On Sun, 27 Sep 2026 18:47:22 GMT, Christopher Schnick <[email protected]> wrote:
> It seems like long ago there were tiny rendering differences encountered > between the sw and hardware renderer when rendering rounded edges. Instead of > fixing the root cause, a workaround was added to just render the affected > edges using a manual sw renderer approach. It seems like everyong forgot, and > this workaround is still here. As a result, any region with uniform corner > radius 0 < r <= 4 is rendered using a software renderering approach right now. > > Maybe the issue has been fixed somehow, the linked issue is very unspecific. > Even if not, and there are differences between the renderers, they don't > warrant this performance slowdown. I can't see a difference so far with this > workaround disabled. > > You can see this case being logged when being run with > `-Djavafx.pulseLogger=true`. According to the counters at the end of a render > pass, around 10% of nodes were rendered using this ineffecient approach in > our application. > > This case still happens for non-uniform corner radius values, but that is > somewhat expected. > > --------- > - [x] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai). There’s a comment in the bug report that says buttons appear flatter with the hardware renderer. It includes a screenshot. When the hardware renderer draws the rounded background rectangles the outermost edge pixels along the straight sides are drawn with an alpha value less than 1.0. This is causing the inner border to blend with the outer border and appear slightly darker. The software renderer doesn’t do this. I wouldn’t expect the software and hardware renderers to shape the corners in exactly the same way. It’s probably worth investigating why the hardware renderer is drawing translucent edges when the software renderer isn't. Or decide that the one pixel difference is not an issue. ------------- PR Comment: https://git.openjdk.org/jfx/pull/2329#issuecomment-6610640389
