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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 <memory>
- #include "base/bind.h"
- #include "base/callback_helpers.h"
- #include "base/files/file_path.h"
- #include "base/memory/singleton.h"
- #include "base/win/registry.h"
- #include "ui/gfx/win/singleton_hwnd_observer.h"
- namespace gfx {
- namespace {
- FontRenderParams::SubpixelRendering GetSubpixelRenderingGeometry() {
- DISPLAY_DEVICE display_device = {sizeof(DISPLAY_DEVICE)};
- for (int i = 0; EnumDisplayDevices(nullptr, i, &display_device, 0); ++i) {
- // TODO(scottmg): We only support the primary device currently.
- if (display_device.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE) {
- base::FilePath trimmed =
- base::FilePath(display_device.DeviceName).BaseName();
- base::win::RegKey key(
- HKEY_LOCAL_MACHINE,
- (L"SOFTWARE\\Microsoft\\Avalon.Graphics\\" + trimmed.value()).c_str(),
- KEY_READ);
- DWORD structure;
- if (key.ReadValueDW(L"PixelStructure", &structure) == ERROR_SUCCESS) {
- switch (structure) {
- case 0:
- return FontRenderParams::SUBPIXEL_RENDERING_NONE;
- case 1:
- return FontRenderParams::SUBPIXEL_RENDERING_RGB;
- case 2:
- return FontRenderParams::SUBPIXEL_RENDERING_BGR;
- }
- return FontRenderParams::SUBPIXEL_RENDERING_NONE;
- }
- break;
- }
- }
- UINT structure = 0;
- if (SystemParametersInfo(SPI_GETFONTSMOOTHINGORIENTATION, 0, &structure, 0)) {
- switch (structure) {
- case FE_FONTSMOOTHINGORIENTATIONRGB:
- return FontRenderParams::SUBPIXEL_RENDERING_RGB;
- case FE_FONTSMOOTHINGORIENTATIONBGR:
- return FontRenderParams::SUBPIXEL_RENDERING_BGR;
- }
- }
- // No explicit ClearType settings, default to none.
- return FontRenderParams::SUBPIXEL_RENDERING_NONE;
- }
- // Caches font render params and updates them on system notifications.
- class CachedFontRenderParams {
- public:
- static CachedFontRenderParams* GetInstance() {
- return base::Singleton<CachedFontRenderParams>::get();
- }
- CachedFontRenderParams(const CachedFontRenderParams&) = delete;
- CachedFontRenderParams& operator=(const CachedFontRenderParams&) = delete;
- const FontRenderParams& GetParams() {
- if (params_)
- return *params_;
- params_ = std::make_unique<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 = GetSubpixelRenderingGeometry();
- }
- }
- singleton_hwnd_observer_ =
- std::make_unique<SingletonHwndObserver>(base::BindRepeating(
- &CachedFontRenderParams::OnWndProc, base::Unretained(this)));
- return *params_;
- }
- private:
- friend struct base::DefaultSingletonTraits<CachedFontRenderParams>;
- CachedFontRenderParams() {}
- ~CachedFontRenderParams() {}
- void OnWndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
- if (message == WM_SETTINGCHANGE) {
- // TODO(khushalsagar): This should trigger an update to the
- // renderer and gpu processes, where the params are cached.
- params_.reset();
- singleton_hwnd_observer_.reset(nullptr);
- }
- }
- std::unique_ptr<FontRenderParams> params_;
- std::unique_ptr<SingletonHwndObserver> singleton_hwnd_observer_;
- };
- } // 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();
- }
- float GetFontRenderParamsDeviceScaleFactor() {
- return 1.;
- }
- } // namespace gfx
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