author | Claus Gittinger <cg@exept.de> |
Wed, 19 Nov 2003 16:28:36 +0100 | |
changeset 1846 | d29322944b05 |
parent 1813 | aa74c7bd22ad |
child 1952 | 5009754ae556 |
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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||
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"{ Package: 'stx:libview2' }" |
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ImageReader subclass:#GIFReader |
1739 | 16 |
instanceVariableNames:'pass xpos ypos rowByteSize remainBitCount bufByte bufStream |
17 |
prefixTable suffixTable clearCode eoiCode freeCode codeSize |
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maxCode interlace frameDelay iterationCount leftOffs topOffs' |
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708 | 19 |
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 |
27 |
" |
|
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COPYRIGHT (c) 1991 by Claus Gittinger |
|
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All Rights Reserved |
21 | 30 |
|
31 |
This software is furnished under a license and may be used |
|
32 |
only in accordance with the terms of that license and with the |
|
33 |
inclusion of the above copyright notice. This software may not |
|
34 |
be provided or otherwise made available to, or used by, any |
|
35 |
other person. No title to or ownership of the software is |
|
36 |
hereby transferred. |
|
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" |
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! |
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||
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documentation |
41 |
" |
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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. |
45 |
GIF extension blocks are not handled. |
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||
47 |
GIF file writing is not implemented (use TIFF). |
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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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||
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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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||
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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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ImageSeparator := $, asciiValue. |
79 |
Extension := $!! asciiValue. |
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Terminator := $; asciiValue. |
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||
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MIMETypes defineImageType:'image/gif' suffix:'gif' reader:self. |
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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 |
90 |
"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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92 |
||
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anImage depth == 8 ifTrue:[^ true]. |
94 |
Transcript showCR:'GIFReader: images depth is ~~ 8.'. |
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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 |
101 |
"return true, if aFileName contains a GIF image" |
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102 |
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103 |
|id inStream| |
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||
9 | 105 |
inStream := self streamReadingFile:aFileName. |
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inStream isNil ifTrue:[^ false]. |
107 |
||
332 | 108 |
inStream text. |
109 |
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id := String new:6. |
111 |
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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]. |
121 |
^ true |
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"Modified: 10.1.1997 / 15:40:34 / cg" |
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! ! |
125 |
||
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!GIFReader methodsFor:'private-reading'! |
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makeGreyscale |
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"not yet implemented/needed" |
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! |
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132 |
readColorMap:colorMapSize |
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"get a gif colormap consisting of colorMapSize entries" |
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|rgbVector| |
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rgbVector := inStream nextBytes:colorMapSize*3. |
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^ MappedPalette rgbBytesVector:rgbVector |
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! |
140 |
||
141 |
readExtension:aStream |
|
882 | 142 |
"get gif89 extension" |
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|
144 |
|type blockSize subBlockSize |
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aspNum aspDen left top width height cWidth cHeight fg bg |
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animationType animationTime animationMask |
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appID appAUTH |
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b ok| |
154 | 149 |
|
150 |
type := aStream nextByte. |
|
151 |
type == $R asciiValue ifTrue:[ |
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"/ |
153 |
"/ Ratio extension |
|
154 |
"/ |
|
155 |
'GIFREADER [info]: ratio extension ignored' infoPrintCR. |
|
156 |
blockSize := aStream nextByte. |
|
157 |
(blockSize == 2) ifTrue:[ |
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aspNum := aStream nextByte. |
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159 |
aspDen := aStream nextByte |
|
160 |
] ifFalse:[ |
|
161 |
aStream skip:blockSize |
|
162 |
]. |
|
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"/ eat subblocks |
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[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
166 |
aStream skip:subBlockSize |
|
167 |
]. |
|
168 |
^ self |
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239 | 169 |
]. |
170 |
||
171 |
type == 16r01 ifTrue:[ |
|
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"/ |
173 |
"/ plaintext extension |
|
174 |
"/ |
|
625 | 175 |
"/ 'GIFREADER [info]: plaintext extension ignored' infoPrintCR. |
882 | 176 |
subBlockSize := aStream nextByte. |
177 |
left := aStream nextShortMSB:false. |
|
178 |
top := aStream nextShortMSB:false. |
|
179 |
width := aStream nextShortMSB:false. |
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180 |
height := aStream nextShortMSB:false. |
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181 |
cWidth := aStream nextByte. |
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182 |
cHeight := aStream nextByte. |
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183 |
fg := aStream nextByte. |
|
184 |
bg := aStream nextByte. |
|
185 |
aStream skip:12. |
|
186 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
|
187 |
aStream skip:subBlockSize |
|
188 |
]. |
|
189 |
^ self |
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239 | 190 |
]. |
191 |
||
192 |
type == 16rF9 ifTrue:[ |
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"/ |
194 |
"/ graphic control extension |
|
195 |
"/ |
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"/ 'GIFREADER [info]: graphic control extension' infoPrintCR. |
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197 |
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[(subBlockSize := aStream nextByte) ~~ 0] whileTrue:[ |
199 |
"/ type bitAnd:1 means: animationMask is transparent pixel |
|
200 |
"/ to be implemented in Image ... |
|
305 | 201 |
|
882 | 202 |
animationType := aStream nextByte. |
203 |
animationTime := aStream nextShortMSB:false. |
|
204 |
animationMask := aStream nextByte. |
|
205 |
subBlockSize := subBlockSize - 4. |
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206 |
|
882 | 207 |
(animationType bitTest: 1) ifTrue:[ |
208 |
maskPixel := animationMask. |
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"/ 'GIFREADER [info]: mask: ' infoPrint. (maskPixel printStringRadix:16) infoPrintCR. |
882 | 210 |
]. |
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"/ 'GIFREADER [info]: animationTime: ' infoPrint. (animationTime * (1/100)) infoPrintCR. |
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"/ 'GIFREADER [info]: animationType: ' infoPrint. (animationType) infoPrintCR. |
213 |
"/ 'GIFREADER [info]: animationMask: ' infoPrint. (animationMask) infoPrintCR. |
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|
214 |
|
888 | 215 |
frameDelay := (animationTime * (1/100)) * 1000. |
216 |
||
882 | 217 |
subBlockSize ~~ 0 ifTrue:[ |
218 |
aStream skip:subBlockSize |
|
219 |
]. |
|
220 |
]. |
|
221 |
^ self |
|
239 | 222 |
]. |
223 |
||
519 | 224 |
type == 16rFE ifTrue:[ |
882 | 225 |
"/ |
226 |
"/ comment extension |
|
227 |
"/ |
|
625 | 228 |
"/ 'GIFREADER [info]: comment extension ignored' infoPrintCR. |
882 | 229 |
[(blockSize := aStream nextByte) ~~ 0] whileTrue:[ |
230 |
aStream skip:blockSize |
|
231 |
]. |
|
232 |
^ self |
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519 | 233 |
]. |
234 |
||
239 | 235 |
type == 16rFF ifTrue:[ |
882 | 236 |
"/ |
237 |
"/ application extension |
|
238 |
"/ |
|
239 |
subBlockSize := aStream nextByte. |
|
240 |
appID := (aStream nextBytes:8 ) asString. |
|
241 |
appAUTH := aStream nextBytes:3. |
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242 |
|
882 | 243 |
subBlockSize := aStream nextByte. |
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244 |
|
882 | 245 |
ok := false. |
246 |
appID = 'NETSCAPE' ifTrue:[ |
|
247 |
appAUTH asString = '2.0' ifTrue:[ |
|
248 |
subBlockSize == 3 ifTrue:[ |
|
249 |
b := aStream nextByte. |
|
250 |
iterationCount := aStream nextShortMSB:false. |
|
251 |
subBlockSize := aStream nextByte. |
|
252 |
ok := true. |
|
888 | 253 |
"/ ('GIFREADER [info]: NETSCAPE application extension - iterationCount = ') infoPrint. |
254 |
"/ iterationCount infoPrintCR. |
|
882 | 255 |
] |
256 |
] |
|
257 |
]. |
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258 |
|
882 | 259 |
ok ifFalse:[ |
260 |
('GIFREADER [info]: application extension (' , appID , ') ignored') infoPrintCR. |
|
261 |
]. |
|
625 | 262 |
|
882 | 263 |
[subBlockSize > 0] whileTrue:[ |
264 |
aStream skip:subBlockSize. |
|
265 |
subBlockSize := aStream nextByte. |
|
266 |
]. |
|
267 |
^ self |
|
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268 |
]. |
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269 |
|
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270 |
type == 16r2C ifTrue:[ |
882 | 271 |
"/ |
272 |
"/ image descriptor extension |
|
273 |
"/ |
|
1429 | 274 |
"/ 'GIFREADER [info]: image descriptor extension ignored' infoPrintCR. |
882 | 275 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
276 |
aStream skip:subBlockSize |
|
277 |
]. |
|
278 |
^ self |
|
239 | 279 |
]. |
280 |
||
281 |
"/ |
|
282 |
"/ unknown extension |
|
283 |
"/ |
|
354
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284 |
'GIFREADER [info]: unknown extension ignored' infoPrintCR. |
239 | 285 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
882 | 286 |
aStream skip:subBlockSize |
154 | 287 |
] |
288 |
||
888 | 289 |
"Modified: / 1.4.1998 / 15:01:18 / cg" |
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! |
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291 |
|
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292 |
readImage:aStream |
882 | 293 |
"read a single image from aStream." |
294 |
||
1429 | 295 |
| flag interlaced hasLocalColorMap bitsPerPixel colorMapSize |
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|
296 |
codeLen compressedData compressedSize index count h tmp srcOffset dstOffset |
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|
297 |
initialBuffSize| |
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298 |
|
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299 |
"get image data" |
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|
300 |
leftOffs := aStream nextShortMSB:false. |
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|
301 |
topOffs := aStream nextShortMSB:false. |
1429 | 302 |
"/ 'GIFReader: leftOffs ' infoPrint. leftOffs infoPrintCR. |
303 |
"/ 'GIFReader: topOffs ' infoPrint. topOffs infoPrintCR. |
|
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|
304 |
width := aStream nextShortMSB:false. |
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|
305 |
height := aStream nextShortMSB:false. |
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|
306 |
|
1846 | 307 |
self reportDimension. |
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|
308 |
|
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309 |
"/ |
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310 |
"/ 'width ' print. width printNewline. |
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|
311 |
"/ 'height ' print. height printNewline. |
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312 |
"/ |
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|
313 |
|
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|
314 |
"another flag byte" |
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|
315 |
flag := aStream nextByte. |
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|
316 |
interlaced := (flag bitAnd:2r01000000) ~~ 0. |
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|
317 |
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
|
318 |
"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
|
319 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
320 |
"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
|
321 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
322 |
hasLocalColorMap ifTrue:[ |
882 | 323 |
"local descr. overwrites" |
324 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
|
325 |
colorMapSize := 1 bitShift:bitsPerPixel. |
|
326 |
"overwrite colormap" |
|
1739 | 327 |
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
|
328 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
329 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
330 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
331 |
"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
|
332 |
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
|
333 |
(aStream respondsTo:#fileSize) ifTrue:[ |
882 | 334 |
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
|
335 |
] ifFalse:[ |
882 | 336 |
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
|
337 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
338 |
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
|
339 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
340 |
"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
|
341 |
index := 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
342 |
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
|
343 |
[count notNil and:[count ~~ 0]] whileTrue:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
344 |
(compressedData size < (index+count)) ifTrue:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
345 |
|t| |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
346 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
347 |
t := ByteArray uninitializedNew:(index+count*3//2). |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
348 |
t replaceBytesFrom:1 to:index-1 with:compressedData startingAt:1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
349 |
compressedData := t. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
350 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
351 |
|
882 | 352 |
aStream nextBytes:count into:compressedData startingAt:index blockSize:4096. |
353 |
index := index + count. |
|
354 |
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
|
355 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
356 |
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
|
357 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
358 |
h := height. |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
359 |
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
|
360 |
"/ '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
|
361 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
362 |
self class decompressGIFFrom:compressedData |
882 | 363 |
count:compressedSize |
364 |
into:data |
|
365 |
startingAt:1 |
|
366 |
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
|
367 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
368 |
interlaced ifTrue:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
369 |
"/ 'GIFREADER: deinterlacing ...' infoPrintCR. |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
370 |
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
|
371 |
|
882 | 372 |
"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
|
373 |
|
882 | 374 |
srcOffset := 1. |
375 |
0 to:(h - 1) by:8 do:[:dstRow | |
|
376 |
dstOffset := dstRow * width + 1. |
|
377 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
378 |
with:data startingAt:srcOffset. |
|
379 |
srcOffset := srcOffset + width. |
|
380 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
381 |
|
882 | 382 |
"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
|
383 |
|
882 | 384 |
4 to:(h - 1) by:8 do:[:dstRow | |
385 |
dstOffset := dstRow * width + 1. |
|
386 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
387 |
with:data startingAt:srcOffset. |
|
388 |
srcOffset := srcOffset + width. |
|
389 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
390 |
|
882 | 391 |
"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
|
392 |
|
882 | 393 |
2 to:(h - 1) by:4 do:[:dstRow | |
394 |
dstOffset := dstRow * width + 1. |
|
395 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
396 |
with:data startingAt:srcOffset. |
|
397 |
srcOffset := srcOffset + width. |
|
398 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
399 |
|
882 | 400 |
"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
|
401 |
|
882 | 402 |
1 to:(h - 1) by:2 do:[:dstRow | |
403 |
dstOffset := dstRow * width + 1. |
|
404 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
405 |
with:data startingAt:srcOffset. |
|
406 |
srcOffset := srcOffset + width. |
|
407 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
408 |
|
882 | 409 |
data := tmp. |
410 |
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
|
411 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
412 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
413 |
"Created: / 13.1.1998 / 10:44:05 / cg" |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
414 |
"Modified: / 12.8.1998 / 13:55:32 / cg" |
0 | 415 |
! ! |
43 | 416 |
|
1805 | 417 |
!GIFReader methodsFor:'private-writing'! |
418 |
||
419 |
assignTransparentPixelIn:image |
|
420 |
"find an usused pixelValue in the colorMap (or image)." |
|
421 |
||
422 |
|cmap usedPixelValues| |
|
423 |
||
424 |
(cmap := image colorMap) size > 0 ifTrue:[ |
|
425 |
cmap size < 256 ifTrue:[ |
|
426 |
maskPixel := cmap size. |
|
427 |
^ self |
|
428 |
] |
|
429 |
]. |
|
430 |
||
431 |
usedPixelValues := image usedValues. |
|
432 |
usedPixelValues size < (1 bitShift:image depth) ifTrue:[ |
|
433 |
"/ there must be an unused pixelValue |
|
434 |
maskPixel := ((0 to:(1 bitShift:image depth)-1) asSet removeAll:(usedPixelValues)) first. |
|
435 |
] ifFalse:[ |
|
436 |
Image informationLostQuerySignal |
|
437 |
raiseWith:image |
|
438 |
errorString:('GIF writer cannot assign a transparent pixel - all pixelValues used by image'). |
|
439 |
] |
|
440 |
! |
|
441 |
||
442 |
checkCodeSize |
|
443 |
(freeCode > maxCode and: [codeSize < 12]) |
|
444 |
ifTrue: |
|
445 |
[codeSize := codeSize + 1. |
|
446 |
maxCode := (1 bitShift: codeSize) - 1] |
|
447 |
||
448 |
"Created: 14.10.1997 / 18:42:01 / cg" |
|
449 |
! |
|
450 |
||
451 |
flushBits |
|
452 |
remainBitCount = 0 |
|
453 |
ifFalse: |
|
454 |
[self nextBytePut: bufByte. |
|
455 |
remainBitCount := 0]. |
|
456 |
self flushBuffer |
|
457 |
||
458 |
"Modified: 14.10.1997 / 18:58:06 / cg" |
|
459 |
! |
|
460 |
||
461 |
flushBuffer |
|
462 |
bufStream isEmpty ifTrue: [^ self]. |
|
463 |
outStream nextPut: bufStream size. |
|
464 |
outStream nextPutAll: bufStream contents. |
|
465 |
bufStream := WriteStream on: (ByteArray new: 256) |
|
466 |
||
467 |
"Modified: 14.10.1997 / 20:46:04 / cg" |
|
468 |
! |
|
469 |
||
470 |
flushCode |
|
471 |
self flushBits |
|
472 |
||
473 |
"Created: 14.10.1997 / 18:57:33 / cg" |
|
474 |
! |
|
475 |
||
476 |
nextBitsPut: anInteger |
|
477 |
| integer writeBitCount shiftCount | |
|
478 |
shiftCount := 0. |
|
479 |
remainBitCount = 0 |
|
480 |
ifTrue: |
|
481 |
[writeBitCount := 8. |
|
482 |
integer := anInteger] |
|
483 |
ifFalse: |
|
484 |
[writeBitCount := remainBitCount. |
|
485 |
integer := bufByte + (anInteger bitShift: 8 - remainBitCount)]. |
|
486 |
[writeBitCount < codeSize] |
|
487 |
whileTrue: |
|
488 |
[self nextBytePut: ((integer bitShift: shiftCount) bitAnd: 255). |
|
489 |
shiftCount := shiftCount - 8. |
|
490 |
writeBitCount := writeBitCount + 8]. |
|
491 |
(remainBitCount := writeBitCount - codeSize) = 0 |
|
492 |
ifTrue: [self nextBytePut: (integer bitShift: shiftCount)] |
|
493 |
ifFalse: [bufByte := integer bitShift: shiftCount]. |
|
494 |
^anInteger |
|
495 |
||
496 |
"Modified: 15.10.1997 / 16:50:30 / cg" |
|
497 |
! |
|
498 |
||
499 |
nextBytePut: aByte |
|
500 |
bufStream nextPut: aByte. |
|
501 |
bufStream size >= 254 ifTrue: [self flushBuffer] |
|
502 |
||
503 |
"Modified: 15.10.1997 / 16:50:52 / cg" |
|
504 |
! |
|
505 |
||
506 |
readPixelFrom: bits |
|
507 |
| pixel | |
|
508 |
ypos >= height ifTrue: [^ nil]. |
|
509 |
(maskPixel notNil |
|
510 |
and:[(mask pixelAtX:xpos y:ypos) == 0]) ifTrue:[ |
|
511 |
pixel := maskPixel |
|
512 |
] ifFalse:[ |
|
513 |
pixel := bits at: ypos * rowByteSize + xpos + 1. |
|
514 |
]. |
|
515 |
self updatePixelPosition. |
|
516 |
^ pixel |
|
517 |
||
518 |
"Created: 14.10.1997 / 18:43:50 / cg" |
|
519 |
"Modified: 15.10.1997 / 16:46:43 / cg" |
|
520 |
! |
|
521 |
||
522 |
setParameters:bitsPerPixel |
|
523 |
clearCode := 1 bitShift:bitsPerPixel. |
|
524 |
eoiCode := clearCode + 1. |
|
525 |
freeCode := clearCode + 2. |
|
526 |
codeSize := bitsPerPixel + 1. |
|
527 |
maxCode := (1 bitShift: codeSize) - 1 |
|
528 |
||
529 |
"Modified: 14.10.1997 / 20:09:48 / cg" |
|
530 |
! |
|
531 |
||
532 |
updatePixelPosition |
|
533 |
(xpos := xpos + 1) >= width ifFalse: [^ self]. |
|
534 |
||
535 |
xpos := 0. |
|
536 |
interlace == true ifFalse:[ |
|
537 |
ypos := ypos + 1. |
|
538 |
^ self |
|
539 |
]. |
|
540 |
||
541 |
pass == 0 ifTrue:[ |
|
542 |
(ypos := ypos + 8) >= height ifTrue:[ |
|
543 |
pass := pass + 1. |
|
544 |
ypos := 4 |
|
545 |
]. |
|
546 |
^ self |
|
547 |
]. |
|
548 |
pass == 1 ifTrue:[ |
|
549 |
(ypos := ypos + 8) >= height ifTrue:[ |
|
550 |
pass := pass + 1. |
|
551 |
ypos := 2 |
|
552 |
]. |
|
553 |
^ self |
|
554 |
]. |
|
555 |
pass == 2 ifTrue:[ |
|
556 |
(ypos := ypos + 4) >= height ifTrue:[ |
|
557 |
pass := pass + 1. |
|
558 |
ypos := 1 |
|
559 |
]. |
|
560 |
^ self |
|
561 |
]. |
|
562 |
pass == 3 ifTrue:[ |
|
563 |
ypos := ypos + 2. |
|
564 |
^ self |
|
565 |
]. |
|
566 |
^ self error: 'can''t happen' |
|
567 |
||
568 |
"Modified: 14.10.1997 / 18:44:27 / cg" |
|
569 |
! |
|
570 |
||
571 |
writeCode: aCode |
|
572 |
self nextBitsPut: aCode |
|
573 |
||
574 |
"Created: 14.10.1997 / 18:38:35 / cg" |
|
575 |
"Modified: 15.10.1997 / 17:01:47 / cg" |
|
576 |
! |
|
577 |
||
578 |
writeCodeAndCheckCodeSize: t1 |
|
579 |
self writeCode: t1. |
|
580 |
self checkCodeSize |
|
581 |
||
582 |
"Created: 14.10.1997 / 18:38:24 / cg" |
|
583 |
"Modified: 14.10.1997 / 18:40:56 / cg" |
|
584 |
! ! |
|
585 |
||
586 |
!GIFReader methodsFor:'reading'! |
|
587 |
||
588 |
fromStream:aStream |
|
589 |
"read a stream containing a GIF image (or an image sequence). |
|
590 |
Leave image description in instance variables." |
|
591 |
||
592 |
|byte index flag count fileColorMap |
|
593 |
colorMapSize bitsPerPixel scrWidth scrHeight |
|
594 |
hasColorMap hasLocalColorMap interlaced id |
|
595 |
codeLen |
|
596 |
compressedData compressedSize |
|
597 |
tmp srcOffset dstOffset isGif89 atEnd |
|
598 |
h "{ Class: SmallInteger }" |
|
599 |
img firstImage firstOffset firstFrameDelay frame imageCount| |
|
600 |
||
601 |
inStream := aStream. |
|
602 |
aStream binary. |
|
603 |
||
604 |
"GIF-files are always lsb (intel-world)" |
|
605 |
byteOrder := #lsb. |
|
606 |
||
607 |
id := ByteArray new:6. |
|
608 |
(aStream nextBytes:6 into:id startingAt:1) ~~ 6 ifTrue:[ |
|
609 |
^ self fileFormatError:'not a gif file (short read)'. |
|
610 |
]. |
|
611 |
id := id asString. |
|
612 |
||
613 |
"all I had for testing where GIF87a files; |
|
614 |
I hope later versions work too ..." |
|
615 |
||
616 |
isGif89 := false. |
|
617 |
(id ~= 'GIF87a') ifTrue:[ |
|
618 |
(id startsWith:'GIF') ifFalse:[ |
|
619 |
^ self fileFormatError:('not a gif file (id=''' , id , ''')'). |
|
620 |
]. |
|
621 |
id ~= 'GIF89a' ifTrue:[ |
|
622 |
'GIFReader [info]: not a GIF87a/GIF89a file - hope that works' infoPrintCR. |
|
623 |
] |
|
624 |
]. |
|
625 |
||
626 |
"get screen dimensions (not used)" |
|
627 |
scrWidth := aStream nextShortMSB:false. |
|
628 |
scrHeight := aStream nextShortMSB:false. |
|
629 |
||
630 |
"get flag byte" |
|
631 |
flag := aStream nextByte. |
|
632 |
hasColorMap := (flag bitAnd:2r10000000) ~~ 0. |
|
633 |
"bitsPerRGB := ((flag bitAnd:2r01110000) bitShift:-4) + 1. " |
|
634 |
"colorMapSorted := ((flag bitAnd:2r00001000) ~~ 0. " |
|
635 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
|
636 |
colorMapSize := 1 bitShift:bitsPerPixel. |
|
637 |
||
638 |
"get background (not used)" |
|
639 |
aStream nextByte. |
|
640 |
||
641 |
"aspect ratio (not used)" |
|
642 |
aStream nextByte. |
|
643 |
||
644 |
"get colorMap" |
|
645 |
hasColorMap ifTrue:[ |
|
646 |
fileColorMap := self readColorMap:colorMapSize. |
|
647 |
]. |
|
648 |
colorMap := fileColorMap. |
|
649 |
||
650 |
photometric := #palette. |
|
651 |
samplesPerPixel := 1. |
|
652 |
bitsPerSample := #(8). |
|
653 |
||
654 |
imageCount := 0. |
|
655 |
atEnd := false. |
|
656 |
[atEnd] whileFalse:[ |
|
657 |
"gif89a extensions" |
|
658 |
||
659 |
byte := aStream nextByte. |
|
660 |
byte == Extension ifTrue:[ |
|
661 |
"/ 'Ext' infoPrintCR. |
|
662 |
self readExtension:aStream. |
|
663 |
] ifFalse:[ |
|
664 |
(byte == Terminator) ifTrue:[ |
|
665 |
atEnd := true |
|
666 |
] ifFalse:[ |
|
667 |
"must be image separator" |
|
668 |
(byte ~~ ImageSeparator) ifTrue:[ |
|
669 |
^ self fileFormatError:('corrupted gif file (no IMAGESEP): ' , (byte printStringRadix:16)). |
|
670 |
]. |
|
671 |
"/ 'Img' infoPrintCR. |
|
672 |
||
673 |
fileColorMap notNil ifTrue:[ |
|
674 |
colorMap := fileColorMap. |
|
675 |
]. |
|
676 |
Object primitiveFailureSignal handle:[:ex | |
|
677 |
^ self fileFormatError:('corrupted gif file'). |
|
678 |
] do:[ |
|
679 |
self readImage:aStream. |
|
680 |
]. |
|
681 |
||
682 |
maskPixel notNil ifTrue:[ |
|
683 |
"/ |
|
684 |
"/ ok, there is a maskValue |
|
685 |
"/ build a Depth1Image for it. |
|
686 |
"/ |
|
687 |
self buildMaskFromColor:maskPixel |
|
688 |
]. |
|
689 |
||
690 |
imageCount == 0 ifTrue:[ |
|
691 |
img := self makeImage. |
|
692 |
"/ remember first image in case more come later. |
|
693 |
firstImage := img. |
|
694 |
firstFrameDelay := frameDelay. |
|
695 |
firstOffset := (leftOffs @ topOffs). |
|
696 |
] ifFalse:[ |
|
697 |
imageCount == 1 ifTrue:[ |
|
698 |
imageSequence := ImageSequence new. |
|
699 |
img imageSequence:imageSequence. |
|
700 |
||
701 |
"/ add frame for first image. |
|
702 |
frame := ImageFrame new image:firstImage. |
|
703 |
frame delay:firstFrameDelay. |
|
704 |
frame offset:firstOffset. |
|
705 |
imageSequence add:frame. |
|
706 |
]. |
|
707 |
img := self makeImage. |
|
708 |
img imageSequence:imageSequence. |
|
709 |
||
710 |
"/ add frame for this image. |
|
711 |
frame := ImageFrame new image:img. |
|
712 |
frame delay:frameDelay. |
|
713 |
frame offset:(leftOffs @ topOffs). |
|
714 |
imageSequence add:frame. |
|
715 |
]. |
|
716 |
||
717 |
imageCount := imageCount + 1. |
|
718 |
||
719 |
frameDelay := nil. |
|
720 |
||
721 |
aStream atEnd ifTrue:[ |
|
722 |
atEnd := true. |
|
723 |
] |
|
724 |
] |
|
725 |
]. |
|
726 |
]. |
|
727 |
||
728 |
imageSequence notNil ifTrue:[ |
|
729 |
iterationCount notNil ifTrue:[ |
|
730 |
iterationCount == 0 ifTrue:[ |
|
731 |
imageSequence loop:true. |
|
732 |
] ifFalse:[ |
|
733 |
imageSequence loop:false. |
|
734 |
imageSequence iterationCount:iterationCount. |
|
735 |
] |
|
736 |
] |
|
737 |
]. |
|
738 |
||
739 |
" |
|
740 |
Image fromFile:'/home/cg/work/stx/goodies/bitmaps/gifImages/animated/vrml.gif' |
|
741 |
Image fromFile:'/home/cg/work/stx/goodies/bitmaps/gifImages/animated/arrow.gif' |
|
742 |
" |
|
743 |
||
744 |
"Modified: / 5.7.1996 / 17:32:01 / stefan" |
|
745 |
"Modified: / 21.8.1998 / 22:20:00 / cg" |
|
746 |
! ! |
|
747 |
||
708 | 748 |
!GIFReader methodsFor:'writing to file'! |
749 |
||
750 |
save:image onFile:aFileName |
|
751 |
"save image as GIF file on aFileName" |
|
752 |
||
1813
aa74c7bd22ad
image saving - use save:onStream:
Claus Gittinger <cg@exept.de>
parents:
1811
diff
changeset
|
753 |
|convertedImage| |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
754 |
|
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
755 |
image depth ~~ 8 ifTrue:[ |
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
756 |
Image errorSignal handle:[:ex | |
1811 | 757 |
^ Image cannotRepresentImageSignal |
758 |
raiseWith:image |
|
759 |
errorString:('GIF failed to convert image to depth8: ', ex description). |
|
760 |
"/ ex return. |
|
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
761 |
] do:[ |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
762 |
convertedImage := Image newForDepth:8. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
763 |
convertedImage fromImage:image photometric:#palette. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
764 |
]. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
765 |
convertedImage notNil ifTrue:[ |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
766 |
^ self save:convertedImage onFile:aFileName |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
767 |
]. |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
768 |
^ Image cannotRepresentImageSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
769 |
raiseWith:image |
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
770 |
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
|
771 |
]. |
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
772 |
|
1813
aa74c7bd22ad
image saving - use save:onStream:
Claus Gittinger <cg@exept.de>
parents:
1811
diff
changeset
|
773 |
super save:image onFile:aFileName. |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
774 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
775 |
" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
776 |
|i| |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
777 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
778 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
779 |
GIFReader save:i onFile:'foo.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
780 |
(Image fromFile:'./foo.gif') inspect |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
781 |
" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
782 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
783 |
"Created: / 14.10.1997 / 17:40:12 / cg" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
784 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
785 |
! |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
786 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
787 |
save:image onStream:aStream |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
788 |
"save image in GIF-file-format onto aStream" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
789 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
790 |
image depth ~~ 8 ifTrue:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
791 |
^ Image cannotRepresentImageSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
792 |
raiseWith:image |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
793 |
errorString:('GIF (currently) only supports depth8 images'). |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
794 |
]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
795 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
796 |
outStream := aStream. |
708 | 797 |
outStream binary. |
798 |
||
714 | 799 |
mask := image mask. |
800 |
mask notNil ifTrue:[ |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
801 |
self assignTransparentPixelIn:image |
708 | 802 |
]. |
803 |
||
804 |
byteOrder := #lsb. |
|
805 |
width := image width. |
|
806 |
height := image height. |
|
807 |
photometric := image photometric. |
|
808 |
samplesPerPixel := image samplesPerPixel. |
|
809 |
bitsPerSample := image bitsPerSample. |
|
810 |
colorMap := image colorMap. |
|
811 |
data := image bits. |
|
812 |
||
813 |
self writeHeaderFor:image. |
|
714 | 814 |
maskPixel notNil ifTrue:[ |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
815 |
self writeMaskExtensionHeaderFor:image. |
714 | 816 |
]. |
817 |
||
708 | 818 |
self writeBitDataFor:image. |
714 | 819 |
|
820 |
outStream nextPut: Terminator. |
|
708 | 821 |
|
822 |
" |
|
823 |
|i| |
|
824 |
||
825 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
|
826 |
GIFReader save:i onFile:'foo.gif'. |
|
827 |
(Image fromFile:'./foo.gif') inspect |
|
828 |
" |
|
829 |
||
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
830 |
"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
|
831 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
708 | 832 |
! |
833 |
||
710 | 834 |
writeBitDataFor: image |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
835 |
"using modified Lempel-Ziv Welch algorithm." |
710 | 836 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
837 |
| bits bitsPerPixel t1 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
838 |
maxBits maxMaxCode tSize initCodeSize ent tShift fCode pixel index disp nomatch | |
710 | 839 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
840 |
outStream nextPut:ImageSeparator. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
841 |
self writeShort:0. "/ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
842 |
self writeShort:0. "/ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
843 |
self writeShort:width. "/ image size |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
844 |
self writeShort:height. |
714 | 845 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
846 |
interlace == true ifTrue:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
847 |
t1 := 64 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
848 |
] ifFalse:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
849 |
t1 := 0 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
850 |
]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
851 |
outStream nextPut:t1. "/ another flag |
714 | 852 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
853 |
bitsPerPixel := image bitsPerPixel. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
854 |
bits := image bits. |
710 | 855 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
856 |
pass := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
857 |
xpos := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
858 |
ypos := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
859 |
rowByteSize := image bytesPerRow. "/ width * 8 + 31 // 32 * 4. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
860 |
remainBitCount := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
861 |
bufByte := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
862 |
bufStream := WriteStream on: (ByteArray new: 256). |
708 | 863 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
864 |
maxBits := 12. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
865 |
maxMaxCode := 1 bitShift: maxBits. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
866 |
tSize := 5003. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
867 |
prefixTable := Array new: tSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
868 |
suffixTable := Array new: tSize. |
710 | 869 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
870 |
initCodeSize := bitsPerPixel <= 1 ifTrue: [2] ifFalse: [bitsPerPixel]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
871 |
outStream nextPut: initCodeSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
872 |
self setParameters: initCodeSize. |
710 | 873 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
874 |
tShift := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
875 |
fCode := tSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
876 |
[fCode < 65536] whileTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
877 |
[tShift := tShift + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
878 |
fCode := fCode * 2]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
879 |
tShift := 8 - tShift. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
880 |
1 to: tSize do: [:i | suffixTable at: i put: -1]. |
708 | 881 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
882 |
self writeCodeAndCheckCodeSize: clearCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
883 |
ent := self readPixelFrom: bits. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
884 |
[(pixel := self readPixelFrom: bits) == nil] whileFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
885 |
[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
886 |
fCode := (pixel bitShift: maxBits) + ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
887 |
index := ((pixel bitShift: tShift) bitXor: ent) + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
888 |
(suffixTable at: index) = fCode |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
889 |
ifTrue: [ent := prefixTable at: index] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
890 |
ifFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
891 |
[nomatch := true. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
892 |
(suffixTable at: index) >= 0 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
893 |
ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
894 |
[disp := tSize - index + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
895 |
index = 1 ifTrue: [disp := 1]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
896 |
"probe" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
897 |
[(index := index - disp) < 1 ifTrue: [index := index + tSize]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
898 |
(suffixTable at: index) = fCode |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
899 |
ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
900 |
[ent := prefixTable at: index. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
901 |
nomatch := false. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
902 |
"continue whileFalse:"]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
903 |
nomatch and: [(suffixTable at: index) > 0]] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
904 |
whileTrue: ["probe"]]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
905 |
"nomatch" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
906 |
nomatch ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
907 |
[self writeCodeAndCheckCodeSize: ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
908 |
ent := pixel. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
909 |
freeCode < maxMaxCode |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
910 |
ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
911 |
[prefixTable at: index put: freeCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
912 |
suffixTable at: index put: fCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
913 |
freeCode := freeCode + 1] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
914 |
ifFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
915 |
[self writeCodeAndCheckCodeSize: clearCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
916 |
1 to: tSize do: [:i | suffixTable at: i put: -1]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
917 |
self setParameters: initCodeSize]]]]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
918 |
prefixTable := suffixTable := nil. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
919 |
self writeCodeAndCheckCodeSize: ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
920 |
self writeCodeAndCheckCodeSize: eoiCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
921 |
self flushCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
922 |
outStream nextPut: 0. "zero-length packet" |
710 | 923 |
|
712 | 924 |
"Modified: 15.10.1997 / 19:56:28 / cg" |
708 | 925 |
! |
926 |
||
927 |
writeHeaderFor:image |
|
714 | 928 |
"write the gif header" |
708 | 929 |
|
1755 | 930 |
|bitsPerPixel t1| |
708 | 931 |
|
932 |
bitsPerPixel := image bitsPerPixel. |
|
933 |
||
732 | 934 |
outStream nextPutAll: 'GIF89a' asByteArray. |
712 | 935 |
self writeShort:width. "/ screen size |
936 |
self writeShort:height. |
|
708 | 937 |
t1 := 128. |
712 | 938 |
t1 := t1 bitOr:(bitsPerPixel - 1 bitShift:5). |
939 |
t1 := t1 bitOr:(bitsPerPixel - 1). |
|
940 |
outStream nextPut:t1. "/ flag |
|
941 |
outStream nextPut:0. "/ background (not used) |
|
942 |
outStream nextPut:0. "/ aspect ratio |
|
708 | 943 |
|
713 | 944 |
0 to:(1 bitShift:bitsPerPixel)-1 do:[:pixel | |
1755 | 945 |
|clr red green blue| |
712 | 946 |
|
1755 | 947 |
clr := image colorFromValue:pixel. |
948 |
clr isNil ifTrue:[ |
|
949 |
"/ unused colorMap slot |
|
950 |
red := green := blue := 0. |
|
951 |
] ifFalse:[ |
|
952 |
red := (clr redByte). |
|
953 |
green := (clr greenByte). |
|
954 |
blue := (clr blueByte). |
|
955 |
]. |
|
956 |
outStream |
|
957 |
nextPut:red; nextPut:green; nextPut:blue. |
|
713 | 958 |
]. |
708 | 959 |
|
732 | 960 |
"Created: / 14.10.1997 / 17:41:28 / cg" |
961 |
"Modified: / 31.10.1997 / 16:12:13 / cg" |
|
714 | 962 |
! |
963 |
||
964 |
writeMaskExtensionHeaderFor:image |
|
965 |
"write an extension header for the transparent pixel" |
|
966 |
||
967 |
outStream nextPut:Extension. |
|
968 |
outStream nextPut:16rF9. "/ graphic control extension |
|
969 |
outStream nextPut:4. "/ subBlockSize |
|
970 |
||
971 |
outStream nextPut:1. "/ animationType |
|
972 |
outStream nextPutShort:1 MSB:false. "/ animationTime |
|
973 |
outStream nextPut:maskPixel. "/ animationMask |
|
974 |
||
975 |
outStream nextPut:0. |
|
708 | 976 |
! ! |
977 |
||
339 | 978 |
!GIFReader class methodsFor:'documentation'! |
135 | 979 |
|
980 |
version |
|
1846 | 981 |
^ '$Header: /cvs/stx/stx/libview2/GIFReader.st,v 1.89 2003-11-19 15:28:00 cg Exp $' |
135 | 982 |
! ! |
1711
b3ba13167ee7
Handle openErrorSignal in preparition for change openErrorSignal
Stefan Vogel <sv@exept.de>
parents:
1521
diff
changeset
|
983 |
|
43 | 984 |
GIFReader initialize! |