def chunk_DHDR(self, offset, bytes):
"DHDR -- delta image follows"
# assertions
if self.count == 0:
raise SyntaxError("misplaced DHDR chunk")
s = self.fp.read(bytes)
size, mode, rawmode = self.__getmodesize(s)
# delta header
diff = i8(s[13])
offs = i32(s[14:18]), i32(s[18:22])
bbox = offs + (offs[0]+size[0], offs[1]+size[1])
if Image.DEBUG:
print("DHDR", diff, bbox)
# FIXME: decode and apply image
self.action = ("DHDR", diff, bbox)
# setup decoder
self.im = Image.core.new(mode, size)
self.decoder = Image.core.zip_decoder(rawmode)
self.decoder.setimage(self.im, (0,0) + size)
self.data = b""
return s
def __getmodesize(self, s, full=1):
size = i32(s), i32(s[4:])
try:
mode, rawmode = _MODES[(i8(s[8]), i8(s[9]))]
except:
raise SyntaxError("unknown image mode")
if full:
if i8(s[12]):
pass # interlace not yet supported
if i8(s[11]):
raise SyntaxError("unknown filter category")
return size, mode, rawmode
def chunk_DHDR(self, offset, bytes):
"DHDR -- delta image follows"
# assertions
if self.count == 0:
raise SyntaxError("misplaced DHDR chunk")
s = self.fp.read(bytes)
size, mode, rawmode = self.__getmodesize(s)
# delta header
diff = i8(s[13])
offs = i32(s[14:18]), i32(s[18:22])
bbox = offs + (offs[0]+size[0], offs[1]+size[1])
if Image.DEBUG:
print("DHDR", diff, bbox)
# FIXME: decode and apply image
self.action = ("DHDR", diff, bbox)
# setup decoder
self.im = Image.core.new(mode, size)
self.decoder = Image.core.zip_decoder(rawmode)
self.decoder.setimage(self.im, (0,0) + size)
self.data = b""
return s
def __getmodesize(self, s, full=1):
size = i32(s), i32(s[4:])
try:
mode, rawmode = _MODES[(i8(s[8]), i8(s[9]))]
except:
raise SyntaxError("unknown image mode")
if full:
if i8(s[12]):
pass # interlace not yet supported
if i8(s[11]):
raise SyntaxError("unknown filter category")
return size, mode, rawmode
def chunk_AHDR(self, offset, bytes):
"AHDR -- animation header"
# assertions
if self.count != 0:
raise SyntaxError("misplaced AHDR chunk")
s = self.fp.read(bytes)
self.size = i32(s), i32(s[4:])
try:
self.mode, self.rawmode = _MODES[(i8(s[8]), i8(s[9]))]
except:
raise SyntaxError("unknown ARG mode")
if Image.DEBUG:
print("AHDR size", self.size)
print("AHDR mode", self.mode, self.rawmode)
return s
def chunk_AHDR(self, offset, bytes):
"AHDR -- animation header"
# assertions
if self.count != 0:
raise SyntaxError("misplaced AHDR chunk")
s = self.fp.read(bytes)
self.size = i32(s), i32(s[4:])
try:
self.mode, self.rawmode = _MODES[(i8(s[8]), i8(s[9]))]
except:
raise SyntaxError("unknown ARG mode")
if Image.DEBUG:
print("AHDR size", self.size)
print("AHDR mode", self.mode, self.rawmode)
return s