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ScrRectScroll |
Function (ROM Call 0x18B) |
Scrols a rectangular area upwards or downwards.
ScrRectScroll scrolls a rectangular area which is an intersection of two
rectangular areas given using two SCR_RECT structures
rect and clip upwards by NumRows pixels (or downwards
if NumRows < 0). rect usually represents the actual
area which need to be scrolled, and clip is the clipping area.
See SetCurClip for more info about clipping areas.
The attribute Attr determines what happens
with pixels in a vacant space produced after scrolling:
A_NORMAL | Pixels in a vacant space are set |
A_REVERSE | Pixels in a vacant space are reset |
A_XOR | Pixels in a vacant space are inverted |
See SetCurAttr command for more general info about attributes.
Note: This command is internally realized stupidly using
BitmapGet and BitmapPut,
so it is slow.
Uses: BitmapGet, BitmapPut, ScrRectFill, memcmp, memcpy, TIOS_abs
Used by: fputchar, WinChar, WinScrollV