ImageReader subclass:#FLIReader

	instanceVariableNames:'frames nframes frameBuffer frameBufferSize imageBuffer redPalette

		greenPalette bluePalette flags frameDelay'

	classVariableNames:'FLI_FILE_MAGIC FLC_FILE_MAGIC FLI_FRAME_MAGIC FILE_HEAD_SIZE

		FRAME_HEAD_SIZE CHUNK_HEAD_SIZE FLI_256_COLOR FLI_DELTA FLI_COLOR

		FLI_LC FLI_BLACK FLI_BRUN FLI_COPY FLI_MINI MAXCOLORS'

	poolDictionaries:''

	category:'Graphics-Images-Support'

!

!FLIReader class methodsFor:'documentation'!

documentation

"

    Read frames from a FLI/FLC file.

    this is a very first attempt in reading FLI files;

    its very experimental and may change.

    (will introduce a new class hierarchy based upon

     MovieReader ...).

    When used like an imageReader, #fromFile: will return

    the very first frame.

    Warning: right now, the complete movie is read and huge

    amounts of memoru are allocated. The interface will be changed

    to allow stream operation ...

    [author:]

        Claus Gittinger

    [see also:]

        ImageReader

"

!

examples

"

    |reader film view tNext|

    reader := FLIReader readFile:'/usr/local/FLI/jeffmild.fli'.

    reader isNil ifTrue:[^ nil].

    film := reader images.

    view := StandardSystemView extent:(film first extent).

    view openAndWait.

    tNext := Time millisecondClockValue + (reader frameDelay).

    film do:[:frame |

        frame displayOn:view x:0 y:0.

        (Delay untilMilliseconds:tNext) wait.

        tNext := tNext + (reader frameDelay).

    ].

"

! !

!FLIReader class methodsFor:'class initialization'!

initialize

    FLI_FILE_MAGIC := 16rAF11.

    FLC_FILE_MAGIC := 16rAF12.

    FLI_FRAME_MAGIC := 16rF1FA.

    FILE_HEAD_SIZE := 128.

    FRAME_HEAD_SIZE := 16.

    CHUNK_HEAD_SIZE := 6.

    FLI_256_COLOR := 4.

    FLI_DELTA := 7.

    FLI_COLOR := 11.

    FLI_LC  := 12.

    FLI_BLACK := 13.

    FLI_BRUN := 15.

    FLI_COPY := 16.

    FLI_MINI := 18.

    MAXCOLORS := 256.

    "

     FLIReader initialize

    "

    "Modified: 4.4.1997 / 22:19:45 / cg"

! !

!FLIReader class methodsFor:'testing'!

isValidImageFile:aFileName

    "return true, if aFileName contains an FLI/FLC-movie"

    |header n inStream len type|

    inStream := self streamReadingFile:aFileName.

    inStream isNil ifTrue:[^ false].

    header := ByteArray new:FILE_HEAD_SIZE.

    n := inStream nextBytes:FILE_HEAD_SIZE into:header.

    inStream close.

    n ~~ FILE_HEAD_SIZE ifTrue:[^ false].

    len := header doubleWordAt:(1+0).

    type := header wordAt:(1+4).

    type ~~ FLI_FILE_MAGIC ifTrue:[

        type ~~ FLC_FILE_MAGIC ifTrue:[

            ^ false

        ]

    ].

    ^ true

    "

     FLIReader isValidImageFile:'bitmaps/magtape.xpm'    

     FLIReader isValidImageFile:'/usr/local/FLI/jeffmild.fli'      

    "

    "Modified: 4.4.1997 / 22:30:19 / cg"

! !

!FLIReader methodsFor:'accessing'!

frameDelay

    "return the value of the instance variable 'frameDelay' (automatically generated)"

    ^ frameDelay

    "Created: 4.4.1997 / 21:59:02 / cg"

!

hasMultipleImages

    ^ frames size > 1

    "Created: 4.4.1997 / 21:39:25 / cg"

    "Modified: 4.4.1997 / 21:42:59 / cg"

!

images

    "return a collection of all images as represented by myself"

    |images image depth|

    depth := self bitsPerPixel.

    images := OrderedCollection new.

    frames do:[:aFrame |

        image := (Image implementorForDepth:depth) new.

        image 

            width:width 

            height:height

            photometric:photometric

            samplesPerPixel:samplesPerPixel

            bitsPerSample:bitsPerSample

            colorMap:colorMap

            bits:aFrame

            mask:mask.

        images add:image.

    ].

    ^ images

    "Modified: 20.6.1996 / 17:09:04 / cg"

    "Created: 4.4.1997 / 21:44:44 / cg"

! !

!FLIReader methodsFor:'processing chunks'!

brunChunkAt:chunkOffs

    |offs lineIdx nextLineIdx packets sz|

    imageBuffer := ByteArray uninitializedNew:(width*height).

    offs := chunkOffs.

    lineIdx := 1.

    1 to:height do:[:y |

        nextLineIdx := lineIdx + width.

        packets := frameBuffer byteAt:offs. offs := offs + 1.

        1 to:packets do:[:p |

            sz := frameBuffer signedByteAt:offs. offs := offs + 1.

            sz > 0 ifTrue:[

                data := frameBuffer at:offs. offs := offs + 1.

                imageBuffer from:lineIdx to:(lineIdx+sz-1) put:data.

            ] ifFalse:[

                sz == 0 ifTrue:[    

                    self halt:'error in brun chunk'.

                    ^ self.

                ].

                sz := sz negated.

                imageBuffer replaceFrom:lineIdx to:(lineIdx+sz-1) 

                            with:frameBuffer startingAt:offs.

                offs := offs + sz.

            ].

            lineIdx := lineIdx + sz.

        ].

        lineIdx := nextLineIdx

    ].

    frames add:imageBuffer.

    "

     FLIReader imagesFromFile:'/usr/local/FLI/jeffmild.fli'      

    "

!

color256ChunkAt:chunkOffs

    self colorChunkAt:chunkOffs shift:0

!

color64ChunkAt:chunkOffs

    self colorChunkAt:chunkOffs shift:2

!

colorChunkAt:chunkOffs shift:colorShift

    |b0 b1 packets offs ic skip change red green blue|

    offs := chunkOffs.

    packets := frameBuffer wordAt:offs. offs := offs + 2.

    ic := 0.

    1 to:packets do:[:i |

        skip := frameBuffer byteAt:offs. offs := offs + 1.   

        ic := ic + skip.

        ic := ic \\ MAXCOLORS.

        change := frameBuffer byteAt:offs. offs := offs + 1.

        change == 0 ifTrue:[change := 256].

        1 to:change do:[:n |

            red := frameBuffer at:offs. offs := offs + 1.

            green := frameBuffer at:offs. offs := offs + 1.

            blue := frameBuffer at:offs. offs := offs + 1.

            red := red bitShift:colorShift.

            green := green bitShift:colorShift.

            blue := blue bitShift:colorShift.

"/ red print. ' ' print. green print. ' ' print. blue printCR.

            redPalette at:(ic + 1) put:red.

            greenPalette at:(ic + 1) put:green.

            bluePalette at:(ic + 1) put:blue.

            ic := ic + 1.

        ]

    ].

    "

     FLIReader fromFile:'/usr/local/FLI/jeffmild.fli'      

    "

!

deltaChunkAt:chunkOffs

!

lcChunkAt:chunkOffs

    |jnext lines lineCnt offs lineIdx packets idx skip sz|

    imageBuffer := imageBuffer copyFrom:1 to:(width*height).

    offs := chunkOffs.

    jnext := frameBuffer wordAt:offs. offs := offs + 2.

    lines := frameBuffer wordAt:offs. offs := offs + 2.

    lineCnt := 0.

    lineIdx := 1.

    0 to:height-1 do:[:row |

        lineCnt >= lines ifTrue:[

            frames add:imageBuffer.

            ^ self

        ].

        row < jnext ifFalse:[

            packets := frameBuffer byteAt:offs. offs := offs + 1.

            lineCnt := lineCnt + 1.

            idx := lineIdx.

            1 to:packets do:[:p |

                skip := frameBuffer byteAt:offs. offs := offs + 1.

                idx := idx + skip.

                sz := frameBuffer signedByteAt:offs. offs := offs + 1.

                sz > 0 ifTrue:[

                    imageBuffer replaceFrom:idx to:(idx+sz-1) 

                                with:frameBuffer startingAt:offs.

                    offs := offs + sz.

                ] ifFalse:[

                    sz < 0 ifTrue:[

                        sz := sz negated.

                        data := frameBuffer at:offs. offs := offs + 1.

                        imageBuffer from:idx to:(idx+sz-1) put:data.

                    ]

                ].

                idx := idx + sz.

            ].

        ].

        lineIdx := lineIdx + width

    ].

    frames add:imageBuffer.

!

processChunks:nchunks size:dataLen

    "process chunks in a frame"

    |len type offs chunkOffs|

    offs := 1+0.

    1 to:nchunks do:[:chunkIndex |

        len := frameBuffer doubleWordAt:(offs+0).

        type := frameBuffer wordAt:(offs+4).

        chunkOffs := offs + CHUNK_HEAD_SIZE.

        type == FLI_COLOR ifTrue:[

            self color64ChunkAt:chunkOffs.

        ] ifFalse:[

            type == FLI_256_COLOR ifTrue:[

                self color256ChunkAt:chunkOffs.

            ] ifFalse:[

                type == FLI_DELTA ifTrue:[

                    self deltaChunkAt:chunkOffs.

                ] ifFalse:[

                    type == FLI_LC ifTrue:[

                        self lcChunkAt:chunkOffs.

                    ] ifFalse:[

                        type == FLI_BRUN ifTrue:[

                            self brunChunkAt:chunkOffs.

                        ] ifFalse:[

                            'FLI [info]: unknown chunk type: ' infoPrint.

                            type hexPrintString infoPrintCR.

                            ^ false.

                        ]

                    ]

                ]

            ].

        ].

        offs := offs + len

    ].

    "

     FLIReader fromFile:'/usr/local/FLI/jeffmild.fli'      

    "

    "Created: 3.4.1997 / 22:28:11 / cg"

    "Modified: 3.4.1997 / 22:52:38 / cg"

! !

!FLIReader methodsFor:'reading from stream'!

fromStream:aStream

    inStream := aStream.

    (self getHeader) ifFalse:[^ nil].

    1 to:nframes do:[:frameIndex |

        self getFrame

    ].

    "/ return the first frame as image

    colorMap := Colormap 

                    redVector:redPalette 

                    greenVector:greenPalette 

                    blueVector:bluePalette.

    photometric := #palette.

    samplesPerPixel := 1.

    bitsPerSample := #(8).

    data := frames at:1.

    "

     FLIReader fromFile:'/usr/local/FLI/jeffmild.fli'      

    "

!

getFrame

    "get a single frame"

    |header n len type dataLen nchunks|

    header := ByteArray new:FRAME_HEAD_SIZE.

    n := inStream nextBytes:FRAME_HEAD_SIZE into:header.

    n ~~ FRAME_HEAD_SIZE ifTrue:[^ false].

    len := header doubleWordAt:(1+0).

    type := header wordAt:(1+4).

    type ~~ FLI_FRAME_MAGIC ifTrue:[^ false].

    dataLen := len - FRAME_HEAD_SIZE.

    dataLen > frameBufferSize ifTrue:[

        frameBuffer := ByteArray uninitializedNew:dataLen.

        frameBufferSize := dataLen.

    ].

    n := inStream nextBytes:dataLen into:frameBuffer.

    n ~~ dataLen ifTrue:[^ false].

    nchunks := header wordAt:(1+6).

    nchunks == 0 ifTrue:[

        "/ mhmh - a timing frame; should add a dummy frame

        ^ self.

    ].     

    ^ self processChunks:nchunks size:dataLen.

    "

     FLIReader fromFile:'bitmaps/magtape.xpm'    

     FLIReader fromFile:'/usr/local/FLI/jeffmild.fli'      

    "

    "Created: 3.4.1997 / 22:15:19 / cg"

    "Modified: 4.4.1997 / 22:18:21 / cg"

!

getHeader

    |header n len type speed|

    header := ByteArray new:FILE_HEAD_SIZE.

    n := inStream nextBytes:FILE_HEAD_SIZE into:header.

    n ~~ FILE_HEAD_SIZE ifTrue:[^ false].

    len := header doubleWordAt:(1+0).

    type := header wordAt:(1+4).

    type ~~ FLI_FILE_MAGIC ifTrue:[

        type ~~ FLC_FILE_MAGIC ifTrue:[

            ^ false

        ]

    ].

    nframes := header wordAt:(1+6).

    width := header wordAt:(1+8).

    height := header wordAt:(1+10).

    dimensionCallBack notNil ifTrue:[

        dimensionCallBack value

    ].

    flags := header wordAt:(1+14).

    speed := header wordAt:(1+16).

    speed <= 0 ifTrue:[

        speed := 1

    ].

    "/ FLI uses 1/70th of a second;

    "/ FLC measures the frameDelay in milliseconds

    type == FLI_FILE_MAGIC ifTrue:[

        frameDelay := 1000 * speed // 70

    ] ifFalse:[

        frameDelay := speed

    ].

    frameBufferSize := width * height.

    frameBuffer := ByteArray uninitializedNew:frameBufferSize.

    redPalette := ByteArray new:256.

    greenPalette := ByteArray new:256.

    bluePalette := ByteArray new:256.

    frames := OrderedCollection new:nframes.

    ^ true

    "

     FLIReader fromFile:'bitmaps/magtape.xpm'    

     FLIReader fromFile:'/usr/local/FLI/jeffmild.fli'      

    "

    "Created: 3.4.1997 / 22:09:12 / cg"

! !

!FLIReader class methodsFor:'documentation'!

version

! !

FLIReader initialize!