[cairo] Storing vector information for drawing later
ml3p at onghu.com
Thu Nov 26 10:33:16 PST 2009
Mohit Sindhwani wrote:
> Hi Guys,
> I'm not sure if I can phrase this question correctly, but here goes.
> We're drawing a number of lines/ shapes as part of an application and a
> few times a second, we may need to rotate or zoom, etc. the image. So,
> I was wondering if there's an easy way for us to store a non-raster
> (i.e. vector) copy of the shape that we are drawing so that when the
> next turn comes around, we can easily apply the correct transformation
> to the stored shape and render. I'm not sure how much of a performance
> improvement it may have, but perhaps someone can guide if this makes any
> sense at all.
> Essentially, there's quite a bit of line_to, move_to, etc. that gets
> called in drawing the shape. Now, I'm wondering if I can collect all of
> these just before the cairo_stroke or cairo_fill and then reuse that
> somewhere else after doing a rotate or something.
> In some senses, I use the preserve API to repeat the same operation with
> 2 different line widths (a simple way to draw a thick line with a
> border), but just wondering if there's something more complex that I can
> use. Do paths offer this functionality?
Just bumping this topic, to see if anyone has any insight or links for me :)
11/27/2009 | 2:33 AM.
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