SkSVGText.h

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/*
 * Copyright 2019 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef SkSVGText_DEFINED
#define SkSVGText_DEFINED
 
#include <vector>
 
#include "modules/svg/include/SkSVGTransformableNode.h"
#include "modules/svg/include/SkSVGTypes.h"
 
class SK_API SkSVGTextContext;
 
// Base class for text-rendering nodes.
class SkSVGTextFragment : public SkSVGTransformableNode {
public:
    void renderText(const SkSVGRenderContext&, SkSVGTextContext*, SkSVGXmlSpace) const;
 
protected:
    explicit SkSVGTextFragment(SkSVGTag t) : INHERITED(t) {}
 
    virtual void onShapeText(const SkSVGRenderContext&, SkSVGTextContext*, SkSVGXmlSpace) const = 0;
 
    // Text nodes other than the root <text> element are not rendered directly.
    void onRender(const SkSVGRenderContext&) const override {}
 
private:
    SkPath onAsPath(const SkSVGRenderContext&) const override;
 
    using INHERITED = SkSVGTransformableNode;
};
 
// Base class for nestable text containers (<text>, <tspan>, etc).
class SkSVGTextContainer : public SkSVGTextFragment {
public:
    SVG_ATTR(X, std::vector<SkSVGLength>, {})
    SVG_ATTR(Y, std::vector<SkSVGLength>, {})
    SVG_ATTR(Dx, std::vector<SkSVGLength>, {})
    SVG_ATTR(Dy, std::vector<SkSVGLength>, {})
    SVG_ATTR(Rotate, std::vector<SkSVGNumberType>, {})
 
    SVG_ATTR(XmlSpace, SkSVGXmlSpace, SkSVGXmlSpace::kDefault)
 
    void appendChild(sk_sp<SkSVGNode>) final;
 
protected:
    explicit SkSVGTextContainer(SkSVGTag t) : INHERITED(t) {}
 
    void onShapeText(const SkSVGRenderContext&, SkSVGTextContext*, SkSVGXmlSpace) const override;
 
    bool parseAndSetAttribute(const char*, const char*) override;
 
private:
    std::vector<sk_sp<SkSVGTextFragment>> fChildren;
 
    using INHERITED = SkSVGTextFragment;
};
 
class SkSVGText final : public SkSVGTextContainer {
public:
    static sk_sp<SkSVGText> Make() { return sk_sp<SkSVGText>(new SkSVGText()); }
 
private:
    SkSVGText() : INHERITED(SkSVGTag::kText) {}
 
    void onRender(const SkSVGRenderContext&) const override;
 
    SkRect onObjectBoundingBox(const SkSVGRenderContext&) const override;
    SkPath onAsPath(const SkSVGRenderContext&) const override;
 
    using INHERITED = SkSVGTextContainer;
};
 
class SkSVGTSpan final : public SkSVGTextContainer {
public:
    static sk_sp<SkSVGTSpan> Make() { return sk_sp<SkSVGTSpan>(new SkSVGTSpan()); }
 
private:
    SkSVGTSpan() : INHERITED(SkSVGTag::kTSpan) {}
 
    using INHERITED = SkSVGTextContainer;
};
 
class SkSVGTextLiteral final : public SkSVGTextFragment {
public:
    static sk_sp<SkSVGTextLiteral> Make() {
        return sk_sp<SkSVGTextLiteral>(new SkSVGTextLiteral());
    }
 
    SVG_ATTR(Text, SkSVGStringType, SkSVGStringType())
 
private:
    SkSVGTextLiteral() : INHERITED(SkSVGTag::kTextLiteral) {}
 
    void onShapeText(const SkSVGRenderContext&, SkSVGTextContext*, SkSVGXmlSpace) const override;
 
    void appendChild(sk_sp<SkSVGNode>) override {}
 
    using INHERITED = SkSVGTextFragment;
};
 
class SkSVGTextPath final : public SkSVGTextContainer {
public:
    static sk_sp<SkSVGTextPath> Make() { return sk_sp<SkSVGTextPath>(new SkSVGTextPath()); }
 
    SVG_ATTR(Href       , SkSVGIRI   , {}  )
    SVG_ATTR(StartOffset, SkSVGLength, SkSVGLength(0))
 
private:
    SkSVGTextPath() : INHERITED(SkSVGTag::kTextPath) {}
 
    void onShapeText(const SkSVGRenderContext&, SkSVGTextContext*, SkSVGXmlSpace) const override;
    bool parseAndSetAttribute(const char*, const char*) override;
 
    using INHERITED = SkSVGTextContainer;
};
 
#endif  // SkSVGText_DEFINED