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 SkSVGRenderContext_DEFINED 9 #define SkSVGRenderContext_DEFINED 10 11 #include "SkPaint.h" 12 #include "SkPath.h" 13 #include "SkRect.h" 14 #include "SkSize.h" 15 #include "SkSVGAttribute.h" 16 #include "SkSVGIDMapper.h" 17 #include "SkTLazy.h" 18 #include "SkTypes.h" 19 20 class SkCanvas; 21 class SkSVGLength; 22 23 class SkSVGLengthContext { 24 public: 25 SkSVGLengthContext(const SkSize& viewport, SkScalar dpi = 90) fViewport(viewport)26 : fViewport(viewport), fDPI(dpi) {} 27 28 enum class LengthType { 29 kHorizontal, 30 kVertical, 31 kOther, 32 }; 33 viewPort()34 const SkSize& viewPort() const { return fViewport; } setViewPort(const SkSize & viewport)35 void setViewPort(const SkSize& viewport) { fViewport = viewport; } 36 37 SkScalar resolve(const SkSVGLength&, LengthType) const; 38 SkRect resolveRect(const SkSVGLength& x, const SkSVGLength& y, 39 const SkSVGLength& w, const SkSVGLength& h) const; 40 41 private: 42 SkSize fViewport; 43 SkScalar fDPI; 44 }; 45 46 struct SkSVGPresentationContext { 47 SkSVGPresentationContext(); 48 SkSVGPresentationContext(const SkSVGPresentationContext&) = default; 49 SkSVGPresentationContext& operator=(const SkSVGPresentationContext&) = default; 50 51 // Inherited presentation attributes, computed for the current node. 52 SkSVGPresentationAttributes fInherited; 53 54 // Cached paints, reflecting the current presentation attributes. 55 SkPaint fFillPaint; 56 SkPaint fStrokePaint; 57 }; 58 59 class SkSVGRenderContext { 60 public: 61 SkSVGRenderContext(SkCanvas*, const SkSVGIDMapper&, const SkSVGLengthContext&, 62 const SkSVGPresentationContext&); 63 SkSVGRenderContext(const SkSVGRenderContext&); 64 SkSVGRenderContext(const SkSVGRenderContext&, SkCanvas*); 65 ~SkSVGRenderContext(); 66 lengthContext()67 const SkSVGLengthContext& lengthContext() const { return *fLengthContext; } writableLengthContext()68 SkSVGLengthContext* writableLengthContext() { return fLengthContext.writable(); } 69 presentationContext()70 const SkSVGPresentationContext& presentationContext() const { return *fPresentationContext; } 71 canvas()72 SkCanvas* canvas() const { return fCanvas; } 73 void saveOnce(); 74 75 enum ApplyFlags { 76 kLeaf = 1 << 0, // the target node doesn't have descendants 77 }; 78 void applyPresentationAttributes(const SkSVGPresentationAttributes&, uint32_t flags); 79 80 const SkSVGNode* findNodeById(const SkString&) const; 81 82 const SkPaint* fillPaint() const; 83 const SkPaint* strokePaint() const; 84 85 // The local computed clip path (not inherited). clipPath()86 const SkPath* clipPath() const { return fClipPath.getMaybeNull(); } 87 88 private: 89 // Stack-only 90 void* operator new(size_t) = delete; 91 void* operator new(size_t, void*) = delete; 92 SkSVGRenderContext& operator=(const SkSVGRenderContext&) = delete; 93 94 void applyOpacity(SkScalar opacity, uint32_t flags); 95 void applyClip(const SkSVGClip&); 96 97 const SkSVGIDMapper& fIDMapper; 98 SkTCopyOnFirstWrite<SkSVGLengthContext> fLengthContext; 99 SkTCopyOnFirstWrite<SkSVGPresentationContext> fPresentationContext; 100 SkCanvas* fCanvas; 101 // The save count on 'fCanvas' at construction time. 102 // A restoreToCount() will be issued on destruction. 103 int fCanvasSaveCount; 104 105 // clipPath, if present for the current context (not inherited). 106 SkTLazy<SkPath> fClipPath; 107 }; 108 109 #endif // SkSVGRenderContext_DEFINED 110