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Merge pull request #8651 from radarhere/blp
Corrected BLP1 alpha depth handling
This commit is contained in:
Hugo van Kemenade
GitHub
commit
dfb368a7e9
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@ -4,7 +4,7 @@ from pathlib import Path
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import pytest
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from PIL import Image
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from PIL import BlpImagePlugin, Image
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from .helper import (
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assert_image_equal,
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@ -19,6 +19,7 @@ def test_load_blp1() -> None:
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assert_image_equal_tofile(im, "Tests/images/blp/blp1_jpeg.png")
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with Image.open("Tests/images/blp/blp1_jpeg2.blp") as im:
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assert im.mode == "RGBA"
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im.load()
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@ -37,6 +38,13 @@ def test_load_blp2_dxt1a() -> None:
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assert_image_equal_tofile(im, "Tests/images/blp/blp2_dxt1a.png")
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def test_invalid_file() -> None:
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invalid_file = "Tests/images/flower.jpg"
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with pytest.raises(BlpImagePlugin.BLPFormatError):
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BlpImagePlugin.BlpImageFile(invalid_file)
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def test_save(tmp_path: Path) -> None:
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f = str(tmp_path / "temp.blp")
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@ -259,21 +259,36 @@ class BlpImageFile(ImageFile.ImageFile):
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def _open(self) -> None:
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self.magic = self.fp.read(4)
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self.fp.seek(5, os.SEEK_CUR)
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(self._blp_alpha_depth,) = struct.unpack("<b", self.fp.read(1))
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self.fp.seek(2, os.SEEK_CUR)
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self._size = struct.unpack("<II", self.fp.read(8))
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if self.magic in (b"BLP1", b"BLP2"):
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decoder = self.magic.decode()
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else:
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if not _accept(self.magic):
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msg = f"Bad BLP magic {repr(self.magic)}"
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raise BLPFormatError(msg)
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self._mode = "RGBA" if self._blp_alpha_depth else "RGB"
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self.tile = [ImageFile._Tile(decoder, (0, 0) + self.size, 0, self.mode)]
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compression = struct.unpack("<i", self.fp.read(4))[0]
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if self.magic == b"BLP1":
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alpha = struct.unpack("<I", self.fp.read(4))[0] != 0
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else:
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encoding = struct.unpack("<b", self.fp.read(1))[0]
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alpha = struct.unpack("<b", self.fp.read(1))[0] != 0
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alpha_encoding = struct.unpack("<b", self.fp.read(1))[0]
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self.fp.seek(1, os.SEEK_CUR) # mips
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self._size = struct.unpack("<II", self.fp.read(8))
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args: tuple[int, int, bool] | tuple[int, int, bool, int]
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if self.magic == b"BLP1":
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encoding = struct.unpack("<i", self.fp.read(4))[0]
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self.fp.seek(4, os.SEEK_CUR) # subtype
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args = (compression, encoding, alpha)
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offset = 28
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else:
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args = (compression, encoding, alpha, alpha_encoding)
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offset = 20
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decoder = self.magic.decode()
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self._mode = "RGBA" if alpha else "RGB"
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self.tile = [ImageFile._Tile(decoder, (0, 0) + self.size, offset, args)]
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class _BLPBaseDecoder(ImageFile.PyDecoder):
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@ -281,7 +296,7 @@ class _BLPBaseDecoder(ImageFile.PyDecoder):
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def decode(self, buffer: bytes | Image.SupportsArrayInterface) -> tuple[int, int]:
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try:
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self._read_blp_header()
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self._read_header()
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self._load()
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except struct.error as e:
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msg = "Truncated BLP file"
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@ -292,25 +307,9 @@ class _BLPBaseDecoder(ImageFile.PyDecoder):
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def _load(self) -> None:
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pass
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def _read_blp_header(self) -> None:
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assert self.fd is not None
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self.fd.seek(4)
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(self._blp_compression,) = struct.unpack("<i", self._safe_read(4))
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(self._blp_encoding,) = struct.unpack("<b", self._safe_read(1))
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(self._blp_alpha_depth,) = struct.unpack("<b", self._safe_read(1))
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(self._blp_alpha_encoding,) = struct.unpack("<b", self._safe_read(1))
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self.fd.seek(1, os.SEEK_CUR) # mips
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self.size = struct.unpack("<II", self._safe_read(8))
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if isinstance(self, BLP1Decoder):
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# Only present for BLP1
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(self._blp_encoding,) = struct.unpack("<i", self._safe_read(4))
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self.fd.seek(4, os.SEEK_CUR) # subtype
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self._blp_offsets = struct.unpack("<16I", self._safe_read(16 * 4))
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self._blp_lengths = struct.unpack("<16I", self._safe_read(16 * 4))
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def _read_header(self) -> None:
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self._offsets = struct.unpack("<16I", self._safe_read(16 * 4))
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self._lengths = struct.unpack("<16I", self._safe_read(16 * 4))
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def _safe_read(self, length: int) -> bytes:
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assert self.fd is not None
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@ -326,9 +325,11 @@ class _BLPBaseDecoder(ImageFile.PyDecoder):
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ret.append((b, g, r, a))
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return ret
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def _read_bgra(self, palette: list[tuple[int, int, int, int]]) -> bytearray:
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def _read_bgra(
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self, palette: list[tuple[int, int, int, int]], alpha: bool
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) -> bytearray:
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data = bytearray()
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_data = BytesIO(self._safe_read(self._blp_lengths[0]))
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_data = BytesIO(self._safe_read(self._lengths[0]))
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while True:
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try:
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(offset,) = struct.unpack("<B", _data.read(1))
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@ -336,7 +337,7 @@ class _BLPBaseDecoder(ImageFile.PyDecoder):
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break
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b, g, r, a = palette[offset]
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d: tuple[int, ...] = (r, g, b)
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if self._blp_alpha_depth:
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if alpha:
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d += (a,)
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data.extend(d)
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return data
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@ -344,19 +345,21 @@ class _BLPBaseDecoder(ImageFile.PyDecoder):
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class BLP1Decoder(_BLPBaseDecoder):
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def _load(self) -> None:
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if self._blp_compression == Format.JPEG:
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self._compression, self._encoding, alpha = self.args
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if self._compression == Format.JPEG:
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self._decode_jpeg_stream()
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elif self._blp_compression == 1:
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if self._blp_encoding in (4, 5):
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elif self._compression == 1:
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if self._encoding in (4, 5):
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palette = self._read_palette()
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data = self._read_bgra(palette)
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data = self._read_bgra(palette, alpha)
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self.set_as_raw(data)
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else:
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msg = f"Unsupported BLP encoding {repr(self._blp_encoding)}"
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msg = f"Unsupported BLP encoding {repr(self._encoding)}"
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raise BLPFormatError(msg)
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else:
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msg = f"Unsupported BLP compression {repr(self._blp_encoding)}"
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msg = f"Unsupported BLP compression {repr(self._encoding)}"
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raise BLPFormatError(msg)
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def _decode_jpeg_stream(self) -> None:
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@ -365,8 +368,8 @@ class BLP1Decoder(_BLPBaseDecoder):
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(jpeg_header_size,) = struct.unpack("<I", self._safe_read(4))
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jpeg_header = self._safe_read(jpeg_header_size)
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assert self.fd is not None
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self._safe_read(self._blp_offsets[0] - self.fd.tell()) # What IS this?
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data = self._safe_read(self._blp_lengths[0])
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self._safe_read(self._offsets[0] - self.fd.tell()) # What IS this?
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data = self._safe_read(self._lengths[0])
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data = jpeg_header + data
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image = JpegImageFile(BytesIO(data))
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Image._decompression_bomb_check(image.size)
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@ -383,47 +386,47 @@ class BLP1Decoder(_BLPBaseDecoder):
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class BLP2Decoder(_BLPBaseDecoder):
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def _load(self) -> None:
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self._compression, self._encoding, alpha, self._alpha_encoding = self.args
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palette = self._read_palette()
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assert self.fd is not None
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self.fd.seek(self._blp_offsets[0])
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self.fd.seek(self._offsets[0])
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if self._blp_compression == 1:
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if self._compression == 1:
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# Uncompressed or DirectX compression
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if self._blp_encoding == Encoding.UNCOMPRESSED:
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data = self._read_bgra(palette)
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if self._encoding == Encoding.UNCOMPRESSED:
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data = self._read_bgra(palette, alpha)
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elif self._blp_encoding == Encoding.DXT:
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elif self._encoding == Encoding.DXT:
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data = bytearray()
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if self._blp_alpha_encoding == AlphaEncoding.DXT1:
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linesize = (self.size[0] + 3) // 4 * 8
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for yb in range((self.size[1] + 3) // 4):
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for d in decode_dxt1(
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self._safe_read(linesize), alpha=bool(self._blp_alpha_depth)
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):
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if self._alpha_encoding == AlphaEncoding.DXT1:
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linesize = (self.state.xsize + 3) // 4 * 8
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for yb in range((self.state.ysize + 3) // 4):
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for d in decode_dxt1(self._safe_read(linesize), alpha):
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data += d
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elif self._blp_alpha_encoding == AlphaEncoding.DXT3:
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linesize = (self.size[0] + 3) // 4 * 16
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for yb in range((self.size[1] + 3) // 4):
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elif self._alpha_encoding == AlphaEncoding.DXT3:
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linesize = (self.state.xsize + 3) // 4 * 16
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for yb in range((self.state.ysize + 3) // 4):
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for d in decode_dxt3(self._safe_read(linesize)):
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data += d
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elif self._blp_alpha_encoding == AlphaEncoding.DXT5:
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linesize = (self.size[0] + 3) // 4 * 16
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for yb in range((self.size[1] + 3) // 4):
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elif self._alpha_encoding == AlphaEncoding.DXT5:
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linesize = (self.state.xsize + 3) // 4 * 16
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for yb in range((self.state.ysize + 3) // 4):
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for d in decode_dxt5(self._safe_read(linesize)):
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data += d
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else:
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msg = f"Unsupported alpha encoding {repr(self._blp_alpha_encoding)}"
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msg = f"Unsupported alpha encoding {repr(self._alpha_encoding)}"
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raise BLPFormatError(msg)
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else:
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msg = f"Unknown BLP encoding {repr(self._blp_encoding)}"
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msg = f"Unknown BLP encoding {repr(self._encoding)}"
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raise BLPFormatError(msg)
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else:
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msg = f"Unknown BLP compression {repr(self._blp_compression)}"
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msg = f"Unknown BLP compression {repr(self._compression)}"
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raise BLPFormatError(msg)
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self.set_as_raw(data)
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@ -472,8 +475,13 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
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assert im.palette is not None
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fp.write(struct.pack("<i", 1)) # Uncompressed or DirectX compression
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alpha_depth = 1 if im.palette.mode == "RGBA" else 0
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if magic == b"BLP1":
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fp.write(struct.pack("<L", alpha_depth))
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else:
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fp.write(struct.pack("<b", Encoding.UNCOMPRESSED))
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fp.write(struct.pack("<b", 1 if im.palette.mode == "RGBA" else 0))
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fp.write(struct.pack("<b", alpha_depth))
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fp.write(struct.pack("<b", 0)) # alpha encoding
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fp.write(struct.pack("<b", 0)) # mips
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fp.write(struct.pack("<II", *im.size))
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