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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COMPOSITOR_ELEMENT_ID_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COMPOSITOR_ELEMENT_ID_H_
#include <type_traits>
#include "cc/paint/element_id.h"
#include "third_party/blink/renderer/platform/graphics/dom_node_id.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/hash_traits.h"
namespace blink {
const int kCompositorNamespaceBitCount = 5;
const int kCompositorReservedBitCount = cc::kElementIdReservedBitCount;
// The functions in this header requires cc::ElementId::InternalValue to be
// uint64_t.
static_assert(std::is_same_v<cc::ElementId::InternalValue, uint64_t>);
enum class CompositorElementIdNamespace {
kPrimary,
kUniqueObjectId,
kScroll,
kStickyTranslation,
kAnchorPositionScrollTranslation,
kPrimaryEffect,
kPrimaryTransform,
kEffectFilter,
kEffectMask,
kEffectClipPath,
kScaleTransform,
kRotateTransform,
kTranslateTransform,
kVerticalScrollbar,
kHorizontalScrollbar,
kScrollCorner,
kViewTransitionSubframeRoot,
kViewTransitionElement,
kElementCapture,
kPlaceElement,
kDOMNodeId,
// The following values are for internal usage only.
kMax = kDOMNodeId,
// A sentinel to indicate the maximum representable namespace id
// (the maximum is one less than this value).
kMaxRepresentable = 1 << kCompositorNamespaceBitCount
};
static_assert(CompositorElementIdNamespace::kMax <
CompositorElementIdNamespace::kMaxRepresentable);
using CompositorElementId = cc::ElementId;
using ScrollbarId = uint64_t;
using UniqueObjectId = uint64_t;
using SyntheticEffectId = uint64_t;
// Call this to get a globally unique object id for a newly allocated object.
UniqueObjectId PLATFORM_EXPORT NewUniqueObjectId();
// Call this with an appropriate namespace if more than one CompositorElementId
// is required for the given UniqueObjectId.
CompositorElementId PLATFORM_EXPORT
CompositorElementIdFromUniqueObjectId(UniqueObjectId,
CompositorElementIdNamespace);
// ...and otherwise call this method if there is only one CompositorElementId
// required for the given UniqueObjectId.
CompositorElementId PLATFORM_EXPORT
CompositorElementIdFromUniqueObjectId(UniqueObjectId);
// Returns a CompositorElementId with namespace of `element_id` replaced with
// `namespace_id`.
CompositorElementId PLATFORM_EXPORT
CompositorElementIdWithNamespace(CompositorElementId element_id,
CompositorElementIdNamespace namespace_id);
// TODO(chrishtr): refactor ScrollState to remove this dependency.
CompositorElementId PLATFORM_EXPORT CompositorElementIdFromDOMNodeId(DOMNodeId);
CompositorElementIdNamespace PLATFORM_EXPORT
NamespaceFromCompositorElementId(CompositorElementId);
// Maps a CompositorElementId in the kDOMNodeId namespace back to a DOMNodeId.
DOMNodeId PLATFORM_EXPORT DOMNodeIdFromCompositorElementId(CompositorElementId);
} // namespace blink
namespace WTF {
template <>
struct PLATFORM_EXPORT HashTraits<blink::CompositorElementId>
: GenericHashTraits<blink::CompositorElementId> {
static unsigned GetHash(const blink::CompositorElementId& key) {
// We define a new hash here rather than using `cc::ElementIdHash` since the
// latter produces a `size_t` rather than the `unsigned` needed for
// `WTF::GenericHashTraits<T>::GetHash(const T&)`.
return HashInt(key.GetInternalValue());
}
static constexpr bool kEmptyValueIsZero = true;
static constexpr blink::CompositorElementId EmptyValue() {
return blink::CompositorElementId();
}
static constexpr blink::CompositorElementId DeletedValue() {
return cc::ElementId::DeletedValue();
}
};
} // namespace WTF
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COMPOSITOR_ELEMENT_ID_H_
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