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:: com :: sun :: star :: rendering ::

unpublished constants group CompositeOperation
Usage Restrictions
not published
Description
These constants determine how the primitive color is combined with the background.

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:

C = Ca * Fa + Cb * Fb

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).

Since
OOo 2.0

Constants
CLEAR Clear the destination. 
SOURCE Copy source as-is to the destination. 
DESTINATION Leave the destination as-is. 
OVER Copy the source over the destination. 
UNDER Copy the source under the destination. 
INSIDE Copy the source to the destination. 
INSIDE_REVERSE Leave the destination as is. 
OUTSIDE Copy the source to the destination 
OUTSIDE_REVERSE Leave the destination as is. 
ATOP Copy the source over the destination 
ATOP_REVERSE Copy the destination over the source. 
XOR Combine source and destination by exclusive or. 
ADD Add source and destination values. 
SATURATE Saturate source and destination. 
Constants' Details
CLEAR
const byte CLEAR = 0;
Description
Clear the destination.

Clear the destination area. The function values are: Fa = Fb = 0.

SOURCE
const byte SOURCE = 1;
Description
Copy source as-is to the destination.

Copy source as-is to the destination. The function values are: Fa = 1, Fb = 0.

DESTINATION
const byte DESTINATION = 2;
Description
Leave the destination as-is.

Leave the destination as-is. The function values are: Fa = 0, Fb = 1.

OVER
const byte OVER = 3;
Description
Copy the source over the destination.

Copy the source over the destination. The function values are: Fa = 1, Fb = 1-Aa.

UNDER
const byte UNDER = 4;
Description
Copy the source under the destination.

Copy the source under the destination. The function values are: Fa = 1-Ab, Fb = 1.

INSIDE
const byte INSIDE = 5;
Description
Copy the source to the destination.

Copy the source to the destination, but limited to where the destination is. The function values are: Fa = Ab, Fb = 0.

INSIDE_REVERSE
const byte INSIDE_REVERSE = 6;
Description
Leave the destination as is.

Leave the destination as is, but only where the source was. The function values are: Fa = 0, Fb = Aa.

OUTSIDE
const byte OUTSIDE = 7;
Description
Copy the source to the destination

Copy the source to the destination, but limited to where the destination is not. The function values are: Fa = 1-Ab, Fb = 0.

OUTSIDE_REVERSE
const byte OUTSIDE_REVERSE = 8;
Description
Leave the destination as is.

Leave the destination as is, but only where the source has not been. The function values are: Fa = 0, Fb = 1-Aa.

ATOP
const byte ATOP = 9;
Description
Copy the source over the destination

Copy the source over the destination, but only where the destination is. Keep the destination. The function values are: Fa = Ab, Fb = 1-Aa.

ATOP_REVERSE
const byte ATOP_REVERSE = 10;
Description
Copy the destination over the source.

Copy the destination over the source, but only where the source is. Keep the source. The function values are: Fa = 1-Ab, Fb = Aa.

XOR
const byte XOR = 11;
Description
Combine source and destination by exclusive or.

Take only the parts where either source or destination, but not both visible. The function values are: Fa = 1-Ab, Fb = 1-Aa.

ADD
const byte ADD = 12;
Description
Add source and destination values.

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.

SATURATE
const byte SATURATE = 13;
Description
Saturate source and destination.

Saturate destination with source values. The function values are: Fa = min(1,(1-Ab)/Aa), Fb = 1

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