Add LIBYUV_API to NV12ToABGR and I444Rotate, I444Scale

Gaussian blur low levels ported to 32 bit neon.
But they are not hooked up to anything but a unittest.

Bug:b/248041731, b/132108021, b/129908793
Change-Id: Iccebb8ffd6b719810aa11dd770a525227da4c357
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/1611206
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Chong Zhang <chz@google.com>

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1727
+Version: 1730
 License: BSD
 License File: LICENSE
 

include/libyuv/convert_argb.h

@@ -256,6 +256,7 @@ int NV21ToARGB(const uint8_t* src_y,
                int height);
 
 // Convert NV12 to ABGR.
+LIBYUV_API
 int NV12ToABGR(const uint8_t* src_y,
                int src_stride_y,
                const uint8_t* src_uv,

include/libyuv/scale.h

@@ -126,6 +126,25 @@ int I444Scale(const uint8_t* src_y,
               int dst_height,
               enum FilterMode filtering);
 
+LIBYUV_API
+int I444Scale_16(const uint16_t* src_y,
+                 int src_stride_y,
+                 const uint16_t* src_u,
+                 int src_stride_u,
+                 const uint16_t* src_v,
+                 int src_stride_v,
+                 int src_width,
+                 int src_height,
+                 uint16_t* dst_y,
+                 int dst_stride_y,
+                 uint16_t* dst_u,
+                 int dst_stride_u,
+                 uint16_t* dst_v,
+                 int dst_stride_v,
+                 int dst_width,
+                 int dst_height,
+                 enum FilterMode filtering);
+
 #ifdef __cplusplus
 // Legacy API.  Deprecated.
 LIBYUV_API

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1727
+#define LIBYUV_VERSION 1730
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_

source/convert_argb.cc

@@ -1793,8 +1793,9 @@ int NV21ToARGB(const uint8_t* src_y,
 }
 
 // Convert NV12 to ABGR.
-// To output ABGR instead of ARGB swap the UV and use a mirrrored yuc matrix.
+// To output ABGR instead of ARGB swap the UV and use a mirrored yuv matrix.
 // To swap the UV use NV12 instead of NV21.LIBYUV_API
+LIBYUV_API
 int NV12ToABGR(const uint8_t* src_y,
                int src_stride_y,
                const uint8_t* src_uv,

source/rotate.cc

@@ -521,28 +521,19 @@ int I444Rotate(const uint8_t* src_y,
       CopyPlane(src_v, src_stride_v, dst_v, dst_stride_v, width, height);
       return 0;
     case libyuv::kRotate90:
-      RotatePlane90(src_y, src_stride_y, dst_y, dst_stride_y,
-        width, height);
-      RotatePlane90(src_u, src_stride_u, dst_u, dst_stride_u,
-       width, height);
-      RotatePlane90(src_v, src_stride_v, dst_v, dst_stride_v,
-       width, height);
+      RotatePlane90(src_y, src_stride_y, dst_y, dst_stride_y, width, height);
+      RotatePlane90(src_u, src_stride_u, dst_u, dst_stride_u, width, height);
+      RotatePlane90(src_v, src_stride_v, dst_v, dst_stride_v, width, height);
       return 0;
     case libyuv::kRotate270:
-      RotatePlane270(src_y, src_stride_y, dst_y, dst_stride_y,
-        width, height);
-      RotatePlane270(src_u, src_stride_u, dst_u, dst_stride_u,
-        width, height);
-      RotatePlane270(src_v, src_stride_v, dst_v, dst_stride_v,
-        width, height);
+      RotatePlane270(src_y, src_stride_y, dst_y, dst_stride_y, width, height);
+      RotatePlane270(src_u, src_stride_u, dst_u, dst_stride_u, width, height);
+      RotatePlane270(src_v, src_stride_v, dst_v, dst_stride_v, width, height);
       return 0;
     case libyuv::kRotate180:
-      RotatePlane180(src_y, src_stride_y, dst_y, dst_stride_y,
-        width, height);
-      RotatePlane180(src_u, src_stride_u, dst_u, dst_stride_u,
-        width, height);
-      RotatePlane180(src_v, src_stride_v, dst_v, dst_stride_v,
-        width, height);
+      RotatePlane180(src_y, src_stride_y, dst_y, dst_stride_y, width, height);
+      RotatePlane180(src_u, src_stride_u, dst_u, dst_stride_u, width, height);
+      RotatePlane180(src_v, src_stride_v, dst_v, dst_stride_v, width, height);
       return 0;
     default:
       break;

source/row_neon.cc

@@ -2685,6 +2685,84 @@ void ByteToFloatRow_NEON(const uint8_t* src,
       : "cc", "memory", "q1", "q2", "q3");
 }
 
+// filter 5 rows with 1, 4, 6, 4, 1 coefficients to produce 1 row.
+void GaussCol_NEON(const uint16_t* src0,
+                   const uint16_t* src1,
+                   const uint16_t* src2,
+                   const uint16_t* src3,
+                   const uint16_t* src4,
+                   uint32_t* dst,
+                   int width) {
+  asm volatile(
+      "vmov.u16   d6, #4                         \n"  // constant 4
+      "vmov.u16   d7, #6                         \n"  // constant 6
+
+      "1:                                        \n"
+      "vld1.16    {q1}, [%0]!                    \n"  // load 8 samples, 5 rows
+      "vld1.16    {q2}, [%4]!                    \n"
+      "vaddl.u16  q0, d2, d4                     \n"  // * 1
+      "vaddl.u16  q1, d3, d5                     \n"  // * 1
+      "vld1.16    {q2}, [%1]!                    \n"
+      "vmlal.u16  q0, d4, d6                     \n"  // * 4
+      "vmlal.u16  q1, d5, d6                     \n"  // * 4
+      "vld1.16    {q2}, [%2]!                    \n"
+      "vmlal.u16  q0, d4, d7                     \n"  // * 6
+      "vmlal.u16  q1, d5, d7                     \n"  // * 6
+      "vld1.16    {q2}, [%3]!                    \n"
+      "vmlal.u16  q0, d4, d6                     \n"  // * 4
+      "vmlal.u16  q1, d5, d6                     \n"  // * 4
+      "subs       %6, %6, #8                     \n"  // 8 processed per loop
+      "vst1.32    {q0, q1}, [%5]!                \n"  // store 8 samples
+      "bgt        1b                             \n"
+      : "+r"(src0),  // %0
+        "+r"(src1),  // %1
+        "+r"(src2),  // %2
+        "+r"(src3),  // %3
+        "+r"(src4),  // %4
+        "+r"(dst),   // %5
+        "+r"(width)  // %6
+      :
+      : "cc", "memory", "q0", "q1", "q2", "q3");
+}
+
+// filter 5 rows with 1, 4, 6, 4, 1 coefficients to produce 1 row.
+void GaussRow_NEON(const uint32_t* src, uint16_t* dst, int width) {
+  const uint32_t* src1 = src + 1;
+  const uint32_t* src2 = src + 2;
+  const uint32_t* src3 = src + 3;
+  asm volatile(
+      "vmov.u32    q10, #4                        \n"  // constant 4
+      "vmov.u32    q11, #6                        \n"  // constant 6
+
+      "1:                                        \n"
+      "vld1.32     {q0, q1}, [%0]!               \n"  // load 12 source samples
+      "vld1.32     {q2}, [%0]                    \n"
+      "vadd.u32    q0, q0, q1                    \n"  // * 1
+      "vadd.u32    q1, q1, q2                    \n"  // * 1
+      "vld1.32     {q2, q3}, [%2]!               \n"
+      "vmla.u32    q0, q2, q11                   \n"  // * 6
+      "vmla.u32    q1, q3, q11                   \n"  // * 6
+      "vld1.32     {q2, q3}, [%1]!               \n"
+      "vld1.32     {q8, q9}, [%3]!               \n"
+      "vadd.u32    q2, q2, q8                    \n"  // add rows for * 4
+      "vadd.u32    q3, q3, q9                    \n"
+      "vmla.u32    q0, q2, q10                   \n"  // * 4
+      "vmla.u32    q1, q3, q10                   \n"  // * 4
+      "subs        %5, %5, #8                    \n"  // 8 processed per loop
+      "vqshrn.u32  d0, q0, #8                    \n"  // round and pack
+      "vqshrn.u32  d1, q1, #8                    \n"
+      "vst1.u16    {q0}, [%4]!                   \n"  // store 8 samples
+      "bgt         1b                            \n"
+      : "+r"(src),   // %0
+        "+r"(src1),  // %1
+        "+r"(src2),  // %2
+        "+r"(src3),  // %3
+        "+r"(dst),   // %4
+        "+r"(width)  // %5
+      :
+      : "cc", "memory", "q0", "q1", "q2", "q3", "q8", "q9", "q10", "q11");
+}
+
 // Convert biplanar NV21 to packed YUV24
 void NV21ToYUV24Row_NEON(const uint8_t* src_y,
                          const uint8_t* src_vu,

source/scale.cc

@@ -1824,6 +1824,39 @@ int I444Scale(const uint8_t* src_y,
   return 0;
 }
 
+LIBYUV_API
+int I444Scale_16(const uint16_t* src_y,
+                 int src_stride_y,
+                 const uint16_t* src_u,
+                 int src_stride_u,
+                 const uint16_t* src_v,
+                 int src_stride_v,
+                 int src_width,
+                 int src_height,
+                 uint16_t* dst_y,
+                 int dst_stride_y,
+                 uint16_t* dst_u,
+                 int dst_stride_u,
+                 uint16_t* dst_v,
+                 int dst_stride_v,
+                 int dst_width,
+                 int dst_height,
+                 enum FilterMode filtering) {
+  if (!src_y || !src_u || !src_v || src_width == 0 || src_height == 0 ||
+      src_width > 32768 || src_height > 32768 || !dst_y || !dst_u || !dst_v ||
+      dst_width <= 0 || dst_height <= 0) {
+    return -1;
+  }
+
+  ScalePlane_16(src_y, src_stride_y, src_width, src_height, dst_y, dst_stride_y,
+                dst_width, dst_height, filtering);
+  ScalePlane_16(src_u, src_stride_u, src_width, src_height, dst_u, dst_stride_u,
+                dst_width, dst_height, filtering);
+  ScalePlane_16(src_v, src_stride_v, src_width, src_height, dst_v, dst_stride_v,
+                dst_width, dst_height, filtering);
+  return 0;
+}
+
 // Deprecated api
 LIBYUV_API
 int Scale(const uint8_t* src_y,

unit_test/planar_test.cc

@@ -3186,7 +3186,8 @@ TEST_F(LibYUVPlanarTest, TestGaussRow_Opt) {
   }
   GaussRow_C(&orig_pixels[0], &dst_pixels_c[0], 640);
   for (int i = 0; i < benchmark_pixels_div1280_ * 2; ++i) {
-#if !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__)
+#if !defined(LIBYUV_DISABLE_NEON) && \
+    (defined(__aarch64__) || defined(__ARM_NEON__) || defined(LIBYUV_NEON))
     int has_neon = TestCpuFlag(kCpuHasNEON);
     if (has_neon) {
       GaussRow_NEON(&orig_pixels[0], &dst_pixels_opt[0], 640);
@@ -3239,7 +3240,8 @@ TEST_F(LibYUVPlanarTest, TestGaussCol_Opt) {
              &orig_pixels[640 * 3], &orig_pixels[640 * 4], &dst_pixels_c[0],
              640);
   for (int i = 0; i < benchmark_pixels_div1280_ * 2; ++i) {
-#if !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__)
+#if !defined(LIBYUV_DISABLE_NEON) && \
+    (defined(__aarch64__) || defined(__ARM_NEON__) || defined(LIBYUV_NEON))
     int has_neon = TestCpuFlag(kCpuHasNEON);
     if (has_neon) {
       GaussCol_NEON(&orig_pixels[0], &orig_pixels[640], &orig_pixels[640 * 2],

unit_test/rotate_test.cc

@@ -135,6 +135,123 @@ TEST_F(LibYUVRotateTest, DISABLED_I420Rotate270_Odd) {
                  benchmark_cpu_info_);
 }
 
+static void I444TestRotate(int src_width,
+                           int src_height,
+                           int dst_width,
+                           int dst_height,
+                           libyuv::RotationMode mode,
+                           int benchmark_iterations,
+                           int disable_cpu_flags,
+                           int benchmark_cpu_info) {
+  if (src_width < 1) {
+    src_width = 1;
+  }
+  if (src_height == 0) {
+    src_height = 1;
+  }
+  if (dst_width < 1) {
+    dst_width = 1;
+  }
+  if (dst_height < 1) {
+    dst_height = 1;
+  }
+  int src_i444_y_size = src_width * Abs(src_height);
+  int src_i444_uv_size = src_width * Abs(src_height);
+  int src_i444_size = src_i444_y_size + src_i444_uv_size * 2;
+  align_buffer_page_end(src_i444, src_i444_size);
+  for (int i = 0; i < src_i444_size; ++i) {
+    src_i444[i] = fastrand() & 0xff;
+  }
+
+  int dst_i444_y_size = dst_width * dst_height;
+  int dst_i444_uv_size = dst_width * dst_height;
+  int dst_i444_size = dst_i444_y_size + dst_i444_uv_size * 2;
+  align_buffer_page_end(dst_i444_c, dst_i444_size);
+  align_buffer_page_end(dst_i444_opt, dst_i444_size);
+  memset(dst_i444_c, 2, dst_i444_size);
+  memset(dst_i444_opt, 3, dst_i444_size);
+
+  MaskCpuFlags(disable_cpu_flags);  // Disable all CPU optimization.
+  I444Rotate(src_i444, src_width, src_i444 + src_i444_y_size, src_width,
+             src_i444 + src_i444_y_size + src_i444_uv_size, src_width,
+             dst_i444_c, dst_width, dst_i444_c + dst_i444_y_size, dst_width,
+             dst_i444_c + dst_i444_y_size + dst_i444_uv_size, dst_width,
+             src_width, src_height, mode);
+
+  MaskCpuFlags(benchmark_cpu_info);  // Enable all CPU optimization.
+  for (int i = 0; i < benchmark_iterations; ++i) {
+    I444Rotate(src_i444, src_width, src_i444 + src_i444_y_size, src_width,
+               src_i444 + src_i444_y_size + src_i444_uv_size, src_width,
+               dst_i444_opt, dst_width, dst_i444_opt + dst_i444_y_size,
+               dst_width, dst_i444_opt + dst_i444_y_size + dst_i444_uv_size,
+               dst_width, src_width, src_height, mode);
+  }
+
+  // Rotation should be exact.
+  for (int i = 0; i < dst_i444_size; ++i) {
+    EXPECT_EQ(dst_i444_c[i], dst_i444_opt[i]);
+  }
+
+  free_aligned_buffer_page_end(dst_i444_c);
+  free_aligned_buffer_page_end(dst_i444_opt);
+  free_aligned_buffer_page_end(src_i444);
+}
+
+TEST_F(LibYUVRotateTest, I444Rotate0_Opt) {
+  I444TestRotate(benchmark_width_, benchmark_height_, benchmark_width_,
+                 benchmark_height_, kRotate0, benchmark_iterations_,
+                 disable_cpu_flags_, benchmark_cpu_info_);
+}
+
+TEST_F(LibYUVRotateTest, I444Rotate90_Opt) {
+  I444TestRotate(benchmark_width_, benchmark_height_, benchmark_height_,
+                 benchmark_width_, kRotate90, benchmark_iterations_,
+                 disable_cpu_flags_, benchmark_cpu_info_);
+}
+
+TEST_F(LibYUVRotateTest, I444Rotate180_Opt) {
+  I444TestRotate(benchmark_width_, benchmark_height_, benchmark_width_,
+                 benchmark_height_, kRotate180, benchmark_iterations_,
+                 disable_cpu_flags_, benchmark_cpu_info_);
+}
+
+TEST_F(LibYUVRotateTest, I444Rotate270_Opt) {
+  I444TestRotate(benchmark_width_, benchmark_height_, benchmark_height_,
+                 benchmark_width_, kRotate270, benchmark_iterations_,
+                 disable_cpu_flags_, benchmark_cpu_info_);
+}
+
+// TODO(fbarchard): Remove odd width tests.
+// Odd width tests work but disabled because they use C code and can be
+// tested by passing an odd width command line or environment variable.
+TEST_F(LibYUVRotateTest, DISABLED_I444Rotate0_Odd) {
+  I444TestRotate(benchmark_width_ - 3, benchmark_height_ - 1,
+                 benchmark_width_ - 3, benchmark_height_ - 1, kRotate0,
+                 benchmark_iterations_, disable_cpu_flags_,
+                 benchmark_cpu_info_);
+}
+
+TEST_F(LibYUVRotateTest, DISABLED_I444Rotate90_Odd) {
+  I444TestRotate(benchmark_width_ - 3, benchmark_height_ - 1,
+                 benchmark_height_ - 1, benchmark_width_ - 3, kRotate90,
+                 benchmark_iterations_, disable_cpu_flags_,
+                 benchmark_cpu_info_);
+}
+
+TEST_F(LibYUVRotateTest, DISABLED_I444Rotate180_Odd) {
+  I444TestRotate(benchmark_width_ - 3, benchmark_height_ - 1,
+                 benchmark_width_ - 3, benchmark_height_ - 1, kRotate180,
+                 benchmark_iterations_, disable_cpu_flags_,
+                 benchmark_cpu_info_);
+}
+
+TEST_F(LibYUVRotateTest, DISABLED_I444Rotate270_Odd) {
+  I444TestRotate(benchmark_width_ - 3, benchmark_height_ - 1,
+                 benchmark_height_ - 1, benchmark_width_ - 3, kRotate270,
+                 benchmark_iterations_, disable_cpu_flags_,
+                 benchmark_cpu_info_);
+}
+
 static void NV12TestRotate(int src_width,
                            int src_height,
                            int dst_width,

unit_test/scale_test.cc

@@ -22,14 +22,14 @@
 namespace libyuv {
 
 // Test scaling with C vs Opt and return maximum pixel difference. 0 = exact.
-static int TestFilter(int src_width,
-                      int src_height,
-                      int dst_width,
-                      int dst_height,
-                      FilterMode f,
-                      int benchmark_iterations,
-                      int disable_cpu_flags,
-                      int benchmark_cpu_info) {
+static int I420TestFilter(int src_width,
+                          int src_height,
+                          int dst_width,
+                          int dst_height,
+                          FilterMode f,
+                          int benchmark_iterations,
+                          int disable_cpu_flags,
+                          int benchmark_cpu_info) {
   if (!SizeValid(src_width, src_height, dst_width, dst_height)) {
     return 0;
   }
@@ -141,14 +141,14 @@ static int TestFilter(int src_width,
 
 // Test scaling with 8 bit C vs 16 bit C and return maximum pixel difference.
 // 0 = exact.
-static int TestFilter_16(int src_width,
-                         int src_height,
-                         int dst_width,
-                         int dst_height,
-                         FilterMode f,
-                         int benchmark_iterations,
-                         int disable_cpu_flags,
-                         int benchmark_cpu_info) {
+static int I420TestFilter_16(int src_width,
+                             int src_height,
+                             int dst_width,
+                             int dst_height,
+                             FilterMode f,
+                             int benchmark_iterations,
+                             int disable_cpu_flags,
+                             int benchmark_cpu_info) {
   if (!SizeValid(src_width, src_height, dst_width, dst_height)) {
     return 0;
   }
@@ -256,6 +256,241 @@ static int TestFilter_16(int src_width,
   return max_diff;
 }
 
+// Test scaling with C vs Opt and return maximum pixel difference. 0 = exact.
+static int I444TestFilter(int src_width,
+                          int src_height,
+                          int dst_width,
+                          int dst_height,
+                          FilterMode f,
+                          int benchmark_iterations,
+                          int disable_cpu_flags,
+                          int benchmark_cpu_info) {
+  if (!SizeValid(src_width, src_height, dst_width, dst_height)) {
+    return 0;
+  }
+
+  int i, j;
+  int src_width_uv = Abs(src_width);
+  int src_height_uv = Abs(src_height);
+
+  int64_t src_y_plane_size = (Abs(src_width)) * (Abs(src_height));
+  int64_t src_uv_plane_size = (src_width_uv) * (src_height_uv);
+
+  int src_stride_y = Abs(src_width);
+  int src_stride_uv = src_width_uv;
+
+  align_buffer_page_end(src_y, src_y_plane_size);
+  align_buffer_page_end(src_u, src_uv_plane_size);
+  align_buffer_page_end(src_v, src_uv_plane_size);
+  if (!src_y || !src_u || !src_v) {
+    printf("Skipped.  Alloc failed " FILELINESTR(__FILE__, __LINE__) "\n");
+    return 0;
+  }
+  MemRandomize(src_y, src_y_plane_size);
+  MemRandomize(src_u, src_uv_plane_size);
+  MemRandomize(src_v, src_uv_plane_size);
+
+  int dst_width_uv = dst_width;
+  int dst_height_uv = dst_height;
+
+  int64_t dst_y_plane_size = (dst_width) * (dst_height);
+  int64_t dst_uv_plane_size = (dst_width_uv) * (dst_height_uv);
+
+  int dst_stride_y = dst_width;
+  int dst_stride_uv = dst_width_uv;
+
+  align_buffer_page_end(dst_y_c, dst_y_plane_size);
+  align_buffer_page_end(dst_u_c, dst_uv_plane_size);
+  align_buffer_page_end(dst_v_c, dst_uv_plane_size);
+  align_buffer_page_end(dst_y_opt, dst_y_plane_size);
+  align_buffer_page_end(dst_u_opt, dst_uv_plane_size);
+  align_buffer_page_end(dst_v_opt, dst_uv_plane_size);
+  if (!dst_y_c || !dst_u_c || !dst_v_c || !dst_y_opt || !dst_u_opt ||
+      !dst_v_opt) {
+    printf("Skipped.  Alloc failed " FILELINESTR(__FILE__, __LINE__) "\n");
+    return 0;
+  }
+
+  MaskCpuFlags(disable_cpu_flags);  // Disable all CPU optimization.
+  double c_time = get_time();
+  I444Scale(src_y, src_stride_y, src_u, src_stride_uv, src_v, src_stride_uv,
+            src_width, src_height, dst_y_c, dst_stride_y, dst_u_c,
+            dst_stride_uv, dst_v_c, dst_stride_uv, dst_width, dst_height, f);
+  c_time = (get_time() - c_time);
+
+  MaskCpuFlags(benchmark_cpu_info);  // Enable all CPU optimization.
+  double opt_time = get_time();
+  for (i = 0; i < benchmark_iterations; ++i) {
+    I444Scale(src_y, src_stride_y, src_u, src_stride_uv, src_v, src_stride_uv,
+              src_width, src_height, dst_y_opt, dst_stride_y, dst_u_opt,
+              dst_stride_uv, dst_v_opt, dst_stride_uv, dst_width, dst_height,
+              f);
+  }
+  opt_time = (get_time() - opt_time) / benchmark_iterations;
+  // Report performance of C vs OPT.
+  printf("filter %d - %8d us C - %8d us OPT\n", f,
+         static_cast<int>(c_time * 1e6), static_cast<int>(opt_time * 1e6));
+
+  // C version may be a little off from the optimized. Order of
+  //  operations may introduce rounding somewhere. So do a difference
+  //  of the buffers and look to see that the max difference is not
+  //  over 3.
+  int max_diff = 0;
+  for (i = 0; i < (dst_height); ++i) {
+    for (j = 0; j < (dst_width); ++j) {
+      int abs_diff = Abs(dst_y_c[(i * dst_stride_y) + j] -
+                         dst_y_opt[(i * dst_stride_y) + j]);
+      if (abs_diff > max_diff) {
+        max_diff = abs_diff;
+      }
+    }
+  }
+
+  for (i = 0; i < (dst_height_uv); ++i) {
+    for (j = 0; j < (dst_width_uv); ++j) {
+      int abs_diff = Abs(dst_u_c[(i * dst_stride_uv) + j] -
+                         dst_u_opt[(i * dst_stride_uv) + j]);
+      if (abs_diff > max_diff) {
+        max_diff = abs_diff;
+      }
+      abs_diff = Abs(dst_v_c[(i * dst_stride_uv) + j] -
+                     dst_v_opt[(i * dst_stride_uv) + j]);
+      if (abs_diff > max_diff) {
+        max_diff = abs_diff;
+      }
+    }
+  }
+
+  free_aligned_buffer_page_end(dst_y_c);
+  free_aligned_buffer_page_end(dst_u_c);
+  free_aligned_buffer_page_end(dst_v_c);
+  free_aligned_buffer_page_end(dst_y_opt);
+  free_aligned_buffer_page_end(dst_u_opt);
+  free_aligned_buffer_page_end(dst_v_opt);
+  free_aligned_buffer_page_end(src_y);
+  free_aligned_buffer_page_end(src_u);
+  free_aligned_buffer_page_end(src_v);
+
+  return max_diff;
+}
+
+// Test scaling with 8 bit C vs 16 bit C and return maximum pixel difference.
+// 0 = exact.
+static int I444TestFilter_16(int src_width,
+                             int src_height,
+                             int dst_width,
+                             int dst_height,
+                             FilterMode f,
+                             int benchmark_iterations,
+                             int disable_cpu_flags,
+                             int benchmark_cpu_info) {
+  if (!SizeValid(src_width, src_height, dst_width, dst_height)) {
+    return 0;
+  }
+
+  int i;
+  int src_width_uv = Abs(src_width);
+  int src_height_uv = Abs(src_height);
+
+  int64_t src_y_plane_size = (Abs(src_width)) * (Abs(src_height));
+  int64_t src_uv_plane_size = (src_width_uv) * (src_height_uv);
+
+  int src_stride_y = Abs(src_width);
+  int src_stride_uv = src_width_uv;
+
+  align_buffer_page_end(src_y, src_y_plane_size);
+  align_buffer_page_end(src_u, src_uv_plane_size);
+  align_buffer_page_end(src_v, src_uv_plane_size);
+  align_buffer_page_end(src_y_16, src_y_plane_size * 2);
+  align_buffer_page_end(src_u_16, src_uv_plane_size * 2);
+  align_buffer_page_end(src_v_16, src_uv_plane_size * 2);
+  if (!src_y || !src_u || !src_v || !src_y_16 || !src_u_16 || !src_v_16) {
+    printf("Skipped.  Alloc failed " FILELINESTR(__FILE__, __LINE__) "\n");
+    return 0;
+  }
+  uint16_t* p_src_y_16 = reinterpret_cast<uint16_t*>(src_y_16);
+  uint16_t* p_src_u_16 = reinterpret_cast<uint16_t*>(src_u_16);
+  uint16_t* p_src_v_16 = reinterpret_cast<uint16_t*>(src_v_16);
+
+  MemRandomize(src_y, src_y_plane_size);
+  MemRandomize(src_u, src_uv_plane_size);
+  MemRandomize(src_v, src_uv_plane_size);
+
+  for (i = 0; i < src_y_plane_size; ++i) {
+    p_src_y_16[i] = src_y[i];
+  }
+  for (i = 0; i < src_uv_plane_size; ++i) {
+    p_src_u_16[i] = src_u[i];
+    p_src_v_16[i] = src_v[i];
+  }
+
+  int dst_width_uv = dst_width;
+  int dst_height_uv = dst_height;
+
+  int dst_y_plane_size = (dst_width) * (dst_height);
+  int dst_uv_plane_size = (dst_width_uv) * (dst_height_uv);
+
+  int dst_stride_y = dst_width;
+  int dst_stride_uv = dst_width_uv;
+
+  align_buffer_page_end(dst_y_8, dst_y_plane_size);
+  align_buffer_page_end(dst_u_8, dst_uv_plane_size);
+  align_buffer_page_end(dst_v_8, dst_uv_plane_size);
+  align_buffer_page_end(dst_y_16, dst_y_plane_size * 2);
+  align_buffer_page_end(dst_u_16, dst_uv_plane_size * 2);
+  align_buffer_page_end(dst_v_16, dst_uv_plane_size * 2);
+
+  uint16_t* p_dst_y_16 = reinterpret_cast<uint16_t*>(dst_y_16);
+  uint16_t* p_dst_u_16 = reinterpret_cast<uint16_t*>(dst_u_16);
+  uint16_t* p_dst_v_16 = reinterpret_cast<uint16_t*>(dst_v_16);
+
+  MaskCpuFlags(disable_cpu_flags);  // Disable all CPU optimization.
+  I444Scale(src_y, src_stride_y, src_u, src_stride_uv, src_v, src_stride_uv,
+            src_width, src_height, dst_y_8, dst_stride_y, dst_u_8,
+            dst_stride_uv, dst_v_8, dst_stride_uv, dst_width, dst_height, f);
+  MaskCpuFlags(benchmark_cpu_info);  // Enable all CPU optimization.
+  for (i = 0; i < benchmark_iterations; ++i) {
+    I444Scale_16(p_src_y_16, src_stride_y, p_src_u_16, src_stride_uv,
+                 p_src_v_16, src_stride_uv, src_width, src_height, p_dst_y_16,
+                 dst_stride_y, p_dst_u_16, dst_stride_uv, p_dst_v_16,
+                 dst_stride_uv, dst_width, dst_height, f);
+  }
+
+  // Expect an exact match.
+  int max_diff = 0;
+  for (i = 0; i < dst_y_plane_size; ++i) {
+    int abs_diff = Abs(dst_y_8[i] - p_dst_y_16[i]);
+    if (abs_diff > max_diff) {
+      max_diff = abs_diff;
+    }
+  }
+  for (i = 0; i < dst_uv_plane_size; ++i) {
+    int abs_diff = Abs(dst_u_8[i] - p_dst_u_16[i]);
+    if (abs_diff > max_diff) {
+      max_diff = abs_diff;
+    }
+    abs_diff = Abs(dst_v_8[i] - p_dst_v_16[i]);
+    if (abs_diff > max_diff) {
+      max_diff = abs_diff;
+    }
+  }
+
+  free_aligned_buffer_page_end(dst_y_8);
+  free_aligned_buffer_page_end(dst_u_8);
+  free_aligned_buffer_page_end(dst_v_8);
+  free_aligned_buffer_page_end(dst_y_16);
+  free_aligned_buffer_page_end(dst_u_16);
+  free_aligned_buffer_page_end(dst_v_16);
+  free_aligned_buffer_page_end(src_y);
+  free_aligned_buffer_page_end(src_u);
+  free_aligned_buffer_page_end(src_v);
+  free_aligned_buffer_page_end(src_y_16);
+  free_aligned_buffer_page_end(src_u_16);
+  free_aligned_buffer_page_end(src_v_16);
+
+  return max_diff;
+}
+
 // The following adjustments in dimensions ensure the scale factor will be
 // exactly achieved.
 // 2 is chroma subsample.
@@ -263,16 +498,32 @@ static int TestFilter_16(int src_width,
 #define SX(x, nom, denom) static_cast<int>(((x / nom + 1) / 2) * denom * 2)
 
 #define TEST_FACTOR1(name, filter, nom, denom, max_diff)                     \
-  TEST_F(LibYUVScaleTest, ScaleDownBy##name##_##filter) {                    \
-    int diff = TestFilter(                                                   \
+  TEST_F(LibYUVScaleTest, I420ScaleDownBy##name##_##filter) {                \
+    int diff = I420TestFilter(                                               \
+        SX(benchmark_width_, nom, denom), SX(benchmark_height_, nom, denom), \
+        DX(benchmark_width_, nom, denom), DX(benchmark_height_, nom, denom), \
+        kFilter##filter, benchmark_iterations_, disable_cpu_flags_,          \
+        benchmark_cpu_info_);                                                \
+    EXPECT_LE(diff, max_diff);                                               \
+  }                                                                          \
+  TEST_F(LibYUVScaleTest, I444ScaleDownBy##name##_##filter) {                \
+    int diff = I444TestFilter(                                               \
         SX(benchmark_width_, nom, denom), SX(benchmark_height_, nom, denom), \
         DX(benchmark_width_, nom, denom), DX(benchmark_height_, nom, denom), \
         kFilter##filter, benchmark_iterations_, disable_cpu_flags_,          \
         benchmark_cpu_info_);                                                \
     EXPECT_LE(diff, max_diff);                                               \
   }                                                                          \
-  TEST_F(LibYUVScaleTest, ScaleDownBy##name##_##filter##_16) {               \
-    int diff = TestFilter_16(                                                \
+  TEST_F(LibYUVScaleTest, I420ScaleDownBy##name##_##filter##_16) {           \
+    int diff = I420TestFilter_16(                                            \
+        SX(benchmark_width_, nom, denom), SX(benchmark_height_, nom, denom), \
+        DX(benchmark_width_, nom, denom), DX(benchmark_height_, nom, denom), \
+        kFilter##filter, benchmark_iterations_, disable_cpu_flags_,          \
+        benchmark_cpu_info_);                                                \
+    EXPECT_LE(diff, max_diff);                                               \
+  }                                                                          \
+  TEST_F(LibYUVScaleTest, I444ScaleDownBy##name##_##filter##_16) {           \
+    int diff = I444TestFilter_16(                                            \
         SX(benchmark_width_, nom, denom), SX(benchmark_height_, nom, denom), \
         DX(benchmark_width_, nom, denom), DX(benchmark_height_, nom, denom), \
         kFilter##filter, benchmark_iterations_, disable_cpu_flags_,          \
@@ -300,30 +551,58 @@ TEST_FACTOR(3, 1, 3, 0)
 #undef DX
 
 #define TEST_SCALETO1(name, width, height, filter, max_diff)                  \
-  TEST_F(LibYUVScaleTest, name##To##width##x##height##_##filter) {            \
-    int diff = TestFilter(benchmark_width_, benchmark_height_, width, height, \
-                          kFilter##filter, benchmark_iterations_,             \
-                          disable_cpu_flags_, benchmark_cpu_info_);           \
+  TEST_F(LibYUVScaleTest, I420##name##To##width##x##height##_##filter) {      \
+    int diff = I420TestFilter(benchmark_width_, benchmark_height_, width,     \
+                              height, kFilter##filter, benchmark_iterations_, \
+                              disable_cpu_flags_, benchmark_cpu_info_);       \
+    EXPECT_LE(diff, max_diff);                                                \
+  }                                                                           \
+  TEST_F(LibYUVScaleTest, I444##name##To##width##x##height##_##filter) {      \
+    int diff = I444TestFilter(benchmark_width_, benchmark_height_, width,     \
+                              height, kFilter##filter, benchmark_iterations_, \
+                              disable_cpu_flags_, benchmark_cpu_info_);       \
+    EXPECT_LE(diff, max_diff);                                                \
+  }                                                                           \
+  TEST_F(LibYUVScaleTest, I420##name##To##width##x##height##_##filter##_16) { \
+    int diff = I420TestFilter_16(                                             \
+        benchmark_width_, benchmark_height_, width, height, kFilter##filter,  \
+        benchmark_iterations_, disable_cpu_flags_, benchmark_cpu_info_);      \
+    EXPECT_LE(diff, max_diff);                                                \
+  }                                                                           \
+  TEST_F(LibYUVScaleTest, I444##name##To##width##x##height##_##filter##_16) { \
+    int diff = I444TestFilter_16(                                             \
+        benchmark_width_, benchmark_height_, width, height, kFilter##filter,  \
+        benchmark_iterations_, disable_cpu_flags_, benchmark_cpu_info_);      \
+    EXPECT_LE(diff, max_diff);                                                \
+  }                                                                           \
+  TEST_F(LibYUVScaleTest, I420##name##From##width##x##height##_##filter) {    \
+    int diff = I420TestFilter(width, height, Abs(benchmark_width_),           \
+                              Abs(benchmark_height_), kFilter##filter,        \
+                              benchmark_iterations_, disable_cpu_flags_,      \
+                              benchmark_cpu_info_);                           \
     EXPECT_LE(diff, max_diff);                                                \
   }                                                                           \
-  TEST_F(LibYUVScaleTest, name##From##width##x##height##_##filter) {          \
-    int diff = TestFilter(width, height, Abs(benchmark_width_),               \
-                          Abs(benchmark_height_), kFilter##filter,            \
-                          benchmark_iterations_, disable_cpu_flags_,          \
-                          benchmark_cpu_info_);                               \
+  TEST_F(LibYUVScaleTest, I444##name##From##width##x##height##_##filter) {    \
+    int diff = I444TestFilter(width, height, Abs(benchmark_width_),           \
+                              Abs(benchmark_height_), kFilter##filter,        \
+                              benchmark_iterations_, disable_cpu_flags_,      \
+                              benchmark_cpu_info_);                           \
     EXPECT_LE(diff, max_diff);                                                \
   }                                                                           \
-  TEST_F(LibYUVScaleTest, name##To##width##x##height##_##filter##_16) {       \
-    int diff = TestFilter_16(benchmark_width_, benchmark_height_, width,      \
-                             height, kFilter##filter, benchmark_iterations_,  \
-                             disable_cpu_flags_, benchmark_cpu_info_);        \
+  TEST_F(LibYUVScaleTest,                                                     \
+         I420##name##From##width##x##height##_##filter##_16) {                \
+    int diff = I420TestFilter_16(width, height, Abs(benchmark_width_),        \
+                                 Abs(benchmark_height_), kFilter##filter,     \
+                                 benchmark_iterations_, disable_cpu_flags_,   \
+                                 benchmark_cpu_info_);                        \
     EXPECT_LE(diff, max_diff);                                                \
   }                                                                           \
-  TEST_F(LibYUVScaleTest, name##From##width##x##height##_##filter##_16) {     \
-    int diff = TestFilter_16(width, height, Abs(benchmark_width_),            \
-                             Abs(benchmark_height_), kFilter##filter,         \
-                             benchmark_iterations_, disable_cpu_flags_,       \
-                             benchmark_cpu_info_);                            \
+  TEST_F(LibYUVScaleTest,                                                     \
+         I444##name##From##width##x##height##_##filter##_16) {                \
+    int diff = I444TestFilter_16(width, height, Abs(benchmark_width_),        \
+                                 Abs(benchmark_height_), kFilter##filter,     \
+                                 benchmark_iterations_, disable_cpu_flags_,   \
+                                 benchmark_cpu_info_);                        \
     EXPECT_LE(diff, max_diff);                                                \
   }