[gnome-software] Try to load HiDPI screenshots on HiDPI hardware

[Richard Hughes <rhughes src gnome org>]

commit 06282dc8c6bd56df4fa5305eafeb1cdce13fb95d
Author: Richard Hughes <richard hughsie com>
Date:   Tue Sep 30 10:43:26 2014 +0100

    Try to load HiDPI screenshots on HiDPI hardware

 src/gs-screenshot-image.c |   36 +++++++++++++++++++++++++++---------
 1 files changed, 27 insertions(+), 9 deletions(-)
---
diff --git a/src/gs-screenshot-image.c b/src/gs-screenshot-image.c
index eecec66..97a522e 100644
--- a/src/gs-screenshot-image.c
+++ b/src/gs-screenshot-image.c
@@ -30,6 +30,7 @@
 #include <libgnome-desktop/gnome-desktop-thumbnail.h>
 
 #include "gs-screenshot-image.h"
+#include "gs-utils.h"
 
 struct _GsScreenshotImagePrivate
 {
@@ -45,6 +46,7 @@ struct _GsScreenshotImagePrivate
        const gchar     *current_image;
        guint            width;
        guint            height;
+       gint             scale;
 };
 
 G_DEFINE_TYPE_WITH_PRIVATE (GsScreenshotImage, gs_screenshot_image, GTK_TYPE_BIN)
@@ -168,13 +170,17 @@ as_screenshot_show_image (GsScreenshotImage *ssimg)
 
        /* show icon */
        if (g_strcmp0 (priv->current_image, "image1") == 0) {
-               if (pixbuf_bg != NULL)
-                       gtk_image_set_from_pixbuf (GTK_IMAGE (priv->image2), pixbuf_bg);
+               if (pixbuf_bg != NULL) {
+                       gs_image_set_from_pixbuf_with_scale (GTK_IMAGE (priv->image2),
+                                                            pixbuf_bg, priv->scale);
+               }
                gtk_stack_set_visible_child_name (GTK_STACK (priv->stack), "image2");
                priv->current_image = "image2";
        } else {
-               if (pixbuf_bg != NULL)
-                       gtk_image_set_from_pixbuf (GTK_IMAGE (priv->image1), pixbuf_bg);
+               if (pixbuf_bg != NULL) {
+                       gs_image_set_from_pixbuf_with_scale (GTK_IMAGE (priv->image1),
+                                                            pixbuf_bg, priv->scale);
+               }
                gtk_stack_set_visible_child_name (GTK_STACK (priv->stack), "image1");
                priv->current_image = "image1";
        }
@@ -326,7 +332,7 @@ void
 gs_screenshot_image_load_async (GsScreenshotImage *ssimg,
                                GCancellable *cancellable)
 {
-       AsImage *im;
+       AsImage *im = NULL;
        GsScreenshotImagePrivate *priv;
        SoupMessage *msg = NULL;
        SoupURI *base_uri = NULL;
@@ -344,10 +350,22 @@ gs_screenshot_image_load_async (GsScreenshotImage *ssimg,
        g_return_if_fail (priv->width != 0);
        g_return_if_fail (priv->height != 0);
 
-       /* test if size specific cachdir exists */
-       im = as_screenshot_get_image (priv->screenshot,
-                                     priv->width,
-                                     priv->height);
+       /* load the HiDPI image if it exists */
+       priv->scale = 1;
+       if (gtk_widget_get_scale_factor (GTK_WIDGET (ssimg)) > 1) {
+               im = as_screenshot_get_image (priv->screenshot,
+                                             priv->width * 2,
+                                             priv->height * 2);
+               if (im != NULL)
+                       priv->scale *= 2;
+       }
+
+       /* fallback to LoDPI if it exists */
+       if (im == NULL) {
+               im = as_screenshot_get_image (priv->screenshot,
+                                             priv->width,
+                                             priv->height);
+       }
        if (im == NULL) {
                /* TRANSLATORS: this is when we request a screenshot size that
                 * the generator did not create or the parser did not add */