=> R1 = redraw block, offsets looked at are:
r_bpp To find the number of bits per pixel.
r_charw Width of char in pixels
r_charh Height of char in pixels
r_caddr Address to write the bitmap. Memory at offsets
R2*r_cbpc to (R3+1)*r_bpc must be preserved
r_cbpl Cache line width in bytes (as defined under
r_caddr help text)
r_cbpc Number of bytes per cached character (as defined
under r_caddr help text)
R2 = First character to be converted (eg 0)
R3 = Last character to be converted (inclusive) (eg 255)
R4 = Address of source bitmap of the format described under r_caddr
but with 1 bit per pixel (ie 2 colour mode format)
<= R0 and flags corrupted
r_caddr block written to
This SWI takes a character bitmap of the form of 1 bit per pixel, (the bit
set for foreground/clear for background) and converts it into a bitmap for
use by the ZapRedraw_RedrawArea, by changing each '1' to n '1's and each
'0' to n '0's where 'n' is the number of bits per pixel given. It uses the
SWI ZapRedraw_ConvBitmapChar to do this.
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