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1 // Copyright (c) 1998-2009 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 #include <gdi.h> |
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17 #include "GDIPANIC.h" |
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18 |
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19 // |
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20 // CPalette |
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21 // |
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22 |
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23 _LIT(KGdiCPalettePanicCategory,"CPalette"); |
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24 |
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25 EXPORT_C CPalette::CPalette(): |
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26 CBase(), |
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27 iArray(NULL), |
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28 iNumEntries(0) |
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29 {} |
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30 |
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31 |
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32 EXPORT_C CPalette::~CPalette() |
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33 /** Destructor. */ |
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34 { |
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35 delete [] iArray; |
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36 } |
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37 |
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38 |
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39 EXPORT_C void CPalette::Clear() |
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40 /** Clears all the entries in the palette to TRgb(0). */ |
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41 { |
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42 TRgb blank(0); |
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43 for(TInt count=0;count<iNumEntries;count++) |
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44 iArray[count]=blank; |
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45 } |
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46 |
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47 |
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48 EXPORT_C CPalette* CPalette::NewL(TInt aNumberOfEntries) |
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49 /** Creates a new palette with the specified number of entries. |
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50 |
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51 @param aNumberOfEntries The number of entries in the palette being created. |
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52 @return The newly created palette. */ |
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53 { |
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54 CPalette* thisptr=new(ELeave) CPalette; |
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55 CleanupStack::PushL(thisptr); |
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56 thisptr->ConstructL(aNumberOfEntries); |
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57 CleanupStack::Pop(); |
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58 return(thisptr); |
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59 } |
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60 |
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61 |
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62 EXPORT_C CPalette* CPalette::NewDefaultL(TDisplayMode aDispMode) |
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63 /** Creates a new default palette for the specified display mode. The default palette |
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64 for a particular display mode has one entry for each possible colour in that |
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65 display mode (2 entries for EGray2, 16 entries for EColor16 etc.); the colour |
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66 of each index p in the default palette is set to its default value according |
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67 to its display mode (e.g. if the mode is EColor16 then palette[p]==TRgb::Color16(p); |
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68 if the mode is EGray4 then palette[p]==TRgb::_Gray4(p)). |
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69 |
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70 @param aDispMode The display mode for which the palette is to be created. |
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71 @return The newly created palette */ |
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72 { |
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73 TInt numentries=0; |
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74 switch(aDispMode) |
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75 { |
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76 case EGray2: |
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77 numentries=2; |
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78 break; |
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79 case EGray4: |
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80 numentries=4; |
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81 break; |
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82 case EGray16: |
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83 case EColor16: |
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84 numentries=16; |
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85 break; |
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86 case EGray256: |
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87 case EColor256: |
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88 numentries=256; |
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89 break; |
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90 default: |
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91 User::Leave(KErrNotSupported); |
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92 }; |
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93 CPalette* thisptr=new(ELeave) CPalette; |
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94 CleanupStack::PushL(thisptr); |
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95 thisptr->ConstructL(numentries); |
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96 TInt count=0; |
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97 switch(aDispMode) |
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98 { |
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99 case EGray2: |
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100 thisptr->iArray[0]=TRgb::_Gray2(0); |
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101 thisptr->iArray[1]=TRgb::_Gray2(1); |
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102 break; |
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103 case EGray4: |
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104 for(;count<numentries;count++) |
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105 thisptr->iArray[count]=TRgb::_Gray4(count); |
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106 break; |
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107 case EGray16: |
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108 for(;count<numentries;count++) |
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109 thisptr->iArray[count]=TRgb::_Gray16(count); |
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110 break; |
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111 case EColor16: |
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112 for(;count<numentries;count++) |
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113 thisptr->iArray[count]=TRgb::Color16(count); |
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114 break; |
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115 case EGray256: |
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116 for(;count<numentries;count++) |
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117 thisptr->iArray[count]=TRgb::_Gray256(count); |
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118 break; |
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119 case EColor256: |
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120 for(;count<numentries;count++) |
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121 thisptr->iArray[count]=TRgb::Color256(count); |
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122 break; |
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123 default: |
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124 User::Leave(KErrNotSupported); |
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125 } |
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126 CleanupStack::Pop(); |
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127 return(thisptr); |
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128 } |
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129 |
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130 void CPalette::ConstructL(TInt aNumberOfEntries) |
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131 { |
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132 if(aNumberOfEntries<=0) User::Leave(KErrArgument); |
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133 iArray=new(ELeave) TRgb[aNumberOfEntries]; |
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134 iNumEntries=aNumberOfEntries; |
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135 } |
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136 |
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137 |
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138 EXPORT_C TRgb CPalette::GetEntry(TInt aIndex) const |
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139 /** Gets the RGB value of the palette entry at aPaletteIndex. |
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140 |
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141 @param aPaletteIndex The index of the palette entry to get. |
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142 @return The RGB value of the palette entry */ |
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143 { |
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144 GDI_ASSERT_ALWAYS_GENERAL(aIndex<iNumEntries,User::Panic(KGdiCPalettePanicCategory,KErrTooBig)); |
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145 if(aIndex<iNumEntries) |
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146 return(iArray[aIndex]); |
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147 TRgb defaultcol(0,0,0); |
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148 return(defaultcol); |
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149 } |
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150 |
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151 |
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152 EXPORT_C TRgb CPalette::NearestEntry(const TRgb& aColor) const |
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153 /** Gets the colour in the palette which is closest to the specified colour. |
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154 |
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155 @param aColor The colour to find. |
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156 @return The colour in the palette which is closest to the specified colour. */ |
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157 { |
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158 return(iArray[NearestIndex(aColor)]); |
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159 } |
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160 |
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161 |
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162 EXPORT_C TInt CPalette::NearestIndex(const TRgb& aColor) const |
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163 /** Gets the index of the colour in the palette which is closest to the specified |
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164 colour. |
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165 |
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166 @param aColor The colour to find. |
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167 @return The index of the colour in the palette which is closest to the specified |
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168 colour. */ |
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169 { |
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170 TRgb* entry = iArray; |
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171 TRgb* entryLimit = entry+iNumEntries; |
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172 TRgb* lowest = entry; |
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173 TInt mindif = KMaxTInt; |
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174 |
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175 while(entry<entryLimit) |
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176 { |
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177 TInt value = entry->Internal(); |
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178 |
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179 TInt difference = Abs((TInt)(aColor.Internal()&0xFF)-(TInt)(value&0xFF))+ |
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180 (Abs((TInt)(aColor.Internal()&0xFF00)-(TInt)(value&0xFF00))>>8)+ |
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181 (Abs((TInt)(aColor.Internal()&0xFF0000)-(TInt)(value&0xFF0000))>>16); |
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182 |
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183 if(difference<mindif) |
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184 { |
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185 lowest=entry; |
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186 mindif=difference; |
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187 if(difference==0) |
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188 break; |
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189 } |
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190 entry++; |
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191 } |
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192 return(lowest-iArray); |
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193 } |
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194 |
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195 |
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196 EXPORT_C void CPalette::SetEntry(TInt aIndex,const TRgb& aColor) |
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197 /** Sets the palette entry at aPaletteIndex to the RGB value aPaletteEntry. |
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198 |
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199 @param aPaletteIndex The index of the palette entry to be set. |
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200 @param aPaletteEntry The RGB value to set that entry to. */ |
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201 { |
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202 GDI_ASSERT_ALWAYS_GENERAL(aIndex<iNumEntries,User::Panic(KGdiCPalettePanicCategory,KErrTooBig)); |
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203 iArray[aIndex]=aColor; |
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204 } |
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205 |
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206 |
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207 EXPORT_C void CPalette::GetDataPtr(TInt aFirstColor,TInt aNumColors,TPtr8& aPtr) |
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208 /** Returns a descriptor over the palette entries for the specifed colors. It is |
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209 designed so that the descriptor can be passed to another thread and that thread |
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210 copy the relevant entries. |
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211 |
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212 @param aFirstColor The first colour. |
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213 @param aNumColors Number of colours. |
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214 @param aPtr Descriptor. */ |
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215 { |
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216 TInt size=sizeof(TRgb)*aNumColors; |
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217 aPtr.Set(REINTERPRET_CAST(TUint8*,&iArray[aFirstColor]),size,size); |
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218 } |