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| author | Bo Xu <bo_xu@foxitsoftware.com> | 2014-12-17 17:51:00 -0800 |
|---|---|---|
| committer | Bo Xu <bo_xu@foxitsoftware.com> | 2014-12-17 17:51:00 -0800 |
| commit | bf42dfea544a8ea3269b139e940f3f8eb38f7a27 (patch) | |
| tree | 2eedf59a9519706f4d1db486b2ee9571770444ae /core/src/fxcodec/jbig2/JBig2_SymbolDict.cpp | |
| parent | 9f52a10839e62a8b58359d89e6f623cdcb77c71b (diff) | |
| download | pdfium-bf42dfea544a8ea3269b139e940f3f8eb38f7a27.tar.xz | |
Add a small LRU cache for the JBIG2 symbol dictionary.
This reduces rendering time on my test document by over
10 seconds. It is super common for a JBIG2 dictionary to
span multiple pages, so we don't want to decode the same
dictionary over and over again.
Original patch from Jeff Breidenbach (breidenbach@gmail.com)
BUG=https://code.google.com/p/pdfium/issues/detail?id=85
R=bo_xu@foxitsoftware.com, thestig@chromium.org
Review URL: https://codereview.chromium.org/761313004
Diffstat (limited to 'core/src/fxcodec/jbig2/JBig2_SymbolDict.cpp')
| -rw-r--r-- | core/src/fxcodec/jbig2/JBig2_SymbolDict.cpp | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/core/src/fxcodec/jbig2/JBig2_SymbolDict.cpp b/core/src/fxcodec/jbig2/JBig2_SymbolDict.cpp index 67e54c0cea..bad2fc4bce 100644 --- a/core/src/fxcodec/jbig2/JBig2_SymbolDict.cpp +++ b/core/src/fxcodec/jbig2/JBig2_SymbolDict.cpp @@ -13,6 +13,26 @@ CJBig2_SymbolDict::CJBig2_SymbolDict() m_gbContext = m_grContext = NULL; } +CJBig2_SymbolDict *CJBig2_SymbolDict::DeepCopy() +{ + CJBig2_SymbolDict *dst = NULL; + CJBig2_SymbolDict *src = this; + if (src->m_bContextRetained || + src->m_gbContext || + src->m_grContext) { + return NULL; + } + JBIG2_ALLOC(dst, CJBig2_SymbolDict()); + dst->SDNUMEXSYMS = src->SDNUMEXSYMS; + dst->SDEXSYMS = (CJBig2_Image**)m_pModule->JBig2_Malloc2( + sizeof(CJBig2_Image*), src->SDNUMEXSYMS); + for(FX_DWORD i = 0; i < src->SDNUMEXSYMS; i++) { + JBIG2_ALLOC(dst->SDEXSYMS[i], + CJBig2_Image(*(src->SDEXSYMS[i]))); + } + return dst; +} + CJBig2_SymbolDict::~CJBig2_SymbolDict() { if(SDEXSYMS) { |