From 65f03d4f644ce73618e5f4f50dd694b26f55ae12 Mon Sep 17 00:00:00 2001
From: Ben Murdoch <benm@google.com>
Date: Fri, 13 May 2011 16:23:25 +0100
Subject: Merge WebKit at r75993: Initial merge by git.

Change-Id: I602bbdc3974787a3b0450456a30a7868286921c3
---
 Source/WebKit2/Shared/ShareableBitmap.cpp | 128 ++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 Source/WebKit2/Shared/ShareableBitmap.cpp

(limited to 'Source/WebKit2/Shared/ShareableBitmap.cpp')

diff --git a/Source/WebKit2/Shared/ShareableBitmap.cpp b/Source/WebKit2/Shared/ShareableBitmap.cpp
new file mode 100644
index 0000000..90fa0d8
--- /dev/null
+++ b/Source/WebKit2/Shared/ShareableBitmap.cpp
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2010 Apple 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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 "ShareableBitmap.h"
+
+#include "SharedMemory.h"
+#include <WebCore/GraphicsContext.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+PassRefPtr<ShareableBitmap> ShareableBitmap::create(const WebCore::IntSize& size)
+{
+    size_t numBytes = numBytesForSize(size);
+    
+    void* data = 0;
+    if (!tryFastMalloc(numBytes).getValue(data))
+        return 0;
+
+    return adoptRef(new ShareableBitmap(size, data));
+}
+
+PassRefPtr<ShareableBitmap> ShareableBitmap::createShareable(const IntSize& size)
+{
+    size_t numBytes = numBytesForSize(size);
+    
+    RefPtr<SharedMemory> sharedMemory = SharedMemory::create(numBytes);
+    if (!sharedMemory)
+        return 0;
+    
+    return adoptRef(new ShareableBitmap(size, sharedMemory));
+}
+
+PassRefPtr<ShareableBitmap> ShareableBitmap::create(const WebCore::IntSize& size, const SharedMemory::Handle& handle)
+{
+    // Create the shared memory.
+    RefPtr<SharedMemory> sharedMemory = SharedMemory::create(handle, SharedMemory::ReadWrite);
+    if (!sharedMemory)
+        return 0;
+
+    size_t numBytes = numBytesForSize(size);
+    ASSERT_UNUSED(numBytes, sharedMemory->size() >= numBytes);
+
+    return adoptRef(new ShareableBitmap(size, sharedMemory));
+}
+
+bool ShareableBitmap::createHandle(SharedMemory::Handle& handle)
+{
+    ASSERT(isBackedBySharedMemory());
+
+    return m_sharedMemory->createHandle(handle, SharedMemory::ReadWrite);
+}
+
+ShareableBitmap::ShareableBitmap(const IntSize& size, void* data)
+    : m_size(size)
+    , m_data(data)
+{
+}
+
+ShareableBitmap::ShareableBitmap(const IntSize& size, PassRefPtr<SharedMemory> sharedMemory)
+    : m_size(size)
+    , m_sharedMemory(sharedMemory)
+    , m_data(0)
+{
+}
+
+ShareableBitmap::~ShareableBitmap()
+{
+    if (!isBackedBySharedMemory())
+        fastFree(m_data);
+}
+
+bool ShareableBitmap::resize(const IntSize& size)
+{
+    // We can't resize backing stores that are backed by shared memory.
+    ASSERT(!isBackedBySharedMemory());
+
+    if (size == m_size)
+        return true;
+
+    size_t newNumBytes = numBytesForSize(size);
+    
+    // Try to resize.
+    char* newData = 0;
+    if (!tryFastRealloc(m_data, newNumBytes).getValue(newData)) {
+        // We failed, but the backing store is still kept in a consistent state.
+        return false;
+    }
+
+    m_size = size;
+    m_data = newData;
+
+    return true;
+}
+
+void* ShareableBitmap::data() const
+{
+    if (isBackedBySharedMemory())
+        return m_sharedMemory->data();
+
+    ASSERT(m_data);
+    return m_data;
+}
+
+} // namespace WebKit
-- 
cgit v1.1