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1 // Copyright (c) 1996-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 // Window server redraw queue handling |
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17 // |
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18 #include <e32std.h> |
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19 #include "server.h" |
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20 #include "rootwin.h" |
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21 #include "windowgroup.h" |
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22 #include "walkwindowtree.h" |
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23 #include "EVQUEUE.H" |
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24 #include "panics.h" |
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25 #include "wstop.h" |
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26 |
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27 const TInt KGranularity = 10; |
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28 |
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29 void TWsRedrawEvent::SetHandle(TUint aHandle) |
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30 { |
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31 iHandle=aHandle; |
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32 } |
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33 |
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34 void TWsRedrawEvent::SetRect(TRect aRect) |
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35 { |
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36 iRect=aRect; |
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37 } |
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38 |
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39 TWsRedrawEvent CRedrawQueue::iNullRedrawEvent; |
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40 |
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41 CRedrawQueue::CRedrawQueue(CWsClient *aOwner) : CEventBase(aOwner) |
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42 { |
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43 __DECLARE_NAME(_S("CRedrawQueue")); |
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44 } |
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45 |
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46 void CRedrawQueue::ConstructL() |
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47 { |
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48 iRedrawTrigger=EFalse; |
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49 iRedraws=new(ELeave) CArrayFixSeg<TRedraw>(KGranularity); |
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50 iKeyPriority=new(ELeave) TKeyArrayFix(_FOFF(TRedraw,iPriority),ECmpTUint32); |
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51 iKeyWindow=new(ELeave) TKeyArrayFix(_FOFF(TRedraw,iRedraw),ECmpTUint32); |
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52 Mem::FillZ(&iNullRedrawEvent,sizeof(iNullRedrawEvent)); |
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53 } |
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54 |
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55 CRedrawQueue::~CRedrawQueue() |
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56 { |
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57 delete iRedraws; |
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58 delete iKeyPriority; |
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59 delete iKeyWindow; |
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60 } |
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61 |
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62 void CRedrawQueue::ReCalcOrder() |
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63 { |
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64 const TInt redrawsCount=iRedraws->Count(); |
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65 for(TInt index=0;index<redrawsCount;index++) |
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66 { |
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67 TRedraw *redraw=&iRedraws->At(index); |
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68 redraw->iPriority=static_cast<CWsClientWindow*>(redraw->iRedraw->WsWin())->RedrawPriority(); |
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69 } |
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70 iRedraws->Sort(*iKeyPriority); |
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71 } |
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72 |
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73 void CRedrawQueue::AddInvalid(CWsWindowRedraw *aRedrawWin) |
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74 // |
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75 // Add a window to the update list. |
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76 // |
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77 { |
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78 TInt index; |
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79 TRedraw redraw; |
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80 |
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81 redraw.iRedraw=aRedrawWin; |
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82 if (iRedraws->Find(redraw,*iKeyWindow,index)!=0) |
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83 { |
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84 redraw.iPriority=static_cast<CWsClientWindow*>(aRedrawWin->WsWin())->RedrawPriority(); |
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85 TRAPD(err,iRedraws->InsertIsqAllowDuplicatesL(redraw,*iKeyPriority)); |
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86 if (err!=KErrNone) |
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87 { |
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88 WS_ASSERT_DEBUG(err==KErrNoMemory,EWsPanicRedrawQueueError); |
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89 iAllocError=ETrue; |
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90 } |
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91 iRedrawTrigger=ETrue; |
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92 } |
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93 } |
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94 |
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95 void CRedrawQueue::DeleteFromQueue(TInt aIndex) |
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96 { |
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97 iRedraws->Delete(aIndex,1); |
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98 |
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99 //We are certain we will need iRedraws again, so it would be silly to compress away the last KGranularity slots. |
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100 const TInt count = iRedraws->Count(); |
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101 if((count >= KGranularity) && (count % KGranularity == 0)) |
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102 { |
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103 iRedraws->Compress(); |
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104 } |
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105 } |
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106 |
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107 void CRedrawQueue::RemoveInvalid(CWsWindowRedraw *aRedrawWin) |
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108 // |
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109 // remove the window from the invalid window list. |
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110 // harmless to call if the window is not in the list. |
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111 // |
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112 { |
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113 TInt index; |
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114 TRedraw redraw; |
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115 |
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116 redraw.iRedraw=aRedrawWin; |
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117 redraw.iPriority=0; |
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118 if ((iRedraws->Find(redraw,*iKeyWindow,index))==KErrNone) |
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119 DeleteFromQueue(index); |
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120 } |
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121 |
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122 TBool CRedrawQueue::TriggerRedraw() |
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123 // |
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124 // Trigger any pending redraw messages in the queue |
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125 // Returns ETrue if a redraw was sent, EFalse if not. |
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126 // |
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127 { |
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128 TBool ret=EFalse; |
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129 if (iRedrawTrigger) |
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130 { |
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131 iRedrawTrigger=EFalse; |
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132 if (!iEventMsg.IsNull() && (iRedraws->Count()>0 || iAllocError)) |
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133 { |
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134 SignalEvent(); |
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135 ret=ETrue; |
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136 } |
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137 } |
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138 return(ret); |
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139 } |
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140 |
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141 void CRedrawQueue::EventReady(const RMessagePtr2& aEventMsg) |
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142 // |
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143 // Queue a read of an event from the queue |
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144 // |
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145 { |
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146 CEventBase::EventReady(aEventMsg); |
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147 iRedrawTrigger=ETrue; |
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148 TriggerRedraw(); |
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149 } |
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150 |
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151 TBool CRedrawQueue::FindOutstandingRedrawEvent(CWsWindowRedraw& aRedraw, TWsRedrawEvent& aEvent) |
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152 { |
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153 TRect rect; |
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154 if (aRedraw.GetRedrawRect(rect)) |
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155 { |
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156 aEvent.SetRect(rect); |
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157 aEvent.SetHandle(aRedraw.WsWin()->ClientHandle()); |
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158 CEventBase::GetData(&aEvent,sizeof(aEvent)); |
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159 return ETrue; |
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160 } |
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161 return EFalse; |
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162 } |
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163 |
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164 TBool CRedrawQueue::FindWindowNeedingRedrawEvent(TWsRedrawEvent& aEvent) |
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165 { |
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166 #if defined(_DEBUG) |
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167 CWsWindowRedraw* previousRedraw = NULL; |
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168 #endif |
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169 // search all screens |
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170 TInt invalidWindows = 0; |
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171 for (TInt screenNo = 0; screenNo < CWsTop::NumberOfScreens(); ++screenNo) |
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172 { |
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173 CWsRootWindow* rootWindow = CWsTop::Screen(screenNo)->RootWindow(); |
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174 for (CWsWindowGroup *groupWin = rootWindow->Child(); groupWin; groupWin = groupWin->NextSibling()) |
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175 { |
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176 if (groupWin->WsOwner() == iWsOwner) |
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177 { |
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178 CWsWindowRedraw* redrawWin = NULL; |
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179 // use a window tree walk that can be resumed to find windows with an invalid region |
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180 TResumableWalkWindowTreeFindInvalid wwt(&redrawWin); |
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181 groupWin->WalkWindowTree(wwt, EWalkChildren, EFalse); |
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182 while (redrawWin != NULL) |
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183 { |
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184 WS_ASSERT_DEBUG(redrawWin != previousRedraw, EWsPanicRedrawQueueError); |
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185 // (the window may not actually need the client to redraw it, e.g. a CWsBlankWindow can redraw itself) |
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186 if (FindOutstandingRedrawEvent(*redrawWin, aEvent)) |
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187 { |
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188 return ETrue; |
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189 } |
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190 else |
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191 { // continue the Tree Walk |
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192 #if defined(_DEBUG) |
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193 previousRedraw = redrawWin; |
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194 #endif |
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195 if (redrawWin->NeedsRedraw()) |
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196 { // needs to be redrawn later? |
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197 ++invalidWindows; |
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198 } |
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199 redrawWin = NULL; |
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200 groupWin->WalkWindowTree(wwt, EWalkChildren, ETrue); |
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201 } |
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202 } |
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203 } |
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204 } |
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205 } |
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206 |
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207 if (invalidWindows == 0) |
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208 { // error recovery is complete |
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209 iAllocError = 0; |
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210 } |
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211 return EFalse; |
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212 } |
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213 |
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214 void CRedrawQueue::GetData() |
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215 // |
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216 // If there is an outstanding redraw event in the queue, reply with it's data |
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217 // |
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218 { |
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219 CWsWindowRedraw *redraw; |
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220 TWsRedrawEvent event; |
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221 |
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222 while (iRedraws->Count()>0) |
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223 { |
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224 redraw=(*iRedraws)[0].iRedraw; |
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225 if (FindOutstandingRedrawEvent(*redraw,event)) |
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226 { |
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227 return; |
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228 } |
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229 TInt toDelete=0; |
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230 if (redraw!=(*iRedraws)[0].iRedraw) |
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231 { //In low memory conditions calls to FindOutstandingRedrawEvent can cause extra entries to be added to the array |
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232 TRedraw redrawFind; |
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233 redrawFind.iRedraw=redraw; |
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234 iRedraws->Find(redrawFind,*iKeyWindow,toDelete); |
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235 } |
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236 DeleteFromQueue(toDelete); |
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237 } |
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238 |
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239 if (iAllocError && FindWindowNeedingRedrawEvent(event)) |
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240 { |
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241 return; |
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242 } |
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243 |
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244 CEventBase::GetData(&iNullRedrawEvent,sizeof(iNullRedrawEvent)); |
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245 } |
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246 |
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247 TUint CRedrawQueue::RedrawPriority(CWsWindowRedraw *aRedrawWin) |
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248 { |
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249 TInt index; |
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250 TRedraw redraw; |
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251 TUint priority=0; |
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252 redraw.iRedraw=aRedrawWin; |
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253 |
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254 if ((iRedraws->Find(redraw,*iKeyWindow,index))==KErrNone) |
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255 { |
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256 priority=iRedraws->At(index).iPriority; |
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257 } |
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258 return priority; |
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259 } |