Initial import attempt, just to play with. Many things disabled/removed

ui/cc/cc/CCScrollbarLayerImpl.cpp

Index: ui/cc/cc/CCScrollbarLayerImpl.cpp
diff --git a/ui/cc/cc/CCScrollbarLayerImpl.cpp b/ui/cc/cc/CCScrollbarLayerImpl.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..95450f23d26dfb0ce93213078d5ea2c80e10a34e
--- /dev/null
+++ b/ui/cc/cc/CCScrollbarLayerImpl.cpp
@@ -0,0 +1,278 @@
+/*
+ * 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 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 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"
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "CCScrollbarLayerImpl.h"
+
+#include "ScrollbarThemeComposite.h"
+#include "cc/CCQuadCuller.h"
+#include "cc/CCTextureDrawQuad.h"
+
+namespace WebCore {
+
+PassOwnPtr<CCScrollbarLayerImpl> CCScrollbarLayerImpl::create(int id)
+{
+    return adoptPtr(new CCScrollbarLayerImpl(id));
+}
+
+CCScrollbarLayerImpl::CCScrollbarLayerImpl(int id)
+    : CCLayerImpl(id)
+    , m_scrollLayer(0)
+    , m_scrollbar(this)
+    , m_backTrackTextureId(0)
+    , m_foreTrackTextureId(0)
+    , m_thumbTextureId(0)
+{
+}
+
+namespace {
+
+FloatRect toUVRect(const IntRect& r, const IntRect& bounds)
+{
+    ASSERT(bounds.contains(r));
+    return FloatRect(static_cast<float>(r.x()) / bounds.width(), static_cast<float>(r.y()) / bounds.height(),
+                     static_cast<float>(r.width()) / bounds.width(), static_cast<float>(r.height()) / bounds.height());
+}
+
+}
+
+void CCScrollbarLayerImpl::appendQuads(CCQuadCuller& quadList, const CCSharedQuadState* sharedQuadState, bool&)
+{
+    ScrollbarThemeComposite* theme = 0; // static_cast<ScrollbarThemeComposite*>(ScrollbarTheme::theme());
+    if (!theme)
+        return;
+
+    bool premultipledAlpha = false;
+    bool flipped = false;
+    FloatRect uvRect(0, 0, 1, 1);
+    IntRect boundsRect(IntPoint(), contentBounds());
+
+    IntRect thumbRect, backTrackRect, foreTrackRect;
+    theme->splitTrack(&m_scrollbar, theme->trackRect(&m_scrollbar), backTrackRect, thumbRect, foreTrackRect);
+
+    if (m_thumbTextureId && theme->hasThumb(&m_scrollbar) && !thumbRect.isEmpty()) {
+        OwnPtr<CCTextureDrawQuad> quad = CCTextureDrawQuad::create(sharedQuadState, thumbRect, m_thumbTextureId, premultipledAlpha, uvRect, flipped);
+        quad->setNeedsBlending();
+        quadList.append(quad.release());
+    }
+
+    if (!m_backTrackTextureId)
+        return;
+
+    // We only paint the track in two parts if we were given a texture for the forward track part.
+    if (m_foreTrackTextureId && !foreTrackRect.isEmpty())
+        quadList.append(CCTextureDrawQuad::create(sharedQuadState, foreTrackRect, m_foreTrackTextureId, premultipledAlpha, toUVRect(foreTrackRect, boundsRect), flipped));
+
+    // Order matters here: since the back track texture is being drawn to the entire contents rect, we must append it after the thumb and
+    // fore track quads. The back track texture contains (and displays) the buttons.
+    if (!boundsRect.isEmpty())
+        quadList.append(CCTextureDrawQuad::create(sharedQuadState, boundsRect, m_backTrackTextureId, premultipledAlpha, uvRect, flipped));
+}
+
+
+int CCScrollbarLayerImpl::CCScrollbar::x() const
+{
+    return frameRect().x();
+}
+
+int CCScrollbarLayerImpl::CCScrollbar::y() const
+{
+    return frameRect().y();
+}
+
+int CCScrollbarLayerImpl::CCScrollbar::width() const
+{
+    return frameRect().width();
+}
+
+int CCScrollbarLayerImpl::CCScrollbar::height() const
+{
+    return frameRect().height();
+}
+
+IntSize CCScrollbarLayerImpl::CCScrollbar::size() const
+{
+    return frameRect().size();
+}
+
+IntPoint CCScrollbarLayerImpl::CCScrollbar::location() const
+{
+    return frameRect().location();
+}
+
+ScrollView* CCScrollbarLayerImpl::CCScrollbar::parent() const
+{
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+ScrollView* CCScrollbarLayerImpl::CCScrollbar::root() const
+{
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+void CCScrollbarLayerImpl::CCScrollbar::setFrameRect(const IntRect&)
+{
+    ASSERT_NOT_REACHED();
+}
+
+IntRect CCScrollbarLayerImpl::CCScrollbar::frameRect() const
+{
+    return IntRect(IntPoint(), m_owner->contentBounds());
+}
+
+void CCScrollbarLayerImpl::CCScrollbar::invalidate()
+{
+    invalidateRect(frameRect());
+}
+
+void CCScrollbarLayerImpl::CCScrollbar::invalidateRect(const IntRect&)
+{
+    ASSERT_NOT_REACHED();
+}
+
+ScrollbarOverlayStyle CCScrollbarLayerImpl::CCScrollbar::scrollbarOverlayStyle() const
+{
+    return m_owner->m_scrollbarOverlayStyle;
+}
+
+void CCScrollbarLayerImpl::CCScrollbar::getTickmarks(Vector<IntRect>& tickmarks) const
+{
+    tickmarks = m_owner->m_tickmarks;
+}
+
+bool CCScrollbarLayerImpl::CCScrollbar::isScrollableAreaActive() const
+{
+    return m_owner->m_isScrollableAreaActive;
+}
+
+bool CCScrollbarLayerImpl::CCScrollbar::isScrollViewScrollbar() const
+{
+    return m_owner->m_isScrollViewScrollbar;
+}
+
+IntPoint CCScrollbarLayerImpl::CCScrollbar::convertFromContainingWindow(const IntPoint& windowPoint)
+{
+    ASSERT_NOT_REACHED();
+    return windowPoint;
+}
+
+bool CCScrollbarLayerImpl::CCScrollbar::isCustomScrollbar() const
+{
+    return false;
+}
+
+ScrollbarOrientation CCScrollbarLayerImpl::CCScrollbar::orientation() const
+{
+    return m_owner->m_orientation;
+}
+
+int CCScrollbarLayerImpl::CCScrollbar::value() const
+{
+    if (!m_owner->m_scrollLayer)
+        return 0;
+    if (orientation() == HorizontalScrollbar)
+        return m_owner->m_scrollLayer->scrollPosition().x() + m_owner->m_scrollLayer->scrollDelta().width();
+    return m_owner->m_scrollLayer->scrollPosition().y() + m_owner->m_scrollLayer->scrollDelta().height();
+}
+
+float CCScrollbarLayerImpl::CCScrollbar::currentPos() const
+{
+    return value();
+}
+
+int CCScrollbarLayerImpl::CCScrollbar::visibleSize() const
+{
+    return totalSize() - maximum();
+}
+
+int CCScrollbarLayerImpl::CCScrollbar::totalSize() const
+{
+    if (!m_owner->m_scrollLayer || !m_owner->m_scrollLayer->children().size())
+        return 0;
+    // Copy & paste from CCLayerTreeHostImpl...
+    // FIXME: Hardcoding the first child here is weird. Think of
+    // a cleaner way to get the contentBounds on the Impl side.
+    if (orientation() == HorizontalScrollbar)
+        return m_owner->m_scrollLayer->children()[0]->bounds().width();
+    return m_owner->m_scrollLayer->children()[0]->bounds().height();
+}
+
+int CCScrollbarLayerImpl::CCScrollbar::maximum() const
+{
+    if (!m_owner->m_scrollLayer)
+        return 0;
+    if (orientation() == HorizontalScrollbar)
+        return m_owner->m_scrollLayer->maxScrollPosition().width();
+    return m_owner->m_scrollLayer->maxScrollPosition().height();
+}
+
+ScrollbarControlSize CCScrollbarLayerImpl::CCScrollbar::controlSize() const
+{
+    return m_owner->m_controlSize;
+}
+
+int CCScrollbarLayerImpl::CCScrollbar::lineStep() const
+{
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+int CCScrollbarLayerImpl::CCScrollbar::pageStep() const
+{
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+ScrollbarPart CCScrollbarLayerImpl::CCScrollbar::pressedPart() const
+{
+    return m_owner->m_pressedPart;
+}
+
+ScrollbarPart CCScrollbarLayerImpl::CCScrollbar::hoveredPart() const
+{
+    return m_owner->m_hoveredPart;
+}
+
+void CCScrollbarLayerImpl::CCScrollbar::styleChanged()
+{
+}
+
+bool CCScrollbarLayerImpl::CCScrollbar::enabled() const
+{
+    return m_owner->m_enabled;
+}
+
+void CCScrollbarLayerImpl::CCScrollbar::setEnabled(bool)
+{
+    ASSERT_NOT_REACHED();
+}
+
+}
+#endif // USE(ACCELERATED_COMPOSITING)