[recipes/image-import] wip image rotation stuff

[Matthias Clasen <matthiasc src gnome org>]

commit 6935ff8d3d0d76c95cdfe0b198a283e4ce6aae8f
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 18 13:13:52 2017 -0500

    wip image rotation stuff

 src/gr-utils.c |   49 ++++++++++++++++++++++++++++++++++++++++++++++---
 1 files changed, 46 insertions(+), 3 deletions(-)
---
diff --git a/src/gr-utils.c b/src/gr-utils.c
index 0d96c9d..78719cd 100644
--- a/src/gr-utils.c
+++ b/src/gr-utils.c
@@ -38,6 +38,47 @@
 #include "gr-utils.h"
 #include "gr-app.h"
 
+static GdkPixbuf *
+load_oriented_at_size (const char *path, int width, int height)
+{
+        g_autoptr(GdkPixbuf) src = NULL;
+        int transform = 0;
+        const char *orientation;
+
+        src = gdk_pixbuf_new_from_file_at_size (path, width, height, NULL);
+        if (!src)
+                return NULL;
+
+        orientation = gdk_pixbuf_get_option (src, "orientation");
+        if (orientation)
+                transform = (int) g_ascii_strtoll (orientation, NULL, 10);
+
+        if (transform > 4)
+                g_set_object (&src, gdk_pixbuf_new_from_file_at_size (path, height, width, NULL));
+
+        return gdk_pixbuf_apply_embedded_orientation (src);
+}
+
+static GdkPixbuf *
+load_oriented_at_scale (const char *path, int width, int height, gboolean preserve_aspect)
+{
+        g_autoptr(GdkPixbuf) src = NULL;
+        int transform = 0;
+        const char *orientation;
+
+        src = gdk_pixbuf_new_from_file_at_scale (path, width, height, preserve_aspect,  NULL);
+        if (!src)
+                return NULL;
+
+        orientation = gdk_pixbuf_get_option (src, "orientation");
+        if (orientation)
+                transform = (int) g_ascii_strtoll (orientation, NULL, 10);
+
+        if (transform > 4)
+                g_set_object (&src, gdk_pixbuf_new_from_file_at_scale (path, height, width, preserve_aspect, 
NULL));
+
+        return gdk_pixbuf_apply_embedded_orientation (src);
+}
 /* load image rotated by angle to fit in width x height while preserving
  * aspect ratio, filling seams with transparency
  */
@@ -66,11 +107,12 @@ load_pixbuf_fit_size (const char *path,
         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, width, height);
         gdk_pixbuf_fill (pixbuf, 0x00000000);
 
-        original = gdk_pixbuf_new_from_file_at_size (path, load_width, load_height, NULL);
+        original = load_oriented_at_size (path, load_width, load_height);
         if (!original) {
                 g_warning ("Failed to load image %s", path);
                 return pixbuf;
         }
+
         if (angle != 0) {
                 g_autoptr(GdkPixbuf) pb = NULL;
                 pb = gdk_pixbuf_rotate_simple (original, angle);
@@ -116,7 +158,7 @@ load_pixbuf_fill_size (const char *path,
                 load_height = height;
         }
 
-        original = gdk_pixbuf_new_from_file_at_scale (path, -1, load_height, TRUE, NULL);
+        original = load_oriented_at_scale (path, -1, load_height, TRUE);
         if (!original) {
                 GdkPixbuf *pixbuf;
                 g_warning ("Failed to load image %s", path);
@@ -125,6 +167,7 @@ load_pixbuf_fill_size (const char *path,
                 return pixbuf;
         }
 
+
         if (angle != 0) {
                 g_autoptr(GdkPixbuf) pb = NULL;
                 pb = gdk_pixbuf_rotate_simple (original, angle);
@@ -133,7 +176,7 @@ load_pixbuf_fill_size (const char *path,
 
         if (gdk_pixbuf_get_width (original) < width) {
                 g_autoptr(GdkPixbuf) pb1 = NULL;
-                pb1 = gdk_pixbuf_new_from_file_at_scale (path, load_width, -1, TRUE, NULL);
+                pb1 = load_oriented_at_scale (path, load_width, -1, TRUE);
                 g_set_object (&original, pb1);
                 if (angle != 0) {
                         g_autoptr(GdkPixbuf) pb = NULL;