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gimp/app/dialogs/about-dialog.c

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/* GIMP - The GNU 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 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 <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "dialogs-types.h"
#include "core/gimp.h"
#include "core/gimpcontext.h"
#include "pdb/gimppdb.h"
#include "about.h"
#include "about-dialog.h"
#include "authors.h"
#include "gimp-intl.h"
#define PDB_URL_LOAD "plug-in-web-browser"
typedef struct
{
GtkWidget *dialog;
GtkWidget *anim_area;
PangoLayout *layout;
gint n_authors;
gint shuffle[G_N_ELEMENTS (authors) - 1]; /* NULL terminated */
guint timer;
gint index;
gint animstep;
gint textrange[2];
gint state;
gboolean visible;
} GimpAboutDialog;
static void about_dialog_map (GtkWidget *widget,
GimpAboutDialog *dialog);
static void about_dialog_unmap (GtkWidget *widget,
GimpAboutDialog *dialog);
static void about_dialog_load_url (GtkAboutDialog *dialog,
const gchar *url,
gpointer data);
static GdkPixbuf * about_dialog_load_logo (void);
static void about_dialog_add_animation (GtkWidget *vbox,
GimpAboutDialog *dialog);
static gboolean about_dialog_anim_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpAboutDialog *dialog);
static void about_dialog_reshuffle (GimpAboutDialog *dialog);
static gboolean about_dialog_timer (gpointer data);
static void about_dialog_add_message (GtkWidget *vbox);
GtkWidget *
about_dialog_create (GimpContext *context)
{
static GimpAboutDialog *dialog = NULL;
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
if (! dialog)
{
GtkWidget *widget;
GtkWidget *container;
GdkPixbuf *pixbuf;
GList *children;
if (gimp_pdb_lookup_procedure (context->gimp->pdb, PDB_URL_LOAD))
gtk_about_dialog_set_url_hook (about_dialog_load_url,
g_object_ref (context),
(GDestroyNotify) g_object_unref);
dialog = g_new0 (GimpAboutDialog, 1);
dialog->n_authors = G_N_ELEMENTS (authors) - 1;
pixbuf = about_dialog_load_logo ();
widget = g_object_new (GTK_TYPE_ABOUT_DIALOG,
"role", "about-dialog",
"window-position", GTK_WIN_POS_CENTER,
"title", _("About GIMP"),
"program-name", GIMP_ACRONYM,
"version", GIMP_VERSION,
"copyright", GIMP_COPYRIGHT,
"comments", GIMP_NAME,
"license", GIMP_LICENSE,
"wrap-license", TRUE,
"logo", pixbuf,
"website", "http://www.gimp.org/",
"website-label", _("Visit the GIMP website"),
"authors", authors,
"artists", artists,
"documenters", documenters,
/* Translators: insert your names here, separated by newline */
"translator-credits", _("translator-credits"),
NULL);
if (pixbuf)
g_object_unref (pixbuf);
dialog->dialog = widget;
g_object_add_weak_pointer (G_OBJECT (widget), (gpointer) &dialog);
g_signal_connect (widget, "response",
G_CALLBACK (gtk_widget_destroy),
NULL);
g_signal_connect (widget, "map",
G_CALLBACK (about_dialog_map),
dialog);
g_signal_connect (widget, "unmap",
G_CALLBACK (about_dialog_unmap),
dialog);
/* kids, don't try this at home! */
container = gtk_dialog_get_content_area (GTK_DIALOG (widget));
children = gtk_container_get_children (GTK_CONTAINER (container));
if (GTK_IS_VBOX (children->data))
{
about_dialog_add_animation (children->data, dialog);
about_dialog_add_message (children->data);
}
else
g_warning ("%s: ooops, no vbox in this container?", G_STRLOC);
g_list_free (children);
}
gtk_window_present (GTK_WINDOW (dialog->dialog));
return dialog->dialog;
}
static void
about_dialog_map (GtkWidget *widget,
GimpAboutDialog *dialog)
{
if (dialog->layout && dialog->timer == 0)
{
dialog->state = 0;
dialog->index = 0;
dialog->animstep = 0;
dialog->visible = FALSE;
about_dialog_reshuffle (dialog);
dialog->timer = g_timeout_add (800, about_dialog_timer, dialog);
}
}
static void
about_dialog_unmap (GtkWidget *widget,
GimpAboutDialog *dialog)
{
if (dialog->timer)
{
g_source_remove (dialog->timer);
dialog->timer = 0;
}
}
static void
about_dialog_load_url (GtkAboutDialog *dialog,
const gchar *url,
gpointer data)
{
GimpContext *context = GIMP_CONTEXT (data);
GValueArray *return_vals;
return_vals = gimp_pdb_execute_procedure_by_name (context->gimp->pdb,
context, NULL, NULL,
PDB_URL_LOAD,
G_TYPE_STRING, url,
G_TYPE_NONE);
g_value_array_free (return_vals);
}
static GdkPixbuf *
about_dialog_load_logo (void)
{
GdkPixbuf *pixbuf;
gchar *filename;
filename = g_build_filename (gimp_data_directory (), "images",
#ifdef GIMP_UNSTABLE
"gimp-devel-logo.png",
#else
"gimp-logo.png",
#endif
NULL);
pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
g_free (filename);
return pixbuf;
}
static void
about_dialog_add_animation (GtkWidget *vbox,
GimpAboutDialog *dialog)
{
gint height;
dialog->anim_area = gtk_drawing_area_new ();
gtk_box_pack_start (GTK_BOX (vbox), dialog->anim_area, FALSE, FALSE, 0);
gtk_box_reorder_child (GTK_BOX (vbox), dialog->anim_area, 4);
gtk_widget_show (dialog->anim_area);
dialog->layout = gtk_widget_create_pango_layout (dialog->anim_area, NULL);
g_object_weak_ref (G_OBJECT (dialog->anim_area),
(GWeakNotify) g_object_unref, dialog->layout);
pango_layout_get_pixel_size (dialog->layout, NULL, &height);
gtk_widget_set_size_request (dialog->anim_area, -1, 2 * height);
g_signal_connect (dialog->anim_area, "expose-event",
G_CALLBACK (about_dialog_anim_expose),
dialog);
}
static void
about_dialog_reshuffle (GimpAboutDialog *dialog)
{
GRand *gr = g_rand_new ();
gint i;
for (i = 0; i < dialog->n_authors; i++)
dialog->shuffle[i] = i;
/* here we rely on the authors array having Peter and Spencer first */
#define START_INDEX 2
for (i = START_INDEX; i < dialog->n_authors; i++)
{
gint j = g_rand_int_range (gr, START_INDEX, dialog->n_authors);
if (i != j)
{
gint t;
t = dialog->shuffle[j];
dialog->shuffle[j] = dialog->shuffle[i];
dialog->shuffle[i] = t;
}
}
#undef START_INDEX
g_rand_free (gr);
}
static gboolean
about_dialog_anim_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpAboutDialog *dialog)
{
GtkStyle *style = gtk_widget_get_style (widget);
GdkGC *text_gc;
gint x, y;
gint width, height;
if (! dialog->visible)
return FALSE;
text_gc = style->text_gc[GTK_STATE_NORMAL];
pango_layout_get_pixel_size (dialog->layout, &width, &height);
x = (widget->allocation.width - width) / 2;
y = (widget->allocation.height - height) / 2;
if (dialog->textrange[1] > 0)
{
GdkRegion *covered_region = NULL;
GdkRegion *rect_region;
covered_region = gdk_pango_layout_get_clip_region (dialog->layout,
x, y,
dialog->textrange, 1);
rect_region = gdk_region_rectangle (&event->area);
gdk_region_intersect (covered_region, rect_region);
gdk_region_destroy (rect_region);
gdk_gc_set_clip_region (text_gc, covered_region);
gdk_region_destroy (covered_region);
}
gdk_draw_layout (widget->window, text_gc, x, y, dialog->layout);
gdk_gc_set_clip_region (text_gc, NULL);
return FALSE;
}
static gchar *
insert_spacers (const gchar *string)
{
GString *str = g_string_new (NULL);
gchar *normalized;
gchar *ptr;
gunichar unichr;
normalized = g_utf8_normalize (string, -1, G_NORMALIZE_DEFAULT_COMPOSE);
ptr = normalized;
while ((unichr = g_utf8_get_char (ptr)))
{
g_string_append_unichar (str, unichr);
g_string_append_unichar (str, 0x200b); /* ZERO WIDTH SPACE */
ptr = g_utf8_next_char (ptr);
}
g_free (normalized);
return g_string_free (str, FALSE);
}
static void inline
mix_colors (const GdkColor *start,
const GdkColor *end,
GdkColor *target,
gdouble pos)
{
target->red = start->red * (1.0 - pos) + end->red * pos;
target->green = start->green * (1.0 - pos) + end->green * pos;
target->blue = start->blue * (1.0 - pos) + end->blue * pos;
}
static void
decorate_text (GimpAboutDialog *dialog,
gint anim_type,
gdouble time)
{
GtkStyle *style = gtk_widget_get_style (dialog->anim_area);
const gchar *text;
const gchar *ptr;
gint letter_count = 0;
gint text_length = 0;
gint text_bytelen = 0;
gint cluster_start, cluster_end;
gunichar unichr;
PangoAttrList *attrlist = NULL;
PangoAttribute *attr;
PangoRectangle irect = {0, 0, 0, 0};
PangoRectangle lrect = {0, 0, 0, 0};
GdkColor mix;
mix_colors (style->bg + GTK_STATE_NORMAL,
style->fg + GTK_STATE_NORMAL, &mix, time);
text = pango_layout_get_text (dialog->layout);
g_return_if_fail (text != NULL);
text_length = g_utf8_strlen (text, -1);
text_bytelen = strlen (text);
attrlist = pango_attr_list_new ();
dialog->textrange[0] = 0;
dialog->textrange[1] = text_bytelen;
switch (anim_type)
{
case 0: /* Fade in */
attr = pango_attr_foreground_new (mix.red, mix.green, mix.blue);
attr->start_index = 0;
attr->end_index = text_bytelen;
pango_attr_list_insert (attrlist, attr);
break;
case 1: /* Fade in, spread */
attr = pango_attr_foreground_new (mix.red, mix.green, mix.blue);
attr->start_index = 0;
attr->end_index = text_bytelen;
pango_attr_list_change (attrlist, attr);
ptr = text;
cluster_start = 0;
while ((unichr = g_utf8_get_char (ptr)))
{
ptr = g_utf8_next_char (ptr);
cluster_end = (ptr - text);
if (unichr == 0x200b)
{
lrect.width = (1.0 - time) * 15.0 * PANGO_SCALE + 0.5;
attr = pango_attr_shape_new (&irect, &lrect);
attr->start_index = cluster_start;
attr->end_index = cluster_end;
pango_attr_list_change (attrlist, attr);
}
cluster_start = cluster_end;
}
break;
case 2: /* Fade in, sinewave */
attr = pango_attr_foreground_new (mix.red, mix.green, mix.blue);
attr->start_index = 0;
attr->end_index = text_bytelen;
pango_attr_list_change (attrlist, attr);
ptr = text;
cluster_start = 0;
while ((unichr = g_utf8_get_char (ptr)))
{
if (unichr == 0x200b)
{
cluster_end = ptr - text;
attr = pango_attr_rise_new ((1.0 -time) * 18000 *
sin (4.0 * time +
(float) letter_count * 0.7));
attr->start_index = cluster_start;
attr->end_index = cluster_end;
pango_attr_list_change (attrlist, attr);
letter_count++;
cluster_start = cluster_end;
}
ptr = g_utf8_next_char (ptr);
}
break;
case 3: /* letterwise Fade in */
ptr = text;
letter_count = 0;
cluster_start = 0;
while ((unichr = g_utf8_get_char (ptr)))
{
gint border = (text_length + 15) * time - 15;
gdouble pos;
if (letter_count < border)
pos = 0;
else if (letter_count > border + 15)
pos = 1;
else
pos = ((gdouble) (letter_count - border)) / 15;
mix_colors (style->fg + GTK_STATE_NORMAL,
style->bg + GTK_STATE_NORMAL,
&mix, pos);
ptr = g_utf8_next_char (ptr);
cluster_end = ptr - text;
attr = pango_attr_foreground_new (mix.red, mix.green, mix.blue);
attr->start_index = cluster_start;
attr->end_index = cluster_end;
pango_attr_list_change (attrlist, attr);
if (pos < 1.0)
dialog->textrange[1] = cluster_end;
letter_count++;
cluster_start = cluster_end;
}
break;
default:
g_printerr ("Unknown animation type %d\n", anim_type);
}
pango_layout_set_attributes (dialog->layout, attrlist);
pango_attr_list_unref (attrlist);
}
static gboolean
about_dialog_timer (gpointer data)
{
GimpAboutDialog *dialog = data;
gint timeout = 0;
if (dialog->animstep == 0)
{
gchar *text = NULL;
dialog->visible = TRUE;
switch (dialog->state)
{
case 0:
dialog->timer = g_timeout_add (30, about_dialog_timer, dialog);
dialog->state += 1;
return FALSE;
case 1:
text = insert_spacers (_("GIMP is brought to you by"));
dialog->state += 1;
break;
case 2:
if (! (dialog->index < dialog->n_authors))
dialog->index = 0;
text = insert_spacers (authors[dialog->shuffle[dialog->index]]);
dialog->index += 1;
break;
default:
g_return_val_if_reached (TRUE);
break;
}
g_return_val_if_fail (text != NULL, TRUE);
pango_layout_set_text (dialog->layout, text, -1);
pango_layout_set_attributes (dialog->layout, NULL);
g_free (text);
}
if (dialog->animstep < 16)
{
decorate_text (dialog, 2, ((gfloat) dialog->animstep) / 15.0);
}
else if (dialog->animstep == 16)
{
timeout = 800;
}
else if (dialog->animstep == 17)
{
timeout = 30;
}
else if (dialog->animstep < 33)
{
decorate_text (dialog, 1,
1.0 - ((gfloat) (dialog->animstep - 17)) / 15.0);
}
else if (dialog->animstep == 33)
{
dialog->visible = FALSE;
timeout = 300;
}
else
{
dialog->visible = FALSE;
dialog->animstep = -1;
timeout = 30;
}
dialog->animstep++;
gtk_widget_queue_draw (dialog->anim_area);
if (timeout > 0)
{
dialog->timer = g_timeout_add (timeout, about_dialog_timer, dialog);
return FALSE;
}
/* else keep the current timeout */
return TRUE;
}
static void
about_dialog_add_message (GtkWidget *vbox)
{
#ifdef GIMP_UNSTABLE
GtkWidget *label;
label = gtk_label_new (_("This is an unstable development release."));
gimp_label_set_attributes (GTK_LABEL (label),
PANGO_ATTR_STYLE, PANGO_STYLE_ITALIC,
-1);
gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
gtk_box_reorder_child (GTK_BOX (vbox), label, 2);
gtk_widget_show (label);
#endif
}
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