Fixed a performance bug.  The stat routines would proceed down the columns rather than across rows, and this would lead to major performance degredation for scanline-cached DiskImageResources.
Fixed a performance bug.  The stat routines would proceed down the
columns rather than across rows, and this would lead to major
performance degredation for scanline-cached DiskImageResources.



AveRapina/visionworkbench,AveRapina/visionworkbench,AveRapina/visionworkbench,DougFirErickson/visionworkbench,DougFirErickson/visionworkbench,fengzhyuan/visionworkbench,DougFirErickson/visionworkbench,fengzhyuan/visionworkbench,fengzhyuan/visionworkbench,fengzhyuan/visionworkbench,AveRapina/visionworkbench,fengzhyuan/visionworkbench,AveRapina/visionworkbench,DougFirErickson/visionworkbench,AveRapina/visionworkbench,fengzhyuan/visionworkbench,DougFirErickson/visionworkbench,DougFirErickson/visionworkbench,fengzhyuan/visionworkbench