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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.
#include "third_party/blink/renderer/platform/graphics/compositor_element_id.h"
#include <limits>
namespace blink {
UniqueObjectId NewUniqueObjectId() {
static UniqueObjectId counter = 0;
return ++counter;
}
static CompositorElementId CreateCompositorElementId(
uint64_t blink_id,
CompositorElementIdNamespace namespace_id) {
DCHECK(blink_id);
DCHECK_LT(blink_id, std::numeric_limits<uint64_t>::max() /
(static_cast<unsigned>(
CompositorElementIdNamespace::kMaxRepresentable)
<< kCompositorReservedBitCount));
// Shift to make room for namespace_id enum bits.
uint64_t id = blink_id << kCompositorNamespaceBitCount;
id += static_cast<uint64_t>(namespace_id);
// Shift for the reserved bit count.
id = id << kCompositorReservedBitCount;
auto result = CompositorElementId(id);
return result;
}
CompositorElementId PLATFORM_EXPORT CompositorElementIdFromUniqueObjectId(
UniqueObjectId id,
CompositorElementIdNamespace namespace_id) {
DCHECK_LE(namespace_id, CompositorElementIdNamespace::kMax);
return CreateCompositorElementId(id, namespace_id);
}
CompositorElementId PLATFORM_EXPORT
CompositorElementIdWithNamespace(CompositorElementId element_id,
CompositorElementIdNamespace namespace_id) {
DCHECK_LE(namespace_id, CompositorElementIdNamespace::kMax);
uint64_t id = element_id.GetInternalValue();
id &= ~((1 << (kCompositorNamespaceBitCount + kCompositorReservedBitCount)) -
1);
id |= static_cast<uint64_t>(namespace_id) << kCompositorReservedBitCount;
return CompositorElementId(id);
}
CompositorElementId PLATFORM_EXPORT
CompositorElementIdFromDOMNodeId(DOMNodeId id) {
DCHECK_GE(id, 0);
return CreateCompositorElementId(id,
CompositorElementIdNamespace::kDOMNodeId);
}
CompositorElementId PLATFORM_EXPORT
CompositorElementIdFromUniqueObjectId(UniqueObjectId id) {
return CreateCompositorElementId(
id, CompositorElementIdNamespace::kUniqueObjectId);
}
CompositorElementIdNamespace NamespaceFromCompositorElementId(
CompositorElementId element_id) {
return static_cast<CompositorElementIdNamespace>(
(element_id.GetInternalValue() >> kCompositorReservedBitCount) %
static_cast<uint64_t>(CompositorElementIdNamespace::kMaxRepresentable));
}
DOMNodeId DOMNodeIdFromCompositorElementId(CompositorElementId element_id) {
DCHECK_EQ(NamespaceFromCompositorElementId(element_id),
CompositorElementIdNamespace::kDOMNodeId);
return static_cast<DOMNodeId>(
element_id.GetInternalValue() >>
(kCompositorNamespaceBitCount + kCompositorReservedBitCount));
}
} // namespace blink
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