86 lines
2.9 KiB
Python
86 lines
2.9 KiB
Python
"""
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Truevision Targa Graphic (TGA) picture parser.
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Author: Victor Stinner
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Creation: 18 december 2006
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"""
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from lib.hachoir_parser import Parser
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from lib.hachoir_core.field import FieldSet, UInt8, UInt16, Enum, RawBytes
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from lib.hachoir_core.endian import LITTLE_ENDIAN
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from lib.hachoir_parser.image.common import PaletteRGB
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class Line(FieldSet):
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def __init__(self, *args):
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FieldSet.__init__(self, *args)
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self._size = self["/width"].value * self["/bpp"].value
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def createFields(self):
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for x in xrange(self["/width"].value):
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yield UInt8(self, "pixel[]")
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class Pixels(FieldSet):
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def __init__(self, *args):
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FieldSet.__init__(self, *args)
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self._size = self["/width"].value * self["/height"].value * self["/bpp"].value
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def createFields(self):
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if self["/options"].value == 0:
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RANGE = xrange(self["/height"].value-1,-1,-1)
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else:
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RANGE = xrange(self["/height"].value)
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for y in RANGE:
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yield Line(self, "line[%u]" % y)
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class TargaFile(Parser):
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PARSER_TAGS = {
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"id": "targa",
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"category": "image",
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"file_ext": ("tga",),
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"mime": (u"image/targa", u"image/tga", u"image/x-tga"),
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"min_size": 18*8,
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"description": u"Truevision Targa Graphic (TGA)"
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}
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CODEC_NAME = {
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1: u"8-bit uncompressed",
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2: u"24-bit uncompressed",
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9: u"8-bit RLE",
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10: u"24-bit RLE",
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}
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endian = LITTLE_ENDIAN
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def validate(self):
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if self["version"].value != 1:
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return "Unknown version"
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if self["codec"].value not in self.CODEC_NAME:
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return "Unknown codec"
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if self["x_min"].value != 0 or self["y_min"].value != 0:
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return "(x_min, y_min) is not (0,0)"
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if self["bpp"].value not in (8, 24):
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return "Unknown bits/pixel value"
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return True
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def createFields(self):
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yield UInt8(self, "hdr_size", "Header size in bytes")
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yield UInt8(self, "version", "Targa version (always one)")
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yield Enum(UInt8(self, "codec", "Pixels encoding"), self.CODEC_NAME)
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yield UInt16(self, "palette_ofs", "Palette absolute file offset")
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yield UInt16(self, "nb_color", "Number of color")
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yield UInt8(self, "color_map_size", "Color map entry size")
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yield UInt16(self, "x_min")
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yield UInt16(self, "y_min")
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yield UInt16(self, "width")
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yield UInt16(self, "height")
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yield UInt8(self, "bpp", "Bits per pixel")
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yield UInt8(self, "options", "Options (0: vertical mirror)")
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if self["bpp"].value == 8:
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yield PaletteRGB(self, "palette", 256)
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if self["codec"].value == 1:
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yield Pixels(self, "pixels")
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else:
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size = (self.size - self.current_size) // 8
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if size:
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yield RawBytes(self, "raw_pixels", size)
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