Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1323 insertions, 0 deletions

diff --git a/media/libvpx/libvpx/third_party/libyuv/source/scale_common.cc b/media/libvpx/libvpx/third_party/libyuv/source/scale_common.cc
new file mode 100644
index 0000000000..b28d7da41f
--- /dev/null
+++ b/media/libvpx/libvpx/third_party/libyuv/source/scale_common.cc
@@ -0,0 +1,1323 @@
+/*
+ *  Copyright 2013 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.
+ */
+
+#include "libyuv/scale.h"
+
+#include <assert.h>
+#include <string.h>
+
+#include "libyuv/cpu_id.h"
+#include "libyuv/planar_functions.h"  // For CopyARGB
+#include "libyuv/row.h"
+#include "libyuv/scale_row.h"
+
+#ifdef __cplusplus
+namespace libyuv {
+extern "C" {
+#endif
+
+static __inline int Abs(int v) {
+  return v >= 0 ? v : -v;
+}
+
+// CPU agnostic row functions
+void ScaleRowDown2_C(const uint8_t* src_ptr,
+                     ptrdiff_t src_stride,
+                     uint8_t* dst,
+                     int dst_width) {
+  int x;
+  (void)src_stride;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = src_ptr[1];
+    dst[1] = src_ptr[3];
+    dst += 2;
+    src_ptr += 4;
+  }
+  if (dst_width & 1) {
+    dst[0] = src_ptr[1];
+  }
+}
+
+void ScaleRowDown2_16_C(const uint16_t* src_ptr,
+                        ptrdiff_t src_stride,
+                        uint16_t* dst,
+                        int dst_width) {
+  int x;
+  (void)src_stride;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = src_ptr[1];
+    dst[1] = src_ptr[3];
+    dst += 2;
+    src_ptr += 4;
+  }
+  if (dst_width & 1) {
+    dst[0] = src_ptr[1];
+  }
+}
+
+void ScaleRowDown2Linear_C(const uint8_t* src_ptr,
+                           ptrdiff_t src_stride,
+                           uint8_t* dst,
+                           int dst_width) {
+  const uint8_t* s = src_ptr;
+  int x;
+  (void)src_stride;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = (s[0] + s[1] + 1) >> 1;
+    dst[1] = (s[2] + s[3] + 1) >> 1;
+    dst += 2;
+    s += 4;
+  }
+  if (dst_width & 1) {
+    dst[0] = (s[0] + s[1] + 1) >> 1;
+  }
+}
+
+void ScaleRowDown2Linear_16_C(const uint16_t* src_ptr,
+                              ptrdiff_t src_stride,
+                              uint16_t* dst,
+                              int dst_width) {
+  const uint16_t* s = src_ptr;
+  int x;
+  (void)src_stride;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = (s[0] + s[1] + 1) >> 1;
+    dst[1] = (s[2] + s[3] + 1) >> 1;
+    dst += 2;
+    s += 4;
+  }
+  if (dst_width & 1) {
+    dst[0] = (s[0] + s[1] + 1) >> 1;
+  }
+}
+
+void ScaleRowDown2Box_C(const uint8_t* src_ptr,
+                        ptrdiff_t src_stride,
+                        uint8_t* dst,
+                        int dst_width) {
+  const uint8_t* s = src_ptr;
+  const uint8_t* t = src_ptr + src_stride;
+  int x;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2;
+    dst[1] = (s[2] + s[3] + t[2] + t[3] + 2) >> 2;
+    dst += 2;
+    s += 4;
+    t += 4;
+  }
+  if (dst_width & 1) {
+    dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2;
+  }
+}
+
+void ScaleRowDown2Box_Odd_C(const uint8_t* src_ptr,
+                            ptrdiff_t src_stride,
+                            uint8_t* dst,
+                            int dst_width) {
+  const uint8_t* s = src_ptr;
+  const uint8_t* t = src_ptr + src_stride;
+  int x;
+  dst_width -= 1;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2;
+    dst[1] = (s[2] + s[3] + t[2] + t[3] + 2) >> 2;
+    dst += 2;
+    s += 4;
+    t += 4;
+  }
+  if (dst_width & 1) {
+    dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2;
+    dst += 1;
+    s += 2;
+    t += 2;
+  }
+  dst[0] = (s[0] + t[0] + 1) >> 1;
+}
+
+void ScaleRowDown2Box_16_C(const uint16_t* src_ptr,
+                           ptrdiff_t src_stride,
+                           uint16_t* dst,
+                           int dst_width) {
+  const uint16_t* s = src_ptr;
+  const uint16_t* t = src_ptr + src_stride;
+  int x;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2;
+    dst[1] = (s[2] + s[3] + t[2] + t[3] + 2) >> 2;
+    dst += 2;
+    s += 4;
+    t += 4;
+  }
+  if (dst_width & 1) {
+    dst[0] = (s[0] + s[1] + t[0] + t[1] + 2) >> 2;
+  }
+}
+
+void ScaleRowDown4_C(const uint8_t* src_ptr,
+                     ptrdiff_t src_stride,
+                     uint8_t* dst,
+                     int dst_width) {
+  int x;
+  (void)src_stride;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = src_ptr[2];
+    dst[1] = src_ptr[6];
+    dst += 2;
+    src_ptr += 8;
+  }
+  if (dst_width & 1) {
+    dst[0] = src_ptr[2];
+  }
+}
+
+void ScaleRowDown4_16_C(const uint16_t* src_ptr,
+                        ptrdiff_t src_stride,
+                        uint16_t* dst,
+                        int dst_width) {
+  int x;
+  (void)src_stride;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = src_ptr[2];
+    dst[1] = src_ptr[6];
+    dst += 2;
+    src_ptr += 8;
+  }
+  if (dst_width & 1) {
+    dst[0] = src_ptr[2];
+  }
+}
+
+void ScaleRowDown4Box_C(const uint8_t* src_ptr,
+                        ptrdiff_t src_stride,
+                        uint8_t* dst,
+                        int dst_width) {
+  intptr_t stride = src_stride;
+  int x;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] +
+              src_ptr[stride + 0] + src_ptr[stride + 1] + src_ptr[stride + 2] +
+              src_ptr[stride + 3] + src_ptr[stride * 2 + 0] +
+              src_ptr[stride * 2 + 1] + src_ptr[stride * 2 + 2] +
+              src_ptr[stride * 2 + 3] + src_ptr[stride * 3 + 0] +
+              src_ptr[stride * 3 + 1] + src_ptr[stride * 3 + 2] +
+              src_ptr[stride * 3 + 3] + 8) >>
+             4;
+    dst[1] = (src_ptr[4] + src_ptr[5] + src_ptr[6] + src_ptr[7] +
+              src_ptr[stride + 4] + src_ptr[stride + 5] + src_ptr[stride + 6] +
+              src_ptr[stride + 7] + src_ptr[stride * 2 + 4] +
+              src_ptr[stride * 2 + 5] + src_ptr[stride * 2 + 6] +
+              src_ptr[stride * 2 + 7] + src_ptr[stride * 3 + 4] +
+              src_ptr[stride * 3 + 5] + src_ptr[stride * 3 + 6] +
+              src_ptr[stride * 3 + 7] + 8) >>
+             4;
+    dst += 2;
+    src_ptr += 8;
+  }
+  if (dst_width & 1) {
+    dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] +
+              src_ptr[stride + 0] + src_ptr[stride + 1] + src_ptr[stride + 2] +
+              src_ptr[stride + 3] + src_ptr[stride * 2 + 0] +
+              src_ptr[stride * 2 + 1] + src_ptr[stride * 2 + 2] +
+              src_ptr[stride * 2 + 3] + src_ptr[stride * 3 + 0] +
+              src_ptr[stride * 3 + 1] + src_ptr[stride * 3 + 2] +
+              src_ptr[stride * 3 + 3] + 8) >>
+             4;
+  }
+}
+
+void ScaleRowDown4Box_16_C(const uint16_t* src_ptr,
+                           ptrdiff_t src_stride,
+                           uint16_t* dst,
+                           int dst_width) {
+  intptr_t stride = src_stride;
+  int x;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] +
+              src_ptr[stride + 0] + src_ptr[stride + 1] + src_ptr[stride + 2] +
+              src_ptr[stride + 3] + src_ptr[stride * 2 + 0] +
+              src_ptr[stride * 2 + 1] + src_ptr[stride * 2 + 2] +
+              src_ptr[stride * 2 + 3] + src_ptr[stride * 3 + 0] +
+              src_ptr[stride * 3 + 1] + src_ptr[stride * 3 + 2] +
+              src_ptr[stride * 3 + 3] + 8) >>
+             4;
+    dst[1] = (src_ptr[4] + src_ptr[5] + src_ptr[6] + src_ptr[7] +
+              src_ptr[stride + 4] + src_ptr[stride + 5] + src_ptr[stride + 6] +
+              src_ptr[stride + 7] + src_ptr[stride * 2 + 4] +
+              src_ptr[stride * 2 + 5] + src_ptr[stride * 2 + 6] +
+              src_ptr[stride * 2 + 7] + src_ptr[stride * 3 + 4] +
+              src_ptr[stride * 3 + 5] + src_ptr[stride * 3 + 6] +
+              src_ptr[stride * 3 + 7] + 8) >>
+             4;
+    dst += 2;
+    src_ptr += 8;
+  }
+  if (dst_width & 1) {
+    dst[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[3] +
+              src_ptr[stride + 0] + src_ptr[stride + 1] + src_ptr[stride + 2] +
+              src_ptr[stride + 3] + src_ptr[stride * 2 + 0] +
+              src_ptr[stride * 2 + 1] + src_ptr[stride * 2 + 2] +
+              src_ptr[stride * 2 + 3] + src_ptr[stride * 3 + 0] +
+              src_ptr[stride * 3 + 1] + src_ptr[stride * 3 + 2] +
+              src_ptr[stride * 3 + 3] + 8) >>
+             4;
+  }
+}
+
+void ScaleRowDown34_C(const uint8_t* src_ptr,
+                      ptrdiff_t src_stride,
+                      uint8_t* dst,
+                      int dst_width) {
+  int x;
+  (void)src_stride;
+  assert((dst_width % 3 == 0) && (dst_width > 0));
+  for (x = 0; x < dst_width; x += 3) {
+    dst[0] = src_ptr[0];
+    dst[1] = src_ptr[1];
+    dst[2] = src_ptr[3];
+    dst += 3;
+    src_ptr += 4;
+  }
+}
+
+void ScaleRowDown34_16_C(const uint16_t* src_ptr,
+                         ptrdiff_t src_stride,
+                         uint16_t* dst,
+                         int dst_width) {
+  int x;
+  (void)src_stride;
+  assert((dst_width % 3 == 0) && (dst_width > 0));
+  for (x = 0; x < dst_width; x += 3) {
+    dst[0] = src_ptr[0];
+    dst[1] = src_ptr[1];
+    dst[2] = src_ptr[3];
+    dst += 3;
+    src_ptr += 4;
+  }
+}
+
+// Filter rows 0 and 1 together, 3 : 1
+void ScaleRowDown34_0_Box_C(const uint8_t* src_ptr,
+                            ptrdiff_t src_stride,
+                            uint8_t* d,
+                            int dst_width) {
+  const uint8_t* s = src_ptr;
+  const uint8_t* t = src_ptr + src_stride;
+  int x;
+  assert((dst_width % 3 == 0) && (dst_width > 0));
+  for (x = 0; x < dst_width; x += 3) {
+    uint8_t a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2;
+    uint8_t a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1;
+    uint8_t a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2;
+    uint8_t b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2;
+    uint8_t b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1;
+    uint8_t b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2;
+    d[0] = (a0 * 3 + b0 + 2) >> 2;
+    d[1] = (a1 * 3 + b1 + 2) >> 2;
+    d[2] = (a2 * 3 + b2 + 2) >> 2;
+    d += 3;
+    s += 4;
+    t += 4;
+  }
+}
+
+void ScaleRowDown34_0_Box_16_C(const uint16_t* src_ptr,
+                               ptrdiff_t src_stride,
+                               uint16_t* d,
+                               int dst_width) {
+  const uint16_t* s = src_ptr;
+  const uint16_t* t = src_ptr + src_stride;
+  int x;
+  assert((dst_width % 3 == 0) && (dst_width > 0));
+  for (x = 0; x < dst_width; x += 3) {
+    uint16_t a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2;
+    uint16_t a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1;
+    uint16_t a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2;
+    uint16_t b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2;
+    uint16_t b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1;
+    uint16_t b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2;
+    d[0] = (a0 * 3 + b0 + 2) >> 2;
+    d[1] = (a1 * 3 + b1 + 2) >> 2;
+    d[2] = (a2 * 3 + b2 + 2) >> 2;
+    d += 3;
+    s += 4;
+    t += 4;
+  }
+}
+
+// Filter rows 1 and 2 together, 1 : 1
+void ScaleRowDown34_1_Box_C(const uint8_t* src_ptr,
+                            ptrdiff_t src_stride,
+                            uint8_t* d,
+                            int dst_width) {
+  const uint8_t* s = src_ptr;
+  const uint8_t* t = src_ptr + src_stride;
+  int x;
+  assert((dst_width % 3 == 0) && (dst_width > 0));
+  for (x = 0; x < dst_width; x += 3) {
+    uint8_t a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2;
+    uint8_t a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1;
+    uint8_t a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2;
+    uint8_t b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2;
+    uint8_t b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1;
+    uint8_t b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2;
+    d[0] = (a0 + b0 + 1) >> 1;
+    d[1] = (a1 + b1 + 1) >> 1;
+    d[2] = (a2 + b2 + 1) >> 1;
+    d += 3;
+    s += 4;
+    t += 4;
+  }
+}
+
+void ScaleRowDown34_1_Box_16_C(const uint16_t* src_ptr,
+                               ptrdiff_t src_stride,
+                               uint16_t* d,
+                               int dst_width) {
+  const uint16_t* s = src_ptr;
+  const uint16_t* t = src_ptr + src_stride;
+  int x;
+  assert((dst_width % 3 == 0) && (dst_width > 0));
+  for (x = 0; x < dst_width; x += 3) {
+    uint16_t a0 = (s[0] * 3 + s[1] * 1 + 2) >> 2;
+    uint16_t a1 = (s[1] * 1 + s[2] * 1 + 1) >> 1;
+    uint16_t a2 = (s[2] * 1 + s[3] * 3 + 2) >> 2;
+    uint16_t b0 = (t[0] * 3 + t[1] * 1 + 2) >> 2;
+    uint16_t b1 = (t[1] * 1 + t[2] * 1 + 1) >> 1;
+    uint16_t b2 = (t[2] * 1 + t[3] * 3 + 2) >> 2;
+    d[0] = (a0 + b0 + 1) >> 1;
+    d[1] = (a1 + b1 + 1) >> 1;
+    d[2] = (a2 + b2 + 1) >> 1;
+    d += 3;
+    s += 4;
+    t += 4;
+  }
+}
+
+// Scales a single row of pixels using point sampling.
+void ScaleCols_C(uint8_t* dst_ptr,
+                 const uint8_t* src_ptr,
+                 int dst_width,
+                 int x,
+                 int dx) {
+  int j;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    dst_ptr[0] = src_ptr[x >> 16];
+    x += dx;
+    dst_ptr[1] = src_ptr[x >> 16];
+    x += dx;
+    dst_ptr += 2;
+  }
+  if (dst_width & 1) {
+    dst_ptr[0] = src_ptr[x >> 16];
+  }
+}
+
+void ScaleCols_16_C(uint16_t* dst_ptr,
+                    const uint16_t* src_ptr,
+                    int dst_width,
+                    int x,
+                    int dx) {
+  int j;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    dst_ptr[0] = src_ptr[x >> 16];
+    x += dx;
+    dst_ptr[1] = src_ptr[x >> 16];
+    x += dx;
+    dst_ptr += 2;
+  }
+  if (dst_width & 1) {
+    dst_ptr[0] = src_ptr[x >> 16];
+  }
+}
+
+// Scales a single row of pixels up by 2x using point sampling.
+void ScaleColsUp2_C(uint8_t* dst_ptr,
+                    const uint8_t* src_ptr,
+                    int dst_width,
+                    int x,
+                    int dx) {
+  int j;
+  (void)x;
+  (void)dx;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    dst_ptr[1] = dst_ptr[0] = src_ptr[0];
+    src_ptr += 1;
+    dst_ptr += 2;
+  }
+  if (dst_width & 1) {
+    dst_ptr[0] = src_ptr[0];
+  }
+}
+
+void ScaleColsUp2_16_C(uint16_t* dst_ptr,
+                       const uint16_t* src_ptr,
+                       int dst_width,
+                       int x,
+                       int dx) {
+  int j;
+  (void)x;
+  (void)dx;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    dst_ptr[1] = dst_ptr[0] = src_ptr[0];
+    src_ptr += 1;
+    dst_ptr += 2;
+  }
+  if (dst_width & 1) {
+    dst_ptr[0] = src_ptr[0];
+  }
+}
+
+// (1-f)a + fb can be replaced with a + f(b-a)
+#if defined(__arm__) || defined(__aarch64__)
+#define BLENDER(a, b, f) \
+  (uint8_t)((int)(a) + ((((int)((f)) * ((int)(b) - (int)(a))) + 0x8000) >> 16))
+#else
+// Intel uses 7 bit math with rounding.
+#define BLENDER(a, b, f) \
+  (uint8_t)((int)(a) + (((int)((f) >> 9) * ((int)(b) - (int)(a)) + 0x40) >> 7))
+#endif
+
+void ScaleFilterCols_C(uint8_t* dst_ptr,
+                       const uint8_t* src_ptr,
+                       int dst_width,
+                       int x,
+                       int dx) {
+  int j;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    int xi = x >> 16;
+    int a = src_ptr[xi];
+    int b = src_ptr[xi + 1];
+    dst_ptr[0] = BLENDER(a, b, x & 0xffff);
+    x += dx;
+    xi = x >> 16;
+    a = src_ptr[xi];
+    b = src_ptr[xi + 1];
+    dst_ptr[1] = BLENDER(a, b, x & 0xffff);
+    x += dx;
+    dst_ptr += 2;
+  }
+  if (dst_width & 1) {
+    int xi = x >> 16;
+    int a = src_ptr[xi];
+    int b = src_ptr[xi + 1];
+    dst_ptr[0] = BLENDER(a, b, x & 0xffff);
+  }
+}
+
+void ScaleFilterCols64_C(uint8_t* dst_ptr,
+                         const uint8_t* src_ptr,
+                         int dst_width,
+                         int x32,
+                         int dx) {
+  int64_t x = (int64_t)(x32);
+  int j;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    int64_t xi = x >> 16;
+    int a = src_ptr[xi];
+    int b = src_ptr[xi + 1];
+    dst_ptr[0] = BLENDER(a, b, x & 0xffff);
+    x += dx;
+    xi = x >> 16;
+    a = src_ptr[xi];
+    b = src_ptr[xi + 1];
+    dst_ptr[1] = BLENDER(a, b, x & 0xffff);
+    x += dx;
+    dst_ptr += 2;
+  }
+  if (dst_width & 1) {
+    int64_t xi = x >> 16;
+    int a = src_ptr[xi];
+    int b = src_ptr[xi + 1];
+    dst_ptr[0] = BLENDER(a, b, x & 0xffff);
+  }
+}
+#undef BLENDER
+
+// Same as 8 bit arm blender but return is cast to uint16_t
+#define BLENDER(a, b, f) \
+  (uint16_t)((int)(a) + ((((int)((f)) * ((int)(b) - (int)(a))) + 0x8000) >> 16))
+
+void ScaleFilterCols_16_C(uint16_t* dst_ptr,
+                          const uint16_t* src_ptr,
+                          int dst_width,
+                          int x,
+                          int dx) {
+  int j;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    int xi = x >> 16;
+    int a = src_ptr[xi];
+    int b = src_ptr[xi + 1];
+    dst_ptr[0] = BLENDER(a, b, x & 0xffff);
+    x += dx;
+    xi = x >> 16;
+    a = src_ptr[xi];
+    b = src_ptr[xi + 1];
+    dst_ptr[1] = BLENDER(a, b, x & 0xffff);
+    x += dx;
+    dst_ptr += 2;
+  }
+  if (dst_width & 1) {
+    int xi = x >> 16;
+    int a = src_ptr[xi];
+    int b = src_ptr[xi + 1];
+    dst_ptr[0] = BLENDER(a, b, x & 0xffff);
+  }
+}
+
+void ScaleFilterCols64_16_C(uint16_t* dst_ptr,
+                            const uint16_t* src_ptr,
+                            int dst_width,
+                            int x32,
+                            int dx) {
+  int64_t x = (int64_t)(x32);
+  int j;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    int64_t xi = x >> 16;
+    int a = src_ptr[xi];
+    int b = src_ptr[xi + 1];
+    dst_ptr[0] = BLENDER(a, b, x & 0xffff);
+    x += dx;
+    xi = x >> 16;
+    a = src_ptr[xi];
+    b = src_ptr[xi + 1];
+    dst_ptr[1] = BLENDER(a, b, x & 0xffff);
+    x += dx;
+    dst_ptr += 2;
+  }
+  if (dst_width & 1) {
+    int64_t xi = x >> 16;
+    int a = src_ptr[xi];
+    int b = src_ptr[xi + 1];
+    dst_ptr[0] = BLENDER(a, b, x & 0xffff);
+  }
+}
+#undef BLENDER
+
+void ScaleRowDown38_C(const uint8_t* src_ptr,
+                      ptrdiff_t src_stride,
+                      uint8_t* dst,
+                      int dst_width) {
+  int x;
+  (void)src_stride;
+  assert(dst_width % 3 == 0);
+  for (x = 0; x < dst_width; x += 3) {
+    dst[0] = src_ptr[0];
+    dst[1] = src_ptr[3];
+    dst[2] = src_ptr[6];
+    dst += 3;
+    src_ptr += 8;
+  }
+}
+
+void ScaleRowDown38_16_C(const uint16_t* src_ptr,
+                         ptrdiff_t src_stride,
+                         uint16_t* dst,
+                         int dst_width) {
+  int x;
+  (void)src_stride;
+  assert(dst_width % 3 == 0);
+  for (x = 0; x < dst_width; x += 3) {
+    dst[0] = src_ptr[0];
+    dst[1] = src_ptr[3];
+    dst[2] = src_ptr[6];
+    dst += 3;
+    src_ptr += 8;
+  }
+}
+
+// 8x3 -> 3x1
+void ScaleRowDown38_3_Box_C(const uint8_t* src_ptr,
+                            ptrdiff_t src_stride,
+                            uint8_t* dst_ptr,
+                            int dst_width) {
+  intptr_t stride = src_stride;
+  int i;
+  assert((dst_width % 3 == 0) && (dst_width > 0));
+  for (i = 0; i < dst_width; i += 3) {
+    dst_ptr[0] =
+        (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[stride + 0] +
+         src_ptr[stride + 1] + src_ptr[stride + 2] + src_ptr[stride * 2 + 0] +
+         src_ptr[stride * 2 + 1] + src_ptr[stride * 2 + 2]) *
+            (65536 / 9) >>
+        16;
+    dst_ptr[1] =
+        (src_ptr[3] + src_ptr[4] + src_ptr[5] + src_ptr[stride + 3] +
+         src_ptr[stride + 4] + src_ptr[stride + 5] + src_ptr[stride * 2 + 3] +
+         src_ptr[stride * 2 + 4] + src_ptr[stride * 2 + 5]) *
+            (65536 / 9) >>
+        16;
+    dst_ptr[2] =
+        (src_ptr[6] + src_ptr[7] + src_ptr[stride + 6] + src_ptr[stride + 7] +
+         src_ptr[stride * 2 + 6] + src_ptr[stride * 2 + 7]) *
+            (65536 / 6) >>
+        16;
+    src_ptr += 8;
+    dst_ptr += 3;
+  }
+}
+
+void ScaleRowDown38_3_Box_16_C(const uint16_t* src_ptr,
+                               ptrdiff_t src_stride,
+                               uint16_t* dst_ptr,
+                               int dst_width) {
+  intptr_t stride = src_stride;
+  int i;
+  assert((dst_width % 3 == 0) && (dst_width > 0));
+  for (i = 0; i < dst_width; i += 3) {
+    dst_ptr[0] =
+        (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[stride + 0] +
+         src_ptr[stride + 1] + src_ptr[stride + 2] + src_ptr[stride * 2 + 0] +
+         src_ptr[stride * 2 + 1] + src_ptr[stride * 2 + 2]) *
+            (65536 / 9) >>
+        16;
+    dst_ptr[1] =
+        (src_ptr[3] + src_ptr[4] + src_ptr[5] + src_ptr[stride + 3] +
+         src_ptr[stride + 4] + src_ptr[stride + 5] + src_ptr[stride * 2 + 3] +
+         src_ptr[stride * 2 + 4] + src_ptr[stride * 2 + 5]) *
+            (65536 / 9) >>
+        16;
+    dst_ptr[2] =
+        (src_ptr[6] + src_ptr[7] + src_ptr[stride + 6] + src_ptr[stride + 7] +
+         src_ptr[stride * 2 + 6] + src_ptr[stride * 2 + 7]) *
+            (65536 / 6) >>
+        16;
+    src_ptr += 8;
+    dst_ptr += 3;
+  }
+}
+
+// 8x2 -> 3x1
+void ScaleRowDown38_2_Box_C(const uint8_t* src_ptr,
+                            ptrdiff_t src_stride,
+                            uint8_t* dst_ptr,
+                            int dst_width) {
+  intptr_t stride = src_stride;
+  int i;
+  assert((dst_width % 3 == 0) && (dst_width > 0));
+  for (i = 0; i < dst_width; i += 3) {
+    dst_ptr[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[stride + 0] +
+                  src_ptr[stride + 1] + src_ptr[stride + 2]) *
+                     (65536 / 6) >>
+                 16;
+    dst_ptr[1] = (src_ptr[3] + src_ptr[4] + src_ptr[5] + src_ptr[stride + 3] +
+                  src_ptr[stride + 4] + src_ptr[stride + 5]) *
+                     (65536 / 6) >>
+                 16;
+    dst_ptr[2] =
+        (src_ptr[6] + src_ptr[7] + src_ptr[stride + 6] + src_ptr[stride + 7]) *
+            (65536 / 4) >>
+        16;
+    src_ptr += 8;
+    dst_ptr += 3;
+  }
+}
+
+void ScaleRowDown38_2_Box_16_C(const uint16_t* src_ptr,
+                               ptrdiff_t src_stride,
+                               uint16_t* dst_ptr,
+                               int dst_width) {
+  intptr_t stride = src_stride;
+  int i;
+  assert((dst_width % 3 == 0) && (dst_width > 0));
+  for (i = 0; i < dst_width; i += 3) {
+    dst_ptr[0] = (src_ptr[0] + src_ptr[1] + src_ptr[2] + src_ptr[stride + 0] +
+                  src_ptr[stride + 1] + src_ptr[stride + 2]) *
+                     (65536 / 6) >>
+                 16;
+    dst_ptr[1] = (src_ptr[3] + src_ptr[4] + src_ptr[5] + src_ptr[stride + 3] +
+                  src_ptr[stride + 4] + src_ptr[stride + 5]) *
+                     (65536 / 6) >>
+                 16;
+    dst_ptr[2] =
+        (src_ptr[6] + src_ptr[7] + src_ptr[stride + 6] + src_ptr[stride + 7]) *
+            (65536 / 4) >>
+        16;
+    src_ptr += 8;
+    dst_ptr += 3;
+  }
+}
+
+void ScaleAddRow_C(const uint8_t* src_ptr, uint16_t* dst_ptr, int src_width) {
+  int x;
+  assert(src_width > 0);
+  for (x = 0; x < src_width - 1; x += 2) {
+    dst_ptr[0] += src_ptr[0];
+    dst_ptr[1] += src_ptr[1];
+    src_ptr += 2;
+    dst_ptr += 2;
+  }
+  if (src_width & 1) {
+    dst_ptr[0] += src_ptr[0];
+  }
+}
+
+void ScaleAddRow_16_C(const uint16_t* src_ptr,
+                      uint32_t* dst_ptr,
+                      int src_width) {
+  int x;
+  assert(src_width > 0);
+  for (x = 0; x < src_width - 1; x += 2) {
+    dst_ptr[0] += src_ptr[0];
+    dst_ptr[1] += src_ptr[1];
+    src_ptr += 2;
+    dst_ptr += 2;
+  }
+  if (src_width & 1) {
+    dst_ptr[0] += src_ptr[0];
+  }
+}
+
+void ScaleARGBRowDown2_C(const uint8_t* src_argb,
+                         ptrdiff_t src_stride,
+                         uint8_t* dst_argb,
+                         int dst_width) {
+  const uint32_t* src = (const uint32_t*)(src_argb);
+  uint32_t* dst = (uint32_t*)(dst_argb);
+  int x;
+  (void)src_stride;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = src[1];
+    dst[1] = src[3];
+    src += 4;
+    dst += 2;
+  }
+  if (dst_width & 1) {
+    dst[0] = src[1];
+  }
+}
+
+void ScaleARGBRowDown2Linear_C(const uint8_t* src_argb,
+                               ptrdiff_t src_stride,
+                               uint8_t* dst_argb,
+                               int dst_width) {
+  int x;
+  (void)src_stride;
+  for (x = 0; x < dst_width; ++x) {
+    dst_argb[0] = (src_argb[0] + src_argb[4] + 1) >> 1;
+    dst_argb[1] = (src_argb[1] + src_argb[5] + 1) >> 1;
+    dst_argb[2] = (src_argb[2] + src_argb[6] + 1) >> 1;
+    dst_argb[3] = (src_argb[3] + src_argb[7] + 1) >> 1;
+    src_argb += 8;
+    dst_argb += 4;
+  }
+}
+
+void ScaleARGBRowDown2Box_C(const uint8_t* src_argb,
+                            ptrdiff_t src_stride,
+                            uint8_t* dst_argb,
+                            int dst_width) {
+  int x;
+  for (x = 0; x < dst_width; ++x) {
+    dst_argb[0] = (src_argb[0] + src_argb[4] + src_argb[src_stride] +
+                   src_argb[src_stride + 4] + 2) >>
+                  2;
+    dst_argb[1] = (src_argb[1] + src_argb[5] + src_argb[src_stride + 1] +
+                   src_argb[src_stride + 5] + 2) >>
+                  2;
+    dst_argb[2] = (src_argb[2] + src_argb[6] + src_argb[src_stride + 2] +
+                   src_argb[src_stride + 6] + 2) >>
+                  2;
+    dst_argb[3] = (src_argb[3] + src_argb[7] + src_argb[src_stride + 3] +
+                   src_argb[src_stride + 7] + 2) >>
+                  2;
+    src_argb += 8;
+    dst_argb += 4;
+  }
+}
+
+void ScaleARGBRowDownEven_C(const uint8_t* src_argb,
+                            ptrdiff_t src_stride,
+                            int src_stepx,
+                            uint8_t* dst_argb,
+                            int dst_width) {
+  const uint32_t* src = (const uint32_t*)(src_argb);
+  uint32_t* dst = (uint32_t*)(dst_argb);
+  (void)src_stride;
+  int x;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    dst[0] = src[0];
+    dst[1] = src[src_stepx];
+    src += src_stepx * 2;
+    dst += 2;
+  }
+  if (dst_width & 1) {
+    dst[0] = src[0];
+  }
+}
+
+void ScaleARGBRowDownEvenBox_C(const uint8_t* src_argb,
+                               ptrdiff_t src_stride,
+                               int src_stepx,
+                               uint8_t* dst_argb,
+                               int dst_width) {
+  int x;
+  for (x = 0; x < dst_width; ++x) {
+    dst_argb[0] = (src_argb[0] + src_argb[4] + src_argb[src_stride] +
+                   src_argb[src_stride + 4] + 2) >>
+                  2;
+    dst_argb[1] = (src_argb[1] + src_argb[5] + src_argb[src_stride + 1] +
+                   src_argb[src_stride + 5] + 2) >>
+                  2;
+    dst_argb[2] = (src_argb[2] + src_argb[6] + src_argb[src_stride + 2] +
+                   src_argb[src_stride + 6] + 2) >>
+                  2;
+    dst_argb[3] = (src_argb[3] + src_argb[7] + src_argb[src_stride + 3] +
+                   src_argb[src_stride + 7] + 2) >>
+                  2;
+    src_argb += src_stepx * 4;
+    dst_argb += 4;
+  }
+}
+
+// Scales a single row of pixels using point sampling.
+void ScaleARGBCols_C(uint8_t* dst_argb,
+                     const uint8_t* src_argb,
+                     int dst_width,
+                     int x,
+                     int dx) {
+  const uint32_t* src = (const uint32_t*)(src_argb);
+  uint32_t* dst = (uint32_t*)(dst_argb);
+  int j;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    dst[0] = src[x >> 16];
+    x += dx;
+    dst[1] = src[x >> 16];
+    x += dx;
+    dst += 2;
+  }
+  if (dst_width & 1) {
+    dst[0] = src[x >> 16];
+  }
+}
+
+void ScaleARGBCols64_C(uint8_t* dst_argb,
+                       const uint8_t* src_argb,
+                       int dst_width,
+                       int x32,
+                       int dx) {
+  int64_t x = (int64_t)(x32);
+  const uint32_t* src = (const uint32_t*)(src_argb);
+  uint32_t* dst = (uint32_t*)(dst_argb);
+  int j;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    dst[0] = src[x >> 16];
+    x += dx;
+    dst[1] = src[x >> 16];
+    x += dx;
+    dst += 2;
+  }
+  if (dst_width & 1) {
+    dst[0] = src[x >> 16];
+  }
+}
+
+// Scales a single row of pixels up by 2x using point sampling.
+void ScaleARGBColsUp2_C(uint8_t* dst_argb,
+                        const uint8_t* src_argb,
+                        int dst_width,
+                        int x,
+                        int dx) {
+  const uint32_t* src = (const uint32_t*)(src_argb);
+  uint32_t* dst = (uint32_t*)(dst_argb);
+  int j;
+  (void)x;
+  (void)dx;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    dst[1] = dst[0] = src[0];
+    src += 1;
+    dst += 2;
+  }
+  if (dst_width & 1) {
+    dst[0] = src[0];
+  }
+}
+
+// TODO(fbarchard): Replace 0x7f ^ f with 128-f.  bug=607.
+// Mimics SSSE3 blender
+#define BLENDER1(a, b, f) ((a) * (0x7f ^ f) + (b)*f) >> 7
+#define BLENDERC(a, b, f, s) \
+  (uint32_t)(BLENDER1(((a) >> s) & 255, ((b) >> s) & 255, f) << s)
+#define BLENDER(a, b, f)                                                 \
+  BLENDERC(a, b, f, 24) | BLENDERC(a, b, f, 16) | BLENDERC(a, b, f, 8) | \
+      BLENDERC(a, b, f, 0)
+
+void ScaleARGBFilterCols_C(uint8_t* dst_argb,
+                           const uint8_t* src_argb,
+                           int dst_width,
+                           int x,
+                           int dx) {
+  const uint32_t* src = (const uint32_t*)(src_argb);
+  uint32_t* dst = (uint32_t*)(dst_argb);
+  int j;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    int xi = x >> 16;
+    int xf = (x >> 9) & 0x7f;
+    uint32_t a = src[xi];
+    uint32_t b = src[xi + 1];
+    dst[0] = BLENDER(a, b, xf);
+    x += dx;
+    xi = x >> 16;
+    xf = (x >> 9) & 0x7f;
+    a = src[xi];
+    b = src[xi + 1];
+    dst[1] = BLENDER(a, b, xf);
+    x += dx;
+    dst += 2;
+  }
+  if (dst_width & 1) {
+    int xi = x >> 16;
+    int xf = (x >> 9) & 0x7f;
+    uint32_t a = src[xi];
+    uint32_t b = src[xi + 1];
+    dst[0] = BLENDER(a, b, xf);
+  }
+}
+
+void ScaleARGBFilterCols64_C(uint8_t* dst_argb,
+                             const uint8_t* src_argb,
+                             int dst_width,
+                             int x32,
+                             int dx) {
+  int64_t x = (int64_t)(x32);
+  const uint32_t* src = (const uint32_t*)(src_argb);
+  uint32_t* dst = (uint32_t*)(dst_argb);
+  int j;
+  for (j = 0; j < dst_width - 1; j += 2) {
+    int64_t xi = x >> 16;
+    int xf = (x >> 9) & 0x7f;
+    uint32_t a = src[xi];
+    uint32_t b = src[xi + 1];
+    dst[0] = BLENDER(a, b, xf);
+    x += dx;
+    xi = x >> 16;
+    xf = (x >> 9) & 0x7f;
+    a = src[xi];
+    b = src[xi + 1];
+    dst[1] = BLENDER(a, b, xf);
+    x += dx;
+    dst += 2;
+  }
+  if (dst_width & 1) {
+    int64_t xi = x >> 16;
+    int xf = (x >> 9) & 0x7f;
+    uint32_t a = src[xi];
+    uint32_t b = src[xi + 1];
+    dst[0] = BLENDER(a, b, xf);
+  }
+}
+#undef BLENDER1
+#undef BLENDERC
+#undef BLENDER
+
+// Scale plane vertically with bilinear interpolation.
+void ScalePlaneVertical(int src_height,
+                        int dst_width,
+                        int dst_height,
+                        int src_stride,
+                        int dst_stride,
+                        const uint8_t* src_argb,
+                        uint8_t* dst_argb,
+                        int x,
+                        int y,
+                        int dy,
+                        int bpp,
+                        enum FilterMode filtering) {
+  // TODO(fbarchard): Allow higher bpp.
+  int dst_width_bytes = dst_width * bpp;
+  void (*InterpolateRow)(uint8_t * dst_argb, const uint8_t* src_argb,
+                         ptrdiff_t src_stride, int dst_width,
+                         int source_y_fraction) = InterpolateRow_C;
+  const int max_y = (src_height > 1) ? ((src_height - 1) << 16) - 1 : 0;
+  int j;
+  assert(bpp >= 1 && bpp <= 4);
+  assert(src_height != 0);
+  assert(dst_width > 0);
+  assert(dst_height > 0);
+  src_argb += (x >> 16) * bpp;
+#if defined(HAS_INTERPOLATEROW_SSSE3)
+  if (TestCpuFlag(kCpuHasSSSE3)) {
+    InterpolateRow = InterpolateRow_Any_SSSE3;
+    if (IS_ALIGNED(dst_width_bytes, 16)) {
+      InterpolateRow = InterpolateRow_SSSE3;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_AVX2)
+  if (TestCpuFlag(kCpuHasAVX2)) {
+    InterpolateRow = InterpolateRow_Any_AVX2;
+    if (IS_ALIGNED(dst_width_bytes, 32)) {
+      InterpolateRow = InterpolateRow_AVX2;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_NEON)
+  if (TestCpuFlag(kCpuHasNEON)) {
+    InterpolateRow = InterpolateRow_Any_NEON;
+    if (IS_ALIGNED(dst_width_bytes, 16)) {
+      InterpolateRow = InterpolateRow_NEON;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_MSA)
+  if (TestCpuFlag(kCpuHasMSA)) {
+    InterpolateRow = InterpolateRow_Any_MSA;
+    if (IS_ALIGNED(dst_width_bytes, 32)) {
+      InterpolateRow = InterpolateRow_MSA;
+    }
+  }
+#endif
+  for (j = 0; j < dst_height; ++j) {
+    int yi;
+    int yf;
+    if (y > max_y) {
+      y = max_y;
+    }
+    yi = y >> 16;
+    yf = filtering ? ((y >> 8) & 255) : 0;
+    InterpolateRow(dst_argb, src_argb + yi * src_stride, src_stride,
+                   dst_width_bytes, yf);
+    dst_argb += dst_stride;
+    y += dy;
+  }
+}
+void ScalePlaneVertical_16(int src_height,
+                           int dst_width,
+                           int dst_height,
+                           int src_stride,
+                           int dst_stride,
+                           const uint16_t* src_argb,
+                           uint16_t* dst_argb,
+                           int x,
+                           int y,
+                           int dy,
+                           int wpp,
+                           enum FilterMode filtering) {
+  // TODO(fbarchard): Allow higher wpp.
+  int dst_width_words = dst_width * wpp;
+  void (*InterpolateRow)(uint16_t * dst_argb, const uint16_t* src_argb,
+                         ptrdiff_t src_stride, int dst_width,
+                         int source_y_fraction) = InterpolateRow_16_C;
+  const int max_y = (src_height > 1) ? ((src_height - 1) << 16) - 1 : 0;
+  int j;
+  assert(wpp >= 1 && wpp <= 2);
+  assert(src_height != 0);
+  assert(dst_width > 0);
+  assert(dst_height > 0);
+  src_argb += (x >> 16) * wpp;
+#if defined(HAS_INTERPOLATEROW_16_SSE2)
+  if (TestCpuFlag(kCpuHasSSE2)) {
+    InterpolateRow = InterpolateRow_Any_16_SSE2;
+    if (IS_ALIGNED(dst_width_bytes, 16)) {
+      InterpolateRow = InterpolateRow_16_SSE2;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_16_SSSE3)
+  if (TestCpuFlag(kCpuHasSSSE3)) {
+    InterpolateRow = InterpolateRow_Any_16_SSSE3;
+    if (IS_ALIGNED(dst_width_bytes, 16)) {
+      InterpolateRow = InterpolateRow_16_SSSE3;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_16_AVX2)
+  if (TestCpuFlag(kCpuHasAVX2)) {
+    InterpolateRow = InterpolateRow_Any_16_AVX2;
+    if (IS_ALIGNED(dst_width_bytes, 32)) {
+      InterpolateRow = InterpolateRow_16_AVX2;
+    }
+  }
+#endif
+#if defined(HAS_INTERPOLATEROW_16_NEON)
+  if (TestCpuFlag(kCpuHasNEON)) {
+    InterpolateRow = InterpolateRow_Any_16_NEON;
+    if (IS_ALIGNED(dst_width_bytes, 16)) {
+      InterpolateRow = InterpolateRow_16_NEON;
+    }
+  }
+#endif
+  for (j = 0; j < dst_height; ++j) {
+    int yi;
+    int yf;
+    if (y > max_y) {
+      y = max_y;
+    }
+    yi = y >> 16;
+    yf = filtering ? ((y >> 8) & 255) : 0;
+    InterpolateRow(dst_argb, src_argb + yi * src_stride, src_stride,
+                   dst_width_words, yf);
+    dst_argb += dst_stride;
+    y += dy;
+  }
+}
+
+// Simplify the filtering based on scale factors.
+enum FilterMode ScaleFilterReduce(int src_width,
+                                  int src_height,
+                                  int dst_width,
+                                  int dst_height,
+                                  enum FilterMode filtering) {
+  if (src_width < 0) {
+    src_width = -src_width;
+  }
+  if (src_height < 0) {
+    src_height = -src_height;
+  }
+  if (filtering == kFilterBox) {
+    // If scaling both axis to 0.5 or larger, switch from Box to Bilinear.
+    if (dst_width * 2 >= src_width && dst_height * 2 >= src_height) {
+      filtering = kFilterBilinear;
+    }
+  }
+  if (filtering == kFilterBilinear) {
+    if (src_height == 1) {
+      filtering = kFilterLinear;
+    }
+    // TODO(fbarchard): Detect any odd scale factor and reduce to Linear.
+    if (dst_height == src_height || dst_height * 3 == src_height) {
+      filtering = kFilterLinear;
+    }
+    // TODO(fbarchard): Remove 1 pixel wide filter restriction, which is to
+    // avoid reading 2 pixels horizontally that causes memory exception.
+    if (src_width == 1) {
+      filtering = kFilterNone;
+    }
+  }
+  if (filtering == kFilterLinear) {
+    if (src_width == 1) {
+      filtering = kFilterNone;
+    }
+    // TODO(fbarchard): Detect any odd scale factor and reduce to None.
+    if (dst_width == src_width || dst_width * 3 == src_width) {
+      filtering = kFilterNone;
+    }
+  }
+  return filtering;
+}
+
+// Divide num by div and return as 16.16 fixed point result.
+int FixedDiv_C(int num, int div) {
+  return (int)(((int64_t)(num) << 16) / div);
+}
+
+// Divide num by div and return as 16.16 fixed point result.
+int FixedDiv1_C(int num, int div) {
+  return (int)((((int64_t)(num) << 16) - 0x00010001) / (div - 1));
+}
+
+#define CENTERSTART(dx, s) (dx < 0) ? -((-dx >> 1) + s) : ((dx >> 1) + s)
+
+// Compute slope values for stepping.
+void ScaleSlope(int src_width,
+                int src_height,
+                int dst_width,
+                int dst_height,
+                enum FilterMode filtering,
+                int* x,
+                int* y,
+                int* dx,
+                int* dy) {
+  assert(x != NULL);
+  assert(y != NULL);
+  assert(dx != NULL);
+  assert(dy != NULL);
+  assert(src_width != 0);
+  assert(src_height != 0);
+  assert(dst_width > 0);
+  assert(dst_height > 0);
+  // Check for 1 pixel and avoid FixedDiv overflow.
+  if (dst_width == 1 && src_width >= 32768) {
+    dst_width = src_width;
+  }
+  if (dst_height == 1 && src_height >= 32768) {
+    dst_height = src_height;
+  }
+  if (filtering == kFilterBox) {
+    // Scale step for point sampling duplicates all pixels equally.
+    *dx = FixedDiv(Abs(src_width), dst_width);
+    *dy = FixedDiv(src_height, dst_height);
+    *x = 0;
+    *y = 0;
+  } else if (filtering == kFilterBilinear) {
+    // Scale step for bilinear sampling renders last pixel once for upsample.
+    if (dst_width <= Abs(src_width)) {
+      *dx = FixedDiv(Abs(src_width), dst_width);
+      *x = CENTERSTART(*dx, -32768);  // Subtract 0.5 (32768) to center filter.
+    } else if (dst_width > 1) {
+      *dx = FixedDiv1(Abs(src_width), dst_width);
+      *x = 0;
+    }
+    if (dst_height <= src_height) {
+      *dy = FixedDiv(src_height, dst_height);
+      *y = CENTERSTART(*dy, -32768);  // Subtract 0.5 (32768) to center filter.
+    } else if (dst_height > 1) {
+      *dy = FixedDiv1(src_height, dst_height);
+      *y = 0;
+    }
+  } else if (filtering == kFilterLinear) {
+    // Scale step for bilinear sampling renders last pixel once for upsample.
+    if (dst_width <= Abs(src_width)) {
+      *dx = FixedDiv(Abs(src_width), dst_width);
+      *x = CENTERSTART(*dx, -32768);  // Subtract 0.5 (32768) to center filter.
+    } else if (dst_width > 1) {
+      *dx = FixedDiv1(Abs(src_width), dst_width);
+      *x = 0;
+    }
+    *dy = FixedDiv(src_height, dst_height);
+    *y = *dy >> 1;
+  } else {
+    // Scale step for point sampling duplicates all pixels equally.
+    *dx = FixedDiv(Abs(src_width), dst_width);
+    *dy = FixedDiv(src_height, dst_height);
+    *x = CENTERSTART(*dx, 0);
+    *y = CENTERSTART(*dy, 0);
+  }
+  // Negative src_width means horizontally mirror.
+  if (src_width < 0) {
+    *x += (dst_width - 1) * *dx;
+    *dx = -*dx;
+    // src_width = -src_width;   // Caller must do this.
+  }
+}
+#undef CENTERSTART
+
+// Read 8x2 upsample with filtering and write 16x1.
+// actually reads an extra pixel, so 9x2.
+void ScaleRowUp2_16_C(const uint16_t* src_ptr,
+                      ptrdiff_t src_stride,
+                      uint16_t* dst,
+                      int dst_width) {
+  const uint16_t* src2 = src_ptr + src_stride;
+
+  int x;
+  for (x = 0; x < dst_width - 1; x += 2) {
+    uint16_t p0 = src_ptr[0];
+    uint16_t p1 = src_ptr[1];
+    uint16_t p2 = src2[0];
+    uint16_t p3 = src2[1];
+    dst[0] = (p0 * 9 + p1 * 3 + p2 * 3 + p3 + 8) >> 4;
+    dst[1] = (p0 * 3 + p1 * 9 + p2 + p3 * 3 + 8) >> 4;
+    ++src_ptr;
+    ++src2;
+    dst += 2;
+  }
+  if (dst_width & 1) {
+    uint16_t p0 = src_ptr[0];
+    uint16_t p1 = src_ptr[1];
+    uint16_t p2 = src2[0];
+    uint16_t p3 = src2[1];
+    dst[0] = (p0 * 9 + p1 * 3 + p2 * 3 + p3 + 8) >> 4;
+  }
+}
+
+#ifdef __cplusplus
+}  // extern "C"
+}  // namespace libyuv
+#endif