VoyForums
[ Show ]
Support VoyForums
[ Shrink ]
VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, [7], 8, 9, 10 ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Date Posted: 06:57:32 06/20/01 Wed
Author: Michel
Subject: Re: How to change the palette of a 256 color TBitmapGraphic?
In reply to: wto 's message, "Re: How to change the palette of a 256 color TBitmapGraphic?" on 19:50:44 06/19/01 Tue


Hi,

I will look into this in detail and I will create a test project.

Best regards,

Michel

>Yes, I've refreshed it(Invalidate is also tried), but
>nothing happens.
>
>>
>>Hi,
>>
>>Did you invalidate your display component, for
>example,
>>
>>Image.Invalidate or ImageScrollBox.Redraw(True) ?
>>
>>Best regards,
>>
>>Michel
>>
>>>I've tried it under 256 display mode and true-color
>>>mode,
>>>all have no effect after the change of palette.
>>>
>>>>Thank you for your answer, but after I apply
>>following
>>>>code to a TBitmapGraphic, nothing happens:
>>>>
>>>> for I := 0 to 255 do
>>>> begin
>>>>
>>BitmapGraphic.PalettePtr^.palPalEntry[I].peRed
>>>>:= 0;
>>>>
>>>>BitmapGraphic.PalettePtr^.palPalEntry[I].peGreen
>>:=0;
>>>>
>>BitmapGraphic.PalettePtr^.palPalEntry[I].peBlue
>>>> := 0;
>>>>
>>>>BitmapGraphic.PalettePtr^.palPalEntry[I].peFlags :=
>>>>PC_RESERVED;
>>>> end;
>>>>Why?
>>>>
>>>>>
>>>>>Hi,
>>>>>
>>>>>Sorry about that, I looked too quickly. Use,
>>>>>
>>>>>BitmapGraphic.PalettePtr^.palPalEntry[N].peRed :=
>X;
>>>>>
>>>>>Best regards,
>>>>>
>>>>>Michel
>>>>>>Thank you for your answer, but the property of
>>>>>>TDibGraphic.Palette is read only, so when I
>written
>>>>>>code like this:
>>>>>> BitmapGraphic.Palette.palPalEntry[N].peRed :=
>X;
>>>>>>The Delphi compiler will said "Left side
>cannot
>>>>assign
>>>>>>to" .
>>>>>>
>>>>>>>
>>>>>>>Hi,
>>>>>>>
>>>>>>>The TBitmapGraphic already exposes the palette
>>from
>>>>>>>the TDibGraphic base class.
>>>>>>>
>>>>>>>For example, you can change an entry,
>>>>>>>
>>>>>>>BitmapGraphic.Palette.palPalEntry[N].peRed := X;
>>>>>>>
>>>>>>>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.G
>r
>>a
>>>p
>>>>h
>>>>>i
>>>>>>c
>>>>>>>)
>>>>>>>>.PaletteHandle, 0, 256, Pal) <> 0 then
>>>>>>>>
>>>>>>>>RealizePalette(TBitmapGraphic(image.picture.Grap
>h
>>i
>>>c
>>>>)
>>>>>.
>>>>>>D
>>>>>>>C
>>>>>>>>);
>>>>>>>>
>>>>>>>> but the image will not change at all! What is
>>>the
>>>>>>>>problem?

[ Next Thread | Previous Thread | Next Message | Previous Message ]
[ Contact Forum Admin ]

Forum timezone: GMT-5
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.