93 lines
2.1 KiB
Python
93 lines
2.1 KiB
Python
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#!/usr/bin/python
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from cairo import *
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from fcntl import ioctl
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from array import array
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import struct
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import errno
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import sys
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GIO_UNIMAP = 0x4B66
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VT_GETHIFONTMASK = 0x560D
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if len(sys.argv) != 3:
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print "Usage: %s <tty-number> <output-png>" % sys.argv[0]
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exit()
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ttyno = int(sys.argv[1])
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png = sys.argv[2]
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tty = open('/dev/tty%d' % ttyno, 'rb')
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himask = array("H", (0,))
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ioctl(tty, VT_GETHIFONTMASK, himask)
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hichar, = struct.unpack_from("@H", himask)
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sz = 512
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while True:
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try:
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unipairs = array("H", [0]*(2*sz))
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unimapdesc = array("B", struct.pack("@HP", sz, unipairs.buffer_info()[0]))
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ioctl(tty.fileno(), GIO_UNIMAP, unimapdesc)
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break
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except IOError as e:
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if e.errno != errno.ENOMEM:
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raise
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sz *= 2
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tty.close()
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ncodes, = struct.unpack_from("@H", unimapdesc)
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utable = struct.unpack_from("@%dH" % (2*ncodes), unipairs)
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charmap = {}
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for u, b in zip(utable[::2], utable[1::2]):
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if charmap.get(b) is None:
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charmap[b] = unichr(u)
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vcs = open('/dev/vcsa%d' % ttyno, 'rb')
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head = vcs.read(4)
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rows = ord(head[0])
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cols = ord(head[1])
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caretX = ord(head[2])
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caretY = ord(head[3])
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surf = ImageSurface(FORMAT_RGB24, cols * 8, rows * 16)
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cr = Context(surf)
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cr.set_source_rgb(1,1,1)
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cr.set_font_face(ToyFontFace("Mono", FONT_SLANT_NORMAL, FONT_WEIGHT_NORMAL));
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m = Matrix()
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m.scale(10.0, 12.0)
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cr.set_font_matrix(m)
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def CairoColor(b, a):
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return (b if a & 4 else 0, b if a & 2 else 0, b if a & 1 else 0)
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for y in range(rows):
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for x in range(cols):
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data = vcs.read(2)
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(sh,) = struct.unpack("=H", data)
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attr = (sh >> 8) & 0xFF
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ch = sh & 0xFF
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if hichar == 0x100:
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attr >>= 1
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ink = attr & 0x0F
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paper = (attr>>4) & 0x0F
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b = 1.0 if attr & 0x80 else 0.75
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if sh & hichar:
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ch |= 0x100
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cr.set_source_rgb(*CairoColor(b, paper))
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cr.rectangle(x*8, y*16, 8, 16)
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cr.fill()
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cr.set_source_rgb(*CairoColor(b, ink))
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cr.move_to(x*8, 12 + y*16)
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cr.show_text(charmap.get(ch, u'?'))
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cr.stroke()
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vcs.close()
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surf.write_to_png(png)
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