1 /* libs/graphics/sgl/SkBlitter.h 2 ** 3 ** Copyright 2006, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #ifndef SkBlitter_DEFINED 19 #define SkBlitter_DEFINED 20 21 #include "SkBitmap.h" 22 #include "SkMatrix.h" 23 #include "SkPaint.h" 24 #include "SkRefCnt.h" 25 #include "SkRegion.h" 26 #include "SkMask.h" 27 28 class SkBlitter { 29 public: 30 virtual ~SkBlitter(); 31 32 virtual void blitH(int x, int y, int width); 33 virtual void blitAntiH(int x, int y, const SkAlpha[], const int16_t runs[]); 34 virtual void blitV(int x, int y, int height, SkAlpha alpha); 35 virtual void blitRect(int x, int y, int width, int height); 36 virtual void blitMask(const SkMask&, const SkIRect& clip); 37 38 /* If the blitter just sets a single value for each pixel, return the 39 bitmap it draws into, and assign value. If not, return NULL and ignore 40 the value parameter. 41 */ 42 virtual const SkBitmap* justAnOpaqueColor(uint32_t* value); 43 44 // not virtual, just helpers 45 void blitMaskRegion(const SkMask& mask, const SkRegion& clip); 46 void blitRectRegion(const SkIRect& rect, const SkRegion& clip); 47 void blitRegion(const SkRegion& clip); 48 49 // factories Choose(const SkBitmap & device,const SkMatrix & matrix,const SkPaint & paint)50 static SkBlitter* Choose(const SkBitmap& device, 51 const SkMatrix& matrix, 52 const SkPaint& paint) { 53 return Choose(device, matrix, paint, NULL, 0); 54 } 55 56 static SkBlitter* Choose(const SkBitmap& device, 57 const SkMatrix& matrix, 58 const SkPaint& paint, 59 void* storage, size_t storageSize); 60 61 static SkBlitter* ChooseSprite(const SkBitmap& device, 62 const SkPaint&, 63 const SkBitmap& src, 64 int left, int top, 65 void* storage, size_t storageSize); 66 67 private: 68 }; 69 70 /** This blitter silently never draws anything. 71 */ 72 class SkNullBlitter : public SkBlitter { 73 public: 74 virtual void blitH(int x, int y, int width); 75 virtual void blitAntiH(int x, int y, const SkAlpha[], const int16_t runs[]); 76 virtual void blitV(int x, int y, int height, SkAlpha alpha); 77 virtual void blitRect(int x, int y, int width, int height); 78 virtual void blitMask(const SkMask&, const SkIRect& clip); 79 virtual const SkBitmap* justAnOpaqueColor(uint32_t* value); 80 }; 81 82 /** Wraps another (real) blitter, and ensures that the real blitter is only 83 called with coordinates that have been clipped by the specified clipRect. 84 This means the caller need not perform the clipping ahead of time. 85 */ 86 class SkRectClipBlitter : public SkBlitter { 87 public: init(SkBlitter * blitter,const SkIRect & clipRect)88 void init(SkBlitter* blitter, const SkIRect& clipRect) { 89 SkASSERT(!clipRect.isEmpty()); 90 fBlitter = blitter; 91 fClipRect = clipRect; 92 } 93 94 // overrides 95 virtual void blitH(int x, int y, int width); 96 virtual void blitAntiH(int x, int y, const SkAlpha[], const int16_t runs[]); 97 virtual void blitV(int x, int y, int height, SkAlpha alpha); 98 virtual void blitRect(int x, int y, int width, int height); 99 virtual void blitMask(const SkMask&, const SkIRect& clip); 100 virtual const SkBitmap* justAnOpaqueColor(uint32_t* value); 101 102 private: 103 SkBlitter* fBlitter; 104 SkIRect fClipRect; 105 }; 106 107 /** Wraps another (real) blitter, and ensures that the real blitter is only 108 called with coordinates that have been clipped by the specified clipRgn. 109 This means the caller need not perform the clipping ahead of time. 110 */ 111 class SkRgnClipBlitter : public SkBlitter { 112 public: init(SkBlitter * blitter,const SkRegion * clipRgn)113 void init(SkBlitter* blitter, const SkRegion* clipRgn) { 114 SkASSERT(clipRgn && !clipRgn->isEmpty()); 115 fBlitter = blitter; 116 fRgn = clipRgn; 117 } 118 119 // overrides 120 virtual void blitH(int x, int y, int width); 121 virtual void blitAntiH(int x, int y, const SkAlpha[], const int16_t runs[]); 122 virtual void blitV(int x, int y, int height, SkAlpha alpha); 123 virtual void blitRect(int x, int y, int width, int height); 124 virtual void blitMask(const SkMask&, const SkIRect& clip); 125 virtual const SkBitmap* justAnOpaqueColor(uint32_t* value); 126 127 private: 128 SkBlitter* fBlitter; 129 const SkRegion* fRgn; 130 }; 131 132 class SkBlitterClipper { 133 public: 134 SkBlitter* apply(SkBlitter* blitter, const SkRegion* clip, 135 const SkIRect* bounds = NULL); 136 137 private: 138 SkNullBlitter fNullBlitter; 139 SkRectClipBlitter fRectBlitter; 140 SkRgnClipBlitter fRgnBlitter; 141 }; 142 143 #endif 144