<AWT Dev> [OpenJDK 2D-Dev] RFR: 8081315: 8077982 giflib upgrade breaks system giflib builds with earlier versions

[Andrew Hughes]

----- Original Message -----
> Sure, looks good to me.
> 
> Thanks,
> 
> Alexander.
> 
> On 06/05/2015 06:34 PM, Andrew Hughes wrote:
> > ----- Original Message -----
> >> Hi Andrew,
> >>
> >> We have removed a workaround[0] for interlaced images support, there is
> >> no need in it after 5.0.0 [1]:
> >>> DGifSlurp() and EGifSpew() now read and write interlaced images properly.
> >> I didn't test it, but it seems to me that interlaced images will look
> >> bad after building against GIFLIB < 5.
> >> So I suggest to revert SplashDecodeGif() to its state before GIFLIB
> >> upgrade and make "interlaced if" conditional[3]:
> >>
> >> diff -r 58535e641739
> >> src/java.desktop/share/native/libsplashscreen/splashscreen_gif.c
> >> --- a/src/java.desktop/share/native/libsplashscreen/splashscreen_gif.c
> >> +++ b/src/java.desktop/share/native/libsplashscreen/splashscreen_gif.c
> >> @@ -213,16 +213,14 @@ SplashDecodeGif(Splash * splash, GifFile
> >>                byte_t *pSrc = image->RasterBits;
> >>                ImageFormat srcFormat;
> >>                ImageRect srcRect, dstRect;
> >> -            int pass, npass;
> >> +            int pass = 4, npass = 5;
> >>
> >> +#if GIFLIB_MAJOR < 5
> >>                if (desc->Interlace) {
> >>                    pass = 0;
> >>                    npass = 4;
> >>                }
> >> -            else {
> >> -                pass = 4;
> >> -                npass = 5;
> >> -            }
> >> +#endif
> >>
> >>                srcFormat.colorMap = colorMapBuf;
> >>                srcFormat.depthBytes = 1;
> >>
> >> And again, I haven't tested it against GIFLIB 4.*.
> >>
> >> [0]
> >> http://cr.openjdk.java.net/~azvegint/jdk/9/8077982/00/src/java.desktop/share/native/libsplashscreen/splashscreen_gif.c.sdiff.html
> >> [1] http://sourceforge.net/p/giflib/code/ci/master/tree/NEWS
> >> [3] http://cr.openjdk.java.net/~azvegint/jdk/9/8081315/03/
> >>
> >> Thanks,
> >>
> >> Alexander.
> >>
> > Thanks for the heads up on this. It's not very obvious from the code.
> >
> > I went back through the original 8077982 changes to that file and
> > produced the resulting webrev:
> >
> > http://cr.openjdk.java.net/~andrew/8081315/webrev.03/
> >
> > Comparing with the original (giflib < 5) splashscreen_gif.c now gives:
> >
> > @@ -213,16 +213,16 @@
> >               byte_t *pSrc = image->RasterBits;
> >               ImageFormat srcFormat;
> >               ImageRect srcRect, dstRect;
> > -            int pass, npass;
> > +            int pass = 4, npass = 5;
> >   
> > +#if GIFLIB_MAJOR < 5
> > +	    /* Interlaced gif support is broken in giflib < 5
> > +	       so we need to work around this */
> >               if (desc->Interlace) {
> >                   pass = 0;
> >                   npass = 4;
> >               }
> > -            else {
> > -                pass = 4;
> > -                npass = 5;
> > -            }
> > +#endif
> >   
> >               srcFormat.colorMap = colorMapBuf;
> >               srcFormat.depthBytes = 1;
> >
> > much as you have above.
> >
> > Ok to push this version?
> >
> > Thanks,
> 
> 

Thanks. Pushed:

http://hg.openjdk.java.net/jdk9/client/jdk/rev/f10c6da6698b
-- 
Andrew :)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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