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Include
GuruMeditation
Docs » Autodocs » graphics.library » ScrollRaster

NAME

   ScrollRaster -- Push bits in rectangle in raster around by
dx,dy towards 0,0 inside rectangle.

SYNOPSIS

   ScrollRaster(rp, dx, dy, xmin, ymin, xmax, ymax)
A1 D0 D1 D2 D3 D4 D5
void ScrollRaster
(struct RastPort *, WORD, WORD, WORD, WORD, WORD, WORD);

FUNCTION

   Move the bits in the raster by (dx,dy) towards (0,0)
The space vacated is RectFilled with BGPen.
Limit the scroll operation to the rectangle defined
by (xmin,ymin)(xmax,ymax). Bits outside will not be
affected. If xmax,ymax is outside the rastport then use
the lower right corner of the rastport.
If you are dealing with a SimpleRefresh layered RastPort you
should check rp->Layer->Flags & LAYERREFRESH to see if
there is any damage in the damage list. If there is you should
call the appropriate BeginRefresh(Intuition) or BeginUpdate(graphics)
routine sequence.

INPUTS

   rp - pointer to a RastPort structure
dx,dy are integers that may be positive, zero, or negative
xmin,ymin - upper left of bounding rectangle
xmax,ymax - lower right of bounding rectangle

EXAMPLE

   ScrollRaster(rp,0,1,minx,miny,maxx,maxy) /* shift raster up by one row */
ScrollRaster(rp,-1,-1,minx,miny,maxx,maxy)
/* shift raster down and to the right by 1 pixel

BUGS

   In 1.2/V1.3 if you ScrollRaster a SUPERBITMAP exactly left or 
right, and there is no TmpRas attached to the RastPort, the system
will allocate one for you, but will never free it or record its
location. This bug has been fixed for V36. The workaround for
1.2/1.3 is to attach a valid TmpRas of size at least
MAXBYTESPERROW to the RastPort before the call.
Beginning with V36 ScrollRaster adds the shifted areas into the
damage list for SIMPLE_REFRESH windows. Due to unacceptable
system overhead, the decision was made NOT to propagate this
shifted area damage for SMART_REFRESH windows.

SEE ALSO

ScrollRasterBF(), <graphics/rastport.h>

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