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KDECore

ksvgiconengine.cpp

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/*
    Copyright (C) 2002 Nikolas Zimmermann <wildfox@kde.org>
    This file is part of the KDE project

    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 <qdom.h>
#include <qfile.h>
#include <qcolor.h>
#include <qimage.h>
#include <qwmatrix.h>
#include <qregexp.h>

#include <kmdcodec.h>

#include <zlib.h>

#include "ksvgiconpainter.h"
#include "ksvgiconengine.h"

class KSVGIconEngineHelper
{
public:
    KSVGIconEngineHelper(KSVGIconEngine *engine)
    {
        m_engine = engine;
    }

    ~KSVGIconEngineHelper()
    {
    }

    double toPixel(const QString &s, bool hmode)
    {
        return m_engine->painter()->toPixel(s, hmode);
    }

    ArtGradientStop *parseGradientStops(QDomElement element, int &offsets)
    {
        if (!element.hasChildNodes())
            return 0;

        QValueList<ArtGradientStop> stopList;

        float oldOffset = -1, newOffset = -1;
        for(QDomNode node = element.firstChild(); !node.isNull(); node = node.nextSibling())
        {
            QDomElement element = node.toElement();

            oldOffset = newOffset;
            QString temp = element.attribute("offset");

            if(temp.contains("%"))
            {
                temp = temp.left(temp.length() - 1);
                newOffset = temp.toFloat() / 100.0;
            }
            else
                newOffset = temp.toFloat();

            // Spec  skip double offset specifications
            if(oldOffset == newOffset)
                continue;

            offsets++;
            stopList.append(ArtGradientStop());

            ArtGradientStop &stop = stopList.last();

            stop.offset = newOffset;

            QString parseOpacity;
            QString parseColor;

            if(element.hasAttribute("stop-opacity"))
                parseOpacity = element.attribute("stop-opacity");

            if(element.hasAttribute("stop-color"))
                parseColor = element.attribute("stop-color");

            if(parseOpacity.isEmpty() || parseColor.isEmpty())
            {
                QString style = element.attribute("style");

                QStringList substyles = QStringList::split(';', style);
                for(QStringList::Iterator it = substyles.begin(); it != substyles.end(); ++it)
                {
                    QStringList substyle = QStringList::split(':', (*it));
                    QString command = substyle[0];
                    QString params = substyle[1];
                    command = command.stripWhiteSpace();
                    params = params.stripWhiteSpace();

                    if(command == "stop-color")
                    {
                        parseColor = params;

                        if(!parseOpacity.isEmpty())
                            break;
                    }
                    else if(command == "stop-opacity")
                    {
                        parseOpacity = params;

                        if(!parseColor.isEmpty())
                            break;
                    }
                }
            }

            // Parse color using KSVGIconPainter (which uses Qt)
            // Supports all svg-needed color formats
            QColor qStopColor = m_engine->painter()->parseColor(parseColor);

            // Convert in a libart suitable form
            Q_UINT32 stopColor = m_engine->painter()->toArtColor(qStopColor);

            int opacity = m_engine->painter()->parseOpacity(parseOpacity);

            Q_UINT32 rgba = (stopColor << 8) | opacity;
            Q_UINT32 r, g, b, a;

            // Convert from separated to premultiplied alpha
            a = rgba & 0xff;
            r = (rgba >> 24) * a + 0x80;
            r = (r + (r >> 8)) >> 8;
            g = ((rgba >> 16) & 0xff) * a + 0x80;
            g = (g + (g >> 8)) >> 8;
            b = ((rgba >> 8) & 0xff) * a + 0x80;
            b = (b + (b >> 8)) >> 8;

            stop.color[0] = ART_PIX_MAX_FROM_8(r);
            stop.color[1] = ART_PIX_MAX_FROM_8(g);
            stop.color[2] = ART_PIX_MAX_FROM_8(b);
            stop.color[3] = ART_PIX_MAX_FROM_8(a);
        }

        if (stopList.isEmpty())
            return 0;

        ArtGradientStop *stops = new ArtGradientStop[stopList.count()];

        QValueList<ArtGradientStop>::iterator it = stopList.begin();
        QValueList<ArtGradientStop>::iterator end = stopList.end();

        for (int i = 0; it != end; ++i, ++it)
            stops[i] = *it;

        return stops;
    }

    QPointArray parsePoints(QString points)
    {
        if(points.isEmpty())
            return QPointArray();

        points = points.simplifyWhiteSpace();

        if(points.contains(",,") || points.contains(", ,"))
            return QPointArray();

        points.replace(',', ' ');
        points.replace('\r', QString::null);
        points.replace('\n', QString::null);

        points = points.simplifyWhiteSpace();

        QStringList pointList = QStringList::split(' ', points);

        QPointArray array(pointList.count() / 2);
        int i = 0;

        for(QStringList::Iterator it = pointList.begin(); it != pointList.end(); it++)
        {
            float x = (*(it++)).toFloat();
            float y = (*(it)).toFloat();

            array.setPoint(i, static_cast<int>(x), static_cast<int>(y));
            i++;
        }

        return array;
    }

    void parseTransform(const QString &transform)
    {
        // Combine new and old matrix
        QWMatrix matrix = m_engine->painter()->parseTransform(transform);

        QWMatrix *current = m_engine->painter()->worldMatrix();
        *current = matrix * *current;
    }

    void parseCommonAttributes(QDomNode &node)
    {
        // Set important default attributes
        m_engine->painter()->setFillColor("black");
        m_engine->painter()->setStrokeColor("none");
        m_engine->painter()->setStrokeDashArray("");
        m_engine->painter()->setStrokeWidth(1);
        m_engine->painter()->setJoinStyle("");
        m_engine->painter()->setCapStyle("");
    //  m_engine->painter()->setFillOpacity(255, true);
    //  m_engine->painter()->setStrokeOpacity(255, true);

        // Collect parent node's attributes
        QPtrList<QDomNamedNodeMap> applyList;
        applyList.setAutoDelete(true);

        QDomNode shape = node.parentNode();
        for(; !shape.isNull() ; shape = shape.parentNode())
            applyList.prepend(new QDomNamedNodeMap(shape.attributes()));

        // Apply parent attributes
        for(QDomNamedNodeMap *map = applyList.first(); map != 0; map = applyList.next())
        {
            QDomNamedNodeMap attr = *map;

            for(unsigned int i = 0; i < attr.count(); i++)
            {
                QString name, value;

                name = attr.item(i).nodeName().lower();
                value = attr.item(i).nodeValue();

                if(name == "transform")
                    parseTransform(value);
                else if(name == "style")
                    parseStyle(value);
                else
                    parsePA(name, value);
            }
        }

        // Apply local attributes
        QDomNamedNodeMap attr = node.attributes();

        for(unsigned int i = 0; i < attr.count(); i++)
        {
            QDomNode current = attr.item(i);

            if(current.nodeName().lower() == "transform")
                parseTransform(current.nodeValue());
            else if(current.nodeName().lower() == "style")
                parseStyle(current.nodeValue());
            else
                parsePA(current.nodeName().lower(), current.nodeValue());
        }
    }

    bool handleTags(QDomElement element, bool paint)
    {
        if(element.attribute("display") == "none")
            return false;
        if(element.tagName() == "linearGradient")
        {
            ArtGradientLinear *gradient = new ArtGradientLinear();

            int offsets = -1;
            gradient->stops = parseGradientStops(element, offsets);
            gradient->n_stops = offsets + 1;

            QString spread = element.attribute("spreadMethod");
            if(spread == "repeat")
                gradient->spread = ART_GRADIENT_REPEAT;
            else if(spread == "reflect")
                gradient->spread = ART_GRADIENT_REFLECT;
            else
                gradient->spread = ART_GRADIENT_PAD;

            m_engine->painter()->addLinearGradient(element.attribute("id"), gradient);
            m_engine->painter()->addLinearGradientElement(gradient, element);
            return true;
        }
        else if(element.tagName() == "radialGradient")
        {
            ArtGradientRadial *gradient = new ArtGradientRadial();

            int offsets = -1;
            gradient->stops = parseGradientStops(element, offsets);
            gradient->n_stops = offsets + 1;

            m_engine->painter()->addRadialGradient(element.attribute("id"), gradient);
            m_engine->painter()->addRadialGradientElement(gradient, element);
            return true;
        }

        if(!paint)
            return true;

        // TODO: Default attribute values
        if(element.tagName() == "rect")
        {
            double x = toPixel(element.attribute("x"), true);
            double y = toPixel(element.attribute("y"), false);
            double w = toPixel(element.attribute("width"), true);
            double h = toPixel(element.attribute("height"), false);

            double rx = 0.0;
            double ry = 0.0;

            if(element.hasAttribute("rx"))
                rx = toPixel(element.attribute("rx"), true);

            if(element.hasAttribute("ry"))
                ry = toPixel(element.attribute("ry"), false);

            m_engine->painter()->drawRectangle(x, y, w, h, rx, ry);
        }
        else if(element.tagName() == "switch")
        {
            QDomNode iterate = element.firstChild();

            while(!iterate.isNull())
            {
                // Reset matrix
                m_engine->painter()->setWorldMatrix(new QWMatrix(m_initialMatrix));

                // Parse common attributes, style / transform
                parseCommonAttributes(iterate);

                if(handleTags(iterate.toElement(), true))
                    return true;
                iterate = iterate.nextSibling();
            }
            return true;
        }
        else if(element.tagName() == "g" || element.tagName() == "defs")
        {
            QDomNode iterate = element.firstChild();

            while(!iterate.isNull())
            {
                // Reset matrix
                m_engine->painter()->setWorldMatrix(new QWMatrix(m_initialMatrix));

                // Parse common attributes, style / transform
                parseCommonAttributes(iterate);

                handleTags(iterate.toElement(), (element.tagName() == "defs") ? false : true);
                iterate = iterate.nextSibling();
            }
            return true;
        }
        else if(element.tagName() == "line")
        {
            double x1 = toPixel(element.attribute("x1"), true);
            double y1 = toPixel(element.attribute("y1"), false);
            double x2 = toPixel(element.attribute("x2"), true);
            double y2 = toPixel(element.attribute("y2"), false);

            m_engine->painter()->drawLine(x1, y1, x2, y2);
            return true;
        }
        else if(element.tagName() == "circle")
        {
            double cx = toPixel(element.attribute("cx"), true);
            double cy = toPixel(element.attribute("cy"), false);

            double r = toPixel(element.attribute("r"), true); // TODO: horiz correct?

            m_engine->painter()->drawEllipse(cx, cy, r, r);
            return true;
        }
        else if(element.tagName() == "ellipse")
        {
            double cx = toPixel(element.attribute("cx"), true);
            double cy = toPixel(element.attribute("cy"), false);

            double rx = toPixel(element.attribute("rx"), true);
            double ry = toPixel(element.attribute("ry"), false);

            m_engine->painter()->drawEllipse(cx, cy, rx, ry);
            return true;
        }
        else if(element.tagName() == "polyline")
        {
            QPointArray polyline = parsePoints(element.attribute("points"));
            m_engine->painter()->drawPolyline(polyline);
            return true;
        }
        else if(element.tagName() == "polygon")
        {
            QPointArray polygon = parsePoints(element.attribute("points"));
            m_engine->painter()->drawPolygon(polygon);
            return true;
        }
        else if(element.tagName() == "path")
        {
            bool filled = true;

            if(element.hasAttribute("fill") && element.attribute("fill").contains("none"))
                filled = false;

            if(element.attribute("style").contains("fill") && element.attribute("style").stripWhiteSpace().contains("fill:none"))
                filled = false;

            m_engine->painter()->drawPath(element.attribute("d"), filled);
            return true;
        }
        else if(element.tagName() == "image")
        {
            double x = toPixel(element.attribute("x"), true);
            double y = toPixel(element.attribute("y"), false);
            double w = toPixel(element.attribute("width"), true);
            double h = toPixel(element.attribute("height"), false);

            QString href = element.attribute("xlink:href");

            QImage image;
            if(href.startsWith("data:"))
            {
                // Get input
                QCString input = href.remove(QRegExp("^data:image/.*;base64,")).utf8();

                // Decode into 'output'
                QByteArray output;
                KCodecs::base64Decode(input, output);

                // Display
                image.loadFromData(output);
            }
            else
                image.load(href);

            if (!image.isNull())
            {
                // Scale, if needed
                if(image.width() != (int) w || image.height() != (int) h)
                    image = image.smoothScale((int) w, (int) h, QImage::ScaleFree);

                m_engine->painter()->drawImage(x, y, image);
            }

            return true;
        }
        return false;
    }

    void parseStyle(const QString &style)
    {
        QStringList substyles = QStringList::split(';', style);
        for(QStringList::Iterator it = substyles.begin(); it != substyles.end(); ++it)
        {
            QStringList substyle = QStringList::split(':', (*it));
            QString command = substyle[0];
            QString params = substyle[1];
            command = command.stripWhiteSpace();
            params = params.stripWhiteSpace();

            parsePA(command, params);
        }
    }

    void parsePA(const QString &command, const QString &value)
    {
        if(command == "stroke-width") // TODO: horiz:false correct?
            m_engine->painter()->setStrokeWidth(toPixel(value, false));
        else if(command == "stroke-miterlimit")
            m_engine->painter()->setStrokeMiterLimit(value);
        else if(command == "stroke-linecap")
            m_engine->painter()->setCapStyle(value);
        else if(command == "stroke-linejoin")
            m_engine->painter()->setJoinStyle(value);
        else if(command == "stroke-dashoffset")
            m_engine->painter()->setStrokeDashOffset(value);
        else if(command == "stroke-dasharray" && value != "none")
            m_engine->painter()->setStrokeDashArray(value);
        else if(command == "stroke")
            m_engine->painter()->setStrokeColor(value);
        else if(command == "fill")
            m_engine->painter()->setFillColor(value);
        else if(command == "fill-rule")
            m_engine->painter()->setFillRule(value);
        else if(command == "fill-opacity" || command == "stroke-opacity" || command == "opacity")
        {
            if(command == "fill-opacity")
                m_engine->painter()->setFillOpacity(value);
            else if(command == "stroke-value")
                m_engine->painter()->setStrokeOpacity(value);
            else
            {
                m_engine->painter()->setOpacity(value);
                m_engine->painter()->setFillOpacity(value);
                m_engine->painter()->setStrokeOpacity(value);
            }
        }
    }

private:
    friend class KSVGIconEngine;

    KSVGIconEngine *m_engine;
    QWMatrix m_initialMatrix;
};

struct KSVGIconEngine::Private
{
    KSVGIconPainter *painter;
    KSVGIconEngineHelper *helper;

    double width;
    double height;
};

KSVGIconEngine::KSVGIconEngine() : d(new Private())
{
    d->painter = 0;
    d->helper = new KSVGIconEngineHelper(this);

    d->width = 0.0;
    d->height = 0.0;
}

KSVGIconEngine::~KSVGIconEngine()
{
    if(d->painter)
        delete d->painter;

    delete d->helper;

    delete d;
}

bool KSVGIconEngine::load(int width, int height, const QString &path)
{
    QDomDocument svgDocument("svg");
    QFile file(path);

    if(path.right(3).upper() == "SVG")
    {
        // Open SVG Icon
        if(!file.open(IO_ReadOnly))
            return false;

        svgDocument.setContent(&file);
    }
    else // SVGZ
    {
        gzFile svgz = gzopen(path.latin1(), "ro");
        if(!svgz)
            return false;

        QString data;
        bool done = false;

        QCString buffer(1024);
        int length = 0;

        while(!done)
        {
            int ret = gzread(svgz, buffer.data() + length, 1024);
            if(ret == 0)
                done = true;
            else if(ret == -1)
                return false;
            else {
                buffer.resize(buffer.size()+1024);
                length += ret;
            }
        }

        gzclose(svgz);

        svgDocument.setContent(buffer);
    }

    if(svgDocument.isNull())
        return false;

    // Check for root element
    QDomNode rootNode = svgDocument.namedItem("svg");
    if(rootNode.isNull() || !rootNode.isElement())
        return false;

    // Detect width and height
    QDomElement rootElement = rootNode.toElement();

    // Create icon painter
    d->painter = new KSVGIconPainter(width, height);

    d->width = width; // this sets default for no width -> 100% case
    if(rootElement.hasAttribute("width"))
        d->width = d->helper->toPixel(rootElement.attribute("width"), true);

    d->height = height; // this sets default for no height -> 100% case
    if(rootElement.hasAttribute("height"))
        d->height = d->helper->toPixel(rootElement.attribute("height"), false);

    // Create icon painter
    d->painter->setDrawWidth(static_cast<int>(d->width));
    d->painter->setDrawHeight(static_cast<int>(d->height));

    // Set viewport clipping rect
    d->painter->setClippingRect(0, 0, width, height);

    // Apply viewbox
    if(rootElement.hasAttribute("viewBox"))
    {
        QStringList points = QStringList::split(' ', rootElement.attribute("viewBox").simplifyWhiteSpace());

        float w = points[2].toFloat();
        float h = points[3].toFloat();

        double vratiow = width / w;
        double vratioh = height / h;

        d->width = w;
        d->height = h;

        d->painter->worldMatrix()->scale(vratiow, vratioh);
    }
    else
    {
        // Fit into 'width' and 'height'
        // FIXME: Use an aspect ratio
        double ratiow = width / d->width;
        double ratioh = height / d->height;

        d->painter->worldMatrix()->scale(ratiow, ratioh);
    }

    QWMatrix initialMatrix = *d->painter->worldMatrix();
    d->helper->m_initialMatrix = initialMatrix;

    // Apply transform
    if(rootElement.hasAttribute("transform"))
        d->helper->parseTransform(rootElement.attribute("transform"));

    // Go through all elements
    QDomNode svgNode = rootElement.firstChild();
    while(!svgNode.isNull())
    {
        QDomElement svgChild = svgNode.toElement();
        if(!svgChild.isNull())
        {
            d->helper->parseCommonAttributes(svgNode);
            d->helper->handleTags(svgChild, true);
        }

        svgNode = svgNode.nextSibling();

        // Reset matrix
        d->painter->setWorldMatrix(new QWMatrix(initialMatrix));
    }

    d->painter->finish();

    return true;
}

KSVGIconPainter *KSVGIconEngine::painter()
{
    return d->painter;
}

QImage *KSVGIconEngine::image()
{
    return d->painter->image();
}

double KSVGIconEngine::width()
{
    return d->width;
}

double KSVGIconEngine::height()
{
    return d->height;
}

// vim:ts=4:noet

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