Re: [OpenJDK 2D-Dev] openjdk incompatibility

[Igor Nekrestyanov]

This issues now has bug id: 6761856

-igor

Phil Race wrote:

You didn't show what the result was from OpenJDK

Seems the complaint here is the that the position of the vertical bounds is suspect.

Looks like the sign is incorrect in some code that interfaces to freetype and returns glyph bounds I think bbox.yMax should be -bbox.yMax, since freetype considers the top-most coord as

the max, and that needs to be converted to 2D's coordinate system.

So this appears to be a bug in openjdk.

-phil.

Hiroshi Yamauchi wrote:

Hi,

Here's a test that indicates an incompatibility between OpenJDK6/7 and
Sun JDK. It passes on Sun JDK but not on OpenJDK. So, I believe this
is due to the difference between the two font rasterizer
implementations. The incompatibility causes a vertical position gap.

Is this a new bug, a known bug, or an implementation difference? Is
there a fix available?

If this isn't a bug, how would you suggest changing existing
applications that rely on the Sun JDK's behavior?

Thanks,
Hiroshi


import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.text.*;
import java.io.File;

public class OpenJDKFontTest {

  // Copy this ttf file from the Sun JDK
  public static final String PATH_TO_FONT = "./LucidaSansRegular.ttf";
  public static final String TEST_CONTENT = "Beds, carriers, bowls,
leashes, snacks, and more.";

  public static void testLineMeasurerBounds() throws Exception {
    Font font = Font.createFont(Font.TRUETYPE_FONT, new
File(PATH_TO_FONT)).deriveFont(62f);

AttributedString attributedString = new AttributedString(TEST_CONTENT);

    attributedString.addAttribute(TextAttribute.FONT, font);

AttributedCharacterIterator paragraph = attributedString.getIterator();

    int paragraphEnd = paragraph.getEndIndex();

    FontRenderContext frc = new FontRenderContext(null, true, true);

LineBreakMeasurer lineMeasurer = new LineBreakMeasurer(paragraph, frc);

    lineMeasurer.setPosition(paragraph.getBeginIndex());
    float desiredWidth = 882f;

    TextLayout layout = lineMeasurer.nextLayout(desiredWidth,
paragraphEnd, true);

    Rectangle2D textBox = layout.getBounds();

    Rectangle2D expected = new Rectangle2D.Float(5.78125f,
-47.796875f, 633.71484f, 57.515625f);

    if (!expected.equals(textBox)) {
      throw new RuntimeException("Not equal: <" + expected + "> <" +
textBox + ">");
    }
  }

  public static void main(String[] args) throws Exception {
    testLineMeasurerBounds();
  }

}