rendersvgtextpath.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * This file is part of the WebKit project.
 *
 * Copyright (C) 2007 Nikolas Zimmermann <[e-mail]>
 *
 * 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 "RenderSVGTextPath.h"

#include "FloatQuad.h"
#include "RenderBlock.h"
#include "SVGInlineTextBox.h"
#include "SVGPathElement.h"
#include "SVGRootInlineBox.h"
#include "SVGTextPathElement.h"
#include "SVGTransformList.h"

namespace WebCore {

RenderSVGTextPath::RenderSVGTextPath(Node* n)
    : RenderSVGInline(n)
    , m_startOffset(0.0f)
    , m_exactAlignment(true)
    , m_stretchMethod(false)
{
}

Path RenderSVGTextPath::layoutPath() const
{
    SVGTextPathElement* textPathElement = static_cast<SVGTextPathElement*>(node());
        String pathId = SVGURIReference::getTarget(textPathElement->href());
    Element* targetElement = textPathElement->document()->getElementById(pathId);    
    if (!targetElement || !targetElement->hasTagName(SVGNames::pathTag))
        return Path();
    
    SVGPathElement* pathElement = static_cast<SVGPathElement*>(targetElement);
    
    Path pathData = pathElement->toPathData();
    // Spec:  The transform attribute on the referenced 'path' element represents a
    // supplemental transformation relative to the current user coordinate system for
    // the current 'text' element, including any adjustments to the current user coordinate
    // system due to a possible transform attribute on the current 'text' element.
    // http://www.w3.org/TR/SVG/text.html#TextPathElement
    pathData.transform(pathElement->animatedLocalTransform());
    return pathData;
}

float RenderSVGTextPath::startOffset() const
{
    return static_cast<SVGTextPathElement*>(node())->startOffset().valueAsPercentage();
}

bool RenderSVGTextPath::exactAlignment() const
{
    return static_cast<SVGTextPathElement*>(node())->spacing() == SVG_TEXTPATH_SPACINGTYPE_EXACT;
}

bool RenderSVGTextPath::stretchMethod() const
{
    return static_cast<SVGTextPathElement*>(node())->method() == SVG_TEXTPATH_METHODTYPE_STRETCH;
}

void RenderSVGTextPath::absoluteRects(Vector<IntRect>& rects, int, int)
{
    InlineRunBox* firstBox = firstLineBox();

    SVGRootInlineBox* rootBox = firstBox ? static_cast<SVGInlineTextBox*>(firstBox)->svgRootInlineBox() : 0;
    RenderBlock* object = rootBox ? rootBox->block() : 0;

    if (!object)
        return;

    int xRef = object->x();
    int yRef = object->y();

    for (InlineRunBox* curr = firstBox; curr; curr = curr->nextLineBox()) {
        FloatRect rect(xRef + curr->x(), yRef + curr->y(), curr->width(), curr->height());
        // FIXME: broken with CSS transforms
        rects.append(enclosingIntRect(absoluteTransform().mapRect(rect)));
    }
}

void RenderSVGTextPath::absoluteQuads(Vector<FloatQuad>& quads, bool)
{
    InlineRunBox* firstBox = firstLineBox();

    SVGRootInlineBox* rootBox = firstBox ? static_cast<SVGInlineTextBox*>(firstBox)->svgRootInlineBox() : 0;
    RenderBlock* object = rootBox ? rootBox->block() : 0;

    if (!object)
        return;

    int xRef = object->x();
    int yRef = object->y();

    for (InlineRunBox* curr = firstBox; curr; curr = curr->nextLineBox()) {
        FloatRect rect(xRef + curr->x(), yRef + curr->y(), curr->width(), curr->height());
        // FIXME: broken with CSS transforms
        quads.append(absoluteTransform().mapRect(rect));
    }
}

}

#endif // ENABLE(SVG)