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Merge pull request #7925 from radarhere/qoi

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Hugo van Kemenade 2024-04-01 08:24:37 +03:00 committed by GitHub
commit 1d733f498f
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5 changed files with 33 additions and 25 deletions
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4
src/PIL/BlpImagePlugin.py
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@ -341,7 +341,7 @@ class BLP1Decoder(_BLPBaseDecoder):
if self._blp_encoding in (4, 5):
palette = self._read_palette()
data = self._read_bgra(palette)
self.set_as_raw(bytes(data))
self.set_as_raw(data)
else:
msg = f"Unsupported BLP encoding {repr(self._blp_encoding)}"
raise BLPFormatError(msg)
@ -412,7 +412,7 @@ class BLP2Decoder(_BLPBaseDecoder):
msg = f"Unknown BLP compression {repr(self._blp_compression)}"
raise BLPFormatError(msg)
self.set_as_raw(bytes(data))
self.set_as_raw(data)
class BLPEncoder(ImageFile.PyEncoder):

3
src/PIL/BmpImagePlugin.py
View File

@ -291,7 +291,8 @@ class BmpRleDecoder(ImageFile.PyDecoder):
rle4 = self.args[1]
data = bytearray()
x = 0
while len(data) < self.state.xsize * self.state.ysize:
dest_length = self.state.xsize * self.state.ysize
while len(data) < dest_length:
pixels = self.fd.read(1)
byte = self.fd.read(1)
if not pixels or not byte:

5
src/PIL/DdsImagePlugin.py
View File

@ -497,7 +497,8 @@ class DdsRgbDecoder(ImageFile.PyDecoder):
data = bytearray()
bytecount = bitcount // 8
while len(data) < self.state.xsize * self.state.ysize * len(masks):
dest_length = self.state.xsize * self.state.ysize * len(masks)
while len(data) < dest_length:
value = int.from_bytes(self.fd.read(bytecount), "little")
for i, mask in enumerate(masks):
masked_value = value & mask
@ -505,7 +506,7 @@ class DdsRgbDecoder(ImageFile.PyDecoder):
data += o8(
int(((masked_value >> mask_offsets[i]) / mask_totals[i]) * 255)
)
self.set_as_raw(bytes(data))
self.set_as_raw(data)
return -1, 0

3
src/PIL/PpmImagePlugin.py
View File

@ -307,7 +307,8 @@ class PpmDecoder(ImageFile.PyDecoder):
out_byte_count = 4 if self.mode == "I" else 1
out_max = 65535 if self.mode == "I" else 255
bands = Image.getmodebands(self.mode)
while len(data) < self.state.xsize * self.state.ysize * bands * out_byte_count:
dest_length = self.state.xsize * self.state.ysize * bands * out_byte_count
while len(data) < dest_length:
pixels = self.fd.read(in_byte_count * bands)
if len(pixels) < in_byte_count * bands:
# eof

43
src/PIL/QoiImagePlugin.py
View File

@ -11,7 +11,6 @@ import os
from . import Image, ImageFile
from ._binary import i32be as i32
from ._binary import o8
def _accept(prefix):
@ -49,41 +48,48 @@ class QoiDecoder(ImageFile.PyDecoder):
def decode(self, buffer):
self._previously_seen_pixels = {}
self._previous_pixel = None
self._add_to_previous_pixels(b"".join(o8(i) for i in (0, 0, 0, 255)))
self._add_to_previous_pixels(bytearray((0, 0, 0, 255)))
data = bytearray()
bands = Image.getmodebands(self.mode)
while len(data) < self.state.xsize * self.state.ysize * bands:
dest_length = self.state.xsize * self.state.ysize * bands
while len(data) < dest_length:
byte = self.fd.read(1)[0]
if byte == 0b11111110: # QOI_OP_RGB
value = self.fd.read(3) + self._previous_pixel[3:]
value = bytearray(self.fd.read(3)) + self._previous_pixel[3:]
elif byte == 0b11111111: # QOI_OP_RGBA
value = self.fd.read(4)
else:
op = byte >> 6
if op == 0: # QOI_OP_INDEX
op_index = byte & 0b00111111
value = self._previously_seen_pixels.get(op_index, (0, 0, 0, 0))
elif op == 1: # QOI_OP_DIFF
value = (
(self._previous_pixel[0] + ((byte & 0b00110000) >> 4) - 2)
% 256,
(self._previous_pixel[1] + ((byte & 0b00001100) >> 2) - 2)
% 256,
(self._previous_pixel[2] + (byte & 0b00000011) - 2) % 256,
value = self._previously_seen_pixels.get(
op_index, bytearray((0, 0, 0, 0))
)
elif op == 1: # QOI_OP_DIFF
value = bytearray(
(
(self._previous_pixel[0] + ((byte & 0b00110000) >> 4) - 2)
% 256,
(self._previous_pixel[1] + ((byte & 0b00001100) >> 2) - 2)
% 256,
(self._previous_pixel[2] + (byte & 0b00000011) - 2) % 256,
self._previous_pixel[3],
)
)
value += (self._previous_pixel[3],)
elif op == 2: # QOI_OP_LUMA
second_byte = self.fd.read(1)[0]
diff_green = (byte & 0b00111111) - 32
diff_red = ((second_byte & 0b11110000) >> 4) - 8
diff_blue = (second_byte & 0b00001111) - 8
value = tuple(
(self._previous_pixel[i] + diff_green + diff) % 256
for i, diff in enumerate((diff_red, 0, diff_blue))
value = bytearray(
tuple(
(self._previous_pixel[i] + diff_green + diff) % 256
for i, diff in enumerate((diff_red, 0, diff_blue))
)
)
value += (self._previous_pixel[3],)
value += self._previous_pixel[3:]
elif op == 3: # QOI_OP_RUN
run_length = (byte & 0b00111111) + 1
value = self._previous_pixel
@ -91,13 +97,12 @@ class QoiDecoder(ImageFile.PyDecoder):
value = value[:3]
data += value * run_length
continue
value = b"".join(o8(i) for i in value)
self._add_to_previous_pixels(value)
if bands == 3:
value = value[:3]
data += value
self.set_as_raw(bytes(data))
self.set_as_raw(data)
return -1, 0