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1 // Copyright (c) 2008-2009 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 "directgdiadapter.h" |
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17 #include "swdirectgdiengine.h" |
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18 #include "swdirectgdiimagesourceimpl.h" |
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19 #include "swdirectgdidriverimpl.h" |
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20 #include <bitdrawinterfaceid.h> |
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21 #include <e32cmn.h> |
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22 #include <bitdraw.h> |
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23 #include <bmalphablend.h> |
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24 #include <graphics/directgdidrawablesource.h> |
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25 #include <pixelformats.h> |
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26 #include "pixelutil.h" |
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27 |
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28 /** |
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29 Helper class to deal with the case of blending 32-bit MAP source into 16-bit target which is not |
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30 supported by screen driver CDrawSixteenBppBitmap implementation. |
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31 |
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32 @publishedPartner |
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33 @prototype |
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34 @deprecated |
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35 */ |
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36 class TDrawDeviceWrapper |
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37 { |
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38 public: |
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39 TDrawDeviceWrapper(CFbsDrawDevice* aDrawDevice, CGraphicsContext::TDrawMode aDrawMode); |
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40 inline void WriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode); |
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41 private: |
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42 inline TUint16 ConvertTo64K(TUint32 aColor); |
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43 inline TUint16 Blend16MapTo64K(TUint16 aDest, TUint32 aSrc); |
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44 void BlendLine16MapTo64K(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode); |
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45 void OriginalWriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode); |
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46 |
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47 private: |
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48 CFbsDrawDevice* iDrawDevice; |
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49 TUint32* iBits; |
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50 |
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51 typedef void (TDrawDeviceWrapper::*TWriteLineFunc)(TInt,TInt,TInt,TUint32*,CGraphicsContext::TDrawMode); |
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52 TWriteLineFunc iWriteLineFunc; |
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53 }; |
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54 |
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55 TDrawDeviceWrapper::TDrawDeviceWrapper(CFbsDrawDevice* aDrawDevice, CGraphicsContext::TDrawMode aDrawMode): |
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56 iDrawDevice(aDrawDevice) |
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57 { |
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58 TAny* interface = NULL; |
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59 TInt err = iDrawDevice->GetInterface(KFastBlit2InterfaceID, interface); |
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60 // interface is guaranted to exist for 16-bit and 32-bit draw device |
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61 GRAPHICS_ASSERT_DEBUG(err == KErrNone, EDirectGdiPanicUnexpectedError); |
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62 |
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63 iBits = (TUint32*) reinterpret_cast<MFastBlit2*>(interface)->Bits(); |
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64 |
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65 // setup which funtion to call here rather tha making decision inside WriteLine which is usually called within |
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66 // a tight scanline loop |
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67 iWriteLineFunc = iDrawDevice->DisplayMode() == EColor64K && aDrawMode == CGraphicsContext::EDrawModePEN ? |
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68 &TDrawDeviceWrapper::BlendLine16MapTo64K : &TDrawDeviceWrapper::OriginalWriteLine; |
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69 } |
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70 |
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71 inline void TDrawDeviceWrapper::WriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode) |
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72 { |
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73 // calling member functions via pointer to member functions i.e. |
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74 // (object.*member_fn)(arg) |
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75 // |
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76 (this->*iWriteLineFunc)(aX, aY, aLength, aBuffer, aDrawMode); |
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77 } |
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78 |
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79 void TDrawDeviceWrapper::OriginalWriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode) |
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80 { |
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81 iDrawDevice->WriteLine(aX, aY, aLength, aBuffer, aDrawMode); |
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82 } |
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83 |
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84 void TDrawDeviceWrapper::BlendLine16MapTo64K(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode) |
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85 { |
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86 TUint16* pixelPtr = reinterpret_cast<TUint16*>(iBits); |
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87 pixelPtr += (aY * iDrawDevice->LongWidth()) + aX; |
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88 const TUint32* bufferPtr = aBuffer; |
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89 const TUint32* bufferPtrLimit = bufferPtr + aLength; |
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90 |
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91 while (bufferPtr < bufferPtrLimit) |
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92 { |
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93 *pixelPtr = Blend16MapTo64K(*pixelPtr, *bufferPtr); |
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94 ++bufferPtr; |
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95 ++pixelPtr; |
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96 } |
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97 } |
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98 |
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99 inline TUint16 TDrawDeviceWrapper::ConvertTo64K(TUint32 aSrc) |
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100 { |
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101 TInt col = (aSrc & 0x0000f8) >> 3; |
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102 col |= (aSrc & 0x00fc00) >> 5; |
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103 col |= (aSrc & 0xf80000) >> 8; |
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104 |
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105 return col; |
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106 } |
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107 |
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108 inline TUint16 TDrawDeviceWrapper::Blend16MapTo64K(TUint16 aDst, TUint32 aSrc) |
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109 { |
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110 const TInt alpha = aSrc >> 24; |
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111 |
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112 if(alpha == 0x00) |
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113 { |
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114 return aDst; |
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115 } |
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116 |
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117 if (alpha == 0xff) |
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118 { |
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119 return ConvertTo64K(aSrc); |
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120 } |
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121 |
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122 // extract source components from 16MAP |
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123 const TInt src_rb = aSrc & 0x00ff00ff; |
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124 const TInt src_g = aSrc & 0x0000ff00; |
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125 const TInt oneMinusAlpha = 0x0100 - alpha; |
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126 |
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127 // extract destination components from 64K format |
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128 TInt dr = (aDst & 0xf800) >> 8; |
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129 dr += dr >> 5; |
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130 TInt dg = (aDst & 0x07e0) >> 3; |
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131 dg += dg >> 6; |
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132 TInt db = (aDst & 0x001f) << 3; |
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133 db += db >> 5; |
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134 |
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135 // combine red and blue components into a word to combine mult in one go |
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136 TInt dst_rb = (dr << 16) | db; |
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137 TInt dst_g = dg << 8; |
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138 |
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139 // dst and src are in pre-multiplied format (64K can be treated both as pre or non-pre) |
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140 // dst = src + (1-alpha) * dst |
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141 // |
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142 dst_rb = (src_rb + ((oneMinusAlpha * dst_rb) >> 8)) & 0x00ff00ff; |
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143 dst_g = (src_g + ((oneMinusAlpha * dst_g) >> 8)) & 0x0000ff00; |
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144 |
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145 const TUint32 argb = 0xff000000 | dst_rb | dst_g; |
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146 return ConvertTo64K(argb); |
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147 } |
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148 |
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149 // |
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150 // implements MDirectGdiEngine interfaces |
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151 // |
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152 |
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153 /** |
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154 @see MDirectGdiEngine::DrawResource(const TRect&,const RDirectGdiDrawableSource&,const TDesC8&) |
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155 */ |
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156 void CSwDirectGdiEngine::DrawResource( |
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157 const TRect& aDestRect, |
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158 const RDirectGdiDrawableSource& aSource, |
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159 const TDesC8& /*aParam*/) |
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160 { |
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161 // DirectGDI reference implementation only support pixel based resource |
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162 // see CSwDirectGdiDriverImpl::CreateDrawableSource() |
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163 // |
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164 CSwDirectGdiImageSourceImpl* imgSrc = NULL; |
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165 TSize imgSize; |
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166 if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone) |
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167 { |
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168 return; |
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169 } |
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170 |
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171 // drawing resource unscaled with no rotation |
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172 // |
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173 DrawResourceCommon(aDestRect, imgSrc, TRect(TPoint(0,0), imgSize), DirectGdi::EGraphicsRotationNone); |
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174 } |
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175 |
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176 /** |
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177 @see MDirectGdiEngine::DrawResource(const TPoint&,const RDirectGdiDrawableSource&,DirectGdi::TGraphicsRotation) |
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178 */ |
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179 void CSwDirectGdiEngine::DrawResource(const TPoint& aPos, |
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180 const RDirectGdiDrawableSource& aSource, |
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181 DirectGdi::TGraphicsRotation aRotation) |
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182 { |
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183 CSwDirectGdiImageSourceImpl* imgSrc = NULL; |
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184 TSize imgSize; |
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185 if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone) |
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186 { |
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187 return; |
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188 } |
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189 |
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190 // drawing resource unscaled |
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191 // |
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192 // rotation will be applied before scaling, we must create destination rectangle |
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193 // that match the size of rotated image |
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194 |
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195 TRect destRect(aPos, imgSize); |
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196 if (aRotation==DirectGdi::EGraphicsRotation90 || aRotation==DirectGdi::EGraphicsRotation270) |
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197 { |
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198 // keep the top left corner in the same position but swap width and height |
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199 destRect.SetWidth(imgSize.iHeight); |
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200 destRect.SetHeight(imgSize.iWidth); |
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201 } |
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202 |
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203 DrawResourceCommon(destRect, imgSrc, TRect(TPoint(0,0), imgSize), aRotation); |
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204 } |
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205 |
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206 /** |
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207 @see MDirectGdiEngine::DrawResource(const TRect&,const RDirectGdiDrawableSource&,DirectGdi::TGraphicsRotation) |
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208 */ |
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209 void CSwDirectGdiEngine::DrawResource(const TRect& aDestRect, |
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210 const RDirectGdiDrawableSource& aSource, |
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211 DirectGdi::TGraphicsRotation aRotation) |
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212 { |
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213 // aDestRect is not empty when we reach here |
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214 // |
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215 CSwDirectGdiImageSourceImpl* imgSrc = NULL; |
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216 TSize imgSize; |
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217 if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone) |
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218 { |
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219 return; |
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220 } |
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221 |
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222 DrawResourceCommon(aDestRect, imgSrc, TRect(TPoint(0,0), imgSize), aRotation); |
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223 } |
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224 |
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225 /** |
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226 @see MDirectGdiEngine::DrawResource(const TRect&,const RDirectGdiDrawableSource&,const TRect&,DirectGdi::TGraphicsRotation) |
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227 */ |
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228 void CSwDirectGdiEngine::DrawResource( |
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229 const TRect& aDestRect, |
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230 const RDirectGdiDrawableSource& aSource, |
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231 const TRect& aSrcRect, |
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232 DirectGdi::TGraphicsRotation aRotation) |
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233 { |
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234 // pre: |
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235 // aDestRect and aSrcRect are not empty |
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236 // |
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237 CSwDirectGdiImageSourceImpl* imgSrc = NULL; |
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238 TSize imgSize; |
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239 if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone) |
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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 // check source rectangle is fully contained within the image resource extent |
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245 if (aSrcRect.iTl.iX < 0 || |
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246 aSrcRect.iTl.iY < 0 || |
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247 aSrcRect.iBr.iX > imgSize.iWidth || |
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248 aSrcRect.iBr.iY > imgSize.iHeight) |
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249 { |
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250 iDriver->SetError(KErrArgument); |
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251 return; |
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252 } |
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253 |
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254 DrawResourceCommon(aDestRect, imgSrc, aSrcRect, aRotation); |
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255 } |
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256 |
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257 // |
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258 // internal functions |
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259 // |
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260 /** |
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261 Checks image resource is fully constructed and registered with the driver. |
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262 |
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263 @param aHandle A valid handle to an image source. |
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264 @param aImg On return, contains the image source. |
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265 @param aSize If not NULL, will contain the dimensions of the image source. |
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266 @return KErrNone if successful, KErrBadHandle if aHandle is not a valid handle to an image source. |
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267 */ |
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268 TInt CSwDirectGdiEngine::CheckImageSource(TInt aHandle, CSwDirectGdiImageSourceImpl*& aImg, TSize* aSize) |
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269 { |
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270 // check image exist |
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271 if (!iDriver->ValidImageSource(aHandle)) |
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272 { |
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273 // replace KErrNotFound |
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274 const TInt err = KErrBadHandle; |
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275 iDriver->SetError(err); |
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276 return err; |
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277 } |
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278 |
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279 aImg = reinterpret_cast<CSwDirectGdiImageSourceImpl*>(aHandle); |
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280 |
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281 // RSgImage cannot be created with zero size, so there is no point in validating its size and |
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282 // simply return image size if requested |
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283 if (aSize) |
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284 { |
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285 *aSize = aImg->Size(); |
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286 } |
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287 |
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288 return KErrNone; |
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289 } |
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290 |
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291 /** |
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292 Implements common DrawResource() functionality used by all DrawResource() variants. |
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293 */ |
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294 void CSwDirectGdiEngine::DrawResourceCommon( |
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295 const TRect& aDestRect, |
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296 const CSwDirectGdiImageSourceImpl* aImg, |
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297 const TRect& aSrcRect, |
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298 DirectGdi::TGraphicsRotation aRotation) |
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299 { |
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300 // pre: |
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301 // aDestRect and aSrcRect are not empty |
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302 // aSrcRect is within the image extent |
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303 // |
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304 // translate relative coord to target absolute coord system |
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305 TRect destRectAbs(aDestRect); |
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306 destRectAbs.Move(iOrigin); |
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307 |
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308 // check whether we need to blend or write |
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309 const TBool opaqueSource = (!PixelFormatUtil::HasAlpha(aImg->PixelFormat())) && (iDrawMode == DirectGdi::EDrawModePEN); |
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310 if (opaqueSource) |
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311 { |
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312 iDrawMode = DirectGdi::EDrawModeWriteAlpha; |
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313 } |
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314 |
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315 // repeat drawing op for each rectangle in the clipping region |
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316 const TInt numOfRects = iDefaultRegionPtr->Count(); |
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317 for (TInt idx = 0; idx < numOfRects; ++idx) |
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318 { |
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319 TRect clipRectAbs = (*iDefaultRegionPtr)[idx]; |
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320 if (!clipRectAbs.Intersects(destRectAbs)) |
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321 { |
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322 continue; |
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323 } |
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324 |
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325 // intersect current clip rect with dest rect to get actual draw area |
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326 clipRectAbs.Intersection(destRectAbs); |
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327 DoDrawResource(destRectAbs, aImg, aSrcRect, aRotation, clipRectAbs); |
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328 |
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329 iDrawDevice->UpdateRegion(clipRectAbs); |
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330 } |
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331 |
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332 if (opaqueSource) |
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333 { |
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334 iDrawMode = DirectGdi::EDrawModePEN; |
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335 } |
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336 } |
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337 |
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338 /** |
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339 Rotate a given rectangle 90 degree clockwise around the specified origin. |
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340 */ |
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341 void CSwDirectGdiEngine::Rotate90(TRect& aRect, const TPoint& aOrigin) |
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342 { |
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343 // rotated bottom-left become top-left of rotated rect |
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344 // |
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345 TPoint bl(aRect.iTl.iX, aRect.iBr.iY); |
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346 const TInt w = aRect.Width(); |
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347 const TInt h = aRect.Height(); |
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348 |
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349 const TPoint dbl = bl - aOrigin; |
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350 bl.iX = aOrigin.iX - dbl.iY; |
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351 bl.iY = aOrigin.iY + dbl.iX; |
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352 |
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353 aRect = TRect(bl, TSize(h,w)); |
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354 } |
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355 |
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356 /** |
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357 Rotate a given rectangle 180 degree clockwise around the specified origin. |
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358 */ |
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359 void CSwDirectGdiEngine::Rotate180(TRect& aRect, const TPoint& aOrigin) |
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360 { |
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361 // rotated bottom-right become top-left of rotated rect |
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362 // |
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363 TPoint br(aRect.iBr); |
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364 const TSize sz = aRect.Size(); |
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365 |
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366 const TPoint dbr = br - aOrigin; |
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367 br.iX = aOrigin.iX - dbr.iX; |
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368 br.iY = aOrigin.iY - dbr.iY; |
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369 |
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370 aRect = TRect(br, sz); |
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371 } |
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372 |
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373 /** |
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374 Rotate a given rectangle 270 degree clockwise around the specified origin. |
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375 */ |
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376 void CSwDirectGdiEngine::Rotate270(TRect& aRect, const TPoint& aOrigin) |
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377 { |
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378 // rotated top-right become top-left of rotated rect |
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379 // |
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380 TPoint tr(aRect.iBr.iX, aRect.iTl.iY); |
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381 const TInt w = aRect.Width(); |
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382 const TInt h = aRect.Height(); |
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383 |
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384 const TPoint dtr = tr - aOrigin; |
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385 tr.iX = aOrigin.iX + dtr.iY; |
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386 tr.iY = aOrigin.iY - dtr.iX; |
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387 |
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388 aRect = TRect(tr, TSize(h,w)); |
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389 } |
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390 |
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391 /** |
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392 Tests that the size of a given rotated rectangle match the image source extent. |
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393 */ |
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394 TBool CSwDirectGdiEngine::RotatedSizeMatch(const TRect& aDst, const TRect& aSrc, DirectGdi::TGraphicsRotation aRot) |
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395 { |
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396 if (aRot==DirectGdi::EGraphicsRotationNone || aRot==DirectGdi::EGraphicsRotation180) |
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397 { |
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398 return aDst.Size()==aSrc.Size(); |
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399 } |
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400 else |
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401 { |
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402 return aDst.Width()==aSrc.Height() && aDst.Height()==aSrc.Width(); |
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403 } |
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404 } |
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405 |
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406 /** |
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407 Draws a rectangular area of resource and apply rotation and/or scaling if requested. |
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408 */ |
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409 void CSwDirectGdiEngine::DoDrawResource( |
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410 const TRect& aDestRectAbs, |
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411 const CSwDirectGdiImageSourceImpl* aImg, |
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412 const TRect& aSrcRect, |
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413 DirectGdi::TGraphicsRotation aRotation, |
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414 const TRect& aClipRectAbs) |
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415 { |
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416 // pre: |
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417 // SetClippingRegion() already check that clipping region is always contained |
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418 // within device full extent. |
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419 |
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420 // check src rect match the size of rotated dest rect |
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421 if (RotatedSizeMatch(aDestRectAbs, aSrcRect, aRotation)) |
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422 { |
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423 // aClipRect is the effective drawing clipped area, it has been intersected with dest rect by the |
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424 // calling function/DoDrawResourceCommon() and it is not empty when we reach here |
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425 |
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426 // image size has been checked at the top level DrawResource() no need to check it again |
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427 |
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428 // use aClipRect to determine how much area should be read from the image and transform |
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429 // the effective read area into source rect depending on rotation parameter |
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430 |
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431 // start with aClipRect |
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432 TRect xformSrcRect(aClipRectAbs); |
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433 switch (aRotation) |
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434 { |
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435 case DirectGdi::EGraphicsRotationNone: |
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436 // align top-left corner of dest rect with top-left corner of src rect |
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437 xformSrcRect.Move(aSrcRect.iTl - aDestRectAbs.iTl); |
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438 break; |
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439 case DirectGdi::EGraphicsRotation90: |
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440 { |
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441 // align top-right corner of dest rect with top-left corner of src rect |
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442 xformSrcRect.Move(aSrcRect.iTl - TPoint(aDestRectAbs.iBr.iX, aDestRectAbs.iTl.iY)); |
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443 // rotate 270 (-90) degree using top-left corner of src rect as pivot point |
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444 Rotate270(xformSrcRect, aSrcRect.iTl); |
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445 } |
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446 break; |
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447 case DirectGdi::EGraphicsRotation180: |
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448 { |
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449 // align bottom-right corner of dest rect with top-left corner of src rect |
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450 xformSrcRect.Move(aSrcRect.iTl - aDestRectAbs.iBr); |
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451 // rotate 180 (-180) degree using top-left corner of src rect as pivot point |
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452 Rotate180(xformSrcRect, aSrcRect.iTl); |
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453 } |
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454 break; |
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455 case DirectGdi::EGraphicsRotation270: |
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456 { |
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457 // align bottom-left corner of dest rect with top-left corner of src rect |
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458 xformSrcRect.Move(aSrcRect.iTl - TPoint(aDestRectAbs.iTl.iX, aDestRectAbs.iBr.iY)); |
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459 // rotate 90 (-270) degree using top-left corner of src rect as pivot point |
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460 Rotate90(xformSrcRect, aSrcRect.iTl); |
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461 } |
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462 break; |
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463 |
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464 // no need for extra check, aRotation has been checked at generic layer |
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465 } |
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466 |
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467 DoBlitResource(aClipRectAbs.iTl, aImg, xformSrcRect, aRotation); |
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468 return; |
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469 } |
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470 |
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471 DoScaledBlitResource(aDestRectAbs, aImg, aSrcRect, aRotation, aClipRectAbs); |
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472 } |
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473 |
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474 /** |
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475 Draws a rectangular area of resource rotated with no scaling. |
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476 @panic DGDIAdapter 1009, if the pixel format of the draw device is unknown (debug only). |
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477 */ |
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478 void CSwDirectGdiEngine::DoBlitResource( |
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479 const TPoint& aDest, |
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480 const CSwDirectGdiImageSourceImpl* aImg, |
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481 const TRect& aSrcRect, |
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482 DirectGdi::TGraphicsRotation aRotation) |
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483 { |
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484 // pre: |
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485 // aDest is the top-left of clipped destination rectangle i.e. intersection of user destination |
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486 // rectangle with current clipping rect |
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487 // aSrcRect is rotated clipped read area i.e. effective read area with respect to original |
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488 // image orientation i.e.it no longer represents user specified source rect. |
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489 |
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490 // no need to do extra check on parameters here because: |
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491 // aDest is guaranteed to be within device drawing area |
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492 // aSrcRect is guaranteed to be within image source area |
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493 |
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494 const TUidPixelFormat devFormat = PixelFormatUtil::ConvertToPixelFormat(iDrawDevice->DisplayMode()); |
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495 GRAPHICS_ASSERT_DEBUG(devFormat != EUidPixelFormatUnknown, EDirectGdiPanicInvalidDisplayMode); |
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496 |
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497 const TUidPixelFormat imgFormat = aImg->PixelFormat(); |
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498 const TUint32* imgAddr = reinterpret_cast<TUint32*>(aImg->DataBuffer()); |
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499 const TInt imgStride = aImg->Stride(); |
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500 const TSize imgSize = aImg->Size(); |
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501 const CGraphicsContext::TDrawMode drawMode = GcDrawMode(iDrawMode); |
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502 |
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503 const TInt width = aSrcRect.Width(); |
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504 const TInt height = aSrcRect.Height(); |
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505 // write scanline starting from top dest row |
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506 TInt destY = aDest.iY; |
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507 // setup pixel reader toolkit |
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508 TPixelBufferReader reader(imgAddr, imgSize, imgStride, imgFormat); |
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509 TDrawDeviceWrapper writer(iDrawDevice, GcDrawMode(iDrawMode)); |
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510 |
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511 // |
|
512 // special case when rotation is none |
|
513 // |
|
514 if (aRotation == DirectGdi::EGraphicsRotationNone) |
|
515 { |
|
516 TAny* interface = NULL; |
|
517 |
|
518 // source and destination format match and using write alpha mode i.e. reduce blit to memcpy |
|
519 if (iDrawMode == DirectGdi::EDrawModeWriteAlpha && devFormat == imgFormat) |
|
520 { |
|
521 TInt err = iDrawDevice->GetInterface(KFastBlit2InterfaceID, interface); |
|
522 if (err == KErrNone) |
|
523 { |
|
524 GRAPHICS_ASSERT_DEBUG(interface, EDirectGdiPanicInvalidPointer); |
|
525 MFastBlit2* fblit = static_cast<MFastBlit2*>(interface); |
|
526 err = fblit->WriteBitmapBlock(aDest, imgAddr, imgStride, imgSize, aSrcRect); |
|
527 if (err == KErrNone) |
|
528 { |
|
529 return; |
|
530 } |
|
531 } |
|
532 } |
|
533 |
|
534 // fallback from MFastBlit2 when source and destination format match. |
|
535 // Note that there was previously an optimization added here that used MFlastBlend if |
|
536 // available, however it did not work correctly for some cases using DrawResource so has been |
|
537 // removed from this code. (A source drawn with OpenGLES on to a target in XRGB_8888 format |
|
538 // actually had alpha in the unused channel which was being drawn by MFastBlend) |
|
539 if (devFormat == imgFormat) |
|
540 { |
|
541 for (TInt row=aSrcRect.iTl.iY; row<aSrcRect.iBr.iY; ++row,++destY) |
|
542 { |
|
543 const TPoint pos(aSrcRect.iTl.iX, row); |
|
544 const TUint32* slptr = reader.GetPixelAddr(pos); |
|
545 writer.WriteLine(aDest.iX, destY, width, const_cast<TUint32*>(slptr), drawMode); |
|
546 } |
|
547 |
|
548 return; |
|
549 } |
|
550 |
|
551 // there is one additional case that can be optimised by eleminating copy when: |
|
552 // rotation : none |
|
553 // scaling : none |
|
554 // dst : opaque |
|
555 // src : has alpha and premultiplied |
|
556 // mode : PEN |
|
557 } |
|
558 |
|
559 // |
|
560 // generic cases |
|
561 // |
|
562 // copying is necessary either to convert pixel format or to read back buffer in reverse order |
|
563 // to achieve rotation |
|
564 // |
|
565 const TInt scanLineBytes = iDrawDevice->ScanLineBytes(); |
|
566 TUint32* scanLineBuffer = iDrawDevice->ScanLineBuffer(); |
|
567 TPtr8 scanLineDes(reinterpret_cast<TUint8*>(scanLineBuffer),scanLineBytes,scanLineBytes); |
|
568 |
|
569 // if destination is opaque e.g. RGB_565, XRGB_8888 and the source has alpha, it shall blend |
|
570 // (because iDrawMode is set to WritePEN) |
|
571 // we treat opaque destination as in pre-multiplied format (with alpha value 1), and read the |
|
572 // source in pre-multiplied format too, to enable optimum blending computation i.e. |
|
573 // "src + (1-alpha) * dst" |
|
574 const TUidPixelFormat readFormat = !PixelFormatUtil::HasAlpha(devFormat) && |
|
575 iDrawMode == DirectGdi::EDrawModePEN ? |
|
576 EUidPixelFormatARGB_8888_PRE : devFormat; |
|
577 |
|
578 if (aRotation == DirectGdi::EGraphicsRotationNone) |
|
579 { |
|
580 // general fallback from FastBlendBitmap |
|
581 // |
|
582 const TInt readLen = width; |
|
583 // normal read scanline, left to right |
|
584 // |
|
585 for (TInt row=aSrcRect.iTl.iY; row<aSrcRect.iBr.iY; ++row,++destY) |
|
586 { |
|
587 const TPoint pos(aSrcRect.iTl.iX, row); |
|
588 reader.GetScanLine(scanLineDes,pos, readLen, readFormat, TPixelBufferReader::EReadHorizontal); |
|
589 writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode); |
|
590 } |
|
591 } |
|
592 else if (aRotation == DirectGdi::EGraphicsRotation90) |
|
593 { |
|
594 const TInt readLen = height; |
|
595 // read scanline vertically from bottom to up, and from the lef-most column |
|
596 // |
|
597 for (TInt col=aSrcRect.iTl.iX; col<aSrcRect.iBr.iX; ++col,++destY) |
|
598 { |
|
599 const TPoint pos(col, aSrcRect.iBr.iY-1); |
|
600 reader.GetScanLine(scanLineDes, pos, readLen, readFormat, TPixelBufferReader::EReadVerticalReverse); |
|
601 writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode); |
|
602 } |
|
603 } |
|
604 else if (aRotation == DirectGdi::EGraphicsRotation180) |
|
605 { |
|
606 const TInt readLen = width; |
|
607 // read scanline from right to left, starting from the most bottom scanline |
|
608 // |
|
609 for (TInt row=aSrcRect.iBr.iY-1; row>=aSrcRect.iTl.iY; --row,++destY) |
|
610 { |
|
611 const TPoint pos(aSrcRect.iBr.iX-1, row); |
|
612 reader.GetScanLine(scanLineDes, pos, readLen, readFormat, TPixelBufferReader::EReadHorizontalReverse); |
|
613 writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode); |
|
614 } |
|
615 } |
|
616 else if (aRotation == DirectGdi::EGraphicsRotation270) |
|
617 { |
|
618 const TInt readLen = height; |
|
619 // read scanline vertically top to bottom, and from the right-most column |
|
620 // |
|
621 for (TInt col=aSrcRect.iBr.iX-1; col>=aSrcRect.iTl.iX; --col,++destY) |
|
622 { |
|
623 const TPoint pos(col, aSrcRect.iTl.iY); |
|
624 reader.GetScanLine(scanLineDes, pos, readLen, readFormat, TPixelBufferReader::EReadVertical); |
|
625 writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode); |
|
626 } |
|
627 } |
|
628 } |
|
629 |
|
630 /** |
|
631 Draws a rectangular area of resource rotated and/or scaled up/down. |
|
632 @panic DGDIAdapter 1009, if the pixel format of the draw device is unknown (debug only). |
|
633 */ |
|
634 void CSwDirectGdiEngine::DoScaledBlitResource( |
|
635 const TRect& aDestRectAbs, |
|
636 const CSwDirectGdiImageSourceImpl* aImg, |
|
637 const TRect& aSrcRect, |
|
638 DirectGdi::TGraphicsRotation aRotation, |
|
639 const TRect& aClipRectAbs) |
|
640 { |
|
641 // pre: |
|
642 // aDestRectAbs is the user specified dest rect that has been translated to target coord system. It may |
|
643 // be larger/outside the target drawing area. We must not modify this rect as it will be used to |
|
644 // determine the scaling factor. |
|
645 // aSrcRect is the user specified src rect, it is within the image extent. |
|
646 // aClipRectAbs is the intersection of current clipping rect and aDestRectAbs and is within the |
|
647 // target drawing area. |
|
648 |
|
649 const TUidPixelFormat devFormat = PixelFormatUtil::ConvertToPixelFormat(iDrawDevice->DisplayMode()); |
|
650 GRAPHICS_ASSERT_DEBUG(devFormat != EUidPixelFormatUnknown, EDirectGdiPanicInvalidDisplayMode); |
|
651 |
|
652 const TUint32* imgAddr = reinterpret_cast<TUint32*>(aImg->DataBuffer()); |
|
653 const TInt imgStride = aImg->Stride(); |
|
654 const TSize imgSize = aImg->Size(); |
|
655 const TUidPixelFormat imgFormat = aImg->PixelFormat(); |
|
656 const CGraphicsContext::TDrawMode drawMode = GcDrawMode(iDrawMode); |
|
657 |
|
658 // if destination is opaque e.g. RGB_565, XRGB_8888 and the source has alpha, it shall blend |
|
659 // (because iDrawMode is set to WritePEN) |
|
660 // we treat opaque destination as in pre-multiplied format (with alpha value 1), and read the |
|
661 // source in pre-multiplied format too, to enable optimum blending computation i.e. |
|
662 // "src + (1-alpha) * dst" |
|
663 const TUidPixelFormat readFormat = !PixelFormatUtil::HasAlpha(devFormat) && |
|
664 iDrawMode == DirectGdi::EDrawModePEN ? |
|
665 EUidPixelFormatARGB_8888_PRE : devFormat; |
|
666 |
|
667 TUint32* scanLineBuffer = iDrawDevice->ScanLineBuffer(); |
|
668 const TInt scanLineBytes = iDrawDevice->ScanLineBytes(); |
|
669 TPtr8 scanLineDes(reinterpret_cast<TUint8*>(scanLineBuffer), scanLineBytes, scanLineBytes); |
|
670 |
|
671 // setup pixel reader toolkit |
|
672 // |
|
673 TPixelBufferReader reader(imgAddr, imgSize, imgStride, imgFormat); |
|
674 TDrawDeviceWrapper writer(iDrawDevice, GcDrawMode(iDrawMode)); |
|
675 |
|
676 if (aRotation == DirectGdi::EGraphicsRotationNone) |
|
677 { |
|
678 // Note that there was previously an optimization added here that used MFlastBlend if |
|
679 // available, however it did not work correctly for some cases using DrawResource so has been |
|
680 // removed from this code. (A source drawn with OpenGLES on to a target in XRGB_8888 format |
|
681 // actually had alpha in the unused channel which was being drawn by MFastBlend) |
|
682 // |
|
683 const TInt srcLen = aSrcRect.Width(); |
|
684 const TInt destLen = aDestRectAbs.Width(); |
|
685 const TInt clipLen = aClipRectAbs.Width(); |
|
686 const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX; |
|
687 |
|
688 // setup DDA for scaling in Y direction based on src rect and dst rect size |
|
689 // scaling in X direction will be done by GetScaledScanLine() |
|
690 // |
|
691 // setup Y scaler and start from top-left of src/dest to bottom-right of src/dest |
|
692 |
|
693 TLinearDDA yScaler; |
|
694 yScaler.Construct( |
|
695 TPoint(aSrcRect.iTl.iY, aDestRectAbs.iTl.iY), |
|
696 TPoint(aSrcRect.iBr.iY, aDestRectAbs.iBr.iY), |
|
697 TLinearDDA::ELeft); |
|
698 |
|
699 // move to position of current clip rect top row as the start of dest Y |
|
700 TInt srcY; |
|
701 yScaler.JumpToYCoord2(srcY, aClipRectAbs.iTl.iY); |
|
702 |
|
703 // yPos contains mapping between src Y (TPoint.iX) and dest Y (TPoint.iY) |
|
704 TPoint yPos(srcY, aClipRectAbs.iTl.iY); |
|
705 |
|
706 // write to target from top to bottom |
|
707 // |
|
708 while (yPos.iY < aClipRectAbs.iBr.iY) |
|
709 { |
|
710 reader.GetScaledScanLine(scanLineDes, |
|
711 TPoint(aSrcRect.iTl.iX, yPos.iX), // src X and Y |
|
712 clipPos, // clipped dest X |
|
713 clipLen, |
|
714 destLen, |
|
715 srcLen, |
|
716 readFormat, |
|
717 TPixelBufferReader::EReadHorizontal); |
|
718 |
|
719 // use dest Y here |
|
720 writer.WriteLine(aClipRectAbs.iTl.iX, yPos.iY, clipLen, scanLineBuffer, drawMode); |
|
721 |
|
722 // move scaler one position |
|
723 yScaler.NextStep(yPos); |
|
724 }; |
|
725 } |
|
726 else if (aRotation == DirectGdi::EGraphicsRotation90) |
|
727 { |
|
728 // we're going to read source vertically from bottom to up, swap relevant bits and pieces |
|
729 // dst-width corresponds to src-height |
|
730 // dst-height corresponds to src-width |
|
731 // |
|
732 const TInt srcLen = aSrcRect.Height(); |
|
733 const TInt destLen = aDestRectAbs.Width(); |
|
734 |
|
735 // the following doesn't change, the amount of pixel read (vertically) will be based on |
|
736 // the drawing area witdh i.e. clip width |
|
737 // |
|
738 const TInt clipLen = aClipRectAbs.Width(); |
|
739 |
|
740 // offset into read area doesn't change either, it will be translated into some Y position |
|
741 // from bottom row of source image |
|
742 const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX; |
|
743 |
|
744 // setup DDA for scaling in src X direction based on src rect and dst rect size |
|
745 // scaling in src Y direction will be done by GetScaledScanLine(EReadVerticalReverse) |
|
746 // |
|
747 // scaler map dest Y to src X because of 90 degre rotation |
|
748 // start from top row dest, left-most column src to bottom row dest, right-most column src |
|
749 // |
|
750 TLinearDDA xScaler; |
|
751 xScaler.Construct( |
|
752 TPoint(aSrcRect.iTl.iX, aDestRectAbs.iTl.iY), |
|
753 TPoint(aSrcRect.iBr.iX, aDestRectAbs.iBr.iY), |
|
754 TLinearDDA::ELeft); |
|
755 |
|
756 // move to position of current clip rect top row as the start of src X |
|
757 TInt srcX; |
|
758 xScaler.JumpToYCoord2(srcX, aClipRectAbs.iTl.iY); |
|
759 |
|
760 // xPos contains mapping between src X (TPoint.iX) and dest Y (TPoint.iY) |
|
761 TPoint xPos(srcX, aClipRectAbs.iTl.iY); |
|
762 |
|
763 // write to target from top to bottom |
|
764 // |
|
765 while (xPos.iY < aClipRectAbs.iBr.iY) |
|
766 { |
|
767 // read pixel vertically from left column to right |
|
768 reader.GetScaledScanLine(scanLineDes, |
|
769 TPoint(xPos.iX, aSrcRect.iBr.iY - 1), // src X, src Y |
|
770 clipPos, // distance from bottom source |
|
771 clipLen, |
|
772 destLen, |
|
773 srcLen, |
|
774 readFormat, |
|
775 TPixelBufferReader::EReadVerticalReverse); |
|
776 |
|
777 // use dest Y here |
|
778 writer.WriteLine(aClipRectAbs.iTl.iX, xPos.iY, clipLen, scanLineBuffer, drawMode); |
|
779 |
|
780 // move scaler one position |
|
781 xScaler.NextStep(xPos); |
|
782 } |
|
783 } |
|
784 else if (aRotation == DirectGdi::EGraphicsRotation180) |
|
785 { |
|
786 const TInt srcLen = aSrcRect.Width(); |
|
787 const TInt destLen = aDestRectAbs.Width(); |
|
788 const TInt clipLen = aClipRectAbs.Width(); |
|
789 |
|
790 // clipPos doesn't need to be inverted (using iBr.iX) because the yScaler below |
|
791 // will do that for us (by stepping backward) |
|
792 // |
|
793 const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX; |
|
794 |
|
795 // setup DDA for scaling in Y direction based on src rect and dst rect size |
|
796 // scaling in X direction will be done by GetScaledScanLine() |
|
797 // |
|
798 // setup Y scaler and start from bottom-right of src/dest to top-left of src/dest |
|
799 // to do backward stepping (src Y inversion) |
|
800 |
|
801 TLinearDDA yScaler; |
|
802 yScaler.Construct( |
|
803 // we starting from 1st pixel from bottom of source image, we need to |
|
804 // step back 1 position as bottom-row coord is beyond the last pixel in the source rect |
|
805 TPoint(aSrcRect.iBr.iY - 1, aDestRectAbs.iTl.iY), |
|
806 TPoint(aSrcRect.iTl.iY - 1, aDestRectAbs.iBr.iY), |
|
807 TLinearDDA::ELeft); |
|
808 |
|
809 // move to position of current clip rect top row as the start of dest Y |
|
810 // which will calculate inverted src Y distance from bottom of source rectangle |
|
811 TInt invSrcY; |
|
812 yScaler.JumpToYCoord2(invSrcY, aClipRectAbs.iTl.iY); |
|
813 |
|
814 // yPos contains mapping between inverted src Y (TPoint.iX) and dest Y (TPoint.iY) |
|
815 TPoint yPos(invSrcY, aClipRectAbs.iTl.iY); |
|
816 |
|
817 // write to target from top to bottom |
|
818 // |
|
819 while (yPos.iY < aClipRectAbs.iBr.iY) |
|
820 { |
|
821 // read scanline from righ to left i.e. use aSrcRect.iBr.iX-1 (last column) |
|
822 // as starting src X value |
|
823 reader.GetScaledScanLine(scanLineDes, |
|
824 TPoint(aSrcRect.iBr.iX - 1, yPos.iX), // src X and inverted src Y |
|
825 clipPos, // clipped dest X |
|
826 clipLen, |
|
827 destLen, |
|
828 srcLen, |
|
829 readFormat, |
|
830 TPixelBufferReader::EReadHorizontalReverse); |
|
831 |
|
832 // use dest Y here |
|
833 writer.WriteLine(aClipRectAbs.iTl.iX, yPos.iY, clipLen, scanLineBuffer, drawMode); |
|
834 |
|
835 // move scaler one position |
|
836 yScaler.NextStep(yPos); |
|
837 } |
|
838 } |
|
839 else if(aRotation == DirectGdi::EGraphicsRotation270) |
|
840 { |
|
841 // we're going to read source vertically from top to bottom, swap relevant bits and pieces |
|
842 // dst-width corresponds to src-height |
|
843 // dst-height corresponds to src-width |
|
844 const TInt srcLen = aSrcRect.Height(); |
|
845 const TInt destLen = aDestRectAbs.Width(); |
|
846 |
|
847 // the following doesn't change, the amount of pixel read (vertically) will be based on |
|
848 // the drawing area witdh i.e. clip width |
|
849 const TInt clipLen = aClipRectAbs.Width(); |
|
850 |
|
851 // offset into read area doesn't change either, it will be translated into some Y position |
|
852 // from top row of source image |
|
853 const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX; |
|
854 |
|
855 // setup DDA for scaling in src X direction based on src rect and dst rect size |
|
856 // scaling in src Y direction will be done by GetScaledScanLine(EReadVertical) |
|
857 // |
|
858 // scaler map dest Y to src X because of 270 degre rotation |
|
859 // start from top row dest, right-most column src to bottom row dest, left-most column src |
|
860 |
|
861 TLinearDDA xScaler; |
|
862 xScaler.Construct( |
|
863 // decrement 1 pixel to get into last pixel within source |
|
864 TPoint(aSrcRect.iBr.iX - 1, aDestRectAbs.iTl.iY), |
|
865 TPoint(aSrcRect.iTl.iX - 1, aDestRectAbs.iBr.iY), |
|
866 TLinearDDA::ELeft); |
|
867 |
|
868 // move to position of current clip rect top row as the start of src X |
|
869 TInt srcX; |
|
870 xScaler.JumpToYCoord2(srcX, aClipRectAbs.iTl.iY); |
|
871 // xPos contains mapping between src X (TPoint.iX) and dest Y (TPoint.iY) |
|
872 TPoint xPos(srcX, aClipRectAbs.iTl.iY); |
|
873 |
|
874 // write to target from top to bottom |
|
875 // |
|
876 while (xPos.iY < aClipRectAbs.iBr.iY) |
|
877 { |
|
878 // read pixel vertically from left column to right |
|
879 reader.GetScaledScanLine(scanLineDes, |
|
880 TPoint(xPos.iX, aSrcRect.iTl.iY), // src X, src Y |
|
881 clipPos, // distance from bottom source |
|
882 clipLen, |
|
883 destLen, |
|
884 srcLen, |
|
885 readFormat, |
|
886 TPixelBufferReader::EReadVertical); |
|
887 |
|
888 // use dest Y here |
|
889 writer.WriteLine(aClipRectAbs.iTl.iX, xPos.iY, clipLen, scanLineBuffer, drawMode); |
|
890 |
|
891 // move scaler one position |
|
892 xScaler.NextStep(xPos); |
|
893 } |
|
894 } |
|
895 } |