<AWT Dev> RFR: 8265761: Font with missed font family name is not properly printed on Windows

Alexander Scherbatiy alexsch at openjdk.java.net
Thu Apr 22 15:19:39 UTC 2021

PDFBox 1.8 uses [Graphics2D.drawGlyphVector()](https://github.com/apache/pdfbox/blob/41ae21bd4c3f304373d3b05f63af5325df248019/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/font/PDSimpleFont.java#L352)  method with scaled glyphs to print a text and PDF 2.0 uses [Graphics2D.fill()](https://github.com/apache/pdfbox/blob/4f14dee47ff821e44d9e2ff11532959d95e94d5b/pdfbox/src/main/java/org/apache/pdfbox/rendering/PageDrawer.java#L512) to print glyphs path. Both methods finally calls WPathGraphics.convertToWPath(...) in jdk on Windows which call GDI FillPath.

Using a custom PageDrawer to draw a text in PDFBox with Graphics2D.drawString() method reveals the fact that some pdf documents which are properly printed by PDFBox 1.8 and PDF 2.0 on Linux and Windows have issues with printing them on Windows.

The reason is that such docs use fonts which have empty font family name.
The awt_PrintJob.jFontToWFontA(...) method is not able to select the required font when the passed font family name is empty.

The proposed solution returns false from WPrinterJob.setFont(...) method when the font family is empty so the text printing falls back to printing a text by GDI FillPath method:

To reproduce the issue I created a simple [SampleBowMissedFamilyName.ttf](https://bugs.openjdk.java.net/secure/attachment/94344/SampleBowMissedFamilyName.ttf) font which contains only capital letters "ABCDEF" and saved it with empty font family name.

Here is a simple [PrintFontSample.java](https://bugs.openjdk.java.net/secure/attachment/94343/PrintFontSample.java) program that helps to reproduce the issue using the SampleBowMissedFamilyName.ttf font.

The PrintFontSample program draws a text using three methods:
- Graphics2D.drawString(...)
- Graphics2D.drawGlyphVector(...)
- Graphics2D.drawGlyphVector(...) using transformed glyphs 

Running the program with jdk 16 on Windows (without the fix)
>  java PrintFontSample SampleBowMissedFamilyName.ttf

shows that the first and the second lines are not properly printed: [sample-doc-without-fix.pdf](https://bugs.openjdk.java.net/secure/attachment/94345/sample-doc-without-fix.pdf)
Running the program with the fix properly prints all three lines: [sample-doc-with-fix.pdf](https://bugs.openjdk.java.net/secure/attachment/94349/sample-doc-with-fix.pdf)

The provided manual test uses the created SampleBowMissedFamilyName.ttf font with empty font family name.


Commit messages:
 - 8265761: Font with missed font family name is not properly printed on Windows

Changes: https://git.openjdk.java.net/jdk/pull/3631/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3631&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265761
  Stats: 292 lines in 3 files changed: 292 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3631.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3631/head:pull/3631

PR: https://git.openjdk.java.net/jdk/pull/3631

More information about the awt-dev mailing list