WIP Hittest Component.

components/viz/hittest/public/interfaces/hittest_data.mojom

+// Copyright 2016 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.
+
+module viz.hittest.mojom;
+
+import "cc/ipc/surface_id.mojom";
+import "ui/gfx/geometry/mojo/geometry.mojom";
+import "ui/gfx/mojo/transform.mojom";
+
+enum HittestRegionFlags { 
+  HITTEST_NONE = 0,
+  HITTEST_ASK, 
+  HITTEST_NO_TOUCH_EVENT_HANDLER,
+  HITTEST_IGNORE
+};
+
+struct HittestRegion {
+    HittestRegionFlags flags;
+    gfx.mojom.Rect rect;
+    gfx.mojom.Transform transform;
+};
+
+struct HittestChildRegion {
+    cc.mojom.SurfaceId surfaceId;
+    HittestRegionFlags flags;
+    gfx.mojom.Rect rect;
+    gfx.mojom.Transform transform;
+};
+
+struct HittestData {
+  cc.mojom.SurfaceId surfaceId;
+  gfx.mojom.RectF rect;
+  uint32 flags;
+  array<HittestRegion> regions;

[rjkroege, 2017/05/29 15:58:03]

this doesn't not preserve Z order. HittestChildRegion and HittestRegion can be
interleaved in stacking? How do you maintain this information?

+  array<HittestChildRegion> child_regions;
+};