1 files changed, 166 insertions, 0 deletions
diff --git a/Source/WebKit/blackberry/WebKitSupport/BackingStoreTile.cpp b/Source/WebKit/blackberry/WebKitSupport/BackingStoreTile.cpp
new file mode 100644
index 000000000..a02f93a1c
--- /dev/null
+++ b/Source/WebKit/blackberry/WebKitSupport/BackingStoreTile.cpp
@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2009, 2010, 2011, 2012 Research In Motion Limited. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include "BackingStoreTile.h"
+
+#include "GraphicsContext.h"
+#include "SurfacePool.h"
+
+#include <BlackBerryPlatformGraphics.h>
+
+namespace BlackBerry {
+namespace WebKit {
+
+TileBuffer::TileBuffer(const Platform::IntSize& size)
+    : m_size(size)
+    , m_buffer(0)
+    , m_blitGeneration(0)
+{
+}
+
+TileBuffer::~TileBuffer()
+{
+    destroyBuffer(m_buffer);
+}
+
+Platform::IntSize TileBuffer::size() const
+{
+    return m_size;
+}
+
+Platform::IntRect TileBuffer::rect() const
+{
+    return Platform::IntRect(Platform::IntPoint::zero(), m_size);
+}
+
+bool TileBuffer::isRendered() const
+{
+    return isRendered(rect());
+}
+
+bool TileBuffer::isRendered(const Platform::IntRectRegion& contents) const
+{
+    return Platform::IntRectRegion::subtractRegions(contents, m_renderedRegion).isEmpty();
+}
+
+void TileBuffer::clearRenderedRegion(const Platform::IntRectRegion& region)
+{
+    m_renderedRegion = Platform::IntRectRegion::subtractRegions(m_renderedRegion, region);
+}
+
+void TileBuffer::clearRenderedRegion()
+{
+    m_renderedRegion = Platform::IntRectRegion();
+}
+
+void TileBuffer::addRenderedRegion(const Platform::IntRectRegion& region)
+{
+    m_renderedRegion = Platform::IntRectRegion::unionRegions(region, m_renderedRegion);
+}
+
+Platform::IntRectRegion TileBuffer::renderedRegion() const
+{
+    return m_renderedRegion;
+}
+
+Platform::IntRectRegion TileBuffer::notRenderedRegion() const
+{
+    return Platform::IntRectRegion::subtractRegions(rect(), renderedRegion());
+}
+
+Platform::Graphics::Buffer* TileBuffer::nativeBuffer() const
+{
+    if (!m_buffer)
+        m_buffer = createBuffer(m_size, Platform::Graphics::TileBuffer, SurfacePool::globalSurfacePool()->sharedPixmapGroup());
+
+    return m_buffer;
+}
+
+
+BackingStoreTile::BackingStoreTile(const Platform::IntSize& size, BufferingMode mode)
+    : m_bufferingMode(mode)
+    , m_committed(false)
+    , m_backgroundPainted(false)
+    , m_horizontalShift(0)
+    , m_verticalShift(0)
+{
+    m_frontBuffer = new TileBuffer(size);
+}
+
+BackingStoreTile::~BackingStoreTile()
+{
+    delete m_frontBuffer;
+    m_frontBuffer = 0;
+}
+
+Platform::IntSize BackingStoreTile::size() const
+{
+    return frontBuffer()->size();
+}
+
+Platform::IntRect BackingStoreTile::rect() const
+{
+    return frontBuffer()->rect();
+}
+
+TileBuffer* BackingStoreTile::frontBuffer() const
+{
+    ASSERT(m_frontBuffer);
+    return m_frontBuffer;
+}
+
+TileBuffer* BackingStoreTile::backBuffer() const
+{
+    if (m_bufferingMode == SingleBuffered)
+        return frontBuffer();
+
+    return SurfacePool::globalSurfacePool()->backBuffer();
+}
+
+void BackingStoreTile::swapBuffers()
+{
+    if (m_bufferingMode == SingleBuffered)
+        return;
+
+    // Store temps.
+    unsigned front = reinterpret_cast<unsigned>(frontBuffer());
+    unsigned back = reinterpret_cast<unsigned>(backBuffer());
+
+    // Atomic change.
+    _smp_xchg(reinterpret_cast<unsigned*>(&m_frontBuffer), back);
+    _smp_xchg(reinterpret_cast<unsigned*>(&SurfacePool::globalSurfacePool()->m_backBuffer), front);
+}
+
+void BackingStoreTile::reset()
+{
+    setCommitted(false);
+    frontBuffer()->clearRenderedRegion();
+    backBuffer()->clearRenderedRegion();
+    clearShift();
+}
+
+void BackingStoreTile::paintBackground()
+{
+    m_backgroundPainted = true;
+
+    clearBuffer(backBuffer()->nativeBuffer(), 0, 0, 0, 0);
+}
+
+}
+}