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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef COMPONENTS_VIZ_HOST_HIT_TEST_HIT_TEST_QUERY_H_ |
| 6 #define COMPONENTS_VIZ_HOST_HIT_TEST_HIT_TEST_QUERY_H_ |
| 7 |
| 8 #include <vector> |
| 9 |
| 10 #include "base/macros.h" |
| 11 #include "components/viz/common/hit_test/aggregated_hit_test_region.h" |
| 12 #include "ui/gfx/geometry/point.h" |
| 13 |
| 14 namespace viz { |
| 15 |
| 16 struct Target { |
| 17 FrameSinkId frame_sink_id; |
| 18 // Coordinates in the coordinate system of the target FrameSinkId. |
| 19 gfx::Point location_in_target; |
| 20 // Different flags are defined in services/viz/hit_test/public/interfaces/ |
| 21 // hit_test_region_list.mojom. |
| 22 uint32_t flags = 0; |
| 23 }; |
| 24 |
| 25 // Finds the target for a given location based on the AggregatedHitTestRegion |
| 26 // list aggregated by HitTestAggregator. |
| 27 // TODO(riajiang): Handle 3d space cases correctly. |
| 28 class HitTestQuery { |
| 29 public: |
| 30 HitTestQuery(); |
| 31 ~HitTestQuery(); |
| 32 |
| 33 // TODO(riajiang): Read from shmem directly once it's set up and delete this |
| 34 // function. For now, use fake data. Also need to validate the data received. |
| 35 // http://crbug.com/746470 |
| 36 void set_aggregated_hit_test_region_list( |
| 37 AggregatedHitTestRegion* aggregated_hit_test_region_list, |
| 38 uint32_t aggregated_hit_test_region_list_size) { |
| 39 aggregated_hit_test_region_list_ = aggregated_hit_test_region_list; |
| 40 aggregated_hit_test_region_list_size_ = |
| 41 aggregated_hit_test_region_list_size; |
| 42 } |
| 43 |
| 44 // Finds Target for |location_in_root|, including the FrameSinkId of the |
| 45 // target, updated location in the coordinate system of the target and |
| 46 // hit-test flags for the target. |
| 47 // Assumptions about the AggregatedHitTestRegion list received. |
| 48 // 1. The list is in ascending (front to back) z-order. |
| 49 // 2. Children count includes children of children. |
| 50 // 3. After applying transform to the incoming point, point is in the same |
| 51 // coordinate system as the bounds it is comparing against. |
| 52 // For example, |
| 53 // +e-------------+ |
| 54 // | +c---------| |
| 55 // | 1 |+a--+ | |
| 56 // | || 2 | | |
| 57 // | |+b--------| |
| 58 // | || | |
| 59 // | || 3 | |
| 60 // +--------------+ |
| 61 // In this case, after applying identity transform, 1 is in the coordinate |
| 62 // system of e; apply the transfrom-from-e-to-c and transform-from-c-to-a |
| 63 // then we get 2 in the coordinate system of a; apply the |
| 64 // transfrom-from-e-to-c and transform-from-c-to-b then we get 3 in the |
| 65 // coordinate system of b. |
| 66 Target FindTargetForLocation(const gfx::Point& location_in_root); |
| 67 |
| 68 private: |
| 69 // Helper function to find |target| for |location_in_parent| in the |region|, |
| 70 // returns true if a target is found and false otherwise. |location_in_parent| |
| 71 // is in the coordinate space of |region|'s parent. |
| 72 bool FindTargetInRegionForLocation(const gfx::Point& location_in_parent, |
| 73 AggregatedHitTestRegion* region, |
| 74 Target* target) const; |
| 75 |
| 76 AggregatedHitTestRegion* aggregated_hit_test_region_list_ = nullptr; |
| 77 uint32_t aggregated_hit_test_region_list_size_ = 0; |
| 78 |
| 79 DISALLOW_COPY_AND_ASSIGN(HitTestQuery); |
| 80 }; |
| 81 |
| 82 } // namespace viz |
| 83 |
| 84 #endif // COMPONENTS_VIZ_HOST_HIT_TEST_HIT_TEST_QUERY_H_ |
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