Hi,
In my Panther application I display a bitmap (.PNG) in a UserPane.
Depending on the settings in my app I show different bitmaps. The bitmaps
have a transparent background but the bitmaps themselves differ in size
(just the picture part, not the rectangle).
When switching to Tiger I got warnings from the compiler that QuickDraw
functions I used are deprecated.
I struggled through some documentation and made some changes. This is the
result:
Rect rect;
GetControlBounds(pane,&rect);
CGRect cgrect;
cgrect = ConvertRectToCGRect(rect, port);
// clear previous image
//EraseRect(&rect); // old
result = QDBeginCGContext(port, &context);
CGContextClearRect(context, cgrect); // new
// draw the image
CGContextDrawImage(context,cgrect,image);
// flush the gfx --> update
CGContextFlush(context);
// end CG drawing
result = QDEndCGContext(port, &context);
When I run this the picturepart show up nicely however the background is
pitch black!
In the QuickDraw solution I used EraseRect to clear the background (now
commented out) and I replaced it with it's Quartz counter part
CGContextClearRect. With the described result. How can I get back my
window's normal background instead of just black?
Regards,
Hans Loonen
PS in the documentation of EraseRect it says: "Using the patCopy pattern
....". Is there a Quartz equivalent for that?
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