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4963ce29fb
Depending on the current transform, Skia applies either subpixel rounding or integer rounding to different coordinate axes of the transformed glyph position. If we don't correctly predict which of these are applied, we may have aliased cache entries that round to the same value in DrawTargetWebgl but for which Skia under the hood rounds in entirely different directions. When this happens, glyphs can get hinted to the wrong direction. To fix this, we need to ensure that we appropriately apply either subpixel rounding or integer rounding in the same manner as Skia. Differential Revision: https://phabricator.services.mozilla.com/D149350
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#ifndef MOZILLA_GFX_SCALEDFONTWIN_H_
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#define MOZILLA_GFX_SCALEDFONTWIN_H_
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#include "ScaledFontBase.h"
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#include <windows.h>
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namespace mozilla {
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namespace gfx {
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class ScaledFontWin : public ScaledFontBase {
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public:
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MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(ScaledFontWin, override)
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ScaledFontWin(const LOGFONT* aFont, const RefPtr<UnscaledFont>& aUnscaledFont,
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Float aSize);
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FontType GetType() const override { return FontType::GDI; }
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bool GetFontInstanceData(FontInstanceDataOutput aCb, void* aBaton) override;
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AntialiasMode GetDefaultAAMode() override;
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SkTypeface* CreateSkTypeface() override;
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bool MayUseBitmaps() override { return true; }
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bool UseSubpixelPosition() const override { return false; }
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protected:
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cairo_font_face_t* CreateCairoFontFace(
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cairo_font_options_t* aFontOptions) override;
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private:
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friend class DrawTargetSkia;
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LOGFONT mLogFont;
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};
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} // namespace gfx
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} // namespace mozilla
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#endif /* MOZILLA_GFX_SCALEDFONTWIN_H_ */
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