1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPictureUtils.h"
#include "SkCanvas.h"
#include "SkData.h"
#include "SkDevice.h"
#include "SkPixelRef.h"
#include "SkShader.h"
#include "SkRRect.h"
class PixelRefSet {
public:
PixelRefSet(SkTDArray<SkPixelRef*>* array) : fArray(array) {}
// This does a linear search on existing pixelrefs, so if this list gets big
// we should use a more complex sorted/hashy thing.
//
void add(SkPixelRef* pr) {
uint32_t genID = pr->getGenerationID();
if (fGenID.find(genID) < 0) {
*fArray->append() = pr;
*fGenID.append() = genID;
// SkDebugf("--- adding [%d] %x %d\n", fArray->count() - 1, pr, genID);
} else {
// SkDebugf("--- already have %x %d\n", pr, genID);
}
}
private:
SkTDArray<SkPixelRef*>* fArray;
SkTDArray<uint32_t> fGenID;
};
static void not_supported() {
SkDEBUGFAIL("this method should never be called");
}
static void nothing_to_do() {}
/**
* This device will route all bitmaps (primitives and in shaders) to its PRSet.
* It should never actually draw anything, so there need not be any pixels
* behind its device-bitmap.
*/
class GatherPixelRefDevice : public SkDevice {
private:
PixelRefSet* fPRSet;
void addBitmap(const SkBitmap& bm) {
fPRSet->add(bm.pixelRef());
}
void addBitmapFromPaint(const SkPaint& paint) {
SkShader* shader = paint.getShader();
if (shader) {
SkBitmap bm;
// Check whether the shader is a gradient in order to short-circuit
// call to asABitmap to prevent generation of bitmaps from
// gradient shaders, which implement asABitmap.
if (SkShader::kNone_GradientType == shader->asAGradient(NULL) &&
shader->asABitmap(&bm, NULL, NULL)) {
fPRSet->add(bm.pixelRef());
}
}
}
public:
GatherPixelRefDevice(const SkBitmap& bm, PixelRefSet* prset) : SkDevice(bm) {
fPRSet = prset;
}
virtual void clear(SkColor color) SK_OVERRIDE {
nothing_to_do();
}
virtual void writePixels(const SkBitmap& bitmap, int x, int y,
SkCanvas::Config8888 config8888) SK_OVERRIDE {
not_supported();
}
virtual void drawPaint(const SkDraw&, const SkPaint& paint) SK_OVERRIDE {
this->addBitmapFromPaint(paint);
}
virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode, size_t count,
const SkPoint[], const SkPaint& paint) SK_OVERRIDE {
this->addBitmapFromPaint(paint);
}
virtual void drawRect(const SkDraw&, const SkRect&,
const SkPaint& paint) SK_OVERRIDE {
this->addBitmapFromPaint(paint);
}
virtual void drawOval(const SkDraw&, const SkRect&,
const SkPaint& paint) SK_OVERRIDE {
this->addBitmapFromPaint(paint);
}
virtual void drawPath(const SkDraw&, const SkPath& path,
const SkPaint& paint, const SkMatrix* prePathMatrix,
bool pathIsMutable) SK_OVERRIDE {
this->addBitmapFromPaint(paint);
}
virtual void drawBitmap(const SkDraw&, const SkBitmap& bitmap,
const SkMatrix&, const SkPaint&) SK_OVERRIDE {
this->addBitmap(bitmap);
}
virtual void drawBitmapRect(const SkDraw&, const SkBitmap& bitmap,
const SkRect* srcOrNull, const SkRect& dst,
const SkPaint&,
SkCanvas::DrawBitmapRectFlags flags) SK_OVERRIDE {
this->addBitmap(bitmap);
}
virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap,
int x, int y, const SkPaint& paint) SK_OVERRIDE {
this->addBitmap(bitmap);
}
virtual void drawText(const SkDraw&, const void* text, size_t len,
SkScalar x, SkScalar y,
const SkPaint& paint) SK_OVERRIDE {
this->addBitmapFromPaint(paint);
}
virtual void drawPosText(const SkDraw&, const void* text, size_t len,
const SkScalar pos[], SkScalar constY,
int, const SkPaint& paint) SK_OVERRIDE {
this->addBitmapFromPaint(paint);
}
virtual void drawTextOnPath(const SkDraw&, const void* text, size_t len,
const SkPath& path, const SkMatrix* matrix,
const SkPaint& paint) SK_OVERRIDE {
this->addBitmapFromPaint(paint);
}
virtual void drawVertices(const SkDraw&, SkCanvas::VertexMode, int vertexCount,
const SkPoint verts[], const SkPoint texs[],
const SkColor colors[], SkXfermode* xmode,
const uint16_t indices[], int indexCount,
const SkPaint& paint) SK_OVERRIDE {
this->addBitmapFromPaint(paint);
}
virtual void drawDevice(const SkDraw&, SkDevice*, int x, int y,
const SkPaint&) SK_OVERRIDE {
nothing_to_do();
}
protected:
virtual bool onReadPixels(const SkBitmap& bitmap,
int x, int y,
SkCanvas::Config8888 config8888) SK_OVERRIDE {
not_supported();
return false;
}
};
class NoSaveLayerCanvas : public SkCanvas {
public:
NoSaveLayerCanvas(SkDevice* device) : INHERITED(device) {}
// turn saveLayer() into save() for speed, should not affect correctness.
virtual int saveLayer(const SkRect* bounds, const SkPaint* paint,
SaveFlags flags) SK_OVERRIDE {
// Like SkPictureRecord, we don't want to create layers, but we do need
// to respect the save and (possibly) its rect-clip.
int count = this->INHERITED::save(flags);
if (bounds) {
this->INHERITED::clipRectBounds(bounds, flags, NULL);
}
return count;
}
// disable aa for speed
virtual bool clipRect(const SkRect& rect, SkRegion::Op op,
bool doAA) SK_OVERRIDE {
return this->INHERITED::clipRect(rect, op, false);
}
// for speed, just respect the bounds, and disable AA. May give us a few
// false positives and negatives.
virtual bool clipPath(const SkPath& path, SkRegion::Op op,
bool doAA) SK_OVERRIDE {
return this->updateClipConservativelyUsingBounds(path.getBounds(), op, path.isInverseFillType());
}
virtual bool clipRRect(const SkRRect& rrect, SkRegion::Op op,
bool doAA) SK_OVERRIDE {
return this->updateClipConservativelyUsingBounds(rrect.getBounds(), op, false);
}
private:
typedef SkCanvas INHERITED;
};
SkData* SkPictureUtils::GatherPixelRefs(SkPicture* pict, const SkRect& area) {
if (NULL == pict) {
return NULL;
}
// this test also handles if either area or pict's width/height are empty
if (!SkRect::Intersects(area,
SkRect::MakeWH(SkIntToScalar(pict->width()),
SkIntToScalar(pict->height())))) {
return NULL;
}
SkTDArray<SkPixelRef*> array;
PixelRefSet prset(&array);
SkBitmap emptyBitmap;
emptyBitmap.setConfig(SkBitmap::kARGB_8888_Config, pict->width(), pict->height());
// note: we do not set any pixels (shouldn't need to)
GatherPixelRefDevice device(emptyBitmap, &prset);
NoSaveLayerCanvas canvas(&device);
canvas.clipRect(area, SkRegion::kIntersect_Op, false);
canvas.drawPicture(*pict);
SkData* data = NULL;
int count = array.count();
if (count > 0) {
data = SkData::NewFromMalloc(array.detach(), count * sizeof(SkPixelRef*));
}
return data;
}
|
