Spaces:
Runtime error
Runtime error
File size: 9,351 Bytes
b86f76f |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 |
/*
* Copyright (C) 2015 Michael Niedermayer <[email protected]>
*
* 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, ysrc;
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 (ysrc = 0; ysrc < AV_CEIL_RSHIFT(srcSliceH, y_subsample); ysrc++) {
int y = ysrc + (srcSliceY >> y_subsample);
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 ] * ysrc);
const uint16_t *a = (const uint16_t *)(src[plane_count] + (srcStride[plane_count] * ysrc << 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] * ysrc;
const uint8_t *a = src[plane_count] + (srcStride[plane_count] * ysrc << 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 ] * ysrc);
const uint16_t *a = (const uint16_t *)(src[plane_count] + srcStride[plane_count] * ysrc);
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] * ysrc;
const uint8_t *a = src[plane_count] + srcStride[plane_count] * ysrc;
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 (ysrc = 0; ysrc < srcSliceH; ysrc++) {
int y = ysrc + srcSliceY;
if (sixteen_bits) {
const uint16_t *s = (const uint16_t *)(src[0] + srcStride[0] * ysrc + 2*!alpha_pos);
const uint16_t *a = (const uint16_t *)(src[0] + srcStride[0] * ysrc + 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] * ysrc + !alpha_pos;
const uint8_t *a = src[0] + srcStride[0] * ysrc + 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;
}
|