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-rw-r--r--gfx/2d/HelpersWinFonts.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/gfx/2d/HelpersWinFonts.h b/gfx/2d/HelpersWinFonts.h
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+++ b/gfx/2d/HelpersWinFonts.h
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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