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// Copyright 2014 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/gfx/font_render_params.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "ui/gfx/win/direct_write.h"
#include "ui/gfx/win/singleton_hwnd.h"
namespace gfx {
namespace {
// Caches font render params and updates them on system notifications.
class CachedFontRenderParams : public gfx::SingletonHwnd::Observer {
public:
static CachedFontRenderParams* GetInstance() {
return Singleton<CachedFontRenderParams>::get();
}
const FontRenderParams& GetParams() {
if (params_)
return *params_;
params_.reset(new FontRenderParams());
params_->antialiasing = false;
params_->subpixel_positioning = false;
params_->autohinter = false;
params_->use_bitmaps = false;
params_->hinting = FontRenderParams::HINTING_MEDIUM;
params_->subpixel_rendering = FontRenderParams::SUBPIXEL_RENDERING_NONE;
BOOL enabled = false;
if (SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &enabled, 0) && enabled) {
params_->antialiasing = true;
// GDI does not support subpixel positioning.
params_->subpixel_positioning = win::IsDirectWriteEnabled();
UINT type = 0;
if (SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE, 0, &type, 0) &&
type == FE_FONTSMOOTHINGCLEARTYPE) {
params_->subpixel_rendering = FontRenderParams::SUBPIXEL_RENDERING_RGB;
}
}
gfx::SingletonHwnd::GetInstance()->AddObserver(this);
return *params_;
}
private:
friend struct DefaultSingletonTraits<CachedFontRenderParams>;
CachedFontRenderParams() {}
virtual ~CachedFontRenderParams() {
// Can't remove the SingletonHwnd observer here since SingletonHwnd may have
// been destroyed already (both singletons).
}
virtual void OnWndProc(HWND hwnd,
UINT message,
WPARAM wparam,
LPARAM lparam) override {
if (message == WM_SETTINGCHANGE) {
params_.reset();
gfx::SingletonHwnd::GetInstance()->RemoveObserver(this);
}
}
scoped_ptr<FontRenderParams> params_;
DISALLOW_COPY_AND_ASSIGN(CachedFontRenderParams);
};
} // namespace
FontRenderParams GetFontRenderParams(const FontRenderParamsQuery& query,
std::string* family_out) {
if (family_out)
NOTIMPLEMENTED();
// Customized font rendering settings are not supported, only defaults.
return CachedFontRenderParams::GetInstance()->GetParams();
}
} // namespace gfx
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