Overdraw avoidance in new pipeline
bug:27873093
Adds the simple overdraw avoidance optimization to the new
pipeline. This means when LayerBuilder defers draws that are opaque over
the full area of the repaint region, it will discard all drawing content
beneth.
Also moves a lot of complexity out of BakedOpState's header.
Change-Id: Iffca6d8e1b170ef31a5d6c83d25592670e02323d
diff --git a/libs/hwui/utils/PaintUtils.h b/libs/hwui/utils/PaintUtils.h
index db53713..4faab9a 100644
--- a/libs/hwui/utils/PaintUtils.h
+++ b/libs/hwui/utils/PaintUtils.h
@@ -67,6 +67,21 @@
&& getXfermode(paint.getXfermode()) == SkXfermode::kSrcOver_Mode;
}
+ static bool isOpaquePaint(const SkPaint* paint) {
+ if (!paint) return true; // default (paintless) behavior is SrcOver, black
+
+ if (paint->getAlpha() != 0xFF
+ || PaintUtils::isBlendedShader(paint->getShader())
+ || PaintUtils::isBlendedColorFilter(paint->getColorFilter())) {
+ return false;
+ }
+
+ // Only let simple srcOver / src blending modes declare opaque, since behavior is clear.
+ SkXfermode::Mode mode = getXfermode(paint->getXfermode());
+ return mode == SkXfermode::Mode::kSrcOver_Mode
+ || mode == SkXfermode::Mode::kSrc_Mode;
+ }
+
static bool isBlendedShader(const SkShader* shader) {
if (shader == nullptr) {
return false;