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comparison: gfx/skia/trunk/src/gpu/GrClipMaskCache.h
gfx/skia/trunk/src/gpu/GrClipMaskCache.h
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- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:3b941d76855f |
|---|---|
| 1 /* | |
| 2 * Copyright 2012 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 GrClipMaskCache_DEFINED | |
| 9 #define GrClipMaskCache_DEFINED | |
| 10 | |
| 11 #include "GrContext.h" | |
| 12 #include "SkClipStack.h" | |
| 13 #include "SkTypes.h" | |
| 14 | |
| 15 class GrTexture; | |
| 16 | |
| 17 /** | |
| 18 * The stencil buffer stores the last clip path - providing a single entry | |
| 19 * "cache". This class provides similar functionality for AA clip paths | |
| 20 */ | |
| 21 class GrClipMaskCache : public SkNoncopyable { | |
| 22 public: | |
| 23 GrClipMaskCache(); | |
| 24 | |
| 25 ~GrClipMaskCache() { | |
| 26 | |
| 27 while (!fStack.empty()) { | |
| 28 GrClipStackFrame* temp = (GrClipStackFrame*) fStack.back(); | |
| 29 temp->~GrClipStackFrame(); | |
| 30 fStack.pop_back(); | |
| 31 } | |
| 32 } | |
| 33 | |
| 34 bool canReuse(int32_t clipGenID, const SkIRect& bounds) { | |
| 35 | |
| 36 SkASSERT(clipGenID != SkClipStack::kWideOpenGenID); | |
| 37 SkASSERT(clipGenID != SkClipStack::kEmptyGenID); | |
| 38 | |
| 39 GrClipStackFrame* back = (GrClipStackFrame*) fStack.back(); | |
| 40 | |
| 41 // We could reuse the mask if bounds is a subset of last bounds. We'd have to communicate | |
| 42 // an offset to the caller. | |
| 43 if (back->fLastMask.texture() && | |
| 44 back->fLastBound == bounds && | |
| 45 back->fLastClipGenID == clipGenID) { | |
| 46 return true; | |
| 47 } | |
| 48 | |
| 49 return false; | |
| 50 } | |
| 51 | |
| 52 void reset() { | |
| 53 if (fStack.empty()) { | |
| 54 // SkASSERT(false); | |
| 55 return; | |
| 56 } | |
| 57 | |
| 58 GrClipStackFrame* back = (GrClipStackFrame*) fStack.back(); | |
| 59 | |
| 60 back->reset(); | |
| 61 } | |
| 62 | |
| 63 /** | |
| 64 * After a "push" the clip state is entirely open. Currently, the | |
| 65 * entire clip stack will be re-rendered into a new clip mask. | |
| 66 * TODO: can we take advantage of the nested nature of the clips to | |
| 67 * reduce the mask creation cost? | |
| 68 */ | |
| 69 void push(); | |
| 70 | |
| 71 void pop() { | |
| 72 //SkASSERT(!fStack.empty()); | |
| 73 | |
| 74 if (!fStack.empty()) { | |
| 75 GrClipStackFrame* back = (GrClipStackFrame*) fStack.back(); | |
| 76 | |
| 77 back->~GrClipStackFrame(); | |
| 78 fStack.pop_back(); | |
| 79 } | |
| 80 } | |
| 81 | |
| 82 int32_t getLastClipGenID() const { | |
| 83 | |
| 84 if (fStack.empty()) { | |
| 85 return SkClipStack::kInvalidGenID; | |
| 86 } | |
| 87 | |
| 88 return ((GrClipStackFrame*) fStack.back())->fLastClipGenID; | |
| 89 } | |
| 90 | |
| 91 GrTexture* getLastMask() { | |
| 92 | |
| 93 if (fStack.empty()) { | |
| 94 SkASSERT(false); | |
| 95 return NULL; | |
| 96 } | |
| 97 | |
| 98 GrClipStackFrame* back = (GrClipStackFrame*) fStack.back(); | |
| 99 | |
| 100 return back->fLastMask.texture(); | |
| 101 } | |
| 102 | |
| 103 const GrTexture* getLastMask() const { | |
| 104 | |
| 105 if (fStack.empty()) { | |
| 106 SkASSERT(false); | |
| 107 return NULL; | |
| 108 } | |
| 109 | |
| 110 GrClipStackFrame* back = (GrClipStackFrame*) fStack.back(); | |
| 111 | |
| 112 return back->fLastMask.texture(); | |
| 113 } | |
| 114 | |
| 115 void acquireMask(int32_t clipGenID, | |
| 116 const GrTextureDesc& desc, | |
| 117 const SkIRect& bound) { | |
| 118 | |
| 119 if (fStack.empty()) { | |
| 120 SkASSERT(false); | |
| 121 return; | |
| 122 } | |
| 123 | |
| 124 GrClipStackFrame* back = (GrClipStackFrame*) fStack.back(); | |
| 125 | |
| 126 back->acquireMask(fContext, clipGenID, desc, bound); | |
| 127 } | |
| 128 | |
| 129 int getLastMaskWidth() const { | |
| 130 | |
| 131 if (fStack.empty()) { | |
| 132 SkASSERT(false); | |
| 133 return -1; | |
| 134 } | |
| 135 | |
| 136 GrClipStackFrame* back = (GrClipStackFrame*) fStack.back(); | |
| 137 | |
| 138 if (NULL == back->fLastMask.texture()) { | |
| 139 return -1; | |
| 140 } | |
| 141 | |
| 142 return back->fLastMask.texture()->width(); | |
| 143 } | |
| 144 | |
| 145 int getLastMaskHeight() const { | |
| 146 | |
| 147 if (fStack.empty()) { | |
| 148 SkASSERT(false); | |
| 149 return -1; | |
| 150 } | |
| 151 | |
| 152 GrClipStackFrame* back = (GrClipStackFrame*) fStack.back(); | |
| 153 | |
| 154 if (NULL == back->fLastMask.texture()) { | |
| 155 return -1; | |
| 156 } | |
| 157 | |
| 158 return back->fLastMask.texture()->height(); | |
| 159 } | |
| 160 | |
| 161 void getLastBound(SkIRect* bound) const { | |
| 162 | |
| 163 if (fStack.empty()) { | |
| 164 SkASSERT(false); | |
| 165 bound->setEmpty(); | |
| 166 return; | |
| 167 } | |
| 168 | |
| 169 GrClipStackFrame* back = (GrClipStackFrame*) fStack.back(); | |
| 170 | |
| 171 *bound = back->fLastBound; | |
| 172 } | |
| 173 | |
| 174 void setContext(GrContext* context) { | |
| 175 fContext = context; | |
| 176 } | |
| 177 | |
| 178 GrContext* getContext() { | |
| 179 return fContext; | |
| 180 } | |
| 181 | |
| 182 void releaseResources() { | |
| 183 | |
| 184 SkDeque::F2BIter iter(fStack); | |
| 185 for (GrClipStackFrame* frame = (GrClipStackFrame*) iter.next(); | |
| 186 frame != NULL; | |
| 187 frame = (GrClipStackFrame*) iter.next()) { | |
| 188 frame->reset(); | |
| 189 } | |
| 190 } | |
| 191 | |
| 192 private: | |
| 193 struct GrClipStackFrame { | |
| 194 | |
| 195 GrClipStackFrame() { | |
| 196 this->reset(); | |
| 197 } | |
| 198 | |
| 199 void acquireMask(GrContext* context, | |
| 200 int32_t clipGenID, | |
| 201 const GrTextureDesc& desc, | |
| 202 const SkIRect& bound) { | |
| 203 | |
| 204 fLastClipGenID = clipGenID; | |
| 205 | |
| 206 fLastMask.set(context, desc); | |
| 207 | |
| 208 fLastBound = bound; | |
| 209 } | |
| 210 | |
| 211 void reset () { | |
| 212 fLastClipGenID = SkClipStack::kInvalidGenID; | |
| 213 | |
| 214 GrTextureDesc desc; | |
| 215 | |
| 216 fLastMask.set(NULL, desc); | |
| 217 fLastBound.setEmpty(); | |
| 218 } | |
| 219 | |
| 220 int32_t fLastClipGenID; | |
| 221 // The mask's width & height values are used by GrClipMaskManager to correctly scale the | |
| 222 // texture coords for the geometry drawn with this mask. | |
| 223 GrAutoScratchTexture fLastMask; | |
| 224 // fLastBound stores the bounding box of the clip mask in clip-stack space. This rect is | |
| 225 // used by GrClipMaskManager to position a rect and compute texture coords for the mask. | |
| 226 SkIRect fLastBound; | |
| 227 }; | |
| 228 | |
| 229 GrContext* fContext; | |
| 230 SkDeque fStack; | |
| 231 | |
| 232 typedef SkNoncopyable INHERITED; | |
| 233 }; | |
| 234 | |
| 235 #endif // GrClipMaskCache_DEFINED |
