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2024-05-24 13:28:31 +02:00
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36
oversampling/WDL/giflib/AUTHORS Normal file
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Lennie Araki
Windows code providing a nicer interface and example program
Michael Brown <michael_brown_uk[AT]hotmail.com>
callbacks to write data via user defined function
Daniel Eisenbud <eisenbud[AT]google.com>
Fixes for crashes with invalid gif files and double freeing of
colormaps
Gershon Elber
original giflib code
Marc Ewing <marc[AT]redhat.com>
spec file (for rpms) updates
Toshio Kuratomi <toshio[AT]tiki-lounge.com>
uncompressed gif writing code
autoconf/automake process
current maintainer
marek <marwaw[AT]users.sourceforge.net>
Gif initialization fix
windows build code
Peter Mehlitz <peter[AT]transvirtual.com>
callbacks to read data from arbitrary sources (like libjpeg/libpng)
Dick Porter <dick[AT]cymru.net>
int/pointer fixes for Alpha
Eric Raymond <esr[AT]snark.thyrsus.com>
long time maintainer of giflib code
Georg Schwarz <geos[AT]epost.de>
IRIX fixes

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oversampling/WDL/giflib/COPYING Normal file
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The GIFLIB distribution is Copyright (c) 1997 Eric S. Raymond
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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oversampling/WDL/giflib/ChangeLog Normal file
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2005-10-09 Toshio Kuratomi <toshio@tiki-lounge.com> - r94
* Sync with libungif r93.
* ChangeLog: Update to r92.
* NEWS: Update with combined libungif/giflib changes.
2005-10-09 Toshio Kuratomi <toshio@tiki-lounge.com> - r92
* lib/gif_lib.h: Change GifPrefixType to unsigned.
2005-10-09 Toshio Kuratomi <toshio@tiki-lounge.com> - r91
* ChangeLog: Update to r90.
* NEWS: Update on GBA and Windows fixes.
2005-10-06 Toshio Kuratomi <toshio@tiki-lounge.com> - r90
Changes from Lennie Araki:
* gba/giftest.mak: Prefix the names of defines for the GBA build with _GBA.
* lib/dgif_lib.c, lib/gif_lib_private.h, lib/gif_err.c:
- When Compiling for Game Boy Advance, file functions are not needed so
exclude DGifOpenFileName(), DGifOpenFileHandle(), DGifSlurp(), and
PrintGifError().
- On Game Boy Advance we need to reduce memory usage. Change values to
short int where appropriate.
* lib/gif_lib.h:
- Handle te GBA changes by defining GifPrefixType and GifWord to int
unless compiling on GBA. Then use unsigned short and short
respectively.
- Fix a problem with the API on _WIN32. DrawText conflicts with the
Windows API. Call it DrawGifText instead.
2005-09-27 Toshio Kuratomi <toshio@tiki-lounge.com> - r86
* Sync with libungif r85.
2005-09-27 Toshio Kuratomi <toshio@tiki-lounge.com> - r82
* AUTHORS: Add Daniel Eisenbud. Obscure email addresses.
* libungif.spec: Bump to version 4.1.4.
* configure.ac: Bump to 4.1.4. No longer check for ranlib.
* doc/lzgif.txt: Change dos line encoding to UNIX.
* lib/dgif_lib.c: (eisenbud)
- Set GifFile's ColorMaps to NULL when we free a colormap object.
- Detect some cases of corrupted GIFs which were crashing the library.
* lib/egif_lib.c: Set ColorMaps to NULL when we free a colormap object.
* lib/gifalloc.c: Set ColorMaps to NULL when we free a colormap object.
* lib/dev2gif.c: Fix redefinition problem on IRIX.
* NEWS: Update to 4.1.4
* util/gifcomb.c: Set a olorMap to NULL.
2004-07-11 Toshio Kuratomi <toshio@tiki-lounge.com> - r79
* gif2iris.c: Fixes from Georg Schwarz <geos[AT]epost.de>.
- stdlib.h is available and needs to be included on IRIX.
- ColorMapSize was being set from non-existent variables.
2004-05-29 Toshio Kuratomi <toshio@tiki-lounge.com> - r76
* Sync with libungif-4.1.3.
2004-05-29 Toshio Kuratomi <toshio@tiki-lounge.com> - r74
* ChangeLog, prop=lastlog: Sync with the subversion logs.
2004-05-29 Toshio Kuratomi <toshio@tiki-lounge.com> - r73
* test-unx: Add a test of extension code.
* lib/egif_lib.c: Remove a debugging statement
2004-05-29 Toshio Kuratomi <toshio@tiki-lounge.com> - r72
* Makefile.am, doc/Makefile.am, pic/Makefile.am: Change wildcarded entries
into explicit filenames so make distcheck will succeed.
2004-05-29 Toshio Kuratomi <toshio@tiki-lounge.com> - r71
* ChangeLog, prop=lastlog: Sync the ChangeLog for the release.
2004-05-29 Toshio Kuratomi <toshio@tiki-lounge.com> - r70
* AUTHORS: Add Lennie Araki to the list of contributers.
* windows: The windows subdirectory and all files under it are contributions
from Lennie Araki to provide a nice interface on MS Windows.
* README: Redundancy fix.
* doc/gif_lib.html: Add EGifPutExtension{First,Next,Last} to the documentation
so people know they should use it instead of EGifPutExtension.
* Makefile.am: Mark the windows files to be distributed.
* NEWS: Complete the NEWS item for 4.1.3.
2004-05-29 Toshio Kuratomi <toshio@tiki-lounge.com> - r69
* libungif.spec: Some updates from the latest RedHat spec.
* configure.ac: Bump version to 4.1.3.
* lib/gifalloc.c: Add to my comments on ESR's note about Extension blocks.
* lib/egif_lib.c:
- EGifPutComment(): reimplemented using EGifPutExtensionFirst, Next, and
Last so that it won't break on unusually long comments.
- EGifPutExtension{First,Next,Last}: Changed fwrites to WRITE so any
user defined write function will get called properly.
- EGifPutExtensionLast: if the Extension block is empty (Zero length)
then don't attempt to output a last extension block, just output the
block terminator.
- EGifPutExtension: Comment that this function does not work when there
are multiple subblocks in an Extension block. Use the functions
EGifPutExtension{First,Next,Last} instead.
- EGifSpew: Reimplement to use EGifPutExtension{First,Next,Last} so we
don't output broken GIFs when there are multiple sub-blocks on an
extension.
* lib/Makefile.am: Bump version to 4.1.3.
* NEWS: Begin writing an entry for 4.1.3.
* util/icon2gif.c: Few casting fixes to make gcc -Wall happy.
* util/gif2ps.c: printf format string corrections.
2004-05-26 Toshio Kuratomi <toshio@tiki-lounge.com> - r67
* Clean up some typos.
2004-05-25 Toshio Kuratomi <toshio@tiki-lounge.com> - r66
* Sync with libungif-4.1.2.
2004-03-03 Toshio Kuratomi <toshio@tiki-lounge.com> - r64
Last minute updates to the release notes in various files.
2004-03-03 Toshio Kuratomi <toshio@tiki-lounge.com> - r63
* Set property lastlog to remind me when I last synced the ChangeLog
2004-03-03 Toshio Kuratomi <toshio@tiki-lounge.com> - r62
* ChangeLog: Update
2004-03-03 Toshio Kuratomi <toshio@tiki-lounge.com> - r61
* configure.ac: Bump version to 4.1.2
2004-02-22 Toshio Kuratomi <toshio@tiki-lounge.com> - r59
* configure.ac, lib/Makefile.am: Bump version. Forgot to do this for 4.1.1...
2004-02-22 Toshio Kuratomi <toshio@tiki-lounge.com> - r58
* TODO: Take out -Wall as that's all ready now.
2004-02-22 Toshio Kuratomi <toshio@tiki-lounge.com> - r57
Merge changes to the code from branch indent-audit r55
* README: MakeExtension deprecation note.
* TODO: Bunch of things I need to fix or check that I saw while doing the
indentation of the code.
* lib/getarg.h: indent changes
* lib/dgif_lib.c: indent changes
- Move stdlib.h out of #ifdef's as it's included on all platforms.
- Add checks to be sure malloc and MakeMapObject succeed.
* lib/quantize.c: indent changes
- Move stdlib.h out of #ifdef's as it's included on all platforms.
- _GifError already pulled in through gif_lib_private.h. Remove decl.
- Make Count in NewColorMapType be unsigned.
- Separated mallocs from conditionals in a few places. Easier reading.
* lib/gifalloc.c: indent changes
- Added four FIXME's where I think the code might not be doing what we
want. Need to do more research to figure out.
- Add note to MakeExtension that I think it needs to be deprecated.
- Separated mallocs from conditionals in a few places. Easier reading.
- FreeLastSavedImage: New private function to free the last image in a
GifFile structure. Used to back out when unable to completely
allocate a new SavedImage structure.
- check for NULL values before deallocating in Free* functions and make
sure all Free* functions set the pointer to NULL after they deallocate
the memory.
* lib/egif_lib.c: indent changes
- EGifPutScreenDesc: If we have no colormap, output a default value for
its size instead of trying to reference its unallocated BitsPerPixel
field. (Fixes bug noted in r46)
* lib/gif_lib.h: indent changes
- Condense the #else #if VARARGS to #elif VARARGS check.
* lib/qprintf.c: indent changes
- Condense the #else #if VARARGS to #elif VARARGS check.
* lib/dev2gif.c: indent changes
* lib/getarg.c: indent changes
* lib/gif_lib_private.h: indent changes
* lib/gif_font.c: indent changes
* lib/gif_err.c: indent changes
2004-02-22 Toshio Kuratomi <toshio@tiki-lounge.com> - r56
* lib/Makefile.am, util/Makefile.am: Add -Wall to the compilation flags so
we can keep the code from acquiring too much bad style.
2004-02-20 Toshio Kuratomi <toshio@tiki-lounge.com> - r46
* egif_lib.c: Note for a bug fix (Can wait until after indent because
there's no patch.)
* gif_lib.h, dev2gif.c: Change int type to explicit long type in
DumpScreen2Gif.
* util/gifinto.c: Give the fprintf back its %d format.
GifFile->ImageCount is used as the Image number.
2004-02-20 Toshio Kuratomi <toshio@tiki-lounge.com> - r45
* README: add varargs to the deprecation list
2004-02-20 Toshio Kuratomi <toshio@tiki-lounge.com> - r44
* test-unx: Quote the program names.
* lib/dgif_lib.c:
- Make sure memory was allocated for the colormap
- Some reformatting of code but no syntactic changes.
* lib/gif_lib.h:
- C++ extern "C" fix
- Fix typo with EGifOpen
* lib/qprintf.c, lib/getarg.c: Update the varargs code. Some users reported
that not all systems can handle the hybridized varargs parameter lists
we had. Need to use old-style declarations instead.
2004-02-20 Toshio Kuratomi <toshio@tiki-lounge.com> - r43
* NEWS: Note bugfixes and deprecations
* README: Deprecation list is now being compiled in this file.
* TODO: Notes about interlace bug, -Wall status, merging of old bug status
2004-02-19 Toshio Kuratomi <toshio@tiki-lounge.com> - r42
* Makefile.am: Disable testing for now because gif2x11 is broken so none
of the tests _appear_ to complete successfully.
2004-02-19 Toshio Kuratomi <toshio@tiki-lounge.com> - r38
Merge -Wall fixes from branches/Wall-audit r29
* configure.ac:
- Make the stdarg vs varargs check simpler by relying on
AC_CHECK_HEADERS() magic.
- Check for unistd.h
* dgif_lib.c, gif_lib.h, egif_lib.c, gifalloc.c, quantize.c, dev2gif.c,
getarg.c, gif_lib_private.h, gif_font.c gif_err.c, gifinto.c, icon2gif.c,
raw2gif.c, gifcolor.c, gifasm.c, gif2epsn.c, gif2iris.c, gifrotat.c,
gifovly.c, gif2x11.c, rle2gif.c, gif2rle.c, text2gif.c, gifspnge.c,
gifclrmp.c, giffiltr.c, giftext.c, gifinfo.c, rgb2gif.c, gif2rgb.c, gif2ps.c
- Changes to get rid of -Wall compile warnings.
+ Casting of types
+ New header includes for unistd.h and fcntl.h
+ Explicit declaration of many types to unsigned
+ Removed unused variables and functions
+ Removed VersionStr from every library file. Instead include it via
gif_lib_private.h
* gif_lib.h, gif_lib_private.h: Moved the VersionStr into gif_lib_private.h
and made it a #define instead of a static char *.
2004-02-19 Toshio Kuratomi <toshio@tiki-lounge.com> - r37
Deprecation notes
2004-02-19 Toshio Kuratomi <toshio@tiki-lounge.com> - r36
Add notes about security things to do and giflib syncing
2004-02-18 Toshio Kuratomi <toshio@tiki-lounge.com> - r32
* TODO: Add notes about how to go about syncing Wall-audit and indent changes
into giflib. It won't be pretty.
* svn:ignore: Change the tarball names from libungif to giflib
2004-02-18 Toshio Kuratomi <toshio@tiki-lounge.com> - r31
Add config.h include to gif_hash.c
2004-02-17 Toshio Kuratomi <toshio@tiki-lounge.com> - r30
Sync up with libungif 4.1.1
2004-02-17 Toshio Kuratomi <toshio@tiki-lounge.com> - r26
Updated ChangeLog
2004-02-17 Toshio Kuratomi <toshio@tiki-lounge.com>
* Updated libungif.spec to look more like fedora core spec
* Updated version numbers in all files
2004-02-17 Toshio Kuratomi <toshio@tiki-lounge.com>
* Add the libungif*.tar.bz2 distribution tarball to the ignored files
* configure.ac, lib/getarg.c, lib/getarg.h, lib/gif_lib.h, lib/qprintf.c:
Prefer stdarg.h over vararg.h
* TODO: Add information about functions that will go away in 5.0
(In reality, I don't think new software uses libungif, so there may never
be a 5.0 release.)
* lib/gif_lib.h: Change version from 4.0 to 4.1
* NEWS: add deprecation warning for the qprintf stuff: GifQuietPrint var and
GifQprintf function.
2004-02-16 Toshio Kuratomi <toshio@tiki-lounge.com>
* util/gif2iris.c, util/gif2rle.c, util/gifinfo.c: Fix problems with fprintf error statements in the utils
2004-02-16 Toshio Kuratomi <toshio@tiki-lounge.com>
Add DEVELOPERS file to the distribution.
2004-02-16 Toshio Kuratomi <toshio@tiki-lounge.com>
* AUTHORS, libungif.spec, libungif.lsm, README, BUGS, NEWS:
Lots of changes to my email address and the website/download. (libungif is
moving to sourceforge.)
* TODO: Few notes on cleanups that need to happen. State what needs to be done
for 4.1.1 to be released.
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com>
Changes imported from last cvs checkout
* TODO: note to check return of malloc everywhere
* lib/dgif_lib.c, lib/egif_lib.c: Fix some deallocation bugs
* lib/gifalloc.c: Fix a colormap allocation problem
* lib/gif_font.c: Fix to drawing text
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com>
Added libgetarg.a to the ignore list.
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com>
Changes to the build infrastructure to build under current libtool, automake,
and libtool.
* configure.in: renamed to configure.ac
* acconfig.h: deleted. Functionality moved into the configure.ac
* autogen.sh: now runs libtoolize --automake
* lib/Makefile.am, util/Makefile.am: CFLAGS=>AM_CFLAGS; INCLUDES=>AM_CPPFLAGS
* configure.ac:
- initialization macros for automake and autoconf have changed
- removed checks for C++ compiler and Awk
- acconfig.h functionality moved here.
- add other X11 libraries to the X11_LIB define
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com>
* Remove INSTALL file as it's autogenerated.\n* Add stamp-h1 to ignored files
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com>
Additional adds and deletes to make version 4.1.0b1
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com>
Import of version 4.1.0b1
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com> - r10
Import giflib 4.1.0
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com> - r9
Copy the 4.1.0 libungif release to be the base of the 4.1.0 giflib release.
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com> - r7
Release 4.1.0
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com> - r6
Import of version 4.1.0
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com> - r5
Set ignore patterns on the project directories.
2004-02-15 Toshio Kuratomi <toshio@tiki-lounge.com> - r3
Remove a Makefile.in that was left in in the first commit.
2004-02-14 Toshio Kuratomi <toshio@tiki-lounge.com> - r2
Commit revision 3.1.0 to subversion
2004-02-14 Toshio Kuratomi <toshio@tiki-lounge.com> - r1
Initial SVN Repository Layout
2000 6 Feb Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* configure.in: Change to using config.h
- Every .c file: Change to using config.h.
* configure.in: added check for varargs header.
* lib/getarg.c: Changed the ifdef USE_VARARGS to ifdef HAVE_VARARGS_H.
- lib/getarg.h: Ditto.
- lib/gif_lib.h: Ditto.
- lib/qprintf.h: Ditto.
2000 6 Feb Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* lib/getarg.h: Prepend an underscore to the header file define.
* lib/gif_lib.h: Ditto
* lib/gif_lib_private.h: Ditto
* lib/getarg.c: ifdef'd MyMalloc so it actually won't define if it already
is.
2000 3 Feb Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* A new cvs repository based my private tree from home. It now goes back
to giflib-3.0.
* Updated the cvs repository to make multiple developers possible.
* Merge all of Michael's patches into the distribution.
* DEVELOPER: Updated to reflect the new versions of
autoconf/automake/libtool we're using.
* libungif.spec: Updated a few things from the latest redhat spec file.
1999 5 Dec Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* Update links to the web pages as I have reorganized them somewhat.
* Add the welcome2.gif to the pic directory and a test that utilizes
it to test-unx.
1999 17 Nov Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* New cvs Repository. Hopefully I've got everything that was in the
old one. This one is available on anonymous cvs.
* Update to libtool 1.3.3, automake 1.4, and autoconf 2.13
1999 23 May Michael R Brown <michael@arrakeen.demon.co.uk>
* Lots of 'const' qualifiers added, thanks Alexis
Wilke for finding these.
1999 22 Mar Michael R Brown <michael@arrakeen.demon.co.uk>
* util/gif2x11.c: Patch by (who?) to fix lots of memory leeks.
* util/*.c:
lib/dgif_lib.c:
Makefile.in:
Patch by David Kaelbling to compile on IRIX 6.x. Basically fixing
lots of bad/missing parameter passing to printf, scanf and similar.
* Added pics/welcome2.gif, from Peter Merz which provokes a bug prior
to patch 19990224 to do with colour map management. There is still
a problem with util/gifspnge processing this image, so it will not
be added to test-unx yet.
1999 05 Mar Michael R Brown <michael@arrakeen.demon.co.uk>
* lib/getarg.c: Lines 107 and 189
Added ifdef's to use stdarg when available. On dec-alpha the
default code was causing programs to crash, probably because
it assumes a stack that grows-up.
1999 24 Feb Michael R Brown <michael@arrakeen.demon.co.uk>
* lib/dgif_lib.c: Lines 363 and 367
Bug reported by Steve Sanders, where &'s where causing the
memcpy to overwrite the pointers. Fixed by removing the &'s
so that memcpy overwrote the memory pointed to.
1999 09 Feb Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* Release 4.1.0
1999 09 Feb Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* Merge libungif changes into the giflib tree:
- upgrade to libtool 1.2b
- util/Makefile.am: Minor change to allow compilation outside the
source_dir.
- lib/egif_lib.c: FILE_STATE_WRITE, FILE_STATE_SCREEN,
FILE_STATE_IMAGE, IS_WRITEABLE are now in gif_lib_private.h
- lib/dgif_lib.c: FILE_STATE_READ and IS_READABLE are now in
gif_lib_private.h
- lib/gif_lib_private.h: Above mentioned constants and macros are now
here. FILE_STATE_READ is now 0x08 instead of 0x00.
- configure.in: Update version to 4.1.0
- lib/Makefile.am: Update libtool version to 5:0:1 (libtool)
- giflib.spec: Update for version 4.1.0 (Add libungif-4.1
compatibility stuff and change version.)
- giflib.lsm: Update for version 4.1.0
- lib/egif_lib.c: (WRITE) change from a function to a macro.
- lib/dgif_lib.c: (DGifOpenFileName) close FileHandle on error.
- lib/dgif_lib.c: (DGifOpenFileHandle) make sure the FILE stream is
closed if we hit an error.
- lib/dev2gif.c, lib/quantize.c, lib/gif_err.c, lib/gif_lib_private.h:
Reflect Eric's copyright notice rather than Gershon's
1999 14 Jan Michael R Brown <michael@arrakeen.demon.co.uk>
* lib/gif_lib.h: Add OutputFunc type
* lib/gif_lib.h: Add EGifOpen for user supplied output function
* lib/egif_lib.c: (EGifOpenFileName) Fixed wasted memory when an
error occurs in EGifOpenFileHandle
* lib/egif_lib.c: Add EGifOpen, WRITE, and lots of changes to
support user supplied output function. Basically changing
all fwrite's to WRITE, and then all of the knock on effects.
1998 17 Dec Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* configure.in: Change references to libungif to giflib.
* libungif.lsm: Rename to giflib.lsm and change to reflect giflib
rather than libungif.
* libungif.spec: Rename to giflib.spec and change to reflect giflib
rather than libungif.
* UNCOMPRESSED_GIF: Removed from this branch.
* PATENT_PROBLEMS: Add file explaining Unisys's patent claims.
* Makefile.am: Replace libungif with giflib.
* README: Adapted language to giflib.
* lib/Makefile.am: Changed references to libungif to libgif.
* util/Makefile.am: Changed references to libungif to libgif.
1998 17 Dec Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* lib/egif_lib.c: Merge LZW stuff into this branch of the library.
This includes numerous changes to initialize the hash table as well
as the code forthe encoder.
* lib/gif_hash.c: Functions needed for the LZW encoder.
* lib/gif_hash.h: Functions needed for the LZW encoder.
* lib/Makefile.am: Add gif_hash.c gif_hash.h to the list of sources.
1998 15 Dec Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* lib/dgif_lib.c: (DGifSlurp) Fix a Seg Fault when an image contains
no extension blocks.
1998 14 Dec Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* configure.in: Update version to 4.0
* lib/Makefile.am: Update libtool version to 4:0:0 (libtool)
* libungif.spec: Update for version 4.0 (not binary compatible with
giflib, change version.)
* lib/gif_lib_private.h: (PrivateType) New header for common stuff
private to the library. Currently, this is only the Private struct.
* lib/dgif_lib.c: (PrivateType) Extract the Private struct to
gif_lib_private.h
* lib/egif_lib.c: (PrivateType) Extract the Private struct to
gif_lib_private.h
* lib/Makefile.am: Add gif_lib_private.h to the list of source files.
* lib/gif_lib.h: (ExtensionBlock) Add a Function entry to the
ExtensionBlock record. Note that this is not entirely correct:
the GifLib ExtensionBlock structure is actually a data sub-block
record. By adding the function entry here, we are pushing the
ExtensionBlockType in with the DataSubBlock.
Sometime in the future, we need to change the API to have true
ExtensionBlocks which have DataSubBlocks belonging to them.
* lib/gif_lib.h: (ExtensionBlock) Deprecate the use of Function in
the SavedImage struct. Use ExtensionBlock's Function instead.
* lib/egif_lib.c: (EGifSpew) Changes to use the new Function variable.
* lib/dgif_lib.c: (DGifSlurp) Changes to put data into the new
Function variable.
1998 3 Dec Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* lib/dgif_lib.c: (DGifSlurp) Three changes:
- No longer allocate SaveImage in this function. All allocations
of SaveImage take place in DGifGetImageDesc.
- Extension blocks are now associated with the Image Block that is
read in subsequent to them, not before. This should now be
conformant to the gif89a specification.
- Fix an off-by-one error when copying extension data from structure
to structure.
* lib/dgif_lib.c: (DGifGetImageDesc) Change the function to do its own
allocation of space for the SavedImage structure no matter what.
* lib/egif_lib.c: (EGifSpew) The function now spits out
ExtensionBlocks before the associated Image Block to conform with
the gif89a specification.
* lib/egif_lib.c: (EGifOpenFileHandle) Move the write of the
GifVersion (gif87a or gif89a) from this function into
EGifPutScreenDesc so that it can be controlled by EGifSpew. Note
that this is still a hack as the GifVersion write doesn't really
belong in either of these functions.
* lib/egif_lib.c: (EGifPutScreenDesc) Moved writing the version
(gif87a or gif89a) into the file into this function from
EGifOpenFileHandle.
* test-unx: Now test the extension code.
* pic/x-trans.gif: New image with Comments and transparency to test
the extension code with.
1998 29 Nov Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* lib/dgif_lib.c: (DGifSlurp) Fix a few of the minor bugs plaguing
this function. At this point, the function should no longer cause
a Seg Fault. It is now losing all extension data however. I know
how to hack a fix in, but I need to commit these changes first.
* lib/dgif_lib.c: (DGifGetImageDesc) Fix my bug fix: the colormap is
now only copied if it exists :-).
1998 10 Nov Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* test-unx: Add a test for DGifSlurp and EGifSpew
1998 14 Oct Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* lib/dgif_lib.c: (DGifGetImageDesc) Fix a bug where the Colormap for
the image description and the SaveImage were pointers to the same
structure, causing a SegV when DGifClosing the file.
1998 9 Oct Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* lib/dgif_lib.c: (DGifSlurp) memory for the extensions was not being
allocated. Now I call AddExtensionBlock when I add an extension to
the structure. Additionally, fix a memory leak here.
* configure.in, NEWS, lib/Makefile.am: Update to version 3.1.1
* ltmain.sh, ltconfig: removed from the cvs repository
* BUGS: add the BUGS file to list unresolved BUGS.
1998 9 Sep Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* libungif.spec: Fix wrong version in %files and %install section.
1998 8 Sep Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* lib/gif_hash.c, lib/gif_hash.h: Removed these because a hash table
is not needed to create uncompressed gifs.
* lib/egif_lib.c: Remove all references to the hash functions.
* lib/Makefile.am: Remove gif_hash.c gif_hash.h from the source files.
* libungif.lsm: added this file
1998 7 Sep Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* lib/dgif_lib.c, lib/gif_lib.h: (DGifOpen) Add callback to read gif
image through user supplied function (Peter Mehlitz).
1998 6 Sep Toshio Kuratomi <badger@prtr-13.ucsc.edu>
* util/*.{gif.rle}: removed files that were left by my testing
process and shouldn't have been in the distribution.
* UNCOMPRESSED_GIF: add section on why software that can decode
LZW compressed gifs (but not write them) is legal.
* .cvsignore: added .cvsignore files to ignore Makefiles and other
generated files in my cvs repository.
* Makefile.am's: Fixes to allow the dist* family of targets to work
correctly. Preliminary support for make check as well.
* configure.in: Update version to 3.1.0
* lib/Makefile.am: Update libtool version to 4:0:1 libtool)
* libungif-3.0.spec: Update from Marc Ewing.
* Add int/pointer Alpha fixes from Dick Porter to many source files.

29
oversampling/WDL/giflib/DEVELOPERS Normal file
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Things to tell developers of libungif....
=======
Build Tools:
libungif presently uses autoconf, automake, and libtool in order to build
shared libraries for a wide variety of platforms. The distributed tarball has
files prebuilt from these tools. The cvs repository does not. If you want to
build libungif you will need to have these tools available. I currently run
with the following versions:
autoconf 2.57
automake 1.7.8
libtool 1.5
(P.S. I use the autogen.sh script in the top level directory to generate
configure, Makefile.in, etc using these tools.)
=======
cvs:
I currently do my work in a subversion repository. Since sourceforge is still
using cvs and not subversion, there's nothing in the sourceforge tree.
If someone else wants to do development we can definitely talk about the best
way to share version control access.
=======
I create the distribution tar ball by using the `make dist` command.... After
hacking all I want, I check my sources into cvs, checkout a clean tree, run
./autogen.sh; make dist and then attempt to compile from the libungif-*.tar.gz
file that is generated.

69
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This is giflib version 4.1.2, a library for manipulating gif files. It is based
on Eric S. Raymond's giflib-3.0 with bugfixes and changes generated for the
libungif library.
PLEASE BE AWARE OF POSSIBLE LEGAL PROBLEMS WITH USING THIS LIBRARY: READ
THE PATENT_PROBLEMS FILE NOW!
=======
Latest versions of giflib, as well as a library which does not have the
mentioned patent problems (libungif), are available from:
http://sourceforge.net/projects/libungif
====
Building this package should be as simple as:
./configure
gmake
gmake install
====
Deprecation list. Will be removed in giflib 5.0:
* GIF_ERROR and GIF_MESSAGE are on the deprecation list as they are also
utility helper functions rather than essential to the functioning of the
library.
* The qprintf methods of the library are now deprecated. Do not use
GifQuietPrint or GifQprintf. These should have been pushed out into the
utility helper library instead of sitting around in the library proper at
the same time as the getarg functions were moved out. Getting rid of these
will let us get rid of our dependence on stdarg.h/varargs.h (Which a Gif
reading library has no business requiring.)
* In the SavedImage struct: int Function will be removed. Use
SavedImage.ExtensionBlocks[x].Function instead.
* In gifalloc.c: MakeExtension is deprecated as well. Use AddExtensionBlock
instead. (This and the previous int Function were deprecated because they
only handle one Extension per image. The new code handles multiple
extensions.)
* varargs style interface in qprintf and getarg: It's a mistake to have two
different interfaces that depend on compile time choices between varargs
and stdargs. The future is to get rid of varargs style altogether.
(Also: these are probably going strictly into the utility functions so
the library won't have to worry about them at all.)
====
I have found that automake currently generates Makefile's containing some
GNUmake specific syntax. If you're having troubles building with your
system provided make, please install GNU make and try rebuilding.
====
This package uses autoconf, automake, and libtool to create the configure
script, so if you need to edit the configure.ac or change a makefile target
you should read the DEVELOPER file for hints on recreating the distribution
using these tools.
Good luck!
-Toshio Kuratomi <toshio@tiki-lounge.com>
==== READ.ME file for giflib version 3.0:
READ ME for GIFLIB
For complete documentation on the package, point a web browser at
doc/index.html. See the file INSTALL for instructions on how to
install and test the package.
GIFLIB has a home page at http://www.ccil.org/~esr/giflib.
Eric S. Raymond
esr@snark.thyrsus.com.
(http://www.ccil.org/~esr)

14
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#ifndef _CONFIG_H_
#define _CONFIG_H_
#ifdef _WIN32
#include <windows.h>
#include <io.h>
#define _OPEN_BINARY
#else
typedef unsigned int UINT32;
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#endif
#include <fcntl.h>
#endif

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oversampling/WDL/giflib/dgif_lib.c Normal file
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/******************************************************************************
* "Gif-Lib" - Yet another gif library.
*
* Written by: Gershon Elber IBM PC Ver 1.1, Aug. 1990
******************************************************************************
* The kernel of the GIF Decoding process can be found here.
******************************************************************************
* History:
* 16 Jun 89 - Version 1.0 by Gershon Elber.
* 3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names).
*****************************************************************************/
#include "config.h"
#include <stdlib.h>
#if defined (__MSDOS__) && !defined(__DJGPP__) && !defined(__GNUC__)
#include <io.h>
#include <alloc.h>
#include <sys\stat.h>
#else
#include <sys/types.h>
#include <sys/stat.h>
#endif /* __MSDOS__ */
#ifdef HAVE_IO_H
#include <io.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif /* HAVE_FCNTL_H */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <stdio.h>
#include <string.h>
#include "gif_lib.h"
#include "gif_lib_private.h"
#define COMMENT_EXT_FUNC_CODE 0xfe /* Extension function code for
comment. */
/* avoid extra function call in case we use fread (TVT) */
#define READ(_gif,_buf,_len) \
(((GifFilePrivateType*)_gif->Private)->Read ? \
((GifFilePrivateType*)_gif->Private)->Read(_gif,_buf,_len) : \
fread(_buf,1,_len,((GifFilePrivateType*)_gif->Private)->File))
static int DGifGetWord(GifFileType *GifFile, GifWord *Word);
static int DGifSetupDecompress(GifFileType *GifFile);
static int DGifDecompressLine(GifFileType *GifFile, GifPixelType *Line,
int LineLen);
static int DGifGetPrefixChar(GifPrefixType *Prefix, int Code, int ClearCode);
static int DGifDecompressInput(GifFileType *GifFile, int *Code);
static int DGifBufferedInput(GifFileType *GifFile, GifByteType *Buf,
GifByteType *NextByte);
#ifndef _GBA_NO_FILEIO
/******************************************************************************
* Open a new gif file for read, given by its name.
* Returns GifFileType pointer dynamically allocated which serves as the gif
* info record. _GifError is cleared if succesfull.
*****************************************************************************/
GifFileType *
DGifOpenFileName(const char *FileName) {
int FileHandle;
GifFileType *GifFile;
if ((FileHandle = open(FileName, O_RDONLY
#if defined(__MSDOS__) || defined(_OPEN_BINARY)
| O_BINARY
#endif /* __MSDOS__ || _OPEN_BINARY */
)) == -1) {
_GifError = D_GIF_ERR_OPEN_FAILED;
return NULL;
}
GifFile = DGifOpenFileHandle(FileHandle);
if (GifFile == (GifFileType *)NULL)
close(FileHandle);
return GifFile;
}
/******************************************************************************
* Update a new gif file, given its file handle.
* Returns GifFileType pointer dynamically allocated which serves as the gif
* info record. _GifError is cleared if succesfull.
*****************************************************************************/
GifFileType *
DGifOpenFileHandle(int FileHandle) {
unsigned char Buf[GIF_STAMP_LEN + 1];
GifFileType *GifFile;
GifFilePrivateType *Private;
FILE *f;
GifFile = (GifFileType *)malloc(sizeof(GifFileType));
if (GifFile == NULL) {
_GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
return NULL;
}
memset(GifFile, '\0', sizeof(GifFileType));
Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType));
if (Private == NULL) {
_GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
free((char *)GifFile);
return NULL;
}
#ifdef __MSDOS__
setmode(FileHandle, O_BINARY); /* Make sure it is in binary mode. */
#endif /* __MSDOS__ */
f = fdopen(FileHandle, "rb"); /* Make it into a stream: */
#ifdef __MSDOS__
setvbuf(f, NULL, _IOFBF, GIF_FILE_BUFFER_SIZE); /* And inc. stream
buffer. */
#endif /* __MSDOS__ */
GifFile->Private = (VoidPtr)Private;
Private->FileHandle = FileHandle;
Private->File = f;
Private->FileState = FILE_STATE_READ;
Private->Read = 0; /* don't use alternate input method (TVT) */
GifFile->UserData = 0; /* TVT */
/* Lets see if this is a GIF file: */
if (READ(GifFile, Buf, GIF_STAMP_LEN) != GIF_STAMP_LEN) {
_GifError = D_GIF_ERR_READ_FAILED;
fclose(f);
free((char *)Private);
free((char *)GifFile);
return NULL;
}
/* The GIF Version number is ignored at this time. Maybe we should do
* something more useful with it. */
Buf[GIF_STAMP_LEN] = 0;
if (strncmp(GIF_STAMP, (char*)Buf, GIF_VERSION_POS) != 0) {
_GifError = D_GIF_ERR_NOT_GIF_FILE;
fclose(f);
free((char *)Private);
free((char *)GifFile);
return NULL;
}
if (DGifGetScreenDesc(GifFile) == GIF_ERROR) {
fclose(f);
free((char *)Private);
free((char *)GifFile);
return NULL;
}
_GifError = 0;
return GifFile;
}
#endif /* _GBA_NO_FILEIO */
/******************************************************************************
* GifFileType constructor with user supplied input function (TVT)
*****************************************************************************/
GifFileType *
DGifOpen(void *userData,
InputFunc readFunc) {
unsigned char Buf[GIF_STAMP_LEN + 1];
GifFileType *GifFile;
GifFilePrivateType *Private;
GifFile = (GifFileType *)malloc(sizeof(GifFileType));
if (GifFile == NULL) {
_GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
return NULL;
}
memset(GifFile, '\0', sizeof(GifFileType));
Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType));
if (!Private) {
_GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
free((char *)GifFile);
return NULL;
}
GifFile->Private = (VoidPtr)Private;
Private->FileHandle = 0;
Private->File = 0;
Private->FileState = FILE_STATE_READ;
Private->Read = readFunc; /* TVT */
GifFile->UserData = userData; /* TVT */
/* Lets see if this is a GIF file: */
if (READ(GifFile, Buf, GIF_STAMP_LEN) != GIF_STAMP_LEN) {
_GifError = D_GIF_ERR_READ_FAILED;
free((char *)Private);
free((char *)GifFile);
return NULL;
}
/* The GIF Version number is ignored at this time. Maybe we should do
* something more useful with it. */
Buf[GIF_STAMP_LEN] = 0;
if (strncmp(GIF_STAMP, (char*)Buf, GIF_VERSION_POS) != 0) {
_GifError = D_GIF_ERR_NOT_GIF_FILE;
free((char *)Private);
free((char *)GifFile);
return NULL;
}
if (DGifGetScreenDesc(GifFile) == GIF_ERROR) {
free((char *)Private);
free((char *)GifFile);
return NULL;
}
_GifError = 0;
return GifFile;
}
/******************************************************************************
* This routine should be called before any other DGif calls. Note that
* this routine is called automatically from DGif file open routines.
*****************************************************************************/
int
DGifGetScreenDesc(GifFileType * GifFile) {
int i, BitsPerPixel;
GifByteType Buf[3];
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_READABLE(Private)) {
/* This file was NOT open for reading: */
_GifError = D_GIF_ERR_NOT_READABLE;
return GIF_ERROR;
}
/* Put the screen descriptor into the file: */
if (DGifGetWord(GifFile, &GifFile->SWidth) == GIF_ERROR ||
DGifGetWord(GifFile, &GifFile->SHeight) == GIF_ERROR)
return GIF_ERROR;
if (READ(GifFile, Buf, 3) != 3) {
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
GifFile->SColorResolution = (((Buf[0] & 0x70) + 1) >> 4) + 1;
BitsPerPixel = (Buf[0] & 0x07) + 1;
GifFile->SBackGroundColor = Buf[1];
if (Buf[0] & 0x80) { /* Do we have global color map? */
GifFile->SColorMap = MakeMapObject(1 << BitsPerPixel, NULL);
if (GifFile->SColorMap == NULL) {
_GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
return GIF_ERROR;
}
/* Get the global color map: */
for (i = 0; i < GifFile->SColorMap->ColorCount; i++) {
if (READ(GifFile, Buf, 3) != 3) {
FreeMapObject(GifFile->SColorMap);
GifFile->SColorMap = NULL;
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
GifFile->SColorMap->Colors[i].Red = Buf[0];
GifFile->SColorMap->Colors[i].Green = Buf[1];
GifFile->SColorMap->Colors[i].Blue = Buf[2];
}
} else {
GifFile->SColorMap = NULL;
}
return GIF_OK;
}
/******************************************************************************
* This routine should be called before any attempt to read an image.
*****************************************************************************/
int
DGifGetRecordType(GifFileType * GifFile,
GifRecordType * Type) {
GifByteType Buf;
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_READABLE(Private)) {
/* This file was NOT open for reading: */
_GifError = D_GIF_ERR_NOT_READABLE;
return GIF_ERROR;
}
if (READ(GifFile, &Buf, 1) != 1) {
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
switch (Buf) {
case ',':
*Type = IMAGE_DESC_RECORD_TYPE;
break;
case '!':
*Type = EXTENSION_RECORD_TYPE;
break;
case ';':
*Type = TERMINATE_RECORD_TYPE;
break;
default:
*Type = UNDEFINED_RECORD_TYPE;
_GifError = D_GIF_ERR_WRONG_RECORD;
return GIF_ERROR;
}
return GIF_OK;
}
/******************************************************************************
* This routine should be called before any attempt to read an image.
* Note it is assumed the Image desc. header (',') has been read.
*****************************************************************************/
int
DGifGetImageDesc(GifFileType * GifFile) {
int i, BitsPerPixel;
GifByteType Buf[3];
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_READABLE(Private)) {
/* This file was NOT open for reading: */
_GifError = D_GIF_ERR_NOT_READABLE;
return GIF_ERROR;
}
if (DGifGetWord(GifFile, &GifFile->Image.Left) == GIF_ERROR ||
DGifGetWord(GifFile, &GifFile->Image.Top) == GIF_ERROR ||
DGifGetWord(GifFile, &GifFile->Image.Width) == GIF_ERROR ||
DGifGetWord(GifFile, &GifFile->Image.Height) == GIF_ERROR)
return GIF_ERROR;
if (READ(GifFile, Buf, 1) != 1) {
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
BitsPerPixel = (Buf[0] & 0x07) + 1;
GifFile->Image.Interlace = (Buf[0] & 0x40);
if (Buf[0] & 0x80) { /* Does this image have local color map? */
if (GifFile->Image.ColorMap)
FreeMapObject(GifFile->Image.ColorMap);
GifFile->Image.ColorMap = MakeMapObject(1 << BitsPerPixel, NULL);
if (GifFile->Image.ColorMap == NULL) {
_GifError = D_GIF_ERR_NOT_ENOUGH_MEM;
return GIF_ERROR;
}
/* Get the image local color map: */
for (i = 0; i < GifFile->Image.ColorMap->ColorCount; i++) {
if (READ(GifFile, Buf, 3) != 3) {
FreeMapObject(GifFile->Image.ColorMap);
_GifError = D_GIF_ERR_READ_FAILED;
GifFile->Image.ColorMap = NULL;
return GIF_ERROR;
}
GifFile->Image.ColorMap->Colors[i].Red = Buf[0];
GifFile->Image.ColorMap->Colors[i].Green = Buf[1];
GifFile->Image.ColorMap->Colors[i].Blue = Buf[2];
}
} else if (GifFile->Image.ColorMap) {
FreeMapObject(GifFile->Image.ColorMap);
GifFile->Image.ColorMap = NULL;
}
GifFile->ImageCount++;
Private->PixelCount = (long)GifFile->Image.Width *
(long)GifFile->Image.Height;
DGifSetupDecompress(GifFile); /* Reset decompress algorithm parameters. */
return GIF_OK;
}
/******************************************************************************
* Get one full scanned line (Line) of length LineLen from GIF file.
*****************************************************************************/
int
DGifGetLine(GifFileType * GifFile,
GifPixelType * Line,
int LineLen) {
GifByteType *Dummy;
GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
if (!IS_READABLE(Private)) {
/* This file was NOT open for reading: */
_GifError = D_GIF_ERR_NOT_READABLE;
return GIF_ERROR;
}
if (!LineLen)
LineLen = GifFile->Image.Width;
#if defined(__MSDOS__) || defined(__GNUC__)
if ((Private->PixelCount -= LineLen) > 0xffff0000UL) {
#else
if ((Private->PixelCount -= LineLen) > 0xffff0000) {
#endif /* __MSDOS__ */
_GifError = D_GIF_ERR_DATA_TOO_BIG;
return GIF_ERROR;
}
if (DGifDecompressLine(GifFile, Line, LineLen) == GIF_OK) {
if (Private->PixelCount == 0) {
/* We probably would not be called any more, so lets clean
* everything before we return: need to flush out all rest of
* image until empty block (size 0) detected. We use GetCodeNext. */
do
if (DGifGetCodeNext(GifFile, &Dummy) == GIF_ERROR)
return GIF_ERROR;
while (Dummy != NULL) ;
}
return GIF_OK;
} else
return GIF_ERROR;
}
/******************************************************************************
* Put one pixel (Pixel) into GIF file.
*****************************************************************************/
int
DGifGetPixel(GifFileType * GifFile,
GifPixelType Pixel) {
GifByteType *Dummy;
GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
if (!IS_READABLE(Private)) {
/* This file was NOT open for reading: */
_GifError = D_GIF_ERR_NOT_READABLE;
return GIF_ERROR;
}
#if defined(__MSDOS__) || defined(__GNUC__)
if (--Private->PixelCount > 0xffff0000UL)
#else
if (--Private->PixelCount > 0xffff0000)
#endif /* __MSDOS__ */
{
_GifError = D_GIF_ERR_DATA_TOO_BIG;
return GIF_ERROR;
}
if (DGifDecompressLine(GifFile, &Pixel, 1) == GIF_OK) {
if (Private->PixelCount == 0) {
/* We probably would not be called any more, so lets clean
* everything before we return: need to flush out all rest of
* image until empty block (size 0) detected. We use GetCodeNext. */
do
if (DGifGetCodeNext(GifFile, &Dummy) == GIF_ERROR)
return GIF_ERROR;
while (Dummy != NULL) ;
}
return GIF_OK;
} else
return GIF_ERROR;
}
/******************************************************************************
* Get an extension block (see GIF manual) from gif file. This routine only
* returns the first data block, and DGifGetExtensionNext should be called
* after this one until NULL extension is returned.
* The Extension should NOT be freed by the user (not dynamically allocated).
* Note it is assumed the Extension desc. header ('!') has been read.
*****************************************************************************/
int
DGifGetExtension(GifFileType * GifFile,
int *ExtCode,
GifByteType ** Extension) {
GifByteType Buf;
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_READABLE(Private)) {
/* This file was NOT open for reading: */
_GifError = D_GIF_ERR_NOT_READABLE;
return GIF_ERROR;
}
if (READ(GifFile, &Buf, 1) != 1) {
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
*ExtCode = Buf;
return DGifGetExtensionNext(GifFile, Extension);
}
/******************************************************************************
* Get a following extension block (see GIF manual) from gif file. This
* routine should be called until NULL Extension is returned.
* The Extension should NOT be freed by the user (not dynamically allocated).
*****************************************************************************/
int
DGifGetExtensionNext(GifFileType * GifFile,
GifByteType ** Extension) {
GifByteType Buf;
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (READ(GifFile, &Buf, 1) != 1) {
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
if (Buf > 0) {
*Extension = Private->Buf; /* Use private unused buffer. */
(*Extension)[0] = Buf; /* Pascal strings notation (pos. 0 is len.). */
if (READ(GifFile, &((*Extension)[1]), Buf) != Buf) {
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
} else
*Extension = NULL;
return GIF_OK;
}
/******************************************************************************
* This routine should be called last, to close the GIF file.
*****************************************************************************/
int
DGifCloseFile(GifFileType * GifFile) {
GifFilePrivateType *Private;
FILE *File;
if (GifFile == NULL)
return GIF_ERROR;
Private = (GifFilePrivateType *) GifFile->Private;
if (!IS_READABLE(Private)) {
/* This file was NOT open for reading: */
_GifError = D_GIF_ERR_NOT_READABLE;
return GIF_ERROR;
}
File = Private->File;
if (GifFile->Image.ColorMap) {
FreeMapObject(GifFile->Image.ColorMap);
GifFile->Image.ColorMap = NULL;
}
if (GifFile->SColorMap) {
FreeMapObject(GifFile->SColorMap);
GifFile->SColorMap = NULL;
}
if (Private) {
free((char *)Private);
Private = NULL;
}
free(GifFile);
if (File && (fclose(File) != 0)) {
_GifError = D_GIF_ERR_CLOSE_FAILED;
return GIF_ERROR;
}
return GIF_OK;
}
/******************************************************************************
* Get 2 bytes (word) from the given file:
*****************************************************************************/
static int
DGifGetWord(GifFileType * GifFile,
GifWord *Word) {
unsigned char c[2];
if (READ(GifFile, c, 2) != 2) {
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
*Word = (((unsigned int)c[1]) << 8) + c[0];
return GIF_OK;
}
/******************************************************************************
* Get the image code in compressed form. This routine can be called if the
* information needed to be piped out as is. Obviously this is much faster
* than decoding and encoding again. This routine should be followed by calls
* to DGifGetCodeNext, until NULL block is returned.
* The block should NOT be freed by the user (not dynamically allocated).
*****************************************************************************/
int
DGifGetCode(GifFileType * GifFile,
int *CodeSize,
GifByteType ** CodeBlock) {
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_READABLE(Private)) {
/* This file was NOT open for reading: */
_GifError = D_GIF_ERR_NOT_READABLE;
return GIF_ERROR;
}
*CodeSize = Private->BitsPerPixel;
return DGifGetCodeNext(GifFile, CodeBlock);
}
/******************************************************************************
* Continue to get the image code in compressed form. This routine should be
* called until NULL block is returned.
* The block should NOT be freed by the user (not dynamically allocated).
*****************************************************************************/
int
DGifGetCodeNext(GifFileType * GifFile,
GifByteType ** CodeBlock) {
GifByteType Buf;
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (READ(GifFile, &Buf, 1) != 1) {
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
if (Buf > 0) {
*CodeBlock = Private->Buf; /* Use private unused buffer. */
(*CodeBlock)[0] = Buf; /* Pascal strings notation (pos. 0 is len.). */
if (READ(GifFile, &((*CodeBlock)[1]), Buf) != Buf) {
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
} else {
*CodeBlock = NULL;
Private->Buf[0] = 0; /* Make sure the buffer is empty! */
Private->PixelCount = 0; /* And local info. indicate image read. */
}
return GIF_OK;
}
/******************************************************************************
* Setup the LZ decompression for this image:
*****************************************************************************/
static int
DGifSetupDecompress(GifFileType * GifFile) {
int i, BitsPerPixel;
GifByteType CodeSize;
GifPrefixType *Prefix;
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
READ(GifFile, &CodeSize, 1); /* Read Code size from file. */
BitsPerPixel = CodeSize;
Private->Buf[0] = 0; /* Input Buffer empty. */
Private->BitsPerPixel = BitsPerPixel;
Private->ClearCode = (1 << BitsPerPixel);
Private->EOFCode = Private->ClearCode + 1;
Private->RunningCode = Private->EOFCode + 1;
Private->RunningBits = BitsPerPixel + 1; /* Number of bits per code. */
Private->MaxCode1 = 1 << Private->RunningBits; /* Max. code + 1. */
Private->StackPtr = 0; /* No pixels on the pixel stack. */
Private->LastCode = NO_SUCH_CODE;
Private->CrntShiftState = 0; /* No information in CrntShiftDWord. */
Private->CrntShiftDWord = 0;
Prefix = Private->Prefix;
for (i = 0; i <= LZ_MAX_CODE; i++)
Prefix[i] = NO_SUCH_CODE;
return GIF_OK;
}
/******************************************************************************
* The LZ decompression routine:
* This version decompress the given gif file into Line of length LineLen.
* This routine can be called few times (one per scan line, for example), in
* order the complete the whole image.
*****************************************************************************/
static int
DGifDecompressLine(GifFileType * GifFile,
GifPixelType * Line,
int LineLen) {
int i = 0;
int j, CrntCode, EOFCode, ClearCode, CrntPrefix, LastCode, StackPtr;
GifByteType *Stack, *Suffix;
GifPrefixType *Prefix;
GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
StackPtr = Private->StackPtr;
Prefix = Private->Prefix;
Suffix = Private->Suffix;
Stack = Private->Stack;
EOFCode = Private->EOFCode;
ClearCode = Private->ClearCode;
LastCode = Private->LastCode;
if (StackPtr != 0) {
/* Let pop the stack off before continueing to read the gif file: */
while (StackPtr != 0 && i < LineLen)
Line[i++] = Stack[--StackPtr];
}
while (i < LineLen) { /* Decode LineLen items. */
if (DGifDecompressInput(GifFile, &CrntCode) == GIF_ERROR)
return GIF_ERROR;
if (CrntCode == EOFCode) {
/* Note however that usually we will not be here as we will stop
* decoding as soon as we got all the pixel, or EOF code will
* not be read at all, and DGifGetLine/Pixel clean everything. */
if (i != LineLen - 1 || Private->PixelCount != 0) {
_GifError = D_GIF_ERR_EOF_TOO_SOON;
return GIF_ERROR;
}
i++;
} else if (CrntCode == ClearCode) {
/* We need to start over again: */
for (j = 0; j <= LZ_MAX_CODE; j++)
Prefix[j] = NO_SUCH_CODE;
Private->RunningCode = Private->EOFCode + 1;
Private->RunningBits = Private->BitsPerPixel + 1;
Private->MaxCode1 = 1 << Private->RunningBits;
LastCode = Private->LastCode = NO_SUCH_CODE;
} else {
/* Its regular code - if in pixel range simply add it to output
* stream, otherwise trace to codes linked list until the prefix
* is in pixel range: */
if (CrntCode < ClearCode) {
/* This is simple - its pixel scalar, so add it to output: */
Line[i++] = CrntCode;
} else {
/* Its a code to needed to be traced: trace the linked list
* until the prefix is a pixel, while pushing the suffix
* pixels on our stack. If we done, pop the stack in reverse
* (thats what stack is good for!) order to output. */
if (Prefix[CrntCode] == NO_SUCH_CODE) {
/* Only allowed if CrntCode is exactly the running code:
* In that case CrntCode = XXXCode, CrntCode or the
* prefix code is last code and the suffix char is
* exactly the prefix of last code! */
if (CrntCode == Private->RunningCode - 2) {
CrntPrefix = LastCode;
Suffix[Private->RunningCode - 2] =
Stack[StackPtr++] = DGifGetPrefixChar(Prefix,
LastCode,
ClearCode);
} else {
_GifError = D_GIF_ERR_IMAGE_DEFECT;
return GIF_ERROR;
}
} else
CrntPrefix = CrntCode;
/* Now (if image is O.K.) we should not get an NO_SUCH_CODE
* During the trace. As we might loop forever, in case of
* defective image, we count the number of loops we trace
* and stop if we got LZ_MAX_CODE. obviously we can not
* loop more than that. */
j = 0;
while (j++ <= LZ_MAX_CODE &&
CrntPrefix > ClearCode && CrntPrefix <= LZ_MAX_CODE) {
Stack[StackPtr++] = Suffix[CrntPrefix];
CrntPrefix = Prefix[CrntPrefix];
}
if (j >= LZ_MAX_CODE || CrntPrefix > LZ_MAX_CODE) {
_GifError = D_GIF_ERR_IMAGE_DEFECT;
return GIF_ERROR;
}
/* Push the last character on stack: */
Stack[StackPtr++] = CrntPrefix;
/* Now lets pop all the stack into output: */
while (StackPtr != 0 && i < LineLen)
Line[i++] = Stack[--StackPtr];
}
if (LastCode != NO_SUCH_CODE) {
Prefix[Private->RunningCode - 2] = LastCode;
if (CrntCode == Private->RunningCode - 2) {
/* Only allowed if CrntCode is exactly the running code:
* In that case CrntCode = XXXCode, CrntCode or the
* prefix code is last code and the suffix char is
* exactly the prefix of last code! */
Suffix[Private->RunningCode - 2] =
DGifGetPrefixChar(Prefix, LastCode, ClearCode);
} else {
Suffix[Private->RunningCode - 2] =
DGifGetPrefixChar(Prefix, CrntCode, ClearCode);
}
}
LastCode = CrntCode;
}
}
Private->LastCode = LastCode;
Private->StackPtr = StackPtr;
return GIF_OK;
}
/******************************************************************************
* Routine to trace the Prefixes linked list until we get a prefix which is
* not code, but a pixel value (less than ClearCode). Returns that pixel value.
* If image is defective, we might loop here forever, so we limit the loops to
* the maximum possible if image O.k. - LZ_MAX_CODE times.
*****************************************************************************/
static int
DGifGetPrefixChar(GifPrefixType *Prefix,
int Code,
int ClearCode) {
int i = 0;
while (Code > ClearCode && i++ <= LZ_MAX_CODE)
Code = Prefix[Code];
return Code;
}
/******************************************************************************
* Interface for accessing the LZ codes directly. Set Code to the real code
* (12bits), or to -1 if EOF code is returned.
*****************************************************************************/
int
DGifGetLZCodes(GifFileType * GifFile,
int *Code) {
GifByteType *CodeBlock;
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_READABLE(Private)) {
/* This file was NOT open for reading: */
_GifError = D_GIF_ERR_NOT_READABLE;
return GIF_ERROR;
}
if (DGifDecompressInput(GifFile, Code) == GIF_ERROR)
return GIF_ERROR;
if (*Code == Private->EOFCode) {
/* Skip rest of codes (hopefully only NULL terminating block): */
do {
if (DGifGetCodeNext(GifFile, &CodeBlock) == GIF_ERROR)
return GIF_ERROR;
} while (CodeBlock != NULL) ;
*Code = -1;
} else if (*Code == Private->ClearCode) {
/* We need to start over again: */
Private->RunningCode = Private->EOFCode + 1;
Private->RunningBits = Private->BitsPerPixel + 1;
Private->MaxCode1 = 1 << Private->RunningBits;
}
return GIF_OK;
}
/******************************************************************************
* The LZ decompression input routine:
* This routine is responsable for the decompression of the bit stream from
* 8 bits (bytes) packets, into the real codes.
* Returns GIF_OK if read succesfully.
*****************************************************************************/
static int
DGifDecompressInput(GifFileType * GifFile,
int *Code) {
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
GifByteType NextByte;
static unsigned short CodeMasks[] = {
0x0000, 0x0001, 0x0003, 0x0007,
0x000f, 0x001f, 0x003f, 0x007f,
0x00ff, 0x01ff, 0x03ff, 0x07ff,
0x0fff
};
/* The image can't contain more than LZ_BITS per code. */
if (Private->RunningBits > LZ_BITS) {
_GifError = D_GIF_ERR_IMAGE_DEFECT;
return GIF_ERROR;
}
while (Private->CrntShiftState < Private->RunningBits) {
/* Needs to get more bytes from input stream for next code: */
if (DGifBufferedInput(GifFile, Private->Buf, &NextByte) == GIF_ERROR) {
return GIF_ERROR;
}
Private->CrntShiftDWord |=
((unsigned long)NextByte) << Private->CrntShiftState;
Private->CrntShiftState += 8;
}
*Code = Private->CrntShiftDWord & CodeMasks[Private->RunningBits];
Private->CrntShiftDWord >>= Private->RunningBits;
Private->CrntShiftState -= Private->RunningBits;
/* If code cannot fit into RunningBits bits, must raise its size. Note
* however that codes above 4095 are used for special signaling.
* If we're using LZ_BITS bits already and we're at the max code, just
* keep using the table as it is, don't increment Private->RunningCode.
*/
if (Private->RunningCode < LZ_MAX_CODE + 2 &&
++Private->RunningCode > Private->MaxCode1 &&
Private->RunningBits < LZ_BITS) {
Private->MaxCode1 <<= 1;
Private->RunningBits++;
}
return GIF_OK;
}
/******************************************************************************
* This routines read one gif data block at a time and buffers it internally
* so that the decompression routine could access it.
* The routine returns the next byte from its internal buffer (or read next
* block in if buffer empty) and returns GIF_OK if succesful.
*****************************************************************************/
static int
DGifBufferedInput(GifFileType * GifFile,
GifByteType * Buf,
GifByteType * NextByte) {
if (Buf[0] == 0) {
/* Needs to read the next buffer - this one is empty: */
if (READ(GifFile, Buf, 1) != 1) {
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
/* There shouldn't be any empty data blocks here as the LZW spec
* says the LZW termination code should come first. Therefore we
* shouldn't be inside this routine at that point.
*/
if (Buf[0] == 0) {
_GifError = D_GIF_ERR_IMAGE_DEFECT;
return GIF_ERROR;
}
if (READ(GifFile, &Buf[1], Buf[0]) != Buf[0]) {
_GifError = D_GIF_ERR_READ_FAILED;
return GIF_ERROR;
}
*NextByte = Buf[1];
Buf[1] = 2; /* We use now the second place as last char read! */
Buf[0]--;
} else {
*NextByte = Buf[Buf[1]++];
Buf[0]--;
}
return GIF_OK;
}

998
oversampling/WDL/giflib/egif_lib.c Normal file
View File

@@ -0,0 +1,998 @@
/******************************************************************************
* "Gif-Lib" - Yet another gif library.
*
* Written by: Gershon Elber Ver 1.1, Aug. 1990
******************************************************************************
* The kernel of the GIF Encoding process can be found here.
******************************************************************************
* History:
* 14 Jun 89 - Version 1.0 by Gershon Elber.
* 3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names).
* 26 Jun 96 - Version 3.0 by Eric S. Raymond (Full GIF89 support)
*****************************************************************************/
#include "config.h"
/* Find a thirty-two bit int type */
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef __MSDOS__
#include <io.h>
#include <alloc.h>
#include <sys\stat.h>
#else
#include <sys/types.h>
#include <sys/stat.h>
#ifdef R6000
/* FIXME: What is sys/mode.h? Can we substitute a check for this file rather
* than a check based on machine type?
*/
#include <sys/mode.h>
#endif
#endif /* __MSDOS__ */
#ifdef HAVE_IO_H
#include <io.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif /* HAVE_FCNTL_H */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "gif_lib.h"
#include "gif_lib_private.h"
/* #define DEBUG_NO_PREFIX Dump only compressed data. */
/* Masks given codes to BitsPerPixel, to make sure all codes are in range: */
static GifPixelType CodeMask[] = {
0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff
};
static char GifVersionPrefix[GIF_STAMP_LEN + 1] = GIF87_STAMP;
#define WRITE(_gif,_buf,_len) \
(((GifFilePrivateType*)_gif->Private)->Write ? \
((GifFilePrivateType*)_gif->Private)->Write(_gif,_buf,_len) : \
fwrite(_buf, 1, _len, ((GifFilePrivateType*)_gif->Private)->File))
static int EGifPutWord(int Word, GifFileType * GifFile);
static int EGifSetupCompress(GifFileType * GifFile);
static int EGifCompressLine(GifFileType * GifFile, GifPixelType * Line,
int LineLen);
static int EGifCompressOutput(GifFileType * GifFile, int Code);
static int EGifBufferedOutput(GifFileType * GifFile, GifByteType * Buf,
int c);
/******************************************************************************
* Open a new gif file for write, given by its name. If TestExistance then
* if the file exists this routines fails (returns NULL).
* Returns GifFileType pointer dynamically allocated which serves as the gif
* info record. _GifError is cleared if succesfull.
*****************************************************************************/
GifFileType *
EGifOpenFileName(const char *FileName,
int TestExistance) {
int FileHandle;
GifFileType *GifFile;
if (TestExistance)
FileHandle = open(FileName, O_WRONLY | O_CREAT | O_EXCL
#if defined(__MSDOS__) || defined(_WIN32)
| O_BINARY
#endif /* __MSDOS__ */
, 0644 );
else
FileHandle = open(FileName, O_WRONLY | O_CREAT | O_TRUNC
#if defined(__MSDOS__) || defined(_WIN32)
| O_BINARY
#endif /* __MSDOS__ */
, 0644 );
if (FileHandle == -1) {
_GifError = E_GIF_ERR_OPEN_FAILED;
return NULL;
}
GifFile = EGifOpenFileHandle(FileHandle);
if (GifFile == (GifFileType *) NULL)
close(FileHandle);
return GifFile;
}
/******************************************************************************
* Update a new gif file, given its file handle, which must be opened for
* write in binary mode.
* Returns GifFileType pointer dynamically allocated which serves as the gif
* info record. _GifError is cleared if succesfull.
*****************************************************************************/
GifFileType *
EGifOpenFileHandle(int FileHandle) {
GifFileType *GifFile;
GifFilePrivateType *Private;
FILE *f;
GifFile = (GifFileType *) malloc(sizeof(GifFileType));
if (GifFile == NULL) {
_GifError = E_GIF_ERR_NOT_ENOUGH_MEM;
return NULL;
}
memset(GifFile, '\0', sizeof(GifFileType));
Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType));
if (Private == NULL) {
free(GifFile);
_GifError = E_GIF_ERR_NOT_ENOUGH_MEM;
return NULL;
}
if ((Private->HashTable = _InitHashTable()) == NULL) {
free(GifFile);
free(Private);
_GifError = E_GIF_ERR_NOT_ENOUGH_MEM;
return NULL;
}
#ifdef __MSDOS__
setmode(FileHandle, O_BINARY); /* Make sure it is in binary mode. */
#endif /* __MSDOS__ */
f = fdopen(FileHandle, "wb"); /* Make it into a stream: */
#ifdef __MSDOS__
setvbuf(f, NULL, _IOFBF, GIF_FILE_BUFFER_SIZE); /* And inc. stream
* buffer. */
#endif /* __MSDOS__ */
GifFile->Private = (VoidPtr)Private;
Private->FileHandle = FileHandle;
Private->File = f;
Private->FileState = FILE_STATE_WRITE;
Private->Write = (OutputFunc) 0; /* No user write routine (MRB) */
GifFile->UserData = (VoidPtr) 0; /* No user write handle (MRB) */
_GifError = 0;
return GifFile;
}
/******************************************************************************
* Output constructor that takes user supplied output function.
* Basically just a copy of EGifOpenFileHandle. (MRB)
*****************************************************************************/
GifFileType *
EGifOpen(void *userData,
OutputFunc writeFunc) {
GifFileType *GifFile;
GifFilePrivateType *Private;
GifFile = (GifFileType *)malloc(sizeof(GifFileType));
if (GifFile == NULL) {
_GifError = E_GIF_ERR_NOT_ENOUGH_MEM;
return NULL;
}
memset(GifFile, '\0', sizeof(GifFileType));
Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType));
if (Private == NULL) {
free(GifFile);
_GifError = E_GIF_ERR_NOT_ENOUGH_MEM;
return NULL;
}
Private->HashTable = _InitHashTable();
if (Private->HashTable == NULL) {
free (GifFile);
free (Private);
_GifError = E_GIF_ERR_NOT_ENOUGH_MEM;
return NULL;
}
GifFile->Private = (VoidPtr) Private;
Private->FileHandle = 0;
Private->File = (FILE *) 0;
Private->FileState = FILE_STATE_WRITE;
Private->Write = writeFunc; /* User write routine (MRB) */
GifFile->UserData = userData; /* User write handle (MRB) */
_GifError = 0;
return GifFile;
}
/******************************************************************************
* Routine to set current GIF version. All files open for write will be
* using this version until next call to this routine. Version consists of
* 3 characters as "87a" or "89a". No test is made to validate the version.
*****************************************************************************/
void
EGifSetGifVersion(const char *Version) {
strncpy(GifVersionPrefix + GIF_VERSION_POS, Version, 3);
}
/******************************************************************************
* This routine should be called before any other EGif calls, immediately
* follows the GIF file openning.
*****************************************************************************/
int
EGifPutScreenDesc(GifFileType * GifFile,
int Width,
int Height,
int ColorRes,
int BackGround,
const ColorMapObject * ColorMap) {
int i;
GifByteType Buf[3];
GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
if (Private->FileState & FILE_STATE_SCREEN) {
/* If already has screen descriptor - something is wrong! */
_GifError = E_GIF_ERR_HAS_SCRN_DSCR;
return GIF_ERROR;
}
if (!IS_WRITEABLE(Private)) {
/* This file was NOT open for writing: */
_GifError = E_GIF_ERR_NOT_WRITEABLE;
return GIF_ERROR;
}
/* First write the version prefix into the file. */
#ifndef DEBUG_NO_PREFIX
if (WRITE(GifFile, (unsigned char *)GifVersionPrefix,
strlen(GifVersionPrefix)) != strlen(GifVersionPrefix)) {
_GifError = E_GIF_ERR_WRITE_FAILED;
return GIF_ERROR;
}
#endif /* DEBUG_NO_PREFIX */
GifFile->SWidth = Width;
GifFile->SHeight = Height;
GifFile->SColorResolution = ColorRes;
GifFile->SBackGroundColor = BackGround;
if (ColorMap) {
GifFile->SColorMap = MakeMapObject(ColorMap->ColorCount,
ColorMap->Colors);
if (GifFile->SColorMap == NULL) {
_GifError = E_GIF_ERR_NOT_ENOUGH_MEM;
return GIF_ERROR;
}
} else
GifFile->SColorMap = NULL;
/*
* Put the logical screen descriptor into the file:
*/
/* Logical Screen Descriptor: Dimensions */
EGifPutWord(Width, GifFile);
EGifPutWord(Height, GifFile);
/* Logical Screen Descriptor: Packed Fields */
/* Note: We have actual size of the color table default to the largest
* possible size (7+1 == 8 bits) because the decoder can use it to decide
* how to display the files.
*/
Buf[0] = (ColorMap ? 0x80 : 0x00) | /* Yes/no global colormap */
((ColorRes - 1) << 4) | /* Bits allocated to each primary color */
(ColorMap ? ColorMap->BitsPerPixel - 1 : 0x07 ); /* Actual size of the
color table. */
Buf[1] = BackGround; /* Index into the ColorTable for background color */
Buf[2] = 0; /* Pixel Aspect Ratio */
#ifndef DEBUG_NO_PREFIX
WRITE(GifFile, Buf, 3);
#endif /* DEBUG_NO_PREFIX */
/* If we have Global color map - dump it also: */
#ifndef DEBUG_NO_PREFIX
if (ColorMap != NULL)
for (i = 0; i < ColorMap->ColorCount; i++) {
/* Put the ColorMap out also: */
Buf[0] = ColorMap->Colors[i].Red;
Buf[1] = ColorMap->Colors[i].Green;
Buf[2] = ColorMap->Colors[i].Blue;
if (WRITE(GifFile, Buf, 3) != 3) {
_GifError = E_GIF_ERR_WRITE_FAILED;
return GIF_ERROR;
}
}
#endif /* DEBUG_NO_PREFIX */
/* Mark this file as has screen descriptor, and no pixel written yet: */
Private->FileState |= FILE_STATE_SCREEN;
return GIF_OK;
}
/******************************************************************************
* This routine should be called before any attempt to dump an image - any
* call to any of the pixel dump routines.
*****************************************************************************/
int
EGifPutImageDesc(GifFileType * GifFile,
int Left,
int Top,
int Width,
int Height,
int Interlace,
const ColorMapObject * ColorMap) {
int i;
GifByteType Buf[3];
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (Private->FileState & FILE_STATE_IMAGE &&
#if defined(__MSDOS__) || defined(__GNUC__)
Private->PixelCount > 0xffff0000UL) {
#else
Private->PixelCount > 0xffff0000) {
#endif /* __MSDOS__ */
/* If already has active image descriptor - something is wrong! */
_GifError = E_GIF_ERR_HAS_IMAG_DSCR;
return GIF_ERROR;
}
if (!IS_WRITEABLE(Private)) {
/* This file was NOT open for writing: */
_GifError = E_GIF_ERR_NOT_WRITEABLE;
return GIF_ERROR;
}
GifFile->Image.Left = Left;
GifFile->Image.Top = Top;
GifFile->Image.Width = Width;
GifFile->Image.Height = Height;
GifFile->Image.Interlace = Interlace;
if (ColorMap) {
GifFile->Image.ColorMap = MakeMapObject(ColorMap->ColorCount,
ColorMap->Colors);
if (GifFile->Image.ColorMap == NULL) {
_GifError = E_GIF_ERR_NOT_ENOUGH_MEM;
return GIF_ERROR;
}
} else {
GifFile->Image.ColorMap = NULL;
}
/* Put the image descriptor into the file: */
Buf[0] = ','; /* Image seperator character. */
#ifndef DEBUG_NO_PREFIX
WRITE(GifFile, Buf, 1);
#endif /* DEBUG_NO_PREFIX */
EGifPutWord(Left, GifFile);
EGifPutWord(Top, GifFile);
EGifPutWord(Width, GifFile);
EGifPutWord(Height, GifFile);
Buf[0] = (ColorMap ? 0x80 : 0x00) |
(Interlace ? 0x40 : 0x00) |
(ColorMap ? ColorMap->BitsPerPixel - 1 : 0);
#ifndef DEBUG_NO_PREFIX
WRITE(GifFile, Buf, 1);
#endif /* DEBUG_NO_PREFIX */
/* If we have Global color map - dump it also: */
#ifndef DEBUG_NO_PREFIX
if (ColorMap != NULL)
for (i = 0; i < ColorMap->ColorCount; i++) {
/* Put the ColorMap out also: */
Buf[0] = ColorMap->Colors[i].Red;
Buf[1] = ColorMap->Colors[i].Green;
Buf[2] = ColorMap->Colors[i].Blue;
if (WRITE(GifFile, Buf, 3) != 3) {
_GifError = E_GIF_ERR_WRITE_FAILED;
return GIF_ERROR;
}
}
#endif /* DEBUG_NO_PREFIX */
if (GifFile->SColorMap == NULL && GifFile->Image.ColorMap == NULL) {
_GifError = E_GIF_ERR_NO_COLOR_MAP;
return GIF_ERROR;
}
/* Mark this file as has screen descriptor: */
Private->FileState |= FILE_STATE_IMAGE;
Private->PixelCount = (long)Width *(long)Height;
EGifSetupCompress(GifFile); /* Reset compress algorithm parameters. */
return GIF_OK;
}
/******************************************************************************
* Put one full scanned line (Line) of length LineLen into GIF file.
*****************************************************************************/
int
EGifPutLine(GifFileType * GifFile,
GifPixelType * Line,
int LineLen) {
int i;
GifPixelType Mask;
GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
if (!IS_WRITEABLE(Private)) {
/* This file was NOT open for writing: */
_GifError = E_GIF_ERR_NOT_WRITEABLE;
return GIF_ERROR;
}
if (!LineLen)
LineLen = GifFile->Image.Width;
if (Private->PixelCount < (unsigned)LineLen) {
_GifError = E_GIF_ERR_DATA_TOO_BIG;
return GIF_ERROR;
}
Private->PixelCount -= LineLen;
/* Make sure the codes are not out of bit range, as we might generate
* wrong code (because of overflow when we combine them) in this case: */
Mask = CodeMask[Private->BitsPerPixel];
for (i = 0; i < LineLen; i++)
Line[i] &= Mask;
return EGifCompressLine(GifFile, Line, LineLen);
}
/******************************************************************************
* Put one pixel (Pixel) into GIF file.
*****************************************************************************/
int
EGifPutPixel(GifFileType * GifFile,
GifPixelType Pixel) {
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_WRITEABLE(Private)) {
/* This file was NOT open for writing: */
_GifError = E_GIF_ERR_NOT_WRITEABLE;
return GIF_ERROR;
}
if (Private->PixelCount == 0) {
_GifError = E_GIF_ERR_DATA_TOO_BIG;
return GIF_ERROR;
}
--Private->PixelCount;
/* Make sure the code is not out of bit range, as we might generate
* wrong code (because of overflow when we combine them) in this case: */
Pixel &= CodeMask[Private->BitsPerPixel];
return EGifCompressLine(GifFile, &Pixel, 1);
}
/******************************************************************************
* Put a comment into GIF file using the GIF89 comment extension block.
*****************************************************************************/
int
EGifPutComment(GifFileType * GifFile,
const char *Comment) {
unsigned int length = strlen(Comment);
char *buf;
length = strlen(Comment);
if (length <= 255) {
return EGifPutExtension(GifFile, COMMENT_EXT_FUNC_CODE,
length, Comment);
} else {
buf = (char *)Comment;
if (EGifPutExtensionFirst(GifFile, COMMENT_EXT_FUNC_CODE, 255, buf)
== GIF_ERROR) {
return GIF_ERROR;
}
length -= 255;
buf = buf + 255;
/* Break the comment into 255 byte sub blocks */
while (length > 255) {
if (EGifPutExtensionNext(GifFile, 0, 255, buf) == GIF_ERROR) {
return GIF_ERROR;
}
buf = buf + 255;
length -= 255;
}
/* Output any partial block and the clear code. */
if (length > 0) {
if (EGifPutExtensionLast(GifFile, 0, length, buf) == GIF_ERROR) {
return GIF_ERROR;
}
} else {
if (EGifPutExtensionLast(GifFile, 0, 0, NULL) == GIF_ERROR) {
return GIF_ERROR;
}
}
}
return GIF_OK;
}
/******************************************************************************
* Put a first extension block (see GIF manual) into gif file. Here more
* extensions can be dumped using EGifPutExtensionNext until
* EGifPutExtensionLast is invoked.
*****************************************************************************/
int
EGifPutExtensionFirst(GifFileType * GifFile,
int ExtCode,
int ExtLen,
const VoidPtr Extension) {
GifByteType Buf[3];
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_WRITEABLE(Private)) {
/* This file was NOT open for writing: */
_GifError = E_GIF_ERR_NOT_WRITEABLE;
return GIF_ERROR;
}
if (ExtCode == 0) {
WRITE(GifFile, (GifByteType *)&ExtLen, 1);
} else {
Buf[0] = '!';
Buf[1] = ExtCode;
Buf[2] = ExtLen;
WRITE(GifFile, Buf, 3);
}
WRITE(GifFile, Extension, ExtLen);
return GIF_OK;
}
/******************************************************************************
* Put a middle extension block (see GIF manual) into gif file.
*****************************************************************************/
int
EGifPutExtensionNext(GifFileType * GifFile,
int ExtCode,
int ExtLen,
const VoidPtr Extension) {
GifByteType Buf;
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_WRITEABLE(Private)) {
/* This file was NOT open for writing: */
_GifError = E_GIF_ERR_NOT_WRITEABLE;
return GIF_ERROR;
}
Buf = ExtLen;
WRITE(GifFile, &Buf, 1);
WRITE(GifFile, Extension, ExtLen);
return GIF_OK;
}
/******************************************************************************
* Put a last extension block (see GIF manual) into gif file.
*****************************************************************************/
int
EGifPutExtensionLast(GifFileType * GifFile,
int ExtCode,
int ExtLen,
const VoidPtr Extension) {
GifByteType Buf;
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_WRITEABLE(Private)) {
/* This file was NOT open for writing: */
_GifError = E_GIF_ERR_NOT_WRITEABLE;
return GIF_ERROR;
}
/* If we are given an extension sub-block output it now. */
if (ExtLen > 0) {
Buf = ExtLen;
WRITE(GifFile, &Buf, 1);
WRITE(GifFile, Extension, ExtLen);
}
/* Write the block terminator */
Buf = 0;
WRITE(GifFile, &Buf, 1);
return GIF_OK;
}
/******************************************************************************
* Put an extension block (see GIF manual) into gif file.
* Warning: This function is only useful for Extension blocks that have at
* most one subblock. Extensions with more than one subblock need to use the
* EGifPutExtension{First,Next,Last} functions instead.
*****************************************************************************/
int
EGifPutExtension(GifFileType * GifFile,
int ExtCode,
int ExtLen,
const VoidPtr Extension) {
GifByteType Buf[3];
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_WRITEABLE(Private)) {
/* This file was NOT open for writing: */
_GifError = E_GIF_ERR_NOT_WRITEABLE;
return GIF_ERROR;
}
if (ExtCode == 0)
WRITE(GifFile, (GifByteType *)&ExtLen, 1);
else {
Buf[0] = '!'; /* Extension Introducer 0x21 */
Buf[1] = ExtCode; /* Extension Label */
Buf[2] = ExtLen; /* Extension length */
WRITE(GifFile, Buf, ExtCode==0xff ? 2 : 3);
}
WRITE(GifFile, Extension, ExtLen);
Buf[0] = 0;
WRITE(GifFile, Buf, 1);
return GIF_OK;
}
/******************************************************************************
* Put the image code in compressed form. This routine can be called if the
* information needed to be piped out as is. Obviously this is much faster
* than decoding and encoding again. This routine should be followed by calls
* to EGifPutCodeNext, until NULL block is given.
* The block should NOT be freed by the user (not dynamically allocated).
*****************************************************************************/
int
EGifPutCode(GifFileType * GifFile,
int CodeSize,
const GifByteType * CodeBlock) {
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (!IS_WRITEABLE(Private)) {
/* This file was NOT open for writing: */
_GifError = E_GIF_ERR_NOT_WRITEABLE;
return GIF_ERROR;
}
/* No need to dump code size as Compression set up does any for us: */
/*
* Buf = CodeSize;
* if (WRITE(GifFile, &Buf, 1) != 1) {
* _GifError = E_GIF_ERR_WRITE_FAILED;
* return GIF_ERROR;
* }
*/
return EGifPutCodeNext(GifFile, CodeBlock);
}
/******************************************************************************
* Continue to put the image code in compressed form. This routine should be
* called with blocks of code as read via DGifGetCode/DGifGetCodeNext. If
* given buffer pointer is NULL, empty block is written to mark end of code.
*****************************************************************************/
int
EGifPutCodeNext(GifFileType * GifFile,
const GifByteType * CodeBlock) {
GifByteType Buf;
GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
if (CodeBlock != NULL) {
if (WRITE(GifFile, CodeBlock, CodeBlock[0] + 1)
!= (unsigned)(CodeBlock[0] + 1)) {
_GifError = E_GIF_ERR_WRITE_FAILED;
return GIF_ERROR;
}
} else {
Buf = 0;
if (WRITE(GifFile, &Buf, 1) != 1) {
_GifError = E_GIF_ERR_WRITE_FAILED;
return GIF_ERROR;
}
Private->PixelCount = 0; /* And local info. indicate image read. */
}
return GIF_OK;
}
/******************************************************************************
* This routine should be called last, to close GIF file.
*****************************************************************************/
int
EGifCloseFile(GifFileType * GifFile) {
GifByteType Buf;
GifFilePrivateType *Private;
FILE *File;
if (GifFile == NULL)
return GIF_ERROR;
Private = (GifFilePrivateType *) GifFile->Private;
if (!IS_WRITEABLE(Private)) {
/* This file was NOT open for writing: */
_GifError = E_GIF_ERR_NOT_WRITEABLE;
return GIF_ERROR;
}
File = Private->File;
Buf = ';';
WRITE(GifFile, &Buf, 1);
if (GifFile->Image.ColorMap) {
FreeMapObject(GifFile->Image.ColorMap);
GifFile->Image.ColorMap = NULL;
}
if (GifFile->SColorMap) {
FreeMapObject(GifFile->SColorMap);
GifFile->SColorMap = NULL;
}
if (Private) {
if (Private->HashTable) {
free((char *) Private->HashTable);
}
free((char *) Private);
}
free(GifFile);
if (File && fclose(File) != 0) {
_GifError = E_GIF_ERR_CLOSE_FAILED;
return GIF_ERROR;
}
return GIF_OK;
}
/******************************************************************************
* Put 2 bytes (word) into the given file:
*****************************************************************************/
static int
EGifPutWord(int Word,
GifFileType * GifFile) {
unsigned char c[2];
c[0] = Word & 0xff;
c[1] = (Word >> 8) & 0xff;
#ifndef DEBUG_NO_PREFIX
if (WRITE(GifFile, c, 2) == 2)
return GIF_OK;
else
return GIF_ERROR;
#else
return GIF_OK;
#endif /* DEBUG_NO_PREFIX */
}
/******************************************************************************
* Setup the LZ compression for this image:
*****************************************************************************/
static int
EGifSetupCompress(GifFileType * GifFile) {
int BitsPerPixel;
GifByteType Buf;
GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
/* Test and see what color map to use, and from it # bits per pixel: */
if (GifFile->Image.ColorMap)
BitsPerPixel = GifFile->Image.ColorMap->BitsPerPixel;
else if (GifFile->SColorMap)
BitsPerPixel = GifFile->SColorMap->BitsPerPixel;
else {
_GifError = E_GIF_ERR_NO_COLOR_MAP;
return GIF_ERROR;
}
Buf = BitsPerPixel = (BitsPerPixel < 2 ? 2 : BitsPerPixel);
WRITE(GifFile, &Buf, 1); /* Write the Code size to file. */
Private->Buf[0] = 0; /* Nothing was output yet. */
Private->BitsPerPixel = BitsPerPixel;
Private->ClearCode = (1 << BitsPerPixel);
Private->EOFCode = Private->ClearCode + 1;
Private->RunningCode = Private->EOFCode + 1;
Private->RunningBits = BitsPerPixel + 1; /* Number of bits per code. */
Private->MaxCode1 = 1 << Private->RunningBits; /* Max. code + 1. */
Private->CrntCode = FIRST_CODE; /* Signal that this is first one! */
Private->CrntShiftState = 0; /* No information in CrntShiftDWord. */
Private->CrntShiftDWord = 0;
/* Clear hash table and send Clear to make sure the decoder do the same. */
_ClearHashTable(Private->HashTable);
if (EGifCompressOutput(GifFile, Private->ClearCode) == GIF_ERROR) {
_GifError = E_GIF_ERR_DISK_IS_FULL;
return GIF_ERROR;
}
return GIF_OK;
}
/******************************************************************************
* The LZ compression routine:
* This version compresses the given buffer Line of length LineLen.
* This routine can be called a few times (one per scan line, for example), in
* order to complete the whole image.
******************************************************************************/
static int
EGifCompressLine(GifFileType * GifFile,
GifPixelType * Line,
int LineLen) {
int i = 0, CrntCode, NewCode;
unsigned long NewKey;
GifPixelType Pixel;
GifHashTableType *HashTable;
GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
HashTable = Private->HashTable;
if (Private->CrntCode == FIRST_CODE) /* Its first time! */
CrntCode = Line[i++];
else
CrntCode = Private->CrntCode; /* Get last code in compression. */
while (i < LineLen) { /* Decode LineLen items. */
Pixel = Line[i++]; /* Get next pixel from stream. */
/* Form a new unique key to search hash table for the code combines
* CrntCode as Prefix string with Pixel as postfix char.
*/
NewKey = (((UINT32) CrntCode) << 8) + Pixel;
if ((NewCode = _ExistsHashTable(HashTable, NewKey)) >= 0) {
/* This Key is already there, or the string is old one, so
* simple take new code as our CrntCode:
*/
CrntCode = NewCode;
} else {
/* Put it in hash table, output the prefix code, and make our
* CrntCode equal to Pixel.
*/
if (EGifCompressOutput(GifFile, CrntCode) == GIF_ERROR) {
_GifError = E_GIF_ERR_DISK_IS_FULL;
return GIF_ERROR;
}
CrntCode = Pixel;
/* If however the HashTable if full, we send a clear first and
* Clear the hash table.
*/
if (Private->RunningCode >= LZ_MAX_CODE) {
/* Time to do some clearance: */
if (EGifCompressOutput(GifFile, Private->ClearCode)
== GIF_ERROR) {
_GifError = E_GIF_ERR_DISK_IS_FULL;
return GIF_ERROR;
}
Private->RunningCode = Private->EOFCode + 1;
Private->RunningBits = Private->BitsPerPixel + 1;
Private->MaxCode1 = 1 << Private->RunningBits;
_ClearHashTable(HashTable);
} else {
/* Put this unique key with its relative Code in hash table: */
_InsertHashTable(HashTable, NewKey, Private->RunningCode++);
}
}
}
/* Preserve the current state of the compression algorithm: */
Private->CrntCode = CrntCode;
if (Private->PixelCount == 0) {
/* We are done - output last Code and flush output buffers: */
if (EGifCompressOutput(GifFile, CrntCode) == GIF_ERROR) {
_GifError = E_GIF_ERR_DISK_IS_FULL;
return GIF_ERROR;
}
if (EGifCompressOutput(GifFile, Private->EOFCode) == GIF_ERROR) {
_GifError = E_GIF_ERR_DISK_IS_FULL;
return GIF_ERROR;
}
if (EGifCompressOutput(GifFile, FLUSH_OUTPUT) == GIF_ERROR) {
_GifError = E_GIF_ERR_DISK_IS_FULL;
return GIF_ERROR;
}
}
return GIF_OK;
}
/******************************************************************************
* The LZ compression output routine:
* This routine is responsible for the compression of the bit stream into
* 8 bits (bytes) packets.
* Returns GIF_OK if written succesfully.
*****************************************************************************/
static int
EGifCompressOutput(GifFileType * GifFile,
int Code) {
GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
int retval = GIF_OK;
if (Code == FLUSH_OUTPUT) {
while (Private->CrntShiftState > 0) {
/* Get Rid of what is left in DWord, and flush it. */
if (EGifBufferedOutput(GifFile, Private->Buf,
Private->CrntShiftDWord & 0xff) == GIF_ERROR)
retval = GIF_ERROR;
Private->CrntShiftDWord >>= 8;
Private->CrntShiftState -= 8;
}
Private->CrntShiftState = 0; /* For next time. */
if (EGifBufferedOutput(GifFile, Private->Buf,
FLUSH_OUTPUT) == GIF_ERROR)
retval = GIF_ERROR;
} else {
Private->CrntShiftDWord |= ((long)Code) << Private->CrntShiftState;
Private->CrntShiftState += Private->RunningBits;
while (Private->CrntShiftState >= 8) {
/* Dump out full bytes: */
if (EGifBufferedOutput(GifFile, Private->Buf,
Private->CrntShiftDWord & 0xff) == GIF_ERROR)
retval = GIF_ERROR;
Private->CrntShiftDWord >>= 8;
Private->CrntShiftState -= 8;
}
}
/* If code cannt fit into RunningBits bits, must raise its size. Note */
/* however that codes above 4095 are used for special signaling. */
if (Private->RunningCode >= Private->MaxCode1 && Code <= 4095) {
Private->MaxCode1 = 1 << ++Private->RunningBits;
}
return retval;
}
/******************************************************************************
* This routines buffers the given characters until 255 characters are ready
* to be output. If Code is equal to -1 the buffer is flushed (EOF).
* The buffer is Dumped with first byte as its size, as GIF format requires.
* Returns GIF_OK if written succesfully.
*****************************************************************************/
static int
EGifBufferedOutput(GifFileType * GifFile,
GifByteType * Buf,
int c) {
if (c == FLUSH_OUTPUT) {
/* Flush everything out. */
if (Buf[0] != 0
&& WRITE(GifFile, Buf, Buf[0] + 1) != (unsigned)(Buf[0] + 1)) {
_GifError = E_GIF_ERR_WRITE_FAILED;
return GIF_ERROR;
}
/* Mark end of compressed data, by an empty block (see GIF doc): */
Buf[0] = 0;
if (WRITE(GifFile, Buf, 1) != 1) {
_GifError = E_GIF_ERR_WRITE_FAILED;
return GIF_ERROR;
}
} else {
if (Buf[0] == 255) {
/* Dump out this buffer - it is full: */
if (WRITE(GifFile, Buf, Buf[0] + 1) != (unsigned)(Buf[0] + 1)) {
_GifError = E_GIF_ERR_WRITE_FAILED;
return GIF_ERROR;
}
Buf[0] = 0;
}
Buf[++Buf[0]] = c;
}
return GIF_OK;
}

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oversampling/WDL/giflib/gif_hash.c Normal file
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/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber IBM PC Ver 0.1, Jun. 1989 *
******************************************************************************
* Module to support the following operations: *
* *
* 1. InitHashTable - initialize hash table. *
* 2. ClearHashTable - clear the hash table to an empty state. *
* 2. InsertHashTable - insert one item into data structure. *
* 3. ExistsHashTable - test if item exists in data structure. *
* *
* This module is used to hash the GIF codes during encoding. *
******************************************************************************
* History: *
* 14 Jun 89 - Version 1.0 by Gershon Elber. *
*****************************************************************************/
#include "config.h"
/* Find a thirty-two bit int type */
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef __MSDOS__
#include <io.h>
#include <alloc.h>
#include <sys\stat.h>
#else
#include <sys/types.h>
#include <sys/stat.h>
#endif /* __MSDOS__ */
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif /* HAVE_FCNTL_H */
#include <stdio.h>
#include <string.h>
#include "gif_lib.h"
#include "gif_hash.h"
#include "gif_lib_private.h"
/* #define DEBUG_HIT_RATE Debug number of misses per hash Insert/Exists. */
#ifdef DEBUG_HIT_RATE
static long NumberOfTests = 0,
NumberOfMisses = 0;
#endif /* DEBUG_HIT_RATE */
static int KeyItem(UINT32 Item);
/******************************************************************************
* Initialize HashTable - allocate the memory needed and clear it. *
******************************************************************************/
GifHashTableType *_InitHashTable(void)
{
GifHashTableType *HashTable;
if ((HashTable = (GifHashTableType *) malloc(sizeof(GifHashTableType)))
== NULL)
return NULL;
_ClearHashTable(HashTable);
return HashTable;
}
/******************************************************************************
* Routine to clear the HashTable to an empty state. *
* This part is a little machine depended. Use the commented part otherwise. *
******************************************************************************/
void _ClearHashTable(GifHashTableType *HashTable)
{
memset(HashTable -> HTable, 0xFF, HT_SIZE * sizeof(UINT32));
}
/******************************************************************************
* Routine to insert a new Item into the HashTable. The data is assumed to be *
* new one. *
******************************************************************************/
void _InsertHashTable(GifHashTableType *HashTable, UINT32 Key, int Code)
{
int HKey = KeyItem(Key);
UINT32 *HTable = HashTable -> HTable;
#ifdef DEBUG_HIT_RATE
NumberOfTests++;
NumberOfMisses++;
#endif /* DEBUG_HIT_RATE */
while (HT_GET_KEY(HTable[HKey]) != 0xFFFFFL) {
#ifdef DEBUG_HIT_RATE
NumberOfMisses++;
#endif /* DEBUG_HIT_RATE */
HKey = (HKey + 1) & HT_KEY_MASK;
}
HTable[HKey] = HT_PUT_KEY(Key) | HT_PUT_CODE(Code);
}
/******************************************************************************
* Routine to test if given Key exists in HashTable and if so returns its code *
* Returns the Code if key was found, -1 if not. *
******************************************************************************/
int _ExistsHashTable(GifHashTableType *HashTable, UINT32 Key)
{
int HKey = KeyItem(Key);
UINT32 *HTable = HashTable -> HTable, HTKey;
#ifdef DEBUG_HIT_RATE
NumberOfTests++;
NumberOfMisses++;
#endif /* DEBUG_HIT_RATE */
while ((HTKey = HT_GET_KEY(HTable[HKey])) != 0xFFFFFL) {
#ifdef DEBUG_HIT_RATE
NumberOfMisses++;
#endif /* DEBUG_HIT_RATE */
if (Key == HTKey) return HT_GET_CODE(HTable[HKey]);
HKey = (HKey + 1) & HT_KEY_MASK;
}
return -1;
}
/******************************************************************************
* Routine to generate an HKey for the hashtable out of the given unique key. *
* The given Key is assumed to be 20 bits as follows: lower 8 bits are the *
* new postfix character, while the upper 12 bits are the prefix code. *
* Because the average hit ratio is only 2 (2 hash references per entry), *
* evaluating more complex keys (such as twin prime keys) does not worth it! *
******************************************************************************/
static int KeyItem(UINT32 Item)
{
return ((Item >> 12) ^ Item) & HT_KEY_MASK;
}
#ifdef DEBUG_HIT_RATE
/******************************************************************************
* Debugging routine to print the hit ratio - number of times the hash table *
* was tested per operation. This routine was used to test the KeyItem routine *
******************************************************************************/
void HashTablePrintHitRatio(void)
{
printf("Hash Table Hit Ratio is %ld/%ld = %ld%%.\n",
NumberOfMisses, NumberOfTests,
NumberOfMisses * 100 / NumberOfTests);
}
#endif /* DEBUG_HIT_RATE */

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oversampling/WDL/giflib/gif_hash.h Normal file
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/******************************************************************************
* Declarations, global to other of the GIF-HASH.C module. *
* *
* Written by Gershon Elber, Jun 1989 *
*******************************************************************************
* History: *
* 14 Jun 89 - Version 1.0 by Gershon Elber. *
******************************************************************************/
#ifndef _GIF_HASH_H_
#define _GIF_HASH_H_
#include "config.h"
/* Find a thirty-two bit int type */
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef HAVE_BASETSD_H
#include <basetsd.h>
#endif
#define HT_SIZE 8192 /* 12bits = 4096 or twice as big! */
#define HT_KEY_MASK 0x1FFF /* 13bits keys */
#define HT_KEY_NUM_BITS 13 /* 13bits keys */
#define HT_MAX_KEY 8191 /* 13bits - 1, maximal code possible */
#define HT_MAX_CODE 4095 /* Biggest code possible in 12 bits. */
/* The 32 bits of the long are divided into two parts for the key & code: */
/* 1. The code is 12 bits as our compression algorithm is limited to 12bits */
/* 2. The key is 12 bits Prefix code + 8 bit new char or 20 bits. */
/* The key is the upper 20 bits. The code is the lower 12. */
#define HT_GET_KEY(l) (l >> 12)
#define HT_GET_CODE(l) (l & 0x0FFF)
#define HT_PUT_KEY(l) (l << 12)
#define HT_PUT_CODE(l) (l & 0x0FFF)
typedef struct GifHashTableType {
UINT32 HTable[HT_SIZE];
} GifHashTableType;
GifHashTableType *_InitHashTable(void);
void _ClearHashTable(GifHashTableType *HashTable);
void _InsertHashTable(GifHashTableType *HashTable, UINT32 Key, int Code);
int _ExistsHashTable(GifHashTableType *HashTable, UINT32 Key);
#endif /* _GIF_HASH_H_ */

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oversampling/WDL/giflib/gif_lib.h Normal file
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/******************************************************************************
* In order to make life a little bit easier when using the GIF file format,
* this library was written, and which does all the dirty work...
*
* Written by Gershon Elber, Jun. 1989
* Hacks by Eric S. Raymond, Sep. 1992
******************************************************************************
* History:
* 14 Jun 89 - Version 1.0 by Gershon Elber.
* 3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names)
* 15 Sep 90 - Version 2.0 by Eric S. Raymond (Changes to suoport GIF slurp)
* 26 Jun 96 - Version 3.0 by Eric S. Raymond (Full GIF89 support)
* 17 Dec 98 - Version 4.0 by Toshio Kuratomi (Fix extension writing code)
*****************************************************************************/
#ifndef _GIF_LIB_H_
#define _GIF_LIB_H_ 1
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define GIF_LIB_VERSION " Version 4.1, "
#define GIF_ERROR 0
#define GIF_OK 1
#ifndef TRUE
#define TRUE 1
#endif /* TRUE */
#ifndef FALSE
#define FALSE 0
#endif /* FALSE */
#ifndef NULL
#define NULL 0
#endif /* NULL */
#define GIF_STAMP "GIFVER" /* First chars in file - GIF stamp. */
#define GIF_STAMP_LEN sizeof(GIF_STAMP) - 1
#define GIF_VERSION_POS 3 /* Version first character in stamp. */
#define GIF87_STAMP "GIF87a" /* First chars in file - GIF stamp. */
#define GIF89_STAMP "GIF89a" /* First chars in file - GIF stamp. */
#define GIF_FILE_BUFFER_SIZE 16384 /* Files uses bigger buffers than usual. */
typedef int GifBooleanType;
typedef unsigned char GifPixelType;
typedef unsigned char *GifRowType;
typedef unsigned char GifByteType;
#ifdef _GBA_OPTMEM
typedef unsigned short GifPrefixType;
typedef short GifWord;
#else
typedef unsigned int GifPrefixType;
typedef int GifWord;
#endif
#define GIF_MESSAGE(Msg)
#define GIF_EXIT(Msg)
#ifdef SYSV
#define VoidPtr char *
#else
#define VoidPtr void *
#endif /* SYSV */
typedef struct GifColorType {
GifByteType Red, Green, Blue;
} GifColorType;
typedef struct ColorMapObject {
int ColorCount;
int BitsPerPixel;
GifColorType *Colors; /* on malloc(3) heap */
} ColorMapObject;
typedef struct GifImageDesc {
GifWord Left, Top, Width, Height, /* Current image dimensions. */
Interlace; /* Sequential/Interlaced lines. */
ColorMapObject *ColorMap; /* The local color map */
} GifImageDesc;
typedef struct GifFileType {
GifWord SWidth, SHeight, /* Screen dimensions. */
SColorResolution, /* How many colors can we generate? */
SBackGroundColor; /* I hope you understand this one... */
ColorMapObject *SColorMap; /* NULL if not exists. */
int ImageCount; /* Number of current image */
GifImageDesc Image; /* Block describing current image */
VoidPtr UserData; /* hook to attach user data (TVT) */
VoidPtr Private; /* Don't mess with this! */
} GifFileType;
typedef enum {
UNDEFINED_RECORD_TYPE,
SCREEN_DESC_RECORD_TYPE,
IMAGE_DESC_RECORD_TYPE, /* Begin with ',' */
EXTENSION_RECORD_TYPE, /* Begin with '!' */
TERMINATE_RECORD_TYPE /* Begin with ';' */
} GifRecordType;
/* DumpScreen2Gif routine constants identify type of window/screen to dump.
* Note all values below 1000 are reserved for the IBMPC different display
* devices (it has many!) and are compatible with the numbering TC2.0
* (Turbo C 2.0 compiler for IBM PC) gives to these devices.
*/
typedef enum {
GIF_DUMP_SGI_WINDOW = 1000,
GIF_DUMP_X_WINDOW = 1001
} GifScreenDumpType;
/* func type to read gif data from arbitrary sources (TVT) */
typedef int (*InputFunc) (GifFileType *, GifByteType *, int);
/* func type to write gif data ro arbitrary targets.
* Returns count of bytes written. (MRB)
*/
typedef int (*OutputFunc) (GifFileType *, const GifByteType *, int);
/******************************************************************************
* GIF89 extension function codes
******************************************************************************/
#define COMMENT_EXT_FUNC_CODE 0xfe /* comment */
#define GRAPHICS_EXT_FUNC_CODE 0xf9 /* graphics control */
#define PLAINTEXT_EXT_FUNC_CODE 0x01 /* plaintext */
#define APPLICATION_EXT_FUNC_CODE 0xff /* application block */
/******************************************************************************
* O.K., here are the routines one can access in order to encode GIF file:
* (GIF_LIB file EGIF_LIB.C).
******************************************************************************/
GifFileType *EGifOpenFileName(const char *GifFileName,
int GifTestExistance);
GifFileType *EGifOpenFileHandle(int GifFileHandle);
GifFileType *EGifOpen(void *userPtr, OutputFunc writeFunc);
int EGifSpew(GifFileType * GifFile);
void EGifSetGifVersion(const char *Version);
int EGifPutScreenDesc(GifFileType * GifFile,
int GifWidth, int GifHeight, int GifColorRes,
int GifBackGround,
const ColorMapObject * GifColorMap);
int EGifPutImageDesc(GifFileType * GifFile, int GifLeft, int GifTop,
int Width, int GifHeight, int GifInterlace,
const ColorMapObject * GifColorMap);
int EGifPutLine(GifFileType * GifFile, GifPixelType * GifLine,
int GifLineLen);
int EGifPutPixel(GifFileType * GifFile, GifPixelType GifPixel);
int EGifPutComment(GifFileType * GifFile, const char *GifComment);
int EGifPutExtensionFirst(GifFileType * GifFile, int GifExtCode,
int GifExtLen, const VoidPtr GifExtension);
int EGifPutExtensionNext(GifFileType * GifFile, int GifExtCode,
int GifExtLen, const VoidPtr GifExtension);
int EGifPutExtensionLast(GifFileType * GifFile, int GifExtCode,
int GifExtLen, const VoidPtr GifExtension);
int EGifPutExtension(GifFileType * GifFile, int GifExtCode, int GifExtLen,
const VoidPtr GifExtension);
int EGifPutCode(GifFileType * GifFile, int GifCodeSize,
const GifByteType * GifCodeBlock);
int EGifPutCodeNext(GifFileType * GifFile,
const GifByteType * GifCodeBlock);
int EGifCloseFile(GifFileType * GifFile);
#define E_GIF_ERR_OPEN_FAILED 1 /* And EGif possible errors. */
#define E_GIF_ERR_WRITE_FAILED 2
#define E_GIF_ERR_HAS_SCRN_DSCR 3
#define E_GIF_ERR_HAS_IMAG_DSCR 4
#define E_GIF_ERR_NO_COLOR_MAP 5
#define E_GIF_ERR_DATA_TOO_BIG 6
#define E_GIF_ERR_NOT_ENOUGH_MEM 7
#define E_GIF_ERR_DISK_IS_FULL 8
#define E_GIF_ERR_CLOSE_FAILED 9
#define E_GIF_ERR_NOT_WRITEABLE 10
/******************************************************************************
* O.K., here are the routines one can access in order to decode GIF file:
* (GIF_LIB file DGIF_LIB.C).
*****************************************************************************/
#ifndef _GBA_NO_FILEIO
GifFileType *DGifOpenFileName(const char *GifFileName);
GifFileType *DGifOpenFileHandle(int GifFileHandle);
int DGifSlurp(GifFileType * GifFile);
#endif /* _GBA_NO_FILEIO */
GifFileType *DGifOpen(void *userPtr, InputFunc readFunc); /* new one
* (TVT) */
int DGifGetScreenDesc(GifFileType * GifFile);
int DGifGetRecordType(GifFileType * GifFile, GifRecordType * GifType);
int DGifGetImageDesc(GifFileType * GifFile);
int DGifGetLine(GifFileType * GifFile, GifPixelType * GifLine, int GifLineLen);
int DGifGetPixel(GifFileType * GifFile, GifPixelType GifPixel);
int DGifGetComment(GifFileType * GifFile, char *GifComment);
int DGifGetExtension(GifFileType * GifFile, int *GifExtCode,
GifByteType ** GifExtension);
int DGifGetExtensionNext(GifFileType * GifFile, GifByteType ** GifExtension);
int DGifGetCode(GifFileType * GifFile, int *GifCodeSize,
GifByteType ** GifCodeBlock);
int DGifGetCodeNext(GifFileType * GifFile, GifByteType ** GifCodeBlock);
int DGifGetLZCodes(GifFileType * GifFile, int *GifCode);
int DGifCloseFile(GifFileType * GifFile);
#define D_GIF_ERR_OPEN_FAILED 101 /* And DGif possible errors. */
#define D_GIF_ERR_READ_FAILED 102
#define D_GIF_ERR_NOT_GIF_FILE 103
#define D_GIF_ERR_NO_SCRN_DSCR 104
#define D_GIF_ERR_NO_IMAG_DSCR 105
#define D_GIF_ERR_NO_COLOR_MAP 106
#define D_GIF_ERR_WRONG_RECORD 107
#define D_GIF_ERR_DATA_TOO_BIG 108
#define D_GIF_ERR_NOT_ENOUGH_MEM 109
#define D_GIF_ERR_CLOSE_FAILED 110
#define D_GIF_ERR_NOT_READABLE 111
#define D_GIF_ERR_IMAGE_DEFECT 112
#define D_GIF_ERR_EOF_TOO_SOON 113
/******************************************************************************
* O.K., here are the routines from GIF_LIB file QUANTIZE.C.
******************************************************************************/
int QuantizeBuffer(unsigned int Width, unsigned int Height,
int *ColorMapSize, GifByteType * RedInput,
GifByteType * GreenInput, GifByteType * BlueInput,
GifByteType * OutputBuffer,
GifColorType * OutputColorMap);
/******************************************************************************
* O.K., here are the routines from GIF_LIB file QPRINTF.C.
******************************************************************************/
extern int GifQuietPrint;
#ifdef HAVE_STDARG_H
extern void GifQprintf(char *Format, ...);
#elif defined (HAVE_VARARGS_H)
extern void GifQprintf();
#endif /* HAVE_STDARG_H */
/******************************************************************************
* O.K., here are the routines from GIF_LIB file GIF_ERR.C.
******************************************************************************/
#ifndef _GBA_NO_FILEIO
extern void PrintGifError(void);
#endif /* _GBA_NO_FILEIO */
extern int GifLastError(void);
/******************************************************************************
* O.K., here are the routines from GIF_LIB file DEV2GIF.C.
******************************************************************************/
extern int DumpScreen2Gif(const char *FileName,
int ReqGraphDriver,
long ReqGraphMode1,
long ReqGraphMode2,
long ReqGraphMode3);
/*****************************************************************************
*
* Everything below this point is new after version 1.2, supporting `slurp
* mode' for doing I/O in two big belts with all the image-bashing in core.
*
*****************************************************************************/
/******************************************************************************
* Color Map handling from ALLOCGIF.C
*****************************************************************************/
extern ColorMapObject *MakeMapObject(int ColorCount,
const GifColorType * ColorMap);
extern void FreeMapObject(ColorMapObject * Object);
extern ColorMapObject *UnionColorMap(const ColorMapObject * ColorIn1,
const ColorMapObject * ColorIn2,
GifPixelType ColorTransIn2[]);
extern int BitSize(int n);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _GIF_LIB_H */

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#ifndef _GIF_LIB_PRIVATE_H
#define _GIF_LIB_PRIVATE_H
#include "gif_lib.h"
#include "gif_hash.h"
#define PROGRAM_NAME "GIFLIB"
#ifdef SYSV
#define VersionStr "Gif library module,\t\tEric S. Raymond\n\
(C) Copyright 1997 Eric S. Raymond\n"
#else
#define VersionStr PROGRAM_NAME " IBMPC " GIF_LIB_VERSION \
" Eric S. Raymond, " __DATE__ ", " \
__TIME__ "\n" "(C) Copyright 1997 Eric S. Raymond\n"
#endif /* SYSV */
#define LZ_MAX_CODE 4095 /* Biggest code possible in 12 bits. */
#define LZ_BITS 12
#define FLUSH_OUTPUT 4096 /* Impossible code, to signal flush. */
#define FIRST_CODE 4097 /* Impossible code, to signal first. */
#define NO_SUCH_CODE 4098 /* Impossible code, to signal empty. */
#define FILE_STATE_WRITE 0x01
#define FILE_STATE_SCREEN 0x02
#define FILE_STATE_IMAGE 0x04
#define FILE_STATE_READ 0x08
#define IS_READABLE(Private) (Private->FileState & FILE_STATE_READ)
#define IS_WRITEABLE(Private) (Private->FileState & FILE_STATE_WRITE)
typedef struct GifFilePrivateType {
GifWord FileState, FileHandle, /* Where all this data goes to! */
BitsPerPixel, /* Bits per pixel (Codes uses at least this + 1). */
ClearCode, /* The CLEAR LZ code. */
EOFCode, /* The EOF LZ code. */
RunningCode, /* The next code algorithm can generate. */
RunningBits, /* The number of bits required to represent RunningCode. */
MaxCode1, /* 1 bigger than max. possible code, in RunningBits bits. */
LastCode, /* The code before the current code. */
CrntCode, /* Current algorithm code. */
StackPtr, /* For character stack (see below). */
CrntShiftState; /* Number of bits in CrntShiftDWord. */
unsigned long CrntShiftDWord; /* For bytes decomposition into codes. */
unsigned long PixelCount; /* Number of pixels in image. */
FILE *File; /* File as stream. */
InputFunc Read; /* function to read gif input (TVT) */
OutputFunc Write; /* function to write gif output (MRB) */
GifByteType Buf[256]; /* Compressed input is buffered here. */
GifByteType Stack[LZ_MAX_CODE]; /* Decoded pixels are stacked here. */
GifByteType Suffix[LZ_MAX_CODE + 1]; /* So we can trace the codes. */
GifPrefixType Prefix[LZ_MAX_CODE + 1];
GifHashTableType *HashTable;
} GifFilePrivateType;
extern int _GifError;
#endif /* _GIF_LIB_PRIVATE_H */

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/*****************************************************************************
* "Gif-Lib" - Yet another gif library.
*
* Written by: Gershon Elber Ver 0.1, Jun. 1989
* Extensively hacked by: Eric S. Raymond Ver 1.?, Sep 1992
*****************************************************************************
* GIF construction tools
*****************************************************************************
* History:
* 15 Sep 92 - Version 1.0 by Eric Raymond.
****************************************************************************/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "gif_lib.h"
#define MAX(x, y) (((x) > (y)) ? (x) : (y))
/******************************************************************************
* Miscellaneous utility functions
*****************************************************************************/
/* return smallest bitfield size n will fit in */
int
BitSize(int n) {
register int i;
for (i = 1; i <= 8; i++)
if ((1 << i) >= n)
break;
return (i);
}
/******************************************************************************
* Color map object functions
*****************************************************************************/
/*
* Allocate a color map of given size; initialize with contents of
* ColorMap if that pointer is non-NULL.
*/
ColorMapObject *
MakeMapObject(int ColorCount,
const GifColorType * ColorMap) {
ColorMapObject *Object;
/*** FIXME: Our ColorCount has to be a power of two. Is it necessary to
* make the user know that or should we automatically round up instead? */
if (ColorCount != (1 << BitSize(ColorCount))) {
return ((ColorMapObject *) NULL);
}
Object = (ColorMapObject *)malloc(sizeof(ColorMapObject));
if (Object == (ColorMapObject *) NULL) {
return ((ColorMapObject *) NULL);
}
Object->Colors = (GifColorType *)calloc(ColorCount, sizeof(GifColorType));
if (Object->Colors == (GifColorType *) NULL) {
return ((ColorMapObject *) NULL);
}
Object->ColorCount = ColorCount;
Object->BitsPerPixel = BitSize(ColorCount);
if (ColorMap) {
memcpy((char *)Object->Colors,
(char *)ColorMap, ColorCount * sizeof(GifColorType));
}
return (Object);
}
/*
* Free a color map object
*/
void
FreeMapObject(ColorMapObject * Object) {
if (Object != NULL) {
free(Object->Colors);
free(Object);
/*** FIXME:
* When we are willing to break API we need to make this function
* FreeMapObject(ColorMapObject **Object)
* and do this assignment to NULL here:
* *Object = NULL;
*/
}
}
#ifdef DEBUG
void
DumpColorMap(ColorMapObject * Object,
FILE * fp) {
if (Object) {
int i, j, Len = Object->ColorCount;
for (i = 0; i < Len; i += 4) {
for (j = 0; j < 4 && j < Len; j++) {
fprintf(fp, "%3d: %02x %02x %02x ", i + j,
Object->Colors[i + j].Red,
Object->Colors[i + j].Green,
Object->Colors[i + j].Blue);
}
fprintf(fp, "\n");
}
}
}
#endif /* DEBUG */
/*
* Compute the union of two given color maps and return it. If result can't
* fit into 256 colors, NULL is returned, the allocated union otherwise.
* ColorIn1 is copied as is to ColorUnion, while colors from ColorIn2 are
* copied iff they didn't exist before. ColorTransIn2 maps the old
* ColorIn2 into ColorUnion color map table.
*/
ColorMapObject *
UnionColorMap(const ColorMapObject * ColorIn1,
const ColorMapObject * ColorIn2,
GifPixelType ColorTransIn2[]) {
int i, j, CrntSlot, RoundUpTo, NewBitSize;
ColorMapObject *ColorUnion;
/*
* Allocate table which will hold the result for sure.
*/
ColorUnion = MakeMapObject(MAX(ColorIn1->ColorCount,
ColorIn2->ColorCount) * 2, NULL);
if (ColorUnion == NULL)
return (NULL);
/* Copy ColorIn1 to ColorUnionSize; */
/*** FIXME: What if there are duplicate entries into the colormap to begin
* with? */
for (i = 0; i < ColorIn1->ColorCount; i++)
ColorUnion->Colors[i] = ColorIn1->Colors[i];
CrntSlot = ColorIn1->ColorCount;
/*
* Potentially obnoxious hack:
*
* Back CrntSlot down past all contiguous {0, 0, 0} slots at the end
* of table 1. This is very useful if your display is limited to
* 16 colors.
*/
while (ColorIn1->Colors[CrntSlot - 1].Red == 0
&& ColorIn1->Colors[CrntSlot - 1].Green == 0
&& ColorIn1->Colors[CrntSlot - 1].Blue == 0)
CrntSlot--;
/* Copy ColorIn2 to ColorUnionSize (use old colors if they exist): */
for (i = 0; i < ColorIn2->ColorCount && CrntSlot <= 256; i++) {
/* Let's see if this color already exists: */
/*** FIXME: Will it ever occur that ColorIn2 will contain duplicate
* entries? So we should search from 0 to CrntSlot rather than
* ColorIn1->ColorCount?
*/
for (j = 0; j < ColorIn1->ColorCount; j++)
if (memcmp (&ColorIn1->Colors[j], &ColorIn2->Colors[i],
sizeof(GifColorType)) == 0)
break;
if (j < ColorIn1->ColorCount)
ColorTransIn2[i] = j; /* color exists in Color1 */
else {
/* Color is new - copy it to a new slot: */
ColorUnion->Colors[CrntSlot] = ColorIn2->Colors[i];
ColorTransIn2[i] = CrntSlot++;
}
}
if (CrntSlot > 256) {
FreeMapObject(ColorUnion);
return ((ColorMapObject *) NULL);
}
NewBitSize = BitSize(CrntSlot);
RoundUpTo = (1 << NewBitSize);
if (RoundUpTo != ColorUnion->ColorCount) {
register GifColorType *Map = ColorUnion->Colors;
/*
* Zero out slots up to next power of 2.
* We know these slots exist because of the way ColorUnion's
* start dimension was computed.
*/
for (j = CrntSlot; j < RoundUpTo; j++)
Map[j].Red = Map[j].Green = Map[j].Blue = 0;
/* perhaps we can shrink the map? */
if (RoundUpTo < ColorUnion->ColorCount)
ColorUnion->Colors = (GifColorType *)realloc(Map,
sizeof(GifColorType) * RoundUpTo);
}
ColorUnion->ColorCount = RoundUpTo;
ColorUnion->BitsPerPixel = NewBitSize;
return (ColorUnion);
}