author | Claus Gittinger <cg@exept.de> |
Sun, 29 Jan 2017 02:26:51 +0100 | |
changeset 3853 | 5a78ffcf69de |
parent 3849 | 2588329e3f4a |
child 3901 | f2c56662a45e |
permissions | -rw-r--r-- |
0 | 1 |
" |
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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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convert non-depth8 images when trying to save
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changeset
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"{ Package: 'stx:libview2' }" |
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|
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"{ NameSpace: Smalltalk }" |
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||
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ImageReader subclass:#GIFReader |
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instanceVariableNames:'pass xpos ypos rowByteSize remainBitCount bufByte bufStream |
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prefixTable suffixTable clearCode eoiCode freeCode codeSize |
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maxCode interlace frameDelay iterationCount leftOffs topOffs' |
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classVariableNames:'ImageSeparator Extension Terminator' |
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poolDictionaries:'' |
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category:'Graphics-Images-Readers' |
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! |
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||
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!GIFReader class methodsFor:'documentation'! |
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|
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copyright |
28 |
" |
|
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COPYRIGHT (c) 1991 by Claus Gittinger |
|
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All Rights Reserved |
21 | 31 |
|
32 |
This software is furnished under a license and may be used |
|
33 |
only in accordance with the terms of that license and with the |
|
34 |
inclusion of the above copyright notice. This software may not |
|
35 |
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 |
42 |
" |
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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 don't |
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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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||
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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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Notice: |
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there has been some annoyance regarding a patent on the compression algorithm |
62 |
used in gif. This patent is now obsolete. However, there is no warranty from |
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exept, regarding any legal problems, when using GIF. |
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We therefore highly recommend to use newer (and especially: royalty-free) formats, |
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such as PNG. |
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|
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[See also:] |
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Image Form Icon |
69 |
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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||
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examples |
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" |
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saving an animated gif sequence: |
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||
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a view showing rainfall: |
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[exBegin] |
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|BG CLR N1 H W v WIND drops gen newDrops draw remove move buffer| |
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|
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BG := Color black. |
|
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CLR := Color blue lightened. |
|
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H := 100. |
|
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W := 100. |
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N1 := 10. |
|
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WIND := 0. |
|
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drops := OrderedCollection new. |
|
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||
94 |
gen := [:n | ((1 to:n) collect:[:i | Random nextIntegerBetween:1 and:W] as:Set) collect:[:x | x@0]]. |
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newDrops := [drops addAll:(gen value:N1)]. |
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draw := [buffer fill:BG; paint:CLR. drops do:[:d | buffer displayPoint:d]]. |
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remove := [drops := drops reject:[:d | d y > H]]. |
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move := [:wind | drops := drops collect:[:d| (d x + wind)\\W @ (d y + 1)]]. |
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v := View new openAndWait. |
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100 |
buffer := Form extent:(v extent) depth:24 onDevice:v device. |
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||
102 |
[ |
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[v shown] whileTrue:[ |
104 |
draw value. |
|
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v displayForm:buffer. |
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move value:WIND. |
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remove value. |
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newDrops value. |
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WIND := (WIND+(Random nextBetween:-1 and:1)) clampBetween:-5 and:5. |
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Delay waitForSeconds:0.1. |
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] |
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] fork. |
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[exEnd] |
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saving those images: |
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[exBegin] |
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|seq img BG CLR N1 H W v drops gen gen1 buffer| |
118 |
||
119 |
BG := Color black. |
|
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CLR := Color blue lightened. |
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H := 100. |
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W := 100. |
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N1 := 10. |
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WIND := 0. |
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drops := OrderedCollection new. |
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126 |
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gen := [:n | ((1 to:n) collect:[:i | Random nextIntegerBetween:1 and:W] as:Set) collect:[:x | x@0]]. |
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newDrops := [drops addAll:(gen value:N1)]. |
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129 |
draw := [buffer fill:BG; paint:CLR. drops do:[:d | buffer displayPoint:d]]. |
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remove := [drops := drops reject:[:d | d y > H]]. |
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move := [:wind | drops := drops collect:[:d| (d x + wind)\\W @ (d y + 1)]]. |
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buffer := Form extent:W@H depth:8 onDevice:Display. |
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||
134 |
seq := OrderedCollection new. |
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500 timesRepeat:[ |
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move value:WIND. |
137 |
remove value. |
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newDrops value. |
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draw value. |
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seq add:(ImageFrame new delay:100; image:(Depth8Image fromForm:buffer)). |
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WIND := (WIND+(Random nextBetween:-1 and:1)) clampBetween:-5 and:5. |
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]. |
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||
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img := seq first image. |
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img imageSequence:(seq copyFrom:2). |
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img imageSequence do:[:each | each image colorMap:img colorMap]. |
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GIFReader save:img onFile:'/tmp/img.gif' |
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[exEnd] |
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" |
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! ! |
151 |
||
339 | 152 |
!GIFReader class methodsFor:'initialization'! |
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initialize |
|
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"install myself in the Image classes fileFormat table |
398 | 156 |
for the `.gif' extensions." |
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|
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ImageSeparator isNil ifTrue:[ |
|
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ImageSeparator := $, codePoint. |
|
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Extension := $!! codePoint. |
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Terminator := $; codePoint. |
|
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MIMETypes defineImageType:'image/gif' suffix:'gif' reader:self. |
164 |
]. |
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"Modified: 14.10.1997 / 18:47:27 / cg" |
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! ! |
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||
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!GIFReader class methodsFor:'testing'! |
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|
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canRepresent:anImage |
172 |
"return true, if anImage can be represented in my file format. |
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GIF supports depth 8 images only." |
|
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||
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anImage depth == 8 ifTrue:[^ true]. |
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('GIFReader [info]: image depth is not 8.') infoPrintCR. |
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^ false. |
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"Created: 17.10.1997 / 20:19:20 / cg" |
|
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! |
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||
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isValidImageFile:aFileName |
183 |
"return true, if aFileName contains a GIF image" |
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184 |
||
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|id inStream| |
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||
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inStream := self streamReadingFile:aFileName. |
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inStream isNil ifTrue:[^ false]. |
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||
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inStream text. |
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||
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id := String new:6. |
193 |
inStream nextBytes:6 into:id. |
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inStream close. |
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(id = 'GIF87a') ifFalse:[ |
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extracted raw image reading (i.e. after header & extensions have been read)
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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. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
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] |
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]. |
203 |
^ true |
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|
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"Modified: 10.1.1997 / 15:40:34 / cg" |
1 | 206 |
! ! |
207 |
||
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!GIFReader methodsFor:'image reading'! |
154 | 209 |
|
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fromStream:aStream |
211 |
"read a stream containing a GIF image (or an image sequence). |
|
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Leave image description in instance variables." |
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||
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|byte flag fileColorMap |
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colorMapSize bitsPerPixel scrWidth scrHeight |
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hasColorMap interlaced id |
217 |
isGif89 atEnd |
|
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img firstImage firstOffset firstFrameDelay frame imageCount| |
219 |
||
220 |
inStream := aStream. |
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aStream binary. |
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222 |
||
223 |
"GIF-files are always lsb (intel-world)" |
|
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byteOrder := #lsb. |
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225 |
||
226 |
id := ByteArray new:6. |
|
227 |
(aStream nextBytes:6 into:id startingAt:1) ~~ 6 ifTrue:[ |
|
3553 | 228 |
^ self fileFormatError:'not a gif file (short read)'. |
2596 | 229 |
]. |
230 |
id := id asString. |
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231 |
||
232 |
"all I had for testing where GIF87a files; |
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I hope later versions work too ..." |
|
234 |
||
235 |
isGif89 := false. |
|
236 |
(id ~= 'GIF87a') ifTrue:[ |
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3553 | 237 |
(id startsWith:'GIF') ifFalse:[ |
238 |
^ self fileFormatError:('not a gif file (id=''' , id , ''')'). |
|
239 |
]. |
|
240 |
id ~= 'GIF89a' ifTrue:[ |
|
241 |
'GIFReader [info]: not a GIF87a/GIF89a file - hope that works' infoPrintCR. |
|
242 |
] |
|
2596 | 243 |
]. |
244 |
||
245 |
"get screen dimensions (not used)" |
|
3553 | 246 |
scrWidth := aStream nextInt16MSB:false. |
247 |
scrHeight := aStream nextInt16MSB:false. |
|
2596 | 248 |
|
249 |
"get flag byte" |
|
250 |
flag := aStream nextByte. |
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251 |
hasColorMap := (flag bitAnd:2r10000000) ~~ 0. |
|
252 |
"bitsPerRGB := ((flag bitAnd:2r01110000) bitShift:-4) + 1. " |
|
253 |
"colorMapSorted := ((flag bitAnd:2r00001000) ~~ 0. " |
|
254 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
|
255 |
colorMapSize := 1 bitShift:bitsPerPixel. |
|
256 |
||
257 |
"get background (not used)" |
|
258 |
aStream nextByte. |
|
259 |
||
260 |
"aspect ratio (not used)" |
|
261 |
aStream nextByte. |
|
262 |
||
263 |
"get colorMap" |
|
264 |
hasColorMap ifTrue:[ |
|
3553 | 265 |
fileColorMap := self readColorMap:colorMapSize. |
2596 | 266 |
]. |
267 |
colorMap := fileColorMap. |
|
268 |
||
269 |
photometric := #palette. |
|
270 |
samplesPerPixel := 1. |
|
271 |
bitsPerSample := #(8). |
|
272 |
||
273 |
imageCount := 0. |
|
274 |
atEnd := false. |
|
275 |
[atEnd] whileFalse:[ |
|
3553 | 276 |
"gif89a extensions" |
2596 | 277 |
|
3553 | 278 |
byte := aStream nextByte. |
279 |
byte isNil ifTrue:[ |
|
280 |
"/ atEnd-Terminator missing |
|
281 |
atEnd := true |
|
282 |
] ifFalse:[ |
|
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byte == Extension ifTrue:[ |
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"/ 'Ext' infoPrintCR. |
3553 | 285 |
self readExtension:aStream. |
286 |
] ifFalse:[ |
|
287 |
(byte == Terminator) ifTrue:[ |
|
288 |
atEnd := true |
|
289 |
] ifFalse:[ |
|
290 |
"must be image separator" |
|
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(byte ~~ ImageSeparator) ifTrue:[ |
|
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^ self fileFormatError:('corrupted gif file (no IMAGESEP): ' , (byte printStringRadix:16)). |
|
293 |
]. |
|
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"/ 'Img' infoPrintCR. |
295 |
||
3553 | 296 |
fileColorMap notNil ifTrue:[ |
297 |
colorMap := fileColorMap. |
|
298 |
]. |
|
299 |
Object primitiveFailureSignal handle:[:ex | |
|
300 |
^ self fileFormatError:('corrupted gif file'). |
|
301 |
] do:[ |
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302 |
self readImage:aStream. |
|
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]. |
|
2596 | 304 |
|
3553 | 305 |
maskPixel notNil ifTrue:[ |
306 |
"/ |
|
307 |
"/ ok, there is a maskValue |
|
308 |
"/ build a Depth1Image for it. |
|
309 |
"/ |
|
310 |
self buildMaskFromColor:maskPixel |
|
311 |
]. |
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2596 | 312 |
|
3553 | 313 |
imageCount == 0 ifTrue:[ |
314 |
img := self makeImage. |
|
315 |
"/ remember first image in case more come later. |
|
316 |
firstImage := img. |
|
317 |
firstFrameDelay := frameDelay. |
|
318 |
firstOffset := (leftOffs @ topOffs). |
|
319 |
] ifFalse:[ |
|
320 |
imageCount == 1 ifTrue:[ |
|
321 |
imageSequence := ImageSequence new. |
|
322 |
img imageSequence:imageSequence. |
|
2596 | 323 |
|
3553 | 324 |
"/ add frame for first image. |
325 |
frame := ImageFrame new image:firstImage. |
|
326 |
frame delay:firstFrameDelay. |
|
327 |
frame offset:firstOffset. |
|
328 |
imageSequence add:frame. |
|
329 |
]. |
|
330 |
img := self makeImage. |
|
331 |
img imageSequence:imageSequence. |
|
2596 | 332 |
|
3553 | 333 |
"/ add frame for this image. |
334 |
frame := ImageFrame new image:img. |
|
335 |
frame delay:frameDelay. |
|
336 |
frame offset:(leftOffs @ topOffs). |
|
337 |
imageSequence add:frame. |
|
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]. |
|
2596 | 339 |
|
3553 | 340 |
imageCount := imageCount + 1. |
2596 | 341 |
|
3553 | 342 |
frameDelay := nil. |
2596 | 343 |
|
3553 | 344 |
aStream atEnd ifTrue:[ |
345 |
atEnd := true. |
|
346 |
] |
|
347 |
] |
|
348 |
]. |
|
349 |
]. |
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2596 | 350 |
]. |
351 |
||
352 |
imageSequence notNil ifTrue:[ |
|
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iterationCount notNil ifTrue:[ |
354 |
iterationCount == 0 ifTrue:[ |
|
355 |
imageSequence loop:true. |
|
356 |
] ifFalse:[ |
|
357 |
imageSequence loop:false. |
|
358 |
imageSequence iterationCount:iterationCount. |
|
359 |
] |
|
360 |
] |
|
2596 | 361 |
]. |
362 |
||
363 |
" |
|
364 |
Image fromFile:'/home/cg/work/stx/goodies/bitmaps/gifImages/animated/vrml.gif' |
|
365 |
Image fromFile:'/home/cg/work/stx/goodies/bitmaps/gifImages/animated/arrow.gif' |
|
366 |
" |
|
367 |
||
368 |
"Modified: / 5.7.1996 / 17:32:01 / stefan" |
|
369 |
"Modified: / 21.8.1998 / 22:20:00 / cg" |
|
2694 | 370 |
! ! |
371 |
||
372 |
!GIFReader methodsFor:'private-reading'! |
|
373 |
||
374 |
makeGreyscale |
|
375 |
"not yet implemented/needed" |
|
376 |
! |
|
377 |
||
378 |
readColorMap:colorMapSize |
|
379 |
"get a gif colormap consisting of colorMapSize entries" |
|
380 |
||
381 |
|rgbVector| |
|
382 |
||
383 |
rgbVector := inStream nextBytes:colorMapSize*3. |
|
3392 | 384 |
^ MappedPalette rgbBytesVector:rgbVector |
2596 | 385 |
! |
386 |
||
154 | 387 |
readExtension:aStream |
882 | 388 |
"get gif89 extension" |
154 | 389 |
|
390 |
|type blockSize subBlockSize |
|
304 | 391 |
aspNum aspDen left top width height cWidth cHeight fg bg |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
392 |
animationType animationTime animationMask |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
393 |
appID appAUTH |
888 | 394 |
b ok| |
154 | 395 |
|
396 |
type := aStream nextByte. |
|
1952
5009754ae556
Use #codePoint instead of deprecated #asciiValue
Stefan Vogel <sv@exept.de>
parents:
1846
diff
changeset
|
397 |
type == $R codePoint ifTrue:[ |
3553 | 398 |
"/ |
399 |
"/ Ratio extension |
|
400 |
"/ |
|
401 |
"/ 'GIFREADER [info]: ratio extension ignored' infoPrintCR. |
|
402 |
blockSize := aStream nextByte. |
|
403 |
(blockSize == 2) ifTrue:[ |
|
404 |
aspNum := aStream nextByte. |
|
405 |
aspDen := aStream nextByte |
|
406 |
] ifFalse:[ |
|
407 |
aStream skip:blockSize |
|
408 |
]. |
|
2844 | 409 |
|
3553 | 410 |
"/ eat subblocks |
411 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
|
412 |
aStream skip:subBlockSize |
|
413 |
]. |
|
414 |
^ self |
|
239 | 415 |
]. |
416 |
||
417 |
type == 16r01 ifTrue:[ |
|
3553 | 418 |
"/ |
419 |
"/ plaintext extension |
|
420 |
"/ |
|
421 |
"/ 'GIFREADER [info]: plaintext extension ignored' infoPrintCR. |
|
422 |
subBlockSize := aStream nextByte. |
|
423 |
left := aStream nextInt16MSB:false. |
|
424 |
top := aStream nextInt16MSB:false. |
|
425 |
width := aStream nextInt16MSB:false. |
|
426 |
height := aStream nextInt16MSB:false. |
|
427 |
cWidth := aStream nextByte. |
|
428 |
cHeight := aStream nextByte. |
|
429 |
fg := aStream nextByte. |
|
430 |
bg := aStream nextByte. |
|
431 |
aStream skip:12. |
|
432 |
"/ eat subblocks |
|
433 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
|
434 |
aStream skip:subBlockSize |
|
435 |
]. |
|
436 |
^ self |
|
239 | 437 |
]. |
438 |
||
439 |
type == 16rF9 ifTrue:[ |
|
3553 | 440 |
"/ |
441 |
"/ graphic control extension |
|
442 |
"/ |
|
443 |
"/ 'GIFREADER [info]: graphic control extension' infoPrintCR. |
|
670
6a7f628ee66c
oops - mask was only set for interlaced images (stupid typo)
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
444 |
|
3553 | 445 |
[(subBlockSize := aStream nextByte) ~~ 0 and:[subBlockSize notNil]] whileTrue:[ |
446 |
"/ type bitAnd:1 means: animationMask is transparent pixel |
|
447 |
"/ to be implemented in Image ... |
|
305 | 448 |
|
3553 | 449 |
animationType := aStream nextByte. |
450 |
animationTime := aStream nextInt16MSB:false. |
|
451 |
animationMask := aStream nextByte. |
|
2595
37dc71e1e59b
be tolerant to corrupted gif files (subblock size in extension)
Claus Gittinger <cg@exept.de>
parents:
2056
diff
changeset
|
452 |
|
3553 | 453 |
subBlockSize := subBlockSize - 4. |
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
454 |
|
3553 | 455 |
(animationType bitTest: 1) ifTrue:[ |
456 |
maskPixel := animationMask. |
|
670
6a7f628ee66c
oops - mask was only set for interlaced images (stupid typo)
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
457 |
"/ 'GIFREADER [info]: mask: ' infoPrint. (maskPixel printStringRadix:16) infoPrintCR. |
3553 | 458 |
]. |
670
6a7f628ee66c
oops - mask was only set for interlaced images (stupid typo)
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
459 |
"/ 'GIFREADER [info]: animationTime: ' infoPrint. (animationTime * (1/100)) infoPrintCR. |
1429 | 460 |
"/ 'GIFREADER [info]: animationType: ' infoPrint. (animationType) infoPrintCR. |
461 |
"/ 'GIFREADER [info]: animationMask: ' infoPrint. (animationMask) infoPrintCR. |
|
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
462 |
|
3553 | 463 |
frameDelay := (animationTime * (1/100)) * 1000. |
888 | 464 |
|
3553 | 465 |
subBlockSize ~~ 0 ifTrue:[ |
466 |
aStream skip:subBlockSize |
|
467 |
]. |
|
468 |
]. |
|
469 |
^ self |
|
239 | 470 |
]. |
471 |
||
519 | 472 |
type == 16rFE ifTrue:[ |
3553 | 473 |
"/ |
474 |
"/ comment extension |
|
475 |
"/ |
|
476 |
"/ 'GIFREADER [info]: comment extension' infoPrintCR. |
|
477 |
[(blockSize := aStream nextByte) ~~ 0] whileTrue:[ |
|
478 |
aStream skip:blockSize |
|
479 |
]. |
|
480 |
^ self |
|
519 | 481 |
]. |
482 |
||
239 | 483 |
type == 16rFF ifTrue:[ |
3553 | 484 |
"/ |
485 |
"/ application extension |
|
486 |
"/ |
|
487 |
"/ 'GIFREADER [info]: application extension' infoPrintCR. |
|
488 |
subBlockSize := aStream nextByte. |
|
489 |
appID := (aStream nextBytes:8 ) asString. |
|
490 |
appAUTH := aStream nextBytes:3. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
491 |
|
3553 | 492 |
subBlockSize := aStream nextByte. |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
493 |
|
3553 | 494 |
ok := false. |
495 |
appID = 'NETSCAPE' ifTrue:[ |
|
496 |
appAUTH asString = '2.0' ifTrue:[ |
|
497 |
subBlockSize == 3 ifTrue:[ |
|
498 |
b := aStream nextByte. |
|
499 |
iterationCount := aStream nextInt16MSB:false. |
|
500 |
subBlockSize := aStream nextByte. |
|
501 |
ok := true. |
|
888 | 502 |
"/ ('GIFREADER [info]: NETSCAPE application extension - iterationCount = ') infoPrint. |
503 |
"/ iterationCount infoPrintCR. |
|
3553 | 504 |
] |
505 |
] |
|
506 |
]. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
507 |
|
3553 | 508 |
ok ifFalse:[ |
509 |
('GIFREADER [info]: application extension (' , appID , ') ignored') infoPrintCR. |
|
510 |
]. |
|
625 | 511 |
|
3553 | 512 |
[subBlockSize > 0] whileTrue:[ |
513 |
aStream skip:subBlockSize. |
|
514 |
subBlockSize := aStream nextByte. |
|
515 |
]. |
|
516 |
^ self |
|
618
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 |
|
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
519 |
type == 16r2C ifTrue:[ |
3553 | 520 |
"/ |
521 |
"/ image descriptor extension |
|
522 |
"/ |
|
523 |
"/ 'GIFREADER [info]: image descriptor extension ignored' infoPrintCR. |
|
524 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
|
525 |
aStream skip:subBlockSize |
|
526 |
]. |
|
527 |
^ self |
|
239 | 528 |
]. |
529 |
||
530 |
"/ |
|
531 |
"/ unknown extension |
|
532 |
"/ |
|
354
b4d2ce853c24
stefans suggested info/warning/error/fatal
Claus Gittinger <cg@exept.de>
parents:
339
diff
changeset
|
533 |
'GIFREADER [info]: unknown extension ignored' infoPrintCR. |
239 | 534 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
3553 | 535 |
aStream skip:subBlockSize |
154 | 536 |
] |
537 |
||
2844 | 538 |
"Modified: / 02-06-2010 / 12:21:53 / cg" |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
539 |
! |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
540 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
541 |
readImage:aStream |
882 | 542 |
"read a single image from aStream." |
543 |
||
1429 | 544 |
| flag interlaced hasLocalColorMap bitsPerPixel colorMapSize |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
545 |
codeLen compressedData compressedSize index count h tmp srcOffset dstOffset |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
546 |
initialBuffSize| |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
547 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
548 |
"get image data" |
3553 | 549 |
leftOffs := aStream nextInt16MSB:false. |
550 |
topOffs := aStream nextInt16MSB:false. |
|
1429 | 551 |
"/ 'GIFReader: leftOffs ' infoPrint. leftOffs infoPrintCR. |
552 |
"/ 'GIFReader: topOffs ' infoPrint. topOffs infoPrintCR. |
|
3553 | 553 |
width := aStream nextInt16MSB:false. |
554 |
height := aStream nextInt16MSB:false. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
555 |
|
1846 | 556 |
self reportDimension. |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
557 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
558 |
"/ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
559 |
"/ 'width ' print. width printNewline. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
560 |
"/ 'height ' print. height printNewline. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
561 |
"/ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
562 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
563 |
"another flag byte" |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
564 |
flag := aStream nextByte. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
565 |
interlaced := (flag bitAnd:2r01000000) ~~ 0. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
566 |
hasLocalColorMap := (flag bitAnd:2r10000000) ~~ 0. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
567 |
"localColorMapSorted := (flag bitAnd:2r00100000) ~~ 0. " |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
568 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
569 |
"if image has a local colormap, this one is used" |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
570 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
571 |
hasLocalColorMap ifTrue:[ |
3553 | 572 |
"local descr. overwrites" |
573 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
|
574 |
colorMapSize := 1 bitShift:bitsPerPixel. |
|
575 |
"overwrite colormap" |
|
576 |
colorMap := self readColorMap:colorMapSize. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
577 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
578 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
579 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
580 |
"get codelen for decompression" |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
581 |
codeLen := aStream nextByte. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
582 |
(aStream respondsTo:#fileSize) ifTrue:[ |
3553 | 583 |
initialBuffSize := aStream fileSize. |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
584 |
] ifFalse:[ |
3553 | 585 |
initialBuffSize := 512. |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
586 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
587 |
compressedData := ByteArray uninitializedNew:initialBuffSize. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
588 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
589 |
"get compressed data" |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
590 |
index := 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
591 |
count := aStream nextByte. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
592 |
[count notNil and:[count ~~ 0]] whileTrue:[ |
3553 | 593 |
(compressedData size < (index+count)) ifTrue:[ |
594 |
|t| |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
595 |
|
3784 | 596 |
t := ByteArray uninitializedNew:((index+count)*3//2). |
3553 | 597 |
t replaceBytesFrom:1 to:index-1 with:compressedData startingAt:1. |
598 |
compressedData := t. |
|
599 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
600 |
|
3553 | 601 |
aStream nextBytes:count into:compressedData startingAt:index blockSize:4096. |
602 |
index := index + count. |
|
603 |
count := aStream nextByte |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
604 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
605 |
compressedSize := index - 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
606 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
607 |
h := height. |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
608 |
data := ByteArray new:((width + 1) * (h + 1)). |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
609 |
"/ 'GIFReader: decompressing ...' infoPrintCR. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
610 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
611 |
self class decompressGIFFrom:compressedData |
3553 | 612 |
count:compressedSize |
613 |
into:data |
|
614 |
startingAt:1 |
|
615 |
codeLen:(codeLen + 1). |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
616 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
617 |
interlaced ifTrue:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
618 |
"/ 'GIFREADER: deinterlacing ...' infoPrintCR. |
3553 | 619 |
tmp := ByteArray new:(data size). |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
620 |
|
3553 | 621 |
"phase 1: 0, 8, 16, 24, ..." |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
622 |
|
3553 | 623 |
srcOffset := 1. |
624 |
0 to:(h - 1) by:8 do:[:dstRow | |
|
625 |
dstOffset := dstRow * width + 1. |
|
626 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
627 |
with:data startingAt:srcOffset. |
|
628 |
srcOffset := srcOffset + width. |
|
629 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
630 |
|
3553 | 631 |
"phase 2: 4, 12, 20, 28, ..." |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
632 |
|
3553 | 633 |
4 to:(h - 1) by:8 do:[:dstRow | |
634 |
dstOffset := dstRow * width + 1. |
|
635 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
636 |
with:data startingAt:srcOffset. |
|
637 |
srcOffset := srcOffset + width. |
|
638 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
639 |
|
3553 | 640 |
"phase 3: 2, 6, 10, 14, ..." |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
641 |
|
3553 | 642 |
2 to:(h - 1) by:4 do:[:dstRow | |
643 |
dstOffset := dstRow * width + 1. |
|
644 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
645 |
with:data startingAt:srcOffset. |
|
646 |
srcOffset := srcOffset + width. |
|
647 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
648 |
|
3553 | 649 |
"phase 4: 1, 3, 5, 7, ..." |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
650 |
|
3553 | 651 |
1 to:(h - 1) by:2 do:[:dstRow | |
652 |
dstOffset := dstRow * width + 1. |
|
653 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
654 |
with:data startingAt:srcOffset. |
|
655 |
srcOffset := srcOffset + width. |
|
656 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
657 |
|
3553 | 658 |
data := tmp. |
659 |
tmp := nil. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
660 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
661 |
|
3784 | 662 |
"Created: / 13-01-1998 / 10:44:05 / cg" |
663 |
"Modified: / 12-08-1998 / 13:55:32 / cg" |
|
664 |
"Modified (format): / 16-11-2016 / 23:07:20 / cg" |
|
0 | 665 |
! ! |
43 | 666 |
|
1805 | 667 |
!GIFReader methodsFor:'private-writing'! |
668 |
||
669 |
assignTransparentPixelIn:image |
|
670 |
"find an usused pixelValue in the colorMap (or image)." |
|
671 |
||
3689 | 672 |
|cmap cmapSize imgDepth usedPixelValues unusedValues| |
1805 | 673 |
|
3689 | 674 |
cmap := image colorMap. |
675 |
cmapSize := cmap size. |
|
676 |
((cmapSize > 0) and:[cmapSize < 256]) ifTrue:[ |
|
677 |
maskPixel := cmapSize. |
|
678 |
^ self |
|
1805 | 679 |
]. |
3689 | 680 |
|
3009 | 681 |
image compressColorMap. |
3689 | 682 |
imgDepth := image depth. |
1805 | 683 |
usedPixelValues := image usedValues. |
3689 | 684 |
usedPixelValues size < (1 bitShift:imgDepth) ifFalse:[ |
685 |
Image informationLostQuerySignal |
|
686 |
raiseRequestWith:image |
|
687 |
errorString:('GIF writer cannot assign a transparent pixel - all pixelValues used by image'). |
|
2056
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
688 |
]. |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
689 |
|
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
690 |
"/ there must be an unused pixelValue |
3689 | 691 |
unusedValues := (0 to:(1 bitShift:imgDepth)-1) asSet. |
2056
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
692 |
unusedValues removeAll:usedPixelValues. |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
693 |
|
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
694 |
maskPixel := unusedValues first. |
3009 | 695 |
|
696 |
"Modified: / 17-07-2012 / 12:25:24 / anwild" |
|
1805 | 697 |
! |
698 |
||
699 |
checkCodeSize |
|
700 |
(freeCode > maxCode and: [codeSize < 12]) |
|
3392 | 701 |
ifTrue: |
1805 | 702 |
[codeSize := codeSize + 1. |
703 |
maxCode := (1 bitShift: codeSize) - 1] |
|
704 |
||
705 |
"Created: 14.10.1997 / 18:42:01 / cg" |
|
706 |
! |
|
707 |
||
708 |
flushBits |
|
709 |
remainBitCount = 0 |
|
3392 | 710 |
ifFalse: |
1805 | 711 |
[self nextBytePut: bufByte. |
712 |
remainBitCount := 0]. |
|
713 |
self flushBuffer |
|
714 |
||
715 |
"Modified: 14.10.1997 / 18:58:06 / cg" |
|
716 |
! |
|
717 |
||
718 |
flushBuffer |
|
719 |
bufStream isEmpty ifTrue: [^ self]. |
|
720 |
outStream nextPut: bufStream size. |
|
721 |
outStream nextPutAll: bufStream contents. |
|
722 |
bufStream := WriteStream on: (ByteArray new: 256) |
|
723 |
||
724 |
"Modified: 14.10.1997 / 20:46:04 / cg" |
|
725 |
! |
|
726 |
||
727 |
flushCode |
|
728 |
self flushBits |
|
729 |
||
730 |
"Created: 14.10.1997 / 18:57:33 / cg" |
|
731 |
! |
|
732 |
||
733 |
nextBitsPut: anInteger |
|
3392 | 734 |
| integer writeBitCount shiftCount | |
735 |
shiftCount := 0. |
|
736 |
remainBitCount = 0 |
|
737 |
ifTrue: |
|
738 |
[writeBitCount := 8. |
|
739 |
integer := anInteger] |
|
740 |
ifFalse: |
|
741 |
[writeBitCount := remainBitCount. |
|
742 |
integer := bufByte + (anInteger bitShift: 8 - remainBitCount)]. |
|
743 |
[writeBitCount < codeSize] |
|
744 |
whileTrue: |
|
745 |
[self nextBytePut: ((integer bitShift: shiftCount) bitAnd: 255). |
|
746 |
shiftCount := shiftCount - 8. |
|
747 |
writeBitCount := writeBitCount + 8]. |
|
748 |
(remainBitCount := writeBitCount - codeSize) = 0 |
|
749 |
ifTrue: [self nextBytePut: (integer bitShift: shiftCount)] |
|
750 |
ifFalse: [bufByte := integer bitShift: shiftCount]. |
|
751 |
^anInteger |
|
1805 | 752 |
|
753 |
"Modified: 15.10.1997 / 16:50:30 / cg" |
|
754 |
! |
|
755 |
||
756 |
nextBytePut: aByte |
|
757 |
bufStream nextPut: aByte. |
|
758 |
bufStream size >= 254 ifTrue: [self flushBuffer] |
|
759 |
||
760 |
"Modified: 15.10.1997 / 16:50:52 / cg" |
|
761 |
! |
|
762 |
||
3392 | 763 |
readPixelFrom: bits |
1805 | 764 |
| pixel | |
765 |
ypos >= height ifTrue: [^ nil]. |
|
3392 | 766 |
(maskPixel notNil |
1805 | 767 |
and:[(mask pixelAtX:xpos y:ypos) == 0]) ifTrue:[ |
768 |
pixel := maskPixel |
|
769 |
] ifFalse:[ |
|
770 |
pixel := bits at: ypos * rowByteSize + xpos + 1. |
|
771 |
]. |
|
772 |
self updatePixelPosition. |
|
773 |
^ pixel |
|
774 |
||
775 |
"Created: 14.10.1997 / 18:43:50 / cg" |
|
776 |
"Modified: 15.10.1997 / 16:46:43 / cg" |
|
777 |
! |
|
778 |
||
3392 | 779 |
setParameters:bitsPerPixel |
1805 | 780 |
clearCode := 1 bitShift:bitsPerPixel. |
781 |
eoiCode := clearCode + 1. |
|
782 |
freeCode := clearCode + 2. |
|
783 |
codeSize := bitsPerPixel + 1. |
|
784 |
maxCode := (1 bitShift: codeSize) - 1 |
|
785 |
||
786 |
"Modified: 14.10.1997 / 20:09:48 / cg" |
|
787 |
! |
|
788 |
||
789 |
updatePixelPosition |
|
790 |
(xpos := xpos + 1) >= width ifFalse: [^ self]. |
|
791 |
||
792 |
xpos := 0. |
|
793 |
interlace == true ifFalse:[ |
|
3392 | 794 |
ypos := ypos + 1. |
795 |
^ self |
|
1805 | 796 |
]. |
797 |
||
798 |
pass == 0 ifTrue:[ |
|
3392 | 799 |
(ypos := ypos + 8) >= height ifTrue:[ |
800 |
pass := pass + 1. |
|
801 |
ypos := 4 |
|
802 |
]. |
|
803 |
^ self |
|
1805 | 804 |
]. |
805 |
pass == 1 ifTrue:[ |
|
3392 | 806 |
(ypos := ypos + 8) >= height ifTrue:[ |
807 |
pass := pass + 1. |
|
808 |
ypos := 2 |
|
809 |
]. |
|
810 |
^ self |
|
1805 | 811 |
]. |
812 |
pass == 2 ifTrue:[ |
|
3392 | 813 |
(ypos := ypos + 4) >= height ifTrue:[ |
814 |
pass := pass + 1. |
|
815 |
ypos := 1 |
|
816 |
]. |
|
817 |
^ self |
|
1805 | 818 |
]. |
819 |
pass == 3 ifTrue:[ |
|
3392 | 820 |
ypos := ypos + 2. |
821 |
^ self |
|
1805 | 822 |
]. |
823 |
^ self error: 'can''t happen' |
|
824 |
||
825 |
"Modified: 14.10.1997 / 18:44:27 / cg" |
|
826 |
! |
|
827 |
||
2032 | 828 |
writeBitDataFor: image |
829 |
"using modified Lempel-Ziv Welch algorithm." |
|
830 |
||
831 |
| bits bitsPerPixel t1 |
|
3849 | 832 |
maxBits maxMaxCode tSize initCodeSize ent tShift fCode |
833 |
pixel |
|
834 |
index disp nomatch | |
|
2032 | 835 |
|
836 |
outStream nextPut:ImageSeparator. |
|
3282 | 837 |
self writeShort:0. "/ leftOffs |
838 |
self writeShort:0. "/ topOffs |
|
2032 | 839 |
self writeShort:width. "/ image size |
840 |
self writeShort:height. |
|
841 |
||
842 |
interlace == true ifTrue:[ |
|
3848 | 843 |
t1 := 64 |
2032 | 844 |
] ifFalse:[ |
3848 | 845 |
t1 := 0 "/ no local colormap |
2032 | 846 |
]. |
847 |
outStream nextPut:t1. "/ another flag |
|
848 |
||
849 |
bitsPerPixel := image bitsPerPixel. |
|
850 |
bits := image bits. |
|
851 |
||
852 |
pass := 0. |
|
853 |
xpos := 0. |
|
854 |
ypos := 0. |
|
855 |
rowByteSize := image bytesPerRow. "/ width * 8 + 31 // 32 * 4. |
|
856 |
remainBitCount := 0. |
|
857 |
bufByte := 0. |
|
858 |
bufStream := WriteStream on: (ByteArray new: 256). |
|
859 |
||
860 |
maxBits := 12. |
|
861 |
maxMaxCode := 1 bitShift: maxBits. |
|
862 |
tSize := 5003. |
|
863 |
prefixTable := Array new: tSize. |
|
3364 | 864 |
suffixTable := Array new: tSize withAll:-1. |
2032 | 865 |
|
866 |
initCodeSize := bitsPerPixel <= 1 ifTrue: [2] ifFalse: [bitsPerPixel]. |
|
867 |
outStream nextPut: initCodeSize. |
|
868 |
self setParameters: initCodeSize. |
|
869 |
||
870 |
tShift := 0. |
|
871 |
fCode := tSize. |
|
2845
62d4128bb923
comment/format in: #writeBitDataFor:
Claus Gittinger <cg@exept.de>
parents:
2844
diff
changeset
|
872 |
[fCode < 65536] whileTrue:[ |
3848 | 873 |
tShift := tShift + 1. |
874 |
fCode := fCode * 2 |
|
2845
62d4128bb923
comment/format in: #writeBitDataFor:
Claus Gittinger <cg@exept.de>
parents:
2844
diff
changeset
|
875 |
]. |
2032 | 876 |
tShift := 8 - tShift. |
3364 | 877 |
"/ 1 to: tSize do: [:i | suffixTable at: i put: -1]. - cg changed initialization above |
2032 | 878 |
|
879 |
self writeCodeAndCheckCodeSize: clearCode. |
|
880 |
ent := self readPixelFrom: bits. |
|
3848 | 881 |
[(pixel := self readPixelFrom: bits) notNil] whileTrue:[ |
882 |
fCode := (pixel bitShift: maxBits) + ent. |
|
883 |
index := ((pixel bitShift: tShift) bitXor: ent) + 1. |
|
884 |
(suffixTable at: index) = fCode |
|
885 |
ifTrue: [ent := prefixTable at: index] |
|
886 |
ifFalse:[ |
|
887 |
nomatch := true. |
|
888 |
(suffixTable at: index) >= 0 |
|
889 |
ifTrue:[ |
|
890 |
disp := tSize - index + 1. |
|
891 |
index = 1 ifTrue: [disp := 1]. |
|
892 |
"probe" |
|
893 |
[(index := index - disp) < 1 ifTrue: [index := index + tSize]. |
|
894 |
(suffixTable at: index) = fCode |
|
895 |
ifTrue:[ |
|
896 |
ent := prefixTable at: index. |
|
897 |
nomatch := false. |
|
898 |
"continue whileFalse:"]. |
|
899 |
nomatch and: [(suffixTable at: index) > 0]] |
|
900 |
whileTrue: ["probe"]]. |
|
901 |
"nomatch" |
|
902 |
nomatch ifTrue:[ |
|
903 |
self writeCodeAndCheckCodeSize: ent. |
|
904 |
ent := pixel. |
|
905 |
freeCode < maxMaxCode |
|
906 |
ifTrue:[ |
|
907 |
prefixTable at: index put: freeCode. |
|
908 |
suffixTable at: index put: fCode. |
|
909 |
freeCode := freeCode + 1] |
|
910 |
ifFalse:[ |
|
911 |
self writeCodeAndCheckCodeSize: clearCode. |
|
912 |
suffixTable from:1 to:tSize put:-1. |
|
913 |
self setParameters: initCodeSize]]]]. |
|
2032 | 914 |
prefixTable := suffixTable := nil. |
915 |
self writeCodeAndCheckCodeSize: ent. |
|
916 |
self writeCodeAndCheckCodeSize: eoiCode. |
|
917 |
self flushCode. |
|
918 |
outStream nextPut: 0. "zero-length packet" |
|
919 |
||
2845
62d4128bb923
comment/format in: #writeBitDataFor:
Claus Gittinger <cg@exept.de>
parents:
2844
diff
changeset
|
920 |
"Modified: / 02-06-2010 / 12:24:20 / cg" |
2032 | 921 |
! |
922 |
||
3392 | 923 |
writeCode: aCode |
1805 | 924 |
self nextBitsPut: aCode |
925 |
||
926 |
"Created: 14.10.1997 / 18:38:35 / cg" |
|
927 |
"Modified: 15.10.1997 / 17:01:47 / cg" |
|
928 |
! |
|
929 |
||
3392 | 930 |
writeCodeAndCheckCodeSize: t1 |
1805 | 931 |
self writeCode: t1. |
932 |
self checkCodeSize |
|
933 |
||
934 |
"Created: 14.10.1997 / 18:38:24 / cg" |
|
935 |
"Modified: 14.10.1997 / 18:40:56 / cg" |
|
2032 | 936 |
! |
937 |
||
938 |
writeHeaderFor:image |
|
939 |
"write the gif header" |
|
940 |
||
941 |
|bitsPerPixel t1| |
|
942 |
||
943 |
bitsPerPixel := image bitsPerPixel. |
|
944 |
||
945 |
outStream nextPutAll: 'GIF89a' asByteArray. |
|
946 |
self writeShort:width. "/ screen size |
|
3392 | 947 |
self writeShort:height. |
2032 | 948 |
t1 := 128. |
949 |
t1 := t1 bitOr:(bitsPerPixel - 1 bitShift:5). |
|
950 |
t1 := t1 bitOr:(bitsPerPixel - 1). |
|
951 |
outStream nextPut:t1. "/ flag |
|
952 |
outStream nextPut:0. "/ background (not used) |
|
953 |
outStream nextPut:0. "/ aspect ratio |
|
954 |
||
955 |
0 to:(1 bitShift:bitsPerPixel)-1 do:[:pixel | |
|
3392 | 956 |
|clr red green blue| |
2032 | 957 |
|
3392 | 958 |
clr := image colorFromValue:pixel. |
959 |
clr isNil ifTrue:[ |
|
960 |
"/ unused colorMap slot |
|
961 |
red := green := blue := 0. |
|
962 |
] ifFalse:[ |
|
963 |
red := (clr redByte). |
|
964 |
green := (clr greenByte). |
|
965 |
blue := (clr blueByte). |
|
966 |
]. |
|
967 |
outStream |
|
968 |
nextPut:red; nextPut:green; nextPut:blue. |
|
969 |
]. |
|
2032 | 970 |
|
971 |
"Created: / 14.10.1997 / 17:41:28 / cg" |
|
972 |
"Modified: / 31.10.1997 / 16:12:13 / cg" |
|
973 |
! |
|
974 |
||
975 |
writeMaskExtensionHeaderFor:image |
|
976 |
"write an extension header for the transparent pixel" |
|
977 |
||
978 |
outStream nextPut:Extension. |
|
979 |
outStream nextPut:16rF9. "/ graphic control extension |
|
980 |
outStream nextPut:4. "/ subBlockSize |
|
981 |
||
982 |
outStream nextPut:1. "/ animationType |
|
3658 | 983 |
outStream nextPutInt16LSB:1. "/ animationTime |
2032 | 984 |
outStream nextPut:maskPixel. "/ animationMask |
985 |
||
986 |
outStream nextPut:0. |
|
1805 | 987 |
! ! |
988 |
||
708 | 989 |
!GIFReader methodsFor:'writing to file'! |
990 |
||
991 |
save:image onFile:aFileName |
|
992 |
"save image as GIF file on aFileName" |
|
993 |
||
1813
aa74c7bd22ad
image saving - use save:onStream:
Claus Gittinger <cg@exept.de>
parents:
1811
diff
changeset
|
994 |
|convertedImage| |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
995 |
|
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
996 |
image depth ~~ 8 ifTrue:[ |
3392 | 997 |
Error handle:[:ex | |
998 |
^ Image cannotRepresentImageSignal |
|
999 |
raiseWith:image |
|
1000 |
errorString:('GIF failed to convert image to depth8: ', ex description). |
|
1001 |
"/ ex return. |
|
1002 |
] do:[ |
|
1003 |
convertedImage := Image newForDepth:8. |
|
1004 |
convertedImage fromImage:image photometric:#palette. |
|
1005 |
]. |
|
1006 |
convertedImage notNil ifTrue:[ |
|
1007 |
^ self save:convertedImage onFile:aFileName |
|
1008 |
]. |
|
1009 |
^ Image cannotRepresentImageSignal |
|
1010 |
raiseWith:image |
|
1011 |
errorString:('GIF (currently) only supports depth8 images (cannot convert)'). |
|
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
1012 |
]. |
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
1013 |
|
1813
aa74c7bd22ad
image saving - use save:onStream:
Claus Gittinger <cg@exept.de>
parents:
1811
diff
changeset
|
1014 |
super save:image onFile:aFileName. |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1015 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1016 |
" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1017 |
|i| |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1018 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1019 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1020 |
GIFReader save:i onFile:'foo.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1021 |
(Image fromFile:'./foo.gif') inspect |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1022 |
" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1023 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1024 |
"Created: / 14.10.1997 / 17:40:12 / cg" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1025 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1026 |
! |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1027 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1028 |
save:image onStream:aStream |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1029 |
"save image in GIF-file-format onto aStream" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1030 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1031 |
image depth ~~ 8 ifTrue:[ |
3553 | 1032 |
^ Image cannotRepresentImageSignal |
1033 |
raiseWith:image |
|
1034 |
errorString:('GIF (currently) only supports depth8 images'). |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1035 |
]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1036 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
1037 |
outStream := aStream. |
708 | 1038 |
outStream binary. |
1039 |
||
714 | 1040 |
mask := image mask. |
1041 |
mask notNil ifTrue:[ |
|
3553 | 1042 |
self assignTransparentPixelIn:image |
708 | 1043 |
]. |
1044 |
||
1045 |
byteOrder := #lsb. |
|
1046 |
width := image width. |
|
1047 |
height := image height. |
|
1048 |
photometric := image photometric. |
|
1049 |
samplesPerPixel := image samplesPerPixel. |
|
1050 |
bitsPerSample := image bitsPerSample. |
|
1051 |
colorMap := image colorMap. |
|
1052 |
data := image bits. |
|
1053 |
||
1054 |
self writeHeaderFor:image. |
|
714 | 1055 |
maskPixel notNil ifTrue:[ |
3553 | 1056 |
self writeMaskExtensionHeaderFor:image. |
714 | 1057 |
]. |
1058 |
||
708 | 1059 |
self writeBitDataFor:image. |
714 | 1060 |
|
3282 | 1061 |
image imageSequence notEmptyOrNil ifTrue:[ |
3553 | 1062 |
image imageSequence do:[:eachFrame | |
1063 |
outStream nextPut:Extension. |
|
1064 |
outStream nextPut:16rF9. "/ graphic control extension |
|
1065 |
outStream nextPut:4. "/ sub block size |
|
1066 |
outStream nextPut:0. "/ animation type 0 |
|
3658 | 1067 |
outStream nextPutInt16LSB:(eachFrame delay / 10) rounded asInteger. |
3553 | 1068 |
outStream nextPut:0. "/ animation mask |
1069 |
outStream nextPut:0. "/ subblock size |
|
3282 | 1070 |
|
3553 | 1071 |
self writeBitDataFor:eachFrame image. |
3392 | 1072 |
|
3553 | 1073 |
]. |
3282 | 1074 |
]. |
1075 |
||
714 | 1076 |
outStream nextPut: Terminator. |
708 | 1077 |
|
1078 |
" |
|
1079 |
|i| |
|
1080 |
||
1081 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
|
1082 |
GIFReader save:i onFile:'foo.gif'. |
|
1083 |
(Image fromFile:'./foo.gif') inspect |
|
1084 |
" |
|
1085 |
||
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
1086 |
"Created: / 14.10.1997 / 17:40:12 / cg" |
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
1087 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
708 | 1088 |
! ! |
1089 |
||
339 | 1090 |
!GIFReader class methodsFor:'documentation'! |
135 | 1091 |
|
1092 |
version |
|
3553 | 1093 |
^ '$Header$' |
2844 | 1094 |
! |
1095 |
||
1096 |
version_CVS |
|
3553 | 1097 |
^ '$Header$' |
135 | 1098 |
! ! |
1711
b3ba13167ee7
Handle openErrorSignal in preparition for change openErrorSignal
Stefan Vogel <sv@exept.de>
parents:
1521
diff
changeset
|
1099 |
|
3119 | 1100 |
|
43 | 1101 |
GIFReader initialize! |