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http://www.openoffice.org/issues/show_bug.cgi?id=104784
User hdu changed the following:
What |Old value |New value
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CC|'pl' |'hdu,pl'
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Assigned to|hdu |pl
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Status|REOPENED |NEW
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------- Additional comments from [email protected] Thu Feb 25 08:57:36 +0000
2010 -------
I have analyzed this now. The problem happens on platforms where we use the
system-provided layout
services for text justification. When a font is only e.g. two pixels high then
both USP, ATSUI and
CoreText start to ignore text justification requests, especially when they
would have to stretch the line
by >20%.
Even if a line would not need to be stretched by >20% if everything was scaled
down linearly it happens
because of the way it is implemented in the ppp-preview. Font sizes get rounded
to integer
coordinates in pixel space, so e.g. when the zoom scales down the font height
from 3->2 pixels then
the relation of "requested justified line width" to "native line width at that
font height" suddenly jumps
by more than 30% and the problem is triggered.
For preview the layout fidelity is much more important than readability anyway,
so I suggest to render
to a virtualdevice with e.g. four times more resolution than the preview pane,
render onto it and then
scale it down by four. Not only the text preview would benefit from it, but
also graphics objects where
e.g. lines seem to grow with their zoom level because the current ppp-preview
approach keeps them at
a line width of one pixel.
@pl: I suggest to use the scale-down approach for the preview so that it looks
better from a layout-
fidelity aspect. It will also get rid of the problem with text lines and other
issues rounding artifacts or
non-linear scaling of geometric objects.
While I am it: @af: the slide previews have the same problems and solution
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