1 /* 2 * Copyright (C) 2011 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SkPDFDevice_DEFINED 18 #define SkPDFDevice_DEFINED 19 20 #include "SkCanvas.h" 21 #include "SkDevice.h" 22 #include "SkPaint.h" 23 #include "SkPath.h" 24 #include "SkRefCnt.h" 25 #include "SkStream.h" 26 #include "SkTScopedPtr.h" 27 28 class SkPDFArray; 29 class SkPDFDevice; 30 class SkPDFDict; 31 class SkPDFFont; 32 class SkPDFFormXObject; 33 class SkPDFGraphicState; 34 class SkPDFObject; 35 class SkPDFShader; 36 class SkPDFStream; 37 38 // Private classes. 39 struct ContentEntry; 40 struct GraphicStateEntry; 41 42 class SkPDFDeviceFactory : public SkDeviceFactory { 43 public: 44 virtual SkDevice* newDevice(SkCanvas*, SkBitmap::Config, int width, 45 int height, bool isOpaque, bool isForLayer); 46 }; 47 48 /** \class SkPDFDevice 49 50 The drawing context for the PDF backend. 51 */ 52 class SkPDFDevice : public SkDevice { 53 public: 54 /** Create a PDF drawing context with the given width and height. 55 * 72 points/in means letter paper is 612x792. 56 * @param pageSize Page size in points. 57 * @param contentSize The content size of the page in points. This will be 58 * combined with the initial transform to determine the drawing area 59 * (as reported by the width and height methods). Anything outside 60 * of the drawing area will be clipped. 61 * @param initialTransform The initial transform to apply to the page. 62 * This may be useful to, for example, move the origin in and 63 * over a bit to account for a margin, scale the canvas, 64 * or apply a rotation. Note1: the SkPDFDevice also applies 65 * a scale+translate transform to move the origin from the 66 * bottom left (PDF default) to the top left. Note2: drawDevice 67 * (used by layer restore) draws the device after this initial 68 * transform is applied, so the PDF device factory does an 69 * inverse scale+translate to accommodate the one that SkPDFDevice 70 * always does. 71 */ 72 // TODO(vandebo) The sizes should be SkSize and not SkISize. 73 SK_API SkPDFDevice(const SkISize& pageSize, const SkISize& contentSize, 74 const SkMatrix& initialTransform); 75 SK_API virtual ~SkPDFDevice(); 76 getDeviceCapabilities()77 virtual uint32_t getDeviceCapabilities() { return kVector_Capability; } 78 79 virtual void clear(SkColor color); 80 readPixels(const SkIRect & srcRect,SkBitmap * bitmap)81 virtual bool readPixels(const SkIRect& srcRect, SkBitmap* bitmap) { 82 return false; 83 } 84 85 /** These are called inside the per-device-layer loop for each draw call. 86 When these are called, we have already applied any saveLayer operations, 87 and are handling any looping from the paint, and any effects from the 88 DrawFilter. 89 */ 90 virtual void drawPaint(const SkDraw&, const SkPaint& paint); 91 virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode, 92 size_t count, const SkPoint[], 93 const SkPaint& paint); 94 virtual void drawRect(const SkDraw&, const SkRect& r, const SkPaint& paint); 95 virtual void drawPath(const SkDraw&, const SkPath& origpath, 96 const SkPaint& paint, const SkMatrix* prePathMatrix, 97 bool pathIsMutable); 98 virtual void drawBitmap(const SkDraw&, const SkBitmap& bitmap, 99 const SkIRect* srcRectOrNull, 100 const SkMatrix& matrix, const SkPaint& paint); 101 virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap, int x, int y, 102 const SkPaint& paint); 103 virtual void drawText(const SkDraw&, const void* text, size_t len, 104 SkScalar x, SkScalar y, const SkPaint& paint); 105 virtual void drawPosText(const SkDraw&, const void* text, size_t len, 106 const SkScalar pos[], SkScalar constY, 107 int scalarsPerPos, const SkPaint& paint); 108 virtual void drawTextOnPath(const SkDraw&, const void* text, size_t len, 109 const SkPath& path, const SkMatrix* matrix, 110 const SkPaint& paint); 111 virtual void drawVertices(const SkDraw&, SkCanvas::VertexMode, 112 int vertexCount, const SkPoint verts[], 113 const SkPoint texs[], const SkColor colors[], 114 SkXfermode* xmode, const uint16_t indices[], 115 int indexCount, const SkPaint& paint); 116 virtual void drawDevice(const SkDraw&, SkDevice*, int x, int y, 117 const SkPaint&); 118 119 // PDF specific methods. 120 121 /** Returns a reference to the resource dictionary for this device. 122 */ 123 SK_API const SkRefPtr<SkPDFDict>& getResourceDict(); 124 125 /** Get the list of resources (PDF objects) used on this page. 126 * @param resourceList A list to append the resources to. 127 */ 128 SK_API void getResources(SkTDArray<SkPDFObject*>* resourceList) const; 129 130 /** Get the fonts used on this device. 131 */ 132 SK_API const SkTDArray<SkPDFFont*>& getFontResources() const; 133 134 /** Returns the media box for this device. 135 */ 136 SK_API SkRefPtr<SkPDFArray> getMediaBox() const; 137 138 /** Returns a SkStream with the page contents. The caller is responsible 139 for a reference to the returned value. 140 */ 141 SK_API SkStream* content() const; 142 initialTransform()143 SK_API const SkMatrix& initialTransform() const { 144 return fInitialTransform; 145 } 146 147 protected: 148 // override 149 virtual SkDeviceFactory* onNewDeviceFactory(); 150 151 private: 152 friend class SkPDFDeviceFactory; 153 // TODO(vandebo) push most of SkPDFDevice's state into a core object in 154 // order to get the right access levels without using friend. 155 friend class ScopedContentEntry; 156 157 SkISize fPageSize; 158 SkISize fContentSize; 159 SkMatrix fInitialTransform; 160 SkClipStack fExistingClipStack; 161 SkRegion fExistingClipRegion; 162 SkRefPtr<SkPDFDict> fResourceDict; 163 164 SkTDArray<SkPDFGraphicState*> fGraphicStateResources; 165 SkTDArray<SkPDFObject*> fXObjectResources; 166 SkTDArray<SkPDFFont*> fFontResources; 167 SkTDArray<SkPDFShader*> fShaderResources; 168 169 SkTScopedPtr<ContentEntry> fContentEntries; 170 ContentEntry* fLastContentEntry; 171 172 // For use by the DeviceFactory. 173 SkPDFDevice(const SkISize& layerSize, const SkClipStack& existingClipStack, 174 const SkRegion& existingClipRegion); 175 176 void init(); 177 void cleanUp(); 178 void createFormXObjectFromDevice(SkRefPtr<SkPDFFormXObject>* xobject); 179 180 // Clear the passed clip from all existing content entries. 181 void clearClipFromContent(const SkClipStack* clipStack, 182 const SkRegion& clipRegion); 183 void drawFormXObjectWithClip(SkPDFFormXObject* form, 184 const SkClipStack* clipStack, 185 const SkRegion& clipRegion, 186 bool invertClip); 187 188 // If the paint or clip is such that we shouldn't draw anything, this 189 // returns NULL and does not create a content entry. 190 // setUpContentEntry and finishContentEntry can be used directly, but 191 // the preferred method is to use the ScopedContentEntry helper class. 192 ContentEntry* setUpContentEntry(const SkClipStack* clipStack, 193 const SkRegion& clipRegion, 194 const SkMatrix& matrix, 195 const SkPaint& paint, 196 bool hasText, 197 SkRefPtr<SkPDFFormXObject>* dst); 198 void finishContentEntry(SkXfermode::Mode xfermode, 199 SkPDFFormXObject* dst); 200 bool isContentEmpty(); 201 202 void populateGraphicStateEntryFromPaint(const SkMatrix& matrix, 203 const SkClipStack& clipStack, 204 const SkRegion& clipRegion, 205 const SkPaint& paint, 206 bool hasText, 207 GraphicStateEntry* entry); 208 int addGraphicStateResource(SkPDFGraphicState* gs); 209 210 void updateFont(const SkPaint& paint, uint16_t glyphID, 211 ContentEntry* contentEntry); 212 int getFontResourceIndex(SkTypeface* typeface, uint16_t glyphID); 213 214 void internalDrawPaint(const SkPaint& paint, ContentEntry* contentEntry); 215 void internalDrawBitmap(const SkMatrix& matrix, 216 const SkClipStack* clipStack, 217 const SkRegion& clipRegion, 218 const SkBitmap& bitmap, 219 const SkIRect* srcRect, 220 const SkPaint& paint); 221 222 // Disable the default copy and assign implementation. 223 SkPDFDevice(const SkPDFDevice&); 224 void operator=(const SkPDFDevice&); 225 }; 226 227 #endif 228