1 2 /* 3 * Copyright 2013 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 #ifndef SkBitmapDevice_DEFINED 10 #define SkBitmapDevice_DEFINED 11 12 #include "SkBitmap.h" 13 #include "SkCanvas.h" 14 #include "SkColor.h" 15 #include "SkDevice.h" 16 #include "SkImageFilter.h" 17 #include "SkImageInfo.h" 18 #include "SkRect.h" 19 #include "SkScalar.h" 20 #include "SkSize.h" 21 #include "SkSurfaceProps.h" 22 #include "SkTypes.h" 23 24 class SkDraw; 25 class SkMatrix; 26 class SkPaint; 27 class SkPath; 28 class SkPixelRef; 29 class SkPixmap; 30 class SkRRect; 31 class SkSurface; 32 class SkXfermode; 33 struct SkPoint; 34 35 /////////////////////////////////////////////////////////////////////////////// 36 class SK_API SkBitmapDevice : public SkBaseDevice { 37 public: 38 /** 39 * Construct a new device with the specified bitmap as its backend. It is 40 * valid for the bitmap to have no pixels associated with it. In that case, 41 * any drawing to this device will have no effect. 42 */ 43 SkBitmapDevice(const SkBitmap& bitmap); 44 45 /** 46 * Create a new device along with its requisite pixel memory using 47 * default SkSurfaceProps (i.e., kLegacyFontHost_InitType-style). 48 * Note: this entry point is slated for removal - no one should call it. 49 */ 50 static SkBitmapDevice* Create(const SkImageInfo& info); 51 52 /** 53 * Construct a new device with the specified bitmap as its backend. It is 54 * valid for the bitmap to have no pixels associated with it. In that case, 55 * any drawing to this device will have no effect. 56 */ 57 SkBitmapDevice(const SkBitmap& bitmap, const SkSurfaceProps& surfaceProps); 58 59 static SkBitmapDevice* Create(const SkImageInfo&, const SkSurfaceProps&); 60 61 SkImageInfo imageInfo() const override; 62 63 protected: 64 bool onShouldDisableLCD(const SkPaint&) const override; 65 66 /** These are called inside the per-device-layer loop for each draw call. 67 When these are called, we have already applied any saveLayer operations, 68 and are handling any looping from the paint, and any effects from the 69 DrawFilter. 70 */ 71 void drawPaint(const SkDraw&, const SkPaint& paint) override; 72 virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode, size_t count, 73 const SkPoint[], const SkPaint& paint) override; 74 virtual void drawRect(const SkDraw&, const SkRect& r, 75 const SkPaint& paint) override; 76 virtual void drawOval(const SkDraw&, const SkRect& oval, 77 const SkPaint& paint) override; 78 virtual void drawRRect(const SkDraw&, const SkRRect& rr, 79 const SkPaint& paint) override; 80 81 /** 82 * If pathIsMutable, then the implementation is allowed to cast path to a 83 * non-const pointer and modify it in place (as an optimization). Canvas 84 * may do this to implement helpers such as drawOval, by placing a temp 85 * path on the stack to hold the representation of the oval. 86 * 87 * If prePathMatrix is not null, it should logically be applied before any 88 * stroking or other effects. If there are no effects on the paint that 89 * affect the geometry/rasterization, then the pre matrix can just be 90 * pre-concated with the current matrix. 91 */ 92 virtual void drawPath(const SkDraw&, const SkPath& path, 93 const SkPaint& paint, 94 const SkMatrix* prePathMatrix = NULL, 95 bool pathIsMutable = false) override; 96 virtual void drawBitmap(const SkDraw&, const SkBitmap& bitmap, 97 const SkMatrix& matrix, const SkPaint& paint) override; 98 virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap, 99 int x, int y, const SkPaint& paint) override; 100 101 /** 102 * The default impl. will create a bitmap-shader from the bitmap, 103 * and call drawRect with it. 104 */ 105 void drawBitmapRect(const SkDraw&, const SkBitmap&, const SkRect*, const SkRect&, 106 const SkPaint&, SkCanvas::SrcRectConstraint) override; 107 108 /** 109 * Does not handle text decoration. 110 * Decorations (underline and stike-thru) will be handled by SkCanvas. 111 */ 112 virtual void drawText(const SkDraw&, const void* text, size_t len, 113 SkScalar x, SkScalar y, const SkPaint& paint) override; 114 virtual void drawPosText(const SkDraw&, const void* text, size_t len, 115 const SkScalar pos[], int scalarsPerPos, 116 const SkPoint& offset, const SkPaint& paint) override; 117 virtual void drawVertices(const SkDraw&, SkCanvas::VertexMode, int vertexCount, 118 const SkPoint verts[], const SkPoint texs[], 119 const SkColor colors[], SkXfermode* xmode, 120 const uint16_t indices[], int indexCount, 121 const SkPaint& paint) override; 122 virtual void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y, const SkPaint&) override; 123 124 /////////////////////////////////////////////////////////////////////////// 125 126 /** Update as needed the pixel value in the bitmap, so that the caller can 127 access the pixels directly. Note: only the pixels field should be 128 altered. The config/width/height/rowbytes must remain unchanged. 129 @return the device contents as a bitmap 130 */ 131 const SkBitmap& onAccessBitmap() override; 132 getPixelRef()133 SkPixelRef* getPixelRef() const { return fBitmap.pixelRef(); } 134 // just for subclasses, to assign a custom pixelref setPixelRef(SkPixelRef * pr)135 SkPixelRef* setPixelRef(SkPixelRef* pr) { 136 fBitmap.setPixelRef(pr); 137 return pr; 138 } 139 140 bool onReadPixels(const SkImageInfo&, void*, size_t, int x, int y) override; 141 bool onWritePixels(const SkImageInfo&, const void*, size_t, int, int) override; 142 bool onPeekPixels(SkPixmap*) override; 143 bool onAccessPixels(SkPixmap*) override; 144 void onAttachToCanvas(SkCanvas*) override; 145 void onDetachFromCanvas() override; 146 147 private: 148 friend class SkCanvas; 149 friend struct DeviceCM; //for setMatrixClip 150 friend class SkDraw; 151 friend class SkDrawIter; 152 friend class SkDeviceFilteredPaint; 153 154 friend class SkSurface_Raster; 155 156 // used to change the backend's pixels (and possibly config/rowbytes) 157 // but cannot change the width/height, so there should be no change to 158 // any clip information. 159 void replaceBitmapBackendForRasterSurface(const SkBitmap&) override; 160 161 SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) override; 162 163 SkSurface* newSurface(const SkImageInfo&, const SkSurfaceProps&) override; 164 165 SkImageFilter::Cache* getImageFilterCache() override; 166 167 SkBitmap fBitmap; 168 169 void setNewSize(const SkISize&); // Used by SkCanvas for resetForNextPicture(). 170 171 typedef SkBaseDevice INHERITED; 172 }; 173 174 #endif // SkBitmapDevice_DEFINED 175