Revert of Eliminate copies of encoded image data

third_party/WebKit/Source/platform/graphics/ThreadSafeDataTransport.cpp

+/*
+ * Copyright (C) 2012 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 "platform/graphics/ThreadSafeDataTransport.h"
+
+#include "platform/SharedBuffer.h"
+
+namespace blink {
+
+ThreadSafeDataTransport::ThreadSafeDataTransport()
+    : m_readBuffer(SharedBuffer::create())
+    , m_allDataReceived(false)
+    , m_readPosition(0)
+{
+}
+
+ThreadSafeDataTransport::~ThreadSafeDataTransport()
+{
+}
+
+void ThreadSafeDataTransport::setData(SharedBuffer* buffer, bool allDataReceived)
+{
+    ASSERT(buffer->size() >= m_readPosition);
+    Vector<RefPtr<SharedBuffer>> newBufferQueue;
+
+    const char* segment = 0;
+    while (size_t length = buffer->getSomeData(segment, m_readPosition)) {
+        m_readPosition += length;
+        newBufferQueue.append(SharedBuffer::create(segment, length));
+    }
+
+    MutexLocker locker(m_mutex);
+
+    // If all data was previously received, don't append more to it.
+    RELEASE_ASSERT(!(m_allDataReceived && newBufferQueue.size()));
+
+    m_newBufferQueue.appendVector(newBufferQueue);
+    newBufferQueue.clear();
+    m_allDataReceived = allDataReceived;
+}
+
+void ThreadSafeDataTransport::data(SharedBuffer** buffer, bool* allDataReceived)
+{
+    ASSERT(buffer);
+    ASSERT(allDataReceived);
+    Vector<RefPtr<SharedBuffer>> newBufferQueue;
+    {
+        MutexLocker lock(m_mutex);
+        m_newBufferQueue.swap(newBufferQueue);
+        *allDataReceived = m_allDataReceived;
+    }
+    for (size_t i = 0; i < newBufferQueue.size(); ++i)
+        m_readBuffer->append(newBufferQueue[i].get());
+    *buffer = m_readBuffer.get();
+}
+
+bool ThreadSafeDataTransport::hasNewData()
+{
+    MutexLocker lock(m_mutex);
+    return !m_newBufferQueue.isEmpty();
+}
+
+} // namespace blink