[OpenJDK 2D-Dev] RFR: 8252070: Some platform-specific BLIT optimizations are not effective

[Phil Race]

On Thu, 10 Sep 2020 22:47:53 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> Some of our code assumes that the native system(XRender, D3D, OGL) makes some
> effective optimizations, but in some cases, we can do better.
> 
> One of the areas for improvement is direct blitting. If the source is much
> bigger than the destination we should not try to copy to the non-existent area
> and could cut coordinates accordingly.
> 
> The actual change is:
>   951         Rectangle dst =
>   952                 new Rectangle(dx, dy, w, h).intersection(dstData.getBounds());
>   953         if (dst.isEmpty()) {
>   972                 // return
>   975         }
>   979         sx += dst.x - dx;
>   980         sy += dst.y - dy;
> 
> See performance data and some additional comments:
> https://bugs.openjdk.java.net/browse/JDK-8252070?focusedCommentId=14365864&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14365864
> 
> The old review request:
> https://mail.openjdk.java.net/pipermail/2d-dev/2020-August/011007.html

Marked as reviewed by prr (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/121