[OpenJDK 2D-Dev]  Review Request: 8059942 Default implementation of DrawImage.renderImageXform() should be improved for d3d/ogl
sergey.bylokhov at oracle.com
Sat Nov 15 02:32:20 UTC 2014
----- james.graham at oracle.com wrote:
> By "this code" I mean the new code that constructs a clip region from
> edges array. That only happens if the tests at 478 and 491 fail and
> those have nothing to do with bicubic or BG operations.
> BG operations get folded into INT_RGB earlier in the method so we are
> actually more likely to end early at line 499 and not need the edges
> array. bicubic has absolutely no bearing on whether we make it past
> line 499 either.
We end at line 499 only if we find a nativemask blit, which is supported by TransformHelper directly, this is not the case for most of our java loops: sw->oglsurface, surface->oglsurface. So all blits which are filter out in OGLDrawImage,renderImageXform()(note it filter out BG,bicibic,bilinear,xorComp,customComp) will use TransformHelper->egdes->blit, I guess this is not a rare case.
> BG or bicubic may force us to not use a hw loop on a hw surface, but
> they have no bearing on whether we make it down to the edges array
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