author | Mikael Laine <mikael.laine@ixonos.com> |
Fri, 29 Jan 2010 14:08:33 +0200 | |
changeset 0 | 951a5db380a0 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010 Ixonos Plc. |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - Initial contribution |
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* |
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* Contributors: |
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* Ixonos Plc |
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* |
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* Description: |
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* |
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*/ |
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//----IMAAMI---- |
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//************************************************************************* |
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//DCDithering.cpp |
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// |
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//Version 1.00 |
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// |
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//Contains: |
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// CDCDithering |
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// |
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//History: |
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// 19.08.2003 version 1.00 created using existing IMAAMI algorithms |
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//************************************************************************* |
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// Include Files |
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#include <e32std.h> // The basic definitions |
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#include <fbs.h> // For FBS bitmap |
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#include "DCDithering.h" // The DCDithering class |
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// MEMBER FUNCTIONS |
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//============================================================================= |
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|
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/* |
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----------------------------------------------------------------------------- |
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CDCDithering |
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Constructor |
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Default constructor |
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Return Values: none |
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----------------------------------------------------------------------------- |
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*/ |
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CDCDithering::CDCDithering() |
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{ |
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// This function is intentionally left blank. |
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} |
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/* |
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----------------------------------------------------------------------------- |
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CDCDithering |
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NewLC |
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Factory function to instantiate the class. |
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This function leaves the class pointer to the cleanup stack |
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May leave with KErrNoMemory if no memory available |
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Return Values: CDCDithering* self: pointer to the class instance |
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----------------------------------------------------------------------------- |
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*/ |
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CDCDithering* CDCDithering::NewLC() |
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{ |
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CDCDithering* self = new (ELeave) CDCDithering(); |
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CleanupStack::PushL(self); |
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self->ConstructL(); |
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return self; |
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} |
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/* |
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----------------------------------------------------------------------------- |
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CDCDithering |
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NewL |
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Factory function to instantiate the class. |
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May leave with KErrNoMemory if no memory available |
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Return Values: CDCDithering* self: pointer to the class instance |
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----------------------------------------------------------------------------- |
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*/ |
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CDCDithering* CDCDithering::NewL() |
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{ |
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CDCDithering* self = CDCDithering::NewLC(); |
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CleanupStack::Pop(); |
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return self; |
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} |
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/* |
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----------------------------------------------------------------------------- |
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CDCDithering |
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ConstructL |
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122 |
Second phase constructor. Does nothing at the moment |
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123 |
|
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124 |
Return Values: none |
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125 |
|
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126 |
----------------------------------------------------------------------------- |
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127 |
*/ |
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128 |
void CDCDithering::ConstructL() |
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129 |
{ |
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130 |
// This function is intentionally left blank. |
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131 |
} |
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132 |
|
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133 |
|
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134 |
|
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135 |
|
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136 |
/* |
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137 |
----------------------------------------------------------------------------- |
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138 |
|
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139 |
CDCDithering |
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140 |
|
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141 |
Destructor |
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142 |
|
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143 |
Return Values: none |
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144 |
|
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145 |
----------------------------------------------------------------------------- |
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146 |
*/ |
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147 |
CDCDithering::~CDCDithering() |
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148 |
{ |
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149 |
// This function is intentionally left blank. |
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150 |
} |
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151 |
|
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152 |
|
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153 |
|
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154 |
/* |
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155 |
----------------------------------------------------------------------------- |
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156 |
|
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157 |
ProcessL |
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158 |
|
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159 |
Process image referenced by aImage (modify aImage). |
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160 |
May leave with KErrNoMemory if no memory available |
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161 |
|
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162 |
Return Values: none |
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163 |
|
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164 |
----------------------------------------------------------------------------- |
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165 |
*/ |
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166 |
void CDCDithering::ProcessL(CFbsBitmap& aImage) |
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167 |
{ |
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168 |
TUint r, g, b; // Color components |
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169 |
TUint8* dataPtr; // Pointer to data |
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170 |
|
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171 |
//Dithering variables, init to 0 |
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172 |
TInt count=0; |
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173 |
TInt16 dither=0; |
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174 |
|
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175 |
//EColor16M image is needed |
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176 |
if (aImage.DisplayMode() != EColor16M || aImage.DisplayMode() != EColor16M) |
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177 |
return; |
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178 |
|
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179 |
// Line Buffer and pointer to the data |
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180 |
TUint imageWidth = aImage.SizeInPixels().iWidth; |
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181 |
TUint scanLineLengthInBytes = aImage.ScanLineLength(imageWidth, aImage.DisplayMode()); |
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182 |
|
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183 |
//Allocate buffer for scanline |
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184 |
iScanLineBuffer = HBufC8::NewMaxL(scanLineLengthInBytes); |
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185 |
//Pointer to scanline |
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186 |
TPtr8 linePtr = iScanLineBuffer->Des(); |
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187 |
|
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188 |
//Step through image lines |
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189 |
for (TInt lineNo=0; lineNo<aImage.SizeInPixels().iHeight; ++lineNo) |
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190 |
{ |
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191 |
//Get line |
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192 |
aImage.GetScanLine(linePtr, TPoint(0, lineNo), imageWidth, aImage.DisplayMode()); |
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193 |
//CHECK! CONST_CAST not used in every algorithm which way is better? |
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194 |
dataPtr = CONST_CAST(TUint8*, linePtr.Ptr()); |
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195 |
|
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196 |
//Step through image pixels |
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Committing the Video Editor package under the Eclipse Public License
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197 |
for (TUint x=0; x < imageWidth; ++x) |
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198 |
{ |
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199 |
// Get original values |
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200 |
b = *dataPtr++; |
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201 |
g = *dataPtr++; |
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202 |
r = *dataPtr++; |
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203 |
|
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204 |
//Compute DCDithering factor from base count |
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205 |
switch (count&1) |
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Committing the Video Editor package under the Eclipse Public License
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206 |
{ |
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207 |
case 0: |
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208 |
dither = (TInt16)(dither*0x7ffd); |
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209 |
break; |
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210 |
case 1: |
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211 |
dither = (TInt16)(dither+0x7f21); |
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212 |
break; |
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Committing the Video Editor package under the Eclipse Public License
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213 |
} |
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214 |
|
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215 |
//Add DCDithering factor, adjust gain according to quantization factors. |
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216 |
r = Limit255((TInt)r + (dither>>13)); |
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217 |
g = Limit255((TInt)g - (dither>>14)); |
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218 |
b = Limit255((TInt)b + (dither>>13)); |
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219 |
|
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220 |
//Move to the previous pixel |
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Committing the Video Editor package under the Eclipse Public License
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221 |
dataPtr -= 3; |
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222 |
|
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223 |
/* Set the result */ |
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224 |
*dataPtr++ = (TUint8)b; |
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225 |
*dataPtr++ = (TUint8)g; |
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226 |
*dataPtr++ = (TUint8)r; |
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227 |
|
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228 |
//Increase bae count |
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229 |
count++; |
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230 |
} |
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|
231 |
|
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232 |
//Set scan line |
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Committing the Video Editor package under the Eclipse Public License
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233 |
aImage.SetScanLine(linePtr, lineNo); |
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234 |
} |
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235 |
|
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236 |
//Free allocated memory |
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237 |
delete(iScanLineBuffer); |
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Committing the Video Editor package under the Eclipse Public License
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238 |
iScanLineBuffer = 0; |
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Committing the Video Editor package under the Eclipse Public License
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239 |
} |
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Committing the Video Editor package under the Eclipse Public License
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240 |
// End of File |
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Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
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