Treat YU12 as an alias for I420. Simplify setting of inv_crop_height.

unit_test/video_common_test.cc

 /*
  *  Copyright 2012 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 25 matching lines @@
     return false;
   }
   if (bpp < 0 || bpp > 32) {
     return false;
   }
   return true;
 }
 
 TEST_F(LibYUVBaseTest, TestCanonicalFourCC) {
   EXPECT_EQ(FOURCC_I420, CanonicalFourCC(FOURCC_IYUV));
+  EXPECT_EQ(FOURCC_I420, CanonicalFourCC(FOURCC_YU12));
   EXPECT_EQ(FOURCC_I422, CanonicalFourCC(FOURCC_YU16));
   EXPECT_EQ(FOURCC_I444, CanonicalFourCC(FOURCC_YU24));
   EXPECT_EQ(FOURCC_YUY2, CanonicalFourCC(FOURCC_YUYV));
   EXPECT_EQ(FOURCC_YUY2, CanonicalFourCC(FOURCC_YUVS));
   EXPECT_EQ(FOURCC_UYVY, CanonicalFourCC(FOURCC_HDYC));
   EXPECT_EQ(FOURCC_UYVY, CanonicalFourCC(FOURCC_2VUY));
   EXPECT_EQ(FOURCC_MJPG, CanonicalFourCC(FOURCC_JPEG));
   EXPECT_EQ(FOURCC_MJPG, CanonicalFourCC(FOURCC_DMB1));
   EXPECT_EQ(FOURCC_RAW,  CanonicalFourCC(FOURCC_RGB3));
   EXPECT_EQ(FOURCC_24BG, CanonicalFourCC(FOURCC_BGR3));
@@ skipping 41 matching lines @@
   EXPECT_TRUE(TestValidFourCC(FOURCC_JPEG, FOURCC_BPP_JPEG));
   EXPECT_TRUE(TestValidFourCC(FOURCC_DMB1, FOURCC_BPP_DMB1));
   EXPECT_TRUE(TestValidFourCC(FOURCC_BA81, FOURCC_BPP_BA81));
   EXPECT_TRUE(TestValidFourCC(FOURCC_RGB3, FOURCC_BPP_RGB3));
   EXPECT_TRUE(TestValidFourCC(FOURCC_BGR3, FOURCC_BPP_BGR3));
   EXPECT_TRUE(TestValidFourCC(FOURCC_H264, FOURCC_BPP_H264));
   EXPECT_TRUE(TestValidFourCC(FOURCC_ANY,  FOURCC_BPP_ANY));
 }
 
 }  // namespace libyuv