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 "include/core/SkFontMgr.h" 12 #include "include/core/SkM44.h" 13 #include "include/core/SkPaint.h" 14 #include "include/core/SkPath.h" 15 #include "include/core/SkRect.h" 16 #include "include/core/SkSize.h" 17 #include "include/core/SkTypes.h" 18 #include "modules/skresources/include/SkResources.h" 19 #include "modules/svg/include/SkSVGAttribute.h" 20 #include "modules/svg/include/SkSVGIDMapper.h" 21 #include "src/core/SkTLazy.h" 22 23 class SkCanvas; 24 class SkSVGLength; 25 26 class SkSVGLengthContext { 27 public: 28 SkSVGLengthContext(const SkSize& viewport, SkScalar dpi = 90) fViewport(viewport)29 : fViewport(viewport), fDPI(dpi) {} 30 31 enum class LengthType { 32 kHorizontal, 33 kVertical, 34 kOther, 35 }; 36 viewPort()37 const SkSize& viewPort() const { return fViewport; } setViewPort(const SkSize & viewport)38 void setViewPort(const SkSize& viewport) { fViewport = viewport; } 39 40 SkScalar resolve(const SkSVGLength&, LengthType) const; 41 SkRect resolveRect(const SkSVGLength& x, const SkSVGLength& y, 42 const SkSVGLength& w, const SkSVGLength& h) const; 43 44 private: 45 SkSize fViewport; 46 SkScalar fDPI; 47 }; 48 49 struct SkSVGPresentationContext { 50 SkSVGPresentationContext(); 51 SkSVGPresentationContext(const SkSVGPresentationContext&) = default; 52 SkSVGPresentationContext& operator=(const SkSVGPresentationContext&) = default; 53 54 // Inherited presentation attributes, computed for the current node. 55 SkSVGPresentationAttributes fInherited; 56 }; 57 58 class SkSVGRenderContext { 59 public: 60 // Captures data required for object bounding box resolution. 61 struct OBBScope { 62 const SkSVGNode* fNode; 63 const SkSVGRenderContext* fCtx; 64 }; 65 66 SkSVGRenderContext(SkCanvas*, const sk_sp<SkFontMgr>&, 67 const sk_sp<skresources::ResourceProvider>&, const SkSVGIDMapper&, 68 const SkSVGLengthContext&, const SkSVGPresentationContext&, 69 const OBBScope&); 70 SkSVGRenderContext(const SkSVGRenderContext&); 71 SkSVGRenderContext(const SkSVGRenderContext&, SkCanvas*); 72 // Establish a new OBB scope. Normally used when entering a node's render scope. 73 SkSVGRenderContext(const SkSVGRenderContext&, const SkSVGNode*); 74 ~SkSVGRenderContext(); 75 lengthContext()76 const SkSVGLengthContext& lengthContext() const { return *fLengthContext; } writableLengthContext()77 SkSVGLengthContext* writableLengthContext() { return fLengthContext.writable(); } 78 presentationContext()79 const SkSVGPresentationContext& presentationContext() const { return *fPresentationContext; } 80 canvas()81 SkCanvas* canvas() const { return fCanvas; } 82 void saveOnce(); 83 84 enum ApplyFlags { 85 kLeaf = 1 << 0, // the target node doesn't have descendants 86 }; 87 void applyPresentationAttributes(const SkSVGPresentationAttributes&, uint32_t flags); 88 89 // Scoped wrapper that temporarily clears the original node reference. 90 class BorrowedNode { 91 public: BorrowedNode(sk_sp<SkSVGNode> * node)92 explicit BorrowedNode(sk_sp<SkSVGNode>* node) 93 : fOwner(node) { 94 if (fOwner) { 95 fBorrowed = std::move(*fOwner); 96 *fOwner = nullptr; 97 } 98 } 99 100 // Required until C++17 copy elision 101 BorrowedNode(BorrowedNode&&) = default; 102 ~BorrowedNode()103 ~BorrowedNode() { 104 if (fOwner) { 105 *fOwner = std::move(fBorrowed); 106 } 107 } 108 get()109 const SkSVGNode* get() const { return fBorrowed.get(); } 110 const SkSVGNode* operator->() const { return fBorrowed.get(); } 111 const SkSVGNode& operator*() const { return *fBorrowed; } 112 113 operator bool() const { return !!fBorrowed; } 114 115 private: 116 // noncopyable 117 BorrowedNode(const BorrowedNode&) = delete; 118 BorrowedNode& operator=(BorrowedNode&) = delete; 119 120 sk_sp<SkSVGNode>* fOwner; 121 sk_sp<SkSVGNode> fBorrowed; 122 }; 123 124 // Note: the id->node association is cleared for the lifetime of the returned value 125 // (effectively breaks reference cycles, assuming appropriate return value scoping). 126 BorrowedNode findNodeById(const SkSVGIRI&) const; 127 128 SkTLazy<SkPaint> fillPaint() const; 129 SkTLazy<SkPaint> strokePaint() const; 130 131 SkSVGColorType resolveSvgColor(const SkSVGColor&) const; 132 133 // The local computed clip path (not inherited). clipPath()134 const SkPath* clipPath() const { return fClipPath.getMaybeNull(); } 135 resourceProvider()136 const sk_sp<skresources::ResourceProvider>& resourceProvider() const { 137 return fResourceProvider; 138 } 139 fontMgr()140 sk_sp<SkFontMgr> fontMgr() const { 141 return fFontMgr ? fFontMgr : SkFontMgr::RefDefault(); 142 } 143 144 // Returns the translate/scale transformation required to map into the current OBB scope, 145 // with the specified units. 146 struct OBBTransform { 147 SkV2 offset, scale; 148 }; 149 OBBTransform transformForCurrentOBB(SkSVGObjectBoundingBoxUnits) const; 150 151 SkRect resolveOBBRect(const SkSVGLength& x, const SkSVGLength& y, 152 const SkSVGLength& w, const SkSVGLength& h, 153 SkSVGObjectBoundingBoxUnits) const; 154 155 private: 156 // Stack-only 157 void* operator new(size_t) = delete; 158 void* operator new(size_t, void*) = delete; 159 SkSVGRenderContext& operator=(const SkSVGRenderContext&) = delete; 160 161 void applyOpacity(SkScalar opacity, uint32_t flags, bool hasFilter); 162 void applyFilter(const SkSVGFuncIRI&); 163 void applyClip(const SkSVGFuncIRI&); 164 void applyMask(const SkSVGFuncIRI&); 165 166 SkTLazy<SkPaint> commonPaint(const SkSVGPaint&, float opacity) const; 167 168 const sk_sp<SkFontMgr>& fFontMgr; 169 const sk_sp<skresources::ResourceProvider>& fResourceProvider; 170 const SkSVGIDMapper& fIDMapper; 171 SkTCopyOnFirstWrite<SkSVGLengthContext> fLengthContext; 172 SkTCopyOnFirstWrite<SkSVGPresentationContext> fPresentationContext; 173 SkCanvas* fCanvas; 174 // The save count on 'fCanvas' at construction time. 175 // A restoreToCount() will be issued on destruction. 176 int fCanvasSaveCount; 177 178 // clipPath, if present for the current context (not inherited). 179 SkTLazy<SkPath> fClipPath; 180 181 // Deferred opacity optimization for leaf nodes. 182 float fDeferredPaintOpacity = 1; 183 184 // Current object bounding box scope. 185 const OBBScope fOBBScope; 186 }; 187 188 #endif // SkSVGRenderContext_DEFINED 189