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draw565: Optimize filled rectangle drawing

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The original approach is *really* bad at drawing vertical lines (it ends
up working a pixel at a time and works the chip select for each one.

Optimize both the pixel fill and the use of the line buffer. The result
is 20% faster for quarter screen fills, 3x for horizontal lines and 6x
for vertical lines.

Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
This commit is contained in:
Daniel Thompson 2020-06-22 22:20:34 +01:00
parent d81e8e75ac
commit 04a8daeff4
1 changed files with 24 additions and 1 deletions
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25
wasp/draw565.py
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@ -125,9 +125,32 @@ class Draw565(object):
:param h: Height of the rectangle, defaults to None (which means select
the bottom-most pixel of the display)
"""
display = self._display
quick_write = display.quick_write
if bg is None:
bg = self._bgfg >> 16
self._display.fill(bg, x, y, w, h)
if w is None:
w = display.width - x
if h is None:
h = display.height - y
display.set_window(x, y, w, h)
remaining = w * h
# Populate the line buffer
buf = display.linebuffer
sz = len(display.linebuffer) // 2
_fill(buf, bg, min(sz, remaining), 0)
display.quick_start()
while remaining >= sz:
quick_write(buf)
remaining -= sz
if remaining:
quick_write(memoryview(display.linebuffer)[0:2*remaining])
display.quick_end()
@micropython.native
def blit(self, image, x, y, fg=0xffff, c1=0x4a69, c2=0x7bef):