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