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