[webkit-qt] Inconsistent acceleration of linear gradients and atlas maps

[Jonathan Morton]

On Thu, 2010-07-08 at 09:41 -0700, Ariya Hidayat wrote:
> > It looks very much as though this is something that QtGui can already
> > pass straight to XRender.  So why is the Raster backend being used for
> > it instead?
> 
> There are several cases where the painter falls back to the raster engine.
> 
> But, as I mentioned before, without knowing the code path from the
> client side (WebKit) which hits some specific QPainter function in
> some particular use case, it's hard to find the root cause.
> 
> While I'm still learning graphics, usually it's not difficult for me
> to find out why, if the information above is provided.

Here are some suspicious places that showed up in the tracebacks from
XGetImage():

WebCore::GraphicsContext::fillRect
WebCore::GraphicsContext::drawRect
WebCore::Image::drawPattern
WebCore::RenderTableCell::paintCollapsedBorder
WebCore::Font::drawComplexText
QCommonStyle::drawPrimitive

All of these go straight to the Raster backend without going through any
intermediate X11 backend methods.

-- 
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From: Jonathan Morton
      jonathan.morton at movial.com