| // 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/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; |
| params_->subpixel_positioning = true; |
| |
| 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) { |
| // Customized font rendering settings are not supported, only defaults. |
| if (!query.is_empty() || family_out) |
| NOTIMPLEMENTED(); |
| return CachedFontRenderParams::GetInstance()->GetParams(); |
| } |
| |
| } // namespace gfx |