/* GIMP - The GNU Image Manipulation Program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * Colorify. Changes the pixel's luminosity to a specified color
 * Copyright (C) 1997 Francisco Bustamante
 *
 * This program 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.
 *
 * This program 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 program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>

#include "libgimp/stdplugins-intl.h"


#define PLUG_IN_PROC    "plug-in-colorify"
#define PLUG_IN_BINARY  "colorify"
#define PLUG_IN_ROLE    "gimp-colorify"
#define PLUG_IN_VERSION "1.1"

#define COLOR_SIZE 30

static void      query (void);
static void      run   (const gchar      *name,
                        gint              nparams,
                        const GimpParam  *param,
                        gint             *nreturn_vals,
                        GimpParam       **return_vals);

static void      colorify                  (GimpDrawable *drawable,
                                            GimpPreview  *preview);
static gboolean  colorify_dialog           (GimpDrawable *drawable);
static void      predefined_color_callback (GtkWidget    *widget,
                                            gpointer      data);

typedef struct
{
  GimpRGB  color;
} ColorifyVals;

static ColorifyVals cvals =
{
  { 1.0, 1.0, 1.0, 1.0 }
};

static GimpRGB button_color[] =
{
  { 1.0, 0.0, 0.0, 1.0 },
  { 1.0, 1.0, 0.0, 1.0 },
  { 0.0, 1.0, 0.0, 1.0 },
  { 0.0, 1.0, 1.0, 1.0 },
  { 0.0, 0.0, 1.0, 1.0 },
  { 1.0, 0.0, 1.0, 1.0 },
  { 1.0, 1.0, 1.0, 1.0 },
};

const GimpPlugInInfo PLUG_IN_INFO =
{
  NULL,
  NULL,
  query,
  run,
};

static GtkWidget *custom_color_button = NULL;

static gint lum_red_lookup[256];
static gint lum_green_lookup[256];
static gint lum_blue_lookup[256];
static gint final_red_lookup[256];
static gint final_green_lookup[256];
static gint final_blue_lookup[256];


MAIN ()

static void
query (void)
{
  static const GimpParamDef args[] =
  {
    { GIMP_PDB_INT32,    "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
    { GIMP_PDB_IMAGE,    "image",    "Input image"    },
    { GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
    { GIMP_PDB_COLOR,    "color",    "Color to apply" }
  };

  gimp_install_procedure (PLUG_IN_PROC,
                          N_("Replace all colors with shades of a specified color"),
                          "Makes an average of the RGB channels and uses it "
                          "to set the color",
                          "Francisco Bustamante",
                          "Francisco Bustamante",
                          PLUG_IN_VERSION,
                          N_("Colorif_y..."),
                          "RGB*",
                          GIMP_PLUGIN,
                          G_N_ELEMENTS (args), 0,
                          args, NULL);
}

static void
run (const gchar      *name,
     gint              nparams,
     const GimpParam  *param,
     gint             *nreturn_vals,
     GimpParam       **return_vals)
{
  GimpPDBStatusType  status;
  static GimpParam   values[1];
  GimpDrawable      *drawable;
  GimpRunMode        run_mode;

  INIT_I18N ();

  status = GIMP_PDB_SUCCESS;
  run_mode = param[0].data.d_int32;

  values[0].type = GIMP_PDB_STATUS;
  values[0].data.d_status = status;

  *nreturn_vals = 1;
  *return_vals = values;

  drawable = gimp_drawable_get (param[2].data.d_drawable);

  switch (run_mode)
    {
    case GIMP_RUN_INTERACTIVE:
      gimp_get_data (PLUG_IN_PROC, &cvals);
      if (!colorify_dialog (drawable))
        return;
      break;

    case GIMP_RUN_NONINTERACTIVE:
      if (nparams != 4)
        status = GIMP_PDB_CALLING_ERROR;

      if (status == GIMP_PDB_SUCCESS)
        cvals.color = param[3].data.d_color;
      break;

    case GIMP_RUN_WITH_LAST_VALS:
      /*  Possibly retrieve data  */
      gimp_get_data (PLUG_IN_PROC, &cvals);
      break;

    default:
      break;
    }

  if (status == GIMP_PDB_SUCCESS)
    {
      gimp_progress_init (_("Colorifying"));

      colorify (drawable, NULL);

      if (run_mode == GIMP_RUN_INTERACTIVE)
        gimp_set_data (PLUG_IN_PROC, &cvals, sizeof (ColorifyVals));

      if (run_mode != GIMP_RUN_NONINTERACTIVE)
        gimp_displays_flush ();
    }

  gimp_drawable_detach (drawable);

  values[0].data.d_status = status;
}

static void
colorify_func (const guchar *src,
               guchar       *dest,
               gint          bpp,
               gpointer      data)
{
  gint lum;

  lum = lum_red_lookup[src[0]]   +
        lum_green_lookup[src[1]] +
        lum_blue_lookup[src[2]];

  dest[0] = final_red_lookup[lum];
  dest[1] = final_green_lookup[lum];
  dest[2] = final_blue_lookup[lum];

  if (bpp == 4)
    dest[3] = src[3];
}

static void
colorify (GimpDrawable *drawable,
          GimpPreview  *preview)
{
  gint  i;

  for (i = 0; i < 256; i ++)
    {
      lum_red_lookup[i]     = i * GIMP_RGB_LUMINANCE_RED;
      lum_green_lookup[i]   = i * GIMP_RGB_LUMINANCE_GREEN;
      lum_blue_lookup[i]    = i * GIMP_RGB_LUMINANCE_BLUE;
      final_red_lookup[i]   = i * cvals.color.r;
      final_green_lookup[i] = i * cvals.color.g;
      final_blue_lookup[i]  = i * cvals.color.b;
    }

  if (preview)
    {
      gint    width, height, bytes;
      guchar *src;

      src = gimp_zoom_preview_get_source (GIMP_ZOOM_PREVIEW (preview),
                                          &width, &height, &bytes);
      for (i = 0; i < width * height; i++)
        colorify_func (src + i * bytes, src + i * bytes, bytes, NULL);

      gimp_preview_draw_buffer (preview, src, width * bytes);
      g_free (src);
    }
  else
    {
      GimpPixelRgn  srcPR, destPR;
      gint          x1, y1, x2, y2;
      gpointer      pr;
      gint          total_area;
      gint          area_so_far;
      gint          count;

      gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);

      total_area  = (x2 - x1) * (y2 - y1);
      area_so_far = 0;

      if (total_area <= 0)
        return;

      /* Initialize the pixel regions. */
      gimp_pixel_rgn_init (&srcPR, drawable, x1, y1, (x2 - x1), (y2 - y1),
                           FALSE, FALSE);
      gimp_pixel_rgn_init (&destPR, drawable, x1, y1, (x2 - x1), (y2 - y1),
                           TRUE, TRUE);

      for (pr = gimp_pixel_rgns_register (2, &srcPR, &destPR), count = 0;
           pr != NULL;
           pr = gimp_pixel_rgns_process (pr), count++)
        {
          const guchar *src  = srcPR.data;
          guchar       *dest = destPR.data;
          gint          row;

          for (row = 0; row < srcPR.h; row++)
            {
              const guchar *s      = src;
              guchar       *d      = dest;
              gint          pixels = srcPR.w;

              while (pixels--)
                {
                  colorify_func (s, d, srcPR.bpp, NULL);

                  s += srcPR.bpp;
                  d += destPR.bpp;
                }

              src  += srcPR.rowstride;
              dest += destPR.rowstride;
            }

          area_so_far += srcPR.w * srcPR.h;

          if ((count % 16) == 0)
            gimp_progress_update ((gdouble) area_so_far / (gdouble) total_area);
        }

      /*  update the processed region  */
      gimp_drawable_flush (drawable);
      gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
      gimp_drawable_update (drawable->drawable_id, x1, y1, (x2 - x1), (y2 - y1));
    }
}

static gboolean
colorify_dialog (GimpDrawable *drawable)
{
  GtkWidget *dialog;
  GtkWidget *main_vbox;
  GtkWidget *preview;
  GtkWidget *label;
  GtkWidget *button;
  GtkWidget *table;
  GtkWidget *color_area;
  gint       i;
  gboolean   run;

  gimp_ui_init (PLUG_IN_BINARY, TRUE);

  dialog = gimp_dialog_new (_("Colorify"), PLUG_IN_ROLE,
                            NULL, 0,
                            gimp_standard_help_func, PLUG_IN_PROC,

                            _("_Cancel"), GTK_RESPONSE_CANCEL,
                            _("_OK"),     GTK_RESPONSE_OK,

                            NULL);

  gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
                                           GTK_RESPONSE_OK,
                                           GTK_RESPONSE_CANCEL,
                                           -1);

  gimp_window_set_transient (GTK_WINDOW (dialog));

  main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
  gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
  gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
                      main_vbox, TRUE, TRUE, 0);
  gtk_widget_show (main_vbox);

  preview = gimp_zoom_preview_new_from_drawable_id (drawable->drawable_id);
  gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
  gtk_widget_show (preview);
  g_signal_connect_swapped (preview, "invalidated",
                            G_CALLBACK (colorify),
                            drawable);

  table = gtk_table_new (2, 7, TRUE);
  gtk_table_set_row_spacings (GTK_TABLE (table), 6);
  gtk_table_set_col_spacings (GTK_TABLE (table), 6);
  gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
  gtk_widget_show (table);

  label = gtk_label_new (_("Custom color:"));
  gtk_table_attach (GTK_TABLE (table), label, 4, 6, 0, 1,
                    GTK_FILL, GTK_FILL, 0, 0);
  gtk_widget_show (label);

  custom_color_button = gimp_color_button_new (_("Colorify Custom Color"),
                                               COLOR_SIZE, COLOR_SIZE,
                                               &cvals.color,
                                               GIMP_COLOR_AREA_FLAT);
  g_signal_connect (custom_color_button, "color-changed",
                    G_CALLBACK (gimp_color_button_get_color),
                    &cvals.color);
  g_signal_connect_swapped (custom_color_button, "color-changed",
                            G_CALLBACK (gimp_preview_invalidate),
                            preview);

  gtk_table_attach (GTK_TABLE (table), custom_color_button, 6, 7, 0, 1,
                    GTK_FILL, GTK_FILL, 0, 0);
  gtk_widget_show (custom_color_button);

  for (i = 0; i < 7; i++)
    {
      button = gtk_button_new ();
      color_area = gimp_color_area_new (&button_color[i],
                                        GIMP_COLOR_AREA_FLAT,
                                        GDK_BUTTON2_MASK);
      gtk_widget_set_size_request (GTK_WIDGET (color_area),
                                   COLOR_SIZE, COLOR_SIZE);
      gtk_container_add (GTK_CONTAINER (button), color_area);
      g_signal_connect (button, "clicked",
                        G_CALLBACK (predefined_color_callback),
                        &button_color[i]);
      gtk_widget_show (color_area);

      gtk_table_attach (GTK_TABLE (table), button, i, i + 1, 1, 2,
                        GTK_FILL, GTK_FILL, 0, 0);
      gtk_widget_show (button);
    }

  gtk_widget_show (dialog);

  run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);

  gtk_widget_destroy (dialog);

  return run;
}

static void
predefined_color_callback (GtkWidget *widget,
                           gpointer   data)
{
  gimp_color_button_set_color (GIMP_COLOR_BUTTON (custom_color_button),
                               (GimpRGB *) data);
}