Codec.Picture.Jpg.Internal.DefaultTable

Module used by the jpeg decoder internally, shouldn't be used in user code.

Documentation

data DctComponent

Enumeration used to search in the tables for different components.

Constructors

DcComponent

AcComponent

Instances

Eq DctComponent

Defined in Codec.Picture.Jpg.Internal.DefaultTable

Methods

(==) :: DctComponent -> DctComponent -> Bool

(/=) :: DctComponent -> DctComponent -> Bool

Show DctComponent

Defined in Codec.Picture.Jpg.Internal.DefaultTable

Methods

showsPrec :: Int -> DctComponent -> ShowS

show :: DctComponent -> String

showList :: [DctComponent] -> ShowS

data HuffmanTree

Tree storing the code used for huffman encoding.

Constructors

Branch HuffmanTree HuffmanTree

If bit is 0 take the first subtree, if 1, the right.

Leaf Word8

We should output the value

Empty

no value present

Instances

Eq HuffmanTree

Defined in Codec.Picture.Jpg.Internal.DefaultTable

Methods

(==) :: HuffmanTree -> HuffmanTree -> Bool

(/=) :: HuffmanTree -> HuffmanTree -> Bool

Show HuffmanTree

Defined in Codec.Picture.Jpg.Internal.DefaultTable

Methods

showsPrec :: Int -> HuffmanTree -> ShowS

show :: HuffmanTree -> String

showList :: [HuffmanTree] -> ShowS

type HuffmanTable = [[Word8]]

type HuffmanPackedTree = Vector Word16

type MacroBlock a = Vector a

Represent a compact array of 8 * 8 values. The size is not guarenteed by type system, but if makeMacroBlock is used, everything should be fine size-wise

type QuantificationTable = MacroBlock Int16

type HuffmanWriterCode = Vector (Word8, Word16)

scaleQuantisationMatrix :: Int -> QuantificationTable -> QuantificationTable

makeMacroBlock :: Storable a => [a] -> MacroBlock a

Helper function to create pure macro block of the good size.

makeInverseTable :: HuffmanTree -> HuffmanWriterCode

buildHuffmanTree :: [[Word8]] -> HuffmanTree

Transform parsed coefficients from the jpeg header to a tree which can be used to decode data.

packHuffmanTree :: HuffmanTree -> HuffmanPackedTree

huffmanPackedDecode :: HuffmanPackedTree -> BoolReader s Word8

defaultChromaQuantizationTable :: QuantificationTable

defaultLumaQuantizationTable :: QuantificationTable

defaultAcChromaHuffmanTree :: HuffmanTree

defaultAcChromaHuffmanTable :: HuffmanTable

defaultAcLumaHuffmanTree :: HuffmanTree

defaultAcLumaHuffmanTable :: HuffmanTable

From the Table K.5 of ITU-81 (p154)

defaultDcChromaHuffmanTree :: HuffmanTree

defaultDcChromaHuffmanTable :: HuffmanTable

From the Table K.4 of ITU-81 (p153)

defaultDcLumaHuffmanTree :: HuffmanTree

defaultDcLumaHuffmanTable :: HuffmanTable

From the Table K.3 of ITU-81 (p153)