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drivers: st7789: Further reduce allocations during set_window()

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Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
This commit is contained in:
Daniel Thompson 2021-01-17 17:44:50 +00:00
parent 6b41c8f3db
commit fbc806721e
1 changed files with 20 additions and 10 deletions
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30
wasp/drivers/st7789.py
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@ -45,6 +45,7 @@ class ST7789(object):
self.width = width
self.height = height
self.linebuffer = memoryview(bytearray(2 * width))
self.window = bytearray(4)
self.init_display()
def init_display(self):
@ -106,7 +107,7 @@ class ST7789(object):
self.write_cmd(_DISPON)
@micropython.native
def set_window(self, x=0, y=0, width=None, height=None):
def set_window(self, x, y, width, height):
"""Set the clipping rectangle.
All writes to the display will be wrapped at the edges of the rectangle.
@ -118,19 +119,28 @@ class ST7789(object):
:param h: Height of the rectangle, defaults to None (which means select
the bottom-most pixel of the display)
"""
if not width:
width = self.width
if not height:
height = self.height
write_cmd = self.write_cmd
window = self.window
write_data = self.write_data
xp = x + width - 1
yp = y + height - 1
self.write_cmd(_CASET)
self.write_data(bytearray([x >> 8, x & 0xff, xp >> 8, xp & 0xff]))
self.write_cmd(_RASET)
self.write_data(bytearray([y >> 8, y & 0xff, yp >> 8, yp & 0xff]))
self.write_cmd(_RAMWR)
write_cmd(_CASET)
window[0] = x >> 8
window[1] = x & 0xff
window[2] = xp >> 8
window[3] = xp & 0xff
write_data(window)
write_cmd(_RASET)
window[0] = y >> 8
window[1] = y & 0xff
window[2] = yp >> 8
window[3] = yp & 0xff
write_data(window)
write_cmd(_RAMWR)
def rawblit(self, buf, x, y, width, height):
"""Blit raw pixels to the display.