Only update widgets when content has changed

muesli · Feb 23, 2020 · c3d97f8 · c3d97f8
1 parent bbaadba
commit c3d97f8
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Showing 3 changed files with 39 additions and 23 deletions.
diff --git a/widget_button.go b/widget_button.go
@@ -3,6 +3,7 @@ package main
 import (
 	"image"
 	"log"
+	"sync"
 
 	"github.com/golang/freetype"
 	"github.com/muesli/streamdeck"
@@ -12,19 +13,23 @@ type ButtonWidget struct {
 	BaseWidget
 	icon  string
 	label string
+
+	init sync.Once
 }
 
 func (w *ButtonWidget) Update(dev *streamdeck.Device) {
-	img := image.NewRGBA(image.Rect(0, 0, 72, 72))
-	if w.label != "" {
-		drawImage(img, w.icon, 48, 12, 4)
-		drawString(img, ttfFont, w.label, 8, freetype.Pt(-1, img.Bounds().Dx()-6))
-	} else {
-		drawImage(img, w.icon, 64, 4, 4)
-	}
+	w.init.Do(func() {
+		img := image.NewRGBA(image.Rect(0, 0, 72, 72))
+		if w.label != "" {
+			_ = drawImage(img, w.icon, 48, 12, 4)
+			drawString(img, ttfFont, w.label, 8, freetype.Pt(-1, img.Bounds().Dx()-6))
+		} else {
+			_ = drawImage(img, w.icon, 64, 4, 4)
+		}
 
-	err := dev.SetImage(w.key, img)
-	if err != nil {
-		log.Fatal(err)
-	}
+		err := dev.SetImage(w.key, img)
+		if err != nil {
+			log.Fatal(err)
+		}
+	})
 }
diff --git a/widget_recent_window.go b/widget_recent_window.go
@@ -12,12 +12,19 @@ import (
 type RecentWindowWidget struct {
 	BaseWidget
 	window uint8
+
+	lastClass string
 }
 
 func (w *RecentWindowWidget) Update(dev *streamdeck.Device) {
 	img := image.NewRGBA(image.Rect(0, 0, 72, 72))
 
 	if int(w.window) < len(recentWindows) {
+		if w.lastClass == recentWindows[w.window].Class {
+			return
+		}
+		w.lastClass = recentWindows[w.window].Class
+
 		icon := resize.Resize(64, 64, recentWindows[w.window].Icon, resize.Bilinear)
 		draw.Draw(img, image.Rect(4, 4, 68, 68), icon, image.Point{0, 0}, draw.Src)
 	}

diff --git a/widget_top.go b/widget_top.go
@@ -18,20 +18,13 @@ type TopWidget struct {
 	BaseWidget
 	mode      string
 	fillColor string
+
+	lastValue float64
 }
 
 func (w *TopWidget) Update(dev *streamdeck.Device) {
-	img := image.NewRGBA(image.Rect(0, 0, 72, 72))
-
 	var value float64
 	var label string
-	var fill colorful.Color
-
-	fill, err := colorful.Hex(w.fillColor)
-	if err != nil {
-		panic("Invalid color: " + w.fillColor)
-	}
-
 	switch w.mode {
 	case "cpu":
 		cpuUsage, err := cpu.Percent(0, false)
@@ -54,18 +47,29 @@ func (w *TopWidget) Update(dev *streamdeck.Device) {
 		panic("Unknown widget mode: " + w.mode)
 	}
 
+	if w.lastValue == value {
+		return
+	}
+	w.lastValue = value
+
+	fill, err := colorful.Hex(w.fillColor)
+	if err != nil {
+		panic("Invalid color: " + w.fillColor)
+	}
+
+	img := image.NewRGBA(image.Rect(0, 0, 72, 72))
 	draw.Draw(img,
 		image.Rect(12, 6, 60, 54),
 		&image.Uniform{color.RGBA{255, 255, 255, 255}},
-		image.ZP, draw.Src)
+		image.Point{}, draw.Src)
 	draw.Draw(img,
 		image.Rect(13, 7, 59, 53),
 		&image.Uniform{color.RGBA{0, 0, 0, 255}},
-		image.ZP, draw.Src)
+		image.Point{}, draw.Src)
 	draw.Draw(img,
 		image.Rect(14, 7+int(46*(1-value/100)), 58, 53),
 		&image.Uniform{fill},
-		image.ZP, draw.Src)
+		image.Point{}, draw.Src)
 
 	drawString(img, ttfFont, strconv.FormatInt(int64(value), 10), 12, freetype.Pt(-1, -1))
 	drawString(img, ttfFont, "% "+label, 7, freetype.Pt(-1, img.Bounds().Dx()-4))