/*

 * Copyright 2020 Google Inc.

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#ifndef SkSVGFe_DEFINED

#define SkSVGFe_DEFINED

#include "include/core/SkRect.h"

#include "include/core/SkRefCnt.h"

#include "include/private/base/SkAPI.h"

#include "modules/svg/include/SkSVGHiddenContainer.h"

#include "modules/svg/include/SkSVGNode.h"

#include "modules/svg/include/SkSVGTypes.h"

#include "src/base/SkTLazy.h"

#include <vector>

class SkImageFilter;

class SkSVGFilterContext;

class SkSVGRenderContext;

class SK_API SkSVGFe : public SkSVGHiddenContainer {

public:

    static bool IsFilterEffect(const sk_sp<SkSVGNode>& node) {

        switch (node->tag()) {

            case SkSVGTag::kFeBlend:

            case SkSVGTag::kFeColorMatrix:

            case SkSVGTag::kFeComponentTransfer:

            case SkSVGTag::kFeComposite:

            case SkSVGTag::kFeDiffuseLighting:

            case SkSVGTag::kFeDisplacementMap:

            case SkSVGTag::kFeFlood:

            case SkSVGTag::kFeGaussianBlur:

            case SkSVGTag::kFeImage:

            case SkSVGTag::kFeMerge:

            case SkSVGTag::kFeMorphology:

            case SkSVGTag::kFeOffset:

            case SkSVGTag::kFeSpecularLighting:

            case SkSVGTag::kFeTurbulence:

                return true;

            default:

                return false;

        }

    }

    sk_sp<SkImageFilter> makeImageFilter(const SkSVGRenderContext& ctx,

                                         const SkSVGFilterContext& fctx) const;

    // https://www.w3.org/TR/SVG11/filters.html#FilterPrimitiveSubRegion

    SkRect resolveFilterSubregion(const SkSVGRenderContext&, const SkSVGFilterContext&) const;

    /**

     * Resolves the colorspace within which this filter effect should be applied.

     * Spec: https://www.w3.org/TR/SVG11/painting.html#ColorInterpolationProperties

     * 'color-interpolation-filters' property.

     */

    virtual SkSVGColorspace resolveColorspace(const SkSVGRenderContext&,

                                              const SkSVGFilterContext&) const;

    /** Propagates any inherited presentation attributes in the given context. */

    void applyProperties(SkSVGRenderContext*) const;

    SVG_ATTR(In, SkSVGFeInputType, SkSVGFeInputType())

    SVG_ATTR(Result, SkSVGStringType, SkSVGStringType())

    SVG_OPTIONAL_ATTR(X, SkSVGLength)

    SVG_OPTIONAL_ATTR(Y, SkSVGLength)

    SVG_OPTIONAL_ATTR(Width, SkSVGLength)

    SVG_OPTIONAL_ATTR(Height, SkSVGLength)

protected:

    explicit SkSVGFe(SkSVGTag t) : INHERITED(t) {}

    virtual sk_sp<SkImageFilter> onMakeImageFilter(const SkSVGRenderContext&,

                                                   const SkSVGFilterContext&) const = 0;

    virtual std::vector<SkSVGFeInputType> getInputs() const = 0;

    bool parseAndSetAttribute(const char*, const char*) override;

private:

    /**

     * Resolves the rect specified by the x, y, width and height attributes (if specified) on this

     * filter effect. These attributes are resolved according to the given length context and

     * the value of 'primitiveUnits' on the parent <filter> element.

     */

    SkRect resolveBoundaries(const SkSVGRenderContext&, const SkSVGFilterContext&) const;

    using INHERITED = SkSVGHiddenContainer;

};

#endif  // SkSVGFe_DEFINED