lodepng.cpp File Reference

#include "lodepng.h"
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>

Include dependency graph for lodepng.cpp:

Data Structures
struct	uivector
struct	ucvector
struct	HuffmanTree
struct	BPMNode
struct	BPMLists
struct	Hash
struct	ColorTree

Macros
#define	CERROR_BREAK(errorvar, code)
#define	ERROR_BREAK(code)   CERROR_BREAK(error, code)
#define	CERROR_RETURN_ERROR(errorvar, code)
#define	CERROR_TRY_RETURN(call)
#define	CERROR_RETURN(errorvar, code)
#define	addBitToStream(bitpointer, bitstream, bit)
#define	READBIT(bitpointer, bitstream)   ((bitstream[bitpointer >> 3] >> (bitpointer & 0x7)) & (unsigned char)1)
#define	FIRST_LENGTH_CODE_INDEX   257
#define	LAST_LENGTH_CODE_INDEX   285
#define	NUM_DEFLATE_CODE_SYMBOLS   288
#define	NUM_DISTANCE_SYMBOLS   32
#define	NUM_CODE_LENGTH_CODES   19
#define	DEFAULT_WINDOWSIZE   2048

Typedefs
typedef struct uivector	uivector
typedef struct ucvector	ucvector
typedef struct HuffmanTree	HuffmanTree
typedef struct BPMNode	BPMNode
typedef struct BPMLists	BPMLists
typedef struct Hash	Hash
typedef struct ColorTree	ColorTree

Functions
unsigned	lodepng_read32bitInt (const unsigned char *buffer)
unsigned	lodepng_load_file (unsigned char **out, size_t *outsize, const char *filename)
unsigned	lodepng_save_file (const unsigned char *buffer, size_t buffersize, const char *filename)
unsigned	lodepng_huffman_code_lengths (unsigned *lengths, const unsigned *frequencies, size_t numcodes, unsigned maxbitlen)
unsigned	lodepng_inflate (unsigned char **out, size_t *outsize, const unsigned char *in, size_t insize, const LodePNGDecompressSettings *settings)
unsigned	lodepng_deflate (unsigned char **out, size_t *outsize, const unsigned char *in, size_t insize, const LodePNGCompressSettings *settings)
unsigned	lodepng_zlib_decompress (unsigned char **out, size_t *outsize, const unsigned char *in, size_t insize, const LodePNGDecompressSettings *settings)
unsigned	lodepng_zlib_compress (unsigned char **out, size_t *outsize, const unsigned char *in, size_t insize, const LodePNGCompressSettings *settings)
void	lodepng_compress_settings_init (LodePNGCompressSettings *settings)
void	lodepng_decompress_settings_init (LodePNGDecompressSettings *settings)
unsigned	lodepng_crc32 (const unsigned char *data, size_t length)
unsigned	lodepng_chunk_length (const unsigned char *chunk)
void	lodepng_chunk_type (char type[5], const unsigned char *chunk)
unsigned char	lodepng_chunk_type_equals (const unsigned char *chunk, const char *type)
unsigned char	lodepng_chunk_ancillary (const unsigned char *chunk)
unsigned char	lodepng_chunk_private (const unsigned char *chunk)
unsigned char	lodepng_chunk_safetocopy (const unsigned char *chunk)
unsigned char *	lodepng_chunk_data (unsigned char *chunk)
const unsigned char *	lodepng_chunk_data_const (const unsigned char *chunk)
unsigned	lodepng_chunk_check_crc (const unsigned char *chunk)
void	lodepng_chunk_generate_crc (unsigned char *chunk)
unsigned char *	lodepng_chunk_next (unsigned char *chunk)
const unsigned char *	lodepng_chunk_next_const (const unsigned char *chunk)
unsigned	lodepng_chunk_append (unsigned char **out, size_t *outlength, const unsigned char *chunk)
unsigned	lodepng_chunk_create (unsigned char **out, size_t *outlength, unsigned length, const char *type, const unsigned char *data)
void	lodepng_color_mode_init (LodePNGColorMode *info)
void	lodepng_color_mode_cleanup (LodePNGColorMode *info)
unsigned	lodepng_color_mode_copy (LodePNGColorMode *dest, const LodePNGColorMode *source)
void	lodepng_palette_clear (LodePNGColorMode *info)
unsigned	lodepng_palette_add (LodePNGColorMode *info, unsigned char r, unsigned char g, unsigned char b, unsigned char a)
unsigned	lodepng_get_bpp (const LodePNGColorMode *info)
unsigned	lodepng_get_channels (const LodePNGColorMode *info)
unsigned	lodepng_is_greyscale_type (const LodePNGColorMode *info)
unsigned	lodepng_is_alpha_type (const LodePNGColorMode *info)
unsigned	lodepng_is_palette_type (const LodePNGColorMode *info)
unsigned	lodepng_has_palette_alpha (const LodePNGColorMode *info)
unsigned	lodepng_can_have_alpha (const LodePNGColorMode *info)
size_t	lodepng_get_raw_size (unsigned w, unsigned h, const LodePNGColorMode *color)
size_t	lodepng_get_raw_size_lct (unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth)
void	lodepng_clear_text (LodePNGInfo *info)
unsigned	lodepng_add_text (LodePNGInfo *info, const char *key, const char *str)
void	lodepng_clear_itext (LodePNGInfo *info)
unsigned	lodepng_add_itext (LodePNGInfo *info, const char *key, const char *langtag, const char *transkey, const char *str)
void	lodepng_info_init (LodePNGInfo *info)
void	lodepng_info_cleanup (LodePNGInfo *info)
unsigned	lodepng_info_copy (LodePNGInfo *dest, const LodePNGInfo *source)
void	lodepng_info_swap (LodePNGInfo *a, LodePNGInfo *b)
unsigned	lodepng_convert (unsigned char *out, const unsigned char *in, const LodePNGColorMode *mode_out, const LodePNGColorMode *mode_in, unsigned w, unsigned h)
void	lodepng_color_profile_init (LodePNGColorProfile *profile)
unsigned	lodepng_get_color_profile (LodePNGColorProfile *profile, const unsigned char *in, unsigned w, unsigned h, const LodePNGColorMode *mode)
unsigned	lodepng_auto_choose_color (LodePNGColorMode *mode_out, const unsigned char *image, unsigned w, unsigned h, const LodePNGColorMode *mode_in)
unsigned	lodepng_inspect (unsigned *w, unsigned *h, LodePNGState *state, const unsigned char *in, size_t insize)
unsigned	lodepng_decode (unsigned char **out, unsigned *w, unsigned *h, LodePNGState *state, const unsigned char *in, size_t insize)
unsigned	lodepng_decode_memory (unsigned char **out, unsigned *w, unsigned *h, const unsigned char *in, size_t insize, LodePNGColorType colortype, unsigned bitdepth)
unsigned	lodepng_decode32 (unsigned char **out, unsigned *w, unsigned *h, const unsigned char *in, size_t insize)
unsigned	lodepng_decode24 (unsigned char **out, unsigned *w, unsigned *h, const unsigned char *in, size_t insize)
unsigned	lodepng_decode_file (unsigned char **out, unsigned *w, unsigned *h, const char *filename, LodePNGColorType colortype, unsigned bitdepth)
unsigned	lodepng_decode32_file (unsigned char **out, unsigned *w, unsigned *h, const char *filename)
unsigned	lodepng_decode24_file (unsigned char **out, unsigned *w, unsigned *h, const char *filename)
void	lodepng_decoder_settings_init (LodePNGDecoderSettings *settings)
void	lodepng_state_init (LodePNGState *state)
void	lodepng_state_cleanup (LodePNGState *state)
void	lodepng_state_copy (LodePNGState *dest, const LodePNGState *source)
unsigned	lodepng_encode (unsigned char **out, size_t *outsize, const unsigned char *image, unsigned w, unsigned h, LodePNGState *state)
unsigned	lodepng_encode_memory (unsigned char **out, size_t *outsize, const unsigned char *image, unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth)
unsigned	lodepng_encode32 (unsigned char **out, size_t *outsize, const unsigned char *image, unsigned w, unsigned h)
unsigned	lodepng_encode24 (unsigned char **out, size_t *outsize, const unsigned char *image, unsigned w, unsigned h)
unsigned	lodepng_encode_file (const char *filename, const unsigned char *image, unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth)
unsigned	lodepng_encode32_file (const char *filename, const unsigned char *image, unsigned w, unsigned h)
unsigned	lodepng_encode24_file (const char *filename, const unsigned char *image, unsigned w, unsigned h)
void	lodepng_encoder_settings_init (LodePNGEncoderSettings *settings)
const char *	lodepng_error_text (unsigned code)

Variables
const char *	LODEPNG_VERSION_STRING = "20170917"
const LodePNGCompressSettings	lodepng_default_compress_settings = {2, 1, 2048 , 3, 128, 1, 0, 0, 0}
const LodePNGDecompressSettings	lodepng_default_decompress_settings = {0, 0, 0, 0}

Macro Definition Documentation

#define addBitToStream	(		bitpointer,
			bitstream,
			bit
	)

Value:

{\
  /*add a new byte at the end*/\
  if(((*bitpointer) & 7) == 0) ucvector_push_back(bitstream, (unsigned char)0);\
  /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/\
  (bitstream->data[bitstream->size - 1]) |= (bit << ((*bitpointer) & 0x7));\
  ++(*bitpointer);\
}

#define CERROR_BREAK	(		errorvar,
			code
	)

Value:

{\
  errorvar = code;\
  break;\
}

#define CERROR_RETURN	(		errorvar,
			code
	)

Value:

{\
  errorvar = code;\
  return;\
}

#define CERROR_RETURN_ERROR	(		errorvar,
			code
	)

Value:

{\
  errorvar = code;\
  return code;\
}

#define CERROR_TRY_RETURN

(

call

)

Value:

{\
  unsigned error = call;\
  if(error) return error;\
}

#define DEFAULT_WINDOWSIZE   2048

#define ERROR_BREAK

(

code

)

CERROR_BREAK(error, code)

#define FIRST_LENGTH_CODE_INDEX   257

#define LAST_LENGTH_CODE_INDEX   285

#define NUM_CODE_LENGTH_CODES   19

#define NUM_DEFLATE_CODE_SYMBOLS   288

#define NUM_DISTANCE_SYMBOLS   32

#define READBIT	(		bitpointer,
			bitstream
	)		((bitstream[bitpointer >> 3] >> (bitpointer & 0x7)) & (unsigned char)1)

Typedef Documentation

typedef struct BPMLists BPMLists

typedef struct BPMNode BPMNode

typedef struct ColorTree ColorTree

typedef struct Hash Hash

typedef struct HuffmanTree HuffmanTree

typedef struct ucvector ucvector

typedef struct uivector uivector

Function Documentation

unsigned lodepng_add_itext	(	LodePNGInfo *	info,
		const char *	key,
		const char *	langtag,
		const char *	transkey,
		const char *	str
	)

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unsigned lodepng_add_text	(	LodePNGInfo *	info,
		const char *	key,
		const char *	str
	)

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unsigned lodepng_auto_choose_color	(	LodePNGColorMode *	mode_out,
		const unsigned char *	image,
		unsigned	w,
		unsigned	h,
		const LodePNGColorMode *	mode_in
	)

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unsigned lodepng_can_have_alpha

(

const LodePNGColorMode *

info

)

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unsigned char lodepng_chunk_ancillary

(

const unsigned char *

chunk

)

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unsigned lodepng_chunk_append	(	unsigned char **	out,
		size_t *	outlength,
		const unsigned char *	chunk
	)

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unsigned lodepng_chunk_check_crc

(

const unsigned char *

chunk

)

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unsigned lodepng_chunk_create	(	unsigned char **	out,
		size_t *	outlength,
		unsigned	length,
		const char *	type,
		const unsigned char *	data
	)

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unsigned char* lodepng_chunk_data

(

unsigned char *

chunk

)

const unsigned char* lodepng_chunk_data_const

(

const unsigned char *

chunk

)

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void lodepng_chunk_generate_crc

(

unsigned char *

chunk

)

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unsigned lodepng_chunk_length

(

const unsigned char *

chunk

)

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unsigned char* lodepng_chunk_next

(

unsigned char *

chunk

)

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const unsigned char* lodepng_chunk_next_const

(

const unsigned char *

chunk

)

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unsigned char lodepng_chunk_private

(

const unsigned char *

chunk

)

unsigned char lodepng_chunk_safetocopy

(

const unsigned char *

chunk

)

void lodepng_chunk_type	(	char	type[5],
		const unsigned char *	chunk
	)

unsigned char lodepng_chunk_type_equals	(	const unsigned char *	chunk,
		const char *	type
	)

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void lodepng_clear_itext

(

LodePNGInfo *

info

)

void lodepng_clear_text

(

LodePNGInfo *

info

)

void lodepng_color_mode_cleanup

(

LodePNGColorMode *

info

)

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unsigned lodepng_color_mode_copy	(	LodePNGColorMode *	dest,
		const LodePNGColorMode *	source
	)

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void lodepng_color_mode_init

(

LodePNGColorMode *

info

)

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void lodepng_color_profile_init

(

LodePNGColorProfile *

profile

)

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void lodepng_compress_settings_init

(

LodePNGCompressSettings *

settings

)

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unsigned lodepng_convert	(	unsigned char *	out,
		const unsigned char *	in,
		const LodePNGColorMode *	mode_out,
		const LodePNGColorMode *	mode_in,
		unsigned	w,
		unsigned	h
	)

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unsigned lodepng_crc32	(	const unsigned char *	data,
		size_t	length
	)

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unsigned lodepng_decode	(	unsigned char **	out,
		unsigned *	w,
		unsigned *	h,
		LodePNGState *	state,
		const unsigned char *	in,
		size_t	insize
	)

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unsigned lodepng_decode24	(	unsigned char **	out,
		unsigned *	w,
		unsigned *	h,
		const unsigned char *	in,
		size_t	insize
	)

unsigned lodepng_decode24_file	(	unsigned char **	out,
		unsigned *	w,
		unsigned *	h,
		const char *	filename
	)

unsigned lodepng_decode32	(	unsigned char **	out,
		unsigned *	w,
		unsigned *	h,
		const unsigned char *	in,
		size_t	insize
	)

unsigned lodepng_decode32_file	(	unsigned char **	out,
		unsigned *	w,
		unsigned *	h,
		const char *	filename
	)

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unsigned lodepng_decode_file	(	unsigned char **	out,
		unsigned *	w,
		unsigned *	h,
		const char *	filename,
		LodePNGColorType	colortype,
		unsigned	bitdepth
	)

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unsigned lodepng_decode_memory	(	unsigned char **	out,
		unsigned *	w,
		unsigned *	h,
		const unsigned char *	in,
		size_t	insize,
		LodePNGColorType	colortype,
		unsigned	bitdepth
	)

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void lodepng_decoder_settings_init

(

LodePNGDecoderSettings *

settings

)

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void lodepng_decompress_settings_init

(

LodePNGDecompressSettings *

settings

)

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unsigned lodepng_deflate	(	unsigned char **	out,
		size_t *	outsize,
		const unsigned char *	in,
		size_t	insize,
		const LodePNGCompressSettings *	settings
	)

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unsigned lodepng_encode	(	unsigned char **	out,
		size_t *	outsize,
		const unsigned char *	image,
		unsigned	w,
		unsigned	h,
		LodePNGState *	state
	)

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unsigned lodepng_encode24	(	unsigned char **	out,
		size_t *	outsize,
		const unsigned char *	image,
		unsigned	w,
		unsigned	h
	)

unsigned lodepng_encode24_file	(	const char *	filename,
		const unsigned char *	image,
		unsigned	w,
		unsigned	h
	)

unsigned lodepng_encode32	(	unsigned char **	out,
		size_t *	outsize,
		const unsigned char *	image,
		unsigned	w,
		unsigned	h
	)

unsigned lodepng_encode32_file	(	const char *	filename,
		const unsigned char *	image,
		unsigned	w,
		unsigned	h
	)

unsigned lodepng_encode_file	(	const char *	filename,
		const unsigned char *	image,
		unsigned	w,
		unsigned	h,
		LodePNGColorType	colortype,
		unsigned	bitdepth
	)

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unsigned lodepng_encode_memory	(	unsigned char **	out,
		size_t *	outsize,
		const unsigned char *	image,
		unsigned	w,
		unsigned	h,
		LodePNGColorType	colortype,
		unsigned	bitdepth
	)

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void lodepng_encoder_settings_init

(

LodePNGEncoderSettings *

settings

)

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const char* lodepng_error_text

(

unsigned

code

)

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unsigned lodepng_get_bpp

(

const LodePNGColorMode *

info

)

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unsigned lodepng_get_channels

(

const LodePNGColorMode *

info

)

unsigned lodepng_get_color_profile	(	LodePNGColorProfile *	profile,
		const unsigned char *	in,
		unsigned	w,
		unsigned	h,
		const LodePNGColorMode *	mode
	)

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size_t lodepng_get_raw_size	(	unsigned	w,
		unsigned	h,
		const LodePNGColorMode *	color
	)

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size_t lodepng_get_raw_size_lct	(	unsigned	w,
		unsigned	h,
		LodePNGColorType	colortype,
		unsigned	bitdepth
	)

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unsigned lodepng_has_palette_alpha

(

const LodePNGColorMode *

info

)

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unsigned lodepng_huffman_code_lengths	(	unsigned *	lengths,
		const unsigned *	frequencies,
		size_t	numcodes,
		unsigned	maxbitlen
	)

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unsigned lodepng_inflate	(	unsigned char **	out,
		size_t *	outsize,
		const unsigned char *	in,
		size_t	insize,
		const LodePNGDecompressSettings *	settings
	)

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void lodepng_info_cleanup

(

LodePNGInfo *

info

)

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unsigned lodepng_info_copy	(	LodePNGInfo *	dest,
		const LodePNGInfo *	source
	)

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void lodepng_info_init

(

LodePNGInfo *

info

)

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void lodepng_info_swap	(	LodePNGInfo *	a,
		LodePNGInfo *	b
	)

unsigned lodepng_inspect	(	unsigned *	w,
		unsigned *	h,
		LodePNGState *	state,
		const unsigned char *	in,
		size_t	insize
	)

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unsigned lodepng_is_alpha_type

(

const LodePNGColorMode *

info

)

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unsigned lodepng_is_greyscale_type

(

const LodePNGColorMode *

info

)

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unsigned lodepng_is_palette_type

(

const LodePNGColorMode *

info

)

unsigned lodepng_load_file	(	unsigned char **	out,
		size_t *	outsize,
		const char *	filename
	)

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unsigned lodepng_palette_add	(	LodePNGColorMode *	info,
		unsigned char	r,
		unsigned char	g,
		unsigned char	b,
		unsigned char	a
	)

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void lodepng_palette_clear

(

LodePNGColorMode *

info

)

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unsigned lodepng_read32bitInt

(

const unsigned char *

buffer

)

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unsigned lodepng_save_file	(	const unsigned char *	buffer,
		size_t	buffersize,
		const char *	filename
	)

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void lodepng_state_cleanup

(

LodePNGState *

state

)

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void lodepng_state_copy	(	LodePNGState *	dest,
		const LodePNGState *	source
	)

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void lodepng_state_init

(

LodePNGState *

state

)

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unsigned lodepng_zlib_compress	(	unsigned char **	out,
		size_t *	outsize,
		const unsigned char *	in,
		size_t	insize,
		const LodePNGCompressSettings *	settings
	)

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unsigned lodepng_zlib_decompress	(	unsigned char **	out,
		size_t *	outsize,
		const unsigned char *	in,
		size_t	insize,
		const LodePNGDecompressSettings *	settings
	)

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Variable Documentation

const LodePNGCompressSettings lodepng_default_compress_settings = {2, 1, 2048 , 3, 128, 1, 0, 0, 0}

const LodePNGDecompressSettings lodepng_default_decompress_settings = {0, 0, 0, 0}

const char* LODEPNG_VERSION_STRING = "20170917"