tjTransform() was not working properly if r.w=0 or r.h=0

git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@517 632fc199-4ca6-4c93-a231-07263d6284db

2 files changed, 5 insertions, 2 deletions

diff --git a/turbojpeg.h b/turbojpeg.h
index b6a9d91..e075277 100644
--- a/turbojpeg.h
+++ b/turbojpeg.h
@@ -475,9 +475,9 @@ DLLEXPORT tjhandle DLLCALL tjInitTransform(void);
         divisible by tjmcuh[subsamp] (the MCU block height corresponding to the
         level of chrominance subsampling used in the source image)
      r.w = the width of the cropping region.  Setting this to 0 is the
-        equivalent of setting it to the width of the source JPEG image.
+        equivalent of setting it to the width of the source JPEG image - r.x.
      r.h = the height of the cropping region.  Setting this to 0 is the
-        equivalent of setting it to the height of the source JPEG image.
+        equivalent of setting it to the height of the source JPEG image - r.y.
      op = one of the transform operations described in the
         "Transform operations" section above
      options = the bitwise OR of one or more of the transform options described
diff --git a/turbojpegl.c b/turbojpegl.c
index 2a35e2f..266e335 100644
--- a/turbojpegl.c
+++ b/turbojpegl.c
@@ -743,6 +743,7 @@ DLLEXPORT int DLLCALL tjTransform(tjhandle hnd,
 	if((xinfo=(jpeg_transform_info *)malloc(sizeof(jpeg_transform_info)*n))
 		==NULL)
 		_throw("Memory allocation failed in tjTransform()");
+	memset(xinfo, 0, sizeof(jpeg_transform_info)*n);
 
 	for(i=0; i<n; i++)
 	{
@@ -762,10 +763,12 @@ DLLEXPORT int DLLCALL tjTransform(tjhandle hnd,
 			{
 				xinfo[i].crop_width=t[i].r.w;  xinfo[i].crop_width_set=JCROP_POS;
 			}
+			else xinfo[i].crop_width=JCROP_UNSET;
 			if(t[i].r.h!=0)
 			{
 				xinfo[i].crop_height=t[i].r.h;  xinfo[i].crop_height_set=JCROP_POS;
 			}
+			else xinfo[i].crop_height=JCROP_UNSET;
 		}
 	}