fix to properly queue resizes when the image is set

2001-04-18  Havoc Pennington  <hp@redhat.com>

	* gtk/gtkimage.c: fix to properly queue resizes when the image is
	set

	* gtk/gtktextview.c (gtk_text_view_do_popup): desensitize Paste
	if the insertion point isn't editable

	* demos/gtk-demo/images.c: Added a GtkImage demo

	* demos/gtk-demo/drawingarea.c: drawing area demo

	* demos/gtk-demo/menus.c (create_menu): cleanups

2001-04-18  Havoc Pennington  <hp@redhat.com>

	* gdk-pixbuf.c (gdk_pixbuf_fill): Function to fill pixbuf with a
	given color.

1 files changed, 277 insertions, 0 deletions

diff --git a/demos/gtk-demo/pixbufs.c b/demos/gtk-demo/pixbufs.c
new file mode 100644
index 0000000000..6c067098ac
--- /dev/null
+++ b/demos/gtk-demo/pixbufs.c
@@ -0,0 +1,277 @@
+/* Pixbufs
+ *
+ * A GdkPixbuf represents an image, normally in RGB or RGBA format.
+ * Pixbufs are normally used to load files from disk and perform
+ * image scaling.
+ *
+ * This demo is not all that educational, but looks cool. It was written
+ * by Extreme Pixbuf Hacker Federico Mena Quintero. It also shows
+ * off how to use GtkDrawingArea to do a simple animation.
+ *
+ * Look at the Image demo for additional pixbuf usage examples.
+ * 
+ */
+
+#include <config.h>
+#include <stdlib.h>
+#include <gtk/gtk.h>
+#include <math.h>
+
+
+
+#define FRAME_DELAY 50
+
+#define RELATIVE_BACKGROUND_NAME "background.jpg"
+#define INSTALLED_BACKGROUND_NAME DEMOCODEDIR"/background.jpg"
+
+static const char *relative_image_names[] = {
+  "apple-red.png",
+  "gnome-applets.png",
+  "gnome-calendar.png",
+  "gnome-foot.png",
+  "gnome-gmush.png",
+  "gnome-gimp.png",
+  "gnome-gsame.png",
+  "gnu-keys.png"
+};
+
+static const char *installed_image_names[] = {
+  DEMOCODEDIR"/apple-red.png",
+  DEMOCODEDIR"/gnome-applets.png",
+  DEMOCODEDIR"/gnome-calendar.png",
+  DEMOCODEDIR"/gnome-foot.png",
+  DEMOCODEDIR"/gnome-gmush.png",
+  DEMOCODEDIR"/gnome-gimp.png",
+  DEMOCODEDIR"/gnome-gsame.png",
+  DEMOCODEDIR"/gnu-keys.png"
+};
+
+#define N_IMAGES G_N_ELEMENTS (relative_image_names)
+
+/* demo window */
+static GtkWindow *window = NULL;
+
+/* Current frame */
+static GdkPixbuf *frame;
+
+/* Background image */
+static GdkPixbuf *background;
+static int back_width, back_height;
+
+/* Images */
+static GdkPixbuf *images[N_IMAGES];
+
+/* Widgets */
+static GtkWidget *da;
+
+
+
+/* Loads the images for the demo and returns whether the operation succeeded */
+static gboolean
+load_pixbufs (GError **error)
+{
+  int i;
+  const char **image_names;
+
+  if (background)
+    return TRUE; /* already loaded earlier */
+  
+  background = gdk_pixbuf_new_from_file (RELATIVE_BACKGROUND_NAME, NULL);
+
+  if (!background)
+    background = gdk_pixbuf_new_from_file (INSTALLED_BACKGROUND_NAME, error);
+
+  if (!background)
+    return FALSE; /* note that "error" was filled in and returned */
+  
+  back_width = gdk_pixbuf_get_width (background);
+  back_height = gdk_pixbuf_get_height (background);
+
+  if (g_file_test (relative_image_names[0], G_FILE_TEST_EXISTS))
+    image_names = relative_image_names;
+  else
+    image_names = installed_image_names;
+  
+  for (i = 0; i < N_IMAGES; i++)
+    {
+      images[i] = gdk_pixbuf_new_from_file (image_names[i], error);
+      if (!images[i])
+        return FALSE; /* Note that "error" was filled with a GError */
+    }
+
+  return TRUE;
+}
+
+/* Expose callback for the drawing area */
+static gint
+expose_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data)
+{
+  guchar *pixels;
+  int rowstride;
+
+  rowstride = gdk_pixbuf_get_rowstride (frame);
+
+  pixels = gdk_pixbuf_get_pixels (frame) + rowstride * event->area.y + event->area.x * 3;
+		  
+  gdk_draw_rgb_image_dithalign (widget->window,
+                                widget->style->black_gc,
+                                event->area.x, event->area.y,
+                                event->area.width, event->area.height,
+                                GDK_RGB_DITHER_NORMAL,
+                                pixels, rowstride,
+                                event->area.x, event->area.y);
+
+  return TRUE;
+}
+
+#define CYCLE_LEN 60
+
+static int frame_num;
+
+/* Timeout handler to regenerate the frame */
+static gint
+timeout (gpointer data)
+{
+  double f;
+  int i;
+  double xmid, ymid;
+  double radius;
+
+  gdk_pixbuf_copy_area (background, 0, 0, back_width, back_height,
+                        frame, 0, 0);
+
+  f = (double) (frame_num % CYCLE_LEN) / CYCLE_LEN;
+
+  xmid = back_width / 2.0;
+  ymid = back_height / 2.0;
+
+  radius = MIN (xmid, ymid) / 2.0;
+
+  for (i = 0; i < N_IMAGES; i++)
+    {
+      double ang;
+      int xpos, ypos;
+      int iw, ih;
+      double r;
+      GdkRectangle r1, r2, dest;
+      double k;
+
+      ang = 2.0 * M_PI * (double) i / N_IMAGES - f * 2.0 * M_PI;
+
+      iw = gdk_pixbuf_get_width (images[i]);
+      ih = gdk_pixbuf_get_height (images[i]);
+
+      r = radius + (radius / 3.0) * sin (f * 2.0 * M_PI);
+
+      xpos = floor (xmid + r * cos (ang) - iw / 2.0 + 0.5);
+      ypos = floor (ymid + r * sin (ang) - ih / 2.0 + 0.5);
+
+      k = (i & 1) ? sin (f * 2.0 * M_PI) : cos (f * 2.0 * M_PI);
+      k = 2.0 * k * k;
+      k = MAX (0.25, k);
+
+      r1.x = xpos;
+      r1.y = ypos;
+      r1.width = iw * k;
+      r1.height = ih * k;
+
+      r2.x = 0;
+      r2.y = 0;
+      r2.width = back_width;
+      r2.height = back_height;
+
+      if (gdk_rectangle_intersect (&r1, &r2, &dest))
+        gdk_pixbuf_composite (images[i],
+                              frame,
+                              dest.x, dest.y,
+                              dest.width, dest.height,
+                              xpos, ypos,
+                              k, k,
+                              GDK_INTERP_NEAREST,
+                              ((i & 1)
+                               ? MAX (127, fabs (255 * sin (f * 2.0 * M_PI)))
+                               : MAX (127, fabs (255 * cos (f * 2.0 * M_PI)))));
+    }
+
+  gtk_widget_queue_draw (da);
+
+  frame_num++;
+  return TRUE;
+}
+
+static guint timeout_id;
+
+static void
+cleanup_callback (GtkObject *object,
+                  gpointer data)
+{
+  g_source_remove (timeout_id);
+  timeout_id = 0;
+}
+
+GtkWidget *
+do_pixbufs (void)
+{
+  if (!window)
+    {
+      GError *error;
+
+      
+      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+      gtk_window_set_title (GTK_WINDOW (window), "Pixbufs");
+      gtk_window_set_resizeable (GTK_WINDOW (window), FALSE);
+      
+      gtk_signal_connect (GTK_OBJECT (window), "destroy", GTK_SIGNAL_FUNC (gtk_widget_destroyed), &window);
+      gtk_signal_connect (GTK_OBJECT (window), "destroy", GTK_SIGNAL_FUNC (cleanup_callback), NULL);
+
+      
+      error = NULL;
+      if (!load_pixbufs (&error))
+        {
+          GtkWidget *dialog;
+          
+          dialog = gtk_message_dialog_new (GTK_WINDOW (window),
+                                           GTK_DIALOG_DESTROY_WITH_PARENT,
+                                           GTK_MESSAGE_ERROR,
+                                           GTK_BUTTONS_CLOSE,
+                                           "Failed to load an image: %s",
+                                           error->message);
+          
+          g_error_free (error);
+          
+          gtk_signal_connect (GTK_OBJECT (dialog),
+                              "response",
+                              GTK_SIGNAL_FUNC (gtk_widget_destroy),
+                              NULL);
+          
+          gtk_widget_show (dialog);
+        }
+      else
+        {
+          gtk_widget_set_usize (window, back_width, back_height);
+          
+          frame = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, back_width, back_height);
+          
+          da = gtk_drawing_area_new ();
+          
+          gtk_signal_connect (GTK_OBJECT (da), "expose_event",
+                              GTK_SIGNAL_FUNC (expose_cb), NULL);
+          
+          gtk_container_add (GTK_CONTAINER (window), da);
+          
+          timeout_id = gtk_timeout_add (FRAME_DELAY, timeout, NULL);
+        }
+    }
+  
+  if (!GTK_WIDGET_VISIBLE (window))
+    {
+      gtk_widget_show_all (window);
+    }
+  else
+    {
+      gtk_widget_destroy (window);
+      window = NULL;
+    }
+
+  return window;
+}