[OpenJDK 2D-Dev] [9] Review Request: 8059942 Default implementation of DrawImage.renderImageXform() should be improved for d3d/ogl

[Sergey Bylokhov]

Hello.
Please review the fix for jdk 9:
  - If interaction of dst&clip is empty we return immediately, without 
creation of intermediate buffers
  - Size of intermediate buffers now take into account the clip, this is 
especially effective if the we have a big scale, which much bigger than 
destination
  - One regular blit is used instead of scanline by scanline copying. 
Note that I plan to improve generation of the clip region of this method 
later.

Bug: https://bugs.openjdk.java.net/browse/JDK-8059942
Webrev can be found at: http://cr.openjdk.java.net/~serb/8059942/webrev.14

Benchmarks, note that the spread is a big(+-50% on each rerun) , because 
we generate a lot of garbage(non cached intermediate buffers):
=======================================================================
Windows 7 x64, lenovo T410, nvidia NVS 3100M

D3D: 
http://cr.openjdk.java.net/~serb/8059942/ogl_nvidia_win_fix14/results_d3d.txt
     Comparison to basis:
       Best result:      24719.07% of basis
       Worst result:     63.97% of basis
       Number of wins:   78
       Number of ties:   52
       Number of losses: 14

OGL: 
http://cr.openjdk.java.net/~serb/8059942/ogl_nvidia_win_fix14/results_ogl.txt
     Comparison to basis:
       Best result:      7797.69% of basis
       Worst result:     91.25% of basis
       Number of wins:   85
       Number of ties:   47
       Number of losses: 12

GDI: 
http://cr.openjdk.java.net/~serb/8059942/ogl_nvidia_win_fix14/results_gdi.txt
     Comparison to basis:
       Best result:      106.21% of basis
       Worst result:     81.05% of basis
       Number of wins:   32
       Number of ties:   97
       Number of losses: 15

=======================================================================
OSX 10.9.5, macbook pro retina, nvidia GeForce GT 650M 1024 MB
http://cr.openjdk.java.net/~serb/8059942/ogl_nvidia_osx_fix14/results.txt
     Comparison to basis:
       Best result:      26838.34% of basis
       Worst result:     87.3% of basis
       Number of wins:   78
       Number of ties:   62
       Number of losses: 4

=======================================================================
OSX 10.9.5, macbook pro retina, Intel HD Graphics 4000
http://cr.openjdk.java.net/~serb/8059942/ogl_intel_osx_fix14/results.txt
     Comparison to basis:
       Best result:      20700.43% of basis
       Worst result:     96.94% of basis
       Number of wins:   85
       Number of ties:   57
       Number of losses: 2

-- 
Best regards, Sergey.