client refactor

client/coalesce.go

@@ -3,38 +3,6 @@ package client
 /*
 Fyne-friendly latest-wins coalescing for canvas.NewRaster(draw func(w,h int) image.Image).
 
-How to use (integration sketch):
-
-	type editor struct {
-	    w      *world.World
-	    drawer world.PrimitiveDrawer  // wraps gg.Context over a backing *image.RGBA
-	    raster *canvas.Raster
-
-	    co *client.RasterCoalescer[world.RenderParams]
-	}
-
-	func (e *editor) initCoalescer() {
-	    exec := client.FyneMainThreadExecutor{} // uses fyne.CurrentApp().Driver().RunOnMain
-	    e.co = client.NewRasterCoalescer(exec, e.raster, func(wPx, hPx int, p world.RenderParams) image.Image {
-	        // your existing draw pipeline:
-	        // 1) ensure viewport/margins inside p are consistent with wPx/hPx if needed
-	        // 2) call e.w.Render(e.drawer, p)
-	        // 3) get image from gg.Context, crop margins, return
-	        _ = e.w.Render(e.drawer, p)
-	        return e.drawerImageCropped() // your code
-	    })
-	}
-
-	// Call from input handlers (pan/zoom/etc). Can be from any goroutine.
-	func (e *editor) RefreshUI(p world.RenderParams) {
-	    e.co.Request(p) // schedules raster.Refresh() on UI thread
-	}
-
-	// Raster draw callback:
-	func (e *editor) draw(wPx, hPx int) image.Image {
-	    return e.co.Draw(wPx, hPx)
-	}
-
 Key property:
 - draw() renders at most once per invocation (never loops).
 - if new requests arrived while drawing, we schedule exactly one extra Refresh.