[cairo] Strange bug (?) when painting/cropping recording surface to PDF surface

[Guillaume Ayoub]

Hi,

Thanks for your simple example. The patch seems to fix the problem.
-- 
Guillaume

Le lun. 11 avril 2016 à 7:49, Bernhard R. Fischer 
<bf at abenteuerland.at> a écrit :
> On 2016-04-10 09:28, Adrian Johnson wrote:
>>  On 10/04/16 03:25, Bernhard R. Fischer wrote:
>>>  Hi!
>>> 
>>>  _Background_
>>>  In my project a record all drawing operations to a recording 
>>> surface.
>>>  Finally, to output files I create surfaces of specific backends 
>>> (PNG,
>>>  PDF, and SVG) and "crop" (the final surface is smaller than the
>>>  recording source surface), rotate, and paint the recording surface 
>>> to it.
>>> 
>>> 
>>>  _Strange Behavior_
>>>  When using PDF as backend, not everything is painted from the 
>>> source
>>>  (recording) surface to the PDF surface. On PNG and SVG it works as 
>>> expected.
>>> 
>>> 
>>>  _Examples_
>>>  There is a PNG and PDF example to show the behavior. Look at the 
>>> right
>>>  lower corner: right of the string "015°30" the short black lines 
>>> in the
>>>  axis are missing compared to the PNG.
>>>  http://www.abenteuerland.at/download/eagle/output.pdf
>>>  http://www.abenteuerland.at/download/eagle/output.png
>>> 
>>> 
>>>  _Trigger_
>>>  I observed, that this behavior is triggered as soon as the PDF 
>>> surface
>>>  is smaller than the recording surface.
>>> 
>>> 
>>>  _Code Snippet_
>>>  The following code snippets shows how I create the PDF and PNG 
>>> surface
>>>  from the recording surface (sfc_).
>>> 
>>> 
>>>  	/* create PDF from sfc_ */
>>>  	sfc = cairo_pdf_surface_create("output.pdf", width*.7, 
>>> height*1.3);
>>>  	dst = cairo_create(sfc);
>>>  	cairo_rotate(dst, DEG2RAD(15));
>>>  	cairo_set_source_surface(dst, sfc_, 0, 0);
>>>          cairo_paint(dst);
>>>          cairo_show_page(dst);
>>>          cairo_destroy(dst);
>>>          cairo_surface_destroy(sfc);
>>> 
>>> 
>>>  	/* create PNG from sfc_ */
>>>           sfc = cairo_image_surface_create(CAIRO_FORMAT_RGB24, 
>>> width*.7,
>>>  height*1.3);
>>>           dst = cairo_create(sfc);
>>>           cairo_rotate(dst, DEG2RAD(15));
>>>           cairo_set_source_surface(dst, sfc_, 0, 0);
>>>           cairo_paint(dst);
>>>           cairo_show_page(dst);
>>>           cairo_destroy(dst);
>>>           cairo_surface_write_to_png(sfc, "output.png");
>>>           cairo_surface_destroy(sfc);
>>> 
>>> 
>>>  Any hints appreciated.
>> 
>>  If you can provide a simple test case that reproduces the bug with 
>> the
>>  current version of cairo I can look into it.
>> 
> 
> Hi!
> 
> Please find attached a simple test program which demonstrates it.
> I tested it on Cairo 1.14.6 and 1.14.0.
> 
> 
> Bernhard
> 
> 
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