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// Fl_visual.C
//
// Set the default visual according to passed switches:
#include <config.h>
#include <FL/Fl.H>
#include <FL/x.H>
#ifdef WIN32
int Fl::visual(int flags) {
fl_GetDC(0);
if (flags & FL_DOUBLE) return 0;
if (!(flags & FL_INDEX) &&
GetDeviceCaps(fl_gc,BITSPIXEL) <= 8) return 0;
if ((flags & FL_RGB8) && GetDeviceCaps(fl_gc,BITSPIXEL)<24) return 0;
return 1;
}
#else
#if USE_XDBE
#include <X11/extensions/Xdbe.h>
#endif
static int test_visual(XVisualInfo& v, int flags) {
if (v.screen != fl_screen) return 0;
if (!(flags & FL_INDEX)) {
if (!v.red_mask) return 0; // detects static, true, and direct color
if (v.depth <= 8) return 0; // fltk will work better in colormap mode
}
if (flags & FL_RGB8) {
if (v.depth < 24) return 0;
}
// for now, fltk does not like colormaps of more than 8 bits:
if (!v.red_mask && v.depth > 8) return 0;
#if USE_XDBE
if (flags & FL_DOUBLE) {
static XdbeScreenVisualInfo *xdbejunk;
if (!xdbejunk) {
int event_base, error_base;
if (!XdbeQueryExtension(fl_display, &event_base, &error_base)) return 0;
Drawable root = RootWindow(fl_display,fl_screen);
int numscreens = 1;
xdbejunk = XdbeGetVisualInfo(fl_display,&root,&numscreens);
if (!xdbejunk) return 0;
}
for (int j = 0; ; j++) {
if (j >= xdbejunk->count) return 0;
if (xdbejunk->visinfo[j].visual == v.visualid) break;
}
}
#endif
return 1;
}
int Fl::visual(int flags) {
#if USE_XDBE == 0
if (flags & FL_DOUBLE) return 0;
#endif
fl_open_display();
// always use default if possible:
if (test_visual(*fl_visual, flags)) return 1;
// get all the visuals:
XVisualInfo vTemplate;
int num;
XVisualInfo *visualList = XGetVisualInfo(fl_display, 0, &vTemplate, &num);
// find all matches, use the one with greatest depth:
XVisualInfo *found = 0;
for (int i=0; i<num; i++) if (test_visual(visualList[i], flags)) {
if (!found || found->depth < visualList[i].depth)
found = &visualList[i];
}
if (!found) {XFree((void*)visualList); return 0;}
fl_visual = found;
fl_colormap = XCreateColormap(fl_display, RootWindow(fl_display,fl_screen),
fl_visual->visual, AllocNone);
return 1;
}
#endif
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