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fix tga header read

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When you ping() an image with imagemagick to get the header, some format
loaders (eg. TGA) don't set all the fields. In this case,
image->colormap was not set and that made GetImageChannelDepth() crash.

Work around this, at least in this case, by allocating a colourmap
ourselves if none is set.

see https://github.com/jcupitt/libvips/issues/980
This commit is contained in:
John Cupitt 2018-05-25 16:02:25 +01:00
parent c349b31c5f
commit 1a95b2df89
4 changed files with 39 additions and 0 deletions
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11
configure.ac
View File

@ -704,6 +704,17 @@ if test x"$magick6" = x"yes"; then
LIBS="$save_LIBS"
fi
if test x"$magick6" = x"yes"; then
# more recent magick6s have AcquireImageColormap rather than
# AllocateImageColormap groan
save_LIBS="$LIBS"
LIBS="$LIBS $MAGICK_LIBS"
AC_CHECK_FUNCS(AcquireImageColormap,
AC_DEFINE(HAVE_ACQUIREIMAGECOLORMAP,1,
[define if your magick has AcquireImageColormap.]))
LIBS="$save_LIBS"
fi
if test x"$magick6" = x"yes"; then
# more recent magick6s have SetImageExtent
save_LIBS="$LIBS"

16
libvips/foreign/magick.c
View File

@ -52,6 +52,12 @@ magick_acquire_image( const ImageInfo *image_info, ExceptionInfo *exception )
return( AcquireImage( image_info, exception ) );
}
void
magick_acquire_image_colormap( Image *image, int colors )
{
AcquireImageColormap( image, colors )
}
void
magick_acquire_next_image( const ImageInfo *image_info, Image *image,
ExceptionInfo *exception )
@ -107,6 +113,16 @@ magick_acquire_image( const ImageInfo *image_info, ExceptionInfo *exception )
#endif
}
void
magick_acquire_image_colormap( Image *image, int colors )
{
#ifdef HAVE_ACQUIREIMAGECOLORMAP
AcquireImageColormap( image, colors );
#else /*!HAVE_ACQUIREIMAGECOLORMAP*/
AllocateImageColormap( image, colors );
#endif /*HAVE_ACQUIREIMAGECOLORMAP*/
}
void
magick_acquire_next_image( const ImageInfo *image_info, Image *image,
ExceptionInfo *exception )

1
libvips/foreign/magick.h
View File

@ -44,6 +44,7 @@
Image *magick_acquire_image( const ImageInfo *image_info,
ExceptionInfo *exception );
void magick_acquire_image_colormap( Image *image, int colors );
void magick_acquire_next_image( const ImageInfo *image_info,
Image *image, ExceptionInfo *exception );
int magick_set_image_size( Image *image,

11
libvips/foreign/magick2vips.c
View File

@ -57,6 +57,8 @@
* - try using GetImageChannelDepth() instead of ->depth
* 24/4/18
* - add format hint
* 25/5/18
* - acquire an image colormap if none set
*/
/*
@ -327,6 +329,15 @@ parse_header( Read *read )
if( (im->Bands = get_bands( image )) < 0 )
return( -1 );
/* Some ImageMagick loaders (eg. TGA) fail to set the ->colormap
* field on Ping. GetImageChannelDepth() needs this and
* will crash if it's not set.
*
* If there's no colormap, set an empty one.
*/
if( !image->colormap )
magick_acquire_image_colormap( image, image->colors );
/* Depth can be 'fractional'.
*
* You'd think we should use