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#include "config.h"
#include "ScrollableLayerAndroid.h"
#if USE(ACCELERATED_COMPOSITING)
namespace WebCore {
bool ScrollableLayerAndroid::scrollTo(int x, int y) {
SkIRect scrollBounds;
getScrollRect(&scrollBounds);
if (scrollBounds.fRight == 0 && scrollBounds.fBottom == 0)
return false;
SkScalar newX = SkScalarPin(x, 0, scrollBounds.fRight);
SkScalar newY = SkScalarPin(y, 0, scrollBounds.fBottom);
// Check for no change.
if (newX == scrollBounds.fLeft && newY == scrollBounds.fTop)
return false;
SkScalar diffX = newX - scrollBounds.fLeft;
SkScalar diffY = newY - scrollBounds.fTop;
const SkPoint& pos = getPosition();
setPosition(pos.fX - diffX, pos.fY - diffY);
return true;
}
void ScrollableLayerAndroid::getScrollRect(SkIRect* out) const {
const SkPoint& pos = getPosition();
out->fLeft = m_scrollLimits.fLeft - pos.fX;
out->fTop = m_scrollLimits.fTop - pos.fY;
out->fRight = getSize().width() - m_scrollLimits.width();
out->fBottom = getSize().height() - m_scrollLimits.height();
}
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
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