/*
 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
 * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
 * Copyright (C) 2021-2023 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#pragma once

#include "FEConvolveMatrix.h"
#include "FilterEffect.h"

namespace WebCore {

class FEGaussianBlur final : public FilterEffect {
    WTF_DEPRECATED_MAKE_FAST_ALLOCATED(FEGaussianBlur);
    WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(FEGaussianBlur);
public:
    WEBCORE_EXPORT static Ref<FEGaussianBlur> create(float x, float y, EdgeModeType, DestinationColorSpace = DestinationColorSpace::SRGB());

    bool operator==(const FEGaussianBlur&) const;

    float stdDeviationX() const { return m_stdX; }
    bool setStdDeviationX(float);

    float stdDeviationY() const { return m_stdY; }
    bool setStdDeviationY(float);

    EdgeModeType edgeMode() const { return m_edgeMode; }
    bool setEdgeMode(EdgeModeType);

    static IntSize calculateKernelSize(const Filter&, FloatSize stdDeviation);
    static IntSize calculateUnscaledKernelSize(FloatSize stdDeviation);
    static IntSize calculateOutsetSize(FloatSize stdDeviation);

    static IntOutsets calculateOutsets(const FloatSize& stdDeviation);

private:
    FEGaussianBlur(float x, float y, EdgeModeType, DestinationColorSpace);

    bool operator==(const FilterEffect& other) const override { return areEqual<FEGaussianBlur>(*this, other); }

    FloatRect calculateImageRect(const Filter&, std::span<const FloatRect> inputImageRects, const FloatRect& primitiveSubregion) const override;

    bool resultIsAlphaImage(std::span<const Ref<FilterImage>> inputs) const override;

    OptionSet<FilterRenderingMode> supportedFilterRenderingModes() const override;

    std::unique_ptr<FilterEffectApplier> createAcceleratedApplier() const override;
    std::unique_ptr<FilterEffectApplier> createSoftwareApplier() const override;
    std::optional<GraphicsStyle> createGraphicsStyle(GraphicsContext&, const Filter&) const override;

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

    float m_stdX;
    float m_stdY;
    EdgeModeType m_edgeMode;
};

} // namespace WebCore

SPECIALIZE_TYPE_TRAITS_FILTER_FUNCTION(FEGaussianBlur)
