annotate OrthancStone/Sources/Loaders/BasicFetchingStrategy.cpp @ 1948:d459477804bf

added SetFrame() in Stone Web viewer
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 15 Jul 2022 16:17:23 +0200
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
1871
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5 * Copyright (C) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "BasicFetchingStrategy.h"
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25
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26 #include <OrthancException.h>
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27
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28 #include <cassert>
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29
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30 namespace OrthancStone
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31 {
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32 void BasicFetchingStrategy::Schedule(unsigned int item,
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33 unsigned int quality)
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34 {
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35 assert(item < GetItemsCount() &&
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36 quality <= maxQuality_);
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37
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38 if (nextQuality_[item] <= quality)
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39 {
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40 content_.push_back(ContentItem(item, quality));
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41 }
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42 }
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44
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45 BasicFetchingStrategy::BasicFetchingStrategy(IFetchingItemsSorter* sorter, // Takes ownership
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46 unsigned int maxQuality,
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47 unsigned int initialItem) :
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48 sorter_(sorter),
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49 maxQuality_(maxQuality),
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50 position_(0),
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51 blockSize_(2)
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52 {
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53 if (sorter == NULL)
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54 {
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55 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
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56 }
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57
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58 nextQuality_.resize(sorter_->GetItemsCount(), 0); // Does not change along calls to "SetCurrent()"
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59
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60 SetCurrent(initialItem);
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61 }
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62
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63
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64 void BasicFetchingStrategy::SetBlockSize(unsigned int size)
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65 {
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66 if (size == 0)
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67 {
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68 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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69 }
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70
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71 blockSize_ = size;
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72 }
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73
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74
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75 bool BasicFetchingStrategy::GetNext(unsigned int& item,
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76 unsigned int& quality)
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77 {
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78 if (position_ >= content_.size())
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79 {
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80 return false;
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81 }
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82 else
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83 {
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84 item = content_[position_].GetItem();
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85 quality = content_[position_].GetQuality();
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86
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87 assert(nextQuality_[item] <= quality);
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88 nextQuality_[item] = quality + 1;
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89
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90 position_ ++;
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91 return true;
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92 }
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93 }
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94
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95
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96 void BasicFetchingStrategy::SetCurrent(unsigned int item)
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97 {
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98 // TODO - This function is O(N) complexity where "N" is the
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99 // number of items times the max quality. Could use a LRU index.
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100
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101 position_ = 0;
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102
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103 std::vector<unsigned int> v;
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104 sorter_->Sort(v, item);
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105
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106 assert(v.size() == GetItemsCount());
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107
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108 if (v.size() == 0)
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109 {
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110 return;
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111 }
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112
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113 content_.clear();
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114 content_.reserve(v.size() * maxQuality_);
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115
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116 Schedule(v.front(), maxQuality_);
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117
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118 for (unsigned int q = 0; q <= maxQuality_; q++)
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119 {
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120 unsigned int start = 1 + q * blockSize_;
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121 unsigned int end = start + blockSize_;
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122
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123 if (q == maxQuality_ ||
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124 end > v.size())
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125 {
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126 end = static_cast<int>(v.size());
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127 }
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128
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129 unsigned int a = 0;
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130 if (maxQuality_ >= q + 1)
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131 {
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132 a = maxQuality_ - q - 1;
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133 }
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134
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135 for (unsigned int j = a; j <= maxQuality_; j++)
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136 {
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137 for (unsigned int i = start; i < end; i++)
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138 {
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139 Schedule(v[i], j);
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140 }
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141 }
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142 }
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143 }
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144
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145
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146 void BasicFetchingStrategy::RecycleFurthest(unsigned int& item)
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147 {
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148 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented);
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149 }
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150 }