C++ agg::rasterizer_scanline_aa类代码示例

void pathAttr::addPath<agg::rasterizer_scanline_aa<> >(agg::rasterizer_scanline_aa<>& ras,
                                                       agg::path_storage* path, 
                                                       const agg::trans_affine& tr)
{
    apply(path, tr, 1.0);
    
    if (mCommand == stroke) {
        if (mIsoWidthFlag) {
            ras.add_path(transCurvedStroked, mIndex);
        } else {
            ras.add_path(curvedStrokedTrans, mIndex);
        }
    } else {
        ras.add_path(transCurved, mIndex);
    }
}

    void draw_aliased()
    {
        pixfmt pixf(rbuf_window());
        renderer_base rb(pixf);
        renderer_bin ren_bin(rb);

        agg::path_storage path;
        

        path.move_to(m_x[0] - 200, m_y[0]);
        path.line_to(m_x[1] - 200, m_y[1]);
        path.line_to(m_x[2] - 200, m_y[2]);
        path.close_polygon();

        ren_bin.color(agg::rgba(0.1, 0.5, 0.7, m_alpha.value()));

        m_ras.gamma(agg::gamma_threshold(m_gamma.value()));
        m_ras.add_path(path);
        agg::render_scanlines(m_ras, m_sl_bin, ren_bin);

        //-- Drawing an outline with subpixel accuracy (aliased)
        //typedef agg::renderer_primitives<renderer_base> renderer_pr;
        //renderer_pr ren_pr(rb);
        //agg::rasterizer_outline<renderer_pr> ras_line(ren_pr);
        //ren_pr.line_color(agg::rgba(0.0, 0.0, 0.0));
        //ras_line.add_path(path);
    }

    void perform_rendering(VertexSource& vs)
    {
        pixfmt_type pixf(rbuf_window());

        typedef agg::pixfmt_amask_adaptor<pixfmt_type, alpha_mask_type> pixfmt_amask_type;
        typedef agg::renderer_base<pixfmt_amask_type>                   amask_ren_type;


        pixfmt_amask_type pixfa(pixf, m_alpha_mask);
        amask_ren_type rbase(pixfa);
        agg::renderer_scanline_aa_solid<amask_ren_type> ren(rbase);

        ren.color(agg::rgba(0.5, 0.0, 0, 0.5));

        start_timer();
        m_ras.reset();
        m_ras.add_path(vs);
        agg::render_scanlines(m_ras, m_sl, ren);
        double t1 = elapsed_time();


        char buf[100];
        sprintf(buf, "Render with AlphaMask: %.3fms", t1);
        draw_text(250, 5, buf);
    }

    template<class VertexSource> void generate_alpha_mask(VertexSource& vs)
    {
        unsigned cx = (unsigned)width();
        unsigned cy = (unsigned)height();

        delete [] m_alpha_buf;
        m_alpha_buf = new unsigned char[cx * cy];
        m_alpha_mask_rbuf.attach(m_alpha_buf, cx, cy, cx);

        typedef agg::renderer_base<agg::pixfmt_gray8> ren_base;
        typedef agg::renderer_scanline_aa_solid<ren_base> renderer;

        agg::pixfmt_gray8 pixf(m_alpha_mask_rbuf);
        ren_base rb(pixf);
        renderer ren(rb);

        start_timer();
        if(m_operation.cur_item() == 0)
        {
            rb.clear(agg::gray8(0));
            ren.color(agg::gray8(255));
        }
        else 
        {
            rb.clear(agg::gray8(255));
            ren.color(agg::gray8(0));
        }
        m_ras.add_path(vs);
        agg::render_scanlines(m_ras, m_sl, ren);
        double t1 = elapsed_time();

        char buf[100];
        sprintf(buf, "Generate AlphaMask: %.3fms", t1);
        draw_text(250, 20, buf);
    }

    void generate_alpha_mask(int cx, int cy)
    {
        delete [] m_alpha_buf;
        m_alpha_buf = new unsigned char[cx * cy];
        g_alpha_mask_rbuf.attach(m_alpha_buf, cx, cy, cx);

        typedef agg::renderer_base<agg::pixfmt_gray8> ren_base;
        typedef agg::renderer_scanline_aa_solid<ren_base> renderer;

        agg::pixfmt_gray8 pixf(g_alpha_mask_rbuf);
        ren_base rb(pixf);
        renderer r(rb);
        agg::scanline_p8 sl;

        rb.clear(agg::gray8(0));

        agg::ellipse ell;

        int i;
        for(i = 0; i < 10; i++)
        {
            ell.init(rand() % cx, 
                     rand() % cy, 
                     rand() % 100 + 20, 
                     rand() % 100 + 20,
                     100);

            g_rasterizer.add_path(ell);
            r.color(agg::gray8(rand() & 0xFF, rand() & 0xFF));
            agg::render_scanlines(g_rasterizer, sl, r);
        }
    }

    void draw_anti_aliased()
    {
        pixfmt pixf(rbuf_window());
        renderer_base rb(pixf);
        renderer_aa ren_aa(rb);

        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();

        ren_aa.color(agg::rgba(0.7, 0.5, 0.1, m_alpha.value()));

        m_ras.gamma(agg::gamma_power(m_gamma.value() * 2.0));
        m_ras.add_path(path);
        agg::render_scanlines(m_ras, m_sl_p8, ren_aa);
    }

void roadmap_canvas_draw_multiple_circles
        (int count, RoadMapGuiPoint *centers, int *radius, int filled,
         int fast_draw) {

   int i;

   static agg::path_storage path;

   for (i = 0; i < count; ++i) {

      int r = radius[i];

      int x = centers[i].x;
      int y = centers[i].y;

      agg::ellipse e( x, y, r, r);
      path.concat_path(e);

      if (filled) {

         ras.reset();
         ras.add_path(path);
         ren_solid.color(CurrentPen->color);
         agg::render_scanlines( ras, sl, ren_solid);

/*      } else if (fast_draw) {
         renderer_pr ren_pr(agg_renb);
         agg::rasterizer_outline<renderer_pr> ras_line(ren_pr);
         ren_pr.line_color(CurrentPen->color);
         ras_line.add_path(path);
*/
      } else {

         raso.add_path(path);
      }

      path.remove_all ();
   }
}

    //------------------------------------------------------------------------
    void generate_pattern()
    {
        unsigned size = unsigned(m_pattern_size.value());

        create_star(m_pattern_size.value() / 2.0, 
                    m_pattern_size.value() / 2.0, 
                    m_pattern_size.value() / 2.5, 
                    m_pattern_size.value() / 6.0, 
                    6,
                    m_pattern_angle.value());

        agg::conv_smooth_poly1_curve<agg::path_storage> smooth(m_ps);
        agg::conv_stroke<agg::conv_smooth_poly1_curve<agg::path_storage> > stroke(smooth);

        smooth.smooth_value(1.0);
        smooth.approximation_scale(4.0);
        stroke.width(m_pattern_size.value() / 15.0);

        delete [] m_pattern;
        m_pattern = new agg::int8u[size * size * pixfmt::pix_width];
        m_pattern_rbuf.attach(m_pattern, size, size, size * pixfmt::pix_width);

        pixfmt pixf(m_pattern_rbuf);
        agg::renderer_base<pixfmt> rb(pixf);
        agg::renderer_scanline_aa_solid<agg::renderer_base<pixfmt> > rs(rb);

        rb.clear(agg::rgba_pre(0.4, 0.0, 0.1, m_pattern_alpha.value())); // Pattern background color

        m_ras.add_path(smooth);
        rs.color(agg::srgba8(110,130,50));
        agg::render_scanlines(m_ras, m_sl, rs);

        m_ras.add_path(stroke);
        rs.color(agg::srgba8(0,50,80));
        agg::render_scanlines(m_ras, m_sl, rs);
    }

    //------------------------------------------------------------------------
    virtual void on_mouse_button_down(int x, int y, unsigned flags)
    {
        if(flags & agg::mouse_left)
        {
            agg::trans_affine polygon_mtx;

            polygon_mtx *= agg::trans_affine_translation(-m_polygon_cx, -m_polygon_cy);
            polygon_mtx *= agg::trans_affine_rotation(m_polygon_angle.value() * agg::pi / 180.0);
            polygon_mtx *= agg::trans_affine_scaling(m_polygon_scale.value(), m_polygon_scale.value());
            polygon_mtx *= agg::trans_affine_translation(m_polygon_cx, m_polygon_cy);

            double r = initial_width() / 3.0 - 8.0;
            create_star(m_polygon_cx, m_polygon_cy, r, r / 1.45, 14);

            agg::conv_transform<agg::path_storage> tr(m_ps, polygon_mtx);
            m_ras.add_path(tr);
            if(m_ras.hit_test(x, y))
            {
                m_dx = x - m_polygon_cx;
                m_dy = y - m_polygon_cy;
                m_flag = 1;
            }
        }
    }

  void draw_text(double x, double y, const char* str) {
    pixfmt_type pf(rbuf_window());
    agg::renderer_base<pixfmt_type> rb(pf);
    agg::renderer_scanline_aa_solid<agg::renderer_base<pixfmt_type> > ren(rb);

    agg::gsv_text txt;
    agg::conv_stroke<agg::gsv_text> txt_stroke(txt);
    txt_stroke.width(1.5);
    txt_stroke.line_cap(agg::round_cap);
    txt.size(10.0);
    txt.start_point(x, y);
    txt.text(str);
    m_ras.add_path(txt_stroke);
    ren.color(agg::rgba(0.0, 0.0, 0.0));
    agg::render_scanlines(m_ras, m_sl, ren);
  }

    void radial_shape(RenBase& rbase, const ColorRamp& colors,
                      double x1, double y1, double x2, double y2)
    {
        typedef RenBase renderer_base_type;
        typedef agg::gradient_radial gradient_func_type;
        typedef ColorRamp color_func_type;
        typedef agg::span_interpolator_linear<> interpolator_type;
        typedef agg::span_allocator<color> span_allocator_type;
        typedef agg::span_gradient<color, 
                                   interpolator_type, 
                                   gradient_func_type, 
                                   color_func_type> span_gradient_type;

        gradient_func_type  gradient_func;                   // The gradient function
        agg::trans_affine   gradient_mtx;
        interpolator_type   span_interpolator(gradient_mtx); // Span interpolator
        span_allocator_type span_allocator;                  // Span Allocator
        span_gradient_type  span_gradient(span_interpolator, 
                                          gradient_func, 
                                          colors, 
                                          0, 100);

        double cx = (x1 + x2) / 2.0;
        double cy = (y1 + y2) / 2.0;
        double r  = 0.5 * (((x2 - x1) < (y2 - y1)) ? (x2 - x1) : (y2 - y1));

        gradient_mtx *= agg::trans_affine_scaling(r / 100.0);
        gradient_mtx *= agg::trans_affine_translation(cx, cy);
        gradient_mtx *= trans_affine_resizing();
        gradient_mtx.invert();

        agg::ellipse ell(cx, cy, r, r, 100);
        agg::conv_transform<agg::ellipse> trans(ell, trans_affine_resizing());
        m_ras.add_path(trans);

        agg::render_scanlines_aa(m_ras, m_sl, rbase, span_allocator, span_gradient);
    }

void roadmap_canvas_draw_formated_string_angle (const RoadMapGuiPoint *position,
                                                RoadMapGuiPoint *center,
                                                int angle, int size,
                                                int font_type,
                                                const char *text)
{

   font_manager_type *fman;
   font_manager_type *image_fman;
   font_engine_type  *feng;
   font_engine_type  *image_feng;

   if ((font_type & FONT_TYPE_NORMAL) && (!RoadMapCanvasNormalFontLoaded))
      font_type = FONT_TYPE_BOLD;


   if (font_type & FONT_TYPE_NORMAL){
      fman = &m_fman_nor;
      feng = &m_feng_nor;
      image_feng = &m_image_feng_nor;
      image_fman = &m_image_fman_nor;
   }
   else{
      fman = &m_fman;
      feng = &m_feng;
      image_feng = &m_image_feng;
      image_fman = &m_image_fman;
   }


   if ((font_type & FONT_TYPE_BOLD) && (RoadMapCanvasFontLoaded != 1)) return;


   dbg_time_start(DBG_TIME_TEXT_FULL);
   dbg_time_start(DBG_TIME_TEXT_CNV);

   wchar_t wstr[255];
   int length = roadmap_canvas_agg_to_wchar (text, wstr, 255);
   if (length <=0) return;

#ifdef USE_FRIBIDI
   wchar_t *bidi_text = bidi_string(wstr);
   const wchar_t* p = bidi_text;
#else
   const wchar_t* p = wstr;
#endif

   ren_solid.color(CurrentPen->color);
   dbg_time_end(DBG_TIME_TEXT_CNV);

   double x  = 0;
   double y  = 0;
   if (size < 0) size = 15;

   if ( roadmap_screen_is_hd_screen() )
   {
     size = (int)(size * CANVAS_HD_FONT_FACTOR);
   }
   else{
#ifdef _WIN32
      size = (int) (size * 0.9);
#endif
   }

   if (angle == 0) {

      /* Use faster drawing for text with no angle */
      x  = position->x;
      y  = position->y;

//      ren_solid.color(agg::rgba8(0, 0, 0));

      image_feng->height(size);
      image_feng->width(size);

      while(*p) {
         const agg::glyph_cache* glyph = image_fman->glyph(*p);

         if(glyph) {
            image_fman->init_embedded_adaptors(glyph, x, y);

            agg::render_scanlines(image_fman->gray8_adaptor(),
                  image_fman->gray8_scanline(),
                  ren_solid);

            // increment pen position
            x += glyph->advance_x;
            y += glyph->advance_y;
         }
         ++p;
      }
   }
   else{
      feng->height(size);
      feng->width(size);
   }

   while(*p) {
      dbg_time_start(DBG_TIME_TEXT_ONE_LETTER);
      dbg_time_start(DBG_TIME_TEXT_GET_GLYPH);
//.........这里部分代码省略.........

    virtual void on_draw()
    {
        pixfmt            pixf(rbuf_window());
        pixfmt_pre        pixf_pre(rbuf_window());
        renderer_base     rb(pixf);
        renderer_base_pre rb_pre(pixf_pre);

        if(!m_test_flag)
        {
            rb.clear(agg::rgba(1, 1, 1));
        }

        if(m_trans_type.cur_item() == 0)
        {
            // For the affine parallelogram transformations we
            // calculate the 4-th (implicit) point of the parallelogram
            m_quad.xn(3) = m_quad.xn(0) + (m_quad.xn(2) - m_quad.xn(1));
            m_quad.yn(3) = m_quad.yn(0) + (m_quad.yn(2) - m_quad.yn(1));
        }

        if(!m_test_flag)
        {
            //--------------------------
            // Render the "quad" tool and controls
            g_rasterizer.add_path(m_quad);
            agg::render_scanlines_aa_solid(g_rasterizer, g_scanline, rb, agg::rgba(0, 0.3, 0.5, 0.6));

            //--------------------------
            agg::render_ctrl(g_rasterizer, g_scanline, rb, m_trans_type);
        }

        // Prepare the polygon to rasterize. Here we need to fill
        // the destination (transformed) polygon.
        g_rasterizer.clip_box(0, 0, width(), height());
        g_rasterizer.reset();
        g_rasterizer.move_to_d(m_quad.xn(0), m_quad.yn(0));
        g_rasterizer.line_to_d(m_quad.xn(1), m_quad.yn(1));
        g_rasterizer.line_to_d(m_quad.xn(2), m_quad.yn(2));
        g_rasterizer.line_to_d(m_quad.xn(3), m_quad.yn(3));


        typedef agg::span_allocator<color_type> span_alloc_type;
        span_alloc_type sa;
        agg::image_filter<agg::image_filter_hanning> filter;
    
        typedef agg::wrap_mode_reflect_auto_pow2 remainder_type;
        typedef agg::image_accessor_wrap<pixfmt, 
                                         remainder_type, 
                                         remainder_type> img_source_type;

        pixfmt img_pixf(rbuf_img(0));
        img_source_type img_src(img_pixf);

        enum subdiv_shift_e { subdiv_shift = 2 };
         
        switch(m_trans_type.cur_item())
        {
            case 0:
            {
                // Note that we consruct an affine matrix that transforms
                // a parallelogram to a rectangle, i.e., it's inverted.
                // It's actually the same as:
                // tr(g_x1, g_y1, g_x2, g_y2, m_triangle.polygon());
                // tr.invert();
                agg::trans_affine tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);

                // Also note that we can use the linear interpolator instead of 
                // arbitrary span_interpolator_trans. It works much faster, 
                // but the transformations must be linear and parellel.
                typedef agg::span_interpolator_linear<agg::trans_affine> interpolator_type;
                interpolator_type interpolator(tr);

                typedef span_image_filter_2x2<img_source_type,
                                              interpolator_type> span_gen_type;
                span_gen_type sg(img_src, interpolator, filter);
                agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg);
                break;
            }

            case 1:
            {
                agg::trans_bilinear tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);
                if(tr.is_valid())
                {
                    typedef agg::span_interpolator_linear<agg::trans_bilinear> interpolator_type;
                    interpolator_type interpolator(tr);

                    typedef span_image_filter_2x2<img_source_type,
                                                  interpolator_type> span_gen_type;
                    span_gen_type sg(img_src, interpolator, filter);
                    agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg);
                }
                break;
            }

            case 2:
            {
                agg::trans_perspective tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);
                if(tr.is_valid())
                {
//.........这里部分代码省略.........

    virtual void on_draw()
    {
        pixfmt pixf(rbuf_window());
        renderer_base rb(pixf);
        renderer_solid r(rb);
        rb.clear(agg::rgba(1, 1, 1));

        g_rasterizer.clip_box(0, 0, width(), height());

        if(m_trans_type.cur_item() == 0)
        {
            agg::trans_bilinear tr(g_x1, g_y1, g_x2, g_y2, m_quad.polygon());
            if(tr.is_valid())
            {
                //--------------------------
                // Render transformed lion
                //
                agg::conv_transform<agg::path_storage, 
                                    agg::trans_bilinear> trans(g_path, tr);

                agg::render_all_paths(g_rasterizer, g_scanline, r, trans, g_colors, g_path_idx, g_npaths);
                //--------------------------



                //--------------------------
                // Render transformed ellipse
                //
                agg::ellipse ell((g_x1 + g_x2) * 0.5, (g_y1 + g_y2) * 0.5, 
                                 (g_x2 - g_x1) * 0.5, (g_y2 - g_y1) * 0.5,
                                 200);
                agg::conv_stroke<agg::ellipse> ell_stroke(ell);
                ell_stroke.width(3.0);
                agg::conv_transform<agg::ellipse, 
                                    agg::trans_bilinear> trans_ell(ell, tr);

                agg::conv_transform<agg::conv_stroke<agg::ellipse>, 
                                    agg::trans_bilinear> trans_ell_stroke(ell_stroke, tr);

                g_rasterizer.add_path(trans_ell);
                r.color(agg::rgba(0.5, 0.3, 0.0, 0.3));
                agg::render_scanlines(g_rasterizer, g_scanline, r);

                g_rasterizer.add_path(trans_ell_stroke);
                r.color(agg::rgba(0.0, 0.3, 0.2, 1.0));
                agg::render_scanlines(g_rasterizer, g_scanline, r);
                //--------------------------

            }
        }
        else
        {
            agg::trans_perspective tr(g_x1, g_y1, g_x2, g_y2, m_quad.polygon());
            if(tr.is_valid())
            {

                //--------------------------
                // Render transformed lion
                //
                agg::conv_transform<agg::path_storage, 
                                    agg::trans_perspective> trans(g_path, tr);

                agg::render_all_paths(g_rasterizer, g_scanline, r, trans, g_colors, g_path_idx, g_npaths);

                //--------------------------



                //--------------------------
                // Render transformed ellipse
                //
                agg::ellipse ell((g_x1 + g_x2) * 0.5, (g_y1 + g_y2) * 0.5, 
                                 (g_x2 - g_x1) * 0.5, (g_y2 - g_y1) * 0.5,
                                 200);

                agg::conv_stroke<agg::ellipse> ell_stroke(ell);
                ell_stroke.width(3.0);
                agg::conv_transform<agg::ellipse, 
                                    agg::trans_perspective> trans_ell(ell, tr);


                agg::conv_transform<agg::conv_stroke<agg::ellipse>, 
                                    agg::trans_perspective> trans_ell_stroke(ell_stroke, tr);


                g_rasterizer.add_path(trans_ell);
                r.color(agg::rgba(0.5, 0.3, 0.0, 0.3));
                agg::render_scanlines(g_rasterizer, g_scanline, r);

                g_rasterizer.add_path(trans_ell_stroke);
                r.color(agg::rgba(0.0, 0.3, 0.2, 1.0));
                agg::render_scanlines(g_rasterizer, g_scanline, r);
                //--------------------------


                // Testing the reverse transformations
                //agg::trans_perspective tr2(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);
                //if(tr2.is_valid())
                //{
                //    double x, y;
//.........这里部分代码省略.........

    virtual void on_draw()
    {
        if(m_gamma.value() != m_old_gamma)
        {
            m_gamma_lut.gamma(m_gamma.value());
            load_img(0, "spheres");
            pixfmt pixf(rbuf_img(0));
            pixf.apply_gamma_dir(m_gamma_lut);
            m_old_gamma = m_gamma.value();
        }

        pixfmt            pixf(rbuf_window());
        pixfmt_pre        pixf_pre(rbuf_window());
        renderer_base     rb(pixf);
        renderer_base_pre rb_pre(pixf_pre);

        renderer_solid r(rb);

        rb.clear(agg::rgba(1, 1, 1));

        if(m_trans_type.cur_item() < 2)
        {
            // For the affine parallelogram transformations we
            // calculate the 4-th (implicit) point of the parallelogram
            m_quad.xn(3) = m_quad.xn(0) + (m_quad.xn(2) - m_quad.xn(1));
            m_quad.yn(3) = m_quad.yn(0) + (m_quad.yn(2) - m_quad.yn(1));
        }

        //--------------------------
        // Render the "quad" tool and controls
        g_rasterizer.add_path(m_quad);
        r.color(agg::rgba(0, 0.3, 0.5, 0.1));
        agg::render_scanlines(g_rasterizer, g_scanline, r);

        // Prepare the polygon to rasterize. Here we need to fill
        // the destination (transformed) polygon.
        g_rasterizer.clip_box(0, 0, width(), height());
        g_rasterizer.reset();
        int b = 0;
        g_rasterizer.move_to_d(m_quad.xn(0)-b, m_quad.yn(0)-b);
        g_rasterizer.line_to_d(m_quad.xn(1)+b, m_quad.yn(1)-b);
        g_rasterizer.line_to_d(m_quad.xn(2)+b, m_quad.yn(2)+b);
        g_rasterizer.line_to_d(m_quad.xn(3)-b, m_quad.yn(3)+b);

        typedef agg::span_allocator<color_type> span_alloc_type;
        span_alloc_type sa;
        agg::image_filter_bilinear filter_kernel;
        agg::image_filter_lut filter(filter_kernel, true);

        pixfmt pixf_img(rbuf_img(0));
        typedef agg::image_accessor_clone<pixfmt> source_type;
        source_type source(pixf_img);

        start_timer();
        switch(m_trans_type.cur_item())
        {
            case 0:
            {
                agg::trans_affine tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);

                typedef agg::span_interpolator_linear<agg::trans_affine> interpolator_type;
                interpolator_type interpolator(tr);

                typedef image_filter_2x2_type<source_type, 
                                              interpolator_type> span_gen_type;
                span_gen_type sg(source, interpolator, filter);
                agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg);
                break;
            }

            case 1:
            {
                agg::trans_affine tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);

                typedef agg::span_interpolator_linear<agg::trans_affine> interpolator_type;
                typedef image_resample_affine_type<source_type> span_gen_type;

                interpolator_type interpolator(tr);
                span_gen_type sg(source, interpolator, filter);
                sg.blur(m_blur.value());
                agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg);
                break;
            }

            case 2:
            {
                agg::trans_perspective tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);
                if(tr.is_valid())
                {
                    typedef agg::span_interpolator_linear_subdiv<agg::trans_perspective> interpolator_type;
                    interpolator_type interpolator(tr);

                    typedef image_filter_2x2_type<source_type,
                                                  interpolator_type> span_gen_type;
                    span_gen_type sg(source, interpolator, filter);
                    agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg);
                }
                break;
            }

//.........这里部分代码省略.........