| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "platform/graphics/DiscardablePixelRef.h" |
| |
| #include "public/platform/Platform.h" |
| #include "wtf/StdLibExtras.h" |
| |
| namespace WebCore { |
| |
| namespace { |
| |
| // URI label for a discardable SkPixelRef. |
| const char labelDiscardable[] = "discardable"; |
| |
| } // namespace |
| |
| |
| bool DiscardablePixelRefAllocator::allocPixelRef(SkBitmap* dst, SkColorTable* ctable) |
| { |
| // It should not be possible to have a non-null color table in Blink. |
| ASSERT(!ctable); |
| |
| Sk64 size = dst->getSize64(); |
| if (size.isNeg() || !size.is32()) |
| return false; |
| |
| SkAutoTUnref<DiscardablePixelRef> pixelRef(new DiscardablePixelRef(adoptPtr(new SkMutex()))); |
| if (pixelRef->allocAndLockDiscardableMemory(size.get32())) { |
| pixelRef->setURI(labelDiscardable); |
| dst->setPixelRef(pixelRef.get()); |
| // This method is only called when a DiscardablePixelRef is created to back a SkBitmap. |
| // It is necessary to lock this SkBitmap to have a valid pointer to pixels. Otherwise, |
| // this SkBitmap could be assigned to another SkBitmap and locking/unlocking the other |
| // SkBitmap will make this one losing its pixels. |
| dst->lockPixels(); |
| return true; |
| } |
| |
| // Fallback to heap allocator if discardable memory is not available. |
| return dst->allocPixels(); |
| } |
| |
| DiscardablePixelRef::DiscardablePixelRef(PassOwnPtr<SkMutex> mutex) |
| : SkPixelRef(mutex.get()) |
| , m_lockedMemory(0) |
| , m_mutex(mutex) |
| { |
| } |
| |
| DiscardablePixelRef::~DiscardablePixelRef() |
| { |
| } |
| |
| bool DiscardablePixelRef::allocAndLockDiscardableMemory(size_t bytes) |
| { |
| m_discardable = adoptPtr(blink::Platform::current()->allocateAndLockDiscardableMemory(bytes)); |
| if (m_discardable) { |
| m_lockedMemory = m_discardable->data(); |
| return true; |
| } |
| return false; |
| } |
| |
| void* DiscardablePixelRef::onLockPixels(SkColorTable** ctable) |
| { |
| if (!m_lockedMemory && m_discardable->lock()) |
| m_lockedMemory = m_discardable->data(); |
| |
| *ctable = 0; |
| return m_lockedMemory; |
| } |
| |
| void DiscardablePixelRef::onUnlockPixels() |
| { |
| if (m_lockedMemory) |
| m_discardable->unlock(); |
| m_lockedMemory = 0; |
| } |
| |
| bool DiscardablePixelRef::isDiscardable(SkPixelRef* pixelRef) |
| { |
| // FIXME: DEFINE_STATIC_LOCAL is not thread safe. |
| // ImageDecodingStore provides the synchronization for this. |
| DEFINE_STATIC_LOCAL(const SkString, discardable, (labelDiscardable)); |
| return pixelRef && pixelRef->getURI() && discardable.equals(pixelRef->getURI()); |
| } |
| |
| } // namespace WebCore |