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more exif read improvements 

some jpegs use a signed long to store the resolution unit (??), remove
the checks on tag format for res unit
This commit is contained in:
John Cupitt 2012-11-16 19:53:59 +00:00
parent 74f545fc6f
commit 7025fe4081
2 changed files with 7 additions and 10 deletions
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5
libvips/foreign/jpeg2vips.c
View File

@ -484,12 +484,11 @@ get_entry_double( ExifData *ed, int ifd, ExifTag tag, double *out )
}
static int
get_entry_short( ExifData *ed, int ifd, ExifTag tag, int *out )
get_entry_int( ExifData *ed, int ifd, ExifTag tag, int *out )
{
ExifEntry *entry;
if( !(entry = exif_content_get_entry( ed->ifd[ifd], tag )) ||
entry->format != EXIF_FORMAT_SHORT ||
entry->components != 1 )
return( -1 );
@ -507,7 +506,7 @@ set_vips_resolution( VipsImage *im, ExifData *ed )
*/
if( get_entry_double( ed, 0, EXIF_TAG_X_RESOLUTION, &xres ) ||
get_entry_double( ed, 0, EXIF_TAG_Y_RESOLUTION, &yres ) ||
get_entry_short( ed, 0, EXIF_TAG_RESOLUTION_UNIT, &unit ) ) {
get_entry_int( ed, 0, EXIF_TAG_RESOLUTION_UNIT, &unit ) ) {
vips_warn( "VipsJpeg",
"%s", _( "error reading resolution" ) );
return;

12
libvips/foreign/vips2jpeg.c
View File

@ -417,14 +417,12 @@ typedef void (*write_fn)( ExifData *ed,
/* Write a tag. Update what's there, or make a new one.
*/
static int
write_tag( ExifData *ed, int ifd,
ExifTag tag, ExifFormat format, write_fn fn, void *data )
write_tag( ExifData *ed, int ifd, ExifTag tag, write_fn fn, void *data )
{
ExifEntry *entry;
if( (entry = exif_content_get_entry( ed->ifd[ifd], tag )) ) {
if( entry->format == format )
fn( ed, entry, 0, data );
fn( ed, entry, 0, data );
}
else {
entry = exif_entry_new();
@ -484,11 +482,11 @@ set_exif_resolution( ExifData *ed, VipsImage *im )
/* Main image xres/yres/unit are in ifd0. ifd1 has the thumbnail
* xres/yres/unit.
*/
if( write_tag( ed, 0, EXIF_TAG_X_RESOLUTION, EXIF_FORMAT_RATIONAL,
if( write_tag( ed, 0, EXIF_TAG_X_RESOLUTION,
vips_exif_set_double, (void *) &xres ) ||
write_tag( ed, 0, EXIF_TAG_Y_RESOLUTION, EXIF_FORMAT_RATIONAL,
write_tag( ed, 0, EXIF_TAG_Y_RESOLUTION,
vips_exif_set_double, (void *) &yres ) ||
write_tag( ed, 0, EXIF_TAG_RESOLUTION_UNIT, EXIF_FORMAT_SHORT,
write_tag( ed, 0, EXIF_TAG_RESOLUTION_UNIT,
vips_exif_set_int, (void *) &unit ) ) {
vips_error( "VipsJpeg",
"%s", _( "error setting JPEG resolution" ) );