mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-05-01 02:43:39 +02:00
336 lines
7.1 KiB
ObjectPascal
336 lines
7.1 KiB
ObjectPascal
//
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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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compositing2 ;
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uses
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agg_basics ,
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agg_color ,
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agg_platform_support ,
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agg_ctrl ,
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agg_slider_ctrl ,
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agg_rbox_ctrl ,
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agg_rendering_buffer ,
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agg_rasterizer_scanline_aa ,
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agg_scanline_u ,
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agg_renderer_base ,
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agg_renderer_scanline ,
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agg_render_scanlines ,
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agg_rounded_rect ,
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agg_pixfmt ,
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agg_pixfmt_rgba ,
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agg_span_allocator ,
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agg_span_gradient ,
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agg_gsv_text ,
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agg_span_interpolator_linear ,
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agg_array ,
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agg_trans_affine ,
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agg_ellipse ,
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agg_conv_transform ;
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{$I agg_mode.inc }
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const
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flip_y = true;
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type
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the_application = object(platform_support )
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private
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m_alpha_dst ,
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m_alpha_src : slider_ctrl;
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m_comp_op : rbox_ctrl;
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m_ramp1 ,
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m_ramp2 : pod_auto_array;
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m_ras : rasterizer_scanline_aa;
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m_sl : scanline_u8;
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public
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constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
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destructor Destruct;
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procedure radial_shape(
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rbase : renderer_base_ptr;
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colors : array_base_ptr;
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x1 ,y1 ,x2 ,y2 : double );
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procedure render_scene(rb : renderer_base_ptr );
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procedure on_draw; 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_alpha_dst.Construct(5 ,5 ,400 ,11 ,not flip_y_ );
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m_alpha_src.Construct(5 ,5 + 15 ,400 ,11 + 15 ,not flip_y_ );
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m_comp_op.Construct (420 ,5.0 ,420 + 170.0 ,395.0 ,not flip_y_ );
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m_ramp1.Construct(256 ,sizeof(aggclr ) );
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m_ramp2.Construct(256 ,sizeof(aggclr ) );
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m_ras.Construct;
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m_sl.Construct;
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m_alpha_dst.label_('Dst Alpha=%.2f' );
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m_alpha_dst.value_(1.0 );
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add_ctrl(@m_alpha_dst );
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m_alpha_src.label_('Src Alpha=%.2f' );
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m_alpha_src.value_(1.0 );
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add_ctrl(@m_alpha_src );
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m_comp_op.text_size_(6.8 );
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m_comp_op.add_item ('clear' );
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m_comp_op.add_item ('src' );
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m_comp_op.add_item ('dst' );
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m_comp_op.add_item ('src-over' );
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m_comp_op.add_item ('dst-over' );
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m_comp_op.add_item ('src-in' );
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m_comp_op.add_item ('dst-in' );
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m_comp_op.add_item ('src-out' );
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m_comp_op.add_item ('dst-out' );
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m_comp_op.add_item ('src-atop' );
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m_comp_op.add_item ('dst-atop' );
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m_comp_op.add_item ('xor' );
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m_comp_op.add_item ('plus' );
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m_comp_op.add_item ('minus' );
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m_comp_op.add_item ('multiply' );
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m_comp_op.add_item ('screen' );
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m_comp_op.add_item ('overlay' );
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m_comp_op.add_item ('darken' );
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m_comp_op.add_item ('lighten' );
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m_comp_op.add_item ('color-dodge' );
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m_comp_op.add_item ('color-burn' );
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m_comp_op.add_item ('hard-light' );
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m_comp_op.add_item ('soft-light' );
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m_comp_op.add_item ('difference' );
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m_comp_op.add_item ('exclusion' );
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m_comp_op.add_item ('contrast' );
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m_comp_op.add_item ('invert' );
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m_comp_op.add_item ('invert-rgb' );
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m_comp_op.cur_item_ (3 );
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add_ctrl(@m_comp_op );
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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_alpha_dst.Destruct;
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m_alpha_src.Destruct;
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m_comp_op.Destruct;
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m_ramp1.Destruct;
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m_ramp2.Destruct;
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m_ras.Destruct;
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m_sl.Destruct;
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end;
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{ RADIAL_SHAPE }
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procedure the_application.radial_shape;
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var
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gradient_func : gradient_radial;
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gradient_mtx : trans_affine;
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span_interpolator : span_interpolator_linear;
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span_allocator_ : span_allocator;
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span_gradient_ : span_gradient;
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cx ,cy ,r : double;
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tas : trans_affine_scaling;
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tat : trans_affine_translation;
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ell : ellipse;
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trans : conv_transform;
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rg : renderer_scanline_aa;
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begin
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gradient_func.Construct;
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gradient_mtx.Construct;
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span_interpolator.Construct(@gradient_mtx );
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span_allocator_.Construct;
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span_gradient_.Construct(
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@span_allocator_ ,
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@span_interpolator ,
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@gradient_func ,
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colors ,
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0 ,100 );
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cx:=(x1 + x2 ) / 2.0;
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cy:=(y1 + y2 ) / 2.0;
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if (x2 - x1 ) < (y2 - y1 ) then
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r:=0.5 * (x2 - x1 )
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else
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r:=0.5 * (y2 - y1 );
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tas.Construct (r / 100.0 );
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gradient_mtx.multiply(@tas );
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tat.Construct (cx ,cy );
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gradient_mtx.multiply(@tat );
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gradient_mtx.multiply(_trans_affine_resizing );
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gradient_mtx.invert;
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ell.Construct (cx ,cy ,r ,r ,100 );
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trans.Construct(@ell ,_trans_affine_resizing );
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m_ras.add_path(@trans );
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rg.Construct (rbase ,@span_gradient_ );
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render_scanlines(@m_ras ,@m_sl ,@rg );
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span_allocator_.Destruct;
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span_gradient_.Destruct;
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end;
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{ RENDER_SCENE }
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procedure the_application.render_scene;
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var
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pixf : pixel_formats;
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ren : renderer_base;
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cx ,cy : double;
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begin
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pixfmt_custom_blend_rgba(pixf ,rbuf_window ,@comp_op_adaptor_rgba ,bgra_order );
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ren.Construct(@pixf );
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pixf.comp_op_(unsigned(comp_op_difference ) );
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radial_shape (@ren ,@m_ramp1 ,50 ,50 ,50 + 320 ,50 + 320 );
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pixf.comp_op_(m_comp_op._cur_item );
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cx:=50;
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cy:=50;
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radial_shape(@ren ,@m_ramp2 ,cx + 120 - 70 ,cy + 120 - 70 ,cx + 120 + 70 ,cy + 120 + 70 );
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radial_shape(@ren ,@m_ramp2 ,cx + 200 - 70 ,cy + 120 - 70 ,cx + 200 + 70 ,cy + 120 + 70 );
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radial_shape(@ren ,@m_ramp2 ,cx + 120 - 70 ,cy + 200 - 70 ,cx + 120 + 70 ,cy + 200 + 70 );
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radial_shape(@ren ,@m_ramp2 ,cx + 200 - 70 ,cy + 200 - 70 ,cx + 200 + 70 ,cy + 200 + 70 );
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end;
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{ generate_color_ramp }
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procedure generate_color_ramp(c : pod_auto_array_ptr; c1 ,c2 ,c3 ,c4 : aggclr_ptr );
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var
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i : unsigned;
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begin
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i:=0;
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while i < 85 do
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begin
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aggclr_ptr(c.array_operator(i ) )^:=c1.gradient(c2 ,i / 85.0 );
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inc(i );
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end;
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while i < 170 do
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begin
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aggclr_ptr(c.array_operator(i ) )^:=c2.gradient(c3 ,(i - 85 ) / 85.0 );
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inc(i );
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end;
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while i < 256 do
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begin
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aggclr_ptr(c.array_operator(i ) )^:=c3.gradient(c4 ,(i - 170 ) / 85.0 );
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inc(i );
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end;
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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 : pixel_formats;
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rgba : aggclr;
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rb : renderer_base;
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rs : renderer_scanline_aa_solid;
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c1 ,c2 ,c3 ,c4 : aggclr;
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begin
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// Initialize structures
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// pixfmt_alpha_blend_rgba(pixf ,rbuf_window ,bgra_order ); {!}
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pixfmt_bgra32(pixf ,rbuf_window );
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rb.Construct(@pixf );
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rs.Construct(@rb );
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rgba.ConstrInt(255 ,255 ,255 );
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rb.clear (@rgba );
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// Render
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c1.ConstrDbl(0 ,0 ,0 ,m_alpha_dst._value );
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c2.ConstrDbl(0 ,0 ,1 ,m_alpha_dst._value );
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c3.ConstrDbl(0 ,1 ,0 ,m_alpha_dst._value );
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c4.ConstrDbl(1 ,0 ,0 ,0 );
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generate_color_ramp(@m_ramp1 ,@c1 ,@c2 ,@c3 ,@c4 );
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c1.ConstrDbl(0 ,0 ,0 ,m_alpha_src._value );
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c2.ConstrDbl(0 ,0 ,1 ,m_alpha_src._value );
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c3.ConstrDbl(0 ,1 ,0 ,m_alpha_src._value );
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c4.ConstrDbl(1 ,0 ,0 ,0 );
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generate_color_ramp(@m_ramp2 ,@c1 ,@c2 ,@c3 ,@c4 );
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render_scene(@rb );
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// Render the controls
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render_ctrl(@m_ras ,@m_sl ,@rs ,@m_alpha_dst );
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render_ctrl(@m_ras ,@m_sl ,@rs ,@m_alpha_src );
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render_ctrl(@m_ras ,@m_sl ,@rs ,@m_comp_op );
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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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'Another demo example with extended compositing modes. ' );
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end;
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VAR
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app : the_application;
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BEGIN
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app.Construct(pix_format_bgra32 ,flip_y );
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app.caption_ ('AGG Example. Compositing Modes (F1-Help)' );
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if app.init(600 ,400 ,window_resize or window_keep_aspect_ratio ) then
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app.run;
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app.Destruct;
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END. |