Add static UI noise overlay

internal/ui/noise.go

@@ -0,0 +1,83 @@
+package ui
+
+import (
+	"image"
+	"image/color"
+	"math/rand"
+	"os"
+	"strings"
+	"sync"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/canvas"
+)
+
+const (
+	noiseTileSize  = 128
+	noiseAlpha     = uint8(8)  // ~3% opacity
+	noiseVariance  = uint8(6)  // low contrast
+	noiseMeanValue = uint8(128)
+)
+
+var (
+	noiseOnce         sync.Once
+	noiseTile         *image.NRGBA
+	uiTextureEnabled  = true
+)
+
+func init() {
+	switch strings.ToLower(strings.TrimSpace(os.Getenv("VT_UI_TEXTURE"))) {
+	case "0", "false", "off", "no":
+		uiTextureEnabled = false
+	}
+}
+
+// NoisyBackgroundObjects returns background layers with an optional static noise overlay.
+func NoisyBackgroundObjects(bg fyne.CanvasObject) []fyne.CanvasObject {
+	if !uiTextureEnabled {
+		return []fyne.CanvasObject{bg}
+	}
+	return []fyne.CanvasObject{bg, NewNoiseOverlay()}
+}
+
+// NewNoiseOverlay creates a static, cached grayscale noise layer.
+func NewNoiseOverlay() fyne.CanvasObject {
+	return canvas.NewRaster(func(w, h int) image.Image {
+		if w <= 0 || h <= 0 {
+			return image.NewNRGBA(image.Rect(0, 0, 1, 1))
+		}
+		tile := getNoiseTile()
+		dst := image.NewNRGBA(image.Rect(0, 0, w, h))
+		tw := tile.Bounds().Dx()
+		th := tile.Bounds().Dy()
+		for y := 0; y < h; y++ {
+			ty := y % th
+			for x := 0; x < w; x++ {
+				tx := x % tw
+				dst.SetNRGBA(x, y, tile.NRGBAAt(tx, ty))
+			}
+		}
+		return dst
+	})
+}
+
+func getNoiseTile() *image.NRGBA {
+	noiseOnce.Do(func() {
+		tile := image.NewNRGBA(image.Rect(0, 0, noiseTileSize, noiseTileSize))
+		rng := rand.New(rand.NewSource(1))
+		for y := 0; y < noiseTileSize; y++ {
+			for x := 0; x < noiseTileSize; x++ {
+				delta := int(rng.Intn(int(noiseVariance)*2+1)) - int(noiseVariance)
+				v := int(noiseMeanValue) + delta
+				if v < 0 {
+					v = 0
+				} else if v > 255 {
+					v = 255
+				}
+				tile.SetNRGBA(x, y, color.NRGBA{R: uint8(v), G: uint8(v), B: uint8(v), A: noiseAlpha})
+			}
+		}
+		noiseTile = tile
+	})
+	return noiseTile
+}

main.go

@@ -6943,7 +6943,9 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 			widget.NewSeparator(),
 			content,
 		)
-		return container.NewMax(bg, container.NewPadded(body))
+		layers := ui.NoisyBackgroundObjects(bg)
+		layers = append(layers, container.NewPadded(body))
+		return container.NewMax(layers...)
 	}
 
 	sectionGap := func() fyne.CanvasObject {
@@ -10268,7 +10270,9 @@ func makeLabeledPanel(title, body string, min fyne.Size) *fyne.Container {
 	desc.Wrapping = fyne.TextWrapWord
 
 	box := container.NewVBox(header, desc, layout.NewSpacer())
-	return container.NewMax(rect, container.NewPadded(box))
+	layers := ui.NoisyBackgroundObjects(rect)
+	layers = append(layers, container.NewPadded(box))
+	return container.NewMax(layers...)
 }
 
 func buildMetadataPanel(state *appState, src *videoSource, min fyne.Size) (fyne.CanvasObject, func()) {
@@ -10289,7 +10293,9 @@ func buildMetadataPanel(state *appState, src *videoSource, min fyne.Size) (fyne.
 			widget.NewLabel("Load a clip to inspect its technical details."),
 			layout.NewSpacer(),
 		)
-		return container.NewMax(outer, container.NewPadded(body)), func() {}
+		layers := ui.NoisyBackgroundObjects(outer)
+		layers = append(layers, container.NewPadded(body))
+		return container.NewMax(layers...), func() {}
 	}
 
 	bitrate := "--"
@@ -10649,7 +10655,9 @@ Metadata: %s`,
 	)
 	scroll := container.NewVScroll(body)
 	scroll.SetMinSize(fyne.NewSize(0, 220))
-	return container.NewMax(outer, container.NewPadded(scroll)), updateCoverDisplay
+	layers := ui.NoisyBackgroundObjects(outer)
+	layers = append(layers, container.NewPadded(scroll))
+	return container.NewMax(layers...), updateCoverDisplay
 }
 
 func buildVideoPane(state *appState, min fyne.Size, src *videoSource, onCover func(string)) fyne.CanvasObject {
@@ -15313,7 +15321,9 @@ func buildUpscaleView(state *appState) fyne.CanvasObject {
 			widget.NewSeparator(),
 			content,
 		)
-		return container.NewMax(bg, container.NewPadded(body))
+		layers := ui.NoisyBackgroundObjects(bg)
+		layers = append(layers, container.NewPadded(body))
+		return container.NewMax(layers...)
 	}
 
 	// Scaling (method + blur)
@@ -15936,8 +15946,7 @@ func buildUpscaleView(state *appState) fyne.CanvasObject {
 	mainContent := split
 
 	content := container.NewMax(
-		canvas.NewRectangle(mediumBlue),
-		container.NewPadded(mainContent),
+		append(ui.NoisyBackgroundObjects(canvas.NewRectangle(mediumBlue)), container.NewPadded(mainContent))...,
 	)
 
 	actionBar := container.NewHBox(layout.NewSpacer(), applyBtn, addQueueBtn)