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// 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 "ui/base/win/dpi.h"
#include <windows.h>
#include "base/win/scoped_hdc.h"
namespace {
int kDefaultDPIX = 96;
int kDefaultDPIY = 96;
} // namespace
namespace ui {
gfx::Size GetDPI() {
static int dpi_x = 0;
static int dpi_y = 0;
static bool should_initialize = true;
if (should_initialize) {
should_initialize = false;
base::win::ScopedGetDC screen_dc(NULL);
// This value is safe to cache for the life time of the app since the
// user must logout to change the DPI setting. This value also applies
// to all screens.
dpi_x = GetDeviceCaps(screen_dc, LOGPIXELSX);
dpi_y = GetDeviceCaps(screen_dc, LOGPIXELSY);
}
return gfx::Size(dpi_x, dpi_y);
}
float GetDPIScale() {
return static_cast<float>(GetDPI().width()) /
static_cast<float>(kDefaultDPIX);
}
bool IsInHighDPIMode() {
gfx::Size dpi(GetDPI());
return dpi.width() > kDefaultDPIX || dpi.height() > kDefaultDPIY;
}
void EnableHighDPISupport() {
typedef BOOL(WINAPI *SetProcessDPIAwarePtr)(VOID);
SetProcessDPIAwarePtr set_process_dpi_aware_func =
reinterpret_cast<SetProcessDPIAwarePtr>(
GetProcAddress(GetModuleHandleA("user32.dll"), "SetProcessDPIAware"));
if (set_process_dpi_aware_func)
set_process_dpi_aware_func();
}
} // namespace ui
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