Added unit test for vp8_post_proc_down_and_across

This is a unit test for the post-processing functions:
- vp8_post_proc_down_and_across_c
- vp8_post_proc_down_and_across_mmx
- vp8_post_proc_down_and_across_xmm

Change-Id: Iec3e690327b17470209c00417835473f6d9a35d6

test/pp_filter_test.cc

+/*
+ *  Copyright (c) 2012 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.
+ */
+#include "third_party/googletest/src/include/gtest/gtest.h"
+extern "C" {
+#include "vpx_config.h"
+#include "vpx_rtcd.h"
+#include "vpx/vpx_integer.h"
+#include "vpx_mem/vpx_mem.h"
+}
+
+typedef void (*post_proc_func_t)(unsigned char *src_ptr,
+                                 unsigned char *dst_ptr,
+                                 int src_pixels_per_line,
+                                 int dst_pixels_per_line,
+                                 int rows,
+                                 int cols,
+                                 int flimit);
+
+namespace {
+
+class Vp8PostProcessingFilterTest
+    : public ::testing::TestWithParam<post_proc_func_t> {};
+
+// Test routine for the VP8 post-processing function
+// vp8_post_proc_down_and_across_c.
+
+TEST_P(Vp8PostProcessingFilterTest, FilterOutputCheck) {
+  // Size of the underlying data block that will be filtered.
+  const int block_width  = 16;
+  const int block_height = 16;
+
+  // 5-tap filter needs 2 padding rows above and below the block in the input.
+  const int input_width = block_width;
+  const int input_height = block_height + 4;
+  const int input_stride = input_width;
+  const int input_size = input_width * input_height;
+
+  // Filter extends output block by 8 samples at left and right edges.
+  const int output_width = block_width + 16;
+  const int output_height = block_height;
+  const int output_stride = output_width;
+  const int output_size = output_width * output_height;
+
+  uint8_t *const src_image =
+      reinterpret_cast<uint8_t*>(vpx_calloc(input_size, 1));
+  uint8_t *const dst_image =
+      reinterpret_cast<uint8_t*>(vpx_calloc(output_size, 1));
+
+  // Pointers to top-left pixel of block in the input and output images.
+  uint8_t *const src_image_ptr = src_image + (input_stride << 1);
+  uint8_t *const dst_image_ptr = dst_image + 8;
+
+  // Initialize pixels in the input:
+  //   block pixels to value 1,
+  //   border pixels to value 10.
+  (void)vpx_memset(src_image, 10, input_size);
+  uint8_t *pixel_ptr = src_image_ptr;
+  for (int i = 0; i < block_height; ++i) {
+    for (int j = 0; j < block_width; ++j) {
+      pixel_ptr[j] = 1;
+    }
+    pixel_ptr += input_stride;
+  }
+
+  // Initialize pixels in the output to 99.
+  (void)vpx_memset(dst_image, 99, output_size);
+
+  GetParam()(src_image_ptr, dst_image_ptr, input_stride,
+             output_stride, block_height, block_width,
+             255);
+
+  static const uint8_t expected_data[block_height] = {
+    3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3
+  };
+
+  pixel_ptr = dst_image;
+  for (int i = 0; i < block_height; ++i) {
+    for (int j = 0; j < block_width; ++j) {
+      EXPECT_EQ(expected_data[i], pixel_ptr[j])
+          << "Vp8PostProcessingFilterTest failed with invalid filter output";
+    }
+    pixel_ptr += output_stride;
+  }
+
+  vpx_free(src_image);
+  vpx_free(dst_image);
+};
+
+INSTANTIATE_TEST_CASE_P(C, Vp8PostProcessingFilterTest,
+                        ::testing::Values(vp8_post_proc_down_and_across_c));
+
+#if HAVE_MMX
+INSTANTIATE_TEST_CASE_P(MMX, Vp8PostProcessingFilterTest,
+                        ::testing::Values(vp8_post_proc_down_and_across_mmx));
+#endif
+
+#if HAVE_SSE2
+INSTANTIATE_TEST_CASE_P(SSE2, Vp8PostProcessingFilterTest,
+                        ::testing::Values(vp8_post_proc_down_and_across_xmm));
+#endif
+
+}  // namespace

test/test.mk

@@ -5,6 +5,7 @@ LIBVPX_TEST_SRCS-yes += encode_test_driver.cc
 LIBVPX_TEST_SRCS-yes += encode_test_driver.h
 LIBVPX_TEST_SRCS-yes += idctllm_test.cc
 LIBVPX_TEST_SRCS-yes += keyframe_test.cc
+LIBVPX_TEST_SRCS-yes += pp_filter_test.cc
 LIBVPX_TEST_SRCS-yes += resize_test.cc
 LIBVPX_TEST_SRCS-yes += test_libvpx.cc
 LIBVPX_TEST_SRCS-yes += video_source.h