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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Any update?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> xorg-devel-bounces+frankr.huang=amd.com@lists.x.org
[mailto:xorg-devel-bounces+frankr.huang=amd.com@lists.x.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Huang, FrankR<br>
<b><span style='font-weight:bold'>Sent:</span></b> 2010</span></font><font
size=2 face=宋体><span lang=ZH-CN style='font-size:10.0pt;
font-family:SimSun'>Äê</span></font><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>5</span></font><font size=2
face=宋体><span lang=ZH-CN style='font-size:10.0pt;font-family:
SimSun'>ÔÂ</span></font><font size=2 face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma'>31</span></font><font size=2 face=宋体><span
lang=ZH-CN style='font-size:10.0pt;font-family:SimSun'>ÈÕ</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> 10:42<br>
<b><span style='font-weight:bold'>To:</span></b> xorg-devel@lists.x.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Premultiplied alpha
handle for driver</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi all,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
A question to ask.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
We know the premultiplied alpha will be used sometimes in blend. Is that used
in the graphics driver?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
Take an example:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
If we use a
XRenderComposite() function to do the rendering:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
XRenderComposite(dyp, PictOpOver, picture_1x1[0].pict, mask_20x20[0].pict,
win->pict, 0, 0, 0, 0, 50, 50, 40, 40);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
And the picture_1x1[0] is a ARGB picture with an alpha value; mask_20x20[0] is
a A8 picture with an alpha value.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
How the driver(do_composite) handle this two alpha value?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Frank<o:p></o:p></span></font></p>
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