Fill image including the padding areas

To avoid uninitialized value access.

Change-Id: I842d822bc2e9f4e5dea31fb8ea8415c269c48f22

test/encode_api_test.cc

diff --git a/test/encode_api_test.cc b/test/encode_api_test.cc
index 19bedc6..a57dadc 100644
--- a/test/encode_api_test.cc
+++ b/test/encode_api_test.cc
@@ -51,8 +51,8 @@
 static void FillImage(aom_image_t *img, uint8_t val) {
   for (int p = 0; p < 3; ++p) {
     uint8_t *buf = img->planes[p];
-    const int w = aom_img_plane_width(img, p);
-    const int h = aom_img_plane_height(img, p);
+    const int h = p == 0 ? (int)img->h : (int)((img->h + 1) / 2);
+    const int w = p == 0 ? (int)img->w : (int)((img->w + 1) / 2);
     for (int r = 0; r < h; ++r) {
       memset(buf, val, w);
       buf += img->stride[p];
@@ -65,8 +65,8 @@
   rnd.Reset(::libaom_test::ACMRandom::DeterministicSeed());
   for (int p = 0; p < 3; ++p) {
     uint8_t *buf = img->planes[p];
-    const int h = p == 0 ? (int)img->d_h : (int)((img->d_h + 1) / 2);
-    const int w = p == 0 ? (int)img->d_w : (int)((img->d_w + 1) / 2);
+    const int h = p == 0 ? (int)img->h : (int)((img->h + 1) / 2);
+    const int w = p == 0 ? (int)img->w : (int)((img->w + 1) / 2);
     for (int r = 0; r < h; ++r) {
       for (int c = 0; c < w; ++c) {
         buf[c] = rnd.Rand8();