f09e17c3c5
- remove obsolete svn '$Id$' tags from all source files - update .fl files and generated files accordingly - replace 'http://www.fltk.org' URL's with 'https://...' - replace bug report URL 'str.php' with 'bugs.php' - remove trailing whitespace - fix other whitespace errors flagged by Git - add and/or fix missing or wrong standard headers - convert tabs to spaces in all source files The only relevant code changes are in the fluid/ folder where some .fl files and other source files were used to generate the '$Id' headers and footers.
91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
//
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// X overlay support for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2018 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// https://www.fltk.org/COPYING.php
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//
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// Please see the following page on how to report bugs and issues:
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//
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// https://www.fltk.org/bugs.php
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//
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// Return an overlay visual, if any. Also allocate a colormap and
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// record the depth for fl_color() to use.
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// Another disgusting X interface, based on code extracted and
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// purified with great difficulty from XLayerUtil.cxx:
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#include <config.h>
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#if HAVE_OVERLAY
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#include <FL/Fl.H>
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#include <FL/platform.H>
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// SERVER_OVERLAY_VISUALS property element:
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struct OverlayInfo {
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long overlay_visual;
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long transparent_type;
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long value;
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long layer;
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};
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extern Colormap fl_overlay_colormap;
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extern XVisualInfo* fl_overlay_visual;
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extern ulong fl_transparent_pixel;
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XVisualInfo *fl_find_overlay_visual() {
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static char beenhere;
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if (beenhere) return fl_overlay_visual;
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beenhere = 1;
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fl_open_display();
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Atom overlayVisualsAtom =
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XInternAtom(fl_display,"SERVER_OVERLAY_VISUALS",1);
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if (!overlayVisualsAtom) return 0;
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OverlayInfo *overlayInfo;
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ulong sizeData, bytesLeft;
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Atom actualType;
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int actualFormat;
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if (XGetWindowProperty(fl_display, RootWindow(fl_display, fl_screen),
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overlayVisualsAtom, 0L, 10000L, False,
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overlayVisualsAtom, &actualType, &actualFormat,
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&sizeData, &bytesLeft,
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(unsigned char **) &overlayInfo)) return 0;
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if (actualType == overlayVisualsAtom && actualFormat == 32) {
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int n = int(sizeData/4);
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XVisualInfo* v = 0;
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// find the greatest depth that has a transparent pixel:
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for (int i = 0; i < n; i++) {
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if (overlayInfo[i].transparent_type != 1) continue;
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if (overlayInfo[i].layer <= 0) continue;
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XVisualInfo templt;
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templt.visualid = overlayInfo[i].overlay_visual;
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int num;
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XVisualInfo *v1=XGetVisualInfo(fl_display, VisualIDMask, &templt, &num);
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if (v1->screen == fl_screen && v1->c_class == PseudoColor
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&& (!v || v1->depth > v->depth && v1->depth <= 8)) {
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if (v) XFree((char*)v);
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v = v1;
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fl_transparent_pixel = overlayInfo[i].value;
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} else {
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XFree((char*)v1);
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}
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}
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if (v) {
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fl_overlay_visual = v;
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fl_overlay_colormap =
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XCreateColormap(fl_display, RootWindow(fl_display, fl_screen),
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v->visual, AllocNone);
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}
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}
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XFree((char*)overlayInfo);
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//printf("overlay visual %ld selected\n", fl_overlay_visual->visualid);
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return fl_overlay_visual;
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}
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#endif
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