paintCompression and speed

[Wilhelm Sanke]

On Sat Jul 21, 2007, viktoras didziulis viktoras at ekoinf.net wrote:

> Any pointers on how paintCompression works... Dictionary says: "When an
> image is changed with a paint tool, it is recompressed the next time you
> leave the card it's on". Is this also true if imageData was directly
> updated - i.e. image gets compressed next time I leave the card it is
> on, isn't it? Or is image recompressed each time its imageData gets
> updated ? If so, likely RLE is the fastest method to choose or is it
> possible to disable paintCompression for images to get  more speed for
> image updates or RLE is the only option to go ? Or if imageData and not
> the actual image is what is displayed on screen, then may
> paintCompression have no impact on how fast imageData is being redrawn.
>
> Best wishes
> Viktoras



See Bugzilla 5113 and my accompanying test stack 
<http://www.sanke.org/Software/TestStackPaintcompression.zip>.

Handling imagedata can be up to 12 times slower with paintcompression 
set to PNG than to RLE.

Regards,

Wilhelm Sanke
<http://www.sanke.org/MetaMedia>