about-dialog.c 12.4 KB
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "gtk/gtk.h"
#include "about_dialog.h"
#include "interface.h"

#define ANIMATION_STEPS 16
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#define ANIMATION_SIZE 2
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static int  about_dialog_load_logo (GtkWidget *window);
static void about_dialog_destroy (void);
static void about_dialog_unmap (void);
static int  about_dialog_logo_expose (GtkWidget *widget, GdkEventExpose *event);
static int  about_dialog_button (GtkWidget *widget, GdkEventButton *event);
static int  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 unsigned char *dissolve_map = NULL;
static int dissolve_width;
static int dissolve_height;
static int logo_width = 0;
static int logo_height = 0;
static int do_animation = 0;
static int do_scrolling = 0;
static int scroll_state = 0;
static int frame = 0;
static int offset = 0;
static int timer = 0;

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

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

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

  if (!about_dialog)
    {
      about_dialog = gtk_window_new (GTK_WINDOW_DIALOG);
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      gtk_window_set_wmclass (GTK_WINDOW (about_dialog), "about_dialog", "Gimp");
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      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), "delete_event",
			  (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_border_width (GTK_CONTAINER (vbox), 1);
      gtk_container_add (GTK_CONTAINER (about_dialog), vbox);
      gtk_widget_show (vbox);

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      aboutframe = gtk_frame_new (NULL);
      gtk_frame_set_shadow_type (GTK_FRAME (aboutframe), GTK_SHADOW_IN);
      gtk_container_border_width (GTK_CONTAINER (aboutframe), 0);
      gtk_box_pack_start (GTK_BOX (vbox), aboutframe, TRUE, TRUE, 0);
      gtk_widget_show (aboutframe);
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      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);
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      gtk_container_add (GTK_CONTAINER (aboutframe), logo_area);
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      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 ();
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      gdk_font_unref (style->font);
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      style->font = gdk_font_load ("-Adobe-Helvetica-Medium-R-Normal--*-140-*-*-*-*-*-*");
      gtk_widget_push_style (style);

      label = gtk_label_new ("Version " VERSION " brought to you by");
      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, TRUE, 0);
      gtk_widget_show (label);

      label = gtk_label_new ("Spencer Kimball and 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);

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      aboutframe = gtk_frame_new (NULL);
      gtk_frame_set_shadow_type (GTK_FRAME (aboutframe), GTK_SHADOW_IN);
      gtk_container_border_width (GTK_CONTAINER (aboutframe), 0);
      gtk_container_add (GTK_CONTAINER (alignment), aboutframe);
      gtk_widget_show (aboutframe);
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      max_width = 0;
      for (i = 0; i < nscroll_texts; i++)
	{
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	  scroll_text_widths[i] = gdk_string_width (aboutframe->style->font, scroll_text[i]);
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	  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,
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			     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);
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      gtk_widget_show (scroll_area);

      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 int
about_dialog_load_logo (GtkWidget *window)
{
  GtkWidget *preview;
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  GdkGC *gc;
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  char buf[1024];
  unsigned char *pixelrow;
  FILE *fp;
  int count;
  int i, j, k;

  if (logo_pixmap)
    return TRUE;

  sprintf (buf, "%s/gimp_logo.ppm", DATADIR);

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

  fgets (buf, 1024, fp);
  if (strcmp (buf, "P6\n") != 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 (strcmp (buf, "255\n") != 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);
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  logo_pixmap = gdk_pixmap_new (window->window, logo_width, logo_height, 
				gtk_preview_get_visual ()->depth);
  gc = gdk_gc_new (logo_pixmap);
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  gtk_preview_put (GTK_PREVIEW (preview),
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		   logo_pixmap, gc,
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		   0, 0, 0, 0, logo_width, logo_height);
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  gdk_gc_destroy (gc);
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  gtk_widget_unref (preview);
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  g_free (pixelrow);

  fclose (fp);

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  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);
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  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 ()
{
  about_dialog = NULL;
  about_dialog_unmap ();
}

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

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

  return_val = TRUE;

  if (do_animation)
    {
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      if(logo_area->allocation.width != 1)
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	{
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	  for (i = 0, k = 0; i < dissolve_height; i++)
	    for (j = 0; j < dissolve_width; j++, k++)
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	      if (frame == dissolve_map[k])
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		{
		  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;
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	      timer = gtk_timeout_add (75, about_dialog_timer, NULL);
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	      return FALSE;
	    }
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	}
    }

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

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      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;
}
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