Initial population of libyuv
Change-Id: I46a6a1525aebaba979b0f2ca5b58be2004901410
diff --git a/files/unit_test/scale_test.cc b/files/unit_test/scale_test.cc
new file mode 100644
index 0000000..e147d78
--- /dev/null
+++ b/files/unit_test/scale_test.cc
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2011 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 "unit_test.h"
+#include <stdlib.h>
+#include <time.h>
+
+using namespace libyuv;
+
+#define align_buffer_16(var, size) \
+ uint8 *var; \
+ uint8 *var##_mem; \
+ var##_mem = reinterpret_cast<uint8*>(calloc(size+15, sizeof(uint8))); \
+ var = reinterpret_cast<uint8*> \
+ ((reinterpret_cast<intptr_t>(var##_mem) + 15) & (~0x0f));
+
+#define free_aligned_buffer_16(var) \
+ free(var##_mem); \
+ var = 0;
+
+TEST_F(libyuvTest, ScaleDownBy4) {
+ int b = 128;
+ int src_width = 1280;
+ int src_height = 720;
+ int src_width_uv = (src_width + 1) >> 1;
+ int src_height_uv = (src_height + 1) >> 1;
+
+ int src_y_plane_size = (src_width + (2 * b)) * (src_height + (2 * b));
+ int src_uv_plane_size = (src_width_uv + (2 * b)) * (src_height_uv + (2 * b));
+
+ int src_stride_y = 2 * b + src_width;
+ int src_stride_uv = 2 * b + src_width_uv;
+
+ align_buffer_16(src_y, src_y_plane_size)
+ align_buffer_16(src_u, src_uv_plane_size)
+ align_buffer_16(src_v, src_uv_plane_size)
+
+ int dst_width = src_width >> 2;
+ int dst_height = src_height >> 2;
+
+ int dst_width_uv = (dst_width + 1) >> 1;
+ int dst_height_uv = (dst_height + 1) >> 1;
+
+ int dst_y_plane_size = (dst_width + (2 * b)) * (dst_height + (2 * b));
+ int dst_uv_plane_size = (dst_width_uv + (2 * b)) * (dst_height_uv + (2 * b));
+
+ int dst_stride_y = 2 * b + dst_width;
+ int dst_stride_uv = 2 * b + dst_width_uv;
+
+ align_buffer_16(dst_y, dst_y_plane_size)
+ align_buffer_16(dst_u, dst_uv_plane_size)
+ align_buffer_16(dst_v, dst_uv_plane_size)
+
+ // create an image with random data reoccurring in 4x4 grid. When the image
+ // is filtered all the values should be the same.
+ srandom(time(NULL));
+
+ uint8 block_data[16];
+
+ int i, j;
+
+ // Pulling 16 random numbers there is an infinitesimally small
+ // chance that they are all 0. Then the output will be all 0.
+ // Output buffer is filled with 0, want to make sure that after the
+ // filtering something went into the output buffer.
+ // Avoid this by setting one of the values to 128. Also set the
+ // random data to at least 1 for when point sampling to prevent
+ // output all being 0.
+ block_data[0] = 128;
+
+ for (i = 1; i < 16; i++)
+ block_data[i] = (random() & 0xfe) + 1;
+
+ for (i = b; i < (src_height + b); i += 4) {
+ for (j = b; j < (src_width + b); j += 4) {
+ uint8 *ptr = src_y + (i * src_stride_y) + j;
+ int k, l;
+ for (k = 0; k < 4; ++k)
+ for (l = 0; l < 4; ++l)
+ ptr[k + src_stride_y * l] = block_data[k + 4 * l];
+ }
+ }
+
+ for (i = 1; i < 16; i++)
+ block_data[i] = (random() & 0xfe) + 1;
+
+ for (i = b; i < (src_height_uv + b); i += 4) {
+ for (j = b; j < (src_width_uv + b); j += 4) {
+ uint8 *ptru = src_u + (i * src_stride_uv) + j;
+ uint8 *ptrv = src_v + (i * src_stride_uv) + j;
+ int k, l;
+ for (k = 0; k < 4; ++k)
+ for (l = 0; l < 4; ++l) {
+ ptru[k + src_stride_uv * l] = block_data[k + 4 * l];
+ ptrv[k + src_stride_uv * l] = block_data[k + 4 * l];
+ }
+ }
+ }
+
+ int f;
+ int err = 0;
+
+ // currently three filter modes, defined as FilterMode in scale.h
+ for (f = 0; f < 3; ++f) {
+ I420Scale(src_y + (src_stride_y * b) + b, src_stride_y,
+ src_u + (src_stride_uv * b) + b, src_stride_uv,
+ src_v + (src_stride_uv * b) + b, src_stride_uv,
+ src_width, src_height,
+ dst_y + (dst_stride_y * b) + b, dst_stride_y,
+ dst_u + (dst_stride_uv * b) + b, dst_stride_uv,
+ dst_v + (dst_stride_uv * b) + b, dst_stride_uv,
+ dst_width, dst_height,
+ static_cast<FilterMode>(f));
+
+ int value = dst_y[(dst_stride_y * b) + b];
+
+ // catch the case that the output buffer is all 0
+ if (value == 0)
+ ++err;
+
+ for (i = b; i < (dst_height + b); ++i) {
+ for (j = b; j < (dst_width + b); ++j) {
+ if (value != dst_y[(i * dst_stride_y) + j])
+ ++err;
+ }
+ }
+
+ value = dst_u[(dst_stride_uv * b) + b];
+
+ if (value == 0)
+ ++err;
+
+ for (i = b; i < (dst_height_uv + b); ++i) {
+ for (j = b; j < (dst_width_uv + b); ++j) {
+ if (value != dst_u[(i * dst_stride_uv) + j])
+ ++err;
+ if (value != dst_v[(i * dst_stride_uv) + j])
+ ++err;
+ }
+ }
+ }
+
+ free_aligned_buffer_16(src_y)
+ free_aligned_buffer_16(src_u)
+ free_aligned_buffer_16(src_v)
+ free_aligned_buffer_16(dst_y)
+ free_aligned_buffer_16(dst_u)
+ free_aligned_buffer_16(dst_v)
+
+ EXPECT_EQ(0, err);
+}