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-rw-r--r--layout/generic/nsTextRunTransformations.cpp692
1 files changed, 692 insertions, 0 deletions
diff --git a/layout/generic/nsTextRunTransformations.cpp b/layout/generic/nsTextRunTransformations.cpp
new file mode 100644
index 000000000..84d669ed6
--- /dev/null
+++ b/layout/generic/nsTextRunTransformations.cpp
@@ -0,0 +1,692 @@
+/* -*- 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/. */
+
+#include "nsTextRunTransformations.h"
+
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/Move.h"
+
+#include "nsGkAtoms.h"
+#include "nsStyleConsts.h"
+#include "nsUnicharUtils.h"
+#include "nsUnicodeProperties.h"
+#include "nsSpecialCasingData.h"
+#include "mozilla/gfx/2D.h"
+#include "nsTextFrameUtils.h"
+#include "nsIPersistentProperties2.h"
+#include "GreekCasing.h"
+#include "IrishCasing.h"
+
+using namespace mozilla;
+
+// 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 comments under "case NS_STYLE_TEXT_TRANSFORM_LOWERCASE" within
+// nsCaseTransformTextRunFactory::RebuildTextRun(), and 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 uint32_t aFlags,
+ nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles,
+ bool aOwnsFactory)
+{
+ NS_ASSERTION(!(aFlags & gfxTextRunFactory::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,
+ Move(aStyles), aOwnsFactory);
+ return result.forget();
+}
+
+void
+nsTransformedTextRun::SetCapitalization(uint32_t aStart, uint32_t aLength,
+ bool* aCapitalization)
+{
+ if (mCapitalize.IsEmpty()) {
+ if (!mCapitalize.AppendElements(GetLength()))
+ return;
+ 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, uint32_t aFlags,
+ nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles,
+ bool aOwnsFactory)
+{
+ return nsTransformedTextRun::Create(aParams, this, aFontGroup,
+ aString, aLength, aFlags, Move(aStyles),
+ aOwnsFactory);
+}
+
+already_AddRefed<nsTransformedTextRun>
+nsTransformingTextRunFactory::MakeTextRun(const uint8_t* aString, uint32_t aLength,
+ const gfxTextRunFactory::Parameters* aParams,
+ gfxFontGroup* aFontGroup, uint32_t aFlags,
+ 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 & ~(gfxFontGroup::TEXT_IS_PERSISTENT | gfxFontGroup::TEXT_IS_8BIT),
+ Move(aStyles), aOwnsFactory);
+}
+
+void
+MergeCharactersInTextRun(gfxTextRun* aDest, gfxTextRun* aSrc,
+ const bool* aCharsToMerge, const bool* aDeletedChars)
+{
+ aDest->ResetGlyphRuns();
+
+ gfxTextRun::GlyphRunIterator iter(aSrc, gfxTextRun::Range(aSrc));
+ uint32_t offset = 0;
+ AutoTArray<gfxTextRun::DetailedGlyph,2> glyphs;
+ while (iter.NextRun()) {
+ const gfxTextRun::GlyphRun* run = iter.GetGlyphRun();
+ nsresult rv = aDest->AddGlyphRun(run->mFont, run->mMatchType,
+ offset, false, run->mOrientation);
+ if (NS_FAILED(rv))
+ return;
+
+ bool anyMissing = false;
+ uint32_t mergeRunStart = iter.GetStringStart();
+ const gfxTextRun::CompressedGlyph *srcGlyphs = aSrc->GetCharacterGlyphs();
+ gfxTextRun::CompressedGlyph mergedGlyph = srcGlyphs[mergeRunStart];
+ uint32_t stringEnd = iter.GetStringEnd();
+ for (uint32_t k = iter.GetStringStart(); 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();
+ details.mXOffset = 0;
+ details.mYOffset = 0;
+ 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.GetStringEnd() && 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]) {
+ if (anyMissing) {
+ mergedGlyph.SetMissing(glyphs.Length());
+ } else {
+ mergedGlyph.SetComplex(mergedGlyph.IsClusterStart(),
+ mergedGlyph.IsLigatureGroupStart(),
+ glyphs.Length());
+ }
+ aDest->SetGlyphs(offset, mergedGlyph, glyphs.Elements());
+ ++offset;
+
+ while (offset < aDest->GetLength() && aDeletedChars[offset]) {
+ aDest->SetGlyphs(offset++, gfxTextRun::CompressedGlyph(), nullptr);
+ }
+ }
+
+ 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, uint32_t* aFlags,
+ DrawTarget* aRefDrawTarget)
+{
+ gfxTextRunFactory::Parameters params =
+ { aRefDrawTarget, nullptr, nullptr,
+ nullptr, 0, aTextRun->GetAppUnitsPerDevUnit()
+ };
+ *aFlags = aTextRun->GetFlags() & ~gfxFontGroup::TEXT_IS_PERSISTENT;
+ 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
+};
+
+static LanguageSpecificCasingBehavior
+GetCasingFor(const nsIAtom* 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;
+ }
+
+ // Is there a region subtag we should ignore?
+ nsAtomString langStr(const_cast<nsIAtom*>(aLang));
+ int index = langStr.FindChar('-');
+ if (index > 0) {
+ langStr.Truncate(index);
+ nsCOMPtr<nsIAtom> truncatedLang = NS_Atomize(langStr);
+ return GetCasingFor(truncatedLang);
+ }
+
+ return eLSCB_None;
+}
+
+bool
+nsCaseTransformTextRunFactory::TransformString(
+ const nsAString& aString,
+ nsString& aConvertedString,
+ bool aAllUppercase,
+ const nsIAtom* 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();
+
+ 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
+ uint32_t sigmaIndex = uint32_t(-1);
+ nsIUGenCategory::nsUGenCategory cat;
+
+ uint8_t style = aAllUppercase ? NS_STYLE_TEXT_TRANSFORM_UPPERCASE : 0;
+ bool forceNonFullWidth = false;
+ const nsIAtom* 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')
+
+ for (uint32_t i = 0; i < length; ++i, ++aOffsetInTextRun) {
+ uint32_t ch = str[i];
+
+ RefPtr<nsTransformedCharStyle> charStyle;
+ if (aTextRun) {
+ charStyle = aTextRun->mStyles[aOffsetInTextRun];
+ style = aAllUppercase ? NS_STYLE_TEXT_TRANSFORM_UPPERCASE :
+ charStyle->mTextTransform;
+ forceNonFullWidth = charStyle->mForceNonFullWidth;
+
+ nsIAtom* 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);
+ }
+ }
+
+ int extraChars = 0;
+ const mozilla::unicode::MultiCharMapping *mcm;
+ bool inhibitBreakBefore = false; // have we just deleted preceding hyphen?
+
+ if (NS_IS_HIGH_SURROGATE(ch) && i < length - 1 &&
+ NS_IS_LOW_SURROGATE(str[i + 1])) {
+ ch = SURROGATE_TO_UCS4(ch, str[i + 1]);
+ }
+
+ switch (style) {
+ case NS_STYLE_TEXT_TRANSFORM_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;
+ }
+ }
+
+ cat = mozilla::unicode::GetGenCategory(ch);
+
+ if (languageSpecificCasing == eLSCB_Irish &&
+ cat == nsIUGenCategory::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;
+ }
+
+ // 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 == nsIUGenCategory::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 != nsIUGenCategory::kMark) {
+ prevIsLetter = (cat == nsIUGenCategory::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 NS_STYLE_TEXT_TRANSFORM_UPPERCASE:
+ if (languageSpecificCasing == eLSCB_Turkish && ch == 'i') {
+ ch = LATIN_CAPITAL_LETTER_I_WITH_DOT_ABOVE;
+ break;
+ }
+
+ if (languageSpecificCasing == eLSCB_Greek) {
+ ch = mozilla::GreekCasing::UpperCase(ch, greekState);
+ 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)
+ }
+
+ 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;
+ }
+
+ ch = ToUpperCase(ch);
+ break;
+
+ case NS_STYLE_TEXT_TRANSFORM_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;
+ }
+
+ 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;
+
+ case NS_STYLE_TEXT_TRANSFORM_FULL_WIDTH:
+ ch = mozilla::unicode::GetFullWidth(ch);
+ break;
+
+ default:
+ break;
+ }
+
+ 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(ch);
+ } else {
+ aConvertedString.Append(H_SURROGATE(ch));
+ aConvertedString.Append(L_SURROGATE(ch));
+ i++;
+ aOffsetInTextRun++;
+ aDeletedCharsArray.AppendElement(true); // not exactly deleted, but the
+ // trailing surrogate is skipped
+ ++extraChars;
+ }
+
+ 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;
+
+ bool mergeNeeded = TransformString(aTextRun->mString,
+ convertedString,
+ mAllUppercase,
+ nullptr,
+ charsToMergeArray,
+ deletedCharsArray,
+ aTextRun, 0,
+ &canBreakBeforeArray,
+ &styleArray);
+
+ uint32_t 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, Move(styleArray), false);
+ child = transformedChild.get();
+ } else {
+ cachedChild = fontGroup->MakeTextRun(
+ convertedString.BeginReading(), convertedString.Length(),
+ &innerParams, 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);
+ }
+
+ 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->ResetGlyphRuns();
+ aTextRun->CopyGlyphDataFrom(child, gfxTextRun::Range(child), 0);
+ }
+}