On 11/21/05 4:47 PM, Peter Weilbacher wrote:
On Mon, 21 Nov 2005 19:53:13 UTC, Ian Hickson wrote:
On Mon, 21 Nov 2005, Peter Weilbacher wrote:
I wonder if it is possible to access the background color at the place
of a SVG graphic in nsSVGCairoCanvas.cpp.
The reason behind this is that due to the way the display APIs under
OS/2 work I need to "clear" the area that is going to be used for the
SVG display. Currently, I just fill it with white, but using the
background color of the <svg> (or the browser default if none is set)
would be nicer.
Isn't the SVG supposed to overlay whatever is behind it? e.g. SVG on top
of HTML would overlay that HTML?
I don't know what it should do but if there are transparent parts in the
SVG it displays with the default browser background (white in most
cases, light grey on my setup) on SeaMonkey (with cairo) under Linux. I
thought that was what it was supposed to do. Examples of this are
http://www.croczilla.com/svg/samples/linestroke/linestroke.xml
and
http://www.croczilla.com/svg/samples/xbl-shapes2/xbl-shapes2.xml
nsSVGOuterSVGFrame tells gecko that it doesn't draw a background, so we
end up just compositing atop what lies beneath us. SVG 1.1 doesn't have
an idea of a background color - that's a proposed 1.2 feature.
If the os/2 cairo backend doesn't properly implement
_aquire_dest_surface, you might want to use the image backend (see the
printing path on the branch, or the MOZ_ENABLE_{QUARTZ,WIN32}_SURFACE
defines in nsSVGCairoCanvas.cpp on the trunk.
-tor
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