improve batch efficiency when long paragraph is selected

zhuxingwei · zhuxingwei · commit 0a89e28f7bf4 · 2019-04-17T10:02:34.000+08:00
diff --git a/Runtime/rendering/paragraph.cs b/Runtime/rendering/paragraph.cs
@@ -372,9 +372,11 @@ void _paintSelection(Canvas canvas, Offset effectiveOffset) {
             D.assert(this.selectionColor != null);
             var paint = new Paint {color = this.selectionColor};
 
+            Path barPath = new Path();
             foreach (var box in this._selectionRects) {
-                canvas.drawRect(box.toRect().shift(effectiveOffset), paint);
+                barPath.addRect(box.toRect().shift(effectiveOffset));
             }
+            canvas.drawPath(barPath, paint);
         }
 
         void _layoutText(float minWidth = 0.0f, float maxWidth = float.PositiveInfinity) {

Original file line number	Diff line number	Diff line change
`@@ -372,9 +372,11 @@ void _paintSelection(Canvas canvas, Offset effectiveOffset) {`
`372`	`372`	`D.assert(this.selectionColor != null);`
`373`	`373`	`var paint = new Paint {color = this.selectionColor};`
`374`	`374`
	`375`	`+ Path barPath = new Path();`
`375`	`376`	`foreach (var box in this._selectionRects) {`
`376`		`- canvas.drawRect(box.toRect().shift(effectiveOffset), paint);`
	`377`	`+ barPath.addRect(box.toRect().shift(effectiveOffset));`
`377`	`378`	`}`
	`379`	`+ canvas.drawPath(barPath, paint);`
`378`	`380`	`}`
`379`	`381`
`380`	`382`	`void _layoutText(float minWidth = 0.0f, float maxWidth = float.PositiveInfinity) {`