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draw565: Optimize the font rendering

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This is a big one... more than 4x increase in font rendering performance!
This commit is contained in:
Daniel Thompson 2020-03-09 21:29:35 +00:00
parent 031d139b7c
commit 69bc452c65
1 changed files with 5 additions and 3 deletions
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8
wasp/draw565.py
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@ -47,17 +47,19 @@ def _bounding_box(s, font):
return (w, h)
@micropython.native
def _draw_glyph(display, glyph, x, y, bgfg):
(px, h, w) = glyph
buf = memoryview(display.linebuffer)[0:2*(w+1)]
buf[2*w] = 0
buf[2*w + 1] = 0
bytes_per_row = (w + 7) // 8
display.set_window(x, y, w+1, h)
for row in range(h):
_bitblit(buf, px[row*bytes_per_row:], bgfg, w)
buf[2*w] = 0
buf[2*w + 1] = 0
display.rawblit(buf, x, y+row, w+1, 1)
display.write_data(buf)
class Draw565(object):
"""Drawing library for RGB565 displays.