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# encoding: utf-8
"""
Constants specific the the image sub-package
"""
class JPEG_MARKER_CODE(object):
"""
JPEG marker codes
"""
TEM = b'\x01'
DHT = b'\xC4'
DAC = b'\xCC'
JPG = b'\xC8'
SOF0 = b'\xC0'
SOF1 = b'\xC1'
SOF2 = b'\xC2'
SOF3 = b'\xC3'
SOF5 = b'\xC5'
SOF6 = b'\xC6'
SOF7 = b'\xC7'
SOF9 = b'\xC9'
SOFA = b'\xCA'
SOFB = b'\xCB'
SOFD = b'\xCD'
SOFE = b'\xCE'
SOFF = b'\xCF'
RST0 = b'\xD0'
RST1 = b'\xD1'
RST2 = b'\xD2'
RST3 = b'\xD3'
RST4 = b'\xD4'
RST5 = b'\xD5'
RST6 = b'\xD6'
RST7 = b'\xD7'
SOI = b'\xD8'
EOI = b'\xD9'
SOS = b'\xDA'
DQT = b'\xDB' # Define Quantization Table(s)
DNL = b'\xDC'
DRI = b'\xDD'
DHP = b'\xDE'
EXP = b'\xDF'
APP0 = b'\xE0'
APP1 = b'\xE1'
APP2 = b'\xE2'
APP3 = b'\xE3'
APP4 = b'\xE4'
APP5 = b'\xE5'
APP6 = b'\xE6'
APP7 = b'\xE7'
APP8 = b'\xE8'
APP9 = b'\xE9'
APPA = b'\xEA'
APPB = b'\xEB'
APPC = b'\xEC'
APPD = b'\xED'
APPE = b'\xEE'
APPF = b'\xEF'
STANDALONE_MARKERS = (
TEM, SOI, EOI, RST0, RST1, RST2, RST3, RST4, RST5, RST6, RST7
)
SOF_MARKER_CODES = (
SOF0, SOF1, SOF2, SOF3, SOF5, SOF6, SOF7, SOF9, SOFA, SOFB, SOFD,
SOFE, SOFF
)
marker_names = {
b'\x00': 'UNKNOWN',
b'\xC0': 'SOF0',
b'\xC2': 'SOF2',
b'\xC4': 'DHT',
b'\xDA': 'SOS', # start of scan
b'\xD8': 'SOI', # start of image
b'\xD9': 'EOI', # end of image
b'\xDB': 'DQT',
b'\xE0': 'APP0',
b'\xE1': 'APP1',
b'\xE2': 'APP2',
b'\xED': 'APP13',
b'\xEE': 'APP14',
}
@classmethod
def is_standalone(cls, marker_code):
return marker_code in cls.STANDALONE_MARKERS
class MIME_TYPE(object):
"""
Image content types
"""
BMP = 'image/bmp'
GIF = 'image/gif'
JPEG = 'image/jpeg'
PNG = 'image/png'
TIFF = 'image/tiff'
class PNG_CHUNK_TYPE(object):
"""
PNG chunk type names
"""
IHDR = 'IHDR'
pHYs = 'pHYs'
IEND = 'IEND'
class TIFF_FLD_TYPE(object):
"""
Tag codes for TIFF Image File Directory (IFD) entries.
"""
BYTE = 1
ASCII = 2
SHORT = 3
LONG = 4
RATIONAL = 5
field_type_names = {
1: 'BYTE', 2: 'ASCII char', 3: 'SHORT', 4: 'LONG',
5: 'RATIONAL'
}
TIFF_FLD = TIFF_FLD_TYPE
class TIFF_TAG(object):
"""
Tag codes for TIFF Image File Directory (IFD) entries.
"""
IMAGE_WIDTH = 0x0100
IMAGE_LENGTH = 0x0101
X_RESOLUTION = 0x011A
Y_RESOLUTION = 0x011B
RESOLUTION_UNIT = 0x0128
tag_names = {
0x00FE: 'NewSubfileType',
0x0100: 'ImageWidth',
0x0101: 'ImageLength',
0x0102: 'BitsPerSample',
0x0103: 'Compression',
0x0106: 'PhotometricInterpretation',
0x010E: 'ImageDescription',
0x010F: 'Make',
0x0110: 'Model',
0x0111: 'StripOffsets',
0x0112: 'Orientation',
0x0115: 'SamplesPerPixel',
0x0117: 'StripByteCounts',
0x011A: 'XResolution',
0x011B: 'YResolution',
0x011C: 'PlanarConfiguration',
0x0128: 'ResolutionUnit',
0x0131: 'Software',
0x0132: 'DateTime',
0x0213: 'YCbCrPositioning',
0x8769: 'ExifTag',
0x8825: 'GPS IFD',
0xC4A5: 'PrintImageMatching',
}
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