graphics - .net2.0 vs .net 4.0 gdi+ difference? -


i have weird problem have application lot of involved gdi+ manipulation of pictures. such cropping zooming etc. application works fine in .net 2.0, in .net 4.0 getting reports users crashing gdi+ "out of memory" error. know "out of memory" gdi+ error catch alot of errors, why work in .net 2.0 , not on .net 4.

specifically have control draws "layers" on top of each other in order create composed bitmap. control worked fine in .net 2.0 , not in .net 4.

it secifically happens when have 10 megapixel jpeg loaded file system , applying zoom , transform image.

to give more detail. g.draw matrix scale of 4 meaning 400% bigger rotation return "out of memory error.

it happens on xp boxes , not on windows 7 boxes. difference here?

any takers...

here extent of stack trace logged caught exception.

  <event>     <timestamp>11/30/10 11:02:43.706</timestamp>     <source>appro2</source>     <eventtype>error</eventtype>     <message><![cdata[##: outofmemoryexception message: out of memory.  stack trace:    @ system.drawing.graphics.checkerrorstatus(int32 status)    @ system.drawing.graphics.drawimage(image image, rectangle destrect, int32 srcx, int32 srcy, int32 srcwidth, int32 srcheight, graphicsunit srcunit, imageattributes imageattrs, drawimageabort callback, intptr callbackdata)    @ system.drawing.graphics.drawimage(image image, rectangle destrect, int32 srcx, int32 srcy, int32 srcwidth, int32 srcheight, graphicsunit srcunit, imageattributes imageattr)    @ colorvision.graphics.layers.picture.drawbig(graphics g) in d:\colorvision_workspaces\colorvision\graphics\layers\picture.cs:line 321    @ colorvision.graphics.layercollection.drawbig(graphics e) in d:\colorvision_workspaces\colorvision\graphics\layercollection.cs:line 690]]></message>     <eventid>0</eventid>   </event>

thank time. gentle 1st question here.

0xa3 have no stack trace @ moment, exact g.draw call below: 

g.drawimage(     bmpbigpicture,     new rectangle(         destbigx,         destbigy,         (int)(destbigwidth*scale),         (int)(destbigheight*scale)),     0,     0,     bmpbigpicture.width,     bmpbigpicture.height,     graphicsunit.pixel,     imgattribs );

where scale 1s 4 400%

i faced similar issues. in case problem loh fragmentation. maybe help: large object heap fragmentation

basically newer know sure how memory allocated. away processing large set of data, app fail. problem more pop if program runs long period of time , processes large amount of data. mentioned 10 megapixels image - if lot of processing such files it's easy hit loh issue.


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