extension/internal/wpg-input.cpp

	wpg-input.cpp revision 51dcbfb8ad170dd928a3abbd436899181d12971d
/* libwpg
 * Copyright (C) 2006 Ariya Hidayat (ariya@kde.org)
 * Copyright (C) 2005 Fridrich Strba (fridrich.strba@bluewin.ch)
 *
 * 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; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * For further information visit http://libwpg.sourceforge.net
 */

/* "This product is not manufactured, approved, or supported by
 * Corel Corporation or Corel Corporation Limited."
 */

#include <stdio.h>

#include "libwpg/libwpg.h"
#include "libwpg/WPGStreamImplementation.h"

using namespace libwpg;

class InkscapePainter : public libwpg::WPGPaintInterface {
public:
    InkscapePainter();

    void startDocument(double imageWidth, double imageHeight);
    void endDocument();
    void startLayer(unsigned int id);
    void endLayer(unsigned int id);

    void setPen(const WPGPen& pen);
    void setBrush(const WPGBrush& brush);
    void setFillRule(FillRule rule);

    void drawRectangle(const WPGRect& rect, double rx, double ry);
    void drawEllipse(const WPGPoint& center, double rx, double ry);
    void drawPolygon(const WPGPointArray& vertices);
    void drawPath(const WPGPath& path);

private:
    WPGPen m_pen;
    WPGBrush m_brush;
    FillRule m_fillRule;
    int m_gradientIndex;
    void writeStyle();
};

InkscapePainter::InkscapePainter(): m_fillRule(AlternatingFill), m_gradientIndex(1)
{
}

void InkscapePainter::startDocument(double width, double height)
{
    printf("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n");
    printf("<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"");
    printf(" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n");

    printf("<!-- Created with wpg2svg/libwpg %s -->\n", LIBWPG_VERSION_STRING);

    printf("<svg version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\" ");
    printf("xmlns:xlink=\"http://www.w3.org/1999/xlink\" ");
    printf("width=\"%g\" height=\"%f\" >\n", 72*width, 72*height);

    m_gradientIndex = 1;
}

void InkscapePainter::endDocument()
{
    printf("</svg>\n");
}

void InkscapePainter::setPen(const WPGPen& pen)
{
    m_pen = pen;
}

void InkscapePainter::setBrush(const WPGBrush& brush)
{
    m_brush = brush;

    if(m_brush.style == WPGBrush::Gradient)
    {
        double angle = m_brush.gradient.angle();

        printf("<defs>\n");
        printf("  <linearGradient id=\"grad%d\" >\n", m_gradientIndex++);
        for(unsigned c = 0; c < m_brush.gradient.count(); c++)
        {
            // round to nearest percentage
            int ofs = (int)(100.0*m_brush.gradient.stopOffset(c)+0.5);

            WPGColor color = m_brush.gradient.stopColor(c);
            printf("    <stop offset=\"%d%%\" stop-color=\"#%02x%02x%02x\" />\n",
                ofs, color.red, color.green, color.blue);
        }
        printf("  </linearGradient>\n");

        // not a simple horizontal gradient
        if(angle != -90.0)
        {
            printf("  <linearGradient xlink:href=\"#grad%d\"", m_gradientIndex-1);
            printf(" id=\"grad%d\" ", m_gradientIndex++);
            printf("x1=\"0\" y1=\"0\" x2=\"0\" y2=\"1\" ");
            printf("gradientTransform=\"rotate(%f)\" ", angle);
            printf("gradientUnits=\"objectBoundingBox\" >\n");
            printf("  </linearGradient>\n");
        }

        printf("</defs>\n");
    }
}

void InkscapePainter::setFillRule(FillRule rule)
{
    m_fillRule = rule;
}

void InkscapePainter::startLayer(unsigned int id)
{
    printf("<g id=\"Layer%d\" >\n", id);
}

void InkscapePainter::endLayer(unsigned int)
{
    printf("</g>\n");
}

void InkscapePainter::drawRectangle(const WPGRect& rect, double rx, double ry)
{
    printf("<rect ");
    printf("x=\"%f\" y=\"%f\" ", 72*rect.x1, 72*rect.y1);
    printf("width=\"%f\" height=\"%f\" ", 72*rect.width(), 72*rect.height());
    if((rx !=0) || (ry !=0))
        printf("rx=\"%f\" ry=\"%f\" ", 72*rx, 72*ry);
    writeStyle();
    printf("/>\n");
}

void InkscapePainter::drawEllipse(const WPGPoint& center, double rx, double ry)
{
    printf("<ellipse ");
    printf("cx=\"%f\" cy=\"%f\" ", 72*center.x, 72*center.y);
    printf("rx=\"%f\" ry=\"%f\" ", 72*rx, 72*ry);
    writeStyle();
    printf("/>\n");
}

void InkscapePainter::drawPolygon(const WPGPointArray& vertices)
{
    if(vertices.count() < 2)
        return;

    if(vertices.count() == 2)
    {
        const WPGPoint& p1 = vertices[0];
        const WPGPoint& p2 = vertices[1];
        printf("<line ");
        printf("x1=\"%f\"  y1=\"%f\" ", 72*p1.x, 72*p1.y);
        printf("x2=\"%f\"  y2=\"%f\"\n", 72*p2.x, 72*p2.y);
        writeStyle();
        printf("/>\n");
    }
    else
    {
        printf("<polyline ");
        printf("points=\"");
        for(unsigned i = 0; i < vertices.count(); i++)
        {
            printf("%f %f", 72*vertices[i].x, 72*vertices[i].y);
            if(i < vertices.count()-1) printf(", ");
        }
        printf("\"\n");
        writeStyle();
        printf("/>\n");
    }
}

void InkscapePainter::drawPath(const WPGPath& path)
{
    printf("<path d=\"");
    for(unsigned i = 0; i < path.count(); i++)
    {
        WPGPathElement element = path.element(i);
        WPGPoint point = element.point;
        switch(element.type)
        {
            case WPGPathElement::MoveToElement:
                printf("\n M%f,%f ", 72*point.x, 72*point.y );
                break;

            case WPGPathElement::LineToElement:
                printf("\n L%f,%f ", 72*point.x, 72*point.y );
                break;

            case WPGPathElement::CurveToElement:
                printf("C");
                printf("%f,%f ", 72*element.extra1.x, 72*element.extra1.y );
                printf("%f,%f ", 72*element.extra2.x, 72*element.extra2.y );
                printf("%f,%f", 72*point.x, 72*point.y );
                break;

            default:
                break;
        }
    }
    printf("\" \n");
    writeStyle();
    printf("/>\n");
}

// create "style" attribute based on current pen and brush
void InkscapePainter::writeStyle()
{
    printf("style=\"");

    const WPGColor& color = m_pen.foreColor;
    printf("stroke-width: %f; ", 72*m_pen.width);
    if(m_pen.width > 0.0)
    {
        printf("stroke: rgb(%d,%d,%d); ", color.red, color.green, color.blue);
        if(color.alpha != 0)
            // alpha = 0 means opacity = 1.0, alpha = 256 means opacity = 0
            printf("stroke-opacity: %f; ", 1.0-(color.alpha/256.0));
    }

    if(!m_pen.solid)
    {
        printf("stroke-dasharray: ");
        for(unsigned i = 0; i < m_pen.dashArray.count(); i++)
        {
            printf("%f", 72*m_pen.dashArray.at(i)*m_pen.width);
            if(i < m_pen.dashArray.count()-1)
                printf(", ");
        }
        printf("; ");
    }

    if(m_brush.style == WPGBrush::NoBrush)
        printf("fill: none; ");

    if(m_fillRule == InkscapePainter::WindingFill)
        printf("fill-rule: nonzero; ");
    else if(m_fillRule == InkscapePainter::AlternatingFill)
        printf("fill-rule: evenodd; ");

    if(m_brush.style == WPGBrush::Gradient)
        printf("fill: url(#grad%d); ", m_gradientIndex-1);

    if(m_brush.style == WPGBrush::Solid)
        printf("fill: rgb(%d,%d,%d); ", m_brush.foreColor.red,
            m_brush.foreColor.green, m_brush.foreColor.blue);

    printf("\""); // style
}


int main(int argc, char *argv[])
{
    if (argc < 2)
    {
        printf("usage: wpg2svg <WordPerfect Graphic>\n");
        return -1;
    }

    const char* filename = argv[1];
    WPGInputStream* input = new WPGFileStream(filename);
    if (input->isOle())
    {
        WPGInputStream* olestream = input->getWPGOleStream();
        if (olestream)
        {
            delete input;
            input = olestream;
        }
    }

    if (!WPGraphics::isSupported(input))
    {
        fprintf(stderr, "ERROR: Unsupported file format (unsupported version) or file is encrypted!\n");
        return 1;
    }

    InkscapePainter painter;
    WPGraphics::parse(input, &painter);

    return 0;
}