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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.width = width
self.height = height self.height = height
self.linebuffer = memoryview(bytearray(2 * width)) self.linebuffer = memoryview(bytearray(2 * width))
self.window = bytearray(4)
self.init_display() self.init_display()
def init_display(self): def init_display(self):
@ -106,7 +107,7 @@ class ST7789(object):
self.write_cmd(_DISPON) self.write_cmd(_DISPON)
@micropython.native @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. """Set the clipping rectangle.
All writes to the display will be wrapped at the edges of the 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 :param h: Height of the rectangle, defaults to None (which means select
the bottom-most pixel of the display) the bottom-most pixel of the display)
""" """
if not width: write_cmd = self.write_cmd
width = self.width window = self.window
if not height: write_data = self.write_data
height = self.height
xp = x + width - 1 xp = x + width - 1
yp = y + height - 1 yp = y + height - 1
self.write_cmd(_CASET) write_cmd(_CASET)
self.write_data(bytearray([x >> 8, x & 0xff, xp >> 8, xp & 0xff])) window[0] = x >> 8
self.write_cmd(_RASET) window[1] = x & 0xff
self.write_data(bytearray([y >> 8, y & 0xff, yp >> 8, yp & 0xff])) window[2] = xp >> 8
self.write_cmd(_RAMWR) 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): def rawblit(self, buf, x, y, width, height):
"""Blit raw pixels to the display. """Blit raw pixels to the display.