[cairo] alpha gradients on pdf surface

Maarten Mostert maarten.mostert at wanadoo.fr
Thu Sep 19 15:02:05 PDT 2013

Hi Uli

Le 19 sept. 2013 à 23:21, Uli Schlachter <psychon at znc.in> a écrit :

> Hi,
> On 19.09.2013 22:51, Maarten Mostert wrote:
>> Hi,
>> I experience a bug in linear gradients on the Cairo PDF surface. 
>> If I define any other alpha value then 1 the gradient isn't drawn anymore (leaves a blank), on other surfaces is draws fine.
> Could this be a bug in the PDF viewer? Any simple way to see this issue myself?

Here you go for two test pdf files. I use the gradients in drawing the arrow heads. I use OSX10.8.4 Preview
In the first file it leaves the blank. In the second file I set the alpha level to 1.


>> My binaries have a version string of 1.20
> Which binaries? There is no cairo 1.20.

Well these are the binaries compiled by the late Travis Griggs and included in Cincom Visualworks, in fact the method libraryVersion gives 1.10.2
I only use: libcairo.2.dylib, libpixman-1.0.dylib and libpng15.0.dylib.

>> Is this a known issue ??
> [...]
> Not yet, but thanks to you it is known now, I guess.
> Uli
> -- 
> "For saving the Earth.. and eating cheesecake!"

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.cairographics.org/archives/cairo/attachments/20130920/10f41e70/attachment.html>

More information about the cairo mailing list