commit bf27b995ae1bc36ee0b24effcaf41ec477e7fae3
author Chris Craik <ccraik@google.com> Wed Apr 13 15:57:46 2016 -0700
committer Chris Craik <ccraik@google.com> Wed Apr 13 15:59:32 2016 -0700
tree 122aaa198253c48697f21c303e761381650d1cf0
parent e1b1ce77da273da6fc89d04a9c8ec09d0d8adca1

Avoid reentrance on ClipArea APIs

bug:28144676

Calling ClipArea::clipRegion from within ClipArea::clipPathWithTransform
has us handling op-based special casing twice, which caused all clip
paths to appear to be replace ops.

Change-Id: Ib842db53ffed4eee29470f773d59a3a1d07a1a0e

libs/hwui/ClipArea.cpp

diff --git a/libs/hwui/ClipArea.cpp b/libs/hwui/ClipArea.cpp
index 35fe06d..fe68239 100644
--- a/libs/hwui/ClipArea.cpp
+++ b/libs/hwui/ClipArea.cpp
@@ -253,7 +253,9 @@
     path.transform(skTransform, &transformed);
     SkRegion region;
     regionFromPath(transformed, region);
-    clipRegion(region, op);
+    enterRegionMode();
+    mClipRegion.op(region, op);
+    onClipRegionUpdated();
 }
 
 /*

libs/hwui/tests/unit/ClipAreaTests.cpp

diff --git a/libs/hwui/tests/unit/ClipAreaTests.cpp b/libs/hwui/tests/unit/ClipAreaTests.cpp
index b864703..54ca68d 100644
--- a/libs/hwui/tests/unit/ClipAreaTests.cpp
+++ b/libs/hwui/tests/unit/ClipAreaTests.cpp
@@ -132,6 +132,7 @@
         auto serializedClip = area.serializeClip(allocator);
         ASSERT_NE(nullptr, serializedClip);
         ASSERT_EQ(ClipMode::Rectangle, serializedClip->mode);
+        ASSERT_FALSE(serializedClip->intersectWithRoot) << "No replace, so no intersectWithRoot";
         EXPECT_EQ(Rect(200, 200), serializedClip->rect);
         EXPECT_EQ(serializedClip, area.serializeClip(allocator))
                 << "Requery of clip on unmodified ClipArea must return same pointer.";
@@ -145,6 +146,7 @@
         auto serializedClip = area.serializeClip(allocator);
         ASSERT_NE(nullptr, serializedClip);
         ASSERT_EQ(ClipMode::RectangleList, serializedClip->mode);
+        ASSERT_FALSE(serializedClip->intersectWithRoot) << "No replace, so no intersectWithRoot";
         auto clipRectList = reinterpret_cast<const ClipRectList*>(serializedClip);
         EXPECT_EQ(2, clipRectList->rectList.getTransformedRectanglesCount());
         EXPECT_EQ(Rect(37, 54, 145, 163), clipRectList->rect);
@@ -160,6 +162,7 @@
         auto serializedClip = area.serializeClip(allocator);
         ASSERT_NE(nullptr, serializedClip);
         ASSERT_EQ(ClipMode::Region, serializedClip->mode);
+        ASSERT_TRUE(serializedClip->intersectWithRoot) << "Replace op, so expect intersectWithRoot";
         auto clipRegion = reinterpret_cast<const ClipRegion*>(serializedClip);
         EXPECT_EQ(SkIRect::MakeWH(200, 200), clipRegion->region.getBounds())
                 << "Clip region should be 200x200";
@@ -169,6 +172,18 @@
     }
 }
 
+TEST(ClipArea, serializeClip_pathIntersectWithRoot) {
+    ClipArea area(createClipArea());
+    LinearAllocator allocator;
+    SkPath circlePath;
+    circlePath.addCircle(100, 100, 100);
+    area.clipPathWithTransform(circlePath, &Matrix4::identity(), SkRegion::kIntersect_Op);
+
+    auto serializedClip = area.serializeClip(allocator);
+    ASSERT_NE(nullptr, serializedClip);
+    EXPECT_FALSE(serializedClip->intersectWithRoot) << "No replace, so no intersectWithRoot";
+}
+
 TEST(ClipArea, serializeIntersectedClip) {
     ClipArea area(createClipArea());
     LinearAllocator allocator;