/* testpixbuf -- test program for gdk-pixbuf code
* Copyright (C) 1999 Mark Crichton, Larry Ewing
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <gtk/gtk.h>
typedef struct _LoadContext LoadContext;
struct _LoadContext
{
gchar *filename;
GtkWidget *window;
GdkPixbufLoader *pixbuf_loader;
guint load_timeout;
FILE* image_stream;
};
static void
destroy_context (gpointer data)
{
LoadContext *lc = data;
g_free (lc->filename);
if (lc->load_timeout)
g_source_remove (lc->load_timeout);
if (lc->image_stream)
fclose (lc->image_stream);
if (lc->pixbuf_loader)
{
gdk_pixbuf_loader_close (lc->pixbuf_loader, NULL);
g_object_unref (lc->pixbuf_loader);
}
g_free (lc);
}
static LoadContext*
get_load_context (GtkWidget *image)
{
LoadContext *lc;
lc = g_object_get_data (G_OBJECT (image), "lc");
if (lc == NULL)
{
lc = g_new0 (LoadContext, 1);
g_object_set_data_full (G_OBJECT (image),
"lc",
lc,
destroy_context);
}
return lc;
}
static void
progressive_prepared_callback (GdkPixbufLoader* loader,
gpointer data)
{
GdkPixbuf* pixbuf;
GtkWidget* image;
image = GTK_WIDGET (data);
pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
/* Avoid displaying random memory contents, since the pixbuf
* isn't filled in yet.
*/
gdk_pixbuf_fill (pixbuf, 0xaaaaaaff);
/* Could set the pixbuf instead, if we only wanted to display
* static images.
*/
gtk_image_set_from_animation (GTK_IMAGE (image),
gdk_pixbuf_loader_get_animation (loader));
}
static void
progressive_updated_callback (GdkPixbufLoader* loader,
gint x, gint y, gint width, gint height,
gpointer data)
{
GtkWidget* image;
image = GTK_WIDGET (data);
/* We know the pixbuf inside the GtkImage has changed, but the image
* itself doesn't know this; so queue a redraw. If we wanted to be
* really efficient, we could use a drawing area or something
* instead of a GtkImage, so we could control the exact position of
* the pixbuf on the display, then we could queue a draw for only
* the updated area of the image.
*/
/* We only really need to redraw if the image's animation iterator
* is gdk_pixbuf_animation_iter_on_currently_loading_frame(), but
* who cares.
*/
gtk_widget_queue_draw (image);
}
static gint
progressive_timeout (gpointer data)
{
GtkWidget *image;
LoadContext *lc;
image = GTK_WIDGET (data);
lc = get_load_context (image);
/* This shows off fully-paranoid error handling, so looks scary.
* You could factor out the error handling code into a nice separate
* function to make things nicer.
*/
if (lc->image_stream)
{
size_t bytes_read;
guchar buf[256];
GError *error = NULL;
bytes_read = fread (buf, 1, 256, lc->image_stream);
if (ferror (lc->image_stream))
{
GtkWidget *dialog;
dialog = gtk_message_dialog_new (GTK_WINDOW (lc->window),
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_ERROR,
GTK_BUTTONS_CLOSE,
"Failure reading image file 'alphatest.png': %s",
g_strerror (errno));
g_signal_connect (dialog, "response",
G_CALLBACK (gtk_widget_destroy), NULL);
fclose (lc->image_stream);
lc->image_stream = NULL;
gtk_widget_show (dialog);
lc->load_timeout = 0;
return FALSE; /* uninstall the timeout */
}
if (!gdk_pixbuf_loader_write (lc->pixbuf_loader,
buf, bytes_read,
&error))
{
GtkWidget *dialog;
dialog = gtk_message_dialog_new (GTK_WINDOW (lc->window),
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_ERROR,
GTK_BUTTONS_CLOSE,
"Failed to load image: %s",
error->message);
g_error_free (error);
g_signal_connect (dialog, "response",
G_CALLBACK (gtk_widget_destroy), NULL);
fclose (lc->image_stream);
lc->image_stream = NULL;
gtk_widget_show (dialog);
lc->load_timeout = 0;
return FALSE; /* uninstall the timeout */
}
if (feof (lc->image_stream))
{
fclose (lc->image_stream);
lc->image_stream = NULL;
/* Errors can happen on close, e.g. if the image
* file was truncated we'll know on close that
* it was incomplete.
*/
error = NULL;
if (!gdk_pixbuf_loader_close (lc->pixbuf_loader,
&error))
{
GtkWidget *dialog;
dialog = gtk_message_dialog_new (GTK_WINDOW (lc->window),
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_ERROR,
GTK_BUTTONS_CLOSE,
"Failed to load image: %s",
error->message);
g_error_free (error);
g_signal_connect (dialog, "response",
G_CALLBACK (gtk_widget_destroy), NULL);
gtk_widget_show (dialog);
g_object_unref (lc->pixbuf_loader);
lc->pixbuf_loader = NULL;
lc->load_timeout = 0;
return FALSE; /* uninstall the timeout */
}
g_object_unref (lc->pixbuf_loader);
lc->pixbuf_loader = NULL;
}
}
else
{
lc->image_stream = fopen (lc->filename, "r");
if (lc->image_stream == NULL)
{
GtkWidget *dialog;
dialog = gtk_message_dialog_new (GTK_WINDOW (lc->window),
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_ERROR,
GTK_BUTTONS_CLOSE,
"Unable to open image file '%s': %s",
lc->filename,
g_strerror (errno));
g_signal_connect (dialog, "response",
G_CALLBACK (gtk_widget_destroy), NULL);
gtk_widget_show (dialog);
lc->load_timeout = 0;
return FALSE; /* uninstall the timeout */
}
if (lc->pixbuf_loader)
{
gdk_pixbuf_loader_close (lc->pixbuf_loader, NULL);
g_object_unref (lc->pixbuf_loader);
lc->pixbuf_loader = NULL;
}
lc->pixbuf_loader = gdk_pixbuf_loader_new ();
g_signal_connect (lc->pixbuf_loader, "area_prepared",
G_CALLBACK (progressive_prepared_callback), image);
g_signal_connect (lc->pixbuf_loader, "area_updated",
G_CALLBACK (progressive_updated_callback), image);
}
/* leave timeout installed */
return TRUE;
}
static void
start_progressive_loading (GtkWidget *image)
{
LoadContext *lc;
lc = get_load_context (image);
/* This is obviously totally contrived (we slow down loading
* on purpose to show how incremental loading works).
* The real purpose of incremental loading is the case where
* you are reading data from a slow source such as the network.
* The timeout simply simulates a slow data source by inserting
* pauses in the reading process.
*/
lc->load_timeout = gdk_threads_add_timeout (100,
progressive_timeout,
image);
}
static GtkWidget *
do_image (const char *filename)
{
GtkWidget *frame;
GtkWidget *vbox;
GtkWidget *image;
GtkWidget *label;
GtkWidget *align;
GtkWidget *window;
gchar *str, *escaped;
LoadContext *lc;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Image Loading");
gtk_container_set_border_width (GTK_CONTAINER (window), 8);
vbox = gtk_vbox_new (FALSE, 8);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 8);
gtk_container_add (GTK_CONTAINER (window), vbox);
label = gtk_label_new (NULL);
gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
escaped = g_markup_escape_text (filename, -1);
str = g_strdup_printf ("Progressively loading: <b>%s</b>", escaped);
gtk_label_set_markup (GTK_LABEL (label),
str);
g_free (escaped);
g_free (str);
gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
/* The alignment keeps the frame from growing when users resize
* the window
*/
align = gtk_alignment_new (0.5, 0.5, 0, 0);
gtk_container_add (GTK_CONTAINER (align), frame);
gtk_box_pack_start (GTK_BOX (vbox), align, FALSE, FALSE, 0);
image = gtk_image_new_from_pixbuf (NULL);
gtk_container_add (GTK_CONTAINER (frame), image);
lc = get_load_context (image);
lc->window = window;
lc->filename = g_strdup (filename);
start_progressive_loading (image);
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_main_quit), NULL);
g_signal_connect (window, "delete_event",
G_CALLBACK (gtk_main_quit), NULL);
gtk_widget_show_all (window);
return window;
}
static void
do_nonprogressive (const gchar *filename)
{
GtkWidget *frame;
GtkWidget *vbox;
GtkWidget *image;
GtkWidget *label;
GtkWidget *align;
GtkWidget *window;
gchar *str, *escaped;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Animation");
gtk_container_set_border_width (GTK_CONTAINER (window), 8);
vbox = gtk_vbox_new (FALSE, 8);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 8);
gtk_container_add (GTK_CONTAINER (window), vbox);
label = gtk_label_new (NULL);
gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
escaped = g_markup_escape_text (filename, -1);
str = g_strdup_printf ("Loaded from file: <b>%s</b>", escaped);
gtk_label_set_markup (GTK_LABEL (label),
str);
g_free (escaped);
g_free (str);
gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
/* The alignment keeps the frame from growing when users resize
* the window
*/
align = gtk_alignment_new (0.5, 0.5, 0, 0);
gtk_container_add (GTK_CONTAINER (align), frame);
gtk_box_pack_start (GTK_BOX (vbox), align, FALSE, FALSE, 0);
image = gtk_image_new_from_file (filename);
gtk_container_add (GTK_CONTAINER (frame), image);
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_main_quit), NULL);
g_signal_connect (window, "delete_event",
G_CALLBACK (gtk_main_quit), NULL);
gtk_widget_show_all (window);
}
int
main (int argc,
char **argv)
{
gint i;
gtk_init (&argc, &argv);
i = 1;
while (i < argc)
{
do_image (argv[i]);
do_nonprogressive (argv[i]);
++i;
}
gtk_main ();
return 0;
}