[haiku-bugs] Re: [Haiku] #9569: [WebKit] claims to support SVG but doesn't
- From: "pulkomandy" <trac@xxxxxxxxxxxx>
- Date: Fri, 03 Jan 2014 14:44:56 -0000
#9569: [WebKit] claims to support SVG but doesn't
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Reporter: waddlesplash | Owner: leavengood
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Applications/WebPositive | Version: R1/alpha4.1
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by pulkomandy):
Some more details on what's missing: WebKit SVG drawing make use of affine
transforms to translate the SVG drawing to the right place on the page.
For this to work, we need to implement GraphicsContext::concatCTM in
https://github.com/haiku/webkit/blob/rebased/Source/WebCore/platform/graphics/haiku/GraphicsContextHaiku.cpp.
This in turn requires arbitrary transformations support in BView, likely
using the existing BAffineTransform class for the API. On app_server side,
this can be converted into an agg matrix.
We still need to defie how this should be interacting with the existing
methods to set the view scale and offset. These could be applied before or
after the matrix, or they could modify the matrix instead of working
separately. Quick tests with concatCTM also show some unexpected results
with regard to clipping. I don't know if an actual implementation on BView
side would have similar problems.
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Ticket URL: <http://dev.haiku-os.org/ticket/9569#comment:6>
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