[cairo] Blurry page when printing pdf on windows

[Juan Garcia]

Hi again,

Am 10.06.2016 um 16:18 schrieb Juan Garcia:
> Am 10.06.2016 um 16:06 schrieb Adrian Johnson:
>> On 10/06/16 23:09, Juan Garcia wrote:
>>> Hi everybody!
>>>
>>> First of all, thank you very much for creating such an awesome library!
>>>
>>> I've encountered a small problem while using it and would really
>>> appreciate if you could give me a hand with it. If you find the time and
>>> feel like it, of course!
>>>
>>> I created the following pdf
>>> (eu-data-protection-authorities-demand-privacy-shield-clarification)
>>> with firefox:
>>>
>>> https://owncloud.m-privacy.de/index.php/s/RK88qQpaUXHN5Vg
>>> (password is 'save')
>>>
>>>
>>> With some copy paste from different sources (mostly examples from your
>>> page and poppler) I managed to implement a small cairo_pdfprinter.exe to
>>> print pdfs with windows (I actually use the code somewhere else but I
>>> created it to test and the code I am using elsewhere is exactly the same).
>>>
>>> Please find the source here (cairo_pdfprinter.c):
>>>
>>> https://owncloud.m-privacy.de/index.php/s/oY8zB0qqD5le1hd
>>> (password is also 'save')
>>>
>>> It probably has to do with
>>> cairo_surface_t* surface = cairo_win32_printing_surface_create
>>> (print_dlg->hDC);
>>>
>>> in the do_print function.
>>>
>>> Most of the time it works, but with some pdfs created with certain web
>>> pages with firefox it prints some of the pages blurred (normally not all
>>> of them). The pdf is ok. See the attached xps which I printed with the
>>> standard windows printer (this also happens with actual printers).
>>>
>>> Here the blurry xps example:
>>> https://owncloud.m-privacy.de/index.php/s/RhisnVdNhBuwa9n
>>> (password is also 'save')
>>>
>>> In the example, just the first page that appears blurry. I believe it
>>> somehow might have to do with alpha channels and was very excited when I
>>> saw there was a new version that seems to solve *exactly* my problem :)
>>>
>>> Unfortunately, after compiling the newest cairo (1.15.2), and
>>> recompiling the example I get an error which says:
>>>
>>> Assertion failed!
>>>
>>> Program: Z:\cairo_pdfprinter.exe
>>> File: cairo-recording-surface.c, Line 599
>>>
>>> Expression: ! surface->unbounded
>>>
>>> If I happen to *not* print the first page, the file *does* print.
>>>
>>> Am I doing something wrong here? Do you have any idea what could be wrong?
>>
>> No idea. Does it work using the latest cairo git and pdftocairo? 
> 
> I am going to try that right now. With pdftocairo do you mean poppler?
> 

I have built cairo from git, but unfortunately I haven't been able to do
so with poppler. And this didn't help. I still get the same error warning.

>> Does it
>> work with a different printer eg a pdf printer? 
> 
> My cairo_pdfprinter.exe has the same result no matter what printer I use.
> 
> If I use another pdf program to print the file, then it works.
> 
>> How did you build it?
> 
> I statically cross-compiled all necessary libraries using MingW. If I
> recall correctly, I didn't manage to link libtiff at the moment, but
> didn't worry too much, as I thought it wouldn't be that important.
> 

You might have been asking for the commands that I used to build it, but
I didn't understand it like that until I re-read it. Here you go:

CC=i686-w64-mingw32-gcc ./configure --host=i686-w64-mingw32
--prefix=/usr/i686-w64-mingw32 --enable-static
make -j9
make install

substituting ./configure for ./autogen.sh for the git version

>>
>>>
>>> Once again, thanks for the cool software and thank you very much for
>>> your help!
>>>
>>> Kind regards,
>>> Juanito
>>>
>>>
>>
> 
> Thank you very much!
> 

Any other ideas?

Once more, thank you!

Cheers,
Juanito