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// Copyright 2023 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_util_win.h"
#include <windows.h>
#include <wrl/client.h>
#include "base/files/file_path.h"
#include "third_party/skia/include/core/SkSurfaceProps.h"
#include "third_party/skia/include/core/SkTypes.h"
#include "ui/base/ui_base_features.h"
#include "ui/gfx/win/direct_write.h"
namespace gfx {
namespace {
struct TextParameters {
float contrast;
float gamma;
};
TextParameters GetTextParameters() {
static TextParameters text_parameters;
static std::once_flag flag;
std::call_once(flag, [&] {
text_parameters.contrast = SK_GAMMA_CONTRAST;
text_parameters.gamma = SK_GAMMA_EXPONENT;
// Only apply values from `IDWriteRenderingParams` if the user has
// the appropriate registry keys set. Otherwise, `IDWriteRenderingParams`
// values will use DirectWrite's default values, which do no match Skia's
// defaults.
base::win::RegKey key = FontUtilWin::GetTextSettingsRegistryKey();
if (key.Valid()) {
Microsoft::WRL::ComPtr<IDWriteFactory> factory;
gfx::win::CreateDWriteFactory(&factory);
if (factory) {
// We only support the primary device currently.
Microsoft::WRL::ComPtr<IDWriteRenderingParams> text_params;
if (SUCCEEDED(factory->CreateRenderingParams(&text_params))) {
text_parameters.contrast =
FontUtilWin::ClampContrast(text_params->GetEnhancedContrast());
text_parameters.gamma =
FontUtilWin::ClampGamma(text_params->GetGamma());
}
}
}
});
return text_parameters;
}
} // namespace
// static
base::win::RegKey FontUtilWin::GetTextSettingsRegistryKey(REGSAM access) {
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();
return base::win::RegKey{
HKEY_CURRENT_USER,
(L"SOFTWARE\\Microsoft\\Avalon.Graphics\\" + trimmed.value()).c_str(),
access};
}
}
return base::win::RegKey{};
}
// static
float FontUtilWin::ClampContrast(float value) {
return std::clamp(value, SkSurfaceProps::kMinContrastInclusive,
SkSurfaceProps::kMaxContrastInclusive);
}
// static
float FontUtilWin::ClampGamma(float value) {
// Handle the exclusive max by subtracting espilon.
return std::clamp(value, SkSurfaceProps::kMinGammaInclusive,
SkSurfaceProps::kMaxGammaExclusive -
std::numeric_limits<float>::epsilon());
}
// static
float FontUtilWin::GetContrastFromRegistry() {
return GetTextParameters().contrast;
}
// static
float FontUtilWin::GetGammaFromRegistry() {
return GetTextParameters().gamma;
}
} // namespace gfx
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