.. include:: headings.inc



.. _CompositionMode:

==========================================================================================================================================
|phoenix_title|  **CompositionMode**
==========================================================================================================================================



The `CompositionMode` enumeration provides the following values:



================================================================================ ================================================================================
**Description**                                                                  **Value**
================================================================================ ================================================================================
``COMPOSITION_INVALID``                                                          Indicates invalid or unsupported composition mode.                      
``COMPOSITION_CLEAR``                                                            `R`  = 0                      
``COMPOSITION_SOURCE``                                                           `R`  = S                      
``COMPOSITION_OVER``                                                             `R`  = `S`  + `D*`(1 - `Sa`)                      
``COMPOSITION_IN``                                                               `R`  =  `S*` `Da` ``                        
``COMPOSITION_OUT``                                                              `R`  = `S*`(1 - `Da`)                      
``COMPOSITION_ATOP``                                                             `R`  =  `S*` `Da` `+`   `D*`(1 - `Sa`)                      
``COMPOSITION_DEST``                                                             `R`  = `D`, essentially a noop                      
``COMPOSITION_DEST_OVER``                                                        `R`  = `S*`(1 - `Da`) + `D`                       
``COMPOSITION_DEST_IN``                                                          `R`  =  `D*` `Sa` ``                        
``COMPOSITION_DEST_OUT``                                                         `R`  = `D*`(1 - `Sa`)                      
``COMPOSITION_DEST_ATOP``                                                        `R`  = `S*`(1 - `Da`) +  `D*` `Sa` ``                        
``COMPOSITION_XOR``                                                              `R`  = `S*`(1 - `Da`) + `D*`(1 - `Sa`)                      
``COMPOSITION_ADD``                                                              `R`  = `S`  + `D`                       
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