=> R0 = flags
R1 = pointer to drawfile block
R2 = length of block
R3 = pointer to transformation matrix, or 0 to use identity matrix
R4 = pointer to clipping rectangle in OS units, or 0 for none
R5 = flatness if bit 2 of R0 set
<= All preserved
This SWI renders a draw file at a given screen position where that position is defined as screen position 0, 0 with the x- and y-translations as specified in the transformation matrix. Hence, to render a non-rotated 1:1 draw file at (x, y) (screen coordinates in OS units) the transformation matrix is :
( 1 << 16 0 )
( 0 1 << 16 )
( 256*x 256*y )
The clipping rectangle is typically a redraw rectangle returned by the Wimp on a redraw window request. If R4 = 0, then the whole draw file is rendered. If non-zero, only objects which intersect the clipping rectangle are rendered.
DrawFile_Render flags
Bit Meaning if set
0 render bounding boxes (as dotted red rectangles)
1 do not render the objects themselves
2 use R5 as flatness
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