On Thu, 17 Aug 2023 20:43:59 GMT, Alexey Ivanov <aiva...@openjdk.org> wrote:
> **Problem** > > Glyphs aren't stretched by applying an affine transform `scale(2, 1)` to a > font. Instead, the space between glyphs increases. > > **Root Cause** > > Bitmaps embedded in the font are used to render the glyphs; the bitmaps > aren't transformed, so white-space is seen which fills the requested > horizontal size. > > **Fix** > > Disable using embedded bitmaps if horizontal transform is different from the > vertical one. > > It's similar to [JDK-8204929](https://bugs.openjdk.org/browse/JDK-8204929) > and [JDK-8255387](https://bugs.openjdk.org/browse/JDK-8255387). > > **Test** > > When embedded bitmaps are used, the right half of the image remains filled > with the background colour. The test looks for non-white pixels in the right > half of the image. If there are only white pixels in the right half of the > image, the test fails; if there are other colours, the test passes. > > I can reproduce the problem on Windows only. Without the fix, the test > reports 6 failures for "MS Gothic", "MS PGothic" and "MS UI Gothic" fonts > when text antialiasing is off and when LCD antialiasing is enabled. If > greyscale antialiasing is enabled, the glyphs are stretched as expected, this > case was handled in JDK-8204929; it can be used as a workaround. > > All client tests pass. > > ~~The test could be *headless*, but headless systems, especially with Linux, > don't have fonts installed. Without fonts, the test is useless, therefore I > made it *headful*.~~ > > The test is *headless*. This pull request has now been integrated. Changeset: 62610203 Author: Alexey Ivanov <aiva...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/62610203f18095cbd25b456f0622bad033a65a5d Stats: 224 lines in 2 files changed: 222 ins; 0 del; 2 mod 8312555: Ideographic characters aren't stretched by AffineTransform.scale(2, 1) Ignore bitmaps embedded into fonts for non-uniform scales Reviewed-by: prr, serb ------------- PR: https://git.openjdk.org/jdk/pull/15335
