From c1e65aa31654f10984f9781dbf8095b4078c7917 Mon Sep 17 00:00:00 2001
From: ChandanChainani <chainanichan@gmail.com>
Date: Tue, 30 Nov 2021 19:33:11 +0530
Subject: [PATCH] Fix #1196: Add svg support for app/window icon (#2671)

---
 internal/driver/glfw/window.go          | 24 ++++++++++++++----------
 internal/painter/image.go               |  5 +++--
 internal/painter/image_internal_test.go |  8 ++++----
 3 files changed, 21 insertions(+), 16 deletions(-)

diff --git a/internal/driver/glfw/window.go b/internal/driver/glfw/window.go
index 97b6f87f68..76b95c0ea9 100644
--- a/internal/driver/glfw/window.go
+++ b/internal/driver/glfw/window.go
@@ -13,12 +13,14 @@ import (
 	"github.com/go-gl/glfw/v3.3/glfw"
 
 	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/canvas"
 	"fyne.io/fyne/v2/driver/desktop"
 	"fyne.io/fyne/v2/internal"
 	"fyne.io/fyne/v2/internal/app"
 	"fyne.io/fyne/v2/internal/cache"
 	"fyne.io/fyne/v2/internal/driver"
 	"fyne.io/fyne/v2/internal/driver/common"
+	"fyne.io/fyne/v2/internal/painter"
 	"fyne.io/fyne/v2/internal/painter/gl"
 )
 
@@ -28,6 +30,7 @@ const (
 	scrollSpeed            = float32(10)
 	doubleClickDelay       = 300 // ms (maximum interval between clicks for double click detection)
 	dragMoveThreshold      = 2   // how far can we move before it is a drag
+	windowIconSize         = 256
 )
 
 var (
@@ -246,24 +249,25 @@ func (w *window) SetIcon(icon fyne.Resource) {
 		return
 	}
 
-	if string(icon.Content()[:4]) == "<svg" {
-		fyne.LogError("Window icon does not support vector images", nil)
-		return
-	}
-
 	w.runOnMainWhenCreated(func() {
 		if w.icon == nil {
 			w.viewport.SetIcon(nil)
 			return
 		}
 
-		pix, _, err := image.Decode(bytes.NewReader(w.icon.Content()))
-		if err != nil {
-			fyne.LogError("Failed to decode image for window icon", err)
-			return
+		var img image.Image
+		if painter.IsResourceSVG(w.icon) {
+			img = painter.PaintImage(&canvas.Image{Resource: w.icon}, nil, windowIconSize, windowIconSize)
+		} else {
+			pix, _, err := image.Decode(bytes.NewReader(w.icon.Content()))
+			if err != nil {
+				fyne.LogError("Failed to decode image for window icon", err)
+				return
+			}
+			img = pix
 		}
 
-		w.viewport.SetIcon([]image.Image{pix})
+		w.viewport.SetIcon([]image.Image{img})
 	})
 }
 
diff --git a/internal/painter/image.go b/internal/painter/image.go
index 347d443d51..3d77274e5c 100644
--- a/internal/painter/image.go
+++ b/internal/painter/image.go
@@ -55,7 +55,7 @@ func PaintImage(img *canvas.Image, c fyne.Canvas, width, height int) image.Image
 		if img.Resource != nil {
 			name = img.Resource.Name()
 			file = bytes.NewReader(img.Resource.Content())
-			isSVG = isResourceSVG(img.Resource)
+			isSVG = IsResourceSVG(img.Resource)
 		} else {
 			name = img.File
 			handle, err := os.Open(img.File)
@@ -201,7 +201,8 @@ func isFileSVG(path string) bool {
 	return strings.ToLower(filepath.Ext(path)) == ".svg"
 }
 
-func isResourceSVG(res fyne.Resource) bool {
+// IsResourceSVG checks if the resource is an SVG or not.
+func IsResourceSVG(res fyne.Resource) bool {
 	if strings.ToLower(filepath.Ext(res.Name())) == ".svg" {
 		return true
 	}
diff --git a/internal/painter/image_internal_test.go b/internal/painter/image_internal_test.go
index 1641df5ce3..6b13d6de08 100644
--- a/internal/painter/image_internal_test.go
+++ b/internal/painter/image_internal_test.go
@@ -18,15 +18,15 @@ func TestIsFileSVG(t *testing.T) {
 func TestIsResourceSVG(t *testing.T) {
 	res, err := fyne.LoadResourceFromPath("./testdata/stroke.svg")
 	assert.Nil(t, err)
-	assert.True(t, isResourceSVG(res))
+	assert.True(t, IsResourceSVG(res))
 
 	res.(*fyne.StaticResource).StaticName = "stroke"
-	assert.True(t, isResourceSVG(res))
+	assert.True(t, IsResourceSVG(res))
 
 	svgString := "<svg version=\"1.1\"></svg>"
 	res.(*fyne.StaticResource).StaticContent = []byte(svgString)
-	assert.True(t, isResourceSVG(res))
+	assert.True(t, IsResourceSVG(res))
 
 	res.(*fyne.StaticResource).StaticContent = []byte("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" + svgString)
-	assert.True(t, isResourceSVG(res))
+	assert.True(t, IsResourceSVG(res))
 }