SwapBitsRastPortClipRect
I just added the fabulous SwapBitsRastPortClipRect() function to my nearly
complete menuing program. The above function expects to receive a RastPort
pointer and a ClipRect pointer. It does not seem to work quite right yet.
Here is what I am doing: I want to render a small submenu at 'x,y' in screen
's'. The submenu is drawn in bitmap 'b'. I will implement a ClipRect 'cr' to
call the function.
Given that, this is what I am calling SwapBits…() with: (hybrid C code, I use
Modula-2)
cr->BitMap=b;
cr->Bounds.MinX=x; cr->Bounds.MinY=x;
cr->Bounds.MaxX=x+width; cr->Bounds.MaxY=y+height;
cr->BitMap=b;
…
all other cr-> fields are NULL;
…
Then…. SwapBits…(&s->RPort,cr);
The menu bitmap renders in the correct x,y position, but the image is
offset some in the rectangle bounds I specified above.
This offsetting causes a crash, of course.
Where am I going wrong? Advice is most appreciated.
Tim