#include <stdlib.h> #include <ctype.h> #include <stdio.h> #include "agg_basics.h" #include "agg_rendering_buffer.h" #include "agg_rasterizer_scanline_aa.h" #include "agg_scanline_u.h" #include "agg_renderer_scanline.h" #include "agg_path_storage.h" #include "agg_conv_transform.h" #include "agg_trans_affine.h" #include "agg_trans_bilinear.h" #include "agg_trans_perspective.h" #include "agg_span_allocator.h" #include "agg_span_interpolator_linear.h" #include "agg_span_interpolator_trans.h" #include "agg_span_subdiv_adaptor.h" #include "agg_pixfmt_rgba.h" #include "agg_image_accessors.h" #include "agg_span_image_filter_rgba.h" #include "ctrl/agg_rbox_ctrl.h" #include "platform/agg_platform_support.h" #include "interactive_polygon.h" enum flip_y_e { flip_y = true }; agg::rasterizer_scanline_aa<> g_rasterizer; agg::scanline_u8 g_scanline; double g_x1 = 0; double g_y1 = 0; double g_x2 = 0; double g_y2 = 0; class the_application : public agg::platform_support { public: typedef agg::pixfmt_bgra32 pixfmt; typedef pixfmt::color_type color_type; typedef agg::renderer_base<pixfmt> renderer_base; typedef agg::renderer_scanline_aa_solid<renderer_base> renderer_solid; typedef agg::pixfmt_bgra32_pre pixfmt_pre; typedef agg::renderer_base<pixfmt_pre> renderer_base_pre; agg::interactive_polygon m_quad; agg::rbox_ctrl<agg::rgba8> m_trans_type; the_application(agg::pix_format_e format, bool flip_y) : agg::platform_support(format, flip_y), m_quad(4, 5.0), m_trans_type(420, 5.0, 420+170.0, 70.0, !flip_y) { m_trans_type.add_item("Affine Parallelogram"); m_trans_type.add_item("Bilinear"); m_trans_type.add_item("Perspective"); m_trans_type.cur_item(2); add_ctrl(m_trans_type); } virtual void on_init() { double d = 0.0; g_x1 = d; g_y1 = d; g_x2 = rbuf_img(0).width() - d; g_y2 = rbuf_img(0).height() - d; m_quad.xn(0) = 100; m_quad.yn(0) = 100; m_quad.xn(1) = width() - 100; m_quad.yn(1) = 100; m_quad.xn(2) = width() - 100; m_quad.yn(2) = height() - 100; m_quad.xn(3) = 100; m_quad.yn(3) = height() - 100; } 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); renderer_solid r(rb); 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)); } //-------------------------- // 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)); // 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)); agg::span_allocator<color_type> sa; agg::image_filter_bilinear filter_kernel; agg::image_filter_lut filter(filter_kernel, false); pixfmt pixf_img(rbuf_img(0)); //typedef agg::image_accessor_wrap<pixfmt, // agg::wrap_mode_reflect, // agg::wrap_mode_reflect> img_accessor_type; //img_accessor_type ia(pixf_img); //typedef agg::image_accessor_clip<pixfmt> img_accessor_type; //img_accessor_type ia(pixf_img, agg::rgba(1,1,1)); typedef agg::image_accessor_clone<pixfmt> img_accessor_type; img_accessor_type ia(pixf_img); start_timer(); 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 agg::span_image_filter_rgba_nn<img_accessor_type, interpolator_type> span_gen_type; span_gen_type sg(ia, interpolator); 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 agg::span_image_filter_rgba_2x2<img_accessor_type, interpolator_type> span_gen_type; span_gen_type sg(ia, 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()) { // Subdivision and linear interpolation (faster, but less accurate) //----------------------- //typedef agg::span_interpolator_linear<agg::trans_perspective> interpolator_type; //typedef agg::span_subdiv_adaptor<interpolator_type> subdiv_adaptor_type; //interpolator_type interpolator(tr); //subdiv_adaptor_type subdiv_adaptor(interpolator); // //typedef agg::span_image_filter_rgba_2x2<img_accessor_type, // subdiv_adaptor_type> span_gen_type; //span_gen_type sg(ia, subdiv_adaptor, filter); //----------------------- // Direct calculations of the coordinates //----------------------- typedef agg::span_interpolator_trans<agg::trans_perspective> interpolator_type; interpolator_type interpolator(tr); typedef agg::span_image_filter_rgba_2x2<img_accessor_type, interpolator_type> span_gen_type; span_gen_type sg(ia, interpolator, filter); //----------------------- agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg); } break; } } double tm = elapsed_time(); char buf[128]; agg::gsv_text t; t.size(10.0); agg::conv_stroke<agg::gsv_text> pt(t); pt.width(1.5); sprintf(buf, "%3.2f ms", tm); t.start_point(10.0, 10.0); t.text(buf); g_rasterizer.add_path(pt); agg::render_scanlines_aa_solid(g_rasterizer, g_scanline, rb, agg::rgba(0,0,0)); //-------------------------- agg::render_ctrl(g_rasterizer, g_scanline, rb, m_trans_type); } virtual void on_mouse_button_down(int x, int y, unsigned flags) { if(flags & agg::mouse_left) { if(m_quad.on_mouse_button_down(x, y)) { force_redraw(); } } } virtual void on_mouse_move(int x, int y, unsigned flags) { if(flags & agg::mouse_left) { if(m_quad.on_mouse_move(x, y)) { force_redraw(); } } if((flags & agg::mouse_left) == 0) { on_mouse_button_up(x, y, flags); } } virtual void on_mouse_button_up(int x, int y, unsigned flags) { if(m_quad.on_mouse_button_up(x, y)) { force_redraw(); } } }; int agg_main(int argc, char* argv[]) { the_application app(agg::pix_format_bgra32, flip_y); app.caption("AGG Example. Image Perspective Transformations"); const char* img_name = "spheres"; if(argc >= 2) img_name = argv[1]; if(!app.load_img(0, img_name)) { char buf[256]; if(strcmp(img_name, "spheres") == 0) { sprintf(buf, "File not found: %s%s. Download http://www.antigrain.com/%s%s\n" "or copy it from another directory if available.", img_name, app.img_ext(), img_name, app.img_ext()); } else { sprintf(buf, "File not found: %s%s", img_name, app.img_ext()); } app.message(buf); return 1; } /* // Testing the "black border" issue with alpha channel //---------------------------------------- the_application::pixfmt pixf(app.rbuf_img(0)); the_application::renderer_base rbase(pixf); rbase.clear(agg::rgba8(0,0,0,0)); unsigned i; for(i = 0; i < 50; i++) { agg::ellipse ell(rand() % rbase.width(), rand() % rbase.height(), rand() % 20 + 5, rand() % 20 + 5, 100); g_rasterizer.add_path(ell); agg::render_scanlines_aa_solid(g_rasterizer, g_scanline, rbase, agg::rgba8((rand() & 0x7F) + 127, (rand() & 0x7F) + 127, (rand() & 0x7F) + 127, 255)); } */ if(app.init(600, 600, agg::window_resize)) { return app.run(); } return 1; } |