cc: Apply occlusion before creating quads in SolidColorLayerImpl.

This makes the AppendQuads method query occlusion directly and subtract
it from the quads it would create before they are created, skipping
quads that are completely occluded and avoiding a malloc/free for them.

R=enne
BUG=344962

Review URL: https://codereview.chromium.org/196523005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256951 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 31 insertions, 0 deletions

diff --git a/cc/test/layer_test_common.cc b/cc/test/layer_test_common.cc
index 0171999..66e49a8 100644
--- a/cc/test/layer_test_common.cc
+++ b/cc/test/layer_test_common.cc
@@ -55,4 +55,35 @@ void LayerTestCommon::VerifyQuadsExactlyCoverRect(const QuadList& quads,
   EXPECT_TRUE(remaining.IsEmpty());
 }
 
+// static
+void LayerTestCommon::VerifyQuadsCoverRectWithOcclusion(
+    const QuadList& quads,
+    const gfx::Rect& rect,
+    const gfx::Rect& occluded,
+    size_t* partially_occluded_count) {
+  // No quad should exist if it's fully occluded.
+  for (size_t i = 0; i < quads.size(); ++i) {
+    EXPECT_FALSE(occluded.Contains(quads[i]->visible_rect));
+  }
+
+  // Quads that are fully occluded on one axis only should be shrunken.
+  for (size_t i = 0; i < quads.size(); ++i) {
+    DrawQuad* quad = quads[i];
+    bool fully_occluded_horizontal = quad->rect.x() >= occluded.x() &&
+                                     quad->rect.right() <= occluded.right();
+    bool fully_occluded_vertical = quad->rect.y() >= occluded.y() &&
+                                   quad->rect.bottom() <= occluded.bottom();
+    bool should_be_occluded =
+        quad->rect.Intersects(occluded) &&
+        (fully_occluded_vertical || fully_occluded_horizontal);
+    if (!should_be_occluded) {
+      EXPECT_EQ(quad->rect.ToString(), quad->visible_rect.ToString());
+    } else {
+      EXPECT_NE(quad->rect.ToString(), quad->visible_rect.ToString());
+      EXPECT_TRUE(quad->rect.Contains(quad->visible_rect));
+      ++(*partially_occluded_count);
+    }
+  }
+}
+
 }  // namespace cc