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      1 /*
      2  * Copyright 2016 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef SkSVGNode_DEFINED
      9 #define SkSVGNode_DEFINED
     10 
     11 #include "SkRefCnt.h"
     12 #include "SkSVGAttribute.h"
     13 
     14 class SkCanvas;
     15 class SkMatrix;
     16 class SkPaint;
     17 class SkPath;
     18 class SkSVGRenderContext;
     19 class SkSVGValue;
     20 
     21 enum class SkSVGTag {
     22     kCircle,
     23     kClipPath,
     24     kDefs,
     25     kEllipse,
     26     kG,
     27     kLine,
     28     kLinearGradient,
     29     kPath,
     30     kPattern,
     31     kPolygon,
     32     kPolyline,
     33     kRadialGradient,
     34     kRect,
     35     kStop,
     36     kSvg,
     37     kUse
     38 };
     39 
     40 class SkSVGNode : public SkRefCnt {
     41 public:
     42     virtual ~SkSVGNode();
     43 
     44     SkSVGTag tag() const { return fTag; }
     45 
     46     virtual void appendChild(sk_sp<SkSVGNode>) = 0;
     47 
     48     void render(const SkSVGRenderContext&) const;
     49     bool asPaint(const SkSVGRenderContext&, SkPaint*) const;
     50     SkPath asPath(const SkSVGRenderContext&) const;
     51 
     52     void setAttribute(SkSVGAttribute, const SkSVGValue&);
     53 
     54     void setClipPath(const SkSVGClip&);
     55     void setClipRule(const SkSVGFillRule&);
     56     void setFill(const SkSVGPaint&);
     57     void setFillOpacity(const SkSVGNumberType&);
     58     void setFillRule(const SkSVGFillRule&);
     59     void setOpacity(const SkSVGNumberType&);
     60     void setStroke(const SkSVGPaint&);
     61     void setStrokeDashArray(const SkSVGDashArray&);
     62     void setStrokeDashOffset(const SkSVGLength&);
     63     void setStrokeOpacity(const SkSVGNumberType&);
     64     void setStrokeWidth(const SkSVGLength&);
     65     void setVisibility(const SkSVGVisibility&);
     66 
     67 protected:
     68     SkSVGNode(SkSVGTag);
     69 
     70     // Called before onRender(), to apply local attributes to the context.  Unlike onRender(),
     71     // onPrepareToRender() bubbles up the inheritance chain: overriders should always call
     72     // INHERITED::onPrepareToRender(), unless they intend to short-circuit rendering
     73     // (return false).
     74     // Implementations are expected to return true if rendering is to continue, or false if
     75     // the node/subtree rendering is disabled.
     76     virtual bool onPrepareToRender(SkSVGRenderContext*) const;
     77 
     78     virtual void onRender(const SkSVGRenderContext&) const = 0;
     79 
     80     virtual bool onAsPaint(const SkSVGRenderContext&, SkPaint*) const { return false; }
     81 
     82     virtual SkPath onAsPath(const SkSVGRenderContext&) const = 0;
     83 
     84     virtual void onSetAttribute(SkSVGAttribute, const SkSVGValue&);
     85 
     86     virtual bool hasChildren() const { return false; }
     87 
     88 private:
     89     SkSVGTag                    fTag;
     90 
     91     // FIXME: this should be sparse
     92     SkSVGPresentationAttributes fPresentationAttributes;
     93 
     94     typedef SkRefCnt INHERITED;
     95 };
     96 
     97 #endif // SkSVGNode_DEFINED
     98