This is an example of a backfill hook for screens that uses datatypes.library to
load the images.
The hook uses a "picture cache" with an optimized blitting algorithm to speed up
rendering.

This code is public domain, do with it what you like (e.g. writing good software
;))

Comments and suggestions are always welcome.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[unknown]                 3540   10661  33.2% -lh5- 05b4 Mar 19  1995 ImageBackFill.c
[unknown]                  519    1249  41.6% -lh5- 6a6d Mar 19  1995 ImageBackFill.h
[unknown]                  934    2105  44.4% -lh5- f16c Mar 19  1995 LayerHook.c
[unknown]                  308     497  62.0% -lh5- 64b4 Mar 19  1995 LayerHook.readme
[unknown]                  316     499  63.3% -lh5- d09f Mar  6  1995 SCOPTIONS
[unknown]                  332     542  61.3% -lh5- 6455 Mar  6  1995 SMakeFile
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         6 files    5949   15553  38.2%            Mar 22  1995