remove iconRead.m

tsg_util/iconRead.m

-function cdata = iconRead(filename,guessalpha)
-% ICONREAD read an image file and convert it to CData for a HG icon.
-%
-% CDATA=ICONREAD(FILENAME)
-%   Read an image file and convert it to CData with automatic transparency
-%   handling. If the image has transparency data, PNG files sometimes do,
-%   the transparency data is used. If the image has no CData, the top left
-%   pixel is treated as the transparent color.
-%
-% CDATA=ICONREAD(FILENAME, FALSE)
-%   Same as above but supress the usage of the top left pixel for images
-%   with no transparency data. This may require the caller to handle the
-%   transparency explicitly. View the contents of this m-file for an
-%   example of how to handle transparency.
-%
-% Example:
-%
-% icon = fullfile(matlabroot,'toolbox','matlab','icons','matlabicon.gif');
-% uitoggletool('CData',iconread(icon));
-%
-% See also IMREAD.
-
-%   Copyright 1984-2006 The MathWorks, Inc.
-
-if nargin < 2
-    guessalpha = true;
-end
-
-[p,f,ext] = fileparts(filename);
-% if this is a mat-file, look for the varible cdata (or something like it)
-if isequal(lower(ext),'.mat')
-    cdata = [];
-    s = whos('-file',filename);
-    for i=1:length(s)
-        if ~isempty(strfind(lower(s(i).name), 'cdata'))
-            data = load(filename,s(i).name);
-            cdata = data.(s(i).name);
-        end
-    end
-    return
-end
-
-[cdata,map,alpha] = imread(filename);
-if isempty(cdata)
-    return;
-end
-
-if isempty(map)
-    % need to use doubles cuz nan's only work as doubles
-    cdata = double(cdata);
-    cdata = cdata/255;
-else
-    cdata = ind2rgb(cdata,map);
-end
-
-if isempty(alpha)
-    if ~guessalpha
-        return;
-    end
-    % guess the alpha pixel by using the top left pixel in the icon
-    ap1 = cdata(1,1,1);
-    ap2 = cdata(1,1,2);
-    ap3 = cdata(1,1,3);
-    alpha = cdata(:,:,1) == ap1 & cdata(:,:,2) == ap2 & cdata(:,:,3) == ap3;
-    alpha = ~alpha;
-end
-
-% process alpha data
-r = cdata(:,:,1);
-r(alpha == 0) = NaN;
-g = cdata(:,:,2);
-g(alpha == 0) = NaN;
-b = cdata(:,:,3);
-b(alpha == 0) = NaN;
-cdata = cat(3,r,g,b);