Manual Inspecta Software

2.4.5.12 linadrs3 ()
Software
example: mapping a 512x512 pixel window 1024x1024 display
makes:
width=height=1024; multx=multy=2; pitch=512
destination: ram=1:VRAM; 2:OVLY
Description: linadrs3 enables the direct access to video RAM of the S3 VGA controller.
linadrs3 () maps the physical video RAM address to the actual data-segment and
provides a linear address to have access to it.
linadrs3() must be called before using mvfg_dmawin.
2.4.5.13 mvfg_dmawin (x, y, width, height, pointer, pitch, color)
Description: mvfg_dmawin write video data direct to the RAM of the S3-VGA controller. It is
the fastest way of writing images to screen.
The direct access of the VGA RAM must be opened by a previously called
linadrs3 (). Overlays are destroyed.
Parameters: x, y: UL corner of window in graphics display memory
width: width of window [pixel] in dest device
height: height of window [lines] in dest device
ptr: UL corner of CPU image memory window to transfer
pitch: ptr memory address offset between lines
color=0 -> 8-Bit grey scale
color=1 -> 3/3/2 r/g/b color mode,
ptr to other color planes is ptr+[pel_frm]
color=2 -> r/g/b 24 bit color mode
ptr to other color planes is ptr+[pel_frm]
color=3 -> r=g=b grey mode
INSPECTA Software Rev. 1.47 Page 54