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diff --git a/media/libvpx/libvpx/test/vpx_scale_test.h b/media/libvpx/libvpx/test/vpx_scale_test.h
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+/*
+ *  Copyright (c) 2014 The WebM 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.
+ */
+
+#ifndef VPX_TEST_VPX_SCALE_TEST_H_
+#define VPX_TEST_VPX_SCALE_TEST_H_
+
+#include "third_party/googletest/src/include/gtest/gtest.h"
+
+#include "./vpx_config.h"
+#include "./vpx_scale_rtcd.h"
+#include "test/acm_random.h"
+#include "test/clear_system_state.h"
+#include "test/register_state_check.h"
+#include "vpx_mem/vpx_mem.h"
+#include "vpx_scale/yv12config.h"
+
+using libvpx_test::ACMRandom;
+
+namespace libvpx_test {
+
+class VpxScaleBase {
+ public:
+  virtual ~VpxScaleBase() { libvpx_test::ClearSystemState(); }
+
+  void ResetImage(YV12_BUFFER_CONFIG *const img, const int width,
+                  const int height) {
+    memset(img, 0, sizeof(*img));
+    ASSERT_EQ(
+        0, vp8_yv12_alloc_frame_buffer(img, width, height, VP8BORDERINPIXELS))
+        << "for width: " << width << " height: " << height;
+    memset(img->buffer_alloc, kBufFiller, img->frame_size);
+  }
+
+  void ResetImages(const int width, const int height) {
+    ResetImage(&img_, width, height);
+    ResetImage(&ref_img_, width, height);
+    ResetImage(&dst_img_, width, height);
+
+    FillPlane(img_.y_buffer, img_.y_crop_width, img_.y_crop_height,
+              img_.y_stride);
+    FillPlane(img_.u_buffer, img_.uv_crop_width, img_.uv_crop_height,
+              img_.uv_stride);
+    FillPlane(img_.v_buffer, img_.uv_crop_width, img_.uv_crop_height,
+              img_.uv_stride);
+  }
+
+  void ResetScaleImage(YV12_BUFFER_CONFIG *const img, const int width,
+                       const int height) {
+    memset(img, 0, sizeof(*img));
+#if CONFIG_VP9_HIGHBITDEPTH
+    ASSERT_EQ(0, vpx_alloc_frame_buffer(img, width, height, 1, 1, 0,
+                                        VP9_ENC_BORDER_IN_PIXELS, 0));
+#else
+    ASSERT_EQ(0, vpx_alloc_frame_buffer(img, width, height, 1, 1,
+                                        VP9_ENC_BORDER_IN_PIXELS, 0));
+#endif
+    memset(img->buffer_alloc, kBufFiller, img->frame_size);
+  }
+
+  void ResetScaleImages(const int src_width, const int src_height,
+                        const int dst_width, const int dst_height) {
+    ResetScaleImage(&img_, src_width, src_height);
+    ResetScaleImage(&ref_img_, dst_width, dst_height);
+    ResetScaleImage(&dst_img_, dst_width, dst_height);
+    FillPlaneExtreme(img_.y_buffer, img_.y_crop_width, img_.y_crop_height,
+                     img_.y_stride);
+    FillPlaneExtreme(img_.u_buffer, img_.uv_crop_width, img_.uv_crop_height,
+                     img_.uv_stride);
+    FillPlaneExtreme(img_.v_buffer, img_.uv_crop_width, img_.uv_crop_height,
+                     img_.uv_stride);
+  }
+
+  void DeallocImages() {
+    vp8_yv12_de_alloc_frame_buffer(&img_);
+    vp8_yv12_de_alloc_frame_buffer(&ref_img_);
+    vp8_yv12_de_alloc_frame_buffer(&dst_img_);
+  }
+
+  void DeallocScaleImages() {
+    vpx_free_frame_buffer(&img_);
+    vpx_free_frame_buffer(&ref_img_);
+    vpx_free_frame_buffer(&dst_img_);
+  }
+
+ protected:
+  static const int kBufFiller = 123;
+  static const int kBufMax = kBufFiller - 1;
+
+  static void FillPlane(uint8_t *const buf, const int width, const int height,
+                        const int stride) {
+    for (int y = 0; y < height; ++y) {
+      for (int x = 0; x < width; ++x) {
+        buf[x + (y * stride)] = (x + (width * y)) % kBufMax;
+      }
+    }
+  }
+
+  static void FillPlaneExtreme(uint8_t *const buf, const int width,
+                               const int height, const int stride) {
+    ACMRandom rnd;
+    for (int y = 0; y < height; ++y) {
+      for (int x = 0; x < width; ++x) {
+        buf[x + (y * stride)] = rnd.Rand8() % 2 ? 255 : 0;
+      }
+    }
+  }
+
+  static void ExtendPlane(uint8_t *buf, int crop_width, int crop_height,
+                          int width, int height, int stride, int padding) {
+    // Copy the outermost visible pixel to a distance of at least 'padding.'
+    // The buffers are allocated such that there may be excess space outside the
+    // padding. As long as the minimum amount of padding is achieved it is not
+    // necessary to fill this space as well.
+    uint8_t *left = buf - padding;
+    uint8_t *right = buf + crop_width;
+    const int right_extend = padding + (width - crop_width);
+    const int bottom_extend = padding + (height - crop_height);
+
+    // Fill the border pixels from the nearest image pixel.
+    for (int y = 0; y < crop_height; ++y) {
+      memset(left, left[padding], padding);
+      memset(right, right[-1], right_extend);
+      left += stride;
+      right += stride;
+    }
+
+    left = buf - padding;
+    uint8_t *top = left - (stride * padding);
+    // The buffer does not always extend as far as the stride.
+    // Equivalent to padding + width + padding.
+    const int extend_width = padding + crop_width + right_extend;
+
+    // The first row was already extended to the left and right. Copy it up.
+    for (int y = 0; y < padding; ++y) {
+      memcpy(top, left, extend_width);
+      top += stride;
+    }
+
+    uint8_t *bottom = left + (crop_height * stride);
+    for (int y = 0; y < bottom_extend; ++y) {
+      memcpy(bottom, left + (crop_height - 1) * stride, extend_width);
+      bottom += stride;
+    }
+  }
+
+  void ReferenceExtendBorder() {
+    ExtendPlane(ref_img_.y_buffer, ref_img_.y_crop_width,
+                ref_img_.y_crop_height, ref_img_.y_width, ref_img_.y_height,
+                ref_img_.y_stride, ref_img_.border);
+    ExtendPlane(ref_img_.u_buffer, ref_img_.uv_crop_width,
+                ref_img_.uv_crop_height, ref_img_.uv_width, ref_img_.uv_height,
+                ref_img_.uv_stride, ref_img_.border / 2);
+    ExtendPlane(ref_img_.v_buffer, ref_img_.uv_crop_width,
+                ref_img_.uv_crop_height, ref_img_.uv_width, ref_img_.uv_height,
+                ref_img_.uv_stride, ref_img_.border / 2);
+  }
+
+  void ReferenceCopyFrame() {
+    // Copy img_ to ref_img_ and extend frame borders. This will be used for
+    // verifying extend_fn_ as well as copy_frame_fn_.
+    EXPECT_EQ(ref_img_.frame_size, img_.frame_size);
+    for (int y = 0; y < img_.y_crop_height; ++y) {
+      for (int x = 0; x < img_.y_crop_width; ++x) {
+        ref_img_.y_buffer[x + y * ref_img_.y_stride] =
+            img_.y_buffer[x + y * img_.y_stride];
+      }
+    }
+
+    for (int y = 0; y < img_.uv_crop_height; ++y) {
+      for (int x = 0; x < img_.uv_crop_width; ++x) {
+        ref_img_.u_buffer[x + y * ref_img_.uv_stride] =
+            img_.u_buffer[x + y * img_.uv_stride];
+        ref_img_.v_buffer[x + y * ref_img_.uv_stride] =
+            img_.v_buffer[x + y * img_.uv_stride];
+      }
+    }
+
+    ReferenceExtendBorder();
+  }
+
+  void CompareImages(const YV12_BUFFER_CONFIG actual) {
+    EXPECT_EQ(ref_img_.frame_size, actual.frame_size);
+    EXPECT_EQ(0, memcmp(ref_img_.buffer_alloc, actual.buffer_alloc,
+                        ref_img_.frame_size));
+  }
+
+  YV12_BUFFER_CONFIG img_;
+  YV12_BUFFER_CONFIG ref_img_;
+  YV12_BUFFER_CONFIG dst_img_;
+};
+
+}  // namespace libvpx_test
+
+#endif  // VPX_TEST_VPX_SCALE_TEST_H_