Introducing a helper wrapper for YUV-to-RGB convertion and/or scaling.

remoting/base/util_unittest.cc

Index: remoting/base/util_unittest.cc
diff --git a/remoting/base/util_unittest.cc b/remoting/base/util_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..24e628daf19064d66e36df7391626a4609dbda28
--- /dev/null
+++ b/remoting/base/util_unittest.cc
@@ -0,0 +1,187 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <algorithm>
+
+#include "remoting/base/util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkRect.h"
+#include "third_party/skia/include/core/SkSize.h"
+
+static const int kWidth = 32 ;
+static const int kHeight = 24 ;
+static const int kBytesPerPixel = 4;
+static const int kYStride = kWidth;
+static const int kUvStride = kWidth / 2;
+static const int kRgbStride = kWidth * kBytesPerPixel;
+static const uint32 kFillColor = 0xffffff;
+
+namespace remoting {
+
+class YuvToRgbTester {
+ public:
+  YuvToRgbTester() {
+    yuv_buffer_size_ = (kYStride + kUvStride) * kHeight;
+    yuv_buffer_.reset(new uint8[yuv_buffer_size_]);
+    yplane_ = yuv_buffer_.get();
+    uplane_ = yplane_ + (kYStride * kHeight);
+    vplane_ = uplane_ + (kUvStride * kHeight / 2);
+
+    rgb_buffer_size_ = kWidth * kHeight * kBytesPerPixel;
+    rgb_buffer_.reset(new uint8[rgb_buffer_size_]);
+
+    ResetYuvBuffer();
+    ResetRgbBuffer();
+  }
+
+  ~YuvToRgbTester() {}
+
+  void ResetYuvBuffer() {
+    memset(yuv_buffer_.get(), 0, yuv_buffer_size_);
+  }
+
+  void ResetRgbBuffer() {
+    memset(rgb_buffer_.get(), 0, rgb_buffer_size_);
+  }
+
+  void FillRgbBuffer(const SkIRect& rect) {
+    uint32* ptr = reinterpret_cast<uint32*>(
+        rgb_buffer_.get() + (rect.top() * kRgbStride) +
+        (rect.left() * kBytesPerPixel));
+    int width = rect.width();
+    for (int height = rect.height(); height > 0; --height) {
+      std::fill(ptr, ptr + width, kFillColor);
+      ptr += kRgbStride / kBytesPerPixel;
+    }
+  }
+
+  // Check the the desination buffer is filled within expected bounds.
+  void  CheckRgbBuffer(const SkIRect& rect) {
+    uint32* ptr = reinterpret_cast<uint32*>(rgb_buffer_.get());
+    for (int y = 0; y < kHeight; ++y) {
+      if (y < rect.top() || rect.bottom() <= y) {
+        // The whole line should be intact.
+        EXPECT_EQ((ptrdiff_t)kWidth,
+                  std::count(ptr, ptr + kWidth, 0u));
+      } else {
+        // The space before the painted rectangle should be intact.
+        EXPECT_EQ((ptrdiff_t)rect.left(),
+                  std::count(ptr, ptr + rect.left(), 0u));
+
+        // All pixels of the target rectangle should be touched.
+        EXPECT_EQ(ptr + rect.right(),
+                  std::find(ptr + rect.left(), ptr + rect.right(), 0u));
+
+        // The space after the painted rectangle should be intact.
+        EXPECT_EQ((ptrdiff_t)kWidth - rect.right(),
+                  std::count(ptr + rect.right(), ptr + kWidth, 0u));
+      }
+      ptr += kRgbStride / kBytesPerPixel;
+    }
+  }
+
+  void RunTest(const SkISize dest_size, const SkIRect& rect) {
+    ASSERT_TRUE(SkIRect::MakeSize(dest_size).contains(rect));
+
+    // Reset buffers.
+    ResetYuvBuffer();
+    ResetRgbBuffer();
+    FillRgbBuffer(rect);
+
+    // RGB -> YUV
+    ConvertRGB32ToYUVWithRect(rgb_buffer_.get(),
+                              yplane_,
+                              uplane_,
+                              vplane_,
+                              0,
+                              0,
+                              kWidth,
+                              kHeight,
+                              kRgbStride,
+                              kYStride,
+                              kUvStride);
+
+    // Reset RGB buffer and do opposite conversion.
+    ResetRgbBuffer();
+    ConvertAndScaleYUVToRGB32Rect(yplane_,
+                                  uplane_,
+                                  vplane_,
+                                  kYStride,
+                                  kUvStride,
+                                  SkISize::Make(kWidth, kHeight),
+                                  SkIRect::MakeWH(kWidth, kHeight),
+                                  rgb_buffer_.get(),
+                                  kRgbStride,
+                                  dest_size,
+                                  SkIRect::MakeSize(dest_size),
+                                  rect);
+
+    // Check if it worked out.
+    CheckRgbBuffer(rect);
+  }
+
+  void TestBasicConversion() {
+    // Whole buffer.
+    RunTest(SkISize::Make(kWidth, kHeight), SkIRect::MakeWH(kWidth, kHeight));
+  }
+
+ private:
+  size_t yuv_buffer_size_;
+  scoped_array<uint8> yuv_buffer_;
+  uint8* yplane_;
+  uint8* uplane_;
+  uint8* vplane_;
+
+  size_t rgb_buffer_size_;
+  scoped_array<uint8> rgb_buffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(YuvToRgbTester);
+};
+
+TEST(YuvToRgbTest, BasicConversion) {
+  YuvToRgbTester tester;
+  tester.TestBasicConversion();
+}
+
+TEST(YuvToRgbTest, Clipping) {
+  YuvToRgbTester tester;
+
+  SkISize dest_size = SkISize::Make(kWidth, kHeight);
+  SkIRect rect = SkIRect::MakeLTRB(0, 0, kWidth - 1, kHeight - 1);
+  for (int i = 0; i < 16; ++i) {
+    SkIRect dest_rect = rect;
+    if ((i & 1) != 0)
+      dest_rect.fLeft += 1;
+    if ((i & 2) != 0)
+      dest_rect.fTop += 1;
+    if ((i & 4) != 0)
+      dest_rect.fRight += 1;
+    if ((i & 8) != 0)
+      dest_rect.fBottom += 1;
+
+    tester.RunTest(dest_size, dest_rect);
+  }
+}
+
+TEST(YuvToRgbTest, ClippingAndScaling) {
+  YuvToRgbTester tester;
+
+  SkISize dest_size = SkISize::Make(kWidth - 10, kHeight - 10);
+  SkIRect rect = SkIRect::MakeLTRB(5, 5, kWidth - 11, kHeight - 11);
+  for (int i = 0; i < 16; ++i) {
+    SkIRect dest_rect = rect;
+    if ((i & 1) != 0)
+      dest_rect.fLeft += 1;
+    if ((i & 2) != 0)
+      dest_rect.fTop += 1;
+    if ((i & 4) != 0)
+      dest_rect.fRight += 1;
+    if ((i & 8) != 0)
+      dest_rect.fBottom += 1;
+
+    tester.RunTest(dest_size, dest_rect);
+  }
+}
+
+}  // namespace remoting