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digitalmars.D.learn - Reading image files

reply solidstate1991 <laszloszeremi outlook.com> writes:
After I couldn't figure out how to convert Imageformats' own 
format to my own (consequential read from IFImage resulted in a 
glitchy image after rendering the result) and I have no idea how 
DerelictFI works at all, I'm currently out of options. At least I 
need PNG and TGA (the latter is important as my rendering engine 
relies on transparencies), the best could be is to be able to 
read paletted bitmaps directly, which is a missing feature in 
Imageformats.
Nov 25 2016
next sibling parent =?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:
On 11/25/2016 12:10 PM, solidstate1991 wrote:

 After I couldn't figure out how to convert Imageformats' own format to
 my own (consequential read from IFImage resulted in a glitchy image
 after rendering the result) and I have no idea how DerelictFI works at
 all, I'm currently out of options. At least I need PNG and TGA (the
 latter is important as my rendering engine relies on transparencies),
 the best could be is to be able to read paletted bitmaps directly, which
 is a missing feature in Imageformats.


I'm not an expert this domain at all but I have an experimental project 
that uses ImageMagick('s C library), which supports those and many other 
image formats. I had written the following binding file for the project:

   https://github.com/acehreli/alibum/blob/master/magickwand.d

Ali
Nov 25 2016
prev sibling parent Mike Parker <aldacron gmail.com> writes:
On Friday, 25 November 2016 at 20:10:56 UTC, solidstate1991 wrote:

 
 glitchy image after rendering the result) and I have no idea 
 how DerelictFI works at all,


DerelictFI is just a binding to FreeImage, so the more relevant 
point to consider is how FreeImage works :-) Everything you need 
to know can be found at [1]. Download the FreeImage DLL for 
Windows, or install it via your package manager on other systems. 
Then add DerelictFI as a dependency to your dub configuration [2] 
(I suggest version "~>2.0.3" -- don't use the alpha version), 
then you can do this:

import derelict.freeimage.freeimage;

void main() {
     DerelictFI.load();
}

This loads the FreeImage shared library into your process space 
if it's on your system path. (on Windows, you should make sure 
the DLL is in the same directory as your executable). From then 
on, you can call FreeImage functions as per the project's 
documentation.

[1] http://freeimage.sourceforge.net/
[2] https://code.dlang.org/packages/derelict-fi
Nov 25 2016