[Lazarus] TBitmap unable to Load certain BMP files..

[Dominique Louis]

Hi Sebastian,
   I'll try out your patch first as it's taken me a while to track down 
this issue, so I'll see if that works first. If it does not work, I'll 
the offending image to this thread.

Thanks,


Dominique.

Sebastian Günther wrote:
> Marco van de Voort schrieb:
>> On Sat, Feb 16, 2008 at 12:46:53AM +0100, Sebastian G?nther wrote:
>>> Dominique Louis schrieb:
>>>> Hi all
>>>>    I have the situation where a Delphi TBitmap class is able to load a 
>>>> particular .bmp image while the LCL version of TBitmap throws an 
>>>> exception.
>>> What exception is it exactly? Can you tell the value of Exception.Message?
>>>
>>>> Firstly is there a known issue with any particular types of Bitmap images?
>>> I personally encountered problems when dealing with RLE compressed 
>>> bitmaps, which are quite common.
>> Afaik the fpimage readers that lazarus uses support bi_RLE4 and bi_RLE8. So
>> it should be automagically decompressed?
> 
> Hi Marco,
> 
> 
> I don't know the internals about how the LCL does handle the image 
> loading. It seems that the LCL has its own mechanism for loading BMP 
> files. Some weeks ago, before I posted the patch for dealing with RLE 
> compressed files within Lazarus, I noticed that the LCL image loader 
> cannot deal with such files. Apparently the LCL implementation tries to 
> be more performant as the fpImage version, but cannot handle compressed 
> BMPs.
> I'm sorry about this, but actually I don't have the time to look further 
> at this topic. So someone like Mattias should either take my patch, or 
> modify LCL to use the fpImage implementation.
> 
> Greetings,
> Sebastian