[cairo] Where's the bottleneck in using glitz/cairo/librsvg?

[Koichi Mori]

>> The backend could take care of that through caching a high-res
>> rendering and scale that to produce smaller versions.
>I do not think you want to do this, you are then downsampling
>a bitmap and any benefits of rendering from the vector
>representation are lost.

Scaling raster image, especially down scaling, does not necessarily generate
horrible result if filtered. Even bi-linear filtering should give quite good
enough quality for icons. With recent HW accelerators, bi-linear filtered
raster image scaling should not be a burden, and can be done on the fly.

As far as I know, Mac OS X's icons are bitmap and nobody questions about its
quality. Simply becasue original size is large enough (128x128), and they do
filtered scaling.

Also, I think there's no need to limit zooming level and cache all zooming
level. Just rasterize as the largest needed size and do filtered scaling
blit when drawing.

-- 
BR,
Koichi Mori
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