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Date Posted: 18:16:29 01/09/02 Wed
Author: Michel
Subject: Re: How to change the palette of a 256 color TBitmapGraphic?
In reply to: Rich Haselbarth 's message, "Re: How to change the palette of a 256 color TBitmapGraphic?" on 11:19:45 01/09/02 Wed


Hi Rich,

Try changing the palette with the PalettePtr property.

For example,

BitmapGraphic.PalettePtr^.palPalEntry[0].peRed := 255;

The Palette property is read-only so the PalettePtr property was added at one point. If it is not available in your version EnDiGrph.TDibGraphic add,


property PalettePtr : PMaxLogPalette read GetPalettePtr;


function TDibGraphic.GetPalettePtr : PMaxLogPalette;
begin
Result := @FPalette;
end;

Best regards,

Michel


>>Hi,
>> I'm trying to change the palette of a 256 color
>>TBitmapGraphic like this:
>>var
>> Pal: array[0..255] of TPaletteEntry;
>> Image: TImage;
>>begin
>> Image := TImage.Create;
>> Image.Picture.Graphic := TBitmapGraphic.Create;
>> for I := 0 to 255 do
>> begin
>> Pal[i].peFlags:=PC_RESERVED;
>> Pal[i].peRed:=Random(255);
>> Pal[i].peGreen:=Random(255);
>> Pal[i].peBlue:=Random(255);
>> end;
>> if
>>SetPaletteEntries(TBitmapGraphic(image.picture.Graphic
>)
>>.PaletteHandle, 0, 256, Pal) <> 0 then
>>
>>RealizePalette(TBitmapGraphic(image.picture.Graphic).D
>C
>>);
>>
>> but the image will not change at all! What is the
>>problem?

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