=> R0 = pointer to path block
R1 = fill style, or 0 for default
bit 31 clear to stroke each subpath in turn (can result in pixels being plotted twice)
R2 = pointer to transformation matrix, or 0 for identity
R3 = flatness, or 0 for default
R4 = line thickness, or 0 for default
R5 = pointer to join/cap block, or 0 if none
R6 = pointer to dashing pattern, or 0 if none
R7 = pointer to clip description block.
<= R0 corrupt
This SWI is used to draw a path.
If thickness is zero, fill bits 3,2 must not be 01
If thickness is non-zero, fill bits 2-5 must not be 0110 - i.e. filling just the boundary pixels.
Draw_Stroke default fill style
0 gives the default fill style which depends on R4 (line thickness):
R4 value Default fill style
0 &30 - fill to boundary centre, non-zero rule.
other &18 - fill only the boundary
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