pngz.h

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/* pngz.h
 * samantha jane
 * easy png
 *--------------------------------------------------------------------------80*/
 
#ifndef _PNGZ_H_
#define _PNGZ_H_
 
#include <png.h>
/**
 * pixel in RGBA8 format.
 */
typedef struct pixel {
  /** channel values */
  unsigned char r, g, b, a;
} pixel;
 
/**
 * easy png structure.
 * always contains RGBA8 color (0x0 - 0xFFFFFF).
 * pixel buffer is [height][width] pixels ([rows][cols])
 */
typedef struct pngz {
  /** default path to load from and save to */
  char* path;
  /** union alias for either height or rows */
  union { 
    unsigned height;
    unsigned rows;
  };
  /** union alias for either width or cols */
  union {
    unsigned width;
    unsigned cols;
  };
  /** [height][width] pixel buffer */
  pixel** pixels;
} pngz;
 
/* prototypes */
 
/* allocate & free */
pixel** pngz_alloc_pixels(unsigned rows, unsigned cols);
unsigned char** pngz_alloc_bytes(unsigned rows, unsigned cols);
int pngz_free_pixels(pixel** pixels, unsigned rows);
int pngz_free_bytes(unsigned char** bytes, unsigned rows);
int pngz_free(pngz* z);
 
/* load and save */
int pngz_pack_pixels(
  unsigned char** bytes_src, pixel** pixels_dest,
  unsigned rows, unsigned cols
);
int pngz_unpack_pixels(
  pixel** pixels_src, unsigned char** bytes_dest,
  unsigned rows, unsigned cols
);
int pngz_load(pngz* z);
int pngz_load_from(pngz* z, char* path);
int pngz_save(pngz z);
int pngz_save_as(pngz z, char* path);
 
/* print */
void pngz_print(pngz z);
void pngz_print_pixel(pixel p);
void pngz_print_indent(pngz z, int indent);
void pngz_print_pixel_indent(pixel p, int indent);
 
#endif