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https://issues.apache.org/jira/browse/PDFBOX-3432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15390669#comment-15390669
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Tilman Hausherr commented on PDFBOX-3432:
-----------------------------------------
I tested the code and it works fine. But this code looks weird - why is this so?
{code}
private void buildGlyphIdToCharacterCodeLookup(IIntIntMap tmpGlyphToChar,
int maxGlyphId)
{
glyphIdToCharacterCode = newGlyphIdToCharacterCode(maxGlyphId + 1);
if (tmpGlyphToChar instanceof IntIntMap)
{
EntryIterator iter = ((IntIntMap) tmpGlyphToChar).entryIterator();
while (iter.hasNext())
{
iter.next();
glyphIdToCharacterCode[iter.currentKey()] = iter.currentValue();
}
}
else {
Iterator<IntIntPair> iter =
((IntIntHashMap)tmpGlyphToChar).keyValuesIterator();
while (iter.hasNext()) {
IntIntPair pair = iter.next();
glyphIdToCharacterCode[pair.getOne()] = pair.getTwo();
}
}
// for (Entry<Integer, Integer> entry : tmpGlyphToChar.entrySet())
// {
// // link the glyphId with the right character code
// glyphIdToCharacterCode[entry.getKey()] = entry.getValue();
// }
}
{code}
> Optimize CID to GlyphId mapping (TTF)
> -------------------------------------
>
> Key: PDFBOX-3432
> URL: https://issues.apache.org/jira/browse/PDFBOX-3432
> Project: PDFBox
> Issue Type: Improvement
> Components: FontBox
> Affects Versions: 2.0.1, 2.0.2, 2.0.3
> Environment: Ubuntu 14.04.4 LTS
> Reporter: Michael Doswald
> Priority: Trivial
> Labels: optimization, performance
> Fix For: 2.0.3, 2.1.0
>
> Attachments: PDFBOX-3432_Optimize_CID_to_GlyphId_mapping_rev1.patch,
> fontbox-benchmark-CustomMap-VS-GSCollections.zip,
> patch_for_CustomMap_VS_GSCollections_benchmark.patch,
> pdfbox-performance-PDFBOX-3432.zip
>
>
> TTF fonts map code-points (Code IDs) to glyphs. These are mappings from int
> to int. Because the JDK lacks map classes for primitive types, the code (e.g.
> in CmapSubtable) currently uses Map<Integer,Integer> for those mappings. This
> is inefficient in different ways:
> * Autoboxing/unboxing introduces a performance penalty
> * Boxing to Integer objects has a memory overhead
> * The JDK Map implementation has a big memory overhead for such simple objects
> For efficiency (execution time and memory consumption) I would propose to
> introduce a simple IntIntMap implementation which works with primitive
> integers.
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