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/*
* Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
* Copyright (C) 2006 Apple Computer Inc.
* Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2008 Rob Buis <buis@kde.org>
* Copyright (C) Research In Motion Limited 2010. 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"
#if ENABLE(SVG)
#include "RenderSVGInlineText.h"
#include "CSSStyleSelector.h"
#include "FloatConversion.h"
#include "FloatQuad.h"
#include "RenderBlock.h"
#include "RenderSVGRoot.h"
#include "RenderSVGText.h"
#include "Settings.h"
#include "SVGImageBufferTools.h"
#include "SVGInlineTextBox.h"
#include "SVGRootInlineBox.h"
#include "VisiblePosition.h"
namespace WebCore {
static PassRefPtr<StringImpl> applySVGWhitespaceRules(PassRefPtr<StringImpl> string, bool preserveWhiteSpace)
{
if (preserveWhiteSpace) {
// Spec: When xml:space="preserve", the SVG user agent will do the following using a
// copy of the original character data content. It will convert all newline and tab
// characters into space characters. Then, it will draw all space characters, including
// leading, trailing and multiple contiguous space characters.
RefPtr<StringImpl> newString = string->replace('\t', ' ');
newString = newString->replace('\n', ' ');
newString = newString->replace('\r', ' ');
return newString.release();
}
// Spec: When xml:space="default", the SVG user agent will do the following using a
// copy of the original character data content. First, it will remove all newline
// characters. Then it will convert all tab characters into space characters.
// Then, it will strip off all leading and trailing space characters.
// Then, all contiguous space characters will be consolidated.
RefPtr<StringImpl> newString = string->replace('\n', StringImpl::empty());
newString = newString->replace('\r', StringImpl::empty());
newString = newString->replace('\t', ' ');
return newString.release();
}
RenderSVGInlineText::RenderSVGInlineText(Node* n, PassRefPtr<StringImpl> string)
: RenderText(n, applySVGWhitespaceRules(string, false))
, m_scalingFactor(1)
{
}
void RenderSVGInlineText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
RenderText::styleDidChange(diff, oldStyle);
if (diff == StyleDifferenceLayout) {
// The text metrics may be influenced by style changes.
if (RenderSVGText* textRenderer = RenderSVGText::locateRenderSVGTextAncestor(this))
textRenderer->setNeedsPositioningValuesUpdate();
updateScaledFont();
}
const RenderStyle* newStyle = style();
if (!newStyle || newStyle->whiteSpace() != PRE)
return;
if (!oldStyle || oldStyle->whiteSpace() != PRE)
setText(applySVGWhitespaceRules(originalText(), true), true);
}
InlineTextBox* RenderSVGInlineText::createTextBox()
{
InlineTextBox* box = new (renderArena()) SVGInlineTextBox(this);
box->setHasVirtualLogicalHeight();
return box;
}
IntRect RenderSVGInlineText::localCaretRect(InlineBox* box, int caretOffset, int*)
{
if (!box->isInlineTextBox())
return IntRect();
InlineTextBox* textBox = static_cast<InlineTextBox*>(box);
if (static_cast<unsigned>(caretOffset) < textBox->start() || static_cast<unsigned>(caretOffset) > textBox->start() + textBox->len())
return IntRect();
// Use the edge of the selection rect to determine the caret rect.
if (static_cast<unsigned>(caretOffset) < textBox->start() + textBox->len()) {
IntRect rect = textBox->selectionRect(0, 0, caretOffset, caretOffset + 1);
int x = box->isLeftToRightDirection() ? rect.x() : rect.maxX();
return IntRect(x, rect.y(), caretWidth, rect.height());
}
IntRect rect = textBox->selectionRect(0, 0, caretOffset - 1, caretOffset);
int x = box->isLeftToRightDirection() ? rect.maxX() : rect.x();
return IntRect(x, rect.y(), caretWidth, rect.height());
}
IntRect RenderSVGInlineText::linesBoundingBox() const
{
IntRect boundingBox;
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox())
boundingBox.unite(box->calculateBoundaries());
return boundingBox;
}
bool RenderSVGInlineText::characterStartsNewTextChunk(int position) const
{
ASSERT(m_attributes.xValues().size() == textLength());
ASSERT(m_attributes.yValues().size() == textLength());
ASSERT(position >= 0);
ASSERT(position < static_cast<int>(textLength()));
// Each <textPath> element starts a new text chunk, regardless of any x/y values.
if (!position && parent()->isSVGTextPath() && !previousSibling())
return true;
int currentPosition = 0;
unsigned size = m_attributes.textMetricsValues().size();
for (unsigned i = 0; i < size; ++i) {
const SVGTextMetrics& metrics = m_attributes.textMetricsValues().at(i);
// We found the desired character.
if (currentPosition == position) {
return m_attributes.xValues().at(position) != SVGTextLayoutAttributes::emptyValue()
|| m_attributes.yValues().at(position) != SVGTextLayoutAttributes::emptyValue();
}
currentPosition += metrics.length();
if (currentPosition > position)
break;
}
// The desired position is available in the x/y list, but not in the character data values list.
// That means the previous character data described a single glyph, consisting of multiple unicode characters.
// The consequence is that the desired character does not define a new absolute x/y position, even if present in the x/y test.
// This code is tested by svg/W3C-SVG-1.1/text-text-06-t.svg (and described in detail, why this influences chunk detection).
return false;
}
VisiblePosition RenderSVGInlineText::positionForPoint(const IntPoint& point)
{
if (!firstTextBox() || !textLength())
return createVisiblePosition(0, DOWNSTREAM);
float baseline = m_scaledFont.fontMetrics().floatAscent();
RenderBlock* containingBlock = this->containingBlock();
ASSERT(containingBlock);
// Map local point to absolute point, as the character origins stored in the text fragments use absolute coordinates.
FloatPoint absolutePoint(point);
absolutePoint.move(containingBlock->x(), containingBlock->y());
float closestDistance = std::numeric_limits<float>::max();
float closestDistancePosition = 0;
const SVGTextFragment* closestDistanceFragment = 0;
SVGInlineTextBox* closestDistanceBox = 0;
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
ASSERT(box->isSVGInlineTextBox());
SVGInlineTextBox* textBox = static_cast<SVGInlineTextBox*>(box);
Vector<SVGTextFragment>& fragments = textBox->textFragments();
unsigned textFragmentsSize = fragments.size();
for (unsigned i = 0; i < textFragmentsSize; ++i) {
const SVGTextFragment& fragment = fragments.at(i);
FloatRect fragmentRect(fragment.x, fragment.y - baseline, fragment.width, fragment.height);
if (!fragment.transform.isIdentity())
fragmentRect = fragment.transform.mapRect(fragmentRect);
float distance = powf(fragmentRect.x() - absolutePoint.x(), 2) +
powf(fragmentRect.y() + fragmentRect.height() / 2 - absolutePoint.y(), 2);
if (distance < closestDistance) {
closestDistance = distance;
closestDistanceBox = textBox;
closestDistanceFragment = &fragment;
closestDistancePosition = fragmentRect.x();
}
}
}
if (!closestDistanceFragment)
return createVisiblePosition(0, DOWNSTREAM);
int offset = closestDistanceBox->offsetForPositionInFragment(*closestDistanceFragment, absolutePoint.x() - closestDistancePosition, true);
return createVisiblePosition(offset + closestDistanceBox->start(), offset > 0 ? VP_UPSTREAM_IF_POSSIBLE : DOWNSTREAM);
}
void RenderSVGInlineText::updateScaledFont()
{
computeNewScaledFontForStyle(this, style(), m_scalingFactor, m_scaledFont);
}
void RenderSVGInlineText::computeNewScaledFontForStyle(RenderObject* renderer, const RenderStyle* style, float& scalingFactor, Font& scaledFont)
{
ASSERT(style);
ASSERT(renderer);
Document* document = renderer->document();
ASSERT(document);
CSSStyleSelector* styleSelector = document->styleSelector();
ASSERT(styleSelector);
// Alter font-size to the right on-screen value, to avoid scaling the glyphs themselves.
AffineTransform ctm;
SVGImageBufferTools::calculateTransformationToOutermostSVGCoordinateSystem(renderer, ctm);
scalingFactor = narrowPrecisionToFloat(sqrt((pow(ctm.xScale(), 2) + pow(ctm.yScale(), 2)) / 2));
if (scalingFactor == 1 || !scalingFactor) {
scalingFactor = 1;
scaledFont = style->font();
return;
}
FontDescription fontDescription(style->fontDescription());
fontDescription.setComputedSize(fontDescription.computedSize() * scalingFactor);
scaledFont = Font(fontDescription, 0, 0);
scaledFont.update(styleSelector->fontSelector());
}
}
#endif // ENABLE(SVG)
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