1 files changed, 93 insertions, 0 deletions
diff --git a/Source/WebKit2/UIProcess/mac/BackingStoreMac.mm b/Source/WebKit2/UIProcess/mac/BackingStoreMac.mm
new file mode 100644
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+++ b/Source/WebKit2/UIProcess/mac/BackingStoreMac.mm
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+/*
+ * Copyright (C) 2011 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 "BackingStore.h"
+
+#include "CGUtilities.h"
+#include "ShareableBitmap.h"
+#include "UpdateInfo.h"
+#include <WebCore/GraphicsContext.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+void BackingStore::paint(PlatformGraphicsContext context, const IntRect& rect)
+{
+    ASSERT(m_bitmapContext);
+
+    paintBitmapContext(context, m_bitmapContext.get(), rect.location(), rect);
+}
+
+void BackingStore::incorporateUpdate(const UpdateInfo& updateInfo)
+{
+    ASSERT(m_size == updateInfo.viewSize);
+
+    RefPtr<ShareableBitmap> bitmap = ShareableBitmap::create(updateInfo.updateRectBounds.size(), updateInfo.bitmapHandle);
+    if (!bitmap)
+        return;
+
+    if (!m_bitmapContext) {
+        RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
+        
+        m_bitmapContext.adoptCF(CGBitmapContextCreate(0, m_size.width(), m_size.height(), 8, m_size.width() * 4, colorSpace.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
+        
+        // We want the origin to be in the top left corner so flip the backing store context.
+        CGContextTranslateCTM(m_bitmapContext.get(), 0, m_size.height());
+        CGContextScaleCTM(m_bitmapContext.get(), 1, -1);
+    }
+
+    scroll(updateInfo.scrollRect, updateInfo.scrollDelta);
+
+    IntPoint updateRectLocation = updateInfo.updateRectBounds.location();
+
+    GraphicsContext graphicsContext(m_bitmapContext.get());
+
+    // Paint all update rects.
+    for (size_t i = 0; i < updateInfo.updateRects.size(); ++i) {
+        IntRect updateRect = updateInfo.updateRects[i];
+        IntRect srcRect = updateRect;
+        srcRect.move(-updateRectLocation.x(), -updateRectLocation.y());
+
+        bitmap->paint(graphicsContext, updateRect.location(), srcRect);
+    }
+}
+
+void BackingStore::scroll(const IntRect& scrollRect, const IntSize& scrollDelta)
+{
+    if (scrollDelta.isZero())
+        return;
+
+    CGContextSaveGState(m_bitmapContext.get());
+
+    CGContextClipToRect(m_bitmapContext.get(), scrollRect);
+
+    CGPoint destination = CGPointMake(scrollRect.x() + scrollDelta.width(), scrollRect.y() + scrollDelta.height());
+    paintBitmapContext(m_bitmapContext.get(), m_bitmapContext.get(), destination, scrollRect);
+
+    CGContextRestoreGState(m_bitmapContext.get());
+}
+
+} // namespace WebKit