b15348415e
Currently the `FrameBuffer.blit(buf, x, y)` method requires the `buf`
argument to be another `FrameBuffer`, which is quite restrictive because it
doesn't allow blit'ing read-only memory/data.
This commit extends `blit()` to allow the `buf` argument to be a tuple or
list of the form:
(buffer, width, height, format[, stride])
where `buffer` can be anything with the buffer protocol and may be
read-only, eg `bytes`.
Also, the palette argument to `blit()` may be of the same form.
The form of this tuple/list was chosen to be the same as the signature of
the `FrameBuffer` constructor (that saves quite a bit of code size doing it
that way).
Signed-off-by: Damien George <damien@micropython.org>
68 lines
1.4 KiB
Python
68 lines
1.4 KiB
Python
# Test FrameBuffer.blit method.
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try:
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import framebuf
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except ImportError:
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print("SKIP")
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raise SystemExit
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def printbuf():
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print("--8<--")
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for y in range(h):
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for x in range(w):
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print("%02x" % buf[(x + y * w)], end="")
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print()
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print("-->8--")
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w = 5
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h = 4
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buf = bytearray(w * h)
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fbuf = framebuf.FrameBuffer(buf, w, h, framebuf.GS8)
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fbuf2 = framebuf.FrameBuffer(bytearray(4), 2, 2, framebuf.GS8)
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fbuf2.fill(0xFF)
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# Blit another FrameBuffer, at various locations.
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for x, y in ((-1, -1), (0, 0), (1, 1), (4, 3)):
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fbuf.fill(0)
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fbuf.blit(fbuf2, x, y)
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printbuf()
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# Blit a bytes object.
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fbuf.fill(0)
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image = (b"\x10\x11\x12\x13", 2, 2, framebuf.GS8)
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fbuf.blit(image, 1, 1)
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printbuf()
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# Blit a bytes object that has a stride.
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fbuf.fill(0)
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image = (b"\x20\x21\xff\x22\x23\xff", 2, 2, framebuf.GS8, 3)
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fbuf.blit(image, 1, 1)
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printbuf()
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# Blit a bytes object with a bytes palette.
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fbuf.fill(0)
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image = (b"\x00\x01\x01\x00", 2, 2, framebuf.GS8)
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palette = (b"\xa1\xa2", 2, 1, framebuf.GS8)
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fbuf.blit(image, 1, 1, -1, palette)
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printbuf()
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# Not enough elements in the tuple.
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try:
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fbuf.blit((0, 0, 0), 0, 0)
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except ValueError:
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print("ValueError")
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# Too many elements in the tuple.
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try:
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fbuf.blit((0, 0, 0, 0, 0, 0), 0, 0)
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except ValueError:
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print("ValueError")
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# Bytes too small.
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try:
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fbuf.blit((b"", 1, 1, framebuf.GS8), 0, 0)
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except ValueError:
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print("ValueError")
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