/usr/share/psychtoolbox-3/PsychTests/AlphaAdditionTest.m is in psychtoolbox-3-common 3.0.9+svn2579.dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | function failFlag=AlphaAdditionTest(screenNumber)
% failFlag=AlphaAdditionTest([screenNumber])
%
% Combine two alpha layers by addition and verify the result.
%
% If no return argument is provided, then TestAlphaAddition issues an error
% when a test fails. If a return argument is supplied then it signals a
% failed test only by returning true, without issuing an error.
%
% See also: AlphaBlendingTest, PsychAlphaBlending
if nargin==0
screenNumber=max(Screen('Screens'));
end
exitOnError=nargout < 1;
failFlag=0;
background=0;
w=Screen('OpenWindow', screenNumber, [], [], [], 2);
Screen('FillRect', w, background);
wRect=Screen('Rect',w);
testPlane=repmat(0:255, 256, 1);
testImage1=repmat(testPlane, [1, 1, 3]);
testImage2=repmat(rot90(testPlane), [1,1,3]);
testImageRect=RectOfMatrix(testImage1);
%calculate expected results
expectedImage=AlphaSum(testImage1, testImage2);
%write the destination matrix
Screen('BlendFunction', w, 'GL_ONE', 'GL_ZERO');
Screen('PutImage', w, testImage1, testImageRect);
Screen('BlendFunction', w, 'GL_ONE', 'GL_ONE');
Screen('PutImage', w, testImage2, testImageRect);
readbackImage=Screen('GetImage', w, testImageRect, 'backBuffer');
Screen('Flip', w);
WaitSecs(0.5);
if find(readbackImage~=expectedImage)
if exitOnError
error('Addition failed');
else
fprintf('Addition succeeded\n');
end
failFlag=1;
end
%test commutivity by interchangeing source and destination matrices
Screen('BlendFunction', w, 'GL_ONE', 'GL_ZERO');
Screen('PutImage', w, testImage2, testImageRect);
Screen('BlendFunction', w, 'GL_ONE', 'GL_ONE');
Screen('PutImage', w, testImage1, testImageRect);
readbackImage=Screen('GetImage', w, testImageRect, 'backBuffer');
Screen('Flip', w);
WaitSecs(0.5);
if find(readbackImage~=expectedImage)
if exitOnError
error('Addition failed');
else
fprintf('Addition succeeded\n');
end
failFlag=1;
end
Screen('CloseAll');
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