non-PNG images in DWF drawing sources rendered upside down with AGG

[waltweltonlair]

DWF image symbols from symbol libraries created with Studio are being rendered upside down. The W2Ds in the library contain non-PNG images (WT_Image opcodes). W2Ds with PNG images (WT_PNG_Group4_Image) render correctly.

[waltweltonlair]

We had a similar problem a while back - see ticket #941. For that ticket the original problem was that W2Ds containing PNG images were drawing upside down. The correct fix was made to agr_process_pngGroup4Image (in AGGW2DRewriter.cpp), but the same code change was also made to agr_process_image. The latter method should not have been changed.

The agr_process_pngGroup4Image method calls AGGImageIO::DecodePNG which returns a buffer that already contains a pre-inverted image. Therefore the subsequent call to DrawScreenRaster needs to be done with a positive height. This was corrected for ticket #941.

But the image buffer used by agr_process_image method does not contain a pre-inverted image, and therefore the associated call to DrawScreenRaster needs to be done with a negative height.

[waltweltonlair]

Fixed in the trunk stream with submission  https://trac.osgeo.org/mapguide/changeset/3884.

[waltweltonlair]

Fixed in the 2.1 branch stream with submission  https://trac.osgeo.org/mapguide/changeset/3885.

[jbirch]

Walt, there's a new branch under /branches/2.1/MgDev I'm not sure if it matters if the DWF fixes get in there...

[waltweltonlair]

Ok, also submitted fix to the 2.1 OS branch stream:  https://trac.osgeo.org/mapguide/changeset/3886.

[waltweltonlair]

References to ticket #941 above should have been #741.