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163
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1 /* ----------------------------------------------------------------------------
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2 * Double buffering code
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3 * ----------------------------------------------------------------------------
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4 */
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5
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6 #include <stdio.h>
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7 #include <X11/Xlib.h>
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8
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9 #define DBL_MAX_SURFACES 2
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10 #define DBL_MIN_PLANES 2
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11 #define DBL_MAX_PLANES 6
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12 #define DBL_MAX_COLORS (1 << (DBL_MAX_PLANES >> 1))
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13
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14 typedef struct _surface {
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15 int mask; /* mask to use this surface */
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16 int offset; /* offset within colormap */
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17 int num_colors; /* number of colors in color array */
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18 XColor color[1]; /* the actual color array */
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19 } Surface;
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20
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21 typedef struct _doublebuffer {
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22 Display *display; /* X display for windows and pixmaps */
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23 Screen *screen; /* X screen */
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24 Window window; /* X window for this double buffer */
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25
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26 int width; /* width of window */
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27 int height; /* height of window */
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28
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29 Pixmap frame; /* pixmap for frame buffer */
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30 Pixmap backing; /* pixmap for backing store */
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31 Drawable drawable; /* copy of window/pixmap we draw in */
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32
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33 GC gc; /* GC used to draw the drawable */
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34 Visual *visual; /* X visual */
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35 Colormap colormap; /* X colormap identifier */
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36 int depth; /* depth of screen in planes */
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37 int num_planes; /* number of planes used */
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38
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39 /* surface information is used to do double buffering */
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40
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41 int num_surfaces;
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42 int current_surface;
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43 Surface *surface[DBL_MAX_SURFACES];
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44
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45 /* we need to remember which pixels and planes we allocated */
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46
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47 int mask;
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48 long pixels[DBL_MAX_COLORS];
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49 long planes[DBL_MAX_PLANES];
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50
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51 /* the pixel values one should use when drawing to the viewports */
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52
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53 int num_colors;
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54 int colors[DBL_MAX_COLORS];
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55 } DoubleBuffer;
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56
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57
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58 extern DoubleBuffer *DBLcreate_double_buffer();
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59 extern void DBLdelete_double_buffer();
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60 extern unsigned long DBLinq_background();
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61 extern char *getenv();
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62
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63
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64
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65
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66
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