[lazarus] Wrong colours in win32

[Mattias Gaertner]

On Sat, 13 Dec 2003 18:07:28 +0100  Micha Nelissen <micha at neli.hopto.org>
wrote:

> Vincent Snijders wrote:
> 
> > On Sat, 13 Dec 2003 17:34:51 +0100
> > Micha Nelissen <micha at neli.hopto.org> wrote:
> >>
> >>Is there a way to get the lazarus logo as file, lazarus.xpm or so?
> >>Then I can make a seperate test app, debugging the ide is quite a lot
> >>of code ;-).
> >>
> >>Micha.
> > 
> > See lazarus/images/splash_logo.xpm and
> > lazarus/images/lazarus_about_logo.xpm.
> 
> Thanks for the hint. It seems this is a paletted image, is that right? 

Yes. XPM has always a palette.


> Does this indicate a failure in fpimage to load paletted images? 

No. see below.


> I assume it does work in gtk?

Yes. 


To reduce the confusion:
fpImage splitts and modularizes the reading/writing of images. 
For example the XPM reader parses a stream and converts each pixel into a
TFPColor, to call SetPixel for each pixel. So, this conversion is XPM ->
TFPColor (48bit depth). Theoretically XPM supports more than 48 bit depth,
but practically not, therefore this conversion is lossless.
The TLazIntfImage overrides the SetPixel method and sets the pixel according
to the RawImage format. This can result in loss of color information.

So, yes, the splash logo is paletted, and no, fpImage has no problem with
it.
When you save an XPM, the palette is created on the fly.


Mattias