87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
/* Bicubic (catmull-rom) interpolator.
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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_BICUBIC_H
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#define VIPS_BICUBIC_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_BICUBIC \
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(vips_interpolate_bicubic_get_type())
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#define VIPS_INTERPOLATE_BICUBIC( obj ) \
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(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
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VIPS_TYPE_INTERPOLATE_BICUBIC, VipsInterpolateBicubic ))
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#define VIPS_INTERPOLATE_BICUBIC_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_CAST( (klass), \
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VIPS_TYPE_INTERPOLATE_BICUBIC, VipsInterpolateBicubicClass))
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#define VIPS_IS_INTERPOLATE_BICUBIC( obj ) \
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(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_INTERPOLATE_BICUBIC ))
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#define VIPS_IS_INTERPOLATE_BICUBIC_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_INTERPOLATE_BICUBIC ))
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#define VIPS_INTERPOLATE_BICUBIC_GET_CLASS( obj ) \
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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VIPS_TYPE_INTERPOLATE_BICUBIC, VipsInterpolateBicubicClass ))
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typedef struct _VipsInterpolateBicubic {
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VipsInterpolate parent_object;
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} VipsInterpolateBicubic;
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typedef struct _VipsInterpolateBicubicClass {
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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 double (for all others). We go to scale + 1, so
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* we can round-to-nearest safely.
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*/
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/* We could keep a large set of 2d 4x4 matricies, but this actually
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* works out slower, since for many resizes the thing will no longer
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* fit in L1.
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*/
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int matrixi[VIPS_TRANSFORM_SCALE + 1][4];
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double matrixf[VIPS_TRANSFORM_SCALE + 1][4];
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} VipsInterpolateBicubicClass;
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GType vips_interpolate_bicubic_get_type( void );
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VipsInterpolate *vips_interpolate_bicubic_new( void );
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/* Convenience: return a static default bicubic, so no need to free it.
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*/
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VipsInterpolate *vips_interpolate_bicubic_static( void );
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#ifdef __cplusplus
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}
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#endif /*__cplusplus*/
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#endif /*VIPS_BICUBIC_H*/
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