## Copyright (C) 2020 Jens
## 
## This program is free software: you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
## 
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
## 
## You should have received a copy of the GNU General Public License
## along with this program.  If not, see
## <https://www.gnu.org/licenses/>.

## -*- texinfo -*- 
## @deftypefn {} {@var{retval} =} prj_load (@var{input1}, @var{input2})
##
## @seealso{}
## @end deftypefn

## Author: Jens <jens@orion>
## Created: 2020-10-04

function [im_rgb, ref_rgb] = prj_load(prj_name)
extensions = {'.png'};
name_im = ''
for i=1:length(extensions),
	ext = extensions{i}
	name_cand = strcat(prj_name, ext)
	if isfile(name_cand)
		name_im = name_cand;
		break;	
		
	end;
end;

if isempty(name_im)
	error("File Not found")
end

[im, m, a] = imread(name_im);
if length(a) == 0
	error("Alpha channel not found")
end

# Get image dimensions
[w, h, nc] = size(im)

# Get RGBA data
im_rgb = im2double(im);
im_a = im2double(a);

# Find background sample area in alpha channel
# And create reference data
ref_sample_indices = find(im_a < 0.5);
zzz = reshape(im_rgb, w*h, nc);
ref = mean(zzz(ref_sample_indices, :))
ref_rgb = toRef(ref, size(im_rgb));	

function r = toRef(ref, d)
	r = repmat(reshape(ref,1, 1, 3), d(1), d(2));
endfunction
	
endfunction