scalepixels.c

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/*
    This file is part of darktable,
    Copyright (C) 2014 Pascal de Bruijn.
    Copyright (C) 2014, 2016 Roman Lebedev.
    Copyright (C) 2014, 2016, 2019 Tobias Ellinghaus.
    Copyright (C) 2015 Pedro Côrte-Real.
    Copyright (C) 2017 Heiko Bauke.
    Copyright (C) 2018, 2020, 2023, 2025-2026 Aurélien PIERRE.
    Copyright (C) 2018 Edgardo Hoszowski.
    Copyright (C) 2018 Maurizio Paglia.
    Copyright (C) 2018-2020, 2022 Pascal Obry.
    Copyright (C) 2018 rawfiner.
    Copyright (C) 2019-2020 Aldric Renaudin.
    Copyright (C) 2019 Andreas Schneider.
    Copyright (C) 2020 Diederik Ter Rahe.
    Copyright (C) 2020 Ralf Brown.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2022 Philipp Lutz.
    
    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/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "bauhaus/bauhaus.h"
#include "common/interpolation.h"
#include "develop/imageop.h"
#include "develop/tiling.h"
 
#include "gui/gtk.h"
#include "iop/iop_api.h"
 
#include <gtk/gtk.h>
#include <stdlib.h>
 
DT_MODULE_INTROSPECTION(1, dt_iop_scalepixels_params_t)
 
typedef struct dt_iop_scalepixels_params_t
{
  // Aspect ratio of the pixels, usually 1 but some cameras need scaling
  // <1 means the image needs to be stretched vertically, (0.5 means 2x)
  // >1 means the image needs to be stretched horizontally (2 mean 2x)
  float pixel_aspect_ratio; // $DEFAULT: 1.0f
} dt_iop_scalepixels_params_t;
 
typedef struct dt_iop_scalepixels_gui_data_t
{
} dt_iop_scalepixels_gui_data_t;
 
typedef struct dt_iop_scalepixels_data_t {
  float pixel_aspect_ratio;
  float x_scale;
  float y_scale;
} dt_iop_scalepixels_data_t;
 
const char *name()
{
  return C_("modulename", "scale pixels");
}
 
int flags()
{
  return IOP_FLAGS_ALLOW_TILING | IOP_FLAGS_TILING_FULL_ROI | IOP_FLAGS_ONE_INSTANCE
    | IOP_FLAGS_UNSAFE_COPY;
}
 
int default_group()
{
  return IOP_GROUP_TECHNICAL;
}
 
int operation_tags()
{
  return IOP_TAG_DISTORT;
}
 
int default_colorspace(dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, const dt_dev_pixelpipe_iop_t *piece)
{
  return IOP_CS_RGB;
}
 
const char **description(struct dt_iop_module_t *self)
{
  return dt_iop_set_description(self,
                                _("internal module to setup technical specificities of raw sensor.\n\n"
                                  "you should not touch values here !"),
                                NULL, NULL, NULL, NULL);
}
 
static void transform(const dt_dev_pixelpipe_iop_t *const piece, float *p)
{
  dt_iop_scalepixels_data_t *d = piece->data;
 
  if(d->pixel_aspect_ratio < 1.0f)
  {
    p[1] /= d->pixel_aspect_ratio;
  }
  else
  {
    p[0] *= d->pixel_aspect_ratio;
  }
}
 
static void precalculate_scale(dt_iop_module_t *self, const dt_dev_pixelpipe_t *pipe,
                               const dt_dev_pixelpipe_iop_t *piece)
{
  // Since the scaling is calculated by modify_roi_in use that to get them
  // This doesn't seem strictly needed but since clipping.c also does it we try
  // and avoid breaking any assumptions elsewhere in the code
  dt_dev_pixelpipe_iop_t piece_copy = *piece;
  dt_iop_roi_t roi_out, roi_in;
  roi_out.width = piece->buf_in.width;
  roi_out.height = piece->buf_in.height;
  self->modify_roi_in(self, pipe, &piece_copy, &roi_out, &roi_in);
}
 
int distort_transform(dt_iop_module_t *self, const dt_dev_pixelpipe_t *pipe, const dt_dev_pixelpipe_iop_t *piece,
                      float *points, size_t points_count)
{
  precalculate_scale(self, pipe, piece);
  dt_iop_scalepixels_data_t *d = piece->data;
 
  for(size_t i = 0; i < points_count * 2; i += 2)
  {
    points[i] /= d->x_scale;
    points[i+1] /= d->y_scale;
  }
 
  return 1;
}
 
int distort_backtransform(dt_iop_module_t *self, const dt_dev_pixelpipe_t *pipe, const dt_dev_pixelpipe_iop_t *piece,
                          float *points, size_t points_count)
{
  precalculate_scale(self, pipe, piece);
  dt_iop_scalepixels_data_t *d = piece->data;
 
  for(size_t i = 0; i < points_count * 2; i += 2)
  {
    points[i] *= d->x_scale;
    points[i+1] *= d->y_scale;
  }
 
  return 1;
}
 
void distort_mask(struct dt_iop_module_t *self, const struct dt_dev_pixelpipe_t *pipe, struct dt_dev_pixelpipe_iop_t *piece,
                  const float *const in, float *const out, const dt_iop_roi_t *const roi_in,
                  const dt_iop_roi_t *const roi_out)
{
  (void)pipe;
  // TODO
  memset(out, 0, sizeof(float) * roi_out->width * roi_out->height);
  fprintf(stderr, "TODO: implement %s() in %s\n", __FUNCTION__, __FILE__);
}
 
void modify_roi_out(dt_iop_module_t *self, const dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece,
                    dt_iop_roi_t *roi_out,
                    const dt_iop_roi_t *const roi_in)
{
  *roi_out = *roi_in;
 
  float xy[2] = { roi_out->x, roi_out->y };
  float wh[2] = { roi_out->width, roi_out->height };
 
  transform(piece, xy);
  transform(piece, wh);
 
  roi_out->x = (int)floorf(xy[0]);
  roi_out->y = (int)floorf(xy[1]);
  roi_out->width = (int)ceilf(wh[0]);
  roi_out->height = (int)ceilf(wh[1]);
 
  // sanity check.
  if(roi_out->x < 0) roi_out->x = 0;
  if(roi_out->y < 0) roi_out->y = 0;
  if(roi_out->width < 1) roi_out->width = 1;
  if(roi_out->height < 1) roi_out->height = 1;
}
 
void modify_roi_in(dt_iop_module_t *self, const dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece,
                   const dt_iop_roi_t *const roi_out,
                   dt_iop_roi_t *roi_in)
{
  *roi_in = *roi_out;
 
  // If possible try to get an image that's strictly larger than what we want to output
  float hw[2] = {roi_out->height, roi_out->width};
  transform(piece, hw); // transform() is used reversed here intentionally
  roi_in->height = hw[0];
  roi_in->width = hw[1];
 
  float reduction_ratio = MAX(hw[0] / (piece->buf_in.height * 1.0f), hw[1] / (piece->buf_in.width * 1.0f));
  if (reduction_ratio > 1.0f)
  {
    roi_in->height /= reduction_ratio;
    roi_in->width /= reduction_ratio;
  }
 
  dt_iop_scalepixels_data_t *d = piece->data;
  d->x_scale = (roi_in->width * 1.0f) / (roi_out->width * 1.0f);
  d->y_scale = (roi_in->height * 1.0f) / (roi_out->height * 1.0f);
 
  roi_in->scale = roi_out->scale * MAX(d->x_scale, d->y_scale);
  roi_in->x = roi_out->x * d->x_scale;
  roi_in->y = roi_out->y * d->y_scale;
}
 
__DT_CLONE_TARGETS__
int process(dt_iop_module_t *self, const dt_dev_pixelpipe_t *pipe, const dt_dev_pixelpipe_iop_t *piece,
            const void *const ivoid, void *const ovoid)
{
  (void)pipe;
  const dt_iop_roi_t *const roi_in = &piece->roi_in;
  const dt_iop_roi_t *const roi_out = &piece->roi_out;
  const int ch = piece->dsc_in.channels;
  const int ch_width = ch * roi_in->width;
  const struct dt_interpolation *interpolation = dt_interpolation_new(DT_INTERPOLATION_USERPREF);
  const dt_iop_scalepixels_data_t * const d = piece->data;
  __OMP_PARALLEL_FOR__()
  // (slow) point-by-point transformation.
  // TODO: optimize with scanlines and linear steps between?
  for(int j = 0; j < roi_out->height; j++)
  {
    float *out = ((float *)ovoid) + (size_t)4 * j * roi_out->width;
    for(int i = 0; i < roi_out->width; i++, out += 4)
    {
      float x = i*d->x_scale;
      float y = j*d->y_scale;
 
      dt_interpolation_compute_pixel4c(interpolation, (float *)ivoid, out, x, y, roi_in->width,
                                       roi_in->height, ch_width);
    }
  }
  return 0;
}
 
void commit_params(dt_iop_module_t *self, dt_iop_params_t *params, dt_dev_pixelpipe_t *pipe,
                   dt_dev_pixelpipe_iop_t *piece)
{
  const dt_iop_scalepixels_params_t *p = params;
  dt_iop_scalepixels_data_t *d = piece->data;
 
  d->pixel_aspect_ratio = p->pixel_aspect_ratio;
  d->x_scale = 1.0f;
  d->y_scale = 1.0f;
 
  if(isnan(p->pixel_aspect_ratio) || p->pixel_aspect_ratio <= 0.0f || p->pixel_aspect_ratio == 1.0f)
    piece->enabled = 0;
}
 
void init_pipe(dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
  piece->data = dt_calloc_align(sizeof(dt_iop_scalepixels_data_t));
  piece->data_size = sizeof(dt_iop_scalepixels_data_t);
}
 
void cleanup_pipe(dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
  dt_free_align(piece->data);
  piece->data = NULL;
}
 
void reload_defaults(dt_iop_module_t *self)
{
  dt_iop_scalepixels_params_t *d = self->default_params;
 
  const dt_image_t *const image = &(self->dev->image_storage);
 
  d->pixel_aspect_ratio = image->pixel_aspect_ratio;
 
  self->default_enabled = (!isnan(d->pixel_aspect_ratio) &&
                           d->pixel_aspect_ratio > 0.0f &&
                           d->pixel_aspect_ratio != 1.0f);
 
  // FIXME: does not work.
  self->hide_enable_button = !self->default_enabled;
 
  if(self->widget)
    gtk_label_set_text(GTK_LABEL(self->widget), self->default_enabled
                       ? _("automatic pixel scaling")
                       :_("automatic pixel scaling\nonly works for the sensors that need it."));
}
 
void gui_update(dt_iop_module_t *self)
{
}
 
void gui_init(dt_iop_module_t *self)
{
  IOP_GUI_ALLOC(scalepixels);
 
  self->widget = dt_ui_label_new("");
  gtk_label_set_line_wrap(GTK_LABEL(self->widget), TRUE);
 
}
 
// clang-format off
// modelines: These editor modelines have been set for all relevant files by tools/update_modelines.py
// vim: shiftwidth=2 expandtab tabstop=2 cindent
// kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-spaces modified;
// clang-format on