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1 /* |
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2 * Copyright (c) 2006-2007 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: Wrapper for converter used for drawing to Canvas or Image. |
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15 * |
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16 */ |
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17 |
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18 |
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19 // INCLUDE FILES |
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20 #include "CMIDNativeConverter.h" |
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21 #include "CMIDConvertFactory.h" |
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22 |
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23 const TInt KAlphaShift = 8; |
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24 |
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25 CMIDNativeConverter::CMIDNativeConverter() |
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26 { |
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27 iDefaultConverter = TMID8888Format(); |
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28 iAlphaMode = ENone; |
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29 } |
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30 |
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31 CMIDNativeConverter::~CMIDNativeConverter() |
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32 { |
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33 delete iNativeFormat; |
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34 } |
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35 |
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36 CMIDNativeConverter* CMIDNativeConverter::NewL(const TMIDBitmapParameters& aParameters) |
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37 { |
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38 CMIDNativeConverter* self = new(ELeave)CMIDNativeConverter; |
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39 CleanupStack::PushL(self); |
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40 self->ConstructL(aParameters); |
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41 CleanupStack::Pop(self); |
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42 return self; |
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43 } |
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44 |
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45 void CMIDNativeConverter::ConstructL(const TMIDBitmapParameters& aParameters) |
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46 { |
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47 iAlphaBitmap = aParameters.iAlpha; |
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48 iAlphaMode = aParameters.iAlphaMode; |
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49 iScanlength = aParameters.iScanLength; |
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50 |
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51 iNativeFormat = CMIDConvertFactory::NewConverterL(aParameters.iFormat); |
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52 iNativeFormat->InitializeL(aParameters); |
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53 } |
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54 |
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55 void CMIDNativeConverter::Convert(TMIDInternalARGB& aResult, TUint32 aColor) const |
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56 { |
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57 iDefaultConverter.Convert(aResult, aColor); |
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58 } |
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59 |
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60 void CMIDNativeConverter::GetPixel(TMIDInternalARGB& aResult) const |
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61 { |
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62 if (iNativeFormat->IsAlpha()) |
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63 { |
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64 iNativeFormat->GetPixelWithAlpha(aResult); |
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65 } |
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66 iNativeFormat->GetPixel(aResult); |
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67 } |
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68 |
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69 void CMIDNativeConverter::PlotPixel(const TMIDInternalARGB& aInternal) |
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70 { |
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71 iNativeFormat->PlotPixel(aInternal); |
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72 } |
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73 |
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74 void CMIDNativeConverter::PlotPixelWithAlpha(const TMIDInternalARGB& aInternal) |
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75 { |
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76 if (aInternal.iA == KAlphaFullTransparent) |
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77 { |
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78 // totally transparent, no need to do anything |
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79 return; |
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80 } |
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81 |
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82 if (aInternal.iA == KAlphaFullOpaque) |
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83 { |
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84 iNativeFormat->PlotPixel(aInternal); |
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85 } |
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86 else |
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87 { |
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88 // calculating partial transparency |
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89 TMIDInternalARGB alphaPixel = aInternal; |
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90 TMIDInternalARGB belowPixel; |
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91 iNativeFormat->GetPixel(belowPixel); |
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92 CalculateAlpha(alphaPixel, belowPixel); |
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93 iNativeFormat->PlotPixel(alphaPixel); |
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94 } |
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95 } |
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96 |
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97 void CMIDNativeConverter::PlotPixelWithAlphaBitmap(const TMIDInternalARGB& aInternal) |
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98 { |
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99 if (aInternal.iA == KAlphaFullTransparent) |
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100 { |
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101 // totally transparent, no need to do anything |
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102 return; |
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103 } |
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104 if (aInternal.iA == KAlphaFullOpaque) |
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105 { |
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106 iNativeFormat->PlotPixelWithAlpha(aInternal); |
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107 } |
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108 else |
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109 { |
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110 // calculating partial transparency |
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111 TMIDInternalARGB alphaPixel = aInternal; |
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112 TMIDInternalARGB belowPixel; |
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113 iNativeFormat->GetPixel(belowPixel); |
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114 CalculateAlpha(alphaPixel, belowPixel); |
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115 iNativeFormat->PlotPixelWithAlpha(alphaPixel); |
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116 } |
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117 } |
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118 |
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119 void CMIDNativeConverter::SetBitmaps(TUint32* aBitmap) |
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120 { |
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121 iNativeFormat->SetBitmap(aBitmap); |
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122 } |
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123 |
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124 void CMIDNativeConverter::SetDrawRect(TRect aDrawRect) |
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125 { |
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126 iDrawRect = aDrawRect; |
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127 iPosition = aDrawRect.iTl; |
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128 iNativeFormat->iOffset = iDrawRect.iTl.iX + iDrawRect.iTl.iY * iScanlength; |
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129 } |
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130 |
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131 void CMIDNativeConverter::PlotPixel(const TPoint& aPos, |
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132 const TMIDInternalARGB& aInternal, const TRect& aClip) |
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133 { |
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134 // is in clip rect |
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135 if (aClip.Contains(aPos)) |
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136 { |
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137 iNativeFormat->iOffset = aPos.iX + aPos.iY * iScanlength; |
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138 PlotPixelWithAlphaBitmap(aInternal); |
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139 } |
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140 } |
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141 |
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142 void CMIDNativeConverter::DrawScanLine(TPoint aPos, TInt aLength, |
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143 const TMIDInternalARGB& aInternal, const TRect& aClip) |
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144 { |
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145 |
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146 if ((aPos.iY < aClip.iTl.iY) || |
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147 (aPos.iY >= aClip.iBr.iY)|| |
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148 (aPos.iX > aClip.iBr.iX)) |
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149 { |
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150 return; |
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151 } |
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152 if (aPos.iX > aClip.iBr.iX) |
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153 { |
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154 return; |
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155 } |
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156 if (aPos.iX < aClip.iTl.iX) |
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157 { |
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158 aLength -= aClip.iTl.iX - aPos.iX; |
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159 aPos.iX = aClip.iTl.iX; |
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160 } |
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161 if (aPos.iX + aLength > aClip.iBr.iX) |
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162 { |
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163 aLength = aClip.iBr.iX - aPos.iX; |
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164 } |
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165 |
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166 iNativeFormat->iOffset = aPos.iX + aPos.iY * iScanlength; |
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167 for (TInt i = 0; i < aLength; i++) |
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168 { |
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169 PlotPixelWithAlphaBitmap(aInternal); |
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170 ++(iNativeFormat->iOffset); |
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171 } |
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172 } |
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173 |
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174 void CMIDNativeConverter::CalculateAlpha(TMIDInternalARGB& aTargetColor, |
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175 const TMIDInternalARGB& aBelowColor) |
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176 { |
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177 TInt alphaBelow(KAlphaFullOpaque - aTargetColor.iA + 1); |
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178 TInt alpha(aTargetColor.iA); |
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179 |
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180 if (aBelowColor.iA + aTargetColor.iA > KAlphaFullOpaque) |
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181 { |
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182 aTargetColor.iA = KAlphaFullOpaque; |
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183 } |
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184 else |
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185 { |
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186 aTargetColor.iA = (TUint8)(aBelowColor.iA + aTargetColor.iA); |
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187 } |
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188 |
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189 aTargetColor.iR = (TUint8)((aBelowColor.iR * alphaBelow + |
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190 aTargetColor.iR * alpha) >> KAlphaShift); |
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191 |
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192 aTargetColor.iG = (TUint8)((aBelowColor.iG * alphaBelow + |
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193 aTargetColor.iG * alpha) >> KAlphaShift); |
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194 |
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195 aTargetColor.iB = (TUint8)((aBelowColor.iB * alphaBelow + |
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196 aTargetColor.iB * alpha) >> KAlphaShift); |
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197 |
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198 } |
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199 |
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200 TBool CMIDNativeConverter::HasAlphaBitmap() |
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201 { |
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202 return iNativeFormat->IsAlpha(); |
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203 } |