Tilman Hausherr created PDFBOX-3900:
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Summary: Optimize PDSeparation for shadings
Key: PDFBOX-3900
URL: https://issues.apache.org/jira/browse/PDFBOX-3900
Project: PDFBox
Issue Type: Improvement
Components: Rendering
Affects Versions: 2.0.7
Reporter: Tilman Hausherr
Assignee: Tilman Hausherr
Fix For: 2.0.8, 3.0.0
{{PDSeparation.toRGB()}} isn't optimized yet. It is easy to optimize because it
is a single item color. However we can't use a float key like in image
conversion (which is optimized) because the method is called by shading, so
there may be an infinite number of keys and not just 256. Thus we'll multiply
with 255, cast to int and use that as key. Due to the different intervals, the
map can't be shared with the map from the two other conversions in the class.
It isn't needed either because the PDSeparation objects are usually different,
even if it is the same indirect object in the PDF.
This optimization speeds up the rendering of [PDF.js issue
8500|https://github.com/mozilla/pdf.js/issues/8500], it renders in 66 seconds
instead of 100. When rendering all my test files on my fast PC, overall time
(excluding the mentioned file) gets lowered by 10 seconds, so we save up to 160
seconds somewhere.
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