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// Copyright 2016 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.
#include "third_party/blink/renderer/platform/graphics/compositor_element_id.h"
namespace blink {
UniqueObjectId NewUniqueObjectId() {
static UniqueObjectId counter = 0;
return ++counter;
}
static CompositorElementId CreateCompositorElementId(
uint64_t blink_id,
CompositorElementIdNamespace namespace_id) {
DCHECK(
blink_id > 0 &&
blink_id <
std::numeric_limits<uint64_t>::max() /
static_cast<unsigned>(
CompositorElementIdNamespace::kMaxRepresentableNamespaceId));
// Shift to make room for namespace_id enum bits.
cc::ElementIdType id = blink_id << kCompositorNamespaceBitCount;
id += static_cast<uint64_t>(namespace_id);
return CompositorElementId(id);
}
CompositorElementId PLATFORM_EXPORT CompositorElementIdFromUniqueObjectId(
UniqueObjectId id,
CompositorElementIdNamespace namespace_id) {
DCHECK(namespace_id == CompositorElementIdNamespace::kPrimary ||
namespace_id == CompositorElementIdNamespace::kScroll ||
namespace_id == CompositorElementIdNamespace::kEffectFilter ||
namespace_id == CompositorElementIdNamespace::kEffectMask ||
namespace_id == CompositorElementIdNamespace::kEffectClipPath ||
namespace_id == CompositorElementIdNamespace::kVerticalScrollbar ||
namespace_id == CompositorElementIdNamespace::kHorizontalScrollbar);
return CreateCompositorElementId(id, namespace_id);
}
CompositorElementId PLATFORM_EXPORT
CompositorElementIdFromDOMNodeId(DOMNodeId id) {
return CreateCompositorElementId(
id, CompositorElementIdNamespace::kUniqueObjectId);
}
CompositorElementId PLATFORM_EXPORT
CompositorElementIdFromUniqueObjectId(UniqueObjectId id) {
return CreateCompositorElementId(
id, CompositorElementIdNamespace::kUniqueObjectId);
}
CompositorElementIdNamespace NamespaceFromCompositorElementId(
CompositorElementId element_id) {
return static_cast<CompositorElementIdNamespace>(
element_id.GetInternalValue() %
static_cast<uint64_t>(
CompositorElementIdNamespace::kMaxRepresentableNamespaceId));
}
} // namespace blink
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