include/cinder/svg/SvgGl.h

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/*
 Copyright (c) 2012, The Cinder Project
 All rights reserved.
 
 This code is designed for use with the Cinder C++ library, http://libcinder.org

 Redistribution and use in source and binary forms, with or without modification, are permitted provided that
 the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this list of conditions and
    the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
    the following disclaimer in the documentation and/or other materials provided with the distribution.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.
*/


#pragma once

#include "cinder/gl/gl.h"
#include "cinder/gl/Texture.h"
#include "cinder/svg/Svg.h"
#include "cinder/Triangulate.h"

namespace cinder {

class SvgRendererGl : public svg::Renderer {
  public:
    SvgRendererGl() : svg::Renderer() { 
        mFillStack.push_back( svg::Paint( Color::black() ) );
        mStrokeStack.push_back( svg::Paint() );
        mFillOpacityStack.push_back( 1.0f );
        mStrokeOpacityStack.push_back( 1.0f );
        mStrokeWidthStack.push_back( 1.0f );
        glLineWidth( 1.0f );
        glMatrixMode( GL_MODELVIEW );
        glPushMatrix();
        mFillRuleStack.push_back( svg::FILL_RULE_NONZERO );
    }
    
    ~SvgRendererGl() {
        glPopMatrix();
    }
  
    void    pushGroup( const svg::Group &group, float opacity ) {}
    
    void    drawPath( const svg::Path &path ) {
        if( ! mFillStack.back().isNone() ) {
            gl::color( getCurFillColor() );
            Triangulator::Winding winding = ( mFillRuleStack.back() == svg::FILL_RULE_NONZERO ) ? Triangulator::WINDING_NONZERO : Triangulator::WINDING_ODD;
            gl::draw( Triangulator( path.getShape2d() ).calcMesh( winding ) );
        }
        if( ! mStrokeStack.back().isNone() ) {
            gl::color( getCurStrokeColor() );
            gl::draw( path.getShape2d() );
        }
    }

    void    drawPolygon( const svg::Polygon &polygon ) {
        if( ! mFillStack.back().isNone() ) {
            gl::color( getCurFillColor() );
            Triangulator::Winding winding = ( mFillRuleStack.back() == svg::FILL_RULE_NONZERO ) ? Triangulator::WINDING_NONZERO : Triangulator::WINDING_ODD;
            gl::draw( Triangulator( polygon.getPolyLine() ).calcMesh( winding ) );

        }
        if( ! mStrokeStack.back().isNone() ) {
            gl::color( getCurStrokeColor() );
            gl::draw( polygon.getPolyLine() );
        }
    }

    void    drawPolyline( const svg::Polyline &polyline ) {
        if( ! mFillStack.back().isNone() ) {
            gl::color( getCurFillColor() );
            Triangulator::Winding winding = ( mFillRuleStack.back() == svg::FILL_RULE_NONZERO ) ? Triangulator::WINDING_NONZERO : Triangulator::WINDING_ODD;
            gl::draw( Triangulator( polyline.getPolyLine() ).calcMesh( winding ) );

        }
        if( ! mStrokeStack.back().isNone() ) {
            gl::color( getCurStrokeColor() );
            gl::draw( polyline.getPolyLine() );
        }
    }

    void    drawLine( const svg::Line &line ) {
        if( ! mStrokeStack.back().isNone() ) {
            gl::color( getCurStrokeColor() );
            gl::drawLine( line.getPoint1(), line.getPoint2() );
        }
    }

    void    drawRect( const svg::Rect &rect ) {
        if( ! mFillStack.back().isNone() ) {
            gl::color( getCurFillColor() );
            gl::drawSolidRect( rect.getRect() );
        }
        if( ! mStrokeStack.back().isNone() ) {
            gl::color( getCurStrokeColor() );
            gl::drawStrokedRect( rect.getRect() );
        }
    }

    void    drawCircle( const svg::Circle &circle ) {
        if( ! mFillStack.back().isNone() ) {
            gl::color( getCurFillColor() );
            gl::drawSolidCircle( circle.getCenter(), circle.getRadius() );
        }
        if( ! mStrokeStack.back().isNone() ) {
            gl::color( getCurStrokeColor() );
            gl::drawStrokedCircle( circle.getCenter(), circle.getRadius() );
        }
    }

    void    drawEllipse( const svg::Ellipse &ellipse ) {
        if( ! mFillStack.back().isNone() ) {
            gl::color( getCurFillColor() );
            gl::drawSolidEllipse( ellipse.getCenter(), ellipse.getRadiusX(), ellipse.getRadiusY() );
        }
        if( ! mStrokeStack.back().isNone() ) {
            gl::color( getCurStrokeColor() );
            gl::drawStrokedEllipse( ellipse.getCenter(), ellipse.getRadiusX(), ellipse.getRadiusY() );
        }
    }   
    
    void    drawImage( const Surface8u &surface, const Rectf &drawRect ) {
        gl::color( Color::white() );
        gl::draw( gl::Texture( surface ), drawRect );
    }

    void    drawTextSpan( const svg::TextSpan &span ) {
    
    }

    void    popGroup() {}

    void    pushMatrix( const MatrixAffine2f &m ) {
        glPushMatrix();
        glMultMatrixf( Matrix44f( m ) );
    }
    void    popMatrix() {
        glPopMatrix();
    }
    
    void    pushFill( const svg::Paint &paint ) { mFillStack.push_back( paint ); }
    void    popFill() { mFillStack.pop_back(); }
    void    pushStroke( const svg::Paint &paint ) { mStrokeStack.push_back( paint ); }
    void    popStroke() { mStrokeStack.pop_back(); }
    void    pushFillOpacity( float opacity ) { mFillOpacityStack.push_back( opacity ); }
    void    popFillOpacity() { mFillOpacityStack.pop_back(); }
    void    pushStrokeOpacity( float opacity ) { mStrokeOpacityStack.push_back( opacity ); }
    void    popStrokeOpacity() { mStrokeOpacityStack.pop_back(); }

    ColorA  getCurFillColor() { ColorA result( mFillStack.back().getColor() ); result.a = mFillOpacityStack.back(); return result; }
    ColorA  getCurStrokeColor() { ColorA result( mStrokeStack.back().getColor() ); result.a = mStrokeOpacityStack.back(); return result; }


    void    pushStrokeWidth( float width ) { mStrokeWidthStack.push_back( width ); glLineWidth( width ); }
    void    popStrokeWidth() { mStrokeWidthStack.pop_back(); glLineWidth( mStrokeWidthStack.back() ); }
    void    pushFillRule( svg::FillRule rule ) { mFillRuleStack.push_back( rule ); }
    void    popFillRule() { mFillRuleStack.pop_back(); }    


    std::vector<svg::Paint>     mFillStack, mStrokeStack;
    std::vector<float>          mFillOpacityStack, mStrokeOpacityStack;
    std::vector<float>          mStrokeWidthStack;
    std::vector<svg::FillRule>  mFillRuleStack;
};

namespace gl {
inline void draw( const svg::Doc &svg )
{
    SvgRendererGl renderGl;
    svg.render( renderGl );
}
} // namespace gl

} // namespace cinder