Tiling priorities in Android Webview.

android_webview/browser/parent_compositor_draw_constraints.cc

Index: android_webview/browser/parent_compositor_draw_constraints.cc
diff --git a/android_webview/browser/parent_compositor_draw_constraints.cc b/android_webview/browser/parent_compositor_draw_constraints.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e528d762164672058eacd6074cacabe9f3d58068
--- /dev/null
+++ b/android_webview/browser/parent_compositor_draw_constraints.cc
@@ -0,0 +1,31 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "android_webview/browser/parent_compositor_draw_constraints.h"
+
+namespace android_webview {
+
+ParentCompositorDrawConstraints::ParentCompositorDrawConstraints()
+    : is_layer(false) {
+}
+
+ParentCompositorDrawConstraints::ParentCompositorDrawConstraints(
+    bool is_layer,
+    const gfx::Transform& transform,
+    const gfx::Rect& surface_rect)
+    : is_layer(is_layer), transform(transform), surface_rect(surface_rect) {
+}
+
+bool ParentCompositorDrawConstraints::Equals(
+    const ParentCompositorDrawConstraints& other) const {
+  if (is_layer != other.is_layer)

[boliu, 2014/07/30 00:16:37]

You can do

if (is_layer != other.is_layer || transform != other.transform)
  return false;

// Don't care about the surface size when neither is on a layer.
return is_layer || surface_rect == other.surface_rect;

[hush (inactive), 2014/07/30 00:34:29]

Yeah this is cleaner.
The last line seems wrong though. It should be:
return !is_layer || surface_rect == other.surface_rect
On 2014/07/30 00:16:37, boliu wrote:

+    return false;
+  // Don't care about the surface size when neither is on a layer.
+  if (!is_layer)
+    return transform == other.transform;
+  else
+    return surface_rect == other.surface_rect && transform == other.transform;
+}
+
+}  // namespace webview