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libavcodec
pngdsp.c
Go to the documentation of this file.
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/*
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* PNG image format
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* Copyright (c) 2008 Loren Merrit <lorenm@u.washington.edu>
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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 "
libavutil/attributes.h
"
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#include "
libavutil/common.h
"
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#include "
png.h
"
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#include "
pngdsp.h
"
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// 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
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#define pb_7f (~0UL / 255 * 0x7f)
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#define pb_80 (~0UL / 255 * 0x80)
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static
void
add_bytes_l2_c
(
uint8_t
*dst,
uint8_t
*
src1
,
uint8_t
*src2,
int
w)
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{
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long
i;
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for
(i = 0; i <= w - (
int
)
sizeof
(
long
); i +=
sizeof
(long)) {
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long
a
= *(
long
*)(src1 + i);
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long
b
= *(
long
*)(src2 + i);
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*(
long
*)(dst + i) = ((a &
pb_7f
) + (b &
pb_7f
)) ^ ((a ^ b) &
pb_80
);
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}
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for
(; i < w; i++)
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dst[i] = src1[i] + src2[i];
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}
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av_cold
void
ff_pngdsp_init
(
PNGDSPContext
*dsp)
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{
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dsp->
add_bytes_l2
=
add_bytes_l2_c
;
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dsp->
add_paeth_prediction
=
ff_add_png_paeth_prediction
;
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if
(ARCH_X86)
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ff_pngdsp_init_x86
(dsp);
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}
pb_80
#define pb_80
Definition:
pngdsp.c:29
PNGDSPContext::add_bytes_l2
void(* add_bytes_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
Definition:
pngdsp.h:28
png.h
b
const char * b
Definition:
vf_curves.c:113
attributes.h
Macro definitions for various function/variable attributes.
uint8_t
uint8_t
Definition:
audio_convert.c:194
av_cold
#define av_cold
Definition:
attributes.h:82
pngdsp.h
PNGDSPContext
Definition:
pngdsp.h:27
add_bytes_l2_c
static void add_bytes_l2_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
Definition:
pngdsp.c:31
PNGDSPContext::add_paeth_prediction
void(* add_paeth_prediction)(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
Definition:
pngdsp.h:33
pb_7f
#define pb_7f
Definition:
pngdsp.c:28
ff_pngdsp_init
av_cold void ff_pngdsp_init(PNGDSPContext *dsp)
Definition:
pngdsp.c:43
src1
#define src1
Definition:
h264pred.c:139
ff_pngdsp_init_x86
void ff_pngdsp_init_x86(PNGDSPContext *dsp)
Definition:
pngdsp_init.c:36
int
int
Definition:
ffmpeg_filter.c:190
common.h
common internal and external API header
ff_add_png_paeth_prediction
void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
Definition:
pngdec.c:184
a
a
Definition:
h264pred_template.c:468
Generated on Fri Jan 12 2018 01:45:45 for FFmpeg by
1.8.6