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-rw-r--r--vendor/golang.org/x/image/tiff/consts.go133
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diff --git a/vendor/golang.org/x/image/tiff/consts.go b/vendor/golang.org/x/image/tiff/consts.go
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-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package tiff
-
-// A tiff image file contains one or more images. The metadata
-// of each image is contained in an Image File Directory (IFD),
-// which contains entries of 12 bytes each and is described
-// on page 14-16 of the specification. An IFD entry consists of
-//
-// - a tag, which describes the signification of the entry,
-// - the data type and length of the entry,
-// - the data itself or a pointer to it if it is more than 4 bytes.
-//
-// The presence of a length means that each IFD is effectively an array.
-
-const (
- leHeader = "II\x2A\x00" // Header for little-endian files.
- beHeader = "MM\x00\x2A" // Header for big-endian files.
-
- ifdLen = 12 // Length of an IFD entry in bytes.
-)
-
-// Data types (p. 14-16 of the spec).
-const (
- dtByte = 1
- dtASCII = 2
- dtShort = 3
- dtLong = 4
- dtRational = 5
-)
-
-// The length of one instance of each data type in bytes.
-var lengths = [...]uint32{0, 1, 1, 2, 4, 8}
-
-// Tags (see p. 28-41 of the spec).
-const (
- tImageWidth = 256
- tImageLength = 257
- tBitsPerSample = 258
- tCompression = 259
- tPhotometricInterpretation = 262
-
- tStripOffsets = 273
- tSamplesPerPixel = 277
- tRowsPerStrip = 278
- tStripByteCounts = 279
-
- tTileWidth = 322
- tTileLength = 323
- tTileOffsets = 324
- tTileByteCounts = 325
-
- tXResolution = 282
- tYResolution = 283
- tResolutionUnit = 296
-
- tPredictor = 317
- tColorMap = 320
- tExtraSamples = 338
- tSampleFormat = 339
-)
-
-// Compression types (defined in various places in the spec and supplements).
-const (
- cNone = 1
- cCCITT = 2
- cG3 = 3 // Group 3 Fax.
- cG4 = 4 // Group 4 Fax.
- cLZW = 5
- cJPEGOld = 6 // Superseded by cJPEG.
- cJPEG = 7
- cDeflate = 8 // zlib compression.
- cPackBits = 32773
- cDeflateOld = 32946 // Superseded by cDeflate.
-)
-
-// Photometric interpretation values (see p. 37 of the spec).
-const (
- pWhiteIsZero = 0
- pBlackIsZero = 1
- pRGB = 2
- pPaletted = 3
- pTransMask = 4 // transparency mask
- pCMYK = 5
- pYCbCr = 6
- pCIELab = 8
-)
-
-// Values for the tPredictor tag (page 64-65 of the spec).
-const (
- prNone = 1
- prHorizontal = 2
-)
-
-// Values for the tResolutionUnit tag (page 18).
-const (
- resNone = 1
- resPerInch = 2 // Dots per inch.
- resPerCM = 3 // Dots per centimeter.
-)
-
-// imageMode represents the mode of the image.
-type imageMode int
-
-const (
- mBilevel imageMode = iota
- mPaletted
- mGray
- mGrayInvert
- mRGB
- mRGBA
- mNRGBA
-)
-
-// CompressionType describes the type of compression used in Options.
-type CompressionType int
-
-const (
- Uncompressed CompressionType = iota
- Deflate
-)
-
-// specValue returns the compression type constant from the TIFF spec that
-// is equivalent to c.
-func (c CompressionType) specValue() uint32 {
- switch c {
- case Deflate:
- return cDeflate
- }
- return cNone
-}