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// Fl_Double_Window.C
// A double-buffered window. This is achieved by using the Xdbe extension,
// or a pixmap if that is not available.
// On systems that support double buffering "naturally" the base
// Fl_Window class will probably do double-buffer and this subclass
// does nothing.
#include <config.h>
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/x.H>
#include <FL/fl_draw.H>
#if USE_XDBE
#include <X11/extensions/Xdbe.h>
static int use_xdbe;
static int can_xdbe() {
static int tried;
if (!tried) {
tried = 1;
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;
XdbeScreenVisualInfo *a = XdbeGetVisualInfo(fl_display,&root,&numscreens);
if (!a) return 0;
for (int j = 0; j < a->count; j++)
if (a->visinfo[j].visual == fl_visual->visualid
/*&& a->visinfo[j].perflevel > 0*/) {use_xdbe = 1; break;}
XdbeFreeVisualInfo(a);
}
return use_xdbe;
}
#define DAMAGE_TEST() (damage() && (use_xdbe || damage() != 2))
#else
#define DAMAGE_TEST() (damage() & ~2)
#endif
void Fl_Double_Window::show() {
#ifndef WIN32
if (!shown()) { // don't set the background pixel
fl_open_display();
Fl_X::make_xid(this);
return;
}
#endif
Fl_Window::show();
}
#ifdef WIN32
// Code used to switch output to an off-screen window. See macros in
// win32.H which save the old state in local variables.
HDC fl_makeDC(HBITMAP bitmap) {
HDC new_gc = CreateCompatibleDC(fl_gc);
SetTextAlign(new_gc, TA_BASELINE|TA_LEFT);
SetBkMode(new_gc, TRANSPARENT);
#if USE_COLORMAP
if (fl_palette) SelectPalette(new_gc, fl_palette, FALSE);
#endif
SelectObject(new_gc, bitmap);
return new_gc;
}
void fl_copy_offscreen(int x,int y,int w,int h,HBITMAP bitmap,int srcx,int srcy) {
HDC new_gc = CreateCompatibleDC(fl_gc);
SelectObject(new_gc, bitmap);
BitBlt(fl_gc, x, y, w, h, new_gc, srcx, srcy, SRCCOPY);
ReleaseDC(bitmap, new_gc);
}
extern void fl_restore_clip();
#endif
// Fl_Overlay_Window relies on flush() copying the back buffer to the
// front even if damage() == 0, thus erasing the overlay inside the region:
void Fl_Double_Window::flush() {
make_current(); // make sure fl_gc is non-zero
Fl_X *i = Fl_X::i(this);
if (!i->other_xid) {
#if USE_XDBE
if (can_xdbe()) i->other_xid =
XdbeAllocateBackBufferName(fl_display, fl_xid(this), XdbeCopied);
else
#endif
i->other_xid = fl_create_offscreen(w(), h());
clear_damage(~0);
}
#ifdef WIN32
if (DAMAGE_TEST()) {
HDC _sgc = fl_gc;
fl_gc = fl_makeDC(i->other_xid);
fl_restore_clip(); // duplicate region into new gc
draw();
ReleaseDC(i->other_xid, fl_gc);
fl_gc = _sgc;
}
#else // X:
#if USE_XDBE
int clipped = i->region != 0;
#endif
fl_clip_region(i->region); i->region = 0;
if (DAMAGE_TEST()) {
fl_window = i->other_xid;
draw();
fl_window = i->xid;
}
#if USE_XDBE
// It appears that swapbuffers ignores the clip region (it has to
// as the gc is not passed as an argument to it). This causes it
// to erase parts of the overlay that won't be redrawn, and (at least
// on XFree86) it is slower. So I don't use it unless the entire
// window is being redrawn. Sigh.
if (use_xdbe && !clipped) {
XdbeSwapInfo s;
s.swap_window = fl_xid(this);
s.swap_action = XdbeCopied;
XdbeSwapBuffers(fl_display, &s, 1);
// fl_clip_region(0); older fix for clipping problem but overlay blinked
return;
}
#endif
#endif
// on Irix (at least) it is faster to reduce the area copied to
// the current clip region:
int X,Y,W,H; fl_clip_box(0,0,w(),h(),X,Y,W,H);
fl_copy_offscreen(X, Y, W, H, i->other_xid, X, Y);
}
void Fl_Double_Window::resize(int X,int Y,int W,int H) {
int ow = w();
int oh = h();
Fl_Window::resize(X,Y,W,H);
#if USE_XDBE
if (use_xdbe) return;
#endif
Fl_X* i = Fl_X::i(this);
if (i && i->other_xid && (ow != w() || oh != h())) {
fl_delete_offscreen(i->other_xid);
i->other_xid = 0;
}
}
void Fl_Double_Window::hide() {
Fl_X* i = Fl_X::i(this);
if (i && i->other_xid) {
#if USE_XDBE
if (!use_xdbe)
#endif
fl_delete_offscreen(i->other_xid);
}
Fl_Window::hide();
}
Fl_Double_Window::~Fl_Double_Window() {
hide();
}
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