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Diffstat (limited to 'layout/generic/nsTextRunTransformations.cpp')
| -rw-r--r-- | layout/generic/nsTextRunTransformations.cpp | 896 |
1 files changed, 896 insertions, 0 deletions
diff --git a/layout/generic/nsTextRunTransformations.cpp b/layout/generic/nsTextRunTransformations.cpp new file mode 100644 index 0000000000..5dd85fe61f --- /dev/null +++ b/layout/generic/nsTextRunTransformations.cpp @@ -0,0 +1,896 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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/. */ + +#include "nsTextRunTransformations.h" + +#include <utility> + +#include "GreekCasing.h" +#include "IrishCasing.h" +#include "mozilla/ComputedStyleInlines.h" +#include "mozilla/MemoryReporting.h" +#include "mozilla/StaticPrefs_layout.h" +#include "mozilla/TextEditor.h" +#include "mozilla/gfx/2D.h" +#include "nsGkAtoms.h" +#include "nsSpecialCasingData.h" +#include "nsStyleConsts.h" +#include "nsTextFrameUtils.h" +#include "nsUnicharUtils.h" +#include "nsUnicodeProperties.h" + +using namespace mozilla; +using namespace mozilla::gfx; + +// Unicode characters needing special casing treatment in tr/az languages +#define LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE 0x0130 +#define LATIN_SMALL_LETTER_DOTLESS_I 0x0131 + +// Greek sigma needs custom handling for the lowercase transform; for details +// see bug 740120. +#define GREEK_CAPITAL_LETTER_SIGMA 0x03A3 +#define GREEK_SMALL_LETTER_FINAL_SIGMA 0x03C2 +#define GREEK_SMALL_LETTER_SIGMA 0x03C3 + +already_AddRefed<nsTransformedTextRun> nsTransformedTextRun::Create( + const gfxTextRunFactory::Parameters* aParams, + nsTransformingTextRunFactory* aFactory, gfxFontGroup* aFontGroup, + const char16_t* aString, uint32_t aLength, + const gfx::ShapedTextFlags aFlags, const nsTextFrameUtils::Flags aFlags2, + nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles, bool aOwnsFactory) { + NS_ASSERTION(!(aFlags & gfx::ShapedTextFlags::TEXT_IS_8BIT), + "didn't expect text to be marked as 8-bit here"); + + void* storage = + AllocateStorageForTextRun(sizeof(nsTransformedTextRun), aLength); + if (!storage) { + return nullptr; + } + + RefPtr<nsTransformedTextRun> result = new (storage) + nsTransformedTextRun(aParams, aFactory, aFontGroup, aString, aLength, + aFlags, aFlags2, std::move(aStyles), aOwnsFactory); + return result.forget(); +} + +void nsTransformedTextRun::SetCapitalization(uint32_t aStart, uint32_t aLength, + bool* aCapitalization) { + if (mCapitalize.IsEmpty()) { + // XXX(Bug 1631371) Check if this should use a fallible operation as it + // pretended earlier. + mCapitalize.AppendElements(GetLength()); + memset(mCapitalize.Elements(), 0, GetLength() * sizeof(bool)); + } + memcpy(mCapitalize.Elements() + aStart, aCapitalization, + aLength * sizeof(bool)); + mNeedsRebuild = true; +} + +bool nsTransformedTextRun::SetPotentialLineBreaks(Range aRange, + const uint8_t* aBreakBefore) { + bool changed = gfxTextRun::SetPotentialLineBreaks(aRange, aBreakBefore); + if (changed) { + mNeedsRebuild = true; + } + return changed; +} + +size_t nsTransformedTextRun::SizeOfExcludingThis( + mozilla::MallocSizeOf aMallocSizeOf) { + size_t total = gfxTextRun::SizeOfExcludingThis(aMallocSizeOf); + total += mStyles.ShallowSizeOfExcludingThis(aMallocSizeOf); + total += mCapitalize.ShallowSizeOfExcludingThis(aMallocSizeOf); + if (mOwnsFactory) { + total += aMallocSizeOf(mFactory); + } + return total; +} + +size_t nsTransformedTextRun::SizeOfIncludingThis( + mozilla::MallocSizeOf aMallocSizeOf) { + return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf); +} + +already_AddRefed<nsTransformedTextRun> +nsTransformingTextRunFactory::MakeTextRun( + const char16_t* aString, uint32_t aLength, + const gfxTextRunFactory::Parameters* aParams, gfxFontGroup* aFontGroup, + gfx::ShapedTextFlags aFlags, nsTextFrameUtils::Flags aFlags2, + nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles, bool aOwnsFactory) { + return nsTransformedTextRun::Create(aParams, this, aFontGroup, aString, + aLength, aFlags, aFlags2, + std::move(aStyles), aOwnsFactory); +} + +already_AddRefed<nsTransformedTextRun> +nsTransformingTextRunFactory::MakeTextRun( + const uint8_t* aString, uint32_t aLength, + const gfxTextRunFactory::Parameters* aParams, gfxFontGroup* aFontGroup, + gfx::ShapedTextFlags aFlags, nsTextFrameUtils::Flags aFlags2, + nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles, bool aOwnsFactory) { + // We'll only have a Unicode code path to minimize the amount of code needed + // for these rarely used features + NS_ConvertASCIItoUTF16 unicodeString(reinterpret_cast<const char*>(aString), + aLength); + return MakeTextRun(unicodeString.get(), aLength, aParams, aFontGroup, + aFlags & ~gfx::ShapedTextFlags::TEXT_IS_8BIT, aFlags2, + std::move(aStyles), aOwnsFactory); +} + +void MergeCharactersInTextRun(gfxTextRun* aDest, gfxTextRun* aSrc, + const bool* aCharsToMerge, + const bool* aDeletedChars) { + MOZ_ASSERT(!aDest->TrailingGlyphRun(), "unexpected glyphRuns in aDest!"); + uint32_t offset = 0; + AutoTArray<gfxTextRun::DetailedGlyph, 2> glyphs; + const gfxTextRun::CompressedGlyph continuationGlyph = + gfxTextRun::CompressedGlyph::MakeComplex(false, false); + const gfxTextRun::CompressedGlyph* srcGlyphs = aSrc->GetCharacterGlyphs(); + gfxTextRun::CompressedGlyph* destGlyphs = aDest->GetCharacterGlyphs(); + for (gfxTextRun::GlyphRunIterator iter(aSrc, gfxTextRun::Range(aSrc)); + !iter.AtEnd(); iter.NextRun()) { + const gfxTextRun::GlyphRun* run = iter.GlyphRun(); + aDest->AddGlyphRun(run->mFont, run->mMatchType, offset, false, + run->mOrientation, run->mIsCJK); + + bool anyMissing = false; + uint32_t mergeRunStart = iter.StringStart(); + // Initialize to a copy of the first source glyph in the merge run. + gfxTextRun::CompressedGlyph mergedGlyph = srcGlyphs[mergeRunStart]; + uint32_t stringEnd = iter.StringEnd(); + for (uint32_t k = iter.StringStart(); k < stringEnd; ++k) { + const gfxTextRun::CompressedGlyph g = srcGlyphs[k]; + if (g.IsSimpleGlyph()) { + if (!anyMissing) { + gfxTextRun::DetailedGlyph details; + details.mGlyphID = g.GetSimpleGlyph(); + details.mAdvance = g.GetSimpleAdvance(); + glyphs.AppendElement(details); + } + } else { + if (g.IsMissing()) { + anyMissing = true; + glyphs.Clear(); + } + if (g.GetGlyphCount() > 0) { + glyphs.AppendElements(aSrc->GetDetailedGlyphs(k), g.GetGlyphCount()); + } + } + + if (k + 1 < iter.StringEnd() && aCharsToMerge[k + 1]) { + // next char is supposed to merge with current, so loop without + // writing current merged glyph to the destination + continue; + } + + // If the start of the merge run is actually a character that should + // have been merged with the previous character (this can happen + // if there's a font change in the middle of a case-mapped character, + // that decomposed into a sequence of base+diacritics, for example), + // just discard the entire merge run. See comment at start of this + // function. + NS_WARNING_ASSERTION( + !aCharsToMerge[mergeRunStart], + "unable to merge across a glyph run boundary, glyph(s) discarded"); + if (!aCharsToMerge[mergeRunStart]) { + // Determine if we can just copy the existing simple glyph record. + if (mergedGlyph.IsSimpleGlyph() && glyphs.Length() == 1) { + destGlyphs[offset] = mergedGlyph; + } else { + // Otherwise set up complex glyph record and store detailed glyphs. + mergedGlyph.SetComplex(mergedGlyph.IsClusterStart(), + mergedGlyph.IsLigatureGroupStart()); + destGlyphs[offset] = mergedGlyph; + aDest->SetDetailedGlyphs(offset, glyphs.Length(), glyphs.Elements()); + if (anyMissing) { + destGlyphs[offset].SetMissing(); + } + } + offset++; + + while (offset < aDest->GetLength() && aDeletedChars[offset]) { + destGlyphs[offset++] = continuationGlyph; + } + } + + glyphs.Clear(); + anyMissing = false; + mergeRunStart = k + 1; + if (mergeRunStart < stringEnd) { + mergedGlyph = srcGlyphs[mergeRunStart]; + } + } + NS_ASSERTION(glyphs.Length() == 0, + "Leftover glyphs, don't request merging of the last character " + "with its next!"); + } + NS_ASSERTION(offset == aDest->GetLength(), "Bad offset calculations"); +} + +gfxTextRunFactory::Parameters GetParametersForInner( + nsTransformedTextRun* aTextRun, gfx::ShapedTextFlags* aFlags, + DrawTarget* aRefDrawTarget) { + gfxTextRunFactory::Parameters params = { + aRefDrawTarget, nullptr, nullptr, + nullptr, 0, aTextRun->GetAppUnitsPerDevUnit()}; + *aFlags = aTextRun->GetFlags(); + return params; +} + +// Some languages have special casing conventions that differ from the +// default Unicode mappings. +// The enum values here are named for well-known exemplar languages that +// exhibit the behavior in question; multiple lang tags may map to the +// same setting here, if the behavior is shared by other languages. +enum LanguageSpecificCasingBehavior { + eLSCB_None, // default non-lang-specific behavior + eLSCB_Dutch, // treat "ij" digraph as a unit for capitalization + eLSCB_Greek, // strip accent when uppercasing Greek vowels + eLSCB_Irish, // keep prefix letters as lowercase when uppercasing Irish + eLSCB_Turkish, // preserve dotted/dotless-i distinction in uppercase + eLSCB_Lithuanian // retain dot on lowercase i/j when an accent is present +}; + +static LanguageSpecificCasingBehavior GetCasingFor(const nsAtom* aLang) { + if (!aLang) { + return eLSCB_None; + } + if (aLang == nsGkAtoms::tr || aLang == nsGkAtoms::az || + aLang == nsGkAtoms::ba || aLang == nsGkAtoms::crh || + aLang == nsGkAtoms::tt) { + return eLSCB_Turkish; + } + if (aLang == nsGkAtoms::nl) { + return eLSCB_Dutch; + } + if (aLang == nsGkAtoms::el) { + return eLSCB_Greek; + } + if (aLang == nsGkAtoms::ga) { + return eLSCB_Irish; + } + if (aLang == nsGkAtoms::lt_) { + return eLSCB_Lithuanian; + } + + // Is there a region subtag we should ignore? + nsAtomString langStr(const_cast<nsAtom*>(aLang)); + int index = langStr.FindChar('-'); + if (index > 0) { + langStr.Truncate(index); + RefPtr<nsAtom> truncatedLang = NS_Atomize(langStr); + return GetCasingFor(truncatedLang); + } + + return eLSCB_None; +} + +bool nsCaseTransformTextRunFactory::TransformString( + const nsAString& aString, nsString& aConvertedString, + const Maybe<StyleTextTransform>& aGlobalTransform, char16_t aMaskChar, + bool aCaseTransformsOnly, const nsAtom* aLanguage, + nsTArray<bool>& aCharsToMergeArray, nsTArray<bool>& aDeletedCharsArray, + const nsTransformedTextRun* aTextRun, uint32_t aOffsetInTextRun, + nsTArray<uint8_t>* aCanBreakBeforeArray, + nsTArray<RefPtr<nsTransformedCharStyle>>* aStyleArray) { + bool auxiliaryOutputArrays = aCanBreakBeforeArray && aStyleArray; + MOZ_ASSERT(!auxiliaryOutputArrays || aTextRun, + "text run must be provided to use aux output arrays"); + + uint32_t length = aString.Length(); + const char16_t* str = aString.BeginReading(); + // If an unconditional mask character was passed, we'll use it; if not, any + // masking called for by the textrun styles will use TextEditor's mask char. + const char16_t mask = aMaskChar ? aMaskChar : TextEditor::PasswordMask(); + + bool mergeNeeded = false; + + bool capitalizeDutchIJ = false; + bool prevIsLetter = false; + bool ntPrefix = false; // true immediately after a word-initial 'n' or 't' + // when doing Irish lowercasing + bool seenSoftDotted = false; // true immediately after an I or J that is + // converted to lowercase in Lithuanian mode + uint32_t sigmaIndex = uint32_t(-1); + nsUGenCategory cat; + + StyleTextTransform style = + aGlobalTransform.valueOr(StyleTextTransform::None()); + bool forceNonFullWidth = false; + const nsAtom* lang = aLanguage; + + LanguageSpecificCasingBehavior languageSpecificCasing = GetCasingFor(lang); + mozilla::GreekCasing::State greekState; + mozilla::IrishCasing::State irishState; + uint32_t irishMark = uint32_t(-1); // location of possible prefix letter(s) + // in the output string + uint32_t irishMarkSrc = uint32_t(-1); // corresponding location in source + // string (may differ from output due + // to expansions like eszet -> 'SS') + uint32_t greekMark = uint32_t(-1); // location of uppercase ETA that may need + // tonos added (if it is disjunctive eta) + const char16_t kGreekUpperEta = 0x0397; + + for (uint32_t i = 0; i < length; ++i, ++aOffsetInTextRun) { + uint32_t ch = str[i]; + + RefPtr<nsTransformedCharStyle> charStyle; + if (aTextRun) { + charStyle = aTextRun->mStyles[aOffsetInTextRun]; + style = aGlobalTransform.valueOr(charStyle->mTextTransform); + forceNonFullWidth = charStyle->mForceNonFullWidth; + + nsAtom* newLang = + charStyle->mExplicitLanguage ? charStyle->mLanguage.get() : nullptr; + if (lang != newLang) { + lang = newLang; + languageSpecificCasing = GetCasingFor(lang); + greekState.Reset(); + irishState.Reset(); + irishMark = uint32_t(-1); + irishMarkSrc = uint32_t(-1); + greekMark = uint32_t(-1); + } + } + + // These should be mutually exclusive: mMaskPassword is set if we are + // handling <input type=password>, where the TextEditor code controls + // masking and we use its PasswordMask() character, in which case + // aMaskChar (from -webkit-text-security) is not used. + MOZ_ASSERT_IF(aMaskChar, !(charStyle && charStyle->mMaskPassword)); + + bool maskPassword = (charStyle && charStyle->mMaskPassword) || aMaskChar; + int extraChars = 0; + const mozilla::unicode::MultiCharMapping* mcm; + bool inhibitBreakBefore = false; // have we just deleted preceding hyphen? + + if (i < length - 1 && NS_IS_SURROGATE_PAIR(ch, str[i + 1])) { + ch = SURROGATE_TO_UCS4(ch, str[i + 1]); + } + + // Skip case transform if we're masking current character. + if (!maskPassword) { + switch (style.case_) { + case StyleTextTransformCase::None: + break; + + case StyleTextTransformCase::Lowercase: + if (languageSpecificCasing == eLSCB_Turkish) { + if (ch == 'I') { + ch = LATIN_SMALL_LETTER_DOTLESS_I; + prevIsLetter = true; + sigmaIndex = uint32_t(-1); + break; + } + if (ch == LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE) { + ch = 'i'; + prevIsLetter = true; + sigmaIndex = uint32_t(-1); + break; + } + } + + if (languageSpecificCasing == eLSCB_Lithuanian) { + // clang-format off + /* From SpecialCasing.txt: + * # Introduce an explicit dot above when lowercasing capital I's and J's + * # whenever there are more accents above. + * # (of the accents used in Lithuanian: grave, acute, tilde above, and ogonek) + * + * 0049; 0069 0307; 0049; 0049; lt More_Above; # LATIN CAPITAL LETTER I + * 004A; 006A 0307; 004A; 004A; lt More_Above; # LATIN CAPITAL LETTER J + * 012E; 012F 0307; 012E; 012E; lt More_Above; # LATIN CAPITAL LETTER I WITH OGONEK + * 00CC; 0069 0307 0300; 00CC; 00CC; lt; # LATIN CAPITAL LETTER I WITH GRAVE + * 00CD; 0069 0307 0301; 00CD; 00CD; lt; # LATIN CAPITAL LETTER I WITH ACUTE + * 0128; 0069 0307 0303; 0128; 0128; lt; # LATIN CAPITAL LETTER I WITH TILDE + */ + // clang-format on + if (ch == 'I' || ch == 'J' || ch == 0x012E) { + ch = ToLowerCase(ch); + prevIsLetter = true; + seenSoftDotted = true; + sigmaIndex = uint32_t(-1); + break; + } + if (ch == 0x00CC) { + aConvertedString.Append('i'); + aConvertedString.Append(0x0307); + extraChars += 2; + ch = 0x0300; + prevIsLetter = true; + seenSoftDotted = false; + sigmaIndex = uint32_t(-1); + break; + } + if (ch == 0x00CD) { + aConvertedString.Append('i'); + aConvertedString.Append(0x0307); + extraChars += 2; + ch = 0x0301; + prevIsLetter = true; + seenSoftDotted = false; + sigmaIndex = uint32_t(-1); + break; + } + if (ch == 0x0128) { + aConvertedString.Append('i'); + aConvertedString.Append(0x0307); + extraChars += 2; + ch = 0x0303; + prevIsLetter = true; + seenSoftDotted = false; + sigmaIndex = uint32_t(-1); + break; + } + } + + cat = mozilla::unicode::GetGenCategory(ch); + + if (languageSpecificCasing == eLSCB_Irish && + cat == nsUGenCategory::kLetter) { + // See bug 1018805 for Irish lowercasing requirements + if (!prevIsLetter && (ch == 'n' || ch == 't')) { + ntPrefix = true; + } else { + if (ntPrefix && mozilla::IrishCasing::IsUpperVowel(ch)) { + aConvertedString.Append('-'); + ++extraChars; + } + ntPrefix = false; + } + } else { + ntPrefix = false; + } + + if (seenSoftDotted && cat == nsUGenCategory::kMark) { + // The seenSoftDotted flag will only be set in Lithuanian mode. + if (ch == 0x0300 || ch == 0x0301 || ch == 0x0303) { + aConvertedString.Append(0x0307); + ++extraChars; + } + } + seenSoftDotted = false; + + // Special lowercasing behavior for Greek Sigma: note that this is + // listed as context-sensitive in Unicode's SpecialCasing.txt, but is + // *not* a language-specific mapping; it applies regardless of the + // language of the element. + // + // The lowercase mapping for CAPITAL SIGMA should be to SMALL SIGMA + // (i.e. the non-final form) whenever there is a following letter, or + // when the CAPITAL SIGMA occurs in isolation (neither preceded nor + // followed by a LETTER); and to FINAL SIGMA when it is preceded by + // another letter but not followed by one. + // + // To implement the context-sensitive nature of this mapping, we keep + // track of whether the previous character was a letter. If not, + // CAPITAL SIGMA will map directly to SMALL SIGMA. If the previous + // character was a letter, CAPITAL SIGMA maps to FINAL SIGMA and we + // record the position in the converted string; if we then encounter + // another letter, that FINAL SIGMA is replaced with a standard + // SMALL SIGMA. + + // If sigmaIndex is not -1, it marks where we have provisionally + // mapped a CAPITAL SIGMA to FINAL SIGMA; if we now find another + // letter, we need to change it to SMALL SIGMA. + if (sigmaIndex != uint32_t(-1)) { + if (cat == nsUGenCategory::kLetter) { + aConvertedString.SetCharAt(GREEK_SMALL_LETTER_SIGMA, sigmaIndex); + } + } + + if (ch == GREEK_CAPITAL_LETTER_SIGMA) { + // If preceding char was a letter, map to FINAL instead of SMALL, + // and note where it occurred by setting sigmaIndex; we'll change + // it to standard SMALL SIGMA later if another letter follows + if (prevIsLetter) { + ch = GREEK_SMALL_LETTER_FINAL_SIGMA; + sigmaIndex = aConvertedString.Length(); + } else { + // CAPITAL SIGMA not preceded by a letter is unconditionally + // mapped to SMALL SIGMA + ch = GREEK_SMALL_LETTER_SIGMA; + sigmaIndex = uint32_t(-1); + } + prevIsLetter = true; + break; + } + + // ignore diacritics for the purpose of contextual sigma mapping; + // otherwise, reset prevIsLetter appropriately and clear the + // sigmaIndex marker + if (cat != nsUGenCategory::kMark) { + prevIsLetter = (cat == nsUGenCategory::kLetter); + sigmaIndex = uint32_t(-1); + } + + mcm = mozilla::unicode::SpecialLower(ch); + if (mcm) { + int j = 0; + while (j < 2 && mcm->mMappedChars[j + 1]) { + aConvertedString.Append(mcm->mMappedChars[j]); + ++extraChars; + ++j; + } + ch = mcm->mMappedChars[j]; + break; + } + + ch = ToLowerCase(ch); + break; + + case StyleTextTransformCase::Uppercase: + if (languageSpecificCasing == eLSCB_Turkish && ch == 'i') { + ch = LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE; + break; + } + + if (languageSpecificCasing == eLSCB_Greek) { + bool markEta; + bool updateEta; + ch = mozilla::GreekCasing::UpperCase(ch, greekState, markEta, + updateEta); + if (markEta) { + greekMark = aConvertedString.Length(); + } else if (updateEta) { + // Remove the TONOS from an uppercase ETA-TONOS that turned out + // not to be disjunctive-eta. + MOZ_ASSERT(aConvertedString.Length() > 0 && + greekMark < aConvertedString.Length(), + "bad greekMark!"); + aConvertedString.SetCharAt(kGreekUpperEta, greekMark); + greekMark = uint32_t(-1); + } + break; + } + + if (languageSpecificCasing == eLSCB_Lithuanian) { + /* + * # Remove DOT ABOVE after "i" with upper or titlecase + * + * 0307; 0307; ; ; lt After_Soft_Dotted; # COMBINING DOT ABOVE + */ + if (ch == 'i' || ch == 'j' || ch == 0x012F) { + seenSoftDotted = true; + ch = ToTitleCase(ch); + break; + } + if (seenSoftDotted) { + seenSoftDotted = false; + if (ch == 0x0307) { + ch = uint32_t(-1); + break; + } + } + } + + if (languageSpecificCasing == eLSCB_Irish) { + bool mark; + uint8_t action; + ch = mozilla::IrishCasing::UpperCase(ch, irishState, mark, action); + if (mark) { + irishMark = aConvertedString.Length(); + irishMarkSrc = i; + break; + } else if (action) { + nsString& str = aConvertedString; // shorthand + switch (action) { + case 1: + // lowercase a single prefix letter + NS_ASSERTION(str.Length() > 0 && irishMark < str.Length(), + "bad irishMark!"); + str.SetCharAt(ToLowerCase(str[irishMark]), irishMark); + irishMark = uint32_t(-1); + irishMarkSrc = uint32_t(-1); + break; + case 2: + // lowercase two prefix letters (immediately before current + // pos) + NS_ASSERTION( + str.Length() >= 2 && irishMark == str.Length() - 2, + "bad irishMark!"); + str.SetCharAt(ToLowerCase(str[irishMark]), irishMark); + str.SetCharAt(ToLowerCase(str[irishMark + 1]), irishMark + 1); + irishMark = uint32_t(-1); + irishMarkSrc = uint32_t(-1); + break; + case 3: + // lowercase one prefix letter, and delete following hyphen + // (which must be the immediately-preceding char) + NS_ASSERTION( + str.Length() >= 2 && irishMark == str.Length() - 2, + "bad irishMark!"); + MOZ_ASSERT( + irishMark != uint32_t(-1) && irishMarkSrc != uint32_t(-1), + "failed to set irishMarks"); + str.Replace(irishMark, 2, ToLowerCase(str[irishMark])); + aDeletedCharsArray[irishMarkSrc + 1] = true; + // Remove the trailing entries (corresponding to the deleted + // hyphen) from the auxiliary arrays. + aCharsToMergeArray.SetLength(aCharsToMergeArray.Length() - 1); + if (auxiliaryOutputArrays) { + aStyleArray->SetLength(aStyleArray->Length() - 1); + aCanBreakBeforeArray->SetLength( + aCanBreakBeforeArray->Length() - 1); + inhibitBreakBefore = true; + } + mergeNeeded = true; + irishMark = uint32_t(-1); + irishMarkSrc = uint32_t(-1); + break; + } + // ch has been set to the uppercase for current char; + // No need to check for SpecialUpper here as none of the + // characters that could trigger an Irish casing action have + // special mappings. + break; + } + // If we didn't have any special action to perform, fall through + // to check for special uppercase (ß) + } + + // Updated mapping for German eszett, not currently reflected in the + // Unicode data files. This is behind a pref, as it may not work well + // with many (esp. older) fonts. + if (ch == 0x00DF && + StaticPrefs:: + layout_css_text_transform_uppercase_eszett_enabled()) { + ch = 0x1E9E; + break; + } + + mcm = mozilla::unicode::SpecialUpper(ch); + if (mcm) { + int j = 0; + while (j < 2 && mcm->mMappedChars[j + 1]) { + aConvertedString.Append(mcm->mMappedChars[j]); + ++extraChars; + ++j; + } + ch = mcm->mMappedChars[j]; + break; + } + + // Bug 1476304: we exclude Georgian letters U+10D0..10FF because of + // lack of widespread font support for the corresponding Mtavruli + // characters at this time (July 2018). + // This condition is to be removed once the major platforms ship with + // fonts that support U+1C90..1CBF. + if (ch < 0x10D0 || ch > 0x10FF) { + ch = ToUpperCase(ch); + } + break; + + case StyleTextTransformCase::Capitalize: + if (aTextRun) { + if (capitalizeDutchIJ && ch == 'j') { + ch = 'J'; + capitalizeDutchIJ = false; + break; + } + capitalizeDutchIJ = false; + if (aOffsetInTextRun < aTextRun->mCapitalize.Length() && + aTextRun->mCapitalize[aOffsetInTextRun]) { + if (languageSpecificCasing == eLSCB_Turkish && ch == 'i') { + ch = LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE; + break; + } + if (languageSpecificCasing == eLSCB_Dutch && ch == 'i') { + ch = 'I'; + capitalizeDutchIJ = true; + break; + } + if (languageSpecificCasing == eLSCB_Lithuanian) { + /* + * # Remove DOT ABOVE after "i" with upper or titlecase + * + * 0307; 0307; ; ; lt After_Soft_Dotted; # COMBINING DOT ABOVE + */ + if (ch == 'i' || ch == 'j' || ch == 0x012F) { + seenSoftDotted = true; + ch = ToTitleCase(ch); + break; + } + if (seenSoftDotted) { + seenSoftDotted = false; + if (ch == 0x0307) { + ch = uint32_t(-1); + break; + } + } + } + + mcm = mozilla::unicode::SpecialTitle(ch); + if (mcm) { + int j = 0; + while (j < 2 && mcm->mMappedChars[j + 1]) { + aConvertedString.Append(mcm->mMappedChars[j]); + ++extraChars; + ++j; + } + ch = mcm->mMappedChars[j]; + break; + } + + ch = ToTitleCase(ch); + } + } + break; + + default: + MOZ_ASSERT_UNREACHABLE("all cases should be handled"); + break; + } + + if (!aCaseTransformsOnly) { + if (!forceNonFullWidth && + (style.other_ & StyleTextTransformOther::FULL_WIDTH)) { + ch = mozilla::unicode::GetFullWidth(ch); + } + + if (style.other_ & StyleTextTransformOther::FULL_SIZE_KANA) { + // clang-format off + static const uint16_t kSmallKanas[] = { + // ぁ ぃ ぅ ぇ ぉ っ ゃ ゅ ょ + 0x3041, 0x3043, 0x3045, 0x3047, 0x3049, 0x3063, 0x3083, 0x3085, 0x3087, + // ゎ ゕ ゖ + 0x308E, 0x3095, 0x3096, + // ァ ィ ゥ ェ ォ ッ ャ ュ ョ + 0x30A1, 0x30A3, 0x30A5, 0x30A7, 0x30A9, 0x30C3, 0x30E3, 0x30E5, 0x30E7, + // ヮ ヵ ヶ ㇰ ㇱ ㇲ ㇳ ㇴ ㇵ + 0x30EE, 0x30F5, 0x30F6, 0x31F0, 0x31F1, 0x31F2, 0x31F3, 0x31F4, 0x31F5, + // ㇶ ㇷ ㇸ ㇹ ㇺ ㇻ ㇼ ㇽ ㇾ + 0x31F6, 0x31F7, 0x31F8, 0x31F9, 0x31FA, 0x31FB, 0x31FC, 0x31FD, 0x31FE, + // ㇿ + 0x31FF, + // ｧ ｨ ｩ ｪ ｫ ｬ ｭ ｮ ｯ + 0xFF67, 0xFF68, 0xFF69, 0xFF6A, 0xFF6B, 0xFF6C, 0xFF6D, 0xFF6E, 0xFF6F}; + static const uint16_t kFullSizeKanas[] = { + // あ い う え お つ や ゆ よ + 0x3042, 0x3044, 0x3046, 0x3048, 0x304A, 0x3064, 0x3084, 0x3086, 0x3088, + // わ か け + 0x308F, 0x304B, 0x3051, + // ア イ ウ エ オ ツ ヤ ユ ヨ + 0x30A2, 0x30A4, 0x30A6, 0x30A8, 0x30AA, 0x30C4, 0x30E4, 0x30E6, 0x30E8, + // ワ カ ケ ク シ ス ト ヌ ハ + 0x30EF, 0x30AB, 0x30B1, 0x30AF, 0x30B7, 0x30B9, 0x30C8, 0x30CC, 0x30CF, + // ヒ フ ヘ ホ ム ラ リ ル レ + 0x30D2, 0x30D5, 0x30D8, 0x30DB, 0x30E0, 0x30E9, 0x30EA, 0x30EB, 0x30EC, + // ロ + 0x30ED, + // ｱ ｲ ｳ ｴ ｵ ﾔ ﾕ ﾖ ﾂ + 0xFF71, 0xFF72, 0xFF73, 0xFF74, 0xFF75, 0xFF94, 0xFF95, 0xFF96, 0xFF82}; + // clang-format on + + size_t index; + const uint16_t len = MOZ_ARRAY_LENGTH(kSmallKanas); + if (mozilla::BinarySearch(kSmallKanas, 0, len, ch, &index)) { + ch = kFullSizeKanas[index]; + } + } + } + + if (forceNonFullWidth) { + ch = mozilla::unicode::GetFullWidthInverse(ch); + } + } + + if (ch == uint32_t(-1)) { + aDeletedCharsArray.AppendElement(true); + mergeNeeded = true; + } else { + aDeletedCharsArray.AppendElement(false); + aCharsToMergeArray.AppendElement(false); + if (auxiliaryOutputArrays) { + aStyleArray->AppendElement(charStyle); + aCanBreakBeforeArray->AppendElement( + inhibitBreakBefore + ? gfxShapedText::CompressedGlyph::FLAG_BREAK_TYPE_NONE + : aTextRun->CanBreakBefore(aOffsetInTextRun)); + } + + if (IS_IN_BMP(ch)) { + aConvertedString.Append(maskPassword ? mask : ch); + } else { + if (maskPassword) { + aConvertedString.Append(mask); + // TODO: We should show a password mask for a surrogate pair later. + aConvertedString.Append(mask); + } else { + aConvertedString.Append(H_SURROGATE(ch)); + aConvertedString.Append(L_SURROGATE(ch)); + } + ++extraChars; + ++i; + ++aOffsetInTextRun; + // Skip the trailing surrogate. + aDeletedCharsArray.AppendElement(true); + } + + while (extraChars-- > 0) { + mergeNeeded = true; + aCharsToMergeArray.AppendElement(true); + if (auxiliaryOutputArrays) { + aStyleArray->AppendElement(charStyle); + aCanBreakBeforeArray->AppendElement( + gfxShapedText::CompressedGlyph::FLAG_BREAK_TYPE_NONE); + } + } + } + } + + return mergeNeeded; +} + +void nsCaseTransformTextRunFactory::RebuildTextRun( + nsTransformedTextRun* aTextRun, DrawTarget* aRefDrawTarget, + gfxMissingFontRecorder* aMFR) { + nsAutoString convertedString; + AutoTArray<bool, 50> charsToMergeArray; + AutoTArray<bool, 50> deletedCharsArray; + AutoTArray<uint8_t, 50> canBreakBeforeArray; + AutoTArray<RefPtr<nsTransformedCharStyle>, 50> styleArray; + + auto globalTransform = + mAllUppercase + ? Some(StyleTextTransform{StyleTextTransformCase::Uppercase, {}}) + : Nothing(); + bool mergeNeeded = TransformString( + aTextRun->mString, convertedString, globalTransform, mMaskChar, + /* aCaseTransformsOnly = */ false, nullptr, charsToMergeArray, + deletedCharsArray, aTextRun, 0, &canBreakBeforeArray, &styleArray); + + gfx::ShapedTextFlags flags; + gfxTextRunFactory::Parameters innerParams = + GetParametersForInner(aTextRun, &flags, aRefDrawTarget); + gfxFontGroup* fontGroup = aTextRun->GetFontGroup(); + + RefPtr<nsTransformedTextRun> transformedChild; + RefPtr<gfxTextRun> cachedChild; + gfxTextRun* child; + + if (mInnerTransformingTextRunFactory) { + transformedChild = mInnerTransformingTextRunFactory->MakeTextRun( + convertedString.BeginReading(), convertedString.Length(), &innerParams, + fontGroup, flags, nsTextFrameUtils::Flags(), std::move(styleArray), + false); + child = transformedChild.get(); + } else { + cachedChild = fontGroup->MakeTextRun( + convertedString.BeginReading(), convertedString.Length(), &innerParams, + flags, nsTextFrameUtils::Flags(), aMFR); + child = cachedChild.get(); + } + if (!child) { + return; + } + // Copy potential linebreaks into child so they're preserved + // (and also child will be shaped appropriately) + NS_ASSERTION(convertedString.Length() == canBreakBeforeArray.Length(), + "Dropped characters or break-before values somewhere!"); + gfxTextRun::Range range(0, uint32_t(canBreakBeforeArray.Length())); + child->SetPotentialLineBreaks(range, canBreakBeforeArray.Elements()); + if (transformedChild) { + transformedChild->FinishSettingProperties(aRefDrawTarget, aMFR); + } + + aTextRun->ResetGlyphRuns(); + if (mergeNeeded) { + // Now merge multiple characters into one multi-glyph character as required + // and deal with skipping deleted accent chars + NS_ASSERTION(charsToMergeArray.Length() == child->GetLength(), + "source length mismatch"); + NS_ASSERTION(deletedCharsArray.Length() == aTextRun->GetLength(), + "destination length mismatch"); + MergeCharactersInTextRun(aTextRun, child, charsToMergeArray.Elements(), + deletedCharsArray.Elements()); + } else { + // No merging to do, so just copy; this produces a more optimized textrun. + // We can't steal the data because the child may be cached and stealing + // the data would break the cache. + aTextRun->CopyGlyphDataFrom(child, gfxTextRun::Range(child), 0); + } +} |