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  1. JDK
  2. JDK-4481344

Performance of small image copies to screen slower in 1.4 than 1.1 (win32)

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P4 P4
    • None
    • 1.4.0
    • client-libs
    • 2d
    • x86
    • windows_nt


      This bug is being filed to take over the small-image part of bug 4276423.
      That original bug was filed against all image copies to the screen in JDK 1.2.
      Since then, we have implemented faster image copies through hardware accelerated
      images (on win32) and have seen substantial improvements in these operations
      (vs. jdk 1.1, 1.2, and 1.3).

      however, there are still performance improvements that would be nice for
      small (20x20 and less) image sizes. Here are some performance numbers
      from some testing for that other bug report:

      jdk1.1:
      20x20 37,724,773
      100x100 36,661,107
      300x300 36,808,163

      jdk1.2:
      20x20 3,631,375
      100x100 31,629,213
      300x300 43,824,489
      jdk1.3:
      20x20 3,728,680
      100x100 33,635,275
      300x300 42,096,774

      jdk1.4:
      20x20 5,750,953
      100x100 108.602,065
      300x300 165,263,578

      We should determine the bottlenecks for small image performance and try
      to eliminate them.

            chaasesunw Chet Haase (Inactive)
            chaasesunw Chet Haase (Inactive)
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