How to shift pixels of a pixmap efficient in Qt4
- by stanleyxu2005
Hello,
I have implemented a marquee text widget using Qt4. I painted the text content onto a pixmap first. And then paint a portion of this pixmap onto a paint device by calling painter.drawTiledPixmap(offsetX, offsetY, myPixmap)
My Imagination is that, Qt will fill the whole marquee text rectangle with the content from myPixmap.
Is there a ever faster way, to shift all existing content to left by 1px and than fill the newly exposed 1px wide and N-px high area with the content from myPixmap?