symbian 半透明效果

转自：http://www.devdiv.net/thread-10592-1-2.html

void CMegajoyContainer::ConvertToAlpha(CWindowGc& gc,CFbsBitmap *imgToBrighten) const
{
  CFbsBitmap* iEmptyBitmap = new ( ELeave ) CFbsBitmap();
  CleanupStack::PushL( iEmptyBitmap );
  User::LeaveIfError( iEmptyBitmap->Create( imgToBrighten->SizeInPixels(), CEikonEnv::Static()->DefaultDisplayMode() ) );
  CFbsBitmapDevice *iGD = CFbsBitmapDevice::NewL( iEmptyBitmap );
  CleanupStack::PushL( iGD );
  CFbsBitGc *iGC;
  User::LeaveIfError( iGD->CreateContext( iGC ) );
  iGC->SetPenStyle( CGraphicsContext::ENullPen );
  iGC->SetBrushColor( KRgbWhite );
  iGC->SetBrushStyle( CGraphicsContext::ESolidBrush );
  iGC->DrawRect( TRect(TPoint(0,0), iEmptyBitmap->SizeInPixels()) );
  iGC->SetBrushStyle( CGraphicsContext::ENullBrush );
  delete iGC;
  CleanupStack::PopAndDestroy( iGD );
  CFbsBitmap* iEmptyBitmapMask = new ( ELeave ) CFbsBitmap();
  CleanupStack::PushL( iEmptyBitmapMask );
  User::LeaveIfError( iEmptyBitmapMask->Create( imgToBrighten->SizeInPixels(), EGray256 ) );
  iGD = CFbsBitmapDevice::NewL( iEmptyBitmapMask );
  CleanupStack::PushL( iGD );
  User::LeaveIfError( iGD->CreateContext( iGC ) );
  iGC->SetPenStyle( CGraphicsContext::ENullPen );
  iGC->SetBrushColor( KRgbGray );
  iGC->SetBrushStyle( CGraphicsContext::ESolidBrush );
  iGC->DrawRect( TRect(TPoint(0,0), iEmptyBitmap->SizeInPixels()) );
  iGC->SetBrushStyle( CGraphicsContext::ENullBrush );
  delete iGC;
  CleanupStack::PopAndDestroy( iGD );
  gc.BitBltMasked(TPoint(0,0),iEmptyBitmap,TRect(TPoint(0,0),iEmptyBitmapMask->SizeInPixels()),iEmptyBitmapMask,EFalse);
  CleanupStack::PopAndDestroy(iEmptyBitmapMask);
  CleanupStack::PopAndDestroy( iEmptyBitmap );
} 
注意要在.mmp文件中加入库文件
LIBRARY bitgdi.lib 
LIBRARY ws32.lib 
LIBRARY fbscli.lib

效果图：

1.jpg (11.71 KB)