cgit.sxemacs.org Git - packages/blob - xemacs-packages/oo-browser/tree-x/dbl.h

   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    unsigned long pixels[DBL_MAX_COLORS];
  49    unsigned 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 void            DBLend_frame(DoubleBuffer *db, short init);
  59 void            DBLbegin_frame (DoubleBuffer *db);
  60 void            DBLdelete_double_buffer(DoubleBuffer *db);
  61 unsigned long   DBLinq_background(DoubleBuffer *db);
  62
  63 DoubleBuffer *
  64 DBLcreate_double_buffer (Display *display,
  65                          Window   window,
  66                          int      backing_store,
  67                          XColor  *colors,
  68                          int      num_colors);