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#ifndef PNGX_H_INCLUDED
#define PNGX_H_INCLUDED
#include <stdbool.h>
#include <png.h>
/* This includes the Zlib interface header file zlib.h because libpng uses
libz and some of the Zlib interface, e.g. the Z_DEFLATED constant,
is part of the libpng interface.
*/
#include "pm_c_util.h"
/* pngx is designed to be an extension of the PNG library to make using
the PNG library easier and cleaner.
*/
struct pngx_chroma {
float wx;
float wy;
float rx;
float ry;
float gx;
float gy;
float bx;
float by;
};
struct pngx_phys {
int x;
int y;
int unit;
};
struct pngx_text {
png_text * line;
unsigned int size;
};
struct pngx_plte {
png_color * palette;
unsigned int size;
};
struct pngx_trns {
png_byte * trans;
unsigned int numTrans;
png_color_16 transColor;
};
typedef enum {PNGX_READ, PNGX_WRITE} pngx_rw;
struct pngx {
png_structp png_ptr;
png_infop info_ptr;
pngx_rw rw;
png_uint_16 maxval;
unsigned int numPassesRequired;
/* The number of times we have to write the complete image to the
compressor. This is more than one when the compressor is set
up to do an interlaced format.
*/
bool infoPrepared;
/* png_write_info or png_read_info has been called, so libpng is in a
state in which things such as png_set_interlace_handling will work.
These functions use information in *png_ptr that is set by
png_XXX_info.
*/
};
void
pngx_create(struct pngx ** const pngxPP,
pngx_rw const rw,
jmp_buf * const jmpbufP);
void
pngx_destroy(struct pngx * const pngxP);
bool
pngx_chunkIsPresent(struct pngx * const pngxP,
uint32_t const chunkType);
unsigned int
pngx_bitDepth(struct pngx * const pngxP);
png_color_16
pngx_bkgd(struct pngx * const pngxP);
png_byte
pngx_colorType(struct pngx * const pngxP);
png_byte
pngx_filterType(struct pngx * const pngxP);
double
pngx_gama(struct pngx * const pngxP);
uint32_t
pngx_imageHeight(struct pngx * const pngxP);
uint32_t
pngx_imageWidth(struct pngx * const pngxP);
png_byte
pngx_interlaceType(struct pngx * const pngxP);
struct pngx_plte
pngx_plte(struct pngx * const pngxP);
png_color_8
pngx_sbit(struct pngx * const pngxP);
struct pngx_text
pngx_text(struct pngx * const pngxP);
png_time
pngx_time(struct pngx * const pngxP);
struct pngx_trns
pngx_trns(struct pngx * const pngxP);
uint32_t
pngx_xPixelsPerMeter(struct pngx * const pngxP);
uint32_t
pngx_yPixelsPerMeter(struct pngx * const pngxP);
float
pngx_pixelAspectRatio(struct pngx * const pngxP);
bool
pngx_pixelAspectRatioIsKnown(struct pngx * const pngxP);
void
pngx_removeChunk(struct pngx * const pngxP,
uint32_t const chunkType);
void
pngx_setBkgdPalette(struct pngx * const pngxP,
unsigned int const backgroundIndex);
void
pngx_setBkgdRgb(struct pngx * const pngxP,
png_color_16 const backgroundArg);
void
pngx_setChrm(struct pngx * const pngxP,
struct pngx_chroma const chroma);
typedef enum {
PNGX_PERCEPTUAL,
PNGX_RELATIVE_COLORIMETRIC,
PNGX_SATURATION,
PNGX_ABSOLUTE_COLORIMETRIC
} pngx_srgbIntent;
const char *
pngx_srgbIntentDesc(pngx_srgbIntent const srgbIntent);
void
pngx_setSrgb(struct pngx * const pngxP,
pngx_srgbIntent const srgbIntent);
void
pngx_setCompressionSize(struct pngx * const pngxP,
unsigned int const bufferSize);
void
pngx_setFilter(struct pngx * const pngxP,
int const filterSet);
void
pngx_setGama(struct pngx * const pngxP,
float const fileGamma);
void
pngx_setGamma(struct pngx * const pngxP,
float const displayGamma,
float const imageGamma);
void
pngx_setHist(struct pngx * const pngxP,
png_uint_16 * const histogram);
void
pngx_setIhdr(struct pngx * const pngxP,
unsigned int const width,
unsigned int const height,
unsigned int const bitDepth,
int const colorType,
int const interlaceMethod,
int const compressionMethod,
int const filterMethod);
void
pngx_setInterlaceHandling(struct pngx * const pngxP);
void
pngx_setInvalid(struct pngx * const pngxP);
void
pngx_setPacking(struct pngx * const pngxP);
void
pngx_setPhys(struct pngx * const pngxP,
struct pngx_phys const phys);
void
pngx_setPlte(struct pngx * const pngxP,
png_color * const palette,
unsigned int const paletteSize);
void
pngx_setSbit(struct pngx * const pngxP,
png_color_8 const sbit);
void
pngx_setShift(struct pngx * const pngxP,
png_color_8 const sigBitArg);
void
pngx_setSigBytes(struct pngx * const pngxP,
unsigned int const sigByteCt);
void
pngx_setTextKey(png_text * const textP,
const char * const key);
void
pngx_setTextLang(png_text * const textP,
const char * const language);
void
pngx_setTextLangKey(png_text * const textP,
const char * const key);
void
pngx_termText(png_text * const textP);
void
pngx_setText(struct pngx * const pngxP,
png_textp const textP,
unsigned int const count);
void
pngx_setTime(struct pngx * const pngxP,
time_t const timeArg);
void
pngx_setTrnsPalette(struct pngx * const pngxP,
const png_byte * const transPalette,
unsigned int const paletteSize);
void
pngx_setTrnsValue(struct pngx * const pngxP,
png_color_16 const transColorArg);
void
pngx_readInfo(struct pngx * const pngxP);
void
pngx_writeInfo(struct pngx * const pngxP);
void
pngx_readStart(struct pngx * const pngxP,
FILE * const ifP);
void
pngx_readRow(struct pngx * const pngxP,
png_byte * const rowBuf,
png_byte * const displayRow);
void
pngx_readImage(struct pngx * const pngxP,
png_byte ** const image);
void
pngx_writeRow(struct pngx * const pngxP,
const png_byte * const line);
void
pngx_readEnd(struct pngx * const pngxP);
void
pngx_writeEnd(struct pngx * const pngxP);
#endif
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