| /* |
| * 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; |
| sk_sp<SkSurface> onNewSurface(const SkImageInfo&) override; |
| sk_sp<SkImage> onNewImageSnapshot(SkBudgeted, ForceCopyMode) override; |
| void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) override; |
| void onCopyOnWrite(ContentChangeMode) override; |
| void onRestoreBackingMutability() override; |
| |
| private: |
| SkBitmap fBitmap; |
| size_t fRowBytes; |
| 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; |
| case kRGBA_F16_SkColorType: |
| shift = 3; |
| 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, nullptr, releaseProc, context); |
| fRowBytes = 0; // don't need to track the rowbytes |
| 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, pr->rowBytes()); |
| fBitmap.setPixelRef(pr); |
| fRowBytes = pr->rowBytes(); // we track this, so that subsequent re-allocs will match |
| fWeOwnThePixels = true; |
| } |
| |
| SkCanvas* SkSurface_Raster::onNewCanvas() { return new SkCanvas(fBitmap, this->props()); } |
| |
| sk_sp<SkSurface> SkSurface_Raster::onNewSurface(const SkImageInfo& info) { |
| return SkSurface::MakeRaster(info, &this->props()); |
| } |
| |
| void SkSurface_Raster::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, |
| const SkPaint* paint) { |
| canvas->drawBitmap(fBitmap, x, y, paint); |
| } |
| |
| sk_sp<SkImage> SkSurface_Raster::onNewImageSnapshot(SkBudgeted, ForceCopyMode forceCopyMode) { |
| 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(); |
| } |
| } else { |
| forceCopyMode = kYes_ForceCopyMode; |
| } |
| |
| // 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 SkMakeImageFromRasterBitmap(fBitmap, 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? |
| sk_sp<SkImage> cached(this->refCachedImage(SkBudgeted::kNo, kNo_ForceUnique)); |
| SkASSERT(cached); |
| if (SkBitmapImageGetPixelRef(cached.get()) == fBitmap.pixelRef()) { |
| SkASSERT(fWeOwnThePixels); |
| if (kDiscard_ContentChangeMode == mode) { |
| fBitmap.allocPixels(); |
| } else { |
| SkBitmap prev(fBitmap); |
| fBitmap.allocPixels(); |
| prev.lockPixels(); |
| SkASSERT(prev.info() == fBitmap.info()); |
| SkASSERT(prev.rowBytes() == fBitmap.rowBytes()); |
| memcpy(fBitmap.getPixels(), prev.getPixels(), fBitmap.getSafeSize()); |
| } |
| SkASSERT(fBitmap.rowBytes() == fRowBytes); // be sure we always use the same value |
| |
| // 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); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkSurface> SkSurface::MakeRasterDirectReleaseProc(const SkImageInfo& info, void* pixels, |
| size_t rb, void (*releaseProc)(void* pixels, void* context), void* context, |
| const SkSurfaceProps* props) { |
| if (nullptr == releaseProc) { |
| context = nullptr; |
| } |
| if (!SkSurface_Raster::Valid(info, rb)) { |
| return nullptr; |
| } |
| if (nullptr == pixels) { |
| return nullptr; |
| } |
| |
| return sk_make_sp<SkSurface_Raster>(info, pixels, rb, releaseProc, context, props); |
| } |
| |
| sk_sp<SkSurface> SkSurface::MakeRasterDirect(const SkImageInfo& info, void* pixels, size_t rowBytes, |
| const SkSurfaceProps* props) { |
| return MakeRasterDirectReleaseProc(info, pixels, rowBytes, nullptr, nullptr, props); |
| } |
| |
| sk_sp<SkSurface> SkSurface::MakeRaster(const SkImageInfo& info, size_t rowBytes, |
| const SkSurfaceProps* props) { |
| if (!SkSurface_Raster::Valid(info)) { |
| return nullptr; |
| } |
| |
| SkAutoTUnref<SkPixelRef> pr(SkMallocPixelRef::NewZeroed(info, rowBytes, nullptr)); |
| if (nullptr == pr.get()) { |
| return nullptr; |
| } |
| if (rowBytes) { |
| SkASSERT(pr->rowBytes() == rowBytes); |
| } |
| return sk_make_sp<SkSurface_Raster>(pr, props); |
| } |