// drawPencil takes an (x, y) position (from a MotionNotify event) and draws
// a rectangle of size pencilTip on to canvas.
func drawPencil(canvas *xgraphics.Image, win *xwindow.Window, x, y int) {
// Create a subimage at (x, y) with pencilTip width and height from canvas.
// Creating subimages is very cheap---no pixels are copied.
// Moreover, when subimages are drawn to the screen, only the pixels in
// the sub-image are sent to X.
tipRect := midRect(x, y, pencilTip, pencilTip, width, height)
// If the rectangle contains no pixels, don't draw anything.
if tipRect.Empty() {
return
}
// Output a little message.
log.Printf("Drawing pencil point at (%d, %d)", x, y)
// Create the subimage of the canvas to draw to.
tip := canvas.SubImage(tipRect)
fmt.Println(tip.Rect)
// Now color each pixel in tip with the pencil color.
tip.For(func(x, y int) xgraphics.BGRA {
return xgraphics.BlendBGRA(tip.At(x, y).(xgraphics.BGRA), pencil)
})
// Now draw the changes to the pixmap.
tip.XDraw()
// And paint them to the window.
tip.XPaint(win.Id)
}
// This. This seems to be the solution. 0.72ns/op. RGBA -> RGBA is 0.02ns/op. Draw is 180ns/op.
// from https://github.com/BurntSushi/xgbutil/blob/master/xgraphics/convert.go
func convertRGBAtoXgb(dest *xgraphics.Image, src *image.RGBA) {
var x, y, i, si int
for x = dest.Rect.Min.X; x < dest.Rect.Max.X; x++ {
for y = dest.Rect.Min.Y; y < dest.Rect.Max.Y; y++ {
si = src.PixOffset(x, y)
i = dest.PixOffset(x, y)
dest.Pix[i+0] = src.Pix[si+2]
dest.Pix[i+1] = src.Pix[si+1]
dest.Pix[i+2] = src.Pix[si+0]
dest.Pix[i+3] = src.Pix[si+3]
}
}
}
// paint uses the xgbutil/xgraphics package to copy the area corresponding
// to ximg in its pixmap to the window. It will also issue a clear request
// before hand to try and avoid artifacts.
func (w *Window) paint(ximg *xgraphics.Image) {
// If the image is bigger than the canvas, this is always (0, 0).
// If the image is the same size, then it is also (0, 0).
// If a dimension of the image is smaller than the canvas, then:
// x = (canvas_width - image_width) / 2 and
// y = (canvas_height - image_height) / 2
xmargin, ymargin := 0, 0
if ximg.Bounds().Dx() < w.Geom.Width() {
xmargin = (w.Geom.Width() - ximg.Bounds().Dx()) / 2
}
if ximg.Bounds().Dy() < w.Geom.Height() {
ymargin = (w.Geom.Height() - ximg.Bounds().Dy()) / 2
}
ximg.XExpPaint(w.Id, xmargin, ymargin)
}
// vpCenter inspects the canvas and image geometry, and determines where the
// origin of the image should be painted into the canvas.
// If the image is bigger than the canvas, this is always (0, 0).
// If the image is the same size, then it is also (0, 0).
// If a dimension of the image is smaller than the canvas, then:
// x = (canvas_width - image_width) / 2 and
// y = (canvas_height - image_height) / 2
func vpCenter(ximg *xgraphics.Image, canWidth, canHeight int) image.Point {
xmargin, ymargin := 0, 0
if ximg.Bounds().Dx() < canWidth {
xmargin = (canWidth - ximg.Bounds().Dx()) / 2
}
if ximg.Bounds().Dy() < canHeight {
ymargin = (canHeight - ximg.Bounds().Dy()) / 2
}
return image.Point{xmargin, ymargin}
}
// SetImageToBg sets the given image into the background at the proper location
// for the named output to display.
func SetImageToBg(X *xgbutil.XUtil,
bg *xgraphics.Image,
img image.Image,
name string) error {
output, err := util.GetOutputByName(X, name)
if err != nil {
return err
}
geom, err := util.OutputRect(X, output)
if err != nil {
return err
}
if err = bg.CreatePixmap(); err != nil {
return err
}
bg.XDraw()
draw.Draw(bg, geom, img, img.Bounds().Min, draw.Src)
return nil
}
func copyToXGraphicsImage(xs *xgraphics.Image, buffer *image.RGBA) {
//Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*4]
xdata := xs.Pix
bdata := buffer.Pix
if xs.Bounds() == buffer.Bounds() {
copy(xdata, bdata)
} else {
xb := xs.Bounds()
bb := buffer.Bounds()
miny := xb.Min.Y
if miny < bb.Min.Y {
miny = bb.Min.Y
}
maxy := xb.Max.Y
if maxy > bb.Max.Y {
maxy = bb.Max.Y
}
xRowLen := (xb.Max.X - xb.Min.X)
bRowLen := (bb.Max.X - bb.Min.X)
rowLen := xRowLen
if bRowLen < rowLen {
rowLen = bRowLen
}
for y := miny; y < maxy; y++ {
xstart := (y-xb.Min.Y)*xs.Stride - xb.Min.X*4
bstart := (y-bb.Min.Y)*buffer.Stride - bb.Min.X*4
xrow := xdata[xstart : xstart+rowLen*4]
brow := bdata[bstart : bstart+rowLen*4]
copy(xrow, brow)
}
}
// xgraphics.Image is BGRA, not RGBA, so swap some bits
for i := 0; i < len(xdata)/4; i++ {
index := i * 4
xdata[index], xdata[index+2] = xdata[index+2], xdata[index]
}
}
// blendCheckered is basically a copy of xgraphics.Blend with no interfaces.
// (It's faster.) Also, it is hardcoded to blend into a checkered background.
func blendCheckered(dest *xgraphics.Image) {
dsrc := dest.Bounds()
dmnx, dmxx, dmny, dmxy := dsrc.Min.X, dsrc.Max.X, dsrc.Min.Y, dsrc.Max.Y
clr1 := xgraphics.BGRA{B: 0xff, G: 0xff, R: 0xff, A: 0xff}
clr2 := xgraphics.BGRA{B: 0xde, G: 0xdc, R: 0xdf, A: 0xff}
var dx, dy int
var bgra, clr xgraphics.BGRA
for dx = dmnx; dx < dmxx; dx++ {
for dy = dmny; dy < dmxy; dy++ {
if dx%30 >= 15 {
if dy%30 >= 15 {
clr = clr1
} else {
clr = clr2
}
} else {
if dy%30 >= 15 {
clr = clr2
} else {
clr = clr1
}
}
bgra = dest.At(dx, dy).(xgraphics.BGRA)
dest.SetBGRA(dx, dy, xgraphics.BlendBGRA(clr, bgra))
}
}
}
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)
}
}
// 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)
}
// drawGopher draws the gopher image to the canvas.
func drawGopher(canvas *xgraphics.Image, gopher image.Image,
win *xwindow.Window, x, y int) {
// Find the rectangle of the canvas where we're going to draw the gopher.
gopherRect := midRect(x, y, gopherWidth, gopherHeight, width, height)
// If the rectangle contains no pixels, don't draw anything.
if gopherRect.Empty() {
return
}
// Output a little message.
log.Printf("Drawing gopher at (%d, %d)", x, y)
// Get a subimage of the gopher that's in sync with gopherRect.
gopherPt := image.Pt(gopher.Bounds().Min.X, gopher.Bounds().Min.Y)
if gopherRect.Min.X == 0 {
gopherPt.X = gopherWidth - gopherRect.Dx()
}
if gopherRect.Min.Y == 0 {
gopherPt.Y = gopherHeight - gopherRect.Dy()
}
// Create the canvas subimage.
subCanvas := canvas.SubImage(gopherRect)
// Blend the gopher image into the sub-canvas.
// This does alpha blending.
xgraphics.Blend(subCanvas, gopher, gopherPt)
// Now draw the changes to the pixmap.
subCanvas.XDraw()
// And paint them to the window.
subCanvas.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
}
func (p *piece) Create(act, inact *xgraphics.Image) {
if act != nil {
if p.active > 0 {
xgraphics.FreePixmap(p.X, p.active)
}
act.CreatePixmap()
act.XDraw()
p.active = act.Pixmap
}
if inact != nil {
if p.inactive > 0 {
xgraphics.FreePixmap(p.X, p.inactive)
}
inact.CreatePixmap()
inact.XDraw()
p.inactive = inact.Pixmap
}
}
// 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
}
// paint uses the xgbutil/xgraphics package to copy the area corresponding
// to ximg in its pixmap to the window. It will also issue a clear request
// before hand to try and avoid artifacts.
func (w *window) paint(ximg *xgraphics.Image) {
dst := vpCenter(ximg, w.Geom.Width(), w.Geom.Height())
// UUU Commenting this out avoids flickering, and I see no artifacts!
// w.ClearAll()
ximg.XExpPaint(w.Id, dst.X, dst.Y)
}
func makeWindow(ximage *xgraphics.Image) (*xwindow.Window, *bool) {
w, h := ximage.Rect.Dx(), ximage.Rect.Dy()
window, err := xwindow.Generate(ximage.X)
if err != nil {
xgbutil.Logger.Printf("Could not generate new window id: %s", err)
return nil, nil
}
window.Create(ximage.X.RootWin(), 0, 0, w, h, xproto.CwBackPixel, 0x00000000)
window.Listen(xproto.EventMaskExposure,
xproto.EventMaskKeyPress,
xproto.EventMaskStructureNotify,
xproto.EventMaskVisibilityChange)
window.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()
xevent.Quit(w.X)
})
err = icccm.WmStateSet(ximage.X, window.Id, &icccm.WmState{
State: icccm.StateNormal,
})
if err != nil {
xgbutil.Logger.Printf("Could not set WM_STATE: %s", err)
}
err = ewmh.WmNameSet(ximage.X, window.Id, "Computer System Monitor")
if err != nil {
xgbutil.Logger.Printf("Could not set _NET_WM_NAME: %s", err)
}
err = keybind.KeyPressFun(
func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
err := ewmh.WmStateReq(ximage.X, window.Id, ewmh.StateToggle,
"_NET_WM_STATE_FULLSCREEN")
if err != nil {
log.Fatal(err)
}
}).Connect(ximage.X, window.Id, "f", false)
if err != nil {
log.Fatal(err)
}
xevent.ExposeFun(
func(xu *xgbutil.XUtil, event xevent.ExposeEvent) {
ximage.XExpPaint(window.Id, 0, 0)
}).Connect(ximage.X, window.Id)
obscured := false
xevent.VisibilityNotifyFun(
func(xu *xgbutil.XUtil, event xevent.VisibilityNotifyEvent) {
obscured = event.State == xproto.VisibilityFullyObscured
}).Connect(ximage.X, window.Id)
window.Map()
return window, &obscured
}