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// Copyright 2014 The Chromium Authors
// 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/feature_list.h"
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/singleton.h"
#include "base/win/registry.h"
#include "skia/ext/legacy_display_globals.h"
#include "ui/base/ui_base_features.h"
#include "ui/gfx/font_util_win.h"
#include "ui/gfx/win/singleton_hwnd_observer.h"
namespace gfx {
namespace {
FontRenderParams::SubpixelRendering GetSubpixelRenderingGeometry() {
DWORD pixel_structure;
base::win::RegKey key = FontUtilWin::GetTextSettingsRegistryKey();
if (key.Valid() &&
key.ReadValueDW(L"PixelStructure", &pixel_structure) == ERROR_SUCCESS) {
switch (pixel_structure) {
case 0:
return FontRenderParams::SUBPIXEL_RENDERING_NONE;
case 1:
return FontRenderParams::SUBPIXEL_RENDERING_RGB;
case 2:
return FontRenderParams::SUBPIXEL_RENDERING_BGR;
}
// TODO(kschmi): Determine usage of this fallback and remove if it's not
// hit.
return FontRenderParams::SUBPIXEL_RENDERING_NONE;
}
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();
}
}
if (base::FeatureList::IsEnabled(
features::kUseGammaContrastRegistrySettings)) {
params_->text_contrast = FontUtilWin::GetContrastFromRegistry();
params_->text_gamma = FontUtilWin::GetGammaFromRegistry();
} else {
params_->text_contrast = SK_GAMMA_CONTRAST;
params_->text_gamma = SK_GAMMA_EXPONENT;
}
skia::LegacyDisplayGlobals::SetCachedParams(
FontRenderParams::SubpixelRenderingToSkiaPixelGeometry(
params_->subpixel_rendering),
params_->text_contrast, params_->text_gamma);
singleton_hwnd_observer_ =
std::make_unique<SingletonHwndObserver>(base::BindRepeating(
&CachedFontRenderParams::OnWndProc, base::Unretained(this)));
return *params_;
}
void Reset() {
params_.reset();
singleton_hwnd_observer_.reset(nullptr);
}
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();
}
void ClearFontRenderParamsCacheForTest() {
CachedFontRenderParams::GetInstance()->Reset();
}
float GetFontRenderParamsDeviceScaleFactor() {
return 1.;
}
} // namespace gfx
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