Getimage() question?

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3 total messages Started by ken wong Mon, 13 Apr 1992 15:58

#339

Author: ken wong
Date: Mon, 13 Apr 1992 15:58

6 lines
770 bytes

Can anyone explain how getimage() read its data, I was wondering if a
image existed 64k, does that mean we will have to use huge pointer instead
of far pointer, (far pointer will wrap-around). Svgabg31.zip mention that
it can read image over 64k, does that mean it takes a far pointer as a
correction: a huge pointer as a parameter?  Any help would be appreciated.

Re: Getimage() question?

#345

Author: Marc de Boer (I88)
Date: Tue, 14 Apr 1992 14:26

40 lines
1864 bytes

kwong@isis.cs.du.edu (ken wong) writes:

>Can anyone explain how getimage() read its data, I was wondering if a
>image existed 64k, does that mean we will have to use huge pointer instead
>of far pointer, (far pointer will wrap-around). Svgabg31.zip mention that
>it can read image over 64k, does that mean it takes a far pointer as a
>correction: a huge pointer as a parameter?  Any help would be appreciated.

As a related question:
Can getimage() be skipped? Say I have a small picture. I draw in onto
the screen. Read it with getimage(). Now I want to save it in a file,
or by some other means store it. Obviously, I want to have it ready
for putimage() later without having to draw it.

I tried a few things. First, make the bitmap an int* and try to read the
image int by int.
Shorthand:

   int *bitmap;
   bitmap=malloc(size);
   getimage(bitmap);
   for (i=1;i<((int)size/(sizeof(int)));i++,bitmap++)
	printf("%d ",*bitmap);

Doesn't work. I get the first few int's fine, but then rubbish.
It looks like I get just the first row.

Help me out here!

Thanks in advance!

Marc

(mdeboer@fwi.uva.nl)
-- 
--------------------------------------------------------------------
Thanx for you input!                                   Marc de Boer
(/dev/null loved it!)                           (mdeboer@fwi.uva.nl)
--------------------------------------------------------------------

Re: Getimage() question?

#352

Author: Paul Frattaroli [DCS]
Date: Wed, 15 Apr 1992 12:36

32 lines
1571 bytes

In article <1992Apr14.142638.9159@fwi.uva.nl> mdeboer@fwi.uva.nl (Marc de Boer (I88)) writes:

[stuff deleted]

>Doesn't work. I get the first few int's fine, but then rubbish.
>It looks like I get just the first row.

Don't forget, putimage() expects an extra 2 ints at the beginning
of the bitmap which tells it how big the image is.  Or is it 3?
One for bits per pixel too.

>
>Help me out here!
>
>Thanks in advance!
>
>Marc
>
>(mdeboer@fwi.uva.nl)
>-- 
>--------------------------------------------------------------------
>Thanx for you input!                                   Marc de Boer
>(/dev/null loved it!)                           (mdeboer@fwi.uva.nl)
>--------------------------------------------------------------------

....Paul

-- 
         Paul "vi joe" Frattaroli - Department of Computing Services                      University of Waterloo  Waterloo, Ontario Canada  N2L-3G1
  < pfratar@watshine.UWaterloo.CA >       < pfratar@watserv1.UWaterloo.CA >
          [129.97.128.171]                         [129.97.129.140]
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