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54 lines
1.4 KiB
Python
54 lines
1.4 KiB
Python
from hachoir.field import FieldSet, UserVector, UInt8
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class RGB(FieldSet):
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color_name = {
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(0, 0, 0): "Black",
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(255, 0, 0): "Red",
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(0, 255, 0): "Green",
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(0, 0, 255): "Blue",
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(255, 255, 255): "White",
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}
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static_size = 24
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def createFields(self):
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yield UInt8(self, "red", "Red")
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yield UInt8(self, "green", "Green")
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yield UInt8(self, "blue", "Blue")
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def createDescription(self):
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rgb = self["red"].value, self["green"].value, self["blue"].value
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name = self.color_name.get(rgb)
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if not name:
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name = "#%02X%02X%02X" % rgb
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return "RGB color: " + name
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class RGBA(RGB):
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static_size = 32
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def createFields(self):
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yield UInt8(self, "red", "Red")
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yield UInt8(self, "green", "Green")
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yield UInt8(self, "blue", "Blue")
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yield UInt8(self, "alpha", "Alpha")
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def createDescription(self):
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description = RGB.createDescription(self)
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opacity = self["alpha"].value * 100 // 255
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return "%s (opacity: %s%%)" % (description, opacity)
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class PaletteRGB(UserVector):
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item_class = RGB
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item_name = "color"
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def createDescription(self):
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return "Palette of %u RGB colors" % len(self)
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class PaletteRGBA(PaletteRGB):
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item_class = RGBA
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def createDescription(self):
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return "Palette of %u RGBA colors" % len(self)
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