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https://issues.apache.org/jira/browse/PDFBOX-5784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17825928#comment-17825928
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Tilman Hausherr edited comment on PDFBOX-5784 at 3/13/24 7:44 AM:
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What I meant is that even if we replace FONTSCALE with the actual value, i.e.
2048 here, the result is still wrong in this code line:
{code:java}
float currCharWidth = font.getStringWidth(combString) / FONTSCALE * fontSize/2;
{code}
Here replacing it would be almost as if dividing by 2 once more, however the SO
person removed "/2" i.e. multiplied by 2.
Maybe we need to do similar, i.e. multiplying by (UnitsPerEm / FONTSCALE).
{{getStringWidth}} uses 1000, I couldn't find in the code that it does any
adjustment, which means that its value would be too small.
was (Author: tilman):
What I meant is that even if we replace FONTSCALE with the actual value, i.e.
2048 here, the result is still wrong in this code line:
{code:java}
float currCharWidth = font.getStringWidth(combString) / FONTSCALE * fontSize/2;
{code}
Here replacing it would be almost as if dividing by 2 once more, however the SO
person removed "/2" i.e. multiplied by 2.
Maybe we need to do the opposite, i.e. multiplying by (UnitsPerEm / FONTSCALE).
{{getStringWidth}} uses 1000, I couldn't find in the code that it does any
adjustment, which means that its value would be too small.
> AppearanceGeneratorHelper assumes fontscale 1000
> ------------------------------------------------
>
> Key: PDFBOX-5784
> URL: https://issues.apache.org/jira/browse/PDFBOX-5784
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Reporter: Tilman Hausherr
> Assignee: Maruan Sahyoun
> Priority: Major
> Attachments: screenshot-1.png, with_dividing_by_2.pdf,
> without_dividing.pdf
>
>
> The user in the attached SO question noticed that the comb adjustment needed
> a factor of 2 to work correctly. A look at the font shows UnitsPerEm = 2048.
> Sample code:
> {code:java}
> doc.getDocumentCatalog().getAcroForm().getField("field1").setValue("WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW");
> doc.getDocumentCatalog().getAcroForm().getField("field2").setValue("MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM");
> {code}
> !screenshot-1.png!
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