FFmpeg: libavcodec/png.h File Reference

FFmpeg 4.0

libavcodec

#include <stdint.h>

Go to the source code of this file.

Macros
#define	PNG_COLOR_MASK_PALETTE 1

#define	PNG_COLOR_MASK_COLOR 2

#define	PNG_COLOR_MASK_ALPHA 4

#define	PNG_COLOR_TYPE_GRAY 0

#define	PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR \| PNG_COLOR_MASK_PALETTE)

#define	PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)

#define	PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR \| PNG_COLOR_MASK_ALPHA)

#define	PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)

#define	PNG_FILTER_TYPE_LOCO 64

#define	PNG_FILTER_VALUE_NONE 0

#define	PNG_FILTER_VALUE_SUB 1

#define	PNG_FILTER_VALUE_UP 2

#define	PNG_FILTER_VALUE_AVG 3

#define	PNG_FILTER_VALUE_PAETH 4

#define	PNG_FILTER_VALUE_MIXED 5

#define	NB_PASSES 7

#define	PNGSIG 0x89504e470d0a1a0a

#define	MNGSIG 0x8a4d4e470d0a1a0a

Functions
void *	ff_png_zalloc (void *opaque, unsigned int items, unsigned int size)

void	ff_png_zfree (void opaque, void ptr)

int	ff_png_get_nb_channels (int color_type)

int	ff_png_pass_row_size (int pass, int bits_per_pixel, int width)

void	ff_add_png_paeth_prediction (uint8_t dst, uint8_t src, uint8_t *top, int w, int bpp)

Variables
const uint8_t	ff_png_pass_ymask [NB_PASSES]

Macro Definition Documentation

◆ PNG_COLOR_MASK_PALETTE

#define PNG_COLOR_MASK_PALETTE 1

Definition at line 27 of file png.h.

Referenced by ff_png_get_nb_channels().

◆ PNG_COLOR_MASK_COLOR

#define PNG_COLOR_MASK_COLOR 2

Definition at line 28 of file png.h.

Referenced by ff_png_get_nb_channels().

◆ PNG_COLOR_MASK_ALPHA

#define PNG_COLOR_MASK_ALPHA 4

Definition at line 29 of file png.h.

Referenced by ff_png_get_nb_channels().

◆ PNG_COLOR_TYPE_GRAY

#define PNG_COLOR_TYPE_GRAY 0

Definition at line 31 of file png.h.

Referenced by decode_idat_chunk(), decode_trns_chunk(), and png_enc_init().

◆ PNG_COLOR_TYPE_PALETTE

#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)

Definition at line 32 of file png.h.

Referenced by decode_frame_common(), decode_idat_chunk(), decode_trns_chunk(), encode_apng(), encode_headers(), handle_small_bpp(), and png_enc_init().

◆ PNG_COLOR_TYPE_RGB

#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)

Definition at line 33 of file png.h.

Referenced by decode_idat_chunk(), decode_trns_chunk(), and png_enc_init().

◆ PNG_COLOR_TYPE_RGB_ALPHA

#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)

Definition at line 34 of file png.h.

Referenced by decode_idat_chunk(), png_enc_init(), and png_handle_row().

◆ PNG_COLOR_TYPE_GRAY_ALPHA

#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)

Definition at line 35 of file png.h.

Referenced by decode_idat_chunk(), and png_enc_init().

◆ PNG_FILTER_TYPE_LOCO

#define PNG_FILTER_TYPE_LOCO 64

Definition at line 37 of file png.h.

Referenced by png_handle_row().

◆ PNG_FILTER_VALUE_NONE

#define PNG_FILTER_VALUE_NONE 0

Definition at line 38 of file png.h.

Referenced by png_enc_init(), and png_filter_row().

◆ PNG_FILTER_VALUE_SUB

#define PNG_FILTER_VALUE_SUB 1

Definition at line 39 of file png.h.

Referenced by png_choose_filter(), and png_filter_row().

◆ PNG_FILTER_VALUE_UP

#define PNG_FILTER_VALUE_UP 2

Definition at line 40 of file png.h.

Referenced by png_filter_row().

◆ PNG_FILTER_VALUE_AVG

#define PNG_FILTER_VALUE_AVG 3

Definition at line 41 of file png.h.

Referenced by png_filter_row().

◆ PNG_FILTER_VALUE_PAETH

#define PNG_FILTER_VALUE_PAETH 4

Definition at line 42 of file png.h.

Referenced by png_filter_row().

◆ PNG_FILTER_VALUE_MIXED

#define PNG_FILTER_VALUE_MIXED 5

Definition at line 43 of file png.h.

Referenced by encode_frame(), png_choose_filter(), and png_enc_init().

◆ NB_PASSES

#define NB_PASSES 7

Definition at line 45 of file png.h.

Referenced by encode_frame(), and png_handle_row().

◆ PNGSIG

#define PNGSIG 0x89504e470d0a1a0a

Definition at line 47 of file png.h.

Referenced by apng_probe(), apng_read_header(), apng_write_header(), decode_frame_common(), encode_png(), png_parse(), and probe().

◆ MNGSIG

#define MNGSIG 0x8a4d4e470d0a1a0a

Definition at line 48 of file png.h.

Referenced by decode_frame_common(), and png_parse().

Function Documentation

◆ ff_png_zalloc()

void* ff_png_zalloc	(	void *	opaque,
		unsigned int	items,
		unsigned int	size
	)

Definition at line 39 of file png.c.

Referenced by decode_frame_common(), decode_zbuf(), and png_enc_init().

◆ ff_png_zfree()

void ff_png_zfree	(	void *	opaque,
		void *	ptr
	)

Definition at line 44 of file png.c.

Referenced by decode_frame_common(), decode_zbuf(), and png_enc_init().

◆ ff_png_get_nb_channels()

int ff_png_get_nb_channels ( int color_type )

Definition at line 49 of file png.c.

Referenced by decode_idat_chunk(), and png_enc_init().

◆ ff_png_pass_row_size()

int ff_png_pass_row_size	(	int	pass,
		int	bits_per_pixel,
		int	width
	)

Definition at line 62 of file png.c.

Referenced by decode_idat_chunk(), encode_frame(), and png_handle_row().

◆ 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 at line 185 of file pngdec.c.

Referenced by ff_pngdsp_init(), and png_filter_row().

Variable Documentation

◆ ff_png_pass_ymask

const uint8_t ff_png_pass_ymask[NB_PASSES]

Definition at line 25 of file png.c.

Referenced by encode_frame(), and png_handle_row().