[cairo] generation of inefficient postscript?

[Adrian Johnson]

Jeff Muizelaar wrote:
> On Sun, Feb 10, 2008 at 08:55:00PM -0500, Adam Goode wrote:
>> It takes 3.9s to print from xpdf and about 7s from evince. Perhaps this
>> is because xpdf prints as 1 bit and cairo expands to full RGB? Still, an
>> amazing improvement!
> 
> Poppler always gives cairo RGB24 data. Do the ps/pdf backends act
> differently if given A1 data? If they do poppler could probably be
> changed to give A1 data.

The PS/PDF backends both accept A1/A8 images but the end result is
always a color image. The PDF surface embeds a black image with the
A1/A8 data in the SMask. The PS surface blends the image over a white
RGB24 surface to eliminate the transparency.