1 files changed, 109 insertions, 0 deletions
diff --git a/Source/WebKit2/UIProcess/win/BackingStoreWin.cpp b/Source/WebKit2/UIProcess/win/BackingStoreWin.cpp
new file mode 100644
index 0000000..801376f
--- /dev/null
+++ b/Source/WebKit2/UIProcess/win/BackingStoreWin.cpp
@@ -0,0 +1,109 @@
+/*
+ * 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 "config.h"
+#include "BackingStore.h"
+
+#include "ShareableBitmap.h"
+#include "UpdateInfo.h"
+#include <WebCore/BitmapInfo.h>
+#include <WebCore/GraphicsContext.h>
+#include <WebCore/IntRect.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+class BitmapDC {
+    WTF_MAKE_NONCOPYABLE(BitmapDC);
+
+public:
+    BitmapDC(HBITMAP, HDC destinationDC);
+    ~BitmapDC();
+
+    operator HDC() const { return m_dc.get(); }
+
+private:
+    OwnPtr<HDC> m_dc;
+    HBITMAP m_originalBitmap;
+};
+
+BitmapDC::BitmapDC(HBITMAP bitmap, HDC destinationDC)
+    : m_dc(adoptPtr(::CreateCompatibleDC(destinationDC)))
+    , m_originalBitmap(static_cast<HBITMAP>(::SelectObject(m_dc.get(), bitmap)))
+{
+}
+
+BitmapDC::~BitmapDC()
+{
+    ::SelectObject(m_dc.get(), m_originalBitmap);
+}
+
+void BackingStore::paint(HDC dc, const IntRect& rect)
+{
+    ASSERT(m_bitmap);
+    ::BitBlt(dc, rect.x(), rect.y(), rect.width(), rect.height(), BitmapDC(m_bitmap.get(), dc), rect.x(), rect.y(), SRCCOPY);
+}
+
+static PassOwnPtr<HBITMAP> createBitmap(const IntSize& size)
+{
+    // FIXME: Maybe it would be better for performance to create a device-dependent bitmap here?
+    BitmapInfo info = BitmapInfo::createBottomUp(size);
+    void* bits;
+    return adoptPtr(::CreateDIBSection(0, &info, DIB_RGB_COLORS, &bits, 0, 0));
+}
+
+void BackingStore::incorporateUpdate(ShareableBitmap* bitmap, const UpdateInfo& updateInfo)
+{
+    if (!m_bitmap)
+        m_bitmap = createBitmap(m_size);
+
+    scroll(updateInfo.scrollRect, updateInfo.scrollOffset);
+
+    IntPoint updateRectLocation = updateInfo.updateRectBounds.location();
+
+    BitmapDC dc(m_bitmap.get(), 0);
+    GraphicsContext graphicsContext(dc);
+
+    // 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& scrollOffset)
+{
+    if (scrollOffset.isZero())
+        return;
+
+    RECT winScrollRect = scrollRect;
+    ::ScrollDC(BitmapDC(m_bitmap.get(), 0), scrollOffset.width(), scrollOffset.height(), &winScrollRect, &winScrollRect, 0, 0);
+}
+
+} // namespace WebKit