/* The GIMP -- an 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/* Changes: 

   1.1 
   -Corrected small bug when calling color selection dialog 
   -Added LUTs to speed things a little bit up 

   1.0 
   -First release */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <gtk/gtk.h>

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

#include "libgimp/stdplugins-intl.h"

#define PLUG_IN_NAME "plug_in_colorify"
#define PLUG_IN_VERSION "1.1"

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

static void colorify     (GDrawable *drawable);
static void colorify_row (guchar    *row,
			  gint       width,
			  gint       bpp);

static gint colorify_dialog           (guchar     red,
				       guchar     green,
				       guchar     blue);
static void colorify_ok_callback      (GtkWidget *widget,
				       gpointer   data);
static void custom_color_callback     (GtkWidget *widget,
				       gpointer   data);
static void predefined_color_callback (GtkWidget *widget,
				       gpointer   data);
static void color_changed             (GtkWidget *widget,
				       gpointer   data);
static void set_preview_color         (GtkWidget *preview,
				       guchar     red,
				       guchar     green,
				       guchar     blue);

typedef struct
{
  guchar color[3];
} ColorifyVals;

typedef struct
{
  gint run;
} ColorifyInterface;

typedef struct
{
  guchar red;
  guchar green;
  guchar blue;
  GtkWidget *preview;
  gint button_num;
} ButtonInformation;

static ColorifyInterface cint =
{
  FALSE
};

static ColorifyVals cvals =
{
  { 255, 255, 255 }
};

static ButtonInformation button_info[] =
{
  { 255,   0,   0, NULL, 0 },
  { 255, 255,   0, NULL, 0 },
  {   0, 255,   0, NULL, 0 },
  {   0, 255, 255, NULL, 0 },
  {   0,   0, 255, NULL, 0 },
  { 255,   0, 255, NULL, 0 },
  { 255, 255, 255, NULL, 0 },
};

GPlugInInfo PLUG_IN_INFO =
{
  NULL,
  NULL,
  query,
  run,
};

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

MAIN ()

static void
query (void)
{
  static GParamDef args[] =
  {
    { PARAM_INT32, "run_mode", "Interactive, non-interactive" },
    { PARAM_IMAGE, "image", "Input image" },
    { PARAM_DRAWABLE, "drawable", "Input drawable" },
    { PARAM_COLOR, "color", "Color to apply"},
  };

  static GParamDef *return_vals  = NULL;
  static int        nargs        = sizeof(args) / sizeof(args[0]);
  static int        nreturn_vals = 0;

  INIT_I18N();

  gimp_install_procedure ("plug_in_colorify",
			  _("Similar to the \"Color\" mode for layers."),
			  _("Makes an average of the RGB channels and uses it to set the color"),
			  "Francisco Bustamante",
			  "Francisco Bustamante",
			  "0.0.1",
			  N_("<Image>/Filters/Colors/Colorify..."), 
			  "RGB*",
			  PROC_PLUG_IN,
			  nargs, nreturn_vals,
			  args, return_vals);
}

gint sel_x1, sel_x2, sel_y1, sel_y2, sel_width, sel_height;
GtkWidget *preview;
GtkWidget *c_dialog;

static void
run (gchar   *name,
     gint     nparams,
     GParam  *param,
     gint    *nreturn_vals,
     GParam **return_vals)
{
  GRunModeType run_mode;
  GStatusType status;
  static GParam values[1];
  GDrawable *drawable;

  INIT_I18N_UI();

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

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

  *nreturn_vals = 1;
  *return_vals = values;

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

  gimp_drawable_mask_bounds (drawable->id, &sel_x1, &sel_y1, &sel_x2, &sel_y2);

  sel_width = sel_x2 - sel_x1;
  sel_height = sel_y2 - sel_y1;

  switch (run_mode)
    {
    case RUN_INTERACTIVE:
      gimp_get_data (PLUG_IN_NAME, &cvals);
      if (!colorify_dialog (cvals.color[0], cvals.color[1], cvals.color[2]))
	return;
      break;

    case RUN_NONINTERACTIVE:
      if (nparams != 4)
	status = STATUS_CALLING_ERROR;

      if (status == STATUS_SUCCESS)
	{
	  cvals.color[0] = param[3].data.d_color.red;
	  cvals.color[1] = param[3].data.d_color.green;
	  cvals.color[2] = param[3].data.d_color.blue;
	}
      break;

    case RUN_WITH_LAST_VALS:
      /*  Possibly retrieve data  */
      gimp_get_data (PLUG_IN_NAME, &cvals);
      break;

    default:
      break;
    }

  if (status == STATUS_SUCCESS)
    {
      gimp_progress_init (_("Colorifying..."));

      colorify (drawable);

      if (run_mode == RUN_INTERACTIVE)
	gimp_set_data (PLUG_IN_NAME, &cvals, sizeof (ColorifyVals));

      if (run_mode != RUN_NONINTERACTIVE)
	{
	  gimp_displays_flush ();
	}
    }

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

static void
colorify (GDrawable *drawable)
{
  GPixelRgn source_region, dest_region;
  guchar *row;
  gint bpp;
  gint y = 0;
  gint progress = 0;
  gint i = 0;

  for (i = 0; i < 256; i ++)
    {
      lum_red_lookup[i] = i * 0.30;
      lum_green_lookup[i] = i * 0.59;
      lum_blue_lookup[i] = i * 0.11;
      final_red_lookup[i] = i * cvals.color[0] / 255;
      final_green_lookup[i] = i * cvals.color[1] / 255;
      final_blue_lookup[i] = i * cvals.color[2] / 255;
    }

  bpp = gimp_drawable_bpp (drawable->id);
  row = g_new (guchar, sel_width * bpp);

  gimp_pixel_rgn_init (&source_region, drawable,
		       sel_x1, sel_y1, sel_width, sel_height, FALSE, FALSE);
  gimp_pixel_rgn_init (&dest_region, drawable,
		       sel_x1, sel_y1, sel_width, sel_height, TRUE, TRUE);

  for (y = sel_y1; y < sel_y2; y++)
    {
      gimp_pixel_rgn_get_row (&source_region, row, sel_x1, y, sel_width);

      colorify_row (row, sel_width, bpp);

      gimp_pixel_rgn_set_row (&dest_region, row, sel_x1, y, sel_width);
      gimp_progress_update ((double) ++progress / sel_height);	
    }

  g_free (row);

  gimp_drawable_flush (drawable);
  gimp_drawable_merge_shadow (drawable->id, TRUE); 
  gimp_drawable_update (drawable->id, sel_x1, sel_y1, sel_width, sel_height);
}

static void
colorify_row (guchar *row,
	      gint    width,
	      gint    bpp)
{
  gint cur_x;
  gint lum; /* luminosity */
  guchar *current = row;

  for (cur_x = 0; cur_x < width; cur_x++)
    {
      lum = (lum_red_lookup[current[0]] +
	     lum_green_lookup[current[1]] +
	     lum_blue_lookup[current[2]]);

      current[0] = final_red_lookup[lum];
      current[1] = final_green_lookup[lum];
      current[2] = final_blue_lookup[lum];
		
      current += bpp;
    }
}
		
static int
colorify_dialog (guchar red,
		 guchar green,
		 guchar blue)
{
  GtkWidget *dialog;
  GtkWidget *label;
  GtkWidget *button;
  GtkWidget *frame;
  GtkWidget *table;
  gchar **argv;
  gint    argc;
  gint    i;
  GSList *group = NULL;

  argc    = 1;
  argv    = g_new (gchar *, 1);
  argv[0] = g_strdup ("colorify");

  gtk_init (&argc, &argv);
  gtk_rc_parse (gimp_gtkrc());

  dialog = gimp_dialog_new (_("Colorify"), "colorify",
			    gimp_plugin_help_func, "filters/colorify.html",
			    GTK_WIN_POS_MOUSE,
			    FALSE, TRUE, FALSE,

			    _("OK"), colorify_ok_callback,
			    NULL, NULL, NULL, TRUE, FALSE,
			    _("Cancel"), gtk_widget_destroy,
			    NULL, 1, NULL, FALSE, TRUE,

			    NULL);

  gtk_signal_connect (GTK_OBJECT (dialog), "destroy",
		      GTK_SIGNAL_FUNC (gtk_main_quit),
		      NULL);

  frame = gtk_frame_new (_("Color"));
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
  gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog)->vbox), frame, TRUE, TRUE, 0);
  gtk_widget_show (frame);

  table = gtk_table_new (2, 7, TRUE);
  gtk_container_set_border_width (GTK_CONTAINER (table), 4);
  gtk_container_add (GTK_CONTAINER (frame), table);
  gtk_table_set_row_spacings (GTK_TABLE (table), 4);
  gtk_table_set_col_spacings (GTK_TABLE (table), 4);
  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);

  button = gtk_radio_button_new (group);
  gtk_toggle_button_set_mode (GTK_TOGGLE_BUTTON (button), FALSE);
  gtk_widget_set_usize (button, 35, 35);
  gtk_signal_connect (GTK_OBJECT (button), "button_press_event",
		      (GtkSignalFunc) custom_color_callback,
		      NULL);
  gtk_table_attach (GTK_TABLE (table), button, 6, 7, 0, 1,
		    GTK_FILL, GTK_FILL, 0, 0);
  gtk_widget_show (button);

  preview = gtk_preview_new (GTK_PREVIEW_COLOR);
  gtk_preview_size (GTK_PREVIEW (preview), 30, 30);
  set_preview_color (preview, cvals.color[0], cvals.color[1], cvals.color[2]);
  gtk_container_add (GTK_CONTAINER (button), preview);
  gtk_widget_show (preview);
	
  for (i = 0; i < 7; i++)
    {
      group = gtk_radio_button_group (GTK_RADIO_BUTTON (button));
      button = gtk_radio_button_new (group);
      gtk_toggle_button_set_mode (GTK_TOGGLE_BUTTON (button), FALSE);
      button_info[i].preview = gtk_preview_new (GTK_PREVIEW_COLOR);
      gtk_preview_size (GTK_PREVIEW (button_info[i].preview),
			30, 30);
      gtk_container_add (GTK_CONTAINER (button), button_info[i].preview);
      set_preview_color (button_info[i].preview,
			 button_info[i].red,
			 button_info[i].green,
			 button_info[i].blue);
      button_info[i].button_num = i;
      gtk_signal_connect (GTK_OBJECT (button), "clicked",
			  (GtkSignalFunc) predefined_color_callback,
			  &button_info[i].button_num);
      gtk_widget_show (button_info[i].preview);

      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);

  gtk_main ();
  gdk_flush ();

  return cint.run;
}

static void
colorify_ok_callback (GtkWidget *widget,
		      gpointer   data)
{
  cint.run = TRUE;

  gtk_widget_destroy (GTK_WIDGET (data));
}

static void
set_preview_color (GtkWidget *preview,
		   guchar     red,
		   guchar     green,
		   guchar     blue)
{
  gint i;
  guchar buf[3 * 30];

  for (i = 0; i < 30; i ++)
    {
      buf [3 * i] = red;
      buf [3 * i + 1] = green;
      buf [3 * i + 2] = blue;
    }

  for (i = 0; i < 30; i ++) 
    gtk_preview_draw_row (GTK_PREVIEW (preview), buf, 0, i, 30);

  gtk_widget_draw (preview, NULL);
}

static void
custom_color_callback (GtkWidget *widget,
		       gpointer   data)
{
  GtkColorSelectionDialog *csd;
  gdouble colour[3];

  c_dialog = gtk_color_selection_dialog_new (_("Colorify Custom Color"));
  csd = GTK_COLOR_SELECTION_DIALOG (c_dialog);
  gtk_color_selection_set_update_policy (GTK_COLOR_SELECTION(csd->colorsel), 
					 GTK_UPDATE_DISCONTINUOUS); 

  gtk_widget_destroy (csd->help_button);
  gtk_widget_destroy (csd->cancel_button);

  gtk_signal_connect (GTK_OBJECT (csd->ok_button), "clicked",
		      (GtkSignalFunc) color_changed,
		      NULL);

  colour[0] = cvals.color[0] / 255.0;
  colour[1] = cvals.color[1] / 255.0;
  colour[2] = cvals.color[2] / 255.0;

  gtk_color_selection_set_color (GTK_COLOR_SELECTION (csd->colorsel),
				 colour);
  gtk_window_set_position (GTK_WINDOW (c_dialog), GTK_WIN_POS_MOUSE);
  gtk_widget_show (c_dialog);
}

static void
predefined_color_callback (GtkWidget *widget,
			   gpointer   data)
{
  gint *num;

  num = (gint *) data;

  cvals.color[0] = button_info[*num].red;
  cvals.color[1] = button_info[*num].green;
  cvals.color[2] = button_info[*num].blue;
}

static void
color_changed (GtkWidget *widget,
	       gpointer   data)
{
  gdouble color[3];

  gtk_color_selection_get_color (GTK_COLOR_SELECTION (GTK_COLOR_SELECTION_DIALOG (c_dialog)->colorsel),
				 color);

  cvals.color[0] = (guchar) (color[0] * 255.0);
  cvals.color[1] = (guchar) (color[1] * 255.0);
  cvals.color[2] = (guchar) (color[2] * 255.0);
	
  set_preview_color (preview, cvals.color[0], cvals.color[1], cvals.color[2]);
  gtk_widget_destroy (c_dialog);
}