173 lines
3.4 KiB
Python
173 lines
3.4 KiB
Python
"""Constants specific the the image sub-package."""
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class JPEG_MARKER_CODE:
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"""JPEG marker codes."""
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TEM = b"\x01"
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DHT = b"\xC4"
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DAC = b"\xCC"
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JPG = b"\xC8"
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SOF0 = b"\xC0"
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SOF1 = b"\xC1"
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SOF2 = b"\xC2"
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SOF3 = b"\xC3"
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SOF5 = b"\xC5"
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SOF6 = b"\xC6"
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SOF7 = b"\xC7"
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SOF9 = b"\xC9"
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SOFA = b"\xCA"
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SOFB = b"\xCB"
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SOFD = b"\xCD"
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SOFE = b"\xCE"
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SOFF = b"\xCF"
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RST0 = b"\xD0"
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RST1 = b"\xD1"
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RST2 = b"\xD2"
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RST3 = b"\xD3"
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RST4 = b"\xD4"
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RST5 = b"\xD5"
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RST6 = b"\xD6"
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RST7 = b"\xD7"
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SOI = b"\xD8"
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EOI = b"\xD9"
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SOS = b"\xDA"
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DQT = b"\xDB" # Define Quantization Table(s)
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DNL = b"\xDC"
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DRI = b"\xDD"
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DHP = b"\xDE"
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EXP = b"\xDF"
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APP0 = b"\xE0"
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APP1 = b"\xE1"
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APP2 = b"\xE2"
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APP3 = b"\xE3"
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APP4 = b"\xE4"
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APP5 = b"\xE5"
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APP6 = b"\xE6"
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APP7 = b"\xE7"
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APP8 = b"\xE8"
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APP9 = b"\xE9"
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APPA = b"\xEA"
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APPB = b"\xEB"
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APPC = b"\xEC"
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APPD = b"\xED"
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APPE = b"\xEE"
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APPF = b"\xEF"
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STANDALONE_MARKERS = (TEM, SOI, EOI, RST0, RST1, RST2, RST3, RST4, RST5, RST6, RST7)
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SOF_MARKER_CODES = (
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SOF0,
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SOF1,
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SOF2,
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SOF3,
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SOF5,
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SOF6,
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SOF7,
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SOF9,
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SOFA,
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SOFB,
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SOFD,
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SOFE,
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SOFF,
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)
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marker_names = {
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b"\x00": "UNKNOWN",
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b"\xC0": "SOF0",
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b"\xC2": "SOF2",
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b"\xC4": "DHT",
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b"\xDA": "SOS", # start of scan
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b"\xD8": "SOI", # start of image
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b"\xD9": "EOI", # end of image
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b"\xDB": "DQT",
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b"\xE0": "APP0",
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b"\xE1": "APP1",
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b"\xE2": "APP2",
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b"\xED": "APP13",
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b"\xEE": "APP14",
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}
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@classmethod
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def is_standalone(cls, marker_code):
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return marker_code in cls.STANDALONE_MARKERS
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class MIME_TYPE:
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"""Image content types."""
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BMP = "image/bmp"
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GIF = "image/gif"
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JPEG = "image/jpeg"
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PNG = "image/png"
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TIFF = "image/tiff"
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class PNG_CHUNK_TYPE:
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"""PNG chunk type names."""
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IHDR = "IHDR"
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pHYs = "pHYs"
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IEND = "IEND"
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class TIFF_FLD_TYPE:
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"""Tag codes for TIFF Image File Directory (IFD) entries."""
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BYTE = 1
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ASCII = 2
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SHORT = 3
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LONG = 4
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RATIONAL = 5
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field_type_names = {
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1: "BYTE",
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2: "ASCII char",
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3: "SHORT",
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4: "LONG",
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5: "RATIONAL",
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}
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TIFF_FLD = TIFF_FLD_TYPE
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class TIFF_TAG:
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"""Tag codes for TIFF Image File Directory (IFD) entries."""
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IMAGE_WIDTH = 0x0100
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IMAGE_LENGTH = 0x0101
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X_RESOLUTION = 0x011A
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Y_RESOLUTION = 0x011B
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RESOLUTION_UNIT = 0x0128
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tag_names = {
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0x00FE: "NewSubfileType",
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0x0100: "ImageWidth",
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0x0101: "ImageLength",
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0x0102: "BitsPerSample",
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0x0103: "Compression",
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0x0106: "PhotometricInterpretation",
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0x010E: "ImageDescription",
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0x010F: "Make",
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0x0110: "Model",
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0x0111: "StripOffsets",
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0x0112: "Orientation",
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0x0115: "SamplesPerPixel",
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0x0117: "StripByteCounts",
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0x011A: "XResolution",
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0x011B: "YResolution",
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0x011C: "PlanarConfiguration",
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0x0128: "ResolutionUnit",
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0x0131: "Software",
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0x0132: "DateTime",
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0x0213: "YCbCrPositioning",
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0x8769: "ExifTag",
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0x8825: "GPS IFD",
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0xC4A5: "PrintImageMatching",
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}
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