% Psychtoolbox:PsychAlphaBlending
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%  help Psychtoolbox % For an overview, triple-click me & hit enter.
%  help PsychDemos   % For demos, triple-click me & hit enter.
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%   AlphaBlend              - Simulate Alpha blending
%   AlphaDestinationTerm    - Find destination surface term of alpha sum
%   AlphaSourceTerm         - Find source surface term of alpha sum
%   AlphaSum                - Sum destination, source alpha terms and clamp 
%   AlphaTimes              - Mulitply alpha factor by image matrix.
%   GL_DST_ALPHA            - Blending factor for Screen('BlendingFunction')  
%   GL_DST_COLOR            - Blending factor for Screen('BlendingFunction') 
%   GL_ONE_MINUS_DST_ALPHA  - Blending factor for Screen('BlendingFunction') 
%   GL_ONE_MINUS_DST_COLOR  - Blending factor for Screen('BlendingFunction') 
%   GL_ONE_MINUS_SRC_ALPHA  - Blending factor for Screen('BlendingFunction') 
%   GL_ONE_MINUS_SRC_COLOR  - Blending factor for Screen('BlendingFunction') 
%   GL_ONE                  - Blending factor for Screen('BlendingFunction') 
%   GL_SRC_ALPHA_SATURATE   - Blending factor for Screen('BlendingFunction')
%   GL_SRC_ALPHA            - Blending factor for Screen('BlendingFunction')
%   GL_SRC_COLOR            - Blending factor for Screen('BlendingFunction') 
%   GL_ZERO                 - Blending factor for Screen('BlendingFunction') 
%   MaskImageIn             - Set image matrix alpha plane to include content 
%   MaskImageOut            - Set image matrix alpha plane to exclude content
%   SetDestinationAlpha     - Place destination alpha layer into an image matrix   
%   SetImageAlpha           - Set image matrix alpha plane to a scalar
%   SetSourceAlpha          - Place source alpha layer into an image matrix