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#ifndef __com_sun_star_rendering_CompositeOperation_idl__
#define __com_sun_star_rendering_CompositeOperation_idl__

module com { module sun { module star { module rendering {

/** These constants determine how the primitive color is combined with
    the background.<p>

    When performing this calculations, it is assumed that all color
    values are premultiplied with the corresponding alpha values (if
    no alpha is specified, 1.0 is assumed). Then, the following
    general compositing operation is performed: 
    <p>
    C = Ca * Fa + Cb * Fb
    <p>
    where C is the result color, Ca and Cb are the input colors,
    premultiplied with alpha, and Fa and Fb are described for the
    different composite modes (wherein Aa and Ab denote source and
    destination alpha, respectively).<p>

    @since OOo 2.0
 */
constants CompositeOperation
{
    /** Clear the destination.<p>

        Clear the destination area. The function values are: Fa = Fb =
        0.<p>
     */
    const byte CLEAR = 0;

    /** Copy source as-is to the destination.<p>

        Copy source as-is to the destination. The function values are:
        Fa = 1, Fb = 0.<p>
     */
    const byte SOURCE = 1;
    
    /** Leave the destination as-is.<p>

        Leave the destination as-is. The function values are: Fa = 0,
        Fb = 1.<p>
     */
    const byte DESTINATION = 2;

    /** Copy the source over the destination.<p>
        
        Copy the source over the destination. The function values are:
        Fa = 1, Fb = 1-Aa.<p>
     */
    const byte OVER = 3;

    /** Copy the source under the destination.<p>

        Copy the source under the destination. The function values
        are: Fa = 1-Ab, Fb = 1.<p>
     */
    const byte UNDER = 4;

    /** Copy the source to the destination.<p>

        Copy the source to the destination, but limited to where the
        destination is. The function values are: Fa = Ab, Fb = 0.<p>
     */
    const byte INSIDE = 5;

    /** Leave the destination as is.<p>

        Leave the destination as is, but only where the source
        was. The function values are: Fa = 0, Fb = Aa.<p>
     */
    const byte INSIDE_REVERSE = 6;

    /** Copy the source to the destination<p>
        
        Copy the source to the destination, but limited to where the
        destination is not. The function values are: Fa = 1-Ab, Fb =
        0.<p>
     */
    const byte OUTSIDE = 7;

    /** Leave the destination as is.<p>

        Leave the destination as is, but only where the source has not
        been. The function values are: Fa = 0, Fb = 1-Aa.<p>
     */
    const byte OUTSIDE_REVERSE = 8;

    /** Copy the source over the destination<p>
        
        Copy the source over the destination, but only where the
        destination is. Keep the destination. The function values are:
        Fa = Ab, Fb = 1-Aa.<p>
     */
    const byte ATOP = 9;

    /** Copy the destination over the source.<p>

        Copy the destination over the source, but only where the
        source is. Keep the source. The function values are: Fa =
        1-Ab, Fb = Aa.<p>
     */
    const byte ATOP_REVERSE = 10;

    /** Combine source and destination by exclusive or.<p>

        Take only the parts where either source or destination, but
        not both visible. The function values are: Fa = 1-Ab, Fb =
        1-Aa.<p>
     */
    const byte XOR = 11;

    /** Add source and destination values.<p>

        Simply add contributions of both source and destination. The
        resulting color values are limited to the permissible color
        range, and clipped to the maximal value, if exceeded. The
        function values are: Fa = 1, Fb = 1.<p>
    */
    const byte ADD = 12;

    /** Saturate source and destination.<p>

        Saturate destination with source values. The function values
        are: Fa = min(1,(1-Ab)/Aa), Fb = 1<p>
     */
    const byte SATURATE = 13;
};

}; }; }; };

#endif
