Benchmark tool for GPU-accelerated video rendering

media/tools/shader_bench/window_win.cc

+// Copyright (c) 2010 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 "media/tools/shader_bench/window.h"
+
+namespace {
+
+LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg,
+                            WPARAM w_param, LPARAM l_param) {
+  LRESULT result = 0;
+  switch (msg) {
+    case WM_CLOSE:
+      ::DestroyWindow(hwnd);
+      break;
+    case WM_DESTROY:
+      ::PostQuitMessage(0);
+      break;
+    case WM_ERASEBKGND:
+      // Return a non-zero value to indicate that the background has been
+      // erased.
+      result = 1;
+      break;
+    case WM_PAINT: {
+      media::Window* window =
+          reinterpret_cast<media::Window*>(
+              GetWindowLongPtr(hwnd, GWL_USERDATA));
+      if (window != NULL) window->OnPaint();
+      ::ValidateRect(hwnd, NULL);
+      break;
+    }
+    default:
+      result = ::DefWindowProc(hwnd, msg, w_param, l_param);
+      break;
+  }
+  return result;
+}
+
+}  // namespace
+
+namespace media {
+
+gfx::NativeWindow Window::CreateNativeWindow(int width, int height) {
+  WNDCLASS wnd_class = {0};
+  HINSTANCE instance = GetModuleHandle(NULL);
+  wnd_class.style = CS_OWNDC;
+  wnd_class.lpfnWndProc = WindowProc;
+  wnd_class.hInstance = instance;
+  wnd_class.hbrBackground =
+      reinterpret_cast<HBRUSH>(GetStockObject(BLACK_BRUSH));
+  wnd_class.lpszClassName = L"gpu_demo";
+  if (!RegisterClass(&wnd_class)) return NULL;
+
+  DWORD wnd_style = WS_OVERLAPPED | WS_SYSMENU;
+  RECT wnd_rect;
+  wnd_rect.left = 0;
+  wnd_rect.top = 0;
+  wnd_rect.right = width;
+  wnd_rect.bottom = height;
+  AdjustWindowRect(&wnd_rect, wnd_style, FALSE);
+
+  HWND hwnd = CreateWindow(
+      wnd_class.lpszClassName,
+      L"",
+      wnd_style,
+      0,
+      0,
+      wnd_rect.right - wnd_rect.left,
+      wnd_rect.bottom - wnd_rect.top,
+      NULL,
+      NULL,
+      instance,
+      NULL);
+  if (hwnd == NULL) return NULL;
+
+  return hwnd;
+}
+
+gfx::PluginWindowHandle Window::PluginWindow() {
+  return window_handle_;
+}
+
+void Window::Start(int limit, Task* done_task, Painter* painter) {
+  running_ = true;
+  count_ = 0;
+  limit_ = limit;
+  done_task_ = done_task;
+  painter_ = painter;
+
+  SetWindowLongPtr(window_handle_, GWL_USERDATA,
+                   reinterpret_cast<LONG_PTR>(this));
+
+  ShowWindow(window_handle_, SW_SHOWNORMAL);
+
+  // Post first invalidate call to kick off painting.
+  ::InvalidateRect(window_handle_, NULL, FALSE);
+
+  MainLoop();
+}
+
+void Window::OnPaint() {
+  if (!running_)
+    return;
+
+  if (count_ < limit_) {
+    painter_->OnPaint();
+    count_++;
+  } else {
+    running_ = false;
+    if (done_task_) {
+      ShowWindow(window_handle_, SW_HIDE);
+      done_task_->Run();
+      delete done_task_;
+    }
+  }
+}
+
+void Window::MainLoop() {
+  MSG msg;
+  bool done = false;
+  while (!done) {
+    while (::PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
+      if (msg.message == WM_QUIT || !running_)
+        done = true;
+      ::TranslateMessage(&msg);
+      ::DispatchMessage(&msg);
+      if (!done)
+        ::InvalidateRect(window_handle_, NULL, FALSE);
+    }
+  }
+}
+
+} // namespace media