Name: yyT116575 Date: 11/28/2000


java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)

I'm trying to developp a 3D isometric game with Java, and so I
use very heavily the Java2D API. To avoid flickering with
animation, I use a BufferedImage to do some double buffering;
  To handle game area scrolling, I use copyArea on this buffered image.

When using the copyArea method with a buffered image graphic context,
I have a performance issue when offset values are others than both
positives integers :
  copyArea (0, 0, bounds.width, bounds.height, 10, 10) works
    very fast (I'd say 0 ms ?), whereas
  copyArea (0, 0, bounds.width, bounds.height, -10, 10)
  copyArea (0, 0, bounds.width, bounds.height, 10, -10)
  copyArea (0, 0, bounds.width, bounds.height, 0, -10)
  copyArea (0, 0, bounds.width, bounds.height, 0, 10)
  copyArea (0, 0, bounds.width, bounds.height, -10, 0)
  copyArea (0, 0, bounds.width, bounds.height, 10, 0) all work
    very slow (I've constated an average time of 300 ms on my system,
    which is a PIII 500 ...)

I've tried different kinds of rendering hinds and buffered image
types without beeing able to improve performance.
(Review ID: 112930)
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