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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZILLA_GFX_COMPOSITORHITTESTINFO_H_
+#define MOZILLA_GFX_COMPOSITORHITTESTINFO_H_
+
+#include "mozilla/EnumSet.h"
+#include "mozilla/EnumTypeTraits.h"
+
+namespace mozilla {
+namespace gfx {
+
+// This set of flags is used to figure out what information a frame has
+// that is relevant to hit-testing in the compositor. The flags are
+// intentionally set up so that if all of them are 0 the item is effectively
+// invisible to hit-testing, and no information for this frame needs to be
+// sent to the compositor.
+// Each enumerator is annotated with the value it contributes to an
+// EnumSet (2 ^ <value of enumerator>), in hexadecimal.
+enum class CompositorHitTestFlags : uint8_t {
+ // The frame participates in hit-testing
+ eVisibleToHitTest = 0, // 0x0001
+
+ // The frame may have odd shapes that requires the main thread to do accurate
+ // hit-testing.
+ eIrregularArea, // 0x0002
+ // The frame has APZ-aware listeners and so inputs targeted at this area
+ // need to be handled by the main thread before APZ can use them, as they
+ // might be prevent-defaulted.
+ eApzAwareListeners, // 0x0004
+ // This is an inactive scrollframe or unlayerized scrollthumb. In this state
+ // it cannot be used by APZ for async scrolling, so APZ will defer to the main
+ // thread.
+ eInactiveScrollframe, // 0x0008
+
+ // The touch action flags are set up so that the default of
+ // touch-action:auto on an element leaves all the flags as 0.
+ eTouchActionPanXDisabled, // 0x0010
+ eTouchActionPanYDisabled, // 0x0020
+ eTouchActionPinchZoomDisabled, // 0x0040
+ eTouchActionAnimatingZoomDisabled, // 0x0080
+
+ // The frame is a scrollbar or a subframe inside a scrollbar (including
+ // scroll thumbs)
+ eScrollbar, // 0x0100
+ // The frame is a scrollthumb. If this is set then eScrollbar will also be
+ // set, unless gecko somehow generates a scroll thumb without a containing
+ // scrollbar.
+ eScrollbarThumb, // 0x0200
+ // If eScrollbar is set, this flag indicates if the scrollbar is a vertical
+ // one (if set) or a horizontal one (if not set)
+ eScrollbarVertical, // 0x0400
+
+ // Events targeting this frame should only be processed if a target
+ // confirmation is received from the main thread. If no such confirmation
+ // is received within a timeout period, the event may be dropped.
+ // Only meaningful in combination with eDispatchToContent.
+ eRequiresTargetConfirmation, // 0x0800
+
+ // Bits 0x1000, 0x2000, 0x4000, and 0x8000 are used by SideBitsPacked in
+ // WebRenderAPI.cpp when we pack SideBits and CompositorHitTestInfo into a
+ // uint16_t and pass in into webrender to store in the item tag.
+
+};
+
+using CompositorHitTestInfo = EnumSet<CompositorHitTestFlags, uint32_t>;
+
+// A CompositorHitTestInfo with none of the flags set
+constexpr CompositorHitTestInfo CompositorHitTestInvisibleToHit;
+
+// Mask to check for all the touch-action flags at once
+constexpr CompositorHitTestInfo CompositorHitTestTouchActionMask(
+ CompositorHitTestFlags::eTouchActionPanXDisabled,
+ CompositorHitTestFlags::eTouchActionPanYDisabled,
+ CompositorHitTestFlags::eTouchActionPinchZoomDisabled,
+ CompositorHitTestFlags::eTouchActionAnimatingZoomDisabled);
+
+// Mask to check all the flags that involve APZ waiting for results from the
+// main thread
+constexpr CompositorHitTestInfo CompositorHitTestDispatchToContent(
+ CompositorHitTestFlags::eIrregularArea,
+ CompositorHitTestFlags::eApzAwareListeners,
+ CompositorHitTestFlags::eInactiveScrollframe);
+
+} // namespace gfx
+
+// Used for IPDL serialization. The 'value' have to be the biggest enum from
+// CompositorHitTestFlags.
+template <>
+struct MaxEnumValue<::mozilla::gfx::CompositorHitTestFlags> {
+ static constexpr unsigned int value = static_cast<unsigned int>(
+ gfx::CompositorHitTestFlags::eRequiresTargetConfirmation);
+};
+
+namespace gfx {
+
+// Checks if the CompositorHitTestFlags max enum value is less than N.
+template <int N>
+static constexpr bool DoesCompositorHitTestInfoFitIntoBits() {
+ if (MaxEnumValue<CompositorHitTestInfo::valueType>::value < N) {
+ return true;
+ }
+
+ return false;
+}
+} // namespace gfx
+
+} // namespace mozilla
+
+#endif /* MOZILLA_GFX_COMPOSITORHITTESTINFO_H_ */