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ArgbImage from arbitrary (but square) image data + guess rgb-mask types

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relikd
2021-10-11 23:56:35 +02:00
parent 2317ec867c
commit 8ca46c7f40
2 changed files with 70 additions and 49 deletions
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33
icnsutil/ArgbImage.py
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@@ -1,5 +1,6 @@
#!/usr/bin/env python3
from typing import Union, Iterator, Optional
from math import sqrt
from . import IcnsType, PackBytes
try:
from PIL import Image
@@ -72,12 +73,23 @@ class ArgbImage:
if is_argb or data[:4] == b'\x00\x00\x00\x00':
data = data[4:] # remove ARGB and it32 header
idat = PackBytes.unpack(data)
iType = IcnsType.match_maxsize(len(idat), 'argb' if is_argb else 'rgb')
uncompressed_data = PackBytes.unpack(data)
self.size = iType.size
self.channels = iType.channels or 0
self.a, self.r, self.g, self.b = iType.split_channels(idat)
self.channels = 4 if is_argb else 3
per_channel = len(uncompressed_data) // self.channels
w = sqrt(per_channel)
if w != int(w):
raise NotImplementedError(
'Could not determine square image size. Or unknown type.')
self.size = (int(w), int(w))
if self.channels == 3:
self.a = [255] * per_channel # opaque alpha channel for rgb
else:
self.a = uncompressed_data[:per_channel]
i = 1 if is_argb else 0
self.r = uncompressed_data[(i + 0) * per_channel:(i + 1) * per_channel]
self.g = uncompressed_data[(i + 1) * per_channel:(i + 2) * per_channel]
self.b = uncompressed_data[(i + 2) * per_channel:(i + 3) * per_channel]
def load_mask(self, *, file: Optional[str] = None,
data: Optional[bytes] = None) -> None:
@@ -99,15 +111,12 @@ class ArgbImage:
return bytes(PackBytes.msb_stream(self.a, bits=bits))
def rgb_data(self, *, compress: bool = True) -> bytes:
return b''.join(self._raw_rgb_channels(compress=compress))
return b''.join(PackBytes.pack(x) if compress else bytes(x)
for x in (self.r, self.g, self.b))
def argb_data(self, *, compress: bool = True) -> bytes:
return b'ARGB' + self.mask_data(compress=compress) + \
b''.join(self._raw_rgb_channels(compress=compress))
def _raw_rgb_channels(self, *, compress: bool = True) -> Iterator[bytes]:
for x in (self.r, self.g, self.b):
yield (PackBytes.pack(x) if compress else bytes(x))
return b'ARGB' + self.mask_data(compress=compress) \
+ self.rgb_data(compress=compress)
def _load_png(self, fname: str) -> None:
if not PIL_ENABLED:

86
icnsutil/IcnsType.py
View File

@@ -54,20 +54,6 @@ class Media:
return self.desc # guaranteed to be icon, mask, or iconmask
return self.types[-1]
def split_channels(self, uncompressed_data: List[int]) -> Iterator[
List[int]]:
if self.channels not in [3, 4]:
raise NotImplementedError('Only RGB and ARGB data supported.')
if len(uncompressed_data) != self.maxsize:
raise ValueError(
'Data does not match expected uncompressed length. '
'{} != {}'.format(len(uncompressed_data), self.maxsize))
per_channel = self.maxsize // self.channels
if self.channels == 3:
yield [255] * per_channel # opaque alpha channel for rgb
for i in range(self.channels):
yield uncompressed_data[per_channel * i:per_channel * (i + 1)]
def decompress(self, data: bytes, ext: Optional[str] = '-?-') -> Optional[
List[int]]:
''' Returns None if media is not decompressable. '''
@@ -230,7 +216,7 @@ def get(key: Media.KeyT) -> Media:
def match_maxsize(total: int, typ: str) -> Media:
assert(typ == 'argb' or typ == 'rgb')
ret = [x for x in _TYPES.values() if x.is_type(typ) and x.maxsize == total]
return ret[0] # TODO: handle cases with multiple options? eg: is32 icp4
return _best_option(ret, typ)
def guess(data: bytes, filename: Optional[str] = None) -> Media:
@@ -247,38 +233,64 @@ def guess(data: bytes, filename: Optional[str] = None) -> Media:
if bname in _TYPES:
return _TYPES[bname]
ext = RawData.determine_file_ext(data)
if not ext and filename and filename.endswith('.rgb'):
ext = 'rgb'
# Guess by image size and retina flag
size = RawData.determine_image_size(data, ext) if ext else None
retina = bname.lower().endswith('@2x') if filename else False
if size == (1024, 1024):
retina = True # stupid double usage of ic10
# Icns specific names
# Filter attributes
desc = None
if ext == 'icns' and filename:
for candidate in ['template', 'selected', 'dark']:
if filename.endswith(candidate + '.icns'):
desc = candidate
break
size = None
maxsize = None
retina = False
# Guess extension
ext = RawData.determine_file_ext(data)
if not ext and filename:
if filename.endswith('.rgb'):
ext = 'rgb'
elif filename.endswith('.mask'):
maxsize = len(data)
desc = 'mask'
# Guess image size
if ext:
size = RawData.determine_image_size(data, ext)
# if filename is set, then bname is also set (see above)
if filename:
# Guess retina flag
retina = bname.lower().endswith('@2x')
# Guess icns-specific type
if ext == 'icns':
for candidate in ['template', 'selected', 'dark']:
if bname.endswith(candidate):
desc = candidate
break
# stupid double usage of ic10, enforce retina flag
if size == (1024, 1024):
retina = True
choices = []
for x in _TYPES.values():
if retina != x.retina: # png + jp2
continue
if desc and desc != x.desc: # icns or rgb-mask
continue
if ext:
if size != x.size or not x.is_type(ext):
continue
if desc and desc != x.desc: # icns only
continue
else: # not ext
if x.ext_certain:
continue
if maxsize and x.maxsize and maxsize != x.maxsize: # mask only
continue
choices.append(x)
return _best_option(choices, ext)
def _best_option(choices: List[Media], ext: Optional[str] = None) -> Media:
'''
Get most favorable media type.
If more than one option exists, choose based on order index of ext.
'''
if len(choices) == 1:
return choices[0]
# Try get most favorable type (sort order of types)
@@ -294,7 +306,7 @@ def guess(data: bytes, filename: Optional[str] = None) -> Media:
best_choice.append(x)
if len(best_choice) == 1:
return best_choice[0]
# Else
raise CanNotDetermine(
'Could not determine type for file: "{}" – one of {}.'.format(
filename, [x.key for x in choices]))
choices = best_choice
raise CanNotDetermine('Could not determine type – one of {}.'.format(
[x.key for x in choices]))