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  1. JDK
  2. JDK-8214374

incorrect Glyph positioning in GlyphVector when AffineTransform Y-axis inverted

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    • 2d
    • 11
    • x86_64
    • windows_10

    Description

      ADDITIONAL SYSTEM INFORMATION :
      only tested on Windows 10 but I doubt this bug is system-dependent. Default runtime settings.

      A DESCRIPTION OF THE PROBLEM :
      java.awt.Font.createGlyphVector(FontRenderContext, String) returns a GlyphVector with glyphs severely incorrectly positioned when:

      1.) FontRenderContext instance's AffineTransform is inverted on Y-Axis and is rotated
      --e.g. AffineTransform tf = AffineTransform.getScaleInstance(1, -1); tf.rotate(1, 1);

      2.) FontRenderContext's useFractionalMetrics is true

      REGRESSION : Last worked in version 10.0.2

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      run this code:

      public static void main(String[] args)
      {
      AffineTransform transform = AffineTransform.getScaleInstance(1, -1);
      transform.rotate(1, 1);
      FontRenderContext frc = new FontRenderContext(transform, true, true);
      Font font = new Font("SansSerif", 0, 12);
      GlyphVector gv = font.createGlyphVector(frc, "scooby dooby doo");
      System.out.println(gv.getVisualBounds());
      }

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      java.awt.geom.Rectangle2D$Float[x=0.37565047,y=-8.595767,w=96.350075,h=11.136932]
      ACTUAL -
      java.awt.geom.Rectangle2D$Float[x=0.17677669,y=-96.97646,w=6.032505,h=97.10905]

      ---------- BEGIN SOURCE ----------
      package test;

      import java.awt.Font;
      import java.awt.font.FontRenderContext;
      import java.awt.font.GlyphVector;
      import java.awt.geom.AffineTransform;

      public class TestFontGlyphVectorBug
      {
      public static void main(String[] args)
      {
      AffineTransform transform = AffineTransform.getScaleInstance(1, -1);
      transform.rotate(1, 1);
      FontRenderContext frc = new FontRenderContext(transform, true, true);
      Font font = new Font("SansSerif", 0, 12);
      GlyphVector gv = font.createGlyphVector(frc, "scooby dooby doo");
      System.out.println(gv.getVisualBounds());
      }
      }
      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Well, I assume the results from Font.createGlyphVector() are SUPPOSED to be identical whether your FontRenderContext's transform is Matrix A, or A.scale(1,-1), so you could check for a y-axis inverted transform, and if so, scale it by (1,-1). But you shouldn't have to do that. You should just be able to use whatever the Graphics2D instance gives you.


      FREQUENCY : always


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              prr Philip Race
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                Created:
                Updated:
                Resolved: