55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
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import config
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import threading
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import numpy
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from ctypes import *
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class COLOR(Structure):
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_fields_ = [('r', c_uint8), ('g', c_uint8), ('b', c_uint8), ('a', c_uint8)]
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class FRAMEBUFFER(Structure):
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_fields_ = [('data', POINTER(COLOR)), ('w', c_size_t), ('h', c_size_t)]
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lib = CDLL('./libbdf.so')
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lib.read_bdf_file.restype = c_void_p
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lib.framebuffer_render_text.restype = POINTER(FRAMEBUFFER)
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lib.framebuffer_render_text.argtypes= [c_char_p, c_void_p, c_void_p, c_size_t, c_size_t, c_size_t]
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dbuf = numpy.zeros(config.frame_size*4, dtype=numpy.uint8)
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printlock = threading.Lock()
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def printframe(fb):
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with printlock:
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print('\0337\033[H')
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rgba = len(fb) == config.frame_size*4
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ip = numpy.frombuffer(fb, dtype=numpy.uint8)
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numpy.copyto(dbuf[0::4], ip[0::3+rgba])
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numpy.copyto(dbuf[1::4], ip[1::3+rgba])
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numpy.copyto(dbuf[2::4], ip[2::3+rgba])
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lib.console_render_buffer(dbuf.ctypes.data_as(POINTER(c_uint8)), config.display_width, config.display_height)
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class Font:
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def __init__(self, fontfile='unifont.bdf'):
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self.font = lib.read_bdf_file(fontfile)
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assert self.font
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# hack to prevent unlocalized memory leak arising from ctypes/numpy/cpython interaction
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self.cbuf = create_string_buffer(config.frame_size*sizeof(COLOR))
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self.cbuflock = threading.Lock()
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def compute_text_bounds(self, text):
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textbytes = text.encode()
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textw, texth = c_size_t(0), c_size_t(0)
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res = lib.framebuffer_get_text_bounds(textbytes, self.font, byref(textw), byref(texth))
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if res:
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raise RuntimeError('Invalid text')
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return textw.value, texth.value
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def render_text(self, text, offset):
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with self.cbuflock:
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textbytes = bytes(str(text), 'UTF-8')
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res = lib.framebuffer_render_text(textbytes, self.font, self.cbuf,
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config.display_width, config.display_height, offset)
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if res:
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raise RuntimeError('Invalid text')
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return self.cbuf
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unifont = Font()
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