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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /layout/generic/nsTextRunTransformations.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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diff --git a/layout/generic/nsTextRunTransformations.h b/layout/generic/nsTextRunTransformations.h
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+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#ifndef NSTEXTRUNTRANSFORMATIONS_H_
+#define NSTEXTRUNTRANSFORMATIONS_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/UniquePtr.h"
+#include "gfxTextRun.h"
+#include "nsStyleContext.h"
+
+class nsTransformedTextRun;
+
+struct nsTransformedCharStyle final {
+ NS_INLINE_DECL_REFCOUNTING(nsTransformedCharStyle)
+
+ explicit nsTransformedCharStyle(nsStyleContext* aContext)
+ : mFont(aContext->StyleFont()->mFont)
+ , mLanguage(aContext->StyleFont()->mLanguage)
+ , mPresContext(aContext->PresContext())
+ , mScriptSizeMultiplier(aContext->StyleFont()->mScriptSizeMultiplier)
+ , mTextTransform(aContext->StyleText()->mTextTransform)
+ , mMathVariant(aContext->StyleFont()->mMathVariant)
+ , mExplicitLanguage(aContext->StyleFont()->mExplicitLanguage) {}
+
+ nsFont mFont;
+ nsCOMPtr<nsIAtom> mLanguage;
+ RefPtr<nsPresContext> mPresContext;
+ float mScriptSizeMultiplier;
+ uint8_t mTextTransform;
+ uint8_t mMathVariant;
+ bool mExplicitLanguage;
+ bool mForceNonFullWidth = false;
+
+private:
+ ~nsTransformedCharStyle() {}
+ nsTransformedCharStyle(const nsTransformedCharStyle& aOther) = delete;
+ nsTransformedCharStyle& operator=(const nsTransformedCharStyle& aOther) = delete;
+};
+
+class nsTransformingTextRunFactory {
+public:
+ virtual ~nsTransformingTextRunFactory() {}
+
+ // Default 8-bit path just transforms to Unicode and takes that path
+ already_AddRefed<nsTransformedTextRun>
+ MakeTextRun(const uint8_t* aString, uint32_t aLength,
+ const gfxFontGroup::Parameters* aParams,
+ gfxFontGroup* aFontGroup, uint32_t aFlags,
+ nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles,
+ bool aOwnsFactory);
+
+ already_AddRefed<nsTransformedTextRun>
+ MakeTextRun(const char16_t* aString, uint32_t aLength,
+ const gfxFontGroup::Parameters* aParams,
+ gfxFontGroup* aFontGroup, uint32_t aFlags,
+ nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles,
+ bool aOwnsFactory);
+
+ virtual void RebuildTextRun(nsTransformedTextRun* aTextRun,
+ mozilla::gfx::DrawTarget* aRefDrawTarget,
+ gfxMissingFontRecorder* aMFR) = 0;
+};
+
+/**
+ * Builds textruns that transform the text in some way (e.g., capitalize)
+ * and then render the text using some other textrun implementation.
+ */
+class nsCaseTransformTextRunFactory : public nsTransformingTextRunFactory {
+public:
+ // We could add an optimization here so that when there is no inner
+ // factory, no title-case conversion, and no upper-casing of SZLIG, we override
+ // MakeTextRun (after making it virtual in the superclass) and have it
+ // just convert the string to uppercase or lowercase and create the textrun
+ // via the fontgroup.
+
+ // Takes ownership of aInnerTransformTextRunFactory
+ explicit nsCaseTransformTextRunFactory(UniquePtr<nsTransformingTextRunFactory> aInnerTransformingTextRunFactory,
+ bool aAllUppercase = false)
+ : mInnerTransformingTextRunFactory(Move(aInnerTransformingTextRunFactory)),
+ mAllUppercase(aAllUppercase) {}
+
+ virtual void RebuildTextRun(nsTransformedTextRun* aTextRun,
+ mozilla::gfx::DrawTarget* aRefDrawTarget,
+ gfxMissingFontRecorder* aMFR) override;
+
+ // Perform a transformation on the given string, writing the result into
+ // aConvertedString. If aAllUppercase is true, the transform is (global)
+ // upper-casing, and aLanguage is used to determine any language-specific
+ // behavior; otherwise, an nsTransformedTextRun should be passed in
+ // as aTextRun and its styles will be used to determine the transform(s)
+ // to be applied.
+ // If such an input textrun is provided, then its line-breaks and styles
+ // will be copied to the output arrays, which must also be provided by
+ // the caller. For the global upper-casing usage (no input textrun),
+ // these are ignored.
+ static bool TransformString(const nsAString& aString,
+ nsString& aConvertedString,
+ bool aAllUppercase,
+ const nsIAtom* aLanguage,
+ nsTArray<bool>& aCharsToMergeArray,
+ nsTArray<bool>& aDeletedCharsArray,
+ const nsTransformedTextRun* aTextRun = nullptr,
+ uint32_t aOffsetInTextRun = 0,
+ nsTArray<uint8_t>* aCanBreakBeforeArray = nullptr,
+ nsTArray<RefPtr<nsTransformedCharStyle>>* aStyleArray = nullptr);
+
+protected:
+ mozilla::UniquePtr<nsTransformingTextRunFactory> mInnerTransformingTextRunFactory;
+ bool mAllUppercase;
+};
+
+/**
+ * So that we can reshape as necessary, we store enough information
+ * to fully rebuild the textrun contents.
+ */
+class nsTransformedTextRun final : public gfxTextRun {
+public:
+
+ static already_AddRefed<nsTransformedTextRun>
+ Create(const gfxTextRunFactory::Parameters* aParams,
+ nsTransformingTextRunFactory* aFactory,
+ gfxFontGroup* aFontGroup,
+ const char16_t* aString, uint32_t aLength,
+ const uint32_t aFlags,
+ nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles,
+ bool aOwnsFactory);
+
+ ~nsTransformedTextRun() {
+ if (mOwnsFactory) {
+ delete mFactory;
+ }
+ }
+
+ void SetCapitalization(uint32_t aStart, uint32_t aLength,
+ bool* aCapitalization);
+ virtual bool SetPotentialLineBreaks(Range aRange,
+ const uint8_t* aBreakBefore);
+ /**
+ * Called after SetCapitalization and SetPotentialLineBreaks
+ * are done and before we request any data from the textrun. Also always
+ * called after a Create.
+ */
+ void FinishSettingProperties(mozilla::gfx::DrawTarget* aRefDrawTarget,
+ gfxMissingFontRecorder* aMFR)
+ {
+ if (mNeedsRebuild) {
+ mNeedsRebuild = false;
+ mFactory->RebuildTextRun(this, aRefDrawTarget, aMFR);
+ }
+ }
+
+ // override the gfxTextRun impls to account for additional members here
+ virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) MOZ_MUST_OVERRIDE;
+ virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) MOZ_MUST_OVERRIDE;
+
+ nsTransformingTextRunFactory *mFactory;
+ nsTArray<RefPtr<nsTransformedCharStyle>> mStyles;
+ nsTArray<bool> mCapitalize;
+ nsString mString;
+ bool mOwnsFactory;
+ bool mNeedsRebuild;
+
+private:
+ nsTransformedTextRun(const gfxTextRunFactory::Parameters* aParams,
+ nsTransformingTextRunFactory* aFactory,
+ gfxFontGroup* aFontGroup,
+ const char16_t* aString, uint32_t aLength,
+ const uint32_t aFlags,
+ nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles,
+ bool aOwnsFactory)
+ : gfxTextRun(aParams, aLength, aFontGroup, aFlags),
+ mFactory(aFactory), mStyles(aStyles), mString(aString, aLength),
+ mOwnsFactory(aOwnsFactory), mNeedsRebuild(true)
+ {
+ mCharacterGlyphs = reinterpret_cast<CompressedGlyph*>(this + 1);
+ }
+};
+
+/**
+ * Copy a given textrun, but merge certain characters into a single logical
+ * character. Glyphs for a character are added to the glyph list for the previous
+ * character and then the merged character is eliminated. Visually the results
+ * are identical.
+ *
+ * This is used for text-transform:uppercase when we encounter a SZLIG,
+ * whose uppercase form is "SS", or other ligature or precomposed form
+ * that expands to multiple codepoints during case transformation,
+ * and for Greek text when combining diacritics have been deleted.
+ *
+ * This function is unable to merge characters when they occur in different
+ * glyph runs. This only happens in tricky edge cases where a character was
+ * decomposed by case-mapping (e.g. there's no precomposed uppercase version
+ * of an accented lowercase letter), and then font-matching caused the
+ * diacritics to be assigned to a different font than the base character.
+ * In this situation, the diacritic(s) get discarded, which is less than
+ * ideal, but they probably weren't going to render very well anyway.
+ * Bug 543200 will improve this by making font-matching operate on entire
+ * clusters instead of individual codepoints.
+ *
+ * For simplicity, this produces a textrun containing all DetailedGlyphs,
+ * no simple glyphs. So don't call it unless you really have merging to do.
+ *
+ * @param aCharsToMerge when aCharsToMerge[i] is true, this character in aSrc
+ * is merged into the previous character
+ *
+ * @param aDeletedChars when aDeletedChars[i] is true, the character at this
+ * position in aDest was deleted (has no corresponding char in aSrc)
+ */
+void
+MergeCharactersInTextRun(gfxTextRun* aDest, gfxTextRun* aSrc,
+ const bool* aCharsToMerge, const bool* aDeletedChars);
+
+gfxTextRunFactory::Parameters
+GetParametersForInner(nsTransformedTextRun* aTextRun, uint32_t* aFlags,
+ mozilla::gfx::DrawTarget* aRefDrawTarget);
+
+
+#endif /*NSTEXTRUNTRANSFORMATIONS_H_*/