| /* |
| * (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2004-2007, 2013-2015 Apple Inc. All rights reserved. |
| * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net) |
| * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com) |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "config.h" |
| #include "RenderText.h" |
| |
| #include "AXObjectCache.h" |
| #include "BreakLines.h" |
| #include "BreakingContext.h" |
| #include "CharacterProperties.h" |
| #include "EllipsisBox.h" |
| #include "FloatQuad.h" |
| #include "Frame.h" |
| #include "FrameView.h" |
| #include "Hyphenation.h" |
| #include "InlineTextBox.h" |
| #include "Range.h" |
| #include "RenderBlock.h" |
| #include "RenderCombineText.h" |
| #include "RenderInline.h" |
| #include "RenderLayer.h" |
| #include "RenderView.h" |
| #include "Settings.h" |
| #include "SimpleLineLayoutFunctions.h" |
| #include "Text.h" |
| #include <wtf/text/TextBreakIterator.h> |
| #include "TextResourceDecoder.h" |
| #include "VisiblePosition.h" |
| #include <wtf/NeverDestroyed.h> |
| #include <wtf/text/StringBuffer.h> |
| #include <wtf/text/StringBuilder.h> |
| #include <wtf/unicode/CharacterNames.h> |
| |
| #if PLATFORM(IOS) |
| #include "Document.h" |
| #include "EditorClient.h" |
| #include "LogicalSelectionOffsetCaches.h" |
| #include "Page.h" |
| #include "SelectionRect.h" |
| #endif |
| |
| using namespace WTF; |
| using namespace Unicode; |
| |
| namespace WebCore { |
| |
| struct SameSizeAsRenderText : public RenderObject { |
| uint32_t bitfields : 16; |
| #if ENABLE(TEXT_AUTOSIZING) |
| float candidateTextSize; |
| #endif |
| float widths[4]; |
| String text; |
| void* pointers[2]; |
| }; |
| |
| COMPILE_ASSERT(sizeof(RenderText) == sizeof(SameSizeAsRenderText), RenderText_should_stay_small); |
| |
| class SecureTextTimer final : private TimerBase { |
| WTF_MAKE_FAST_ALLOCATED; |
| public: |
| explicit SecureTextTimer(RenderText&); |
| void restart(unsigned offsetAfterLastTypedCharacter); |
| |
| unsigned takeOffsetAfterLastTypedCharacter(); |
| |
| private: |
| void fired() override; |
| RenderText& m_renderer; |
| unsigned m_offsetAfterLastTypedCharacter { 0 }; |
| }; |
| |
| typedef HashMap<RenderText*, std::unique_ptr<SecureTextTimer>> SecureTextTimerMap; |
| |
| static SecureTextTimerMap& secureTextTimers() |
| { |
| static NeverDestroyed<SecureTextTimerMap> map; |
| return map.get(); |
| } |
| |
| inline SecureTextTimer::SecureTextTimer(RenderText& renderer) |
| : m_renderer(renderer) |
| { |
| } |
| |
| inline void SecureTextTimer::restart(unsigned offsetAfterLastTypedCharacter) |
| { |
| m_offsetAfterLastTypedCharacter = offsetAfterLastTypedCharacter; |
| startOneShot(m_renderer.settings().passwordEchoDurationInSeconds()); |
| } |
| |
| inline unsigned SecureTextTimer::takeOffsetAfterLastTypedCharacter() |
| { |
| unsigned offset = m_offsetAfterLastTypedCharacter; |
| m_offsetAfterLastTypedCharacter = 0; |
| return offset; |
| } |
| |
| void SecureTextTimer::fired() |
| { |
| ASSERT(secureTextTimers().get(&m_renderer) == this); |
| m_offsetAfterLastTypedCharacter = 0; |
| m_renderer.setText(m_renderer.text(), true /* forcing setting text as it may be masked later */); |
| } |
| |
| static HashMap<const RenderText*, String>& originalTextMap() |
| { |
| static NeverDestroyed<HashMap<const RenderText*, String>> map; |
| return map; |
| } |
| |
| void makeCapitalized(String* string, UChar previous) |
| { |
| // FIXME: Need to change this to use u_strToTitle instead of u_totitle and to consider locale. |
| |
| if (string->isNull()) |
| return; |
| |
| unsigned length = string->length(); |
| const StringImpl& stringImpl = *string->impl(); |
| |
| if (length >= std::numeric_limits<unsigned>::max()) |
| CRASH(); |
| |
| StringBuffer<UChar> stringWithPrevious(length + 1); |
| stringWithPrevious[0] = previous == noBreakSpace ? ' ' : previous; |
| for (unsigned i = 1; i < length + 1; i++) { |
| // Replace   with a real space since ICU no longer treats   as a word separator. |
| if (stringImpl[i - 1] == noBreakSpace) |
| stringWithPrevious[i] = ' '; |
| else |
| stringWithPrevious[i] = stringImpl[i - 1]; |
| } |
| |
| UBreakIterator* boundary = wordBreakIterator(StringView(stringWithPrevious.characters(), length + 1)); |
| if (!boundary) |
| return; |
| |
| StringBuilder result; |
| result.reserveCapacity(length); |
| |
| int32_t endOfWord; |
| int32_t startOfWord = ubrk_first(boundary); |
| for (endOfWord = ubrk_next(boundary); endOfWord != UBRK_DONE; startOfWord = endOfWord, endOfWord = ubrk_next(boundary)) { |
| if (startOfWord) // Ignore first char of previous string |
| result.append(stringImpl[startOfWord - 1] == noBreakSpace ? noBreakSpace : u_totitle(stringWithPrevious[startOfWord])); |
| for (int i = startOfWord + 1; i < endOfWord; i++) |
| result.append(stringImpl[i - 1]); |
| } |
| |
| *string = result.toString(); |
| } |
| |
| inline RenderText::RenderText(Node& node, const String& text) |
| : RenderObject(node) |
| , m_hasTab(false) |
| , m_linesDirty(false) |
| , m_containsReversedText(false) |
| , m_isAllASCII(text.containsOnlyASCII()) |
| , m_knownToHaveNoOverflowAndNoFallbackFonts(false) |
| , m_useBackslashAsYenSymbol(false) |
| , m_originalTextDiffersFromRendered(false) |
| #if ENABLE(TEXT_AUTOSIZING) |
| , m_candidateComputedTextSize(0) |
| #endif |
| , m_minWidth(-1) |
| , m_maxWidth(-1) |
| , m_beginMinWidth(0) |
| , m_endMinWidth(0) |
| , m_text(text) |
| { |
| ASSERT(!m_text.isNull()); |
| setIsText(); |
| m_canUseSimpleFontCodePath = computeCanUseSimpleFontCodePath(); |
| view().frameView().incrementVisuallyNonEmptyCharacterCount(textLength()); |
| } |
| |
| RenderText::RenderText(Text& textNode, const String& text) |
| : RenderText(static_cast<Node&>(textNode), text) |
| { |
| } |
| |
| RenderText::RenderText(Document& document, const String& text) |
| : RenderText(static_cast<Node&>(document), text) |
| { |
| } |
| |
| RenderText::~RenderText() |
| { |
| if (m_originalTextDiffersFromRendered) |
| originalTextMap().remove(this); |
| } |
| |
| const char* RenderText::renderName() const |
| { |
| return "RenderText"; |
| } |
| |
| Text* RenderText::textNode() const |
| { |
| return downcast<Text>(RenderObject::node()); |
| } |
| |
| bool RenderText::isTextFragment() const |
| { |
| return false; |
| } |
| |
| bool RenderText::computeUseBackslashAsYenSymbol() const |
| { |
| const RenderStyle& style = this->style(); |
| const auto& fontDescription = style.fontDescription(); |
| if (style.fontCascade().useBackslashAsYenSymbol()) |
| return true; |
| if (fontDescription.isSpecifiedFont()) |
| return false; |
| const TextEncoding* encoding = document().decoder() ? &document().decoder()->encoding() : 0; |
| if (encoding && encoding->backslashAsCurrencySymbol() != '\\') |
| return true; |
| return false; |
| } |
| |
| void RenderText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle) |
| { |
| // There is no need to ever schedule repaints from a style change of a text run, since |
| // we already did this for the parent of the text run. |
| // We do have to schedule layouts, though, since a style change can force us to |
| // need to relayout. |
| if (diff == StyleDifferenceLayout) { |
| setNeedsLayoutAndPrefWidthsRecalc(); |
| m_knownToHaveNoOverflowAndNoFallbackFonts = false; |
| } |
| |
| const RenderStyle& newStyle = style(); |
| bool needsResetText = false; |
| if (!oldStyle) { |
| m_useBackslashAsYenSymbol = computeUseBackslashAsYenSymbol(); |
| needsResetText = m_useBackslashAsYenSymbol; |
| // It should really be computed in the c'tor, but during construction we don't have parent yet -and RenderText style == parent()->style() |
| m_canUseSimplifiedTextMeasuring = computeCanUseSimplifiedTextMeasuring(); |
| } else if (oldStyle->fontCascade().useBackslashAsYenSymbol() != newStyle.fontCascade().useBackslashAsYenSymbol()) { |
| m_useBackslashAsYenSymbol = computeUseBackslashAsYenSymbol(); |
| needsResetText = true; |
| } |
| |
| ETextTransform oldTransform = oldStyle ? oldStyle->textTransform() : TTNONE; |
| ETextSecurity oldSecurity = oldStyle ? oldStyle->textSecurity() : TSNONE; |
| if (needsResetText || oldTransform != newStyle.textTransform() || oldSecurity != newStyle.textSecurity()) |
| RenderText::setText(originalText(), true); |
| } |
| |
| void RenderText::removeAndDestroyTextBoxes() |
| { |
| if (!documentBeingDestroyed()) |
| m_lineBoxes.removeAllFromParent(*this); |
| #if !ASSERT_WITH_SECURITY_IMPLICATION_DISABLED |
| else |
| m_lineBoxes.invalidateParentChildLists(); |
| #endif |
| m_lineBoxes.deleteAll(); |
| } |
| |
| void RenderText::willBeDestroyed() |
| { |
| secureTextTimers().remove(this); |
| |
| removeAndDestroyTextBoxes(); |
| RenderObject::willBeDestroyed(); |
| } |
| |
| void RenderText::deleteLineBoxesBeforeSimpleLineLayout() |
| { |
| m_lineBoxes.deleteAll(); |
| } |
| |
| String RenderText::originalText() const |
| { |
| return m_originalTextDiffersFromRendered ? originalTextMap().get(this) : m_text; |
| } |
| |
| void RenderText::absoluteRects(Vector<IntRect>& rects, const LayoutPoint& accumulatedOffset) const |
| { |
| if (auto* layout = simpleLineLayout()) { |
| rects.appendVector(SimpleLineLayout::collectAbsoluteRects(*this, *layout, accumulatedOffset)); |
| return; |
| } |
| rects.appendVector(m_lineBoxes.absoluteRects(accumulatedOffset)); |
| } |
| |
| Vector<IntRect> RenderText::absoluteRectsForRange(unsigned start, unsigned end, bool useSelectionHeight, bool* wasFixed) const |
| { |
| const_cast<RenderText&>(*this).ensureLineBoxes(); |
| |
| // Work around signed/unsigned issues. This function takes unsigneds, and is often passed UINT_MAX |
| // to mean "all the way to the end". InlineTextBox coordinates are unsigneds, so changing this |
| // function to take ints causes various internal mismatches. But selectionRect takes ints, and |
| // passing UINT_MAX to it causes trouble. Ideally we'd change selectionRect to take unsigneds, but |
| // that would cause many ripple effects, so for now we'll just clamp our unsigned parameters to INT_MAX. |
| ASSERT(end == UINT_MAX || end <= INT_MAX); |
| ASSERT(start <= INT_MAX); |
| start = std::min(start, static_cast<unsigned>(INT_MAX)); |
| end = std::min(end, static_cast<unsigned>(INT_MAX)); |
| |
| return m_lineBoxes.absoluteRectsForRange(*this, start, end, useSelectionHeight, wasFixed); |
| } |
| |
| #if PLATFORM(IOS) |
| // This function is similar in spirit to addLineBoxRects, but returns rectangles |
| // which are annotated with additional state which helps the iPhone draw selections in its unique way. |
| // Full annotations are added in this class. |
| void RenderText::collectSelectionRects(Vector<SelectionRect>& rects, unsigned start, unsigned end) |
| { |
| // FIXME: Work around signed/unsigned issues. This function takes unsigneds, and is often passed UINT_MAX |
| // to mean "all the way to the end". InlineTextBox coordinates are unsigneds, so changing this |
| // function to take ints causes various internal mismatches. But selectionRect takes ints, and |
| // passing UINT_MAX to it causes trouble. Ideally we'd change selectionRect to take unsigneds, but |
| // that would cause many ripple effects, so for now we'll just clamp our unsigned parameters to INT_MAX. |
| ASSERT(end == std::numeric_limits<unsigned>::max() || end <= std::numeric_limits<int>::max()); |
| ASSERT(start <= std::numeric_limits<int>::max()); |
| start = std::min(start, static_cast<unsigned>(std::numeric_limits<int>::max())); |
| end = std::min(end, static_cast<unsigned>(std::numeric_limits<int>::max())); |
| |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { |
| LayoutRect rect; |
| // Note, box->end() returns the index of the last character, not the index past it. |
| if (start <= box->start() && box->end() < end) |
| rect = box->localSelectionRect(start, end); |
| else { |
| unsigned realEnd = std::min(box->end() + 1, end); |
| rect = box->localSelectionRect(start, realEnd); |
| if (rect.isEmpty()) |
| continue; |
| } |
| |
| if (box->root().isFirstAfterPageBreak()) { |
| if (box->isHorizontal()) |
| rect.shiftYEdgeTo(box->root().lineTopWithLeading()); |
| else |
| rect.shiftXEdgeTo(box->root().lineTopWithLeading()); |
| } |
| |
| RenderBlock* containingBlock = this->containingBlock(); |
| // Map rect, extended left to leftOffset, and right to rightOffset, through transforms to get minX and maxX. |
| LogicalSelectionOffsetCaches cache(*containingBlock); |
| LayoutUnit leftOffset = containingBlock->logicalLeftSelectionOffset(*containingBlock, box->logicalTop(), cache); |
| LayoutUnit rightOffset = containingBlock->logicalRightSelectionOffset(*containingBlock, box->logicalTop(), cache); |
| LayoutRect extentsRect = rect; |
| if (box->isHorizontal()) { |
| extentsRect.setX(leftOffset); |
| extentsRect.setWidth(rightOffset - leftOffset); |
| } else { |
| extentsRect.setY(leftOffset); |
| extentsRect.setHeight(rightOffset - leftOffset); |
| } |
| extentsRect = localToAbsoluteQuad(FloatRect(extentsRect)).enclosingBoundingBox(); |
| if (!box->isHorizontal()) |
| extentsRect = extentsRect.transposedRect(); |
| bool isFirstOnLine = !box->previousOnLineExists(); |
| bool isLastOnLine = !box->nextOnLineExists(); |
| if (containingBlock->isRubyBase() || containingBlock->isRubyText()) |
| isLastOnLine = !containingBlock->containingBlock()->inlineBoxWrapper()->nextOnLineExists(); |
| |
| bool containsStart = box->start() <= start && box->end() + 1 >= start; |
| bool containsEnd = box->start() <= end && box->end() + 1 >= end; |
| |
| bool isFixed = false; |
| IntRect absRect = localToAbsoluteQuad(FloatRect(rect), UseTransforms, &isFixed).enclosingBoundingBox(); |
| bool boxIsHorizontal = !box->isSVGInlineTextBox() ? box->isHorizontal() : !style().isVerticalWritingMode(); |
| // If the containing block is an inline element, we want to check the inlineBoxWrapper orientation |
| // to determine the orientation of the block. In this case we also use the inlineBoxWrapper to |
| // determine if the element is the last on the line. |
| if (containingBlock->inlineBoxWrapper()) { |
| if (containingBlock->inlineBoxWrapper()->isHorizontal() != boxIsHorizontal) { |
| boxIsHorizontal = containingBlock->inlineBoxWrapper()->isHorizontal(); |
| isLastOnLine = !containingBlock->inlineBoxWrapper()->nextOnLineExists(); |
| } |
| } |
| |
| rects.append(SelectionRect(absRect, box->direction(), extentsRect.x(), extentsRect.maxX(), extentsRect.maxY(), 0, box->isLineBreak(), isFirstOnLine, isLastOnLine, containsStart, containsEnd, boxIsHorizontal, isFixed, containingBlock->isRubyText(), view().pageNumberForBlockProgressionOffset(absRect.x()))); |
| } |
| } |
| #endif |
| |
| Vector<FloatQuad> RenderText::absoluteQuadsClippedToEllipsis() const |
| { |
| if (auto* layout = simpleLineLayout()) { |
| ASSERT(style().textOverflow() != TextOverflowEllipsis); |
| return SimpleLineLayout::collectAbsoluteQuads(*this, *layout, nullptr); |
| } |
| return m_lineBoxes.absoluteQuads(*this, nullptr, RenderTextLineBoxes::ClipToEllipsis); |
| } |
| |
| void RenderText::absoluteQuads(Vector<FloatQuad>& quads, bool* wasFixed) const |
| { |
| if (auto* layout = simpleLineLayout()) { |
| quads.appendVector(SimpleLineLayout::collectAbsoluteQuads(*this, *layout, wasFixed)); |
| return; |
| } |
| quads.appendVector(m_lineBoxes.absoluteQuads(*this, wasFixed, RenderTextLineBoxes::NoClipping)); |
| } |
| |
| Vector<FloatQuad> RenderText::absoluteQuadsForRange(unsigned start, unsigned end, bool useSelectionHeight, bool* wasFixed) const |
| { |
| // Work around signed/unsigned issues. This function takes unsigneds, and is often passed UINT_MAX |
| // to mean "all the way to the end". InlineTextBox coordinates are unsigneds, so changing this |
| // function to take ints causes various internal mismatches. But selectionRect takes ints, and |
| // passing UINT_MAX to it causes trouble. Ideally we'd change selectionRect to take unsigneds, but |
| // that would cause many ripple effects, so for now we'll just clamp our unsigned parameters to INT_MAX. |
| ASSERT(end == UINT_MAX || end <= INT_MAX); |
| ASSERT(start <= INT_MAX); |
| start = std::min(start, static_cast<unsigned>(INT_MAX)); |
| end = std::min(end, static_cast<unsigned>(INT_MAX)); |
| if (simpleLineLayout() && !useSelectionHeight) |
| return collectAbsoluteQuadsForRange(*this, start, end, *simpleLineLayout(), wasFixed); |
| const_cast<RenderText&>(*this).ensureLineBoxes(); |
| return m_lineBoxes.absoluteQuadsForRange(*this, start, end, useSelectionHeight, wasFixed); |
| } |
| |
| Position RenderText::positionForPoint(const LayoutPoint& point) |
| { |
| if (auto* layout = simpleLineLayout()) { |
| auto position = Position(textNode(), SimpleLineLayout::textOffsetForPoint(point, *this, *layout)); |
| ASSERT(position == positionForPoint(point, nullptr).deepEquivalent()); |
| return position; |
| } |
| return positionForPoint(point, nullptr).deepEquivalent(); |
| } |
| |
| VisiblePosition RenderText::positionForPoint(const LayoutPoint& point, const RenderRegion*) |
| { |
| ensureLineBoxes(); |
| return m_lineBoxes.positionForPoint(*this, point); |
| } |
| |
| LayoutRect RenderText::localCaretRect(InlineBox* inlineBox, unsigned caretOffset, LayoutUnit* extraWidthToEndOfLine) |
| { |
| if (!inlineBox) |
| return LayoutRect(); |
| |
| auto& box = downcast<InlineTextBox>(*inlineBox); |
| float left = box.positionForOffset(caretOffset); |
| return box.root().computeCaretRect(left, caretWidth, extraWidthToEndOfLine); |
| } |
| |
| ALWAYS_INLINE float RenderText::widthFromCache(const FontCascade& f, unsigned start, unsigned len, float xPos, HashSet<const Font*>* fallbackFonts, GlyphOverflow* glyphOverflow, const RenderStyle& style) const |
| { |
| if (style.hasTextCombine() && is<RenderCombineText>(*this)) { |
| const RenderCombineText& combineText = downcast<RenderCombineText>(*this); |
| if (combineText.isCombined()) |
| return combineText.combinedTextWidth(f); |
| } |
| |
| if (f.isFixedPitch() && f.fontDescription().variantSettings().isAllNormal() && m_isAllASCII && (!glyphOverflow || !glyphOverflow->computeBounds)) { |
| float monospaceCharacterWidth = f.spaceWidth(); |
| float w = 0; |
| bool isSpace; |
| ASSERT(m_text); |
| StringImpl& text = *m_text.impl(); |
| for (unsigned i = start; i < start + len; i++) { |
| char c = text[i]; |
| if (c <= ' ') { |
| if (c == ' ' || c == '\n') { |
| w += monospaceCharacterWidth; |
| isSpace = true; |
| } else if (c == '\t') { |
| if (style.collapseWhiteSpace()) { |
| w += monospaceCharacterWidth; |
| isSpace = true; |
| } else { |
| w += f.tabWidth(style.tabSize(), xPos + w); |
| isSpace = false; |
| } |
| } else |
| isSpace = false; |
| } else { |
| w += monospaceCharacterWidth; |
| isSpace = false; |
| } |
| if (isSpace && i > start) |
| w += f.wordSpacing(); |
| } |
| return w; |
| } |
| |
| TextRun run = RenderBlock::constructTextRun(*this, start, len, style); |
| run.setCharactersLength(textLength() - start); |
| ASSERT(run.charactersLength() >= run.length()); |
| |
| run.setCharacterScanForCodePath(!canUseSimpleFontCodePath()); |
| run.setTabSize(!style.collapseWhiteSpace(), style.tabSize()); |
| run.setXPos(xPos); |
| return f.width(run, fallbackFonts, glyphOverflow); |
| } |
| |
| inline bool isHangablePunctuationAtLineStart(UChar c) |
| { |
| return U_GET_GC_MASK(c) & (U_GC_PS_MASK | U_GC_PI_MASK | U_GC_PF_MASK); |
| } |
| |
| inline bool isHangablePunctuationAtLineEnd(UChar c) |
| { |
| return U_GET_GC_MASK(c) & (U_GC_PE_MASK | U_GC_PI_MASK | U_GC_PF_MASK); |
| } |
| |
| float RenderText::hangablePunctuationStartWidth(unsigned index) const |
| { |
| unsigned len = textLength(); |
| if (!len || index >= len) |
| return 0; |
| |
| ASSERT(m_text); |
| StringImpl& text = *m_text.impl(); |
| |
| if (!isHangablePunctuationAtLineStart(text[index])) |
| return 0; |
| |
| const RenderStyle& style = this->style(); |
| const FontCascade& font = style.fontCascade(); |
| |
| return widthFromCache(font, index, 1, 0, 0, 0, style); |
| } |
| |
| float RenderText::hangablePunctuationEndWidth(unsigned index) const |
| { |
| unsigned len = textLength(); |
| if (!len || index >= len) |
| return 0; |
| |
| ASSERT(m_text); |
| StringImpl& text = *m_text.impl(); |
| |
| if (!isHangablePunctuationAtLineEnd(text[index])) |
| return 0; |
| |
| const RenderStyle& style = this->style(); |
| const FontCascade& font = style.fontCascade(); |
| |
| return widthFromCache(font, index, 1, 0, 0, 0, style); |
| } |
| |
| bool RenderText::isHangableStopOrComma(UChar c) const |
| { |
| return c == 0x002C || c == 0x002E || c == 0x060C || c == 0x06D4 || c == 0x3001 |
| || c == 0x3002 || c == 0xFF0C || c == 0xFF0E || c == 0xFE50 || c == 0xFE51 |
| || c == 0xFE52 || c == 0xFF61 || c == 0xFF64; |
| } |
| |
| unsigned RenderText::firstCharacterIndexStrippingSpaces() const |
| { |
| if (!style().collapseWhiteSpace()) |
| return 0; |
| |
| ASSERT(m_text); |
| StringImpl& text = *m_text.impl(); |
| |
| unsigned i = 0; |
| for ( ; i < textLength(); ++i) { |
| if (text[i] != ' ' && (text[i] != '\n' || style().preserveNewline()) && text[i] != '\t') |
| break; |
| } |
| return i; |
| } |
| |
| unsigned RenderText::lastCharacterIndexStrippingSpaces() const |
| { |
| if (!textLength()) |
| return 0; |
| |
| if (!style().collapseWhiteSpace()) |
| return textLength() - 1; |
| |
| ASSERT(m_text); |
| StringImpl& text = *m_text.impl(); |
| |
| int i = textLength() - 1; |
| for ( ; i >= 0; --i) { |
| if (text[i] != ' ' && (text[i] != '\n' || style().preserveNewline()) && text[i] != '\t') |
| break; |
| } |
| return i; |
| } |
| |
| void RenderText::trimmedPrefWidths(float leadWidth, |
| float& beginMinW, bool& beginWS, |
| float& endMinW, bool& endWS, |
| bool& hasBreakableChar, bool& hasBreak, |
| float& beginMaxW, float& endMaxW, |
| float& minW, float& maxW, bool& stripFrontSpaces) |
| { |
| const RenderStyle& style = this->style(); |
| bool collapseWhiteSpace = style.collapseWhiteSpace(); |
| if (!collapseWhiteSpace) |
| stripFrontSpaces = false; |
| |
| if (m_hasTab || preferredLogicalWidthsDirty()) |
| computePreferredLogicalWidths(leadWidth); |
| |
| beginWS = !stripFrontSpaces && m_hasBeginWS; |
| endWS = m_hasEndWS; |
| |
| unsigned len = textLength(); |
| |
| if (!len || (stripFrontSpaces && text()->containsOnlyWhitespace())) { |
| beginMinW = 0; |
| endMinW = 0; |
| beginMaxW = 0; |
| endMaxW = 0; |
| minW = 0; |
| maxW = 0; |
| hasBreak = false; |
| return; |
| } |
| |
| minW = m_minWidth; |
| maxW = m_maxWidth; |
| |
| beginMinW = m_beginMinWidth; |
| endMinW = m_endMinWidth; |
| |
| hasBreakableChar = m_hasBreakableChar; |
| hasBreak = m_hasBreak; |
| |
| ASSERT(m_text); |
| StringImpl& text = *m_text.impl(); |
| if (text[0] == space || (text[0] == newlineCharacter && !style.preserveNewline()) || text[0] == '\t') { |
| const FontCascade& font = style.fontCascade(); // FIXME: This ignores first-line. |
| if (stripFrontSpaces) { |
| float spaceWidth = font.width(RenderBlock::constructTextRun(&space, 1, style)); |
| maxW -= spaceWidth; |
| } else |
| maxW += font.wordSpacing(); |
| } |
| |
| stripFrontSpaces = collapseWhiteSpace && m_hasEndWS; |
| |
| if (!style.autoWrap() || minW > maxW) |
| minW = maxW; |
| |
| // Compute our max widths by scanning the string for newlines. |
| if (hasBreak) { |
| const FontCascade& f = style.fontCascade(); // FIXME: This ignores first-line. |
| bool firstLine = true; |
| beginMaxW = maxW; |
| endMaxW = maxW; |
| for (unsigned i = 0; i < len; i++) { |
| unsigned linelen = 0; |
| while (i + linelen < len && text[i + linelen] != '\n') |
| linelen++; |
| |
| if (linelen) { |
| endMaxW = widthFromCache(f, i, linelen, leadWidth + endMaxW, 0, 0, style); |
| if (firstLine) { |
| firstLine = false; |
| leadWidth = 0; |
| beginMaxW = endMaxW; |
| } |
| i += linelen; |
| } else if (firstLine) { |
| beginMaxW = 0; |
| firstLine = false; |
| leadWidth = 0; |
| } |
| |
| if (i == len - 1) |
| // A <pre> run that ends with a newline, as in, e.g., |
| // <pre>Some text\n\n<span>More text</pre> |
| endMaxW = 0; |
| } |
| } |
| } |
| |
| static inline bool isSpaceAccordingToStyle(UChar c, const RenderStyle& style) |
| { |
| return c == ' ' || (c == noBreakSpace && style.nbspMode() == SPACE); |
| } |
| |
| float RenderText::minLogicalWidth() const |
| { |
| if (preferredLogicalWidthsDirty()) |
| const_cast<RenderText*>(this)->computePreferredLogicalWidths(0); |
| |
| return m_minWidth; |
| } |
| |
| float RenderText::maxLogicalWidth() const |
| { |
| if (preferredLogicalWidthsDirty()) |
| const_cast<RenderText*>(this)->computePreferredLogicalWidths(0); |
| |
| return m_maxWidth; |
| } |
| |
| LineBreakIteratorMode mapLineBreakToIteratorMode(LineBreak lineBreak) |
| { |
| switch (lineBreak) { |
| case LineBreakAuto: |
| case LineBreakAfterWhiteSpace: |
| return LineBreakIteratorMode::Default; |
| case LineBreakLoose: |
| return LineBreakIteratorMode::Loose; |
| case LineBreakNormal: |
| return LineBreakIteratorMode::Normal; |
| case LineBreakStrict: |
| return LineBreakIteratorMode::Strict; |
| } |
| ASSERT_NOT_REACHED(); |
| return LineBreakIteratorMode::Default; |
| } |
| |
| void RenderText::computePreferredLogicalWidths(float leadWidth) |
| { |
| HashSet<const Font*> fallbackFonts; |
| GlyphOverflow glyphOverflow; |
| computePreferredLogicalWidths(leadWidth, fallbackFonts, glyphOverflow); |
| if (fallbackFonts.isEmpty() && !glyphOverflow.left && !glyphOverflow.right && !glyphOverflow.top && !glyphOverflow.bottom) |
| m_knownToHaveNoOverflowAndNoFallbackFonts = true; |
| } |
| |
| static inline float hyphenWidth(RenderText& renderer, const FontCascade& font) |
| { |
| const RenderStyle& style = renderer.style(); |
| auto textRun = RenderBlock::constructTextRun(style.hyphenString().string(), style); |
| return font.width(textRun); |
| } |
| |
| static float maxWordFragmentWidth(RenderText& renderer, const RenderStyle& style, const FontCascade& font, StringView word, unsigned minimumPrefixLength, unsigned minimumSuffixLength, unsigned& suffixStart, HashSet<const Font*>& fallbackFonts, GlyphOverflow& glyphOverflow) |
| { |
| suffixStart = 0; |
| if (word.length() <= minimumSuffixLength) |
| return 0; |
| |
| Vector<int, 8> hyphenLocations; |
| ASSERT(word.length() >= minimumSuffixLength); |
| unsigned hyphenLocation = word.length() - minimumSuffixLength; |
| while ((hyphenLocation = lastHyphenLocation(word, hyphenLocation, style.locale())) >= std::max(minimumPrefixLength, 1U)) |
| hyphenLocations.append(hyphenLocation); |
| |
| if (hyphenLocations.isEmpty()) |
| return 0; |
| |
| hyphenLocations.reverse(); |
| |
| // FIXME: Breaking the string at these places in the middle of words is completely broken with complex text. |
| float minimumFragmentWidthToConsider = font.pixelSize() * 5 / 4 + hyphenWidth(renderer, font); |
| float maxFragmentWidth = 0; |
| for (size_t k = 0; k < hyphenLocations.size(); ++k) { |
| int fragmentLength = hyphenLocations[k] - suffixStart; |
| StringBuilder fragmentWithHyphen; |
| fragmentWithHyphen.append(word.substring(suffixStart, fragmentLength)); |
| fragmentWithHyphen.append(style.hyphenString()); |
| |
| TextRun run = RenderBlock::constructTextRun(fragmentWithHyphen.toString(), style); |
| run.setCharactersLength(fragmentWithHyphen.length()); |
| run.setCharacterScanForCodePath(!renderer.canUseSimpleFontCodePath()); |
| float fragmentWidth = font.width(run, &fallbackFonts, &glyphOverflow); |
| |
| // Narrow prefixes are ignored. See tryHyphenating in RenderBlockLineLayout.cpp. |
| if (fragmentWidth <= minimumFragmentWidthToConsider) |
| continue; |
| |
| suffixStart += fragmentLength; |
| maxFragmentWidth = std::max(maxFragmentWidth, fragmentWidth); |
| } |
| |
| return maxFragmentWidth; |
| } |
| |
| void RenderText::computePreferredLogicalWidths(float leadWidth, HashSet<const Font*>& fallbackFonts, GlyphOverflow& glyphOverflow) |
| { |
| ASSERT(m_hasTab || preferredLogicalWidthsDirty() || !m_knownToHaveNoOverflowAndNoFallbackFonts); |
| |
| m_minWidth = 0; |
| m_beginMinWidth = 0; |
| m_endMinWidth = 0; |
| m_maxWidth = 0; |
| |
| float currMaxWidth = 0; |
| m_hasBreakableChar = false; |
| m_hasBreak = false; |
| m_hasTab = false; |
| m_hasBeginWS = false; |
| m_hasEndWS = false; |
| |
| const RenderStyle& style = this->style(); |
| const FontCascade& font = style.fontCascade(); // FIXME: This ignores first-line. |
| float wordSpacing = font.wordSpacing(); |
| unsigned len = textLength(); |
| auto iteratorMode = mapLineBreakToIteratorMode(style.lineBreak()); |
| LazyLineBreakIterator breakIterator(m_text, style.locale(), iteratorMode); |
| bool needsWordSpacing = false; |
| bool ignoringSpaces = false; |
| bool isSpace = false; |
| bool firstWord = true; |
| bool firstLine = true; |
| std::optional<unsigned> nextBreakable; |
| unsigned lastWordBoundary = 0; |
| |
| // Non-zero only when kerning is enabled, in which case we measure words with their trailing |
| // space, then subtract its width. |
| WordTrailingSpace wordTrailingSpace(style); |
| // If automatic hyphenation is allowed, we keep track of the width of the widest word (or word |
| // fragment) encountered so far, and only try hyphenating words that are wider. |
| float maxWordWidth = std::numeric_limits<float>::max(); |
| unsigned minimumPrefixLength = 0; |
| unsigned minimumSuffixLength = 0; |
| if (style.hyphens() == HyphensAuto && canHyphenate(style.locale())) { |
| maxWordWidth = 0; |
| |
| // Map 'hyphenate-limit-{before,after}: auto;' to 2. |
| auto before = style.hyphenationLimitBefore(); |
| minimumPrefixLength = before < 0 ? 2 : before; |
| |
| auto after = style.hyphenationLimitAfter(); |
| minimumSuffixLength = after < 0 ? 2 : after; |
| } |
| |
| std::optional<int> firstGlyphLeftOverflow; |
| |
| bool breakNBSP = style.autoWrap() && style.nbspMode() == SPACE; |
| |
| // Note the deliberate omission of word-wrap and overflow-wrap from this breakAll check. Those |
| // do not affect minimum preferred sizes. Note that break-word is a non-standard value for |
| // word-break, but we support it as though it means break-all. |
| bool breakAll = (style.wordBreak() == BreakAllWordBreak || style.wordBreak() == BreakWordBreak) && style.autoWrap(); |
| bool keepAllWords = style.wordBreak() == KeepAllWordBreak; |
| bool canUseLineBreakShortcut = iteratorMode == LineBreakIteratorMode::Default; |
| |
| for (unsigned i = 0; i < len; i++) { |
| UChar c = uncheckedCharacterAt(i); |
| |
| bool previousCharacterIsSpace = isSpace; |
| |
| bool isNewline = false; |
| if (c == '\n') { |
| if (style.preserveNewline()) { |
| m_hasBreak = true; |
| isNewline = true; |
| isSpace = false; |
| } else |
| isSpace = true; |
| } else if (c == '\t') { |
| if (!style.collapseWhiteSpace()) { |
| m_hasTab = true; |
| isSpace = false; |
| } else |
| isSpace = true; |
| } else |
| isSpace = c == ' '; |
| |
| if ((isSpace || isNewline) && !i) |
| m_hasBeginWS = true; |
| if ((isSpace || isNewline) && i == len - 1) |
| m_hasEndWS = true; |
| |
| ignoringSpaces |= style.collapseWhiteSpace() && previousCharacterIsSpace && isSpace; |
| ignoringSpaces &= isSpace; |
| |
| // Ignore spaces and soft hyphens |
| if (ignoringSpaces) { |
| ASSERT(lastWordBoundary == i); |
| lastWordBoundary++; |
| continue; |
| } else if (c == softHyphen && style.hyphens() != HyphensNone) { |
| ASSERT(i >= lastWordBoundary); |
| currMaxWidth += widthFromCache(font, lastWordBoundary, i - lastWordBoundary, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow, style); |
| if (!firstGlyphLeftOverflow) |
| firstGlyphLeftOverflow = glyphOverflow.left; |
| lastWordBoundary = i + 1; |
| continue; |
| } |
| |
| bool hasBreak = breakAll || isBreakable(breakIterator, i, nextBreakable, breakNBSP, canUseLineBreakShortcut, keepAllWords); |
| bool betweenWords = true; |
| unsigned j = i; |
| while (c != '\n' && !isSpaceAccordingToStyle(c, style) && c != '\t' && (c != softHyphen || style.hyphens() == HyphensNone)) { |
| j++; |
| if (j == len) |
| break; |
| c = uncheckedCharacterAt(j); |
| if (isBreakable(breakIterator, j, nextBreakable, breakNBSP, canUseLineBreakShortcut, keepAllWords) && characterAt(j - 1) != softHyphen) |
| break; |
| if (breakAll) { |
| betweenWords = false; |
| break; |
| } |
| } |
| |
| unsigned wordLen = j - i; |
| if (wordLen) { |
| float currMinWidth = 0; |
| bool isSpace = (j < len) && isSpaceAccordingToStyle(c, style); |
| float w; |
| std::optional<float> wordTrailingSpaceWidth; |
| if (isSpace) |
| wordTrailingSpaceWidth = wordTrailingSpace.width(fallbackFonts); |
| if (wordTrailingSpaceWidth) |
| w = widthFromCache(font, i, wordLen + 1, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow, style) - wordTrailingSpaceWidth.value(); |
| else { |
| w = widthFromCache(font, i, wordLen, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow, style); |
| if (c == softHyphen && style.hyphens() != HyphensNone) |
| currMinWidth = hyphenWidth(*this, font); |
| } |
| |
| if (w > maxWordWidth) { |
| unsigned suffixStart; |
| float maxFragmentWidth = maxWordFragmentWidth(*this, style, font, StringView(m_text).substring(i, wordLen), minimumPrefixLength, minimumSuffixLength, suffixStart, fallbackFonts, glyphOverflow); |
| |
| if (suffixStart) { |
| float suffixWidth; |
| std::optional<float> wordTrailingSpaceWidth; |
| if (isSpace) |
| wordTrailingSpaceWidth = wordTrailingSpace.width(fallbackFonts); |
| if (wordTrailingSpaceWidth) |
| suffixWidth = widthFromCache(font, i + suffixStart, wordLen - suffixStart + 1, leadWidth + currMaxWidth, 0, 0, style) - wordTrailingSpaceWidth.value(); |
| else |
| suffixWidth = widthFromCache(font, i + suffixStart, wordLen - suffixStart, leadWidth + currMaxWidth, 0, 0, style); |
| |
| maxFragmentWidth = std::max(maxFragmentWidth, suffixWidth); |
| |
| currMinWidth += maxFragmentWidth - w; |
| maxWordWidth = std::max(maxWordWidth, maxFragmentWidth); |
| } else |
| maxWordWidth = w; |
| } |
| |
| if (!firstGlyphLeftOverflow) |
| firstGlyphLeftOverflow = glyphOverflow.left; |
| currMinWidth += w; |
| if (betweenWords) { |
| if (lastWordBoundary == i) |
| currMaxWidth += w; |
| else { |
| ASSERT(j >= lastWordBoundary); |
| currMaxWidth += widthFromCache(font, lastWordBoundary, j - lastWordBoundary, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow, style); |
| } |
| lastWordBoundary = j; |
| } |
| |
| bool isCollapsibleWhiteSpace = (j < len) && style.isCollapsibleWhiteSpace(c); |
| if (j < len && style.autoWrap()) |
| m_hasBreakableChar = true; |
| |
| // Add in wordSpacing to our currMaxWidth, but not if this is the last word on a line or the |
| // last word in the run. |
| if ((isSpace || isCollapsibleWhiteSpace) && !containsOnlyWhitespace(j, len-j)) |
| currMaxWidth += wordSpacing; |
| |
| if (firstWord) { |
| firstWord = false; |
| // If the first character in the run is breakable, then we consider ourselves to have a beginning |
| // minimum width of 0, since a break could occur right before our run starts, preventing us from ever |
| // being appended to a previous text run when considering the total minimum width of the containing block. |
| if (hasBreak) |
| m_hasBreakableChar = true; |
| m_beginMinWidth = hasBreak ? 0 : currMinWidth; |
| } |
| m_endMinWidth = currMinWidth; |
| |
| m_minWidth = std::max(currMinWidth, m_minWidth); |
| |
| i += wordLen - 1; |
| } else { |
| // Nowrap can never be broken, so don't bother setting the |
| // breakable character boolean. Pre can only be broken if we encounter a newline. |
| if (style.autoWrap() || isNewline) |
| m_hasBreakableChar = true; |
| |
| if (isNewline) { // Only set if preserveNewline was true and we saw a newline. |
| if (firstLine) { |
| firstLine = false; |
| leadWidth = 0; |
| if (!style.autoWrap()) |
| m_beginMinWidth = currMaxWidth; |
| } |
| |
| if (currMaxWidth > m_maxWidth) |
| m_maxWidth = currMaxWidth; |
| currMaxWidth = 0; |
| } else { |
| TextRun run = RenderBlock::constructTextRun(*this, i, 1, style); |
| run.setCharactersLength(len - i); |
| ASSERT(run.charactersLength() >= run.length()); |
| run.setTabSize(!style.collapseWhiteSpace(), style.tabSize()); |
| run.setXPos(leadWidth + currMaxWidth); |
| |
| currMaxWidth += font.width(run, &fallbackFonts); |
| glyphOverflow.right = 0; |
| needsWordSpacing = isSpace && !previousCharacterIsSpace && i == len - 1; |
| } |
| ASSERT(lastWordBoundary == i); |
| lastWordBoundary++; |
| } |
| } |
| |
| glyphOverflow.left = firstGlyphLeftOverflow.value_or(glyphOverflow.left); |
| |
| if ((needsWordSpacing && len > 1) || (ignoringSpaces && !firstWord)) |
| currMaxWidth += wordSpacing; |
| |
| m_maxWidth = std::max(currMaxWidth, m_maxWidth); |
| |
| if (!style.autoWrap()) |
| m_minWidth = m_maxWidth; |
| |
| if (style.whiteSpace() == PRE) { |
| if (firstLine) |
| m_beginMinWidth = m_maxWidth; |
| m_endMinWidth = currMaxWidth; |
| } |
| |
| setPreferredLogicalWidthsDirty(false); |
| } |
| |
| bool RenderText::isAllCollapsibleWhitespace() const |
| { |
| const RenderStyle& style = this->style(); |
| unsigned length = textLength(); |
| if (is8Bit()) { |
| for (unsigned i = 0; i < length; ++i) { |
| if (!style.isCollapsibleWhiteSpace(characters8()[i])) |
| return false; |
| } |
| return true; |
| } |
| for (unsigned i = 0; i < length; ++i) { |
| if (!style.isCollapsibleWhiteSpace(characters16()[i])) |
| return false; |
| } |
| return true; |
| } |
| |
| bool RenderText::containsOnlyWhitespace(unsigned from, unsigned len) const |
| { |
| ASSERT(m_text); |
| StringImpl& text = *m_text.impl(); |
| unsigned currPos; |
| for (currPos = from; |
| currPos < from + len && (text[currPos] == '\n' || text[currPos] == ' ' || text[currPos] == '\t'); |
| currPos++) { } |
| return currPos >= (from + len); |
| } |
| |
| IntPoint RenderText::firstRunLocation() const |
| { |
| if (auto* layout = simpleLineLayout()) |
| return SimpleLineLayout::computeFirstRunLocation(*this, *layout); |
| |
| return m_lineBoxes.firstRunLocation(); |
| } |
| |
| void RenderText::setSelectionState(SelectionState state) |
| { |
| if (state != SelectionNone) |
| ensureLineBoxes(); |
| |
| RenderObject::setSelectionState(state); |
| |
| if (canUpdateSelectionOnRootLineBoxes()) |
| m_lineBoxes.setSelectionState(*this, state); |
| |
| // The containing block can be null in case of an orphaned tree. |
| RenderBlock* containingBlock = this->containingBlock(); |
| if (containingBlock && !containingBlock->isRenderView()) |
| containingBlock->setSelectionState(state); |
| } |
| |
| void RenderText::setTextWithOffset(const String& text, unsigned offset, unsigned len, bool force) |
| { |
| if (!force && m_text == text) |
| return; |
| |
| int delta = text.length() - textLength(); |
| unsigned end = len ? offset + len - 1 : offset; |
| |
| m_linesDirty = simpleLineLayout() || m_lineBoxes.dirtyRange(*this, offset, end, delta); |
| |
| setText(text, force || m_linesDirty); |
| } |
| |
| static inline bool isInlineFlowOrEmptyText(const RenderObject& renderer) |
| { |
| if (is<RenderInline>(renderer)) |
| return true; |
| if (!is<RenderText>(renderer)) |
| return false; |
| StringImpl* text = downcast<RenderText>(renderer).text(); |
| if (!text) |
| return true; |
| return !text->length(); |
| } |
| |
| UChar RenderText::previousCharacter() const |
| { |
| // find previous text renderer if one exists |
| const RenderObject* previousText = this; |
| while ((previousText = previousText->previousInPreOrder())) |
| if (!isInlineFlowOrEmptyText(*previousText)) |
| break; |
| UChar prev = ' '; |
| if (is<RenderText>(previousText)) { |
| if (StringImpl* previousString = downcast<RenderText>(*previousText).text()) |
| prev = (*previousString)[previousString->length() - 1]; |
| } |
| return prev; |
| } |
| |
| LayoutUnit RenderText::topOfFirstText() const |
| { |
| return firstTextBox()->root().lineTop(); |
| } |
| |
| void applyTextTransform(const RenderStyle& style, String& text, UChar previousCharacter) |
| { |
| switch (style.textTransform()) { |
| case TTNONE: |
| break; |
| case CAPITALIZE: |
| makeCapitalized(&text, previousCharacter); |
| break; |
| case UPPERCASE: |
| text = text.convertToUppercaseWithLocale(style.locale()); |
| break; |
| case LOWERCASE: |
| text = text.convertToLowercaseWithLocale(style.locale()); |
| break; |
| } |
| } |
| |
| void RenderText::setRenderedText(const String& text) |
| { |
| ASSERT(!text.isNull()); |
| |
| String originalText = this->originalText(); |
| |
| m_text = text; |
| |
| if (m_useBackslashAsYenSymbol) |
| m_text.replace('\\', yenSign); |
| |
| ASSERT(m_text); |
| |
| applyTextTransform(style(), m_text, previousCharacter()); |
| |
| switch (style().textSecurity()) { |
| case TSNONE: |
| break; |
| #if !PLATFORM(IOS) |
| // We use the same characters here as for list markers. |
| // See the listMarkerText function in RenderListMarker.cpp. |
| case TSCIRCLE: |
| secureText(whiteBullet); |
| break; |
| case TSDISC: |
| secureText(bullet); |
| break; |
| case TSSQUARE: |
| secureText(blackSquare); |
| break; |
| #else |
| // FIXME: Why this quirk on iOS? |
| case TSCIRCLE: |
| case TSDISC: |
| case TSSQUARE: |
| secureText(blackCircle); |
| break; |
| #endif |
| } |
| |
| ASSERT(!m_text.isNull()); |
| |
| m_isAllASCII = m_text.containsOnlyASCII(); |
| m_canUseSimpleFontCodePath = computeCanUseSimpleFontCodePath(); |
| m_canUseSimplifiedTextMeasuring = computeCanUseSimplifiedTextMeasuring(); |
| |
| if (m_text != originalText) { |
| originalTextMap().set(this, originalText); |
| m_originalTextDiffersFromRendered = true; |
| } else if (m_originalTextDiffersFromRendered) { |
| originalTextMap().remove(this); |
| m_originalTextDiffersFromRendered = false; |
| } |
| } |
| |
| void RenderText::secureText(UChar maskingCharacter) |
| { |
| // This hides the text by replacing all the characters with the masking character. |
| // Offsets within the hidden text have to match offsets within the original text |
| // to handle things like carets and selection, so this won't work right if any |
| // of the characters are surrogate pairs or combining marks. Thus, this function |
| // does not attempt to handle either of those. |
| |
| unsigned length = textLength(); |
| if (!length) |
| return; |
| |
| UChar characterToReveal = 0; |
| unsigned revealedCharactersOffset = 0; |
| |
| if (SecureTextTimer* timer = secureTextTimers().get(this)) { |
| // We take the offset out of the timer to make this one-shot. We count on this being called only once. |
| // If it's called a second time we assume the text is different and a character should not be revealed. |
| revealedCharactersOffset = timer->takeOffsetAfterLastTypedCharacter(); |
| if (revealedCharactersOffset && revealedCharactersOffset <= length) |
| characterToReveal = m_text[--revealedCharactersOffset]; |
| } |
| |
| UChar* characters; |
| m_text = String::createUninitialized(length, characters); |
| |
| for (unsigned i = 0; i < length; ++i) |
| characters[i] = maskingCharacter; |
| if (characterToReveal) |
| characters[revealedCharactersOffset] = characterToReveal; |
| } |
| |
| bool RenderText::computeCanUseSimplifiedTextMeasuring() const |
| { |
| if (!m_canUseSimpleFontCodePath) |
| return false; |
| |
| auto& font = style().fontCascade(); |
| if (font.wordSpacing() || font.letterSpacing()) |
| return false; |
| |
| // Additional check on the font codepath. |
| TextRun run(m_text); |
| run.setCharacterScanForCodePath(false); |
| if (font.codePath(run) != FontCascade::Simple) |
| return false; |
| |
| auto whitespaceIsCollapsed = style().collapseWhiteSpace(); |
| for (unsigned i = 0; i < m_text.length(); ++i) { |
| if ((!whitespaceIsCollapsed && m_text[i] == '\t') || m_text[i] == noBreakSpace || m_text[i] >= HiraganaLetterSmallA) |
| return false; |
| } |
| return true; |
| } |
| |
| void RenderText::setText(const String& text, bool force) |
| { |
| ASSERT(!text.isNull()); |
| |
| if (!force && text == originalText()) |
| return; |
| |
| m_text = text; |
| if (m_originalTextDiffersFromRendered) { |
| originalTextMap().remove(this); |
| m_originalTextDiffersFromRendered = false; |
| } |
| |
| setRenderedText(text); |
| |
| setNeedsLayoutAndPrefWidthsRecalc(); |
| m_knownToHaveNoOverflowAndNoFallbackFonts = false; |
| |
| if (is<RenderBlockFlow>(*parent())) |
| downcast<RenderBlockFlow>(*parent()).invalidateLineLayoutPath(); |
| |
| if (AXObjectCache* cache = document().existingAXObjectCache()) |
| cache->textChanged(this); |
| } |
| |
| String RenderText::textWithoutConvertingBackslashToYenSymbol() const |
| { |
| if (!m_useBackslashAsYenSymbol || style().textSecurity() != TSNONE) |
| return text(); |
| |
| String text = originalText(); |
| applyTextTransform(style(), text, previousCharacter()); |
| return text; |
| } |
| |
| void RenderText::dirtyLineBoxes(bool fullLayout) |
| { |
| if (fullLayout) |
| m_lineBoxes.deleteAll(); |
| else if (!m_linesDirty) |
| m_lineBoxes.dirtyAll(); |
| m_linesDirty = false; |
| } |
| |
| std::unique_ptr<InlineTextBox> RenderText::createTextBox() |
| { |
| return std::make_unique<InlineTextBox>(*this); |
| } |
| |
| void RenderText::positionLineBox(InlineTextBox& textBox) |
| { |
| if (!textBox.len()) |
| return; |
| m_containsReversedText |= !textBox.isLeftToRightDirection(); |
| } |
| |
| void RenderText::ensureLineBoxes() |
| { |
| if (!is<RenderBlockFlow>(*parent())) |
| return; |
| downcast<RenderBlockFlow>(*parent()).ensureLineBoxes(); |
| } |
| |
| const SimpleLineLayout::Layout* RenderText::simpleLineLayout() const |
| { |
| if (!is<RenderBlockFlow>(*parent())) |
| return nullptr; |
| return downcast<RenderBlockFlow>(*parent()).simpleLineLayout(); |
| } |
| |
| float RenderText::width(unsigned from, unsigned len, float xPos, bool firstLine, HashSet<const Font*>* fallbackFonts, GlyphOverflow* glyphOverflow) const |
| { |
| if (from >= textLength()) |
| return 0; |
| |
| if (from + len > textLength()) |
| len = textLength() - from; |
| |
| const RenderStyle& lineStyle = firstLine ? firstLineStyle() : style(); |
| return width(from, len, lineStyle.fontCascade(), xPos, fallbackFonts, glyphOverflow); |
| } |
| |
| float RenderText::width(unsigned from, unsigned len, const FontCascade& f, float xPos, HashSet<const Font*>* fallbackFonts, GlyphOverflow* glyphOverflow) const |
| { |
| ASSERT(from + len <= textLength()); |
| if (!textLength()) |
| return 0; |
| |
| const RenderStyle& style = this->style(); |
| float w; |
| if (&f == &style.fontCascade()) { |
| if (!style.preserveNewline() && !from && len == textLength() && (!glyphOverflow || !glyphOverflow->computeBounds)) { |
| if (fallbackFonts) { |
| ASSERT(glyphOverflow); |
| if (preferredLogicalWidthsDirty() || !m_knownToHaveNoOverflowAndNoFallbackFonts) { |
| const_cast<RenderText*>(this)->computePreferredLogicalWidths(0, *fallbackFonts, *glyphOverflow); |
| if (fallbackFonts->isEmpty() && !glyphOverflow->left && !glyphOverflow->right && !glyphOverflow->top && !glyphOverflow->bottom) |
| m_knownToHaveNoOverflowAndNoFallbackFonts = true; |
| } |
| w = m_maxWidth; |
| } else |
| w = maxLogicalWidth(); |
| } else |
| w = widthFromCache(f, from, len, xPos, fallbackFonts, glyphOverflow, style); |
| } else { |
| TextRun run = RenderBlock::constructTextRun(*this, from, len, style); |
| run.setCharactersLength(textLength() - from); |
| ASSERT(run.charactersLength() >= run.length()); |
| |
| run.setCharacterScanForCodePath(!canUseSimpleFontCodePath()); |
| run.setTabSize(!style.collapseWhiteSpace(), style.tabSize()); |
| run.setXPos(xPos); |
| w = f.width(run, fallbackFonts, glyphOverflow); |
| } |
| |
| return w; |
| } |
| |
| IntRect RenderText::linesBoundingBox() const |
| { |
| if (auto* layout = simpleLineLayout()) |
| return SimpleLineLayout::computeBoundingBox(*this, *layout); |
| |
| return m_lineBoxes.boundingBox(*this); |
| } |
| |
| LayoutRect RenderText::linesVisualOverflowBoundingBox() const |
| { |
| ASSERT(!simpleLineLayout()); |
| return m_lineBoxes.visualOverflowBoundingBox(*this); |
| } |
| |
| LayoutRect RenderText::clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const |
| { |
| RenderObject* rendererToRepaint = containingBlock(); |
| |
| // Do not cross self-painting layer boundaries. |
| RenderObject& enclosingLayerRenderer = enclosingLayer()->renderer(); |
| if (&enclosingLayerRenderer != rendererToRepaint && !rendererToRepaint->isDescendantOf(&enclosingLayerRenderer)) |
| rendererToRepaint = &enclosingLayerRenderer; |
| |
| // The renderer we chose to repaint may be an ancestor of repaintContainer, but we need to do a repaintContainer-relative repaint. |
| if (repaintContainer && repaintContainer != rendererToRepaint && !rendererToRepaint->isDescendantOf(repaintContainer)) |
| return repaintContainer->clippedOverflowRectForRepaint(repaintContainer); |
| |
| return rendererToRepaint->clippedOverflowRectForRepaint(repaintContainer); |
| } |
| |
| LayoutRect RenderText::collectSelectionRectsForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<LayoutRect>* rects) |
| { |
| ASSERT(!needsLayout()); |
| ASSERT(!simpleLineLayout()); |
| |
| if (selectionState() == SelectionNone) |
| return LayoutRect(); |
| if (!containingBlock()) |
| return LayoutRect(); |
| |
| // Now calculate startPos and endPos for painting selection. |
| // We include a selection while endPos > 0 |
| unsigned startPos, endPos; |
| if (selectionState() == SelectionInside) { |
| // We are fully selected. |
| startPos = 0; |
| endPos = textLength(); |
| } else { |
| selectionStartEnd(startPos, endPos); |
| if (selectionState() == SelectionStart) |
| endPos = textLength(); |
| else if (selectionState() == SelectionEnd) |
| startPos = 0; |
| } |
| |
| if (startPos == endPos) |
| return IntRect(); |
| |
| LayoutRect resultRect; |
| if (!rects) |
| resultRect = m_lineBoxes.selectionRectForRange(startPos, endPos); |
| else { |
| m_lineBoxes.collectSelectionRectsForRange(startPos, endPos, *rects); |
| for (auto& rect : *rects) { |
| resultRect.unite(rect); |
| rect = localToContainerQuad(FloatRect(rect), repaintContainer).enclosingBoundingBox(); |
| } |
| } |
| |
| if (clipToVisibleContent) |
| return computeRectForRepaint(resultRect, repaintContainer); |
| return localToContainerQuad(FloatRect(resultRect), repaintContainer).enclosingBoundingBox(); |
| } |
| |
| LayoutRect RenderText::collectSelectionRectsForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<LayoutRect>& rects) |
| { |
| return collectSelectionRectsForLineBoxes(repaintContainer, clipToVisibleContent, &rects); |
| } |
| |
| LayoutRect RenderText::selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent) |
| { |
| return collectSelectionRectsForLineBoxes(repaintContainer, clipToVisibleContent, nullptr); |
| } |
| |
| int RenderText::caretMinOffset() const |
| { |
| if (auto* layout = simpleLineLayout()) |
| return SimpleLineLayout::findCaretMinimumOffset(*this, *layout); |
| return m_lineBoxes.caretMinOffset(); |
| } |
| |
| int RenderText::caretMaxOffset() const |
| { |
| if (auto* layout = simpleLineLayout()) |
| return SimpleLineLayout::findCaretMaximumOffset(*this, *layout); |
| return m_lineBoxes.caretMaxOffset(*this); |
| } |
| |
| unsigned RenderText::countRenderedCharacterOffsetsUntil(unsigned offset) const |
| { |
| ASSERT(!simpleLineLayout()); |
| return m_lineBoxes.countCharacterOffsetsUntil(offset); |
| } |
| |
| bool RenderText::containsRenderedCharacterOffset(unsigned offset) const |
| { |
| ASSERT(!simpleLineLayout()); |
| return m_lineBoxes.containsOffset(*this, offset, RenderTextLineBoxes::CharacterOffset); |
| } |
| |
| bool RenderText::containsCaretOffset(unsigned offset) const |
| { |
| if (auto* layout = simpleLineLayout()) |
| return SimpleLineLayout::containsCaretOffset(*this, *layout, offset); |
| return m_lineBoxes.containsOffset(*this, offset, RenderTextLineBoxes::CaretOffset); |
| } |
| |
| bool RenderText::hasRenderedText() const |
| { |
| if (auto* layout = simpleLineLayout()) |
| return SimpleLineLayout::isTextRendered(*this, *layout); |
| return m_lineBoxes.hasRenderedText(); |
| } |
| |
| int RenderText::previousOffset(int current) const |
| { |
| if (isAllASCII() || m_text.is8Bit()) |
| return current - 1; |
| |
| StringImpl* textImpl = m_text.impl(); |
| CachedTextBreakIterator iterator(StringView(textImpl->characters16(), textImpl->length()), TextBreakIterator::Mode::Caret, nullAtom); |
| auto result = iterator.preceding(current).value_or(current - 1); |
| return result; |
| } |
| |
| #if PLATFORM(COCOA) || PLATFORM(GTK) |
| |
| const UChar hangulChoseongStart = 0x1100; |
| const UChar hangulChoseongEnd = 0x115F; |
| const UChar hangulJungseongStart = 0x1160; |
| const UChar hangulJungseongEnd = 0x11A2; |
| const UChar hangulJongseongStart = 0x11A8; |
| const UChar hangulJongseongEnd = 0x11F9; |
| const UChar hangulSyllableStart = 0xAC00; |
| const UChar hangulSyllableEnd = 0xD7AF; |
| const UChar hangulJongseongCount = 28; |
| |
| enum class HangulState { L, V, T, LV, LVT, Break }; |
| |
| static inline bool isHangulLVT(UChar character) |
| { |
| return (character - hangulSyllableStart) % hangulJongseongCount; |
| } |
| |
| static inline bool isMark(UChar32 character) |
| { |
| return U_GET_GC_MASK(character) & U_GC_M_MASK; |
| } |
| |
| static inline bool isRegionalIndicator(UChar32 character) |
| { |
| // National flag emoji each consists of a pair of regional indicator symbols. |
| return 0x1F1E6 <= character && character <= 0x1F1FF; |
| } |
| |
| static inline bool isInArmenianToLimbuRange(UChar32 character) |
| { |
| return character >= 0x0530 && character < 0x1950; |
| } |
| |
| #endif |
| |
| int RenderText::previousOffsetForBackwardDeletion(int current) const |
| { |
| ASSERT(!m_text.isNull()); |
| StringImpl& text = *m_text.impl(); |
| |
| // FIXME: Unclear why this has so much handrolled code rather than using UBreakIterator. |
| // Also unclear why this is so different from advanceByCombiningCharacterSequence. |
| |
| // FIXME: Seems like this fancier case could be used on all platforms now, no |
| // need for the #else case below. |
| #if PLATFORM(COCOA) || PLATFORM(GTK) |
| bool sawRegionalIndicator = false; |
| bool sawEmojiGroupCandidate = false; |
| bool sawEmojiFitzpatrickModifier = false; |
| |
| while (current > 0) { |
| UChar32 character; |
| U16_PREV(text, 0, current, character); |
| |
| if (sawEmojiGroupCandidate) { |
| sawEmojiGroupCandidate = false; |
| if (character == zeroWidthJoiner) |
| continue; |
| // We could have two emoji group candidates without a joiner in between. |
| // Those should not be treated as a group. |
| U16_FWD_1_UNSAFE(text, current); |
| break; |
| } |
| |
| if (sawEmojiFitzpatrickModifier) { |
| if (isEmojiFitzpatrickModifier(character)) { |
| // Don't treat two emoji modifiers in a row as a group. |
| U16_FWD_1_UNSAFE(text, current); |
| break; |
| } |
| if (!isVariationSelector(character)) |
| break; |
| } |
| |
| if (sawRegionalIndicator) { |
| // We don't check if the pair of regional indicator symbols before current position can actually be combined |
| // into a flag, and just delete it. This may not agree with how the pair is rendered in edge cases, |
| // but is good enough in practice. |
| if (isRegionalIndicator(character)) |
| break; |
| // Don't delete a preceding character that isn't a regional indicator symbol. |
| U16_FWD_1_UNSAFE(text, current); |
| } |
| |
| // We don't combine characters in Armenian ... Limbu range for backward deletion. |
| if (isInArmenianToLimbuRange(character)) |
| break; |
| |
| if (isRegionalIndicator(character)) { |
| sawRegionalIndicator = true; |
| continue; |
| } |
| |
| if (isEmojiFitzpatrickModifier(character)) { |
| sawEmojiFitzpatrickModifier = true; |
| continue; |
| } |
| |
| if (isEmojiGroupCandidate(character)) { |
| sawEmojiGroupCandidate = true; |
| continue; |
| } |
| |
| // FIXME: Why are FF9E and FF9F special cased here? |
| if (!isMark(character) && character != 0xFF9E && character != 0xFF9F) |
| break; |
| } |
| |
| if (current <= 0) |
| return current; |
| |
| // Hangul |
| UChar character = text[current]; |
| if ((character >= hangulChoseongStart && character <= hangulJongseongEnd) || (character >= hangulSyllableStart && character <= hangulSyllableEnd)) { |
| HangulState state; |
| |
| if (character < hangulJungseongStart) |
| state = HangulState::L; |
| else if (character < hangulJongseongStart) |
| state = HangulState::V; |
| else if (character < hangulSyllableStart) |
| state = HangulState::T; |
| else |
| state = isHangulLVT(character) ? HangulState::LVT : HangulState::LV; |
| |
| while (current > 0 && (character = text[current - 1]) >= hangulChoseongStart && character <= hangulSyllableEnd && (character <= hangulJongseongEnd || character >= hangulSyllableStart)) { |
| switch (state) { |
| case HangulState::V: |
| if (character <= hangulChoseongEnd) |
| state = HangulState::L; |
| else if (character >= hangulSyllableStart && character <= hangulSyllableEnd && !isHangulLVT(character)) |
| state = HangulState::LV; |
| else if (character > hangulJungseongEnd) |
| state = HangulState::Break; |
| break; |
| case HangulState::T: |
| if (character >= hangulJungseongStart && character <= hangulJungseongEnd) |
| state = HangulState::V; |
| else if (character >= hangulSyllableStart && character <= hangulSyllableEnd) |
| state = isHangulLVT(character) ? HangulState::LVT : HangulState::LV; |
| else if (character < hangulJungseongStart) |
| state = HangulState::Break; |
| break; |
| default: |
| state = (character < hangulJungseongStart) ? HangulState::L : HangulState::Break; |
| break; |
| } |
| if (state == HangulState::Break) |
| break; |
| --current; |
| } |
| } |
| |
| return current; |
| #else |
| U16_BACK_1(text, 0, current); |
| return current; |
| #endif |
| } |
| |
| int RenderText::nextOffset(int current) const |
| { |
| if (isAllASCII() || m_text.is8Bit()) |
| return current + 1; |
| |
| StringImpl* textImpl = m_text.impl(); |
| CachedTextBreakIterator iterator(StringView(textImpl->characters16(), textImpl->length()), TextBreakIterator::Mode::Caret, nullAtom); |
| auto result = iterator.following(current).value_or(current + 1); |
| return result; |
| } |
| |
| bool RenderText::computeCanUseSimpleFontCodePath() const |
| { |
| if (isAllASCII() || m_text.is8Bit()) |
| return true; |
| return FontCascade::characterRangeCodePath(characters16(), length()) == FontCascade::Simple; |
| } |
| |
| void RenderText::momentarilyRevealLastTypedCharacter(unsigned offsetAfterLastTypedCharacter) |
| { |
| if (style().textSecurity() == TSNONE) |
| return; |
| auto& secureTextTimer = secureTextTimers().add(this, nullptr).iterator->value; |
| if (!secureTextTimer) |
| secureTextTimer = std::make_unique<SecureTextTimer>(*this); |
| secureTextTimer->restart(offsetAfterLastTypedCharacter); |
| } |
| |
| StringView RenderText::stringView(unsigned start, std::optional<unsigned> stop) const |
| { |
| unsigned destination = stop.value_or(textLength()); |
| ASSERT(start <= length()); |
| ASSERT(destination <= length()); |
| ASSERT(start <= destination); |
| if (is8Bit()) |
| return StringView(characters8() + start, destination - start); |
| return StringView(characters16() + start, destination - start); |
| } |
| |
| } // namespace WebCore |
