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/*
* Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
* Copyright (C) 2006 Apple 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"
#include "RenderSVGInlineText.h"
#include "CSSFontSelector.h"
#include "FloatConversion.h"
#include "FloatQuad.h"
#include "RenderBlock.h"
#include "RenderSVGRoot.h"
#include "RenderSVGText.h"
#include "Settings.h"
#include "SVGInlineTextBox.h"
#include "SVGRenderingContext.h"
#include "SVGRootInlineBox.h"
#include "StyleFontSizeFunctions.h"
#include "StyleResolver.h"
#include "VisiblePosition.h"
namespace WebCore {
static String applySVGWhitespaceRules(const String& string, bool preserveWhiteSpace)
{
String newString = string;
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.
newString.replace('\t', ' ');
newString.replace('\n', ' ');
newString.replace('\r', ' ');
return newString;
}
// 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.
newString.replace('\n', emptyString());
newString.replace('\r', emptyString());
newString.replace('\t', ' ');
return newString;
}
RenderSVGInlineText::RenderSVGInlineText(Text& textNode, const String& string)
: RenderText(textNode, applySVGWhitespaceRules(string, false))
, m_scalingFactor(1)
, m_layoutAttributes(*this)
{
}
String RenderSVGInlineText::originalText() const
{
return textNode().data();
}
void RenderSVGInlineText::setRenderedText(const String& text)
{
RenderText::setRenderedText(text);
if (auto* textAncestor = RenderSVGText::locateRenderSVGTextAncestor(*this))
textAncestor->subtreeTextDidChange(this);
}
void RenderSVGInlineText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
RenderText::styleDidChange(diff, oldStyle);
updateScaledFont();
bool newPreserves = style().whiteSpace() == PRE;
bool oldPreserves = oldStyle ? oldStyle->whiteSpace() == PRE : false;
if (oldPreserves && !newPreserves) {
setText(applySVGWhitespaceRules(originalText(), false), true);
return;
}
if (!oldPreserves && newPreserves) {
setText(applySVGWhitespaceRules(originalText(), true), true);
return;
}
if (diff != StyleDifferenceLayout)
return;
// The text metrics may be influenced by style changes.
if (auto* textAncestor = RenderSVGText::locateRenderSVGTextAncestor(*this))
textAncestor->subtreeStyleDidChange(this);
}
std::unique_ptr<InlineTextBox> RenderSVGInlineText::createTextBox()
{
auto box = std::make_unique<SVGInlineTextBox>(*this);
box->setHasVirtualLogicalHeight();
return WTFMove(box);
}
LayoutRect RenderSVGInlineText::localCaretRect(InlineBox* box, int caretOffset, LayoutUnit*)
{
if (!is<InlineTextBox>(box))
return LayoutRect();
auto& textBox = downcast<InlineTextBox>(*box);
if (static_cast<unsigned>(caretOffset) < textBox.start() || static_cast<unsigned>(caretOffset) > textBox.start() + textBox.len())
return LayoutRect();
// Use the edge of the selection rect to determine the caret rect.
if (static_cast<unsigned>(caretOffset) < textBox.start() + textBox.len()) {
LayoutRect rect = textBox.localSelectionRect(caretOffset, caretOffset + 1);
LayoutUnit x = textBox.isLeftToRightDirection() ? rect.x() : rect.maxX();
return LayoutRect(x, rect.y(), caretWidth, rect.height());
}
LayoutRect rect = textBox.localSelectionRect(caretOffset - 1, caretOffset);
LayoutUnit x = textBox.isLeftToRightDirection() ? rect.maxX() : rect.x();
return LayoutRect(x, rect.y(), caretWidth, rect.height());
}
FloatRect RenderSVGInlineText::floatLinesBoundingBox() const
{
FloatRect boundingBox;
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox())
boundingBox.unite(box->calculateBoundaries());
return boundingBox;
}
IntRect RenderSVGInlineText::linesBoundingBox() const
{
return enclosingIntRect(floatLinesBoundingBox());
}
bool RenderSVGInlineText::characterStartsNewTextChunk(int position) const
{
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;
const SVGCharacterDataMap::const_iterator it = m_layoutAttributes.characterDataMap().find(static_cast<unsigned>(position + 1));
if (it == m_layoutAttributes.characterDataMap().end())
return false;
return it->value.x != SVGTextLayoutAttributes::emptyValue() || it->value.y != SVGTextLayoutAttributes::emptyValue();
}
VisiblePosition RenderSVGInlineText::positionForPoint(const LayoutPoint& point, const RenderRegion*)
{
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.moveBy(containingBlock->location());
float closestDistance = std::numeric_limits<float>::max();
float closestDistancePosition = 0;
const SVGTextFragment* closestDistanceFragment = nullptr;
SVGInlineTextBox* closestDistanceBox = nullptr;
AffineTransform fragmentTransform;
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
if (!is<SVGInlineTextBox>(*box))
continue;
auto& textBox = downcast<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);
fragment.buildFragmentTransform(fragmentTransform);
if (!fragmentTransform.isIdentity())
fragmentRect = fragmentTransform.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(const RenderObject& renderer, const RenderStyle& style, float& scalingFactor, FontCascade& scaledFont)
{
// Alter font-size to the right on-screen value to avoid scaling the glyphs themselves, except when GeometricPrecision is specified
scalingFactor = SVGRenderingContext::calculateScreenFontSizeScalingFactor(renderer);
if (!scalingFactor || style.fontDescription().textRenderingMode() == GeometricPrecision) {
scalingFactor = 1;
scaledFont = style.fontCascade();
return;
}
auto fontDescription = style.fontDescription();
// FIXME: We need to better handle the case when we compute very small fonts below (below 1pt).
fontDescription.setComputedSize(Style::computedFontSizeFromSpecifiedSizeForSVGInlineText(fontDescription.computedSize(), fontDescription.isAbsoluteSize(), scalingFactor, renderer.document()));
scaledFont = FontCascade(fontDescription, 0, 0);
scaledFont.update(&renderer.document().fontSelector());
}
}
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