def _read_image(disp, stream):
try:
header = stream.read(2 * 4)
if not header:
return None
(width, height) = struct.unpack("=II", header)
data = stream.read(width * height * 4)
if len(data) < width * height * 4:
log.warn("Corrupt _NET_WM_ICON")
return None
except Exception as e:
log.warn("Weird corruption in _NET_WM_ICON: %s", e)
return None
# Cairo wants a native-endian array here, and since the icon is
# transmitted as CARDINALs, that's what we get. It might seem more
# sensible to use ImageSurface.create_for_data (at least it did to me!)
# but then you end up with a surface that refers to the memory you pass in
# directly, and also .get_data() doesn't work on it, and it breaks the
# test suite and blah. This at least works, as odd as it is:
surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
# old versions of cairo do not have this method, just ignore it
if not hasattr(surf, "get_data"):
log.warn("Your Cairo is too old! Carrying on as best I can, "
"but don't expect a miracle")
return None
surf.get_data()[:] = data
# Cairo uses premultiplied alpha. EWMH actually doesn't specify what it
# uses, but apparently the de-facto standard is non-premultiplied. (At
# least that's what Compiz's sources say.)
premultiply_argb_in_place(surf.get_data())
return (width * height, surf)
def _read_image(disp, stream):
try:
header = stream.read(2 * 4)
if not header:
return None
(width, height) = struct.unpack("=II", header)
data = stream.read(width * height * 4)
if len(data) < width * height * 4:
log.warn("Corrupt _NET_WM_ICON")
return None
except Exception as e:
log.warn("Weird corruption in _NET_WM_ICON: %s", e)
return None
# Cairo wants a native-endian array here, and since the icon is
# transmitted as CARDINALs, that's what we get. It might seem more
# sensible to use ImageSurface.create_for_data (at least it did to me!)
# but then you end up with a surface that refers to the memory you pass in
# directly, and also .get_data() doesn't work on it, and it breaks the
# test suite and blah. This at least works, as odd as it is:
surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
# old versions of cairo do not have this method, just ignore it
if not hasattr(surf, "get_data"):
log.warn("Your Cairo is too old! Carrying on as best I can, "
"but don't expect a miracle")
return None
surf.get_data()[:] = data
# Cairo uses premultiplied alpha. EWMH actually doesn't specify what it
# uses, but apparently the de-facto standard is non-premultiplied. (At
# least that's what Compiz's sources say.)
premultiply_argb_in_place(surf.get_data())
return (width * height, surf)
# sensible to use ImageSurface.create_for_data (at least it did to me!)
# but then you end up with a surface that refers to the memory you pass in
# directly, and also .get_data() doesn't work on it, and it breaks the
# test suite and blah. This at least works, as odd as it is:
surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
# old versions of cairo do not have this method, just ignore it
if not hasattr(surf, "get_data"):
log.warn("Your Cairo is too old! Carrying on as best I can, "
"but don't expect a miracle")
return None
surf.get_data()[:] = data
# Cairo uses premultiplied alpha. EWMH actually doesn't specify what it
# uses, but apparently the de-facto standard is non-premultiplied. (At
# least that's what Compiz's sources say.)
if premultiply_argb_in_place:
premultiply_argb_in_place(surf.get_data())
return (width * height, surf)
# This returns a cairo ImageSurface which contains the largest icon defined in
# a _NET_WM_ICON property.
def NetWMIcons(disp, data):
icons = []
stream = StringIOClass(data)
while True:
size_image = _read_image(disp, stream)
if size_image is None:
break
icons.append(size_image)
if not icons:
return None
icons.sort()
# transmitted as CARDINALs, that's what we get. It might seem more
# sensible to use ImageSurface.create_for_data (at least it did to me!)
# but then you end up with a surface that refers to the memory you pass in
# directly, and also .get_data() doesn't work on it, and it breaks the
# test suite and blah. This at least works, as odd as it is:
surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
# old versions of cairo do not have this method, just ignore it
if not hasattr(surf, "get_data"):
log.warn("Your Cairo is too old! Carrying on as best I can, "
"but don't expect a miracle")
return None
surf.get_data()[:] = data
# Cairo uses premultiplied alpha. EWMH actually doesn't specify what it
# uses, but apparently the de-facto standard is non-premultiplied. (At
# least that's what Compiz's sources say.)
premultiply_argb_in_place(surf.get_data())
return (width * height, surf)
# This returns a cairo ImageSurface which contains the largest icon defined in
# a _NET_WM_ICON property.
def NetWMIcons(disp, data):
icons = []
stream = StringIOClass(data)
while True:
size_image = _read_image(disp, stream)
if size_image is None:
break
icons.append(size_image)
if not icons:
return None
icons.sort()
