[OpenJDK 2D-Dev] [9] JDK-8176287 :[macosx] The print test crashed with Nimbus L&F

[Prasanta Sadhukhan]

Hi All,

Please review a jck print test crash fix for jdk9. The issue was seen 
with only Nimbus L&F which seems to use Linear gradient path
and not in other L&F (such as Aqua) .

Bug: https://bugs.openjdk.java.net/browse/JDK-8176287
webrev: http://cr.openjdk.java.net/~psadhukhan/8176287/webrev.00/

Linear Gradient path collects the gradient colors and fractions values 
in native obtained from Java and allocates several arrays to store the 
same in setupGradient() method.
It seems even after being freed, in subsequent call to the same gradient 
path routine, it may get the same allocated pointer the next time the 
array is allocated causing it to crash citing "memory being modified 
after freed".

Optimise setupGradient() method to allocate fewer pointer. The JCK test 
works now.
Also, the JDK-8162796 testcase LinearGradientPrintingTest and 
RadialGradientPrintingTest works with this optimisation.

Regards
Prasanta