def __init__(self, device=None, framebuffer=None, bgr=False, **kwargs):
super(linux_framebuffer, self).__init__(serial_interface=noop())
self.id = self.__get_display_id(device)
(width, height) = self.__config("virtual_size")
self.bits_per_pixel = next(self.__config("bits_per_pixel"))
# Lookup table of (target bit-depth, bgr) -> function, where the
# function takes an RGB image and converts it into a stream of
# bytes for the target bit-depth and RGB/BGR orientation.
image_converters = {
(16, False): self.__toRGB565,
(24, False): self.__toRGB,
(24, True): self.__toBGR,
(32, False): self.__toRGBA,
(32, True): self.__toBGRA,
}
assert (
self.bits_per_pixel, bgr
) in image_converters, f"Unsupported bit-depth: {self.bits_per_pixel}"
self.__image_converter = image_converters[(self.bits_per_pixel, bgr)]
self.framebuffer = framebuffer or diff_to_previous(num_segments=16)
self.capabilities(width, height, rotate=0, mode="RGB")
# This file handle is closed in self.cleanup() (usually invoked
# automatically via a registered `atexit` hook)
self.__file_handle = open(f"/dev/fb{self.id}", "wb")
def test_custom_full():
"""
Auto-create feature runs out of custom character space
"""
device = hd44780(interface,
bitmode=8,
gpio=gpio,
framebuffer=diff_to_previous(num_segments=1))
# Consume 8 special character positions
img = Image.new('1', (80, 16), 0)
drw = ImageDraw.Draw(img)
for i in range(8):
drw.rectangle((i * 5, 0, (i + 1) * 5, i),
fill='white',
outline='white')
device.display(img)
interface.reset_mock()
# Consume one more (on the last char position on screen)
drw.line((75, 8, 79, 15), fill='white')
device.display(img)
interface.assert_has_calls([
call.command(0x40),
call.data([0x10, 0x08, 0x08, 0x04, 0x04, 0x02, 0x02, 0x01]),
call.command(0xcf),
call.data([0x0])
])
def test_diff_to_previous():
framebuffer = diff_to_previous(num_segments=4)
redraws = list(framebuffer.redraw(im1))
# First redraw should be the full image
assert len(redraws) == 1
assert redraws[0][0] == im1
assert redraws[0][1] == im1.getbbox()
assert redraws[0][1] is not None
# Redraw of same image should return empty changeset
redraws = list(framebuffer.redraw(im1))
assert len(redraws) == 0
# Redraw of new image should return two changesets
redraws = list(framebuffer.redraw(im2))
assert len(redraws) == 2
assert redraws[0][0] == im2.crop((0, 20, 20, 40))
assert redraws[0][1] == (20, 0, 40, 20)
assert redraws[1][0] == im2.crop((20, 0, 40, 20))
assert redraws[1][1] == (0, 20, 20, 40)
# Redraw of original image should return two changesets
redraws = list(framebuffer.redraw(im1))
assert len(redraws) == 2
assert redraws[0][0] == im1.crop((20, 0, 40, 20))
assert redraws[0][1] == (20, 0, 40, 20)
assert redraws[1][0] == im1.crop((0, 20, 20, 40))
assert redraws[1][1] == (0, 20, 20, 40)
def test_diff_to_previous():
framebuffer = diff_to_previous(device)
assert framebuffer.redraw_required(im1)
pix1 = list(framebuffer.getdata())
assert len(pix1) == 12
assert pix1 == [0x00] * 12
assert framebuffer.bounding_box == (0, 1, 4, 4)
assert framebuffer.inflate_bbox() == (0, 1, 4, 4)
assert framebuffer.redraw_required(im2)
pix2 = list(framebuffer.getdata())
assert len(pix2) == 3
assert pix2 == [0xFF] * 3
assert framebuffer.bounding_box == (0, 1, 1, 4)
assert framebuffer.inflate_bbox() == (0, 1, 4, 4)
assert not framebuffer.redraw_required(im2)
assert framebuffer.getdata() is None
assert framebuffer.bounding_box is None
def test_diff_to_previous_debug():
framebuffer = diff_to_previous(num_segments=4, debug=True)
redraws = list(framebuffer.redraw(im1))
# First redraw should be the full image unchanged
assert len(redraws) == 1
assert redraws[0][0] == im1
# Redraw of new image should return two changesets with red borders around them
redraws = list(framebuffer.redraw(im2))
assert len(redraws) == 2
first_changeset_image = im2.copy().crop((20, 0, 40, 20))
draw = ImageDraw.Draw(first_changeset_image)
draw.rectangle((0, 0, 19, 19), outline="red")
del draw
assert redraws[0][0] == first_changeset_image
second_changeset_image = im2.copy().crop((0, 20, 20, 40))
draw = ImageDraw.Draw(second_changeset_image)
draw.rectangle((0, 0, 19, 19), outline="red")
del draw
assert redraws[1][0] == second_changeset_image
def test_framebuffer_override():
"""
Reproduce https://github.com/rm-hull/luma.examples/issues/95
"""
ssd1327(serial, mode="1", framebuffer=diff_to_previous())