author | Claus Gittinger <cg@exept.de> |
Fri, 04 Apr 2003 19:26:11 +0200 | |
changeset 1739 | 971f1a3970a3 |
parent 1711 | b3ba13167ee7 |
child 1745 | 4fa0fad2a463 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1991 by Claus Gittinger |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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"{ Package: 'stx:libview2' }" |
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ImageReader subclass:#GIFReader |
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instanceVariableNames:'pass xpos ypos rowByteSize remainBitCount bufByte bufStream |
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prefixTable suffixTable clearCode eoiCode freeCode codeSize |
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maxCode interlace frameDelay iterationCount leftOffs topOffs' |
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classVariableNames:'ImageSeparator Extension Terminator' |
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poolDictionaries:'' |
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category:'Graphics-Images-Support' |
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! |
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||
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!GIFReader class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1991 by Claus Gittinger |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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! |
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||
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documentation |
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" |
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this class provides methods for loading and saving GIF pictures. |
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It has been tested with some different GIF87a pictures, I dont |
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know, if it works with other GIF versions. |
45 |
GIF extension blocks are not handled. |
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GIF file writing is not implemented (use TIFF). |
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legal stuff extracted from GIF87a documentation: |
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CompuServe Incorporated hereby grants a limited, non-exclusive, royalty-free |
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license for the use of the Graphics Interchange Format(sm) in computer |
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software; computer software utilizing GIF(sm) must acknowledge ownership of the |
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Graphics Interchange Format and its Service Mark by CompuServe Incorporated, in |
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User and Technical Documentation. |
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||
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The Graphics Interchange Format(c) is the Copyright property of |
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CompuServe Incorporated. GIF(sm) is a Service Mark property of |
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CompuServe Incorporated. |
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[See also:] |
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Image Form Icon |
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BlitImageReader FaceReader JPEGReader PBMReader PCXReader |
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ST80FormReader SunRasterReader TargaReader TIFFReader WindowsIconReader |
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XBMReader XPMReader XWDReader |
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[author:] |
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Claus Gittinger |
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" |
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! ! |
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||
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!GIFReader class methodsFor:'initialization'! |
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initialize |
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"install myself in the Image classes fileFormat table |
398 | 76 |
for the `.gif' extensions." |
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ImageSeparator := $, asciiValue. |
79 |
Extension := $!! asciiValue. |
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Terminator := $; asciiValue. |
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MIMETypes defineImageType:'image/gif' suffix:'gif' reader:self. |
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"Modified: 14.10.1997 / 18:47:27 / cg" |
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! ! |
86 |
||
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!GIFReader class methodsFor:'testing'! |
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canRepresent:anImage |
90 |
"return true, if anImage can be represented in my file format. |
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GIF supports depth 8 images only." |
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anImage depth == 8 ifTrue:[^ true]. |
94 |
Transcript showCR:'GIFReader: images depth is ~~ 8.'. |
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"Created: 17.10.1997 / 20:19:20 / cg" |
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! |
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isValidImageFile:aFileName |
101 |
"return true, if aFileName contains a GIF image" |
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102 |
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103 |
|id inStream| |
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104 |
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inStream := self streamReadingFile:aFileName. |
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inStream isNil ifTrue:[^ false]. |
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inStream text. |
109 |
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1 | 110 |
id := String new:6. |
111 |
inStream nextBytes:6 into:id. |
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inStream close. |
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(id = 'GIF87a') ifFalse:[ |
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(id startsWith:'GIF') ifFalse:[^ false]. |
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id ~= 'GIF89a' ifTrue:[ |
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'GIFReader [info]: not a GIF87a/GIF89a file - hope that works' infoPrintCR. |
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] |
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]. |
121 |
^ true |
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"Modified: 10.1.1997 / 15:40:34 / cg" |
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! ! |
125 |
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!GIFReader methodsFor:'private - writing'! |
127 |
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assignTransparentPixelIn:image |
129 |
"find an usused pixelValue in the colorMap (or image)." |
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130 |
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131 |
|cmap usedPixelValues| |
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132 |
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133 |
(cmap := image colorMap) size > 0 ifTrue:[ |
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cmap size < 256 ifTrue:[ |
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maskPixel := cmap size. |
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^ self |
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] |
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]. |
139 |
||
140 |
usedPixelValues := image usedValues. |
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usedPixelValues size < (1 bitShift:image depth) ifTrue:[ |
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"/ there must be an unused pixelValue |
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maskPixel := ((0 to:(1 bitShift:image depth)-1) asSet removeAll:(usedPixelValues)) first. |
714 | 144 |
] ifFalse:[ |
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Image informationLostQuerySignal |
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146 |
raiseWith:image |
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147 |
errorString:('GIF writer cannot assign a transparent pixel - all pixelValues used by image'). |
714 | 148 |
] |
149 |
! |
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150 |
||
708 | 151 |
checkCodeSize |
152 |
(freeCode > maxCode and: [codeSize < 12]) |
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153 |
ifTrue: |
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[codeSize := codeSize + 1. |
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155 |
maxCode := (1 bitShift: codeSize) - 1] |
708 | 156 |
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157 |
"Created: 14.10.1997 / 18:42:01 / cg" |
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158 |
! |
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159 |
||
160 |
flushBits |
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161 |
remainBitCount = 0 |
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162 |
ifFalse: |
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[self nextBytePut: bufByte. |
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164 |
remainBitCount := 0]. |
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165 |
self flushBuffer |
708 | 166 |
|
167 |
"Modified: 14.10.1997 / 18:58:06 / cg" |
|
168 |
! |
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169 |
||
170 |
flushBuffer |
|
171 |
bufStream isEmpty ifTrue: [^ self]. |
|
172 |
outStream nextPut: bufStream size. |
|
173 |
outStream nextPutAll: bufStream contents. |
|
174 |
bufStream := WriteStream on: (ByteArray new: 256) |
|
175 |
||
176 |
"Modified: 14.10.1997 / 20:46:04 / cg" |
|
177 |
! |
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178 |
||
179 |
flushCode |
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180 |
self flushBits |
708 | 181 |
|
182 |
"Created: 14.10.1997 / 18:57:33 / cg" |
|
183 |
! |
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184 |
||
710 | 185 |
nextBitsPut: anInteger |
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186 |
| integer writeBitCount shiftCount | |
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187 |
shiftCount _ 0. |
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188 |
remainBitCount = 0 |
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189 |
ifTrue: |
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190 |
[writeBitCount _ 8. |
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191 |
integer _ anInteger] |
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192 |
ifFalse: |
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193 |
[writeBitCount _ remainBitCount. |
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194 |
integer _ bufByte + (anInteger bitShift: 8 - remainBitCount)]. |
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195 |
[writeBitCount < codeSize] |
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196 |
whileTrue: |
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197 |
[self nextBytePut: ((integer bitShift: shiftCount) bitAnd: 255). |
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198 |
shiftCount _ shiftCount - 8. |
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199 |
writeBitCount _ writeBitCount + 8]. |
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200 |
(remainBitCount _ writeBitCount - codeSize) = 0 |
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201 |
ifTrue: [self nextBytePut: (integer bitShift: shiftCount)] |
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202 |
ifFalse: [bufByte _ integer bitShift: shiftCount]. |
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203 |
^anInteger |
708 | 204 |
|
710 | 205 |
"Modified: 15.10.1997 / 16:50:30 / cg" |
708 | 206 |
! |
207 |
||
710 | 208 |
nextBytePut: aByte |
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209 |
bufStream nextPut: aByte. |
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210 |
bufStream size >= 254 ifTrue: [self flushBuffer] |
708 | 211 |
|
710 | 212 |
"Modified: 15.10.1997 / 16:50:52 / cg" |
708 | 213 |
! |
214 |
||
710 | 215 |
readPixelFrom: bits |
216 |
| pixel | |
|
708 | 217 |
ypos >= height ifTrue: [^ nil]. |
714 | 218 |
(maskPixel notNil |
219 |
and:[(mask pixelAtX:xpos y:ypos) == 0]) ifTrue:[ |
|
757
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|
220 |
pixel := maskPixel |
714 | 221 |
] ifFalse:[ |
757
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|
222 |
pixel := bits at: ypos * rowByteSize + xpos + 1. |
714 | 223 |
]. |
708 | 224 |
self updatePixelPosition. |
710 | 225 |
^ pixel |
708 | 226 |
|
227 |
"Created: 14.10.1997 / 18:43:50 / cg" |
|
710 | 228 |
"Modified: 15.10.1997 / 16:46:43 / cg" |
708 | 229 |
! |
230 |
||
231 |
setParameters:bitsPerPixel |
|
232 |
clearCode := 1 bitShift:bitsPerPixel. |
|
233 |
eoiCode := clearCode + 1. |
|
234 |
freeCode := clearCode + 2. |
|
235 |
codeSize := bitsPerPixel + 1. |
|
236 |
maxCode := (1 bitShift: codeSize) - 1 |
|
237 |
||
238 |
"Modified: 14.10.1997 / 20:09:48 / cg" |
|
239 |
! |
|
240 |
||
241 |
updatePixelPosition |
|
757
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242 |
(xpos _ xpos + 1) >= width ifFalse: [^ self]. |
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243 |
xpos _ 0. |
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|
244 |
interlace == true |
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245 |
ifFalse: |
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246 |
[ypos _ ypos + 1. |
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247 |
^ self]. |
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248 |
pass = 0 |
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249 |
ifTrue: |
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250 |
[(ypos _ ypos + 8) >= height |
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251 |
ifTrue: |
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252 |
[pass _ pass + 1. |
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253 |
ypos _ 4]. |
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|
254 |
^ self]. |
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|
255 |
pass = 1 |
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|
256 |
ifTrue: |
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|
257 |
[(ypos _ ypos + 8) >= height |
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diff
changeset
|
258 |
ifTrue: |
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|
259 |
[pass _ pass + 1. |
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|
260 |
ypos _ 2]. |
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|
261 |
^ self]. |
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|
262 |
pass = 2 |
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changeset
|
263 |
ifTrue: |
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diff
changeset
|
264 |
[(ypos _ ypos + 4) >= height |
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diff
changeset
|
265 |
ifTrue: |
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|
266 |
[pass _ pass + 1. |
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|
267 |
ypos _ 1]. |
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|
268 |
^ self]. |
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|
269 |
pass = 3 |
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|
270 |
ifTrue: |
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|
271 |
[ypos _ ypos + 2. |
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|
272 |
^ self]. |
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|
273 |
^ self error: 'can''t happen' |
708 | 274 |
|
275 |
"Modified: 14.10.1997 / 18:44:27 / cg" |
|
276 |
! |
|
277 |
||
710 | 278 |
writeCode: aCode |
279 |
self nextBitsPut: aCode |
|
708 | 280 |
|
281 |
"Created: 14.10.1997 / 18:38:35 / cg" |
|
710 | 282 |
"Modified: 15.10.1997 / 17:01:47 / cg" |
708 | 283 |
! |
284 |
||
285 |
writeCodeAndCheckCodeSize: t1 |
|
286 |
self writeCode: t1. |
|
287 |
self checkCodeSize |
|
288 |
||
289 |
"Created: 14.10.1997 / 18:38:24 / cg" |
|
290 |
"Modified: 14.10.1997 / 18:40:56 / cg" |
|
291 |
! ! |
|
292 |
||
0 | 293 |
!GIFReader methodsFor:'reading from file'! |
294 |
||
43 | 295 |
fromStream:aStream |
882 | 296 |
"read a stream containing a GIF image (or an image sequence). |
192 | 297 |
Leave image description in instance variables." |
43 | 298 |
|
708 | 299 |
|byte index flag count fileColorMap |
43 | 300 |
colorMapSize bitsPerPixel scrWidth scrHeight |
301 |
hasColorMap hasLocalColorMap interlaced id |
|
1429 | 302 |
codeLen |
43 | 303 |
compressedData compressedSize |
618
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changeset
|
304 |
tmp srcOffset dstOffset isGif89 atEnd |
888 | 305 |
h "{ Class: SmallInteger }" |
1429 | 306 |
img firstImage firstOffset firstFrameDelay frame imageCount| |
43 | 307 |
|
308 |
inStream := aStream. |
|
309 |
aStream binary. |
|
310 |
||
311 |
"GIF-files are always lsb (intel-world)" |
|
312 |
byteOrder := #lsb. |
|
313 |
||
331
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diff
changeset
|
314 |
id := ByteArray new:6. |
809
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|
315 |
(aStream nextBytes:6 into:id startingAt:1) ~~ 6 ifTrue:[ |
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|
316 |
^ self fileFormatError:'not a gif file (short read)'. |
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|
317 |
]. |
331
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changeset
|
318 |
id := id asString. |
43 | 319 |
|
320 |
"all I had for testing where GIF87a files; |
|
321 |
I hope later versions work too ..." |
|
322 |
||
154 | 323 |
isGif89 := false. |
43 | 324 |
(id ~= 'GIF87a') ifTrue:[ |
809
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changeset
|
325 |
(id startsWith:'GIF') ifFalse:[ |
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changeset
|
326 |
^ self fileFormatError:('not a gif file (id=''' , id , ''')'). |
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diff
changeset
|
327 |
]. |
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changeset
|
328 |
id ~= 'GIF89a' ifTrue:[ |
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diff
changeset
|
329 |
'GIFReader [info]: not a GIF87a/GIF89a file - hope that works' infoPrintCR. |
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diff
changeset
|
330 |
] |
43 | 331 |
]. |
332 |
||
333 |
"get screen dimensions (not used)" |
|
334 |
scrWidth := aStream nextShortMSB:false. |
|
335 |
scrHeight := aStream nextShortMSB:false. |
|
336 |
||
337 |
"get flag byte" |
|
338 |
flag := aStream nextByte. |
|
339 |
hasColorMap := (flag bitAnd:2r10000000) ~~ 0. |
|
340 |
"bitsPerRGB := ((flag bitAnd:2r01110000) bitShift:-4) + 1. " |
|
341 |
"colorMapSorted := ((flag bitAnd:2r00001000) ~~ 0. " |
|
342 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
|
343 |
colorMapSize := 1 bitShift:bitsPerPixel. |
|
344 |
||
345 |
"get background (not used)" |
|
346 |
aStream nextByte. |
|
347 |
||
348 |
"aspect ratio (not used)" |
|
349 |
aStream nextByte. |
|
350 |
||
351 |
"get colorMap" |
|
352 |
hasColorMap ifTrue:[ |
|
1739 | 353 |
fileColorMap := self readColorMap:colorMapSize. |
43 | 354 |
]. |
708 | 355 |
colorMap := fileColorMap. |
43 | 356 |
|
357 |
photometric := #palette. |
|
358 |
samplesPerPixel := 1. |
|
359 |
bitsPerSample := #(8). |
|
360 |
||
888 | 361 |
imageCount := 0. |
618
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diff
changeset
|
362 |
atEnd := false. |
ab83e72fd105
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parents:
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diff
changeset
|
363 |
[atEnd] whileFalse:[ |
809
0d39cb7c21a9
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diff
changeset
|
364 |
"gif89a extensions" |
43 | 365 |
|
809
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changeset
|
366 |
byte := aStream nextByte. |
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diff
changeset
|
367 |
byte == Extension ifTrue:[ |
888 | 368 |
"/ 'Ext' infoPrintCR. |
809
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changeset
|
369 |
self readExtension:aStream. |
0d39cb7c21a9
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diff
changeset
|
370 |
] ifFalse:[ |
0d39cb7c21a9
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parents:
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diff
changeset
|
371 |
(byte == Terminator) ifTrue:[ |
0d39cb7c21a9
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parents:
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diff
changeset
|
372 |
atEnd := true |
0d39cb7c21a9
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
373 |
] ifFalse:[ |
0d39cb7c21a9
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Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
374 |
"must be image separator" |
0d39cb7c21a9
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
375 |
(byte ~~ ImageSeparator) ifTrue:[ |
0d39cb7c21a9
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diff
changeset
|
376 |
^ self fileFormatError:('corrupted gif file (no IMAGESEP): ' , (byte printStringRadix:16)). |
0d39cb7c21a9
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parents:
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diff
changeset
|
377 |
]. |
888 | 378 |
"/ 'Img' infoPrintCR. |
809
0d39cb7c21a9
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diff
changeset
|
379 |
|
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
380 |
fileColorMap notNil ifTrue:[ |
0d39cb7c21a9
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parents:
757
diff
changeset
|
381 |
colorMap := fileColorMap. |
0d39cb7c21a9
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Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
382 |
]. |
1052
0a0a36bfaf21
handle primitiveFailure in decompression (corrupted file)
Claus Gittinger <cg@exept.de>
parents:
1037
diff
changeset
|
383 |
Object primitiveFailureSignal handle:[:ex | |
0a0a36bfaf21
handle primitiveFailure in decompression (corrupted file)
Claus Gittinger <cg@exept.de>
parents:
1037
diff
changeset
|
384 |
^ self fileFormatError:('corrupted gif file'). |
0a0a36bfaf21
handle primitiveFailure in decompression (corrupted file)
Claus Gittinger <cg@exept.de>
parents:
1037
diff
changeset
|
385 |
] do:[ |
0a0a36bfaf21
handle primitiveFailure in decompression (corrupted file)
Claus Gittinger <cg@exept.de>
parents:
1037
diff
changeset
|
386 |
self readImage:aStream. |
0a0a36bfaf21
handle primitiveFailure in decompression (corrupted file)
Claus Gittinger <cg@exept.de>
parents:
1037
diff
changeset
|
387 |
]. |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
388 |
|
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
389 |
maskPixel notNil ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
390 |
"/ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
391 |
"/ ok, there is a maskValue |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
392 |
"/ build a Depth1Image for it. |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
393 |
"/ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
394 |
self buildMaskFromColor:maskPixel |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
395 |
]. |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
396 |
|
888 | 397 |
imageCount == 0 ifTrue:[ |
398 |
img := self makeImage. |
|
891 | 399 |
"/ remember first image in case more come later. |
400 |
firstImage := img. |
|
401 |
firstFrameDelay := frameDelay. |
|
1429 | 402 |
firstOffset := (leftOffs @ topOffs). |
888 | 403 |
] ifFalse:[ |
404 |
imageCount == 1 ifTrue:[ |
|
405 |
imageSequence := ImageSequence new. |
|
406 |
img imageSequence:imageSequence. |
|
891 | 407 |
|
408 |
"/ add frame for first image. |
|
409 |
frame := ImageFrame new image:firstImage. |
|
410 |
frame delay:firstFrameDelay. |
|
1429 | 411 |
frame offset:firstOffset. |
888 | 412 |
imageSequence add:frame. |
413 |
]. |
|
414 |
img := self makeImage. |
|
415 |
img imageSequence:imageSequence. |
|
891 | 416 |
|
417 |
"/ add frame for this image. |
|
888 | 418 |
frame := ImageFrame new image:img. |
419 |
frame delay:frameDelay. |
|
1429 | 420 |
frame offset:(leftOffs @ topOffs). |
888 | 421 |
imageSequence add:frame. |
422 |
]. |
|
423 |
||
424 |
imageCount := imageCount + 1. |
|
425 |
||
426 |
frameDelay := nil. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
427 |
|
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
428 |
aStream atEnd ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
429 |
atEnd := true. |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
430 |
] |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
431 |
] |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
432 |
]. |
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
433 |
]. |
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
434 |
|
890 | 435 |
imageSequence notNil ifTrue:[ |
436 |
iterationCount notNil ifTrue:[ |
|
437 |
iterationCount == 0 ifTrue:[ |
|
438 |
imageSequence loop:true. |
|
439 |
] ifFalse:[ |
|
440 |
imageSequence loop:false. |
|
441 |
imageSequence iterationCount:iterationCount. |
|
442 |
] |
|
443 |
] |
|
444 |
]. |
|
445 |
||
888 | 446 |
" |
447 |
Image fromFile:'/home/cg/work/stx/goodies/bitmaps/gifImages/animated/vrml.gif' |
|
448 |
Image fromFile:'/home/cg/work/stx/goodies/bitmaps/gifImages/animated/arrow.gif' |
|
449 |
" |
|
450 |
||
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
451 |
"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
|
452 |
"Modified: / 21.8.1998 / 22:20:00 / cg" |
135 | 453 |
! |
454 |
||
455 |
makeGreyscale |
|
456 |
"not yet implemented/needed" |
|
457 |
! |
|
458 |
||
459 |
readColorMap:colorMapSize |
|
460 |
"get gif colormap consisting of colorMapSize entries" |
|
461 |
||
1739 | 462 |
|sz "{ Class: SmallInteger }" |
463 |
redMap greenMap blueMap| |
|
135 | 464 |
|
465 |
redMap := ByteArray uninitializedNew:colorMapSize. |
|
466 |
greenMap := ByteArray uninitializedNew:colorMapSize. |
|
467 |
blueMap := ByteArray uninitializedNew:colorMapSize. |
|
239 | 468 |
|
135 | 469 |
sz := colorMapSize. |
470 |
1 to:sz do:[:i | |
|
1739 | 471 |
redMap at:i put:(inStream nextByte). |
472 |
greenMap at:i put:(inStream nextByte). |
|
473 |
blueMap at:i put:(inStream nextByte) |
|
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
474 |
]. |
239 | 475 |
|
1739 | 476 |
^ Colormap |
477 |
redVector:redMap |
|
478 |
greenVector:greenMap |
|
479 |
blueVector:blueMap. |
|
480 |
||
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
481 |
"Modified: 21.6.1996 / 12:32:43 / cg" |
154 | 482 |
! |
483 |
||
484 |
readExtension:aStream |
|
882 | 485 |
"get gif89 extension" |
154 | 486 |
|
487 |
|type blockSize subBlockSize |
|
304 | 488 |
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
|
489 |
animationType animationTime animationMask |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
490 |
appID appAUTH |
888 | 491 |
b ok| |
154 | 492 |
|
493 |
type := aStream nextByte. |
|
494 |
type == $R asciiValue ifTrue:[ |
|
882 | 495 |
"/ |
496 |
"/ Ratio extension |
|
497 |
"/ |
|
498 |
'GIFREADER [info]: ratio extension ignored' infoPrintCR. |
|
499 |
blockSize := aStream nextByte. |
|
500 |
(blockSize == 2) ifTrue:[ |
|
501 |
aspNum := aStream nextByte. |
|
502 |
aspDen := aStream nextByte |
|
503 |
] ifFalse:[ |
|
504 |
aStream skip:blockSize |
|
505 |
]. |
|
506 |
"/ eat subblocks |
|
154 | 507 |
|
882 | 508 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
509 |
aStream skip:subBlockSize |
|
510 |
]. |
|
511 |
^ self |
|
239 | 512 |
]. |
513 |
||
514 |
type == 16r01 ifTrue:[ |
|
882 | 515 |
"/ |
516 |
"/ plaintext extension |
|
517 |
"/ |
|
625 | 518 |
"/ 'GIFREADER [info]: plaintext extension ignored' infoPrintCR. |
882 | 519 |
subBlockSize := aStream nextByte. |
520 |
left := aStream nextShortMSB:false. |
|
521 |
top := aStream nextShortMSB:false. |
|
522 |
width := aStream nextShortMSB:false. |
|
523 |
height := aStream nextShortMSB:false. |
|
524 |
cWidth := aStream nextByte. |
|
525 |
cHeight := aStream nextByte. |
|
526 |
fg := aStream nextByte. |
|
527 |
bg := aStream nextByte. |
|
528 |
aStream skip:12. |
|
529 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
|
530 |
aStream skip:subBlockSize |
|
531 |
]. |
|
532 |
^ self |
|
239 | 533 |
]. |
534 |
||
535 |
type == 16rF9 ifTrue:[ |
|
882 | 536 |
"/ |
537 |
"/ graphic control extension |
|
538 |
"/ |
|
888 | 539 |
"/ '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
|
540 |
|
882 | 541 |
[(subBlockSize := aStream nextByte) ~~ 0] whileTrue:[ |
542 |
"/ type bitAnd:1 means: animationMask is transparent pixel |
|
543 |
"/ to be implemented in Image ... |
|
305 | 544 |
|
882 | 545 |
animationType := aStream nextByte. |
546 |
animationTime := aStream nextShortMSB:false. |
|
547 |
animationMask := aStream nextByte. |
|
548 |
subBlockSize := subBlockSize - 4. |
|
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
549 |
|
882 | 550 |
(animationType bitTest: 1) ifTrue:[ |
551 |
maskPixel := animationMask. |
|
670
6a7f628ee66c
oops - mask was only set for interlaced images (stupid typo)
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
552 |
"/ 'GIFREADER [info]: mask: ' infoPrint. (maskPixel printStringRadix:16) infoPrintCR. |
882 | 553 |
]. |
670
6a7f628ee66c
oops - mask was only set for interlaced images (stupid typo)
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
554 |
"/ 'GIFREADER [info]: animationTime: ' infoPrint. (animationTime * (1/100)) infoPrintCR. |
1429 | 555 |
"/ 'GIFREADER [info]: animationType: ' infoPrint. (animationType) infoPrintCR. |
556 |
"/ 'GIFREADER [info]: animationMask: ' infoPrint. (animationMask) infoPrintCR. |
|
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
557 |
|
888 | 558 |
frameDelay := (animationTime * (1/100)) * 1000. |
559 |
||
882 | 560 |
subBlockSize ~~ 0 ifTrue:[ |
561 |
aStream skip:subBlockSize |
|
562 |
]. |
|
563 |
]. |
|
564 |
^ self |
|
239 | 565 |
]. |
566 |
||
519 | 567 |
type == 16rFE ifTrue:[ |
882 | 568 |
"/ |
569 |
"/ comment extension |
|
570 |
"/ |
|
625 | 571 |
"/ 'GIFREADER [info]: comment extension ignored' infoPrintCR. |
882 | 572 |
[(blockSize := aStream nextByte) ~~ 0] whileTrue:[ |
573 |
aStream skip:blockSize |
|
574 |
]. |
|
575 |
^ self |
|
519 | 576 |
]. |
577 |
||
239 | 578 |
type == 16rFF ifTrue:[ |
882 | 579 |
"/ |
580 |
"/ application extension |
|
581 |
"/ |
|
582 |
subBlockSize := aStream nextByte. |
|
583 |
appID := (aStream nextBytes:8 ) asString. |
|
584 |
appAUTH := aStream nextBytes:3. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
585 |
|
882 | 586 |
subBlockSize := aStream nextByte. |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
587 |
|
882 | 588 |
ok := false. |
589 |
appID = 'NETSCAPE' ifTrue:[ |
|
590 |
appAUTH asString = '2.0' ifTrue:[ |
|
591 |
subBlockSize == 3 ifTrue:[ |
|
592 |
b := aStream nextByte. |
|
593 |
iterationCount := aStream nextShortMSB:false. |
|
594 |
subBlockSize := aStream nextByte. |
|
595 |
ok := true. |
|
888 | 596 |
"/ ('GIFREADER [info]: NETSCAPE application extension - iterationCount = ') infoPrint. |
597 |
"/ iterationCount infoPrintCR. |
|
882 | 598 |
] |
599 |
] |
|
600 |
]. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
601 |
|
882 | 602 |
ok ifFalse:[ |
603 |
('GIFREADER [info]: application extension (' , appID , ') ignored') infoPrintCR. |
|
604 |
]. |
|
625 | 605 |
|
882 | 606 |
[subBlockSize > 0] whileTrue:[ |
607 |
aStream skip:subBlockSize. |
|
608 |
subBlockSize := aStream nextByte. |
|
609 |
]. |
|
610 |
^ self |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
611 |
]. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
612 |
|
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
613 |
type == 16r2C ifTrue:[ |
882 | 614 |
"/ |
615 |
"/ image descriptor extension |
|
616 |
"/ |
|
1429 | 617 |
"/ 'GIFREADER [info]: image descriptor extension ignored' infoPrintCR. |
882 | 618 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
619 |
aStream skip:subBlockSize |
|
620 |
]. |
|
621 |
^ self |
|
239 | 622 |
]. |
623 |
||
624 |
"/ |
|
625 |
"/ unknown extension |
|
626 |
"/ |
|
354
b4d2ce853c24
stefans suggested info/warning/error/fatal
Claus Gittinger <cg@exept.de>
parents:
339
diff
changeset
|
627 |
'GIFREADER [info]: unknown extension ignored' infoPrintCR. |
239 | 628 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
882 | 629 |
aStream skip:subBlockSize |
154 | 630 |
] |
631 |
||
888 | 632 |
"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
|
633 |
! |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
634 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
635 |
readImage:aStream |
882 | 636 |
"read a single image from aStream." |
637 |
||
1429 | 638 |
| 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
|
639 |
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
|
640 |
initialBuffSize| |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
641 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
642 |
"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
|
643 |
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
|
644 |
topOffs := aStream nextShortMSB:false. |
1429 | 645 |
"/ 'GIFReader: leftOffs ' infoPrint. leftOffs infoPrintCR. |
646 |
"/ '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
|
647 |
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
|
648 |
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
|
649 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
650 |
dimensionCallBack notNil ifTrue:[ |
882 | 651 |
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
|
652 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
653 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
654 |
"/ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
655 |
"/ '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
|
656 |
"/ '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
|
657 |
"/ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
658 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
659 |
"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
|
660 |
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
|
661 |
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
|
662 |
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
|
663 |
"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
|
664 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
665 |
"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
|
666 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
667 |
hasLocalColorMap ifTrue:[ |
882 | 668 |
"local descr. overwrites" |
669 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
|
670 |
colorMapSize := 1 bitShift:bitsPerPixel. |
|
671 |
"overwrite colormap" |
|
1739 | 672 |
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
|
673 |
]. |
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 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
676 |
"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
|
677 |
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
|
678 |
(aStream respondsTo:#fileSize) ifTrue:[ |
882 | 679 |
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
|
680 |
] ifFalse:[ |
882 | 681 |
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
|
682 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
683 |
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
|
684 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
685 |
"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
|
686 |
index := 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
687 |
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
|
688 |
[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
|
689 |
(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
|
690 |
|t| |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
691 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
692 |
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
|
693 |
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
|
694 |
compressedData := t. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
695 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
696 |
|
882 | 697 |
aStream nextBytes:count into:compressedData startingAt:index blockSize:4096. |
698 |
index := index + count. |
|
699 |
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
|
700 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
701 |
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
|
702 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
703 |
h := height. |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
704 |
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
|
705 |
"/ '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
|
706 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
707 |
self class decompressGIFFrom:compressedData |
882 | 708 |
count:compressedSize |
709 |
into:data |
|
710 |
startingAt:1 |
|
711 |
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
|
712 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
713 |
interlaced ifTrue:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
714 |
"/ 'GIFREADER: deinterlacing ...' infoPrintCR. |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
715 |
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
|
716 |
|
882 | 717 |
"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
|
718 |
|
882 | 719 |
srcOffset := 1. |
720 |
0 to:(h - 1) by:8 do:[:dstRow | |
|
721 |
dstOffset := dstRow * width + 1. |
|
722 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
723 |
with:data startingAt:srcOffset. |
|
724 |
srcOffset := srcOffset + width. |
|
725 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
726 |
|
882 | 727 |
"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
|
728 |
|
882 | 729 |
4 to:(h - 1) by:8 do:[:dstRow | |
730 |
dstOffset := dstRow * width + 1. |
|
731 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
732 |
with:data startingAt:srcOffset. |
|
733 |
srcOffset := srcOffset + width. |
|
734 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
735 |
|
882 | 736 |
"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
|
737 |
|
882 | 738 |
2 to:(h - 1) by:4 do:[:dstRow | |
739 |
dstOffset := dstRow * width + 1. |
|
740 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
741 |
with:data startingAt:srcOffset. |
|
742 |
srcOffset := srcOffset + width. |
|
743 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
744 |
|
882 | 745 |
"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
|
746 |
|
882 | 747 |
1 to:(h - 1) by:2 do:[:dstRow | |
748 |
dstOffset := dstRow * width + 1. |
|
749 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
750 |
with:data startingAt:srcOffset. |
|
751 |
srcOffset := srcOffset + width. |
|
752 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
753 |
|
882 | 754 |
data := tmp. |
755 |
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
|
756 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
757 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
758 |
"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
|
759 |
"Modified: / 12.8.1998 / 13:55:32 / cg" |
0 | 760 |
! ! |
43 | 761 |
|
708 | 762 |
!GIFReader methodsFor:'writing to file'! |
763 |
||
764 |
save:image onFile:aFileName |
|
765 |
"save image as GIF file on aFileName" |
|
766 |
||
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
767 |
|aStream convertedImage| |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
768 |
|
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
769 |
image depth ~~ 8 ifTrue:[ |
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
770 |
Image errorSignal handle:[:ex | |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
771 |
ex return. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
772 |
] do:[ |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
773 |
convertedImage := Image newForDepth:8. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
774 |
convertedImage fromImage:image photometric:#palette. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
775 |
]. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
776 |
convertedImage notNil ifTrue:[ |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
777 |
^ self save:convertedImage onFile:aFileName |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
778 |
]. |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
779 |
^ Image cannotRepresentImageSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
780 |
raiseWith:image |
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
781 |
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
|
782 |
]. |
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
783 |
|
1711
b3ba13167ee7
Handle openErrorSignal in preparition for change openErrorSignal
Stefan Vogel <sv@exept.de>
parents:
1521
diff
changeset
|
784 |
[ |
b3ba13167ee7
Handle openErrorSignal in preparition for change openErrorSignal
Stefan Vogel <sv@exept.de>
parents:
1521
diff
changeset
|
785 |
aStream := aFileName asFilename newReadWriteStream. |
b3ba13167ee7
Handle openErrorSignal in preparition for change openErrorSignal
Stefan Vogel <sv@exept.de>
parents:
1521
diff
changeset
|
786 |
] on:FileStream openErrorSignal do:[:ex| |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
787 |
^ Image fileCreationErrorSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
788 |
raiseWith:image |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
789 |
errorString:('file creation error: ' , aFileName asString). |
708 | 790 |
]. |
1313
e5842c031352
oops - missing period. period.
Claus Gittinger <cg@exept.de>
parents:
1206
diff
changeset
|
791 |
self save:image onStream:aStream. |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
792 |
aStream close. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
793 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
794 |
" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
795 |
|i| |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
796 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
797 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
798 |
GIFReader save:i onFile:'foo.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
799 |
(Image fromFile:'./foo.gif') inspect |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
800 |
" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
801 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
802 |
"Created: / 14.10.1997 / 17:40:12 / cg" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
803 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
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 |
save:image onStream:aStream |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
807 |
"save image in GIF-file-format onto aStream" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
808 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
809 |
image depth ~~ 8 ifTrue:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
810 |
^ Image cannotRepresentImageSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
811 |
raiseWith:image |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
812 |
errorString:('GIF (currently) only supports depth8 images'). |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
813 |
]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
814 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
815 |
outStream := aStream. |
708 | 816 |
outStream binary. |
817 |
||
714 | 818 |
mask := image mask. |
819 |
mask notNil ifTrue:[ |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
820 |
self assignTransparentPixelIn:image |
708 | 821 |
]. |
822 |
||
823 |
byteOrder := #lsb. |
|
824 |
width := image width. |
|
825 |
height := image height. |
|
826 |
photometric := image photometric. |
|
827 |
samplesPerPixel := image samplesPerPixel. |
|
828 |
bitsPerSample := image bitsPerSample. |
|
829 |
colorMap := image colorMap. |
|
830 |
data := image bits. |
|
831 |
||
832 |
self writeHeaderFor:image. |
|
714 | 833 |
maskPixel notNil ifTrue:[ |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
834 |
self writeMaskExtensionHeaderFor:image. |
714 | 835 |
]. |
836 |
||
708 | 837 |
self writeBitDataFor:image. |
714 | 838 |
|
839 |
outStream nextPut: Terminator. |
|
708 | 840 |
|
841 |
" |
|
842 |
|i| |
|
843 |
||
844 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
|
845 |
GIFReader save:i onFile:'foo.gif'. |
|
846 |
(Image fromFile:'./foo.gif') inspect |
|
847 |
" |
|
848 |
||
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
849 |
"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
|
850 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
708 | 851 |
! |
852 |
||
710 | 853 |
writeBitDataFor: image |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
854 |
"using modified Lempel-Ziv Welch algorithm." |
710 | 855 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
856 |
| bits bitsPerPixel t1 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
857 |
maxBits maxMaxCode tSize initCodeSize ent tShift fCode pixel index disp nomatch | |
710 | 858 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
859 |
outStream nextPut:ImageSeparator. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
860 |
self writeShort:0. "/ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
861 |
self writeShort:0. "/ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
862 |
self writeShort:width. "/ image size |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
863 |
self writeShort:height. |
714 | 864 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
865 |
interlace == true ifTrue:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
866 |
t1 := 64 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
867 |
] ifFalse:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
868 |
t1 := 0 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
869 |
]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
870 |
outStream nextPut:t1. "/ another flag |
714 | 871 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
872 |
bitsPerPixel := image bitsPerPixel. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
873 |
bits := image bits. |
710 | 874 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
875 |
pass := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
876 |
xpos := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
877 |
ypos := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
878 |
rowByteSize := image bytesPerRow. "/ width * 8 + 31 // 32 * 4. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
879 |
remainBitCount := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
880 |
bufByte := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
881 |
bufStream := WriteStream on: (ByteArray new: 256). |
708 | 882 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
883 |
maxBits := 12. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
884 |
maxMaxCode := 1 bitShift: maxBits. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
885 |
tSize := 5003. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
886 |
prefixTable := Array new: tSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
887 |
suffixTable := Array new: tSize. |
710 | 888 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
889 |
initCodeSize := bitsPerPixel <= 1 ifTrue: [2] ifFalse: [bitsPerPixel]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
890 |
outStream nextPut: initCodeSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
891 |
self setParameters: initCodeSize. |
710 | 892 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
893 |
tShift := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
894 |
fCode := tSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
895 |
[fCode < 65536] whileTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
896 |
[tShift := tShift + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
897 |
fCode := fCode * 2]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
898 |
tShift := 8 - tShift. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
899 |
1 to: tSize do: [:i | suffixTable at: i put: -1]. |
708 | 900 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
901 |
self writeCodeAndCheckCodeSize: clearCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
902 |
ent := self readPixelFrom: bits. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
903 |
[(pixel := self readPixelFrom: bits) == nil] whileFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
904 |
[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
905 |
fCode := (pixel bitShift: maxBits) + ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
906 |
index := ((pixel bitShift: tShift) bitXor: ent) + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
907 |
(suffixTable at: index) = fCode |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
908 |
ifTrue: [ent := prefixTable at: index] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
909 |
ifFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
910 |
[nomatch := true. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
911 |
(suffixTable at: index) >= 0 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
912 |
ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
913 |
[disp := tSize - index + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
914 |
index = 1 ifTrue: [disp := 1]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
915 |
"probe" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
916 |
[(index := index - disp) < 1 ifTrue: [index := index + tSize]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
917 |
(suffixTable at: index) = fCode |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
918 |
ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
919 |
[ent := prefixTable at: index. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
920 |
nomatch := false. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
921 |
"continue whileFalse:"]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
922 |
nomatch and: [(suffixTable at: index) > 0]] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
923 |
whileTrue: ["probe"]]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
924 |
"nomatch" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
925 |
nomatch ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
926 |
[self writeCodeAndCheckCodeSize: ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
927 |
ent := pixel. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
928 |
freeCode < maxMaxCode |
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 |
[prefixTable at: index put: freeCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
931 |
suffixTable at: index put: fCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
932 |
freeCode := freeCode + 1] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
933 |
ifFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
934 |
[self writeCodeAndCheckCodeSize: clearCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
935 |
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
|
936 |
self setParameters: initCodeSize]]]]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
937 |
prefixTable := suffixTable := nil. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
938 |
self writeCodeAndCheckCodeSize: ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
939 |
self writeCodeAndCheckCodeSize: eoiCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
940 |
self flushCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
941 |
outStream nextPut: 0. "zero-length packet" |
710 | 942 |
|
712 | 943 |
"Modified: 15.10.1997 / 19:56:28 / cg" |
708 | 944 |
! |
945 |
||
946 |
writeHeaderFor:image |
|
714 | 947 |
"write the gif header" |
708 | 948 |
|
949 |
|bitsPerPixel t1 n| |
|
950 |
||
951 |
bitsPerPixel := image bitsPerPixel. |
|
952 |
||
732 | 953 |
outStream nextPutAll: 'GIF89a' asByteArray. |
712 | 954 |
self writeShort:width. "/ screen size |
955 |
self writeShort:height. |
|
708 | 956 |
t1 := 128. |
712 | 957 |
t1 := t1 bitOr:(bitsPerPixel - 1 bitShift:5). |
958 |
t1 := t1 bitOr:(bitsPerPixel - 1). |
|
959 |
outStream nextPut:t1. "/ flag |
|
960 |
outStream nextPut:0. "/ background (not used) |
|
961 |
outStream nextPut:0. "/ aspect ratio |
|
708 | 962 |
|
713 | 963 |
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
|
964 |
|clr red green blue| |
712 | 965 |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
966 |
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
|
967 |
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
|
968 |
"/ 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
|
969 |
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
|
970 |
] ifFalse:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
971 |
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
|
972 |
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
|
973 |
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
|
974 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
975 |
outStream |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
976 |
nextPut:red; nextPut:green; nextPut:blue. |
713 | 977 |
]. |
978 |
"/ n := 0. |
|
979 |
"/ image colorMap notNil ifTrue:[ |
|
980 |
"/ image colorMap do:[:clr | |
|
981 |
"/ |red green blue| |
|
982 |
"/ |
|
983 |
"/ clr isNil ifTrue:[ |
|
984 |
"/ "/ unused colorMap slot |
|
985 |
"/ red := green := blue := 0. |
|
986 |
"/ ] ifFalse:[ |
|
987 |
"/ red := (clr redByte). |
|
988 |
"/ green := (clr greenByte). |
|
989 |
"/ blue := (clr blueByte). |
|
990 |
"/ ]. |
|
991 |
"/ outStream |
|
992 |
"/ nextPut:red; nextPut:green; nextPut:blue. |
|
993 |
"/ n := n + 1. |
|
994 |
"/ ] |
|
995 |
"/ ]. |
|
996 |
"/ n+1 to:(1 bitShift:bitsPerPixel) do:[:i | |
|
997 |
"/ outStream nextPut:0; nextPut:0; nextPut:0 |
|
998 |
"/ ]. |
|
708 | 999 |
|
732 | 1000 |
"Created: / 14.10.1997 / 17:41:28 / cg" |
1001 |
"Modified: / 31.10.1997 / 16:12:13 / cg" |
|
714 | 1002 |
! |
1003 |
||
1004 |
writeMaskExtensionHeaderFor:image |
|
1005 |
"write an extension header for the transparent pixel" |
|
1006 |
||
1007 |
outStream nextPut:Extension. |
|
1008 |
outStream nextPut:16rF9. "/ graphic control extension |
|
1009 |
outStream nextPut:4. "/ subBlockSize |
|
1010 |
||
1011 |
outStream nextPut:1. "/ animationType |
|
1012 |
outStream nextPutShort:1 MSB:false. "/ animationTime |
|
1013 |
outStream nextPut:maskPixel. "/ animationMask |
|
1014 |
||
1015 |
outStream nextPut:0. |
|
708 | 1016 |
! ! |
1017 |
||
339 | 1018 |
!GIFReader class methodsFor:'documentation'! |
135 | 1019 |
|
1020 |
version |
|
1739 | 1021 |
^ '$Header: /cvs/stx/stx/libview2/GIFReader.st,v 1.80 2003-04-04 17:25:46 cg Exp $' |
135 | 1022 |
! ! |
1711
b3ba13167ee7
Handle openErrorSignal in preparition for change openErrorSignal
Stefan Vogel <sv@exept.de>
parents:
1521
diff
changeset
|
1023 |
|
43 | 1024 |
GIFReader initialize! |