| /* |
| * (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2004, 2005, 2006, 2007 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 "sky/engine/core/rendering/RenderText.h" |
| |
| #include "sky/engine/core/dom/Text.h" |
| #include "sky/engine/core/editing/PositionWithAffinity.h" |
| #include "sky/engine/core/editing/TextIterator.h" |
| #include "sky/engine/core/editing/VisiblePosition.h" |
| #include "sky/engine/core/frame/FrameView.h" |
| #include "sky/engine/core/frame/Settings.h" |
| #include "sky/engine/core/rendering/EllipsisBox.h" |
| #include "sky/engine/core/rendering/InlineTextBox.h" |
| #include "sky/engine/core/rendering/RenderBlock.h" |
| #include "sky/engine/core/rendering/RenderLayer.h" |
| #include "sky/engine/core/rendering/RenderView.h" |
| #include "sky/engine/core/rendering/TextRunConstructor.h" |
| #include "sky/engine/core/rendering/break_lines.h" |
| #include "sky/engine/platform/fonts/Character.h" |
| #include "sky/engine/platform/fonts/FontCache.h" |
| #include "sky/engine/platform/geometry/FloatQuad.h" |
| #include "sky/engine/platform/text/BidiResolver.h" |
| #include "sky/engine/platform/text/TextBreakIterator.h" |
| #include "sky/engine/platform/text/TextRunIterator.h" |
| #include "sky/engine/wtf/text/StringBuffer.h" |
| #include "sky/engine/wtf/text/StringBuilder.h" |
| #include "sky/engine/wtf/unicode/CharacterNames.h" |
| |
| using namespace WTF; |
| using namespace Unicode; |
| |
| namespace blink { |
| |
| struct SameSizeAsRenderText : public RenderObject { |
| uint32_t bitfields : 16; |
| float widths[4]; |
| String text; |
| void* pointers[2]; |
| }; |
| |
| COMPILE_ASSERT(sizeof(RenderText) == sizeof(SameSizeAsRenderText), RenderText_should_stay_small); |
| |
| RenderText::RenderText(Node* node, PassRefPtr<StringImpl> str) |
| : RenderObject(node) |
| , m_hasTab(false) |
| , m_linesDirty(false) |
| , m_containsReversedText(false) |
| , m_knownToHaveNoOverflowAndNoFallbackFonts(false) |
| , m_minWidth(-1) |
| , m_maxWidth(-1) |
| , m_firstLineMinWidth(0) |
| , m_lastLineLineMinWidth(0) |
| , m_text(str) |
| , m_firstTextBox(0) |
| , m_lastTextBox(0) |
| { |
| ASSERT(m_text); |
| ASSERT(node && !node->isDocumentNode()); |
| |
| m_isAllASCII = m_text.containsOnlyASCII(); |
| m_canUseSimpleFontCodePath = computeCanUseSimpleFontCodePath(); |
| setIsText(); |
| } |
| |
| #if ENABLE(ASSERT) |
| |
| RenderText::~RenderText() |
| { |
| ASSERT(!m_firstTextBox); |
| ASSERT(!m_lastTextBox); |
| } |
| |
| #endif |
| |
| const char* RenderText::renderName() const |
| { |
| return "RenderText"; |
| } |
| |
| void RenderText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle) |
| { |
| // There is no need to ever schedule paint invalidations 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.needsFullLayout()) { |
| setNeedsLayoutAndPrefWidthsRecalc(); |
| m_knownToHaveNoOverflowAndNoFallbackFonts = false; |
| } |
| |
| // This is an optimization that kicks off font load before layout. |
| // In order to make it fast, we only check if the first character of the |
| // text is included in the unicode ranges of the fonts. |
| if (!text().containsOnlyWhitespace()) |
| style()->font().willUseFontData(text().characterStartingAt(0)); |
| } |
| |
| void RenderText::removeAndDestroyTextBoxes() |
| { |
| if (!documentBeingDestroyed()) { |
| if (firstTextBox()) { |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) |
| box->remove(); |
| } else if (parent()) |
| parent()->dirtyLinesFromChangedChild(this); |
| } |
| deleteTextBoxes(); |
| } |
| |
| void RenderText::willBeDestroyed() |
| { |
| removeAndDestroyTextBoxes(); |
| RenderObject::willBeDestroyed(); |
| } |
| |
| void RenderText::extractTextBox(InlineTextBox* box) |
| { |
| checkConsistency(); |
| |
| m_lastTextBox = box->prevTextBox(); |
| if (box == m_firstTextBox) |
| m_firstTextBox = 0; |
| if (box->prevTextBox()) |
| box->prevTextBox()->setNextTextBox(0); |
| box->setPreviousTextBox(0); |
| for (InlineTextBox* curr = box; curr; curr = curr->nextTextBox()) |
| curr->setExtracted(); |
| |
| checkConsistency(); |
| } |
| |
| void RenderText::attachTextBox(InlineTextBox* box) |
| { |
| checkConsistency(); |
| |
| if (m_lastTextBox) { |
| m_lastTextBox->setNextTextBox(box); |
| box->setPreviousTextBox(m_lastTextBox); |
| } else |
| m_firstTextBox = box; |
| InlineTextBox* last = box; |
| for (InlineTextBox* curr = box; curr; curr = curr->nextTextBox()) { |
| curr->setExtracted(false); |
| last = curr; |
| } |
| m_lastTextBox = last; |
| |
| checkConsistency(); |
| } |
| |
| void RenderText::removeTextBox(InlineTextBox* box) |
| { |
| checkConsistency(); |
| |
| if (box == m_firstTextBox) |
| m_firstTextBox = box->nextTextBox(); |
| if (box == m_lastTextBox) |
| m_lastTextBox = box->prevTextBox(); |
| if (box->nextTextBox()) |
| box->nextTextBox()->setPreviousTextBox(box->prevTextBox()); |
| if (box->prevTextBox()) |
| box->prevTextBox()->setNextTextBox(box->nextTextBox()); |
| |
| checkConsistency(); |
| } |
| |
| void RenderText::deleteTextBoxes() |
| { |
| if (firstTextBox()) { |
| InlineTextBox* next; |
| for (InlineTextBox* curr = firstTextBox(); curr; curr = next) { |
| next = curr->nextTextBox(); |
| curr->destroy(); |
| } |
| m_firstTextBox = m_lastTextBox = 0; |
| } |
| } |
| |
| PassRefPtr<StringImpl> RenderText::originalText() const |
| { |
| Node* e = node(); |
| return (e && e->isTextNode()) ? toText(e)->dataImpl() : 0; |
| } |
| |
| String RenderText::plainText() const |
| { |
| if (node()) |
| return blink::plainText(rangeOfContents(node()).get()); |
| |
| // FIXME: this is just a stopgap until TextIterator is adapted to support generated text. |
| StringBuilder plainTextBuilder; |
| for (InlineTextBox* textBox = firstTextBox(); textBox; textBox = textBox->nextTextBox()) { |
| String text = m_text.substring(textBox->start(), textBox->len()).simplifyWhiteSpace(WTF::DoNotStripWhiteSpace); |
| plainTextBuilder.append(text); |
| if (textBox->nextTextBox() && textBox->nextTextBox()->start() > textBox->end() && text.length() && !text.right(1).containsOnlyWhitespace()) |
| plainTextBuilder.append(space); |
| } |
| return plainTextBuilder.toString(); |
| } |
| |
| static FloatRect localQuadForTextBox(InlineTextBox* box, unsigned start, unsigned end, bool useSelectionHeight) |
| { |
| unsigned realEnd = std::min(box->end() + 1, end); |
| LayoutRect r = box->localSelectionRect(start, realEnd); |
| if (r.height()) { |
| if (!useSelectionHeight) { |
| // Change the height and y position (or width and x for vertical text) |
| // because selectionRect uses selection-specific values. |
| r.setHeight(box->height()); |
| r.setY(box->y()); |
| } |
| return FloatRect(r); |
| } |
| return FloatRect(); |
| } |
| |
| void RenderText::absoluteRectsForRange(Vector<IntRect>& rects, unsigned start, unsigned end, bool useSelectionHeight) |
| { |
| // 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)); |
| |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { |
| // Note: box->end() returns the index of the last character, not the index past it |
| if (start <= box->start() && box->end() < end) { |
| FloatRect r = box->calculateBoundaries(); |
| if (useSelectionHeight) { |
| LayoutRect selectionRect = box->localSelectionRect(start, end); |
| r.setHeight(selectionRect.height().toFloat()); |
| r.setY(selectionRect.y().toFloat()); |
| } |
| rects.append(localToAbsoluteQuad(r, 0).enclosingBoundingBox()); |
| } else { |
| // FIXME: This code is wrong. It's converting local to absolute twice. http://webkit.org/b/65722 |
| FloatRect rect = localQuadForTextBox(box, start, end, useSelectionHeight); |
| if (!rect.isZero()) |
| rects.append(localToAbsoluteQuad(rect, 0).enclosingBoundingBox()); |
| } |
| } |
| } |
| |
| static IntRect ellipsisRectForBox(InlineTextBox* box, unsigned startPos, unsigned endPos) |
| { |
| if (!box) |
| return IntRect(); |
| |
| unsigned short truncation = box->truncation(); |
| if (truncation == cNoTruncation) |
| return IntRect(); |
| |
| IntRect rect; |
| if (EllipsisBox* ellipsis = box->root().ellipsisBox()) { |
| int ellipsisStartPosition = std::max<int>(startPos - box->start(), 0); |
| int ellipsisEndPosition = std::min<int>(endPos - box->start(), box->len()); |
| |
| // The ellipsis should be considered to be selected if the end of |
| // the selection is past the beginning of the truncation and the |
| // beginning of the selection is before or at the beginning of the truncation. |
| if (ellipsisEndPosition >= truncation && ellipsisStartPosition <= truncation) |
| return ellipsis->selectionRect(); |
| } |
| |
| return IntRect(); |
| } |
| |
| void RenderText::absoluteQuads(Vector<FloatQuad>& quads, ClippingOption option) const |
| { |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { |
| FloatRect boundaries = box->calculateBoundaries(); |
| |
| // Shorten the width of this text box if it ends in an ellipsis. |
| // FIXME: ellipsisRectForBox should switch to return FloatRect soon with the subpixellayout branch. |
| IntRect ellipsisRect = (option == ClipToEllipsis) ? ellipsisRectForBox(box, 0, textLength()) : IntRect(); |
| if (!ellipsisRect.isEmpty()) { |
| boundaries.setWidth(ellipsisRect.maxX() - boundaries.x()); |
| } |
| quads.append(localToAbsoluteQuad(boundaries, 0)); |
| } |
| } |
| |
| void RenderText::absoluteQuads(Vector<FloatQuad>& quads) const |
| { |
| absoluteQuads(quads, NoClipping); |
| } |
| |
| void RenderText::absoluteQuadsForRange(Vector<FloatQuad>& quads, unsigned start, unsigned end, bool useSelectionHeight) |
| { |
| // 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)); |
| |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { |
| // Note: box->end() returns the index of the last character, not the index past it |
| if (start <= box->start() && box->end() < end) { |
| FloatRect r = box->calculateBoundaries(); |
| if (useSelectionHeight) { |
| LayoutRect selectionRect = box->localSelectionRect(start, end); |
| r.setHeight(selectionRect.height().toFloat()); |
| r.setY(selectionRect.y().toFloat()); |
| } |
| quads.append(localToAbsoluteQuad(r, 0)); |
| } else { |
| FloatRect rect = localQuadForTextBox(box, start, end, useSelectionHeight); |
| if (!rect.isZero()) |
| quads.append(localToAbsoluteQuad(rect, 0)); |
| } |
| } |
| } |
| |
| enum ShouldAffinityBeDownstream { AlwaysDownstream, AlwaysUpstream, UpstreamIfPositionIsNotAtStart }; |
| |
| static bool lineDirectionPointFitsInBox(int pointLineDirection, InlineTextBox* box, ShouldAffinityBeDownstream& shouldAffinityBeDownstream) |
| { |
| shouldAffinityBeDownstream = AlwaysDownstream; |
| |
| // the x coordinate is equal to the left edge of this box |
| // the affinity must be downstream so the position doesn't jump back to the previous line |
| // except when box is the first box in the line |
| if (pointLineDirection <= box->logicalLeft()) { |
| shouldAffinityBeDownstream = !box->prevLeafChild() ? UpstreamIfPositionIsNotAtStart : AlwaysDownstream; |
| return true; |
| } |
| |
| // and the x coordinate is to the left of the right edge of this box |
| // check to see if position goes in this box |
| if (pointLineDirection < box->logicalRight()) { |
| shouldAffinityBeDownstream = UpstreamIfPositionIsNotAtStart; |
| return true; |
| } |
| |
| // box is first on line |
| // and the x coordinate is to the left of the first text box left edge |
| if (!box->prevLeafChildIgnoringLineBreak() && pointLineDirection < box->logicalLeft()) |
| return true; |
| |
| if (!box->nextLeafChildIgnoringLineBreak()) { |
| // box is last on line |
| // and the x coordinate is to the right of the last text box right edge |
| // generate VisiblePosition, use UPSTREAM affinity if possible |
| shouldAffinityBeDownstream = UpstreamIfPositionIsNotAtStart; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static PositionWithAffinity createPositionWithAffinityForBox(const InlineBox* box, int offset, ShouldAffinityBeDownstream shouldAffinityBeDownstream) |
| { |
| EAffinity affinity = VP_DEFAULT_AFFINITY; |
| switch (shouldAffinityBeDownstream) { |
| case AlwaysDownstream: |
| affinity = DOWNSTREAM; |
| break; |
| case AlwaysUpstream: |
| affinity = VP_UPSTREAM_IF_POSSIBLE; |
| break; |
| case UpstreamIfPositionIsNotAtStart: |
| affinity = offset > box->caretMinOffset() ? VP_UPSTREAM_IF_POSSIBLE : DOWNSTREAM; |
| break; |
| } |
| int textStartOffset = box->renderer().isText() ? toRenderText(box->renderer()).textStartOffset() : 0; |
| return box->renderer().createPositionWithAffinity(offset + textStartOffset, affinity); |
| } |
| |
| static PositionWithAffinity createPositionWithAffinityForBoxAfterAdjustingOffsetForBiDi(const InlineTextBox* box, int offset, ShouldAffinityBeDownstream shouldAffinityBeDownstream) |
| { |
| ASSERT(box); |
| ASSERT(offset >= 0); |
| |
| if (offset && static_cast<unsigned>(offset) < box->len()) |
| return createPositionWithAffinityForBox(box, box->start() + offset, shouldAffinityBeDownstream); |
| |
| bool positionIsAtStartOfBox = !offset; |
| if (positionIsAtStartOfBox == box->isLeftToRightDirection()) { |
| // offset is on the left edge |
| |
| const InlineBox* prevBox = box->prevLeafChildIgnoringLineBreak(); |
| if ((prevBox && prevBox->bidiLevel() == box->bidiLevel()) |
| || box->renderer().containingBlock()->style()->direction() == box->direction()) // FIXME: left on 12CBA |
| return createPositionWithAffinityForBox(box, box->caretLeftmostOffset(), shouldAffinityBeDownstream); |
| |
| if (prevBox && prevBox->bidiLevel() > box->bidiLevel()) { |
| // e.g. left of B in aDC12BAb |
| const InlineBox* leftmostBox; |
| do { |
| leftmostBox = prevBox; |
| prevBox = leftmostBox->prevLeafChildIgnoringLineBreak(); |
| } while (prevBox && prevBox->bidiLevel() > box->bidiLevel()); |
| return createPositionWithAffinityForBox(leftmostBox, leftmostBox->caretRightmostOffset(), shouldAffinityBeDownstream); |
| } |
| |
| if (!prevBox || prevBox->bidiLevel() < box->bidiLevel()) { |
| // e.g. left of D in aDC12BAb |
| const InlineBox* rightmostBox; |
| const InlineBox* nextBox = box; |
| do { |
| rightmostBox = nextBox; |
| nextBox = rightmostBox->nextLeafChildIgnoringLineBreak(); |
| } while (nextBox && nextBox->bidiLevel() >= box->bidiLevel()); |
| return createPositionWithAffinityForBox(rightmostBox, |
| box->isLeftToRightDirection() ? rightmostBox->caretMaxOffset() : rightmostBox->caretMinOffset(), shouldAffinityBeDownstream); |
| } |
| |
| return createPositionWithAffinityForBox(box, box->caretRightmostOffset(), shouldAffinityBeDownstream); |
| } |
| |
| const InlineBox* nextBox = box->nextLeafChildIgnoringLineBreak(); |
| if ((nextBox && nextBox->bidiLevel() == box->bidiLevel()) |
| || box->renderer().containingBlock()->style()->direction() == box->direction()) |
| return createPositionWithAffinityForBox(box, box->caretRightmostOffset(), shouldAffinityBeDownstream); |
| |
| // offset is on the right edge |
| if (nextBox && nextBox->bidiLevel() > box->bidiLevel()) { |
| // e.g. right of C in aDC12BAb |
| const InlineBox* rightmostBox; |
| do { |
| rightmostBox = nextBox; |
| nextBox = rightmostBox->nextLeafChildIgnoringLineBreak(); |
| } while (nextBox && nextBox->bidiLevel() > box->bidiLevel()); |
| return createPositionWithAffinityForBox(rightmostBox, rightmostBox->caretLeftmostOffset(), shouldAffinityBeDownstream); |
| } |
| |
| if (!nextBox || nextBox->bidiLevel() < box->bidiLevel()) { |
| // e.g. right of A in aDC12BAb |
| const InlineBox* leftmostBox; |
| const InlineBox* prevBox = box; |
| do { |
| leftmostBox = prevBox; |
| prevBox = leftmostBox->prevLeafChildIgnoringLineBreak(); |
| } while (prevBox && prevBox->bidiLevel() >= box->bidiLevel()); |
| return createPositionWithAffinityForBox(leftmostBox, |
| box->isLeftToRightDirection() ? leftmostBox->caretMinOffset() : leftmostBox->caretMaxOffset(), shouldAffinityBeDownstream); |
| } |
| |
| return createPositionWithAffinityForBox(box, box->caretLeftmostOffset(), shouldAffinityBeDownstream); |
| } |
| |
| PositionWithAffinity RenderText::positionForPoint(const LayoutPoint& point) |
| { |
| if (!firstTextBox() || textLength() == 0) |
| return createPositionWithAffinity(0, DOWNSTREAM); |
| |
| LayoutUnit pointLineDirection = point.x(); |
| LayoutUnit pointBlockDirection = point.y(); |
| |
| InlineTextBox* lastBox = 0; |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { |
| if (box->isLineBreak() && !box->prevLeafChild() && box->nextLeafChild() && !box->nextLeafChild()->isLineBreak()) |
| box = box->nextTextBox(); |
| |
| RootInlineBox& rootBox = box->root(); |
| LayoutUnit top = std::min(rootBox.selectionTop(), rootBox.lineTop()); |
| if (pointBlockDirection > top || pointBlockDirection == top) { |
| LayoutUnit bottom = rootBox.selectionBottom(); |
| if (rootBox.nextRootBox()) |
| bottom = std::min(bottom, rootBox.nextRootBox()->lineTop()); |
| |
| if (pointBlockDirection < bottom) { |
| ShouldAffinityBeDownstream shouldAffinityBeDownstream; |
| if (lineDirectionPointFitsInBox(pointLineDirection, box, shouldAffinityBeDownstream)) |
| return createPositionWithAffinityForBoxAfterAdjustingOffsetForBiDi(box, box->offsetForPosition(pointLineDirection.toFloat()), shouldAffinityBeDownstream); |
| } |
| } |
| lastBox = box; |
| } |
| |
| if (lastBox) { |
| ShouldAffinityBeDownstream shouldAffinityBeDownstream; |
| lineDirectionPointFitsInBox(pointLineDirection, lastBox, shouldAffinityBeDownstream); |
| return createPositionWithAffinityForBoxAfterAdjustingOffsetForBiDi(lastBox, lastBox->offsetForPosition(pointLineDirection.toFloat()) + lastBox->start(), shouldAffinityBeDownstream); |
| } |
| return createPositionWithAffinity(0, DOWNSTREAM); |
| } |
| |
| LayoutRect RenderText::localCaretRect(InlineBox* inlineBox, int caretOffset, LayoutUnit* extraWidthToEndOfLine) |
| { |
| if (!inlineBox) |
| return LayoutRect(); |
| |
| ASSERT(inlineBox->isInlineTextBox()); |
| if (!inlineBox->isInlineTextBox()) |
| return LayoutRect(); |
| |
| InlineTextBox* box = toInlineTextBox(inlineBox); |
| |
| int height = box->root().selectionHeight(); |
| int top = box->root().selectionTop(); |
| |
| // Go ahead and round left to snap it to the nearest pixel. |
| float left = box->positionForOffset(caretOffset); |
| |
| // Distribute the caret's width to either side of the offset. |
| int caretWidthLeftOfOffset = caretWidth / 2; |
| left -= caretWidthLeftOfOffset; |
| int caretWidthRightOfOffset = caretWidth - caretWidthLeftOfOffset; |
| |
| left = roundf(left); |
| |
| float rootLeft = box->root().logicalLeft(); |
| float rootRight = box->root().logicalRight(); |
| |
| // FIXME: should we use the width of the root inline box or the |
| // width of the containing block for this? |
| if (extraWidthToEndOfLine) |
| *extraWidthToEndOfLine = (box->root().logicalWidth() + rootLeft) - (left + 1); |
| |
| RenderBlock* cb = containingBlock(); |
| RenderStyle* cbStyle = cb->style(); |
| |
| float leftEdge; |
| float rightEdge; |
| leftEdge = std::min<float>(0, rootLeft); |
| rightEdge = std::max<float>(cb->logicalWidth().toFloat(), rootRight); |
| |
| bool rightAligned = false; |
| switch (cbStyle->textAlign()) { |
| case RIGHT: |
| rightAligned = true; |
| break; |
| case LEFT: |
| case CENTER: |
| break; |
| case JUSTIFY: |
| case TASTART: |
| rightAligned = !cbStyle->isLeftToRightDirection(); |
| break; |
| case TAEND: |
| rightAligned = cbStyle->isLeftToRightDirection(); |
| break; |
| } |
| |
| if (rightAligned) { |
| left = std::max(left, leftEdge); |
| left = std::min(left, rootRight - caretWidth); |
| } else { |
| left = std::min(left, rightEdge - caretWidthRightOfOffset); |
| left = std::max(left, rootLeft); |
| } |
| |
| return IntRect(left, top, caretWidth, height); |
| } |
| |
| ALWAYS_INLINE float RenderText::widthFromCache(const Font& f, int start, int len, float xPos, TextDirection textDirection, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const |
| { |
| if (f.isFixedPitch() && f.fontDescription().variant() == FontVariantNormal && m_isAllASCII && (!glyphOverflow || !glyphOverflow->computeBounds)) { |
| float monospaceCharacterWidth = f.spaceWidth(); |
| float w = 0; |
| bool isSpace; |
| ASSERT(m_text); |
| StringImpl& text = *m_text.impl(); |
| for (int i = start; i < start + len; i++) { |
| char c = text[i]; |
| if (c <= space) { |
| if (c == space || c == newlineCharacter) { |
| w += monospaceCharacterWidth; |
| isSpace = true; |
| } else if (c == characterTabulation) { |
| 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.fontDescription().wordSpacing(); |
| } |
| return w; |
| } |
| |
| TextRun run = constructTextRun(const_cast<RenderText*>(this), f, this, start, len, style(), textDirection); |
| run.setCharactersLength(textLength() - start); |
| ASSERT(run.charactersLength() >= run.length()); |
| |
| run.setCharacterScanForCodePath(!canUseSimpleFontCodePath()); |
| run.setTabSize(!style()->collapseWhiteSpace(), style()->tabSize()); |
| run.setXPos(xPos); |
| FontCachePurgePreventer fontCachePurgePreventer; |
| return f.width(run, fallbackFonts, glyphOverflow); |
| } |
| |
| void RenderText::trimmedPrefWidths(float leadWidth, |
| float& firstLineMinWidth, bool& hasBreakableStart, |
| float& lastLineMinWidth, bool& hasBreakableEnd, |
| bool& hasBreakableChar, bool& hasBreak, |
| float& firstLineMaxWidth, float& lastLineMaxWidth, |
| float& minWidth, float& maxWidth, bool& stripFrontSpaces, |
| TextDirection direction) |
| { |
| bool collapseWhiteSpace = style()->collapseWhiteSpace(); |
| if (!collapseWhiteSpace) |
| stripFrontSpaces = false; |
| |
| if (m_hasTab || preferredLogicalWidthsDirty()) |
| computePreferredLogicalWidths(leadWidth); |
| |
| hasBreakableStart = !stripFrontSpaces && m_hasBreakableStart; |
| hasBreakableEnd = m_hasBreakableEnd; |
| |
| int len = textLength(); |
| |
| if (!len || (stripFrontSpaces && text().impl()->containsOnlyWhitespace())) { |
| firstLineMinWidth = 0; |
| lastLineMinWidth = 0; |
| firstLineMaxWidth = 0; |
| lastLineMaxWidth = 0; |
| minWidth = 0; |
| maxWidth = 0; |
| hasBreak = false; |
| return; |
| } |
| |
| minWidth = m_minWidth; |
| maxWidth = m_maxWidth; |
| |
| firstLineMinWidth = m_firstLineMinWidth; |
| lastLineMinWidth = m_lastLineLineMinWidth; |
| |
| 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] == characterTabulation) { |
| const Font& font = style()->font(); // FIXME: This ignores first-line. |
| if (stripFrontSpaces) { |
| const UChar spaceChar = space; |
| float spaceWidth = font.width(constructTextRun(this, font, &spaceChar, 1, style(), direction)); |
| maxWidth -= spaceWidth; |
| } else { |
| maxWidth += font.fontDescription().wordSpacing(); |
| } |
| } |
| |
| stripFrontSpaces = collapseWhiteSpace && m_hasEndWhiteSpace; |
| |
| if (!style()->autoWrap() || minWidth > maxWidth) |
| minWidth = maxWidth; |
| |
| // Compute our max widths by scanning the string for newlines. |
| if (hasBreak) { |
| const Font& f = style()->font(); // FIXME: This ignores first-line. |
| bool firstLine = true; |
| firstLineMaxWidth = maxWidth; |
| lastLineMaxWidth = maxWidth; |
| for (int i = 0; i < len; i++) { |
| int linelen = 0; |
| while (i + linelen < len && text[i + linelen] != newlineCharacter) |
| linelen++; |
| |
| if (linelen) { |
| lastLineMaxWidth = widthFromCache(f, i, linelen, leadWidth + lastLineMaxWidth, direction, 0, 0); |
| if (firstLine) { |
| firstLine = false; |
| leadWidth = 0; |
| firstLineMaxWidth = lastLineMaxWidth; |
| } |
| i += linelen; |
| } else if (firstLine) { |
| firstLineMaxWidth = 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> |
| lastLineMaxWidth = 0; |
| } |
| } |
| } |
| } |
| |
| 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; |
| } |
| |
| void RenderText::computePreferredLogicalWidths(float leadWidth) |
| { |
| HashSet<const SimpleFontData*> fallbackFonts; |
| GlyphOverflow glyphOverflow; |
| computePreferredLogicalWidths(leadWidth, fallbackFonts, glyphOverflow); |
| |
| // We shouldn't change our mind once we "know". |
| ASSERT(!m_knownToHaveNoOverflowAndNoFallbackFonts || (fallbackFonts.isEmpty() && glyphOverflow.isZero())); |
| m_knownToHaveNoOverflowAndNoFallbackFonts = fallbackFonts.isEmpty() && glyphOverflow.isZero(); |
| } |
| |
| static inline float hyphenWidth(RenderText* renderer, const Font& font, TextDirection direction) |
| { |
| RenderStyle* style = renderer->style(); |
| return font.width(constructTextRun(renderer, font, style->hyphenString().string(), style, direction)); |
| } |
| |
| void RenderText::computePreferredLogicalWidths(float leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow& glyphOverflow) |
| { |
| ASSERT(m_hasTab || preferredLogicalWidthsDirty() || !m_knownToHaveNoOverflowAndNoFallbackFonts); |
| |
| m_minWidth = 0; |
| m_maxWidth = 0; |
| m_firstLineMinWidth = 0; |
| m_lastLineLineMinWidth = 0; |
| |
| float currMinWidth = 0; |
| float currMaxWidth = 0; |
| m_hasBreakableChar = false; |
| m_hasBreak = false; |
| m_hasTab = false; |
| m_hasBreakableStart = false; |
| m_hasBreakableEnd = false; |
| m_hasEndWhiteSpace = false; |
| |
| RenderStyle* styleToUse = style(); |
| const Font& f = styleToUse->font(); // FIXME: This ignores first-line. |
| float wordSpacing = styleToUse->wordSpacing(); |
| int len = textLength(); |
| LazyLineBreakIterator breakIterator(m_text, styleToUse->locale()); |
| bool needsWordSpacing = false; |
| bool ignoringSpaces = false; |
| bool isSpace = false; |
| bool firstWord = true; |
| bool firstLine = true; |
| int nextBreakable = -1; |
| int lastWordBoundary = 0; |
| float cachedWordTrailingSpaceWidth[2] = { 0, 0 }; // LTR, RTL |
| |
| int firstGlyphLeftOverflow = -1; |
| |
| bool breakAll = (styleToUse->wordBreak() == BreakAllWordBreak || styleToUse->wordBreak() == BreakWordBreak) && styleToUse->autoWrap(); |
| |
| TextRun textRun(text()); |
| BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver; |
| |
| BidiCharacterRun* run; |
| TextDirection textDirection = styleToUse->direction(); |
| if (isOverride(styleToUse->unicodeBidi())) { |
| run = 0; |
| } else { |
| BidiStatus status(textDirection, false); |
| bidiResolver.setStatus(status); |
| bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&textRun, 0)); |
| bool hardLineBreak = false; |
| bool reorderRuns = false; |
| bidiResolver.createBidiRunsForLine(TextRunIterator(&textRun, textRun.length()), NoVisualOverride, hardLineBreak, reorderRuns); |
| BidiRunList<BidiCharacterRun>& bidiRuns = bidiResolver.runs(); |
| run = bidiRuns.firstRun(); |
| } |
| |
| for (int i = 0; i < len; i++) { |
| UChar c = uncheckedCharacterAt(i); |
| |
| if (run) { |
| // Treat adjacent runs with the same resolved directionality |
| // (TextDirection as opposed to WTF::Unicode::Direction) as belonging |
| // to the same run to avoid breaking unnecessarily. |
| while (i >= run->stop() || (run->next() && run->next()->direction() == run->direction())) |
| run = run->next(); |
| |
| ASSERT(run); |
| ASSERT(i <= run->stop()); |
| textDirection = run->direction(); |
| } |
| |
| bool previousCharacterIsSpace = isSpace; |
| bool isNewline = false; |
| if (c == newlineCharacter) { |
| if (styleToUse->preserveNewline()) { |
| m_hasBreak = true; |
| isNewline = true; |
| isSpace = false; |
| } else |
| isSpace = true; |
| } else if (c == characterTabulation) { |
| if (!styleToUse->collapseWhiteSpace()) { |
| m_hasTab = true; |
| isSpace = false; |
| } else |
| isSpace = true; |
| } else { |
| isSpace = c == space; |
| } |
| |
| bool isBreakableLocation = isNewline || (isSpace && styleToUse->autoWrap()); |
| if (!i) |
| m_hasBreakableStart = isBreakableLocation; |
| if (i == len - 1) { |
| m_hasBreakableEnd = isBreakableLocation; |
| m_hasEndWhiteSpace = isNewline || isSpace; |
| } |
| |
| if (!ignoringSpaces && styleToUse->collapseWhiteSpace() && previousCharacterIsSpace && isSpace) |
| ignoringSpaces = true; |
| |
| if (ignoringSpaces && !isSpace) |
| ignoringSpaces = false; |
| |
| // Ignore spaces and soft hyphens |
| if (ignoringSpaces) { |
| ASSERT(lastWordBoundary == i); |
| lastWordBoundary++; |
| continue; |
| } else if (c == softHyphen) { |
| currMaxWidth += widthFromCache(f, lastWordBoundary, i - lastWordBoundary, leadWidth + currMaxWidth, textDirection, &fallbackFonts, &glyphOverflow); |
| if (firstGlyphLeftOverflow < 0) |
| firstGlyphLeftOverflow = glyphOverflow.left; |
| lastWordBoundary = i + 1; |
| continue; |
| } |
| |
| bool hasBreak = breakAll || isBreakable(breakIterator, i, nextBreakable); |
| bool betweenWords = true; |
| int j = i; |
| while (c != newlineCharacter && c != space && c != characterTabulation && (c != softHyphen)) { |
| j++; |
| if (j == len) |
| break; |
| c = uncheckedCharacterAt(j); |
| if (isBreakable(breakIterator, j, nextBreakable) && characterAt(j - 1) != softHyphen) |
| break; |
| if (breakAll) { |
| betweenWords = false; |
| break; |
| } |
| } |
| |
| // Terminate word boundary at bidi run boundary. |
| if (run) |
| j = std::min(j, run->stop() + 1); |
| int wordLen = j - i; |
| if (wordLen) { |
| bool isSpace = (j < len) && c == space; |
| |
| // Non-zero only when kerning is enabled, in which case we measure words with their trailing |
| // space, then subtract its width. |
| float wordTrailingSpaceWidth = 0; |
| if (isSpace && (f.fontDescription().typesettingFeatures() & Kerning)) { |
| ASSERT(textDirection >=0 && textDirection <= 1); |
| if (!cachedWordTrailingSpaceWidth[textDirection]) |
| cachedWordTrailingSpaceWidth[textDirection] = f.width(constructTextRun(this, f, &space, 1, styleToUse, textDirection)) + wordSpacing; |
| wordTrailingSpaceWidth = cachedWordTrailingSpaceWidth[textDirection]; |
| } |
| |
| float w; |
| if (wordTrailingSpaceWidth && isSpace) |
| w = widthFromCache(f, i, wordLen + 1, leadWidth + currMaxWidth, textDirection, &fallbackFonts, &glyphOverflow) - wordTrailingSpaceWidth; |
| else { |
| w = widthFromCache(f, i, wordLen, leadWidth + currMaxWidth, textDirection, &fallbackFonts, &glyphOverflow); |
| if (c == softHyphen) |
| currMinWidth += hyphenWidth(this, f, textDirection); |
| } |
| |
| if (firstGlyphLeftOverflow < 0) |
| firstGlyphLeftOverflow = glyphOverflow.left; |
| currMinWidth += w; |
| if (betweenWords) { |
| if (lastWordBoundary == i) |
| currMaxWidth += w; |
| else |
| currMaxWidth += widthFromCache(f, lastWordBoundary, j - lastWordBoundary, leadWidth + currMaxWidth, textDirection, &fallbackFonts, &glyphOverflow); |
| lastWordBoundary = j; |
| } |
| |
| bool isCollapsibleWhiteSpace = (j < len) && styleToUse->isCollapsibleWhiteSpace(c); |
| if (j < len && styleToUse->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 (wordSpacing && (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_firstLineMinWidth = hasBreak ? 0 : currMinWidth; |
| } |
| m_lastLineLineMinWidth = currMinWidth; |
| |
| if (currMinWidth > m_minWidth) |
| m_minWidth = currMinWidth; |
| currMinWidth = 0; |
| |
| 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 (currMinWidth > m_minWidth) |
| m_minWidth = currMinWidth; |
| currMinWidth = 0; |
| |
| if (isNewline) { // Only set if preserveNewline was true and we saw a newline. |
| if (firstLine) { |
| firstLine = false; |
| leadWidth = 0; |
| if (!styleToUse->autoWrap()) |
| m_firstLineMinWidth = currMaxWidth; |
| } |
| |
| if (currMaxWidth > m_maxWidth) |
| m_maxWidth = currMaxWidth; |
| currMaxWidth = 0; |
| } else { |
| TextRun run = constructTextRun(this, f, this, i, 1, styleToUse, textDirection); |
| run.setCharactersLength(len - i); |
| ASSERT(run.charactersLength() >= run.length()); |
| run.setTabSize(!style()->collapseWhiteSpace(), style()->tabSize()); |
| run.setXPos(leadWidth + currMaxWidth); |
| |
| currMaxWidth += f.width(run); |
| glyphOverflow.right = 0; |
| needsWordSpacing = isSpace && !previousCharacterIsSpace && i == len - 1; |
| } |
| ASSERT(lastWordBoundary == i); |
| lastWordBoundary++; |
| } |
| } |
| if (run) |
| bidiResolver.runs().deleteRuns(); |
| |
| if (firstGlyphLeftOverflow > 0) |
| glyphOverflow.left = firstGlyphLeftOverflow; |
| |
| if ((needsWordSpacing && len > 1) || (ignoringSpaces && !firstWord)) |
| currMaxWidth += wordSpacing; |
| |
| m_minWidth = std::max(currMinWidth, m_minWidth); |
| m_maxWidth = std::max(currMaxWidth, m_maxWidth); |
| |
| if (!styleToUse->autoWrap()) |
| m_minWidth = m_maxWidth; |
| |
| if (styleToUse->whiteSpace() == PRE) { |
| if (firstLine) |
| m_firstLineMinWidth = m_maxWidth; |
| m_lastLineLineMinWidth = currMaxWidth; |
| } |
| |
| clearPreferredLogicalWidthsDirty(); |
| } |
| |
| bool RenderText::isAllCollapsibleWhitespace() const |
| { |
| 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] == newlineCharacter || text[currPos] == space || text[currPos] == characterTabulation); |
| currPos++) { } |
| return currPos >= (from + len); |
| } |
| |
| FloatPoint RenderText::firstRunOrigin() const |
| { |
| return IntPoint(firstRunX(), firstRunY()); |
| } |
| |
| float RenderText::firstRunX() const |
| { |
| return m_firstTextBox ? m_firstTextBox->x() : 0; |
| } |
| |
| float RenderText::firstRunY() const |
| { |
| return m_firstTextBox ? m_firstTextBox->y() : 0; |
| } |
| |
| void RenderText::setSelectionState(SelectionState state) |
| { |
| RenderObject::setSelectionState(state); |
| |
| if (canUpdateSelectionOnRootLineBoxes()) { |
| if (state == SelectionStart || state == SelectionEnd || state == SelectionBoth) { |
| int startPos, endPos; |
| selectionStartEnd(startPos, endPos); |
| if (selectionState() == SelectionStart) { |
| endPos = textLength(); |
| |
| // to handle selection from end of text to end of line |
| if (startPos && startPos == endPos) |
| startPos = endPos - 1; |
| } else if (selectionState() == SelectionEnd) |
| startPos = 0; |
| |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { |
| if (box->isSelected(startPos, endPos)) { |
| box->root().setHasSelectedChildren(true); |
| } |
| } |
| } else { |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) { |
| box->root().setHasSelectedChildren(state == SelectionInside); |
| } |
| } |
| } |
| |
| // 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(PassRefPtr<StringImpl> text, unsigned offset, unsigned len, bool force) |
| { |
| if (!force && equal(m_text.impl(), text.get())) |
| return; |
| |
| unsigned oldLen = textLength(); |
| unsigned newLen = text->length(); |
| int delta = newLen - oldLen; |
| unsigned end = len ? offset + len - 1 : offset; |
| |
| RootInlineBox* firstRootBox = 0; |
| RootInlineBox* lastRootBox = 0; |
| |
| bool dirtiedLines = false; |
| |
| // Dirty all text boxes that include characters in between offset and offset+len. |
| for (InlineTextBox* curr = firstTextBox(); curr; curr = curr->nextTextBox()) { |
| // FIXME: This shouldn't rely on the end of a dirty line box. See https://bugs.webkit.org/show_bug.cgi?id=97264 |
| // Text run is entirely before the affected range. |
| if (curr->end() < offset) |
| continue; |
| |
| // Text run is entirely after the affected range. |
| if (curr->start() > end) { |
| curr->offsetRun(delta); |
| RootInlineBox* root = &curr->root(); |
| if (!firstRootBox) { |
| firstRootBox = root; |
| // The affected area was in between two runs. Go ahead and mark the root box of |
| // the run after the affected area as dirty. |
| firstRootBox->markDirty(); |
| dirtiedLines = true; |
| } |
| lastRootBox = root; |
| } else if (curr->end() >= offset && curr->end() <= end) { |
| // Text run overlaps with the left end of the affected range. |
| curr->dirtyLineBoxes(); |
| dirtiedLines = true; |
| } else if (curr->start() <= offset && curr->end() >= end) { |
| // Text run subsumes the affected range. |
| curr->dirtyLineBoxes(); |
| dirtiedLines = true; |
| } else if (curr->start() <= end && curr->end() >= end) { |
| // Text run overlaps with right end of the affected range. |
| curr->dirtyLineBoxes(); |
| dirtiedLines = true; |
| } |
| } |
| |
| // Now we have to walk all of the clean lines and adjust their cached line break information |
| // to reflect our updated offsets. |
| if (lastRootBox) |
| lastRootBox = lastRootBox->nextRootBox(); |
| if (firstRootBox) { |
| RootInlineBox* prev = firstRootBox->prevRootBox(); |
| if (prev) |
| firstRootBox = prev; |
| } else if (lastTextBox()) { |
| ASSERT(!lastRootBox); |
| firstRootBox = &lastTextBox()->root(); |
| firstRootBox->markDirty(); |
| dirtiedLines = true; |
| } |
| for (RootInlineBox* curr = firstRootBox; curr && curr != lastRootBox; curr = curr->nextRootBox()) { |
| if (curr->lineBreakObj() == this && curr->lineBreakPos() > end) |
| curr->setLineBreakPos(clampToInteger(curr->lineBreakPos() + delta)); |
| } |
| |
| // If the text node is empty, dirty the line where new text will be inserted. |
| if (!firstTextBox() && parent()) { |
| parent()->dirtyLinesFromChangedChild(this); |
| dirtiedLines = true; |
| } |
| |
| m_linesDirty = dirtiedLines; |
| setText(text, force || dirtiedLines); |
| } |
| |
| static inline bool isInlineFlowOrEmptyText(const RenderObject* o) |
| { |
| if (o->isRenderInline()) |
| return true; |
| if (!o->isText()) |
| return false; |
| return toRenderText(o)->text().isEmpty(); |
| } |
| |
| UChar RenderText::previousCharacter() const |
| { |
| // find previous text renderer if one exists |
| const RenderObject* previousText = previousInPreOrder(); |
| for (; previousText; previousText = previousText->previousInPreOrder()) |
| if (!isInlineFlowOrEmptyText(previousText)) |
| break; |
| UChar prev = space; |
| if (previousText && previousText->isText()) |
| if (StringImpl* previousString = toRenderText(previousText)->text().impl()) |
| prev = (*previousString)[previousString->length() - 1]; |
| return prev; |
| } |
| |
| void RenderText::setTextInternal(PassRefPtr<StringImpl> text) |
| { |
| ASSERT(text); |
| m_text = text; |
| |
| ASSERT(m_text); |
| |
| m_isAllASCII = m_text.containsOnlyASCII(); |
| m_canUseSimpleFontCodePath = computeCanUseSimpleFontCodePath(); |
| } |
| |
| void RenderText::setText(PassRefPtr<StringImpl> text, bool force) |
| { |
| ASSERT(text); |
| |
| if (!force && equal(m_text.impl(), text.get())) |
| return; |
| |
| setTextInternal(text); |
| // If preferredLogicalWidthsDirty() of an orphan child is true, RenderObjectChildList:: |
| // insertChildNode() fails to set true to owner. To avoid that, we call |
| // setNeedsLayoutAndPrefWidthsRecalc() only if this RenderText has parent. |
| if (parent()) |
| setNeedsLayoutAndPrefWidthsRecalc(); |
| m_knownToHaveNoOverflowAndNoFallbackFonts = false; |
| } |
| |
| void RenderText::dirtyLineBoxes(bool fullLayout) |
| { |
| if (fullLayout) |
| deleteTextBoxes(); |
| else if (!m_linesDirty) { |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) |
| box->dirtyLineBoxes(); |
| } |
| m_linesDirty = false; |
| } |
| |
| InlineTextBox* RenderText::createTextBox() |
| { |
| return new InlineTextBox(*this); |
| } |
| |
| InlineTextBox* RenderText::createInlineTextBox() |
| { |
| InlineTextBox* textBox = createTextBox(); |
| if (!m_firstTextBox) |
| m_firstTextBox = m_lastTextBox = textBox; |
| else { |
| m_lastTextBox->setNextTextBox(textBox); |
| textBox->setPreviousTextBox(m_lastTextBox); |
| m_lastTextBox = textBox; |
| } |
| textBox->setIsText(true); |
| return textBox; |
| } |
| |
| void RenderText::positionLineBox(InlineBox* box) |
| { |
| InlineTextBox* s = toInlineTextBox(box); |
| |
| // FIXME: should not be needed!!! |
| if (!s->len()) { |
| // We want the box to be destroyed. |
| s->remove(DontMarkLineBoxes); |
| if (m_firstTextBox == s) |
| m_firstTextBox = s->nextTextBox(); |
| else |
| s->prevTextBox()->setNextTextBox(s->nextTextBox()); |
| if (m_lastTextBox == s) |
| m_lastTextBox = s->prevTextBox(); |
| else |
| s->nextTextBox()->setPreviousTextBox(s->prevTextBox()); |
| s->destroy(); |
| return; |
| } |
| |
| m_containsReversedText |= !s->isLeftToRightDirection(); |
| } |
| |
| float RenderText::width(unsigned from, unsigned len, float xPos, TextDirection textDirection, bool firstLine, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const |
| { |
| if (from >= textLength()) |
| return 0; |
| |
| if (from + len > textLength()) |
| len = textLength() - from; |
| |
| return width(from, len, style(firstLine)->font(), xPos, textDirection, fallbackFonts, glyphOverflow); |
| } |
| |
| float RenderText::width(unsigned from, unsigned len, const Font& f, float xPos, TextDirection textDirection, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const |
| { |
| ASSERT(from + len <= textLength()); |
| if (!textLength()) |
| return 0; |
| |
| float w; |
| if (&f == &style()->font()) { |
| 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); |
| // We shouldn't change our mind once we "know". |
| ASSERT(!m_knownToHaveNoOverflowAndNoFallbackFonts |
| || (fallbackFonts->isEmpty() && glyphOverflow->isZero())); |
| m_knownToHaveNoOverflowAndNoFallbackFonts = fallbackFonts->isEmpty() && glyphOverflow->isZero(); |
| } |
| w = m_maxWidth; |
| } else { |
| w = maxLogicalWidth(); |
| } |
| } else { |
| w = widthFromCache(f, from, len, xPos, textDirection, fallbackFonts, glyphOverflow); |
| } |
| } else { |
| TextRun run = constructTextRun(const_cast<RenderText*>(this), f, this, from, len, style(), textDirection); |
| 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 |
| { |
| IntRect result; |
| |
| ASSERT(!firstTextBox() == !lastTextBox()); // Either both are null or both exist. |
| if (firstTextBox() && lastTextBox()) { |
| // Return the width of the minimal left side and the maximal right side. |
| float logicalLeftSide = 0; |
| float logicalRightSide = 0; |
| for (InlineTextBox* curr = firstTextBox(); curr; curr = curr->nextTextBox()) { |
| if (curr == firstTextBox() || curr->logicalLeft() < logicalLeftSide) |
| logicalLeftSide = curr->logicalLeft(); |
| if (curr == firstTextBox() || curr->logicalRight() > logicalRightSide) |
| logicalRightSide = curr->logicalRight(); |
| } |
| |
| float x = logicalLeftSide; |
| float y = firstTextBox()->y(); |
| float width = logicalRightSide - logicalLeftSide; |
| float height = lastTextBox()->logicalBottom() - y; |
| result = enclosingIntRect(FloatRect(x, y, width, height)); |
| } |
| |
| return result; |
| } |
| |
| LayoutRect RenderText::linesVisualOverflowBoundingBox() const |
| { |
| if (!firstTextBox()) |
| return LayoutRect(); |
| |
| // Return the width of the minimal left side and the maximal right side. |
| LayoutUnit logicalLeftSide = LayoutUnit::max(); |
| LayoutUnit logicalRightSide = LayoutUnit::min(); |
| for (InlineTextBox* curr = firstTextBox(); curr; curr = curr->nextTextBox()) { |
| LayoutRect logicalVisualOverflow = curr->logicalOverflowRect(); |
| logicalLeftSide = std::min(logicalLeftSide, logicalVisualOverflow.x()); |
| logicalRightSide = std::max(logicalRightSide, logicalVisualOverflow.maxX()); |
| } |
| |
| LayoutUnit logicalTop = firstTextBox()->logicalTopVisualOverflow(); |
| LayoutUnit logicalWidth = logicalRightSide - logicalLeftSide; |
| LayoutUnit logicalHeight = lastTextBox()->logicalBottomVisualOverflow() - logicalTop; |
| |
| LayoutRect rect(logicalLeftSide, logicalTop, logicalWidth, logicalHeight); |
| return rect; |
| } |
| |
| int RenderText::caretMinOffset() const |
| { |
| InlineTextBox* box = firstTextBox(); |
| if (!box) |
| return 0; |
| int minOffset = box->start(); |
| for (box = box->nextTextBox(); box; box = box->nextTextBox()) |
| minOffset = std::min<int>(minOffset, box->start()); |
| return minOffset; |
| } |
| |
| int RenderText::caretMaxOffset() const |
| { |
| InlineTextBox* box = lastTextBox(); |
| if (!lastTextBox()) |
| return textLength(); |
| |
| int maxOffset = box->start() + box->len(); |
| for (box = box->prevTextBox(); box; box = box->prevTextBox()) |
| maxOffset = std::max<int>(maxOffset, box->start() + box->len()); |
| return maxOffset; |
| } |
| |
| unsigned RenderText::renderedTextLength() const |
| { |
| int l = 0; |
| for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) |
| l += box->len(); |
| return l; |
| } |
| |
| int RenderText::previousOffset(int current) const |
| { |
| if (isAllASCII() || m_text.is8Bit()) |
| return current - 1; |
| |
| StringImpl* textImpl = m_text.impl(); |
| TextBreakIterator* iterator = cursorMovementIterator(textImpl->characters16(), textImpl->length()); |
| if (!iterator) |
| return current - 1; |
| |
| long result = iterator->preceding(current); |
| if (result == TextBreakDone) |
| result = current - 1; |
| |
| |
| return result; |
| } |
| |
| #if OS(POSIX) |
| |
| #define HANGUL_CHOSEONG_START (0x1100) |
| #define HANGUL_CHOSEONG_END (0x115F) |
| #define HANGUL_JUNGSEONG_START (0x1160) |
| #define HANGUL_JUNGSEONG_END (0x11A2) |
| #define HANGUL_JONGSEONG_START (0x11A8) |
| #define HANGUL_JONGSEONG_END (0x11F9) |
| #define HANGUL_SYLLABLE_START (0xAC00) |
| #define HANGUL_SYLLABLE_END (0xD7AF) |
| #define HANGUL_JONGSEONG_COUNT (28) |
| |
| enum HangulState { |
| HangulStateL, |
| HangulStateV, |
| HangulStateT, |
| HangulStateLV, |
| HangulStateLVT, |
| HangulStateBreak |
| }; |
| |
| inline bool isHangulLVT(UChar32 character) |
| { |
| return (character - HANGUL_SYLLABLE_START) % HANGUL_JONGSEONG_COUNT; |
| } |
| |
| inline bool isMark(UChar32 c) |
| { |
| int8_t charType = u_charType(c); |
| return charType == U_NON_SPACING_MARK || charType == U_ENCLOSING_MARK || charType == U_COMBINING_SPACING_MARK; |
| } |
| |
| inline bool isRegionalIndicator(UChar32 c) |
| { |
| // National flag emoji each consists of a pair of regional indicator symbols. |
| return 0x1F1E6 <= c && c <= 0x1F1FF; |
| } |
| |
| #endif |
| |
| int RenderText::previousOffsetForBackwardDeletion(int current) const |
| { |
| #if OS(POSIX) |
| ASSERT(m_text); |
| StringImpl& text = *m_text.impl(); |
| UChar32 character; |
| bool sawRegionalIndicator = false; |
| while (current > 0) { |
| if (U16_IS_TRAIL(text[--current])) |
| --current; |
| if (current < 0) |
| break; |
| |
| UChar32 character = text.characterStartingAt(current); |
| |
| 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 ((character >= 0x0530) && (character < 0x1950)) |
| break; |
| |
| if (isRegionalIndicator(character)) { |
| sawRegionalIndicator = true; |
| continue; |
| } |
| |
| if (!isMark(character) && (character != 0xFF9E) && (character != 0xFF9F)) |
| break; |
| } |
| |
| if (current <= 0) |
| return current; |
| |
| // Hangul |
| character = text.characterStartingAt(current); |
| if (((character >= HANGUL_CHOSEONG_START) && (character <= HANGUL_JONGSEONG_END)) || ((character >= HANGUL_SYLLABLE_START) && (character <= HANGUL_SYLLABLE_END))) { |
| HangulState state; |
| |
| if (character < HANGUL_JUNGSEONG_START) |
| state = HangulStateL; |
| else if (character < HANGUL_JONGSEONG_START) |
| state = HangulStateV; |
| else if (character < HANGUL_SYLLABLE_START) |
| state = HangulStateT; |
| else |
| state = isHangulLVT(character) ? HangulStateLVT : HangulStateLV; |
| |
| while (current > 0 && ((character = text.characterStartingAt(current - 1)) >= HANGUL_CHOSEONG_START) && (character <= HANGUL_SYLLABLE_END) && ((character <= HANGUL_JONGSEONG_END) || (character >= HANGUL_SYLLABLE_START))) { |
| switch (state) { |
| case HangulStateV: |
| if (character <= HANGUL_CHOSEONG_END) |
| state = HangulStateL; |
| else if ((character >= HANGUL_SYLLABLE_START) && (character <= HANGUL_SYLLABLE_END) && !isHangulLVT(character)) |
| state = HangulStateLV; |
| else if (character > HANGUL_JUNGSEONG_END) |
| state = HangulStateBreak; |
| break; |
| case HangulStateT: |
| if ((character >= HANGUL_JUNGSEONG_START) && (character <= HANGUL_JUNGSEONG_END)) |
| state = HangulStateV; |
| else if ((character >= HANGUL_SYLLABLE_START) && (character <= HANGUL_SYLLABLE_END)) |
| state = (isHangulLVT(character) ? HangulStateLVT : HangulStateLV); |
| else if (character < HANGUL_JUNGSEONG_START) |
| state = HangulStateBreak; |
| break; |
| default: |
| state = (character < HANGUL_JUNGSEONG_START) ? HangulStateL : HangulStateBreak; |
| break; |
| } |
| if (state == HangulStateBreak) |
| break; |
| |
| --current; |
| } |
| } |
| |
| return current; |
| #else |
| // Platforms other than Unix-like delete by one code point. |
| if (U16_IS_TRAIL(m_text[--current])) |
| --current; |
| if (current < 0) |
| current = 0; |
| return current; |
| #endif |
| } |
| |
| int RenderText::nextOffset(int current) const |
| { |
| if (isAllASCII() || m_text.is8Bit()) |
| return current + 1; |
| |
| StringImpl* textImpl = m_text.impl(); |
| TextBreakIterator* iterator = cursorMovementIterator(textImpl->characters16(), textImpl->length()); |
| if (!iterator) |
| return current + 1; |
| |
| long result = iterator->following(current); |
| if (result == TextBreakDone) |
| result = current + 1; |
| |
| return result; |
| } |
| |
| bool RenderText::computeCanUseSimpleFontCodePath() const |
| { |
| if (isAllASCII() || m_text.is8Bit()) |
| return true; |
| return Character::characterRangeCodePath(characters16(), length()) == SimplePath; |
| } |
| |
| #if ENABLE(ASSERT) |
| |
| void RenderText::checkConsistency() const |
| { |
| #ifdef CHECK_CONSISTENCY |
| const InlineTextBox* prev = 0; |
| for (const InlineTextBox* child = m_firstTextBox; child != 0; child = child->nextTextBox()) { |
| ASSERT(child->renderer() == this); |
| ASSERT(child->prevTextBox() == prev); |
| prev = child; |
| } |
| ASSERT(prev == m_lastTextBox); |
| #endif |
| } |
| |
| #endif |
| |
| } // namespace blink |
