From bfab4dc328f580cc21c31ee3e4f53e1b8ca7c4ab Mon Sep 17 00:00:00 2001
From: Bert <ber.t@gmx.com>
Date: Tue, 6 Sep 2011 11:09:57 +0200
Subject: [PATCH] Added EXIF auto-orientation

---
 image.c  | 48 +++++++++++++++++++++++++++++++++++++++++++++++-
 thumbs.c |  9 +++++++++
 2 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/image.c b/image.c
index e018631..486f78d 100644
--- a/image.c
+++ b/image.c
@@ -16,11 +16,12 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
+#include <string.h>
 #include <unistd.h>
+#include <libexif/exif-data.h>
 
 #ifdef GIF_SUPPORT
 #include <stdlib.h>
-#include <string.h>
 #include <sys/types.h>
 #include <gif_lib.h>
 #endif
@@ -37,6 +38,49 @@ enum { MIN_GIF_DELAY = 50 };
 float zoom_min;
 float zoom_max;
 
+void exif_auto_orientate(const fileinfo_t *file) {
+	ExifData *ed;
+	ExifEntry *entry;
+	int byte_order, orientation;
+
+	if (!(ed = exif_data_new_from_file(file->path)))
+		return;
+	entry = exif_content_get_entry(ed->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION);
+	if (entry) {
+		byte_order = exif_data_get_byte_order(ed);
+		orientation = exif_get_short(entry->data, byte_order);
+	}
+	exif_data_unref(ed);
+	if (!entry)
+		return;
+
+	switch (orientation) {
+		case 5:
+			imlib_image_orientate(1);
+		case 2:
+			imlib_image_flip_vertical();
+			break;
+
+		case 3:
+			imlib_image_orientate(2);
+			break;
+
+		case 7:
+			imlib_image_orientate(1);
+		case 4:
+			imlib_image_flip_horizontal();
+			break;
+
+		case 6:
+			imlib_image_orientate(1);
+			break;
+
+		case 8:
+			imlib_image_orientate(270);
+			break;
+	}
+}
+
 void img_init(img_t *img, win_t *win) {
 	zoom_min = zoom_levels[0] / 100.0;
 	zoom_max = zoom_levels[ARRLEN(zoom_levels) - 1] / 100.0;
@@ -241,6 +285,8 @@ int img_load(img_t *img, const fileinfo_t *file) {
 	imlib_context_set_anti_alias(img->aa);
 
 	fmt = imlib_image_format();
+	if (!strcmp(fmt, "jpeg"))
+		exif_auto_orientate(file);
 #ifdef GIF_SUPPORT
 	if (!strcmp(fmt, "gif"))
 		img_load_gif(img, file);
diff --git a/thumbs.c b/thumbs.c
index 5708651..cede997 100644
--- a/thumbs.c
+++ b/thumbs.c
@@ -34,6 +34,8 @@
 #define st_atim st_atimespec
 #endif
 
+void exif_auto_orientate(const fileinfo_t*);
+
 const int thumb_dim = THUMB_SIZE + 10;
 char *cache_dir = NULL;
 
@@ -221,6 +223,7 @@ int tns_load(tns_t *tns, int n, const fileinfo_t *file,
 	float z, zw, zh;
 	thumb_t *t;
 	Imlib_Image *im;
+	const char *fmt;
 
 	if (!tns || !tns->thumbs || !file || !file->name || !file->path)
 		return 0;
@@ -252,6 +255,12 @@ int tns_load(tns_t *tns, int n, const fileinfo_t *file,
 	imlib_context_set_image(im);
 	imlib_context_set_anti_alias(1);
 
+	if (!cache_hit) {
+		fmt = imlib_image_format();
+		if (!strcmp(fmt, "jpeg"))
+			exif_auto_orientate(file);
+	}
+
 	w = imlib_image_get_width();
 	h = imlib_image_get_height();
 	zw = (float) THUMB_SIZE / (float) w;