From 31bf10245282d24870ddb170f653dd1c12c5887d Mon Sep 17 00:00:00 2001
From: Rodolphe Breard <rodolphe@what.tf>
Date: Sat, 12 Sep 2015 18:43:06 +0200
Subject: [PATCH] Do not compress small images. Before this commit, every
 images were reprocessed all of the time. Because the address book may be
 re-compressed when new pictures are added, we want to process them and not
 reprocess the previous ones. This commit include a size detection so images
 below the size limit are not processed.

---
 vcf_compressor.sh | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/vcf_compressor.sh b/vcf_compressor.sh
index 1634ba4..fa2f16d 100755
--- a/vcf_compressor.sh
+++ b/vcf_compressor.sh
@@ -34,12 +34,26 @@ usage () {
     exit "$exit_status"
 }
 
-compress_photo () {
+raw_img () {
     line="$1"
 
+    echo "$line" | cut -d ":" -f2 | base64 -d
+}
+
+compress_photo () {
+    line="$1"
+    max_width="300"
+    max_height="300"
+
     prefix=$(echo "$line" | cut -d ":" -f1)
-    picture=$(echo "$line" | cut -d ":" -f2 | base64 -d | convert "-" -quality 50 -resize "300x300>" "-" | base64 -w0)
-    echo "$prefix:$picture"
+    width=$(raw_img "$line" | identify -format '%w' -)
+    height=$(raw_img "$line" | identify -format '%h' -)
+    if [ "$width" -le "$max_width" ] && [ "$height" -le "$max_height" ] ; then
+        picture=$(raw_img "$line" | convert "-" -quality 50 -resize "${max_width}x${max_height}>" "-" | base64 -w0)
+        echo "$prefix:$picture"
+    else
+        echo "$line"
+    fi
 }
 
 process_line () {