commit 4e9d9b2a590105035c29f12ecf0689333e6b55e7
author Chris Craik <ccraik@google.com> Fri Jun 12 11:07:23 2015 -0700
committer Chris Craik <ccraik@google.com> Fri Jun 12 11:07:23 2015 -0700
tree 250eea350d584e8d280d5923eb2a3ad092d2f3c7
parent cc87cfa29c4b38d1f119bdce652918565b0fed0f

Revert to save-layer based alpha if layer would be too large

bug:21011574
Change-Id: I323f2398188ffc2bbed6a98578d25d7e5f6c337d

libs/hwui/RenderProperties.cpp

diff --git a/libs/hwui/RenderProperties.cpp b/libs/hwui/RenderProperties.cpp
index 07b8ce6..4f6ef4e 100644
--- a/libs/hwui/RenderProperties.cpp
+++ b/libs/hwui/RenderProperties.cpp
@@ -152,7 +152,24 @@
             clipFlags &= ~CLIP_TO_BOUNDS; // bounds clipping done by layer
         }
 
-        ALOGD("%*sScaleAlpha %.2f", level * 2, "", mPrimitiveFields.mAlpha);
+        if (CC_LIKELY(isLayer || !getHasOverlappingRendering())) {
+            // simply scale rendering content's alpha
+            ALOGD("%*sScaleAlpha %.2f", level * 2, "", mPrimitiveFields.mAlpha);
+        } else {
+            // savelayeralpha to create an offscreen buffer to apply alpha
+            Rect layerBounds(0, 0, getWidth(), getHeight());
+            if (clipFlags) {
+                getClippingRectForFlags(clipFlags, &layerBounds);
+                clipFlags = 0; // all clipping done by savelayer
+            }
+            ALOGD("%*sSaveLayerAlpha %d, %d, %d, %d, %d, 0x%x", level * 2, "",
+                    (int)layerBounds.left, (int)layerBounds.top,
+                    (int)layerBounds.right, (int)layerBounds.bottom,
+                    (int)(mPrimitiveFields.mAlpha * 255),
+                    SkCanvas::kHasAlphaLayer_SaveFlag | SkCanvas::kClipToLayer_SaveFlag);
+        }
+
+
     }
     if (clipFlags) {
         Rect clipRect;