The Tor Browser / file comparison

comparison: gfx/skia/trunk/src/image/SkImage_Raster.cpp

gfx/skia/trunk/src/image/SkImage_Raster.cpp

branch
TOR_BUG_9701
changeset 11
deefc01c0e14
equal deleted inserted replaced
-1:000000000000 0:ff183275b9a5
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 "SkImage_Base.h"
9 #include "SkImagePriv.h"
10 #include "SkBitmap.h"
11 #include "SkCanvas.h"
12 #include "SkData.h"
13 #include "SkMallocPixelRef.h"
14
15 class SkImage_Raster : public SkImage_Base {
16 public:
17 static bool ValidArgs(const Info& info, size_t rowBytes) {
18 const int maxDimension = SK_MaxS32 >> 2;
19 const size_t kMaxPixelByteSize = SK_MaxS32;
20
21 if (info.fWidth < 0 || info.fHeight < 0) {
22 return false;
23 }
24 if (info.fWidth > maxDimension || info.fHeight > maxDimension) {
25 return false;
26 }
27 if ((unsigned)info.fColorType > (unsigned)kLastEnum_SkColorType) {
28 return false;
29 }
30 if ((unsigned)info.fAlphaType > (unsigned)kLastEnum_SkAlphaType) {
31 return false;
32 }
33
34 if (SkImageInfoToBitmapConfig(info) == SkBitmap::kNo_Config) {
35 return false;
36 }
37
38 // TODO: check colorspace
39
40 if (rowBytes < SkImageMinRowBytes(info)) {
41 return false;
42 }
43
44 int64_t size = (int64_t)info.fHeight * rowBytes;
45 if (size > (int64_t)kMaxPixelByteSize) {
46 return false;
47 }
48 return true;
49 }
50
51 static SkImage* NewEmpty();
52
53 SkImage_Raster(const SkImageInfo&, SkData*, size_t rb);
54 virtual ~SkImage_Raster();
55
56 virtual void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE;
57 virtual void onDrawRectToRect(SkCanvas*, const SkRect*, const SkRect&, const SkPaint*) SK_OVERRIDE;
58 virtual bool onReadPixels(SkBitmap*, const SkIRect&) const SK_OVERRIDE;
59 virtual const void* onPeekPixels(SkImageInfo*, size_t* /*rowBytes*/) const SK_OVERRIDE;
60 virtual bool getROPixels(SkBitmap*) const SK_OVERRIDE;
61
62 // exposed for SkSurface_Raster via SkNewImageFromPixelRef
63 SkImage_Raster(const SkImageInfo&, SkPixelRef*, size_t rowBytes);
64
65 SkPixelRef* getPixelRef() const { return fBitmap.pixelRef(); }
66
67 private:
68 SkImage_Raster() : INHERITED(0, 0) {}
69
70 SkBitmap fBitmap;
71
72 typedef SkImage_Base INHERITED;
73 };
74
75 ///////////////////////////////////////////////////////////////////////////////
76
77 SkImage* SkImage_Raster::NewEmpty() {
78 // Returns lazily created singleton
79 static SkImage* gEmpty;
80 if (NULL == gEmpty) {
81 gEmpty = SkNEW(SkImage_Raster);
82 }
83 gEmpty->ref();
84 return gEmpty;
85 }
86
87 static void release_data(void* addr, void* context) {
88 SkData* data = static_cast<SkData*>(context);
89 data->unref();
90 }
91
92 SkImage_Raster::SkImage_Raster(const Info& info, SkData* data, size_t rowBytes)
93 : INHERITED(info.fWidth, info.fHeight)
94 {
95 data->ref();
96 void* addr = const_cast<void*>(data->data());
97
98 fBitmap.installPixels(info, addr, rowBytes, release_data, data);
99 fBitmap.setImmutable();
100 fBitmap.lockPixels();
101 }
102
103 SkImage_Raster::SkImage_Raster(const Info& info, SkPixelRef* pr, size_t rowBytes)
104 : INHERITED(info.fWidth, info.fHeight)
105 {
106 fBitmap.setConfig(info, rowBytes);
107 fBitmap.setPixelRef(pr);
108 fBitmap.lockPixels();
109 }
110
111 SkImage_Raster::~SkImage_Raster() {}
112
113 void SkImage_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) {
114 canvas->drawBitmap(fBitmap, x, y, paint);
115 }
116
117 void SkImage_Raster::onDrawRectToRect(SkCanvas* canvas, const SkRect* src,
118 const SkRect& dst, const SkPaint* paint) {
119 canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
120 }
121
122 bool SkImage_Raster::onReadPixels(SkBitmap* dst, const SkIRect& subset) const {
123 if (dst->pixelRef()) {
124 return this->INHERITED::onReadPixels(dst, subset);
125 } else {
126 SkBitmap src;
127 if (!fBitmap.extractSubset(&src, subset)) {
128 return false;
129 }
130 return src.copyTo(dst, src.colorType());
131 }
132 }
133
134 const void* SkImage_Raster::onPeekPixels(SkImageInfo* infoPtr,
135 size_t* rowBytesPtr) const {
136 SkImageInfo info;
137 if (!fBitmap.asImageInfo(&info) || !fBitmap.getPixels()) {
138 return NULL;
139 }
140 *infoPtr = info;
141 *rowBytesPtr = fBitmap.rowBytes();
142 return fBitmap.getPixels();
143 }
144
145 bool SkImage_Raster::getROPixels(SkBitmap* dst) const {
146 *dst = fBitmap;
147 return true;
148 }
149
150 ///////////////////////////////////////////////////////////////////////////////
151
152 SkImage* SkImage::NewRasterCopy(const SkImageInfo& info, const void* pixels, size_t rowBytes) {
153 if (!SkImage_Raster::ValidArgs(info, rowBytes)) {
154 return NULL;
155 }
156 if (0 == info.fWidth && 0 == info.fHeight) {
157 return SkImage_Raster::NewEmpty();
158 }
159 // check this after empty-check
160 if (NULL == pixels) {
161 return NULL;
162 }
163
164 // Here we actually make a copy of the caller's pixel data
165 SkAutoDataUnref data(SkData::NewWithCopy(pixels, info.fHeight * rowBytes));
166 return SkNEW_ARGS(SkImage_Raster, (info, data, rowBytes));
167 }
168
169
170 SkImage* SkImage::NewRasterData(const SkImageInfo& info, SkData* data, size_t rowBytes) {
171 if (!SkImage_Raster::ValidArgs(info, rowBytes)) {
172 return NULL;
173 }
174 if (0 == info.fWidth && 0 == info.fHeight) {
175 return SkImage_Raster::NewEmpty();
176 }
177 // check this after empty-check
178 if (NULL == data) {
179 return NULL;
180 }
181
182 // did they give us enough data?
183 size_t size = info.fHeight * rowBytes;
184 if (data->size() < size) {
185 return NULL;
186 }
187
188 return SkNEW_ARGS(SkImage_Raster, (info, data, rowBytes));
189 }
190
191 SkImage* SkNewImageFromPixelRef(const SkImageInfo& info, SkPixelRef* pr,
192 size_t rowBytes) {
193 return SkNEW_ARGS(SkImage_Raster, (info, pr, rowBytes));
194 }
195
196 SkPixelRef* SkBitmapImageGetPixelRef(SkImage* image) {
197 return ((SkImage_Raster*)image)->getPixelRef();
198 }

Mercurial Repository: The Tor Browser

Europalab SCM Repository Server

mercurial