Add scroll perf test for protocol in chromoting

remoting/test/frame_generator_util.cc

Index: remoting/test/frame_generator_util.cc
diff --git a/remoting/test/frame_generator_util.cc b/remoting/test/frame_generator_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c84115a482a8a24f4a8024169f95de0df1b48bff
--- /dev/null
+++ b/remoting/test/frame_generator_util.cc
@@ -0,0 +1,105 @@
+// Copyright 2016 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 "remoting/test/frame_generator_util.h"
+
+#include "base/base_paths.h"
+#include "base/files/file_util.h"
+#include "base/path_service.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
+#include "ui/gfx/codec/png_codec.h"
+
+namespace remoting {
+namespace test {
+
+namespace {
+const int kBarcodeCellWidth = 8;
+const int kBarcodeCellHeight = 8;
+const int kBarcodeBits = 10;
+const int kBarcodeBlackThreshold = 85;
+const int kBarcodeWhiteThreshold = 170;
+}  // namespace
+
+std::unique_ptr<webrtc::DesktopFrame> LoadDesktopFrameFromPng(
+    const char* name) {
+  base::FilePath file_path;
+  PathService::Get(base::DIR_SOURCE_ROOT, &file_path);
+  file_path = file_path.AppendASCII("remoting");
+  file_path = file_path.AppendASCII("test");
+  file_path = file_path.AppendASCII("data");
+  file_path = file_path.AppendASCII(name);
+
+  std::string file_content;
+  if (!base::ReadFileToString(file_path, &file_content))
+    LOG(FATAL) << "Failed to read " << file_path.MaybeAsASCII()
+               << ". Please run remoting/test/data/download.sh";
+  SkBitmap bitmap;
+  gfx::PNGCodec::Decode(reinterpret_cast<const uint8_t*>(file_content.data()),
+                        file_content.size(), &bitmap);
+  std::unique_ptr<webrtc::DesktopFrame> frame(new webrtc::BasicDesktopFrame(
+      webrtc::DesktopSize(bitmap.width(), bitmap.height())));
+  bitmap.copyPixelsTo(frame->data(),
+                      frame->stride() * frame->size().height(),
+                      frame->stride());
+  return frame;
+}
+
+void DrawRect(webrtc::DesktopFrame* frame,
+              webrtc::DesktopRect rect,
+              uint32_t color) {
+  for (int y = rect.top(); y < rect.bottom(); ++y) {
+    uint32_t* data = reinterpret_cast<uint32_t*>(
+        frame->GetFrameDataAtPos(webrtc::DesktopVector(rect.left(), y)));
+    for (int x = 0; x < rect.width(); ++x) {
+      data[x] = color;
+    }
+  }
+}
+
+void DrawBarcode(int value, bool changed, webrtc::DesktopFrame* frame) {
+  CHECK(value < (1 << kBarcodeBits));
+  for (int i = 0; i < kBarcodeBits; ++i) {
+    DrawRect(frame, webrtc::DesktopRect::MakeXYWH(i * kBarcodeCellWidth, 0,
+                                                  kBarcodeCellWidth,
+                                                  kBarcodeCellHeight),
+             (value & 1) ? 0xffffffff : 0xff000000);
+    value >>= 1;
+  }
+  if (changed) {
+    frame->mutable_updated_region()->AddRect(webrtc::DesktopRect::MakeXYWH(
+        0, 0, kBarcodeCellWidth * kBarcodeBits, kBarcodeCellHeight));
+  }
+}
+
+int ReadBarcode(const webrtc::DesktopFrame& frame) {
+  int result = 0;
+  for (int i = kBarcodeBits - 1; i >= 0; --i) {
+    // Sample barcode in the center of the cell for each bit.
+    int x = i * kBarcodeCellWidth + kBarcodeCellWidth / 2;
+    int y = kBarcodeCellHeight / 2;
+    uint8_t* data = frame.GetFrameDataAtPos(webrtc::DesktopVector(x, y));
+    int b = data[0];
+    int g = data[1];
+    int r = data[2];
+    bool bit = 0;
+    if (b > kBarcodeWhiteThreshold && g > kBarcodeWhiteThreshold &&
+        r > kBarcodeWhiteThreshold) {
+      bit = 1;
+    } else if (b < kBarcodeBlackThreshold && g < kBarcodeBlackThreshold &&
+        r < kBarcodeBlackThreshold) {
+      bit = 0;
+    } else {
+      LOG(FATAL) << "Invalid barcode.";
+    }
+    result <<= 1;
+    if (bit)
+      result |= 1;
+  }
+  return result;
+}
+
+}  // namespace test
+}  // namespace remoting