author | Claus Gittinger <cg@exept.de> |
Thu, 10 Apr 2003 16:26:11 +0200 | |
changeset 1745 | 4fa0fad2a463 |
parent 1739 | 971f1a3970a3 |
child 1755 | f61db1006d4f |
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 |
17 |
prefixTable suffixTable clearCode eoiCode freeCode codeSize |
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maxCode interlace frameDelay iterationCount leftOffs topOffs' |
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classVariableNames:'ImageSeparator Extension Terminator' |
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poolDictionaries:'' |
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category:'Graphics-Images-Readers' |
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! |
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||
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!GIFReader class methodsFor:'documentation'! |
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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 |
|
33 |
inclusion of the above copyright notice. This software may not |
|
34 |
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. |
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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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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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||
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inStream text. |
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id := String new:6. |
111 |
inStream nextBytes:6 into:id. |
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inStream close. |
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(id = 'GIF87a') ifFalse:[ |
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(id startsWith:'GIF') ifFalse:[^ false]. |
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id ~= 'GIF89a' ifTrue:[ |
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'GIFReader [info]: not a GIF87a/GIF89a file - hope that works' infoPrintCR. |
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] |
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]. |
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^ true |
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174 | 122 |
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"Modified: 10.1.1997 / 15:40:34 / cg" |
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! ! |
125 |
||
708 | 126 |
!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 |
||
131 |
|cmap usedPixelValues| |
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132 |
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(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. |
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] ifFalse:[ |
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145 |
Image informationLostQuerySignal |
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146 |
raiseWith:image |
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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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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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remainBitCount = 0 |
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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:[ |
|
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220 |
pixel := maskPixel |
714 | 221 |
] ifFalse:[ |
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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 |
|
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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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diff
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|
256 |
ifTrue: |
094c6c7c4ce6
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diff
changeset
|
257 |
[(ypos _ ypos + 8) >= height |
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diff
changeset
|
258 |
ifTrue: |
094c6c7c4ce6
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diff
changeset
|
259 |
[pass _ pass + 1. |
094c6c7c4ce6
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|
260 |
ypos _ 2]. |
094c6c7c4ce6
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diff
changeset
|
261 |
^ self]. |
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diff
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|
262 |
pass = 2 |
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diff
changeset
|
263 |
ifTrue: |
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parents:
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diff
changeset
|
264 |
[(ypos _ ypos + 4) >= height |
094c6c7c4ce6
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diff
changeset
|
265 |
ifTrue: |
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diff
changeset
|
266 |
[pass _ pass + 1. |
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changeset
|
267 |
ypos _ 1]. |
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changeset
|
268 |
^ self]. |
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diff
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|
269 |
pass = 3 |
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diff
changeset
|
270 |
ifTrue: |
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diff
changeset
|
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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parents:
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diff
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
304f9c439efa
allow reading from ByteArray-readStreams
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parents:
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diff
changeset
|
314 |
id := ByteArray new:6. |
809
0d39cb7c21a9
use common fileFormatError reporter
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parents:
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diff
changeset
|
315 |
(aStream nextBytes:6 into:id startingAt:1) ~~ 6 ifTrue:[ |
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changeset
|
316 |
^ self fileFormatError:'not a gif file (short read)'. |
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diff
changeset
|
317 |
]. |
331
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diff
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
0d39cb7c21a9
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diff
changeset
|
325 |
(id startsWith:'GIF') ifFalse:[ |
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diff
changeset
|
326 |
^ self fileFormatError:('not a gif file (id=''' , id , ''')'). |
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diff
changeset
|
327 |
]. |
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diff
changeset
|
328 |
id ~= 'GIF89a' ifTrue:[ |
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diff
changeset
|
329 |
'GIFReader [info]: not a GIF87a/GIF89a file - hope that works' infoPrintCR. |
0d39cb7c21a9
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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
ab83e72fd105
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parents:
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diff
changeset
|
362 |
atEnd := false. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
363 |
[atEnd] whileFalse:[ |
809
0d39cb7c21a9
use common fileFormatError reporter
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parents:
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diff
changeset
|
364 |
"gif89a extensions" |
43 | 365 |
|
809
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diff
changeset
|
366 |
byte := aStream nextByte. |
0d39cb7c21a9
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parents:
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diff
changeset
|
367 |
byte == Extension ifTrue:[ |
888 | 368 |
"/ 'Ext' infoPrintCR. |
809
0d39cb7c21a9
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diff
changeset
|
369 |
self readExtension:aStream. |
0d39cb7c21a9
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
370 |
] ifFalse:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
371 |
(byte == Terminator) ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
372 |
atEnd := true |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
373 |
] ifFalse:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
374 |
"must be image separator" |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
375 |
(byte ~~ ImageSeparator) ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
376 |
^ self fileFormatError:('corrupted gif file (no IMAGESEP): ' , (byte printStringRadix:16)). |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
377 |
]. |
888 | 378 |
"/ 'Img' infoPrintCR. |
809
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
379 |
|
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
380 |
fileColorMap notNil ifTrue:[ |
0d39cb7c21a9
use common fileFormatError reporter
Claus Gittinger <cg@exept.de>
parents:
757
diff
changeset
|
381 |
colorMap := fileColorMap. |
0d39cb7c21a9
use common fileFormatError reporter
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 |
|
1745
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
460 |
"get a gif colormap consisting of colorMapSize entries" |
135 | 461 |
|
1745
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
462 |
|rgbVector| |
135 | 463 |
|
1745
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
464 |
rgbVector := inStream nextBytes:colorMapSize*3. |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
465 |
^ Colormap rgbVector:rgbVector |
239 | 466 |
|
1745
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
467 |
"/ |sz "{ Class: SmallInteger }" |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
468 |
"/ redMap greenMap blueMap| |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
469 |
"/ |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
470 |
"/ redMap := ByteArray uninitializedNew:colorMapSize. |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
471 |
"/ greenMap := ByteArray uninitializedNew:colorMapSize. |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
472 |
"/ blueMap := ByteArray uninitializedNew:colorMapSize. |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
473 |
"/ |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
474 |
"/ sz := colorMapSize. |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
475 |
"/ 1 to:sz do:[:i | |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
476 |
"/ redMap at:i put:(inStream nextByte). |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
477 |
"/ greenMap at:i put:(inStream nextByte). |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
478 |
"/ blueMap at:i put:(inStream nextByte) |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
479 |
"/ ]. |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
480 |
"/ |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
481 |
"/ ^ Colormap |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
482 |
"/ redVector:redMap |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
483 |
"/ greenVector:greenMap |
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
484 |
"/ blueVector:blueMap. |
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
485 |
"Modified: 21.6.1996 / 12:32:43 / cg" |
154 | 486 |
! |
487 |
||
488 |
readExtension:aStream |
|
882 | 489 |
"get gif89 extension" |
154 | 490 |
|
491 |
|type blockSize subBlockSize |
|
304 | 492 |
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
|
493 |
animationType animationTime animationMask |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
494 |
appID appAUTH |
888 | 495 |
b ok| |
154 | 496 |
|
497 |
type := aStream nextByte. |
|
498 |
type == $R asciiValue ifTrue:[ |
|
882 | 499 |
"/ |
500 |
"/ Ratio extension |
|
501 |
"/ |
|
502 |
'GIFREADER [info]: ratio extension ignored' infoPrintCR. |
|
503 |
blockSize := aStream nextByte. |
|
504 |
(blockSize == 2) ifTrue:[ |
|
505 |
aspNum := aStream nextByte. |
|
506 |
aspDen := aStream nextByte |
|
507 |
] ifFalse:[ |
|
508 |
aStream skip:blockSize |
|
509 |
]. |
|
510 |
"/ eat subblocks |
|
154 | 511 |
|
882 | 512 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
513 |
aStream skip:subBlockSize |
|
514 |
]. |
|
515 |
^ self |
|
239 | 516 |
]. |
517 |
||
518 |
type == 16r01 ifTrue:[ |
|
882 | 519 |
"/ |
520 |
"/ plaintext extension |
|
521 |
"/ |
|
625 | 522 |
"/ 'GIFREADER [info]: plaintext extension ignored' infoPrintCR. |
882 | 523 |
subBlockSize := aStream nextByte. |
524 |
left := aStream nextShortMSB:false. |
|
525 |
top := aStream nextShortMSB:false. |
|
526 |
width := aStream nextShortMSB:false. |
|
527 |
height := aStream nextShortMSB:false. |
|
528 |
cWidth := aStream nextByte. |
|
529 |
cHeight := aStream nextByte. |
|
530 |
fg := aStream nextByte. |
|
531 |
bg := aStream nextByte. |
|
532 |
aStream skip:12. |
|
533 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
|
534 |
aStream skip:subBlockSize |
|
535 |
]. |
|
536 |
^ self |
|
239 | 537 |
]. |
538 |
||
539 |
type == 16rF9 ifTrue:[ |
|
882 | 540 |
"/ |
541 |
"/ graphic control extension |
|
542 |
"/ |
|
888 | 543 |
"/ '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
|
544 |
|
882 | 545 |
[(subBlockSize := aStream nextByte) ~~ 0] whileTrue:[ |
546 |
"/ type bitAnd:1 means: animationMask is transparent pixel |
|
547 |
"/ to be implemented in Image ... |
|
305 | 548 |
|
882 | 549 |
animationType := aStream nextByte. |
550 |
animationTime := aStream nextShortMSB:false. |
|
551 |
animationMask := aStream nextByte. |
|
552 |
subBlockSize := subBlockSize - 4. |
|
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
553 |
|
882 | 554 |
(animationType bitTest: 1) ifTrue:[ |
555 |
maskPixel := animationMask. |
|
670
6a7f628ee66c
oops - mask was only set for interlaced images (stupid typo)
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
556 |
"/ 'GIFREADER [info]: mask: ' infoPrint. (maskPixel printStringRadix:16) infoPrintCR. |
882 | 557 |
]. |
670
6a7f628ee66c
oops - mask was only set for interlaced images (stupid typo)
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
558 |
"/ 'GIFREADER [info]: animationTime: ' infoPrint. (animationTime * (1/100)) infoPrintCR. |
1429 | 559 |
"/ 'GIFREADER [info]: animationType: ' infoPrint. (animationType) infoPrintCR. |
560 |
"/ 'GIFREADER [info]: animationMask: ' infoPrint. (animationMask) infoPrintCR. |
|
307
9eaeaca798a5
create a mask-image, if present
Claus Gittinger <cg@exept.de>
parents:
305
diff
changeset
|
561 |
|
888 | 562 |
frameDelay := (animationTime * (1/100)) * 1000. |
563 |
||
882 | 564 |
subBlockSize ~~ 0 ifTrue:[ |
565 |
aStream skip:subBlockSize |
|
566 |
]. |
|
567 |
]. |
|
568 |
^ self |
|
239 | 569 |
]. |
570 |
||
519 | 571 |
type == 16rFE ifTrue:[ |
882 | 572 |
"/ |
573 |
"/ comment extension |
|
574 |
"/ |
|
625 | 575 |
"/ 'GIFREADER [info]: comment extension ignored' infoPrintCR. |
882 | 576 |
[(blockSize := aStream nextByte) ~~ 0] whileTrue:[ |
577 |
aStream skip:blockSize |
|
578 |
]. |
|
579 |
^ self |
|
519 | 580 |
]. |
581 |
||
239 | 582 |
type == 16rFF ifTrue:[ |
882 | 583 |
"/ |
584 |
"/ application extension |
|
585 |
"/ |
|
586 |
subBlockSize := aStream nextByte. |
|
587 |
appID := (aStream nextBytes:8 ) asString. |
|
588 |
appAUTH := aStream nextBytes:3. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
589 |
|
882 | 590 |
subBlockSize := aStream nextByte. |
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
591 |
|
882 | 592 |
ok := false. |
593 |
appID = 'NETSCAPE' ifTrue:[ |
|
594 |
appAUTH asString = '2.0' ifTrue:[ |
|
595 |
subBlockSize == 3 ifTrue:[ |
|
596 |
b := aStream nextByte. |
|
597 |
iterationCount := aStream nextShortMSB:false. |
|
598 |
subBlockSize := aStream nextByte. |
|
599 |
ok := true. |
|
888 | 600 |
"/ ('GIFREADER [info]: NETSCAPE application extension - iterationCount = ') infoPrint. |
601 |
"/ iterationCount infoPrintCR. |
|
882 | 602 |
] |
603 |
] |
|
604 |
]. |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
605 |
|
882 | 606 |
ok ifFalse:[ |
607 |
('GIFREADER [info]: application extension (' , appID , ') ignored') infoPrintCR. |
|
608 |
]. |
|
625 | 609 |
|
882 | 610 |
[subBlockSize > 0] whileTrue:[ |
611 |
aStream skip:subBlockSize. |
|
612 |
subBlockSize := aStream nextByte. |
|
613 |
]. |
|
614 |
^ self |
|
618
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
615 |
]. |
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
616 |
|
ab83e72fd105
support multiple images (animated gif)
Claus Gittinger <cg@exept.de>
parents:
563
diff
changeset
|
617 |
type == 16r2C ifTrue:[ |
882 | 618 |
"/ |
619 |
"/ image descriptor extension |
|
620 |
"/ |
|
1429 | 621 |
"/ 'GIFREADER [info]: image descriptor extension ignored' infoPrintCR. |
882 | 622 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
623 |
aStream skip:subBlockSize |
|
624 |
]. |
|
625 |
^ self |
|
239 | 626 |
]. |
627 |
||
628 |
"/ |
|
629 |
"/ unknown extension |
|
630 |
"/ |
|
354
b4d2ce853c24
stefans suggested info/warning/error/fatal
Claus Gittinger <cg@exept.de>
parents:
339
diff
changeset
|
631 |
'GIFREADER [info]: unknown extension ignored' infoPrintCR. |
239 | 632 |
[(subBlockSize := aStream nextByte) > 0] whileTrue:[ |
882 | 633 |
aStream skip:subBlockSize |
154 | 634 |
] |
635 |
||
888 | 636 |
"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
|
637 |
! |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
638 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
639 |
readImage:aStream |
882 | 640 |
"read a single image from aStream." |
641 |
||
1429 | 642 |
| 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
|
643 |
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
|
644 |
initialBuffSize| |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
645 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
646 |
"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
|
647 |
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
|
648 |
topOffs := aStream nextShortMSB:false. |
1429 | 649 |
"/ 'GIFReader: leftOffs ' infoPrint. leftOffs infoPrintCR. |
650 |
"/ '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
|
651 |
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
|
652 |
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
|
653 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
654 |
dimensionCallBack notNil ifTrue:[ |
882 | 655 |
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
|
656 |
]. |
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 |
"/ '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
|
660 |
"/ '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
|
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 |
"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
|
664 |
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
|
665 |
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
|
666 |
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
|
667 |
"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
|
668 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
669 |
"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
|
670 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
671 |
hasLocalColorMap ifTrue:[ |
882 | 672 |
"local descr. overwrites" |
673 |
bitsPerPixel := (flag bitAnd:2r00000111) + 1. |
|
674 |
colorMapSize := 1 bitShift:bitsPerPixel. |
|
675 |
"overwrite colormap" |
|
1739 | 676 |
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
|
677 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
678 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
679 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
680 |
"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
|
681 |
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
|
682 |
(aStream respondsTo:#fileSize) ifTrue:[ |
882 | 683 |
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
|
684 |
] ifFalse:[ |
882 | 685 |
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
|
686 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
687 |
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
|
688 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
689 |
"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
|
690 |
index := 1. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
691 |
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
|
692 |
[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
|
693 |
(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
|
694 |
|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 |
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
|
697 |
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
|
698 |
compressedData := t. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
699 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
700 |
|
882 | 701 |
aStream nextBytes:count into:compressedData startingAt:index blockSize:4096. |
702 |
index := index + count. |
|
703 |
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
|
704 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
705 |
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
|
706 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
707 |
h := height. |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
708 |
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
|
709 |
"/ '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
|
710 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
711 |
self class decompressGIFFrom:compressedData |
882 | 712 |
count:compressedSize |
713 |
into:data |
|
714 |
startingAt:1 |
|
715 |
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
|
716 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
717 |
interlaced ifTrue:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
718 |
"/ 'GIFREADER: deinterlacing ...' infoPrintCR. |
1037
90d38c8e3f5f
use initialized byteArrays, in case rows are padded
Claus Gittinger <cg@exept.de>
parents:
891
diff
changeset
|
719 |
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
|
720 |
|
882 | 721 |
"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
|
722 |
|
882 | 723 |
srcOffset := 1. |
724 |
0 to:(h - 1) by:8 do:[:dstRow | |
|
725 |
dstOffset := dstRow * width + 1. |
|
726 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
727 |
with:data startingAt:srcOffset. |
|
728 |
srcOffset := srcOffset + width. |
|
729 |
]. |
|
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 |
"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
|
732 |
|
882 | 733 |
4 to:(h - 1) by:8 do:[:dstRow | |
734 |
dstOffset := dstRow * width + 1. |
|
735 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
736 |
with:data startingAt:srcOffset. |
|
737 |
srcOffset := srcOffset + width. |
|
738 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
739 |
|
882 | 740 |
"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
|
741 |
|
882 | 742 |
2 to:(h - 1) by:4 do:[:dstRow | |
743 |
dstOffset := dstRow * width + 1. |
|
744 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
745 |
with:data startingAt:srcOffset. |
|
746 |
srcOffset := srcOffset + width. |
|
747 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
748 |
|
882 | 749 |
"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
|
750 |
|
882 | 751 |
1 to:(h - 1) by:2 do:[:dstRow | |
752 |
dstOffset := dstRow * width + 1. |
|
753 |
tmp replaceFrom:dstOffset to:(dstOffset + width - 1) |
|
754 |
with:data startingAt:srcOffset. |
|
755 |
srcOffset := srcOffset + width. |
|
756 |
]. |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
757 |
|
882 | 758 |
data := tmp. |
759 |
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
|
760 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
761 |
|
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
762 |
"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
|
763 |
"Modified: / 12.8.1998 / 13:55:32 / cg" |
0 | 764 |
! ! |
43 | 765 |
|
708 | 766 |
!GIFReader methodsFor:'writing to file'! |
767 |
||
768 |
save:image onFile:aFileName |
|
769 |
"save image as GIF file on aFileName" |
|
770 |
||
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
771 |
|aStream convertedImage| |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
772 |
|
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
773 |
image depth ~~ 8 ifTrue:[ |
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
774 |
Image errorSignal handle:[:ex | |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
775 |
ex return. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
776 |
] do:[ |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
777 |
convertedImage := Image newForDepth:8. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
778 |
convertedImage fromImage:image photometric:#palette. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
779 |
]. |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
780 |
convertedImage notNil ifTrue:[ |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
781 |
^ self save:convertedImage onFile:aFileName |
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
782 |
]. |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
783 |
^ Image cannotRepresentImageSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
784 |
raiseWith:image |
1393
abed635fb3ce
convert non-depth8 images when trying to save
Claus Gittinger <cg@exept.de>
parents:
1313
diff
changeset
|
785 |
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
|
786 |
]. |
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
787 |
|
1711
b3ba13167ee7
Handle openErrorSignal in preparition for change openErrorSignal
Stefan Vogel <sv@exept.de>
parents:
1521
diff
changeset
|
788 |
[ |
b3ba13167ee7
Handle openErrorSignal in preparition for change openErrorSignal
Stefan Vogel <sv@exept.de>
parents:
1521
diff
changeset
|
789 |
aStream := aFileName asFilename newReadWriteStream. |
b3ba13167ee7
Handle openErrorSignal in preparition for change openErrorSignal
Stefan Vogel <sv@exept.de>
parents:
1521
diff
changeset
|
790 |
] on:FileStream openErrorSignal do:[:ex| |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
791 |
^ Image fileCreationErrorSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
792 |
raiseWith:image |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
793 |
errorString:('file creation error: ' , aFileName asString). |
708 | 794 |
]. |
1313
e5842c031352
oops - missing period. period.
Claus Gittinger <cg@exept.de>
parents:
1206
diff
changeset
|
795 |
self save:image onStream:aStream. |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
796 |
aStream close. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
797 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
798 |
" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
799 |
|i| |
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 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
802 |
GIFReader save:i onFile:'foo.gif'. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
803 |
(Image fromFile:'./foo.gif') inspect |
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 |
"Created: / 14.10.1997 / 17:40:12 / cg" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
807 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
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 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
810 |
save:image onStream:aStream |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
811 |
"save image in GIF-file-format onto aStream" |
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 |
image depth ~~ 8 ifTrue:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
814 |
^ Image cannotRepresentImageSignal |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
815 |
raiseWith:image |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
816 |
errorString:('GIF (currently) only supports depth8 images'). |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
817 |
]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
818 |
|
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
819 |
outStream := aStream. |
708 | 820 |
outStream binary. |
821 |
||
714 | 822 |
mask := image mask. |
823 |
mask notNil ifTrue:[ |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
824 |
self assignTransparentPixelIn:image |
708 | 825 |
]. |
826 |
||
827 |
byteOrder := #lsb. |
|
828 |
width := image width. |
|
829 |
height := image height. |
|
830 |
photometric := image photometric. |
|
831 |
samplesPerPixel := image samplesPerPixel. |
|
832 |
bitsPerSample := image bitsPerSample. |
|
833 |
colorMap := image colorMap. |
|
834 |
data := image bits. |
|
835 |
||
836 |
self writeHeaderFor:image. |
|
714 | 837 |
maskPixel notNil ifTrue:[ |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
838 |
self writeMaskExtensionHeaderFor:image. |
714 | 839 |
]. |
840 |
||
708 | 841 |
self writeBitDataFor:image. |
714 | 842 |
|
843 |
outStream nextPut: Terminator. |
|
708 | 844 |
|
845 |
" |
|
846 |
|i| |
|
847 |
||
848 |
i := Image fromFile:'bitmaps/gifImages/garfield.gif'. |
|
849 |
GIFReader save:i onFile:'foo.gif'. |
|
850 |
(Image fromFile:'./foo.gif') inspect |
|
851 |
" |
|
852 |
||
718
41ade132da98
raise an error, if depth is not supported.
Claus Gittinger <cg@exept.de>
parents:
714
diff
changeset
|
853 |
"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
|
854 |
"Modified: / 27.10.1997 / 22:42:31 / cg" |
708 | 855 |
! |
856 |
||
710 | 857 |
writeBitDataFor: image |
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
858 |
"using modified Lempel-Ziv Welch algorithm." |
710 | 859 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
860 |
| bits bitsPerPixel t1 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
861 |
maxBits maxMaxCode tSize initCodeSize ent tShift fCode pixel index disp nomatch | |
710 | 862 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
863 |
outStream nextPut:ImageSeparator. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
864 |
self writeShort:0. "/ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
865 |
self writeShort:0. "/ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
866 |
self writeShort:width. "/ image size |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
867 |
self writeShort:height. |
714 | 868 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
869 |
interlace == true ifTrue:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
870 |
t1 := 64 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
871 |
] ifFalse:[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
872 |
t1 := 0 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
873 |
]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
874 |
outStream nextPut:t1. "/ another flag |
714 | 875 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
876 |
bitsPerPixel := image bitsPerPixel. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
877 |
bits := image bits. |
710 | 878 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
879 |
pass := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
880 |
xpos := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
881 |
ypos := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
882 |
rowByteSize := image bytesPerRow. "/ width * 8 + 31 // 32 * 4. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
883 |
remainBitCount := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
884 |
bufByte := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
885 |
bufStream := WriteStream on: (ByteArray new: 256). |
708 | 886 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
887 |
maxBits := 12. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
888 |
maxMaxCode := 1 bitShift: maxBits. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
889 |
tSize := 5003. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
890 |
prefixTable := Array new: tSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
891 |
suffixTable := Array new: tSize. |
710 | 892 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
893 |
initCodeSize := bitsPerPixel <= 1 ifTrue: [2] ifFalse: [bitsPerPixel]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
894 |
outStream nextPut: initCodeSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
895 |
self setParameters: initCodeSize. |
710 | 896 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
897 |
tShift := 0. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
898 |
fCode := tSize. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
899 |
[fCode < 65536] whileTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
900 |
[tShift := tShift + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
901 |
fCode := fCode * 2]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
902 |
tShift := 8 - tShift. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
903 |
1 to: tSize do: [:i | suffixTable at: i put: -1]. |
708 | 904 |
|
1206
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
905 |
self writeCodeAndCheckCodeSize: clearCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
906 |
ent := self readPixelFrom: bits. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
907 |
[(pixel := self readPixelFrom: bits) == nil] whileFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
908 |
[ |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
909 |
fCode := (pixel bitShift: maxBits) + ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
910 |
index := ((pixel bitShift: tShift) bitXor: ent) + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
911 |
(suffixTable at: index) = fCode |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
912 |
ifTrue: [ent := prefixTable at: index] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
913 |
ifFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
914 |
[nomatch := true. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
915 |
(suffixTable at: index) >= 0 |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
916 |
ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
917 |
[disp := tSize - index + 1. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
918 |
index = 1 ifTrue: [disp := 1]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
919 |
"probe" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
920 |
[(index := index - disp) < 1 ifTrue: [index := index + tSize]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
921 |
(suffixTable at: index) = fCode |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
922 |
ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
923 |
[ent := prefixTable at: index. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
924 |
nomatch := false. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
925 |
"continue whileFalse:"]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
926 |
nomatch and: [(suffixTable at: index) > 0]] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
927 |
whileTrue: ["probe"]]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
928 |
"nomatch" |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
929 |
nomatch ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
930 |
[self writeCodeAndCheckCodeSize: ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
931 |
ent := pixel. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
932 |
freeCode < maxMaxCode |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
933 |
ifTrue: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
934 |
[prefixTable at: index put: freeCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
935 |
suffixTable at: index put: fCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
936 |
freeCode := freeCode + 1] |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
937 |
ifFalse: |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
938 |
[self writeCodeAndCheckCodeSize: clearCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
939 |
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
|
940 |
self setParameters: initCodeSize]]]]. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
941 |
prefixTable := suffixTable := nil. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
942 |
self writeCodeAndCheckCodeSize: ent. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
943 |
self writeCodeAndCheckCodeSize: eoiCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
944 |
self flushCode. |
fe2354feee01
separated image writer for stream writing
Claus Gittinger <cg@exept.de>
parents:
1052
diff
changeset
|
945 |
outStream nextPut: 0. "zero-length packet" |
710 | 946 |
|
712 | 947 |
"Modified: 15.10.1997 / 19:56:28 / cg" |
708 | 948 |
! |
949 |
||
950 |
writeHeaderFor:image |
|
714 | 951 |
"write the gif header" |
708 | 952 |
|
953 |
|bitsPerPixel t1 n| |
|
954 |
||
955 |
bitsPerPixel := image bitsPerPixel. |
|
956 |
||
732 | 957 |
outStream nextPutAll: 'GIF89a' asByteArray. |
712 | 958 |
self writeShort:width. "/ screen size |
959 |
self writeShort:height. |
|
708 | 960 |
t1 := 128. |
712 | 961 |
t1 := t1 bitOr:(bitsPerPixel - 1 bitShift:5). |
962 |
t1 := t1 bitOr:(bitsPerPixel - 1). |
|
963 |
outStream nextPut:t1. "/ flag |
|
964 |
outStream nextPut:0. "/ background (not used) |
|
965 |
outStream nextPut:0. "/ aspect ratio |
|
708 | 966 |
|
713 | 967 |
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
|
968 |
|clr red green blue| |
712 | 969 |
|
757
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
970 |
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
|
971 |
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
|
972 |
"/ 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
|
973 |
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
|
974 |
] ifFalse:[ |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
975 |
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
|
976 |
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
|
977 |
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
|
978 |
]. |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
979 |
outStream |
094c6c7c4ce6
extracted raw image reading (i.e. after header & extensions have been read)
Claus Gittinger <cg@exept.de>
parents:
755
diff
changeset
|
980 |
nextPut:red; nextPut:green; nextPut:blue. |
713 | 981 |
]. |
982 |
"/ n := 0. |
|
983 |
"/ image colorMap notNil ifTrue:[ |
|
984 |
"/ image colorMap do:[:clr | |
|
985 |
"/ |red green blue| |
|
986 |
"/ |
|
987 |
"/ clr isNil ifTrue:[ |
|
988 |
"/ "/ unused colorMap slot |
|
989 |
"/ red := green := blue := 0. |
|
990 |
"/ ] ifFalse:[ |
|
991 |
"/ red := (clr redByte). |
|
992 |
"/ green := (clr greenByte). |
|
993 |
"/ blue := (clr blueByte). |
|
994 |
"/ ]. |
|
995 |
"/ outStream |
|
996 |
"/ nextPut:red; nextPut:green; nextPut:blue. |
|
997 |
"/ n := n + 1. |
|
998 |
"/ ] |
|
999 |
"/ ]. |
|
1000 |
"/ n+1 to:(1 bitShift:bitsPerPixel) do:[:i | |
|
1001 |
"/ outStream nextPut:0; nextPut:0; nextPut:0 |
|
1002 |
"/ ]. |
|
708 | 1003 |
|
732 | 1004 |
"Created: / 14.10.1997 / 17:41:28 / cg" |
1005 |
"Modified: / 31.10.1997 / 16:12:13 / cg" |
|
714 | 1006 |
! |
1007 |
||
1008 |
writeMaskExtensionHeaderFor:image |
|
1009 |
"write an extension header for the transparent pixel" |
|
1010 |
||
1011 |
outStream nextPut:Extension. |
|
1012 |
outStream nextPut:16rF9. "/ graphic control extension |
|
1013 |
outStream nextPut:4. "/ subBlockSize |
|
1014 |
||
1015 |
outStream nextPut:1. "/ animationType |
|
1016 |
outStream nextPutShort:1 MSB:false. "/ animationTime |
|
1017 |
outStream nextPut:maskPixel. "/ animationMask |
|
1018 |
||
1019 |
outStream nextPut:0. |
|
708 | 1020 |
! ! |
1021 |
||
339 | 1022 |
!GIFReader class methodsFor:'documentation'! |
135 | 1023 |
|
1024 |
version |
|
1745
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1739
diff
changeset
|
1025 |
^ '$Header: /cvs/stx/stx/libview2/GIFReader.st,v 1.81 2003-04-10 14:25:47 cg Exp $' |
135 | 1026 |
! ! |
1711
b3ba13167ee7
Handle openErrorSignal in preparition for change openErrorSignal
Stefan Vogel <sv@exept.de>
parents:
1521
diff
changeset
|
1027 |
|
43 | 1028 |
GIFReader initialize! |