agg/examples/polymorphic_renderer.cpp

#include <math.h>
#include <stdio.h>
#include <time.h>
#include "agg_basics.h"
#include "agg_rendering_buffer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_rasterizer_outline.h"
#include "agg_scanline_p.h"
#include "agg_path_storage.h"
#include "agg_renderer_scanline.h"
#include "platform/agg_platform_support.h"

#include "agg_pixfmt_rgb.h"
#include "agg_pixfmt_rgb_packed.h"
#include "agg_pixfmt_rgba.h"

static int pix_fmt = agg::pix_format_rgb555;
//static int pix_fmt = agg::pix_format_rgb565;
//static int pix_fmt = agg::pix_format_rgb24; 
//static int pix_fmt = agg::pix_format_bgr24; 
//static int pix_fmt = agg::pix_format_rgba32;
//static int pix_fmt = agg::pix_format_argb32;
//static int pix_fmt = agg::pix_format_abgr32;
//static int pix_fmt = agg::pix_format_bgra32;


enum flip_y_e { flip_y = true };

namespace agg
{
    //========================================================================
    class polymorphic_renderer_solid_rgba8_base
    {
    public:
        typedef srgba8       color_type;
        typedef scanline_p8 scanline_type;

        virtual ~polymorphic_renderer_solid_rgba8_base() {}

        //--------------------------------------------------------------------
        virtual void clear(const color_type& c) = 0;
        virtual void color(const color_type& c) = 0;
        virtual const color_type color() const = 0;
        virtual void prepare() = 0;
        virtual void render(const scanline_type&) = 0;
    };



    //========================================================================
    template<class PixFmt> class polymorphic_renderer_solid_rgba8_adaptor :
    public polymorphic_renderer_solid_rgba8_base
    {
    public:
        polymorphic_renderer_solid_rgba8_adaptor(rendering_buffer& rbuf) : 
            m_pixfmt(rbuf),
            m_ren_base(m_pixfmt),
            m_ren(m_ren_base)
        {}
          
        //--------------------------------------------------------------------
        virtual void clear(const color_type& c)
        {
            m_ren_base.clear(c);
        }

        virtual void color(const color_type& c)
        {
            m_ren.color(c);
        }

        virtual const color_type color() const
        {
            return m_ren.color();
        }

        virtual void prepare()
        {
            m_ren.prepare();
        }

        virtual void render(const scanline_type& sl)
        {
            m_ren.render(sl);
        }

    private:
        PixFmt                m_pixfmt;
        renderer_base<PixFmt> m_ren_base;
        renderer_scanline_aa_solid<renderer_base<PixFmt> > m_ren;
    };


}







class the_application : public agg::platform_support
{
    double m_x[3];
    double m_y[3];

public:
    the_application(int format, bool flip_y) :
        agg::platform_support((agg::pix_format_e)format, flip_y)
    {
        m_x[0] = 100; m_y[0] = 60;
        m_x[1] = 369; m_y[1] = 170;
        m_x[2] = 143; m_y[2] = 310;
    }

    virtual void on_draw()
    {
        agg::path_storage path;
        path.move_to(m_x[0], m_y[0]);
        path.line_to(m_x[1], m_y[1]);
        path.line_to(m_x[2], m_y[2]);
        path.close_polygon();

        agg::polymorphic_renderer_solid_rgba8_base* ren = 0;

        //-- Polymorphic renderer class factory
        switch(pix_fmt)
        {
        case agg::pix_format_rgb555 : ren = new agg::polymorphic_renderer_solid_rgba8_adaptor<agg::pixfmt_rgb555>(rbuf_window()); break;
        case agg::pix_format_rgb565 : ren = new agg::polymorphic_renderer_solid_rgba8_adaptor<agg::pixfmt_rgb565>(rbuf_window()); break;
        case agg::pix_format_rgb24  : ren = new agg::polymorphic_renderer_solid_rgba8_adaptor<agg::pixfmt_rgb24 >(rbuf_window()); break;
        case agg::pix_format_bgr24  : ren = new agg::polymorphic_renderer_solid_rgba8_adaptor<agg::pixfmt_bgr24 >(rbuf_window()); break;
        case agg::pix_format_rgba32 : ren = new agg::polymorphic_renderer_solid_rgba8_adaptor<agg::pixfmt_rgba32>(rbuf_window()); break;
        case agg::pix_format_argb32 : ren = new agg::polymorphic_renderer_solid_rgba8_adaptor<agg::pixfmt_argb32>(rbuf_window()); break;
        case agg::pix_format_abgr32 : ren = new agg::polymorphic_renderer_solid_rgba8_adaptor<agg::pixfmt_abgr32>(rbuf_window()); break;
        case agg::pix_format_bgra32 : ren = new agg::polymorphic_renderer_solid_rgba8_adaptor<agg::pixfmt_bgra32>(rbuf_window()); break;
        }

        agg::rasterizer_scanline_aa<> ras;
        agg::scanline_p8 sl;
        if(ren) 
        {
            ren->clear(agg::srgba8(255, 255, 255));
            ren->color(agg::srgba8(80, 30, 20));
            ras.add_path(path);
            agg::render_scanlines(ras, sl, *ren);
        }
        delete ren;
    }

};



int agg_main(int argc, char* argv[])
{
    the_application app(pix_fmt, flip_y);
    app.caption("AGG Example. Polymorphic Renderers");

    if(app.init(400, 330, agg::window_resize))
    {
        return app.run();
    }
    return 1;
}