static void*
interp_register(VipsInterpolateClass *itrp, void *hash)
{
VipsInterpolate *inst;
VipsObjectClass *klass = (VipsObjectClass*) itrp;;
VALUE obj, hVIPSInterpolators = (VALUE)hash;
inst = vips_interpolate_new(klass->nickname);
obj = Data_Wrap_Struct(cVIPSInterpolator, 0, 0, inst);
rb_hash_aset(hVIPSInterpolators, ID2SYM(rb_intern(klass->nickname)), obj);
return NULL;
}
int
main( int argc, char **argv )
{
VipsImage *global;
VipsImage **t;
if( VIPS_INIT( argv[0] ) )
return( -1 );
global = vips_image_new();
t = (VipsImage **) vips_object_local_array( VIPS_OBJECT( global ), 5 );
VipsInterpolate *interp = vips_interpolate_new( "bilinear" );
if( !(t[0] = vips_image_new_from_file( argv[1],
"access", VIPS_ACCESS_SEQUENTIAL,
NULL )) )
vips_error_exit( NULL );
t[1] = vips_image_new_matrixv( 3, 3,
-1.0, -1.0, -1.0,
-1.0, 16.0, -1.0,
-1.0, -1.0, -1.0 );
vips_image_set_double( t[1], "scale", 8 );
if( vips_extract_area( t[0], &t[2],
100, 100, t[0]->Xsize - 200, t[0]->Ysize - 200, NULL ) ||
vips_similarity( t[2], &t[3],
"scale", 0.9,
"interpolate", interp,
NULL ) ||
vips_conv( t[3], &t[4], t[1], NULL ) ||
vips_image_write_to_file( t[4], argv[2], NULL ) )
vips_error_exit( NULL );
g_object_unref( global );
g_object_unref( interp );
return( 0 );
}
static int
vips_mosaic1_build( VipsObject *object )
{
VipsMosaic1 *mosaic1 = (VipsMosaic1 *) object;
joinfn jfn;
g_object_set( mosaic1, "out", vips_image_new(), NULL );
if( VIPS_OBJECT_CLASS( vips_mosaic1_parent_class )->build( object ) )
return( -1 );
if( !mosaic1->interpolate )
mosaic1->interpolate = vips_interpolate_new( "bilinear" );
jfn = mosaic1->direction == VIPS_DIRECTION_HORIZONTAL ?
im__lrmerge1 : im__tbmerge1;
if( mosaic1->search ) {
if( rotjoin_search( mosaic1->ref, mosaic1->sec, mosaic1->out,
jfn,
mosaic1->bandno,
mosaic1->xr1, mosaic1->yr1, mosaic1->xs1, mosaic1->ys1,
mosaic1->xr2, mosaic1->yr2, mosaic1->xs2, mosaic1->ys2,
mosaic1->hwindow, mosaic1->harea,
0,
mosaic1->mblend ) )
return( -1 );
}
else {
if( rotjoin( mosaic1->ref, mosaic1->sec, mosaic1->out,
jfn,
mosaic1->xr1, mosaic1->yr1, mosaic1->xs1, mosaic1->ys1,
mosaic1->xr2, mosaic1->yr2, mosaic1->xs2, mosaic1->ys2,
mosaic1->mblend ) )
return( -1 );
}
return( 0 );
}
static int
vips_resize_build( VipsObject *object )
{
VipsResample *resample = VIPS_RESAMPLE( object );
VipsResize *resize = (VipsResize *) object;
VipsImage **t = (VipsImage **)
vips_object_local_array( object, 7 );
VipsImage *in;
int window_size;
int int_shrink;
int int_shrink_width;
double residual;
double sigma;
if( VIPS_OBJECT_CLASS( vips_resize_parent_class )->build( object ) )
return( -1 );
if( !vips_object_argument_isset( object, "interpolate" ) ) {
VipsInterpolate *interpolate;
char *nick;
if( vips_type_find( "VipsInterpolate", "bicubic" ) )
nick = "bicubic";
else
nick = "bilinear";
interpolate = vips_interpolate_new( nick );
g_object_set( object, "interpolate", interpolate, NULL );
VIPS_UNREF( interpolate );
}
in = resample->in;
window_size = resize->interpolate ?
vips_interpolate_get_window_size( resize->interpolate ) : 2;
/* If the factor is > 1.0, we need to zoom rather than shrink.
* Just set the int part to 1 in this case.
*/
int_shrink = resize->scale > 1.0 ? 1 : floor( 1.0 / resize->scale );
/* We want to shrink by less for interpolators with larger windows.
*/
int_shrink = VIPS_MAX( 1,
int_shrink / VIPS_MAX( 1, window_size / 2 ) );
/* Size after int shrink.
*/
int_shrink_width = in->Xsize / int_shrink;
/* Therefore residual scale factor is.
*/
residual = (in->Xsize * resize->scale) / int_shrink_width;
/* A copy for enlarge resize.
*/
if( vips_shrink( in, &t[0], int_shrink, int_shrink, NULL ) )
return( -1 );
in = t[0];
/* We want to make sure we read the image sequentially.
* However, the convolution we may be doing later will force us
* into SMALLTILE or maybe FATSTRIP mode and that will break
* sequentiality.
*
* So ... read into a cache where tiles are scanlines, and make sure
* we keep enough scanlines to be able to serve a line of tiles.
*
* We use a threaded tilecache to avoid a deadlock: suppose thread1,
* evaluating the top block of the output, is delayed, and thread2,
* evaluating the second block, gets here first (this can happen on
* a heavily-loaded system).
*
* With an unthreaded tilecache (as we had before), thread2 will get
* the cache lock and start evaling the second block of the shrink.
* When it reaches the png reader it will stall until the first block
* has been used ... but it never will, since thread1 will block on
* this cache lock.
*/
if( int_shrink > 1 ) {
int tile_width;
int tile_height;
int nlines;
vips_get_tile_size( in,
&tile_width, &tile_height, &nlines );
if( vips_tilecache( in, &t[6],
"tile_width", in->Xsize,
"tile_height", 10,
"max_tiles", 1 + (nlines * 2) / 10,
"access", VIPS_ACCESS_SEQUENTIAL,
"threaded", TRUE,
NULL ) )
return( -1 );
in = t[6];
}
/* If the final affine will be doing a large downsample, we can get
* nasty aliasing on hard edges. Blur before affine to smooth this out.
*
* Don't blur for very small shrinks, blur with radius 1 for x1.5
* shrinks, blur radius 2 for x2.5 shrinks and above, etc.
*/
sigma = ((1.0 / residual) - 0.5) / 1.5;
if( residual < 1.0 &&
sigma > 0.1 ) {
if( vips_gaussblur( in, &t[2], sigma, NULL ) )
return( -1 );
in = t[2];
}
if( vips_affine( in, &t[3], residual, 0, 0, residual,
"interpolate", resize->interpolate,
"idx", resize->idx,
"idy", resize->idy,
NULL ) )
return( -1 );
in = t[3];
/* If we are upsampling, don't sharpen.
*/
if( int_shrink > 1 ) {
t[5] = vips_image_new_matrixv( 3, 3,
-1.0, -1.0, -1.0,
-1.0, 32.0, -1.0,
-1.0, -1.0, -1.0 );
vips_image_set_double( t[5], "scale", 24 );
if( vips_conv( in, &t[4], t[5], NULL ) )
return( -1 );
in = t[4];
}
if( vips_image_write( in, resample->out ) )
return( -1 );
return( 0 );
}