Small Link Icon Resizing / 12-13-2012

• The actual icon (QPixmap) definition (on the right, see XMP source) is 20 x 15 pixels.
• In the Slot Links submenu, that is autmatically shrunken down to 16 x 12 pixels -- and looks much better.

Here is the Qt4 C++ code to transform the (20x15) icon to (16x12). This preserves the transparent pixels in the original to partially transparent pixels in the reduced-size icon (i.e. using a full "alpha channel") ...

Declarations:
   QPixmap _slotLinked15;  // (20x15) built from XPM source
   QPixmap _slotLinked12;  // (16x12) dynamically drawn, see below.
   
Initializers:
   _slotLinked15 (_slotLinked15Data), // XPM source
   _slotLinked12 (16,12),

Code:
   _slotLinked12.fill (Qt::transparent); 
   QPainter ptr1 (&_slotLinked12); 
   ptr1.setRenderHint (QPainter::SmoothPixmapTransform); 
   ptr1.drawPixmap (QRect (0,0,16,12), _slotLinked15);

Examples of these two icons, in context: