Since "return true" would be a compliant implementation of Graphics.hitClip(),
this is not a bug...
Read the documentation, it is allowed to use fast math that can return true
when technically the answer is false...
...jim
On 6/23/16 5:04 AM, Alexandr Scherbatiy wrote:
Hello,
Could you review the fix:
bug: https://bugs.openjdk.java.net/browse/JDK-8160124
webrev: http://cr.openjdk.java.net/~alexsch/8160124/webrev.00
Let's set the clip [x=5, y=5, width=5, height=5] to a graphics and call the
hitClip() with the passed rectangle [x=0,
y=0, width=5, height=5].
The result is false for the graphics with scale 1 and true if the scale is
floating point 1.5.
This is because the transformed clip which has floating point bounds [7.5,
7.5, 7.5, 7.5] for the scale 1.5 has bounds
with rounded down upper-left and rounded up lower-right corners [7, 7, 8, 8]
which now intersects with the transformed
rectangle [0, 0, 7.5, 7.5].
The proposed fix adds additional check for the user clip and the user
rectangle intersection if the intersection with
the region clip passes.
Thanks,
Alexandr.
