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 "SkSurface_Base.h" 9 #include "SkImagePriv.h" 10 #include "SkCanvas.h" 11 #include "SkDevice.h" 12 #include "SkMallocPixelRef.h" 13 14 class SkSurface_Raster : public SkSurface_Base { 15 public: 16 SkSurface_Raster(const SkImageInfo&, void*, size_t rb, 17 void (*releaseProc)(void* pixels, void* context), void* context, 18 const SkSurfaceProps*); 19 SkSurface_Raster(const SkImageInfo& info, sk_sp<SkPixelRef>, const SkSurfaceProps*); 20 21 SkCanvas* onNewCanvas() override; 22 sk_sp<SkSurface> onNewSurface(const SkImageInfo&) override; 23 sk_sp<SkImage> onNewImageSnapshot() override; 24 void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) override; 25 void onCopyOnWrite(ContentChangeMode) override; 26 void onRestoreBackingMutability() override; 27 28 private: 29 SkBitmap fBitmap; 30 size_t fRowBytes; 31 bool fWeOwnThePixels; 32 33 typedef SkSurface_Base INHERITED; 34 }; 35 36 /////////////////////////////////////////////////////////////////////////////// 37 38 bool SkSurfaceValidateRasterInfo(const SkImageInfo& info, size_t rowBytes) { 39 if (info.isEmpty()) { 40 return false; 41 } 42 43 static const size_t kMaxTotalSize = SK_MaxS32; 44 45 // TODO(mtklein,brianosman): revisit all these color space decisions 46 switch (info.colorType()) { 47 case kAlpha_8_SkColorType: 48 case kGray_8_SkColorType: 49 case kRGB_565_SkColorType: 50 case kARGB_4444_SkColorType: 51 case kRGB_888x_SkColorType: 52 case kRGBA_1010102_SkColorType: 53 case kRGB_101010x_SkColorType: 54 if (info.colorSpace()) { 55 return false; 56 } 57 break; 58 59 case kRGBA_8888_SkColorType: 60 case kBGRA_8888_SkColorType: 61 if (info.colorSpace() && !info.colorSpace()->gammaCloseToSRGB()) { 62 return false; 63 } 64 break; 65 case kRGBA_F16_SkColorType: 66 if (info.colorSpace() && (!info.colorSpace()->gammaIsLinear())) { 67 return false; 68 } 69 break; 70 default: 71 return false; 72 } 73 74 if (kIgnoreRowBytesValue == rowBytes) { 75 return true; 76 } 77 78 int shift = SkColorTypeShiftPerPixel(info.colorType()); 79 80 uint64_t minRB = (uint64_t)info.width() << shift; 81 if (minRB > rowBytes) { 82 return false; 83 } 84 85 size_t alignedRowBytes = rowBytes >> shift << shift; 86 if (alignedRowBytes != rowBytes) { 87 return false; 88 } 89 90 uint64_t size = sk_64_mul(info.height(), rowBytes); 91 if (size > kMaxTotalSize) { 92 return false; 93 } 94 95 return true; 96 } 97 98 SkSurface_Raster::SkSurface_Raster(const SkImageInfo& info, void* pixels, size_t rb, 99 void (*releaseProc)(void* pixels, void* context), void* context, 100 const SkSurfaceProps* props) 101 : INHERITED(info, props) 102 { 103 fBitmap.installPixels(info, pixels, rb, releaseProc, context); 104 fRowBytes = 0; // don't need to track the rowbytes 105 fWeOwnThePixels = false; // We are "Direct" 106 } 107 108 SkSurface_Raster::SkSurface_Raster(const SkImageInfo& info, sk_sp<SkPixelRef> pr, 109 const SkSurfaceProps* props) 110 : INHERITED(pr->width(), pr->height(), props) 111 { 112 fBitmap.setInfo(info, pr->rowBytes()); 113 fRowBytes = pr->rowBytes(); // we track this, so that subsequent re-allocs will match 114 fBitmap.setPixelRef(std::move(pr), 0, 0); 115 fWeOwnThePixels = true; 116 } 117 118 SkCanvas* SkSurface_Raster::onNewCanvas() { return new SkCanvas(fBitmap, this->props()); } 119 120 sk_sp<SkSurface> SkSurface_Raster::onNewSurface(const SkImageInfo& info) { 121 return SkSurface::MakeRaster(info, &this->props()); 122 } 123 124 void SkSurface_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, 125 const SkPaint* paint) { 126 canvas->drawBitmap(fBitmap, x, y, paint); 127 } 128 129 sk_sp<SkImage> SkSurface_Raster::onNewImageSnapshot() { 130 SkCopyPixelsMode cpm = kIfMutable_SkCopyPixelsMode; 131 if (fWeOwnThePixels) { 132 // SkImage_raster requires these pixels are immutable for its full lifetime. 133 // We'll undo this via onRestoreBackingMutability() if we can avoid the COW. 134 if (SkPixelRef* pr = fBitmap.pixelRef()) { 135 pr->setTemporarilyImmutable(); 136 } 137 } else { 138 cpm = kAlways_SkCopyPixelsMode; 139 } 140 141 // Our pixels are in memory, so read access on the snapshot SkImage could be cheap. 142 // Lock the shared pixel ref to ensure peekPixels() is usable. 143 return SkMakeImageFromRasterBitmap(fBitmap, cpm); 144 } 145 146 void SkSurface_Raster::onRestoreBackingMutability() { 147 SkASSERT(!this->hasCachedImage()); // Shouldn't be any snapshots out there. 148 if (SkPixelRef* pr = fBitmap.pixelRef()) { 149 pr->restoreMutability(); 150 } 151 } 152 153 void SkSurface_Raster::onCopyOnWrite(ContentChangeMode mode) { 154 // are we sharing pixelrefs with the image? 155 sk_sp<SkImage> cached(this->refCachedImage()); 156 SkASSERT(cached); 157 if (SkBitmapImageGetPixelRef(cached.get()) == fBitmap.pixelRef()) { 158 SkASSERT(fWeOwnThePixels); 159 if (kDiscard_ContentChangeMode == mode) { 160 fBitmap.allocPixels(); 161 } else { 162 SkBitmap prev(fBitmap); 163 fBitmap.allocPixels(); 164 SkASSERT(prev.info() == fBitmap.info()); 165 SkASSERT(prev.rowBytes() == fBitmap.rowBytes()); 166 memcpy(fBitmap.getPixels(), prev.getPixels(), fBitmap.computeByteSize()); 167 } 168 SkASSERT(fBitmap.rowBytes() == fRowBytes); // be sure we always use the same value 169 170 // Now fBitmap is a deep copy of itself (and therefore different from 171 // what is being used by the image. Next we update the canvas to use 172 // this as its backend, so we can't modify the image's pixels anymore. 173 SkASSERT(this->getCachedCanvas()); 174 this->getCachedCanvas()->getDevice()->replaceBitmapBackendForRasterSurface(fBitmap); 175 } 176 } 177 178 /////////////////////////////////////////////////////////////////////////////// 179 180 sk_sp<SkSurface> SkSurface::MakeRasterDirectReleaseProc(const SkImageInfo& info, void* pixels, 181 size_t rb, void (*releaseProc)(void* pixels, void* context), void* context, 182 const SkSurfaceProps* props) { 183 if (nullptr == releaseProc) { 184 context = nullptr; 185 } 186 if (!SkSurfaceValidateRasterInfo(info, rb)) { 187 return nullptr; 188 } 189 if (nullptr == pixels) { 190 return nullptr; 191 } 192 193 return sk_make_sp<SkSurface_Raster>(info, pixels, rb, releaseProc, context, props); 194 } 195 196 sk_sp<SkSurface> SkSurface::MakeRasterDirect(const SkImageInfo& info, void* pixels, size_t rowBytes, 197 const SkSurfaceProps* props) { 198 return MakeRasterDirectReleaseProc(info, pixels, rowBytes, nullptr, nullptr, props); 199 } 200 201 sk_sp<SkSurface> SkSurface::MakeRaster(const SkImageInfo& info, size_t rowBytes, 202 const SkSurfaceProps* props) { 203 if (!SkSurfaceValidateRasterInfo(info)) { 204 return nullptr; 205 } 206 207 sk_sp<SkPixelRef> pr = SkMallocPixelRef::MakeZeroed(info, rowBytes); 208 if (!pr) { 209 return nullptr; 210 } 211 if (rowBytes) { 212 SkASSERT(pr->rowBytes() == rowBytes); 213 } 214 return sk_make_sp<SkSurface_Raster>(info, std::move(pr), props); 215 } 216
