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alpha gradients on pdf surface

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Maarten Mostert-2

alpha gradients on pdf surface

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.
My binaries have a version string of 1.20
Is this a known issue ??
Regards,

@+Maarten,
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Maarten Mostert-2

Re: [cairo] alpha gradients on pdf surface

Hi Uli

Le 19 sept. 2013 à 23:21, Uli Schlachter <[hidden email]> 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.

<a href="https://dl.dropboxusercontent.com/u/5848367/stakepoint 19 septembre 2013_31.pdf.zip">https://dl.dropboxusercontent.com/u/5848367/stakepoint%2019%20septembre%202013_31.pdf.zip

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!"

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Maarten Mostert-2

Re: [cairo] alpha gradients on pdf surface

Yes you are right !
The problem seems to be in OSX Preview.
I saw the arrow heads in both Adobe X and Windows 8 reader.
Regards,

@+Maarten,

Le 20 sept. 2013 à 11:32, James Cloos <[hidden email]> a écrit :

>> 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.
>
> I see the arrow heads in both of those with mupdf and ghostscript.
>
> -JimC
> --
> James Cloos <[hidden email]> OpenPGP: 1024D/ED7DAEA6

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