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73 lines
2.7 KiB
Python
73 lines
2.7 KiB
Python
"""
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PCX picture filter.
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"""
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from hachoir.parser import Parser
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from hachoir.field import (
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UInt8, UInt16,
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PaddingBytes, RawBytes,
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Enum)
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from hachoir.parser.image.common import PaletteRGB
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from hachoir.core.endian import LITTLE_ENDIAN
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class PcxFile(Parser):
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endian = LITTLE_ENDIAN
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PARSER_TAGS = {
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"id": "pcx",
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"category": "image",
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"file_ext": ("pcx",),
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"mime": ("image/x-pcx",),
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"min_size": 128 * 8,
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"description": "PC Paintbrush (PCX) picture"
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}
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compression_name = {1: "Run-length encoding (RLE)"}
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version_name = {
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0: "Version 2.5 of PC Paintbrush",
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2: "Version 2.8 with palette information",
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3: "Version 2.8 without palette information",
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4: "PC Paintbrush for Windows",
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5: "Version 3.0 (or greater) of PC Paintbrush"
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}
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def validate(self):
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if self["id"].value != 10:
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return "Wrong signature"
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if self["version"].value not in self.version_name:
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return "Unknown format version"
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if self["bpp"].value not in (1, 2, 4, 8, 24, 32):
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return "Unknown bits/pixel"
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if self["reserved[0]"].value != b"\0":
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return "Invalid reserved value"
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return True
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def createFields(self):
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yield UInt8(self, "id", "PCX identifier (10)")
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yield Enum(UInt8(self, "version", "PCX version"), self.version_name)
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yield Enum(UInt8(self, "compression", "Compression method"), self.compression_name)
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yield UInt8(self, "bpp", "Bits / pixel")
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yield UInt16(self, "xmin", "Minimum X")
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yield UInt16(self, "ymin", "Minimum Y")
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yield UInt16(self, "xmax", "Width minus one") # value + 1
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yield UInt16(self, "ymax", "Height minus one") # value + 1
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yield UInt16(self, "horiz_dpi", "Horizontal DPI")
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yield UInt16(self, "vert_dpi", "Vertical DPI")
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yield PaletteRGB(self, "palette_4bits", 16, "Palette (4 bits)")
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yield PaddingBytes(self, "reserved[]", 1)
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yield UInt8(self, "nb_color_plan", "Number of color plans")
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yield UInt16(self, "bytes_per_line", "Bytes per line")
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yield UInt16(self, "color_mode", "Color mode")
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yield PaddingBytes(self, "reserved[]", 58)
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if self._size is None: # TODO: is it possible to handle piped input?
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raise NotImplementedError
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nb_colors = 256
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size = (self._size - self.current_size) // 8
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has_palette = self["bpp"].value == 8
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if has_palette:
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size -= nb_colors * 3
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yield RawBytes(self, "image_data", size, "Image data")
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if has_palette:
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yield PaletteRGB(self, "palette_8bits", nb_colors, "Palette (8 bit)")
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