// // AggPas 2.4 RM3 Demo application // Note: Press F1 key on run to see more info about this demo // // Paths: src;src\ctrl;src\svg;src\util;src\platform\win;expat-wrap // program alpha_mask3 ; uses SysUtils , agg_basics , agg_platform_support , agg_color , agg_pixfmt , agg_pixfmt_rgb , agg_pixfmt_gray , agg_ctrl , agg_slider_ctrl , agg_cbox_ctrl , agg_rbox_ctrl , agg_rendering_buffer , agg_renderer_base , agg_renderer_scanline , agg_renderer_primitives , agg_rasterizer_scanline_aa , agg_scanline , agg_scanline_p , agg_render_scanlines , agg_conv_curve , agg_conv_stroke , agg_conv_transform , agg_gsv_text , agg_pixfmt_amask_adaptor , agg_alpha_mask_u8 , agg_vertex_source , agg_path_storage , agg_trans_affine , agg_math_stroke , make_gb_poly_ , make_arrows_ ; {$I agg_mode.inc } const flip_y = true; type spiral = object(vertex_source ) m_x , m_y , m_r1 , m_r2 , m_step , m_start_angle , m_angle , m_curr_r , m_da , m_dr : double; m_start : boolean; constructor Construct(x ,y ,r1 ,r2 ,step : double; start_angle : double = 0 ); procedure rewind(path_id : unsigned ); virtual; function vertex(x ,y : double_ptr ) : unsigned; virtual; end; the_application = object(platform_support ) m_polygons , m_operation : rbox_ctrl; m_alpha_buf : int8u_ptr; m_alpha_aloc : unsigned; m_alpha_mask_rbuf : rendering_buffer; m_alpha_mask : amask_no_clip_gray8; m_ras : rasterizer_scanline_aa; m_sl : scanline_p8; m_x , m_y : double; constructor Construct(format_ : pix_format_e; flip_y_ : boolean ); destructor Destruct; procedure draw_text(x ,y : double; str : char_ptr ); procedure generate_alpha_mask(vs : vertex_source_ptr ); procedure perform_rendering (vs : vertex_source_ptr ); function render : unsigned; procedure on_init; virtual; procedure on_draw; virtual; procedure on_mouse_move (x ,y : int; flags : unsigned ); virtual; procedure on_mouse_button_down(x ,y : int; flags : unsigned ); virtual; procedure on_key(x ,y : int; key ,flags : unsigned ); virtual; end; { CONSTRUCT } constructor spiral.Construct; begin m_x :=x; m_y :=y; m_r1:=r1; m_r2:=r2; m_step :=step; m_start_angle:=start_angle; m_angle :=start_angle; m_da:=deg2rad(4.0 ); m_dr:=m_step / 90.0; end; { REWIND } procedure spiral.rewind; begin m_angle :=m_start_angle; m_curr_r:=m_r1; m_start :=true; end; { VERTEX } function spiral.vertex; begin if m_curr_r > m_r2 then begin result:=path_cmd_stop; exit; end; x^:=m_x + Cos(m_angle ) * m_curr_r; y^:=m_y + Sin(m_angle ) * m_curr_r; m_curr_r:=m_curr_r + m_dr; m_angle :=m_angle + m_da; if m_start then begin m_start:=false; result:=path_cmd_move_to; end else result:=path_cmd_line_to; end; { CONSTRUCT } constructor the_application.Construct; begin inherited Construct(format_ ,flip_y_ ); m_polygons.Construct (5.0 ,5.0 ,5.0 + 205.0 ,110.0 ,not flip_y_ ); m_operation.Construct(555.0 ,5.0 ,555.0 + 80.0 ,55.0 ,not flip_y_ ); m_alpha_buf :=NIL; m_alpha_aloc:=0; m_alpha_mask_rbuf.Construct; m_alpha_mask.Construct(@m_alpha_mask_rbuf ); m_ras.Construct; m_sl.Construct; m_x:=0; m_y:=0; m_operation.add_item ('AND' ); m_operation.add_item ('SUB' ); m_operation.cur_item_(0 ); add_ctrl(@m_operation ); m_operation.no_transform; m_polygons.add_item ('Two Simple Paths' ); m_polygons.add_item ('Closed Stroke' ); m_polygons.add_item ('Great Britain and Arrows' ); m_polygons.add_item ('Great Britain and Spiral' ); m_polygons.add_item ('Spiral and Glyph' ); m_polygons.cur_item_(3 ); add_ctrl(@m_polygons ); m_polygons.no_transform; end; { DESTRUCT } destructor the_application.Destruct; begin inherited Destruct; m_polygons.Destruct; m_operation.Destruct; m_alpha_mask_rbuf.Destruct; m_ras.Destruct; m_sl.Destruct; agg_freemem(pointer(m_alpha_buf ) ,m_alpha_aloc ); end; { DRAW_TEXT } procedure the_application.draw_text; var pf : pixel_formats; rb : renderer_base; ren : renderer_scanline_aa_solid; txt : gsv_text; txt_stroke : conv_stroke; rgba : aggclr; begin pixfmt_bgr24(pf ,rbuf_window ); rb.Construct (@pf ); ren.Construct(@rb ); txt.Construct; txt_stroke.Construct(@txt ); txt_stroke.width_ (1.5 ); txt_stroke.line_cap_(round_cap ); txt.size_ (10.0 ); txt.start_point_(x ,y ); txt.text_ (PChar(str ) ); m_ras.add_path (@txt_stroke); rgba.ConstrDbl (0.0 ,0.0 ,0.0 ); ren.color_ (@rgba ); render_scanlines(@m_ras ,@m_sl ,@ren ); txt.Destruct; txt_stroke.Destruct; end; { GENERATE_ALPHA_MASK } procedure the_application.generate_alpha_mask; var cx ,cy : unsigned; pixf : pixel_formats; gray : aggclr; rb : renderer_base; ren : renderer_scanline_aa_solid; t1 : double; buf : array[0..99 ] of char; begin cx:=trunc(_width ); cy:=trunc(_height ); agg_freemem(pointer(m_alpha_buf ) ,m_alpha_aloc ); m_alpha_aloc:=cx * cy; agg_getmem(pointer(m_alpha_buf ) ,m_alpha_aloc ); m_alpha_mask_rbuf.attach(m_alpha_buf ,cx ,cy ,cx ); pixfmt_gray8(pixf ,@m_alpha_mask_rbuf ); rb.Construct (@pixf ); ren.Construct(@rb ); start_timer; if m_operation._cur_item = 0 then begin gray.ConstrInt(0 ); rb.clear (@gray ); gray.ConstrInt(255 ); ren.color_ (@gray ); end else begin gray.ConstrInt(255 ); rb.clear (@gray ); gray.ConstrInt(0 ); ren.color_ (@gray ); end; m_ras.add_path (vs ); render_scanlines(@m_ras ,@m_sl ,@ren ); t1:=elapsed_time; sprintf (@buf[0 ] ,'Generate AlphaMask: %.3fms' ,t1 ); draw_text(250 ,20 ,@buf[0 ] ); end; { PERFORM_RENDERING } procedure the_application.perform_rendering; var pixf : pixel_formats; pixfa : pixfmt_amask_adaptor; rbase : renderer_base; ren : renderer_scanline_aa_solid; rgba : aggclr; t1 : double; buf : array[0..99 ] of char; begin pixfmt_bgr24(pixf ,rbuf_window ); pixfa.Construct(@pixf ,@m_alpha_mask ); rbase.Construct(@pixfa ); ren.Construct (@rbase ); rgba.ConstrDbl(0.5 ,0.0 ,0 ,0.5 ); ren.color_ (@rgba ); start_timer; m_ras.reset; m_ras.add_path (vs ); render_scanlines(@m_ras ,@m_sl ,@ren ); t1:=elapsed_time; sprintf (@buf[0 ] ,'Render with AlphaMask: %.3fms' ,t1 ); draw_text(250 ,5 ,@buf[0 ] ); pixfa.Destruct; end; { RENDER } function the_application.render; var pf : pixel_formats; rb : renderer_base; ren : renderer_scanline_aa_solid; ps1 , ps2 , gb_poly , arrows , glyph : path_storage; rgba : aggclr; x ,y : double; mtx1 , mtx2 , mtx : trans_affine; tat : trans_affine_translation; tas : trans_affine_scaling; stroke , stroke_gb_poly : conv_stroke; trans , trans_gb_poly , trans_arrows : conv_transform; curve : conv_curve; sp : spiral; begin pixfmt_bgr24(pf ,rbuf_window ); rb.Construct (@pf ); ren.Construct(@rb ); case m_polygons._cur_item of 0 : // Two simple paths begin ps1.Construct; ps2.Construct; x:=m_x - _initial_width / 2 + 100; y:=m_y - _initial_height / 2 + 100; ps1.move_to(x + 140 ,y + 145 ); ps1.line_to(x + 225 ,y + 44 ); ps1.line_to(x + 296 ,y + 219 ); ps1.close_polygon; ps1.line_to(x + 226 ,y + 289 ); ps1.line_to(x + 82 ,y + 292 ); ps1.move_to(x + 220 ,y + 222 ); ps1.line_to(x + 363 ,y + 249 ); ps1.line_to(x + 265 ,y + 331 ); ps1.move_to(x + 242 ,y + 243 ); ps1.line_to(x + 268 ,y + 309 ); ps1.line_to(x + 325 ,y + 261 ); ps1.move_to(x + 259 ,y + 259 ); ps1.line_to(x + 273 ,y + 288 ); ps1.line_to(x + 298 ,y + 266 ); ps2.move_to(100 + 32 ,100 + 77 ); ps2.line_to(100 + 473 ,100 + 263 ); ps2.line_to(100 + 351 ,100 + 290 ); ps2.line_to(100 + 354 ,100 + 374 ); m_ras.reset; m_ras.add_path (@ps1 ); rgba.ConstrDbl (0 ,0 ,0 ,0.1 ); ren.color_ (@rgba ); render_scanlines(@m_ras ,@m_sl ,@ren ); m_ras.reset; m_ras.add_path (@ps2 ); rgba.ConstrDbl (0 ,0.6 ,0 ,0.1 ); ren.color_ (@rgba ); render_scanlines(@m_ras ,@m_sl ,@ren ); generate_alpha_mask(@ps1 ); perform_rendering (@ps2 ); ps1.Destruct; ps2.Destruct; end; 1 : // Closed stroke begin ps1.Construct; ps2.Construct; stroke.Construct(@ps2 ); stroke.width_ (10.0 ); x:=m_x - _initial_width / 2 + 100; y:=m_y - _initial_height / 2 + 100; ps1.move_to(x + 140 ,y + 145 ); ps1.line_to(x + 225 ,y + 44 ); ps1.line_to(x + 296 ,y + 219 ); ps1.close_polygon; ps1.line_to(x + 226 ,y + 289 ); ps1.line_to(x + 82 ,y + 292 ); ps1.move_to(x + 220 - 50 ,y + 222 ); ps1.line_to(x + 265 - 50 ,y + 331 ); ps1.line_to(x + 363 - 50 ,y + 249 ); ps1.close_polygon(path_flags_ccw ); ps2.move_to(100 + 32 ,100 + 77 ); ps2.line_to(100 + 473 ,100 + 263 ); ps2.line_to(100 + 351 ,100 + 290 ); ps2.line_to(100 + 354 ,100 + 374 ); ps2.close_polygon; m_ras.reset; m_ras.add_path (@ps1 ); rgba.ConstrDbl (0 ,0 ,0 ,0.1 ); ren.color_ (@rgba ); render_scanlines(@m_ras ,@m_sl ,@ren ); m_ras.reset; m_ras.add_path (@stroke ); rgba.ConstrDbl (0 ,0.6 ,0 ,0.1 ); ren.color_ (@rgba ); render_scanlines(@m_ras ,@m_sl ,@ren ); generate_alpha_mask(@ps1 ); perform_rendering (@stroke ); ps1.Destruct; ps2.Destruct; stroke.Destruct; end; 2 : // Great Britain and Arrows begin gb_poly.Construct; arrows.Construct; make_gb_poly(@gb_poly ); make_arrows (@arrows ); mtx1.Construct; mtx2.Construct; tat.Construct(-1150 ,-1150 ); tas.Construct(2.0 ); mtx1.multiply(@tat ); mtx1.multiply(@tas ); mtx2:=mtx1; tat.Construct(m_x - _initial_width / 2 ,m_y - _initial_height / 2 ); mtx2.multiply(@tat ); trans_gb_poly.Construct(@gb_poly ,@mtx1 ); trans_arrows.Construct (@arrows ,@mtx2 ); m_ras.add_path (@trans_gb_poly ); rgba.ConstrDbl (0.5 ,0.5 ,0 ,0.1 ); ren.color_ (@rgba ); render_scanlines(@m_ras ,@m_sl ,@ren ); stroke_gb_poly.Construct(@trans_gb_poly ); stroke_gb_poly.width_ (0.1); m_ras.add_path (@stroke_gb_poly ); rgba.ConstrDbl (0 ,0 ,0 ); ren.color_ (@rgba ); render_scanlines (@m_ras ,@m_sl ,@ren ); m_ras.add_path (@trans_arrows ); rgba.ConstrDbl (0.0 ,0.5 ,0.5 ,0.1 ); ren.color_ (@rgba ); render_scanlines(@m_ras ,@m_sl ,@ren ); generate_alpha_mask(@trans_gb_poly ); perform_rendering (@trans_arrows ); gb_poly.Destruct; arrows.Destruct; stroke_gb_poly.Destruct; end; 3 : // Great Britain and a Spiral begin sp.Construct (m_x ,m_y ,10 ,150 ,30 ,0.0 ); stroke.Construct(@sp ); stroke.width_ (15.0 ); gb_poly.Construct; make_gb_poly(@gb_poly ); mtx.Construct; tat.Construct(-1150 ,-1150 ); tas.Construct(2.0 ); mtx.multiply(@tat ); mtx.multiply(@tas ); trans_gb_poly.Construct(@gb_poly ,@mtx ); m_ras.add_path (@trans_gb_poly ); rgba.ConstrDbl (0.5 ,0.5 ,0 ,0.1 ); ren.color_ (@rgba ); render_scanlines(@m_ras ,@m_sl ,@ren ); stroke_gb_poly.Construct(@trans_gb_poly ); stroke_gb_poly.width_ (0.1 ); m_ras.add_path (@stroke_gb_poly ); rgba.ConstrDbl (0 ,0 ,0 ); ren.color_ (@rgba ); render_scanlines (@m_ras ,@m_sl ,@ren ); m_ras.add_path (@stroke ); rgba.ConstrDbl (0.0 ,0.5 ,0.5 ,0.1 ); ren.color_ (@rgba ); render_scanlines(@m_ras ,@m_sl ,@ren ); generate_alpha_mask(@trans_gb_poly ); perform_rendering (@stroke ); stroke.Destruct; gb_poly.Destruct; stroke_gb_poly.Destruct; end; 4 : // Spiral and glyph begin sp.Construct (m_x ,m_y ,10 ,150 ,30 ,0.0 ); stroke.Construct(@sp ); stroke.width_ (15.0 ); glyph.Construct; glyph.move_to(28.47 ,6.45 ); glyph.curve3 (21.58 ,1.12 ,19.82 ,0.29 ); glyph.curve3 (17.19 ,-0.93 ,14.21 ,-0.93 ); glyph.curve3 (9.57 ,-0.93 ,6.57 ,2.25 ); glyph.curve3 (3.56 ,5.42 ,3.56 ,10.60 ); glyph.curve3 (3.56 ,13.87 ,5.03 ,16.26 ); glyph.curve3 (7.03 ,19.58 ,11.99 ,22.51 ); glyph.curve3 (16.94 ,25.44 ,28.47 ,29.64 ); glyph.line_to(28.47 ,31.40 ); glyph.curve3 (28.47 ,38.09 ,26.34 ,40.58 ); glyph.curve3 (24.22 ,43.07 ,20.17 ,43.07 ); glyph.curve3 (17.09 ,43.07 ,15.28 ,41.41 ); glyph.curve3 (13.43 ,39.75 ,13.43 ,37.60 ); glyph.line_to(13.53 ,34.77 ); glyph.curve3 (13.53 ,32.52 ,12.38 ,31.30 ); glyph.curve3 (11.23 ,30.08 ,9.38 ,30.08 ); glyph.curve3 (7.57 ,30.08 ,6.42 ,31.35 ); glyph.curve3 (5.27 ,32.62 ,5.27 ,34.81 ); glyph.curve3 (5.27 ,39.01 ,9.57 ,42.53 ); glyph.curve3 (13.87 ,46.04 ,21.63 ,46.04 ); glyph.curve3 (27.59 ,46.04 ,31.40 ,44.04 ); glyph.curve3 (34.28 ,42.53 ,35.64 ,39.31 ); glyph.curve3 (36.52 ,37.21 ,36.52 ,30.71 ); glyph.line_to(36.52 ,15.53 ); glyph.curve3 (36.52 ,9.13 ,36.77 ,7.69 ); glyph.curve3 (37.01 ,6.25 ,37.57 ,5.76 ); glyph.curve3 (38.13 ,5.27 ,38.87 ,5.27 ); glyph.curve3 (39.65 ,5.27 ,40.23 ,5.62 ); glyph.curve3 (41.26 ,6.25 ,44.19 ,9.18 ); glyph.line_to(44.19 ,6.45 ); glyph.curve3 (38.72 ,-0.88 ,33.74 ,-0.88 ); glyph.curve3 (31.35 ,-0.88 ,29.93 ,0.78 ); glyph.curve3 (28.52 ,2.44 ,28.47 ,6.45 ); glyph.close_polygon; glyph.move_to(28.47 ,9.62 ); glyph.line_to(28.47 ,26.66 ); glyph.curve3 (21.09 ,23.73 ,18.95 ,22.51 ); glyph.curve3 (15.09 ,20.36 ,13.43 ,18.02 ); glyph.curve3 (11.77 ,15.67 ,11.77 ,12.89 ); glyph.curve3 (11.77 ,9.38 ,13.87 ,7.06 ); glyph.curve3 (15.97 ,4.74 ,18.70 ,4.74 ); glyph.curve3 (22.41 ,4.74 ,28.47 ,9.62 ); glyph.close_polygon; mtx.Construct; tas.Construct(4.0 ); tat.Construct(220 ,200 ); mtx.multiply(@tas ); mtx.multiply(@tat ); trans.Construct(@glyph ,@mtx ); curve.Construct(@trans ); m_ras.reset; m_ras.add_path (@stroke ); rgba.ConstrDbl (0 ,0 ,0 ,0.1 ); ren.color_ (@rgba ); render_scanlines(@m_ras ,@m_sl ,@ren ); m_ras.reset; m_ras.add_path (@curve ); rgba.ConstrDbl (0 ,0.6 ,0 ,0.1 ); ren.color_ (@rgba ); render_scanlines(@m_ras ,@m_sl ,@ren ); generate_alpha_mask(@stroke ); perform_rendering (@curve ); stroke.Destruct; glyph.Destruct; curve.Destruct; end; end; end; { ON_INIT } procedure the_application.on_init; begin m_x:=_width / 2.0; m_y:=_height / 2.0; end; { ON_DRAW } procedure the_application.on_draw; var pf : pixel_formats; rgba : aggclr; ren_base : renderer_base; ren_solid : renderer_scanline_aa_solid; begin // Initialize structures pixfmt_bgr24(pf ,rbuf_window ); ren_base.Construct (@pf ); ren_solid.Construct(@ren_base ); rgba.ConstrDbl(1 ,1 ,1 ); ren_base.clear(@rgba ); // Render render; // Render the controls render_ctrl(@m_ras ,@m_sl ,@ren_solid ,@m_polygons ); render_ctrl(@m_ras ,@m_sl ,@ren_solid ,@m_operation ); end; { ON_MOUSE_MOVE } procedure the_application.on_mouse_move; begin if flags and mouse_left <> 0 then begin m_x:=x; m_y:=y; force_redraw; end; end; { ON_MOUSE_BUTTON_DOWN } procedure the_application.on_mouse_button_down; var buf : array[0..99 ] of char; begin if flags and mouse_left <> 0 then begin m_x:=x; m_y:=y; force_redraw; end; if flags and mouse_right <> 0 then begin sprintf (@buf[0 ] ,'%d ' ,x ); sprintf (@buf[StrLen(@buf ) ] ,'%d' ,y ); message_(@buf[0 ] ); end; end; { ON_KEY } procedure the_application.on_key; begin if key = key_f1 then message_( 'Yet another example of alpha-masking. It simulates arbitrary polygon clipping '#13 + 'similar to "gpc_test". Alpha-Masking allows you to perform only the Intersection '#13 + '(AND) and Difference (SUB) operations, but works much faster that conv_gpc. '#13 + 'Actually, there''re different complexities and different dependencies. '#13 + 'The performance of conv_gpc depends on the number of vertices, while'#13 + 'Alpha-Masking depends on the area of the rendered polygons. Still, with typical '#13 + 'screen resolutions, Alpha-Masking works much faster than General Polygon Clipper. '#13 + 'Compare the timings between "alpha_mask3" and "gpc_test"".'#13#13 + 'How to play with:'#13#13 + 'Use the left mouse button to move the upper shape around.'#13 + 'Use the right mouse button to display a message with current coordinates.' + #13#13'Note: F2 key saves current "screenshot" file in this demo''s directory. ' ); end; VAR app : the_application; BEGIN app.Construct(pix_format_bgr24 ,flip_y ); app.caption_ ('AGG Example. Alpha-Mask as a Polygon Clipper (F1-Help)' ); if app.init(640 ,520 ,window_resize ) then app.run; app.Destruct; END.