Index: components/viz/host/hit_test/hit_test_query.h |
diff --git a/components/viz/host/hit_test/hit_test_query.h b/components/viz/host/hit_test/hit_test_query.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..f98a3a20d04ed88aca04959d6e9e818b69565ba1 |
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+++ b/components/viz/host/hit_test/hit_test_query.h |
@@ -0,0 +1,84 @@ |
+// Copyright 2017 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. |
+ |
+#ifndef COMPONENTS_VIZ_HOST_HIT_TEST_HIT_TEST_QUERY_H_ |
+#define COMPONENTS_VIZ_HOST_HIT_TEST_HIT_TEST_QUERY_H_ |
+ |
+#include <vector> |
+ |
+#include "base/macros.h" |
+#include "components/viz/common/hit_test/aggregated_hit_test_region.h" |
+#include "ui/gfx/geometry/point.h" |
+ |
+namespace viz { |
+ |
+struct Target { |
+ FrameSinkId frame_sink_id; |
+ // Coordinates in the coordinate system of the target FrameSinkId. |
+ gfx::Point location_in_target; |
+ // Different flags are defined in services/viz/hit_test/public/interfaces/ |
+ // hit_test_region_list.mojom. |
+ uint32_t flags = 0; |
+}; |
+ |
+// Finds the target for a given location based on the AggregatedHitTestRegion |
+// list aggregated by HitTestAggregator. |
+// TODO(riajiang): Handle 3d space cases correctly. |
+class HitTestQuery { |
+ public: |
+ HitTestQuery(); |
+ ~HitTestQuery(); |
+ |
+ // TODO(riajiang): Read from shmem directly once it's set up and delete this |
+ // function. For now, use fake data. Also need to validate the data received. |
+ // http://crbug.com/746470 |
+ void set_aggregated_hit_test_region_list( |
+ AggregatedHitTestRegion* aggregated_hit_test_region_list, |
+ uint32_t aggregated_hit_test_region_list_size) { |
+ aggregated_hit_test_region_list_ = aggregated_hit_test_region_list; |
+ aggregated_hit_test_region_list_size_ = |
+ aggregated_hit_test_region_list_size; |
+ } |
+ |
+ // Finds Target for |location_in_root|, including the FrameSinkId of the |
+ // target, updated location in the coordinate system of the target and |
+ // hit-test flags for the target. |
+ // Assumptions about the AggregatedHitTestRegion list received. |
+ // 1. The list is in ascending (front to back) z-order. |
+ // 2. Children count includes children of children. |
+ // 3. After applying transform to the incoming point, point is in the same |
+ // coordinate system as the bounds it is comparing against. |
+ // For example, |
+ // +e-------------+ |
+ // | +c---------| |
+ // | 1 |+a--+ | |
+ // | || 2 | | |
+ // | |+b--------| |
+ // | || | |
+ // | || 3 | |
+ // +--------------+ |
+ // In this case, after applying identity transform, 1 is in the coordinate |
+ // system of e; apply the transfrom-from-e-to-c and transform-from-c-to-a |
+ // then we get 2 in the coordinate system of a; apply the |
+ // transfrom-from-e-to-c and transform-from-c-to-b then we get 3 in the |
+ // coordinate system of b. |
+ Target FindTargetForLocation(const gfx::Point& location_in_root); |
+ |
+ private: |
+ // Helper function to find |target| for |location_in_parent| in the |region|, |
+ // returns true if a target is found and false otherwise. |location_in_parent| |
+ // is in the coordinate space of |region|'s parent. |
+ bool FindTargetInRegionForLocation(const gfx::Point& location_in_parent, |
+ AggregatedHitTestRegion* region, |
+ Target* target) const; |
+ |
+ AggregatedHitTestRegion* aggregated_hit_test_region_list_ = nullptr; |
+ uint32_t aggregated_hit_test_region_list_size_ = 0; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(HitTestQuery); |
+}; |
+ |
+} // namespace viz |
+ |
+#endif // COMPONENTS_VIZ_HOST_HIT_TEST_HIT_TEST_QUERY_H_ |