It's just a small effect that waves image around the window. C (SDL) sources
included. Currently it works only with BMP images.

400*400 test image gives ~34 FPS here (MicroA1).

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                54022  480054  11.3% -lh5- 86e8 Jun 30 12:28 WaveEffect/test.bmp
[generic]               135077  280880  48.1% -lh5- 1bf5 Jun 30 12:28 WaveEffect/wave
[generic]                 1979    5653  35.0% -lh5- f539 Jun 30 12:28 WaveEffect/wave.c
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         3 files  191078  766587  24.9%            Jul 10 00:16