vkopainter.cpp

/* This file is part of the KDE project.
   Copyright (C) 2001, 2002, 2003 The Karbon Developers
 
   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.
*/
 
// kopainter/libart wrapper
 
#include "vkopainter.h"
#include "vstroke.h"
#include "vfill.h"
#include "vcolor.h"
#include "vpattern.h"
 
#include <tqpaintdevice.h>
#include <tqpixmap.h>
#include <tqpointarray.h>
#include <tqimage.h>
 
#include "libart_lgpl/art_vpath.h"
#include <libart_lgpl/art_bpath.h>
#include <libart_lgpl/art_vpath_bpath.h>
#include <libart_lgpl/art_svp_vpath.h>
#include <libart_lgpl/art_svp_vpath_stroke.h>
#include <libart_lgpl/art_svp.h>
#include <libart_lgpl/art_svp_ops.h>
#include <libart_lgpl/art_affine.h>
#include <libart_lgpl/art_svp_intersect.h>
#include <libart_lgpl/art_rect_svp.h>
#include <libart_lgpl/art_pathcode.h>
#include <libart_lgpl/art_vpath_dash.h>
#include "art_rgba_affine.h"
#include "art_render_misc.h"
#include <libart_lgpl/art_render_svp.h>
 
#include "art_rgb_svp.h"
#include "art_render_pattern.h"
 
#include <X11/Xlib.h>
 
#include <gdk-pixbuf-xlibrgb.h>
 
#include <kdebug.h>
#include <tdeglobal.h>
#include <kiconloader.h>
#include <math.h>
 
#include <KoPoint.h>
#include <KoRect.h>
#include <karbon_factory.h>
#include <karbon_resourceserver.h>
 
 
#define INITIAL_ALLOC   300
#define ALLOC_INCREMENT 100
 
VKoPainter::VKoPainter( TQPaintDevice *target, unsigned int w, unsigned int h, bool bDrawNodes )
: VPainter( target, w, h ), m_target( target ), m_bDrawNodes( bDrawNodes )
{
    //kdDebug(38000) << "w : " << w << endl;
    //kdDebug(38000) << "h : " << h << endl;
    m_width = w;//( w > 0 ) ? w : target->width();
    m_height= h;//( h > 0 ) ? h : target->height();
    m_buffer = 0L;
    m_path = 0L;
    m_index = 0;
    resize( m_width, m_height );
    clear();
    m_clipPaths.setAutoDelete( false );
 
    m_stroke = 0L;
    m_fill = 0L;
    m_fillRule = evenOdd;
 
    xlib_rgb_init_with_depth( target->x11Display(), XScreenOfDisplay( target->x11Display(),
                              target->x11Screen() ), target->x11Depth() );
 
    gc = XCreateGC( target->x11Display(), target->handle(), 0, 0 );
 
    m_zoomFactor = 1;
}
 
VKoPainter::VKoPainter( unsigned char *buffer, unsigned int w, unsigned int h, bool bDrawNodes )
: VPainter( 0L, w, h ), m_buffer( buffer ), m_bDrawNodes( bDrawNodes )
{
    //kdDebug(38000) << "w : " << w << endl;
    //kdDebug(38000) << "h : " << h << endl;
    m_target = 0L;
    m_width = w;
    m_height= h;
    m_path = 0L;
    m_index = 0;
    clear();
    m_clipPaths.setAutoDelete( false );
 
    m_stroke = 0L;
    m_fill = 0L;
 
    gc = 0L;
 
    m_zoomFactor = 1;
}
 
VKoPainter::~VKoPainter()
{
    // If we are in target mode, we created a buffer, else if we used the other ctor
    // we didn't.
    if( m_target )
        art_free( m_buffer );
 
    delete m_stroke;
    delete m_fill;
    if( m_path )
        art_free( m_path );
 
    if( gc )
        XFreeGC( m_target->x11Display(), gc );
}
 
void
VKoPainter::resize( unsigned int w, unsigned int h )
{
    if( !m_buffer || w != m_width || h != m_height )
    {
        // TODO : realloc?
        art_free( m_buffer );
        m_buffer = 0;
        m_width = w;
        m_height = h;
        if ( m_width != 0 && m_height != 0 )
            m_buffer = art_new( art_u8, m_width * m_height * 4 );
        clear();
    }
}
 
void
VKoPainter::begin()
{
}
 
void
VKoPainter::end()
{
    //xlib_draw_rgb_image( m_target->handle(), gc, 0, 0, m_width, m_height,
    //                   XLIB_RGB_DITHER_NONE, m_buffer, m_width * 4 );
    xlib_draw_rgb_32_image( m_target->handle(), gc, 0, 0, m_width, m_height,
                         XLIB_RGB_DITHER_NONE, m_buffer, m_width * 4 );
    /*xlib_draw_rgb_image( pix.handle(), gc, 0, 0, m_width, m_height,
                         XLIB_RGB_DITHER_NONE, m_buffer, m_width * 3 );
    bitBlt( m_target, 0, 0, &pix, 0, 0, m_width, m_height );*/
}
 
void
VKoPainter::blit( const KoRect &r )
{
    //kdDebug(38000) << "m_width : " << m_width << endl;
    //kdDebug(38000) << "m_height : " << m_height << endl;
    int x       = KMAX( 0, int( r.x() ) );
    int y       = KMAX( 0, int( r.y() ) );
    int width   = KMIN( m_width,    (unsigned int)KMAX( 0, int( r.x() + r.width() ) ) );
    int height  = KMIN( m_height,   (unsigned int)KMAX( 0, int( r.y() + r.height() ) ) );
    xlib_draw_rgb_32_image( m_target->handle(), gc, x, y, width - x, height - y,
                            XLIB_RGB_DITHER_NONE, m_buffer + (x * 4) + (y * m_width * 4), m_width * 4 );
}
 
void
VKoPainter::clear()
{
    if( m_buffer )
        memset( m_buffer, tqRgba( 255, 255, 255, 255 ), m_width * m_height * 4 );
}
 
void
VKoPainter::clear( const TQColor &c )
{
    if( m_buffer )
        memset( m_buffer, c.rgb(), m_width * m_height * 4 );
}
 
void
VKoPainter::clear( const KoRect &r, const TQColor &c )
{
    unsigned int color = c.rgb();
    int x       = KMAX( 0, int( r.x() ) );
    int y       = KMAX( 0, int( r.y() ) );
    int width   = KMIN( m_width,    (unsigned int)KMAX( 0, int( r.x() + r.width() ) ) );
    int height  = KMIN( m_height,   (unsigned int)KMAX( 0, int( r.y() + r.height() ) ) );
    if( m_buffer )
    {
        for( int i = y;i < height;i++)
            memset( m_buffer + int( x * 4) + int( i * ( m_width * 4 ) ),
                    tqRgba( tqRed( color ), tqGreen( color ), tqBlue( color ), 100 ), int( width * 4 ) );
    }
}
 
void
VKoPainter::setWorldMatrix( const TQWMatrix &mat )
{
    m_matrix = mat;
}
 
void
VKoPainter::setZoomFactor( double zoomFactor )
{
    m_zoomFactor = zoomFactor;
}
 
void
VKoPainter::ensureSpace( unsigned int newindex )
{
    if( m_index == 0 )
    {
        if( !m_path )
            m_path = art_new( ArtBpath, INITIAL_ALLOC );
        m_alloccount = INITIAL_ALLOC;
    }
    else if( newindex > m_alloccount )
    {
        m_alloccount += ALLOC_INCREMENT;
        m_path = art_renew( m_path, ArtBpath, m_alloccount );
    }
}
 
void 
VKoPainter::moveTo( const KoPoint &p )
{
    ensureSpace( m_index + 1 );
 
    m_path[ m_index ].code = ART_MOVETO;
 
    m_path[ m_index ].x3 = p.x() * m_zoomFactor;
    m_path[ m_index ].y3 = p.y() * m_zoomFactor;
 
    m_index++;
}
 
void 
VKoPainter::lineTo( const KoPoint &p )
{
    ensureSpace( m_index + 1 );
 
    m_path[ m_index ].code = ART_LINETO;
    m_path[ m_index ].x3    = p.x() * m_zoomFactor;
    m_path[ m_index ].y3    = p.y() * m_zoomFactor;
 
    m_index++;
}
 
void
VKoPainter::curveTo( const KoPoint &p1, const KoPoint &p2, const KoPoint &p3 )
{
    ensureSpace( m_index + 1 );
 
    m_path[ m_index ].code = ART_CURVETO;
    m_path[ m_index ].x1    = p1.x() * m_zoomFactor;
    m_path[ m_index ].y1    = p1.y() * m_zoomFactor;
    m_path[ m_index ].x2    = p2.x() * m_zoomFactor;
    m_path[ m_index ].y2    = p2.y() * m_zoomFactor;
    m_path[ m_index ].x3    = p3.x() * m_zoomFactor;
    m_path[ m_index ].y3    = p3.y() * m_zoomFactor;
 
    m_index++;
}
 
void
VKoPainter::newPath()
{
    m_index = 0;
}
 
void
VKoPainter::setFillRule( VFillRule fillRule )
{
    m_fillRule = fillRule;
}
 
void
VKoPainter::fillPath()
{
    if( m_index == 0 ) return;
 
    // find begin of last subpath
    int find = -1;
    for( int i = m_index - 1; i >= 0; i-- )
    {
        if( m_path[i].code == ART_MOVETO_OPEN || m_path[i].code == ART_MOVETO )
        {
            find = i;
            break;
        }
    }
 
    // for now, always close
    if( find != -1 && ( m_path[ find ].x3 != m_path[ m_index - 1 ].x3 ||
                        m_path[ find ].y3 != m_path[ m_index - 1 ].y3 ) )
    {
        ensureSpace( m_index + 1 );
 
        m_path[ m_index ].code = ART_LINETO;
        m_path[ m_index ].x3    = m_path[ find ].x3;
        m_path[ m_index ].y3    = m_path[ find ].y3;
 
        m_index++;
        m_path[ m_index ].code = ART_END;
    }
    else
        m_path[ m_index++ ].code = ART_END;
 
    if( m_fill && m_fill->type() != VFill::none )
    {
        ArtVpath *path = art_bez_path_to_vec( m_path , 0.25 );
        drawVPath( path );
    }
 
    m_index--;
}
 
void
VKoPainter::strokePath()
{
    if( m_index == 0 ) return;
 
    if( m_stroke && m_stroke->lineWidth() == 0 )
        return;
    if( m_path[ m_index ].code != ART_END)
        m_path[ m_index ].code = ART_END;
 
    ArtVpath *path = art_bez_path_to_vec( m_path , 0.25 );
 
    drawVPath( path );
}
 
void
VKoPainter::setClipPath()
{
    ArtVpath *path;
    path = art_bez_path_to_vec( m_path , 0.25 );
    m_clipPaths.append( art_svp_from_vpath( path ) );
    art_free( path );
}
 
void
VKoPainter::resetClipPath()
{
    art_svp_free( m_clipPaths.current() );
    m_clipPaths.remove();
}
 
void
VKoPainter::setPen( const VStroke &stroke )
{
    delete m_stroke;
    m_stroke =  new VStroke;
    *m_stroke = stroke;
}
 
void
VKoPainter::setPen( const TQColor &c )
{
    delete m_stroke;
    m_stroke = new VStroke;
 
    float r = static_cast<float>( c.red()   ) / 255.0;
    float g = static_cast<float>( c.green() ) / 255.0;
    float b = static_cast<float>( c.blue()  ) / 255.0;
 
    VColor color;
    color.set( r, g, b );
    m_stroke->setColor( color );
}
 
void
VKoPainter::setPen( TQt::PenStyle style )
{
    if( style == TQt::NoPen )
    {
        delete m_stroke;
        m_stroke = 0L;
    }
}
 
void
VKoPainter::setBrush( const TQColor &c )
{
    delete m_fill;
    m_fill = new VFill;
 
    float r = static_cast<float>( c.red()   ) / 255.0;
    float g = static_cast<float>( c.green() ) / 255.0;
    float b = static_cast<float>( c.blue()  ) / 255.0;
 
    VColor color;
    color.set( r, g, b );
    m_fill->setColor( color );
}
 
void
VKoPainter::setBrush( TQt::BrushStyle style )
{
    if( style == TQt::NoBrush )
    {
        delete m_fill;
        m_fill = 0L;
    }
}
 
void
VKoPainter::setBrush( const VFill &fill )
{
    delete m_fill;
    m_fill =  new VFill;
    *m_fill = fill;
}
 
void
VKoPainter::save()
{
}
 
void
VKoPainter::restore()
{
}
 
void
VKoPainter::setRasterOp( TQt::RasterOp  )
{
}
 
void
VKoPainter::clampToViewport( int &x0, int &y0, int &x1, int &y1 )
{
    // clamp to viewport
    x0 = kMax( x0, 0 );
    x0 = kMin( x0, int( m_width ) );
    y0 = kMax( y0, 0 );
    y0 = kMin( y0, int ( m_height ) );
    x1 = kMax( x1, 0 );
    x1 = kMin( x1, int( m_width ) );
    y1 = kMax( y1, 0 );
    y1 = kMin( y1, int( m_height ) );
}
 
void
VKoPainter::clampToViewport( const ArtSVP &svp, int &x0, int &y0, int &x1, int &y1 )
{
    // get SVP bbox
    ArtDRect bbox;
    art_drect_svp( &bbox, &svp );
    // Remove comments if we really decide for SVP bbox usage
    //m_bbox = KoRect( bbox.x0, bbox.y0, bbox.x1 - bbox.x0, bbox.y1 - bbox.y0 );
 
    // clamp to viewport
    x0 = int( bbox.x0 );
    x0 = kMax( x0, 0 );
    x0 = kMin( x0, int( m_width ) );
    y0 = int( bbox.y0 );
    y0 = kMax( y0, 0 );
    y0 = kMin( y0, int ( m_height ) );
    x1 = int( bbox.x1 ) + 1;
    x1 = kMax( x1, 0 );
    x1 = kMin( x1, int( m_width ) );
    y1 = int( bbox.y1 ) + 1;
    y1 = kMax( y1, 0 );
    y1 = kMin( y1, int( m_height ) );
}
 
void
VKoPainter::drawVPath( ArtVpath *vec )
{
    ArtSVP *strokeSvp = 0L;
    ArtSVP *fillSvp = 0L;
 
    // set up world matrix
    double affine[6];
    affine[0] = m_matrix.m11();
    affine[1] = 0;//m_matrix.m12();
    affine[2] = 0;//m_matrix.m21();
    affine[3] = m_matrix.m22();
    affine[4] = m_matrix.dx();
    affine[5] = m_matrix.dy();
    ArtVpath *temp = art_vpath_affine_transform( vec, affine );
    art_free( vec );
    vec = temp;
 
    int af = 0;
    int as = 0;
    art_u32 fillColor = 0;
 
    // filling
    TQColor color;
    if( m_fill && m_fill->type() != VFill::none )
    {
        color = m_fill->color();
        af = tqRound( 255 * m_fill->color().opacity() );
        fillColor = ( 0 << 24 ) | ( color.blue() << 16 ) | ( color.green() << 8 ) | color.red();
 
        ArtSvpWriter *swr;
        ArtSVP *temp;
        temp = art_svp_from_vpath( vec );
 
        if( m_fillRule == evenOdd )
            swr = art_svp_writer_rewind_new( ART_WIND_RULE_ODDEVEN );
        else
            swr = art_svp_writer_rewind_new( ART_WIND_RULE_NONZERO );
 
        art_svp_intersector( temp, swr );
        fillSvp = art_svp_writer_rewind_reap( swr );
 
        art_svp_free( temp );
    }
 
    art_u32 strokeColor = 0;
    // stroke
    if( m_stroke && m_stroke->type() != VStroke::none )
    {
        ArtPathStrokeCapType capStyle = ART_PATH_STROKE_CAP_BUTT;
        ArtPathStrokeJoinType joinStyle = ART_PATH_STROKE_JOIN_MITER;
        // TODO : non rgb support ?
 
        color = m_stroke->color();
        as = tqRound( 255 * m_stroke->color().opacity() );
        strokeColor = ( 0 << 24 ) | ( color.blue() << 16 ) | ( color.green() << 8 ) | color.red();
 
        double ratio = m_zoomFactor;//sqrt(pow(affine[0], 2) + pow(affine[3], 2)) / sqrt(2);
        if( m_stroke->dashPattern().array().count() > 0 )
        {
            // there are dashes to be rendered
            ArtVpathDash dash;
            dash.offset = m_stroke->dashPattern().offset() * ratio;
            dash.n_dash = m_stroke->dashPattern().array().count();
            double *dashes = new double[ dash.n_dash ];
            for( int i = 0; i < dash.n_dash; i++ )
                dashes[i] = m_stroke->dashPattern().array()[i] * ratio;
 
            dash.dash = dashes;
            // get the dashed VPath and use that for the stroke render operation
            ArtVpath *vec2 = art_vpath_dash( vec, &dash );
            art_free( vec );
 
            vec = vec2;
            delete [] dashes;
        }
        // caps translation karbon -> art
        if( m_stroke->lineCap() == VStroke::capRound )
            capStyle = ART_PATH_STROKE_CAP_ROUND;
        else if( m_stroke->lineCap() == VStroke::capSquare )
            capStyle = ART_PATH_STROKE_CAP_SQUARE;
 
        // join translation karbon -> art
        if( m_stroke->lineJoin() == VStroke::joinRound )
            joinStyle = ART_PATH_STROKE_JOIN_ROUND;
        else if( m_stroke->lineJoin() == VStroke::joinBevel )
            joinStyle = ART_PATH_STROKE_JOIN_BEVEL;
 
        // zoom stroke width;
        strokeSvp = art_svp_vpath_stroke( vec, joinStyle, capStyle, ratio * m_stroke->lineWidth(), m_stroke->miterLimit(), 0.25 );
    }
 
    int x0, y0, x1, y1;
 
    // render the svp to the buffer
    if( strokeSvp )
    {
        if( m_stroke && m_stroke->type() == VStroke::grad )
            applyGradient( strokeSvp, false );
        else if( m_stroke && m_stroke->type() == VStroke::patt )
            applyPattern( strokeSvp, false );
        else
        {
            clampToViewport( *strokeSvp, x0, y0, x1, y1 );
            if( x0 != x1 && y0 != y1 )
                art_rgb_svp_alpha_( strokeSvp, x0, y0, x1, y1, strokeColor, as, m_buffer + x0 * 4 + y0 * m_width * 4, m_width * 4, 0 );
        }
        art_svp_free( strokeSvp );
    }
 
    if( fillSvp )
    {
        if( m_fill && m_fill->type() == VFill::grad )
            applyGradient( fillSvp, true );
        else if( m_fill && m_fill->type() == VFill::patt )
            applyPattern( fillSvp, true );
        else
        {
            clampToViewport( *fillSvp, x0, y0, x1, y1 );
            if( x0 != x1 && y0 != y1 )
                art_rgb_svp_alpha_( fillSvp, x0, y0, x1, y1, fillColor, af, m_buffer + x0 * 4 + y0 * m_width * 4, m_width * 4, 0 );
        }
        art_svp_free( fillSvp );
    }
 
    //delete m_stroke;
    //m_stroke = 0L;
    //delete m_fill;
    //m_fill = 0L;
 
    art_free( vec );
}
 
void
VKoPainter::applyPattern( ArtSVP *svp, bool fill )
{
    if(!svp) {
        return;
    }
 
    int x0, y0, x1, y1;
    clampToViewport( *svp, x0, y0, x1, y1 );
 
    ArtRender *render = 0L;
 
    VPattern pat = fill ? m_fill->pattern() : m_stroke->pattern();
    if( !pat.isValid() ) {
        pat.load( TDEGlobal::iconLoader()->iconPath( "karbon.png", -TDEIcon::SizeMedium ) ); }
        if( !pat.isValid() ) {
            pat = *(dynamic_cast<VPattern *>(KarbonFactory::rServer()->patterns().getFirst() )) ;}
 
    ArtPattern *pattern = art_new( ArtPattern, 1 );
 
    double dx = ( pat.vector().x() - pat.origin().x() ) * m_zoomFactor;
    double dy = ( pat.vector().y() - pat.origin().y() ) * m_zoomFactor;
 
    pattern->twidth = pat.tileWidth();
    pattern->theight = pat.tileHeight();
    pattern->buffer = pat.pixels();
    pattern->opacity = fill ? short( m_fill->color().opacity() * 255.0 ) : short( m_stroke->color().opacity() * 255.0 );
    pattern->angle = atan2( -dy, dx );
 
    if( x0 != x1 && y0 != y1 )
    {
        render = art_render_new( x0, y0, x1, y1, m_buffer + 4 * int(x0) + m_width * 4 * int(y0), m_width * 4, 3, 8, ART_ALPHA_PREMUL, 0 );
        art_render_svp( render, svp );
        art_render_pattern( render, pattern, ART_FILTER_HYPER );
    }
 
    if( render )
        art_render_invoke( render );
    art_free( pattern );
}
 
void
VKoPainter::applyGradient( ArtSVP *svp, bool fill )
{
    int x0, y0, x1, y1;
    clampToViewport( *svp, x0, y0, x1, y1 );
 
    ArtRender *render = 0L;
 
    VGradient gradient = fill ? m_fill->gradient() : m_stroke->gradient();
    float opa = fill ? m_fill->color().opacity() : m_stroke->color().opacity();
 
    if( gradient.type() == VGradient::linear )
    {
        ArtGradientLinear *linear = art_new( ArtGradientLinear, 1 );
 
        // TODO : make variable
        if( gradient.repeatMethod() == VGradient::none )
            linear->spread = ART_GRADIENT_PAD;
        else if( gradient.repeatMethod() == VGradient::repeat )
            linear->spread = ART_GRADIENT_REPEAT;
        else if( gradient.repeatMethod() == VGradient::reflect )
            linear->spread = ART_GRADIENT_REFLECT;
 
        double _x1 = gradient.origin().x();
        double _x2 = gradient.vector().x();
        double _y2 = gradient.origin().y();
        double _y1 = gradient.vector().y();
 
        double dx = ( _x2 - _x1 ) * m_zoomFactor;
        _y1 = m_matrix.m22() * _y1 + m_matrix.dy() / m_zoomFactor;
        _y2 = m_matrix.m22() * _y2 + m_matrix.dy() / m_zoomFactor;
        double dy = ( _y1 - _y2 ) * m_zoomFactor;
        double scale = 1.0 / ( dx * dx + dy * dy );
 
        linear->a = dx * scale;
        linear->b = dy * scale;
        linear->c = -( ( _x1 * m_zoomFactor + m_matrix.dx() ) * linear->a +
                       ( _y2 * m_zoomFactor ) * linear->b );
 
        // get stop array
        int offsets = -1;
        linear->stops = buildStopArray( gradient, offsets );
        linear->n_stops = offsets;
 
        if( x0 != x1 && y0 != y1 && offsets >= 0 )
        {
            render = art_render_new( x0, y0, x1, y1, m_buffer + 4 * int(x0) + m_width * 4 * int(y0), m_width * 4, 3, 8, ART_ALPHA_PREMUL, 0 );
            int opacity = int( opa * 255.0 );
            art_render_svp( render, svp );
            art_render_mask_solid (render, (opacity << 8) + opacity + (opacity >> 7));
            art_karbon_render_gradient_linear( render, linear, ART_FILTER_NEAREST );
            art_render_invoke( render );
        }
        art_free( linear->stops );
        art_free( linear );
    }
    else if( gradient.type() == VGradient::radial )
    {
        ArtGradientRadial *radial = art_new( ArtGradientRadial, 1 );
 
        // TODO : make variable
        if( gradient.repeatMethod() == VGradient::none )
            radial->spread = ART_GRADIENT_PAD;
        else if( gradient.repeatMethod() == VGradient::repeat )
            radial->spread = ART_GRADIENT_REPEAT;
        else if( gradient.repeatMethod() == VGradient::reflect )
            radial->spread = ART_GRADIENT_REFLECT;
 
        radial->affine[0] = m_matrix.m11();
        radial->affine[1] = m_matrix.m12();
        radial->affine[2] = m_matrix.m21();
        radial->affine[3] = m_matrix.m22();
        radial->affine[4] = m_matrix.dx();
        radial->affine[5] = m_matrix.dy();
 
        double cx = gradient.origin().x() * m_zoomFactor;
        double cy = gradient.origin().y() * m_zoomFactor;
        double fx = gradient.focalPoint().x() * m_zoomFactor;
        double fy = gradient.focalPoint().y() * m_zoomFactor;
        double r = sqrt( pow( gradient.vector().x() - gradient.origin().x(), 2 ) +
                         pow( gradient.vector().y() - gradient.origin().y(), 2 ) );
        r *= m_zoomFactor;
 
        radial->fx = (fx - cx) / r;
        radial->fy = (fy - cy) / r;
 
        double aff1[6], aff2[6];
        art_affine_scale( aff1, r, r);
        art_affine_translate( aff2, cx, cy );
        art_affine_multiply( aff1, aff1, aff2 );
        art_affine_multiply( aff1, aff1, radial->affine );
        art_affine_invert( radial->affine, aff1 );
 
        // get stop array
        int offsets = -1;
        radial->stops = buildStopArray( gradient, offsets );
        radial->n_stops = offsets;
 
        if( x0 != x1 && y0 != y1 && offsets >= 0 )
        {
            render = art_render_new( x0, y0, x1, y1, m_buffer + 4 * x0 + m_width * 4 * y0, m_width * 4, 3, 8, ART_ALPHA_PREMUL, 0 );
            int opacity = int( opa * 255.0 );
            art_render_svp( render, svp );
            art_render_mask_solid (render, (opacity << 8) + opacity + (opacity >> 7));
            art_karbon_render_gradient_radial( render, radial, ART_FILTER_NEAREST );
            art_render_invoke( render );
        }
        art_free( radial->stops );
        art_free( radial );
    }
    else if( gradient.type() == VGradient::conic )
    {
        ArtGradientConical *conical = art_new( ArtGradientConical, 1 );
 
        // TODO : make variable
        if( gradient.repeatMethod() == VGradient::none )
            conical->spread = ART_GRADIENT_PAD;
        else if( gradient.repeatMethod() == VGradient::repeat )
            conical->spread = ART_GRADIENT_REPEAT;
        else if( gradient.repeatMethod() == VGradient::reflect )
            conical->spread = ART_GRADIENT_REFLECT;
 
        double cx = gradient.origin().x() * m_zoomFactor;
        cx = m_matrix.m11() * cx + m_matrix.dx();
        double cy = gradient.origin().y() * m_zoomFactor;
        cy = m_matrix.m22() * cy + m_matrix.dy();
        double r = sqrt( pow( gradient.vector().x() - gradient.origin().x(), 2 ) +
                         pow( gradient.vector().y() - gradient.origin().y(), 2 ) );
        r *= m_zoomFactor;
 
        conical->cx = cx;
        conical->cy = cy;
        conical->r  = r;
 
        // get stop array
        int offsets = -1;
        conical->stops = buildStopArray( gradient, offsets );
        conical->n_stops = offsets;
 
        if( x0 != x1 && y0 != y1 && offsets >= 0 )
        {
            render = art_render_new( x0, y0, x1, y1, m_buffer + 4 * x0 + m_width * 4 * y0, m_width * 4, 3, 8, ART_ALPHA_PREMUL, 0 );
            int opacity = int( opa * 255.0 );
            art_render_svp( render, svp );
            art_render_mask_solid (render, (opacity << 8) + opacity + (opacity >> 7));
            art_karbon_render_gradient_conical( render, conical, ART_FILTER_NEAREST );
            art_render_invoke( render );
        }
        art_free( conical->stops );
        art_free( conical );
    }
}
 
ArtGradientStop *
VKoPainter::buildStopArray( VGradient &gradient, int &offsets )
{
    // TODO : make this generic
    TQPtrVector<VColorStop> colorStops = gradient.colorStops();
    offsets = colorStops.count();
 
    ArtGradientStop *stopArray = art_new( ArtGradientStop, offsets * 2 - 1 );
 
    for( int offset = 0 ; offset < offsets ; offset++ )
    {
        double ramp = colorStops[ offset ]->rampPoint;
        //double mid  = colorStops[ offset ]->midPoint;
        stopArray[ offset * 2 ].offset = ramp;
 
        TQColor qStopColor = colorStops[ offset ]->color;
        int r = tqRed( qStopColor.rgb() );
        int g = tqGreen( qStopColor.rgb() );
        int b = tqBlue( qStopColor.rgb() );
        art_u32 rgba = (r << 24) | (g << 16) | (b << 8) | tqAlpha(qStopColor.rgb());
        /* convert from separated to premultiplied alpha */
        int a = int( colorStops[ offset]->color.opacity() * 255.0 );
        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;
        stopArray[ offset * 2 ].color[ 0 ] = ART_PIX_MAX_FROM_8(r);
        stopArray[ offset * 2 ].color[ 1 ] = ART_PIX_MAX_FROM_8(g);
        stopArray[ offset * 2 ].color[ 2 ] = ART_PIX_MAX_FROM_8(b);
        stopArray[ offset * 2 ].color[ 3 ] = ART_PIX_MAX_FROM_8(a);
 
        if( offset + 1 != offsets )
        {
            stopArray[ offset * 2 + 1 ].offset = ramp + ( colorStops[ offset + 1 ]->rampPoint - ramp ) * colorStops[ offset ]->midPoint;
 
            TQColor qStopColor2 = colorStops[ offset + 1 ]->color;
            rgba = int(r + ((tqRed(qStopColor2.rgb()) - r)) * 0.5) << 24 |
                        int(g + ((tqGreen(qStopColor2.rgb()) - g)) * 0.5) << 16 |
                        int(b + ((tqBlue(qStopColor2.rgb()) - b)) * 0.5) << 8 |
                        tqAlpha(qStopColor2.rgb());
            /* convert from separated to premultiplied alpha */
            int a = int( colorStops[ offset]->color.opacity() * 255.0 );
            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;
            stopArray[ offset * 2 + 1 ].color[ 0 ] = ART_PIX_MAX_FROM_8(r);
            stopArray[ offset * 2 + 1 ].color[ 1 ] = ART_PIX_MAX_FROM_8(g);
            stopArray[ offset * 2 + 1 ].color[ 2 ] = ART_PIX_MAX_FROM_8(b);
            stopArray[ offset * 2 + 1 ].color[ 3 ] = ART_PIX_MAX_FROM_8(a);
        }
    }
 
    offsets = offsets * 2 - 1;
    return stopArray;
}
 
void
VKoPainter::drawNode( const KoPoint& p, int width )
{
    if( !m_bDrawNodes ) return;
 
    KoPoint _p( m_matrix.map( TQPoint( int( p.x() * m_zoomFactor ), int( p.y() * m_zoomFactor ) ) ) );
    int x1 = int( _p.x() - width );
    int x2 = int( _p.x() + width );
    int y1 = int( _p.y() - width );
    int y2 = int( _p.y() + width );
 
    clampToViewport( x1, y1, x2, y2 );
 
    int baseindex = 4 * x1 + ( m_width * 4 * y1 );
 
    TQColor color = m_fill->color();
    for( int i = 0; i < y2 - y1; i++ )
    {
        for( int j = 0; j < x2 - x1; j++ )
        {
            m_buffer[ baseindex + 4 * j + ( m_width * 4 * i ) ] = color.red();
            m_buffer[ baseindex + 4 * j + ( m_width * 4 * i ) + 1 ] = color.green();
            m_buffer[ baseindex + 4 * j + ( m_width * 4 * i ) + 2 ] = color.blue();
            m_buffer[ baseindex + 4 * j + ( m_width * 4 * i ) + 3 ] = 0xFF;
        }
    }
}
 
void
VKoPainter::drawImage( const TQImage &image, const TQWMatrix &affine )
{
    // set up world matrix
    double affineresult[6];
 
    affineresult[0] = affine.m11() * m_matrix.m11() * m_zoomFactor + affine.m12() * m_matrix.m21();
    affineresult[1] = (affine.m11() * m_matrix.m12() + affine.m12() * m_matrix.m22() ) * m_zoomFactor;
    affineresult[2] = (affine.m21() * m_matrix.m11() + affine.m22() * m_matrix.m21() ) * m_zoomFactor;
    affineresult[3] = affine.m22() * m_matrix.m22() * m_zoomFactor + affine.m21() * m_matrix.m12();
    affineresult[4] = m_matrix.dx() + affine.dx() * m_zoomFactor;
    affineresult[5] = m_matrix.dy() - affine.dy() * m_zoomFactor;
    
    //art_affine_scale( affineresult, m_zoomFactor, m_zoomFactor);
    /*kdDebug(38000) << "affineresult[0] : " << affineresult[0] << endl;
    kdDebug(38000) << "affineresult[1] : " << affineresult[1] << endl;
    kdDebug(38000) << "affineresult[2] : " << affineresult[2] << endl;
    kdDebug(38000) << "affineresult[3] : " << affineresult[3] << endl;
    kdDebug(38000) << "affineresult[4] : " << affineresult[4] << endl;
    kdDebug(38000) << "affineresult[5] : " << affineresult[5] << endl;
    kdDebug(38000) << "m_matrix.dx() : " << m_matrix.dx() << endl;
    kdDebug(38000) << "affine.dx() : " << affine.dx() << endl;
    kdDebug(38000) << "image.height() : " << image.height() << endl;*/
    art_rgba_affine( m_buffer, 0, 0, m_width, m_height, m_width * 4,
                     image.bits(), image.width(), image.height(), image.width() * 4,
                     affineresult, ART_FILTER_NEAREST, 0L );
}
 
void
VKoPainter::drawRect( const KoRect &r )
{
    newPath();
    moveTo( r.topLeft() );
    lineTo( r.topRight() );
    lineTo( r.bottomRight() );
    lineTo( r.bottomLeft() );
    lineTo( r.topLeft() );
    fillPath();
    strokePath();
}
 
void
VKoPainter::drawRect( double x, double y, double w, double h )
{
    drawRect( KoRect( x, y, w, h ) );
}