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Date Posted: 07:45:19 01/08/01 Mon
Author: Michel
Subject: Re: Draw in bitmap - 256 color palette
In reply to: Poul Halgaard 's message, "Re: Draw in bitmap - 256 color palette" on 17:17:42 01/05/01 Fri


Hi Poul,

I think I understand a bit more what you need. Envision does not handle very well 256 colors video card modes. I have spent a bit of time trying to optimize palettes and messing around with the windows "system" palette, but I prefer to concentrate on other areas of the library, as computers with video cards that don't go beyond 8 bits are becoming less and less common.

I'm still not completely sure about this problem. Does this only occur on 8 bit video adapters? In 16 bits or more, it should be possible to convert a bitmap to 256 colors and display it properly. It may be the interaction with the VCL's TBitmap.

Best regards,

Michel

>I use the funtionality in order to display 24 bit
>bitmaps on a 8 bit display so I want to handle the
>palette. But you are right - that is very troublesome
>and I hate it too, but it's the way it is ;-)
>I would regard it a functionality many people would
>want. So I'll suggest some method being able to do it.
>Maybe an assign-like method or maybe some way to get a
>palettehandle to put into the dest. TBitmap before
>using Draw to draw the bitmap into it. I would prefer
>to get a solution from you but I could also make it
>myself using the memorystream strategy, but I'm afraid
>it could be slow and I need it to be kind of fast.
>Also as I said I think many would really like to have
>this method in your lib.
>
>Rgds Poul Halgaard

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