Add base::Chrono class.

src/base/CMakeLists.txt

@@ -14,6 +14,7 @@ if(HAVE_SCHED_YIELD)
 endif()
 
 add_library(base-lib
+  chrono.cpp
   convert_to.cpp
   errno_string.cpp
   exception.cpp

src/base/chrono.cpp

@@ -0,0 +1,34 @@
+// ASEPRITE base library
+// Copyright (C) 2001-2012  David Capello
+//
+// This source file is ditributed under a BSD-like license, please
+// read LICENSE.txt for more information.
+
+#include "config.h"
+
+#include "base/chrono.h"
+
+#ifdef _WIN32
+  #include "base/chrono_win32.h"
+#else
+  #include "base/chrono_unix.h"
+#endif
+
+namespace base {
+
+  Chrono::Chrono() : m_impl(new ChronoImpl) {
+  }
+
+  Chrono::~Chrono() {
+    delete m_impl;
+  }
+
+  void Chrono::reset() {
+    m_impl->reset();
+  }
+
+  double Chrono::elapsed() const {
+    return m_impl->elapsed();
+  }
+
+} // namespace base

src/base/chrono.h

@@ -0,0 +1,26 @@
+// ASEPRITE base library
+// Copyright (C) 2001-2012  David Capello
+//
+// This source file is ditributed under a BSD-like license, please
+// read LICENSE.txt for more information.
+
+#ifndef BASE_CHRONO_H_INCLUDED
+#define BASE_CHRONO_H_INCLUDED
+
+namespace base {
+
+  class Chrono {
+  public:
+    Chrono();
+    ~Chrono();
+    void reset();
+    double elapsed() const;
+
+  private:
+    class ChronoImpl;
+    ChronoImpl* m_impl;
+  };
+
+} // namespace base
+
+#endif // BASE_CHRONO_H_INCLUDED

src/base/chrono_unix.h

@@ -0,0 +1,29 @@
+// ASEPRITE base library
+// Copyright (C) 2001-2012  David Capello
+//
+// This source file is ditributed under a BSD-like license, please
+// read LICENSE.txt for more information.
+
+#include <time.h>
+#include <sys/time.h>
+
+class base::Chrono::ChronoImpl {
+public:
+  ChronoImpl() {
+    reset();
+  }
+
+  void reset() {
+    gettimeofday(&m_point, NULL);
+  }
+
+  double elapsed() const {
+    struct timeval now;
+    gettimeofday(&now, NULL);
+    return (double)(now.tv_sec + (double)now.tv_usec/1000000) -
+           (double)(m_point.tv_sec + (double)m_point.tv_usec/1000000);
+  }
+
+private:
+  struct timeval m_point;
+};

src/base/chrono_win32.h

@@ -0,0 +1,31 @@
+// ASEPRITE base library
+// Copyright (C) 2001-2012  David Capello
+//
+// This source file is ditributed under a BSD-like license, please
+// read LICENSE.txt for more information.
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+class base::Chrono::ChronoImpl {
+public:
+  ChronoImpl() {
+    QueryPerformanceFrequency(&m_freq);
+    reset();
+  }
+
+  void reset() {
+    QueryPerformanceCounter(&m_point);
+  }
+
+  double elapsed() const {
+    LARGE_INTEGER now;
+    QueryPerformanceCounter(&now);
+    return static_cast<double>(now.QuadPart - m_point.QuadPart)
+         / static_cast<double>(m_freq.QuadPart);
+  }
+
+private:
+  LARGE_INTEGER m_point;
+  LARGE_INTEGER m_freq;
+};