remove the embedded thumbnail reader
remove the embedded thumbnail reader, embedded thumbnails are too unlike the main image wrt. rotation / colour / etc.
This commit is contained in:
John Cupitt
parent
40a15b3aa0
commit
66d0e28dc2
@ -10,6 +10,8 @@
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- VipsStatistic operations are sequential
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- vipsthumbnail attaches main image metadata to embedded thumbnails
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- vipsthumbnail has --rotate auto-rotate option
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- removed embedded thumbnail reader from vipsthumbnail: embedded thumbnails
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are too unlike the main image
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6/3/14 started 7.38.6
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- grey ramp minimum was wrong
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6
TODO
6
TODO
@ -1,11 +1,5 @@
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- vipsthumbnail needs to know about more exif orientation tags
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- vipsthumbnail --rotate breaks for embedded thumbnail sources
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embedded thumbnails seems to have had the orientation applied already
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need to not copy orientation tag from main to thumb? is this right for all
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images?
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- think of a better way to support skipahead
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@ -46,6 +46,9 @@
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* - copy main image metadata to embedded thumbnails, thanks ottob
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* 6/3/14
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* - add --rotate flag
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* 7/3/14
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* - remove the embedded thumbnail reader, embedded thumbnails are too
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* unlike the main image wrt. rotation / colour / etc.
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*/
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#ifdef HAVE_CONFIG_H
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@ -219,88 +222,7 @@ thumbnail_find_jpegshrink( VipsImage *im )
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return( 1 );
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}
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#define THUMBNAIL "jpeg-thumbnail-data"
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static void *
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copy_jpeg_field( VipsImage *from, const char *field, GValue *value, void *a )
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{
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VipsImage *to = (VipsImage *) a;
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if( vips_isprefix( "exif-", field ) ||
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strcmp( field, VIPS_META_EXIF_NAME ) == 0 ||
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strcmp( field, VIPS_META_XMP_NAME ) == 0 ||
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strcmp( field, VIPS_META_IPCT_NAME ) == 0 ||
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strcmp( field, VIPS_META_ICC_NAME ) == 0 )
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vips_image_set( to, field, value );
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return( NULL );
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}
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/* Try to read an embedded thumbnail.
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*/
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static VipsImage *
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thumbnail_get_thumbnail( VipsImage *im, int jpegshrink )
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{
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void *ptr;
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size_t size;
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VipsImage *thumb;
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if( !vips_image_get_typeof( im, THUMBNAIL ) ||
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vips_image_get_blob( im, THUMBNAIL, &ptr, &size ) ||
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vips_jpegload_buffer( ptr, size, &thumb,
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"shrink", jpegshrink,
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NULL ) ) {
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vips_info( "vipsthumbnail", "no jpeg thumbnail" );
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return( NULL );
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}
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/* Copy over the metadata from the main image. We want our thumbnail
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* to have the orientation, profile etc. from there.
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*/
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(void) vips_image_map( im, copy_jpeg_field, thumb );
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return( thumb );
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}
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/* Get an embedded thumb with the appropriate shrink.
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*/
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static VipsImage *
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thumbnail_get_thumbnail_shrink( VipsImage *im )
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{
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VipsImage *thumb;
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double residual;
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int jpegshrink;
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if( !(thumb = thumbnail_get_thumbnail( im, 1 )) )
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return( NULL );
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calculate_shrink( thumb, &residual );
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if( residual > 1.0 ) {
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vips_info( "vipsthumbnail", "jpeg thumbnail too small" );
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g_object_unref( thumb );
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return( NULL );
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}
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/* Reload with the correct downshrink.
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*/
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jpegshrink = thumbnail_find_jpegshrink( thumb );
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vips_info( "vipsthumbnail",
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"loading jpeg thumbnail with factor %d pre-shrink",
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jpegshrink );
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g_object_unref( thumb );
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if( !(thumb = thumbnail_get_thumbnail( im, jpegshrink )) )
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return( NULL );
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vips_info( "vipsthumbnail", "using %dx%d jpeg thumbnail",
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thumb->Xsize, thumb->Ysize );
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return( thumb );
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}
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/* Open an image, returning the best version of that image for thumbnailing.
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*
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* jpegs can have embedded thumbnails ... use that if it's large enough.
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*
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* libjpeg supports fast shrink-on-read, so if we have a JPEG, we can ask
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* VIPS to load a lower resolution version.
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@ -322,31 +244,13 @@ thumbnail_open( VipsObject *process, const char *filename )
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vips_info( "vipsthumbnail", "selected loader is %s", loader );
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if( strcmp( loader, "VipsForeignLoadJpegFile" ) == 0 ) {
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VipsImage *thumb;
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int jpegshrink;
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/* This will just read in the header and is quick.
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*/
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if( !(im = vips_image_new_from_file( filename )) )
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return( NULL );
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/* Try to read an embedded thumbnail. If we find one, use that
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* instead.
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*/
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if( (thumb = thumbnail_get_thumbnail_shrink( im )) ) {
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/* @thumb has not been fully decoded yet ...
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* we must not close @im
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* until we're done with @thumb.
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*/
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vips_object_local( VIPS_OBJECT( thumb ), im );
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im = thumb;
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}
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else {
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int jpegshrink;
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vips_info( "vipsthumbnail",
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"processing main jpeg image" );
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jpegshrink = thumbnail_find_jpegshrink( im );
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g_object_unref( im );
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@ -361,7 +265,6 @@ thumbnail_open( VipsObject *process, const char *filename )
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NULL ) )
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return( NULL );
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}
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}
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else {
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/* All other formats.
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*/
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