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rgbe.h    78 lines (60 with data), 2.6 kB

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#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. */
/* Copyright (c) 1995 Bruce Walter <bjw@graphics.cornell.edu>
The license of these files has been clarified by Bruce Walter during
a private email conversation. These files are public domain. */
/* utility for reading and writing Ward's rgbe image format.
See rgbe.txt file for more details.
*/
#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
#ifdef __cplusplus
extern "C" {
#endif
/* 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);
int RGBE_ReadPixels_Raw_RLE(FILE *fp, unsigned char *data, int scanline_width,
size_t num_scanlines);
#ifdef _CPLUSPLUS
/* define if your compiler understands inline commands */
#define INLINE inline
#else
#define INLINE
#endif
INLINE void float2rgbe(unsigned char rgbe[4], float red, float green, float blue);
INLINE void rgbe2float(float *red, float *green, float *blue, unsigned char rgbe[4]);
#ifdef __cplusplus
}
#endif
#endif /* _H_RGBE */