[cairo] how to substitute CAIRO_CLIP_PATH_IS_BOX ?
Enrico Weigelt, metux IT consult
enrico.weigelt at gr13.net
Thu Dec 17 16:29:33 PST 2015
On 17.12.2015 11:04, Chris Wilson wrote:
>> by the way: what's the purpose of copying the clip (instead of
>> directly using the passed one) ? is it changed somewhere ?
> We may modify the clip as we go (change it to a different form, etc).
> Mostly we try and do a shallow copy.
okay, already suspected that. but i just dont see the piece of code
which does that ... :(
>> => i915_surface_fill_with_alpha()
>>>> Another user is i915_surface_fill_with_alpha() .. I haven't really
>>>> understood, whats going on here, but it seems that we're testing
>>>> whether the fill path is is affected by the clip path (or maybe
>>>> even equal to it).
>>> Right, it tries to discard the clip path. I think that was superseded by
>>> the geometric intersection between clip and fill.
>> In which way exactly superseded ? I there any function which I could/
>> should replace it with ?
> Instead of just checking if the clip matches the fill, I would just
> intersect the fill with the clip.
Something like this ?
>>> local_clip = _cairo_clip_intersect_rectilinear_path(clip,
Shoud I do it before or after the
_cairo_composite_rectangles_init_for_fill() call ?
Oh, I've just seen that _cairo_composite_rectangles_init_for_fill()
aleady does some intersection - is that already what you meant ?
metux IT consulting
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