Host: Add console CRAP client

host/bdf.py

@@ -0,0 +1,56 @@
+
+import config
+import threading
+import numpy
+from ctypes import *
+
+class COLOR(Structure):
+		_fields_ = [('r', c_uint8), ('g', c_uint8), ('b', c_uint8), ('a', c_uint8)]
+
+class FRAMEBUFFER(Structure):
+		_fields_ = [('data', POINTER(COLOR)), ('w', c_size_t), ('h', c_size_t)]
+
+lib = CDLL('./libbdf.so')
+lib.read_bdf_file.restype = c_void_p
+lib.framebuffer_render_text.restype = POINTER(FRAMEBUFFER)
+lib.framebuffer_render_text.argtypes= [c_char_p, c_void_p, c_void_p, c_size_t, c_size_t, c_size_t]
+
+dbuf = numpy.zeros(config.frame_size*4, dtype=numpy.uint8)
+printlock = threading.Lock()
+def printframe(fb):
+	with printlock:
+		print('\0337\033[H')
+		rgba = len(fb) == config.frame_size*4
+		ip = numpy.frombuffer(fb, dtype=numpy.uint8)
+		numpy.copyto(dbuf[0::4], ip[0::3+rgba])
+		numpy.copyto(dbuf[1::4], ip[1::3+rgba])
+		numpy.copyto(dbuf[2::4], ip[2::3+rgba])
+		lib.console_render_buffer(dbuf.ctypes.data_as(POINTER(c_uint8)), config.display_width, config.display_height)
+
+
+class Font:
+	def __init__(self, fontfile='unifont.bdf'):
+		self.font = lib.read_bdf_file(fontfile)
+		assert self.font
+		# hack to prevent unlocalized memory leak arising from ctypes/numpy/cpython interaction
+		self.cbuf = create_string_buffer(config.frame_size*sizeof(COLOR))
+		self.cbuflock = threading.Lock()
+
+	def compute_text_bounds(text):
+		textbytes = text.encode()
+		textw, texth = c_size_t(0), c_size_t(0)
+		res = lib.framebuffer_get_text_bounds(textbytes, unifont, byref(textw), byref(texth))
+		if res:
+			raise ValueError('Invalid text')
+		return textw.value, texth.value
+
+	def render_text(text, offset):
+		with cbuflock:
+			textbytes = bytes(str(text), 'UTF-8')
+			res = lib.framebuffer_render_text(textbytes, self.font, self.cbuf,
+					config.display_width, config.display_height, offset)
+			if res:
+				raise ValueError('Invalid text')
+			return self.cbuf
+
+