author | Claus Gittinger <cg@exept.de> |
Fri, 31 Jul 2009 10:49:05 +0200 | |
changeset 2694 | 54871b04e18f |
parent 2596 | da5ad69ff368 |
child 2844 | ce205334bcdc |
permissions | -rw-r--r-- |
0 | 1 |
" |
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COPYRIGHT (c) 1991 by Claus Gittinger |
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All Rights Reserved |
0 | 4 |
|
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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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"{ Package: 'stx:libview2' }" |
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0 | 14 |
ImageReader subclass:#GIFReader |
1739 | 15 |
instanceVariableNames:'pass xpos ypos rowByteSize remainBitCount bufByte bufStream |
16 |
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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||
339 | 23 |
!GIFReader class methodsFor:'documentation'! |
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|
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copyright |
26 |
" |
|
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COPYRIGHT (c) 1991 by Claus Gittinger |
|
26 | 28 |
All Rights Reserved |
21 | 29 |
|
30 |
This software is furnished under a license and may be used |
|
31 |
only in accordance with the terms of that license and with the |
|
32 |
inclusion of the above copyright notice. This software may not |
|
33 |
be provided or otherwise made available to, or used by, any |
|
34 |
other person. No title to or ownership of the software is |
|
35 |
hereby transferred. |
|
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" |
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! |
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||
0 | 39 |
documentation |
40 |
" |
|
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this class provides methods for loading and saving GIF pictures. |
|
21 | 42 |
It has been tested with some different GIF87a pictures, I dont |
0 | 43 |
know, if it works with other GIF versions. |
44 |
GIF extension blocks are not handled. |
|
45 |
||
46 |
GIF file writing is not implemented (use TIFF). |
|
47 |
||
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legal stuff extracted from GIF87a documentation: |
0 | 49 |
|
50 |
CompuServe Incorporated hereby grants a limited, non-exclusive, royalty-free |
|
51 |
license for the use of the Graphics Interchange Format(sm) in computer |
|
52 |
software; computer software utilizing GIF(sm) must acknowledge ownership of the |
|
53 |
Graphics Interchange Format and its Service Mark by CompuServe Incorporated, in |
|
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User and Technical Documentation. |
|
55 |
||
56 |
The Graphics Interchange Format(c) is the Copyright property of |
|
57 |
CompuServe Incorporated. GIF(sm) is a Service Mark property of |
|
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CompuServe Incorporated. |
|
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|
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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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|
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[author:] |
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Claus Gittinger |
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" |
69 |
! ! |
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||
339 | 71 |
!GIFReader class methodsFor:'initialization'! |
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|
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initialize |
|
198 | 74 |
"install myself in the Image classes fileFormat table |
398 | 75 |
for the `.gif' extensions." |
198 | 76 |
|
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ImageSeparator := $, codePoint. |
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Extension := $!! codePoint. |
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Terminator := $; codePoint. |
708 | 80 |
|
647 | 81 |
MIMETypes defineImageType:'image/gif' suffix:'gif' reader:self. |
198 | 82 |
|
708 | 83 |
"Modified: 14.10.1997 / 18:47:27 / cg" |
26 | 84 |
! ! |
85 |
||
339 | 86 |
!GIFReader class methodsFor:'testing'! |
1 | 87 |
|
713 | 88 |
canRepresent:anImage |
89 |
"return true, if anImage can be represented in my file format. |
|
90 |
GIF supports depth 8 images only." |
|
91 |
||
1521 | 92 |
anImage depth == 8 ifTrue:[^ true]. |
2030 | 93 |
('GIFReader [info]: images depth is ~~ 8.') infoPrintCR. |
94 |
^ false. |
|
713 | 95 |
|
96 |
"Created: 17.10.1997 / 20:19:20 / cg" |
|
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! |
|
98 |
||
1 | 99 |
isValidImageFile:aFileName |
100 |
"return true, if aFileName contains a GIF image" |
|
101 |
||
102 |
|id inStream| |
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103 |
||
9 | 104 |
inStream := self streamReadingFile:aFileName. |
1 | 105 |
inStream isNil ifTrue:[^ false]. |
106 |
||
332 | 107 |
inStream text. |
108 |
||
1 | 109 |
id := String new:6. |
110 |
inStream nextBytes:6 into:id. |
|
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inStream close. |
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112 |
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113 |
(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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]. |
120 |
^ true |
|
174 | 121 |
|
355 | 122 |
"Modified: 10.1.1997 / 15:40:34 / cg" |
1 | 123 |
! ! |
124 |
||
2694 | 125 |
!GIFReader methodsFor:'image reading'! |
154 | 126 |
|
2596 | 127 |
fromStream:aStream |
128 |
"read a stream containing a GIF image (or an image sequence). |
|
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Leave image description in instance variables." |
|
130 |
||
131 |
|byte index flag count fileColorMap |
|
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colorMapSize bitsPerPixel scrWidth scrHeight |
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hasColorMap hasLocalColorMap interlaced id |
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codeLen |
|
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compressedData compressedSize |
|
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tmp srcOffset dstOffset isGif89 atEnd |
|
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h "{ Class: SmallInteger }" |
|
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img firstImage firstOffset firstFrameDelay frame imageCount| |
|
139 |
||
140 |
inStream := aStream. |
|
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aStream binary. |
|
142 |
||
143 |
"GIF-files are always lsb (intel-world)" |
|
144 |
byteOrder := #lsb. |
|
145 |
||
146 |
id := ByteArray new:6. |
|
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(aStream nextBytes:6 into:id startingAt:1) ~~ 6 ifTrue:[ |
|
148 |
^ self fileFormatError:'not a gif file (short read)'. |
|
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]. |
|
150 |
id := id asString. |
|
151 |
||
152 |
"all I had for testing where GIF87a files; |
|
153 |
I hope later versions work too ..." |
|
154 |
||
155 |
isGif89 := false. |
|
156 |
(id ~= 'GIF87a') ifTrue:[ |
|
157 |
(id startsWith:'GIF') ifFalse:[ |
|
158 |
^ self fileFormatError:('not a gif file (id=''' , id , ''')'). |
|
159 |
]. |
|
160 |
id ~= 'GIF89a' ifTrue:[ |
|
161 |
'GIFReader [info]: not a GIF87a/GIF89a file - hope that works' infoPrintCR. |
|
162 |
] |
|
163 |
]. |
|
164 |
||
165 |
"get screen dimensions (not used)" |
|
166 |
scrWidth := aStream nextShortMSB:false. |
|
167 |
scrHeight := aStream nextShortMSB:false. |
|
168 |
||
169 |
"get flag byte" |
|
170 |
flag := aStream nextByte. |
|
171 |
hasColorMap := (flag bitAnd:2r10000000) ~~ 0. |
|
172 |
"bitsPerRGB := ((flag bitAnd:2r01110000) bitShift:-4) + 1. " |
|
173 |
"colorMapSorted := ((flag bitAnd:2r00001000) ~~ 0. " |
|
174 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
|
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colorMapSize := 1 bitShift:bitsPerPixel. |
|
176 |
||
177 |
"get background (not used)" |
|
178 |
aStream nextByte. |
|
179 |
||
180 |
"aspect ratio (not used)" |
|
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aStream nextByte. |
|
182 |
||
183 |
"get colorMap" |
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hasColorMap ifTrue:[ |
|
185 |
fileColorMap := self readColorMap:colorMapSize. |
|
186 |
]. |
|
187 |
colorMap := fileColorMap. |
|
188 |
||
189 |
photometric := #palette. |
|
190 |
samplesPerPixel := 1. |
|
191 |
bitsPerSample := #(8). |
|
192 |
||
193 |
imageCount := 0. |
|
194 |
atEnd := false. |
|
195 |
[atEnd] whileFalse:[ |
|
196 |
"gif89a extensions" |
|
197 |
||
198 |
byte := aStream nextByte. |
|
199 |
byte isNil ifTrue:[ |
|
200 |
"/ atEnd-Terminator missing |
|
201 |
atEnd := true |
|
202 |
] ifFalse:[ |
|
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byte == Extension ifTrue:[ |
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"/ 'Ext' infoPrintCR. |
|
205 |
self readExtension:aStream. |
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206 |
] ifFalse:[ |
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207 |
(byte == Terminator) ifTrue:[ |
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208 |
atEnd := true |
|
209 |
] ifFalse:[ |
|
210 |
"must be image separator" |
|
211 |
(byte ~~ ImageSeparator) ifTrue:[ |
|
212 |
^ self fileFormatError:('corrupted gif file (no IMAGESEP): ' , (byte printStringRadix:16)). |
|
213 |
]. |
|
214 |
"/ 'Img' infoPrintCR. |
|
215 |
||
216 |
fileColorMap notNil ifTrue:[ |
|
217 |
colorMap := fileColorMap. |
|
218 |
]. |
|
219 |
Object primitiveFailureSignal handle:[:ex | |
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220 |
^ self fileFormatError:('corrupted gif file'). |
|
221 |
] do:[ |
|
222 |
self readImage:aStream. |
|
223 |
]. |
|
224 |
||
225 |
maskPixel notNil ifTrue:[ |
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226 |
"/ |
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227 |
"/ ok, there is a maskValue |
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228 |
"/ build a Depth1Image for it. |
|
229 |
"/ |
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230 |
self buildMaskFromColor:maskPixel |
|
231 |
]. |
|
232 |
||
233 |
imageCount == 0 ifTrue:[ |
|
234 |
img := self makeImage. |
|
235 |
"/ remember first image in case more come later. |
|
236 |
firstImage := img. |
|
237 |
firstFrameDelay := frameDelay. |
|
238 |
firstOffset := (leftOffs @ topOffs). |
|
239 |
] ifFalse:[ |
|
240 |
imageCount == 1 ifTrue:[ |
|
241 |
imageSequence := ImageSequence new. |
|
242 |
img imageSequence:imageSequence. |
|
243 |
||
244 |
"/ add frame for first image. |
|
245 |
frame := ImageFrame new image:firstImage. |
|
246 |
frame delay:firstFrameDelay. |
|
247 |
frame offset:firstOffset. |
|
248 |
imageSequence add:frame. |
|
249 |
]. |
|
250 |
img := self makeImage. |
|
251 |
img imageSequence:imageSequence. |
|
252 |
||
253 |
"/ add frame for this image. |
|
254 |
frame := ImageFrame new image:img. |
|
255 |
frame delay:frameDelay. |
|
256 |
frame offset:(leftOffs @ topOffs). |
|
257 |
imageSequence add:frame. |
|
258 |
]. |
|
259 |
||
260 |
imageCount := imageCount + 1. |
|
261 |
||
262 |
frameDelay := nil. |
|
263 |
||
264 |
aStream atEnd ifTrue:[ |
|
265 |
atEnd := true. |
|
266 |
] |
|
267 |
] |
|
268 |
]. |
|
269 |
]. |
|
270 |
]. |
|
271 |
||
272 |
imageSequence notNil ifTrue:[ |
|
273 |
iterationCount notNil ifTrue:[ |
|
274 |
iterationCount == 0 ifTrue:[ |
|
275 |
imageSequence loop:true. |
|
276 |
] ifFalse:[ |
|
277 |
imageSequence loop:false. |
|
278 |
imageSequence iterationCount:iterationCount. |
|
279 |
] |
|
280 |
] |
|
281 |
]. |
|
282 |
||
283 |
" |
|
284 |
Image fromFile:'/home/cg/work/stx/goodies/bitmaps/gifImages/animated/vrml.gif' |
|
285 |
Image fromFile:'/home/cg/work/stx/goodies/bitmaps/gifImages/animated/arrow.gif' |
|
286 |
" |
|
287 |
||
288 |
"Modified: / 5.7.1996 / 17:32:01 / stefan" |
|
289 |
"Modified: / 21.8.1998 / 22:20:00 / cg" |
|
2694 | 290 |
! ! |
291 |
||
292 |
!GIFReader methodsFor:'private-reading'! |
|
293 |
||
294 |
makeGreyscale |
|
295 |
"not yet implemented/needed" |
|
296 |
! |
|
297 |
||
298 |
readColorMap:colorMapSize |
|
299 |
"get a gif colormap consisting of colorMapSize entries" |
|
300 |
||
301 |
|rgbVector| |
|
302 |
||
303 |
rgbVector := inStream nextBytes:colorMapSize*3. |
|
304 |
^ MappedPalette rgbBytesVector:rgbVector |
|
2596 | 305 |
! |
306 |
||
154 | 307 |
readExtension:aStream |
882 | 308 |
"get gif89 extension" |
154 | 309 |
|
310 |
|type blockSize subBlockSize |
|
304 | 311 |
aspNum aspDen left top width height cWidth cHeight fg bg |
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312 |
animationType animationTime animationMask |
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313 |
appID appAUTH |
888 | 314 |
b ok| |
154 | 315 |
|
316 |
type := aStream nextByte. |
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|
317 |
type == $R codePoint ifTrue:[ |
882 | 318 |
"/ |
319 |
"/ Ratio extension |
|
320 |
"/ |
|
321 |
'GIFREADER [info]: ratio extension ignored' infoPrintCR. |
|
322 |
blockSize := aStream nextByte. |
|
323 |
(blockSize == 2) ifTrue:[ |
|
324 |
aspNum := aStream nextByte. |
|
325 |
aspDen := aStream nextByte |
|
326 |
] ifFalse:[ |
|
327 |
aStream skip:blockSize |
|
328 |
]. |
|
329 |
"/ eat subblocks |
|
154 | 330 |
|
882 | 331 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
332 |
aStream skip:subBlockSize |
|
333 |
]. |
|
334 |
^ self |
|
239 | 335 |
]. |
336 |
||
337 |
type == 16r01 ifTrue:[ |
|
882 | 338 |
"/ |
339 |
"/ plaintext extension |
|
340 |
"/ |
|
625 | 341 |
"/ 'GIFREADER [info]: plaintext extension ignored' infoPrintCR. |
882 | 342 |
subBlockSize := aStream nextByte. |
343 |
left := aStream nextShortMSB:false. |
|
344 |
top := aStream nextShortMSB:false. |
|
345 |
width := aStream nextShortMSB:false. |
|
346 |
height := aStream nextShortMSB:false. |
|
347 |
cWidth := aStream nextByte. |
|
348 |
cHeight := aStream nextByte. |
|
349 |
fg := aStream nextByte. |
|
350 |
bg := aStream nextByte. |
|
351 |
aStream skip:12. |
|
352 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
|
353 |
aStream skip:subBlockSize |
|
354 |
]. |
|
355 |
^ self |
|
239 | 356 |
]. |
357 |
||
358 |
type == 16rF9 ifTrue:[ |
|
882 | 359 |
"/ |
360 |
"/ graphic control extension |
|
361 |
"/ |
|
888 | 362 |
"/ 'GIFREADER [info]: graphic control extension' infoPrintCR. |
670
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diff
changeset
|
363 |
|
2595
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be tolerant to corrupted gif files (subblock size in extension)
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|
364 |
[(subBlockSize := aStream nextByte) ~~ 0 and:[subBlockSize notNil]] whileTrue:[ |
882 | 365 |
"/ type bitAnd:1 means: animationMask is transparent pixel |
366 |
"/ to be implemented in Image ... |
|
305 | 367 |
|
882 | 368 |
animationType := aStream nextByte. |
369 |
animationTime := aStream nextShortMSB:false. |
|
370 |
animationMask := aStream nextByte. |
|
2595
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diff
changeset
|
371 |
|
882 | 372 |
subBlockSize := subBlockSize - 4. |
307
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diff
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|
373 |
|
882 | 374 |
(animationType bitTest: 1) ifTrue:[ |
375 |
maskPixel := animationMask. |
|
670
6a7f628ee66c
oops - mask was only set for interlaced images (stupid typo)
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parents:
647
diff
changeset
|
376 |
"/ 'GIFREADER [info]: mask: ' infoPrint. (maskPixel printStringRadix:16) infoPrintCR. |
882 | 377 |
]. |
670
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oops - mask was only set for interlaced images (stupid typo)
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parents:
647
diff
changeset
|
378 |
"/ 'GIFREADER [info]: animationTime: ' infoPrint. (animationTime * (1/100)) infoPrintCR. |
1429 | 379 |
"/ 'GIFREADER [info]: animationType: ' infoPrint. (animationType) infoPrintCR. |
380 |
"/ 'GIFREADER [info]: animationMask: ' infoPrint. (animationMask) infoPrintCR. |
|
307
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create a mask-image, if present
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diff
changeset
|
381 |
|
888 | 382 |
frameDelay := (animationTime * (1/100)) * 1000. |
383 |
||
882 | 384 |
subBlockSize ~~ 0 ifTrue:[ |
385 |
aStream skip:subBlockSize |
|
386 |
]. |
|
387 |
]. |
|
388 |
^ self |
|
239 | 389 |
]. |
390 |
||
519 | 391 |
type == 16rFE ifTrue:[ |
882 | 392 |
"/ |
393 |
"/ comment extension |
|
394 |
"/ |
|
625 | 395 |
"/ 'GIFREADER [info]: comment extension ignored' infoPrintCR. |
882 | 396 |
[(blockSize := aStream nextByte) ~~ 0] whileTrue:[ |
397 |
aStream skip:blockSize |
|
398 |
]. |
|
399 |
^ self |
|
519 | 400 |
]. |
401 |
||
239 | 402 |
type == 16rFF ifTrue:[ |
882 | 403 |
"/ |
404 |
"/ application extension |
|
405 |
"/ |
|
406 |
subBlockSize := aStream nextByte. |
|
407 |
appID := (aStream nextBytes:8 ) asString. |
|
408 |
appAUTH := aStream nextBytes:3. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
409 |
|
882 | 410 |
subBlockSize := aStream nextByte. |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
411 |
|
882 | 412 |
ok := false. |
413 |
appID = 'NETSCAPE' ifTrue:[ |
|
414 |
appAUTH asString = '2.0' ifTrue:[ |
|
415 |
subBlockSize == 3 ifTrue:[ |
|
416 |
b := aStream nextByte. |
|
417 |
iterationCount := aStream nextShortMSB:false. |
|
418 |
subBlockSize := aStream nextByte. |
|
419 |
ok := true. |
|
888 | 420 |
"/ ('GIFREADER [info]: NETSCAPE application extension - iterationCount = ') infoPrint. |
421 |
"/ iterationCount infoPrintCR. |
|
882 | 422 |
] |
423 |
] |
|
424 |
]. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
425 |
|
882 | 426 |
ok ifFalse:[ |
427 |
('GIFREADER [info]: application extension (' , appID , ') ignored') infoPrintCR. |
|
428 |
]. |
|
625 | 429 |
|
882 | 430 |
[subBlockSize > 0] whileTrue:[ |
431 |
aStream skip:subBlockSize. |
|
432 |
subBlockSize := aStream nextByte. |
|
433 |
]. |
|
434 |
^ self |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
435 |
]. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
436 |
|
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
437 |
type == 16r2C ifTrue:[ |
882 | 438 |
"/ |
439 |
"/ image descriptor extension |
|
440 |
"/ |
|
1429 | 441 |
"/ 'GIFREADER [info]: image descriptor extension ignored' infoPrintCR. |
882 | 442 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
443 |
aStream skip:subBlockSize |
|
444 |
]. |
|
445 |
^ self |
|
239 | 446 |
]. |
447 |
||
448 |
"/ |
|
449 |
"/ unknown extension |
|
450 |
"/ |
|
354
b4d2ce853c24
stefans suggested info/warning/error/fatal
Claus Gittinger <cg@exept.de>
parents:
339
diff
changeset
|
451 |
'GIFREADER [info]: unknown extension ignored' infoPrintCR. |
239 | 452 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
882 | 453 |
aStream skip:subBlockSize |
154 | 454 |
] |
455 |
||
888 | 456 |
"Modified: / 1.4.1998 / 15:01:18 / cg" |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
457 |
! |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
458 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
459 |
readImage:aStream |
882 | 460 |
"read a single image from aStream." |
461 |
||
1429 | 462 |
| 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
|
463 |
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
|
464 |
initialBuffSize| |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
465 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
466 |
"get image data" |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
467 |
leftOffs := aStream nextShortMSB:false. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
468 |
topOffs := aStream nextShortMSB:false. |
1429 | 469 |
"/ 'GIFReader: leftOffs ' infoPrint. leftOffs infoPrintCR. |
470 |
"/ 'GIFReader: topOffs ' infoPrint. topOffs infoPrintCR. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
471 |
width := aStream nextShortMSB:false. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
472 |
height := aStream nextShortMSB:false. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
473 |
|
1846 | 474 |
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
|
475 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
476 |
"/ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
477 |
"/ '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
|
478 |
"/ '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
|
479 |
"/ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
480 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
481 |
"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
|
482 |
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
|
483 |
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
|
484 |
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
|
485 |
"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
|
486 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
487 |
"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
|
488 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
489 |
hasLocalColorMap ifTrue:[ |
882 | 490 |
"local descr. overwrites" |
491 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
|
492 |
colorMapSize := 1 bitShift:bitsPerPixel. |
|
493 |
"overwrite colormap" |
|
1739 | 494 |
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
|
495 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
496 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
497 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
498 |
"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
|
499 |
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
|
500 |
(aStream respondsTo:#fileSize) ifTrue:[ |
882 | 501 |
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
|
502 |
] ifFalse:[ |
882 | 503 |
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
|
504 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
505 |
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
|
506 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
507 |
"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
|
508 |
index := 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
509 |
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
|
510 |
[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
|
511 |
(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
|
512 |
|t| |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
513 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
514 |
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
|
515 |
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
|
516 |
compressedData := t. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
517 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
518 |
|
882 | 519 |
aStream nextBytes:count into:compressedData startingAt:index blockSize:4096. |
520 |
index := index + count. |
|
521 |
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
|
522 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
523 |
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
|
524 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
525 |
h := height. |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
526 |
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
|
527 |
"/ '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
|
528 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
529 |
self class decompressGIFFrom:compressedData |
882 | 530 |
count:compressedSize |
531 |
into:data |
|
532 |
startingAt:1 |
|
533 |
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
|
534 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
535 |
interlaced ifTrue:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
536 |
"/ 'GIFREADER: deinterlacing ...' infoPrintCR. |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
537 |
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
|
538 |
|
882 | 539 |
"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
|
540 |
|
882 | 541 |
srcOffset := 1. |
542 |
0 to:(h - 1) by:8 do:[:dstRow | |
|
543 |
dstOffset := dstRow * width + 1. |
|
544 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
545 |
with:data startingAt:srcOffset. |
|
546 |
srcOffset := srcOffset + width. |
|
547 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
548 |
|
882 | 549 |
"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
|
550 |
|
882 | 551 |
4 to:(h - 1) by:8 do:[:dstRow | |
552 |
dstOffset := dstRow * width + 1. |
|
553 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
554 |
with:data startingAt:srcOffset. |
|
555 |
srcOffset := srcOffset + width. |
|
556 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
557 |
|
882 | 558 |
"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
|
559 |
|
882 | 560 |
2 to:(h - 1) by:4 do:[:dstRow | |
561 |
dstOffset := dstRow * width + 1. |
|
562 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
563 |
with:data startingAt:srcOffset. |
|
564 |
srcOffset := srcOffset + width. |
|
565 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
566 |
|
882 | 567 |
"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
|
568 |
|
882 | 569 |
1 to:(h - 1) by:2 do:[:dstRow | |
570 |
dstOffset := dstRow * width + 1. |
|
571 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
572 |
with:data startingAt:srcOffset. |
|
573 |
srcOffset := srcOffset + width. |
|
574 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
575 |
|
882 | 576 |
data := tmp. |
577 |
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
|
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 |
"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
|
581 |
"Modified: / 12.8.1998 / 13:55:32 / cg" |
0 | 582 |
! ! |
43 | 583 |
|
1805 | 584 |
!GIFReader methodsFor:'private-writing'! |
585 |
||
586 |
assignTransparentPixelIn:image |
|
587 |
"find an usused pixelValue in the colorMap (or image)." |
|
588 |
||
2056
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
589 |
|cmap usedPixelValues unusedValues| |
1805 | 590 |
|
591 |
(cmap := image colorMap) size > 0 ifTrue:[ |
|
2056
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
592 |
cmap size < 256 ifTrue:[ |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
593 |
maskPixel := cmap size. |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
594 |
^ self |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
595 |
] |
1805 | 596 |
]. |
597 |
||
598 |
usedPixelValues := image usedValues. |
|
2056
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
599 |
usedPixelValues size < (1 bitShift:image depth) ifFalse:[ |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
600 |
Image informationLostQuerySignal |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
601 |
raiseWith:image |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
602 |
errorString:('GIF writer cannot assign a transparent pixel - all pixelValues used by image'). |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
603 |
]. |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
604 |
|
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
605 |
"/ there must be an unused pixelValue |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
606 |
unusedValues := (0 to:(1 bitShift:image depth)-1) asSet. |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
607 |
unusedValues removeAll:usedPixelValues. |
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
608 |
|
b7eea50081f2
fixed transparency-pixel bug (with full colormap)
Claus Gittinger <cg@exept.de>
parents:
2032
diff
changeset
|
609 |
maskPixel := unusedValues first. |
1805 | 610 |
! |
611 |
||
612 |
checkCodeSize |
|
613 |
(freeCode > maxCode and: [codeSize < 12]) |
|
614 |
ifTrue: |
|
615 |
[codeSize := codeSize + 1. |
|
616 |
maxCode := (1 bitShift: codeSize) - 1] |
|
617 |
||
618 |
"Created: 14.10.1997 / 18:42:01 / cg" |
|
619 |
! |
|
620 |
||
621 |
flushBits |
|
622 |
remainBitCount = 0 |
|
623 |
ifFalse: |
|
624 |
[self nextBytePut: bufByte. |
|
625 |
remainBitCount := 0]. |
|
626 |
self flushBuffer |
|
627 |
||
628 |
"Modified: 14.10.1997 / 18:58:06 / cg" |
|
629 |
! |
|
630 |
||
631 |
flushBuffer |
|
632 |
bufStream isEmpty ifTrue: [^ self]. |
|
633 |
outStream nextPut: bufStream size. |
|
634 |
outStream nextPutAll: bufStream contents. |
|
635 |
bufStream := WriteStream on: (ByteArray new: 256) |
|
636 |
||
637 |
"Modified: 14.10.1997 / 20:46:04 / cg" |
|
638 |
! |
|
639 |
||
640 |
flushCode |
|
641 |
self flushBits |
|
642 |
||
643 |
"Created: 14.10.1997 / 18:57:33 / cg" |
|
644 |
! |
|
645 |
||
646 |
nextBitsPut: anInteger |
|
647 |
| integer writeBitCount shiftCount | |
|
648 |
shiftCount := 0. |
|
649 |
remainBitCount = 0 |
|
650 |
ifTrue: |
|
651 |
[writeBitCount := 8. |
|
652 |
integer := anInteger] |
|
653 |
ifFalse: |
|
654 |
[writeBitCount := remainBitCount. |
|
655 |
integer := bufByte + (anInteger bitShift: 8 - remainBitCount)]. |
|
656 |
[writeBitCount < codeSize] |
|
657 |
whileTrue: |
|
658 |
[self nextBytePut: ((integer bitShift: shiftCount) bitAnd: 255). |
|
659 |
shiftCount := shiftCount - 8. |
|
660 |
writeBitCount := writeBitCount + 8]. |
|
661 |
(remainBitCount := writeBitCount - codeSize) = 0 |
|
662 |
ifTrue: [self nextBytePut: (integer bitShift: shiftCount)] |
|
663 |
ifFalse: [bufByte := integer bitShift: shiftCount]. |
|
664 |
^anInteger |
|
665 |
||
666 |
"Modified: 15.10.1997 / 16:50:30 / cg" |
|
667 |
! |
|
668 |
||
669 |
nextBytePut: aByte |
|
670 |
bufStream nextPut: aByte. |
|
671 |
bufStream size >= 254 ifTrue: [self flushBuffer] |
|
672 |
||
673 |
"Modified: 15.10.1997 / 16:50:52 / cg" |
|
674 |
! |
|
675 |
||
676 |
readPixelFrom: bits |
|
677 |
| pixel | |
|
678 |
ypos >= height ifTrue: [^ nil]. |
|
679 |
(maskPixel notNil |
|
680 |
and:[(mask pixelAtX:xpos y:ypos) == 0]) ifTrue:[ |
|
681 |
pixel := maskPixel |
|
682 |
] ifFalse:[ |
|
683 |
pixel := bits at: ypos * rowByteSize + xpos + 1. |
|
684 |
]. |
|
685 |
self updatePixelPosition. |
|
686 |
^ pixel |
|
687 |
||
688 |
"Created: 14.10.1997 / 18:43:50 / cg" |
|
689 |
"Modified: 15.10.1997 / 16:46:43 / cg" |
|
690 |
! |
|
691 |
||
692 |
setParameters:bitsPerPixel |
|
693 |
clearCode := 1 bitShift:bitsPerPixel. |
|
694 |
eoiCode := clearCode + 1. |
|
695 |
freeCode := clearCode + 2. |
|
696 |
codeSize := bitsPerPixel + 1. |
|
697 |
maxCode := (1 bitShift: codeSize) - 1 |
|
698 |
||
699 |
"Modified: 14.10.1997 / 20:09:48 / cg" |
|
700 |
! |
|
701 |
||
702 |
updatePixelPosition |
|
703 |
(xpos := xpos + 1) >= width ifFalse: [^ self]. |
|
704 |
||
705 |
xpos := 0. |
|
706 |
interlace == true ifFalse:[ |
|
707 |
ypos := ypos + 1. |
|
708 |
^ self |
|
709 |
]. |
|
710 |
||
711 |
pass == 0 ifTrue:[ |
|
712 |
(ypos := ypos + 8) >= height ifTrue:[ |
|
713 |
pass := pass + 1. |
|
714 |
ypos := 4 |
|
715 |
]. |
|
716 |
^ self |
|
717 |
]. |
|
718 |
pass == 1 ifTrue:[ |
|
719 |
(ypos := ypos + 8) >= height ifTrue:[ |
|
720 |
pass := pass + 1. |
|
721 |
ypos := 2 |
|
722 |
]. |
|
723 |
^ self |
|
724 |
]. |
|
725 |
pass == 2 ifTrue:[ |
|
726 |
(ypos := ypos + 4) >= height ifTrue:[ |
|
727 |
pass := pass + 1. |
|
728 |
ypos := 1 |
|
729 |
]. |
|
730 |
^ self |
|
731 |
]. |
|
732 |
pass == 3 ifTrue:[ |
|
733 |
ypos := ypos + 2. |
|
734 |
^ self |
|
735 |
]. |
|
736 |
^ self error: 'can''t happen' |
|
737 |
||
738 |
"Modified: 14.10.1997 / 18:44:27 / cg" |
|
739 |
! |
|
740 |
||
2032 | 741 |
writeBitDataFor: image |
742 |
"using modified Lempel-Ziv Welch algorithm." |
|
743 |
||
744 |
| bits bitsPerPixel t1 |
|
745 |
maxBits maxMaxCode tSize initCodeSize ent tShift fCode pixel index disp nomatch | |
|
746 |
||
747 |
outStream nextPut:ImageSeparator. |
|
748 |
self writeShort:0. "/ |
|
749 |
self writeShort:0. "/ |
|
750 |
self writeShort:width. "/ image size |
|
751 |
self writeShort:height. |
|
752 |
||
753 |
interlace == true ifTrue:[ |
|
754 |
t1 := 64 |
|
755 |
] ifFalse:[ |
|
756 |
t1 := 0 |
|
757 |
]. |
|
758 |
outStream nextPut:t1. "/ another flag |
|
759 |
||
760 |
bitsPerPixel := image bitsPerPixel. |
|
761 |
bits := image bits. |
|
762 |
||
763 |
pass := 0. |
|
764 |
xpos := 0. |
|
765 |
ypos := 0. |
|
766 |
rowByteSize := image bytesPerRow. "/ width * 8 + 31 // 32 * 4. |
|
767 |
remainBitCount := 0. |
|
768 |
bufByte := 0. |
|
769 |
bufStream := WriteStream on: (ByteArray new: 256). |
|
770 |
||
771 |
maxBits := 12. |
|
772 |
maxMaxCode := 1 bitShift: maxBits. |
|
773 |
tSize := 5003. |
|
774 |
prefixTable := Array new: tSize. |
|
775 |
suffixTable := Array new: tSize. |
|
776 |
||
777 |
initCodeSize := bitsPerPixel <= 1 ifTrue: [2] ifFalse: [bitsPerPixel]. |
|
778 |
outStream nextPut: initCodeSize. |
|
779 |
self setParameters: initCodeSize. |
|
780 |
||
781 |
tShift := 0. |
|
782 |
fCode := tSize. |
|
783 |
[fCode < 65536] whileTrue: |
|
784 |
[tShift := tShift + 1. |
|
785 |
fCode := fCode * 2]. |
|
786 |
tShift := 8 - tShift. |
|
787 |
1 to: tSize do: [:i | suffixTable at: i put: -1]. |
|
788 |
||
789 |
self writeCodeAndCheckCodeSize: clearCode. |
|
790 |
ent := self readPixelFrom: bits. |
|
791 |
[(pixel := self readPixelFrom: bits) == nil] whileFalse: |
|
792 |
[ |
|
793 |
fCode := (pixel bitShift: maxBits) + ent. |
|
794 |
index := ((pixel bitShift: tShift) bitXor: ent) + 1. |
|
795 |
(suffixTable at: index) = fCode |
|
796 |
ifTrue: [ent := prefixTable at: index] |
|
797 |
ifFalse: |
|
798 |
[nomatch := true. |
|
799 |
(suffixTable at: index) >= 0 |
|
800 |
ifTrue: |
|
801 |
[disp := tSize - index + 1. |
|
802 |
index = 1 ifTrue: [disp := 1]. |
|
803 |
"probe" |
|
804 |
[(index := index - disp) < 1 ifTrue: [index := index + tSize]. |
|
805 |
(suffixTable at: index) = fCode |
|
806 |
ifTrue: |
|
807 |
[ent := prefixTable at: index. |
|
808 |
nomatch := false. |
|
809 |
"continue whileFalse:"]. |
|
810 |
nomatch and: [(suffixTable at: index) > 0]] |
|
811 |
whileTrue: ["probe"]]. |
|
812 |
"nomatch" |
|
813 |
nomatch ifTrue: |
|
814 |
[self writeCodeAndCheckCodeSize: ent. |
|
815 |
ent := pixel. |
|
816 |
freeCode < maxMaxCode |
|
817 |
ifTrue: |
|
818 |
[prefixTable at: index put: freeCode. |
|
819 |
suffixTable at: index put: fCode. |
|
820 |
freeCode := freeCode + 1] |
|
821 |
ifFalse: |
|
822 |
[self writeCodeAndCheckCodeSize: clearCode. |
|
823 |
1 to: tSize do: [:i | suffixTable at: i put: -1]. |
|
824 |
self setParameters: initCodeSize]]]]. |
|
825 |
prefixTable := suffixTable := nil. |
|
826 |
self writeCodeAndCheckCodeSize: ent. |
|
827 |
self writeCodeAndCheckCodeSize: eoiCode. |
|
828 |
self flushCode. |
|
829 |
outStream nextPut: 0. "zero-length packet" |
|
830 |
||
831 |
"Modified: 15.10.1997 / 19:56:28 / cg" |
|
832 |
! |
|
833 |
||
1805 | 834 |
writeCode: aCode |
835 |
self nextBitsPut: aCode |
|
836 |
||
837 |
"Created: 14.10.1997 / 18:38:35 / cg" |
|
838 |
"Modified: 15.10.1997 / 17:01:47 / cg" |
|
839 |
! |
|
840 |
||
841 |
writeCodeAndCheckCodeSize: t1 |
|
842 |
self writeCode: t1. |
|
843 |
self checkCodeSize |
|
844 |
||
845 |
"Created: 14.10.1997 / 18:38:24 / cg" |
|
846 |
"Modified: 14.10.1997 / 18:40:56 / cg" |
|
2032 | 847 |
! |
848 |
||
849 |
writeHeaderFor:image |
|
850 |
"write the gif header" |
|
851 |
||
852 |
|bitsPerPixel t1| |
|
853 |
||
854 |
bitsPerPixel := image bitsPerPixel. |
|
855 |
||
856 |
outStream nextPutAll: 'GIF89a' asByteArray. |
|
857 |
self writeShort:width. "/ screen size |
|
858 |
self writeShort:height. |
|
859 |
t1 := 128. |
|
860 |
t1 := t1 bitOr:(bitsPerPixel - 1 bitShift:5). |
|
861 |
t1 := t1 bitOr:(bitsPerPixel - 1). |
|
862 |
outStream nextPut:t1. "/ flag |
|
863 |
outStream nextPut:0. "/ background (not used) |
|
864 |
outStream nextPut:0. "/ aspect ratio |
|
865 |
||
866 |
0 to:(1 bitShift:bitsPerPixel)-1 do:[:pixel | |
|
867 |
|clr red green blue| |
|
868 |
||
869 |
clr := image colorFromValue:pixel. |
|
870 |
clr isNil ifTrue:[ |
|
871 |
"/ unused colorMap slot |
|
872 |
red := green := blue := 0. |
|
873 |
] ifFalse:[ |
|
874 |
red := (clr redByte). |
|
875 |
green := (clr greenByte). |
|
876 |
blue := (clr blueByte). |
|
877 |
]. |
|
878 |
outStream |
|
879 |
nextPut:red; nextPut:green; nextPut:blue. |
|
880 |
]. |
|
881 |
||
882 |
"Created: / 14.10.1997 / 17:41:28 / cg" |
|
883 |
"Modified: / 31.10.1997 / 16:12:13 / cg" |
|
884 |
! |
|
885 |
||
886 |
writeMaskExtensionHeaderFor:image |
|
887 |
"write an extension header for the transparent pixel" |
|
888 |
||
889 |
outStream nextPut:Extension. |
|
890 |
outStream nextPut:16rF9. "/ graphic control extension |
|
891 |
outStream nextPut:4. "/ subBlockSize |
|
892 |
||
893 |
outStream nextPut:1. "/ animationType |
|
894 |
outStream nextPutShort:1 MSB:false. "/ animationTime |
|
895 |
outStream nextPut:maskPixel. "/ animationMask |
|
896 |
||
897 |
outStream nextPut:0. |
|
1805 | 898 |
! ! |
899 |
||
708 | 900 |
!GIFReader methodsFor:'writing to file'! |
901 |
||
902 |
save:image onFile:aFileName |
|
903 |
"save image as GIF file on aFileName" |
|
904 |
||
1813
aa74c7bd22ad
image saving - use save:onStream:
Claus Gittinger <cg@exept.de>
parents:
1811
diff
changeset
|
905 |
|convertedImage| |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
906 |
|
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
907 |
image depth ~~ 8 ifTrue:[ |
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
908 |
Image errorSignal handle:[:ex | |
1811 | 909 |
^ Image cannotRepresentImageSignal |
910 |
raiseWith:image |
|
911 |
errorString:('GIF failed to convert image to depth8: ', ex description). |
|
912 |
"/ ex return. |
|
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
913 |
] do:[ |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
914 |
convertedImage := Image newForDepth:8. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
915 |
convertedImage fromImage:image photometric:#palette. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
916 |
]. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
917 |
convertedImage notNil ifTrue:[ |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
918 |
^ self save:convertedImage onFile:aFileName |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
919 |
]. |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
920 |
^ Image cannotRepresentImageSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
921 |
raiseWith:image |
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
922 |
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
|
923 |
]. |
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
924 |
|
1813
aa74c7bd22ad
image saving - use save:onStream:
Claus Gittinger <cg@exept.de>
parents:
1811
diff
changeset
|
925 |
super save:image onFile:aFileName. |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
926 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
927 |
" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
928 |
|i| |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
929 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
930 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
931 |
GIFReader save:i onFile:'foo.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
932 |
(Image fromFile:'./foo.gif') inspect |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
933 |
" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
934 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
935 |
"Created: / 14.10.1997 / 17:40:12 / cg" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
936 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
937 |
! |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
938 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
939 |
save:image onStream:aStream |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
940 |
"save image in GIF-file-format onto aStream" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
941 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
942 |
image depth ~~ 8 ifTrue:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
943 |
^ Image cannotRepresentImageSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
944 |
raiseWith:image |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
945 |
errorString:('GIF (currently) only supports depth8 images'). |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
946 |
]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
947 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
948 |
outStream := aStream. |
708 | 949 |
outStream binary. |
950 |
||
714 | 951 |
mask := image mask. |
952 |
mask notNil ifTrue:[ |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
953 |
self assignTransparentPixelIn:image |
708 | 954 |
]. |
955 |
||
956 |
byteOrder := #lsb. |
|
957 |
width := image width. |
|
958 |
height := image height. |
|
959 |
photometric := image photometric. |
|
960 |
samplesPerPixel := image samplesPerPixel. |
|
961 |
bitsPerSample := image bitsPerSample. |
|
962 |
colorMap := image colorMap. |
|
963 |
data := image bits. |
|
964 |
||
965 |
self writeHeaderFor:image. |
|
714 | 966 |
maskPixel notNil ifTrue:[ |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
967 |
self writeMaskExtensionHeaderFor:image. |
714 | 968 |
]. |
969 |
||
708 | 970 |
self writeBitDataFor:image. |
714 | 971 |
|
972 |
outStream nextPut: Terminator. |
|
708 | 973 |
|
974 |
" |
|
975 |
|i| |
|
976 |
||
977 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
|
978 |
GIFReader save:i onFile:'foo.gif'. |
|
979 |
(Image fromFile:'./foo.gif') inspect |
|
980 |
" |
|
981 |
||
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
982 |
"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
|
983 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
708 | 984 |
! ! |
985 |
||
339 | 986 |
!GIFReader class methodsFor:'documentation'! |
135 | 987 |
|
988 |
version |
|
2694 | 989 |
^ '$Header: /cvs/stx/stx/libview2/GIFReader.st,v 1.96 2009-07-31 08:49:05 cg Exp $' |
135 | 990 |
! ! |
1711
b3ba13167ee7
Handle openErrorSignal in preparition for change openErrorSignal
Stefan Vogel <sv@exept.de>
parents:
1521
diff
changeset
|
991 |
|
43 | 992 |
GIFReader initialize! |