Golang Image.XPaint方法代碼示例

// clearCanvas erases all your pencil marks.
func clearCanvas(canvas *xgraphics.Image, win *xwindow.Window) {
	log.Println("Clearing canvas...")
	canvas.For(func(x, y int) xgraphics.BGRA {
		return bg
	})

	canvas.XDraw()
	canvas.XPaint(win.Id)
}

// This is a slightly modified version of xgraphics.XShowExtra that does
// not set any resize constraints on the window (so that it can go
// fullscreen).
func showImage(im *xgraphics.Image, name string, quit bool) *xwindow.Window {
	if len(name) == 0 {
		name = "xgbutil Image Window"
	}
	w, h := im.Rect.Dx(), im.Rect.Dy()

	win, err := xwindow.Generate(im.X)
	if err != nil {
		xgbutil.Logger.Printf("Could not generate new window id: %s", err)
		return nil
	}

	// Create a very simple window with dimensions equal to the image.
	win.Create(im.X.RootWin(), 0, 0, w, h, 0)

	// Make this window close gracefully.
	win.WMGracefulClose(func(w *xwindow.Window) {
		xevent.Detach(w.X, w.Id)
		keybind.Detach(w.X, w.Id)
		mousebind.Detach(w.X, w.Id)
		w.Destroy()

		if quit {
			xevent.Quit(w.X)
		}
	})

	// Set WM_STATE so it is interpreted as a top-level window.
	err = icccm.WmStateSet(im.X, win.Id, &icccm.WmState{
		State: icccm.StateNormal,
	})
	if err != nil { // not a fatal error
		xgbutil.Logger.Printf("Could not set WM_STATE: %s", err)
	}

	// Set _NET_WM_NAME so it looks nice.
	err = ewmh.WmNameSet(im.X, win.Id, name)
	if err != nil { // not a fatal error
		xgbutil.Logger.Printf("Could not set _NET_WM_NAME: %s", err)
	}

	// Paint our image before mapping.
	im.XSurfaceSet(win.Id)
	im.XDraw()
	im.XPaint(win.Id)

	// Now we can map, since we've set all our properties.
	// (The initial map is when the window manager starts managing.)
	win.Map()

	return win
}

// SetRoot sets the given background as the root window background.
func SetRoot(X *xgbutil.XUtil, bg *xgraphics.Image) error {
	root := X.RootWin()
	if err := bg.XSurfaceSet(root); err != nil {
		return err
	}
	bg.XDraw()
	bg.XPaint(root)
	// FIXME: This doesn't set the pixmap persistently. As soon as the program
	// exits, the pixmap is destroyed. Find a way to make it persistent.
	xprop.ChangeProp32(X, root, "_XROOTPMAP_ID", "PIXMAP", uint(bg.Pixmap))
	xprop.ChangeProp32(X, root, "ESETROOT_PMAP_ID", "PIXMAP", uint(bg.Pixmap))
	return nil
}

func updater(img *xgraphics.Image, win *xwindow.Window) {
	//We keep track of times based on 1024 frames
	frame := 0
	start := time.Now()
	var genStart, drawStart time.Time
	var genTotal, drawTotal time.Duration

	for {
		frame = frame + 1
		if frame > 1024 {
			frame = 0
			log.Printf("Time elapsed: %s\n", time.Now().Sub(start))
			log.Printf("Time generate: %s\n", genTotal)
			log.Printf("Time drawing: %s\n", drawTotal)
			start = time.Now()
			drawTotal, genTotal = 0, 0
		}

		genStart = time.Now()
		var x, y, i int
		for y = 0; y < 768; y++ {
			//set last pixel back to black
			img.SetBGRA(frame-1, y, xgraphics.BGRA{0, 0, 0, 255})
			for i = 0; i < 10; i++ {
				x = i + frame
				if x > 1024 {
					x = 1024
				}
				img.SetBGRA(x, y, xgraphics.BGRA{0, 0, 255, 255})
			}
		}
		genTotal += time.Now().Sub(genStart)

		drawStart = time.Now()
		//hopefully using checked will block us from drawing again before x
		//draws although XDraw might block anyway, we can check for an error
		//here
		err := img.XDrawChecked()
		if err != nil {
			log.Println(err)
			return
		}
		//img.XDraw()

		img.XPaint(win.Id)
		drawTotal += time.Now().Sub(drawStart)
	}
}