OpenEuphoria

Re: large bitmap

• Posted by tone.skoda at siol.net Feb 06, 2002
• 393 views

There is some cool stuff but not what i need this moment
I want to read from file only data needed, so that loading will still be
fast.

There is a bug: You need to change

integer DIBDC, DIB

to

atom DIBDC, DIB

and in  dibdraw.ew

this:

integer currentdc -- hold dc value to be more compatible for win32lib users

to this:

atom currentdc -- hold dc value to be more compatible for win32lib users

else it fails on Windows 2000, it says: type check failure for DIB (and
currentdc) but only sometimes

----- Original Message -----
From: "Mike" <vulcan at win.co.nz>
To: "EUforum" <EUforum at topica.com>
Sent: Wednesday, February 06, 2002 12:09 AM
Subject: RE: large bitmap


>
> Tone, I have just now sent an update of my dib  library to RDS. The only
> adjustments made in this release were adding 2 new demos. These demos
> show zooming and displaying only part of a bitmap (in this case a dib).
> If your computer has enough memory (ram) then this will not be a problem
> but to load 100mb might take some time..
>
> Mike
>
>
> tone.skoda at siol.net wrote:
> > First, how can I read only a part of bitmap? Let's say I have a very
> > large bitmap, 100MB, and I want to only read one rectangle out of it.
> > This is Windows bitmap (I am a little confused what types of bitmaps are
> > there, DIB?, ...)
> >
> > Second, I want to display that large bitmap zoomed out. I was thinking I
> > would only read every third byte from file, or whatever zoom there is,
> > so that loading would be much faster, especially if bitmap would be very
> > zoomed out.
>
>
>
>