problem witrh top-down vs. bottom-up bitmaps 
Author Message
 problem witrh top-down vs. bottom-up bitmaps


when loading DIBSections from file vs. creating one in dolphin I encountered
a weird bug. While my loaded bmps are all bottom up the ones created by
dolphin are top-down. Windows uses negative biHeight in BITMAPINFOHEADER to
indicate top-down. This is nicely to be observed in the code as height is
negated on writing to BITMAPINFOHEADER in DIBSection>>createHandle. All fine
spo far, but here it comes:
When I later look into DIBSection>>getDIBSECTION, I find always positive
biHeight regardless of top-down or bottom-up. So, I have no way to determine
this status.
I guess the problem is the reading of the BITMAPINFOHEADER, not the setup,
as the images work all fine.



Tue, 28 Jun 2005 19:40:37 GMT  
 problem witrh top-down vs. bottom-up bitmaps
Hum, made some weird code to check the bottom-up condition. Cache pixel

restore cached values.

Awkward, but works. If anybody has time to check if the same
BITMAPINFOHEADER bug on reread of the DIBsSection with GDIs getObject()  is
showing up in C++, too, I would be interested in the outcome!



Sun, 03 Jul 2005 02:43:09 GMT  
 [ 2 post ] 

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