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290 lines
11 KiB
Python
290 lines
11 KiB
Python
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"""
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Blizzard BLP Image File Parser
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Author: Robert Xiao
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Creation date: July 10 2007
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- BLP1 File Format
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http://magos.thejefffiles.com/War3ModelEditor/MagosBlpFormat.txt
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- BLP2 File Format (Wikipedia)
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http://en.wikipedia.org/wiki/.BLP
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- S3TC (DXT1, 3, 5) Formats
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http://en.wikipedia.org/wiki/S3_Texture_Compression
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"""
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from hachoir.core.endian import LITTLE_ENDIAN
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from hachoir.field import String, UInt32, UInt8, Enum, FieldSet, RawBytes, GenericVector, Bit, Bits
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from hachoir.parser.parser import Parser
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from hachoir.parser.image.common import PaletteRGBA
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from hachoir.core.tools import alignValue
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class PaletteIndex(UInt8):
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def createDescription(self):
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return "Palette index %i (%s)" % (self.value, self["/palette/color[%i]" % self.value].description)
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class Generic2DArray(FieldSet):
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def __init__(self, parent, name, width, height, item_class, row_name="row", item_name="item", *args, **kwargs):
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FieldSet.__init__(self, parent, name, *args, **kwargs)
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self.width = width
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self.height = height
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self.item_class = item_class
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self.row_name = row_name
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self.item_name = item_name
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def createFields(self):
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for i in range(self.height):
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yield GenericVector(self, self.row_name + "[]", self.width, self.item_class, self.item_name)
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class BLP1File(Parser):
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MAGIC = b"BLP1"
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PARSER_TAGS = {
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"id": "blp1",
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"category": "game",
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"file_ext": ("blp",),
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"mime": ("application/x-blp",), # TODO: real mime type???
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"magic": ((MAGIC, 0),),
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"min_size": 7 * 32, # 7 DWORDs start, incl. magic
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"description": "Blizzard Image Format, version 1",
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}
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endian = LITTLE_ENDIAN
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def validate(self):
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if self.stream.readBytes(0, 4) != b"BLP1":
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return "Invalid magic"
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return True
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def createFields(self):
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yield String(self, "magic", 4, "Signature (BLP1)")
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yield Enum(UInt32(self, "compression"), {
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0: "JPEG Compression",
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1: "Uncompressed"})
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yield UInt32(self, "flags")
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yield UInt32(self, "width")
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yield UInt32(self, "height")
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yield Enum(UInt32(self, "type"), {
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3: "Uncompressed Index List + Alpha List",
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4: "Uncompressed Index List + Alpha List",
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5: "Uncompressed Index List"})
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yield UInt32(self, "subtype")
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for i in range(16):
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yield UInt32(self, "mipmap_offset[]")
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for i in range(16):
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yield UInt32(self, "mipmap_size[]")
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compression = self["compression"].value
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image_type = self["type"].value
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width = self["width"].value
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height = self["height"].value
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if compression == 0: # JPEG Compression
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yield UInt32(self, "jpeg_header_len")
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yield RawBytes(self, "jpeg_header", self["jpeg_header_len"].value, "Shared JPEG Header")
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else:
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yield PaletteRGBA(self, "palette", 256)
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offsets = self.array("mipmap_offset")
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sizes = self.array("mipmap_size")
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for i in range(16):
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if not offsets[i].value or not sizes[i].value:
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continue
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padding = self.seekByte(offsets[i].value)
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if padding:
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yield padding
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if compression == 0:
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yield RawBytes(self, "mipmap[%i]" % i, sizes[i].value, "JPEG data, append to header to recover complete image")
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elif compression == 1:
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yield Generic2DArray(self, "mipmap_indexes[%i]" % i, width, height, PaletteIndex, "row", "index", "Indexes into the palette")
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if image_type in (3, 4):
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yield Generic2DArray(self, "mipmap_alphas[%i]" % i, width, height, UInt8, "row", "alpha", "Alpha values")
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width /= 2
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height /= 2
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def interp_avg(data_low, data_high, n):
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"""Interpolated averages. For example,
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>>> list(interp_avg(1, 10, 3))
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[4, 7]
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"""
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if isinstance(data_low, int):
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for i in range(1, n):
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yield (data_low * (n - i) + data_high * i) / n
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else: # iterable
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pairs = list(zip(data_low, data_high))
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pair_iters = [interp_avg(x, y, n) for x, y in pairs]
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for i in range(1, n):
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yield [next(iter) for iter in pair_iters]
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def color_name(data, bits):
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"""Color names in #RRGGBB format, given the number of bits for each component."""
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ret = ["#"]
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for i in range(3):
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ret.append("%02X" % (data[i] << (8 - bits[i])))
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return ''.join(ret)
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class DXT1(FieldSet):
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static_size = 64
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def __init__(self, parent, name, dxt2_mode=False, *args, **kwargs):
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"""with dxt2_mode on, this field will always use the four color model"""
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FieldSet.__init__(self, parent, name, *args, **kwargs)
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self.dxt2_mode = dxt2_mode
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def createFields(self):
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values = [[], []]
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for i in (0, 1):
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yield Bits(self, "blue[]", 5)
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yield Bits(self, "green[]", 6)
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yield Bits(self, "red[]", 5)
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values[i] = [self["red[%i]" % i].value,
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self["green[%i]" % i].value,
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self["blue[%i]" % i].value]
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if values[0] > values[1] or self.dxt2_mode:
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values += interp_avg(values[0], values[1], 3)
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else:
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values += interp_avg(values[0], values[1], 2)
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values.append(None) # transparent
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for i in range(16):
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pixel = Bits(self, "pixel[%i][%i]" % divmod(i, 4), 2)
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color = values[pixel.value]
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if color is None:
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pixel._description = "Transparent"
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else:
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pixel._description = "RGB color: %s" % color_name(color, [
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5, 6, 5])
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yield pixel
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class DXT3Alpha(FieldSet):
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static_size = 64
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def createFields(self):
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for i in range(16):
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yield Bits(self, "alpha[%i][%i]" % divmod(i, 4), 4)
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class DXT3(FieldSet):
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static_size = 128
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def createFields(self):
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yield DXT3Alpha(self, "alpha", "Alpha Channel Data")
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yield DXT1(self, "color", True, "Color Channel Data")
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class DXT5Alpha(FieldSet):
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static_size = 64
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def createFields(self):
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values = []
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yield UInt8(self, "alpha_val[0]", "First alpha value")
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values.append(self["alpha_val[0]"].value)
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yield UInt8(self, "alpha_val[1]", "Second alpha value")
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values.append(self["alpha_val[1]"].value)
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if values[0] > values[1]:
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values += interp_avg(values[0], values[1], 7)
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else:
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values += interp_avg(values[0], values[1], 5)
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values += [0, 255]
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for i in range(16):
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pixel = Bits(self, "alpha[%i][%i]" % divmod(i, 4), 3)
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alpha = values[pixel.value]
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pixel._description = "Alpha value: %i" % alpha
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yield pixel
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class DXT5(FieldSet):
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static_size = 128
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def createFields(self):
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yield DXT5Alpha(self, "alpha", "Alpha Channel Data")
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yield DXT1(self, "color", True, "Color Channel Data")
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class BLP2File(Parser):
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MAGIC = b"BLP2"
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PARSER_TAGS = {
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"id": "blp2",
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"category": "game",
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"file_ext": ("blp",),
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"mime": ("application/x-blp",),
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"magic": ((MAGIC, 0),),
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"min_size": 5 * 32, # 5 DWORDs start, incl. magic
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"description": "Blizzard Image Format, version 2",
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}
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endian = LITTLE_ENDIAN
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def validate(self):
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if self.stream.readBytes(0, 4) != b"BLP2":
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return "Invalid magic"
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return True
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def createFields(self):
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yield String(self, "magic", 4, "Signature (BLP2)")
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yield Enum(UInt32(self, "compression", "Compression type"), {
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0: "JPEG Compressed",
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1: "Uncompressed or DXT/S3TC compressed"})
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yield Enum(UInt8(self, "encoding", "Encoding type"), {
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1: "Raw",
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2: "DXT/S3TC Texture Compression (a.k.a. DirectX)"})
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yield UInt8(self, "alpha_depth", "Alpha channel depth, in bits (0 = no alpha)")
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yield Enum(UInt8(self, "alpha_encoding", "Encoding used for alpha channel"), {
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0: "DXT1 alpha (0 or 1 bit alpha)",
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1: "DXT3 alpha (4 bit alpha)",
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7: "DXT5 alpha (8 bit interpolated alpha)"})
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yield Enum(UInt8(self, "has_mips", "Are mip levels present?"), {
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0: "No mip levels",
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1: "Mip levels present; number of levels determined by image size"})
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yield UInt32(self, "width", "Base image width")
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yield UInt32(self, "height", "Base image height")
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for i in range(16):
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yield UInt32(self, "mipmap_offset[]")
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for i in range(16):
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yield UInt32(self, "mipmap_size[]")
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yield PaletteRGBA(self, "palette", 256)
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compression = self["compression"].value
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encoding = self["encoding"].value
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alpha_depth = self["alpha_depth"].value
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alpha_encoding = self["alpha_encoding"].value
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width = self["width"].value
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height = self["height"].value
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if compression == 0: # JPEG Compression
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yield UInt32(self, "jpeg_header_len")
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yield RawBytes(self, "jpeg_header", self["jpeg_header_len"].value, "Shared JPEG Header")
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offsets = self.array("mipmap_offset")
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sizes = self.array("mipmap_size")
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for i in range(16):
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if not offsets[i].value or not sizes[i].value:
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continue
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padding = self.seekByte(offsets[i].value)
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if padding:
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yield padding
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if compression == 0:
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yield RawBytes(self, "mipmap[%i]" % i, sizes[i].value, "JPEG data, append to header to recover complete image")
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elif compression == 1 and encoding == 1:
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yield Generic2DArray(self, "mipmap_indexes[%i]" % i, height, width, PaletteIndex, "row", "index", "Indexes into the palette")
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if alpha_depth == 1:
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yield GenericVector(self, "mipmap_alphas[%i]" % i, height, width, Bit, "row", "is_opaque", "Alpha values")
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elif alpha_depth == 8:
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yield GenericVector(self, "mipmap_alphas[%i]" % i, height, width, UInt8, "row", "alpha", "Alpha values")
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elif compression == 1 and encoding == 2:
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block_height = alignValue(height, 4) // 4
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block_width = alignValue(width, 4) // 4
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if alpha_depth in [0, 1] and alpha_encoding == 0:
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yield Generic2DArray(self, "mipmap[%i]" % i, block_height, block_width, DXT1, "row", "block", "DXT1-compressed image blocks")
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elif alpha_depth == 8 and alpha_encoding == 1:
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yield Generic2DArray(self, "mipmap[%i]" % i, block_height, block_width, DXT3, "row", "block", "DXT3-compressed image blocks")
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elif alpha_depth == 8 and alpha_encoding == 7:
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yield Generic2DArray(self, "mipmap[%i]" % i, block_height, block_width, DXT5, "row", "block", "DXT5-compressed image blocks")
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width /= 2
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height /= 2
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