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NAME
HQCMD_CLIPSCREENBLOCK — copies image data from a
screen to a previously allocated ImageBlock with clipping
FUNCTION
Copies a rectangle of image data from a source screen located in
display memory to a previously allocated ImageBlock structure
with the image data memory allocated. Clipping will take place
should the source image data not fit totally within the
ImageBlock area. The ImageBlock.Flags will be considered
when the copy is performed, thus allowing simple packing of
the image data or seperation of the RGB values to take place in
Amiga main memory.
INPUTS
io_Message
mn_ReplyPort initialised
io_Device
set by OpenDevice
io_Unit set by OpenDevice
io_Screen
set by HQCMD_OPENSCREEN
io_Command HQCMD_CLIPSCREENBLOCK
io_Data destination ImageBlock pointer
io_DestX
destination ImageBlock start x
io_DestY
destination ImageBlock start y
io_SourceX
source screen start x
io_SourceY
source screen start y
io_SizeX
block width
io_SizeY
block height
RESULT
io_Error
-ve if completely off screen
0 if completely on screen
+ve if clipping look place
BUGS
SEE ALSO
HQCMD_CLIPBLOCKSCREEN,
HQCMD_CLIPSCREENSCREEN
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