Source/WebCore/rendering/CSSFilter.h

/*
 * Copyright (C) 2011-2022 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 */

#pragma once

#include "Filter.h"
#include "LengthBox.h"

namespace WebCore {

class FilterOperations;
class GraphicsContext;
class RenderElement;
class SourceGraphic;

class CSSFilter final : public Filter {
    WTF_MAKE_FAST_ALLOCATED;
public:
    static RefPtr<CSSFilter> create(RenderElement&, const FilterOperations&, RenderingMode, const FloatSize& filterScale, ClipOperation, const FloatRect& targetBoundingBox, const GraphicsContext& destinationContext);
    WEBCORE_EXPORT static RefPtr<CSSFilter> create(Vector<Ref<FilterFunction>>&&);

    const Vector<Ref<FilterFunction>>& functions() const { return m_functions; }

    void setFilterRegion(const FloatRect&);

    bool hasFilterThatMovesPixels() const { return m_hasFilterThatMovesPixels; }
    bool hasFilterThatShouldBeRestrictedBySecurityOrigin() const { return m_hasFilterThatShouldBeRestrictedBySecurityOrigin; }

    FilterEffectVector effectsOfType(FilterFunction::Type) const final;

    RefPtr<FilterImage> apply(FilterImage* sourceImage, FilterResults&) final;

    static IntOutsets calculateOutsets(RenderElement&, const FilterOperations&, const FloatRect& targetBoundingBox);

private:
    CSSFilter(RenderingMode, const FloatSize& filterScale, ClipOperation, bool hasFilterThatMovesPixels, bool hasFilterThatShouldBeRestrictedBySecurityOrigin);
    CSSFilter(Vector<Ref<FilterFunction>>&&);

    bool buildFilterFunctions(RenderElement&, const FilterOperations&, const FloatRect& targetBoundingBox, const GraphicsContext& destinationContext);

    bool supportsAcceleratedRendering() const final;

    WTF::TextStream& externalRepresentation(WTF::TextStream&, FilterRepresentation) const final;

    bool m_hasFilterThatMovesPixels { false };
    bool m_hasFilterThatShouldBeRestrictedBySecurityOrigin { false };

    Vector<Ref<FilterFunction>> m_functions;
};

} // namespace WebCore

SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::CSSFilter)
    static bool isType(const WebCore::Filter& filter) { return filter.isCSSFilter(); }
SPECIALIZE_TYPE_TRAITS_END()