progs/util/imagesgi.h

   1 /******************************************************************************
   2 ** Filename       : imageSgi.h
   3 **                  UNCLASSIFIED
   4 **
   5 ** Description    : Utility to read SGI image format files.  This code was
   6 **                  originally a SGI image loading utility provided with the
   7 **                  Mesa 3D library @ http://www.mesa3d.org by Brain Paul.
   8 **                  This has been extended to read all SGI image formats
   9 **                  (e.g. INT, INTA, RGB, RGBA).
  10 **
  11 ** Revision History:
  12 **   Date       Name   Description
  13 **   06/08/99   BRC    Initial Release
  14 **
  15 ******************************************************************************/
  16
  17 #ifndef __IMAGESGI_H
  18 #define __IMAGESGI_H
  19
  20 #define IMAGE_SGI_TYPE_VERBATIM 0
  21 #define IMAGE_SGI_TYPE_RLE      1
  22
  23 struct sImageSgiHeader          // 512 bytes
  24 {
  25   short magic;                  // IRIS image file magic number (474)
  26   char type;                    // Storage format (e.g. RLE or VERBATIM)
  27   char numBytesPerPixelChannel; // Number of bytes per pixel channel
  28   unsigned short dim;           // Number of dimensions (1 to 3)
  29   unsigned short xsize;         // Width (in pixels)
  30   unsigned short ysize;         // Height (in pixels)
  31   unsigned short zsize;         // Number of channels (1 to 4)
  32   int minimumPixelValue;        // Minimum pixel value (0 to 255)
  33   int maximumPixelValue;        // Maximum pixel value (0 to 255)
  34   char padding1[4];             // (ignored)
  35   char imageName[80];           // Image name
  36   int colormap;                 // colormap ID (0=normal, 0=dithered,
  37                                 // 2=screen, 3=colormap)
  38   char padding2[404];           // (ignored)
  39 };
  40
  41 struct sImageSgi
  42 {
  43    struct sImageSgiHeader header;
  44    unsigned char *data;
  45 };
  46
  47 #ifndef __IMAGESGI_CPP
  48
  49 // RGB image load utility
  50 extern struct sImageSgi *ImageSgiOpen(char const * const fileName);
  51 extern void ImageSgiClose(struct sImageSgi *image);
  52
  53 #endif
  54
  55 #endif /* __IMAGESGI_H */