#include "apngloader.h"
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <iostream>
#include <memory>
#include <sstream>
#include <zlib.h>

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Macros
#define	swap16(data) (((data >> 8) & 255) \| ((data & 255) << 8))

#define	swap32(data) ((swap16(data) << 16) \| swap16(data >> 16))

#define	PNG_ZBUF_SIZE 32768

#define	PNG_DISPOSE_OP_NONE 0x00

#define	PNG_DISPOSE_OP_BACKGROUND 0x01

#define	PNG_DISPOSE_OP_PREVIOUS 0x02

#define	PNG_BLEND_OP_SOURCE 0x00

#define	PNG_BLEND_OP_OVER 0x01

#define	notabc(c) ((c) < 65 \|\| (c) > 122 \|\| ((c) > 90 && (c) < 97))

#define	ROWBYTES(pixel_bits, width)

Functions
unsigned int	read32 (std::istream &f1)

unsigned short	read16 (std::istream &f1)

unsigned short	readshort (unsigned char *p)

void	read_sub_row (unsigned char *row, unsigned int rowbytes, unsigned int bpp)

void	read_up_row (unsigned char row, unsigned char prev_row, unsigned int rowbytes, unsigned int)

void	read_average_row (unsigned char row, unsigned char prev_row, unsigned int rowbytes, unsigned int bpp)

void	read_paeth_row (unsigned char row, unsigned char prev_row, unsigned int rowbytes, unsigned int bpp)

void	unpack (z_stream &zstream, unsigned char dst, unsigned int dst_size, unsigned char src, unsigned int src_size, unsigned int h, unsigned int rowbytes, unsigned char bpp)

void	compose0 (unsigned char dst1, unsigned int dstbytes1, unsigned char dst2, unsigned int dstbytes2, unsigned char *src, unsigned int srcbytes, unsigned int w, unsigned int h, unsigned int bop, unsigned char depth)

void	compose2 (unsigned char dst1, unsigned int dstbytes1, unsigned char dst2, unsigned int dstbytes2, unsigned char *src, unsigned int srcbytes, unsigned int w, unsigned int h, unsigned int bop, unsigned char depth)

void	compose3 (unsigned char dst1, unsigned int dstbytes1, unsigned char dst2, unsigned int dstbytes2, unsigned char *src, unsigned int srcbytes, unsigned int w, unsigned int h, unsigned int bop, unsigned char depth)

void	compose4 (unsigned char dst, unsigned int dstbytes, unsigned char src, unsigned int srcbytes, unsigned int w, unsigned int h, unsigned int bop, unsigned char depth)

void	compose6 (unsigned char dst, unsigned int dstbytes, unsigned char src, unsigned int srcbytes, unsigned int w, unsigned int h, unsigned int bop, unsigned char depth)

int	load_apng (std::stringstream &file, struct apng_data *apng)

void	write_chunk (std::ostream &f, const char name, unsigned char data, unsigned int length)

void	write_IDATs (std::ostream &f, unsigned char *data, unsigned int length, unsigned int idat_size)

void	save_png (std::stringstream &f, unsigned int width, unsigned int height, int channels, unsigned char *pixels)

void	free_apng (struct apng_data *apng)

Variables
unsigned char	png_sign [8] = { 137, 80, 78, 71, 13, 10, 26, 10 }

int	mask4 [2] = { 240,15 }

int	shift4 [2] = { 4,0 }

int	mask2 [4] = { 192,48,12,3 }

int	shift2 [4] = { 6,4,2,0 }

int	mask1 [8] = { 128,64,32,16,8,4,2,1 }

int	shift1 [8] = { 7,6,5,4,3,2,1,0 }

unsigned int	keep_original = 1

unsigned char	pal [256][3]

unsigned char	trns [256]

unsigned int	palsize

unsigned int	trnssize

unsigned int	hasTRNS

unsigned short	trns1

unsigned short	trns2

unsigned short	trns3

Macro Definition Documentation

◆ notabc

#define notabc ( c ) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))

Definition at line 58 of file apngloader.cpp.

◆ PNG_BLEND_OP_OVER

#define PNG_BLEND_OP_OVER 0x01

Definition at line 56 of file apngloader.cpp.

◆ PNG_BLEND_OP_SOURCE

#define PNG_BLEND_OP_SOURCE 0x00

Definition at line 55 of file apngloader.cpp.

◆ PNG_DISPOSE_OP_BACKGROUND

#define PNG_DISPOSE_OP_BACKGROUND 0x01

Definition at line 52 of file apngloader.cpp.

◆ PNG_DISPOSE_OP_NONE

#define PNG_DISPOSE_OP_NONE 0x00

Definition at line 51 of file apngloader.cpp.

◆ PNG_DISPOSE_OP_PREVIOUS

#define PNG_DISPOSE_OP_PREVIOUS 0x02

Definition at line 53 of file apngloader.cpp.

◆ PNG_ZBUF_SIZE

#define PNG_ZBUF_SIZE 32768

Definition at line 49 of file apngloader.cpp.

◆ ROWBYTES

#define ROWBYTES	(	pixel_bits,
		width
	)

Value:

((pixel_bits) >= 8 ? \
((width) * (((unsigned int)(pixel_bits)) >> 3)) : \
(( ((width) * ((unsigned int)(pixel_bits))) + 7) >> 3) )

Definition at line 60 of file apngloader.cpp.

◆ swap16

#define swap16 ( data ) (((data >> 8) & 255) | ((data & 255) << 8))

Definition at line 45 of file apngloader.cpp.

◆ swap32

#define swap32 ( data ) ((swap16(data) << 16) | swap16(data >> 16))

Definition at line 46 of file apngloader.cpp.

Function Documentation

◆ compose0()

void compose0	(	unsigned char *	dst1,
		unsigned int	dstbytes1,
		unsigned char *	dst2,
		unsigned int	dstbytes2,
		unsigned char *	src,
		unsigned int	srcbytes,
		unsigned int	w,
		unsigned int	h,
		unsigned int	bop,
		unsigned char	depth
	)

Definition at line 200 of file apngloader.cpp.

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◆ compose2()

void compose2	(	unsigned char *	dst1,
		unsigned int	dstbytes1,
		unsigned char *	dst2,
		unsigned int	dstbytes2,
		unsigned char *	src,
		unsigned int	srcbytes,
		unsigned int	w,
		unsigned int	h,
		unsigned int	bop,
		unsigned char	depth
	)

Definition at line 242 of file apngloader.cpp.

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◆ compose3()

void compose3	(	unsigned char *	dst1,
		unsigned int	dstbytes1,
		unsigned char *	dst2,
		unsigned int	dstbytes2,
		unsigned char *	src,
		unsigned int	srcbytes,
		unsigned int	w,
		unsigned int	h,
		unsigned int	bop,
		unsigned char	depth
	)

Definition at line 314 of file apngloader.cpp.

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◆ compose4()

void compose4	(	unsigned char *	dst,
		unsigned int	dstbytes,
		unsigned char *	src,
		unsigned int	srcbytes,
		unsigned int	w,
		unsigned int	h,
		unsigned int	bop,
		unsigned char	depth
	)

Definition at line 391 of file apngloader.cpp.

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◆ compose6()

void compose6	(	unsigned char *	dst,
		unsigned int	dstbytes,
		unsigned char *	src,
		unsigned int	srcbytes,
		unsigned int	w,
		unsigned int	h,
		unsigned int	bop,
		unsigned char	depth
	)

Definition at line 451 of file apngloader.cpp.

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◆ free_apng()

void free_apng ( struct apng_data * apng )

Definition at line 1154 of file apngloader.cpp.

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◆ load_apng()

int load_apng	(	std::stringstream &	file,
		struct apng_data *	apng
	)

Definition at line 515 of file apngloader.cpp.

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◆ read16()

unsigned short read16 ( std::istream & f1 )

Definition at line 95 of file apngloader.cpp.

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◆ read32()

unsigned int read32 ( std::istream & f1 )

Definition at line 85 of file apngloader.cpp.

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◆ read_average_row()

void read_average_row	(	unsigned char *	row,
		unsigned char *	prev_row,
		unsigned int	rowbytes,
		unsigned int	bpp
	)

Definition at line 125 of file apngloader.cpp.

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◆ read_paeth_row()

void read_paeth_row	(	unsigned char *	row,
		unsigned char *	prev_row,
		unsigned int	rowbytes,
		unsigned int	bpp
	)

Definition at line 143 of file apngloader.cpp.

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◆ read_sub_row()

void read_sub_row	(	unsigned char *	row,
		unsigned int	rowbytes,
		unsigned int	bpp
	)

Definition at line 108 of file apngloader.cpp.

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◆ read_up_row()

void read_up_row	(	unsigned char *	row,
		unsigned char *	prev_row,
		unsigned int	rowbytes,
		unsigned int
	)

Definition at line 116 of file apngloader.cpp.

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◆ readshort()

unsigned short readshort ( unsigned char * p )

Definition at line 103 of file apngloader.cpp.

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◆ save_png()

void save_png	(	std::stringstream &	f,
		unsigned int	width,
		unsigned int	height,
		int	channels,
		unsigned char *	pixels
	)

Definition at line 927 of file apngloader.cpp.

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◆ unpack()

void unpack	(	z_stream &	zstream,
		unsigned char *	dst,
		unsigned int	dst_size,
		unsigned char *	src,
		unsigned int	src_size,
		unsigned int	h,
		unsigned int	rowbytes,
		unsigned char	bpp
	)

Definition at line 172 of file apngloader.cpp.

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◆ write_chunk()

void write_chunk	(	std::ostream &	f,
		const char *	name,
		unsigned char *	data,
		unsigned int	length
	)

Definition at line 872 of file apngloader.cpp.

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◆ write_IDATs()

void write_IDATs	(	std::ostream &	f,
		unsigned char *	data,
		unsigned int	length,
		unsigned int	idat_size
	)

Definition at line 890 of file apngloader.cpp.

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Variable Documentation

◆ hasTRNS

unsigned int hasTRNS

Definition at line 80 of file apngloader.cpp.

◆ keep_original

unsigned int keep_original = 1

Definition at line 76 of file apngloader.cpp.

◆ mask1

int mask1[8] = { 128,64,32,16,8,4,2,1 }

Definition at line 73 of file apngloader.cpp.

◆ mask2

int mask2[4] = { 192,48,12,3 }

Definition at line 70 of file apngloader.cpp.

◆ mask4

int mask4[2] = { 240,15 }

Definition at line 67 of file apngloader.cpp.

◆ pal

unsigned char pal[256][3]

Definition at line 77 of file apngloader.cpp.

◆ palsize

unsigned int palsize

Definition at line 79 of file apngloader.cpp.

◆ png_sign

unsigned char png_sign[8] = { 137, 80, 78, 71, 13, 10, 26, 10 }

Definition at line 65 of file apngloader.cpp.

◆ shift1

int shift1[8] = { 7,6,5,4,3,2,1,0 }

Definition at line 74 of file apngloader.cpp.

◆ shift2

int shift2[4] = { 6,4,2,0 }

Definition at line 71 of file apngloader.cpp.

◆ shift4

int shift4[2] = { 4,0 }

Definition at line 68 of file apngloader.cpp.

◆ trns

unsigned char trns[256]

Definition at line 78 of file apngloader.cpp.

◆ trns1

unsigned short trns1

Definition at line 81 of file apngloader.cpp.

◆ trns2

unsigned short trns2

Definition at line 81 of file apngloader.cpp.

◆ trns3

unsigned short trns3

Definition at line 81 of file apngloader.cpp.

◆ trnssize

unsigned int trnssize

Definition at line 79 of file apngloader.cpp.

Macros

Functions

Variables

Macro Definition Documentation

◆ notabc

◆ PNG_BLEND_OP_OVER

◆ PNG_BLEND_OP_SOURCE

◆ PNG_DISPOSE_OP_BACKGROUND

◆ PNG_DISPOSE_OP_NONE

◆ PNG_DISPOSE_OP_PREVIOUS

◆ PNG_ZBUF_SIZE

◆ ROWBYTES

◆ swap16

◆ swap32

Function Documentation

◆ compose0()

◆ compose2()

◆ compose3()

◆ compose4()

◆ compose6()

◆ free_apng()

◆ load_apng()

◆ read16()

◆ read32()

◆ read_average_row()

◆ read_paeth_row()

◆ read_sub_row()

◆ read_up_row()

◆ readshort()

◆ save_png()

◆ unpack()

◆ write_chunk()

◆ write_IDATs()

Variable Documentation

◆ hasTRNS

◆ keep_original

◆ mask1

◆ mask2

◆ mask4

◆ pal

◆ palsize

◆ png_sign

◆ shift1

◆ shift2

◆ shift4

◆ trns

◆ trns1

◆ trns2

◆ trns3

◆ trnssize