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EXA(4)                     Kernel Interfaces Manual                     EXA(4)



NAME
       exa - new 2D acceleration architecture for X.Org

DESCRIPTION
       EXA  provides a simple API for video drivers to implement for 2D accel-
       eration.  It is a module loaded by drivers, and is not intended  to  be
       loaded on its own.  See your driver's manual page for how to enable EXA

       The EXA architecture is designed to make accelerating the Render exten-
       sion simple and efficient, and results in various performance tradeoffs
       compared  to XAA.  Some options are available for debugging performance
       issues or driver rendering problems.  They are not intended for general
       use.

       Option "EXANoComposite" "boolean"
              Disables  acceleration  of  the Composite operation, which is at
              the heart of the Render extension.  Not related to the Composite
              extension.  Default: No.

       Option "EXANoUploadToScreen" "boolean"
              Disables  acceleration  of  uploading pixmap data to the freame-
              buffer. Default: No.

       Option "EXANoDownloadFromScreen" "boolean"
              Disables acceleration of downloading of  pixmap  data  from  the
              framebuffer.   NOTE: Not usable with drivers which rely on Down-
              loadFromScreen succeeding.  Default: No.

       Option "MigrationHeuristic" "anystr"
              Chooses an alternate pixmap migration heuristic,  for  debugging
              purposes.  The default is intended to be the best performing one
              for general use, though others may help with specific use cases.
              Available  options  include  "always",  "greedy",  and  "smart".
              Default: always.

AUTHORS
       Authors include: Keith Packard, Eric Anholt,  Zack  Rusin,  and  Michel
       Dnzer



X Version 11                   xorg-server 1.4.2                        EXA(4)