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2004 May 13 02:47

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Re: [vox-tech] Success with fltk and SDL_image
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Re: [vox-tech] Success with fltk and SDL_image


  1. Texture map the image onto a 3D surface parallel to the display, then
     tell the 3D graphics card to rotate and scale the surface!  =)

  2. Get a library that does it for you from www.libsdl.org/libraries.php

  3. Do it yourself.  There are lots of websites and books that talk about
     it.  You can probably figure it out yourself with some matrix
     operations, too.

#2 is probably the most reasonable thing to do...


On Tue, 11 May 2004, Jan W wrote:

> Hi all:
> Just a question:
> Has anyone used SDL_image to do scaling and rotation?  If so, is there anything
> that I could use to do basic image manipulations?  I am looking for code
> examples/basic theories so that I can start off down a (more or less)
> reasonable path...
> I had an application that used fltk_images and libtiff to open images.  It was
> large, unwieldy, and unfortunately, a bit slow.  SDL_image was a bit faster b/c
> (at least, this is what I _think_... I'm still such a noob) of the way that I
> allocated the buffer for the image:
> (img_w)*(img_h)*(sizeof(current_color_depth)).  So if you had a 24bit depth
> color display, and a B/W image, I allocate enough space for a 24bit color...
> not the right thing...  It would have been tough to recode (for some reason
> that I can't recall), so I decided to try something different...
> Now, SDL does the work for me, and just leaves me with a surface... awesome.
> So if anyone has any hints/tips/tricks/caveats on SDL surface manipulation, I
> would love any tidbits that might float my way...  and if anyone is interested
> in seeing my code (yea, I have the coding style of an 8 year old), just don't
> laugh when you do.... (write me off list and I'll send a copy)
> --thanks
> jan

Mark K. Kim
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