PDTrueTypeFont limits number of glyph widths to 256. This can easily be removed.
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Key: PDFBOX-696
URL: https://issues.apache.org/jira/browse/PDFBOX-696
Project: PDFBox
Issue Type: Improvement
Components: Parsing
Affects Versions: 1.1.0
Environment: Ubuntu Karmic
Reporter: Michael Berg
Currently the support for fonts with exotic glyphs are limited at best. Making
PDFBox render chinese characters has proved to be a bit of a pain ... :-)
One blocker we ran into was the limitation of glyph widths to 256 individual
widths. In PDTrueTypeFont.java, we find this in loadDescriptorDictionary():
int firstChar = 0;
int maxWidths=256;
HorizontalMetricsTable hMet = ttf.getHorizontalMetrics();
int[] widthValues = hMet.getAdvanceWidth();
List widths = new ArrayList(maxWidths);
The "int maxWidths=256" affects the remaining code so glyph widths for
codepoints larger than 256 are ignored. We found that there is no need to
impose such a limitation, and that having it makes it impossible to generate a
proper /W dictionary when generating a cidfonttype2. Simply replacing the hard
coded value 256 with the following seems to be a perfectly usable solution:
int firstChar = 0;
//int maxWidths=256; <---- No hard coded value
int maxWidths = glyphToCCode.length; // <---- rather use
the counted number of codepoints
HorizontalMetricsTable hMet = ttf.getHorizontalMetrics();
int[] widthValues = hMet.getAdvanceWidth();
List widths = new ArrayList(maxWidths);
Integer zero = new Integer( 250 );
Is it possible to have this change added to 1.2.0?
Also we would be more than happy to contribute some code that shows how you can
use PDFBox to produce PDF's containing special characters (asian, chinese etc)
by using codepoint-to-glyph mapping and copy-paste working (/tounicode). The
code allows API users to simply use UTF-8 strings and not worry about any of
the tricky font handling details.
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