demo code vor vcsa attributes

play zone/vcsa.py

@@ -0,0 +1,92 @@
+#!/usr/bin/python
+
+from cairo import *
+from fcntl import ioctl
+from array import array
+import struct
+import errno
+import sys
+
+GIO_UNIMAP = 0x4B66
+VT_GETHIFONTMASK = 0x560D
+
+if len(sys.argv) != 3:
+    print "Usage: %s <tty-number> <output-png>" % sys.argv[0]
+    exit()
+
+ttyno = int(sys.argv[1])
+png = sys.argv[2]
+
+tty = open('/dev/tty%d' % ttyno, 'rb')
+himask = array("H", (0,))
+ioctl(tty, VT_GETHIFONTMASK, himask)
+hichar, = struct.unpack_from("@H", himask)
+
+sz = 512
+while True:
+    try:
+        unipairs = array("H", [0]*(2*sz))
+        unimapdesc = array("B", struct.pack("@HP", sz, unipairs.buffer_info()[0]))
+        ioctl(tty.fileno(), GIO_UNIMAP, unimapdesc)
+        break
+    except IOError as e:
+        if e.errno != errno.ENOMEM:
+            raise
+        sz *= 2
+tty.close()
+
+ncodes, = struct.unpack_from("@H", unimapdesc)
+utable = struct.unpack_from("@%dH" % (2*ncodes), unipairs)
+
+charmap = {}
+for u, b in zip(utable[::2], utable[1::2]):
+    if charmap.get(b) is None:
+        charmap[b] = unichr(u)
+
+vcs = open('/dev/vcsa%d' % ttyno, 'rb')
+
+head = vcs.read(4)
+rows = ord(head[0])
+cols = ord(head[1])
+caretX = ord(head[2])
+caretY = ord(head[3])
+
+surf = ImageSurface(FORMAT_RGB24, cols * 8, rows * 16)
+
+cr = Context(surf)
+cr.set_source_rgb(1,1,1)
+cr.set_font_face(ToyFontFace("Mono", FONT_SLANT_NORMAL, FONT_WEIGHT_NORMAL));
+m = Matrix()
+m.scale(10.0, 12.0)
+cr.set_font_matrix(m)
+
+def CairoColor(b, a):
+    return (b if a & 4 else 0, b if a & 2 else 0, b if a & 1 else 0)
+
+for y in range(rows):
+    for x in range(cols):
+        data = vcs.read(2)
+        (sh,) = struct.unpack("=H", data)
+        attr = (sh >> 8) & 0xFF
+        ch = sh & 0xFF
+        if hichar == 0x100:
+            attr >>= 1
+
+        ink = attr & 0x0F
+        paper = (attr>>4) & 0x0F
+        b = 1.0 if attr & 0x80 else 0.75
+        if sh & hichar:
+            ch |= 0x100
+
+        cr.set_source_rgb(*CairoColor(b, paper))
+        cr.rectangle(x*8, y*16, 8, 16)
+        cr.fill()
+
+        cr.set_source_rgb(*CairoColor(b, ink))
+        cr.move_to(x*8, 12 + y*16)
+        cr.show_text(charmap.get(ch, u'?'))
+        cr.stroke()
+vcs.close()
+
+surf.write_to_png(png)
+