[cairo] JPEG support patch

[Bill Spitzak]

You are right, cairo would not require DevIL, only the image_pattern 
types. Although if the pdf surface was able to recognize the jpeg 
image_pattern, it may mean the pdf surface would end up depending on DevIL.

Even if this was done, I think cairo should be able to *write* a png 
file without requiring DevIL, just libpng. But it may not be able to 
read a png without it.

Vladimir Vukicevic wrote:
> Bill Spitzak wrote:
>> Actually DevIL is the library I was thinking of when I was trying to 
>> make a proposal for a new cairo pattern t.
>>
>> Perhaps Cairo can just require DevIL.
> 
> What purpose would there be to having Cairo require DevIL, rather than 
> just having there be a middle layer shim library that can use DevIL to 
> load data into cairo surfaces/cairo patterns?  There isn't anything 
> preventing you from creating cairo_image_pattern_create() on top of 
> existing public cairo APIs from another library.  I wouldn't call it 
> cairo_ to avoid confusion, but something similar.
> 
>    - Vlad
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