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In MathML Core, the recommendation is to directly use the proper character from the Mathematical Alphanumeric Symbols instead of the mathvariant attribute. The exception is for automatic italicization on single-char `<mi>` element. This is implemented via a new text-transform value "math-auto" [1] which is the default on the `<mi>` element. The mathvariant attribute is now restricted to that element and to value "normal" in order to force upright text instead [2]. This CL implements this restriction together with that new text-transform value under the mathml.legacy_mathvariant_attribute.disabled flag. Some legacy MathML cases where math-auto alone does not work are still handled via MathMLTextRunFactory. [1] https://w3c.github.io/mathml-core/#new-text-transform-values [2] https://w3c.github.io/mathml-core/#the-mathvariant-attribute Differential Revision: https://phabricator.services.mozilla.com/D172395
46 lines
1.7 KiB
C++
46 lines
1.7 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 MATHMLTEXTRUNFACTORY_H_
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#define MATHMLTEXTRUNFACTORY_H_
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#include "mozilla/UniquePtr.h"
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#include "nsTextRunTransformations.h"
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/**
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* Builds textruns that render their text with MathML specific renderings.
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*/
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class MathMLTextRunFactory : public nsTransformingTextRunFactory {
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public:
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MathMLTextRunFactory(mozilla::UniquePtr<nsTransformingTextRunFactory>
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aInnerTransformingTextRunFactory,
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uint32_t aFlags, uint8_t aSSTYScriptLevel,
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float aFontInflation)
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: mInnerTransformingTextRunFactory(
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std::move(aInnerTransformingTextRunFactory)),
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mFlags(aFlags),
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mFontInflation(aFontInflation),
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mSSTYScriptLevel(aSSTYScriptLevel) {}
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static uint32_t MathVariant(uint32_t aCh, mozilla::StyleMathVariant aMathVar);
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virtual void RebuildTextRun(nsTransformedTextRun* aTextRun,
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mozilla::gfx::DrawTarget* aRefDrawTarget,
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gfxMissingFontRecorder* aMFR) override;
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enum {
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// Style effects which may override single character <mi> behaviour
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MATH_FONT_FEATURE_DTLS = 0x4, // font feature dtls should be set
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};
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protected:
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mozilla::UniquePtr<nsTransformingTextRunFactory>
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mInnerTransformingTextRunFactory;
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uint32_t mFlags;
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float mFontInflation;
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uint8_t mSSTYScriptLevel;
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};
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#endif /*MATHMLTEXTRUNFACTORY_H_*/
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