On 01.08.2012 20:59, Michael Meeks wrote:
On Wed, 2012-08-01 at 19:56 +0400, Ivan Timofeev wrote:
I solved the problem by the following change in renderAreaToPix:
cairo_data[x*4+0] * alpha
That appears to me to break the compositing :-) it might happen to
improve things for this case of course.
Well, now I have read about alpha compositing and cairo... :)
We use CAIRO_FORMAT_ARGB32 and the cairo manual says[1]:
Pre-multiplied alpha is used. (That is, 50% transparent red is
0x80800000, not 0x80ff0000.)
so cairo_data elements already multiplied by alpha.
[1]
http://www.cairographics.org/manual/cairo-Image-Surfaces.html#cairo-format-t
Context
- Re: [PATCH] gtk: listbox border was not rendered (continued)
Privacy Policy |
Impressum (Legal Info) |
Copyright information: Unless otherwise specified, all text and images
on this website are licensed under the
Creative Commons Attribution-Share Alike 3.0 License.
This does not include the source code of LibreOffice, which is
licensed under the Mozilla Public License (
MPLv2).
"LibreOffice" and "The Document Foundation" are
registered trademarks of their corresponding registered owners or are
in actual use as trademarks in one or more countries. Their respective
logos and icons are also subject to international copyright laws. Use
thereof is explained in our
trademark policy.