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69 lines
2.3 KiB
69 lines
2.3 KiB
13 years ago
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/* Libart_LGPL - library of basic graphic primitives
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* Copyright (C) 1998 Raph Levien
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __ART_FILTERLEVEL_H__
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#define __ART_FILTERLEVEL_H__
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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typedef enum {
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ART_FILTER_NEAREST,
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ART_FILTER_TILES,
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ART_FILTER_BILINEAR,
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ART_FILTER_HYPER
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} ArtFilterLevel;
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/* NEAREST is nearest neighbor. It is the fastest and lowest quality.
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TILES is an accurate simulation of the PostScript image operator
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without any interpolation enabled; each pixel is rendered as a tiny
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parallelogram of solid color, the edges of which are implemented
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with antialiasing. It resembles nearest neighbor for enlargement,
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and bilinear for reduction.
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BILINEAR is bilinear interpolation. For enlargement, it is
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equivalent to point-sampling the ideal bilinear-interpolated
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image. For reduction, it is equivalent to laying down small tiles
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and integrating over the coverage area.
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HYPER is the highest quality reconstruction function. It is derived
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from the hyperbolic filters in Wolberg's "Digital Image Warping,"
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and is formally defined as the hyperbolic-filter sampling the ideal
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hyperbolic-filter interpolated image (the filter is designed to be
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idempotent for 1:1 pixel mapping). It is the slowest and highest
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quality.
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Note: at this stage of implementation, most filter modes are likely
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not to be implemented.
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Note: cubic filtering is missing from this list, because there isn't
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much point - hyper is just as fast to implement and slightly better
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in quality.
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*/
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __ART_PATHCODE_H__ */
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