[gtk+/color-management: 6/6] Add a simple test in testpixbuf-color which shows the color management API in use

[Richard Hughes <rhughes src gnome org>]

commit d6dad8a04abb514fc01ebd3ce312ea1c3f382c8c
Author: Richard Hughes <richard hughsie com>
Date:   Tue Mar 2 14:16:57 2010 +0000

    Add a simple test in testpixbuf-color which shows the color management API in use

 demos/testpixbuf-color.c |   80 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 80 insertions(+), 0 deletions(-)
---
diff --git a/demos/testpixbuf-color.c b/demos/testpixbuf-color.c
index 78fa939..9e68736 100644
--- a/demos/testpixbuf-color.c
+++ b/demos/testpixbuf-color.c
@@ -100,6 +100,77 @@ out:
 	return ret;
 }
 
+static gboolean
+transform_image (const gchar *filename, GError **error)
+{
+	GtkWidget *image_test;
+	GtkWidget *dialog;
+	GtkWidget *vbox;
+	gint response;
+	GdkPixbuf *pixbuf;
+	GtkColorEngine *engine = NULL;
+	GtkColorProfile *profile = NULL;
+	GtkColorTransform *transform = NULL;
+	gchar *icc_profile = NULL;
+	gsize len = 0;
+	gboolean ret;
+	const gchar *option;
+
+	image_test = gtk_image_new_from_file (filename);
+	pixbuf = gtk_image_get_pixbuf (GTK_IMAGE(image_test));
+
+	/* check values */
+	option = gdk_pixbuf_get_option (pixbuf, "icc-profile");
+	if (option == NULL) {
+		*error = g_error_new (1, 0, "no profile set");
+		goto out;
+	}
+
+	/* decode base64 */
+	icc_profile = (gchar *) g_base64_decode (option, &len);
+	if (len == 0) {
+		*error = g_error_new (1, 0, "no embedded profile");
+		goto out;
+	}
+
+        /* transform this image with the embedded profile */
+        engine = gtk_color_engine_get_default ();
+        profile = gtk_color_engine_create_profile (engine, (const guint8 *)icc_profile, len, error);
+        if (profile == NULL) {
+                ret = FALSE;
+                goto out;
+        }
+        transform = gtk_color_engine_create_transform_from_profiles (engine, profile, NULL);
+        ret = gtk_color_transform_apply_pixbuf_in_place (transform, pixbuf, error);
+        if (!ret)
+                goto out;
+
+	/* show in a dialog as an example */
+	dialog = gtk_message_dialog_new (NULL, GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO, "Are the fish yellow?");
+	vbox = gtk_dialog_get_content_area (GTK_DIALOG (dialog));
+	gtk_box_pack_end (GTK_BOX(vbox), image_test, TRUE, TRUE, 12);
+	gtk_widget_set_size_request (GTK_WIDGET(image_test), 300, 300);
+	gtk_window_set_resizable (GTK_WINDOW (dialog), TRUE);
+	gtk_widget_show (image_test);
+
+        /* ask the user to ensure the image was converted */
+	response = gtk_dialog_run (GTK_DIALOG (dialog));
+	if (response != GTK_RESPONSE_YES) {
+		ret = FALSE;
+		*error = g_error_new (1, 0, "failed to convert fish");
+		goto out;
+	}
+out:
+        if (transform != NULL)
+                g_object_unref (transform);
+        if (profile != NULL)
+                g_object_unref (profile);
+        if (engine != NULL)
+                g_object_unref (engine);
+	g_free (icc_profile);
+	return ret;
+}
+
 int
 main (int argc, char **argv)
 {
@@ -118,6 +189,15 @@ main (int argc, char **argv)
 					       0, 0, 0, 0, 150, 160);
 
 	/* PASS */
+	g_debug ("try to render color corrected image");
+	ret = transform_image ("icc-profile-fish.png", &error);
+	if (!ret) {
+		g_warning ("FAILED: did not load image: %s", error->message);
+		g_error_free (error);
+		goto out;
+	}
+
+	/* PASS */
 	g_debug ("try to save PNG with a profile");
 	ret = save_image_png ("icc-profile.png", pixbuf, &error);
 	if (!ret) {