reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 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 |
| 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: |
| 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: |
| 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 |