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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 "core/layout/svg/LayoutSVGInlineText.h"
#include "core/css/CSSFontSelector.h"
#include "core/css/FontSize.h"
#include "core/dom/StyleEngine.h"
#include "core/editing/TextAffinity.h"
#include "core/editing/VisiblePosition.h"
#include "core/layout/svg/LayoutSVGText.h"
#include "core/layout/svg/SVGLayoutSupport.h"
#include "core/layout/svg/line/SVGInlineTextBox.h"
namespace blink {
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();
}
LayoutSVGInlineText::LayoutSVGInlineText(Node* n, PassRefPtr<StringImpl> string)
: LayoutText(n, applySVGWhitespaceRules(string, false))
, m_scalingFactor(1)
, m_layoutAttributes(this)
{
}
void LayoutSVGInlineText::setTextInternal(PassRefPtr<StringImpl> text)
{
LayoutText::setTextInternal(text);
if (LayoutSVGText* textLayoutObject = LayoutSVGText::locateLayoutSVGTextAncestor(this))
textLayoutObject->subtreeTextDidChange(this);
}
void LayoutSVGInlineText::styleDidChange(StyleDifference diff, const ComputedStyle* oldStyle)
{
LayoutText::styleDidChange(diff, oldStyle);
updateScaledFont();
bool newPreserves = style() ? style()->whiteSpace() == PRE : false;
bool oldPreserves = oldStyle ? oldStyle->whiteSpace() == PRE : false;
if (oldPreserves != newPreserves) {
setText(originalText(), true);
return;
}
if (!diff.needsFullLayout())
return;
// The text metrics may be influenced by style changes.
if (LayoutSVGText* textLayoutObject = LayoutSVGText::locateLayoutSVGTextAncestor(this)) {
textLayoutObject->setNeedsTextMetricsUpdate();
textLayoutObject->setNeedsLayoutAndFullPaintInvalidation(LayoutInvalidationReason::StyleChange);
}
}
InlineTextBox* LayoutSVGInlineText::createTextBox(int start, unsigned short length)
{
InlineTextBox* box = new SVGInlineTextBox(LineLayoutItem(this), start, length);
box->setHasVirtualLogicalHeight();
return box;
}
LayoutRect LayoutSVGInlineText::localCaretRect(InlineBox* box, int caretOffset, LayoutUnit*)
{
if (!box || !box->isInlineTextBox())
return LayoutRect();
InlineTextBox* textBox = toInlineTextBox(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 = box->isLeftToRightDirection() ? rect.x() : rect.maxX();
return LayoutRect(x, rect.y(), caretWidth(), rect.height());
}
LayoutRect rect = textBox->localSelectionRect(caretOffset - 1, caretOffset);
LayoutUnit x = box->isLeftToRightDirection() ? rect.maxX() : rect.x();
return LayoutRect(x, rect.y(), caretWidth(), rect.height());
}
FloatRect LayoutSVGInlineText::floatLinesBoundingBox() const
{
FloatRect boundingBox;
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox())
boundingBox.unite(FloatRect(box->calculateBoundaries()));
return boundingBox;
}
IntRect LayoutSVGInlineText::linesBoundingBox() const
{
return enclosingIntRect(floatLinesBoundingBox());
}
bool LayoutSVGInlineText::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 !SVGTextLayoutAttributes::isEmptyValue(it->value.x) || !SVGTextLayoutAttributes::isEmptyValue(it->value.y);
}
PositionWithAffinity LayoutSVGInlineText::positionForPoint(const LayoutPoint& point)
{
if (!hasTextBoxes() || !textLength())
return createPositionWithAffinity(0);
ASSERT(m_scalingFactor);
float baseline = m_scaledFont.getFontMetrics().floatAscent() / m_scalingFactor;
LayoutBlock* 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;
for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
if (!box->isSVGInlineTextBox())
continue;
SVGInlineTextBox* textBox = toSVGInlineTextBox(box);
for (const SVGTextFragment& fragment : textBox->textFragments()) {
FloatRect fragmentRect = fragment.boundingBox(baseline);
float distance = 0;
if (!fragmentRect.contains(absolutePoint))
distance = fragmentRect.squaredDistanceTo(absolutePoint);
if (distance <= closestDistance) {
closestDistance = distance;
closestDistanceBox = textBox;
closestDistanceFragment = &fragment;
closestDistancePosition = fragmentRect.x();
}
}
}
if (!closestDistanceFragment)
return createPositionWithAffinity(0);
int offset = closestDistanceBox->offsetForPositionInFragment(*closestDistanceFragment, LayoutUnit(absolutePoint.x() - closestDistancePosition), true);
return createPositionWithAffinity(offset + closestDistanceBox->start(), offset > 0 ? VP_UPSTREAM_IF_POSSIBLE : TextAffinity::Downstream);
}
void LayoutSVGInlineText::updateScaledFont()
{
computeNewScaledFontForStyle(this, m_scalingFactor, m_scaledFont);
}
void LayoutSVGInlineText::computeNewScaledFontForStyle(LayoutObject* layoutObject, float& scalingFactor, Font& scaledFont)
{
const ComputedStyle* style = layoutObject->style();
ASSERT(style);
ASSERT(layoutObject);
// Alter font-size to the right on-screen value to avoid scaling the glyphs themselves, except when GeometricPrecision is specified.
scalingFactor = SVGLayoutSupport::calculateScreenFontSizeScalingFactor(layoutObject);
if (style->effectiveZoom() == 1 && (scalingFactor == 1 || !scalingFactor)) {
scalingFactor = 1;
scaledFont = style->font();
return;
}
if (style->getFontDescription().textRendering() == GeometricPrecision)
scalingFactor = 1;
FontDescription fontDescription(style->getFontDescription());
Document& document = layoutObject->document();
// FIXME: We need to better handle the case when we compute very small fonts below (below 1pt).
fontDescription.setComputedSize(FontSize::getComputedSizeFromSpecifiedSize(&document, scalingFactor, fontDescription.isAbsoluteSize(), fontDescription.specifiedSize(), DoNotUseSmartMinimumForFontSize));
scaledFont = Font(fontDescription);
scaledFont.update(document.styleEngine().fontSelector());
}
LayoutRect LayoutSVGInlineText::clippedOverflowRectForPaintInvalidation(const LayoutBoxModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState) const
{
// FIXME: The following works because LayoutSVGBlock has forced slow rect mapping of the paintInvalidationState.
// Should let this really work with paintInvalidationState's fast mapping and remove the assert.
ASSERT(!paintInvalidationState || !paintInvalidationState->canMapToAncestor(paintInvalidationContainer));
return parent()->clippedOverflowRectForPaintInvalidation(paintInvalidationContainer, nullptr);
}
PassRefPtr<StringImpl> LayoutSVGInlineText::originalText() const
{
RefPtr<StringImpl> result = LayoutText::originalText();
if (!result)
return nullptr;
return applySVGWhitespaceRules(result, style() && style()->whiteSpace() == PRE);
}
} // namespace blink
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