author | Claus Gittinger <cg@exept.de> |
Tue, 24 Jun 1997 15:30:20 +0200 | |
changeset 618 | ab83e72fd105 |
parent 563 | 38cbee875bfa |
child 619 | 395cc493a341 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1991 by Claus Gittinger |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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ImageReader subclass:#GIFReader |
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instanceVariableNames:'redMap greenMap blueMap maskPixelValue' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'Graphics-Images-Support' |
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! |
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||
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!GIFReader class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1991 by Claus Gittinger |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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! |
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||
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documentation |
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" |
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this class provides methods for loading and saving GIF pictures. |
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It has been tested with some different GIF87a pictures, I dont |
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know, if it works with other GIF versions. |
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GIF extension blocks are not handled. |
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GIF file writing is not implemented (use TIFF). |
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legal stuff extracted from GIF87a documentation: |
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CompuServe Incorporated hereby grants a limited, non-exclusive, royalty-free |
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license for the use of the Graphics Interchange Format(sm) in computer |
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software; computer software utilizing GIF(sm) must acknowledge ownership of the |
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Graphics Interchange Format and its Service Mark by CompuServe Incorporated, in |
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User and Technical Documentation. |
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The Graphics Interchange Format(c) is the Copyright property of |
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CompuServe Incorporated. GIF(sm) is a Service Mark property of |
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CompuServe Incorporated. |
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[See also:] |
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Image Form Icon |
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BlitImageReader FaceReader JPEGReader PBMReader PCXReader |
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ST80FormReader SunRasterReader TargaReader TIFFReader WindowsIconReader |
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XBMReader XPMReader XWDReader |
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[author:] |
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Claus Gittinger |
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" |
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! ! |
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!GIFReader class methodsFor:'initialization'! |
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initialize |
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"install myself in the Image classes fileFormat table |
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for the `.gif' extensions." |
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Image addReader:self suffix:'gif'. |
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"Modified: 1.2.1997 / 14:59:37 / cg" |
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! ! |
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!GIFReader class methodsFor:'testing'! |
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isValidImageFile:aFileName |
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"return true, if aFileName contains a GIF image" |
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|id inStream| |
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inStream := self streamReadingFile:aFileName. |
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inStream isNil ifTrue:[^ false]. |
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inStream text. |
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id := String new:6. |
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inStream nextBytes:6 into:id. |
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inStream close. |
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(id = 'GIF87a') ifFalse:[ |
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(id startsWith:'GIF') ifFalse:[^ false]. |
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id ~= 'GIF89a' ifTrue:[ |
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'GIFReader [info]: not a GIF87a/GIF89a file - hope that works' infoPrintCR. |
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] |
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]. |
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^ true |
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"Modified: 10.1.1997 / 15:40:34 / cg" |
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! ! |
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!GIFReader methodsFor:'accessing'! |
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image |
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"return the first image as read" |
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^ imageSequence first |
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"Modified: 21.6.1997 / 18:32:38 / cg" |
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"Created: 21.6.1997 / 18:37:05 / cg" |
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! |
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|
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images |
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"return a collection of all images as represented by myself" |
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^ imageSequence |
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"Created: 21.6.1997 / 12:01:34 / cg" |
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"Modified: 21.6.1997 / 18:32:38 / cg" |
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! ! |
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|
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!GIFReader methodsFor:'queries'! |
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numberOfImages |
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^ imageSequence size |
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"Created: 21.6.1997 / 18:33:59 / cg" |
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! ! |
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!GIFReader methodsFor:'reading from file'! |
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checkGreyscaleColormap |
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"return true, if colormap is actually a greymap. |
139 |
Could be used to convert it into a greyScale image - which is not yet done." |
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|sz "{ Class: SmallInteger }" |
142 |
redVal| |
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sz := redMap size. |
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1 to:sz do:[:i | |
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redVal := redMap at:i. |
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redVal ~~ (greenMap at:i) ifTrue:[^ false]. |
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redVal ~~ (blueMap at:i) ifTrue:[^ false]. |
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]. |
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^ true |
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"Modified: 2.5.1996 / 17:54:40 / cg" |
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! |
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fromStream:aStream |
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"read a stream containing a GIF image. |
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Leave image description in instance variables." |
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|byte index flag count |
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colorMapSize bitsPerPixel scrWidth scrHeight |
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hasColorMap hasLocalColorMap interlaced id |
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leftOffs topOffs codeLen |
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compressedData compressedSize |
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tmp srcOffset dstOffset isGif89 atEnd |
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h "{ Class: SmallInteger }"| |
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inStream := aStream. |
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aStream binary. |
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"GIF-files are always lsb (intel-world)" |
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byteOrder := #lsb. |
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id := ByteArray new:6. |
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aStream nextBytes:6 into:id startingAt:1. |
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id := id asString. |
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"all I had for testing where GIF87a files; |
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I hope later versions work too ..." |
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154 | 181 |
isGif89 := false. |
43 | 182 |
(id ~= 'GIF87a') ifTrue:[ |
154 | 183 |
(id startsWith:'GIF') ifFalse:[ |
355 | 184 |
'GIFReader [info]: not a gif file' infoPrintCR. |
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^ nil |
186 |
]. |
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187 |
id ~= 'GIF89a' ifTrue:[ |
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'GIFReader [info]: not a GIF87a/GIF89a file - hope that works' infoPrintCR. |
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] |
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]. |
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"get screen dimensions (not used)" |
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194 |
scrWidth := aStream nextShortMSB:false. |
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scrHeight := aStream nextShortMSB:false. |
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"get flag byte" |
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flag := aStream nextByte. |
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hasColorMap := (flag bitAnd:2r10000000) ~~ 0. |
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"bitsPerRGB := ((flag bitAnd:2r01110000) bitShift:-4) + 1. " |
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"colorMapSorted := ((flag bitAnd:2r00001000) ~~ 0. " |
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bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
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colorMapSize := 1 bitShift:bitsPerPixel. |
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"get background (not used)" |
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aStream nextByte. |
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"aspect ratio (not used)" |
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aStream nextByte. |
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"get colorMap" |
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hasColorMap ifTrue:[ |
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self readColorMap:colorMapSize. |
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colorMap := Colormap |
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redVector:redMap |
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greenVector:greenMap |
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blueVector:blueMap. |
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]. |
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220 |
photometric := #palette. |
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samplesPerPixel := 1. |
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bitsPerSample := #(8). |
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223 |
||
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atEnd := false. |
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[atEnd] whileFalse:[ |
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"gif89a extensions" |
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byte := aStream nextByte. |
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|
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[byte == 16r21] whileTrue:[ |
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"/ extension |
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self readExtension:aStream. |
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byte := aStream nextByte. |
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]. |
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|
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(byte == 16r3B) ifTrue:[ "trailer" |
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atEnd := true |
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] ifFalse:[ |
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"must be image separator" |
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(byte ~~ 16r2C) ifTrue:[ |
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('GIFReader [info]: corrupted gif file (no IMAGESEP): ' , (byte printStringRadix:16)) infoPrintCR. |
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241 |
^ nil |
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]. |
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243 |
|
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"get image data" |
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leftOffs := aStream nextShortMSB:false. |
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topOffs := aStream nextShortMSB:false. |
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width := aStream nextShortMSB:false. |
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height := aStream nextShortMSB:false. |
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|
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dimensionCallBack notNil ifTrue:[ |
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dimensionCallBack value:self |
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]. |
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|
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"/ |
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"/ 'width ' print. width printNewline. |
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"/ 'height ' print. height printNewline. |
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"/ |
43 | 258 |
|
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"another flag byte" |
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flag := aStream nextByte. |
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interlaced := (flag bitAnd:2r01000000) ~~ 0. |
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hasLocalColorMap := (flag bitAnd:2r10000000) ~~ 0. |
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"localColorMapSorted := (flag bitAnd:2r00100000) ~~ 0. " |
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|
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"if image has a local colormap, this one is used" |
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266 |
|
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267 |
hasLocalColorMap ifTrue:[ |
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268 |
"local descr. overwrites" |
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269 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
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270 |
colorMapSize := 1 bitShift:bitsPerPixel. |
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271 |
"overwrite colormap" |
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272 |
self readColorMap:colorMapSize. |
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273 |
colorMap := Colormap |
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|
274 |
redVector:redMap |
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|
275 |
greenVector:greenMap |
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276 |
blueVector:blueMap. |
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|
277 |
]. |
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|
278 |
|
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|
279 |
|
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|
280 |
"get codelen for decompression" |
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281 |
codeLen := aStream nextByte. |
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|
282 |
|
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283 |
compressedData := ByteArray uninitializedNew:(aStream size). |
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284 |
|
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285 |
"get compressed data" |
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286 |
index := 1. |
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287 |
count := aStream nextByte. |
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288 |
[count notNil and:[count ~~ 0]] whileTrue:[ |
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289 |
aStream nextBytes:count into:compressedData startingAt:index blockSize:4096. |
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290 |
index := index + count. |
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291 |
count := aStream nextByte |
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|
292 |
]. |
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|
293 |
compressedSize := index - 1. |
83 | 294 |
|
618
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295 |
h := height. |
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296 |
data := ByteArray new:((width + 1) * (h + 1)). |
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297 |
"/ 'GIFReader: decompressing ...' infoPrintCR. |
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|
298 |
|
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|
299 |
self class decompressGIFFrom:compressedData |
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300 |
count:compressedSize |
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|
301 |
into:data |
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|
302 |
startingAt:1 |
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|
303 |
codeLen:(codeLen + 1). |
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|
304 |
|
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|
305 |
interlaced ifTrue:[ |
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|
306 |
"/ 'GIFREADER: deinterlacing ...' infoPrintCR. |
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|
307 |
tmp := ByteArray new:(data size). |
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|
308 |
|
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|
309 |
"phase 1: 0, 8, 16, 24, ..." |
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|
310 |
|
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|
311 |
srcOffset := 1. |
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|
312 |
0 to:(h - 1) by:8 do:[:dstRow | |
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|
313 |
dstOffset := dstRow * width + 1. |
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|
314 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
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315 |
with:data startingAt:srcOffset. |
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|
316 |
srcOffset := srcOffset + width. |
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|
317 |
]. |
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|
318 |
|
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|
319 |
"phase 2: 4, 12, 20, 28, ..." |
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|
320 |
|
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|
321 |
4 to:(h - 1) by:8 do:[:dstRow | |
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|
322 |
dstOffset := dstRow * width + 1. |
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|
323 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
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|
324 |
with:data startingAt:srcOffset. |
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|
325 |
srcOffset := srcOffset + width. |
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|
326 |
]. |
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|
327 |
|
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|
328 |
"phase 3: 2, 6, 10, 14, ..." |
43 | 329 |
|
618
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|
330 |
2 to:(h - 1) by:4 do:[:dstRow | |
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|
331 |
dstOffset := dstRow * width + 1. |
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|
332 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
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|
333 |
with:data startingAt:srcOffset. |
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|
334 |
srcOffset := srcOffset + width. |
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diff
changeset
|
335 |
]. |
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parents:
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diff
changeset
|
336 |
|
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parents:
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changeset
|
337 |
"phase 4: 1, 3, 5, 7, ..." |
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changeset
|
338 |
|
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|
339 |
1 to:(h - 1) by:2 do:[:dstRow | |
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|
340 |
dstOffset := dstRow * width + 1. |
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|
341 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
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|
342 |
with:data startingAt:srcOffset. |
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|
343 |
srcOffset := srcOffset + width. |
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|
344 |
]. |
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changeset
|
345 |
|
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|
346 |
data := tmp. |
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diff
changeset
|
347 |
tmp := nil. |
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diff
changeset
|
348 |
|
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changeset
|
349 |
imageSequence isNil ifTrue:[ |
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|
350 |
imageSequence := OrderedCollection new. |
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changeset
|
351 |
]. |
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parents:
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diff
changeset
|
352 |
maskPixelValue notNil ifTrue:[ |
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|
353 |
"/ |
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|
354 |
"/ ok, there is a maskValue |
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|
355 |
"/ build a Depth1Image for it. |
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parents:
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diff
changeset
|
356 |
"/ |
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changeset
|
357 |
self buildMaskFromColor:maskPixelValue |
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|
358 |
]. |
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parents:
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diff
changeset
|
359 |
|
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parents:
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changeset
|
360 |
imageSequence add:(self image). |
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changeset
|
361 |
|
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parents:
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changeset
|
362 |
aStream atEnd ifTrue:[ |
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diff
changeset
|
363 |
atEnd := true. |
ab83e72fd105
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Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
364 |
] |
ab83e72fd105
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Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
365 |
] |
ab83e72fd105
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Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
366 |
]. |
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
367 |
]. |
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
368 |
|
43 | 369 |
" |
370 |
GIFReader fromFile:'../fileIn/bitmaps/claus.gif |
|
371 |
GIFReader fromFile:'../fileIn/bitmaps/garfield.gif' |
|
618
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|
372 |
GIFReader new fromStream:('/home2/cg/.misc/circum.gif' asFilename readStream) |
43 | 373 |
" |
154 | 374 |
|
315
506e0ce38534
Moved #buildMask from GIFReader to ImageReader>>#buildMaskFromColor:
Stefan Vogel <sv@exept.de>
parents:
312
diff
changeset
|
375 |
"Modified: 5.7.1996 / 17:32:01 / stefan" |
618
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changeset
|
376 |
"Modified: 21.6.1997 / 18:36:49 / cg" |
135 | 377 |
! |
378 |
||
379 |
makeGreyscale |
|
380 |
"not yet implemented/needed" |
|
381 |
! |
|
382 |
||
383 |
readColorMap:colorMapSize |
|
384 |
"get gif colormap consisting of colorMapSize entries" |
|
385 |
||
386 |
|sz "{ Class: SmallInteger }"| |
|
387 |
||
388 |
redMap := ByteArray uninitializedNew:colorMapSize. |
|
389 |
greenMap := ByteArray uninitializedNew:colorMapSize. |
|
390 |
blueMap := ByteArray uninitializedNew:colorMapSize. |
|
239 | 391 |
|
135 | 392 |
sz := colorMapSize. |
393 |
1 to:sz do:[:i | |
|
239 | 394 |
redMap at:i put:(inStream nextByte). |
395 |
greenMap at:i put:(inStream nextByte). |
|
396 |
blueMap at:i put:(inStream nextByte) |
|
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
397 |
]. |
239 | 398 |
|
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
399 |
"Modified: 21.6.1996 / 12:32:43 / cg" |
154 | 400 |
! |
401 |
||
402 |
readExtension:aStream |
|
239 | 403 |
"get gif89 extension - this is currently ignored" |
154 | 404 |
|
405 |
|type blockSize subBlockSize |
|
304 | 406 |
aspNum aspDen left top width height cWidth cHeight fg bg |
618
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parents:
563
diff
changeset
|
407 |
animationType animationTime animationMask |
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parents:
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diff
changeset
|
408 |
appID appAUTH |
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parents:
563
diff
changeset
|
409 |
iterationCount b| |
154 | 410 |
|
411 |
type := aStream nextByte. |
|
412 |
type == $R asciiValue ifTrue:[ |
|
239 | 413 |
"/ |
154 | 414 |
"/ Ratio extension |
239 | 415 |
"/ |
354
b4d2ce853c24
stefans suggested info/warning/error/fatal
Claus Gittinger <cg@exept.de>
parents:
339
diff
changeset
|
416 |
'GIFREADER [info]: ratio extension ignored' infoPrintCR. |
154 | 417 |
blockSize := aStream nextByte. |
418 |
(blockSize == 2) ifTrue:[ |
|
419 |
aspNum := aStream nextByte. |
|
420 |
aspDen := aStream nextByte |
|
421 |
] ifFalse:[ |
|
422 |
aStream skip:blockSize |
|
423 |
]. |
|
424 |
"/ eat subblocks |
|
425 |
||
426 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
|
427 |
aStream skip:subBlockSize |
|
239 | 428 |
]. |
429 |
^ self |
|
430 |
]. |
|
431 |
||
432 |
type == 16r01 ifTrue:[ |
|
433 |
"/ |
|
434 |
"/ plaintext extension |
|
435 |
"/ |
|
354
b4d2ce853c24
stefans suggested info/warning/error/fatal
Claus Gittinger <cg@exept.de>
parents:
339
diff
changeset
|
436 |
'GIFREADER [info]: plaintext extension ignored' infoPrintCR. |
239 | 437 |
subBlockSize := aStream nextByte. |
438 |
left := aStream nextShortMSB:false. |
|
439 |
top := aStream nextShortMSB:false. |
|
440 |
width := aStream nextShortMSB:false. |
|
441 |
height := aStream nextShortMSB:false. |
|
442 |
cWidth := aStream nextByte. |
|
443 |
cHeight := aStream nextByte. |
|
444 |
fg := aStream nextByte. |
|
445 |
bg := aStream nextByte. |
|
446 |
aStream skip:12. |
|
447 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
|
448 |
aStream skip:subBlockSize |
|
449 |
]. |
|
450 |
^ self |
|
451 |
]. |
|
452 |
||
453 |
type == 16rF9 ifTrue:[ |
|
454 |
"/ |
|
455 |
"/ graphic control extension |
|
456 |
"/ |
|
354
b4d2ce853c24
stefans suggested info/warning/error/fatal
Claus Gittinger <cg@exept.de>
parents:
339
diff
changeset
|
457 |
"/ 'GIFREADER [info]: graphic control extension ignored' infoPrintCR. |
304 | 458 |
subBlockSize := aStream nextByte. |
305 | 459 |
|
460 |
"/ type=1 means: animationMask is transparent pixel |
|
461 |
"/ to be implemented in Image ... |
|
462 |
||
304 | 463 |
animationType := aStream nextByte. |
464 |
animationTime := aStream nextShortMSB:false. |
|
465 |
animationMask := aStream nextByte. |
|
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
466 |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
467 |
(animationType bitTest: 1) ifTrue:[ |
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
468 |
maskPixelValue := animationMask. |
354
b4d2ce853c24
stefans suggested info/warning/error/fatal
Claus Gittinger <cg@exept.de>
parents:
339
diff
changeset
|
469 |
"/ 'GIFREADER [info]: mask: ' infoPrint. (maskPixelValue printStringRadix:16) infoPrintCR. |
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
470 |
]. |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
471 |
'GIFREADER [info]: animationTime: ' infoPrint. (animationTime * (1/100)) infoPrintCR. |
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
472 |
|
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
473 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
239 | 474 |
aStream skip:subBlockSize |
475 |
]. |
|
476 |
^ self |
|
477 |
]. |
|
478 |
||
519 | 479 |
type == 16rFE ifTrue:[ |
480 |
"/ |
|
481 |
"/ comment extension |
|
482 |
"/ |
|
483 |
'GIFREADER [info]: comment extension ignored' infoPrintCR. |
|
484 |
[(blockSize := aStream nextByte) ~~ 0] whileTrue:[ |
|
485 |
aStream skip:blockSize |
|
486 |
]. |
|
487 |
^ self |
|
488 |
]. |
|
489 |
||
239 | 490 |
type == 16rFF ifTrue:[ |
491 |
"/ |
|
492 |
"/ application extension |
|
493 |
"/ |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
494 |
subBlockSize := aStream nextByte. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
495 |
appID := (aStream nextBytes:8 ) asString. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
496 |
appAUTH := aStream nextBytes:3. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
497 |
|
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
498 |
subBlockSize := aStream nextByte. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
499 |
|
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
500 |
appID = 'NETSCAPE' ifTrue:[ |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
501 |
appAUTH asString = '2.0' ifTrue:[ |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
502 |
subBlockSize == 3 ifTrue:[ |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
503 |
b := aStream nextByte. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
504 |
iterationCount := aStream nextShortMSB:false. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
505 |
subBlockSize := aStream nextByte. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
506 |
] |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
507 |
] |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
508 |
]. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
509 |
|
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
510 |
('GIFREADER [info]: application extension (' , appID , ') ignored') infoPrintCR. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
511 |
[subBlockSize > 0] whileTrue:[ |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
512 |
aStream skip:subBlockSize. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
513 |
subBlockSize := aStream nextByte. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
514 |
]. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
515 |
^ self |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
516 |
]. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
517 |
|
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
518 |
type == 16r2C ifTrue:[ |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
519 |
"/ |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
520 |
"/ image descriptor extension |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
521 |
"/ |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
522 |
'GIFREADER [info]: image descriptor extension ignored' infoPrintCR. |
239 | 523 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
524 |
aStream skip:subBlockSize |
|
525 |
]. |
|
526 |
^ self |
|
527 |
]. |
|
528 |
||
529 |
"/ |
|
530 |
"/ unknown extension |
|
531 |
"/ |
|
354
b4d2ce853c24
stefans suggested info/warning/error/fatal
Claus Gittinger <cg@exept.de>
parents:
339
diff
changeset
|
532 |
'GIFREADER [info]: unknown extension ignored' infoPrintCR. |
239 | 533 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
534 |
aStream skip:subBlockSize |
|
154 | 535 |
] |
536 |
||
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
537 |
"Modified: 21.6.1997 / 11:59:05 / cg" |
0 | 538 |
! ! |
43 | 539 |
|
339 | 540 |
!GIFReader class methodsFor:'documentation'! |
135 | 541 |
|
542 |
version |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
543 |
^ '$Header: /cvs/stx/stx/libview2/GIFReader.st,v 1.49 1997-06-24 13:30:20 cg Exp $' |
135 | 544 |
! ! |
43 | 545 |
GIFReader initialize! |