mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-04-30 13:03:45 +02:00
452 lines
10 KiB
ObjectPascal
452 lines
10 KiB
ObjectPascal
{mac_copy:spheres.bmp}
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//
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// AggPas 2.4 RM3 Demo application
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// Note: Press F1 key on run to see more info about this demo
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//
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// Paths: src;src\ctrl;src\svg;src\util;src\platform\win;expat-wrap
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//
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program
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image_perspective ;
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uses
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Math ,SysUtils ,
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agg_basics ,
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agg_platform_support ,
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agg_color ,
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agg_pixfmt ,
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agg_pixfmt_rgba ,
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agg_ctrl ,
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agg_rbox_ctrl ,
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agg_rendering_buffer ,
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agg_renderer_base ,
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agg_renderer_scanline ,
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agg_rasterizer_scanline_aa ,
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agg_scanline ,
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agg_scanline_u ,
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agg_render_scanlines ,
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agg_path_storage ,
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agg_conv_transform ,
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agg_conv_stroke ,
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agg_trans_affine ,
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agg_trans_bilinear ,
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agg_trans_perspective ,
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agg_span_interpolator_linear ,
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agg_span_interpolator_trans ,
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agg_span_subdiv_adaptor ,
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agg_span_image_filter ,
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agg_span_image_filter_rgba ,
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agg_span_allocator ,
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agg_image_filters ,
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agg_gsv_text ,
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interactive_polygon_ ,
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file_utils_ ;
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{$I agg_mode.inc }
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const
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flip_y = true;
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var
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g_x1 ,
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g_y1 ,
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g_x2 ,
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g_y2 : double;
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g_rasterizer : rasterizer_scanline_aa;
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g_scanline : scanline_u8;
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type
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the_application = object(platform_support )
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m_quad : interactive_polygon;
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m_trans_type : rbox_ctrl;
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constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
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destructor Destruct;
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procedure on_init; virtual;
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procedure on_draw; virtual;
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procedure on_mouse_move (x ,y : int; flags : unsigned ); virtual;
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procedure on_mouse_button_down(x ,y : int; flags : unsigned ); virtual;
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procedure on_mouse_button_up (x ,y : int; flags : unsigned ); virtual;
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procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
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end;
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{ CONSTRUCT }
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constructor the_application.Construct;
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begin
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inherited Construct(format_ ,flip_y_ );
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m_quad.Construct (4 ,5.0 );
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m_trans_type.Construct(420 ,5.0 ,420 + 170.0 ,70.0 ,not flip_y_ );
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m_trans_type.add_item ('Affine Parallelogram' );
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m_trans_type.add_item ('Bilinear' );
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m_trans_type.add_item ('Perspective' );
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m_trans_type.cur_item_(2 );
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add_ctrl(@m_trans_type );
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end;
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{ DESTRUCT }
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destructor the_application.Destruct;
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begin
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inherited Destruct;
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m_quad.Destruct;
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m_trans_type.Destruct;
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end;
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{ ON_INIT }
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procedure the_application.on_init;
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var
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x1 ,y1 ,x2 ,y2 ,dx ,dy : double;
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begin
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g_x1:=0.0;
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g_y1:=0.0;
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g_x2:=rbuf_img(0 )._width;
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g_y2:=rbuf_img(0 )._height;
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x1:=g_x1;// * 100.0;
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y1:=g_y1;// * 100.0;
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x2:=g_x2;// * 100.0;
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y2:=g_y2;// * 100.0;
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dx:=_width / 2.0 - (x2 - x1 ) / 2.0;
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dy:=_height / 2.0 - (y2 - y1 ) / 2.0;
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{ m_quad.xn_ptr(0 )^:=Floor(x1 + dx + 50 );
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m_quad.yn_ptr(0 )^:=Floor(y1 + dy + 50 );
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m_quad.xn_ptr(1 )^:=Floor(x2 + dx );
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m_quad.yn_ptr(1 )^:=Floor(y1 + dy );
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m_quad.xn_ptr(2 )^:=Floor(x2 + dx );
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m_quad.yn_ptr(2 )^:=Floor(y2 + dy );
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m_quad.xn_ptr(3 )^:=Floor(x1 + dx );
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m_quad.yn_ptr(3 )^:=Floor(y2 + dy ); {}
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m_quad.xn_ptr(0 )^:=100 + 50;
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m_quad.yn_ptr(0 )^:=100 + 50;
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m_quad.xn_ptr(1 )^:=_width - 100;
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m_quad.yn_ptr(1 )^:=100;
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m_quad.xn_ptr(2 )^:=_width - 100;
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m_quad.yn_ptr(2 )^:=_height - 100;
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m_quad.xn_ptr(3 )^:=100;
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m_quad.yn_ptr(3 )^:=_height - 100;
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end;
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{ ON_DRAW }
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procedure the_application.on_draw;
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var
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pixf ,pixf_pre : pixel_formats;
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rb ,rb_pre : renderer_base;
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rgba : aggclr;
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r : renderer_scanline_aa_solid;
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sa : span_allocator;
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tr : trans_affine;
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sg : span_image_filter_ptr;
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ri : renderer_scanline_aa;
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trb : trans_bilinear;
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trp : trans_perspective;
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interpolator : span_interpolator_linear;
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interp_trans : span_interpolator_trans;
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subdiv_adaptor : span_subdiv_adaptor;
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filter_kernel : image_filter_hermite;
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filter : image_filter_lut;
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tm : double;
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buf : array[0..63 ] of char;
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t : gsv_text;
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pt : conv_stroke;
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begin
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sg:=NIL;
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// Initialize structures
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pixfmt_bgra32 (pixf ,rbuf_window );
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pixfmt_bgra32_pre(pixf_pre ,rbuf_window );
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rb.Construct (@pixf );
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rb_pre.Construct(@pixf_pre );
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r.Construct (@rb );
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rgba.ConstrDbl(1 ,1 ,1 );
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rb.clear (@rgba );
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if m_trans_type._cur_item = 0 then
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begin
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// For the affine parallelogram transformations we
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// calculate the 4-th (implicit) point of the parallelogram
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m_quad.xn_ptr(3 )^:=m_quad.xn(0 ) + (m_quad.xn(2 ) - m_quad.xn(1 ) );
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m_quad.yn_ptr(3 )^:=m_quad.yn(0 ) + (m_quad.yn(2 ) - m_quad.yn(1 ) );
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end;
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// Render the "quad" tool
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g_rasterizer.add_path(@m_quad );
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rgba.ConstrDbl (0 ,0.3 ,0.5 ,0.6 );
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r.color_ (@rgba );
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render_scanlines(@g_rasterizer ,@g_scanline ,@r );
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// Prepare the polygon to rasterize. Here we need to fill
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// the destination (transformed) polygon.
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g_rasterizer.clip_box(0 ,0 ,_width ,_height );
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g_rasterizer.reset;
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g_rasterizer.move_to_d(m_quad.xn(0 ) ,m_quad.yn(0 ) );
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g_rasterizer.line_to_d(m_quad.xn(1 ) ,m_quad.yn(1 ) );
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g_rasterizer.line_to_d(m_quad.xn(2 ) ,m_quad.yn(2 ) );
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g_rasterizer.line_to_d(m_quad.xn(3 ) ,m_quad.yn(3 ) );
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sa.Construct;
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filter_kernel.Construct;
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filter.Construct(@filter_kernel ,false );
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rgba.ConstrPre(0 ,0 ,0 ,0 );
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start_timer;
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case m_trans_type._cur_item of
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0 :
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begin
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// Note that we consruct an affine matrix that transforms
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// a parallelogram to a rectangle, i.e., it's inverted.
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// It's actually the same as:
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// tr(g_x1, g_y1, g_x2, g_y2, m_triangle.polygon());
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// tr.invert();
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tr.Construct(parallelo_ptr(m_quad.polygon ) ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
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// Also note that we can use the linear interpolator instead of
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// arbitrary span_interpolator_trans. It works much faster,
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// but the transformations must be linear and parellel.
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interpolator.Construct(@tr );
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sg:=new(
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span_image_filter_rgba_nn_ptr ,
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Construct(
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@sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,bgra_order ) );
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ri.Construct (@rb_pre ,sg );
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render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
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end;
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1 :
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begin
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trb.Construct(m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
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if trb.is_valid then
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begin
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interpolator.Construct(@trb );
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sg:=new(
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span_image_filter_rgba_2x2_ptr ,
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Construct(
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@sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,@filter ,bgra_order ) );
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ri.Construct (@rb_pre ,sg );
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render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
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end;
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end;
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2 :
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begin
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trp.Construct(pointer(m_quad.polygon ) ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
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if trp.is_valid then
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begin
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// interpolator.Construct (@trp );
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// subdiv_adaptor.Construct(@interpolator );
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interp_trans.Construct(@trp );
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sg:=new(
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span_image_filter_rgba_2x2_ptr ,
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Construct(
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@sa ,rbuf_img(0 ) ,@rgba ,@interp_trans ,@filter ,bgra_order ) );
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ri.Construct (@rb_pre ,sg );
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render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
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end;
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end;
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end;
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// Render Text
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tm:=elapsed_time;
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t.Construct;
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t.size_(10.0 );
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pt.Construct(@t );
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pt.width_ (1.5 );
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sprintf (@buf[0 ] ,'%3.2f ms' ,tm );
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t.start_point_(10.0 ,10.0 );
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t.text_ (@buf[0 ] );
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g_rasterizer.add_path(@pt );
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rgba.ConstrDbl (0 ,0 ,0 );
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r.color_ (@rgba );
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render_scanlines(@g_rasterizer ,@g_scanline ,@r );
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// Render the controls
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render_ctrl(@g_rasterizer ,@g_scanline ,@r ,@m_trans_type );
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// Free AGG resources
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sa.Destruct;
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filter.Destruct;
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if sg <> NIL then
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dispose(sg ,Destruct );
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t.Destruct;
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pt.Destruct;
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end;
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{ ON_MOUSE_MOVE }
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procedure the_application.on_mouse_move;
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begin
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if flags and mouse_left <> 0 then
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if m_quad.on_mouse_move(x ,y ) then
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force_redraw;
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if flags and mouse_left = 0 then
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on_mouse_button_up(x ,y ,flags );
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end;
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{ ON_MOUSE_BUTTON_DOWN }
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procedure the_application.on_mouse_button_down;
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var
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buf : array[0..99 ] of char;
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begin
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if flags and mouse_left <> 0 then
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if m_quad.on_mouse_button_down(x ,y ) then
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force_redraw;
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if flags and mouse_right <> 0 then
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begin
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sprintf (@buf[0 ] ,'%d ' ,x );
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sprintf (@buf[StrLen(@buf ) ] ,'%d' ,y );
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message_(@buf[0 ] );
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end;
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end;
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{ ON_MOUSE_BUTTON_UP }
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procedure the_application.on_mouse_button_up;
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begin
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if m_quad.on_mouse_button_up(x ,y ) then
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force_redraw;
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end;
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{ ON_KEY }
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procedure the_application.on_key;
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begin
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if key = key_f1 then
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message_(
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'Image perspective transformations. There are two types of arbitrary quadrangle '#13 +
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'transformations, Perspective and Bilinear. The image transformer always uses '#13 +
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'reverse transformations, and there is a problem. The Perspective transformations '#13 +
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'are perfectly reversible, so they work correctly with images, but the Bilinear '#13 +
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'transformer behave somehow strange. It can transform a rectangle to a quadrangle, '#13 +
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'but not vice versa. In this example you can see this effect, when the edges of '#13 +
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'the image "sag". I''d highly appreciate if someone could help me with math for '#13 +
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'transformations similar to Bilinear ones, but correctly reversible (i.e., that '#13 +
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'can transform an arbitrary quadrangle to a rectangle). The bilinear transformations '#13 +
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'are simple, see agg_trans_bilinear.h and agg_simul_eq.h' +
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#13#13'Note: F2 key saves current "screenshot" file in this demo''s directory. ' );
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end;
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VAR
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app : the_application;
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buf : array [0..255 ] of char;
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ext : string[10 ];
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img_name ,p ,n ,x : shortstring;
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BEGIN
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g_x1:=0;
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g_y1:=0;
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g_x2:=0;
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g_y2:=0;
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g_rasterizer.Construct;
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g_scanline.Construct;
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app.Construct(pix_format_bgra32 ,flip_y );
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app.caption_ ('AGG Example. Image Perspective Transformations (F1-Help)' );
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img_name:='spheres';
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{$IFDEF WIN32 }
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if ParamCount > 0 then
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begin
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spread_name(ParamStr(1 ) ,p ,n ,x );
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img_name:=fold_name(p ,n ,'' );
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end;
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{$ENDIF }
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if not app.load_img(0 ,img_name ) then
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begin
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img_name:=img_name + #0;
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ext :=app._img_ext + #0;
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if img_name = 'spheres'#0 then
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begin
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sprintf(@buf[0 ] ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
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sprintf(@buf[StrLen(@buf ) ] ,'%s. '#13'Download http://www.antigrain.com/' ,ptrcomp(@ext[1 ] ) );
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sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@img_name[1 ] ) );
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sprintf(@buf[StrLen(@buf ) ] ,'%s'#13'or copy it from another directory if available.' ,ptrcomp(@ext[1 ] ) );
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end
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else
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begin
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sprintf(@buf[0 ] ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
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sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@ext[1 ] ) );
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end;
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app.message_(@buf[0 ] );
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end
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else
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if app.init(600 ,600 ,window_resize ) then
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app.run;
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app.Destruct;
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g_rasterizer.Destruct;
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g_scanline.Destruct;
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END. |