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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
namespace mozilla {
namespace gfx {
// Cleartype can be dynamically enabled/disabled, so we have to check it
// everytime we want to render some text.
static BYTE
GetSystemTextQuality()
{
BOOL font_smoothing;
UINT smoothing_type;
if (!SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &font_smoothing, 0)) {
return DEFAULT_QUALITY;
}
if (font_smoothing) {
if (!SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE,
0, &smoothing_type, 0)) {
return DEFAULT_QUALITY;
}
if (smoothing_type == FE_FONTSMOOTHINGCLEARTYPE) {
return CLEARTYPE_QUALITY;
}
return ANTIALIASED_QUALITY;
}
return DEFAULT_QUALITY;
}
static AntialiasMode
GetSystemDefaultAAMode()
{
AntialiasMode defaultMode = AntialiasMode::SUBPIXEL;
if (gfxPrefs::DisableAllTextAA()) {
return AntialiasMode::NONE;
}
switch (GetSystemTextQuality()) {
case CLEARTYPE_QUALITY:
defaultMode = AntialiasMode::SUBPIXEL;
break;
case ANTIALIASED_QUALITY:
defaultMode = AntialiasMode::GRAY;
break;
case DEFAULT_QUALITY:
defaultMode = AntialiasMode::NONE;
break;
}
return defaultMode;
}
} // namespace gfx
} // namespace mozilla
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