[gnome-software] When using --prefer-local resize, pad and sharpen the images just like the AppStream builder does

[Richard Hughes <rhughes src gnome org>]

commit 8df54bd3f46ed604f2f82115663990c5968ae05f
Author: Richard Hughes <richard hughsie com>
Date:   Mon Jul 7 12:35:44 2014 +0100

    When using --prefer-local resize, pad and sharpen the images just like the AppStream builder does

 src/gs-screenshot-image.c |   38 ++++++++++++++++++++++++++++++++------
 1 files changed, 32 insertions(+), 6 deletions(-)
---
diff --git a/src/gs-screenshot-image.c b/src/gs-screenshot-image.c
index 1eeaaf5..09f7820 100644
--- a/src/gs-screenshot-image.c
+++ b/src/gs-screenshot-image.c
@@ -135,10 +135,13 @@ gs_screenshot_image_complete_cb (SoupSession *session,
                                 SoupMessage *msg,
                                 gpointer user_data)
 {
+       AsImage *im = NULL;
        GsScreenshotImagePrivate *priv;
        GsScreenshotImage *ssimg = GS_SCREENSHOT_IMAGE (user_data);
-       gboolean ret;
        GError *error = NULL;
+       GdkPixbuf *pixbuf = NULL;
+       GInputStream *stream = NULL;
+       gboolean ret;
 
        if (msg->status_code != SOUP_STATUS_OK) {
                /* TRANSLATORS: this is when we try to download a screenshot and
@@ -150,11 +153,28 @@ gs_screenshot_image_complete_cb (SoupSession *session,
 
        priv = gs_screenshot_image_get_instance_private (ssimg);
 
-       /* save to file */
-       ret = g_file_set_contents (priv->filename,
-                                  msg->response_body->data,
-                                  msg->response_body->length,
-                                  &error);
+       /* create a buffer with the data */
+       stream = g_memory_input_stream_new_from_data (msg->response_body->data,
+                                                     msg->response_body->length,
+                                                     NULL);
+       if (stream == NULL)
+               goto out;
+
+       /* load the image */
+       pixbuf = gdk_pixbuf_new_from_stream (stream, NULL, NULL);
+       if (pixbuf == NULL) {
+               /* TRANSLATORS: possibly image file corrupt or not an image */
+               gs_screenshot_image_set_error (ssimg, _("Failed to load image"));
+               goto out;
+       }
+
+       /* save to file, using the same code as the AppStream builder so the
+        * preview looks the same */
+       im = as_image_new ();
+       as_image_set_pixbuf (im, pixbuf);
+       ret = as_image_save_filename (im, priv->filename,
+                                     priv->width, priv->height,
+                                     AS_IMAGE_SAVE_FLAG_PAD_16_9, &error);
        if (!ret) {
                gs_screenshot_image_set_error (ssimg, error->message);
                g_error_free (error);
@@ -164,6 +184,12 @@ gs_screenshot_image_complete_cb (SoupSession *session,
        /* got image, so show */
        as_screenshot_show_image (ssimg);
 out:
+       if (stream != NULL)
+               g_object_unref (stream);
+       if (pixbuf != NULL)
+               g_object_unref (pixbuf);
+       if (im != NULL)
+               g_object_unref (im);
        g_object_unref (ssimg);
 }