www.pudn.com > RNL.rar > rgbe.h

#ifndef _H_RGBE 
#define _H_RGBE 
/* THIS CODE CARRIES NO GUARANTEE OF USABILITY OR FITNESS FOR ANY PURPOSE. 
 * WHILE THE AUTHORS HAVE TRIED TO ENSURE THE PROGRAM WORKS CORRECTLY, 
 * IT IS STRICTLY USE AT YOUR OWN RISK.  */ 
 
/* utility for reading and writing Ward's rgbe image format. 
   See rgbe.txt file for more details. 
*/ 
 
#include  
 
typedef struct { 
  int valid;            /* indicate which fields are valid */ 
  char programtype[16]; /* listed at beginning of file to identify it 
                         * after "#?".  defaults to "RGBE" */ 
  float gamma;          /* image has already been gamma corrected with 
                         * given gamma.  defaults to 1.0 (no correction) */ 
  float exposure;       /* a value of 1.0 in an image corresponds to 
			 *  watts/steradian/m^2. 
			 * defaults to 1.0 */ 
} rgbe_header_info; 
 
/* flags indicating which fields in an rgbe_header_info are valid */ 
#define RGBE_VALID_PROGRAMTYPE 0x01 
#define RGBE_VALID_GAMMA       0x02 
#define RGBE_VALID_EXPOSURE    0x04 
 
/* return codes for rgbe routines */ 
#define RGBE_RETURN_SUCCESS 0 
#define RGBE_RETURN_FAILURE -1 
 
/* read or write headers */ 
/* you may set rgbe_header_info to null if you want to */ 
int RGBE_WriteHeader(FILE *fp, int width, int height, rgbe_header_info *info); 
int RGBE_ReadHeader(FILE *fp, int *width, int *height, rgbe_header_info *info); 
 
/* read or write pixels */ 
/* can read or write pixels in chunks of any size including single pixels*/ 
int RGBE_WritePixels(FILE *fp, float *data, int numpixels); 
int RGBE_ReadPixels(FILE *fp, float *data, int numpixels); 
 
/* read or write run length encoded files */ 
/* must be called to read or write whole scanlines */ 
int RGBE_WritePixels_RLE(FILE *fp, float *data, int scanline_width, 
			 int num_scanlines); 
int RGBE_ReadPixels_RLE(FILE *fp, float *data, int scanline_width, 
			int num_scanlines); 
 
 
// stores pixels in rgbe format 
int RGBE_ReadPixels_RLE_Components(FILE *fp, unsigned char *data, int scanline_width, 
			int num_scanlines); 
 
#endif /* _H_RGBE */