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 "include/core/SkCanvas.h"
9 #include "include/core/SkMallocPixelRef.h"
10 #include "include/private/SkImageInfoPriv.h"
11 #include "src/core/SkDevice.h"
12 #include "src/core/SkImagePriv.h"
13 #include "src/image/SkSurface_Base.h"
14
15 class SkSurface_Raster : public SkSurface_Base {
16 public:
17 SkSurface_Raster(const SkImageInfo&, void*, size_t rb,
18 void (*releaseProc)(void* pixels, void* context), void* context,
19 const SkSurfaceProps*);
20 SkSurface_Raster(const SkImageInfo& info, sk_sp<SkPixelRef>, const SkSurfaceProps*);
21
22 SkCanvas* onNewCanvas() override;
23 sk_sp<SkSurface> onNewSurface(const SkImageInfo&) override;
24 sk_sp<SkImage> onNewImageSnapshot(const SkIRect* subset) override;
25 void onWritePixels(const SkPixmap&, int x, int y) override;
26 void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) override;
27 void onCopyOnWrite(ContentChangeMode) override;
28 void onRestoreBackingMutability() override;
29
30 private:
31 SkBitmap fBitmap;
32 bool fWeOwnThePixels;
33
34 typedef SkSurface_Base INHERITED;
35 };
36
37 ///////////////////////////////////////////////////////////////////////////////
38
SkSurfaceValidateRasterInfo(const SkImageInfo & info,size_t rowBytes)39 bool SkSurfaceValidateRasterInfo(const SkImageInfo& info, size_t rowBytes) {
40 if (!SkImageInfoIsValid(info)) {
41 return false;
42 }
43
44 if (info.colorType() == kR8G8_unorm_SkColorType ||
45 info.colorType() == kR16G16_unorm_SkColorType ||
46 info.colorType() == kR16G16_float_SkColorType ||
47 info.colorType() == kA16_unorm_SkColorType ||
48 info.colorType() == kA16_float_SkColorType ||
49 info.colorType() == kR16G16B16A16_unorm_SkColorType) {
50 return false;
51 }
52
53 if (kIgnoreRowBytesValue == rowBytes) {
54 return true;
55 }
56
57 if (!info.validRowBytes(rowBytes)) {
58 return false;
59 }
60
61 uint64_t size = sk_64_mul(info.height(), rowBytes);
62 static const size_t kMaxTotalSize = SK_MaxS32;
63 if (size > kMaxTotalSize) {
64 return false;
65 }
66
67 return true;
68 }
69
SkSurface_Raster(const SkImageInfo & info,void * pixels,size_t rb,void (* releaseProc)(void * pixels,void * context),void * context,const SkSurfaceProps * props)70 SkSurface_Raster::SkSurface_Raster(const SkImageInfo& info, void* pixels, size_t rb,
71 void (*releaseProc)(void* pixels, void* context), void* context,
72 const SkSurfaceProps* props)
73 : INHERITED(info, props)
74 {
75 fBitmap.installPixels(info, pixels, rb, releaseProc, context);
76 fWeOwnThePixels = false; // We are "Direct"
77 }
78
SkSurface_Raster(const SkImageInfo & info,sk_sp<SkPixelRef> pr,const SkSurfaceProps * props)79 SkSurface_Raster::SkSurface_Raster(const SkImageInfo& info, sk_sp<SkPixelRef> pr,
80 const SkSurfaceProps* props)
81 : INHERITED(pr->width(), pr->height(), props)
82 {
83 fBitmap.setInfo(info, pr->rowBytes());
84 fBitmap.setPixelRef(std::move(pr), 0, 0);
85 fWeOwnThePixels = true;
86 }
87
onNewCanvas()88 SkCanvas* SkSurface_Raster::onNewCanvas() { return new SkCanvas(fBitmap, this->props()); }
89
onNewSurface(const SkImageInfo & info)90 sk_sp<SkSurface> SkSurface_Raster::onNewSurface(const SkImageInfo& info) {
91 return SkSurface::MakeRaster(info, &this->props());
92 }
93
onDraw(SkCanvas * canvas,SkScalar x,SkScalar y,const SkPaint * paint)94 void SkSurface_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y,
95 const SkPaint* paint) {
96 canvas->drawBitmap(fBitmap, x, y, paint);
97 }
98
onNewImageSnapshot(const SkIRect * subset)99 sk_sp<SkImage> SkSurface_Raster::onNewImageSnapshot(const SkIRect* subset) {
100 if (subset) {
101 SkASSERT(SkIRect::MakeWH(fBitmap.width(), fBitmap.height()).contains(*subset));
102 SkBitmap dst;
103 dst.allocPixels(fBitmap.info().makeDimensions(subset->size()));
104 SkAssertResult(fBitmap.readPixels(dst.pixmap(), subset->left(), subset->top()));
105 dst.setImmutable(); // key, so MakeFromBitmap doesn't make a copy of the buffer
106 return SkImage::MakeFromBitmap(dst);
107 }
108
109 SkCopyPixelsMode cpm = kIfMutable_SkCopyPixelsMode;
110 if (fWeOwnThePixels) {
111 // SkImage_raster requires these pixels are immutable for its full lifetime.
112 // We'll undo this via onRestoreBackingMutability() if we can avoid the COW.
113 if (SkPixelRef* pr = fBitmap.pixelRef()) {
114 pr->setTemporarilyImmutable();
115 }
116 } else {
117 cpm = kAlways_SkCopyPixelsMode;
118 }
119
120 // Our pixels are in memory, so read access on the snapshot SkImage could be cheap.
121 // Lock the shared pixel ref to ensure peekPixels() is usable.
122 return SkMakeImageFromRasterBitmap(fBitmap, cpm);
123 }
124
onWritePixels(const SkPixmap & src,int x,int y)125 void SkSurface_Raster::onWritePixels(const SkPixmap& src, int x, int y) {
126 fBitmap.writePixels(src, x, y);
127 }
128
onRestoreBackingMutability()129 void SkSurface_Raster::onRestoreBackingMutability() {
130 SkASSERT(!this->hasCachedImage()); // Shouldn't be any snapshots out there.
131 if (SkPixelRef* pr = fBitmap.pixelRef()) {
132 pr->restoreMutability();
133 }
134 }
135
onCopyOnWrite(ContentChangeMode mode)136 void SkSurface_Raster::onCopyOnWrite(ContentChangeMode mode) {
137 // are we sharing pixelrefs with the image?
138 sk_sp<SkImage> cached(this->refCachedImage());
139 SkASSERT(cached);
140 if (SkBitmapImageGetPixelRef(cached.get()) == fBitmap.pixelRef()) {
141 SkASSERT(fWeOwnThePixels);
142 if (kDiscard_ContentChangeMode == mode) {
143 fBitmap.allocPixels();
144 } else {
145 SkBitmap prev(fBitmap);
146 fBitmap.allocPixels();
147 SkASSERT(prev.info() == fBitmap.info());
148 SkASSERT(prev.rowBytes() == fBitmap.rowBytes());
149 memcpy(fBitmap.getPixels(), prev.getPixels(), fBitmap.computeByteSize());
150 }
151
152 // Now fBitmap is a deep copy of itself (and therefore different from
153 // what is being used by the image. Next we update the canvas to use
154 // this as its backend, so we can't modify the image's pixels anymore.
155 SkASSERT(this->getCachedCanvas());
156 this->getCachedCanvas()->getDevice()->replaceBitmapBackendForRasterSurface(fBitmap);
157 }
158 }
159
160 ///////////////////////////////////////////////////////////////////////////////
161
MakeRasterDirectReleaseProc(const SkImageInfo & info,void * pixels,size_t rb,void (* releaseProc)(void * pixels,void * context),void * context,const SkSurfaceProps * props)162 sk_sp<SkSurface> SkSurface::MakeRasterDirectReleaseProc(const SkImageInfo& info, void* pixels,
163 size_t rb, void (*releaseProc)(void* pixels, void* context), void* context,
164 const SkSurfaceProps* props) {
165 if (nullptr == releaseProc) {
166 context = nullptr;
167 }
168 if (!SkSurfaceValidateRasterInfo(info, rb)) {
169 return nullptr;
170 }
171 if (nullptr == pixels) {
172 return nullptr;
173 }
174
175 return sk_make_sp<SkSurface_Raster>(info, pixels, rb, releaseProc, context, props);
176 }
177
MakeRasterDirect(const SkImageInfo & info,void * pixels,size_t rowBytes,const SkSurfaceProps * props)178 sk_sp<SkSurface> SkSurface::MakeRasterDirect(const SkImageInfo& info, void* pixels, size_t rowBytes,
179 const SkSurfaceProps* props) {
180 return MakeRasterDirectReleaseProc(info, pixels, rowBytes, nullptr, nullptr, props);
181 }
182
MakeRaster(const SkImageInfo & info,size_t rowBytes,const SkSurfaceProps * props)183 sk_sp<SkSurface> SkSurface::MakeRaster(const SkImageInfo& info, size_t rowBytes,
184 const SkSurfaceProps* props) {
185 if (!SkSurfaceValidateRasterInfo(info)) {
186 return nullptr;
187 }
188
189 sk_sp<SkPixelRef> pr = SkMallocPixelRef::MakeAllocate(info, rowBytes);
190 if (!pr) {
191 return nullptr;
192 }
193 if (rowBytes) {
194 SkASSERT(pr->rowBytes() == rowBytes);
195 }
196 return sk_make_sp<SkSurface_Raster>(info, std::move(pr), props);
197 }
198
MakeRasterN32Premul(int width,int height,const SkSurfaceProps * surfaceProps)199 sk_sp<SkSurface> SkSurface::MakeRasterN32Premul(int width, int height,
200 const SkSurfaceProps* surfaceProps) {
201 return MakeRaster(SkImageInfo::MakeN32Premul(width, height), surfaceProps);
202 }
203