Hacktoberfest 2026:メンテナが10月に向けて印を付けた、オープンで初心者向けの issue。 Hacktoberfest の issue を見る

Non-styled versions of TTF fonts are chosen and artificially styled over available styled versions

オープン
#1,209 コメント 1 件 リアクション 0 件 担当者 0 名 GitHub で見る

まだ誰も着手していません。

評価

難易度
3/5
見積もり時間
1〜2日
初心者へのやさしさ
35/100
issue の種類
バグ
明瞭さ
おおむね明確
活発さ
停滞
技術スタック
java
領域
api, backend

調査の方向性

Start by tracing how FontFactory.register and FontFactory.getFont handle the registered Roboto style names and the supplied style flags. The report provides a Java reproduction using regular, italic, bold, and bold-italic TTF files, but names no source file or test. Done means the italic and bold-italic requests use their matching font files and render with the expected weight and angle.

索引モデルが issue の本文から書いたものです。

説明

bug
Describe the bug

I'm observing something similiar to what #244 described: I'm registering a bunch of TTF files (Roboto) in different styles from the class path and trying to use these. However, OpenPDF seems to choose the regular (non-styled) font file and apply all necessary styles to it instead of using the styled version in the first place.

To Reproduce

Put the Roboto files (regular, italic, bold, bold-italic; downloadable from Google Fonts) onto the classpath (e.g., the resources folder when using maven) and register them like so:

// In a class file

private static final Font ROBOTO_BOLD_ITALIC;
private static final Font ROBOTO_BOLD;
private static final Font ROBOTO_ITALIC;
private static final Font ROBOTO_REGULAR;

static {
	URL robotoRegularUrl = Thread.currentThread ().getContextClassLoader ().getResource ("fonts/Roboto-Regular.ttf");
	URL robotoBoldUrl = Thread.currentThread ().getContextClassLoader ().getResource ("fonts/Roboto-Bold.ttf");
	URL robotoItalicUrl = Thread.currentThread ().getContextClassLoader ().getResource ("fonts/Roboto-Italic.ttf");
	URL robotoBoldItalicUrl = Thread.currentThread ().getContextClassLoader ().getResource ("fonts/Roboto-BoldItalic.ttf");

	// Obviously check if any of those URLs is null

	try {
		FontFactory.register (robotoBoldItalicUrl.toExternalForm (), "Roboto-BoldItalic");
		FontFactory.register (robotoItalicUrl.toExternalForm (), "Roboto-Italic");
		FontFactory.register (robotoBoldUrl.toExternalForm (), "Roboto-Bold");
		FontFactory.register (robotoRegularUrl.toExternalForm (), "Roboto");
		
		ROBOTO_BOLD_ITALIC = FontFactory.getFont ("Roboto-BoldItalic", BaseFont.IDENTITY_H, true, 10, Font.BOLDITALIC);
		ROBOTO_BOLD = FontFactory.getFont ("Roboto-Bold", BaseFont.IDENTITY_H, true, 10);
		ROBOTO_ITALIC = FontFactory.getFont ("Roboto-Italic", BaseFont.IDENTITY_H, true, 10);
		ROBOTO_REGULAR = FontFactory.getFont ("Roboto", BaseFont.IDENTITY_H, true, 10);
	} catch (Exception e) {
		e.printStackTrace ();
		throw new IllegalStateException (e);
	}
}

This will lead to all files being read. Using them like new Paragraph ("text", ROBOTO_BOLD_ITALIC); will (apparently) not use the file previously read, but rather the regular one and OpenPDF will apply all given styles to that one. This is judging by the looks of the outcome, it looks just like the PDF displayed in #244.

Curiously, if I don't specify styles at all in FontFactory.getFont, then OpenPDF will only use ROBOTO_REGULAR whenever ROBOTO_ITALIC or ROBOTO_BOLD_ITALIC should have been used. ROBOTO_BOLD works as expected though.

Expected behavior

Italic and Bold-Italic should work as expected, using the correct file supplied for them.

Screenshots

This is produced by OpenPDF:
image

This is as displayed in-browser on Google Fonts:
image

This is as displayed in LibreOffice:
image

Obviously, OpenPDF's output looks just wrong: Notice the stroke weight and inclination angle.

System
  • OS: Linux (OpenSuSE Tumbleweed)
  • Used font: Roboto
  • OpenPDF version: 2.0.1 (cannot upgrade due to this issue)
主要言語
Java
スター
4.4k
フォーク
714
PR マージ指標
30日以内にマージされた PR はありません

環境構築

はじめの一歩

  1. issue を最後まで読み、次にプロジェクトのコントリビューションガイドを読みます。
  2. 着手することを issue にコメントします — 二人が同じ作業をするのを防げます。
  3. リポジトリをフォークし、ブランチを切って変更します。
  4. issue 番号を参照したプルリクエストを送ります。

LibrePDF/OpenPDF のほかの issue

LibrePDF/OpenPDF の issue をすべて見る

似ている issue

Java の issue をもっと見る

新しい issue をメールで受け取る

初心者向けの GitHub issue を短くまとめたダイジェスト。