| author | Claus Gittinger <cg@exept.de> |
| Sat, 27 Oct 2018 12:15:41 +0200 | |
| changeset 4203 | 6406f4c9a469 |
| parent 4181 | f0b8d41ff628 |
| child 4204 | b2461e684455 |
| permissions | -rw-r--r-- |
| 4203 | 1 |
"{ Encoding: utf8 }"
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" |
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COPYRIGHT (c) 1996 by Claus Gittinger |
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All Rights Reserved |
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||
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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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||
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"{ NameSpace: Smalltalk }"
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||
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ImageReader subclass:#PNGReader |
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instanceVariableNames:'colorType bitsPerChannel compressionMethod filterMethod |
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interlaceMode bytesPerScanline globalDataChunk thisScanline |
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prevScanline processTextChunks specialChunkHandlers |
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paletteAlphaEntries paletteIndexForMaskedPixels image forceRGB |
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depthImage specialChunks' |
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classVariableNames:'ColorTypeGray ColorTypeGrayAlpha ColorTypePalette ColorTypeRGB |
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ColorTypeRGBAlpha Verbose' |
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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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!PNGReader class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1996 by Claus Gittinger |
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All Rights Reserved |
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||
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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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documentation |
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" |
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This class provides methods for loading and saving PNG pictures. |
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It is currenty unfinished (some interlaced image formats are unsupported, for example: grayscale+alpha) |
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In the meantime, use a pngtoXXX converter for interlaced images, and read XXX. |
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|
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[caveats:] |
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writer can only store mask with depth24 images (for now). |
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writer only generates unfiltered non-interlaced data. |
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[Special:] |
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the EnforcedImageTypeQuery is asked for; |
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if #rgb is returned AND the image is rgba, then the alpha channel is ignored |
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and an rgb (Depth24Image) is returned instead. |
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Proprietary chunks can be extracted by defining a specialChunkHandler, |
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which is invoked (indexed by chunkType) with the chunk data when such a |
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chunk is encountered. This allows for private data to be extracted. |
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(labview does this, and expecco can do this) |
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Proprietary chunks can be written by setting the specialChunks collection |
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before writing. |
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[See also:] |
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Image Form Icon |
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| 4104 | 72 |
BlitImageReader FaceReader GIFReader JPEGReader MacOSXIconReader |
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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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examples |
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" |
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PNGReader fromFile:'/home/cg/AudioExplorer_51_files/use_small.png' |
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PNGReader fromFile:'\\Exeptn\tmp\images\expeccoScreenshot4020_5526507.png' |
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PNGReader fromFile:'C:\Users\cg\Desktop\croquet\cobalt-base-current-build-20090210\cobalt-base-current-build-20090210\content\models\textures\checkerboard.png' |
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PNGReader fromFile:'C:\Dokumente und Einstellungen\cg\Desktop\misc\PNGs\Delete.png' |
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2697
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
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PNGReader fromFile:'\\exeptn\unsaved\pd_stuff\PNGs\Delete.png' |
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PNGReader fromFile:'\\exeptn\unsaved\pd_stuff\PNGs\Down.png' |
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|img img2 outStream png| |
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img := ToolbarIconLibrary error32x32Icon. |
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outStream := WriteStream on:(ByteArray new:100). |
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PNGReader save:img onStream:outStream. |
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png := outStream contents. |
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img2 := PNGReader fromStream:(png readStream). |
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self assert:(img bits = img2 bits). |
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img inspect. |
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img2 inspect. |
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" |
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! ! |
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||
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!PNGReader class methodsFor:'initialization'! |
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initialize |
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"install myself in the Image classes fileFormat table for the `.png' extension." |
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MIMETypes defineImageType:'image/png' suffix:'png' reader:self. |
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"/ backward compatibility from times when png was not yet so common... |
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MIMETypes defineImageType:'image/x-png' suffix:nil reader:self. |
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ColorTypeGray := 0. |
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ColorTypeRGB := 2. |
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ColorTypePalette := 3. |
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ColorTypeGrayAlpha := 4. |
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ColorTypeRGBAlpha := 6. |
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"Modified: / 16-02-2017 / 19:41:40 / cg" |
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! ! |
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!PNGReader class methodsFor:'accessing'! |
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pngHeader |
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^ #[137 80 78 71 13 10 26 10] |
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! ! |
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!PNGReader class methodsFor:'queries'! |
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canRepresent:anImage |
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"return true, if anImage can be represented in my file format. |
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Any image without mask is supported; |
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only depth24 images with mask are (currently)." |
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anImage mask notNil ifTrue:[ |
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"/ for now, can only write depth24 images with mask |
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^ anImage depth == 24 |
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]. |
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^ true |
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"Modified (comment): / 16-02-2017 / 16:28:53 / cg" |
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! ! |
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||
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!PNGReader class methodsFor:'testing'! |
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isValidImageFile:aFileName |
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"return true, if aFileName contains a PNG image" |
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|inStream magic| |
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inStream := self streamReadingFile:aFileName. |
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inStream isNil ifTrue:[^ false]. |
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inStream binary. |
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magic := ByteArray new:8. |
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inStream nextBytes:8 into:magic. |
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inStream close. |
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^ (magic = #[137 80 78 71 13 10 26 10]) |
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" |
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self isValidImageFile:'/home/cg/AudioExplorer_51_files/use_small.png' |
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self isValidImageFile:'C:\Users\cg\Desktop\croquet\cobalt-base-current-build-20090210\cobalt-base-current-build-20090210\content\models\textures\checkerboard.png' |
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self isValidImageFile:'C:\Dokumente und Einstellungen\cg\Desktop\misc\PNGs\Delete.png' |
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" |
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"Modified: 21.6.1996 / 20:38:46 / cg" |
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! ! |
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!PNGReader methodsFor:'accessing'! |
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makeImage |
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image isNil ifTrue:[ |
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image := super makeImage. |
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]. |
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^ image |
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"Created: / 17-02-2017 / 11:14:45 / cg" |
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! |
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pngHeader |
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<resource: #obsolete> |
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^ self class pngHeader |
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"Modified: / 22-02-2017 / 11:00:44 / cg" |
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! ! |
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!PNGReader methodsFor:'hooks'! |
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specialChunkHandlerAt:chunkType put:aHandlerBlock |
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"define a handler action, which processes unknown chunks. |
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The handler block will be called with one or two arguments: |
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the binary data of the chunk, and optionally the reader itself" |
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specialChunkHandlers isNil ifTrue:[ |
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specialChunkHandlers := Dictionary new |
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]. |
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specialChunkHandlers at:chunkType put:aHandlerBlock |
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"Created: / 14-02-2017 / 11:43:33 / cg" |
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! ! |
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!PNGReader methodsFor:'reading'! |
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fromStream:aStream |
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"read a stream containing a PNG image. |
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Leave the image description in instance variables |
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(i.e. to get the image, ask with image)." |
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||
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|header bitsPerSampleOut bytesPerScanlineOut| |
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inStream := aStream. |
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aStream binary. |
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"PNG-files are always msb (network-world)" |
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byteOrder := #msb. |
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header := ByteArray new:8. |
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aStream nextBytes:8 into:header. |
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header = (self class pngHeader) ifFalse:[ |
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Logger warning:'PNGReader: not a png file (%1)' with:aStream. |
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Image badImageFormatQuerySignal raiseRequestErrorString:'PNGReader: not a png file'. |
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^ nil |
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]. |
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(self getIHDRChunk) ifFalse:[ |
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Logger warning:'PNGReader: required IHDR chunk missing (%1)' with:aStream. |
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Image badImageFormatQuerySignal raiseRequestErrorString:'PNGReader: required IHDR chunk missing'. |
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^ nil |
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]. |
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compressionMethod ~~ 0 ifTrue:[ |
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('PNGReader: compressionMethod %s not supported.' printfWith:compressionMethod printString) infoPrintCR.
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Image badImageFormatQuerySignal raiseRequestErrorString:'PNGReader: unsupported compression method'. |
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^ nil |
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]. |
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filterMethod > 0 ifTrue:[ |
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'PNGReader: invalid filterMethod' infoPrintCR. |
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Image badImageFormatQuerySignal raiseRequestErrorString:'PNGReader: invalid/unsupported filterMethod'. |
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^ nil. |
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]. |
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interlaceMode > 1 ifTrue:[ |
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Image badImageFormatQuerySignal raiseRequestErrorString:'PNGReader: invalid/unsupported interlaceMode'. |
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'PNGReader: invalid interlaceMode' infoPrintCR. |
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^ nil. |
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]. |
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(self setColorType:colorType) ifFalse:[ |
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^ nil |
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]. |
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[self getChunk] whileTrue. |
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"/ kludge: if we get a grey image with alpha, |
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"/ load as rgb+alpha |
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forceRGB := false. |
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depthImage := depth. |
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"/ bytesPerScanline is always the in-bytesPerScanline |
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bytesPerScanline := self bytesPerRow. |
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bytesPerScanlineOut := bytesPerScanline. |
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||
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samplesPerPixel == 2 ifTrue:[ |
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photometric == #blackIs0 ifTrue:[ |
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depth == 16 ifTrue:[ |
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"/ force grey8+a8 into red8+green8+blue8+a8 |
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forceRGB := true. |
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depthImage := 32. |
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bytesPerScanlineOut := width * 4. |
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bitsPerSampleOut := #[8 8 8 8]. |
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] ifFalse:[ |
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depth == 32 ifTrue:[ |
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"/ force grey16+a16 into red8+green8+blue8+a8 |
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forceRGB := true. |
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depthImage := 32. |
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bytesPerScanlineOut := width * 4. |
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bitsPerSampleOut := #[8 8 8 8]. |
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] ifFalse:[ |
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self error:'unsupported grayscale image depth'. |
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]. |
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]. |
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]. |
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]. |
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data := ByteArray new:(bytesPerScanlineOut * height). |
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||
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globalDataChunk notNil ifTrue:[ |
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self processGlobalIDATChunk. |
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globalDataChunk := nil. |
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]. |
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photometric == #palette ifTrue:[ |
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colorMap isNil ifTrue:[ |
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Image badImageFormatQuerySignal raiseRequestErrorString:'PNGReader: palette chunk missing'. |
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'PNGReader: palette chunk missing.' infoPrintCR. |
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"/ ^ nil |
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]. |
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]. |
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||
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paletteAlphaEntries notNil ifTrue:[ |
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"/ this vector now provides alpha values. |
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"/ for now, we can only deal with 0/255 alpha values... |
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self generateMaskFromPaletteAlphaEntries |
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]. |
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||
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forceRGB ifTrue:[ |
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depth := depthImage. |
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photometric := #rgba. |
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bitsPerSample := bitsPerSampleOut. |
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samplesPerPixel := 4. |
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]. |
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||
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" |
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PNGReader fromFile:'/home/cg/libpng-0.89c/pngtest.png' |
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Verbose := true. |
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PNGReader fromFile:(RegressionTests::ImageReaderTest packageDirectory construct:'testData/pngImages/tbbn3p08.png') |
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||
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" |
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||
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"Modified: / 17-09-2017 / 15:30:45 / cg" |
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"Modified (format): / 02-06-2018 / 06:55:59 / Claus Gittinger" |
| 3900 | 326 |
! ! |
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!PNGReader methodsFor:'reading-private'! |
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generateMaskFromPaletteAlphaEntries |
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image isNil ifTrue:[ |
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self makeImage |
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]. |
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||
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colorType == ColorTypePalette ifTrue:[ |
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image depth == 8 ifTrue:[ |
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"/ if there is only one entry to care for... |
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(paletteAlphaEntries occurrencesOf:0) == 1 ifTrue:[ |
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(paletteAlphaEntries conform:[:alpha | (alpha == 0) or:[alpha == 255]]) ifTrue:[ |
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image mask:(self class |
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buildMaskFromColor:(paletteAlphaEntries indexOf:0)-1 |
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for:data depth:(image depth) |
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width:width height:height). |
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^ self |
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]. |
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| 3900 | 346 |
]. |
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]. |
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||
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"/ multiple masked pixels... |
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paletteAlphaEntries keysAndValuesDo:[:pixelIndex :alpha | |
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alpha == 255 ifTrue:[ |
| 3900 | 352 |
image createMaskForPixelValue:pixelIndex |
353 |
] ifFalse:[ |
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| 3972 | 354 |
alpha == 0 ifTrue:[ |
| 3900 | 355 |
"/ ok; already |
356 |
] ifFalse:[ |
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image createMaskForPixelValue:pixelIndex |
| 3900 | 358 |
] |
359 |
]. |
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]. |
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"/ image mask:nil. |
| 3900 | 362 |
^ self. |
363 |
]. |
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||
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colorType == ColorTypeGray ifTrue:[ |
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|maskPixel| |
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||
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maskPixel := paletteAlphaEntries unsignedInt16At:1 MSB:true. |
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image createMaskForPixelValue:maskPixel. |
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^ self |
|
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]. |
|
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colorType == ColorTypeRGB ifTrue:[ |
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|mr mg mb maskPixel| |
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||
375 |
mr := paletteAlphaEntries unsignedInt16At:1 MSB:true. |
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mg := paletteAlphaEntries unsignedInt16At:3 MSB:true. |
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mb := paletteAlphaEntries unsignedInt16At:5 MSB:true. |
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depth <= 32 ifTrue:[ |
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"/ only use the low bits... |
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mr > 255 ifTrue:[ self error:'only 8bit RGB supported']. |
|
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mg > 255 ifTrue:[ self error:'only 8bit RGB supported']. |
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mb > 255 ifTrue:[ self error:'only 8bit RGB supported']. |
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maskPixel := ((mr bitShift:16) bitOr:(mg bitShift:8)) bitOr:mb. |
|
384 |
] ifFalse:[ |
|
385 |
maskPixel := ((mr bitShift:32) bitOr:(mg bitShift:16)) bitOr:mb. |
|
386 |
]. |
|
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image createMaskForPixelValue:maskPixel. |
|
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^ self |
|
389 |
]. |
|
390 |
||
391 |
"Created: / 17-02-2017 / 08:07:04 / cg" |
|
| 3972 | 392 |
"Modified: / 23-08-2017 / 17:24:30 / cg" |
| 3900 | 393 |
! |
394 |
||
395 |
getChunk |
|
396 |
|len type crc| |
|
397 |
||
398 |
inStream atEnd ifTrue:[^ false]. |
|
399 |
||
400 |
len := inStream nextInt32MSB:true. |
|
401 |
type := String new:4. |
|
402 |
(inStream nextBytes:4 into:type) ~~ 4 ifTrue:[^ false]. |
|
403 |
||
404 |
Verbose == true ifTrue:[ |
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| 4099 | 405 |
'PNGReader: chunk: ' infoPrint. type infoPrint. |
406 |
' len: ' infoPrint. len infoPrintCR. |
|
| 3900 | 407 |
]. |
408 |
||
409 |
type = 'IEND' ifTrue:[^ false]. |
|
410 |
||
411 |
(self processChunk:type len:len) ifFalse:[^ false]. |
|
412 |
||
413 |
crc := inStream nextInt32MSB:true. "/ ignored - for now |
|
414 |
^ true |
|
415 |
||
| 4099 | 416 |
"Created: / 21-06-1996 / 21:09:36 / cg" |
417 |
"Modified: / 02-06-2018 / 06:42:58 / Claus Gittinger" |
|
| 3900 | 418 |
! |
419 |
||
420 |
getIHDRChunk |
|
421 |
|len type crc| |
|
422 |
||
423 |
len := inStream nextInt32MSB:true. |
|
424 |
||
425 |
type := String new:4. |
|
426 |
inStream nextBytes:4 into:type. |
|
427 |
||
428 |
type = 'IHDR' ifFalse:[ |
|
429 |
Logger warning:'PNGReader: expected IHDR magic (%1)' with:inStream. |
|
430 |
^ false |
|
431 |
]. |
|
432 |
len == 13 ifFalse:[ |
|
433 |
Logger warning:'PNGReader: bad IHDR size (%1)' with:inStream. |
|
434 |
^ false |
|
435 |
]. |
|
436 |
||
437 |
width := inStream nextInt32MSB:true. |
|
438 |
height := inStream nextInt32MSB:true. |
|
439 |
||
440 |
(width <= 0 or:[height <= 0]) ifTrue:[ |
|
441 |
Logger warning:'PNGReader: invalid dimension(s) (%1)' with:inStream. |
|
442 |
^ false. |
|
443 |
]. |
|
444 |
self reportDimension. |
|
445 |
||
446 |
bitsPerChannel := inStream nextByte. |
|
| 4005 | 447 |
depth := bitsPerChannel. "/ for now - might be changed by setColorType. |
| 3900 | 448 |
colorType := inStream nextByte. |
449 |
||
450 |
compressionMethod := inStream nextByte. |
|
451 |
filterMethod := inStream nextByte. |
|
452 |
interlaceMode := inStream nextByte. |
|
453 |
||
454 |
Verbose == true ifTrue:[ |
|
455 |
'PNGReader: IHDR:' infoPrintCR. |
|
456 |
'PNGReader: width: ' infoPrint. width infoPrintCR. |
|
457 |
'PNGReader: height: ' infoPrint. height infoPrintCR. |
|
458 |
'PNGReader: bitsPerChannel: ' infoPrint. bitsPerChannel infoPrintCR. |
|
459 |
'PNGReader: colorType: ' infoPrint. colorType infoPrintCR. |
|
460 |
'PNGReader: compressionMethod: ' infoPrint. compressionMethod infoPrintCR. |
|
461 |
'PNGReader: filterMethod: ' infoPrint. filterMethod infoPrintCR. |
|
462 |
'PNGReader: interlaceMode: ' infoPrint. interlaceMode infoPrintCR. |
|
463 |
]. |
|
464 |
||
465 |
crc := inStream nextInt32MSB:true. |
|
466 |
^ true |
|
467 |
||
468 |
"Modified: / 17-02-2017 / 11:35:20 / cg" |
|
| 4005 | 469 |
"Modified (comment): / 31-08-2017 / 18:03:41 / cg" |
| 3900 | 470 |
! |
471 |
||
472 |
handleText:text keyword:keyword |
|
473 |
"/ things like exif data etc. |
|
474 |
"/ self halt. |
|
475 |
||
476 |
"/Standard keywords for text chunks: |
|
477 |
"/ |
|
478 |
"/ Title Short (one line) title or caption for image |
|
479 |
"/ Author Name of image's creator |
|
480 |
"/ Description Description of image (possibly long) |
|
481 |
"/ Copyright Copyright notice |
|
482 |
"/ Creation Time Time of original image creation |
|
483 |
"/ Software Software used to create the image |
|
484 |
"/ Disclaimer Legal disclaimer |
|
485 |
"/ Warning Warning of nature of content |
|
486 |
"/ Source Device used to create the image |
|
487 |
"/ Comment Miscellaneous comment; conversion from |
|
488 |
"/ GIF comment |
|
489 |
! |
|
490 |
||
491 |
setColorType:colorType |
|
| 4005 | 492 |
colorType == ColorTypeGray "0" ifTrue:[ |
| 3900 | 493 |
photometric := #blackIs0. |
494 |
samplesPerPixel := 1. |
|
495 |
bitsPerSample := Array with:bitsPerChannel. |
|
496 |
depth := bitsPerChannel. |
|
497 |
^ true. |
|
498 |
]. |
|
499 |
||
| 4005 | 500 |
colorType == ColorTypeRGB "2" ifTrue:[ |
| 3900 | 501 |
photometric := #rgb. |
502 |
samplesPerPixel := 3. |
|
503 |
bitsPerSample := Array with:bitsPerChannel with:bitsPerChannel with:bitsPerChannel. |
|
504 |
depth := bitsPerChannel * 3. |
|
| 4005 | 505 |
|
506 |
bitsPerChannel < 8 ifTrue:[ |
|
507 |
bitsPerChannel == 5 ifTrue:[ |
|
508 |
depth := 16 |
|
509 |
] ifFalse:[ |
|
510 |
('PNGReader: unsupported bitsPerChannel:%1 for colorType rgb' bindWith:bitsPerChannel) infoPrintCR.
|
|
511 |
]. |
|
512 |
]. |
|
| 3900 | 513 |
^ true. |
514 |
]. |
|
515 |
||
| 4005 | 516 |
colorType == ColorTypePalette "3" ifTrue:[ |
| 3900 | 517 |
bitsPerChannel == 16 ifTrue:[ |
| 4005 | 518 |
'PNGReader: invalid unsupported bitsPerChannel:%1 for colorType palette' infoPrintCR. |
| 3900 | 519 |
^ false. |
520 |
]. |
|
521 |
photometric := #palette. |
|
522 |
samplesPerPixel := 1. |
|
523 |
bitsPerSample := Array with:bitsPerChannel. |
|
524 |
depth := bitsPerChannel. |
|
525 |
^ true. |
|
526 |
]. |
|
527 |
||
| 4005 | 528 |
colorType == ColorTypeGrayAlpha "4" ifTrue:[ |
| 3900 | 529 |
bitsPerChannel < 8 ifTrue:[ |
| 4005 | 530 |
'PNGReader: unsupported colorType/depth combination' infoPrintCR. |
| 3900 | 531 |
^ false. |
532 |
]. |
|
533 |
photometric := #blackIs0. |
|
534 |
samplesPerPixel := 2. |
|
535 |
bitsPerSample := Array with:bitsPerChannel with:bitsPerChannel. |
|
536 |
depth := bitsPerChannel * 2. |
|
537 |
^ true. |
|
538 |
]. |
|
539 |
||
| 4005 | 540 |
colorType == ColorTypeRGBAlpha "6" ifTrue:[ |
| 3900 | 541 |
bitsPerChannel < 8 ifTrue:[ |
| 4005 | 542 |
'PNGReader: unsupported colorType/depth combination' infoPrintCR. |
| 3900 | 543 |
^ false. |
544 |
]. |
|
545 |
photometric := #rgba. |
|
| 4044 | 546 |
ImageReader::EnforcedImageTypeQuery query == #rgb ifTrue:[ |
547 |
photometric := #rgb |
|
548 |
]. |
|
| 3900 | 549 |
samplesPerPixel := 4. |
550 |
bitsPerSample := Array with:bitsPerChannel with:bitsPerChannel with:bitsPerChannel with:bitsPerChannel. |
|
551 |
depth := bitsPerChannel * 4. |
|
552 |
^ true. |
|
553 |
]. |
|
554 |
||
| 4005 | 555 |
('PNGReader: unsupported or invalid colorType: ' , colorType printString , '.') infoPrintCR.
|
| 3900 | 556 |
^ false |
557 |
||
| 4005 | 558 |
"Modified: / 31-08-2017 / 17:58:18 / cg" |
| 3900 | 559 |
! ! |
560 |
||
561 |
!PNGReader methodsFor:'reading-private chunks'! |
|
| 308 | 562 |
|
| 2699 | 563 |
doPass: pass |
564 |
"Certain interlace passes are skipped with certain small image dimensions" |
|
565 |
||
566 |
pass = 1 ifTrue: [ ^ true ]. |
|
567 |
((width = 1) and: [height = 1]) ifTrue: [ ^ false ]. |
|
568 |
pass = 2 ifTrue: [ ^ width >= 5 ]. |
|
569 |
pass = 3 ifTrue: [ ^ height >= 5 ]. |
|
570 |
pass = 4 ifTrue: [ ^ (width >=3 ) or: [height >= 5] ]. |
|
571 |
pass = 5 ifTrue: [ ^ height >=3 ]. |
|
572 |
pass = 6 ifTrue: [ ^ width >=2 ]. |
|
573 |
pass = 7 ifTrue: [ ^ height >=2 ]. |
|
574 |
||
575 |
self error:'invalid argument'. |
|
576 |
^ true |
|
577 |
! |
|
578 |
||
| 308 | 579 |
processBKGDChunkLen:len |
580 |
inStream skip:len. |
|
581 |
^ true |
|
582 |
||
583 |
"Created: 21.6.1996 / 21:15:49 / cg" |
|
584 |
! |
|
585 |
||
| 2707 | 586 |
processCHRMChunkLen:len |
587 |
"cHRM Primary chromaticities chunk - currently unhandled" |
|
588 |
||
589 |
|whitePointX whitePointY redX redY greenX greenY blueX blueY| |
|
590 |
||
| 3554 | 591 |
whitePointX := (inStream nextInt32MSB:true) / 100000.0. |
592 |
whitePointY := (inStream nextInt32MSB:true) / 100000.0. |
|
593 |
redX := (inStream nextInt32MSB:true) / 100000.0. |
|
594 |
redY := (inStream nextInt32MSB:true) / 100000.0. |
|
595 |
greenX := (inStream nextInt32MSB:true) / 100000.0. |
|
596 |
greenY := (inStream nextInt32MSB:true) / 100000.0. |
|
597 |
blueX := (inStream nextInt32MSB:true) / 100000.0. |
|
598 |
blueY := (inStream nextInt32MSB:true) / 100000.0. |
|
| 2707 | 599 |
|
600 |
Verbose == true ifTrue:[ |
|
601 |
'PNGReader: CHRM chunk ignored:' infoPrintCR. |
|
602 |
'PNGReader: whitePointX:' infoPrint. whitePointX infoPrintCR. |
|
603 |
'PNGReader: whitePointY:' infoPrint. whitePointX infoPrintCR. |
|
604 |
'PNGReader: redX:' infoPrint. redX infoPrintCR. |
|
605 |
'PNGReader: redY:' infoPrint. redY infoPrintCR. |
|
606 |
'PNGReader: greenX:' infoPrint. greenX infoPrintCR. |
|
607 |
'PNGReader: greenY:' infoPrint. greenY infoPrintCR. |
|
608 |
'PNGReader: blueX:' infoPrint. blueX infoPrintCR. |
|
609 |
'PNGReader: blueY:' infoPrint. blueY infoPrintCR. |
|
610 |
]. |
|
611 |
^ true |
|
612 |
! |
|
613 |
||
| 308 | 614 |
processChunk:type len:len |
| 2509 | 615 |
|chunk| |
616 |
||
617 |
type = 'IDAT' ifTrue:[ |
|
618 |
"---since the compressed data can span multiple |
|
619 |
chunks, stitch them all together first. later, |
|
620 |
if memory is an issue, we need to figure out how |
|
621 |
to do this on the fly---" |
|
622 |
chunk := inStream next:len. |
|
| 3821 | 623 |
globalDataChunk isNil ifTrue:[ |
624 |
globalDataChunk := ReadWriteStream on:(ByteArray new:(height * self bytesPerRow)). |
|
625 |
]. |
|
626 |
globalDataChunk nextPutAll:chunk. |
|
| 2509 | 627 |
^ true |
628 |
]. |
|
629 |
||
| 308 | 630 |
type = 'gAMA' ifTrue:[^ self processGAMAChunkLen:len]. |
631 |
type = 'sBIT' ifTrue:[^ self processSBITChunkLen:len]. |
|
632 |
type = 'tEXt' ifTrue:[^ self processTEXTChunkLen:len]. |
|
633 |
type = 'tIME' ifTrue:[^ self processTIMEChunkLen:len]. |
|
634 |
type = 'bKGD' ifTrue:[^ self processBKGDChunkLen:len]. |
|
635 |
type = 'zTXt' ifTrue:[^ self processZTXTChunkLen:len]. |
|
636 |
type = 'PLTE' ifTrue:[^ self processPLTEChunkLen:len]. |
|
637 |
||
| 1671 | 638 |
type = 'pHYs' ifTrue:[^ self processPHYSChunkLen:len]. |
| 2707 | 639 |
type = 'cHRM' ifTrue:[^ self processCHRMChunkLen:len]. |
| 1671 | 640 |
type = 'tRNS' ifTrue:[^ self processTRNSChunkLen:len]. |
641 |
type = 'IHDR' ifTrue:[^ self processIHDRChunkLen:len]. |
|
642 |
||
| 3762 | 643 |
type = 'iTXt' ifTrue:[^ self processITXTChunkLen:len]. |
644 |
type = 'iCCP' ifTrue:[^ self processICCPChunkLen:len]. |
|
| 3900 | 645 |
type = 'hIST' ifTrue:[^ self processHISTChunkLen:len]. |
646 |
type = 'spAL' ifTrue:[^ self processSPALChunkLen:len]. |
|
| 3889 | 647 |
|
648 |
specialChunkHandlers notNil ifTrue:[ |
|
649 |
|handler chunkData| |
|
650 |
||
651 |
handler := specialChunkHandlers at:type ifAbsent:nil. |
|
652 |
handler notNil ifTrue:[ |
|
653 |
chunkData := inStream nextBytes:len. |
|
654 |
handler value:chunkData optionalArgument:self. |
|
655 |
^ true. |
|
656 |
]. |
|
657 |
]. |
|
658 |
||
| 3891 | 659 |
type = 'niVI' ifTrue:[^ self processNIVIChunkLen:len]. |
| 3950 | 660 |
type = 'exEX' ifTrue:[^ self processEXEXChunkLen:len]. |
| 3891 | 661 |
|
| 308 | 662 |
('PNGReader: unrecognized chunk: ' , type , ' ignored.') infoPrintCR.
|
663 |
||
664 |
inStream skip:len. |
|
665 |
^ true. |
|
666 |
||
| 3889 | 667 |
"Created: / 21-06-1996 / 21:10:37 / cg" |
| 3950 | 668 |
"Modified: / 11-04-2017 / 17:04:12 / cg" |
| 4099 | 669 |
"Modified: / 02-06-2018 / 06:43:03 / Claus Gittinger" |
| 3950 | 670 |
! |
671 |
||
672 |
processEXEXChunkLen:len |
|
673 |
"/ this cunk contains an expecco sample network. |
|
674 |
"/ ...to read it (using the expecco importer), |
|
675 |
"/ create a reader with a chunkHook and extract it there. |
|
676 |
Logger info:('PNG: skip exEX chunk').
|
|
677 |
inStream skip:len. |
|
678 |
^ true. |
|
679 |
||
680 |
"Created: / 11-04-2017 / 17:06:27 / cg" |
|
| 308 | 681 |
! |
682 |
||
683 |
processGAMAChunkLen:len |
|
684 |
inStream skip:len. |
|
685 |
^ true |
|
686 |
||
687 |
"Created: 21.6.1996 / 21:10:52 / cg" |
|
688 |
! |
|
689 |
||
| 2509 | 690 |
processGlobalIDATChunk |
691 |
interlaceMode == 0 ifTrue: [ |
|
692 |
^ self processNonInterlacedGlobalDATA |
|
693 |
]. |
|
694 |
^ self processInterlacedGlobalDATA |
|
695 |
! |
|
696 |
||
| 3900 | 697 |
processHISTChunkLen:len |
698 |
"/ ignored |
|
699 |
"/ inStream nextBytes:len. |
|
700 |
||
701 |
inStream skip:len. |
|
702 |
^ true |
|
703 |
||
704 |
"Created: / 17-02-2017 / 11:31:36 / cg" |
|
705 |
! |
|
706 |
||
| 3762 | 707 |
processICCPChunkLen:len |
708 |
"/ ignored |
|
709 |
"/ inStream nextBytes:len. |
|
710 |
||
711 |
inStream skip:len. |
|
712 |
^ true |
|
713 |
||
714 |
"Created: 21.6.1996 / 21:15:58 / cg" |
|
715 |
! |
|
716 |
||
| 308 | 717 |
processIDATChunkLen:len |
| 1671 | 718 |
interlaceMode == 0 ifTrue: [ |
719 |
^ self processNonInterlacedDATA:len |
|
720 |
]. |
|
721 |
^ self processInterlacedDATA:len |
|
722 |
! |
|
723 |
||
| 3762 | 724 |
processIHDRChunkLen:len |
725 |
"/ ignored |
|
726 |
||
727 |
inStream skip:len. |
|
728 |
^ true |
|
729 |
||
730 |
"Created: 21.6.1996 / 21:15:58 / cg" |
|
731 |
! |
|
732 |
||
733 |
processITXTChunkLen:len |
|
734 |
"/ international (i.e.utf8) textual data. |
|
735 |
||
736 |
"/ currently ignored - not needed to display png images |
|
737 |
"/ |
|
738 |
"/ Keyword: 1-79 bytes (character string) |
|
739 |
"/ Null separator: 1 byte |
|
740 |
"/ Compression flag: 1 byte |
|
741 |
"/ Compression method: 1 byte |
|
742 |
"/ Language tag: 0 or more bytes (character string) |
|
743 |
"/ Null separator: 1 byte |
|
744 |
"/ Translated keyword: 0 or more bytes |
|
745 |
"/ Null separator: 1 byte |
|
746 |
"/ Text: 0 or more bytes |
|
747 |
||
748 |
"/ if needed, set processTextChunks to true somewhere... |
|
749 |
processTextChunks == true ifTrue:[ |
|
750 |
|chunkData keyword text i1 i2 i3 |
|
751 |
compressionFlag compressionMethod languageTag |
|
752 |
xlatedKeyword textBytes| |
|
753 |
||
754 |
chunkData := inStream nextBytes:len. |
|
755 |
i1 := chunkData indexOf:0. |
|
756 |
keyword := (chunkData copyTo:i1-1) asString. |
|
757 |
compressionFlag := chunkData at:i1+1. |
|
758 |
compressionMethod := chunkData at:i1+2. |
|
759 |
i2 := chunkData indexOf:0 startingAt:i1+3. |
|
760 |
languageTag := (chunkData copyFrom:i1+3 to:i2-1) asString. |
|
761 |
i3 := chunkData indexOf:0 startingAt:i2+1. |
|
762 |
xlatedKeyword := (chunkData copyFrom:i2+1 to:i3-1) asString. |
|
763 |
textBytes := chunkData copyFrom:i3+1. |
|
764 |
compressionFlag == 0 ifTrue:[ |
|
765 |
text := textBytes |
|
766 |
] ifFalse:[ |
|
767 |
compressionFlag == 1 ifTrue:[ |
|
768 |
"/ for now, only zlib compression is supported... |
|
| 3900 | 769 |
"/ ... no - not even that is |
770 |
Logger warning:'PNG: zlib compressed text currently unsupported'. |
|
| 3762 | 771 |
] ifFalse:[ |
| 3900 | 772 |
Logger warning:'PNG: unsupported text compression method'. |
| 3762 | 773 |
]. |
774 |
]. |
|
775 |
text := text utf8Decoded. |
|
776 |
self handleText:text keyword:keyword. |
|
777 |
] ifFalse:[ |
|
778 |
inStream skip:len. |
|
779 |
]. |
|
780 |
^ true |
|
781 |
||
| 3900 | 782 |
"Created: / 21-06-1996 / 21:15:58 / cg" |
783 |
"Modified: / 16-02-2017 / 19:51:21 / cg" |
|
| 3762 | 784 |
! |
785 |
||
| 1671 | 786 |
processInterlacedDATA:len |
| 4099 | 787 |
'PNGReader: skip unsupported interlaced data' infoPrintCR. |
788 |
||
| 308 | 789 |
inStream skip:len. |
790 |
^ true |
|
| 4099 | 791 |
|
792 |
"Modified: / 02-06-2018 / 06:40:22 / Claus Gittinger" |
|
| 1671 | 793 |
! |
| 308 | 794 |
|
| 2699 | 795 |
processInterlacedGlobalDATA |
| 3327 | 796 |
"adam7 interlace method" |
797 |
||
| 3612 | 798 |
| zlibReader filter |
799 |
bytesPerPass startingCol colIncrement rowIncrement |
|
800 |
startingRow |
|
801 |
temp "filtersSeen" |
|
802 |
cx "{ Class: SmallInteger }"
|
|
803 |
sc "{ Class: SmallInteger }"
|
|
804 |
cy "{ Class: SmallInteger }"
|
|
805 |
startRow "{ Class: SmallInteger }"
|
|
806 |
w "{ Class: SmallInteger }"
|
|
807 |
h "{ Class: SmallInteger }"
|
|
808 |
| |
|
| 2699 | 809 |
|
| 4099 | 810 |
Verbose == true ifTrue:[ |
811 |
'PNGReader: process interlaced global data' infoPrintCR. |
|
812 |
]. |
|
813 |
||
| 3327 | 814 |
interlaceMode == 1 ifFalse: [ |
815 |
self error:'unsupported interlaced mode'. |
|
816 |
^ self |
|
817 |
]. |
|
| 2699 | 818 |
|
819 |
"/ filtersSeen := Set new. |
|
820 |
||
821 |
startingCol := #(0 4 0 2 0 1 0 ). |
|
| 3327 | 822 |
startingRow := #(0 0 4 0 2 0 1 ). |
| 2699 | 823 |
colIncrement := #(8 8 4 4 2 2 1 ). |
824 |
rowIncrement := #(8 8 8 4 4 2 2 ). |
|
825 |
||
| 3821 | 826 |
globalDataChunk reset. |
827 |
zlibReader := ZipStream readOpenAsZipStreamOn:globalDataChunk suppressHeaderAndChecksum:false. |
|
| 2699 | 828 |
zlibReader binary. |
829 |
||
| 3612 | 830 |
h := height. |
831 |
w := width. |
|
| 2699 | 832 |
1 to: 7 do: [:pass | |
833 |
(self doPass: pass) ifTrue:[ |
|
834 |
cx := colIncrement at: pass. |
|
835 |
sc := startingCol at: pass. |
|
| 3327 | 836 |
cy := rowIncrement at: pass. |
| 3612 | 837 |
bytesPerPass := (((w - sc + cx - 1) // cx * depth) + 7) // 8. |
| 2699 | 838 |
prevScanline := ByteArray new: bytesPerPass. |
839 |
thisScanline := ByteArray new: bytesPerScanline. |
|
| 3612 | 840 |
startRow := startingRow at: pass. |
841 |
startRow to: h-1 by: cy do: [:y | |
|
| 3343 | 842 |
filter := zlibReader nextByte. |
| 2699 | 843 |
"/ filtersSeen add: filter. |
844 |
(filter isNil or: [(filter between: 0 and: 4) not]) |
|
845 |
ifTrue: [^ self]. |
|
846 |
zlibReader next: bytesPerPass into: thisScanline startingAt: 1. |
|
847 |
filter ~~ 0 ifTrue:[ self filterScanline: filter count: bytesPerPass ]. |
|
848 |
self copyPixels:y at:sc by:cx. |
|
849 |
temp := prevScanline. |
|
850 |
prevScanline := thisScanline. |
|
851 |
thisScanline := temp. |
|
852 |
] |
|
853 |
] |
|
854 |
]. |
|
855 |
zlibReader atEnd ifFalse:[self error:'Unexpected data']. |
|
| 2909 | 856 |
|
857 |
"Modified: / 03-05-2011 / 12:03:33 / cg" |
|
| 4099 | 858 |
"Modified: / 02-06-2018 / 06:43:26 / Claus Gittinger" |
| 2699 | 859 |
! |
860 |
||
| 3890 | 861 |
processNIVIChunkLen:len |
| 3889 | 862 |
"/ this cunk contains a labView vi. |
863 |
"/ ignored for now... |
|
| 3890 | 864 |
"/ ...to read it (using the expecco importer), |
865 |
"/ create a reader with a chunkHook and extract it there. |
|
| 3891 | 866 |
Logger info:('PNG: skip niVI chunk').
|
| 3890 | 867 |
inStream skip:len. |
868 |
^ true. |
|
| 3889 | 869 |
|
870 |
"Created: / 14-02-2017 / 08:57:29 / cg" |
|
| 3891 | 871 |
"Modified: / 14-02-2017 / 22:36:34 / cg" |
| 3889 | 872 |
! |
873 |
||
| 1671 | 874 |
processNonInterlacedDATA:len |
| 2701 | 875 |
self halt:'not used' |
876 |
"/ |
|
877 |
"/ | zlibReader filter temp prevScanline thisScanline bytesPerScanline filtersSeen| |
|
878 |
"/ |
|
879 |
"/ zlibReader := ZipStream readOpenAsZipStreamOn:inStream suppressHeaderAndChecksum:false. |
|
880 |
"/ "/ zlibReader := ZLibReadStream on:inStream from: 1 to:len. |
|
881 |
"/ |
|
882 |
"/ prevScanline := ByteArray new: self bytesPerRow. |
|
883 |
"/ thisScanline := ByteArray new: self bytesPerRow. |
|
884 |
"/ 0 to: height - 1 do:[:index | |
|
885 |
"/ filter := (zlibReader next: 1) first. |
|
886 |
"/ filtersSeen add: filter. |
|
887 |
"/ (filter isNil or: [(filter between: 0 and: 4) not]) ifTrue: [^self]. |
|
888 |
"/ thisScanline := zlibReader next: bytesPerScanline into: thisScanline startingAt: 1. |
|
889 |
"/ self filterScanline: filter count: bytesPerScanline. |
|
890 |
"/ self copyPixels: index. |
|
891 |
"/ temp := prevScanline. |
|
892 |
"/ prevScanline := thisScanline. |
|
893 |
"/ thisScanline := temp |
|
894 |
"/ ] |
|
| 2509 | 895 |
! |
896 |
||
897 |
processNonInterlacedGlobalDATA |
|
| 3821 | 898 |
| "data n" zlibReader filter temp "filtersSeen" i| |
| 2696 | 899 |
|
| 4099 | 900 |
Verbose == true ifTrue:[ |
901 |
'PNGReader: process non-interlaced global data' infoPrintCR. |
|
902 |
]. |
|
903 |
||
| 2696 | 904 |
"/ filtersSeen := Set new. |
| 2695 | 905 |
|
906 |
"/ data := ByteArray new:(self bytesPerRow * height)+1000. |
|
907 |
"/ n := ZipStream uncompress: globalDataChunk into: data. |
|
908 |
"/ self halt. |
|
| 2509 | 909 |
|
| 3821 | 910 |
globalDataChunk reset. |
911 |
zlibReader := ZipStream readOpenAsZipStreamOn:globalDataChunk suppressHeaderAndChecksum:false. |
|
| 2696 | 912 |
zlibReader binary. |
| 2509 | 913 |
|
| 1671 | 914 |
prevScanline := ByteArray new: bytesPerScanline. |
915 |
thisScanline := ByteArray new: bytesPerScanline. |
|
| 3972 | 916 |
0 to: height-1 do:[:y | |
| 3343 | 917 |
filter := zlibReader nextByte. |
| 3893 | 918 |
zlibReader next: bytesPerScanline into: thisScanline startingAt: 1. |
919 |
filter ~~ 0 ifTrue:[ |
|
920 |
"/ filtersSeen add: filter. |
|
921 |
(filter notNil and: [filter between: 0 and: 4]) ifFalse: [ |
|
922 |
'PNGReader: unsupported filter: ' infoPrint. filter infoPrintCR. |
|
923 |
^ self |
|
924 |
]. |
|
925 |
self filterScanline: filter count: bytesPerScanline |
|
| 2725 | 926 |
]. |
927 |
||
| 4099 | 928 |
forceRGB ifTrue:[ |
929 |
self copyPixels:y at:0 by:1. |
|
930 |
] ifFalse:[ |
|
931 |
i := y * bytesPerScanline. |
|
932 |
data replaceFrom:i+1 to:(i+bytesPerScanline) with:thisScanline startingAt:1. |
|
933 |
]. |
|
| 2695 | 934 |
temp := prevScanline. |
935 |
prevScanline := thisScanline. |
|
936 |
thisScanline := temp |
|
937 |
] |
|
| 3893 | 938 |
|
939 |
"Modified: / 16-02-2017 / 16:45:52 / cg" |
|
| 3972 | 940 |
"Modified (format): / 23-08-2017 / 17:05:01 / cg" |
| 4099 | 941 |
"Modified: / 02-06-2018 / 07:05:06 / Claus Gittinger" |
| 1671 | 942 |
! |
943 |
||
944 |
processPHYSChunkLen:len |
|
945 |
"physical pixel chunk - currently unhandled" |
|
946 |
||
| 2705 | 947 |
|pixelPerUnitX pixelPerUnitY unit| |
948 |
||
| 3554 | 949 |
pixelPerUnitX := inStream nextInt32MSB:true. |
950 |
pixelPerUnitY := inStream nextInt32MSB:true. |
|
| 2705 | 951 |
unit := inStream nextByte. |
952 |
||
| 2707 | 953 |
Verbose == true ifTrue:[ |
954 |
'PNGReader: PHYS chunk ignored:' infoPrintCR. |
|
955 |
'PNGReader: ppuX:' infoPrint. pixelPerUnitX infoPrintCR. |
|
956 |
'PNGReader: ppuY:' infoPrint. pixelPerUnitY infoPrintCR. |
|
957 |
'PNGReader: unit:' infoPrint. unit infoPrintCR. |
|
958 |
]. |
|
959 |
||
| 2705 | 960 |
^ true |
| 308 | 961 |
! |
962 |
||
963 |
processPLTEChunkLen:len |
|
| 1671 | 964 |
"read a color palette" |
965 |
||
| 2725 | 966 |
|n "{ Class: SmallInteger }"
|
| 3972 | 967 |
redBytes greenBytes blueBytes |
968 |
triple| |
|
| 308 | 969 |
|
970 |
(len \\ 3) ~~ 0 ifTrue:[ |
|
971 |
'PNGReader: invalid size of PLTE chunk' infoPrintCR. |
|
972 |
^ false |
|
973 |
]. |
|
974 |
n := len // 3. |
|
975 |
redBytes := ByteArray new:n. |
|
976 |
greenBytes := ByteArray new:n. |
|
977 |
blueBytes := ByteArray new:n. |
|
978 |
||
| 3972 | 979 |
triple := ByteArray new:3. |
980 |
||
| 308 | 981 |
1 to:n do:[:i | |
| 3972 | 982 |
inStream next:3 into:triple startingAt:1. |
983 |
redBytes at:i put:(triple at:1). |
|
984 |
greenBytes at:i put:(triple at:2). |
|
985 |
blueBytes at:i put:(triple at:3) |
|
| 308 | 986 |
]. |
987 |
||
| 2725 | 988 |
colorMap := MappedPalette |
989 |
redVector:redBytes |
|
990 |
greenVector:greenBytes |
|
991 |
blueVector:blueBytes. |
|
992 |
||
| 308 | 993 |
^ true |
994 |
||
| 3972 | 995 |
"Created: / 21-06-1996 / 21:22:28 / cg" |
996 |
"Modified: / 23-08-2017 / 16:58:04 / cg" |
|
| 308 | 997 |
! |
998 |
||
999 |
processSBITChunkLen:len |
|
1000 |
inStream skip:len. |
|
1001 |
^ true |
|
1002 |
||
1003 |
"Created: 21.6.1996 / 21:13:09 / cg" |
|
1004 |
! |
|
1005 |
||
| 3900 | 1006 |
processSPALChunkLen:len |
1007 |
"/ ignored |
|
1008 |
"/ inStream nextBytes:len. |
|
1009 |
||
1010 |
inStream skip:len. |
|
1011 |
^ true |
|
1012 |
||
1013 |
"Created: / 17-02-2017 / 11:31:40 / cg" |
|
1014 |
! |
|
1015 |
||
| 3762 | 1016 |
processTEXTChunkLen:len |
1017 |
"/ textual data in iso8859 coding. |
|
1018 |
||
1019 |
"/ currently ignored - not needed to display png images |
|
1020 |
"/ Keyword: 1-79 bytes (character string) |
|
1021 |
"/ Null separator: 1 byte |
|
1022 |
"/ Text: n bytes (character string) |
|
1023 |
||
1024 |
"/ if needed, set processTextChunks to true somewhere... |
|
1025 |
processTextChunks == true ifTrue:[ |
|
1026 |
|chunkData keyword text i| |
|
1027 |
||
1028 |
chunkData := inStream nextBytes:len. |
|
1029 |
i := chunkData indexOf:0. |
|
1030 |
keyword := (chunkData copyTo:i-1) asString. |
|
1031 |
text := (chunkData copyFrom:i+1) asString. |
|
1032 |
self handleText:text keyword:keyword. |
|
1033 |
] ifFalse:[ |
|
1034 |
inStream skip:len. |
|
1035 |
]. |
|
| 308 | 1036 |
^ true |
1037 |
||
1038 |
"Modified: 21.6.1996 / 21:15:27 / cg" |
|
1039 |
! |
|
1040 |
||
1041 |
processTIMEChunkLen:len |
|
1042 |
inStream skip:len. |
|
1043 |
^ true |
|
1044 |
||
1045 |
"Created: 21.6.1996 / 21:15:43 / cg" |
|
1046 |
"Modified: 21.6.1996 / 21:20:42 / cg" |
|
1047 |
! |
|
1048 |
||
| 2707 | 1049 |
processTRNSChunkLen:len |
| 3900 | 1050 |
paletteAlphaEntries := inStream nextBytes:len. |
| 3904 | 1051 |
|
1052 |
colorType == ColorTypeRGB ifTrue:[ |
|
1053 |
len ~~ 3 ifTrue:[ |
|
1054 |
Logger warning:'PNG: bad trns chunk size'. |
|
1055 |
paletteAlphaEntries := nil. |
|
1056 |
]. |
|
1057 |
^ true |
|
1058 |
]. |
|
1059 |
colorType == ColorTypePalette ifTrue:[ |
|
1060 |
len ~~ 1 ifTrue:[ |
|
1061 |
Logger warning:'PNG: bad trns chunk size'. |
|
1062 |
paletteAlphaEntries := nil. |
|
1063 |
]. |
|
1064 |
^ true |
|
1065 |
]. |
|
1066 |
colorType == ColorTypeGray ifTrue:[ |
|
1067 |
len ~~ 2 ifTrue:[ |
|
1068 |
Logger warning:'PNG: bad trns chunk size'. |
|
1069 |
paletteAlphaEntries := nil. |
|
1070 |
]. |
|
1071 |
^ true |
|
1072 |
]. |
|
1073 |
paletteAlphaEntries := nil. |
|
| 2707 | 1074 |
^ true |
| 3900 | 1075 |
|
| 3904 | 1076 |
"Modified (format): / 17-02-2017 / 16:57:27 / cg" |
| 2707 | 1077 |
! |
1078 |
||
| 308 | 1079 |
processZTXTChunkLen:len |
| 3762 | 1080 |
"/ compressed text |
1081 |
||
1082 |
"/ currently ignored - not needed to display png images |
|
| 308 | 1083 |
inStream skip:len. |
1084 |
^ true |
|
1085 |
||
1086 |
"Created: 21.6.1996 / 21:15:58 / cg" |
|
1087 |
! ! |
|
1088 |
||
| 3900 | 1089 |
!PNGReader methodsFor:'reading-private filtering'! |
| 2696 | 1090 |
|
| 2909 | 1091 |
filterAverage:count |
| 2699 | 1092 |
"Use the average of the pixel to the left and the pixel above as a predictor" |
| 2909 | 1093 |
|
1094 |
|delta| |
|
| 2699 | 1095 |
|
| 3609 | 1096 |
%{
|
1097 |
if (__isByteArray(__INST(thisScanline)) |
|
1098 |
&& __isByteArray(__INST(prevScanline)) |
|
1099 |
&& __isSmallInteger(__INST(depth)) |
|
1100 |
&& __isSmallInteger(count)) {
|
|
1101 |
unsigned char *__thisScanline = __byteArrayVal(__INST(thisScanline)); |
|
1102 |
unsigned int __sz_this = __byteArraySize(__INST(thisScanline)); |
|
1103 |
unsigned char *__prevScanline = __byteArrayVal(__INST(prevScanline)); |
|
1104 |
unsigned int __sz_prev = __byteArraySize(__INST(prevScanline)); |
|
1105 |
INT __count = __intVal(count); |
|
1106 |
INT __delta = __intVal(__INST(depth)) / 8; |
|
1107 |
int __i; |
|
1108 |
||
1109 |
if (__delta < 1) __delta = 1; |
|
1110 |
for (__i=0; __i<__delta; __i++) {
|
|
1111 |
__thisScanline[__i] += (__prevScanline[__i] >> 1); |
|
1112 |
} |
|
1113 |
for (; __i < __count; __i++) {
|
|
1114 |
__thisScanline[__i] += ((__prevScanline[__i] + __thisScanline[__i-__delta]) >> 1); |
|
1115 |
} |
|
1116 |
RETURN(self); |
|
1117 |
} |
|
1118 |
%}. |
|
1119 |
||
1120 |
delta := depth // 8 max:1. |
|
| 2909 | 1121 |
1 to:delta do:[:i | |
| 3384 | 1122 |
thisScanline at:i put:((thisScanline at:i) + ((prevScanline at:i) // 2) bitAnd:255) |
| 2909 | 1123 |
]. |
1124 |
delta + 1 to:count do:[:i | |
|
| 3384 | 1125 |
thisScanline at:i put:((thisScanline at:i) + (((prevScanline at:i) + (thisScanline at:i - delta)) // 2) bitAnd:255) |
| 2909 | 1126 |
] |
1127 |
||
1128 |
"Modified: / 03-05-2011 / 12:14:01 / cg" |
|
| 2699 | 1129 |
! |
1130 |
||
| 2696 | 1131 |
filterHorizontal:count |
1132 |
"use the pixel to the left as a predictor" |
|
1133 |
||
1134 |
|delta| |
|
1135 |
||
| 3608 | 1136 |
%{
|
1137 |
if (__isByteArray(__INST(thisScanline)) |
|
1138 |
&& __isByteArray(__INST(prevScanline)) |
|
1139 |
&& __isSmallInteger(__INST(depth)) |
|
1140 |
&& __isSmallInteger(count)) {
|
|
1141 |
unsigned char *__thisScanline = __byteArrayVal(__INST(thisScanline)); |
|
1142 |
unsigned int __sz_this = __byteArraySize(__INST(thisScanline)); |
|
1143 |
INT __count = __intVal(count); |
|
1144 |
INT __delta = __intVal(__INST(depth)) / 8; |
|
1145 |
int __i; |
|
1146 |
||
1147 |
if (__delta < 1) __delta = 1; |
|
1148 |
for (__i = __delta; __i < __count; __i++) {
|
|
1149 |
__thisScanline[__i] = __thisScanline[__i] + __thisScanline[__i-__delta]; |
|
1150 |
} |
|
1151 |
RETURN(self); |
|
1152 |
} |
|
1153 |
%}. |
|
1154 |
||
1155 |
delta := depth // 8 max:1. |
|
| 2696 | 1156 |
delta+1 to:count do:[:i| |
1157 |
thisScanline at:i put:(((thisScanline at:i)+ (thisScanline at:i-delta)) bitAnd:255) |
|
1158 |
] |
|
| 4099 | 1159 |
|
1160 |
"Modified: / 02-06-2018 / 06:50:57 / Claus Gittinger" |
|
| 2696 | 1161 |
! |
1162 |
||
| 2699 | 1163 |
filterNone: count |
| 2909 | 1164 |
"/ no filter - scanline is as is |
1165 |
||
1166 |
"Modified: / 03-05-2011 / 12:14:20 / cg" |
|
| 2699 | 1167 |
! |
1168 |
||
| 2909 | 1169 |
filterPaeth:count |
|
2697
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1170 |
"Select one of (the pixel to the left, the pixel above and the pixel to above left) to |
| 2909 | 1171 |
predict the value of this pixel" |
1172 |
||
1173 |
|delta| |
|
|
2697
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1174 |
|
| 3607 | 1175 |
%{
|
1176 |
if (__isByteArray(__INST(thisScanline)) |
|
1177 |
&& __isByteArray(__INST(prevScanline)) |
|
1178 |
&& __isSmallInteger(__INST(depth)) |
|
1179 |
&& __isSmallInteger(count)) {
|
|
1180 |
unsigned char *__thisScanline = __byteArrayVal(__INST(thisScanline)); |
|
1181 |
unsigned int __sz_this = __byteArraySize(__INST(thisScanline)); |
|
1182 |
unsigned char *__prevScanline = __byteArrayVal(__INST(prevScanline)); |
|
1183 |
unsigned int __sz_prev = __byteArraySize(__INST(prevScanline)); |
|
1184 |
INT __count = __intVal(count); |
|
1185 |
INT __delta = __intVal(__INST(depth)) / 8; |
|
1186 |
int __i; |
|
1187 |
||
1188 |
if (__delta < 1) __delta = 1; |
|
1189 |
for (__i=0; __i<__delta; __i++) {
|
|
1190 |
unsigned int __pix = __thisScanline[__i] + __prevScanline[__i]; |
|
1191 |
__thisScanline[__i] = __pix; |
|
1192 |
} |
|
1193 |
for (; __i < __count; __i++) {
|
|
1194 |
int __pCenter = __thisScanline[__i]; |
|
1195 |
int __pLeft = __thisScanline[__i - __delta]; |
|
1196 |
int __pAbove = __prevScanline[__i]; |
|
1197 |
int __pAboveLeft = __prevScanline[__i - __delta]; |
|
1198 |
int __pa, __pb, __pc; |
|
1199 |
int __p; |
|
1200 |
||
1201 |
__pa = (__pAbove - __pAboveLeft); |
|
1202 |
__pa = __pa < 0 ? -__pa : __pa; |
|
1203 |
__pb = (__pLeft - __pAboveLeft); |
|
1204 |
__pb = __pb < 0 ? -__pb : __pb; |
|
1205 |
__pc = __pLeft + __pAbove - __pAboveLeft - __pAboveLeft; |
|
1206 |
__pc = __pc < 0 ? -__pc : __pc; |
|
1207 |
if ((__pa <= __pb) && (__pa <= __pc)) __p = __pLeft; |
|
1208 |
else if (__pb <= __pc) __p = __pAbove; |
|
1209 |
else __p = __pAboveLeft; |
|
1210 |
||
1211 |
__thisScanline[__i] = __pCenter + __p; |
|
1212 |
} |
|
1213 |
RETURN(self); |
|
1214 |
} |
|
1215 |
%}. |
|
1216 |
||
1217 |
delta := depth // 8 max:1. |
|
| 2909 | 1218 |
1 to:delta do:[:i | |
1219 |
thisScanline |
|
1220 |
at:i |
|
1221 |
put:(((thisScanline at:i) + (prevScanline at:i)) bitAnd:255) |
|
1222 |
]. |
|
1223 |
delta + 1 to:count do:[:i | |
|
1224 |
thisScanline |
|
1225 |
at:i |
|
1226 |
put:(((thisScanline at:i) + (self |
|
1227 |
paethPredictLeft:(thisScanline at:i - delta) |
|
1228 |
above:(prevScanline at:i) |
|
1229 |
aboveLeft:(prevScanline at:i - delta))) |
|
1230 |
bitAnd:255) |
|
1231 |
] |
|
1232 |
||
1233 |
"Modified: / 03-05-2011 / 12:14:43 / cg" |
|
|
2697
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1234 |
! |
|
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1235 |
|
| 2696 | 1236 |
filterScanline:filterType count:count |
| 3612 | 1237 |
filterType == 0 ifTrue:[^ self]. |
1238 |
||
| 2696 | 1239 |
self |
| 3612 | 1240 |
perform:(#(filterHorizontal: filterVertical: filterAverage: filterPaeth:) at:filterType) |
| 2696 | 1241 |
with:count |
| 2909 | 1242 |
|
1243 |
"Modified: / 03-05-2011 / 12:13:31 / cg" |
|
|
2697
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1244 |
! |
|
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1245 |
|
| 2909 | 1246 |
filterVertical:count |
|
2697
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1247 |
"Use the pixel above as a predictor" |
| 2909 | 1248 |
|
| 3608 | 1249 |
%{
|
1250 |
if (__isByteArray(__INST(thisScanline)) |
|
1251 |
&& __isByteArray(__INST(prevScanline)) |
|
1252 |
&& __isSmallInteger(count)) {
|
|
1253 |
unsigned char *__thisScanline = __byteArrayVal(__INST(thisScanline)); |
|
1254 |
unsigned int __sz_this = __byteArraySize(__INST(thisScanline)); |
|
1255 |
unsigned char *__prevScanline = __byteArrayVal(__INST(prevScanline)); |
|
1256 |
unsigned int __sz_prev = __byteArraySize(__INST(prevScanline)); |
|
1257 |
INT __count = __intVal(count); |
|
1258 |
int __i; |
|
1259 |
||
1260 |
for (__i=0; __i<__count; __i++) {
|
|
1261 |
unsigned int __pix = __thisScanline[__i] + __prevScanline[__i]; |
|
1262 |
__thisScanline[__i] = __pix; |
|
1263 |
} |
|
1264 |
RETURN(self); |
|
1265 |
} |
|
1266 |
%}. |
|
1267 |
||
| 2909 | 1268 |
1 to:count do:[:i | |
1269 |
thisScanline |
|
1270 |
at:i |
|
1271 |
put:(((thisScanline at:i) + (prevScanline at:i)) bitAnd:255) |
|
1272 |
] |
|
|
2697
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1273 |
|
| 2909 | 1274 |
"Modified: / 03-05-2011 / 12:14:34 / cg" |
|
2697
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1275 |
! |
|
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1276 |
|
| 3607 | 1277 |
paethPredictLeft: l above: a aboveLeft: al |
|
2697
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1278 |
"Predicts the value of a pixel based on nearby pixels, based on Paeth (GG II, 1991)" |
|
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1279 |
|
|
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1280 |
| pa pb pc | |
|
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1281 |
|
| 3607 | 1282 |
pa := a > al ifTrue: [a - al] ifFalse: [al - a]. |
1283 |
pb := l > al ifTrue: [l - al] ifFalse: [al - l]. |
|
1284 |
pc := l + a - al - al. |
|
|
2697
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1285 |
pc < 0 ifTrue: [ |
|
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1286 |
pc := pc * -1 |
|
8e8223bf25af
more stuff added (but still not complete)
Claus Gittinger <cg@exept.de>
parents:
2696
diff
changeset
|
1287 |
]. |
| 3607 | 1288 |
((pa <= pb) and: [pa <= pc]) ifTrue: [^ l]. |
1289 |
(pb <= pc) ifTrue: [^ a]. |
|
1290 |
^ al |
|
| 2696 | 1291 |
! ! |
1292 |
||
| 3900 | 1293 |
!PNGReader methodsFor:'reading-private pixel copy'! |
| 2699 | 1294 |
|
| 2909 | 1295 |
copyPixels:y at:startX by:incX |
| 2704 | 1296 |
"Handle interlaced pixels of supported colorTypes" |
| 2909 | 1297 |
|
1298 |
|s| |
|
| 2699 | 1299 |
|
| 3598 | 1300 |
"/ per color type copy methods |
1301 |
s := #( |
|
| 3900 | 1302 |
#copyPixelsGray:at:by: "/ 0 = ColorTypeGray |
| 2909 | 1303 |
nil |
| 3900 | 1304 |
#copyPixelsRGB:at:by: "/ 2 = ColorTypeRGB |
1305 |
#copyPixelsIndexed:at:by: "/ 3 = ColorTypePalette |
|
1306 |
#copyPixelsGrayAlpha:at:by: "/ 4 = ColorTypeGrayAlpha |
|
| 2909 | 1307 |
nil |
| 3900 | 1308 |
#copyPixelsRGBA:at:by: "/ 6 = ColorTypeRGBA |
| 2909 | 1309 |
) at:colorType + 1. |
| 3437 | 1310 |
self perform:s with:y with:startX with:incX |
| 1848 | 1311 |
|
| 2909 | 1312 |
"Modified: / 03-05-2011 / 12:02:45 / cg" |
| 3900 | 1313 |
"Modified (comment): / 16-02-2017 / 19:42:47 / cg" |
| 3327 | 1314 |
! |
1315 |
||
| 3598 | 1316 |
copyPixelsGray:y at:startX by:incX |
1317 |
"Handle interlaced pixels of supported colorTypes. |
|
1318 |
Untested code - please verify" |
|
1319 |
||
| 3611 | 1320 |
|srcIndex "{ Class: SmallInteger }"
|
1321 |
srcMask "{ Class: SmallInteger }"
|
|
1322 |
nPixels "{ Class: SmallInteger }"
|
|
1323 |
dstIndex "{ Class: SmallInteger }"
|
|
1324 |
dstMask "{ Class: SmallInteger }"
|
|
1325 |
x "{ Class: SmallInteger }"
|
|
1326 |
bits "{ Class: SmallInteger }"
|
|
1327 |
bitMask "{ Class: SmallInteger }"
|
|
1328 |
rS "{ Class: SmallInteger }"
|
|
1329 |
lS "{ Class: SmallInteger }"
|
|
1330 |
rowIndex "{ Class: SmallInteger }"|
|
|
| 3598 | 1331 |
|
1332 |
nPixels := width // incX. |
|
1333 |
srcIndex := 0. srcMask := 0. x := startX. |
|
1334 |
||
1335 |
depth == 1 ifTrue:[ |
|
1336 |
dstIndex := (y * bytesPerScanline) + (startX // 8) + 1. |
|
1337 |
dstMask := 16r80 >> (x \\ 8). |
|
1338 |
||
1339 |
1 to:nPixels do:[:cnt | |
|
1340 |
srcMask == 0 ifTrue:[ |
|
1341 |
srcMask := 16r80. |
|
1342 |
srcIndex := srcIndex + 1. |
|
1343 |
bits := thisScanline at:srcIndex. |
|
1344 |
]. |
|
1345 |
bitMask := (bits bitAnd:srcMask) == 0 ifTrue:[0] ifFalse:[dstMask]. |
|
1346 |
bitMask ~~ 0 ifTrue:[ |
|
1347 |
data at:dstIndex put:((data at:dstIndex) bitOr:bitMask). |
|
1348 |
]. |
|
1349 |
x := x + incX. |
|
1350 |
dstMask := dstMask >> incX. |
|
1351 |
dstMask == 0 ifTrue:[ |
|
1352 |
dstIndex := dstIndex + 1. |
|
1353 |
dstMask := 16r80 >> (x \\ 8). |
|
1354 |
]. |
|
1355 |
srcMask := srcMask bitShift:-1. |
|
1356 |
]. |
|
1357 |
^ self. |
|
1358 |
]. |
|
1359 |
||
1360 |
depth == 2 ifTrue:[ |
|
1361 |
dstIndex := (y * bytesPerScanline) + (startX // 4) + 1. |
|
1362 |
lS := 6 - ((x \\ 4) * 2). |
|
1363 |
rS := -1. |
|
1364 |
1 to:nPixels do:[:cnt | |
|
1365 |
rS < 0 ifTrue:[ |
|
1366 |
srcIndex := srcIndex + 1. |
|
1367 |
bits := thisScanline at:srcIndex. |
|
1368 |
rS := 6. |
|
1369 |
]. |
|
1370 |
bitMask := ((bits >> rS) bitAnd:2r11). |
|
1371 |
bitMask ~~ 0 ifTrue:[ |
|
1372 |
bitMask := bitMask << lS. |
|
1373 |
data at:dstIndex put:((data at:dstIndex) bitOr:bitMask). |
|
1374 |
]. |
|
1375 |
lS := lS - (incX * 2). |
|
1376 |
lS < 0 ifTrue:[ |
|
1377 |
lS <= -8 ifTrue:[ |
|
1378 |
dstIndex := dstIndex + 2. |
|
1379 |
lS := lS + 8 + 8. |
|
1380 |
] ifFalse:[ |
|
1381 |
dstIndex := dstIndex + 1. |
|
1382 |
lS := lS + 8. |
|
1383 |
]. |
|
1384 |
]. |
|
1385 |
rS := rS - 2. |
|
1386 |
]. |
|
1387 |
^ self. |
|
1388 |
]. |
|
1389 |
||
1390 |
depth == 4 ifTrue:[ |
|
1391 |
rowIndex := (y * bytesPerScanline) + 1. |
|
1392 |
dstIndex := rowIndex + (x // 2). |
|
1393 |
rS := -1. |
|
1394 |
1 to:nPixels do:[:cnt | |
|
1395 |
rS < 0 ifTrue:[ |
|
1396 |
srcIndex := srcIndex + 1. |
|
1397 |
bits := thisScanline at:srcIndex. |
|
1398 |
rS := 4. |
|
1399 |
]. |
|
1400 |
bitMask := ((bits >> rS) bitAnd:2r1111). |
|
1401 |
x even ifTrue:[ |
|
1402 |
bitMask := bitMask bitShift:4. |
|
1403 |
]. |
|
1404 |
data at:dstIndex put:((data at:dstIndex) bitOr:bitMask). |
|
1405 |
x := x + incX. |
|
1406 |
dstIndex := rowIndex + (x // 2). |
|
1407 |
rS := rS - 4. |
|
1408 |
]. |
|
1409 |
^ self. |
|
1410 |
]. |
|
1411 |
||
1412 |
depth == 8 ifTrue:[ |
|
1413 |
srcIndex := 1. |
|
1414 |
dstIndex := (y * bytesPerScanline) + (startX) + 1. |
|
1415 |
||
1416 |
1 to:nPixels do:[:n | |
|
1417 |
data at:dstIndex put:(thisScanline at:srcIndex). |
|
1418 |
srcIndex := srcIndex + 1. |
|
1419 |
dstIndex := dstIndex + incX |
|
1420 |
]. |
|
1421 |
^ self. |
|
1422 |
]. |
|
1423 |
||
1424 |
depth == 16 ifTrue:[ |
|
1425 |
srcIndex := 1. |
|
1426 |
dstIndex := (y * bytesPerScanline) + (startX*2) + 1. |
|
1427 |
||
1428 |
1 to:nPixels do:[:n | |
|
| 3601 | 1429 |
data unsignedInt16At:dstIndex put:(thisScanline unsignedInt16At:srcIndex). |
| 3598 | 1430 |
srcIndex := srcIndex + 2. |
1431 |
dstIndex := dstIndex + (incX * 2) |
|
1432 |
]. |
|
1433 |
^ self. |
|
1434 |
]. |
|
1435 |
self error:'unsupported depth'. |
|
1436 |
! |
|
1437 |
||
| 4017 | 1438 |
copyPixelsGrayAlpha:y at:startX by:incX |
1439 |
"Handle interlaced pixels of supported colorTypes." |
|
1440 |
||
1441 |
|srcIndex "{ Class: SmallInteger }"
|
|
1442 |
srcMask "{ Class: SmallInteger }"
|
|
1443 |
nPixels "{ Class: SmallInteger }"
|
|
1444 |
dstIndex "{ Class: SmallInteger }"
|
|
1445 |
dstMask "{ Class: SmallInteger }"
|
|
1446 |
x "{ Class: SmallInteger }"
|
|
1447 |
bits "{ Class: SmallInteger }"
|
|
1448 |
bitMask "{ Class: SmallInteger }"
|
|
1449 |
rS "{ Class: SmallInteger }"
|
|
1450 |
lS "{ Class: SmallInteger }"
|
|
1451 |
rowIndex "{ Class: SmallInteger }"
|
|
1452 |
pix alpha gray| |
|
1453 |
||
1454 |
nPixels := width // incX. |
|
1455 |
srcIndex := 0. srcMask := 0. x := startX. |
|
1456 |
||
1457 |
"/ depth == 1 ifTrue:[ |
|
1458 |
"/ dstIndex := (y * bytesPerScanline) + (startX // 8) + 1. |
|
1459 |
"/ dstMask := 16r80 >> (x \\ 8). |
|
1460 |
"/ |
|
1461 |
"/ 1 to:nPixels do:[:cnt | |
|
1462 |
"/ srcMask == 0 ifTrue:[ |
|
1463 |
"/ srcMask := 16r80. |
|
1464 |
"/ srcIndex := srcIndex + 1. |
|
1465 |
"/ bits := thisScanline at:srcIndex. |
|
1466 |
"/ ]. |
|
1467 |
"/ bitMask := (bits bitAnd:srcMask) == 0 ifTrue:[0] ifFalse:[dstMask]. |
|
1468 |
"/ bitMask ~~ 0 ifTrue:[ |
|
1469 |
"/ data at:dstIndex put:((data at:dstIndex) bitOr:bitMask). |
|
1470 |
"/ ]. |
|
1471 |
"/ x := x + incX. |
|
1472 |
"/ dstMask := dstMask >> incX. |
|
1473 |
"/ dstMask == 0 ifTrue:[ |
|
1474 |
"/ dstIndex := dstIndex + 1. |
|
1475 |
"/ dstMask := 16r80 >> (x \\ 8). |
|
1476 |
"/ ]. |
|
1477 |
"/ srcMask := srcMask bitShift:-1. |
|
1478 |
"/ ]. |
|
1479 |
"/ ^ self. |
|
1480 |
"/ ]. |
|
1481 |
"/ |
|
1482 |
"/ depth == 2 ifTrue:[ |
|
1483 |
"/ dstIndex := (y * bytesPerScanline) + (startX // 4) + 1. |
|
1484 |
"/ lS := 6 - ((x \\ 4) * 2). |
|
1485 |
"/ rS := -1. |
|
1486 |
"/ 1 to:nPixels do:[:cnt | |
|
1487 |
"/ rS < 0 ifTrue:[ |
|
1488 |
"/ srcIndex := srcIndex + 1. |
|
1489 |
"/ bits := thisScanline at:srcIndex. |
|
1490 |
"/ rS := 6. |
|
1491 |
"/ ]. |
|
1492 |
"/ bitMask := ((bits >> rS) bitAnd:2r11). |
|
1493 |
"/ bitMask ~~ 0 ifTrue:[ |
|
1494 |
"/ bitMask := bitMask << lS. |
|
1495 |
"/ data at:dstIndex put:((data at:dstIndex) bitOr:bitMask). |
|
1496 |
"/ ]. |
|
1497 |
"/ lS := lS - (incX * 2). |
|
1498 |
"/ lS < 0 ifTrue:[ |
|
1499 |
"/ lS <= -8 ifTrue:[ |
|
1500 |
"/ dstIndex := dstIndex + 2. |
|
1501 |
"/ lS := lS + 8 + 8. |
|
1502 |
"/ ] ifFalse:[ |
|
1503 |
"/ dstIndex := dstIndex + 1. |
|
1504 |
"/ lS := lS + 8. |
|
1505 |
"/ ]. |
|
1506 |
"/ ]. |
|
1507 |
"/ rS := rS - 2. |
|
1508 |
"/ ]. |
|
1509 |
"/ ^ self. |
|
1510 |
"/ ]. |
|
1511 |
"/ |
|
1512 |
"/ depth == 4 ifTrue:[ |
|
1513 |
"/ rowIndex := (y * bytesPerScanline) + 1. |
|
1514 |
"/ dstIndex := rowIndex + (x // 2). |
|
1515 |
"/ rS := -1. |
|
1516 |
"/ 1 to:nPixels do:[:cnt | |
|
1517 |
"/ rS < 0 ifTrue:[ |
|
1518 |
"/ srcIndex := srcIndex + 1. |
|
1519 |
"/ bits := thisScanline at:srcIndex. |
|
1520 |
"/ rS := 4. |
|
1521 |
"/ ]. |
|
1522 |
"/ bitMask := ((bits >> rS) bitAnd:2r1111). |
|
1523 |
"/ x even ifTrue:[ |
|
1524 |
"/ bitMask := bitMask bitShift:4. |
|
1525 |
"/ ]. |
|
1526 |
"/ data at:dstIndex put:((data at:dstIndex) bitOr:bitMask). |
|
1527 |
"/ x := x + incX. |
|
1528 |
"/ dstIndex := rowIndex + (x // 2). |
|
1529 |
"/ rS := rS - 4. |
|
1530 |
"/ ]. |
|
1531 |
"/ ^ self. |
|
1532 |
"/ ]. |
|
1533 |
"/ |
|
1534 |
"/ depth == 8 ifTrue:[ |
|
1535 |
"/ srcIndex := 1. |
|
1536 |
"/ dstIndex := (y * bytesPerScanline) + (startX) + 1. |
|
1537 |
"/ |
|
1538 |
"/ 1 to:nPixels do:[:n | |
|
1539 |
"/ data at:dstIndex put:(thisScanline at:srcIndex). |
|
1540 |
"/ srcIndex := srcIndex + 1. |
|
1541 |
"/ dstIndex := dstIndex + incX |
|
1542 |
"/ ]. |
|
1543 |
"/ ^ self. |
|
1544 |
"/ ]. |
|
1545 |
||
1546 |
forceRGB ifTrue:[ |
|
1547 |
(depth == 16 and:[depthImage == 32]) ifTrue:[ |
|
1548 |
"/ converting gray8+alpha8 to r8+g8+b8+alpha8 |
|
1549 |
||
1550 |
srcIndex := 1. |
|
1551 |
dstIndex := (y * (width * 4)) + (startX*4) + 1. |
|
1552 |
||
1553 |
1 to:nPixels do:[:n | |
|
| 4099 | 1554 |
pix := thisScanline unsignedInt16At:srcIndex MSB:true. |
| 4017 | 1555 |
alpha := pix bitAnd:16rFF. |
1556 |
gray := (pix rightShift:8) bitAnd:16rFF. |
|
1557 |
"/ put r-g-b-a |
|
1558 |
data at:dstIndex put:gray. |
|
1559 |
data at:dstIndex+1 put:gray. |
|
1560 |
data at:dstIndex+2 put:gray. |
|
1561 |
data at:dstIndex+3 put:alpha. |
|
1562 |
||
1563 |
srcIndex := srcIndex + 2. |
|
1564 |
dstIndex := dstIndex + (incX * 4) |
|
1565 |
]. |
|
1566 |
^ self. |
|
1567 |
]. |
|
1568 |
(depth == 32 and:[depthImage == 32]) ifTrue:[ |
|
1569 |
"/ converting gray16+alpha16 to r8+g8+b8+alpha8 |
|
1570 |
||
1571 |
srcIndex := 1. |
|
1572 |
dstIndex := (y * (width * 4)) + (startX*4) + 1. |
|
1573 |
||
1574 |
1 to:nPixels do:[:n | |
|
| 4099 | 1575 |
pix := thisScanline unsignedInt32At:srcIndex MSB:true. |
| 4017 | 1576 |
|
1577 |
alpha := pix bitAnd:16rFFFF. |
|
1578 |
gray := (pix rightShift:16) bitAnd:16rFFFF. |
|
1579 |
"/ reduce to 8 bit |
|
1580 |
alpha := alpha rightShift:8. |
|
1581 |
gray := gray rightShift:8. |
|
1582 |
||
1583 |
"/ put r-g-b-a |
|
1584 |
data at:dstIndex put:gray. |
|
1585 |
data at:dstIndex+1 put:gray. |
|
1586 |
data at:dstIndex+2 put:gray. |
|
1587 |
data at:dstIndex+3 put:alpha. |
|
1588 |
||
1589 |
srcIndex := srcIndex + 4. |
|
1590 |
dstIndex := dstIndex + (incX * 4) |
|
1591 |
]. |
|
1592 |
^ self. |
|
1593 |
]. |
|
1594 |
]. |
|
1595 |
self error:'unsupported depth'. |
|
1596 |
||
1597 |
"Created: / 17-09-2017 / 14:20:24 / cg" |
|
1598 |
"Modified: / 17-09-2017 / 15:28:38 / cg" |
|
| 4099 | 1599 |
"Modified: / 02-06-2018 / 07:08:15 / Claus Gittinger" |
| 4017 | 1600 |
! |
1601 |
||
| 3598 | 1602 |
copyPixelsIndexed:y at:startX by:incX |
1603 |
self copyPixelsGray:y at:startX by:incX |
|
1604 |
! |
|
1605 |
||
1606 |
copyPixelsRGB:y at:startX by:incX |
|
1607 |
"Handle interlaced pixels of supported colorTypes. |
|
1608 |
Untested code - please verify" |
|
1609 |
||
| 3611 | 1610 |
|srcIndex "{ Class: SmallInteger }"
|
1611 |
nPixels "{ Class: SmallInteger }"
|
|
1612 |
dstIndex "{ Class: SmallInteger }"
|
|
1613 |
dstInc "{ Class: SmallInteger }"
|
|
1614 |
bpp "{ Class: SmallInteger }"|
|
|
| 3598 | 1615 |
|
1616 |
bpp := bytesPerScanline // width. |
|
1617 |
||
1618 |
"/ 1 byte per r,g,b |
|
1619 |
srcIndex := 1. |
|
1620 |
dstIndex := (y * bytesPerScanline) + (startX * bpp) + 1. |
|
1621 |
dstInc := incX * bpp. |
|
1622 |
||
1623 |
nPixels := width // incX. |
|
1624 |
1 to:nPixels do:[:n | |
|
1625 |
data replaceFrom:dstIndex to:dstIndex+bpp-1 with:thisScanline startingAt:srcIndex. |
|
1626 |
srcIndex := srcIndex + bpp. |
|
1627 |
dstIndex := dstIndex + dstInc |
|
1628 |
]. |
|
1629 |
! |
|
1630 |
||
| 3327 | 1631 |
copyPixelsRGBA:y at:startX by:incX |
1632 |
"Handle interlaced pixels of supported colorTypes. |
|
1633 |
Untested code - please verify" |
|
1634 |
||
| 3611 | 1635 |
|srcIndex "{ Class: SmallInteger }"
|
1636 |
nPixels "{ Class: SmallInteger }"
|
|
1637 |
dstIndex "{ Class: SmallInteger }"
|
|
1638 |
dstInc "{ Class: SmallInteger }"|
|
|
| 3327 | 1639 |
|
1640 |
srcIndex := 1. |
|
| 3437 | 1641 |
dstIndex := (y * bytesPerScanline) + (startX * 4) + 1. |
1642 |
dstInc := incX * 4. |
|
| 3327 | 1643 |
|
1644 |
nPixels := thisScanline size. |
|
1645 |
[srcIndex < nPixels] whileTrue:[ |
|
| 3437 | 1646 |
data replaceFrom:dstIndex to:dstIndex+3 with:thisScanline startingAt:srcIndex. |
| 3327 | 1647 |
srcIndex := srcIndex + 4. |
| 3437 | 1648 |
dstIndex := dstIndex + dstInc |
| 3327 | 1649 |
]. |
| 2699 | 1650 |
! ! |
1651 |
||
| 3900 | 1652 |
!PNGReader methodsFor:'writing'! |
| 2683 | 1653 |
|
1654 |
save:image onStream:aStream |
|
1655 |
"save image in PNG-file-format onto aStream" |
|
1656 |
||
1657 |
outStream := aStream. |
|
1658 |
outStream binary. |
|
1659 |
||
| 2703 | 1660 |
byteOrder := #msb. |
| 4004 | 1661 |
|
| 2683 | 1662 |
width := image width. |
1663 |
height := image height. |
|
1664 |
photometric := image photometric. |
|
1665 |
samplesPerPixel := image samplesPerPixel. |
|
1666 |
bitsPerSample := image bitsPerSample. |
|
1667 |
colorMap := image colorMap. |
|
1668 |
data := image bits. |
|
| 3893 | 1669 |
mask := image mask. |
1670 |
depth := self bitsPerPixel. |
|
| 3900 | 1671 |
|
| 3909 | 1672 |
outStream nextPutAll:(self class pngHeader). |
| 3893 | 1673 |
|
| 3900 | 1674 |
image mask notNil ifTrue:[ |
| 3972 | 1675 |
((photometric ~~ #rgb) and:[(photometric ~~ #rgba) and:[(photometric ~~ #argb)]]) ifTrue: [ |
| 3949 | 1676 |
self determinePaletteIndexForMaskedPixels |
| 3904 | 1677 |
] ifFalse:[ |
1678 |
photometric := #rgba. |
|
1679 |
]. |
|
| 3900 | 1680 |
]. |
1681 |
||
| 2703 | 1682 |
self writeIHDRChunk. |
1683 |
photometric == #palette ifTrue: [self writePaletteChunk]. |
|
| 3900 | 1684 |
paletteIndexForMaskedPixels notNil ifTrue: [self writeTRNSChunk]. |
| 2703 | 1685 |
self writeImageDataChunk. |
| 4203 | 1686 |
specialChunks notNil ifTrue:[self writeSpecialChunks]. |
| 2683 | 1687 |
self writeEndChunk |
| 3893 | 1688 |
|
| 3972 | 1689 |
"Modified: / 23-08-2017 / 16:25:00 / cg" |
| 4004 | 1690 |
"Modified (format): / 31-08-2017 / 17:26:28 / cg" |
| 4203 | 1691 |
"Modified: / 27-10-2018 / 12:13:03 / Claus Gittinger" |
| 3900 | 1692 |
! ! |
1693 |
||
1694 |
!PNGReader methodsFor:'writing-private'! |
|
1695 |
||
1696 |
determinePaletteIndexForMaskedPixels |
|
1697 |
"/ if all masked pixels are 0, and 0 is not used elsewhere in the image, |
|
1698 |
"/ write it as such. |
|
1699 |
"/ Otherwise, find an unallocated palette index, and assign masked pixels to it. |
|
1700 |
||
1701 |
|usedPixels freePixels pixelIdx| |
|
1702 |
||
1703 |
colorMap size < 256 ifTrue:[ |
|
1704 |
paletteIndexForMaskedPixels := colorMap size. |
|
1705 |
] ifFalse:[ |
|
1706 |
usedPixels := data usedValues. |
|
1707 |
usedPixels size == 256 ifTrue:[ |
|
1708 |
self error:'cannot represent image (no palette slot for mask)' |
|
1709 |
]. |
|
1710 |
freePixels := (0 to:255) asSet removeAllFoundIn:usedPixels. |
|
1711 |
paletteIndexForMaskedPixels := freePixels first. |
|
1712 |
]. |
|
1713 |
||
| 4181 | 1714 |
depth == 8 ifTrue:[ |
1715 |
"/ rewrite data: wherever masked, change pixel to paletteIndexForMaskedPixels |
|
1716 |
data := data copy. |
|
1717 |
pixelIdx := 1. |
|
1718 |
0 to:height-1 do:[:y | |
|
1719 |
0 to:width-1 do:[:x | |
|
1720 |
(mask pixelAtX:x y:y) == 0 ifTrue:[ |
|
1721 |
data at:pixelIdx put:paletteIndexForMaskedPixels. |
|
1722 |
]. |
|
1723 |
pixelIdx := pixelIdx + 1 |
|
1724 |
] |
|
1725 |
]. |
|
| 3900 | 1726 |
]. |
1727 |
||
1728 |
" |
|
1729 |
PNGReader save:(ToolbarIconLibrary systemBrowserIcon) onFile:'/tmp/icon.png' |
|
1730 |
ImageEditor openOnFile:'/tmp/icon.png' |
|
1731 |
" |
|
1732 |
||
1733 |
"Created: / 16-02-2017 / 19:59:39 / cg" |
|
1734 |
"Modified: / 17-02-2017 / 09:25:57 / cg" |
|
| 4181 | 1735 |
"Modified: / 24-09-2018 / 10:39:34 / Claus Gittinger" |
| 3900 | 1736 |
! ! |
1737 |
||
1738 |
!PNGReader methodsFor:'writing-private chunks'! |
|
| 2683 | 1739 |
|
| 3949 | 1740 |
determineColorTypeAndHasMask |
| 4004 | 1741 |
"sets colorType as side effect; |
1742 |
returns boolean if a mask is present" |
|
1743 |
||
| 3949 | 1744 |
((photometric == #whiteIs0) or:[ (photometric == #blackIs0)]) ifTrue:[ |
1745 |
colorType := ColorTypeGray. |
|
1746 |
^ (samplesPerPixel > 1) |
|
1747 |
]. |
|
1748 |
(photometric == #rgb) ifTrue:[ |
|
1749 |
colorType := ColorTypeRGB. |
|
1750 |
^ (samplesPerPixel > 3) |
|
1751 |
]. |
|
1752 |
(photometric == #rgba) ifTrue:[ |
|
1753 |
colorType := ColorTypeRGBAlpha. |
|
1754 |
^ (samplesPerPixel > 3) |
|
1755 |
]. |
|
1756 |
(photometric == #palette) ifTrue:[ |
|
1757 |
colorType := ColorTypePalette. |
|
1758 |
^ (samplesPerPixel > 1) |
|
1759 |
]. |
|
1760 |
self error:'unhandled photometric: ',photometric asString. |
|
1761 |
^ false. |
|
1762 |
||
1763 |
"Created: / 11-04-2017 / 12:39:30 / cg" |
|
| 4004 | 1764 |
"Modified (comment): / 31-08-2017 / 17:24:31 / cg" |
| 3949 | 1765 |
! |
1766 |
||
| 2703 | 1767 |
writeChunk:chunkTypeChars size:len with:aBlock |
| 2708 | 1768 |
|crc realOutStream chunkBytes| |
1769 |
||
1770 |
realOutStream := outStream. |
|
1771 |
outStream := WriteStream on:(ByteArray new:len). |
|
1772 |
||
| 2703 | 1773 |
outStream nextPutBytes:4 from:chunkTypeChars startingAt:1. |
1774 |
aBlock value. |
|
| 2708 | 1775 |
|
1776 |
chunkBytes := outStream contents. |
|
1777 |
crc := CRC32Stream hashValueOf:chunkBytes. |
|
1778 |
||
1779 |
outStream := realOutStream. |
|
1780 |
||
| 3554 | 1781 |
realOutStream nextPutInt32:len MSB:true. |
| 2708 | 1782 |
realOutStream nextPutAll:chunkBytes. |
| 3554 | 1783 |
realOutStream nextPutInt32:crc MSB:true. |
| 2703 | 1784 |
! |
| 2683 | 1785 |
|
| 2703 | 1786 |
writeEndChunk |
1787 |
self |
|
1788 |
writeChunk: 'IEND' |
|
1789 |
size: 0 |
|
1790 |
with:[ ] |
|
| 2683 | 1791 |
! |
1792 |
||
| 2703 | 1793 |
writeIHDRChunk |
| 4005 | 1794 |
|hasMask bitsPerChannel| |
| 3893 | 1795 |
|
| 3949 | 1796 |
hasMask := self determineColorTypeAndHasMask. |
| 3893 | 1797 |
hasMask ifTrue:[ |
| 3900 | 1798 |
"/ make it grayAlpha / rgba |
1799 |
((colorType == ColorTypeGray) or:[colorType == ColorTypeGray]) ifTrue:[ |
|
1800 |
colorType := colorType bitOr:4. "/ +alpha |
|
1801 |
]. |
|
| 3893 | 1802 |
]. |
| 4005 | 1803 |
|
1804 |
"bitsperchannel" |
|
1805 |
depth <= 8 ifTrue:[ |
|
1806 |
bitsPerChannel := depth |
|
1807 |
] ifFalse:[ |
|
| 4010 | 1808 |
(colorType == ColorTypeRGB or:[colorType == ColorTypeRGBAlpha]) ifTrue:[ |
| 4005 | 1809 |
"/ all channels must have the same nr of bits |
1810 |
self assert:(bitsPerSample asSet size == 1). |
|
1811 |
bitsPerChannel := bitsPerSample first |
|
1812 |
] ifFalse:[ |
|
1813 |
bitsPerChannel := depth |
|
1814 |
] |
|
1815 |
]. |
|
| 3893 | 1816 |
|
| 2683 | 1817 |
self |
1818 |
writeChunk: 'IHDR' |
|
| 3949 | 1819 |
size: (4+4+5) |
| 2683 | 1820 |
with:[ |
| 4004 | 1821 |
outStream nextPutInt32:width MSB:true. |
1822 |
outStream nextPutInt32:height MSB:true. |
|
| 4005 | 1823 |
outStream nextPut: bitsPerChannel. |
| 2703 | 1824 |
outStream nextPut: colorType. |
| 2683 | 1825 |
outStream nextPut: 0. "Compression" |
1826 |
outStream nextPut: 0. "Filter method" |
|
1827 |
outStream nextPut: 0 "Non-interlaced" |
|
1828 |
] |
|
| 3893 | 1829 |
|
| 4010 | 1830 |
"Modified: / 04-09-2017 / 18:34:15 / cg" |
| 2683 | 1831 |
! |
1832 |
||
| 2703 | 1833 |
writeImageDataChunk |
| 3893 | 1834 |
|compressedByteStream compressedBytes zlibWriter idx |
| 3935 | 1835 |
row32 bytesPerPixel| |
| 2703 | 1836 |
|
1837 |
bytesPerScanline := self bytesPerRow. |
|
| 3821 | 1838 |
|
1839 |
compressedByteStream := WriteStream on:(ByteArray new:(bytesPerScanline*height)). |
|
1840 |
zlibWriter := ZipStream writeOpenAsZipStreamOn:compressedByteStream suppressHeaderAndChecksum:false. |
|
1841 |
zlibWriter binary. |
|
| 2703 | 1842 |
|
| 3900 | 1843 |
(mask notNil and:[photometric ~~ #palette]) ifTrue:[ |
| 3935 | 1844 |
(depth == 32) ifTrue:[ |
1845 |
bytesPerPixel := 4 |
|
1846 |
] ifFalse:[ |
|
1847 |
"/ for now - only support depth24 + mask |
|
1848 |
self assert:(depth == 24). |
|
1849 |
bytesPerPixel := 3. |
|
1850 |
]. |
|
| 3893 | 1851 |
|
| 3935 | 1852 |
"/ on-the-fly place mask into the alpha channel. |
| 3893 | 1853 |
row32 := ByteArray new:(4 * width). |
| 3935 | 1854 |
self assert:(bytesPerScanline == (bytesPerPixel * width)). |
1855 |
||
| 3893 | 1856 |
idx := 1. |
1857 |
0 to:height-1 do:[:y | |
|
1858 |
|dstIdx maskRow| |
|
| 2708 | 1859 |
|
| 3893 | 1860 |
"/ expand rgb to rgba |
1861 |
maskRow := mask rowAt:y. |
|
| 3935 | 1862 |
|
| 3893 | 1863 |
dstIdx := 1. |
1864 |
1 to:width do:[:x | |
|
1865 |
row32 at:dstIdx put:(data at:idx). |
|
1866 |
row32 at:dstIdx+1 put:(data at:idx+1). |
|
1867 |
row32 at:dstIdx+2 put:(data at:idx+2). |
|
1868 |
row32 at:dstIdx+3 put:((maskRow at:x) == 0 ifTrue:[0] ifFalse:[16rFF]). |
|
| 3935 | 1869 |
idx := idx + bytesPerPixel. |
| 3893 | 1870 |
dstIdx := dstIdx + 4. |
1871 |
]. |
|
| 3935 | 1872 |
|
| 3893 | 1873 |
zlibWriter nextPutAll:#[0]. "/ no filter |
1874 |
zlibWriter nextPutAll:row32. |
|
1875 |
]. |
|
1876 |
] ifFalse:[ |
|
1877 |
idx := 1. |
|
1878 |
0 to:height-1 do:[:y | |
|
1879 |
|row| |
|
1880 |
||
1881 |
row := data copyFrom:idx to:(idx+bytesPerScanline-1). |
|
1882 |
zlibWriter nextPutAll:#[0]. "/ no filter |
|
1883 |
zlibWriter nextPutAll:row. |
|
1884 |
idx := idx + bytesPerScanline. |
|
1885 |
]. |
|
| 2703 | 1886 |
]. |
| 2708 | 1887 |
|
1888 |
zlibWriter close. |
|
1889 |
compressedBytes := compressedByteStream contents. |
|
1890 |
||
1891 |
self |
|
1892 |
writeChunk: 'IDAT' |
|
1893 |
size:(compressedBytes size) |
|
1894 |
with:[ |
|
1895 |
outStream nextPutAll:compressedBytes |
|
1896 |
] |
|
| 3893 | 1897 |
|
| 3935 | 1898 |
"Modified: / 25-02-2017 / 14:27:34 / cg" |
| 3949 | 1899 |
"Modified (format): / 11-04-2017 / 12:41:22 / cg" |
| 2703 | 1900 |
! |
1901 |
||
| 2683 | 1902 |
writePaletteChunk |
1903 |
self |
|
1904 |
writeChunk: 'PLTE' |
|
1905 |
size: 3 * colorMap size |
|
1906 |
with:[ |
|
| 2703 | 1907 |
colorMap do:[:color | |
1908 |
outStream |
|
1909 |
nextPut: color redByte; |
|
1910 |
nextPut: color greenByte; |
|
1911 |
nextPut: color blueByte |
|
| 2683 | 1912 |
] |
1913 |
] |
|
| 3900 | 1914 |
! |
1915 |
||
| 4203 | 1916 |
writeSpecialChunks |
1917 |
specialChunks keysAndValuesDo:[:chunkType :chunkData | |
|
1918 |
self |
|
1919 |
writeChunk:chunkType |
|
1920 |
size:chunkData size |
|
1921 |
with:[ |
|
1922 |
outStream nextPutBytes:chunkData |
|
1923 |
] |
|
1924 |
]. |
|
1925 |
||
1926 |
"Created: / 27-10-2018 / 12:14:02 / Claus Gittinger" |
|
1927 |
! |
|
1928 |
||
| 3900 | 1929 |
writeTRNSChunk |
1930 |
self |
|
1931 |
writeChunk: 'tRNS' |
|
1932 |
size: 1 |
|
1933 |
with:[ |
|
1934 |
outStream nextPut: paletteIndexForMaskedPixels |
|
1935 |
] |
|
1936 |
||
1937 |
"Created: / 16-02-2017 / 19:58:06 / cg" |
|
| 2683 | 1938 |
! ! |
1939 |
||
| 398 | 1940 |
!PNGReader class methodsFor:'documentation'! |
| 308 | 1941 |
|
1942 |
version |
|
| 3554 | 1943 |
^ '$Header$' |
| 2909 | 1944 |
! |
1945 |
||
1946 |
version_CVS |
|
| 3554 | 1947 |
^ '$Header$' |
| 308 | 1948 |
! ! |
| 1671 | 1949 |
|
| 3100 | 1950 |
|
| 308 | 1951 |
PNGReader initialize! |