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// Stupid X tricks
// Return an overlay visual, if any. Also allocate a colormap and
// record the depth for fl_color() to use.
// Another disgusting X interface, based on code extracted and
// purified with great difficulty from XLayerUtil.C:
#include <config.h>
#if HAVE_OVERLAY
#include <FL/Fl.H>
#include <FL/x.H>
// SERVER_OVERLAY_VISUALS property element:
struct OverlayInfo {
long overlay_visual;
long transparent_type;
long value;
long layer;
};
extern Colormap fl_overlay_colormap;
extern XVisualInfo* fl_overlay_visual;
extern ulong fl_transparent_pixel;
XVisualInfo *fl_find_overlay_visual() {
static char beenhere;
if (beenhere) return fl_overlay_visual;
beenhere = 1;
fl_open_display();
Atom overlayVisualsAtom =
XInternAtom(fl_display,"SERVER_OVERLAY_VISUALS",1);
if (!overlayVisualsAtom) return 0;
OverlayInfo *overlayInfo;
ulong sizeData, bytesLeft;
Atom actualType;
int actualFormat;
if (XGetWindowProperty(fl_display, RootWindow(fl_display, fl_screen),
overlayVisualsAtom, 0L, 10000L, False,
overlayVisualsAtom, &actualType, &actualFormat,
&sizeData, &bytesLeft,
(unsigned char **) &overlayInfo)) return 0;
if (actualType == overlayVisualsAtom && actualFormat == 32) {
int n = int(sizeData/4);
XVisualInfo* v = 0;
// find the greatest depth that has a transparent pixel:
for (int i = 0; i < n; i++) {
if (overlayInfo[i].transparent_type != 1) continue;
if (overlayInfo[i].layer <= 0) continue;
XVisualInfo templt;
templt.visualid = overlayInfo[i].overlay_visual;
int num;
XVisualInfo *v1=XGetVisualInfo(fl_display, VisualIDMask, &templt, &num);
if (v1->screen == fl_screen &&
!v1->red_mask && (!v || v1->depth >= v->depth && v1->depth <= 8)) {
if (v) XFree((char*)v);
v = v1;
fl_transparent_pixel = overlayInfo[i].value;
} else {
XFree((char*)v1);
}
}
if (v) {
fl_overlay_visual = v;
fl_overlay_colormap =
XCreateColormap(fl_display, RootWindow(fl_display, fl_screen),
v->visual, AllocNone);
}
}
XFree((char*)overlayInfo);
// printf("overlay visual %d selected\n", fl_overlay_visual->visualid);
return fl_overlay_visual;
}
#endif
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