From 56ee1b311559b239511c5549121fe34cb6368459 Mon Sep 17 00:00:00 2001 From: Bo Xu Date: Wed, 17 Dec 2014 17:51:00 -0800 Subject: XFA: merge patch from CL 761313004 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 --- core/src/fxcodec/jbig2/JBig2_SymbolDict.cpp | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'core/src/fxcodec/jbig2/JBig2_SymbolDict.cpp') 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) { -- cgit v1.2.3