On Wed, 2 Sep 2026 13:14:58 GMT, Jayathirth D V <[email protected]> wrote:
> Issue: When we render text using a TrueTypeFont and LCD mode, the rendered > text is corrupted with Metal pipeline on macOS. > > Root cause: When FreeType rasterizes the LCD glyphs for TrueTypeFont it adds > padding bytes > https://github.com/openjdk/jdk/blob/master/src/java.desktop/share/native/libfontmanager/freetypeScaler.c#L1033. > So glyph width and rowBytes are not same, and when we convert this LCD Glyph > into BGRA data in MTLTextRenderer.m we are not considering this padding and > it corrupts the text. > > Fix: Use rowBytes information instead of width for LCD glyph and fill BGRA > data with proper offsets. I have also removed initialization of BGRA array to > 0, because we fill these arrays completely without any conditions. > > Initially i was thinking of manual test but using already present 'A.ttf' > test font file in JDK, i am able to capture this LCD text corruption and > create an automated test. I have kept this test generic and to run on default > pipeline on all platforms, if not needed i can make the test macOS and Metal > specific. The generic test runs fine in CI pipeline. > > --------- > - [x] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai). This pull request has now been integrated. Changeset: dbab828d Author: Jayathirth D V <[email protected]> URL: https://git.openjdk.org/jdk/commit/dbab828dd864feebaa3007890cbd4a97e33ca106 Stats: 145 lines in 3 files changed: 124 ins; 18 del; 3 mod 8349701: TrueType fonts are rendered incorrectly in VolatileImage with Metal 8367873: Tooltips Are Distorted When Frame Is Fullscreen on a HiDPI Display Reviewed-by: aghaisas, prr ------------- PR: https://git.openjdk.org/jdk/pull/32651
