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draw565: Optimize string drawing

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Avoid needless bouncing the chip select when drawing glyphs. This
improved performance by around 15% for 24pt fonts.

Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
This commit is contained in:
Daniel Thompson 2021-01-17 16:03:42 +00:00
parent 5170b97491
commit 2fe3ac1388
1 changed files with 5 additions and 1 deletions
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6
wasp/draw565.py
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@ -91,9 +91,13 @@ def _draw_glyph(display, glyph, x, y, bgfg):
bytes_per_row = (w + 7) // 8 bytes_per_row = (w + 7) // 8
display.set_window(x, y, w+1, h) display.set_window(x, y, w+1, h)
quick_write = display.quick_write
display.quick_start()
for row in range(h): for row in range(h):
_bitblit(buf, px[row*bytes_per_row:], bgfg, w) _bitblit(buf, px[row*bytes_per_row:], bgfg, w)
display.write_data(buf) quick_write(buf)
display.quick_end()
class Draw565(object): class Draw565(object):
"""Drawing library for RGB565 displays. """Drawing library for RGB565 displays.