Bug 37559 pixel artefacts in graphic objects in exported PDF

[Johannes Sixt]

Am 13.07.2012 23:26, schrieb Johannes Sixt:
> Am 13.07.2012 21:34, schrieb Caolán McNamara:
>> On Wed, 2012-07-11 at 21:51 +0200, Johannes Sixt wrote:
>>> Thanks. The artefacts seem to be connected to
>>> VclProcessor2D::RenderPolygonStrokePrimitive2D(). If I comment out all
>>> mpOutputDevice->DrawPolyLine() calls in that function, the artefacts
>>> vanish (the lines vanish, too, of course).
>>
>> Some antialiasing type thing stuff bleeding out which might go away with
>> the addition of some clipping area. Just a complete guess.
> 
> No. I just found out that the points are definitely part of the model,
> not just drawing artefacts. They are rendered as a polygons with only
> one line segment (2 points) with identical start and end point.
> 
> The XML of one of the rounded rectangles is:
> 
>      <draw:enhanced-geometry svg:viewBox="0 0 21600 21600"
> 	 draw:mirror-horizontal="false" draw:mirror-vertical="false"
> 	 draw:path-stretchpoint-x="10800"
> 	 draw:path-stretchpoint-y="10800"
> 	 draw:text-areas="?f3 ?f4 ?f5 ?f6"
> 	 draw:type="round-rectangle" draw:modifiers="6274"
> 	 draw:enhanced-path="M ?f7 0 X 0 ?f8 L 0 ?f9 Y ?f7 21600 L ?f10 21600 X
> 21600 ?f9 L 21600 ?f8 Y ?f10 0 Z N">
>       <draw:equation draw:name="f0" draw:formula="45"/>
>       <draw:equation draw:name="f1" draw:formula="$0 *sin(?f0 *(pi/180))"/>
>       <draw:equation draw:name="f2" draw:formula="?f1 *3163/7636"/>
>       <draw:equation draw:name="f3" draw:formula="left+?f2 "/>
>       <draw:equation draw:name="f4" draw:formula="top+?f2 "/>
>       <draw:equation draw:name="f5" draw:formula="right-?f2 "/>
>       <draw:equation draw:name="f6" draw:formula="bottom-?f2 "/>
>       <draw:equation draw:name="f7" draw:formula="left+$0 "/>
>       <draw:equation draw:name="f8" draw:formula="top+$0 "/>
>       <draw:equation draw:name="f9" draw:formula="bottom-$0 "/>
>       <draw:equation draw:name="f10" draw:formula="right-$0 "/>
>       <draw:handle draw:handle-position="$0 top"
> 	 draw:handle-switched="true" draw:handle-range-x-minimum="0"
> 	 draw:handle-range-x-maximum="10800"/>
>      </draw:enhanced-geometry>
> 
> Remove the 'draw:enhanced-path' attribute and the artefacts go away.

No, sorry. They do not go away (I just forgot to remove some debugging
stuff before the test).

Nevertheless, the internal model has those two extra polygons.

-- Hannes