function varargout = modifyColorsForPrint(invertRevertFlag, varargin)

% MODIFYCOLORSFORPRINT Modify a figure's colors for printing based on

% preference settings for figure copy options.  This undocumented helper

% function is for internal use.

% This function is called during the print path.  See usage in

% alternatePrintPath.m

% MODIFYCOLORSFORPRINT('invert', h, honorColorPrefs,

% outputRendererIsPainters, outputBitmap, figbkcolorpref) can be used to

% invert the colors based on the arguments.  The return will be:

% [modified, invertedFlag, originalColor].  The invertedFlag and

% originalColor can be used when calling this function to 'revert'.

% MODIFYCOLORSFORPRINT('revert', h, invertedFlag, origColor) reverts the

% colors to their original values, before 'invert' was called.

%   Copyright 2013 The MathWorks, Inc.

    if strcmp(invertRevertFlag, 'invert') && length(varargin) == 5 

        h = varargin{1}; 

        honorColorPrefs = varargin{2}; 

        outputRendererIsPainters = varargin{3}; 

        outputBitmap = varargin{4}; 

        figbkcolorpref = varargin{5}; 

        modified = false; 

        inverted = 0; 

        origColor = []; 

        if honorColorPrefs 

            % if called from Edit->Copy Figure, check what figure

            % background setting is in place from Edit->Copy Options.  The

            % result of the copy is also dependent on the renderer and the

            % format selected.

            % figbkcolor will be one of the following:

            %    0 == 'none' (transparent)

            %    1 == white

            %    2 == use figure background

            switch figbkcolorpref

                case 0  % none/transparent background

                    if outputRendererIsPainters && ~outputBitmap

                        % Can produce transparent background

                        inverted = 2;

                        origColor = LocalColorNone(h);

                    else

                        % The user has selected transparent background, but

                        % we can't produce it either because of the

                        % renderer or the output format.  Either way,

                        % instead of creating output with black background,

                        % set it to white

                        inverted = 1;

                        adjustbackground('save', h);

                    end

                    modified = true;

                case 1  % white background

                    inverted = 1;

                    adjustbackground('save', h);

                    modified = true;

                case 2  % figure background

                    % Nothing to do in this case

            end

        else 

            if strcmp('on', get(h,'InvertHardcopy')) 

                inverted = 1; 

                adjustbackground('save', h); 

                modified = true; 

            end 

        end 

        varargout = {modified, inverted, origColor}; 

    elseif strcmp(invertRevertFlag, 'revert') 

        h = varargin{1}; 

        inverted = varargin{2}; 

        origColor = varargin{3}; 

        % Invert back the toner saving/colornone color changes

        switch inverted 

            case 1 

                % inverthardcopy == true

                adjustbackground('restore', h); 

            case 2

                % print w/transparent background == true (edit->CopyOptions)

                LocalColorNone(h, origColor);

        end 

    end 

end