commit 02806288d1c56475413888a934c796e6e4eb11c5
author Chris Craik <ccraik@google.com> Fri Mar 11 19:16:21 2016 -0800
committer Chris Craik <ccraik@google.com> Mon Mar 14 13:26:25 2016 -0700
tree 837197b3b31a6d43ed61c141fa4b3a288d9c5a0b
parent 481355a45df5a8e5c57b1058f48cb1102b05ebc0

Fix flickering when layers resize in-place

bug:27248275
Change-Id: Ia11c93ebc1097f3735071204b6f14ca079bb9fc4

libs/hwui/BakedOpRenderer.cpp

diff --git a/libs/hwui/BakedOpRenderer.cpp b/libs/hwui/BakedOpRenderer.cpp
index da5ecca..bb3ea3f 100644
--- a/libs/hwui/BakedOpRenderer.cpp
+++ b/libs/hwui/BakedOpRenderer.cpp
@@ -40,6 +40,16 @@
 void BakedOpRenderer::startRepaintLayer(OffscreenBuffer* offscreenBuffer, const Rect& repaintRect) {
     LOG_ALWAYS_FATAL_IF(mRenderTarget.offscreenBuffer, "already has layer...");
 
+    // subtract repaintRect from region, since it will be regenerated
+    if (repaintRect.contains(0, 0,
+                offscreenBuffer->viewportWidth, offscreenBuffer->viewportHeight)) {
+        // repaint full layer, so throw away entire region
+        offscreenBuffer->region.clear();
+    } else {
+        offscreenBuffer->region.subtractSelf(android::Rect(repaintRect.left, repaintRect.top,
+                repaintRect.right, repaintRect.bottom));
+    }
+
     mRenderTarget.offscreenBuffer = offscreenBuffer;
 
     // create and bind framebuffer