From 6f0b21b11f8711ef425069b277a1c743202174a7 Mon Sep 17 00:00:00 2001
From: Tomas Bzatek <tbzatek@users.sourceforge.net>
Date: Sun, 15 Apr 2012 22:39:24 +0200
Subject: Add HAS_EXIF define

This brings a new HAS_EXIF define which is present when
EXIF information are available. Templates have been modified
to inform user when not available.

The test for EXIF metadata presence is fairly basic, we only look
for aperture, focal length and exposure time attributes. This might
be a subject to change in the future.
---
 src/jpeg-utils.cpp | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

(limited to 'src/jpeg-utils.cpp')

diff --git a/src/jpeg-utils.cpp b/src/jpeg-utils.cpp
index 031ecc0..389b8e4 100644
--- a/src/jpeg-utils.cpp
+++ b/src/jpeg-utils.cpp
@@ -197,6 +197,41 @@ get_exif_data_fixed (ExifData *exif, const gchar *key)
   return get_exif_data (exif, key);
 }
 
+/*
+ *   Returns TRUE if the image contains the key specified
+ */
+gboolean
+exif_has_key (ExifData *exif, const gchar *key)
+{
+  g_return_val_if_fail (exif != NULL, FALSE);
+  g_return_val_if_fail (key != NULL, FALSE);
+
+  try {
+    if (g_strcmp0 (key, JPEG_COMMENT) == 0) {
+      return (! exif->image->comment().empty());
+    }
+
+    if (g_str_has_prefix (key, "Exif.")) {
+      Exiv2::ExifData &exifData = exif->image->exifData();
+      if (! exifData.empty()) {
+        return (! exifData[key].toString().empty());
+      }
+    }
+
+    if (g_str_has_prefix (key, "Iptc.")) {
+      Exiv2::IptcData &iptcData = exif->image->iptcData();
+      if (! iptcData.empty()) {
+        return (! iptcData[key].toString().empty());
+      }
+    }
+
+    return FALSE;
+  }
+  catch (...) {
+    return FALSE;
+  }
+}
+
 
 static void
 autorotate_image (MagickWand *magick_wand)
-- 
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