/usr/lib/python2.7/dist-packages/DisplayCAL/edid.py is in dispcalgui 3.1.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from hashlib import md5
import codecs
import math
import os
import string
import struct
import sys
if sys.platform == "win32":
from threading import _MainThread, currentThread
wmi = None
if sys.getwindowsversion() >= (6, ):
# Use WMI for Vista/Win7
import pythoncom
try:
import wmi
except:
pass
else:
# Use registry as fallback for Win2k/XP/2003
import _winreg
import pywintypes
import win32api
elif sys.platform != "darwin":
try:
import xrandr
except ImportError:
xrandr = None
else:
import binascii
import re
import subprocess as sp
import config
from log import log, safe_print
from util_str import make_ascii_printable, strtr
if sys.platform == "win32":
import util_win
HEADER = (0, 8)
MANUFACTURER_ID = (8, 10)
PRODUCT_ID = (10, 12)
SERIAL_32 = (12, 16)
WEEK_OF_MANUFACTURE = 16
YEAR_OF_MANUFACTURE = 17
EDID_VERSION = 18
EDID_REVISION = 19
MAX_H_SIZE_CM = 21
MAX_V_SIZE_CM = 22
GAMMA = 23
FEATURES = 24
LO_RG_XY = 25
LO_BW_XY = 26
HI_R_X = 27
HI_R_Y = 28
HI_G_X = 29
HI_G_Y = 30
HI_B_X = 31
HI_B_Y = 32
HI_W_X = 33
HI_W_Y = 34
BLOCKS = ((54, 72), (72, 90), (90, 108), (108, 126))
BLOCK_TYPE = 3
BLOCK_CONTENTS = (5, 18)
BLOCK_TYPE_SERIAL_ASCII = "\xff"
BLOCK_TYPE_ASCII = "\xfe"
BLOCK_TYPE_MONITOR_NAME = "\xfc"
BLOCK_TYPE_COLOR_POINT = "\xfb"
BLOCK_TYPE_COLOR_MANAGEMENT_DATA = "\xf9"
EXTENSION_FLAG = 126
CHECKSUM = 127
BLOCK_DI_EXT = "\x40"
TRC = (81, 127)
pnpidcache = {}
def combine_hi_8lo(hi, lo):
return hi << 8 | lo
def get_edid(display_no=0, display_name=None, device=None):
""" Get and parse EDID. Return dict.
On Mac OS X, you need to specify a display name.
On all other platforms, you need to specify a display number (zero-based).
"""
edid = None
if sys.platform == "win32":
if not device:
# The ordering will work as long as Argyll continues using
# EnumDisplayMonitors
monitors = util_win.get_real_display_devices_info()
moninfo = monitors[display_no]
device = util_win.get_active_display_device(moninfo["Device"])
if not device:
return {}
id = device.DeviceID.split("\\")[1]
wmi_connection = None
not_main_thread = currentThread().__class__ is not _MainThread
if wmi:
if not_main_thread:
pythoncom.CoInitialize()
wmi_connection = wmi.WMI(namespace="WMI")
if wmi_connection:
# Use WMI for Vista/Win7
# http://msdn.microsoft.com/en-us/library/Aa392707
try:
msmonitors = wmi_connection.WmiMonitorDescriptorMethods()
except Exception, exception:
if not_main_thread:
pythoncom.CoUninitialize()
raise WMIError(exception)
for msmonitor in msmonitors:
if msmonitor.InstanceName.split("\\")[1] == id:
try:
edid = msmonitor.WmiGetMonitorRawEEdidV1Block(0)
except:
# No EDID entry
pass
else:
edid = "".join(chr(i) for i in edid[0])
break
if not_main_thread:
pythoncom.CoUninitialize()
elif sys.getwindowsversion() < (6, ):
# Use registry as fallback for Win2k/XP/2003
# http://msdn.microsoft.com/en-us/library/ff546173%28VS.85%29.aspx
# "The Enum tree is reserved for use by operating system components,
# and its layout is subject to change. (...) Drivers and Windows
# applications must not access the Enum tree directly."
# But do we care? Probably not, as older Windows' API isn't likely
# gonna change.
driver = "\\".join(device.DeviceID.split("\\")[-2:])
subkey = "\\".join(["SYSTEM", "CurrentControlSet", "Enum",
"DISPLAY", id])
try:
key = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, subkey)
except WindowsError:
# Registry error
safe_print("Windows registry error: Key",
"\\".join(["HKEY_LOCAL_MACHINE", subkey]),
"does not exist.")
return {}
numsubkeys, numvalues, mtime = _winreg.QueryInfoKey(key)
for i in range(numsubkeys):
hkname = _winreg.EnumKey(key, i)
hk = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,
"\\".join([subkey, hkname]))
try:
test = _winreg.QueryValueEx(hk, "Driver")[0]
except WindowsError:
# No Driver entry
continue
if test == driver:
# Found our display device
try:
devparms = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,
"\\".join([subkey, hkname,
"Device Parameters"]))
except WindowsError:
# No Device Parameters (registry error?)
safe_print("Windows registry error: Key",
"\\".join(["HKEY_LOCAL_MACHINE", subkey,
hkname, "Device Parameters"]),
"does not exist.")
continue
try:
edid = _winreg.QueryValueEx(devparms, "EDID")[0]
except WindowsError:
# No EDID entry
pass
else:
raise WMIError("No WMI connection")
elif sys.platform == "darwin":
# Get EDID via ioreg
p = sp.Popen(["ioreg", "-c", "IODisplay", "-S", "-w0"], stdout=sp.PIPE)
stdout, stderr = p.communicate()
if stdout:
for edid in [binascii.unhexlify(edid_hex) for edid_hex in
re.findall('"IODisplayEDID"\s*=\s*<([0-9A-Fa-f]*)>',
stdout)]:
if edid and len(edid) >= 128:
parsed_edid = parse_edid(edid)
if parsed_edid.get("monitor_name",
parsed_edid.get("ascii")) == display_name:
# On Mac OS X, you need to specify a display name
# because the order is unknown
return parsed_edid
return {}
elif xrandr:
# Check XrandR output properties
edid = None
for key in ("EDID", "EDID_DATA"):
try:
edid = xrandr.get_output_property(display_no, key,
xrandr.XA_INTEGER)
except ValueError:
pass
else:
break
if not edid:
# Check X11 atoms
for key in ("XFree86_DDC_EDID1_RAWDATA",
"XFree86_DDC_EDID2_RAWDATA"):
if display_no > 0:
key += "_%s" % display_no
try:
edid = xrandr.get_atom(key)
except ValueError:
pass
else:
break
if edid:
edid = "".join(chr(i) for i in edid)
if edid and len(edid) >= 128:
return parse_edid(edid)
return {}
def parse_manufacturer_id(block):
""" Parse the manufacturer id and return decoded string.
The range is always ASCII charcode 64 to 95.
"""
h = combine_hi_8lo(ord(block[0]), ord(block[1]))
manufacturer_id = []
for shift in (10, 5, 0):
manufacturer_id.append(chr(((h >> shift) & 0x1f) + ord('A') - 1))
return "".join(manufacturer_id).strip()
def get_manufacturer_name(manufacturer_id):
""" Try and get a nice descriptive string for our manufacturer id.
This uses either hwdb or pnp.ids which will be looked for in several places.
If it can't find the file, it returns None.
Examples:
SAM -> Samsung Electric Company
NEC -> NEC Corporation
hwdb/pnp.ids can be created from Excel data available from Microsoft:
http://www.microsoft.com/whdc/system/pnppwr/pnp/pnpid.mspx
"""
if not pnpidcache:
paths = ["/usr/lib/udev/hwdb.d/20-acpi-vendor.hwdb", # systemd
"/usr/share/hwdata/pnp.ids", # hwdata, e.g. Red Hat
"/usr/share/misc/pnp.ids", # pnputils, e.g. Debian
"/usr/share/libgnome-desktop/pnp.ids"] # fallback gnome-desktop
if sys.platform in ("darwin", "win32"):
paths.append(os.path.join(config.pydir, "pnp.ids")) # fallback
for path in paths:
if os.path.isfile(path):
try:
pnp_ids = codecs.open(path, "r", "UTF-8", "replace")
except IOError:
pass
else:
id, name = None, None
try:
for line in pnp_ids:
if path.endswith("hwdb"):
if line.strip().startswith("acpi:"):
id = line.split(":")[1][:3]
continue
elif line.strip().startswith("ID_VENDOR_FROM_DATABASE"):
name = line.split("=", 1)[1].strip()
else:
continue
if not id or not name or id in pnpidcache:
continue
else:
try:
# Strip leading/trailing whitespace
# (non-breaking spaces too)
id, name = line.strip(string.whitespace +
u"\u00a0").split(None,
1)
except ValueError:
continue
pnpidcache[id] = name
except OSError:
continue
finally:
pnp_ids.close()
break
return pnpidcache.get(manufacturer_id)
def edid_get_bit(value, bit):
return (value & (1 << bit)) >> bit
def edid_get_bits(value, begin, end):
mask = (1 << (end - begin + 1)) - 1
return (value >> begin) & mask
def edid_decode_fraction(high, low):
result = 0.0
high = (high << 2) | low
for i in xrange(0, 10):
result += edid_get_bit(high, i) * math.pow(2, i - 10)
return result
def edid_parse_string(desc):
# Return value should match colord's cd_edid_parse_string in cd-edid.c
# Remember: In C, NULL terminates a string, so do the same here
# Replace newline with NULL, then strip anything after first NULL byte
# (if any), then strip trailing whitespace
desc = strtr(desc[:13], {"\n": "\0", "\r": "\0"}).split("\0")[0].rstrip()
if desc:
# Replace all non-printable chars with NULL
# Afterwards, the amount of NULL bytes is the number of replaced chars
desc = make_ascii_printable(desc, subst="\0")
if desc.count("\0") <= 4:
# Only use string if max 4 replaced chars
# Replace any NULL chars with dashes to make a printable string
return desc.replace("\0", "-")
def parse_edid(edid):
""" Parse raw EDID data (binary string) and return dict. """
hash = md5(edid).hexdigest()
header = edid[HEADER[0]:HEADER[1]]
manufacturer_id = parse_manufacturer_id(edid[MANUFACTURER_ID[0]:MANUFACTURER_ID[1]])
manufacturer = get_manufacturer_name(manufacturer_id)
product_id = struct.unpack("<H", edid[PRODUCT_ID[0]:PRODUCT_ID[1]])[0]
serial_32 = struct.unpack("<I", edid[SERIAL_32[0]:SERIAL_32[1]])[0]
week_of_manufacture = ord(edid[WEEK_OF_MANUFACTURE])
year_of_manufacture = ord(edid[YEAR_OF_MANUFACTURE]) + 1990
edid_version = ord(edid[EDID_VERSION])
edid_revision = ord(edid[EDID_REVISION])
max_h_size_cm = ord(edid[MAX_H_SIZE_CM])
max_v_size_cm = ord(edid[MAX_V_SIZE_CM])
if edid[GAMMA] != "\xff":
gamma = ord(edid[GAMMA]) / 100.0 + 1
features = ord(edid[FEATURES])
red_x = edid_decode_fraction(ord(edid[HI_R_X]),
edid_get_bits(ord(edid[LO_RG_XY]), 6, 7))
red_y = edid_decode_fraction(ord(edid[HI_R_Y]),
edid_get_bits(ord(edid[LO_RG_XY]), 4, 5))
green_x = edid_decode_fraction(ord(edid[HI_G_X]),
edid_get_bits(ord(edid[LO_RG_XY]), 2, 3))
green_y = edid_decode_fraction(ord(edid[HI_G_Y]),
edid_get_bits(ord(edid[LO_RG_XY]), 0, 1))
blue_x = edid_decode_fraction(ord(edid[HI_B_X]),
edid_get_bits(ord(edid[LO_BW_XY]), 6, 7))
blue_y = edid_decode_fraction(ord(edid[HI_B_Y]),
edid_get_bits(ord(edid[LO_BW_XY]), 4, 5))
white_x = edid_decode_fraction(ord(edid[HI_W_X]),
edid_get_bits(ord(edid[LO_BW_XY]), 2, 3))
white_y = edid_decode_fraction(ord(edid[HI_W_Y]),
edid_get_bits(ord(edid[LO_BW_XY]), 0, 1))
result = locals()
if not manufacturer:
del result["manufacturer"]
text_types = {BLOCK_TYPE_SERIAL_ASCII: "serial_ascii",
BLOCK_TYPE_ASCII: "ascii",
BLOCK_TYPE_MONITOR_NAME: "monitor_name"}
# Parse descriptor blocks
for start, stop in BLOCKS:
block = edid[start:stop]
if block[:BLOCK_TYPE] != "\0\0\0":
# Ignore pixel clock data
continue
text_type = text_types.get(block[BLOCK_TYPE])
if text_type:
desc = edid_parse_string(block[BLOCK_CONTENTS[0]:BLOCK_CONTENTS[1]])
if desc is not None:
result[text_type] = desc
elif block[BLOCK_TYPE] == BLOCK_TYPE_COLOR_POINT:
for i in (5, 10):
# 2nd white point index in range 1...255
# 3rd white point index in range 2...255
# 0 = do not use
if ord(block[i]) > i / 5:
white_x = edid_decode_fraction(ord(edid[i + 2]),
edid_get_bits(ord(edid[i + 1]),
2, 3))
result["white_x_" + str(ord(block[i]))] = white_x
if not result.get("white_x"):
result["white_x"] = white_x
white_y = edid_decode_fraction(ord(edid[i + 3]),
edid_get_bits(ord(edid[i + 1]),
0, 1))
result["white_y_" + str(ord(block[i]))] = white_y
if not result.get("white_y"):
result["white_y"] = white_y
if block[i + 4] != "\xff":
gamma = ord(block[i + 4]) / 100.0 + 1
result["gamma_" + str(ord(block[i]))] = gamma
if not result.get("gamma"):
result["gamma"] = gamma
elif block[BLOCK_TYPE] == BLOCK_TYPE_COLOR_MANAGEMENT_DATA:
# TODO: Implement? How could it be used?
result["color_management_data"] = block[BLOCK_CONTENTS[0]:BLOCK_CONTENTS[1]]
result["ext_flag"] = ord(edid[EXTENSION_FLAG])
result["checksum"] = ord(edid[CHECKSUM])
result["checksum_valid"] = sum(ord(char) for char in edid) % 256 == 0
if len(edid) > 128 and result["ext_flag"] > 0:
# Parse extension blocks
block = edid[128:]
while block:
if block[0] == BLOCK_DI_EXT:
if block[TRC[0]] != "\0":
# TODO: Implement
pass
block = block[128:]
return result
class WMIError(Exception):
pass
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