On Jan 17, 2008, at 2:37 AM, Alan W. Irwin wrote:

> On 2008-01-16 22:47-0500 Hazen Babcock wrote:
>>
>> It looks like this driver scales alpha values in a different way  
>> than the
>> cairo drivers.
>
> Hazen, could you comment the second page code of example 30?  I am  
> having
> trouble following exactly what it is supposed to do.  From the  
> looks of your
> pngcairo results, it appears your second page code imposes a large red
> square on top of variously coloured small squares or a black  
> background
> between the squares.  The transparency of the large red square  
> appears to be
> opaque at the top and transparent at the bottom.

That is what I was trying to achieve. I've added some comments to  
example 30 to hopefully make this more clear.

-Hazen


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