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1 /* | |
2 * Copyright 2013 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 #include "SkCanvasStateUtils.h" | |
9 | |
10 #include "SkBitmapDevice.h" | |
11 #include "SkCanvas.h" | |
12 #include "SkNWayCanvas.h" | |
13 #include "SkWriter32.h" | |
14 | |
15 #define CANVAS_STATE_VERSION 1 | |
16 /* | |
17 * WARNING: The structs below are part of a stable ABI and as such we explicitly | |
18 * use unambigious primitives (e.g. int32_t instead of an enum). | |
19 * | |
20 * ANY CHANGES TO THE STRUCTS BELOW THAT IMPACT THE ABI SHOULD RESULT IN AN | |
21 * UPDATE OF THE CANVAS_STATE_VERSION. SUCH CHANGES SHOULD ONLY BE MADE IF | |
22 * ABSOLUTELY NECESSARY! | |
23 */ | |
24 enum RasterConfigs { | |
25 kUnknown_RasterConfig = 0, | |
26 kRGB_565_RasterConfig = 1, | |
27 kARGB_8888_RasterConfig = 2 | |
28 }; | |
29 typedef int32_t RasterConfig; | |
30 | |
31 enum CanvasBackends { | |
32 kUnknown_CanvasBackend = 0, | |
33 kRaster_CanvasBackend = 1, | |
34 kGPU_CanvasBackend = 2, | |
35 kPDF_CanvasBackend = 3 | |
36 }; | |
37 typedef int32_t CanvasBackend; | |
38 | |
39 struct ClipRect { | |
40 int32_t left, top, right, bottom; | |
41 }; | |
42 | |
43 struct SkMCState { | |
44 float matrix[9]; | |
45 // NOTE: this only works for non-antialiased clips | |
46 int32_t clipRectCount; | |
47 ClipRect* clipRects; | |
48 }; | |
49 | |
50 // NOTE: If you add more members, bump CanvasState::version. | |
51 struct SkCanvasLayerState { | |
52 CanvasBackend type; | |
53 int32_t x, y; | |
54 int32_t width; | |
55 int32_t height; | |
56 | |
57 SkMCState mcState; | |
58 | |
59 union { | |
60 struct { | |
61 RasterConfig config; // pixel format: a value from RasterConfigs. | |
62 uint32_t rowBytes; // Number of bytes from start of one line to ne xt. | |
63 void* pixels; // The pixels, all (height * rowBytes) of them. | |
64 } raster; | |
65 struct { | |
66 int32_t textureID; | |
67 } gpu; | |
68 }; | |
69 }; | |
70 | |
71 class SkCanvasState { | |
72 public: | |
73 SkCanvasState(SkCanvas* canvas) { | |
74 SkASSERT(canvas); | |
75 version = CANVAS_STATE_VERSION; | |
76 width = canvas->getDeviceSize().width(); | |
77 height = canvas->getDeviceSize().height(); | |
78 layerCount = 0; | |
79 layers = NULL; | |
80 originalCanvas = SkRef(canvas); | |
81 | |
82 mcState.clipRectCount = 0; | |
83 mcState.clipRects = NULL; | |
84 } | |
85 | |
86 ~SkCanvasState() { | |
87 // loop through the layers and free the data allocated to the clipRects | |
88 for (int i = 0; i < layerCount; ++i) { | |
89 sk_free(layers[i].mcState.clipRects); | |
90 } | |
91 | |
92 sk_free(mcState.clipRects); | |
93 sk_free(layers); | |
94 | |
95 // it is now safe to free the canvas since there should be no remaining | |
96 // references to the content that is referenced by this canvas (e.g. pix els) | |
97 originalCanvas->unref(); | |
98 } | |
99 | |
100 /** | |
101 * The version this struct was built with. This field must always appear | |
102 * first in the struct so that when the versions don't match (and the | |
103 * remaining contents and size are potentially different) we can still | |
104 * compare the version numbers. | |
105 */ | |
106 int32_t version; | |
107 | |
108 int32_t width; | |
109 int32_t height; | |
110 | |
111 SkMCState mcState; | |
112 | |
113 int32_t layerCount; | |
114 SkCanvasLayerState* layers; | |
115 | |
116 private: | |
117 SkCanvas* originalCanvas; | |
118 }; | |
119 | |
120 //////////////////////////////////////////////////////////////////////////////// | |
121 | |
122 class ClipValidator : public SkCanvas::ClipVisitor { | |
123 public: | |
124 ClipValidator() : fFailed(false) {} | |
125 bool failed() { return fFailed; } | |
126 | |
127 // ClipVisitor | |
128 virtual void clipRect(const SkRect& rect, SkRegion::Op op, bool antialias) S K_OVERRIDE { | |
129 fFailed |= antialias; | |
130 } | |
131 | |
132 virtual void clipPath(const SkPath&, SkRegion::Op, bool antialias) SK_OVERRI DE { | |
133 fFailed |= antialias; | |
134 } | |
135 | |
136 private: | |
137 bool fFailed; | |
138 }; | |
139 | |
140 static void setup_MC_state(SkMCState* state, const SkMatrix& matrix, const SkReg ion& clip) { | |
141 // initialize the struct | |
142 state->clipRectCount = 0; | |
143 | |
144 // capture the matrix | |
145 for (int i = 0; i < 9; i++) { | |
146 state->matrix[i] = matrix.get(i); | |
147 } | |
148 | |
149 /* | |
150 * capture the clip | |
151 * | |
152 * storage is allocated on the stack for the first 4 rects. This value was | |
153 * chosen somewhat arbitrarily, but does allow us to represent simple clips | |
154 * and some more common complex clips (e.g. a clipRect with a sub-rect | |
155 * clipped out of its interior) without needing to malloc any additional mem ory. | |
156 */ | |
157 const int clipBufferSize = 4 * sizeof(ClipRect); | |
158 char clipBuffer[clipBufferSize]; | |
159 SkWriter32 clipWriter(sizeof(ClipRect), clipBuffer, clipBufferSize); | |
160 | |
161 if (!clip.isEmpty()) { | |
162 // only returns the b/w clip so aa clips fail | |
163 SkRegion::Iterator clip_iterator(clip); | |
164 for (; !clip_iterator.done(); clip_iterator.next()) { | |
165 // this assumes the SkIRect is stored in l,t,r,b ordering which | |
166 // matches the ordering of our ClipRect struct | |
167 clipWriter.writeIRect(clip_iterator.rect()); | |
168 state->clipRectCount++; | |
169 } | |
170 } | |
171 | |
172 // allocate memory for the clip then and copy them to the struct | |
173 state->clipRects = (ClipRect*) sk_malloc_throw(clipWriter.size()); | |
174 clipWriter.flatten(state->clipRects); | |
175 } | |
176 | |
177 | |
178 | |
179 SkCanvasState* SkCanvasStateUtils::CaptureCanvasState(SkCanvas* canvas) { | |
180 SkASSERT(canvas); | |
181 | |
182 // Check the clip can be decomposed into rectangles (i.e. no soft clips). | |
183 ClipValidator validator; | |
184 canvas->replayClips(&validator); | |
185 if (validator.failed()) { | |
186 SkDEBUGF(("CaptureCanvasState does not support canvases with antialiased clips.\n")); | |
187 return NULL; | |
188 } | |
189 | |
190 SkAutoTDelete<SkCanvasState> canvasState(SkNEW_ARGS(SkCanvasState, (canvas)) ); | |
191 | |
192 // decompose the total matrix and clip | |
193 setup_MC_state(&canvasState->mcState, canvas->getTotalMatrix(), canvas->getT otalClip()); | |
194 | |
195 /* | |
196 * decompose the layers | |
197 * | |
198 * storage is allocated on the stack for the first 3 layers. It is common in | |
199 * some view systems (e.g. Android) that a few non-clipped layers are presen t | |
200 * and we will not need to malloc any additional memory in those cases. | |
201 */ | |
202 const int layerBufferSize = 3 * sizeof(SkCanvasLayerState); | |
203 char layerBuffer[layerBufferSize]; | |
204 SkWriter32 layerWriter(sizeof(SkCanvasLayerState), layerBuffer, layerBufferS ize); | |
205 int layerCount = 0; | |
206 for (SkCanvas::LayerIter layer(canvas, true/*skipEmptyClips*/); !layer.done( ); layer.next()) { | |
207 | |
208 // we currently only work for bitmap backed devices | |
209 const SkBitmap& bitmap = layer.device()->accessBitmap(true/*changePixels */); | |
210 if (bitmap.empty() || bitmap.isNull() || !bitmap.lockPixelsAreWritable() ) { | |
211 return NULL; | |
212 } | |
213 | |
214 SkCanvasLayerState* layerState = | |
215 (SkCanvasLayerState*) layerWriter.reserve(sizeof(SkCanvasLayerSt ate)); | |
216 layerState->type = kRaster_CanvasBackend; | |
217 layerState->x = layer.x(); | |
218 layerState->y = layer.y(); | |
219 layerState->width = bitmap.width(); | |
220 layerState->height = bitmap.height(); | |
221 | |
222 switch (bitmap.config()) { | |
223 case SkBitmap::kARGB_8888_Config: | |
224 layerState->raster.config = kARGB_8888_RasterConfig; | |
225 break; | |
226 case SkBitmap::kRGB_565_Config: | |
227 layerState->raster.config = kRGB_565_RasterConfig; | |
228 break; | |
229 default: | |
230 return NULL; | |
231 } | |
232 layerState->raster.rowBytes = bitmap.rowBytes(); | |
233 layerState->raster.pixels = bitmap.getPixels(); | |
234 | |
235 setup_MC_state(&layerState->mcState, layer.matrix(), layer.clip()); | |
236 layerCount++; | |
237 } | |
238 | |
239 // allocate memory for the layers and then and copy them to the struct | |
240 SkASSERT(layerWriter.size() == layerCount * sizeof(SkCanvasLayerState)); | |
241 canvasState->layerCount = layerCount; | |
242 canvasState->layers = (SkCanvasLayerState*) sk_malloc_throw(layerWriter.size ()); | |
243 layerWriter.flatten(canvasState->layers); | |
244 | |
245 // for now, just ignore any client supplied DrawFilter. | |
246 if (canvas->getDrawFilter()) { | |
247 SkDEBUGF(("CaptureCanvasState will ignore the canvases draw filter.\n")) ; | |
248 } | |
249 | |
250 return canvasState.detach(); | |
251 } | |
252 | |
253 //////////////////////////////////////////////////////////////////////////////// | |
254 | |
255 static void setup_canvas_from_MC_state(const SkMCState& state, SkCanvas* canvas) { | |
256 // reconstruct the matrix | |
257 SkMatrix matrix; | |
258 for (int i = 0; i < 9; i++) { | |
259 matrix.set(i, state.matrix[i]); | |
260 } | |
261 | |
262 // reconstruct the clip | |
263 SkRegion clip; | |
264 for (int i = 0; i < state.clipRectCount; ++i) { | |
265 clip.op(SkIRect::MakeLTRB(state.clipRects[i].left, | |
266 state.clipRects[i].top, | |
267 state.clipRects[i].right, | |
268 state.clipRects[i].bottom), | |
269 SkRegion::kUnion_Op); | |
270 } | |
271 | |
272 canvas->setMatrix(matrix); | |
273 canvas->setClipRegion(clip); | |
274 } | |
275 | |
276 static SkCanvas* create_canvas_from_canvas_layer(const SkCanvasLayerState& layer State) { | |
277 SkASSERT(kRaster_CanvasBackend == layerState.type); | |
278 | |
279 SkBitmap bitmap; | |
280 SkBitmap::Config config = | |
281 layerState.raster.config == kARGB_8888_RasterConfig ? SkBitmap::kARGB_88 88_Config : | |
282 layerState.raster.config == kRGB_565_RasterConfig ? SkBitmap::kRGB_565_C onfig : | |
283 SkBitmap::kNo_Config; | |
284 | |
285 if (config == SkBitmap::kNo_Config) { | |
286 return NULL; | |
287 } | |
288 | |
289 bitmap.setConfig(config, layerState.width, layerState.height, | |
290 layerState.raster.rowBytes); | |
291 bitmap.setPixels(layerState.raster.pixels); | |
292 | |
293 SkASSERT(!bitmap.empty()); | |
294 SkASSERT(!bitmap.isNull()); | |
295 | |
296 // create a device & canvas | |
297 SkAutoTUnref<SkBitmapDevice> device(SkNEW_ARGS(SkBitmapDevice, (bitmap))); | |
298 SkAutoTUnref<SkCanvas> canvas(SkNEW_ARGS(SkCanvas, (device.get()))); | |
299 | |
300 // setup the matrix and clip | |
301 setup_canvas_from_MC_state(layerState.mcState, canvas.get()); | |
302 | |
303 return canvas.detach(); | |
304 } | |
305 | |
306 SkCanvas* SkCanvasStateUtils::CreateFromCanvasState(const SkCanvasState* state) { | |
307 SkASSERT(state); | |
308 | |
309 // check that the versions match | |
310 if (CANVAS_STATE_VERSION != state->version) { | |
311 SkDebugf("CreateFromCanvasState version does not match the one use to cr eate the input"); | |
312 return NULL; | |
313 } | |
314 | |
315 if (state->layerCount < 1) { | |
316 return NULL; | |
317 } | |
318 | |
319 SkAutoTUnref<SkNWayCanvas> canvas(SkNEW_ARGS(SkNWayCanvas, (state->width, st ate->height))); | |
320 | |
321 // setup the matrix and clip on the n-way canvas | |
322 setup_canvas_from_MC_state(state->mcState, canvas); | |
323 | |
324 // Iterate over the layers and add them to the n-way canvas | |
325 for (int i = 0; i < state->layerCount; ++i) { | |
326 SkAutoTUnref<SkCanvas> canvasLayer(create_canvas_from_canvas_layer(state ->layers[i])); | |
327 if (!canvasLayer.get()) { | |
328 return NULL; | |
329 } | |
330 canvas->addCanvas(canvasLayer.get()); | |
joth
2013/08/30 06:45:57
I think there's a bug here that you never look at
joth
2013/08/30 07:05:04
Hmm OK x & y maybe a red-herring.
I looked a bit
djsollen
2013/08/30 11:51:19
Yes, the setMatrix will cause some havoc with this
| |
331 } | |
332 | |
333 return canvas.detach(); | |
334 } | |
335 | |
336 //////////////////////////////////////////////////////////////////////////////// | |
337 | |
338 void SkCanvasStateUtils::ReleaseCanvasState(SkCanvasState* state) { | |
339 SkDELETE(state); | |
340 } | |
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