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http://www.openoffice.org/issues/show_bug.cgi?id=100888
User hdu changed the following:
What |Old value |New value
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Target milestone|OOo 3.3 |OOo Later
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------- Additional comments from [email protected] Mon Jul 19 13:35:40 +0000
2010 -------
Experimenting with the enhancement on UNX/WIN/OSX shows that the benefit is not
worth it for the
urgent target:
- on UNX the cost is still very much dominated by the polygon drawing =>
Amdahls law
- on WIN/OSX there is no API that allows the blending of e.g. off-screen layers
on the graphics card in
the way needed for the requested functionality (i.e. the mask is first drawn on
a grayscale device, then
reinterpreted as alpha mask to be merged with a source layer onto a target
layer). Having the grayscale
image as a transparency mask as opposed to the much more common alpha mask
doesn't help either.
The canonical fallback is to get the bitmaps of both input layers, merge them
to an alpha-image and
draw them again which exactly what is already done by the
getBitmap+drawBitmapEx methods, so
there wouldn't be any significant speedup.
I'll attach the current experimental patch as baseline for further work. At
least the requested method
could be added to the output device so that middle layers could use this
interface instead of
implementing the canonical fallback by hand.
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