From 4222f903ccbd34f46eff4ee6ae4b42abbc379813 Mon Sep 17 00:00:00 2001
From: "Reynaldo H. Verdejo Pinochet" <reynaldo@osg.samsung.com>
Date: Wed, 29 Nov 2017 22:10:51 -0800
Subject: opencv: facedetect: signal gaze direction with color

THIS CHANGE IS NOT MEANT TO BE UPSTREAMED. This is just a mod.
---
 ext/opencv/gstfacedetect.cpp | 47 +++++++++++++++++++++++++++++++++++++-------
 1 file changed, 40 insertions(+), 7 deletions(-)

(limited to 'ext/opencv/gstfacedetect.cpp')

diff --git a/ext/opencv/gstfacedetect.cpp b/ext/opencv/gstfacedetect.cpp
index 1b0d2d474..c2b101669 100644
--- a/ext/opencv/gstfacedetect.cpp
+++ b/ext/opencv/gstfacedetect.cpp
@@ -759,20 +759,21 @@ gst_face_detect_transform_ip (GstOpencvVideoFilter * base, GstBuffer * buf,
       }
 
       if (filter->display) {
-        Point center;
-        Size axes;
+        Point f_center, center;
+        Size f_axes, axes;
         gdouble w, h;
+        guint aim = 0; /* unset. 1=r, 2=left */
+
         gint cb = 255 - ((i & 3) << 7);
         gint cg = 255 - ((i & 12) << 5);
         gint cr = 255 - ((i & 48) << 3);
 
         w = r.width / 2;
         h = r.height / 2;
-        center.x = cvRound ((r.x + w));
-        center.y = cvRound ((r.y + h));
-        axes.width = w;
-        axes.height = h * 1.25; /* tweak for face form */
-        ellipse (img, center, axes, 0, 0, 360, Scalar (cr, cg, cb), 3, 8, 0);
+        f_center.x = cvRound ((r.x + w));
+        f_center.y = cvRound ((r.y + h));
+        f_axes.width = w;
+        f_axes.height = h * 1.25; /* tweak for face form */
 
         if (have_nose) {
           Rect sr = nose[0];
@@ -781,10 +782,18 @@ gst_face_detect_transform_ip (GstOpencvVideoFilter * base, GstBuffer * buf,
           h = sr.height / 2;
           center.x = cvRound ((rnx + sr.x + w));
           center.y = cvRound ((rny + sr.y + h));
+
+          /* left/right toggle */
+          if (center.x > f_center.x)
+            aim = 1;
+          else if (center.x < f_center.x)
+            aim = 2;
+
           axes.width = w;
           axes.height = h * 1.25;       /* tweak for nose form */
           ellipse (img, center, axes, 0, 0, 360, Scalar (cr, cg, cb), 1, 8, 0);
         }
+
         if (have_mouth) {
           Rect sr = mouth[0];
 
@@ -792,10 +801,34 @@ gst_face_detect_transform_ip (GstOpencvVideoFilter * base, GstBuffer * buf,
           h = sr.height / 2;
           center.x = cvRound ((rmx + sr.x + w));
           center.y = cvRound ((rmy + sr.y + h));
+
+          if (!aim) {
+            if (center.x > f_center.x)
+              aim = 1;
+            else if (center.x < f_center.x)
+              aim = 2;
+          }
+
           axes.width = w * 1.5; /* tweak for mouth form */
           axes.height = h;
           ellipse (img, center, axes, 0, 0, 360, Scalar (cr, cg, cb), 1, 8, 0);
         }
+
+        /* Face ellipse */
+        switch (aim) {
+          case 1:
+            ellipse (mtxOrg, f_center, f_axes, 0, 0, 360, Scalar (cr, 0, 0),
+                3, 8, 0);
+            break;
+          case 2:
+            ellipse (mtxOrg, f_center, f_axes, 0, 0, 360, Scalar (0, 0, cb),
+                3, 8, 0);
+            break;
+          default:
+            ellipse (mtxOrg, f_center, f_axes, 0, 0, 360, Scalar (cr, cg, cb),
+                3, 8, 0);
+        }
+
         if (have_eyes) {
           Rect sr = eyes[0];
 
-- 
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