116 lines
3.1 KiB
C++
116 lines
3.1 KiB
C++
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// Fl_Overlay_Window.C
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// A window using double-buffering and able to draw an overlay
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// on top of that. Uses the hardware to draw the overlay if
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// possible, otherwise it just draws in the front buffer.
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#include <config.h>
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#include <FL/Fl.H>
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#include <FL/Fl_Overlay_Window.H>
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#include <FL/fl_draw.H>
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#include <FL/x.H>
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void Fl_Overlay_Window::show() {
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Fl_Double_Window::show();
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if (overlay_ && overlay_ != this) overlay_->show();
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}
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void Fl_Overlay_Window::hide() {
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Fl_Double_Window::hide();
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}
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void Fl_Overlay_Window::flush() {
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// a non-zero argument copies entire back buffer to window, erasing
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// the overlay. We should only do this if fake overlay needs redraw:
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uchar overlay_damage = damage()&8; clear_damage(damage()&~8);
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_flush(overlay_damage);
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if (overlay_ == this) draw_overlay();
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}
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void Fl_Overlay_Window::resize(int X, int Y, int W, int H) {
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Fl_Double_Window::resize(X,Y,W,H);
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if (overlay_ && overlay_!=this) overlay_->resize(0,0,w(),h());
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}
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Fl_Overlay_Window::~Fl_Overlay_Window() {
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hide();
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// delete overlay; this is done by ~Fl_Group
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}
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#if !HAVE_OVERLAY
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int Fl_Overlay_Window::can_do_overlay() {return 0;}
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void Fl_Overlay_Window::redraw_overlay() {overlay_ = this; damage(8);}
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#else
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extern XVisualInfo *fl_find_overlay_visual();
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extern XVisualInfo *fl_overlay_visual;
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extern Colormap fl_overlay_colormap;
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extern unsigned long fl_transparent_pixel;
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static GC gc; // the GC used by all X windows
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extern uchar fl_overlay; // changes how fl_color(x) works
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class _Fl_Overlay : public Fl_Window {
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friend class Fl_Overlay_Window;
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void flush();
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void show();
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public:
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_Fl_Overlay(int x, int y, int w, int h) :
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Fl_Window(x,y,w,h) {deactivate();}
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};
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int Fl_Overlay_Window::can_do_overlay() {
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return fl_find_overlay_visual() != 0;
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}
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void _Fl_Overlay::show() {
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if (shown()) {Fl_Window::show(); return;}
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fl_background_pixel = int(fl_transparent_pixel);
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Fl_X::make_xid(this, fl_overlay_visual, fl_overlay_colormap);
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fl_background_pixel = -1;
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// find the outermost window to tell wm about the colormap:
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Fl_Window *w = window();
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for (;;) {Fl_Window *w1 = w->window(); if (!w1) break; w = w1;}
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XSetWMColormapWindows(fl_display, fl_xid(w), &(Fl_X::i(this)->xid), 1);
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}
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void _Fl_Overlay::flush() {
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fl_window = fl_xid(this);
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if (!gc) gc = XCreateGC(fl_display, fl_xid(this), 0, 0);
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fl_gc = gc;
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fl_overlay = 1;
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Fl_Overlay_Window *w = (Fl_Overlay_Window *)parent();
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Fl_X *i = Fl_X::i(this);
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if (damage() != 2) XClearWindow(fl_display, fl_xid(this));
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fl_clip_region(i->region); i->region = 0;
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w->draw_overlay();
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fl_overlay = 0;
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}
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void Fl_Overlay_Window::redraw_overlay() {
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if (!fl_display) return; // this prevents fluid -c from opening display
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if (!overlay_) {
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if (can_do_overlay()) {
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Fl_Group::current(this);
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overlay_ = new _Fl_Overlay(0,0,w(),h());
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Fl_Group::current(0);
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} else {
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overlay_ = this; // fake the overlay
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}
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}
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if (shown()) {
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if (overlay_ == this)
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damage(8);
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else if (!overlay_->shown())
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overlay_->show();
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else
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overlay_->redraw();
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}
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}
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#endif
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// End of Fl_Overlay_Window.C
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