author | martin |
Tue, 07 Nov 2000 15:19:03 +0100 | |
changeset 1417 | 810fdd94d742 |
parent 1393 | abed635fb3ce |
child 1429 | 28c9e0f9d239 |
permissions | -rw-r--r-- |
0 | 1 |
" |
6 | 2 |
COPYRIGHT (c) 1991 by Claus Gittinger |
26 | 3 |
All Rights Reserved |
0 | 4 |
|
5 |
This software is furnished under a license and may be used |
|
6 |
only in accordance with the terms of that license and with the |
|
7 |
inclusion of the above copyright notice. This software may not |
|
8 |
be provided or otherwise made available to, or used by, any |
|
9 |
other person. No title to or ownership of the software is |
|
10 |
hereby transferred. |
|
11 |
" |
|
12 |
||
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
13 |
"{ Package: 'stx:libview2' }" |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
14 |
|
0 | 15 |
ImageReader subclass:#GIFReader |
708 | 16 |
instanceVariableNames:'redMap greenMap blueMap pass xpos ypos rowByteSize remainBitCount |
17 |
bufByte bufStream prefixTable suffixTable clearCode eoiCode |
|
888 | 18 |
freeCode codeSize maxCode interlace frameDelay iterationCount' |
708 | 19 |
classVariableNames:'ImageSeparator Extension Terminator' |
154 | 20 |
poolDictionaries:'' |
259 | 21 |
category:'Graphics-Images-Support' |
0 | 22 |
! |
23 |
||
339 | 24 |
!GIFReader class methodsFor:'documentation'! |
0 | 25 |
|
21 | 26 |
copyright |
27 |
" |
|
28 |
COPYRIGHT (c) 1991 by Claus Gittinger |
|
26 | 29 |
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. |
|
37 |
" |
|
38 |
! |
|
39 |
||
0 | 40 |
documentation |
41 |
" |
|
42 |
this class provides methods for loading and saving GIF pictures. |
|
21 | 43 |
It has been tested with some different GIF87a pictures, I dont |
0 | 44 |
know, if it works with other GIF versions. |
45 |
GIF extension blocks are not handled. |
|
46 |
||
47 |
GIF file writing is not implemented (use TIFF). |
|
48 |
||
21 | 49 |
legal stuff extracted from GIF87a documentation: |
0 | 50 |
|
51 |
CompuServe Incorporated hereby grants a limited, non-exclusive, royalty-free |
|
52 |
license for the use of the Graphics Interchange Format(sm) in computer |
|
53 |
software; computer software utilizing GIF(sm) must acknowledge ownership of the |
|
54 |
Graphics Interchange Format and its Service Mark by CompuServe Incorporated, in |
|
55 |
User and Technical Documentation. |
|
56 |
||
57 |
The Graphics Interchange Format(c) is the Copyright property of |
|
58 |
CompuServe Incorporated. GIF(sm) is a Service Mark property of |
|
59 |
CompuServe Incorporated. |
|
194 | 60 |
|
61 |
[See also:] |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
62 |
Image Form Icon |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
63 |
BlitImageReader FaceReader JPEGReader PBMReader PCXReader |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
64 |
ST80FormReader SunRasterReader TargaReader TIFFReader WindowsIconReader |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
65 |
XBMReader XPMReader XWDReader |
220 | 66 |
|
67 |
[author:] |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
68 |
Claus Gittinger |
0 | 69 |
" |
70 |
! ! |
|
71 |
||
339 | 72 |
!GIFReader class methodsFor:'initialization'! |
26 | 73 |
|
74 |
initialize |
|
198 | 75 |
"install myself in the Image classes fileFormat table |
398 | 76 |
for the `.gif' extensions." |
198 | 77 |
|
708 | 78 |
ImageSeparator := $, asciiValue. |
79 |
Extension := $!! asciiValue. |
|
80 |
Terminator := $; asciiValue. |
|
81 |
||
647 | 82 |
MIMETypes defineImageType:'image/gif' suffix:'gif' reader:self. |
198 | 83 |
|
708 | 84 |
"Modified: 14.10.1997 / 18:47:27 / cg" |
26 | 85 |
! ! |
86 |
||
339 | 87 |
!GIFReader class methodsFor:'testing'! |
1 | 88 |
|
713 | 89 |
canRepresent:anImage |
90 |
"return true, if anImage can be represented in my file format. |
|
91 |
GIF supports depth 8 images only." |
|
92 |
||
93 |
^ anImage depth == 8 |
|
94 |
||
95 |
"Created: 17.10.1997 / 20:19:20 / cg" |
|
96 |
! |
|
97 |
||
1 | 98 |
isValidImageFile:aFileName |
99 |
"return true, if aFileName contains a GIF image" |
|
100 |
||
101 |
|id inStream| |
|
102 |
||
9 | 103 |
inStream := self streamReadingFile:aFileName. |
1 | 104 |
inStream isNil ifTrue:[^ false]. |
105 |
||
332 | 106 |
inStream text. |
107 |
||
1 | 108 |
id := String new:6. |
109 |
inStream nextBytes:6 into:id. |
|
110 |
inStream close. |
|
111 |
||
112 |
(id = 'GIF87a') ifFalse:[ |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
113 |
(id startsWith:'GIF') ifFalse:[^ false]. |
1 | 114 |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
115 |
id ~= 'GIF89a' ifTrue:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
116 |
'GIFReader [info]: not a GIF87a/GIF89a file - hope that works' infoPrintCR. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
117 |
] |
1 | 118 |
]. |
119 |
^ true |
|
174 | 120 |
|
355 | 121 |
"Modified: 10.1.1997 / 15:40:34 / cg" |
1 | 122 |
! ! |
123 |
||
708 | 124 |
!GIFReader methodsFor:'private - writing'! |
125 |
||
714 | 126 |
assignTransparentPixelIn:image |
127 |
"find an usused pixelValue in the colorMap (or image)." |
|
128 |
||
129 |
|cmap usedPixelValues| |
|
130 |
||
131 |
(cmap := image colorMap) size > 0 ifTrue:[ |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
132 |
cmap size < 256 ifTrue:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
133 |
maskPixel := cmap size. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
134 |
^ self |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
135 |
] |
714 | 136 |
]. |
137 |
||
138 |
usedPixelValues := image usedValues. |
|
139 |
usedPixelValues size < (1 bitShift:image depth) ifTrue:[ |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
140 |
"/ there must be an unused pixelValue |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
141 |
maskPixel := ((0 to:(1 bitShift:image depth)-1) asSet removeAll:(usedPixelValues)) first. |
714 | 142 |
] ifFalse:[ |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
143 |
Image informationLostQuerySignal |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
144 |
raiseWith:image |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
145 |
errorString:('GIF writer cannot assign a transparent pixel - all pixelValues used by image'). |
714 | 146 |
] |
147 |
! |
|
148 |
||
708 | 149 |
checkCodeSize |
150 |
(freeCode > maxCode and: [codeSize < 12]) |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
151 |
ifTrue: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
152 |
[codeSize := codeSize + 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
153 |
maxCode := (1 bitShift: codeSize) - 1] |
708 | 154 |
|
155 |
"Created: 14.10.1997 / 18:42:01 / cg" |
|
156 |
! |
|
157 |
||
158 |
flushBits |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
159 |
remainBitCount = 0 |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
160 |
ifFalse: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
161 |
[self nextBytePut: bufByte. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
162 |
remainBitCount := 0]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
163 |
self flushBuffer |
708 | 164 |
|
165 |
"Modified: 14.10.1997 / 18:58:06 / cg" |
|
166 |
! |
|
167 |
||
168 |
flushBuffer |
|
169 |
bufStream isEmpty ifTrue: [^ self]. |
|
170 |
outStream nextPut: bufStream size. |
|
171 |
outStream nextPutAll: bufStream contents. |
|
172 |
bufStream := WriteStream on: (ByteArray new: 256) |
|
173 |
||
174 |
"Modified: 14.10.1997 / 20:46:04 / cg" |
|
175 |
! |
|
176 |
||
177 |
flushCode |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
178 |
self flushBits |
708 | 179 |
|
180 |
"Created: 14.10.1997 / 18:57:33 / cg" |
|
181 |
! |
|
182 |
||
710 | 183 |
nextBitsPut: anInteger |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
184 |
| integer writeBitCount shiftCount | |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
185 |
shiftCount _ 0. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
186 |
remainBitCount = 0 |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
187 |
ifTrue: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
188 |
[writeBitCount _ 8. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
189 |
integer _ anInteger] |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
190 |
ifFalse: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
191 |
[writeBitCount _ remainBitCount. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
192 |
integer _ bufByte + (anInteger bitShift: 8 - remainBitCount)]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
193 |
[writeBitCount < codeSize] |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
194 |
whileTrue: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
195 |
[self nextBytePut: ((integer bitShift: shiftCount) bitAnd: 255). |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
196 |
shiftCount _ shiftCount - 8. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
197 |
writeBitCount _ writeBitCount + 8]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
198 |
(remainBitCount _ writeBitCount - codeSize) = 0 |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
199 |
ifTrue: [self nextBytePut: (integer bitShift: shiftCount)] |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
200 |
ifFalse: [bufByte _ integer bitShift: shiftCount]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
201 |
^anInteger |
708 | 202 |
|
710 | 203 |
"Modified: 15.10.1997 / 16:50:30 / cg" |
708 | 204 |
! |
205 |
||
710 | 206 |
nextBytePut: aByte |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
207 |
bufStream nextPut: aByte. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
208 |
bufStream size >= 254 ifTrue: [self flushBuffer] |
708 | 209 |
|
710 | 210 |
"Modified: 15.10.1997 / 16:50:52 / cg" |
708 | 211 |
! |
212 |
||
710 | 213 |
readPixelFrom: bits |
214 |
| pixel | |
|
708 | 215 |
ypos >= height ifTrue: [^ nil]. |
714 | 216 |
(maskPixel notNil |
217 |
and:[(mask pixelAtX:xpos y:ypos) == 0]) ifTrue:[ |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
218 |
pixel := maskPixel |
714 | 219 |
] ifFalse:[ |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
220 |
pixel := bits at: ypos * rowByteSize + xpos + 1. |
714 | 221 |
]. |
708 | 222 |
self updatePixelPosition. |
710 | 223 |
^ pixel |
708 | 224 |
|
225 |
"Created: 14.10.1997 / 18:43:50 / cg" |
|
710 | 226 |
"Modified: 15.10.1997 / 16:46:43 / cg" |
708 | 227 |
! |
228 |
||
229 |
setParameters:bitsPerPixel |
|
230 |
clearCode := 1 bitShift:bitsPerPixel. |
|
231 |
eoiCode := clearCode + 1. |
|
232 |
freeCode := clearCode + 2. |
|
233 |
codeSize := bitsPerPixel + 1. |
|
234 |
maxCode := (1 bitShift: codeSize) - 1 |
|
235 |
||
236 |
"Modified: 14.10.1997 / 20:09:48 / cg" |
|
237 |
! |
|
238 |
||
239 |
updatePixelPosition |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
240 |
(xpos _ xpos + 1) >= width ifFalse: [^ self]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
241 |
xpos _ 0. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
242 |
interlace == true |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
243 |
ifFalse: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
244 |
[ypos _ ypos + 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
245 |
^ self]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
246 |
pass = 0 |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
247 |
ifTrue: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
248 |
[(ypos _ ypos + 8) >= height |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
249 |
ifTrue: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
250 |
[pass _ pass + 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
251 |
ypos _ 4]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
252 |
^ self]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
253 |
pass = 1 |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
254 |
ifTrue: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
255 |
[(ypos _ ypos + 8) >= height |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
256 |
ifTrue: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
257 |
[pass _ pass + 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
258 |
ypos _ 2]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
259 |
^ self]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
260 |
pass = 2 |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
261 |
ifTrue: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
262 |
[(ypos _ ypos + 4) >= height |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
263 |
ifTrue: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
264 |
[pass _ pass + 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
265 |
ypos _ 1]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
266 |
^ self]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
267 |
pass = 3 |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
268 |
ifTrue: |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
269 |
[ypos _ ypos + 2. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
270 |
^ self]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
271 |
^ self error: 'can''t happen' |
708 | 272 |
|
273 |
"Modified: 14.10.1997 / 18:44:27 / cg" |
|
274 |
! |
|
275 |
||
710 | 276 |
writeCode: aCode |
277 |
self nextBitsPut: aCode |
|
708 | 278 |
|
279 |
"Created: 14.10.1997 / 18:38:35 / cg" |
|
710 | 280 |
"Modified: 15.10.1997 / 17:01:47 / cg" |
708 | 281 |
! |
282 |
||
283 |
writeCodeAndCheckCodeSize: t1 |
|
284 |
self writeCode: t1. |
|
285 |
self checkCodeSize |
|
286 |
||
287 |
"Created: 14.10.1997 / 18:38:24 / cg" |
|
288 |
"Modified: 14.10.1997 / 18:40:56 / cg" |
|
289 |
! ! |
|
290 |
||
0 | 291 |
!GIFReader methodsFor:'reading from file'! |
292 |
||
1 | 293 |
checkGreyscaleColormap |
239 | 294 |
"return true, if colormap is actually a greymap. |
295 |
Could be used to convert it into a greyScale image - which is not yet done." |
|
1 | 296 |
|
20 | 297 |
|sz "{ Class: SmallInteger }" |
298 |
redVal| |
|
299 |
||
300 |
sz := redMap size. |
|
301 |
||
302 |
1 to:sz do:[:i | |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
303 |
redVal := redMap at:i. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
304 |
redVal ~~ (greenMap at:i) ifTrue:[^ false]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
305 |
redVal ~~ (blueMap at:i) ifTrue:[^ false]. |
1 | 306 |
]. |
307 |
^ true |
|
239 | 308 |
|
309 |
"Modified: 2.5.1996 / 17:54:40 / cg" |
|
1 | 310 |
! |
311 |
||
43 | 312 |
fromStream:aStream |
882 | 313 |
"read a stream containing a GIF image (or an image sequence). |
192 | 314 |
Leave image description in instance variables." |
43 | 315 |
|
708 | 316 |
|byte index flag count fileColorMap |
43 | 317 |
colorMapSize bitsPerPixel scrWidth scrHeight |
318 |
hasColorMap hasLocalColorMap interlaced id |
|
319 |
leftOffs topOffs codeLen |
|
320 |
compressedData compressedSize |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
321 |
tmp srcOffset dstOffset isGif89 atEnd |
888 | 322 |
h "{ Class: SmallInteger }" |
891 | 323 |
img firstImage firstFrameDelay frame imageCount| |
43 | 324 |
|
325 |
inStream := aStream. |
|
326 |
aStream binary. |
|
327 |
||
328 |
"GIF-files are always lsb (intel-world)" |
|
329 |
byteOrder := #lsb. |
|
330 |
||
331
304f9c439efa
allow reading from ByteArray-readStreams
Claus Gittinger <cg@exept.de>
parents:
315
diff
changeset
|
331 |
id := ByteArray new:6. |
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
332 |
(aStream nextBytes:6 into:id startingAt:1) ~~ 6 ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
333 |
^ self fileFormatError:'not a gif file (short read)'. |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
334 |
]. |
331
304f9c439efa
allow reading from ByteArray-readStreams
Claus Gittinger <cg@exept.de>
parents:
315
diff
changeset
|
335 |
id := id asString. |
43 | 336 |
|
337 |
"all I had for testing where GIF87a files; |
|
338 |
I hope later versions work too ..." |
|
339 |
||
154 | 340 |
isGif89 := false. |
43 | 341 |
(id ~= 'GIF87a') ifTrue:[ |
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
342 |
(id startsWith:'GIF') ifFalse:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
343 |
^ self fileFormatError:('not a gif file (id=''' , id , ''')'). |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
344 |
]. |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
345 |
id ~= 'GIF89a' ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
346 |
'GIFReader [info]: not a GIF87a/GIF89a file - hope that works' infoPrintCR. |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
347 |
] |
43 | 348 |
]. |
349 |
||
350 |
"get screen dimensions (not used)" |
|
351 |
scrWidth := aStream nextShortMSB:false. |
|
352 |
scrHeight := aStream nextShortMSB:false. |
|
353 |
||
354 |
"get flag byte" |
|
355 |
flag := aStream nextByte. |
|
356 |
hasColorMap := (flag bitAnd:2r10000000) ~~ 0. |
|
357 |
"bitsPerRGB := ((flag bitAnd:2r01110000) bitShift:-4) + 1. " |
|
358 |
"colorMapSorted := ((flag bitAnd:2r00001000) ~~ 0. " |
|
359 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
|
360 |
colorMapSize := 1 bitShift:bitsPerPixel. |
|
361 |
||
362 |
"get background (not used)" |
|
363 |
aStream nextByte. |
|
364 |
||
365 |
"aspect ratio (not used)" |
|
366 |
aStream nextByte. |
|
367 |
||
368 |
"get colorMap" |
|
369 |
hasColorMap ifTrue:[ |
|
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
370 |
self readColorMap:colorMapSize. |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
371 |
fileColorMap := Colormap |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
372 |
redVector:redMap |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
373 |
greenVector:greenMap |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
374 |
blueVector:blueMap. |
43 | 375 |
]. |
708 | 376 |
colorMap := fileColorMap. |
43 | 377 |
|
378 |
photometric := #palette. |
|
379 |
samplesPerPixel := 1. |
|
380 |
bitsPerSample := #(8). |
|
381 |
||
888 | 382 |
imageCount := 0. |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
383 |
atEnd := false. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
384 |
[atEnd] whileFalse:[ |
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
385 |
"gif89a extensions" |
43 | 386 |
|
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
387 |
byte := aStream nextByte. |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
388 |
byte == Extension ifTrue:[ |
888 | 389 |
"/ 'Ext' infoPrintCR. |
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
390 |
self readExtension:aStream. |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
391 |
] ifFalse:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
392 |
(byte == Terminator) ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
393 |
atEnd := true |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
394 |
] ifFalse:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
395 |
"must be image separator" |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
396 |
(byte ~~ ImageSeparator) ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
397 |
^ self fileFormatError:('corrupted gif file (no IMAGESEP): ' , (byte printStringRadix:16)). |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
398 |
]. |
888 | 399 |
"/ 'Img' infoPrintCR. |
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
400 |
|
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
401 |
fileColorMap notNil ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
402 |
colorMap := fileColorMap. |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
403 |
]. |
1052
0a0a36bfaf21
handle primitiveFailure in decompression (corrupted file)
Claus Gittinger <cg@exept.de>
parents:
1037
diff
changeset
|
404 |
Object primitiveFailureSignal handle:[:ex | |
0a0a36bfaf21
handle primitiveFailure in decompression (corrupted file)
Claus Gittinger <cg@exept.de>
parents:
1037
diff
changeset
|
405 |
^ self fileFormatError:('corrupted gif file'). |
0a0a36bfaf21
handle primitiveFailure in decompression (corrupted file)
Claus Gittinger <cg@exept.de>
parents:
1037
diff
changeset
|
406 |
] do:[ |
0a0a36bfaf21
handle primitiveFailure in decompression (corrupted file)
Claus Gittinger <cg@exept.de>
parents:
1037
diff
changeset
|
407 |
self readImage:aStream. |
0a0a36bfaf21
handle primitiveFailure in decompression (corrupted file)
Claus Gittinger <cg@exept.de>
parents:
1037
diff
changeset
|
408 |
]. |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
409 |
|
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
410 |
maskPixel notNil ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
411 |
"/ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
412 |
"/ ok, there is a maskValue |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
413 |
"/ build a Depth1Image for it. |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
414 |
"/ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
415 |
self buildMaskFromColor:maskPixel |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
416 |
]. |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
417 |
|
888 | 418 |
imageCount == 0 ifTrue:[ |
419 |
img := self makeImage. |
|
891 | 420 |
"/ remember first image in case more come later. |
421 |
firstImage := img. |
|
422 |
firstFrameDelay := frameDelay. |
|
888 | 423 |
] ifFalse:[ |
424 |
imageCount == 1 ifTrue:[ |
|
425 |
imageSequence := ImageSequence new. |
|
426 |
img imageSequence:imageSequence. |
|
891 | 427 |
|
428 |
"/ add frame for first image. |
|
429 |
frame := ImageFrame new image:firstImage. |
|
430 |
frame delay:firstFrameDelay. |
|
888 | 431 |
imageSequence add:frame. |
432 |
]. |
|
433 |
img := self makeImage. |
|
434 |
img imageSequence:imageSequence. |
|
891 | 435 |
|
436 |
"/ add frame for this image. |
|
888 | 437 |
frame := ImageFrame new image:img. |
438 |
frame delay:frameDelay. |
|
439 |
imageSequence add:frame. |
|
440 |
]. |
|
441 |
||
442 |
imageCount := imageCount + 1. |
|
443 |
||
444 |
frameDelay := nil. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
445 |
|
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
446 |
aStream atEnd ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
447 |
atEnd := true. |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
448 |
] |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
449 |
] |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
450 |
]. |
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
451 |
]. |
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
452 |
|
890 | 453 |
imageSequence notNil ifTrue:[ |
454 |
iterationCount notNil ifTrue:[ |
|
455 |
iterationCount == 0 ifTrue:[ |
|
456 |
imageSequence loop:true. |
|
457 |
] ifFalse:[ |
|
458 |
imageSequence loop:false. |
|
459 |
imageSequence iterationCount:iterationCount. |
|
460 |
] |
|
461 |
] |
|
462 |
]. |
|
463 |
||
888 | 464 |
" |
465 |
Image fromFile:'/home/cg/work/stx/goodies/bitmaps/gifImages/animated/vrml.gif' |
|
466 |
Image fromFile:'/home/cg/work/stx/goodies/bitmaps/gifImages/animated/arrow.gif' |
|
467 |
" |
|
468 |
||
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
469 |
"Modified: / 5.7.1996 / 17:32:01 / stefan" |
1052
0a0a36bfaf21
handle primitiveFailure in decompression (corrupted file)
Claus Gittinger <cg@exept.de>
parents:
1037
diff
changeset
|
470 |
"Modified: / 21.8.1998 / 22:20:00 / cg" |
135 | 471 |
! |
472 |
||
473 |
makeGreyscale |
|
474 |
"not yet implemented/needed" |
|
475 |
! |
|
476 |
||
477 |
readColorMap:colorMapSize |
|
478 |
"get gif colormap consisting of colorMapSize entries" |
|
479 |
||
480 |
|sz "{ Class: SmallInteger }"| |
|
481 |
||
482 |
redMap := ByteArray uninitializedNew:colorMapSize. |
|
483 |
greenMap := ByteArray uninitializedNew:colorMapSize. |
|
484 |
blueMap := ByteArray uninitializedNew:colorMapSize. |
|
239 | 485 |
|
135 | 486 |
sz := colorMapSize. |
487 |
1 to:sz do:[:i | |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
488 |
redMap at:i put:(inStream nextByte). |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
489 |
greenMap at:i put:(inStream nextByte). |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
490 |
blueMap at:i put:(inStream nextByte) |
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
491 |
]. |
239 | 492 |
|
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
493 |
"Modified: 21.6.1996 / 12:32:43 / cg" |
154 | 494 |
! |
495 |
||
496 |
readExtension:aStream |
|
882 | 497 |
"get gif89 extension" |
154 | 498 |
|
499 |
|type blockSize subBlockSize |
|
304 | 500 |
aspNum aspDen left top width height cWidth cHeight fg bg |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
501 |
animationType animationTime animationMask |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
502 |
appID appAUTH |
888 | 503 |
b ok| |
154 | 504 |
|
505 |
type := aStream nextByte. |
|
506 |
type == $R asciiValue ifTrue:[ |
|
882 | 507 |
"/ |
508 |
"/ Ratio extension |
|
509 |
"/ |
|
510 |
'GIFREADER [info]: ratio extension ignored' infoPrintCR. |
|
511 |
blockSize := aStream nextByte. |
|
512 |
(blockSize == 2) ifTrue:[ |
|
513 |
aspNum := aStream nextByte. |
|
514 |
aspDen := aStream nextByte |
|
515 |
] ifFalse:[ |
|
516 |
aStream skip:blockSize |
|
517 |
]. |
|
518 |
"/ eat subblocks |
|
154 | 519 |
|
882 | 520 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
521 |
aStream skip:subBlockSize |
|
522 |
]. |
|
523 |
^ self |
|
239 | 524 |
]. |
525 |
||
526 |
type == 16r01 ifTrue:[ |
|
882 | 527 |
"/ |
528 |
"/ plaintext extension |
|
529 |
"/ |
|
625 | 530 |
"/ 'GIFREADER [info]: plaintext extension ignored' infoPrintCR. |
882 | 531 |
subBlockSize := aStream nextByte. |
532 |
left := aStream nextShortMSB:false. |
|
533 |
top := aStream nextShortMSB:false. |
|
534 |
width := aStream nextShortMSB:false. |
|
535 |
height := aStream nextShortMSB:false. |
|
536 |
cWidth := aStream nextByte. |
|
537 |
cHeight := aStream nextByte. |
|
538 |
fg := aStream nextByte. |
|
539 |
bg := aStream nextByte. |
|
540 |
aStream skip:12. |
|
541 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
|
542 |
aStream skip:subBlockSize |
|
543 |
]. |
|
544 |
^ self |
|
239 | 545 |
]. |
546 |
||
547 |
type == 16rF9 ifTrue:[ |
|
882 | 548 |
"/ |
549 |
"/ graphic control extension |
|
550 |
"/ |
|
888 | 551 |
"/ 'GIFREADER [info]: graphic control extension' infoPrintCR. |
670
6a7f628ee66c
oops - mask was only set for interlaced images (stupid typo)
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
552 |
|
882 | 553 |
[(subBlockSize := aStream nextByte) ~~ 0] whileTrue:[ |
554 |
"/ type bitAnd:1 means: animationMask is transparent pixel |
|
555 |
"/ to be implemented in Image ... |
|
305 | 556 |
|
882 | 557 |
animationType := aStream nextByte. |
558 |
animationTime := aStream nextShortMSB:false. |
|
559 |
animationMask := aStream nextByte. |
|
560 |
subBlockSize := subBlockSize - 4. |
|
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
561 |
|
882 | 562 |
(animationType bitTest: 1) ifTrue:[ |
563 |
maskPixel := animationMask. |
|
670
6a7f628ee66c
oops - mask was only set for interlaced images (stupid typo)
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
564 |
"/ 'GIFREADER [info]: mask: ' infoPrint. (maskPixel printStringRadix:16) infoPrintCR. |
882 | 565 |
]. |
670
6a7f628ee66c
oops - mask was only set for interlaced images (stupid typo)
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
566 |
"/ 'GIFREADER [info]: animationTime: ' infoPrint. (animationTime * (1/100)) infoPrintCR. |
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
567 |
|
888 | 568 |
frameDelay := (animationTime * (1/100)) * 1000. |
569 |
||
882 | 570 |
subBlockSize ~~ 0 ifTrue:[ |
571 |
aStream skip:subBlockSize |
|
572 |
]. |
|
573 |
]. |
|
574 |
^ self |
|
239 | 575 |
]. |
576 |
||
519 | 577 |
type == 16rFE ifTrue:[ |
882 | 578 |
"/ |
579 |
"/ comment extension |
|
580 |
"/ |
|
625 | 581 |
"/ 'GIFREADER [info]: comment extension ignored' infoPrintCR. |
882 | 582 |
[(blockSize := aStream nextByte) ~~ 0] whileTrue:[ |
583 |
aStream skip:blockSize |
|
584 |
]. |
|
585 |
^ self |
|
519 | 586 |
]. |
587 |
||
239 | 588 |
type == 16rFF ifTrue:[ |
882 | 589 |
"/ |
590 |
"/ application extension |
|
591 |
"/ |
|
592 |
subBlockSize := aStream nextByte. |
|
593 |
appID := (aStream nextBytes:8 ) asString. |
|
594 |
appAUTH := aStream nextBytes:3. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
595 |
|
882 | 596 |
subBlockSize := aStream nextByte. |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
597 |
|
882 | 598 |
ok := false. |
599 |
appID = 'NETSCAPE' ifTrue:[ |
|
600 |
appAUTH asString = '2.0' ifTrue:[ |
|
601 |
subBlockSize == 3 ifTrue:[ |
|
602 |
b := aStream nextByte. |
|
603 |
iterationCount := aStream nextShortMSB:false. |
|
604 |
subBlockSize := aStream nextByte. |
|
605 |
ok := true. |
|
888 | 606 |
"/ ('GIFREADER [info]: NETSCAPE application extension - iterationCount = ') infoPrint. |
607 |
"/ iterationCount infoPrintCR. |
|
882 | 608 |
] |
609 |
] |
|
610 |
]. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
611 |
|
882 | 612 |
ok ifFalse:[ |
613 |
('GIFREADER [info]: application extension (' , appID , ') ignored') infoPrintCR. |
|
614 |
]. |
|
625 | 615 |
|
882 | 616 |
[subBlockSize > 0] whileTrue:[ |
617 |
aStream skip:subBlockSize. |
|
618 |
subBlockSize := aStream nextByte. |
|
619 |
]. |
|
620 |
^ self |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
621 |
]. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
622 |
|
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
623 |
type == 16r2C ifTrue:[ |
882 | 624 |
"/ |
625 |
"/ image descriptor extension |
|
626 |
"/ |
|
888 | 627 |
"/ 'GIFREADER [info]: image descriptor extension ignored' infoPrintCR. |
882 | 628 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
629 |
aStream skip:subBlockSize |
|
630 |
]. |
|
631 |
^ self |
|
239 | 632 |
]. |
633 |
||
634 |
"/ |
|
635 |
"/ unknown extension |
|
636 |
"/ |
|
354
b4d2ce853c24
stefans suggested info/warning/error/fatal
Claus Gittinger <cg@exept.de>
parents:
339
diff
changeset
|
637 |
'GIFREADER [info]: unknown extension ignored' infoPrintCR. |
239 | 638 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
882 | 639 |
aStream skip:subBlockSize |
154 | 640 |
] |
641 |
||
888 | 642 |
"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
|
643 |
! |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
644 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
645 |
readImage:aStream |
882 | 646 |
"read a single image from aStream." |
647 |
||
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
648 |
|leftOffs topOffs flag interlaced hasLocalColorMap bitsPerPixel colorMapSize |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
649 |
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
|
650 |
initialBuffSize| |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
651 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
652 |
"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
|
653 |
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
|
654 |
topOffs := 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
|
655 |
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
|
656 |
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
|
657 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
658 |
dimensionCallBack notNil ifTrue:[ |
882 | 659 |
dimensionCallBack value:self |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
660 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
661 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
662 |
"/ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
663 |
"/ '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
|
664 |
"/ '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
|
665 |
"/ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
666 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
667 |
"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
|
668 |
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
|
669 |
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
|
670 |
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
|
671 |
"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
|
672 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
673 |
"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
|
674 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
675 |
hasLocalColorMap ifTrue:[ |
882 | 676 |
"local descr. overwrites" |
677 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
|
678 |
colorMapSize := 1 bitShift:bitsPerPixel. |
|
679 |
"overwrite colormap" |
|
680 |
self readColorMap:colorMapSize. |
|
681 |
colorMap := Colormap |
|
682 |
redVector:redMap |
|
683 |
greenVector:greenMap |
|
684 |
blueVector:blueMap. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
685 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
686 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
687 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
688 |
"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
|
689 |
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
|
690 |
(aStream respondsTo:#fileSize) ifTrue:[ |
882 | 691 |
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
|
692 |
] ifFalse:[ |
882 | 693 |
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
|
694 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
695 |
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
|
696 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
697 |
"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
|
698 |
index := 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
699 |
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
|
700 |
[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
|
701 |
(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
|
702 |
|t| |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
703 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
704 |
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
|
705 |
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
|
706 |
compressedData := t. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
707 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
708 |
|
882 | 709 |
aStream nextBytes:count into:compressedData startingAt:index blockSize:4096. |
710 |
index := index + count. |
|
711 |
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
|
712 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
713 |
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
|
714 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
715 |
h := height. |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
716 |
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
|
717 |
"/ '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
|
718 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
719 |
self class decompressGIFFrom:compressedData |
882 | 720 |
count:compressedSize |
721 |
into:data |
|
722 |
startingAt:1 |
|
723 |
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
|
724 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
725 |
interlaced ifTrue:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
726 |
"/ 'GIFREADER: deinterlacing ...' infoPrintCR. |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
727 |
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
|
728 |
|
882 | 729 |
"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
|
730 |
|
882 | 731 |
srcOffset := 1. |
732 |
0 to:(h - 1) by:8 do:[:dstRow | |
|
733 |
dstOffset := dstRow * width + 1. |
|
734 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
735 |
with:data startingAt:srcOffset. |
|
736 |
srcOffset := srcOffset + width. |
|
737 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
738 |
|
882 | 739 |
"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
|
740 |
|
882 | 741 |
4 to:(h - 1) by:8 do:[:dstRow | |
742 |
dstOffset := dstRow * width + 1. |
|
743 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
744 |
with:data startingAt:srcOffset. |
|
745 |
srcOffset := srcOffset + width. |
|
746 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
747 |
|
882 | 748 |
"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
|
749 |
|
882 | 750 |
2 to:(h - 1) by:4 do:[:dstRow | |
751 |
dstOffset := dstRow * width + 1. |
|
752 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
753 |
with:data startingAt:srcOffset. |
|
754 |
srcOffset := srcOffset + width. |
|
755 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
756 |
|
882 | 757 |
"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
|
758 |
|
882 | 759 |
1 to:(h - 1) by:2 do:[:dstRow | |
760 |
dstOffset := dstRow * width + 1. |
|
761 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
762 |
with:data startingAt:srcOffset. |
|
763 |
srcOffset := srcOffset + width. |
|
764 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
765 |
|
882 | 766 |
data := tmp. |
767 |
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
|
768 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
769 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
770 |
"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
|
771 |
"Modified: / 12.8.1998 / 13:55:32 / cg" |
0 | 772 |
! ! |
43 | 773 |
|
708 | 774 |
!GIFReader methodsFor:'writing to file'! |
775 |
||
776 |
save:image onFile:aFileName |
|
777 |
"save image as GIF file on aFileName" |
|
778 |
||
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
779 |
|aStream convertedImage| |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
780 |
|
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
781 |
image depth ~~ 8 ifTrue:[ |
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
782 |
Image errorSignal handle:[:ex | |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
783 |
ex return. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
784 |
] do:[ |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
785 |
convertedImage := Image newForDepth:8. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
786 |
convertedImage fromImage:image photometric:#palette. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
787 |
]. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
788 |
convertedImage notNil ifTrue:[ |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
789 |
^ self save:convertedImage onFile:aFileName |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
790 |
]. |
1206
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 |
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
793 |
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
|
794 |
]. |
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
795 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
796 |
aStream := FileStream newFileNamed:aFileName. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
797 |
aStream isNil ifTrue:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
798 |
^ Image fileCreationErrorSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
799 |
raiseWith:image |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
800 |
errorString:('file creation error: ' , aFileName asString). |
708 | 801 |
]. |
1313
e5842c031352
oops - missing period. period.
Claus Gittinger <cg@exept.de>
parents:
1206
diff
changeset
|
802 |
self save:image onStream:aStream. |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
803 |
aStream close. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
804 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
805 |
" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
806 |
|i| |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
807 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
808 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
809 |
GIFReader save:i onFile:'foo.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
810 |
(Image fromFile:'./foo.gif') inspect |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
811 |
" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
812 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
813 |
"Created: / 14.10.1997 / 17:40:12 / cg" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
814 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
815 |
! |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
816 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
817 |
save:image onStream:aStream |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
818 |
"save image in GIF-file-format onto aStream" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
819 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
820 |
image depth ~~ 8 ifTrue:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
821 |
^ Image cannotRepresentImageSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
822 |
raiseWith:image |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
823 |
errorString:('GIF (currently) only supports depth8 images'). |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
824 |
]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
825 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
826 |
outStream := aStream. |
708 | 827 |
outStream binary. |
828 |
||
714 | 829 |
mask := image mask. |
830 |
mask notNil ifTrue:[ |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
831 |
self assignTransparentPixelIn:image |
708 | 832 |
]. |
833 |
||
834 |
byteOrder := #lsb. |
|
835 |
width := image width. |
|
836 |
height := image height. |
|
837 |
photometric := image photometric. |
|
838 |
samplesPerPixel := image samplesPerPixel. |
|
839 |
bitsPerSample := image bitsPerSample. |
|
840 |
colorMap := image colorMap. |
|
841 |
data := image bits. |
|
842 |
||
843 |
self writeHeaderFor:image. |
|
714 | 844 |
maskPixel notNil ifTrue:[ |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
845 |
self writeMaskExtensionHeaderFor:image. |
714 | 846 |
]. |
847 |
||
708 | 848 |
self writeBitDataFor:image. |
714 | 849 |
|
850 |
outStream nextPut: Terminator. |
|
708 | 851 |
|
852 |
" |
|
853 |
|i| |
|
854 |
||
855 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
|
856 |
GIFReader save:i onFile:'foo.gif'. |
|
857 |
(Image fromFile:'./foo.gif') inspect |
|
858 |
" |
|
859 |
||
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
860 |
"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
|
861 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
708 | 862 |
! |
863 |
||
710 | 864 |
writeBitDataFor: image |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
865 |
"using modified Lempel-Ziv Welch algorithm." |
710 | 866 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
867 |
| bits bitsPerPixel t1 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
868 |
maxBits maxMaxCode tSize initCodeSize ent tShift fCode pixel index disp nomatch | |
710 | 869 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
870 |
outStream nextPut:ImageSeparator. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
871 |
self writeShort:0. "/ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
872 |
self writeShort:0. "/ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
873 |
self writeShort:width. "/ image size |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
874 |
self writeShort:height. |
714 | 875 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
876 |
interlace == true ifTrue:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
877 |
t1 := 64 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
878 |
] ifFalse:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
879 |
t1 := 0 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
880 |
]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
881 |
outStream nextPut:t1. "/ another flag |
714 | 882 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
883 |
bitsPerPixel := image bitsPerPixel. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
884 |
bits := image bits. |
710 | 885 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
886 |
pass := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
887 |
xpos := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
888 |
ypos := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
889 |
rowByteSize := image bytesPerRow. "/ width * 8 + 31 // 32 * 4. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
890 |
remainBitCount := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
891 |
bufByte := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
892 |
bufStream := WriteStream on: (ByteArray new: 256). |
708 | 893 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
894 |
maxBits := 12. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
895 |
maxMaxCode := 1 bitShift: maxBits. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
896 |
tSize := 5003. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
897 |
prefixTable := Array new: tSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
898 |
suffixTable := Array new: tSize. |
710 | 899 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
900 |
initCodeSize := bitsPerPixel <= 1 ifTrue: [2] ifFalse: [bitsPerPixel]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
901 |
outStream nextPut: initCodeSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
902 |
self setParameters: initCodeSize. |
710 | 903 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
904 |
tShift := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
905 |
fCode := tSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
906 |
[fCode < 65536] whileTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
907 |
[tShift := tShift + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
908 |
fCode := fCode * 2]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
909 |
tShift := 8 - tShift. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
910 |
1 to: tSize do: [:i | suffixTable at: i put: -1]. |
708 | 911 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
912 |
self writeCodeAndCheckCodeSize: clearCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
913 |
ent := self readPixelFrom: bits. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
914 |
[(pixel := self readPixelFrom: bits) == nil] whileFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
915 |
[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
916 |
fCode := (pixel bitShift: maxBits) + ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
917 |
index := ((pixel bitShift: tShift) bitXor: ent) + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
918 |
(suffixTable at: index) = fCode |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
919 |
ifTrue: [ent := prefixTable at: index] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
920 |
ifFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
921 |
[nomatch := true. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
922 |
(suffixTable at: index) >= 0 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
923 |
ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
924 |
[disp := tSize - index + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
925 |
index = 1 ifTrue: [disp := 1]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
926 |
"probe" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
927 |
[(index := index - disp) < 1 ifTrue: [index := index + tSize]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
928 |
(suffixTable at: index) = fCode |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
929 |
ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
930 |
[ent := prefixTable at: index. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
931 |
nomatch := false. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
932 |
"continue whileFalse:"]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
933 |
nomatch and: [(suffixTable at: index) > 0]] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
934 |
whileTrue: ["probe"]]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
935 |
"nomatch" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
936 |
nomatch ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
937 |
[self writeCodeAndCheckCodeSize: ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
938 |
ent := pixel. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
939 |
freeCode < maxMaxCode |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
940 |
ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
941 |
[prefixTable at: index put: freeCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
942 |
suffixTable at: index put: fCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
943 |
freeCode := freeCode + 1] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
944 |
ifFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
945 |
[self writeCodeAndCheckCodeSize: clearCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
946 |
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
|
947 |
self setParameters: initCodeSize]]]]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
948 |
prefixTable := suffixTable := nil. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
949 |
self writeCodeAndCheckCodeSize: ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
950 |
self writeCodeAndCheckCodeSize: eoiCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
951 |
self flushCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
952 |
outStream nextPut: 0. "zero-length packet" |
710 | 953 |
|
712 | 954 |
"Modified: 15.10.1997 / 19:56:28 / cg" |
708 | 955 |
! |
956 |
||
957 |
writeHeaderFor:image |
|
714 | 958 |
"write the gif header" |
708 | 959 |
|
960 |
|bitsPerPixel t1 n| |
|
961 |
||
962 |
bitsPerPixel := image bitsPerPixel. |
|
963 |
||
732 | 964 |
outStream nextPutAll: 'GIF89a' asByteArray. |
712 | 965 |
self writeShort:width. "/ screen size |
966 |
self writeShort:height. |
|
708 | 967 |
t1 := 128. |
712 | 968 |
t1 := t1 bitOr:(bitsPerPixel - 1 bitShift:5). |
969 |
t1 := t1 bitOr:(bitsPerPixel - 1). |
|
970 |
outStream nextPut:t1. "/ flag |
|
971 |
outStream nextPut:0. "/ background (not used) |
|
972 |
outStream nextPut:0. "/ aspect ratio |
|
708 | 973 |
|
713 | 974 |
0 to:(1 bitShift:bitsPerPixel)-1 do:[:pixel | |
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
975 |
|clr red green blue| |
712 | 976 |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
977 |
clr := image colorFromValue:pixel. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
978 |
clr isNil ifTrue:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
979 |
"/ unused colorMap slot |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
980 |
red := green := blue := 0. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
981 |
] ifFalse:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
982 |
red := (clr redByte). |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
983 |
green := (clr greenByte). |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
984 |
blue := (clr blueByte). |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
985 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
986 |
outStream |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
987 |
nextPut:red; nextPut:green; nextPut:blue. |
713 | 988 |
]. |
989 |
"/ n := 0. |
|
990 |
"/ image colorMap notNil ifTrue:[ |
|
991 |
"/ image colorMap do:[:clr | |
|
992 |
"/ |red green blue| |
|
993 |
"/ |
|
994 |
"/ clr isNil ifTrue:[ |
|
995 |
"/ "/ unused colorMap slot |
|
996 |
"/ red := green := blue := 0. |
|
997 |
"/ ] ifFalse:[ |
|
998 |
"/ red := (clr redByte). |
|
999 |
"/ green := (clr greenByte). |
|
1000 |
"/ blue := (clr blueByte). |
|
1001 |
"/ ]. |
|
1002 |
"/ outStream |
|
1003 |
"/ nextPut:red; nextPut:green; nextPut:blue. |
|
1004 |
"/ n := n + 1. |
|
1005 |
"/ ] |
|
1006 |
"/ ]. |
|
1007 |
"/ n+1 to:(1 bitShift:bitsPerPixel) do:[:i | |
|
1008 |
"/ outStream nextPut:0; nextPut:0; nextPut:0 |
|
1009 |
"/ ]. |
|
708 | 1010 |
|
732 | 1011 |
"Created: / 14.10.1997 / 17:41:28 / cg" |
1012 |
"Modified: / 31.10.1997 / 16:12:13 / cg" |
|
714 | 1013 |
! |
1014 |
||
1015 |
writeMaskExtensionHeaderFor:image |
|
1016 |
"write an extension header for the transparent pixel" |
|
1017 |
||
1018 |
outStream nextPut:Extension. |
|
1019 |
outStream nextPut:16rF9. "/ graphic control extension |
|
1020 |
outStream nextPut:4. "/ subBlockSize |
|
1021 |
||
1022 |
outStream nextPut:1. "/ animationType |
|
1023 |
outStream nextPutShort:1 MSB:false. "/ animationTime |
|
1024 |
outStream nextPut:maskPixel. "/ animationMask |
|
1025 |
||
1026 |
outStream nextPut:0. |
|
708 | 1027 |
! ! |
1028 |
||
339 | 1029 |
!GIFReader class methodsFor:'documentation'! |
135 | 1030 |
|
1031 |
version |
|
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
1032 |
^ '$Header: /cvs/stx/stx/libview2/GIFReader.st,v 1.76 2000-08-16 17:24:28 cg Exp $' |
135 | 1033 |
! ! |
43 | 1034 |
GIFReader initialize! |