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/dom/StyleEngine.h"
31 #include "core/editing/VisiblePosition.h"
32 #include "core/rendering/svg/RenderSVGText.h"
33 #include "core/rendering/svg/SVGInlineTextBox.h"
34 #include "core/rendering/svg/SVGRenderingContext.h"
38 static PassRefPtr<StringImpl> applySVGWhitespaceRules(PassRefPtr<StringImpl> string, bool preserveWhiteSpace)
40 if (preserveWhiteSpace) {
41 // Spec: When xml:space="preserve", the SVG user agent will do the following using a
42 // copy of the original character data content. It will convert all newline and tab
43 // characters into space characters. Then, it will draw all space characters, including
44 // leading, trailing and multiple contiguous space characters.
45 RefPtr<StringImpl> newString = string->replace('\t', ' ');
46 newString = newString->replace('\n', ' ');
47 newString = newString->replace('\r', ' ');
48 return newString.release();
51 // Spec: When xml:space="default", the SVG user agent will do the following using a
52 // copy of the original character data content. First, it will remove all newline
53 // characters. Then it will convert all tab characters into space characters.
54 // Then, it will strip off all leading and trailing space characters.
55 // Then, all contiguous space characters will be consolidated.
56 RefPtr<StringImpl> newString = string->replace('\n', StringImpl::empty());
57 newString = newString->replace('\r', StringImpl::empty());
58 newString = newString->replace('\t', ' ');
59 return newString.release();
62 RenderSVGInlineText::RenderSVGInlineText(Node* n, PassRefPtr<StringImpl> string)
63 : RenderText(n, applySVGWhitespaceRules(string, false))
65 , m_layoutAttributes(this)
69 void RenderSVGInlineText::setTextInternal(PassRefPtr<StringImpl> text)
71 RenderText::setTextInternal(text);
72 if (RenderSVGText* textRenderer = RenderSVGText::locateRenderSVGTextAncestor(this))
73 textRenderer->subtreeTextDidChange(this);
76 void RenderSVGInlineText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
78 RenderText::styleDidChange(diff, oldStyle);
81 bool newPreserves = style() ? style()->whiteSpace() == PRE : false;
82 bool oldPreserves = oldStyle ? oldStyle->whiteSpace() == PRE : false;
83 if (oldPreserves != newPreserves) {
84 setText(originalText(), true);
88 if (!diff.needsFullLayout())
91 // The text metrics may be influenced by style changes.
92 if (RenderSVGText* textRenderer = RenderSVGText::locateRenderSVGTextAncestor(this))
93 textRenderer->setNeedsLayoutAndFullPaintInvalidation();
96 InlineTextBox* RenderSVGInlineText::createTextBox(int start, unsigned short length)
98 InlineTextBox* box = new SVGInlineTextBox(*this, start, length);
99 box->setHasVirtualLogicalHeight();
103 LayoutRect RenderSVGInlineText::localCaretRect(InlineBox* box, int caretOffset, LayoutUnit*)
105 if (!box || !box->isInlineTextBox())
108 InlineTextBox* textBox = toInlineTextBox(box);
109 if (static_cast<unsigned>(caretOffset) < textBox->start() || static_cast<unsigned>(caretOffset) > textBox->start() + textBox->len())
112 // Use the edge of the selection rect to determine the caret rect.
113 if (static_cast<unsigned>(caretOffset) < textBox->start() + textBox->len()) {
114 LayoutRect rect = textBox->localSelectionRect(caretOffset, caretOffset + 1);
115 LayoutUnit x = box->isLeftToRightDirection() ? rect.x() : rect.maxX();
116 return LayoutRect(x, rect.y(), caretWidth, rect.height());
119 LayoutRect rect = textBox->localSelectionRect(caretOffset - 1, caretOffset);
120 LayoutUnit x = box->isLeftToRightDirection() ? rect.maxX() : rect.x();
121 return LayoutRect(x, rect.y(), caretWidth, rect.height());
124 FloatRect RenderSVGInlineText::floatLinesBoundingBox() const
126 FloatRect boundingBox;
127 for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox())
128 boundingBox.unite(box->calculateBoundaries());
132 IntRect RenderSVGInlineText::linesBoundingBox() const
134 return enclosingIntRect(floatLinesBoundingBox());
137 bool RenderSVGInlineText::characterStartsNewTextChunk(int position) const
139 ASSERT(position >= 0);
140 ASSERT(position < static_cast<int>(textLength()));
142 // Each <textPath> element starts a new text chunk, regardless of any x/y values.
143 if (!position && parent()->isSVGTextPath() && !previousSibling())
146 const SVGCharacterDataMap::const_iterator it = m_layoutAttributes.characterDataMap().find(static_cast<unsigned>(position + 1));
147 if (it == m_layoutAttributes.characterDataMap().end())
150 return it->value.x != SVGTextLayoutAttributes::emptyValue() || it->value.y != SVGTextLayoutAttributes::emptyValue();
153 PositionWithAffinity RenderSVGInlineText::positionForPoint(const LayoutPoint& point)
155 if (!firstTextBox() || !textLength())
156 return createPositionWithAffinity(0, DOWNSTREAM);
158 float baseline = m_scaledFont.fontMetrics().floatAscent();
160 RenderBlock* containingBlock = this->containingBlock();
161 ASSERT(containingBlock);
163 // Map local point to absolute point, as the character origins stored in the text fragments use absolute coordinates.
164 FloatPoint absolutePoint(point);
165 absolutePoint.moveBy(containingBlock->location());
167 float closestDistance = std::numeric_limits<float>::max();
168 float closestDistancePosition = 0;
169 const SVGTextFragment* closestDistanceFragment = 0;
170 SVGInlineTextBox* closestDistanceBox = 0;
172 AffineTransform fragmentTransform;
173 for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
174 if (!box->isSVGInlineTextBox())
177 SVGInlineTextBox* textBox = toSVGInlineTextBox(box);
178 Vector<SVGTextFragment>& fragments = textBox->textFragments();
180 unsigned textFragmentsSize = fragments.size();
181 for (unsigned i = 0; i < textFragmentsSize; ++i) {
182 const SVGTextFragment& fragment = fragments.at(i);
183 FloatRect fragmentRect(fragment.x, fragment.y - baseline, fragment.width, fragment.height);
184 fragment.buildFragmentTransform(fragmentTransform);
185 fragmentRect = fragmentTransform.mapRect(fragmentRect);
187 float distance = powf(fragmentRect.x() - absolutePoint.x(), 2) +
188 powf(fragmentRect.y() + fragmentRect.height() / 2 - absolutePoint.y(), 2);
190 if (distance < closestDistance) {
191 closestDistance = distance;
192 closestDistanceBox = textBox;
193 closestDistanceFragment = &fragment;
194 closestDistancePosition = fragmentRect.x();
199 if (!closestDistanceFragment)
200 return createPositionWithAffinity(0, DOWNSTREAM);
202 int offset = closestDistanceBox->offsetForPositionInFragment(*closestDistanceFragment, absolutePoint.x() - closestDistancePosition, true);
203 return createPositionWithAffinity(offset + closestDistanceBox->start(), offset > 0 ? VP_UPSTREAM_IF_POSSIBLE : DOWNSTREAM);
206 void RenderSVGInlineText::updateScaledFont()
208 computeNewScaledFontForStyle(this, style(), m_scalingFactor, m_scaledFont);
211 void RenderSVGInlineText::computeNewScaledFontForStyle(RenderObject* renderer, const RenderStyle* style, float& scalingFactor, Font& scaledFont)
216 // Alter font-size to the right on-screen value to avoid scaling the glyphs themselves, except when GeometricPrecision is specified.
217 scalingFactor = SVGRenderingContext::calculateScreenFontSizeScalingFactor(renderer);
218 if (style->effectiveZoom() == 1 && (scalingFactor == 1 || !scalingFactor)) {
220 scaledFont = style->font();
224 if (style->fontDescription().textRendering() == GeometricPrecision)
227 FontDescription fontDescription(style->fontDescription());
229 Document& document = renderer->document();
230 // FIXME: We need to better handle the case when we compute very small fonts below (below 1pt).
231 fontDescription.setComputedSize(FontSize::getComputedSizeFromSpecifiedSize(&document, scalingFactor, fontDescription.isAbsoluteSize(), fontDescription.specifiedSize(), DoNotUseSmartMinimumForFontSize));
233 scaledFont = Font(fontDescription);
234 scaledFont.update(document.styleEngine()->fontSelector());
237 LayoutRect RenderSVGInlineText::clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState) const
239 // FIXME: The following works because RenderSVGBlock has forced slow rect mapping of the paintInvalidationState.
240 // Should let this really work with paintInvalidationState's fast mapping and remove the assert.
241 ASSERT(!paintInvalidationState || !paintInvalidationState->canMapToContainer(paintInvalidationContainer));
242 return parent()->clippedOverflowRectForPaintInvalidation(paintInvalidationContainer, paintInvalidationState);
245 PassRefPtr<StringImpl> RenderSVGInlineText::originalText() const
247 RefPtr<StringImpl> result = RenderText::originalText();
250 return applySVGWhitespaceRules(result, style() && style()->whiteSpace() == PRE);