mirror of
https://github.com/kasmtech/KasmVNC.git
synced 2024-11-07 16:54:13 +01:00
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
/* 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];
|
|
};
|
|
|
|
};
|