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- /* Copyright (C) 2006 TightVNC Team. All Rights Reserved.
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- * USA.
- */
-
- // -=- ScaleFilters.h
- //
- // Definitions of the 1-D filters and routines using for the image scaling.
- //
- //
-
- namespace rfb {
-
- #define SCALE_ERROR (1e-7)
- #define BITS_OF_CHANEL 8
- #define BITS_OF_WEIGHT 14
- #define FINALSHIFT (2 * BITS_OF_WEIGHT - BITS_OF_CHANEL)
- #define WEIGHT_OF_ONE (1 << BITS_OF_WEIGHT)
-
- typedef double (*filter_func)(double x);
-
- const double pi = 3.14159265358979;
-
- const unsigned int scaleFilterNearestNeighbor = 0;
- const unsigned int scaleFilterBilinear = 1;
- const unsigned int scaleFilterBicubic = 2;
-
- const unsigned int scaleFilterMaxNumber = 2;
- const unsigned int defaultScaleFilter = scaleFilterBilinear;
-
- //
- // -=- Scale filters structures and routines
- //
-
- // Scale filter stuct
- typedef struct {
- char name[30]; // Filter name
- double radius; // Radius where filter function is nonzero
- filter_func func; // Pointer to filter function
- } SFilter;
-
- // Scale filter weight table
- typedef struct {
- short i0, i1; // Filter function interval, [i0..i1)
- short *weight; // Weight coefficients on the filter function interval
- } SFilterWeightTab;
-
-
- // ScaleFilters class helps us using a set of 1-d scale filters.
- class ScaleFilters {
- public:
- ScaleFilters() { initFilters(); };
-
- SFilter &operator[](unsigned int filter_id);
-
- int getFilterIdByName(char *filterName);
-
- void makeWeightTabs(int filter, int src_x, int dst_x, SFilterWeightTab **weightTabs);
-
- protected:
- void initFilters();
-
- SFilter create(const char *name_, double radius_, filter_func func_);
-
- SFilter filters[scaleFilterMaxNumber+1];
- };
-
- };
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