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42
43#ifndef _RGBE_HDR_H_
44#define _RGBE_HDR_H_
45
46// posted to http://www.graphics.cornell.edu/~bjw/
47// written by Bruce Walter (bjw@graphics.cornell.edu) 5/26/95
48// based on code written by Greg Ward
49
50#include <stdio.h>
51
52typedef struct {
53 int valid; /* indicate which fields are valid */
54 char programtype[16]; /* listed at beginning of file to identify it
55 * after "#?". defaults to "RGBE" */
56 float gamma; /* image has already been gamma corrected with
57 * given gamma. defaults to 1.0 (no correction) */
58 float exposure; /* a value of 1.0 in an image corresponds to
59 * <exposure> watts/steradian/m^2.
60 * defaults to 1.0 */
61} rgbe_header_info;
62
63/* flags indicating which fields in an rgbe_header_info are valid */
64#define RGBE_VALID_PROGRAMTYPE 0x01
65#define RGBE_VALID_GAMMA 0x02
66#define RGBE_VALID_EXPOSURE 0x04
67
68/* return codes for rgbe routines */
69#define RGBE_RETURN_SUCCESS 0
70#define RGBE_RETURN_FAILURE -1
71
72/* read or write headers */
73/* you may set rgbe_header_info to null if you want to */
74int RGBE_WriteHeader(FILE *fp, int width, int height, rgbe_header_info *info);
75int RGBE_ReadHeader(FILE *fp, int *width, int *height, rgbe_header_info *info);
76
77/* read or write pixels */
78/* can read or write pixels in chunks of any size including single pixels*/
79int RGBE_WritePixels(FILE *fp, float *data, int numpixels);
80int RGBE_ReadPixels(FILE *fp, float *data, int numpixels);
81
82/* read or write run length encoded files */
83/* must be called to read or write whole scanlines */
84int RGBE_WritePixels_RLE(FILE *fp, float *data, int scanline_width,
85 int num_scanlines);
86int RGBE_ReadPixels_RLE(FILE *fp, float *data, int scanline_width,
87 int num_scanlines);
88
89#endif/*_RGBE_HDR_H_*/
90

source code of opencv/modules/imgcodecs/src/rgbe.hpp