=> R1 = font handle, or pointer to identifier
R2 = x points * 16
R3 = y points * 16
R4 = x dpi
R5 = y dpi
R6 = flags
This SWI creates a bitmap file stored in the font's directory, speeding up caching, especially for subpixel positioning.
See PRM 3, page 466.
Font_MakeBitmap flags
Bit Meaning if set
0 1 = f9999x9999 (4 bpp), 0 = b9999x9999 (1 bpp)
1 perform horizontal subpixel positioning.
2 perform vertical subpixel positioning.
3 delete old file (do not replace)
4-31 0 (reserved)
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