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C/C++ Source or Header  |  1995-05-20  |  2.3 KB  |  67 lines
  1. /* ----------------------------------------------------------------------------
  2.  *     Double buffering code
  3.  * ----------------------------------------------------------------------------
  4.  */
  5.  
  6. #include <stdio.h>
  7. #include <X11/Xlib.h>
  8.  
  9. #define DBL_MAX_SURFACES 2
  10. #define DBL_MIN_PLANES   2
  11. #define DBL_MAX_PLANES   6
  12. #define DBL_MAX_COLORS   (1 << (DBL_MAX_PLANES >> 1))
  13.  
  14. typedef struct _surface {
  15.     int             mask;          /* mask to use this surface           */
  16.     int           offset;          /* offset within colormap             */
  17.     int       num_colors;          /* number of colors in color array    */
  18.     XColor   color[1];          /* the actual color array             */
  19. } Surface;
  20.  
  21. typedef struct _doublebuffer {
  22.     Display     *display;       /* X display for windows and pixmaps  */
  23.     Screen      *screen;    /* X screen                           */
  24.     Window     window;    /* X window for this double buffer    */
  25.  
  26.     int         width;        /* width of window                    */
  27.     int          height;    /* height of window                   */
  28.  
  29.     Pixmap     frame;            /* pixmap for frame buffer            */
  30.     Pixmap       backing;       /* pixmap for backing store           */
  31.     Drawable     drawable;      /* copy of window/pixmap we draw in   */
  32.  
  33.     GC         gc;        /* GC used to draw the drawable       */
  34.     Visual      *visual;    /* X visual                           */
  35.     Colormap     colormap;    /* X colormap identifier              */
  36.     int          depth;            /* depth of screen in planes          */
  37.     int          num_planes;    /* number of planes used              */
  38.  
  39. /* surface information is used to do double buffering                 */ 
  40.  
  41.    int       num_surfaces;
  42.    int       current_surface;
  43.    Surface  *surface[DBL_MAX_SURFACES];
  44.  
  45. /* we need to remember which pixels and planes we allocated           */
  46.  
  47.    int       mask;
  48.    long      pixels[DBL_MAX_COLORS];                                  
  49.    long      planes[DBL_MAX_PLANES];
  50.  
  51. /* the pixel values one should use when drawing to the viewports      */
  52.  
  53.    int       num_colors; 
  54.    int       colors[DBL_MAX_COLORS];
  55. } DoubleBuffer;
  56.  
  57.  
  58. extern DoubleBuffer  *DBLcreate_double_buffer();
  59. extern void           DBLdelete_double_buffer();
  60. extern unsigned long  DBLinq_background();
  61. extern char          *getenv();
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