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C/C++ Source or Header  |  1998-04-12  |  2KB  |  61 lines
  1. #include "allincludes.h"
  2.  
  3. #ifdef BUFFERING
  4. /* clears the buffer [BDyess] */
  5. void
  6. W_ClearBuffer(window)
  7.     W_Window window;
  8. {
  9.   struct window * win = W_Void2Window(window);
  10.  
  11.   if(!win->isbuffered) return;
  12.   XFillRectangle(W_Display, win->drawable, colortable[backColor].contexts[0],
  13.          0, 0, win->width, win->height);
  14. }
  15.  
  16. int
  17. W_IsBuffered(window)
  18.     W_Window window;
  19. {
  20.   return W_Void2Window(window)->isbuffered;
  21. }
  22.  
  23. /* turns on buffering, reduces flicker [BDyess] */
  24. /* on is a flag: 1 turns on buffering, 0 turns it off */
  25. void
  26. W_Buffer(window, on)
  27.     W_Window window;
  28.     int on;
  29. {
  30.   struct window * win = W_Void2Window(window);
  31.  
  32.   if(on) {    /* turn buffering on [BDyess] */
  33.     win->isbuffered = 1;
  34.     if(win->buffer == 0) {  /* create a new pixmap for the buffer [BDyess] */
  35.       win->buffer = XCreatePixmap(W_Display, W_Root, win->width,
  36.                 win->height, 
  37.                 (unsigned)DefaultDepth(W_Display, W_Screen));
  38.     }
  39.     win->drawable = win->buffer;
  40.     /* clear the buffer to start with (can contain garbage) [BDyess] */
  41.     W_ClearBuffer(window);
  42.   } else { /* turn it off [BDyess] */
  43.     win->drawable = win->window;
  44.     win->isbuffered = 0;
  45.   }
  46. }
  47.  
  48. /* draws the buffer onto the screen [BDyess] */
  49. void
  50. W_DisplayBuffer(window)
  51.     W_Window window;
  52. {
  53.   struct window * win = W_Void2Window(window);
  54.  
  55.   if(!win->isbuffered) return;
  56.   XCopyArea(W_Display, win->buffer, win->window, 
  57.             colortable[W_Black].contexts[0], 0, 0, win->width, 
  58.         win->height, 0, 0);
  59. }
  60. #endif /*BUFFERING [BDyess]*/
  61.