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// Copyright 2018 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 THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSSOM_PAINT_WORKLET_STYLE_PROPERTY_MAP_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSSOM_PAINT_WORKLET_STYLE_PROPERTY_MAP_H_
#include <memory>
#include "third_party/blink/renderer/core/css/cssom/cross_thread_style_value.h"
#include "third_party/blink/renderer/core/css/cssom/style_property_map_read_only.h"
#include "third_party/blink/renderer/platform/graphics/compositor_element_id.h"
#include "third_party/blink/renderer/platform/graphics/platform_paint_worklet_layer_painter.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class ComputedStyle;
// This class is designed for CSS Paint such that it can be safely passed cross
// threads.
//
// Here is a typical usage.
// At CSSPaintValue::GetImage which is on the main thread, call the
// BuildCrossThreadData and give the data to the Blink::PaintWorkletInput.
// The PaintWorkletInput is passed to the worklet thread, and we build an
// instance of PaintWorkletStylePropertyMap from the data, and the instance is
// eventually pass to the JS paint callback.
class CORE_EXPORT PaintWorkletStylePropertyMap
: public StylePropertyMapReadOnly {
public:
using StylePropertyMapEntry = std::pair<String, CSSStyleValueVector>;
using CrossThreadData =
HashMap<String, std::unique_ptr<CrossThreadStyleValue>>;
// Build the data that will be passed to the worklet thread to construct a
// style map. Should be called on the main thread only.
// TODO(xidachen): consider making the input_property_ids as part of the
// return value. Or make both CrossThreadData and input_property_ids as
// params and return a bool.
static absl::optional<CrossThreadData> BuildCrossThreadData(
const Document&,
UniqueObjectId unique_object_id,
const ComputedStyle&,
const Vector<CSSPropertyID>& native_properties,
const Vector<AtomicString>& custom_properties,
CompositorPaintWorkletInput::PropertyKeys& input_property_keys);
static CrossThreadData CopyCrossThreadData(const CrossThreadData& data);
// This constructor should be called on the worklet-thread only.
explicit PaintWorkletStylePropertyMap(CrossThreadData data);
PaintWorkletStylePropertyMap(const PaintWorkletStylePropertyMap&) = delete;
PaintWorkletStylePropertyMap& operator=(const PaintWorkletStylePropertyMap&) =
delete;
CSSStyleValue* get(const ExecutionContext*,
const String& property_name,
ExceptionState&) const override;
CSSStyleValueVector getAll(const ExecutionContext*,
const String& property_name,
ExceptionState&) const override;
bool has(const ExecutionContext*,
const String& property_name,
ExceptionState&) const override;
unsigned int size() const override;
void Trace(Visitor*) const override;
const CrossThreadData& StyleMapDataForTest() const { return data_; }
CrossThreadData& StyleMapData() { return data_; }
private:
IterationSource* StartIteration(ScriptState*, ExceptionState&) override;
CrossThreadData data_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSSOM_PAINT_WORKLET_STYLE_PROPERTY_MAP_H_
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