// Repaint paints the backing store onto the X window.
func (win *Window) repaint(x, y, w, h int) {
cr := cairo.Create(win.winSurface.Surface)
cr.Rectangle(float64(x), float64(y), float64(w), float64(h))
cr.Clip()
if flip {
cr.SetSourceRGB(1, 0, 0)
} else {
cr.SetSourceSurface(win.bufSurface.Surface, 0, 0)
// TODO clip to exposed area?
cr.SetOperator(cairo.OperatorSource)
}
// flip = !flip
cr.Paint()
}
// Loop runs the main X loop.
func (dpy *Display) Loop(uwin ui.Win) {
win := uwin.(*Window)
awaitEvent := make(chan bool)
go func() {
xfd := int(C.XConnectionNumber(dpy.dpy))
for {
<-awaitEvent
err := waitUntilReadable(xfd)
if err != nil {
log.Fatalf("select %#v", err)
}
dpy.eventReady <- true
}
}()
C.XFlush(dpy.dpy)
awaitEvent <- true
draw := false
for {
nextFrame := dpy.anims.NextFrame(draw)
select {
case <-dpy.eventReady:
dpy.processXEvents(win)
awaitEvent <- true
case <-dpy.drawReady:
draw = true
case t := <-nextFrame:
dpy.anims.Run()
// log.Printf("draw %s", t)
t = t
cr := cairo.Create(win.bufSurface.Surface)
win.delegate.Draw(cr)
win.repaint(0, 0, win.width, win.height)
C.XSync(dpy.dpy, 0)
draw = false
case f := <-dpy.funcs:
f()
case <-dpy.quit:
return
}
}
}
// Resize handles a resize of the window.
func (win *Window) resize(w, h int) {
if win.width == w && win.height == h {
return
}
win.width, win.height = w, h
if win.winSurface == nil {
visual := C.XDefaultVisual(win.dpy.dpy, 0)
win.winSurface = cairo.XlibSurfaceCreate(
unsafe.Pointer(win.dpy.dpy), uint64(win.xw), unsafe.Pointer(visual),
w, h)
} else {
win.winSurface.SetSize(w, h)
}
win.bufSurface = &cairo.XlibSurface{win.winSurface.CreateSimilar(cairo.ContentColor, w, h)}
cr := cairo.Create(win.bufSurface.Surface)
win.delegate.Draw(cr)
win.repaint(0, 0, w, h)
}