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Date Posted: 16:33:53 05/29/01 Tue
Author: Jason Southwell
Subject: Re: GetDIB failed
In reply to: Michel 's message, "Re: GetDIB failed" on 06:56:30 05/29/01 Tue

I have found what appears to be a fix to this problem. Make the following change to your EnDiGrph.pas file:

Line 1006, in procedure TDibGraphic.Assign(Source: TPersistent);

Change:
{ 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;

To:
{ 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. }
if TBitmap(Source).PixelFormat = pf16Bit then
TBitmap(Source).HandleType := bmDDB
else
TBitmap(Source).HandleType := bmDIB;


This forces the component to only use a Device Dependant BMP when it needs to for 16bit graphics. 24bit graphics use Device Independant BMPs and are not dependant on the graphics hardware to build the Bitmap for you which appears to have been causing the problem.




>
>Hi Jason,
>
>I wish there was a workaround and clear answer to this
>problem.
>
>EFG's computer lab has done some testing on this, and
>there are suggestions, but none are straight forware
>to implement.
>
><a rel=nofollow target=_blank href="http://homepages.borland.com/efg2lab/Graphics/VeryLarge">http://homepages.borland.com/efg2lab/Graphics/VeryLarge</a>
>Bitmap.htm
>
>Best regards,
>
>Michel
>>I too am having this problem on some large jpgs. What
>>solution have we found to this showstopping problem?
>>
>>
>>>Hello Michel,
>>>Good to know that the error comes from the windows
>>>API. But how can it be corrected?
>>>
>>>Thanks
>>>Michael
>>>
>>>>
>>>>Hi Michael,
>>>>
>>>>I this occurring on a large image?
>>>>
>>>>This is the result of the Windows API call
>GetDIBits
>>>>failing, when retrieving pixel information from a
>>>>bitmap handle to get the pixels for the TDibGraphic
>>>>object.
>>>>
>>>>Best regards,
>>>>
>>>>Michel
>>>>
>>>>>After inserting some pictures I get suddenly the
>>>>>message "GetDIB failed". What is wrong here?
>>>>>
>>>>>Thanks
>>>>>Michael

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