2 * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
3 * Copyright (C) 2006 Apple Computer Inc.
4 * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
5 * Copyright (C) 2008 Rob Buis <buis@kde.org>
6 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB. If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
26 #include "core/rendering/svg/RenderSVGInlineText.h"
28 #include "core/css/CSSFontSelector.h"
29 #include "core/css/FontSize.h"
30 #include "core/editing/VisiblePosition.h"
31 #include "core/rendering/svg/RenderSVGText.h"
32 #include "core/rendering/svg/SVGInlineTextBox.h"
33 #include "core/rendering/svg/SVGRenderingContext.h"
37 static PassRefPtr<StringImpl> applySVGWhitespaceRules(PassRefPtr<StringImpl> string, bool preserveWhiteSpace)
39 if (preserveWhiteSpace) {
40 // Spec: When xml:space="preserve", the SVG user agent will do the following using a
41 // copy of the original character data content. It will convert all newline and tab
42 // characters into space characters. Then, it will draw all space characters, including
43 // leading, trailing and multiple contiguous space characters.
44 RefPtr<StringImpl> newString = string->replace('\t', ' ');
45 newString = newString->replace('\n', ' ');
46 newString = newString->replace('\r', ' ');
47 return newString.release();
50 // Spec: When xml:space="default", the SVG user agent will do the following using a
51 // copy of the original character data content. First, it will remove all newline
52 // characters. Then it will convert all tab characters into space characters.
53 // Then, it will strip off all leading and trailing space characters.
54 // Then, all contiguous space characters will be consolidated.
55 RefPtr<StringImpl> newString = string->replace('\n', StringImpl::empty());
56 newString = newString->replace('\r', StringImpl::empty());
57 newString = newString->replace('\t', ' ');
58 return newString.release();
61 RenderSVGInlineText::RenderSVGInlineText(Node* n, PassRefPtr<StringImpl> string)
62 : RenderText(n, applySVGWhitespaceRules(string, false))
64 , m_layoutAttributes(this)
68 void RenderSVGInlineText::setTextInternal(PassRefPtr<StringImpl> text)
70 RenderText::setTextInternal(text);
71 if (RenderSVGText* textRenderer = RenderSVGText::locateRenderSVGTextAncestor(this))
72 textRenderer->subtreeTextDidChange(this);
75 void RenderSVGInlineText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
77 RenderText::styleDidChange(diff, oldStyle);
80 bool newPreserves = style() ? style()->whiteSpace() == PRE : false;
81 bool oldPreserves = oldStyle ? oldStyle->whiteSpace() == PRE : false;
82 if (oldPreserves && !newPreserves) {
83 setText(applySVGWhitespaceRules(originalText(), false), true);
87 if (!oldPreserves && newPreserves) {
88 setText(applySVGWhitespaceRules(originalText(), true), true);
92 if (!diff.needsFullLayout())
95 // The text metrics may be influenced by style changes.
96 if (RenderSVGText* textRenderer = RenderSVGText::locateRenderSVGTextAncestor(this))
97 textRenderer->setNeedsLayout();
100 InlineTextBox* RenderSVGInlineText::createTextBox()
102 InlineTextBox* box = new SVGInlineTextBox(*this);
103 box->setHasVirtualLogicalHeight();
107 LayoutRect RenderSVGInlineText::localCaretRect(InlineBox* box, int caretOffset, LayoutUnit*)
109 if (!box || !box->isInlineTextBox())
112 InlineTextBox* textBox = toInlineTextBox(box);
113 if (static_cast<unsigned>(caretOffset) < textBox->start() || static_cast<unsigned>(caretOffset) > textBox->start() + textBox->len())
116 // Use the edge of the selection rect to determine the caret rect.
117 if (static_cast<unsigned>(caretOffset) < textBox->start() + textBox->len()) {
118 LayoutRect rect = textBox->localSelectionRect(caretOffset, caretOffset + 1);
119 LayoutUnit x = box->isLeftToRightDirection() ? rect.x() : rect.maxX();
120 return LayoutRect(x, rect.y(), caretWidth, rect.height());
123 LayoutRect rect = textBox->localSelectionRect(caretOffset - 1, caretOffset);
124 LayoutUnit x = box->isLeftToRightDirection() ? rect.maxX() : rect.x();
125 return LayoutRect(x, rect.y(), caretWidth, rect.height());
128 FloatRect RenderSVGInlineText::floatLinesBoundingBox() const
130 FloatRect boundingBox;
131 for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox())
132 boundingBox.unite(box->calculateBoundaries());
136 IntRect RenderSVGInlineText::linesBoundingBox() const
138 return enclosingIntRect(floatLinesBoundingBox());
141 bool RenderSVGInlineText::characterStartsNewTextChunk(int position) const
143 ASSERT(position >= 0);
144 ASSERT(position < static_cast<int>(textLength()));
146 // Each <textPath> element starts a new text chunk, regardless of any x/y values.
147 if (!position && parent()->isSVGTextPath() && !previousSibling())
150 const SVGCharacterDataMap::const_iterator it = m_layoutAttributes.characterDataMap().find(static_cast<unsigned>(position + 1));
151 if (it == m_layoutAttributes.characterDataMap().end())
154 return it->value.x != SVGTextLayoutAttributes::emptyValue() || it->value.y != SVGTextLayoutAttributes::emptyValue();
157 PositionWithAffinity RenderSVGInlineText::positionForPoint(const LayoutPoint& point)
159 if (!firstTextBox() || !textLength())
160 return createPositionWithAffinity(0, DOWNSTREAM);
162 float baseline = m_scaledFont.fontMetrics().floatAscent();
164 RenderBlock* containingBlock = this->containingBlock();
165 ASSERT(containingBlock);
167 // Map local point to absolute point, as the character origins stored in the text fragments use absolute coordinates.
168 FloatPoint absolutePoint(point);
169 absolutePoint.moveBy(containingBlock->location());
171 float closestDistance = std::numeric_limits<float>::max();
172 float closestDistancePosition = 0;
173 const SVGTextFragment* closestDistanceFragment = 0;
174 SVGInlineTextBox* closestDistanceBox = 0;
176 AffineTransform fragmentTransform;
177 for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
178 if (!box->isSVGInlineTextBox())
181 SVGInlineTextBox* textBox = toSVGInlineTextBox(box);
182 Vector<SVGTextFragment>& fragments = textBox->textFragments();
184 unsigned textFragmentsSize = fragments.size();
185 for (unsigned i = 0; i < textFragmentsSize; ++i) {
186 const SVGTextFragment& fragment = fragments.at(i);
187 FloatRect fragmentRect(fragment.x, fragment.y - baseline, fragment.width, fragment.height);
188 fragment.buildFragmentTransform(fragmentTransform);
189 fragmentRect = fragmentTransform.mapRect(fragmentRect);
191 float distance = powf(fragmentRect.x() - absolutePoint.x(), 2) +
192 powf(fragmentRect.y() + fragmentRect.height() / 2 - absolutePoint.y(), 2);
194 if (distance < closestDistance) {
195 closestDistance = distance;
196 closestDistanceBox = textBox;
197 closestDistanceFragment = &fragment;
198 closestDistancePosition = fragmentRect.x();
203 if (!closestDistanceFragment)
204 return createPositionWithAffinity(0, DOWNSTREAM);
206 int offset = closestDistanceBox->offsetForPositionInFragment(*closestDistanceFragment, absolutePoint.x() - closestDistancePosition, true);
207 return createPositionWithAffinity(offset + closestDistanceBox->start(), offset > 0 ? VP_UPSTREAM_IF_POSSIBLE : DOWNSTREAM);
210 void RenderSVGInlineText::updateScaledFont()
212 computeNewScaledFontForStyle(this, style(), m_scalingFactor, m_scaledFont);
215 void RenderSVGInlineText::computeNewScaledFontForStyle(RenderObject* renderer, const RenderStyle* style, float& scalingFactor, Font& scaledFont)
220 // Alter font-size to the right on-screen value to avoid scaling the glyphs themselves, except when GeometricPrecision is specified.
221 scalingFactor = SVGRenderingContext::calculateScreenFontSizeScalingFactor(renderer);
222 if (scalingFactor == 1 || !scalingFactor) {
224 scaledFont = style->font();
228 if (style->fontDescription().textRendering() == GeometricPrecision)
231 FontDescription fontDescription(style->fontDescription());
233 Document& document = renderer->document();
234 // FIXME: We need to better handle the case when we compute very small fonts below (below 1pt).
235 fontDescription.setComputedSize(FontSize::getComputedSizeFromSpecifiedSize(&document, scalingFactor, fontDescription.isAbsoluteSize(), fontDescription.specifiedSize(), DoNotUseSmartMinimumForFontSize));
237 scaledFont = Font(fontDescription);
238 scaledFont.update(document.styleEngine()->fontSelector());