summaryrefslogtreecommitdiff
path: root/xfa/fde/css/fde_csscache.cpp
blob: c68d4ddb49169670835628a9fa2cba414b438f06 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "xfa/fde/css/fde_csscache.h"

#include <algorithm>

#include "core/fxcrt/include/fx_ext.h"

FDE_CSSCacheItem::FDE_CSSCacheItem(IFDE_CSSStyleSheet* p)
    : pStylesheet(p), dwActivity(0) {
  FXSYS_assert(pStylesheet);
  pStylesheet->AddRef();
}
FDE_CSSCacheItem::~FDE_CSSCacheItem() {
  pStylesheet->Release();
}
IFDE_CSSStyleSheetCache* IFDE_CSSStyleSheetCache::Create() {
  return new CFDE_CSSStyleSheetCache;
}

CFDE_CSSStyleSheetCache::CFDE_CSSStyleSheetCache()
    : m_pFixedStore(NULL), m_iMaxItems(5) {}

CFDE_CSSStyleSheetCache::~CFDE_CSSStyleSheetCache() {
  for (const auto& pair : m_Stylesheets) {
    FXTARGET_DeleteWith(FDE_CSSCacheItem, m_pFixedStore, pair.second);
  }
  m_Stylesheets.clear();
  if (m_pFixedStore) {
    m_pFixedStore->Release();
  }
}
void CFDE_CSSStyleSheetCache::AddStyleSheet(const CFX_ByteStringC& szKey,
                                            IFDE_CSSStyleSheet* pStyleSheet) {
  FXSYS_assert(pStyleSheet != NULL);
  if (m_pFixedStore == NULL) {
    m_pFixedStore =
        FX_CreateAllocator(FX_ALLOCTYPE_Fixed, std::max(10, m_iMaxItems),
                           sizeof(FDE_CSSCacheItem));
    FXSYS_assert(m_pFixedStore != NULL);
  }
  auto it = m_Stylesheets.find(szKey);
  if (it != m_Stylesheets.end()) {
    FDE_CSSCacheItem* pItem = it->second;
    if (pItem->pStylesheet != pStyleSheet) {
      pItem->pStylesheet->Release();
      pItem->pStylesheet = pStyleSheet;
      pItem->pStylesheet->AddRef();
      pItem->dwActivity = 0;
    }
  } else {
    while (static_cast<int32_t>(m_Stylesheets.size()) >= m_iMaxItems) {
      RemoveLowestActivityItem();
    }
    m_Stylesheets[szKey] =
        FXTARGET_NewWith(m_pFixedStore) FDE_CSSCacheItem(pStyleSheet);
  }
}
IFDE_CSSStyleSheet* CFDE_CSSStyleSheetCache::GetStyleSheet(
    const CFX_ByteStringC& szKey) const {
  auto it = m_Stylesheets.find(szKey);
  if (it == m_Stylesheets.end()) {
    return nullptr;
  }
  FDE_CSSCacheItem* pItem = it->second;
  pItem->dwActivity++;
  pItem->pStylesheet->AddRef();
  return pItem->pStylesheet;
}
void CFDE_CSSStyleSheetCache::RemoveStyleSheet(const CFX_ByteStringC& szKey) {
  auto it = m_Stylesheets.find(szKey);
  if (it == m_Stylesheets.end()) {
    return;
  }
  FXTARGET_DeleteWith(FDE_CSSCacheItem, m_pFixedStore, it->second);
  m_Stylesheets.erase(it);
}
void CFDE_CSSStyleSheetCache::RemoveLowestActivityItem() {
  auto found = m_Stylesheets.end();
  for (auto it = m_Stylesheets.begin(); it != m_Stylesheets.end(); ++it) {
    switch (it->first.GetID()) {
      case FXBSTR_ID('#', 'U', 'S', 'E'):
      case FXBSTR_ID('#', 'A', 'G', 'E'):
        continue;
    }
    if (found == m_Stylesheets.end() ||
        it->second->dwActivity > found->second->dwActivity) {
      found = it;
    }
  }
  if (found != m_Stylesheets.end()) {
    FXTARGET_DeleteWith(FDE_CSSCacheItem, m_pFixedStore, found->second);
    m_Stylesheets.erase(found);
  }
}
FDE_CSSTagCache::FDE_CSSTagCache(FDE_CSSTagCache* parent,
                                 IFDE_CSSTagProvider* tag)
    : pTag(tag),
      pParent(parent),
      dwIDHash(0),
      dwTagHash(0),
      iClassIndex(0),
      dwClassHashs(1) {
  FXSYS_assert(pTag != NULL);
  CFX_WideStringC wsValue, wsName = pTag->GetTagName();
  dwTagHash = FX_HashCode_String_GetW(wsName.c_str(), wsName.GetLength(), TRUE);
  FX_POSITION pos = pTag->GetFirstAttribute();
  while (pos != NULL) {
    pTag->GetNextAttribute(pos, wsName, wsValue);
    uint32_t dwNameHash =
        FX_HashCode_String_GetW(wsName.c_str(), wsName.GetLength(), TRUE);
    static const uint32_t s_dwIDHash = FX_HashCode_String_GetW(L"id", 2, TRUE);
    static const uint32_t s_dwClassHash =
        FX_HashCode_String_GetW(L"class", 5, TRUE);
    if (dwNameHash == s_dwClassHash) {
      uint32_t dwHash =
          FX_HashCode_String_GetW(wsValue.c_str(), wsValue.GetLength());
      dwClassHashs.Add(dwHash);
    } else if (dwNameHash == s_dwIDHash) {
      dwIDHash = FX_HashCode_String_GetW(wsValue.c_str(), wsValue.GetLength());
    }
  }
}
FDE_CSSTagCache::FDE_CSSTagCache(const FDE_CSSTagCache& it)
    : pTag(it.pTag),
      pParent(it.pParent),
      dwIDHash(it.dwIDHash),
      dwTagHash(it.dwTagHash),
      iClassIndex(0),
      dwClassHashs(1) {
  if (it.dwClassHashs.GetSize() > 0) {
    dwClassHashs.Copy(it.dwClassHashs);
  }
}
void CFDE_CSSAccelerator::OnEnterTag(IFDE_CSSTagProvider* pTag) {
  FDE_CSSTagCache* pTop = GetTopElement();
  FDE_CSSTagCache item(pTop, pTag);
  m_Stack.Push(item);
}
void CFDE_CSSAccelerator::OnLeaveTag(IFDE_CSSTagProvider* pTag) {
  FXSYS_assert(m_Stack.GetTopElement());
  FXSYS_assert(m_Stack.GetTopElement()->GetTag() == pTag);
  m_Stack.Pop();
}