nanogui: Thread: GdImageFromFile displays bitmaps incorrectly

Some times it happens that showing a bitmap with GdImageFromFile
some pixel (often near the border of the bitmap) are missing, i.e. the background pixels
are showed instead.
I'm currently using Microwindow vers. .0.91;
the source code is something like that :
GdDrawImageFromFile(hdc->psd, 100, 150 , 25, 25,"./info.bmp", 0);

Any help?
Thanks,
Casadei Franco

> Some times it happens that showing a bitmap with GdImageFromFile
some pixel (often near the border of the bitmap) are missing, i.e. the
background pixels
are showed instead.

Are the missing pixels supposed to be "white"?  If possible,
create a .bmp the same exact pixel size, say all red
pixels and see whether its a border problem or a color
problem.  There were known issues with white pixels
not displaying due to a transparency bug, chk src/ChangeLog.

Regards,

Greg

I noticed that reducing the color depth to 16 bits for the bitmap,
the problem does not occur any more.
Anyway the missing pixel are actually "white", but I noticed
that some of the missing pixel where in the middle area of the bitmap as 
well.
I'll try to make further checks.
Thank a lot,
Casadei Franco



----- Original Message ----- 
From: "Greg Haerr" ####@####.####
To: "Franco Casadei" ####@####.#### "NanoX Forum" 
####@####.####
Sent: Tuesday, January 30, 2007 4:49 PM
Subject: Re: [nanogui] GdImageFromFile displays bitmaps incorrectly


>> Some times it happens that showing a bitmap with GdImageFromFile
> some pixel (often near the border of the bitmap) are missing, i.e. the
> background pixels
> are showed instead.
>
> Are the missing pixels supposed to be "white"?  If possible,
> create a .bmp the same exact pixel size, say all red
> pixels and see whether its a border problem or a color
> problem.  There were known issues with white pixels
> not displaying due to a transparency bug, chk src/ChangeLog.
>
> Regards,
>
> Greg
>
> 

: I noticed that reducing the color depth to 16 bits for the bitmap,
: the problem does not occur any more.
: Anyway the missing pixel are actually "white", but I noticed
: that some of the missing pixel where in the middle area of the bitmap as 
: well.

This is a fixed bug where 32-bit colors ARGB = -1 (white, with
255 alpha), and -1 was the transparent color.  This is fixed
in the CVS code.

Regards,

Greg


: 
: >> Some times it happens that showing a bitmap with GdImageFromFile
: > some pixel (often near the border of the bitmap) are missing, i.e. the
: > background pixels
: > are showed instead.
: >
: > Are the missing pixels supposed to be "white"?  If possible,
: > create a .bmp the same exact pixel size, say all red
: > pixels and see whether its a border problem or a color
: > problem.  There were known issues with white pixels
: > not displaying due to a transparency bug, chk src/ChangeLog.
: >
: > Regards,
: >
: > Greg
: >
: > 
: 
: 
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