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
|
/*
* 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 "SkSurface_Base.h"
#include "SkImagePriv.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkMallocPixelRef.h"
static const size_t kIgnoreRowBytesValue = (size_t)~0;
class SkSurface_Raster : public SkSurface_Base {
public:
static bool Valid(const SkImageInfo&, size_t rb = kIgnoreRowBytesValue);
SkSurface_Raster(const SkImageInfo&, void*, size_t rb,
void (*releaseProc)(void* pixels, void* context), void* context,
const SkSurfaceProps*);
SkSurface_Raster(SkPixelRef*, const SkSurfaceProps*);
SkCanvas* onNewCanvas() override;
SkSurface* onNewSurface(const SkImageInfo&) override;
SkImage* onNewImageSnapshot(Budgeted) override;
void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) override;
void onCopyOnWrite(ContentChangeMode) override;
void onRestoreBackingMutability() override;
private:
SkBitmap fBitmap;
bool fWeOwnThePixels;
typedef SkSurface_Base INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
bool SkSurface_Raster::Valid(const SkImageInfo& info, size_t rowBytes) {
if (info.isEmpty()) {
return false;
}
static const size_t kMaxTotalSize = SK_MaxS32;
int shift = 0;
switch (info.colorType()) {
case kAlpha_8_SkColorType:
shift = 0;
break;
case kRGB_565_SkColorType:
shift = 1;
break;
case kN32_SkColorType:
shift = 2;
break;
default:
return false;
}
if (kIgnoreRowBytesValue == rowBytes) {
return true;
}
uint64_t minRB = (uint64_t)info.width() << shift;
if (minRB > rowBytes) {
return false;
}
size_t alignedRowBytes = rowBytes >> shift << shift;
if (alignedRowBytes != rowBytes) {
return false;
}
uint64_t size = sk_64_mul(info.height(), rowBytes);
if (size > kMaxTotalSize) {
return false;
}
return true;
}
SkSurface_Raster::SkSurface_Raster(const SkImageInfo& info, void* pixels, size_t rb,
void (*releaseProc)(void* pixels, void* context), void* context,
const SkSurfaceProps* props)
: INHERITED(info, props)
{
fBitmap.installPixels(info, pixels, rb, NULL, releaseProc, context);
fWeOwnThePixels = false; // We are "Direct"
}
SkSurface_Raster::SkSurface_Raster(SkPixelRef* pr, const SkSurfaceProps* props)
: INHERITED(pr->info().width(), pr->info().height(), props)
{
const SkImageInfo& info = pr->info();
fBitmap.setInfo(info, info.minRowBytes());
fBitmap.setPixelRef(pr);
fWeOwnThePixels = true;
if (!info.isOpaque()) {
fBitmap.eraseColor(SK_ColorTRANSPARENT);
}
}
SkCanvas* SkSurface_Raster::onNewCanvas() { return new SkCanvas(fBitmap, this->props()); }
SkSurface* SkSurface_Raster::onNewSurface(const SkImageInfo& info) {
return SkSurface::NewRaster(info, &this->props());
}
void SkSurface_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y,
const SkPaint* paint) {
canvas->drawBitmap(fBitmap, x, y, paint);
}
SkImage* SkSurface_Raster::onNewImageSnapshot(Budgeted) {
if (fWeOwnThePixels) {
// SkImage_raster requires these pixels are immutable for its full lifetime.
// We'll undo this via onRestoreBackingMutability() if we can avoid the COW.
if (SkPixelRef* pr = fBitmap.pixelRef()) {
pr->setTemporarilyImmutable();
}
}
// Our pixels are in memory, so read access on the snapshot SkImage could be cheap.
// Lock the shared pixel ref to ensure peekPixels() is usable.
return SkNewImageFromRasterBitmap(fBitmap, &this->props(),
fWeOwnThePixels ? kNo_ForceCopyMode : kYes_ForceCopyMode);
}
void SkSurface_Raster::onRestoreBackingMutability() {
SkASSERT(!this->hasCachedImage()); // Shouldn't be any snapshots out there.
if (SkPixelRef* pr = fBitmap.pixelRef()) {
pr->restoreMutability();
}
}
void SkSurface_Raster::onCopyOnWrite(ContentChangeMode mode) {
// are we sharing pixelrefs with the image?
SkASSERT(this->getCachedImage(kNo_Budgeted));
if (SkBitmapImageGetPixelRef(this->getCachedImage(kNo_Budgeted)) == fBitmap.pixelRef()) {
SkASSERT(fWeOwnThePixels);
if (kDiscard_ContentChangeMode == mode) {
fBitmap.setPixelRef(NULL);
fBitmap.allocPixels();
} else {
SkBitmap prev(fBitmap);
prev.deepCopyTo(&fBitmap);
}
// Now fBitmap is a deep copy of itself (and therefore different from
// what is being used by the image. Next we update the canvas to use
// this as its backend, so we can't modify the image's pixels anymore.
SkASSERT(this->getCachedCanvas());
this->getCachedCanvas()->getDevice()->replaceBitmapBackendForRasterSurface(fBitmap);
}
}
///////////////////////////////////////////////////////////////////////////////
SkSurface* SkSurface::NewRasterDirectReleaseProc(const SkImageInfo& info, void* pixels, size_t rb,
void (*releaseProc)(void* pixels, void* context),
void* context, const SkSurfaceProps* props) {
if (NULL == releaseProc) {
context = NULL;
}
if (!SkSurface_Raster::Valid(info, rb)) {
return NULL;
}
if (NULL == pixels) {
return NULL;
}
return new SkSurface_Raster(info, pixels, rb, releaseProc, context, props);
}
SkSurface* SkSurface::NewRasterDirect(const SkImageInfo& info, void* pixels, size_t rowBytes,
const SkSurfaceProps* props) {
return NewRasterDirectReleaseProc(info, pixels, rowBytes, NULL, NULL, props);
}
SkSurface* SkSurface::NewRaster(const SkImageInfo& info, const SkSurfaceProps* props) {
if (!SkSurface_Raster::Valid(info)) {
return NULL;
}
SkAutoTUnref<SkPixelRef> pr(SkMallocPixelRef::NewAllocate(info, 0, NULL));
if (NULL == pr.get()) {
return NULL;
}
return new SkSurface_Raster(pr, props);
}
|
