{-# LANGUAGE TupleSections #-} {-# LANGUAGE FlexibleContexts #-} -- | Module used by the jpeg decoder internally, shouldn't be used -- in user code. module Codec.Picture.Jpg.DefaultTable( DctComponent( .. ) , HuffmanTree( .. ) , MacroBlock , makeMacroBlock , buildHuffmanTree {- , defaultChromaQuantizationTable , defaultLumaQuantizationTable , defaultAcChromaHuffmanTable , defaultAcLumaHuffmanTable , defaultDcChromaHuffmanTable , defaultDcLumaHuffmanTable -} ) where import Foreign.Storable ( Storable ) import qualified Data.Vector.Storable as V import Data.Word( Word8 ) import Data.List( foldl' ) -- | Tree storing the code used for huffman encoding. data HuffmanTree = 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 deriving (Eq, Show) -- | 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 MacroBlock a = V.Vector a -- | Helper function to create pure macro block of the good size. makeMacroBlock :: (Storable a) => [a] -> MacroBlock a makeMacroBlock = V.fromListN 64 -- | Enumeration used to search in the tables for different components. data DctComponent = DcComponent | AcComponent deriving (Eq, Show) -- | Transform parsed coefficients from the jpeg header to a -- tree which can be used to decode data. buildHuffmanTree :: [[Word8]] -> HuffmanTree buildHuffmanTree table = foldl' insertHuffmanVal Empty . concatMap (\(i, t) -> map (i + 1,) t) $ zip ([0..] :: [Int]) table where isTreeFullyDefined Empty = False isTreeFullyDefined (Leaf _) = True isTreeFullyDefined (Branch l r) = isTreeFullyDefined l && isTreeFullyDefined r insertHuffmanVal Empty (0, val) = Leaf val insertHuffmanVal Empty (d, val) = Branch (insertHuffmanVal Empty (d - 1, val)) Empty insertHuffmanVal (Branch l r) (d, val) | isTreeFullyDefined l = Branch l (insertHuffmanVal r (d - 1, val)) | otherwise = Branch (insertHuffmanVal l (d - 1, val)) r insertHuffmanVal (Leaf _) _ = error "Inserting in value, shouldn't happen" {- defaultLumaQuantizationTable :: MacroBlock Int16 defaultLumaQuantizationTable = makeMacroBlock [16, 11, 10, 16, 24, 40, 51, 61 ,12, 12, 14, 19, 26, 58, 60, 55 ,14, 13, 16, 24, 40, 57, 69, 56 ,14, 17, 22, 29, 51, 87, 80, 62 ,18, 22, 37, 56, 68, 109, 103, 77 ,24, 35, 55, 64, 81, 104, 113, 92 ,49, 64, 78, 87, 103, 121, 120, 101 ,72, 92, 95, 98, 112, 100, 103, 99 ] defaultChromaQuantizationTable :: MacroBlock Int16 defaultChromaQuantizationTable = makeMacroBlock [17, 18, 24, 47, 99, 99, 99, 99 ,18, 21, 26, 66, 99, 99, 99, 99 ,24, 26, 56, 99, 99, 99, 99, 99 ,47, 66, 99, 99, 99, 99, 99, 99 ,99, 99, 99, 99, 99, 99, 99, 99 ,99, 99, 99, 99, 99, 99, 99, 99 ,99, 99, 99, 99, 99, 99, 99, 99 ,99, 99, 99, 99, 99, 99, 99, 99 ] -- | From the Table K.3 of ITU-81 (p153) defaultDcLumaHuffmanTable :: HuffmanTree defaultDcLumaHuffmanTable = buildHuffmanTree [ [] , [0] , [1, 2, 3, 4, 5] , [6] , [7] , [8] , [9] , [10] , [11] , [] , [] , [] , [] , [] , [] , [] ] -- | From the Table K.4 of ITU-81 (p153) defaultDcChromaHuffmanTable :: HuffmanTree defaultDcChromaHuffmanTable = buildHuffmanTree [ [] , [0, 1, 2] , [3] , [4] , [5] , [6] , [7] , [8] , [9] , [10] , [11] , [] , [] , [] , [] , [] ] -- | From the Table K.5 of ITU-81 (p154) defaultAcLumaHuffmanTable :: HuffmanTree defaultAcLumaHuffmanTable = buildHuffmanTree [ [] , [0x01, 0x02] , [0x03] , [0x00, 0x04, 0x11] , [0x05, 0x12, 0x21] , [0x31, 0x41] , [0x06, 0x13, 0x51, 0x61] , [0x07, 0x22, 0x71] , [0x14, 0x32, 0x81, 0x91, 0xA1] , [0x08, 0x23, 0x42, 0xB1, 0xC1] , [0x15, 0x52, 0xD1, 0xF0] , [0x24, 0x33, 0x62, 0x72] , [] , [] , [0x82] , [0x09, 0x0A, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x34, 0x35 ,0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x53, 0x54 ,0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x73 ,0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A ,0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7 ,0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4 ,0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA ,0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5 ,0xF6, 0xF7, 0xF8, 0xF9, 0xFA] ] defaultAcChromaHuffmanTable :: HuffmanTree defaultAcChromaHuffmanTable = buildHuffmanTree [ [] , [0x00, 0x01] , [0x02] , [0x03, 0x11] , [0x04, 0x05, 0x21, 0x31] , [0x06, 0x12, 0x41, 0x51] , [0x07, 0x61, 0x71] , [0x13, 0x22, 0x32, 0x81] , [0x08, 0x14, 0x42, 0x91, 0xA1, 0xB1, 0xC1] , [0x09, 0x23, 0x33, 0x52, 0xF0] , [0x15, 0x62, 0x72, 0xD1] , [0x0A, 0x16, 0x24, 0x34] , [] , [0xE1] , [0x25, 0xF1] , [ 0x17, 0x18, 0x19, 0x1A, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x35 , 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47 , 0x48, 0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59 , 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x73 , 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x82, 0x83, 0x84 , 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95 , 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6 , 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7 , 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8 , 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9 , 0xDA, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA , 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA ] ] -}