On Mon, 30 Nov 2020 10:00:17 GMT, Alexander Scherbatiy <alex...@openjdk.org> wrote:
>> Printing text using GlyphVector outline has bad quality on printers with low >> DPI on Windows. >> The GDI system used for text printing on Windows accepts only integer path >> coordinates. >> Rounding GlyphVector outline coordinates leads to distorted printed text. >> >> To reproduce the issue run the >> [PrintGlyphVectorOutlineSample](https://bugs.openjdk.java.net/secure/attachment/91398/PrintGlyphVectorOutlineSample.java) >> file on Windows and select a low DPI >> printer in the printer dialog. The sample prints two lines, one using >> Graphics drawString() method and another by >> filling GlyphVector outline. Chars on the second line are distorted. >> >> It is also possible to reproduce the issue running the sample and printing >> the text to PDF: >> [fill-glyph-vector-outline.png](https://bugs.openjdk.java.net/secure/attachment/91397/fill-glyph-vector-outline.png) >> >> The proposed fix introduce "sun.java2d.print.enablePathPrecisionScale" >> property which being enabled >> scales the GDI WorldTransform down and GlyphVector outline coordinates up. >> This allows to keep some digits after a dot from being rounded. >> The value for scaling is chosen to be 1000 in the same way how it is used >> by `String trunc(float f)` method from PSPrinterJob class on Linux: >> https://github.com/openjdk/jdk/blob/ed615e3ca0d681e8e67cdbf1d5d964979ccd7888/src/java.desktop/share/classes/sun/print/PSPrinterJob.java#L1489 >> >> See the >> [fill-glyph-vector-outline-enable-path-scale-factor.png](https://bugs.openjdk.java.net/secure/attachment/91399/fill-glyph-vector-outline-enable-path-scale-factor.png) >> screenshot which shows how the GlyphVector outline is filled after the fix >> with the enabled "sun.java2d.print.enablePathPrecisionScale" option. >> >> [fill-glyph-vector-outline-diff.png](https://bugs.openjdk.java.net/secure/attachment/91400/fill-glyph-vector-outline-diff.png) >> shows difference of GlyphVector outline printing before and after the fix. > > Alexander Scherbatiy has updated the pull request incrementally with one > additional commit since the last revision: > > Remove Dsun.java2d.print.enablePathPrecisionScale property from the > PathPrecisionScaleFactorTest Marked as reviewed by serb (Reviewer). ------------- PR: https://git.openjdk.java.net/jdk/pull/1183
