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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (Jira)" <ji...@apache.org> on 2020/07/09 15:12:00 UTC
[jira] [Comment Edited] (PDFBOX-4909) Don't calculate font height
for every glyph
[ https://issues.apache.org/jira/browse/PDFBOX-4909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17154653#comment-17154653 ]
Tilman Hausherr edited comment on PDFBOX-4909 at 7/9/20, 3:11 PM:
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It turns out that this patch may solve a second problem: by replacing the height calculation when subclassing that new method.
was (Author: tilman):
It turns out that this patch may solve a second problem: replacing the height calculation by subclassing that new method.
> Don't calculate font height for every glyph
> -------------------------------------------
>
> Key: PDFBOX-4909
> URL: https://issues.apache.org/jira/browse/PDFBOX-4909
> Project: PDFBox
> Issue Type: Improvement
> Components: Text extraction
> Affects Versions: 2.0.0, 3.0.0 PDFBox
> Reporter: Alfred
> Priority: Major
> Fix For: 2.0.21, 3.0.0 PDFBox
>
> Attachments: PDFBOX-4909.patch
>
>
> LegacyPDFStreamEngine computes font height for every glyph and the computation is rather heavy, to work around all known problems.
> Instead of computing for every glyph, we can recompute only when the font changes. The SetFontAndSize operator will be invoked when the font changes so we can use that to compute and store the height to have it ready when needed in showGlyph.
>
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