FFmpeg
libavcodec
png.h
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/*
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* PNG image format
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* Copyright (c) 2003 Fabrice Bellard
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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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#ifndef AVCODEC_PNG_H
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#define AVCODEC_PNG_H
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#include <stdint.h>
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#include "
pngdsp.h
"
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#define PNG_COLOR_MASK_PALETTE 1
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#define PNG_COLOR_MASK_COLOR 2
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#define PNG_COLOR_MASK_ALPHA 4
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#define PNG_COLOR_TYPE_GRAY 0
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#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
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#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
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#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
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#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
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#define PNG_FILTER_TYPE_LOCO 64
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#define PNG_FILTER_VALUE_NONE 0
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#define PNG_FILTER_VALUE_SUB 1
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#define PNG_FILTER_VALUE_UP 2
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#define PNG_FILTER_VALUE_AVG 3
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#define PNG_FILTER_VALUE_PAETH 4
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#define PNG_FILTER_VALUE_MIXED 5
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#define NB_PASSES 7
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#define PNGSIG 0x89504e470d0a1a0a
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#define MNGSIG 0x8a4d4e470d0a1a0a
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/* Mask to determine which y pixels are valid in a pass */
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extern
const
uint8_t
ff_png_pass_ymask
[
NB_PASSES
];
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int
ff_png_get_nb_channels
(
int
color_type);
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/* compute the row size of an interleaved pass */
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int
ff_png_pass_row_size
(
int
pass,
int
bits_per_pixel,
int
width
);
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void
ff_add_png_paeth_prediction
(uint8_t *
dst
, uint8_t *
src
, uint8_t *top,
int
w
,
int
bpp);
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void
ff_png_filter_row
(
PNGDSPContext
*dsp, uint8_t *
dst
,
int
filter_type,
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uint8_t *
src
, uint8_t *last,
int
size
,
int
bpp);
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#endif
/* AVCODEC_PNG_H */
PNGDSPContext
Definition:
pngdsp.h:27
ff_png_pass_row_size
int ff_png_pass_row_size(int pass, int bits_per_pixel, int width)
Definition:
png.c:54
w
uint8_t w
Definition:
llviddspenc.c:38
NB_PASSES
#define NB_PASSES
Definition:
png.h:47
pngdsp.h
ff_png_pass_ymask
const uint8_t ff_png_pass_ymask[NB_PASSES]
Definition:
png.c:27
ff_png_get_nb_channels
int ff_png_get_nb_channels(int color_type)
Definition:
png.c:41
dst
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
Definition:
dsp.h:83
size
int size
Definition:
twinvq_data.h:10344
ff_png_filter_row
void ff_png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type, uint8_t *src, uint8_t *last, int size, int bpp)
Definition:
pngdec.c:284
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:218
width
#define width
Definition:
dsp.h:85
src
#define src
Definition:
vp8dsp.c:248
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