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82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
/* Copyright (C) 2006 TightVNC Team. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU 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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*
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* This software 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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// -=- ScaleFilters.h
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//
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// Definitions of the 1-D filters and routines using for the image scaling.
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//
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//
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namespace rfb {
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#define SCALE_ERROR (1e-7)
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#define BITS_OF_CHANEL 8
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#define BITS_OF_WEIGHT 14
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#define FINALSHIFT (2 * BITS_OF_WEIGHT - BITS_OF_CHANEL)
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#define WEIGHT_OF_ONE (1 << BITS_OF_WEIGHT)
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typedef double (*filter_func)(double x);
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const double pi = 3.14159265358979;
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const unsigned int scaleFilterNearestNeighbor = 0;
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const unsigned int scaleFilterBilinear = 1;
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const unsigned int scaleFilterBicubic = 2;
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const unsigned int scaleFilterMaxNumber = 2;
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const unsigned int defaultScaleFilter = scaleFilterBilinear;
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//
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// -=- Scale filters structures and routines
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//
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// Scale filter stuct
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typedef struct {
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char name[30]; // Filter name
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double radius; // Radius where filter function is nonzero
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filter_func func; // Pointer to filter function
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} SFilter;
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// Scale filter weight table
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typedef struct {
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short i0, i1; // Filter function interval, [i0..i1)
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short *weight; // Weight coefficients on the filter function interval
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} SFilterWeightTab;
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// ScaleFilters class helps us using a set of 1-d scale filters.
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class ScaleFilters {
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public:
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ScaleFilters() { initFilters(); };
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SFilter &operator[](unsigned int filter_id);
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int getFilterIdByName(char *filterName);
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void makeWeightTabs(int filter, int src_x, int dst_x, SFilterWeightTab **weightTabs);
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protected:
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void initFilters();
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SFilter create(const char *name_, double radius_, filter_func func_);
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SFilter filters[scaleFilterMaxNumber+1];
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};
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};
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