186 lines
6.2 KiB
C
186 lines
6.2 KiB
C
/* Various interpolators.
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*
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* J.Cupitt, 15/10/08
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifndef VIPS_INTERPOLATE_H
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#define VIPS_INTERPOLATE_H
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#ifdef __cplusplus
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extern "C" {
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#endif /*__cplusplus*/
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#define VIPS_TYPE_INTERPOLATE (vips_interpolate_get_type())
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#define VIPS_INTERPOLATE( obj ) \
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(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
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VIPS_TYPE_INTERPOLATE, VipsInterpolate ))
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#define VIPS_INTERPOLATE_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_CAST( (klass), \
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VIPS_TYPE_INTERPOLATE, VipsInterpolateClass))
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#define VIPS_IS_INTERPOLATE( obj ) \
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(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_INTERPOLATE ))
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#define VIPS_IS_INTERPOLATE_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_INTERPOLATE ))
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#define VIPS_INTERPOLATE_GET_CLASS( obj ) \
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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VIPS_TYPE_INTERPOLATE, VipsInterpolateClass ))
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typedef struct _VipsInterpolate {
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VipsObject parent_object;
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} VipsInterpolate;
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/* An interpolation function. This is a class method, but we have a lookup
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* function for it to speed up dispatch. Write to the memory at "out",
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* interpolate the value at position (x, y) in "in".
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*/
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typedef void (*VipsInterpolateMethod)( VipsInterpolate *,
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PEL *out, REGION *in, double x, double y );
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typedef struct _VipsInterpolateClass {
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VipsObjectClass parent_class;
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/* Write to pixel out(x,y), interpolating from in(x,y). The caller has
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* to set the regions up.
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*/
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VipsInterpolateMethod interpolate;
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/* This interpolator needs a window this many pixels across and down.
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*/
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int (*get_window_size)( VipsInterpolate * );
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/* Or just set this if you want constant.
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*/
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int window_size;
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} VipsInterpolateClass;
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GType vips_interpolate_get_type( void );
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void vips_interpolate( VipsInterpolate *interpolate,
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PEL *out, REGION *in, double x, double y );
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VipsInterpolateMethod vips_interpolate_get_method( VipsInterpolate * );
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int vips_interpolate_get_window_size( VipsInterpolate *interpolate );
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/* Nearest class starts.
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*/
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#define VIPS_TYPE_INTERPOLATE_NEAREST (vips_interpolate_nearest_get_type())
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#define VIPS_INTERPOLATE_NEAREST( obj ) \
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(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
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VIPS_TYPE_INTERPOLATE_NEAREST, VipsInterpolateNearest ))
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#define VIPS_INTERPOLATE_NEAREST_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_CAST( (klass), \
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VIPS_TYPE_INTERPOLATE_NEAREST, VipsInterpolateNearestClass))
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#define VIPS_IS_INTERPOLATE_NEAREST( obj ) \
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(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_INTERPOLATE_NEAREST ))
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#define VIPS_IS_INTERPOLATE_NEAREST_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_INTERPOLATE_NEAREST ))
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#define VIPS_INTERPOLATE_NEAREST_GET_CLASS( obj ) \
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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VIPS_TYPE_INTERPOLATE_NEAREST, VipsInterpolateNearestClass ))
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typedef struct _VipsInterpolateNearest {
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VipsInterpolate parent_object;
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} VipsInterpolateNearest;
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typedef struct _VipsInterpolateNearestClass {
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VipsInterpolateClass parent_class;
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} VipsInterpolateNearestClass;
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VipsInterpolate *vips_interpolate_nearest_new( void );
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GType vips_interpolate_nearest_get_type( void );
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/* Convenience: return a static fast nearest, so no need to free it.
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*/
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VipsInterpolate *vips_interpolate_nearest_static( void );
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/* Bilinear class starts.
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*/
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/* How many bits of precision we keep for transformations, ie. how many
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* pre-computed matricies we have.
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*/
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#define VIPS_TRANSFORM_SHIFT (5)
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#define VIPS_TRANSFORM_SCALE (1 << VIPS_TRANSFORM_SHIFT)
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/* How many bits of precision we keep for interpolation, ie. where the decimal
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* is in the fixed-point tables. For 16-bit pixels, we need 16 bits for the
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* data, 4 bits to add 16 values together, another bit for the sign and some
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* other stuff, so say 24 total. That leaves 8 bits for the fractional part.
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*/
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#define VIPS_INTERPOLATE_SHIFT (8)
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#define VIPS_INTERPOLATE_SCALE (1 << VIPS_INTERPOLATE_SHIFT)
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#define VIPS_TYPE_INTERPOLATE_BILINEAR (vips_interpolate_bilinear_get_type())
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#define VIPS_INTERPOLATE_BILINEAR( obj ) \
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(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
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VIPS_TYPE_INTERPOLATE_BILINEAR, VipsInterpolateBilinear ))
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#define VIPS_INTERPOLATE_BILINEAR_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_CAST( (klass), \
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VIPS_TYPE_INTERPOLATE_BILINEAR, VipsInterpolateBilinearClass))
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#define VIPS_IS_INTERPOLATE_BILINEAR( obj ) \
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(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_INTERPOLATE_BILINEAR ))
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#define VIPS_IS_INTERPOLATE_BILINEAR_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_INTERPOLATE_BILINEAR ))
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#define VIPS_INTERPOLATE_BILINEAR_GET_CLASS( obj ) \
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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VIPS_TYPE_INTERPOLATE_BILINEAR, VipsInterpolateBilinearClass ))
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typedef struct _VipsInterpolateBilinear {
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VipsInterpolate parent_object;
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} VipsInterpolateBilinear;
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typedef struct _VipsInterpolateBilinearClass {
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VipsInterpolateClass parent_class;
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/* Precalculated interpolation matricies. int (used for pel sizes up
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* to short), and float (for all others). We go to scale + 1, so
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* we can round-to-nearest safely. Don't bother with double, since
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* this is an approximation anyway.
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*/
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int matrixi[VIPS_TRANSFORM_SCALE + 1][VIPS_TRANSFORM_SCALE + 1][4];
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float matrixd[VIPS_TRANSFORM_SCALE + 1][VIPS_TRANSFORM_SCALE + 1][4];
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} VipsInterpolateBilinearClass;
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GType vips_interpolate_bilinear_get_type( void );
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VipsInterpolate *vips_interpolate_bilinear_new( void );
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/* Convenience: return a static bilinear, so no need to free it.
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*/
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VipsInterpolate *vips_interpolate_bilinear_static( void );
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#ifdef __cplusplus
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}
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#endif /*__cplusplus*/
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#endif /*VIPS_INTERPOLATE_H*/
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