| /* |
| * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved. |
| * |
| * 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 "core/rendering/svg/SVGTextLayoutEngine.h" |
| |
| #include "core/rendering/svg/RenderSVGInlineText.h" |
| #include "core/rendering/svg/RenderSVGTextPath.h" |
| #include "core/rendering/svg/SVGInlineTextBox.h" |
| #include "core/rendering/svg/SVGTextLayoutEngineBaseline.h" |
| #include "core/rendering/svg/SVGTextLayoutEngineSpacing.h" |
| #include "core/svg/SVGElement.h" |
| #include "core/svg/SVGLengthContext.h" |
| |
| // Set to a value > 0 to dump the text fragments |
| #define DUMP_TEXT_FRAGMENTS 0 |
| |
| namespace WebCore { |
| |
| SVGTextLayoutEngine::SVGTextLayoutEngine(Vector<SVGTextLayoutAttributes*>& layoutAttributes) |
| : m_layoutAttributes(layoutAttributes) |
| , m_layoutAttributesPosition(0) |
| , m_logicalCharacterOffset(0) |
| , m_logicalMetricsListOffset(0) |
| , m_visualCharacterOffset(0) |
| , m_visualMetricsListOffset(0) |
| , m_x(0) |
| , m_y(0) |
| , m_dx(0) |
| , m_dy(0) |
| , m_isVerticalText(false) |
| , m_inPathLayout(false) |
| , m_textPathCalculator(0) |
| , m_textPathLength(0) |
| , m_textPathCurrentOffset(0) |
| , m_textPathSpacing(0) |
| , m_textPathScaling(1) |
| { |
| ASSERT(!m_layoutAttributes.isEmpty()); |
| } |
| |
| void SVGTextLayoutEngine::updateCharacerPositionIfNeeded(float& x, float& y) |
| { |
| if (m_inPathLayout) |
| return; |
| |
| // Replace characters x/y position, with the current text position plus any |
| // relative adjustments, if it doesn't specify an absolute position itself. |
| if (x == SVGTextLayoutAttributes::emptyValue()) |
| x = m_x + m_dx; |
| |
| if (y == SVGTextLayoutAttributes::emptyValue()) |
| y = m_y + m_dy; |
| |
| m_dx = 0; |
| m_dy = 0; |
| } |
| |
| void SVGTextLayoutEngine::updateCurrentTextPosition(float x, float y, float glyphAdvance) |
| { |
| // Update current text position after processing the character. |
| if (m_isVerticalText) { |
| m_x = x; |
| m_y = y + glyphAdvance; |
| } else { |
| m_x = x + glyphAdvance; |
| m_y = y; |
| } |
| } |
| |
| void SVGTextLayoutEngine::updateRelativePositionAdjustmentsIfNeeded(float dx, float dy) |
| { |
| // Update relative positioning information. |
| if (dx == SVGTextLayoutAttributes::emptyValue() && dy == SVGTextLayoutAttributes::emptyValue()) |
| return; |
| |
| if (dx == SVGTextLayoutAttributes::emptyValue()) |
| dx = 0; |
| if (dy == SVGTextLayoutAttributes::emptyValue()) |
| dy = 0; |
| |
| if (m_inPathLayout) { |
| if (m_isVerticalText) { |
| m_dx += dx; |
| m_dy = dy; |
| } else { |
| m_dx = dx; |
| m_dy += dy; |
| } |
| |
| return; |
| } |
| |
| m_dx = dx; |
| m_dy = dy; |
| } |
| |
| void SVGTextLayoutEngine::recordTextFragment(SVGInlineTextBox* textBox, Vector<SVGTextMetrics>& textMetricsValues) |
| { |
| ASSERT(!m_currentTextFragment.length); |
| ASSERT(m_visualMetricsListOffset > 0); |
| |
| // Figure out length of fragment. |
| m_currentTextFragment.length = m_visualCharacterOffset - m_currentTextFragment.characterOffset; |
| |
| // Figure out fragment metrics. |
| SVGTextMetrics& lastCharacterMetrics = textMetricsValues.at(m_visualMetricsListOffset - 1); |
| m_currentTextFragment.width = lastCharacterMetrics.width(); |
| m_currentTextFragment.height = lastCharacterMetrics.height(); |
| |
| if (m_currentTextFragment.length > 1) { |
| // SVGTextLayoutAttributesBuilder assures that the length of the range is equal to the sum of the individual lengths of the glyphs. |
| float length = 0; |
| if (m_isVerticalText) { |
| for (unsigned i = m_currentTextFragment.metricsListOffset; i < m_visualMetricsListOffset; ++i) |
| length += textMetricsValues.at(i).height(); |
| m_currentTextFragment.height = length; |
| } else { |
| for (unsigned i = m_currentTextFragment.metricsListOffset; i < m_visualMetricsListOffset; ++i) |
| length += textMetricsValues.at(i).width(); |
| m_currentTextFragment.width = length; |
| } |
| } |
| |
| textBox->textFragments().append(m_currentTextFragment); |
| m_currentTextFragment = SVGTextFragment(); |
| } |
| |
| bool SVGTextLayoutEngine::parentDefinesTextLength(RenderObject* parent) const |
| { |
| RenderObject* currentParent = parent; |
| while (currentParent) { |
| if (SVGTextContentElement* textContentElement = SVGTextContentElement::elementFromRenderer(currentParent)) { |
| SVGLengthContext lengthContext(textContentElement); |
| if (textContentElement->lengthAdjustCurrentValue() == SVGLengthAdjustSpacing && textContentElement->textLengthIsSpecifiedByUser()) |
| return true; |
| } |
| |
| if (currentParent->isSVGText()) |
| return false; |
| |
| currentParent = currentParent->parent(); |
| } |
| |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| void SVGTextLayoutEngine::beginTextPathLayout(RenderObject* object, SVGTextLayoutEngine& lineLayout) |
| { |
| ASSERT(object); |
| |
| m_inPathLayout = true; |
| RenderSVGTextPath* textPath = toRenderSVGTextPath(object); |
| |
| Path path = textPath->layoutPath(); |
| if (path.isEmpty()) |
| return; |
| m_textPathCalculator = new Path::PositionCalculator(path); |
| m_textPathStartOffset = textPath->startOffset(); |
| m_textPathLength = path.length(); |
| if (m_textPathStartOffset > 0 && m_textPathStartOffset <= 1) |
| m_textPathStartOffset *= m_textPathLength; |
| |
| float totalLength = 0; |
| unsigned totalCharacters = 0; |
| |
| lineLayout.m_chunkLayoutBuilder.buildTextChunks(lineLayout.m_lineLayoutBoxes); |
| const Vector<SVGTextChunk>& textChunks = lineLayout.m_chunkLayoutBuilder.textChunks(); |
| |
| unsigned size = textChunks.size(); |
| for (unsigned i = 0; i < size; ++i) { |
| const SVGTextChunk& chunk = textChunks.at(i); |
| |
| float length = 0; |
| unsigned characters = 0; |
| chunk.calculateLength(length, characters); |
| |
| // Handle text-anchor as additional start offset for text paths. |
| m_textPathStartOffset += chunk.calculateTextAnchorShift(length); |
| |
| totalLength += length; |
| totalCharacters += characters; |
| } |
| |
| m_textPathCurrentOffset = m_textPathStartOffset; |
| |
| // Eventually handle textLength adjustments. |
| SVGLengthAdjustType lengthAdjust = SVGLengthAdjustUnknown; |
| float desiredTextLength = 0; |
| |
| if (SVGTextContentElement* textContentElement = SVGTextContentElement::elementFromRenderer(textPath)) { |
| SVGLengthContext lengthContext(textContentElement); |
| lengthAdjust = textContentElement->lengthAdjustCurrentValue(); |
| if (textContentElement->textLengthIsSpecifiedByUser()) |
| desiredTextLength = textContentElement->textLength()->currentValue()->value(lengthContext); |
| else |
| desiredTextLength = 0; |
| } |
| |
| if (!desiredTextLength) |
| return; |
| |
| if (lengthAdjust == SVGLengthAdjustSpacing) |
| m_textPathSpacing = (desiredTextLength - totalLength) / totalCharacters; |
| else |
| m_textPathScaling = desiredTextLength / totalLength; |
| } |
| |
| void SVGTextLayoutEngine::endTextPathLayout() |
| { |
| m_inPathLayout = false; |
| delete m_textPathCalculator; |
| m_textPathCalculator = 0; |
| m_textPathLength = 0; |
| m_textPathStartOffset = 0; |
| m_textPathCurrentOffset = 0; |
| m_textPathSpacing = 0; |
| m_textPathScaling = 1; |
| } |
| |
| void SVGTextLayoutEngine::layoutInlineTextBox(SVGInlineTextBox* textBox) |
| { |
| ASSERT(textBox); |
| |
| RenderSVGInlineText* text = toRenderSVGInlineText(textBox->textRenderer()); |
| ASSERT(text); |
| ASSERT(text->parent()); |
| ASSERT(text->parent()->node()); |
| ASSERT(text->parent()->node()->isSVGElement()); |
| |
| const RenderStyle* style = text->style(); |
| ASSERT(style); |
| |
| textBox->clearTextFragments(); |
| m_isVerticalText = style->svgStyle()->isVerticalWritingMode(); |
| layoutTextOnLineOrPath(textBox, text, style); |
| |
| if (m_inPathLayout) { |
| m_pathLayoutBoxes.append(textBox); |
| return; |
| } |
| |
| m_lineLayoutBoxes.append(textBox); |
| } |
| |
| #if DUMP_TEXT_FRAGMENTS > 0 |
| static inline void dumpTextBoxes(Vector<SVGInlineTextBox*>& boxes) |
| { |
| unsigned boxCount = boxes.size(); |
| fprintf(stderr, "Dumping all text fragments in text sub tree, %i boxes\n", boxCount); |
| |
| for (unsigned boxPosition = 0; boxPosition < boxCount; ++boxPosition) { |
| SVGInlineTextBox* textBox = boxes.at(boxPosition); |
| Vector<SVGTextFragment>& fragments = textBox->textFragments(); |
| fprintf(stderr, "-> Box %i: Dumping text fragments for SVGInlineTextBox, textBox=%p, textRenderer=%p\n", boxPosition, textBox, textBox->textRenderer()); |
| fprintf(stderr, " textBox properties, start=%i, len=%i, box direction=%i\n", textBox->start(), textBox->len(), textBox->direction()); |
| fprintf(stderr, " textRenderer properties, textLength=%i\n", textBox->textRenderer()->textLength()); |
| |
| String characters = textBox->textRenderer()->text(); |
| |
| unsigned fragmentCount = fragments.size(); |
| for (unsigned i = 0; i < fragmentCount; ++i) { |
| SVGTextFragment& fragment = fragments.at(i); |
| String fragmentString = characters.substring(fragment.characterOffset, fragment.length); |
| fprintf(stderr, " -> Fragment %i, x=%lf, y=%lf, width=%lf, height=%lf, characterOffset=%i, length=%i, characters='%s'\n" |
| , i, fragment.x, fragment.y, fragment.width, fragment.height, fragment.characterOffset, fragment.length, fragmentString.utf8().data()); |
| } |
| } |
| } |
| #endif |
| |
| void SVGTextLayoutEngine::finalizeTransformMatrices(Vector<SVGInlineTextBox*>& boxes) |
| { |
| unsigned boxCount = boxes.size(); |
| if (!boxCount) |
| return; |
| |
| AffineTransform textBoxTransformation; |
| for (unsigned boxPosition = 0; boxPosition < boxCount; ++boxPosition) { |
| SVGInlineTextBox* textBox = boxes.at(boxPosition); |
| Vector<SVGTextFragment>& fragments = textBox->textFragments(); |
| |
| unsigned fragmentCount = fragments.size(); |
| for (unsigned i = 0; i < fragmentCount; ++i) { |
| m_chunkLayoutBuilder.transformationForTextBox(textBox, textBoxTransformation); |
| if (textBoxTransformation.isIdentity()) |
| continue; |
| ASSERT(fragments[i].lengthAdjustTransform.isIdentity()); |
| fragments[i].lengthAdjustTransform = textBoxTransformation; |
| } |
| } |
| |
| boxes.clear(); |
| } |
| |
| void SVGTextLayoutEngine::finishLayout() |
| { |
| // After all text fragments are stored in their correpsonding SVGInlineTextBoxes, we can layout individual text chunks. |
| // Chunk layouting is only performed for line layout boxes, not for path layout, where it has already been done. |
| m_chunkLayoutBuilder.layoutTextChunks(m_lineLayoutBoxes); |
| |
| // Finalize transform matrices, after the chunk layout corrections have been applied, and all fragment x/y positions are finalized. |
| if (!m_lineLayoutBoxes.isEmpty()) { |
| #if DUMP_TEXT_FRAGMENTS > 0 |
| fprintf(stderr, "Line layout: "); |
| dumpTextBoxes(m_lineLayoutBoxes); |
| #endif |
| |
| finalizeTransformMatrices(m_lineLayoutBoxes); |
| } |
| |
| if (!m_pathLayoutBoxes.isEmpty()) { |
| #if DUMP_TEXT_FRAGMENTS > 0 |
| fprintf(stderr, "Path layout: "); |
| dumpTextBoxes(m_pathLayoutBoxes); |
| #endif |
| |
| finalizeTransformMatrices(m_pathLayoutBoxes); |
| } |
| } |
| |
| bool SVGTextLayoutEngine::currentLogicalCharacterAttributes(SVGTextLayoutAttributes*& logicalAttributes) |
| { |
| if (m_layoutAttributesPosition == m_layoutAttributes.size()) |
| return false; |
| |
| logicalAttributes = m_layoutAttributes[m_layoutAttributesPosition]; |
| ASSERT(logicalAttributes); |
| |
| if (m_logicalCharacterOffset != logicalAttributes->context()->textLength()) |
| return true; |
| |
| ++m_layoutAttributesPosition; |
| if (m_layoutAttributesPosition == m_layoutAttributes.size()) |
| return false; |
| |
| logicalAttributes = m_layoutAttributes[m_layoutAttributesPosition]; |
| m_logicalMetricsListOffset = 0; |
| m_logicalCharacterOffset = 0; |
| return true; |
| } |
| |
| bool SVGTextLayoutEngine::currentLogicalCharacterMetrics(SVGTextLayoutAttributes*& logicalAttributes, SVGTextMetrics& logicalMetrics) |
| { |
| Vector<SVGTextMetrics>* textMetricsValues = &logicalAttributes->textMetricsValues(); |
| unsigned textMetricsSize = textMetricsValues->size(); |
| while (true) { |
| if (m_logicalMetricsListOffset == textMetricsSize) { |
| if (!currentLogicalCharacterAttributes(logicalAttributes)) |
| return false; |
| |
| textMetricsValues = &logicalAttributes->textMetricsValues(); |
| textMetricsSize = textMetricsValues->size(); |
| continue; |
| } |
| |
| ASSERT(textMetricsSize); |
| ASSERT(m_logicalMetricsListOffset < textMetricsSize); |
| logicalMetrics = textMetricsValues->at(m_logicalMetricsListOffset); |
| if (logicalMetrics.isEmpty() || (!logicalMetrics.width() && !logicalMetrics.height())) { |
| advanceToNextLogicalCharacter(logicalMetrics); |
| continue; |
| } |
| |
| // Stop if we found the next valid logical text metrics object. |
| return true; |
| } |
| |
| ASSERT_NOT_REACHED(); |
| return true; |
| } |
| |
| bool SVGTextLayoutEngine::currentVisualCharacterMetrics(SVGInlineTextBox* textBox, Vector<SVGTextMetrics>& visualMetricsValues, SVGTextMetrics& visualMetrics) |
| { |
| ASSERT(!visualMetricsValues.isEmpty()); |
| unsigned textMetricsSize = visualMetricsValues.size(); |
| unsigned boxStart = textBox->start(); |
| unsigned boxLength = textBox->len(); |
| |
| while (m_visualMetricsListOffset < textMetricsSize) { |
| // Advance to text box start location. |
| if (m_visualCharacterOffset < boxStart) { |
| advanceToNextVisualCharacter(visualMetricsValues[m_visualMetricsListOffset]); |
| continue; |
| } |
| |
| // Stop if we've finished processing this text box. |
| if (m_visualCharacterOffset >= boxStart + boxLength) |
| return false; |
| |
| visualMetrics = visualMetricsValues[m_visualMetricsListOffset]; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void SVGTextLayoutEngine::advanceToNextLogicalCharacter(const SVGTextMetrics& logicalMetrics) |
| { |
| ++m_logicalMetricsListOffset; |
| m_logicalCharacterOffset += logicalMetrics.length(); |
| } |
| |
| void SVGTextLayoutEngine::advanceToNextVisualCharacter(const SVGTextMetrics& visualMetrics) |
| { |
| ++m_visualMetricsListOffset; |
| m_visualCharacterOffset += visualMetrics.length(); |
| } |
| |
| void SVGTextLayoutEngine::layoutTextOnLineOrPath(SVGInlineTextBox* textBox, RenderSVGInlineText* text, const RenderStyle* style) |
| { |
| if (m_inPathLayout && !m_textPathCalculator) |
| return; |
| |
| SVGElement* lengthContext = toSVGElement(text->parent()->node()); |
| |
| RenderObject* textParent = text->parent(); |
| bool definesTextLength = textParent ? parentDefinesTextLength(textParent) : false; |
| |
| const SVGRenderStyle* svgStyle = style->svgStyle(); |
| ASSERT(svgStyle); |
| |
| m_visualMetricsListOffset = 0; |
| m_visualCharacterOffset = 0; |
| |
| Vector<SVGTextMetrics>& visualMetricsValues = text->layoutAttributes()->textMetricsValues(); |
| ASSERT(!visualMetricsValues.isEmpty()); |
| |
| const Font& font = style->font(); |
| |
| SVGTextLayoutEngineSpacing spacingLayout(font); |
| SVGTextLayoutEngineBaseline baselineLayout(font); |
| |
| bool didStartTextFragment = false; |
| bool applySpacingToNextCharacter = false; |
| |
| float lastAngle = 0; |
| float baselineShift = baselineLayout.calculateBaselineShift(svgStyle, lengthContext); |
| baselineShift -= baselineLayout.calculateAlignmentBaselineShift(m_isVerticalText, text); |
| |
| // Main layout algorithm. |
| while (true) { |
| // Find the start of the current text box in this list, respecting ligatures. |
| SVGTextMetrics visualMetrics(SVGTextMetrics::SkippedSpaceMetrics); |
| if (!currentVisualCharacterMetrics(textBox, visualMetricsValues, visualMetrics)) |
| break; |
| |
| if (visualMetrics.isEmpty()) { |
| advanceToNextVisualCharacter(visualMetrics); |
| continue; |
| } |
| |
| SVGTextLayoutAttributes* logicalAttributes = 0; |
| if (!currentLogicalCharacterAttributes(logicalAttributes)) |
| break; |
| |
| ASSERT(logicalAttributes); |
| SVGTextMetrics logicalMetrics(SVGTextMetrics::SkippedSpaceMetrics); |
| if (!currentLogicalCharacterMetrics(logicalAttributes, logicalMetrics)) |
| break; |
| |
| SVGCharacterDataMap& characterDataMap = logicalAttributes->characterDataMap(); |
| SVGCharacterData data; |
| SVGCharacterDataMap::iterator it = characterDataMap.find(m_logicalCharacterOffset + 1); |
| if (it != characterDataMap.end()) |
| data = it->value; |
| |
| float x = data.x; |
| float y = data.y; |
| |
| // When we've advanced to the box start offset, determine using the original x/y values, |
| // whether this character starts a new text chunk, before doing any further processing. |
| if (m_visualCharacterOffset == textBox->start()) |
| textBox->setStartsNewTextChunk(logicalAttributes->context()->characterStartsNewTextChunk(m_logicalCharacterOffset)); |
| |
| float angle = data.rotate == SVGTextLayoutAttributes::emptyValue() ? 0 : data.rotate; |
| |
| // Calculate glyph orientation angle. |
| UChar currentCharacter = text->characterAt(m_visualCharacterOffset); |
| float orientationAngle = baselineLayout.calculateGlyphOrientationAngle(m_isVerticalText, svgStyle, currentCharacter); |
| |
| // Calculate glyph advance & x/y orientation shifts. |
| float xOrientationShift = 0; |
| float yOrientationShift = 0; |
| float glyphAdvance = baselineLayout.calculateGlyphAdvanceAndOrientation(m_isVerticalText, visualMetrics, orientationAngle, xOrientationShift, yOrientationShift); |
| |
| // Assign current text position to x/y values, if needed. |
| updateCharacerPositionIfNeeded(x, y); |
| |
| // Apply dx/dy value adjustments to current text position, if needed. |
| updateRelativePositionAdjustmentsIfNeeded(data.dx, data.dy); |
| |
| // Calculate SVG Fonts kerning, if needed. |
| float kerning = spacingLayout.calculateSVGKerning(m_isVerticalText, visualMetrics.glyph()); |
| |
| // Calculate CSS 'kerning', 'letter-spacing' and 'word-spacing' for next character, if needed. |
| float spacing = spacingLayout.calculateCSSKerningAndSpacing(svgStyle, lengthContext, currentCharacter); |
| |
| float textPathOffset = 0; |
| if (m_inPathLayout) { |
| float scaledGlyphAdvance = glyphAdvance * m_textPathScaling; |
| if (m_isVerticalText) { |
| // If there's an absolute y position available, it marks the beginning of a new position along the path. |
| if (y != SVGTextLayoutAttributes::emptyValue()) |
| m_textPathCurrentOffset = y + m_textPathStartOffset; |
| |
| m_textPathCurrentOffset += m_dy - kerning; |
| m_dy = 0; |
| |
| // Apply dx/dy correction and setup translations that move to the glyph midpoint. |
| xOrientationShift += m_dx + baselineShift; |
| yOrientationShift -= scaledGlyphAdvance / 2; |
| } else { |
| // If there's an absolute x position available, it marks the beginning of a new position along the path. |
| if (x != SVGTextLayoutAttributes::emptyValue()) |
| m_textPathCurrentOffset = x + m_textPathStartOffset; |
| |
| m_textPathCurrentOffset += m_dx - kerning; |
| m_dx = 0; |
| |
| // Apply dx/dy correction and setup translations that move to the glyph midpoint. |
| xOrientationShift -= scaledGlyphAdvance / 2; |
| yOrientationShift += m_dy - baselineShift; |
| } |
| |
| // Calculate current offset along path. |
| textPathOffset = m_textPathCurrentOffset + scaledGlyphAdvance / 2; |
| |
| // Move to next character. |
| m_textPathCurrentOffset += scaledGlyphAdvance + m_textPathSpacing + spacing * m_textPathScaling; |
| |
| // Skip character, if we're before the path. |
| if (textPathOffset < 0) { |
| advanceToNextLogicalCharacter(logicalMetrics); |
| advanceToNextVisualCharacter(visualMetrics); |
| continue; |
| } |
| |
| // Stop processing, if the next character lies behind the path. |
| if (textPathOffset > m_textPathLength) |
| break; |
| |
| FloatPoint point; |
| bool ok = m_textPathCalculator->pointAndNormalAtLength(textPathOffset, point, angle); |
| ASSERT_UNUSED(ok, ok); |
| x = point.x(); |
| y = point.y(); |
| |
| // For vertical text on path, the actual angle has to be rotated 90 degrees anti-clockwise, not the orientation angle! |
| if (m_isVerticalText) |
| angle -= 90; |
| } else { |
| // Apply all previously calculated shift values. |
| if (m_isVerticalText) { |
| x += baselineShift; |
| y -= kerning; |
| } else { |
| x -= kerning; |
| y -= baselineShift; |
| } |
| |
| x += m_dx; |
| y += m_dy; |
| } |
| |
| // Determine whether we have to start a new fragment. |
| bool shouldStartNewFragment = m_dx || m_dy || m_isVerticalText || m_inPathLayout || angle || angle != lastAngle |
| || orientationAngle || kerning || applySpacingToNextCharacter || definesTextLength; |
| |
| // If we already started a fragment, close it now. |
| if (didStartTextFragment && shouldStartNewFragment) { |
| applySpacingToNextCharacter = false; |
| recordTextFragment(textBox, visualMetricsValues); |
| } |
| |
| // Eventually start a new fragment, if not yet done. |
| if (!didStartTextFragment || shouldStartNewFragment) { |
| ASSERT(!m_currentTextFragment.characterOffset); |
| ASSERT(!m_currentTextFragment.length); |
| |
| didStartTextFragment = true; |
| m_currentTextFragment.characterOffset = m_visualCharacterOffset; |
| m_currentTextFragment.metricsListOffset = m_visualMetricsListOffset; |
| m_currentTextFragment.x = x; |
| m_currentTextFragment.y = y; |
| |
| // Build fragment transformation. |
| if (angle) |
| m_currentTextFragment.transform.rotate(angle); |
| |
| if (xOrientationShift || yOrientationShift) |
| m_currentTextFragment.transform.translate(xOrientationShift, yOrientationShift); |
| |
| if (orientationAngle) |
| m_currentTextFragment.transform.rotate(orientationAngle); |
| |
| m_currentTextFragment.isTextOnPath = m_inPathLayout && m_textPathScaling != 1; |
| if (m_currentTextFragment.isTextOnPath) { |
| if (m_isVerticalText) |
| m_currentTextFragment.lengthAdjustTransform.scaleNonUniform(1, m_textPathScaling); |
| else |
| m_currentTextFragment.lengthAdjustTransform.scaleNonUniform(m_textPathScaling, 1); |
| } |
| } |
| |
| // Update current text position, after processing of the current character finished. |
| if (m_inPathLayout) |
| updateCurrentTextPosition(x, y, glyphAdvance); |
| else { |
| // Apply CSS 'kerning', 'letter-spacing' and 'word-spacing' to next character, if needed. |
| if (spacing) |
| applySpacingToNextCharacter = true; |
| |
| float xNew = x - m_dx; |
| float yNew = y - m_dy; |
| |
| if (m_isVerticalText) |
| xNew -= baselineShift; |
| else |
| yNew += baselineShift; |
| |
| updateCurrentTextPosition(xNew, yNew, glyphAdvance + spacing); |
| } |
| |
| advanceToNextLogicalCharacter(logicalMetrics); |
| advanceToNextVisualCharacter(visualMetrics); |
| lastAngle = angle; |
| } |
| |
| if (!didStartTextFragment) |
| return; |
| |
| // Close last open fragment, if needed. |
| recordTextFragment(textBox, visualMetricsValues); |
| } |
| |
| } |
