interpolation.h

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/* --------------------------------------------------------------------------
    This file is part of darktable,
    Copyright (C) 2012-2023 darktable developers.
 
    darktable 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 3 of the License, or
    (at your option) any later version.
 
    darktable 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 darktable.  If not, see <http://www.gnu.org/licenses/>.
* ------------------------------------------------------------------------*/
 
#pragma once
 
#include "common/opencl.h"
#include "develop/pixelpipe_hb.h"
 
G_BEGIN_DECLS
 
enum dt_interpolation_type
{
  DT_INTERPOLATION_FIRST = 0,                         
  DT_INTERPOLATION_BILINEAR = DT_INTERPOLATION_FIRST, 
  DT_INTERPOLATION_BICUBIC,                           
  DT_INTERPOLATION_LANCZOS2,                          
  DT_INTERPOLATION_LANCZOS3,                          
  DT_INTERPOLATION_LAST,                              
  DT_INTERPOLATION_DEFAULT = DT_INTERPOLATION_BILINEAR,
  DT_INTERPOLATION_DEFAULT_WARP = DT_INTERPOLATION_BICUBIC,
  DT_INTERPOLATION_USERPREF,  
  DT_INTERPOLATION_USERPREF_WARP  
};
 
typedef float (*dt_interpolation_func)(float *taps,
                                       size_t num_taps,
                                       float width,
                                       float first_tap,
                                       float interval);
 
struct dt_interpolation
{
  enum dt_interpolation_type id;     
  const char *name;                  
  size_t width;                      
  dt_interpolation_func maketaps;    
};
 
float dt_interpolation_compute_sample(const struct dt_interpolation *itor, const float *in, const float x,
                                      const float y, const int width, const int height,
                                      const int samplestride, const int linestride);
 
void dt_interpolation_compute_pixel4c(const struct dt_interpolation *itor, const float *in, float *out,
                                      const float x, const float y, const int width, const int height,
                                      const int linestride);
 
const struct dt_interpolation *dt_interpolation_new(enum dt_interpolation_type type);
 
void dt_interpolation_resample(const struct dt_interpolation *itor, float *out,
                               const dt_iop_roi_t *const roi_out,
                               const float *const in, const dt_iop_roi_t *const roi_in);
 
void dt_interpolation_resample_roi(const struct dt_interpolation *itor, float *out,
                                   const dt_iop_roi_t *const roi_out,
                                   const float *const in, const dt_iop_roi_t *const roi_in);
 
#ifdef HAVE_OPENCL
typedef struct dt_interpolation_cl_global_t
{
  int kernel_interpolation_resample;
} dt_interpolation_cl_global_t;
 
dt_interpolation_cl_global_t *dt_interpolation_init_cl_global(void);
 
void dt_interpolation_free_cl_global(dt_interpolation_cl_global_t *g);
 
 
int dt_interpolation_resample_cl(const struct dt_interpolation *itor, int devid, cl_mem dev_out,
                                 const dt_iop_roi_t *const roi_out, cl_mem dev_in,
                                 const dt_iop_roi_t *const roi_in);
 
int dt_interpolation_resample_roi_cl(const struct dt_interpolation *itor, int devid, cl_mem dev_out,
                                     const dt_iop_roi_t *const roi_out, cl_mem dev_in,
                                     const dt_iop_roi_t *const roi_in);
#endif
 
void dt_interpolation_resample_1c(const struct dt_interpolation *itor,
                                  float *out, const dt_iop_roi_t *const roi_out,
                                  const float *const in, const dt_iop_roi_t *const roi_in);
 
void dt_interpolation_resample_roi_1c(const struct dt_interpolation *itor,
                                      float *out, const dt_iop_roi_t *const roi_out,
                                      const float *const in, const dt_iop_roi_t *const roi_in);
 
G_END_DECLS
 
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