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Date Posted: 17:45:47 05/22/01 Tue
Author: Michel
Subject: Re: problem in TDibGraphic.Assign
In reply to: wto 's message, "Re: problem in TDibGraphic.Assign" on 10:11:52 05/22/01 Tue


I suggested using TBitmapGraphic as a workaround. If a lot of your code is based on TBitmap, this may not be a good idea.

I will be looking at this tomorrow. I need to find the orginal image for which the original fix was introduced, and make sure I don't fix one problem and introduce another.

Best regards,


> Thank you very much for your reply. You suggest me
>use TBitmapGraphic instead of TBitmap. But there is a
>problem: I have wrotten a bundle of graphic classes
>inherited from TBitmap. How should I process these
>can you give me a solution?
>>The handle type was changed to workaround a problem
>>when assigning 16 bit bitmaps. I'll have to look into
>>this in more detail before I do a change.
>>As a workaround, you may try loading your bitmap in a
>>TBitmapGraphic instead of a TBitmap.
>>Best regards,
>>>you use following code in TDibGraphic.Assign:
>>> if (Source is TBitmap) then
>>> begin
>>> { AssignFromBitmapHandle reads the X and Y
>>>resolutions }
>>> { MB Oct 28, 1999. The AssignFromBitmapHandle
>>>works with a device
>>> dependent bitmap. This is required to load
>>>16 bit bitmaps, in order
>>> to convert them to 24 bits using the GetDIB
>>>function. }
>>> TBitmap(Source).HandleType := bmDDB;
>>> end
>>>I don't know why you select to change the HandleType
>>>of the
>>>source bitmap since usually it is considered as a
>>>constant one and will not be changed in a
>>>AnotherGraphic.Assign(SourceBitmap) operation?

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