/*

 * Copyright 2017 Google Inc.

 *

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

 * found in the LICENSE file.

 */

#ifndef SkSVGGradient_DEFINED

#define SkSVGGradient_DEFINED

#include "include/core/SkShader.h"

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

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

class SkMatrix;

class SkSVGRenderContext;

class SkSVGStop;

class SkSVGGradient : public SkSVGHiddenContainer {

public:

    SVG_ATTR(Href, SkSVGIRI, SkSVGIRI())

    SVG_ATTR(GradientTransform, SkSVGTransformType, SkSVGTransformType(SkMatrix::I()))

    SVG_ATTR(SpreadMethod, SkSVGSpreadMethod, SkSVGSpreadMethod(SkSVGSpreadMethod::Type::kPad))

    SVG_ATTR(GradientUnits,

             SkSVGObjectBoundingBoxUnits,

             SkSVGObjectBoundingBoxUnits(SkSVGObjectBoundingBoxUnits::Type::kObjectBoundingBox))

protected:

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

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

    bool onAsPaint(const SkSVGRenderContext&, SkPaint*) const final;

    virtual sk_sp<SkShader> onMakeShader(const SkSVGRenderContext&,

                                         const SkColor4f*, const SkScalar*, int count,

                                         SkTileMode, const SkMatrix& localMatrix) const = 0;

private:

    using StopPositionArray = SkSTArray<2, SkScalar , true>;

    using    StopColorArray = SkSTArray<2, SkColor4f, true>;

    void collectColorStops(const SkSVGRenderContext&, StopPositionArray*, StopColorArray*) const;

    SkColor4f resolveStopColor(const SkSVGRenderContext&, const SkSVGStop&) const;

    using INHERITED = SkSVGHiddenContainer;

};

#endif // SkSVGGradient_DEFINED