[cairo] Issues with Store-Bought v. Home-Grown builds of Cairo

[Jennifer Adams]

On Jan 22, 2011, at 4:50 AM, Chris Wilson wrote:

> On Fri, 21 Jan 2011 12:31:50 -0500, Jennifer Adams  
> <jma at cola.iges.org> wrote:
>> Thanks to earlier answers I got regarding getting cairo-trace to  
>> work,
>> I created a huge trace file, but I'm not sure how to interpret it. It
>> contained ~77,000 fills and ~10,000 strokes. I reran cairo-trace with
>> the --profile option and posted it at ftp://iges.org/pub/jma/gs.89039.lzma
>>  . The output from running cairo-perf-trace on my trace file is given
>> below. I have no idea whether the trace info is helpful.
>
> The trace looks quite exciting. I never expected that so many people
> depended upon non-AA rendering; it is an area ripe for improvement  
> within
> Cairo.
I have to use non-AA rendering for the polygons because otherwise they  
can have very faint lines around the borders.

> (And also spectacularly blew up in my driver. Thanks!)
Umm... you're welcome, I guess. Is that because there were so many  
little polygons being drawn? We are working on an algorithm to merge  
adjacent polygons so in the next round there will be fewer bigger  
polygons.

> Do I have your
> permission to redistribute that trace as part of cairo-traces.git? I  
> note
> that I lapsed in not specifying exactly what copyright is on those  
> files,
> I think something BSDish is best suited for examples. (Whether you  
> consider
> the trace to be purely data or code is an interesting question and  
> depends
> upon circumstances...)
Of course, you can do whatever you want to with that trace. It's not  
my best drawing example, but if you like it ...

>
> Looking at the output of your drawing, I note that you did not align  
> any
> of your straight edges to pixel boundaries:
>
>  http://cairographics.org/FAQ/#sharp_lines
>
> If you do take the time to create sharp lines for the legend and  
> outlines,
> the graph and annotations will be much clearer; well worth the effort.
Good idea! I will think about how to set a flag for certain vertical/ 
horizontal line segments in the drawing.

--Jennifer



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