1594         // FIXME: A better solution would be to only invalidate the fixed regions when scrolling.  It's overkill to

  1594         bool shouldBlitOnFixedBackgroundImage = false;

  1595         // prevent the entire view from blitting on a scroll.

  1595 #if ENABLE(FAST_MOBILE_SCROLLING)

  1596         bool newStyleSlowScroll = newStyle && (newStyle->position() == FixedPosition || newStyle->hasFixedBackgroundImage());

  1596         // On low-powered/mobile devices, preventing blitting on a scroll can cause noticeable delays

  1597         bool oldStyleSlowScroll = m_style && (m_style->position() == FixedPosition || m_style->hasFixedBackgroundImage());

  1597         // when scrolling a page with a fixed background image. As an optimization, assuming there are

  1598         // no fixed positoned elements on the page, we can acclerate scrolling (via blitting) if we

  1599         // ignore the CSS property "background-attachment: fixed".

  1600         shouldBlitOnFixedBackgroundImage = true;

  1601 #endif

  1602 

  1603         bool newStyleSlowScroll = newStyle && !shouldBlitOnFixedBackgroundImage && newStyle->hasFixedBackgroundImage();

  1604         bool oldStyleSlowScroll = m_style && !shouldBlitOnFixedBackgroundImage && m_style->hasFixedBackgroundImage();