#include <stdint.h>
#include "pngdsp.h"

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
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)

void	ff_png_filter_row (PNGDSPContext dsp, uint8_t dst, int filter_type, uint8_t src, uint8_t last, int size, 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 29 of file png.h.

◆ PNG_COLOR_MASK_COLOR

#define PNG_COLOR_MASK_COLOR 2

Definition at line 30 of file png.h.

◆ PNG_COLOR_MASK_ALPHA

#define PNG_COLOR_MASK_ALPHA 4

Definition at line 31 of file png.h.

◆ PNG_COLOR_TYPE_GRAY

#define PNG_COLOR_TYPE_GRAY 0

Definition at line 33 of file png.h.

◆ PNG_COLOR_TYPE_PALETTE

#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)

Definition at line 34 of file png.h.

◆ PNG_COLOR_TYPE_RGB

#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)

Definition at line 35 of file png.h.

◆ PNG_COLOR_TYPE_RGB_ALPHA

#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)

Definition at line 36 of file png.h.

◆ PNG_COLOR_TYPE_GRAY_ALPHA

#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)

Definition at line 37 of file png.h.

◆ PNG_FILTER_TYPE_LOCO

#define PNG_FILTER_TYPE_LOCO 64

Definition at line 39 of file png.h.

◆ PNG_FILTER_VALUE_NONE

#define PNG_FILTER_VALUE_NONE 0

Definition at line 40 of file png.h.

◆ PNG_FILTER_VALUE_SUB

#define PNG_FILTER_VALUE_SUB 1

Definition at line 41 of file png.h.

◆ PNG_FILTER_VALUE_UP

#define PNG_FILTER_VALUE_UP 2

Definition at line 42 of file png.h.

◆ PNG_FILTER_VALUE_AVG

#define PNG_FILTER_VALUE_AVG 3

Definition at line 43 of file png.h.

◆ PNG_FILTER_VALUE_PAETH

#define PNG_FILTER_VALUE_PAETH 4

Definition at line 44 of file png.h.

◆ PNG_FILTER_VALUE_MIXED

#define PNG_FILTER_VALUE_MIXED 5

Definition at line 45 of file png.h.

◆ NB_PASSES

#define NB_PASSES 7

Definition at line 47 of file png.h.

◆ PNGSIG

#define PNGSIG 0x89504e470d0a1a0a

Definition at line 49 of file png.h.

◆ MNGSIG

#define MNGSIG 0x8a4d4e470d0a1a0a

Definition at line 50 of file png.h.

Function Documentation

◆ ff_png_get_nb_channels()

int ff_png_get_nb_channels ( int color_type )

Definition at line 41 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 54 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 203 of file pngdec.c.

Referenced by ff_png_filter_row(), and ff_pngdsp_init().

◆ 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 at line 269 of file pngdec.c.

Referenced by handle_row(), and png_handle_row().

Variable Documentation

◆ ff_png_pass_ymask

const uint8_t ff_png_pass_ymask[NB_PASSES]

Definition at line 27 of file png.c.

Referenced by encode_frame(), and png_handle_row().

Macros

Functions

Variables