RFR: 8378623: Use unique font names in FormatCharAdvanceTest

[Prasanta Sadhukhan]

On Wed, 25 Feb 2026 05:36:25 GMT, Jayathirth D V <jdv at openjdk.org> wrote:

> While working on [JDK-8373290](https://bugs.openjdk.org/browse/JDK-8373290), it is noticed that with FreeType update java/awt/font/TextLayout/FormatCharAdvanceTest.java is failing.
> 
> On more analysis it is found that this Test is not using appropriate FontMetrics under FontMetrics.stringWidth() and Font.getStringBounds("AB", frc) code path. Test continues to use Type1 FontMetrics for TTF font.
> 
> Freetype update just revealed this issue as "width" slightly changes between the Type1 and TTF font used in this test(This is happening because of hinting/rounding change in FreeType update). We are not seeing any change of Metrics for other Physical(Helvetica.ttf) or Logical(Dialog) fonts.
> 
> We have separate bug [JDK-8378622](https://bugs.openjdk.org/browse/JDK-8378622) to analyse and fix FontMetrics caching issue. We are updating FormatCharAdvanceTest to use unique "font name" for both Type1 and TTF font to pick valid FontMetrics and make this test work properly. Changing the font name will not affect the purpose of this test.

test/jdk/java/awt/font/TextLayout/FormatCharAdvanceTest.java line 26:

> 24: /*
> 25:  * @test
> 26:  * @bug 8208377 6562489 8270265 8356803 8356812 4517298 8378623

we dont add test fix bugid to the tag, only product fix bugid

test/jdk/java/awt/font/TextLayout/FormatCharAdvanceTest.java line 132:

> 130:      * </pre>
> 131:      */
> 132:     private static final String TTF_BYTES = "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Did you change the ttf bytes too?

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/29910#discussion_r2856689644
PR Review Comment: https://git.openjdk.org/jdk/pull/29910#discussion_r2856692401