Index: components/viz/common/hit_test/display_hit_test_data.h |
diff --git a/components/viz/common/hit_test/display_hit_test_data.h b/components/viz/common/hit_test/display_hit_test_data.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..9dd80b80645d7e20fcadaad2e712554a26878e7d |
--- /dev/null |
+++ b/components/viz/common/hit_test/display_hit_test_data.h |
@@ -0,0 +1,62 @@ |
+// 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_COMMON_HIT_TEST_DISPLAY_HIT_TEST_DATA_H_ |
+#define COMPONENTS_VIZ_COMMON_HIT_TEST_DISPLAY_HIT_TEST_DATA_H_ |
+ |
+#include <stdint.h> |
+ |
+#include "cc/surfaces/surface_id.h" |
+#include "services/viz/hit_test/public/interfaces/hit_test_data.mojom.h" |
+ |
+namespace viz { |
+ |
+// DiplayHitTestData contains the aggregated hit-test data for the Display. |
+// |
+// It is designed to be in shared memory so that the viz process can |
+// write the hit_test data, and the browser / ws process can read without |
+// process hops. |
+// |
+// One instance of this class contains a double buffer of entries - |
+// the viz process will write into one half while client processes read from |
+// the other. read_offset is used to swap buffers atomically. |
+ |
+// A DisplayHitTestRegion element with child_count of kEndOfList indicates |
+// the last element ( end of the list ). |
+constexpr int kEndOfList = -1; |
+ |
+// A read_offset set to kOldPleaseReAcquire indicates that the buffer has been |
+// resized and clients should re-acquire their reference. |
+constexpr int kOldPleaseReAcquire = -1; |
+ |
+struct DisplayHitTestRegion { |
+ // The frame_sink_id corresponding to this region. Events that match |
varkha
2017/06/20 19:56:58
nit: s/frame_sink_id/cc::FrameSinkId
gklassen
2017/06/26 21:55:19
Done.
|
+ // are routed to this surface. |
+ cc::FrameSinkId frame_sink_id; |
+ |
+ // Flags to indicate the type of region as defined in |
+ // services/viz/hit_test/public/interfaces/hit_test_data.mojom.h. |
+ uint32_t flags; |
+ |
+ // The rectangle that defines the region. |
+ gfx::Rect rect; |
+ |
+ // The transform applied to the rect. |
+ gfx::Transform transform; |
+ |
+ // The number of children ( including their children ) below this entry. |
+ // If this element is not matched then child_count elements can be skipped |
+ // to move to the next entry. |
+ int child_count; |
+}; |
+ |
+struct DisplayHitTestData { |
+ int length; |
+ base::subtle::Atomic32 read_offset; |
+ DisplayHitTestRegion regions[]; |
+}; |
+ |
+} // namespace viz |
+ |
+#endif // COMPONENTS_VIZ_COMMON_HIT_TEST_DISPLAY_HIT_TEST_DATA_H_ |