Fix performance issue where images could re-draw a lot when not needed

fyne-io · Mar 30, 2021 · 1dfd83b · 1dfd83b
1 parent 23ba3f4
commit 1dfd83b
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diff --git a/canvas/image.go b/canvas/image.go
@@ -71,6 +71,10 @@ func (i *Image) Alpha() float64 {
 // Resize on an image will scale the content or reposition it according to FillMode.
 // It will normally cause a Refresh to ensure the pixels are recalculated.
 func (i *Image) Resize(s fyne.Size) {
+	if s == i.Size() {
+		return
+	}
+
 	i.baseObject.Resize(s)
 
 	Refresh(i)

diff --git a/canvas/raster.go b/canvas/raster.go
@@ -34,6 +34,10 @@ func (r *Raster) Alpha() float64 {
 // Resize on a raster image causes the new size to be set and then calls Refresh.
 // This causes the underlying data to be recalculated and a new output to be drawn.
 func (r *Raster) Resize(s fyne.Size) {
+	if s == r.Size() {
+		return
+	}
+
 	r.baseObject.Resize(s)
 	Refresh(r)
 }