/* Auto-rotate, if rotate_image is set.
*/
static VipsImage *
read_jpeg_rotate( VipsObject *process, VipsImage *im )
{
VipsImage **t = (VipsImage **) vips_object_local_array( process, 2 );
VipsAngle angle = vips_autorot_get_angle( im );
if( angle != VIPS_ANGLE_D0 ) {
/* Need to copy to memory or disc, we have to stay seq.
*/
const guint64 image_size = VIPS_IMAGE_SIZEOF_IMAGE( im );
const guint64 disc_threshold = vips_get_disc_threshold();
if( image_size > disc_threshold )
t[0] = vips_image_new_temp_file( "%s.v" );
else
t[0] = vips_image_new_memory();
if( vips_image_write( im, t[0] ) ||
vips_rot( t[0], &t[1], angle, NULL ) )
return( NULL );
im = t[1];
(void) vips_image_remove( im, ORIENTATION );
}
return( im );
}
/* Calculate the shrink factor, taking into account auto-rotate, the fit mode,
* and so on.
*/
static double
calculate_shrink( VipsImage *im )
{
VipsAngle angle = vips_autorot_get_angle( im );
gboolean rotate = angle == VIPS_ANGLE_D90 || angle == VIPS_ANGLE_D270;
int width = rotate_image && rotate ? im->Ysize : im->Xsize;
int height = rotate_image && rotate ? im->Xsize : im->Ysize;
VipsDirection direction;
/* Calculate the horizontal and vertical shrink we'd need to fit the
* image to the bounding box, and pick the biggest.
*
* In crop mode, we aim to fill the bounding box, so we must use the
* smaller axis.
*/
double horizontal = (double) width / thumbnail_width;
double vertical = (double) height / thumbnail_height;
if( crop_image ) {
if( horizontal < vertical )
direction = VIPS_DIRECTION_HORIZONTAL;
else
direction = VIPS_DIRECTION_VERTICAL;
}
else {
if( horizontal < vertical )
direction = VIPS_DIRECTION_VERTICAL;
else
direction = VIPS_DIRECTION_HORIZONTAL;
}
return( direction == VIPS_DIRECTION_HORIZONTAL ?
horizontal : vertical );
}
/* Read the jpeg from file or buffer.
*/
static int
vips__jpeg_read( ReadJpeg *jpeg, VipsImage *out, gboolean header_only )
{
/* Need to read in APP1 (EXIF metadata), APP2 (ICC profile), APP13
* (photoshop IPCT).
*/
jpeg_save_markers( &jpeg->cinfo, JPEG_APP0 + 1, 0xffff );
jpeg_save_markers( &jpeg->cinfo, JPEG_APP0 + 2, 0xffff );
jpeg_save_markers( &jpeg->cinfo, JPEG_APP0 + 13, 0xffff );
/* Convert!
*/
if( header_only ) {
if( read_jpeg_header( jpeg, out ) )
return( -1 );
/* Swap width and height if we're going to rotate this image.
*/
if( jpeg->autorotate ) {
VipsAngle angle = vips_autorot_get_angle( out );
if( angle == VIPS_ANGLE_D90 ||
angle == VIPS_ANGLE_D270 )
VIPS_SWAP( int, out->Xsize, out->Ysize );
/* We won't be returning an orientation tag.
*/
(void) vips_image_remove( out, ORIENTATION );
}
}
/* Auto-rotate, if rotate_image is set.
*/
static VipsImage *
thumbnail_rotate( VipsObject *process, VipsImage *im )
{
VipsImage **t = (VipsImage **) vips_object_local_array( process, 2 );
VipsAngle angle = vips_autorot_get_angle( im );
if( rotate_image &&
angle != VIPS_ANGLE_D0 ) {
vips_info( "vipsthumbnail", "rotating by %s",
vips_enum_nick( VIPS_TYPE_ANGLE, angle ) );
/* Need to copy to memory, we have to stay seq.
*/
t[0] = vips_image_new_memory();
if( vips_image_write( im, t[0] ) ||
vips_rot( t[0], &t[1], angle, NULL ) )
return( NULL );
im = t[1];
vips_autorot_remove_angle( im );
}
return( im );
}
