《Focus On 3D Terrain Programming》中一段代码的注释三

 1 //--------------------------------------------------------------
 2 // Name:          CIMAGE::LoadUncompressedTGA - private
 3 // Description:   Load an uncompressed targa (TGA)
 4 // Arguments:     None
 5 // Return Value:  A boolean variable: -true: TGA was loaded
 6 //                                    -false: TGA was not loaded
 7 //--------------------------------------------------------------
 8 bool CIMAGE::LoadUncompressedTGA( void )
 9 {
10   ........
11   ....
12   pTGAinfo.m_uiBytesPerPixel= m_uiBPP/8;
13   pTGAinfo.m_uiImageSize    = ( pTGAinfo.m_uiBytesPerPixel*m_uiWidth*m_uiHeight );
14 
15   //copy the image data
16   memcpy( m_ucpData, ucpFile, pTGAinfo.m_uiImageSize );
17 
18   //byte swapping ( optimized by Steve Thomas )
19   for( uiCSwap=0; uiCSwap<( int )pTGAinfo.m_uiImageSize; uiCSwap+=pTGAinfo.m_uiBytesPerPixel )
20   {
21     m_ucpData[uiCSwap]^= m_ucpData[uiCSwap+2]^=m_ucpData[uiCSwap]^= m_ucpData[uiCSwap+2];
22   }
23 
24   //the uncompressed TGA has been successfully loaded
25   return true;
26 }