
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c1a0e65763
I want to move away from having random leaf processing functions mutate plane pointers, and while we're at it, we might as well make the strides and tables const as well. Sponsored-by: Sovereign Tech Fund Signed-off-by: Niklas Haas <git@haasn.dev>
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(SwsContext *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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