Re: BUG: CAIRO_FORMAT_ARGB32, image_surface transparency = CAIRO_IMAGE_IS_OPAQUE after write_png()

Lawrence D'Oliveiro <[email protected]>
Newsgroups gmane.comp.lib.cairo
Organization Geek Central
Message-ID <[email protected]> 
On Tue, 7 Jun 2016 08:19:47 +0930, Adrian Johnson wrote:

> Cairo analyses image transparency to ensure it uses the most
> efficient format when writing out images to
> PNG, PDF, and PS.

I don’t mind PDF and PostScript, they’re quite complicated formats. But
I thought the PNG reading/writing capability built into Cairo was
supposed to be, and I quote, “a toy API”
<https://www.cairographics.org/manual/cairo-PNG-Support.html>.

Optimizing out the alpha channel would have to count as an “advanced”
feature, not a “toy” one, I would have thought.
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