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comparison: gfx/skia/trunk/src/utils/SkPictureUtils.cpp

gfx/skia/trunk/src/utils/SkPictureUtils.cpp

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TOR_BUG_3246
changeset 7
129ffea94266
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-1:000000000000 0:c5a6998aceac
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 #include "SkBitmapDevice.h"
9 #include "SkCanvas.h"
10 #include "SkData.h"
11 #include "SkNoSaveLayerCanvas.h"
12 #include "SkPictureUtils.h"
13 #include "SkPixelRef.h"
14 #include "SkRRect.h"
15 #include "SkShader.h"
16
17 class PixelRefSet {
18 public:
19 PixelRefSet(SkTDArray<SkPixelRef*>* array) : fArray(array) {}
20
21 // This does a linear search on existing pixelrefs, so if this list gets big
22 // we should use a more complex sorted/hashy thing.
23 //
24 void add(SkPixelRef* pr) {
25 uint32_t genID = pr->getGenerationID();
26 if (fGenID.find(genID) < 0) {
27 *fArray->append() = pr;
28 *fGenID.append() = genID;
29 // SkDebugf("--- adding [%d] %x %d\n", fArray->count() - 1, pr, genID);
30 } else {
31 // SkDebugf("--- already have %x %d\n", pr, genID);
32 }
33 }
34
35 private:
36 SkTDArray<SkPixelRef*>* fArray;
37 SkTDArray<uint32_t> fGenID;
38 };
39
40 static void not_supported() {
41 SkDEBUGFAIL("this method should never be called");
42 }
43
44 static void nothing_to_do() {}
45
46 /**
47 * This device will route all bitmaps (primitives and in shaders) to its PRSet.
48 * It should never actually draw anything, so there need not be any pixels
49 * behind its device.
50 */
51 class GatherPixelRefDevice : public SkBaseDevice {
52 public:
53 SK_DECLARE_INST_COUNT(GatherPixelRefDevice)
54
55 GatherPixelRefDevice(int width, int height, PixelRefSet* prset) {
56 fSize.set(width, height);
57 fEmptyBitmap.setConfig(SkImageInfo::MakeUnknown(width, height));
58 fPRSet = prset;
59 }
60
61 virtual int width() const SK_OVERRIDE { return fSize.width(); }
62 virtual int height() const SK_OVERRIDE { return fSize.height(); }
63 virtual bool isOpaque() const SK_OVERRIDE { return false; }
64 virtual SkBitmap::Config config() const SK_OVERRIDE {
65 return SkBitmap::kNo_Config;
66 }
67 virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }
68 virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE {
69 return false;
70 }
71 // TODO: allow this call to return failure, or move to SkBitmapDevice only.
72 virtual const SkBitmap& onAccessBitmap() SK_OVERRIDE {
73 return fEmptyBitmap;
74 }
75 virtual void lockPixels() SK_OVERRIDE { nothing_to_do(); }
76 virtual void unlockPixels() SK_OVERRIDE { nothing_to_do(); }
77 virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
78 virtual bool canHandleImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
79 virtual bool filterImage(const SkImageFilter*, const SkBitmap&, const SkImageFilter::Context&,
80 SkBitmap* result, SkIPoint* offset) SK_OVERRIDE {
81 return false;
82 }
83
84 virtual void clear(SkColor color) SK_OVERRIDE {
85 nothing_to_do();
86 }
87
88 #ifdef SK_SUPPORT_LEGACY_WRITEPIXELSCONFIG
89 virtual void writePixels(const SkBitmap& bitmap, int x, int y,
90 SkCanvas::Config8888 config8888) SK_OVERRIDE {
91 not_supported();
92 }
93 #endif
94
95 virtual void drawPaint(const SkDraw&, const SkPaint& paint) SK_OVERRIDE {
96 this->addBitmapFromPaint(paint);
97 }
98 virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode, size_t count,
99 const SkPoint[], const SkPaint& paint) SK_OVERRIDE {
100 this->addBitmapFromPaint(paint);
101 }
102 virtual void drawRect(const SkDraw&, const SkRect&,
103 const SkPaint& paint) SK_OVERRIDE {
104 this->addBitmapFromPaint(paint);
105 }
106 virtual void drawRRect(const SkDraw&, const SkRRect&,
107 const SkPaint& paint) SK_OVERRIDE {
108 this->addBitmapFromPaint(paint);
109 }
110 virtual void drawOval(const SkDraw&, const SkRect&,
111 const SkPaint& paint) SK_OVERRIDE {
112 this->addBitmapFromPaint(paint);
113 }
114 virtual void drawPath(const SkDraw&, const SkPath& path,
115 const SkPaint& paint, const SkMatrix* prePathMatrix,
116 bool pathIsMutable) SK_OVERRIDE {
117 this->addBitmapFromPaint(paint);
118 }
119 virtual void drawBitmap(const SkDraw&, const SkBitmap& bitmap,
120 const SkMatrix&, const SkPaint& paint) SK_OVERRIDE {
121 this->addBitmap(bitmap);
122 if (SkBitmap::kA8_Config == bitmap.config()) {
123 this->addBitmapFromPaint(paint);
124 }
125 }
126 virtual void drawBitmapRect(const SkDraw&, const SkBitmap& bitmap,
127 const SkRect* srcOrNull, const SkRect& dst,
128 const SkPaint& paint,
129 SkCanvas::DrawBitmapRectFlags flags) SK_OVERRIDE {
130 this->addBitmap(bitmap);
131 if (SkBitmap::kA8_Config == bitmap.config()) {
132 this->addBitmapFromPaint(paint);
133 }
134 }
135 virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap,
136 int x, int y, const SkPaint& paint) SK_OVERRIDE {
137 this->addBitmap(bitmap);
138 }
139 virtual void drawText(const SkDraw&, const void* text, size_t len,
140 SkScalar x, SkScalar y,
141 const SkPaint& paint) SK_OVERRIDE {
142 this->addBitmapFromPaint(paint);
143 }
144 virtual void drawPosText(const SkDraw&, const void* text, size_t len,
145 const SkScalar pos[], SkScalar constY,
146 int, const SkPaint& paint) SK_OVERRIDE {
147 this->addBitmapFromPaint(paint);
148 }
149 virtual void drawTextOnPath(const SkDraw&, const void* text, size_t len,
150 const SkPath& path, const SkMatrix* matrix,
151 const SkPaint& paint) SK_OVERRIDE {
152 this->addBitmapFromPaint(paint);
153 }
154 virtual void drawVertices(const SkDraw&, SkCanvas::VertexMode, int vertexCount,
155 const SkPoint verts[], const SkPoint texs[],
156 const SkColor colors[], SkXfermode* xmode,
157 const uint16_t indices[], int indexCount,
158 const SkPaint& paint) SK_OVERRIDE {
159 this->addBitmapFromPaint(paint);
160 }
161 virtual void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y,
162 const SkPaint&) SK_OVERRIDE {
163 nothing_to_do();
164 }
165
166 protected:
167 virtual bool onReadPixels(const SkBitmap& bitmap,
168 int x, int y,
169 SkCanvas::Config8888 config8888) SK_OVERRIDE {
170 not_supported();
171 return false;
172 }
173
174 virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE {
175 not_supported();
176 }
177 virtual SkBaseDevice* onCreateDevice(const SkImageInfo& info, Usage usage) SK_OVERRIDE {
178 // we expect to only get called via savelayer, in which case it is fine.
179 SkASSERT(kSaveLayer_Usage == usage);
180 return SkNEW_ARGS(GatherPixelRefDevice, (info.width(), info.height(), fPRSet));
181 }
182 virtual void flush() SK_OVERRIDE {}
183
184 private:
185 PixelRefSet* fPRSet;
186 SkBitmap fEmptyBitmap; // legacy -- need to remove the need for this guy
187 SkISize fSize;
188
189 void addBitmap(const SkBitmap& bm) {
190 fPRSet->add(bm.pixelRef());
191 }
192
193 void addBitmapFromPaint(const SkPaint& paint) {
194 SkShader* shader = paint.getShader();
195 if (shader) {
196 SkBitmap bm;
197 // Check whether the shader is a gradient in order to short-circuit
198 // call to asABitmap to prevent generation of bitmaps from
199 // gradient shaders, which implement asABitmap.
200 if (SkShader::kNone_GradientType == shader->asAGradient(NULL) &&
201 shader->asABitmap(&bm, NULL, NULL)) {
202 fPRSet->add(bm.pixelRef());
203 }
204 }
205 }
206
207 typedef SkBaseDevice INHERITED;
208 };
209
210 SkData* SkPictureUtils::GatherPixelRefs(SkPicture* pict, const SkRect& area) {
211 if (NULL == pict) {
212 return NULL;
213 }
214
215 // this test also handles if either area or pict's width/height are empty
216 if (!SkRect::Intersects(area,
217 SkRect::MakeWH(SkIntToScalar(pict->width()),
218 SkIntToScalar(pict->height())))) {
219 return NULL;
220 }
221
222 SkTDArray<SkPixelRef*> array;
223 PixelRefSet prset(&array);
224
225 GatherPixelRefDevice device(pict->width(), pict->height(), &prset);
226 SkNoSaveLayerCanvas canvas(&device);
227
228 canvas.clipRect(area, SkRegion::kIntersect_Op, false);
229 canvas.drawPicture(*pict);
230
231 SkData* data = NULL;
232 int count = array.count();
233 if (count > 0) {
234 data = SkData::NewFromMalloc(array.detach(), count * sizeof(SkPixelRef*));
235 }
236 return data;
237 }

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