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