在S60加载Bitmap和Mask的效率

From Forum Nokia Wiki

_LIT(KYourMifFile, “resource//apps//yourmif.mif”);

//yourmif.mif contains svgs

include <yourmif.mbg>  in  .cpp file

// In header file

CFbsBitmap* iFocusBitmap;
CFbsBitmap* iBitmapMask;

// anywhere in .cpp file

if(iFocusBitmap == NULL)
{         
   // load the image and mask
   AknIconUtils::CreateIconL( iFocusBitmap,
                              iBitmapMask,
                              KYourMifFile, 
                              EMbmYourMif_focus,
                              EMbmYourMif_mask );
}
TSize  size(Rect().Width()*10/100,Rect().Height()*10/100); 
AknIconUtils::SetSize(iFocusBitmap,size,EAspectRatioNotPreserved);
AknIconUtils::SetSize(iBitmapMask,size,EAspectRatioNotPreserved );

// In the destructor

delete  iFocusBitmap;
delete  iBitmapMask;

AknIconUtils::SetSize初始化给定尺寸的图标，参数aBitmap是CAknBitmap的示例，如AknIconUtils方式生成。如果不是CAknBitmap,这个方法无效。注意这里调用设置的是bitmap和mask(如果它存在的话)，如果不调用SetSize方法，那么位图将无法被绘制到屏幕上。

尽管CreateIconL有重载方法只加载单个图片，但上述方法在加载和修改尺寸方面更有效率。