ppm.c

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/*
    This file is part of darktable,
    Copyright (C) 2010-2011 johannes hanika.
    Copyright (C) 2011 Henrik Andersson.
    Copyright (C) 2012 Richard Wonka.
    Copyright (C) 2013 Jérémy Rosen.
    Copyright (C) 2013 Pascal de Bruijn.
    Copyright (C) 2013, 2020 Pascal Obry.
    Copyright (C) 2013 Thomas Pryds.
    Copyright (C) 2013 Ulrich Pegelow.
    Copyright (C) 2014, 2016 Roman Lebedev.
    Copyright (C) 2014-2017, 2019-2020 Tobias Ellinghaus.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2025 Aurélien PIERRE.
    
    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/>.
*/
#include "system/mem_alloc.h"
#include "common/module_versioning.h"
#include "imageio/imageio_core.h"
#include "imageio/imageio_module.h"
#include "imageio/format/imageio_format_api.h"
#include <glib/gstdio.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
 
DT_MODULE(1)
 
void init(dt_imageio_module_format_t *self)
{
}
void cleanup(dt_imageio_module_format_t *self)
{
}
 
int write_image(dt_imageio_module_data_t *ppm, const char *filename, const void *in_tmp,
                dt_colorspaces_color_profile_type_t over_type, const char *over_filename,
                void *exif, int exif_len, int32_t imgid, int num, int total, struct dt_dev_pixelpipe_t *pipe,
                const gboolean export_masks)
{
  const uint16_t *in = (const uint16_t *)in_tmp;
  int status = 0;
  uint16_t *row = (uint16_t *)in;
  uint16_t swapped[3];
  FILE *f = g_fopen(filename, "wb");
  if(f)
  {
    (void)fprintf(f, "P6\n%d %d\n65535\n", ppm->width, ppm->height);
    for(int y = 0; y < ppm->height; y++)
    {
      for(int x = 0; x < ppm->width; x++)
      {
        for(int c = 0; c < 3; c++) swapped[c] = (0xff00 & (row[c] << 8)) | (row[c] >> 8);
        int cnt = fwrite(&swapped, sizeof(uint16_t), 3, f);
        if(cnt != 3) break;
        row += 4;
      }
    }
    fclose(f);
    status = 0;
  }
  return status;
}
 
size_t params_size(dt_imageio_module_format_t *self)
{
  return sizeof(dt_imageio_module_data_t);
}
 
void *get_params(dt_imageio_module_format_t *self)
{
  dt_imageio_module_data_t *d = (dt_imageio_module_data_t *)calloc(1, sizeof(dt_imageio_module_data_t));
  return d;
}
 
void free_params(dt_imageio_module_format_t *self, dt_imageio_module_data_t *params)
{
  dt_free(params);
}
 
int set_params(dt_imageio_module_format_t *self, const void *params, const int size)
{
  if(size != self->params_size(self)) return 1;
  return 0;
}
 
int bpp(dt_imageio_module_data_t *p)
{
  return 16;
}
 
int levels(dt_imageio_module_data_t *p)
{
  return IMAGEIO_RGB | IMAGEIO_INT16;
}
 
const char *mime(dt_imageio_module_data_t *data)
{
  return "image/x-portable-pixmap";
}
 
const char *extension(dt_imageio_module_data_t *data)
{
  return "ppm";
}
 
const char *name()
{
  return _("PPM (16-bit)");
}
 
// TODO: some quality/compression stuff?
void gui_init(dt_imageio_module_format_t *self)
{
}
void gui_cleanup(dt_imageio_module_format_t *self)
{
}
void gui_reset(dt_imageio_module_format_t *self)
{
}
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