rgbe.hpp

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#ifndef _RGBE_HDR_H_
#define _RGBE_HDR_H_

// posted to http://www.graphics.cornell.edu/~bjw/
// written by Bruce Walter  ([email protected])  5/26/95
// based on code written by Greg Ward

#include <stdio.h>

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
       * <exposure> 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);

#endif/*_RGBE_HDR_H_*/