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- //
- // "$Id: Fl_Overlay_Window.cxx,v 1.7 1999/01/07 19:17:24 mike Exp $"
- //
- // Overlay window code for the Fast Light Tool Kit (FLTK).
- //
- // Copyright 1998-1999 by Bill Spitzak and others.
- //
- // This library is free software; you can redistribute it and/or
- // modify it under the terms of the GNU Library General Public
- // License as published by the Free Software Foundation; either
- // version 2 of the License, or (at your option) any later version.
- //
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- // Library General Public License for more details.
- //
- // You should have received a copy of the GNU Library General Public
- // License along with this library; if not, write to the Free Software
- // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- // USA.
- //
- // Please report all bugs and problems to "fltk-bugs@easysw.com".
- //
-
- // A window using double-buffering and able to draw an overlay
- // on top of that. Uses the hardware to draw the overlay if
- // possible, otherwise it just draws in the front buffer.
-
- #include <config.h>
- #include <FL/Fl.H>
- #include <FL/Fl_Overlay_Window.H>
- #include <FL/fl_draw.H>
- #include <FL/x.H>
-
- void Fl_Overlay_Window::show() {
- Fl_Double_Window::show();
- if (overlay_ && overlay_ != this) overlay_->show();
- }
-
- void Fl_Overlay_Window::hide() {
- Fl_Double_Window::hide();
- }
-
- void Fl_Overlay_Window::flush() {
- int erase_overlay = (damage()&FL_DAMAGE_OVERLAY);
- clear_damage(damage()&~FL_DAMAGE_OVERLAY);
- Fl_Double_Window::flush(erase_overlay);
- if (overlay_ == this) draw_overlay();
- }
-
- void Fl_Overlay_Window::resize(int X, int Y, int W, int H) {
- Fl_Double_Window::resize(X,Y,W,H);
- if (overlay_ && overlay_!=this) overlay_->resize(0,0,w(),h());
- }
-
- Fl_Overlay_Window::~Fl_Overlay_Window() {
- hide();
- // delete overlay; this is done by ~Fl_Group
- }
-
- #if !HAVE_OVERLAY
-
- int Fl_Overlay_Window::can_do_overlay() {return 0;}
-
- void Fl_Overlay_Window::redraw_overlay() {
- overlay_ = this;
- clear_damage(damage()|FL_DAMAGE_OVERLAY);
- Fl::damage(FL_DAMAGE_CHILD);
- }
-
- #else
-
- extern XVisualInfo *fl_find_overlay_visual();
- extern XVisualInfo *fl_overlay_visual;
- extern Colormap fl_overlay_colormap;
- extern unsigned long fl_transparent_pixel;
- static GC gc; // the GC used by all X windows
- extern uchar fl_overlay; // changes how fl_color(x) works
-
- class _Fl_Overlay : public Fl_Window {
- friend class Fl_Overlay_Window;
- void flush();
- void show();
- public:
- _Fl_Overlay(int x, int y, int w, int h) :
- Fl_Window(x,y,w,h) {deactivate();}
- };
-
- int Fl_Overlay_Window::can_do_overlay() {
- return fl_find_overlay_visual() != 0;
- }
-
- void _Fl_Overlay::show() {
- if (shown()) {Fl_Window::show(); return;}
- fl_background_pixel = int(fl_transparent_pixel);
- Fl_X::make_xid(this, fl_overlay_visual, fl_overlay_colormap);
- fl_background_pixel = -1;
- // find the outermost window to tell wm about the colormap:
- Fl_Window *w = window();
- for (;;) {Fl_Window *w1 = w->window(); if (!w1) break; w = w1;}
- XSetWMColormapWindows(fl_display, fl_xid(w), &(Fl_X::i(this)->xid), 1);
- }
-
- void _Fl_Overlay::flush() {
- fl_window = fl_xid(this);
- if (!gc) gc = XCreateGC(fl_display, fl_xid(this), 0, 0);
- fl_gc = gc;
- fl_overlay = 1;
- Fl_Overlay_Window *w = (Fl_Overlay_Window *)parent();
- Fl_X *i = Fl_X::i(this);
- if (damage() != FL_DAMAGE_EXPOSE) XClearWindow(fl_display, fl_xid(this));
- fl_clip_region(i->region); i->region = 0;
- w->draw_overlay();
- fl_overlay = 0;
- }
-
- void Fl_Overlay_Window::redraw_overlay() {
- if (!fl_display) return; // this prevents fluid -c from opening display
- if (!overlay_) {
- if (can_do_overlay()) {
- Fl_Group::current(this);
- overlay_ = new _Fl_Overlay(0,0,w(),h());
- Fl_Group::current(0);
- } else {
- overlay_ = this; // fake the overlay
- }
- }
- if (shown()) {
- if (overlay_ == this) {
- clear_damage(damage()|FL_DAMAGE_OVERLAY);
- Fl::damage(FL_DAMAGE_CHILD);
- } else if (!overlay_->shown())
- overlay_->show();
- else
- overlay_->redraw();
- }
- }
-
- #endif
-
- //
- // End of "$Id: Fl_Overlay_Window.cxx,v 1.7 1999/01/07 19:17:24 mike Exp $".
- //
-