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framebuf_subclass.py

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# test subclassing framebuf.FrameBuffer

try:

import framebuf, usys

except ImportError:

print("SKIP")

raise SystemExit

# This test and its .exp file is based on a little-endian architecture.

if usys.byteorder != "little":

print("SKIP")

raise SystemExit

class FB(framebuf.FrameBuffer):

def __init__(self, n):

self.n = n

super().__init__(bytearray(2 * n * n), n, n, framebuf.RGB565)

def foo(self):

self.hline(0, 2, self.n, 0x0304)

fb = FB(n=3)

fb.pixel(0, 0, 0x0102)

fb.foo()

print(bytes(fb))

# Test that blitting a subclass works.

fb2 = framebuf.FrameBuffer(bytearray(2 * 3 * 3), 3, 3, framebuf.RGB565)

fb.fill(0)

fb.pixel(0, 0, 0x0506)

fb.pixel(2, 2, 0x0708)

fb2.blit(fb, 0, 0)

print(bytes(fb2))

# Test that blitting something that isn't a subclass fails with TypeError.

class NotAFrameBuf:

pass

try:

fb.blit(NotAFrameBuf(), 0, 0)

except TypeError:

print("TypeError")

try:

fb.blit(None, 0, 0)

except TypeError:

print("TypeError")