Merge pull request #14 from otraore/set-icon

Add support for setting an icon of a window

pixelgl/window.go

@@ -1,6 +1,7 @@
 package pixelgl
 
 import (
+	"image"
 	"image/color"
 	"runtime"
 
@@ -20,6 +21,18 @@ type WindowConfig struct {
 	// Title at the top of the Window.
 	Title string
 
+	// Icon specifies the icon images available to be used by the window. This is usually displayed
+	// in the top bar of the window or in the task bar of the desktop environment.
+	//
+	// If passed one image, it will use that image, if passed an array of images
+	// those of or closest to the sizes desired by the system are selected.
+	// The desired image sizes varies depending on platform and system settings. The selected
+	// images will be rescaled as needed. Good sizes include 16x16, 32x32 and 48x48.
+	//
+	// Note: Setting this value doesn't have an effect on OSX. You'll need to set the icon
+	// when bundling your application for release.
+	Icon []pixel.Picture
+
 	// Bounds specify the bounds of the Window in pixels.
 	Bounds pixel.Rect
 
@@ -118,7 +131,14 @@ func NewWindow(cfg WindowConfig) (*Window, error) {
 	w.Update()
 
 	runtime.SetFinalizer(w, (*Window).Destroy)
-
+	imgs := make([]image.Image, len(cfg.Icon))
+	for i, v := range cfg.Icon {
+		pic := pixel.PictureDataFromPicture(v)
+		imgs[i] = pic.Image()
+	}
+	mainthread.Call(func() {
+		w.window.SetIcon(imgs)
+	})
 	return w, nil
 }