gimp/app/gui/about-dialog.c

/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include <gtk/gtk.h>

#include "libgimp/gimpfeatures.h"

#include "config.h"
#include "libgimp/gimpintl.h"
#include "libgimp/gimpenv.h"

#include "about_dialog.h"

#define ANIMATION_STEPS 16
#define ANIMATION_SIZE   2

static gint  about_dialog_load_logo   (GtkWidget *window);
static void  about_dialog_destroy     (void);
static void  about_dialog_unmap       (void);
static gint  about_dialog_logo_expose (GtkWidget *widget, GdkEventExpose *event);
static gint  about_dialog_button      (GtkWidget *widget, GdkEventButton *event);
static gint  about_dialog_timer       (gpointer data);


static GtkWidget *about_dialog = NULL;
static GtkWidget *logo_area = NULL;
static GtkWidget *scroll_area = NULL;
static GdkPixmap *logo_pixmap = NULL;
static GdkPixmap *scroll_pixmap = NULL;
static guchar *dissolve_map = NULL;
static gint  dissolve_width;
static gint  dissolve_height;
static gint  logo_width = 0;
static gint  logo_height = 0;
static gint  do_animation = 0;
static gint  do_scrolling = 0;
static gint  scroll_state = 0;
static gint  frame = 0;
static gint  offset = 0;
static gint  timer = 0;

static gchar *scroll_text[] =
{
  "Lauri Alanko",
  "Shawn Amundson",
  "John Beale",
  "Zach Beane",
  "Tom Bech",
  "Marc Bless",
  "Edward Blevins",
  "Roberto Boyd",
  "Simon Budig",
  "Seth Burgess",
  "Brent Burton",
  "Francisco Bustamante",
  "Ed Connel",
  "Jay Cox",
  "Andreas Dilger",
  "Austin Donnelly",
  "Misha Dynin",
  "Larry Ewing",
  "Nick Fetchak",
  "David Forsyth",
  "Jim Geuther",
  "Scott Goehring",
  "Heiko Goller",
  "Michael Hammel",
  "Christoph Hoegl",
  "Wolfgang Hofer",
  "Jan Hubicka",
  "Simon Janes",
  "Tim Janik",
  "Tuomas Kuosmanen",
  "Peter Kirchgessner", 
  "Nick Lamb",
  "Karl LaRocca",
  "Jens Lautenbacher",
  "Laramie Leavitt",
  "Elliot Lee",
  "Raph Levien",
  "Adrian Likins",
  "Ingo Luetkebohle",
  "Josh MacDonald",
  "Ed Mackey",
  "Marcelo Malheiros",
  "Ian Main",
  "Torsten Martinsen",
  "Federico Mena",
  "Adam D. Moss",
  "Shuji Narazaki",
  "Michael Natterer",
  "Sven Neumann",
  "Stephen Robert Norris",
  "Erik Nygren",
  "Miles O'Neal",
  "Jay Painter",
  "Mike Phillips",
  "Raphael Quinet",
  "James Robinson",
  "Mike Schaeffer",
  "Tracy Scott",
  "Manish Singh",
  "Nathan Summers",
  "Mike Sweet",
  "Eiichi Takamori",
  "Tristan Tarrant",
  "Owen Taylor",
  "Ian Tester",
  "Andy Thomas",
  "James Wang",
  "Kris Wehner",
  "Matthew Wilson",
};
static gint nscroll_texts = sizeof (scroll_text) / sizeof (scroll_text[0]);
static gint scroll_text_widths[100] = { 0 };
static gint cur_scroll_text = 0;
static gint cur_scroll_index = 0;

static gint shuffle_array[ sizeof(scroll_text) / sizeof(scroll_text[0]) ];

void
about_dialog_create (gint timeout)
{
  GtkStyle *style;
  GtkWidget *vbox;
  GtkWidget *aboutframe;
  GtkWidget *label;
  GtkWidget *alignment;
  gint max_width;
  gint i;
  gchar *label_text;

  if (!about_dialog)
    {
      about_dialog = gtk_window_new (GTK_WINDOW_DIALOG);
      gtk_window_set_wmclass (GTK_WINDOW (about_dialog), "about_dialog", "Gimp");
      gtk_window_set_title (GTK_WINDOW (about_dialog), _("About the GIMP"));
      gtk_window_set_policy (GTK_WINDOW (about_dialog), FALSE, FALSE, FALSE);
      gtk_window_position (GTK_WINDOW (about_dialog), GTK_WIN_POS_CENTER);
      gtk_signal_connect (GTK_OBJECT (about_dialog), "destroy",
			  (GtkSignalFunc) about_dialog_destroy, NULL);
      gtk_signal_connect (GTK_OBJECT (about_dialog), "unmap_event",
			  (GtkSignalFunc) about_dialog_unmap, NULL);
      gtk_signal_connect (GTK_OBJECT (about_dialog), "button_press_event",
			  (GtkSignalFunc) about_dialog_button, NULL);
      gtk_widget_set_events (about_dialog, GDK_BUTTON_PRESS_MASK);

      if (!about_dialog_load_logo (about_dialog))
	{
	  gtk_widget_destroy (about_dialog);
	  about_dialog = NULL;
	  return;
	}

      vbox = gtk_vbox_new (FALSE, 1);
      gtk_container_set_border_width (GTK_CONTAINER (vbox), 1);
      gtk_container_add (GTK_CONTAINER (about_dialog), vbox);
      gtk_widget_show (vbox);

      aboutframe = gtk_frame_new (NULL);
      gtk_frame_set_shadow_type (GTK_FRAME (aboutframe), GTK_SHADOW_IN);
      gtk_container_set_border_width (GTK_CONTAINER (aboutframe), 0);
      gtk_box_pack_start (GTK_BOX (vbox), aboutframe, TRUE, TRUE, 0);
      gtk_widget_show (aboutframe);

      logo_area = gtk_drawing_area_new ();
      gtk_signal_connect (GTK_OBJECT (logo_area), "expose_event",
			  (GtkSignalFunc) about_dialog_logo_expose, NULL);
      gtk_drawing_area_size (GTK_DRAWING_AREA (logo_area), logo_width, logo_height);
      gtk_widget_set_events (logo_area, GDK_EXPOSURE_MASK);
      gtk_container_add (GTK_CONTAINER (aboutframe), logo_area);
      gtk_widget_show (logo_area);

      gtk_widget_realize (logo_area);
      gdk_window_set_background (logo_area->window, &logo_area->style->black);

      style = gtk_style_new ();
      gdk_font_unref (style->font);
      style->font = gdk_font_load (_("-Adobe-Helvetica-Medium-R-Normal--*-140-*-*-*-*-*-*"));
      gtk_widget_push_style (style);

      label_text = g_strdup_printf("%s%s%s", _("Version "), GIMP_VERSION,
					     _(" brought to you by"));
      label = gtk_label_new (label_text);
      g_free(label_text); label_text=NULL;
      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, TRUE, 0);
      gtk_widget_show (label);

      label = gtk_label_new (_("Spencer Kimball & Peter Mattis"));
      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, TRUE, 0);
      gtk_widget_show (label);

      gtk_widget_pop_style ();

      alignment = gtk_alignment_new (0.5, 0.5, 0.0, 0.0);
      gtk_box_pack_start (GTK_BOX (vbox), alignment, FALSE, TRUE, 0);
      gtk_widget_show (alignment);

      aboutframe = gtk_frame_new (NULL);
      gtk_frame_set_shadow_type (GTK_FRAME (aboutframe), GTK_SHADOW_IN);
      gtk_container_set_border_width (GTK_CONTAINER (aboutframe), 0);
      gtk_container_add (GTK_CONTAINER (alignment), aboutframe);
      gtk_widget_show (aboutframe);

      max_width = 0;
      for (i = 0; i < nscroll_texts; i++)
	{
	  scroll_text_widths[i] = gdk_string_width (aboutframe->style->font, scroll_text[i]);
	  max_width = MAX (max_width, scroll_text_widths[i]);
	}

      scroll_area = gtk_drawing_area_new ();
      gtk_drawing_area_size (GTK_DRAWING_AREA (scroll_area),
			     max_width + 10,
			     aboutframe->style->font->ascent +
			     aboutframe->style->font->descent);
      gtk_widget_set_events (scroll_area, GDK_BUTTON_PRESS_MASK);
      gtk_container_add (GTK_CONTAINER (aboutframe), scroll_area);
      gtk_widget_show (scroll_area);

      label = gtk_label_new (_("Please visit http://www.gimp.org/ for more info"));
      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, TRUE, 0);
      gtk_widget_show (label);

      gtk_widget_realize (scroll_area);
      gdk_window_set_background (scroll_area->window, &scroll_area->style->white);
    }

  if (!GTK_WIDGET_VISIBLE (about_dialog))
    {
      gtk_widget_show (about_dialog);

      do_animation = TRUE;
      do_scrolling = FALSE;
      scroll_state = 0;
      frame = 0;
      offset = 0;

      for (i = 0; i < nscroll_texts; i++) 
	{
	  shuffle_array[i] = i;
	}

      for (i = 0; i < nscroll_texts; i++) 
	{
	  int j, k;
	  j = rand() % nscroll_texts;
	  k = rand() % nscroll_texts;
	  if (j != k) 
	    {
	      int t;
	      t = shuffle_array[j];
	      shuffle_array[j] = shuffle_array[k];
	      shuffle_array[k] = t;
	    }
	}
    }
  else 
    {
      gdk_window_raise(about_dialog->window);
    }
}


static gint
about_dialog_load_logo (GtkWidget *window)
{
  GtkWidget *preview;
  GdkGC *gc;
  gchar buf[1024];
  guchar *pixelrow;
  FILE *fp;
  gint count;
  gint i, j, k;

  if (logo_pixmap)
    return TRUE;

  g_snprintf (buf, sizeof(buf), "%s" G_DIR_SEPARATOR_S "gimp_logo.ppm",
	      gimp_data_directory ());

  fp = fopen (buf, "rb");
  if (!fp)
    return 0;

  fgets (buf, 1024, fp);

  if (strncmp (buf, "P6", 2) != 0)
    {
      fclose (fp);
      return 0;
    }

  fgets (buf, 1024, fp);
  fgets (buf, 1024, fp);
  sscanf (buf, "%d %d", &logo_width, &logo_height);

  fgets (buf, 1024, fp);
  if (strncmp (buf, "255", 3) != 0)
    {
      fclose (fp);
      return 0;
    }

  preview = gtk_preview_new (GTK_PREVIEW_COLOR);
  gtk_preview_size (GTK_PREVIEW (preview), logo_width, logo_height);
  pixelrow = g_new (guchar, logo_width * 3);

  for (i = 0; i < logo_height; i++)
    {
      count = fread (pixelrow, sizeof (unsigned char), logo_width * 3, fp);
      if (count != (logo_width * 3))
	{
	  gtk_widget_destroy (preview);
	  g_free (pixelrow);
	  fclose (fp);
	  return 0;
	}

      gtk_preview_draw_row (GTK_PREVIEW (preview), pixelrow, 0, i, logo_width);
    }

  gtk_widget_realize (window);
  logo_pixmap = gdk_pixmap_new (window->window, logo_width, logo_height, 
				gtk_preview_get_visual ()->depth);
  gc = gdk_gc_new (logo_pixmap);
  gtk_preview_put (GTK_PREVIEW (preview),
		   logo_pixmap, gc,
		   0, 0, 0, 0, logo_width, logo_height);
  gdk_gc_destroy (gc);

  gtk_widget_unref (preview);
  g_free (pixelrow);

  fclose (fp);

  dissolve_width = (logo_width / ANIMATION_SIZE)+(logo_width % ANIMATION_SIZE ==0 ?0 : 1);
  dissolve_height = (logo_height / ANIMATION_SIZE)+(logo_height % ANIMATION_SIZE ==0 ?0 : 1);

  dissolve_map = g_new (guchar, dissolve_width * dissolve_height);

  srand (time (NULL));

  for (i = 0, k = 0; i < dissolve_height; i++)
    for (j = 0; j < dissolve_width; j++, k++)
      dissolve_map[k] = rand () % ANIMATION_STEPS;

  return TRUE;
}

static void
about_dialog_destroy (void)
{
  about_dialog = NULL;
  about_dialog_unmap ();
}

static void
about_dialog_unmap (void)
{
  if (timer)
    {
      gtk_timeout_remove (timer);
      timer = 0;
    }
}

static gint
about_dialog_logo_expose (GtkWidget      *widget,
			  GdkEventExpose *event)
{
  if (do_animation)
    {
      if (!timer)
	{
	  about_dialog_timer (widget);
	  timer = gtk_timeout_add (75, about_dialog_timer, NULL);
	}
    }
  else
    {
      /* If we draw beyond the boundaries of the pixmap, then X
	 will generate an expose area for those areas, starting
	 an infinite cycle. We now set allow_grow = FALSE, so
	 the drawing area can never be bigger than the preview.
         Otherwise, it would be necessary to intersect event->area
         with the pixmap boundary rectangle. */

      gdk_draw_pixmap (widget->window,
		       widget->style->black_gc,
		       logo_pixmap, 
		       event->area.x, event->area.y,
		       event->area.x, event->area.y,
		       event->area.width, event->area.height);
    }

  return FALSE;
}

static gint
about_dialog_button (GtkWidget      *widget,
		     GdkEventButton *event)
{
  if (timer)
    gtk_timeout_remove (timer);
  timer = 0;
  frame = 0;

  gtk_widget_hide (about_dialog);

  return FALSE;
}

static gint
about_dialog_timer (gpointer data)
{
  gint i, j, k;
  gint return_val;

  return_val = TRUE;

  if (do_animation)
    {
      if(logo_area->allocation.width != 1)
	{
	  for (i = 0, k = 0; i < dissolve_height; i++)
	    for (j = 0; j < dissolve_width; j++, k++)
	      if (frame == dissolve_map[k])
		{
		  gdk_draw_pixmap (logo_area->window,
				   logo_area->style->black_gc,
				   logo_pixmap,
				   j * ANIMATION_SIZE, i * ANIMATION_SIZE, j * ANIMATION_SIZE, i * ANIMATION_SIZE,
				   ANIMATION_SIZE, ANIMATION_SIZE);
		}

	  frame += 1;

	  if (frame == ANIMATION_STEPS)
	    {
	      do_animation = FALSE;
	      do_scrolling = TRUE;
	      frame = 0;

	      timer = gtk_timeout_add (75, about_dialog_timer, NULL);

	      return FALSE;
	    }
	}
    }

  if (do_scrolling)
    {
      if (!scroll_pixmap)
	scroll_pixmap = gdk_pixmap_new (scroll_area->window,
					scroll_area->allocation.width,
					scroll_area->allocation.height,
					-1);
  

      switch (scroll_state)
	{
	case 1:
	  scroll_state = 2;
	  timer = gtk_timeout_add (700, about_dialog_timer, NULL);
	  return_val = FALSE;
	  break;
	case 2:
	  scroll_state = 3;
	  timer = gtk_timeout_add (75, about_dialog_timer, NULL);
	  return_val = FALSE;
	  break;
	}

      if (offset > (scroll_text_widths[cur_scroll_text] + scroll_area->allocation.width))
	{
	  scroll_state = 0;
	  cur_scroll_index += 1;
	  if (cur_scroll_index == nscroll_texts)
	    cur_scroll_index = 0;
	  
	  cur_scroll_text = shuffle_array[cur_scroll_index];

	  offset = 0;
	}

      gdk_draw_rectangle (scroll_pixmap,
			  scroll_area->style->white_gc,
			  TRUE, 0, 0,
			  scroll_area->allocation.width,
			  scroll_area->allocation.height);
      gdk_draw_string (scroll_pixmap,
		       scroll_area->style->font,
		       scroll_area->style->black_gc,
		       scroll_area->allocation.width - offset,
		       scroll_area->style->font->ascent,
		       scroll_text[cur_scroll_text]);
      gdk_draw_pixmap (scroll_area->window,
		       scroll_area->style->black_gc,
		       scroll_pixmap, 0, 0, 0, 0,
		       scroll_area->allocation.width,
		       scroll_area->allocation.height);

      offset += 15;
      if (scroll_state == 0)
	{
	  if (offset > ((scroll_area->allocation.width + scroll_text_widths[cur_scroll_text]) / 2))
	    {
	      scroll_state = 1;
	      offset = (scroll_area->allocation.width + scroll_text_widths[cur_scroll_text]) / 2;
	    }
	}
    }

  return return_val;
}