RFR: 8362204: test/jdk/sun/awt/font/TestDevTransform.java fails on Ubuntu 24.04

[Sergey Bylokhov]

This test verifies rendering consistency across three APIs: String, TextLayout, and GlyphVector. The same text is rendered using each API, and the results are expected to match.

The test logic differs slightly between the two cases:
String rendering:
1. Create surface, set scale, hint, and font
2. Apply translate, rotate, and scale transform
3. Draw the String

TextLayout/GlyphVector rendering:
1. Create surface, set scale, hint, and font
2. Create a FontRenderContext
3. Build a GlyphVector or TextLayout with the render context for the surface above
4. Apply translate, rotate, and scale transform
5. Draw the GlyphVector/TextLayout

The issue is that the String variant produces slightly different glyph positions compared to TextLayout/GlyphVector. The glyph shapes are correct, but they are shifted. This occurs in several cases:
 - With both antialiasing and fractional metrics enabled
 - When the dialog font is used (monospaced fonts are fine)
 - When mixing float and double in scaling:  "g2d.scale(1.481f, 1.481)"

The issue does not occur:
 - If the transform order is changed (scale <--> translate <--> rotate).
 - When numbers are tweaked.

I think the main issue is that the test applies transforms in a different order for String versus TextLayout/GlyphVector. These operations are not strictly equivalent, so small differences are expected. So I have modified the test:
 - Replaced mixed float + double scaling with consistent use of just float or double
 - Add coverage for monospaced fonts
Now, if failures occur, we can problemlist individual subtest instead of disabling the entire test.

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Commit messages:
 - 8362204: test/jdk/sun/awt/font/TestDevTransform.java fails on Ubuntu 24.04

Changes: https://git.openjdk.org/jdk/pull/27407/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27407&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362204
  Stats: 44 lines in 1 file changed: 40 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/27407.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27407/head:pull/27407

PR: https://git.openjdk.org/jdk/pull/27407