• zwang (2/2) Feb 04 2005 Is there a simple library that can do conversion between a graphics file...
• =?ISO-8859-1?Q?Anders_F_Bj=F6rklund?= (11/13) Feb 04 2005 Well, SDL_Surface is a popular format for such a "2d array in memory"
• =?ISO-8859-1?Q?Anders_F_Bj=F6rklund?= (19/21) Feb 04 2005 Sorry, missed that you said "and write" in the subject.
• zwang (2/33) Feb 04 2005

zwang <nehzgnaw gmail.com> writes:

Is there a simple library that can do conversion between a graphics file 
  (png/bmp/jpg etc.) and a 2d array in memory?

=?ISO-8859-1?Q?Anders_F_Bj=F6rklund?= <afb algonet.se> writes:

zwang wrote:

 Is there a simple library that can do conversion between a graphics file 
  (png/bmp/jpg etc.) and a 2d array in memory?

Well, SDL_Surface is a popular format for such a "2d array in memory"
and SDL_image (http://www.libsdl.org/projects/SDL_image/) can be used
to read formats other than the main uncompressed BMP that SDL does...
libSDL is not written in D, but there exists D wrapper modules for it.

A more common treatment of pixel images is to use a 1D array, though ?
Usually a regular pointer, that you then offset with a number calculated
as (y * pitch) + x * bpp. Where "pitch" is the number of bytes per row 
(incl. any alignment needed), and "bpp" the number of bytes per pixel.

See http://www.libsdl.org/intro/usingvideo.html

--anders

=?ISO-8859-1?Q?Anders_F_Bj=F6rklund?= <afb algonet.se> writes:

zwang wrote: (and this is a followup to my last reply)

 Is there a simple library that can do conversion between a graphics file 
  (png/bmp/jpg etc.) and a 2d array in memory?

Sorry, missed that you said "and write" in the subject.
SDL is *not* particularly good for reading / writing...

GD is better for that: http://www.boutell.com/gd/
You will need libpng for PNG, and libjpeg for JPEG.

And, as usual, you need a D module, for the C headers.
Here's one for GD, http://www.algonet.se/~afb/d/gd.zip

Seems to be working OK, using the standard test code:
gdc -o gdtest -O2 -g gdtest.d -lgd -lpng -ljpeg gd/gd.d

http://www.algonet.se/~afb/d/gdtest.d
(something of a quick-ported C hack...)

For some sample code, see the GD manual: (in C, but)
http://www.boutell.com/gd/manual2.0.33.html#basics

--anders

PS.
Most of the headers except macros were handled OK by
my Perl hack, but one annoyance was that D complained
about the use of the variables / parameters: in, out
(the script is at http://www.algonet.se/~afb/d/h2d.pl)

zwang <nehzgnaw gmail.com> writes:

Thank you!! GD looks like what I need.

Anders F Björklund wrote:
 zwang wrote: (and this is a followup to my last reply)
 
 Is there a simple library that can do conversion between a graphics 
 file  (png/bmp/jpg etc.) and a 2d array in memory?

 
 
 Sorry, missed that you said "and write" in the subject.
 SDL is *not* particularly good for reading / writing...
 
 GD is better for that: http://www.boutell.com/gd/
 You will need libpng for PNG, and libjpeg for JPEG.
 
 And, as usual, you need a D module, for the C headers.
 Here's one for GD, http://www.algonet.se/~afb/d/gd.zip
 
 Seems to be working OK, using the standard test code:
 gdc -o gdtest -O2 -g gdtest.d -lgd -lpng -ljpeg gd/gd.d
 
 http://www.algonet.se/~afb/d/gdtest.d
 (something of a quick-ported C hack...)
 
 For some sample code, see the GD manual: (in C, but)
 http://www.boutell.com/gd/manual2.0.33.html#basics
 
 --anders
 
 PS.
 Most of the headers except macros were handled OK by
 my Perl hack, but one annoyance was that D complained
 about the use of the variables / parameters: in, out
 (the script is at http://www.algonet.se/~afb/d/h2d.pl)