| /* |
| * 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 "SkImageInfoPriv.h" |
| #include "SkImagePriv.h" |
| #include "SkCanvas.h" |
| #include "SkDevice.h" |
| #include "SkMallocPixelRef.h" |
| |
| class SkSurface_Raster : public SkSurface_Base { |
| public: |
| SkSurface_Raster(const SkImageInfo&, void*, size_t rb, |
| void (*releaseProc)(void* pixels, void* context), void* context, |
| const SkSurfaceProps*); |
| SkSurface_Raster(const SkImageInfo& info, sk_sp<SkPixelRef>, const SkSurfaceProps*); |
| |
| SkCanvas* onNewCanvas() override; |
| sk_sp<SkSurface> onNewSurface(const SkImageInfo&) override; |
| sk_sp<SkImage> onNewImageSnapshot(const SkIRect* subset) override; |
| void onWritePixels(const SkPixmap&, int x, int y) 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 SkSurfaceValidateRasterInfo(const SkImageInfo& info, size_t rowBytes) { |
| if (!SkImageInfoIsValid(info)) { |
| return false; |
| } |
| |
| if (kIgnoreRowBytesValue == rowBytes) { |
| return true; |
| } |
| |
| int shift = info.shiftPerPixel(); |
| |
| 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); |
| static const size_t kMaxTotalSize = SK_MaxS32; |
| 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, releaseProc, context); |
| fRowBytes = 0; // don't need to track the rowbytes |
| fWeOwnThePixels = false; // We are "Direct" |
| } |
| |
| SkSurface_Raster::SkSurface_Raster(const SkImageInfo& info, sk_sp<SkPixelRef> pr, |
| const SkSurfaceProps* props) |
| : INHERITED(pr->width(), pr->height(), props) |
| { |
| fBitmap.setInfo(info, pr->rowBytes()); |
| fRowBytes = pr->rowBytes(); // we track this, so that subsequent re-allocs will match |
| fBitmap.setPixelRef(std::move(pr), 0, 0); |
| 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(const SkIRect* subset) { |
| if (subset) { |
| SkASSERT(SkIRect::MakeWH(fBitmap.width(), fBitmap.height()).contains(*subset)); |
| SkBitmap dst; |
| dst.allocPixels(fBitmap.info().makeWH(subset->width(), subset->height())); |
| SkAssertResult(fBitmap.readPixels(dst.pixmap(), subset->left(), subset->top())); |
| dst.setImmutable(); // key, so MakeFromBitmap doesn't make a copy of the buffer |
| return SkImage::MakeFromBitmap(dst); |
| } |
| |
| SkCopyPixelsMode cpm = kIfMutable_SkCopyPixelsMode; |
| 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 { |
| cpm = kAlways_SkCopyPixelsMode; |
| } |
| |
| // 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, cpm); |
| } |
| |
| void SkSurface_Raster::onWritePixels(const SkPixmap& src, int x, int y) { |
| fBitmap.writePixels(src, x, y); |
| } |
| |
| 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()); |
| SkASSERT(cached); |
| if (SkBitmapImageGetPixelRef(cached.get()) == fBitmap.pixelRef()) { |
| SkASSERT(fWeOwnThePixels); |
| if (kDiscard_ContentChangeMode == mode) { |
| fBitmap.allocPixels(); |
| } else { |
| SkBitmap prev(fBitmap); |
| fBitmap.allocPixels(); |
| SkASSERT(prev.info() == fBitmap.info()); |
| SkASSERT(prev.rowBytes() == fBitmap.rowBytes()); |
| memcpy(fBitmap.getPixels(), prev.getPixels(), fBitmap.computeByteSize()); |
| } |
| 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 (!SkSurfaceValidateRasterInfo(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 (!SkSurfaceValidateRasterInfo(info)) { |
| return nullptr; |
| } |
| |
| sk_sp<SkPixelRef> pr = SkMallocPixelRef::MakeZeroed(info, rowBytes); |
| if (!pr) { |
| return nullptr; |
| } |
| if (rowBytes) { |
| SkASSERT(pr->rowBytes() == rowBytes); |
| } |
| return sk_make_sp<SkSurface_Raster>(info, std::move(pr), props); |
| } |
| |
| sk_sp<SkSurface> SkSurface::MakeRasterN32Premul(int width, int height, |
| const SkSurfaceProps* surfaceProps) { |
| return MakeRaster(SkImageInfo::MakeN32Premul(width, height), surfaceProps); |
| } |