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