watermark.c

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/*
    This file is part of darktable,
    Copyright (C) 2010 Bruce Guenter.
    Copyright (C) 2010-2011 Henrik Andersson.
    Copyright (C) 2010-2013, 2016 johannes hanika.
    Copyright (C) 2010, 2012 José Carlos García Sogo.
    Copyright (C) 2010-2019 Tobias Ellinghaus.
    Copyright (C) 2011 Antony Dovgal.
    Copyright (C) 2011-2012 Jérémy Rosen.
    Copyright (C) 2011 Olivier Tribout.
    Copyright (C) 2011 Robert Bieber.
    Copyright (C) 2012 Christian Tellefsen.
    Copyright (C) 2012 Edouard Gomez.
    Copyright (C) 2012 Jean-Sébastien Pédron.
    Copyright (C) 2012 Richard Wonka.
    Copyright (C) 2012 Simon Spannagel.
    Copyright (C) 2012, 2014 Ulrich Pegelow.
    Copyright (C) 2013 bleader.
    Copyright (C) 2013 hal.
    Copyright (C) 2013-2015, 2018-2022 Pascal Obry.
    Copyright (C) 2013-2016 Roman Lebedev.
    Copyright (C) 2015 Pedro Côrte-Real.
    Copyright (C) 2016, 2020, 2022 Aldric Renaudin.
    Copyright (C) 2017 luzpaz.
    Copyright (C) 2018-2020, 2023, 2025-2026 Aurélien PIERRE.
    Copyright (C) 2018-2019 Edgardo Hoszowski.
    Copyright (C) 2018-2019, 2021 Heiko Bauke.
    Copyright (C) 2018 Maurizio Paglia.
    Copyright (C) 2018 rawfiner.
    Copyright (C) 2019-2020, 2022 Philippe Weyland.
    Copyright (C) 2019 Robert Bridge.
    Copyright (C) 2020 Chris Elston.
    Copyright (C) 2020-2022 Diederik Ter Rahe.
    Copyright (C) 2020 Hanno Schwalm.
    Copyright (C) 2020 hatsunearu.
    Copyright (C) 2020 Hubert Kowalski.
    Copyright (C) 2020-2021 Marco.
    Copyright (C) 2020-2021 Ralf Brown.
    Copyright (C) 2021 Benjamin Grimm-Lebsanft.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2022 Philipp Lutz.
    Copyright (C) 2023 Luca Zulberti.
    Copyright (C) 2023 Ricky Moon.
    
    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 "common/global_mutexes.h"
#include "common/paths.h"   // DT_PATH_MAX
#include "system/macros.h"
#include "common/module_versioning.h"
#include "system/mem_alloc.h"
#include "system/openmp.h"
#include "system/target_clones.h"
#include "common/conf.h"
#include "widgets/bauhaus.h"
#include "common/imagebuf.h"
#include "common/variables.h"
#include "develop/develop.h"
#include "develop/imageop.h"
#include "develop/imageop_gui.h"
#include "widgets/button.h"
#include "develop/imageop_gui.h"
#include "widgets/togglebutton.h"
 
#include "gui/color_picker_proxy.h"
#include "iop/iop_api.h"
#include <assert.h>
#include <gtk/gtk.h>
#include <inttypes.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
 
#include <librsvg/rsvg.h>
// ugh, ugly hack. why do people break stuff all the time?
#ifndef RSVG_CAIRO_H
#include <librsvg/rsvg-cairo.h>
#endif
 
#include "common/file_location.h"
#include "common/utility.h"
#include "widgets/accelerators.h"
#include "widgets/container.h"
#include "widgets/label.h"
 
/* rsvg, and the cairo underneath it, are not thread safe -- notably around font handling.
 * This module is the only place in the pixel path that drives them, so the lock lives here
 * rather than in a process-wide "plugin" mutex shared with unrelated subsystems.
 *
 * Initialised through pthread_once rather than a static initialiser, so it gets the same
 * recursive attribute every other lock in the tree gets from
 * dt_pthread_mutex_init(..., NULL) -- a static PTHREAD_MUTEX_INITIALIZER cannot carry one.
 * See doc/lock-audit.md. */
static dt_pthread_mutex_t _rsvg_lock;
static pthread_once_t _rsvg_lock_once = PTHREAD_ONCE_INIT;
 
static void _rsvg_lock_init(void)
{
  dt_pthread_mutex_init(&_rsvg_lock, NULL);
}
 
DT_MODULE_INTROSPECTION(5, dt_iop_watermark_params_t)
 
// gchar *checksum = g_compute_checksum_for_data(G_CHECKSUM_MD5,data,length);
 
typedef enum dt_iop_watermark_base_scale_t
{
  DT_SCALE_IMAGE = 0,         // $DESCRIPTION: "image"
  DT_SCALE_LARGER_BORDER = 1, // $DESCRIPTION: "larger border"
  DT_SCALE_SMALLER_BORDER = 2 // $DESCRIPTION: "smaller border"
} dt_iop_watermark_base_scale_t;
 
typedef enum dt_iop_watermark_type_t
{
  DT_WTM_SVG = 0,         // $DESCRIPTION: "vector .svg"
  DT_WTM_PNG = 1          // $DESCRIPTION: "raster .png"
} dt_iop_watermark_type_t;
 
typedef struct dt_iop_watermark_params_t
{
  float opacity; // $MIN: 0.0 $MAX: 100.0 $DEFAULT: 100.0
  float scale;   // $MIN: 1.0 $MAX: 500.0 $DEFAULT: 100.0
  float xoffset; // $MIN: -1.0 $MAX: 1.0, 0.001 $DEFAULT: 0.0 $DESCRIPTION: "x offset"
  float yoffset; // $MIN: -1.0 $MAX: 1.0, 0.001 $DEFAULT: 0.0 $DESCRIPTION: "y offset"
  int alignment; // $DEFAULT: 4
  float rotate;  // $MIN: -180.0 $MAX: 180.0 $DEFAULT: 0.0 $DESCRIPTION: "rotation"
  dt_iop_watermark_base_scale_t sizeto; // $DEFAULT: DT_SCALE_IMAGE $DESCRIPTION: "scale on"
  char filename[64];
  /* simple text */
  char text[512];
  /* text color */
  float color[3]; // $DEFAULT: 0.0
  /* text font */
  char font[64];
} dt_iop_watermark_params_t;
 
typedef struct dt_iop_watermark_data_t
{
  float opacity;
  float scale;
  float xoffset;
  float yoffset;
  int alignment;
  float rotate;
  dt_iop_watermark_base_scale_t sizeto;
  char filename[64];
  char text[512];
  float color[3];
  char font[64];
} dt_iop_watermark_data_t;
 
typedef struct dt_iop_watermark_gui_data_t
{
  GtkWidget *watermarks;                             // watermark
  GList     *watermarks_filenames;                   // the actual filenames
  GtkWidget *refresh;                                // refresh watermarks...
  GtkWidget *align[9];                               // Alignment buttons
  GtkWidget *opacity, *scale, *x_offset, *y_offset;  // opacity, scale, xoffs, yoffs
  GtkWidget *sizeto;                                 // relative size to
  GtkWidget *rotate;
  GtkWidget *text;
  GtkWidget *colorpick;
  GtkWidget *fontsel;
  GtkWidget *color_picker_button;
} dt_iop_watermark_gui_data_t;
 
int legacy_params(dt_iop_module_t *self, const void *const old_params, const int old_version,
                  void *new_params, const int new_version)
{
  if(old_version == 1 && new_version == 5)
  {
    typedef struct dt_iop_watermark_params_v1_t
    {
      float opacity;
      float scale;
      float xoffset;
      float yoffset;
      int alignment;
      char filename[64];
    } dt_iop_watermark_params_v1_t;
 
    dt_iop_watermark_params_v1_t *o = (dt_iop_watermark_params_v1_t *)old_params;
    dt_iop_watermark_params_t *n = (dt_iop_watermark_params_t *)new_params;
    dt_iop_watermark_params_t *d = (dt_iop_watermark_params_t *)self->default_params;
 
    *n = *d; // start with a fresh copy of default parameters
 
    n->opacity = o->opacity;
    n->scale = o->scale;
    n->xoffset = o->xoffset;
    n->yoffset = o->yoffset;
    n->alignment = o->alignment;
    n->rotate = 0.0;
    n->sizeto = DT_SCALE_IMAGE;
    g_strlcpy(n->filename, o->filename, sizeof(n->filename));
    g_strlcpy(n->text, "", sizeof(n->text));
    g_strlcpy(n->font, "DejaVu Sans 10", sizeof(n->font));
    n->color[0] = n->color[1] = n->color[2] = 0;
    return 0;
  }
  else if(old_version == 2 && new_version == 5)
  {
    typedef struct dt_iop_watermark_params_v2_t
    {
      float opacity;
      float scale;
      float xoffset;
      float yoffset;
      int alignment;
      dt_iop_watermark_base_scale_t sizeto;
      char filename[64];
    } dt_iop_watermark_params_v2_t;
 
    dt_iop_watermark_params_v2_t *o = (dt_iop_watermark_params_v2_t *)old_params;
    dt_iop_watermark_params_t *n = (dt_iop_watermark_params_t *)new_params;
    dt_iop_watermark_params_t *d = (dt_iop_watermark_params_t *)self->default_params;
 
    *n = *d; // start with a fresh copy of default parameters
 
    n->opacity = o->opacity;
    n->scale = o->scale;
    n->xoffset = o->xoffset;
    n->yoffset = o->yoffset;
    n->alignment = o->alignment;
    n->rotate = 0.0;
    n->sizeto = DT_SCALE_IMAGE;
    g_strlcpy(n->filename, o->filename, sizeof(n->filename));
    g_strlcpy(n->text, "", sizeof(n->text));
    g_strlcpy(n->font, "DejaVu Sans 10", sizeof(n->font));
    n->color[0] = n->color[1] = n->color[2] = 0;
    return 0;
  }
  else if(old_version == 3 && new_version == 5)
  {
    typedef struct dt_iop_watermark_params_v3_t
    {
      float opacity;
      float scale;
      float xoffset;
      float yoffset;
      int alignment;
      float rotate;
      dt_iop_watermark_base_scale_t sizeto;
      char filename[64];
    } dt_iop_watermark_params_v3_t;
 
    dt_iop_watermark_params_v3_t *o = (dt_iop_watermark_params_v3_t *)old_params;
    dt_iop_watermark_params_t *n = (dt_iop_watermark_params_t *)new_params;
    dt_iop_watermark_params_t *d = (dt_iop_watermark_params_t *)self->default_params;
 
    *n = *d; // start with a fresh copy of default parameters
 
    n->opacity = o->opacity;
    n->scale = o->scale;
    n->xoffset = o->xoffset;
    n->yoffset = o->yoffset;
    n->alignment = o->alignment;
    n->rotate = o->rotate;
    n->sizeto = o->sizeto;
    g_strlcpy(n->filename, o->filename, sizeof(n->filename));
    g_strlcpy(n->text, "", sizeof(n->text));
    g_strlcpy(n->font, "DejaVu Sans 10", sizeof(n->font));
    n->color[0] = n->color[1] = n->color[2] = 0;
    return 0;
  }
  else if(old_version == 4 && new_version == 5)
  {
    typedef struct dt_iop_watermark_params_v4_t
    {
      float opacity;
      float scale;
      float xoffset;
      float yoffset;
      int alignment;
      float rotate;
      dt_iop_watermark_base_scale_t sizeto;
      char filename[64];
      /* simple text */
      char text[64];
      /* text color */
      float color[3];
      /* text font */
      char font[64];
    } dt_iop_watermark_params_v4_t;
 
    dt_iop_watermark_params_v4_t *o = (dt_iop_watermark_params_v4_t *)old_params;
    dt_iop_watermark_params_t *n = (dt_iop_watermark_params_t *)new_params;
    dt_iop_watermark_params_t *d = (dt_iop_watermark_params_t *)self->default_params;
 
    *n = *d; // start with a fresh copy of default parameters
 
    n->opacity = o->opacity;
    n->scale = o->scale;
    n->xoffset = o->xoffset;
    n->yoffset = o->yoffset;
    n->alignment = o->alignment;
    n->rotate = o->rotate;
    n->sizeto = o->sizeto;
    g_strlcpy(n->filename, o->filename, sizeof(n->filename));
    g_strlcpy(n->text, o->text, sizeof(n->text));
    g_strlcpy(n->font, o->font, sizeof(n->font));
    n->color[0] = o->color[0];
    n->color[1] = o->color[1];
    n->color[2] = o->color[2];
    return 0;
  }
  return 1;
}
 
 
const char *name()
{
  return _("_Watermark");
}
 
const char **description(struct dt_iop_module_t *self)
{
  return dt_iop_set_description(self, _("overlay an SVG watermark like a signature on the picture"),
                                      _("creative"),
                                      _("non-linear, RGB, display-referred"),
                                      _("non-linear, RGB"),
                                      _("non-linear, RGB, display-referred"));
}
 
int flags()
{
  return IOP_FLAGS_INCLUDE_IN_STYLES | IOP_FLAGS_SUPPORTS_BLENDING;
}
 
int default_group()
{
  return IOP_GROUP_EFFECTS;
}
 
int operation_tags()
{
  return IOP_TAG_DECORATION;
}
 
int default_colorspace(dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, const dt_dev_pixelpipe_iop_t *piece)
{
  return IOP_CS_RGB;
}
 
void input_format(dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece,
                  dt_iop_buffer_dsc_t *dsc)
{
  default_input_format(self, pipe, piece, dsc);
  dsc->channels = 4;
  dsc->datatype = TYPE_FLOAT;
}
 
// sets text / color / font widgets sensitive based on watermark file type
static void _text_color_font_set_sensitive(dt_iop_watermark_gui_data_t *g, gchar *filename)
{
  const gchar *extension = strrchr(filename, '.');
  if(!IS_NULL_PTR(extension))
  {
    const gboolean active = !g_ascii_strcasecmp(extension, ".svg");
    gtk_widget_set_sensitive(GTK_WIDGET(g->colorpick), active);
    gtk_widget_set_sensitive(GTK_WIDGET(g->color_picker_button), active);
    gtk_widget_set_sensitive(GTK_WIDGET(g->text), active);
    gtk_widget_set_sensitive(GTK_WIDGET(g->fontsel), active);
  }
}
 
static void _combo_box_set_active_text(dt_iop_watermark_gui_data_t *g, gchar *text)
{
  int i = 0;
  for(const GList *iter = g->watermarks_filenames; iter; iter = g_list_next(iter))
  {
    if(!g_strcmp0((gchar *)iter->data, text))
    {
      dt_bauhaus_combobox_set(g->watermarks, i);
      _text_color_font_set_sensitive(g, text);
      return;
    }
    i++;
  }
}
 
// replace < and > with &lt; and &gt;. any more? Yes! & -> &amp;
static gchar *_string_escape(const gchar *string)
{
  gchar *result, *result_old;
  result = dt_util_str_replace(string, "&", "&amp;");
 
  result_old = result;
  result = dt_util_str_replace(result_old, "<", "&lt;");
  dt_free(result_old);
 
  result_old = result;
  result = dt_util_str_replace(result_old, ">", "&gt;");
  dt_free(result_old);
 
  return result;
}
 
static gchar *_string_substitute(gchar *string, const gchar *search, const gchar *replace)
{
  gchar *_replace = _string_escape(replace);
  gchar *result = dt_util_str_replace(string, search, _replace);
  dt_free(_replace);
  dt_free(string);  // dt_util_str_replace always returns a new string, and we don't need the original after this func
  return result;
}
 
static gchar *_watermark_get_svgdoc(dt_iop_module_t *self, dt_iop_watermark_data_t *data,
                                    const dt_image_t *image, const gchar *filename)
{
  gchar *svgdata = NULL;
  gsize length = 0;
  if(g_file_get_contents(filename, &svgdata, &length, NULL))
  {
    // File is loaded lets substitute strings if found...
    // Simple text from watermark module
    gchar buffer[1024];
 
    // substitute $(WATERMARK_TEXT)
    if(data->text[0])
    {
      g_strlcpy(buffer, data->text, sizeof(buffer));
      svgdata = _string_substitute(svgdata, "$(WATERMARK_TEXT)", buffer);
    }
    // apply font style substitutions
    PangoFontDescription *font = pango_font_description_from_string(data->font);
    const PangoStyle font_style = pango_font_description_get_style(font);
    const int font_weight = (int)pango_font_description_get_weight(font);
 
    g_strlcpy(buffer, pango_font_description_get_family(font), sizeof(buffer));
    svgdata = _string_substitute(svgdata, "$(WATERMARK_FONT_FAMILY)", buffer);
 
    switch(font_style)
    {
      case PANGO_STYLE_OBLIQUE:
        g_strlcpy(buffer, "oblique", sizeof(buffer));
        break;
      case PANGO_STYLE_ITALIC:
        g_strlcpy(buffer, "italic", sizeof(buffer));
        break;
      default:
        g_strlcpy(buffer, "normal", sizeof(buffer));
        break;
    }
    svgdata = _string_substitute(svgdata, "$(WATERMARK_FONT_STYLE)", buffer);
 
    g_snprintf(buffer, sizeof(buffer), "%d", font_weight);
    svgdata = _string_substitute(svgdata, "$(WATERMARK_FONT_WEIGHT)", buffer);
 
    pango_font_description_free(font);
 
    // watermark color
    GdkRGBA c = { data->color[0], data->color[1], data->color[2], 1.0f };
    g_strlcpy(buffer, gdk_rgba_to_string(&c), sizeof(buffer));
    svgdata = _string_substitute(svgdata, "$(WATERMARK_COLOR)", buffer);
 
    // standard calculation on the remaining variables
    const int32_t flags = dt_lib_export_metadata_get_conf_flags();
    dt_variables_params_t *params;
    dt_variables_params_init(&params);
    gboolean from_cache = FALSE;
    char image_path[DT_PATH_MAX] = { 0 };
    dt_image_full_path(image->id,  image_path,  sizeof(image_path),  &from_cache, __FUNCTION__);
    params->filename = image_path;
    params->jobcode = "infos";
    params->sequence = 0;
    params->imgid = image->id;
    dt_variables_set_tags_flags(params, flags);
    gchar *svgdoc = dt_variables_expand(params, svgdata, FALSE);  // returns a new string
    dt_variables_params_destroy(params);
    dt_free(svgdata);  // free the old one
    svgdata = svgdoc; // and make the expanded string our result
  }
  return svgdata;
}
 
__DT_CLONE_TARGETS__
int process(struct 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)
{
  const dt_iop_roi_t *const roi_in = &piece->roi_in;
  const dt_iop_roi_t *const roi_out = &piece->roi_out;
  dt_iop_watermark_data_t *data = (dt_iop_watermark_data_t *)piece->data;
  float *in = (float *)ivoid;
  float *out = (float *)ovoid;
  const int ch = 4;
  const float angle = (M_PI / 180) * (-data->rotate);
 
  gchar configdir[DT_PATH_MAX] = { 0 };
  gchar datadir[DT_PATH_MAX] = { 0 };
  gchar *filename;
  dt_loc_get_datadir(datadir, sizeof(datadir));
  dt_loc_get_user_config_dir(configdir, sizeof(configdir));
  g_strlcat(datadir, "/watermarks/", sizeof(datadir));
  g_strlcat(configdir, "/watermarks/", sizeof(configdir));
  g_strlcat(datadir, data->filename, sizeof(datadir));
  g_strlcat(configdir, data->filename, sizeof(configdir));
 
  if(g_file_test(configdir, G_FILE_TEST_EXISTS))
    filename = configdir;
  else if(g_file_test(datadir, G_FILE_TEST_EXISTS))
    filename = datadir;
  else
  {
    dt_iop_image_copy_by_size(ovoid, ivoid, roi_out->width, roi_out->height, ch);
    return 0;
  }
 
  // find out the watermark type
  dt_iop_watermark_type_t type;
  const gchar *extension = strrchr(data->filename, '.');
  if(!IS_NULL_PTR(extension))
  {
    if(!g_ascii_strcasecmp(extension, ".svg"))
      type = DT_WTM_SVG;
    else if(!g_ascii_strcasecmp(extension, ".png"))
      type = DT_WTM_PNG;
    else // this should not happen
    {
      dt_iop_image_copy_by_size(ovoid, ivoid, roi_out->width, roi_out->height, ch);
      return 0;
    }
  }
  else
  {
    dt_iop_image_copy_by_size(ovoid, ivoid, roi_out->width, roi_out->height, ch);
    return 0;
  }
 
  /* Load svg if not loaded */
  gchar *svgdoc = NULL;
  if(type == DT_WTM_SVG)
  {
    svgdoc = _watermark_get_svgdoc(self, data, &pipe->dev->image_storage, filename);
    if(IS_NULL_PTR(svgdoc))
    {
      dt_iop_image_copy_by_size(ovoid, ivoid, roi_out->width, roi_out->height, ch);
      return 0;
    }
  }
 
  /* setup stride for performance */
  const int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, roi_out->width);
  if(stride == -1)
  {
    fprintf(stderr, "[watermark] cairo stride error\n");
    dt_iop_image_copy_by_size(ovoid, ivoid, roi_out->width, roi_out->height, ch);
    return 0;
  }
 
  /* create a cairo memory surface that is later used for reading watermark overlay data */
  guint8 *image = (guint8 *)g_try_malloc0_n(roi_out->height, stride);
  if(IS_NULL_PTR(image))
  {
    dt_iop_image_copy_by_size(ovoid, ivoid, roi_out->width, roi_out->height, ch);
    return 1;
  }
  cairo_surface_t *surface = cairo_image_surface_create_for_data(image, CAIRO_FORMAT_ARGB32, roi_out->width,
                                                                 roi_out->height, stride);
  if(cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS)
  {
    fprintf(stderr, "[watermark] cairo surface error: %s\n",
            cairo_status_to_string(cairo_surface_status(surface)));
    dt_free(image);
    dt_iop_image_copy_by_size(ovoid, ivoid, roi_out->width, roi_out->height, ch);
    return 0;
  }
 
  // rsvg (or some part of cairo which is used underneath) isn't thread safe, for example when
  // handling fonts. This lock belongs to this module: it is the only place in the pixel path
  // that drives rsvg, and it used to share the process-wide "plugin" mutex with rawspeed's
  // metadata init and the export filename allocator -- so a watermark render blocked an
  // unrelated export from picking a filename. See doc/lock-audit.md.
  pthread_once(&_rsvg_lock_once, _rsvg_lock_init);
  dt_pthread_mutex_lock(&_rsvg_lock);
 
  RsvgHandle *svg = NULL;
  if(type == DT_WTM_SVG)
  {
    /* create the rsvghandle from parsed svg data */
    GError *error = NULL;
    svg = rsvg_handle_new_from_data((const guint8 *)svgdoc, strlen(svgdoc), &error);
    dt_free(svgdoc);
    if(IS_NULL_PTR(svg) || error)
    {
      cairo_surface_destroy(surface);
      dt_free(image);
      dt_iop_image_copy_by_size(ovoid, ivoid, roi_out->width, roi_out->height, ch);
      dt_pthread_mutex_unlock(&_rsvg_lock);
      fprintf(stderr, "[watermark] error processing svg file: %s\n", error->message);
      g_error_free(error);
      return 0;
    }
  }
 
  // we use a second surface
  guint8 *image_two = NULL;
  cairo_surface_t *surface_two = NULL;
 
  /* get the dimension of svg or png */
  RsvgDimensionData dimension;
  switch(type)
  {
    case DT_WTM_SVG:
      dimension = dt_get_svg_dimension(svg);
      break;
    case DT_WTM_PNG:
      // load png into surface 2
      surface_two = cairo_image_surface_create_from_png(filename);
      if((cairo_surface_status(surface_two) != CAIRO_STATUS_SUCCESS))
      {
        fprintf(stderr, "[watermark] cairo png surface 2 error: %s\n",
                cairo_status_to_string(cairo_surface_status(surface_two)));
        cairo_surface_destroy(surface);
        dt_free(image);
        dt_iop_image_copy_by_size(ovoid, ivoid, roi_out->width, roi_out->height, ch);
        dt_pthread_mutex_unlock(&_rsvg_lock);
        return 0;
      }
      dimension.width = cairo_image_surface_get_width(surface_two);
      dimension.height = cairo_image_surface_get_height(surface_two);
      break;
  }
 
  // if no text is given dimensions are null
  if(!dimension.width) dimension.width = 1;
  if(!dimension.height) dimension.height = 1;
 
  //  width/height of current (possibly cropped) image
  const float iw = piece->buf_in.width;
  const float ih = piece->buf_in.height;
  const float uscale = data->scale / 100.0f; // user scale, from GUI in percent
 
  // wbase, hbase are the base width and height, this is the multiplicator used for the offset computing
  // scale is the scale of the watermark itself and is used only to render it.
 
  float wbase, hbase, scale;
 
  if(data->sizeto == DT_SCALE_IMAGE)
  {
    // in image mode, the wbase and hbase are just the image width and height
    wbase = iw;
    hbase = ih;
    if(dimension.width > dimension.height)
      scale = (iw * roi_out->scale) / dimension.width;
    else
      scale = (ih * roi_out->scale) / dimension.height;
  }
  else
  {
    // in larger/smaller side mode, set wbase and hbase to the largest or smallest side of the image
    const float larger = dimension.width > dimension.height
      ? (float)dimension.width
      : (float)dimension.height;
 
    if(iw > ih)
    {
      wbase = hbase = (data->sizeto == DT_SCALE_LARGER_BORDER) ? iw : ih;
      scale = (data->sizeto == DT_SCALE_LARGER_BORDER) ? (iw / larger) : (ih / larger);
    }
    else
    {
      wbase = hbase = (data->sizeto == DT_SCALE_SMALLER_BORDER) ? iw : ih;
      scale = (data->sizeto == DT_SCALE_SMALLER_BORDER) ? (iw / larger) : (ih / larger);
    }
    scale *= roi_out->scale;
  }
 
  scale *= uscale;
 
  // compute the width and height of the SVG object in image dimension. This is only used to properly
  // layout the watermark based on the alignment.
 
  float svg_width, svg_height;
 
  if(dimension.width > dimension.height)
  {
    if(data->sizeto == DT_SCALE_IMAGE || (iw > ih && data->sizeto == DT_SCALE_LARGER_BORDER)
       || (iw < ih && data->sizeto == DT_SCALE_SMALLER_BORDER))
    {
      svg_width = iw * uscale;
      svg_height = dimension.height * (svg_width / dimension.width);
    }
    else
    {
      svg_width = ih * uscale;
      svg_height = dimension.height * (svg_width / dimension.width);
    }
  }
  else
  {
    if(data->sizeto == DT_SCALE_IMAGE || (ih > iw && data->sizeto == DT_SCALE_LARGER_BORDER)
       || (ih < iw && data->sizeto == DT_SCALE_SMALLER_BORDER))
    {
      svg_height = ih * uscale;
      svg_width = dimension.width * (svg_height / dimension.height);
    }
    else
    {
      svg_height = iw * uscale;
      svg_width = dimension.width * (svg_height / dimension.height);
    }
  }
 
  /* For the rotation we need an extra cairo image as rotations are buggy  via rsvg_handle_render_cairo.
     distortions and blurred images are obvious but you also can easily have crashes.
  */
 
  float svg_offset_x = 0;
  float svg_offset_y = 0;
  if(type == DT_WTM_SVG)
  {
    /* the svg_offsets allow safe text boxes as they might render out of the dimensions */
    svg_offset_x = ceilf(3.0f * scale);
    svg_offset_y = ceilf(3.0f * scale);
 
    const int watermark_width  = (int)((dimension.width  * scale) + 3* svg_offset_x);
    const int watermark_height = (int)((dimension.height * scale) + 3* svg_offset_y) ;
 
    const int stride_two = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, watermark_width);
    image_two = (guint8 *)g_try_malloc0_n(watermark_height, stride_two);
    if(IS_NULL_PTR(image_two))
    {
      cairo_surface_destroy(surface);
      g_object_unref(svg);
      dt_free(image);
      dt_iop_image_copy_by_size(ovoid, ivoid, roi_out->width, roi_out->height, ch);
      dt_pthread_mutex_unlock(&_rsvg_lock);
      return 1;
    }
    surface_two = cairo_image_surface_create_for_data(image_two, CAIRO_FORMAT_ARGB32, watermark_width,
                                                                   watermark_height, stride_two);
    if(cairo_surface_status(surface_two) != CAIRO_STATUS_SUCCESS)
    {
      fprintf(stderr, "[watermark] cairo surface 2 error: %s\n",
              cairo_status_to_string(cairo_surface_status(surface_two)));
      cairo_surface_destroy(surface);
      g_object_unref(svg);
      dt_free(image);
      dt_free(image_two);
      dt_iop_image_copy_by_size(ovoid, ivoid, roi_out->width, roi_out->height, ch);
      dt_pthread_mutex_unlock(&_rsvg_lock);
      return 0;
    }
  }
 
  /* create cairo context and setup transformation/scale */
  cairo_t *cr = cairo_create(surface);
  /* create cairo context for the scaled watermark */
  cairo_t *cr_two = cairo_create(surface_two);
 
  // compute bounding box of rotated watermark
  const float bb_width = fabsf(svg_width * cosf(angle)) + fabsf(svg_height * sinf(angle));
  const float bb_height = fabsf(svg_width * sinf(angle)) + fabsf(svg_height * cosf(angle));
  const float bX = bb_width / 2.0f - svg_width / 2.0f;
  const float bY = bb_height / 2.0f - svg_height / 2.0f;
 
  // compute translation for the given alignment in image dimension
 
  float ty = 0, tx = 0;
  if(data->alignment >= 0 && data->alignment < 3) // Align to verttop
    ty = bY;
  else if(data->alignment >= 3 && data->alignment < 6) // Align to vertcenter
    ty = (ih / 2.0f) - (svg_height / 2.0f);
  else if(data->alignment >= 6 && data->alignment < 9) // Align to vertbottom
    ty = ih - svg_height - bY;
 
  if(data->alignment == 0 || data->alignment == 3 || data->alignment == 6)
    tx = bX;
  else if(data->alignment == 1 || data->alignment == 4 || data->alignment == 7)
    tx = (iw / 2.0f) - (svg_width / 2.0f);
  else if(data->alignment == 2 || data->alignment == 5 || data->alignment == 8)
    tx = iw - svg_width - bX;
 
  // translate to position
  cairo_translate(cr, -roi_in->x, -roi_in->y);
 
  // add translation for the given value in GUI (xoffset,yoffset)
  tx += data->xoffset * wbase;
  ty += data->yoffset * hbase;
 
  cairo_translate(cr, tx * roi_out->scale, ty * roi_out->scale);
 
  // compute the center of the svg to rotate from the center
  const float cX = svg_width / 2.0f * roi_out->scale;
  const float cY = svg_height / 2.0f * roi_out->scale;
 
  cairo_translate(cr, cX, cY);
  cairo_rotate(cr, angle);
  cairo_translate(cr, -cX, -cY);
 
  // now set proper scale and translationfor the watermark itself
  cairo_translate(cr_two, svg_offset_x, svg_offset_y);
 
  switch(type)
  {
    case DT_WTM_SVG:
      cairo_scale(cr_two, scale, scale);
      /* render svg into surface*/
      dt_render_svg(svg, cr_two, dimension.width, dimension.height, 0, 0);
      break;
    case DT_WTM_PNG:
      cairo_scale(cr, scale, scale);
      break;
  }
  cairo_surface_flush(surface_two);
 
  // paint the watermark
  cairo_set_source_surface(cr, surface_two, -svg_offset_x, -svg_offset_y);
  cairo_paint(cr);
 
  // no more non-thread safe rsvg usage
  dt_pthread_mutex_unlock(&_rsvg_lock);
 
  cairo_destroy(cr);
  cairo_destroy(cr_two);
 
  /* ensure that all operations on surface finishing up */
  cairo_surface_flush(surface);
 
  /* render surface on output */
  guint8 *sd = image;
  const float opacity = data->opacity / 100.0f;
  __OMP_PARALLEL_FOR__()
  for(int j = 0; j < roi_out->height * roi_out->width; j++)
  {
    float *const i = in + ch*j;
    float *const o = out + ch*j;
    guint8 *const s = sd + 4*j;
    const float alpha = (s[3] / 255.0f) * opacity;
    /* svg uses a premultiplied alpha, so only use opacity for the blending */
    o[0] = ((1.0f - alpha) * i[0]) + (opacity * (s[2] / 255.0f));
    o[1] = ((1.0f - alpha) * i[1]) + (opacity * (s[1] / 255.0f));
    o[2] = ((1.0f - alpha) * i[2]) + (opacity * (s[0] / 255.0f));
    o[3] = in[3];
    }
 
  /* clean up */
  cairo_surface_destroy(surface);
  cairo_surface_destroy(surface_two);
  dt_free(image);
  if(type == DT_WTM_SVG)
  {
    dt_free(image_two);
    g_object_unref(svg);
  }
 
  return 0;
}
 
static void watermark_callback(GtkWidget *tb, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  dt_iop_watermark_gui_data_t *g = (dt_iop_watermark_gui_data_t *)dt_iop_gui_data(self);
 
  if(dt_gui_widgets_suppressed()) return;
  dt_iop_watermark_params_t *p = (dt_iop_watermark_params_t *)self->params;
  memset(p->filename, 0, sizeof(p->filename));
  int n = dt_bauhaus_combobox_get(g->watermarks);
  g_strlcpy(p->filename, (char *)g_list_nth_data(g->watermarks_filenames, n), sizeof(p->filename));
  _text_color_font_set_sensitive(g, p->filename);
  dt_dev_add_history_item(self->dev, self, TRUE, TRUE);
}
 
void color_picker_apply(dt_iop_module_t *self, GtkWidget *picker, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
  dt_iop_watermark_gui_data_t *g = (dt_iop_watermark_gui_data_t *)dt_iop_gui_data(self);
  dt_iop_watermark_params_t *p = (dt_iop_watermark_params_t *)self->params;
 
  if(fabsf(p->color[0] - self->picked_color[0]) < 0.0001f
     && fabsf(p->color[1] - self->picked_color[1]) < 0.0001f
     && fabsf(p->color[2] - self->picked_color[2]) < 0.0001f)
  {
    // interrupt infinite loops
    return;
  }
 
  GdkRGBA c = {.red   = self->picked_color[0],
               .green = self->picked_color[1],
               .blue  = self->picked_color[2],
               .alpha = 1.0 };
 
  p->color[0] = self->picked_color[0];
  p->color[1] = self->picked_color[1];
  p->color[2] = self->picked_color[2];
  gtk_color_chooser_set_rgba(GTK_COLOR_CHOOSER(g->colorpick), &c);
 
  dt_dev_add_history_item(self->dev, self, TRUE, TRUE);
}
 
static void load_watermarks(const char *basedir, dt_iop_watermark_gui_data_t *g)
{
  GList *files = NULL;
  char *watermarks_dir = g_build_filename(basedir, "watermarks", NULL);
  GDir *dir = g_dir_open(watermarks_dir, 0, NULL);
  if(dir)
  {
    const gchar *d_name;
    while((d_name = g_dir_read_name(dir)))
      files = g_list_prepend(files, g_strdup(d_name));
    g_dir_close(dir);
  }
 
  files = g_list_sort(files, (GCompareFunc)g_strcmp0);
  for(GList *iter = files; iter; iter = g_list_next(iter))
  {
    char *filename = iter->data;
    gchar *extension = strrchr(filename, '.');
    if(extension)
    {
      // we add only supported file formats to the list
      if(!g_ascii_strcasecmp(extension, ".svg") || !g_ascii_strcasecmp(extension, ".png"))
      {
        // remember the whole filename for later
        g->watermarks_filenames = g_list_append(g->watermarks_filenames, g_strdup(filename));
        // ... and build string shown in the gui
        *extension = '\0';
        extension++;
        gchar *text = g_strdup_printf("%s (%s)", filename, extension);
        dt_bauhaus_combobox_add(g->watermarks, text);
        dt_free(text);
      }
    }
  }
 
  g_list_free_full(files, dt_free_gpointer);
  files = NULL;
  dt_free(watermarks_dir);
}
 
static void refresh_watermarks(dt_iop_module_t *self)
{
  dt_iop_watermark_gui_data_t *g = (dt_iop_watermark_gui_data_t *)dt_iop_gui_data(self);
  dt_iop_watermark_params_t *p = (dt_iop_watermark_params_t *)self->params;
 
  g_signal_handlers_block_by_func(g->watermarks, watermark_callback, self);
 
  // Clear combobox...
  dt_bauhaus_combobox_clear(g->watermarks);
  g_list_free_full(g->watermarks_filenames, dt_free_gpointer);
  g->watermarks_filenames = NULL;
 
  // check watermarkdir and update combo with entries...
  gchar configdir[DT_PATH_MAX] = { 0 };
  gchar datadir[DT_PATH_MAX] = { 0 };
  dt_loc_get_datadir(datadir, sizeof(datadir));
  dt_loc_get_user_config_dir(configdir, sizeof(configdir));
 
  load_watermarks(datadir, g);
  load_watermarks(configdir, g);
 
  _combo_box_set_active_text(g, p->filename);
 
  g_signal_handlers_unblock_by_func(g->watermarks, watermark_callback, self);
}
 
static void refresh_callback(GtkWidget *tb, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  refresh_watermarks(self);
}
 
static void alignment_callback(GtkWidget *tb, gpointer user_data)
{
  int index = -1;
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  dt_iop_watermark_gui_data_t *g = (dt_iop_watermark_gui_data_t *)dt_iop_gui_data(self);
 
  if(dt_gui_widgets_suppressed()) return;
  dt_iop_watermark_params_t *p = (dt_iop_watermark_params_t *)self->params;
 
 
  for(int i = 0; i < 9; i++)
  {
    /* block signal handler */
    g_signal_handlers_block_by_func(g->align[i], alignment_callback, user_data);
 
    if(GTK_WIDGET(g->align[i]) == tb)
    {
      gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->align[i]), TRUE);
      index = i;
    }
    else
      gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->align[i]), FALSE);
 
    /* unblock signal handler */
    g_signal_handlers_unblock_by_func(g->align[i], alignment_callback, user_data);
  }
  p->alignment = index;
  dt_dev_add_history_item(self->dev, self, TRUE, TRUE);
}
 
static void text_callback(GtkWidget *entry, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  if(dt_gui_widgets_suppressed()) return;
  dt_iop_watermark_params_t *p = (dt_iop_watermark_params_t *)self->params;
  g_strlcpy(p->text, gtk_entry_get_text(GTK_ENTRY(entry)), sizeof(p->text));
  dt_conf_set_string("plugins/darkroom/watermark/text", p->text);
  dt_dev_add_history_item(self->dev, self, TRUE, TRUE);
}
 
static void colorpick_color_set(GtkColorButton *widget, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  if(dt_gui_widgets_suppressed()) return;
  dt_iop_watermark_params_t *p = (dt_iop_watermark_params_t *)self->params;
 
  GdkRGBA c;
  gtk_color_chooser_get_rgba(GTK_COLOR_CHOOSER(widget), &c);
  p->color[0] = c.red;
  p->color[1] = c.green;
  p->color[2] = c.blue;
 
  dt_conf_set_float("plugins/darkroom/watermark/color_red", p->color[0]);
  dt_conf_set_float("plugins/darkroom/watermark/color_green", p->color[1]);
  dt_conf_set_float("plugins/darkroom/watermark/color_blue", p->color[2]);
  dt_dev_add_history_item(self->dev, self, TRUE, TRUE);
}
 
static void fontsel_callback(GtkWidget *button, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  if(dt_gui_widgets_suppressed()) return;
  dt_iop_watermark_params_t *p = (dt_iop_watermark_params_t *)self->params;
 
  gchar *fontname = gtk_font_chooser_get_font(GTK_FONT_CHOOSER(button));
  g_strlcpy(p->font, fontname, sizeof(p->font));
  dt_free(fontname);
  dt_conf_set_string("plugins/darkroom/watermark/font", p->font);
  dt_dev_add_history_item(self->dev, self, TRUE, TRUE);
}
 
void commit_params(struct dt_iop_module_t *self, dt_iop_params_t *p1, dt_dev_pixelpipe_t *pipe,
                   dt_dev_pixelpipe_iop_t *piece)
{
  dt_iop_watermark_params_t *p = (dt_iop_watermark_params_t *)p1;
  dt_iop_watermark_data_t *d = (dt_iop_watermark_data_t *)piece->data;
 
  d->opacity = p->opacity;
  d->scale = p->scale;
  d->rotate = p->rotate;
  d->xoffset = p->xoffset;
  d->yoffset = p->yoffset;
  d->alignment = p->alignment;
  d->sizeto = p->sizeto;
  memset(d->filename, 0, sizeof(d->filename));
  g_strlcpy(d->filename, p->filename, sizeof(d->filename));
  memset(d->text, 0, sizeof(d->text));
  g_strlcpy(d->text, p->text, sizeof(d->text));
  for (int k=0; k<3; k++)
    d->color[k] = p->color[k];
  memset(d->font, 0, sizeof(d->font));
  g_strlcpy(d->font, p->font, sizeof(d->font));
 
// fprintf(stderr, "Commit params: %s...\n",d->filename);
}
 
void init_pipe(struct dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
  piece->data = dt_calloc_align(sizeof(dt_iop_watermark_data_t));
  piece->data_size = sizeof(dt_iop_watermark_data_t);
}
 
void cleanup_pipe(struct 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 gui_update(struct dt_iop_module_t *self)
{
  dt_iop_watermark_gui_data_t *g = (dt_iop_watermark_gui_data_t *)dt_iop_gui_data(self);
  dt_iop_watermark_params_t *p = (dt_iop_watermark_params_t *)self->params;
  for(int i = 0; i < 9; i++)
  {
    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->align[i]), FALSE);
  }
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(g->align[p->alignment]), TRUE);
  _combo_box_set_active_text(g, p->filename);
  gtk_entry_set_text(GTK_ENTRY(g->text), p->text);
  GdkRGBA color = (GdkRGBA){.red = p->color[0], .green = p->color[1], .blue = p->color[2], .alpha = 1.0 };
  gtk_color_chooser_set_rgba(GTK_COLOR_CHOOSER(g->colorpick), &color);
  gtk_font_chooser_set_font(GTK_FONT_CHOOSER(g->fontsel), p->font);
}
 
void init(dt_iop_module_t *module)
{
  dt_iop_default_init(module);
}
 
void reload_defaults(dt_iop_module_t *module)
{
  dt_iop_watermark_params_t *d = module->default_params;
  g_strlcpy(d->filename, "simple-text.svg", sizeof(d->filename));
  g_strlcpy(d->font, "DejaVu Sans 10", sizeof(d->font));
}
 
void gui_init(struct dt_iop_module_t *self)
{
  dt_iop_watermark_gui_data_t *g = IOP_GUI_ALLOC(watermark);
  dt_iop_watermark_params_t *p = (dt_iop_watermark_params_t *)self->params;
 
  self->gui->widget = gtk_box_new(GTK_ORIENTATION_VERTICAL, DT_GUI_BOX_SPACING);
 
  GtkGrid *grid = GTK_GRID(gtk_grid_new());
  gtk_grid_set_row_spacing(grid, DT_GUI_BOX_SPACING);
  gtk_grid_set_column_spacing(grid, DT_GUI_BOX_SPACING);
  int line = 0;
 
  // Add the marker combobox
  gchar configdir[DT_PATH_MAX] = { 0 };
  gchar datadir[DT_PATH_MAX] = { 0 };
  dt_loc_get_datadir(datadir, sizeof(datadir));
  dt_loc_get_user_config_dir(configdir, sizeof(configdir));
 
  GtkWidget *label = dt_iop_gui_reset_label_new(_("marker"), self, &p->filename, sizeof(p->filename));
  g->watermarks = dt_bauhaus_combobox_new(dt_bauhaus_get_global(), DT_GUI_MODULE(self));
  gtk_widget_set_hexpand(GTK_WIDGET(g->watermarks), TRUE);
  char *tooltip = g_strdup_printf(_("SVG watermarks in %s/watermarks or %s/watermarks"), configdir, datadir);
  gtk_widget_set_tooltip_text(g->watermarks, tooltip);
  dt_free(tooltip);
  g->refresh = dtgtk_button_new(dtgtk_cairo_paint_refresh, 0, NULL);
 
  gtk_grid_attach(grid, label, 0, line++, 1, 1);
  gtk_grid_attach_next_to(grid, g->watermarks, label, GTK_POS_RIGHT, 1, 1);
  gtk_grid_attach_next_to(grid, g->refresh, g->watermarks, GTK_POS_RIGHT, 1, 1);
 
  // Simple text
  label = dt_ui_label_new(_("text"));
  g->text = gtk_entry_new();
  dt_accels_disconnect_on_text_input(g->text);
  gtk_entry_set_width_chars(GTK_ENTRY(g->text), 1);
  gtk_widget_set_tooltip_text(g->text, _("text string, tag:\n$(WATERMARK_TEXT)"));
  const char *str = dt_conf_get_string_const("plugins/darkroom/watermark/text");
  gtk_entry_set_text(GTK_ENTRY(g->text), str);
 
  gtk_grid_attach(grid, label, 0, line++, 1, 1);
  gtk_grid_attach_next_to(grid, g->text, label, GTK_POS_RIGHT, 2, 1);
 
  // Text font
  label = dt_iop_gui_reset_label_new(_("font"), self, &p->font, sizeof(p->font));
  str = dt_conf_get_string_const("plugins/darkroom/watermark/font");
  g->fontsel = gtk_font_button_new_with_font(str==NULL?"DejaVu Sans 10":str);
  GtkWidget *child = dt_gui_container_first_child(GTK_CONTAINER(gtk_bin_get_child(GTK_BIN(g->fontsel))));
  gtk_label_set_ellipsize(GTK_LABEL(child), PANGO_ELLIPSIZE_MIDDLE);
  gtk_widget_set_tooltip_text(g->fontsel, _("text font, tags:\n$(WATERMARK_FONT_FAMILY)\n"
                                            "$(WATERMARK_FONT_STYLE)\n$(WATERMARK_FONT_WEIGHT)"));
  gtk_font_button_set_show_size (GTK_FONT_BUTTON(g->fontsel), FALSE);
 
  gtk_grid_attach(grid, label, 0, line++, 1, 1);
  gtk_grid_attach_next_to(grid, g->fontsel, label, GTK_POS_RIGHT, 2, 1);
 
  // Watermark color
  float red = dt_conf_get_float("plugins/darkroom/watermark/color_red");
  float green = dt_conf_get_float("plugins/darkroom/watermark/color_green");
  float blue = dt_conf_get_float("plugins/darkroom/watermark/color_blue");
  GdkRGBA color = (GdkRGBA){.red = red, .green = green, .blue = blue, .alpha = 1.0 };
 
  label = dt_iop_gui_reset_label_new(_("color"), self, &p->color, 3 * sizeof(float));
  g->colorpick = gtk_color_button_new_with_rgba(&color);
  gtk_widget_set_tooltip_text(g->colorpick, _("watermark color, tag:\n$(WATERMARK_COLOR)"));
  gtk_color_chooser_set_use_alpha(GTK_COLOR_CHOOSER(g->colorpick), FALSE);
  gtk_color_button_set_title(GTK_COLOR_BUTTON(g->colorpick), _("select watermark color"));
  g->color_picker_button = dt_color_picker_new(self, DT_COLOR_PICKER_POINT, NULL);
  gtk_widget_set_tooltip_text(GTK_WIDGET(g->color_picker_button), _("pick color from image"));
 
  gtk_grid_attach(grid, label, 0, line++, 1, 1);
  gtk_grid_attach_next_to(grid, g->colorpick, label, GTK_POS_RIGHT, 1, 1);
  gtk_grid_attach_next_to(grid, g->color_picker_button, g->colorpick, GTK_POS_RIGHT, 1, 1);
 
  gtk_box_pack_start(GTK_BOX(self->gui->widget), GTK_WIDGET(grid), TRUE, TRUE, 0);
 
  // Add opacity/scale sliders to table
  g->opacity = dt_bauhaus_slider_from_params(self, N_("opacity"));
  dt_bauhaus_slider_set_format(g->opacity, "%");
 
  gtk_box_pack_start(GTK_BOX(self->gui->widget), dt_ui_section_label_new(_("placement")), TRUE, TRUE, 0);
 
  // rotate
  g->rotate = dt_bauhaus_slider_from_params(self, "rotate");
  dt_bauhaus_slider_set_format(g->rotate, "\302\260");
 
  // scale
  g->scale = dt_bauhaus_slider_from_params(self, N_("scale"));
  dt_bauhaus_slider_set_soft_max(g->scale, 100.0);
  dt_bauhaus_slider_set_format(g->scale, "%");
 
  // scale-on
  g->sizeto = dt_bauhaus_combobox_from_params(self, "sizeto");
  gtk_widget_set_tooltip_text(g->sizeto, _("size is relative to"));
 
  // Create the 3x3 gtk table toggle button table...
  GtkWidget *bat = gtk_grid_new();
  label = dt_iop_gui_reset_label_new(_("alignment"), self, &p->alignment, sizeof(p->alignment));
  gtk_grid_attach(GTK_GRID(bat), label, 0, 0, 1, 3);
  gtk_widget_set_hexpand(label, TRUE);
  gtk_grid_set_row_spacing(GTK_GRID(bat), DT_GUI_BOX_SPACING);
  gtk_grid_set_column_spacing(GTK_GRID(bat), DT_GUI_BOX_SPACING);
  for(int i = 0; i < 9; i++)
  {
    g->align[i] = dtgtk_togglebutton_new(dtgtk_cairo_paint_alignment, (CPF_SPECIAL_FLAG << i), NULL);
    gtk_grid_attach(GTK_GRID(bat), GTK_WIDGET(g->align[i]), 1 + i%3, i/3, 1, 1);
    g_signal_connect(G_OBJECT(g->align[i]), "toggled", G_CALLBACK(alignment_callback), self);
  }
 
  gtk_box_pack_start(GTK_BOX(self->gui->widget), bat, FALSE, FALSE, 0);
 
  // x/y offset
  g->x_offset = dt_bauhaus_slider_from_params(self, "xoffset");
  dt_bauhaus_slider_set_digits(g->x_offset, 3);
  g->y_offset = dt_bauhaus_slider_from_params(self, "yoffset");
  dt_bauhaus_slider_set_digits(g->y_offset, 3);
 
  // Let's add some tooltips and hook up some signals...
  gtk_widget_set_tooltip_text(g->opacity, _("the opacity of the watermark"));
  gtk_widget_set_tooltip_text(g->scale, _("the scale of the watermark"));
  gtk_widget_set_tooltip_text(g->rotate, _("the rotation of the watermark"));
 
  refresh_watermarks(self);
 
  g_signal_connect(G_OBJECT(g->watermarks), "value-changed", G_CALLBACK(watermark_callback), self);
  g_signal_connect(G_OBJECT(g->refresh), "clicked", G_CALLBACK(refresh_callback), self);
  g_signal_connect(G_OBJECT(g->text), "changed", G_CALLBACK(text_callback), self);
  g_signal_connect(G_OBJECT(g->colorpick), "color-set", G_CALLBACK(colorpick_color_set), self);
  g_signal_connect(G_OBJECT(g->fontsel), "font-set", G_CALLBACK(fontsel_callback), self);
}
 
void gui_cleanup(struct dt_iop_module_t *self)
{
  dt_iop_watermark_gui_data_t *g = (dt_iop_watermark_gui_data_t *)dt_iop_gui_data(self);
  g_list_free_full(g->watermarks_filenames, dt_free_gpointer);
  g->watermarks_filenames = NULL;
 
  IOP_GUI_FREE;
}
 
// 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