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> Windows > Small GIF decoder for FASM and Fresh. |
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roticv 25 Feb 2004, 11:54
What about gif's patent issues?
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25 Feb 2004, 11:54 |
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JohnFound 25 Feb 2004, 12:07
roticv wrote: What about gif's patent issues? Well, I expected that question. 
I made some search about this problem and IMHO everythink is clear. There are several considerations: 1. Patent in USA expired. 2. Unisys patent in EU is probably illegal, because it was (and today also) illegal to patent interfaces, formats and programs in EU: http://www.noepatents.org/gif.html?LANG=en At least (AFAIK) no one was sued in Europe for using LZW. 3. In all cases, patent in Europe will expire on 18.06.2004 (btw: my birthday 
4. AFAIK, decoders are not covered by LZW patent. (or Unisis granted the right for writing GIF decoders for free). Regards |
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25 Feb 2004, 12:07 |
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JohnFound 26 Feb 2004, 07:33
Hi all.
With the permission of MadWizard (aka Exagone), the author of the original source, I changed the license of library FASM port to "Fresh artistic license". Also small bugfix and added two precompiled demos - one for file loading and one for resource loading. File in the first post of the thread is updated. Regards. |
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26 Feb 2004, 07:33 |
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JohnFound 27 Feb 2004, 22:24
Hi again.
I made some (big) changes in FreshGif library and here is version 1.1. history.txt wrote:
Regards.
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27 Feb 2004, 22:24 |
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pelaillo 28 Feb 2004, 13:51
Very nice JohnFound !!
btw, I've translated another useful stuff for the lib from Thomas (aka MadWizard) I have played also with alpha blending from BitRAKE but I need to do some cleaning. Code: proc Resample,lpSrc,lpDest,dwWidth,dwHeight ; Procedure written by Thomas ; http://www.madwizard.org ; This snippet rescales bitmap data (32-bits per pixel) into ; a bitmap of half the size. ; lpSrc is a pointer to the source bitmap data ; lpDest is a pointer for the output data ; dwWidth is the width of the source bitmap ; dwHeight is the height of the source bitmap. ; It resamples the bitmap which means it calculates one output ; pixel by averaging four input pixels. The algorithm uses MMX, ; the width should be a multiple of 4, height should be a ; multiple of 2. begin push edi esi ebx mov esi, [lpSrc] mov edi, [lpDest] mov edx, [dwWidth] shr edx, 1 mov ecx, [dwWidth] pxor MM4, MM4 mov ebx, [dwHeight] shr ebx, 1 ALIGN 16 .nextline: mov edx, ecx shr edx, 2 ALIGN 16 .nextpixel: movq MM0, [esi] ; MM0: X2 R2 G2 B2-X1 R1 G1 B1 movq MM1, [esi+8] ; MM1: X4 R4 G4 B4-X3 R3 G3 B3 movq MM2, [esi+4*ecx] ; MM2: X6 R6 G6 B6-X5 R5 G5 B5 movq MM3, [esi+4*ecx+8] ; MM3: X8 R8 G8 B8-X7 R7 G7 B7 movq MM5, MM0 movq MM6, MM2 punpckhbw MM0, MM4 ; MM0: 00 X2 00 R2-00 G2 00 B2 punpckhbw MM2, MM4 ; MM2: 00 X6 00 R6-00 B6 00 B6 punpcklbw MM5, MM4 ; MM5: 00 X1 00 R1-00 G1 00 B1 punpcklbw MM6, MM4 ; MM6: 00 X5 00 R5-00 G5 00 B5 paddw MM0, MM2 paddw MM0, MM5 paddw MM0, MM6 psrlw MM0, 2 ; second pixel: movq MM5, MM1 movq MM6, MM3 punpckhbw MM1, MM4 ; MM1: 00 X4 00 R4-00 G4 00 B4 punpckhbw MM3, MM4 ; MM3: 00 X8 00 R8-00 B8 00 B8 punpcklbw MM5, MM4 ; MM5: 00 X3 00 R3-00 G3 00 B3 punpcklbw MM6, MM4 ; MM6: 00 X7 00 R7-00 G7 00 B7 paddw MM1, MM3 paddw MM1, MM5 paddw MM1, MM6 psrlw MM1, 2 ; now: MM0: 00 XQ 00 RQ-00 GQ 00 BQ ;where Q is the first mixed pixel ; now: MM1: 00 XP 00 RP-00 GP 00 BP ;where P is the second mixed pixel ; output should be: BQ GQ RQ XQ-BP GP RP XP (in mem) ; XP RP GP BP XQ RQ GQ BQ (in reg) packuswb MM0, MM1 movq [edi], MM0 add esi, 16 add edi, 8 dec edx jnz .nextpixel lea esi, [esi+4*ecx] dec ebx jnz .nextline emms pop ebx esi edi return endp |
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28 Feb 2004, 13:51 |
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Feggger 29 Sep 2006, 12:40
"GIF is NOW finally free - for real" (from 1 october 2006)
http://www.freesoftwaremagazine.com/node/1772 |
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29 Sep 2006, 12:40 |
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bogdanontanu 29 Sep 2006, 16:13
right
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29 Sep 2006, 16:13 |
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Vasilev Vjacheslav 29 Sep 2006, 17:41
the patent is out-of-date?
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29 Sep 2006, 17:41 |
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