RFR: 8377937: [macos] GlyphMetrics advance does not consider font rotation [v2]

[Phil Race]

On Wed, 25 Feb 2026 12:04:38 GMT, Daniel Gredler <dgredler at openjdk.org> wrote:

>> On macOS, `GlyphMetrics` advance provides only the x-component of the advance, not the y-component. This is usually not an issue, since most text does not have any y-component advance. However, if the font is rotated, this does cause problems.
>> 
>> This bug was discovered during fixing of the manual test `java/awt/print/PrinterJob/PrintTextTest.java` (this test is intended to test printing, but this bug was actually causing the `GlyphVector`s on page 8 to be drawn incorrectly on screen, not just on paper).
>> 
>> `FileFontStrike.getGlyphMetrics( )` was helpful as a guide regarding the expected behavior of `CStrike.getGlyphMetrics( )`.
>> 
>> Tested on mac, Linux and Windows:
>> - make test TEST="jtreg:test/jdk/java/awt/font"
>> - make test TEST="jtreg:test/jdk/java/awt/Graphics2D/DrawString"
>
> Daniel Gredler has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add defensive check for null ptr

Marked as reviewed by prr (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29726#pullrequestreview-3855795255