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|
//
// AggPas 2.4 RM3 Demo application
// Note: Press F1 key on run to see more info about this demo
//
// Paths: ..;..\ctrl;..\svg;..\util;..\platform\win;expat-wrap
//
program
compositing2 ;
uses
agg_basics ,
agg_color ,
agg_platform_support ,
agg_ctrl ,
agg_slider_ctrl ,
agg_rbox_ctrl ,
agg_rendering_buffer ,
agg_rasterizer_scanline_aa ,
agg_scanline_u ,
agg_renderer_base ,
agg_renderer_scanline ,
agg_render_scanlines ,
agg_rounded_rect ,
agg_pixfmt ,
agg_pixfmt_rgba ,
agg_span_allocator ,
agg_span_gradient ,
agg_gsv_text ,
agg_span_interpolator_linear ,
agg_array ,
agg_trans_affine ,
agg_ellipse ,
agg_conv_transform ;
{$I agg_mode.inc }
const
flip_y = true;
type
the_application = object(platform_support )
private
m_alpha_dst ,
m_alpha_src : slider_ctrl;
m_comp_op : rbox_ctrl;
m_ramp1 ,
m_ramp2 : pod_auto_array;
m_ras : rasterizer_scanline_aa;
m_sl : scanline_u8;
public
constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
destructor Destruct;
procedure radial_shape(
rbase : renderer_base_ptr;
colors : array_base_ptr;
x1 ,y1 ,x2 ,y2 : double );
procedure render_scene(rb : renderer_base_ptr );
procedure on_draw; virtual;
procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
end;
{ CONSTRUCT }
constructor the_application.Construct;
begin
inherited Construct(format_ ,flip_y_ );
m_alpha_dst.Construct(5 ,5 ,400 ,11 ,not flip_y_ );
m_alpha_src.Construct(5 ,5 + 15 ,400 ,11 + 15 ,not flip_y_ );
m_comp_op.Construct (420 ,5.0 ,420 + 170.0 ,395.0 ,not flip_y_ );
m_ramp1.Construct(256 ,sizeof(aggclr ) );
m_ramp2.Construct(256 ,sizeof(aggclr ) );
m_ras.Construct;
m_sl.Construct;
m_alpha_dst.label_('Dst Alpha=%.2f' );
m_alpha_dst.value_(1.0 );
add_ctrl(@m_alpha_dst );
m_alpha_src.label_('Src Alpha=%.2f' );
m_alpha_src.value_(1.0 );
add_ctrl(@m_alpha_src );
m_comp_op.text_size_(6.8 );
m_comp_op.add_item ('clear' );
m_comp_op.add_item ('src' );
m_comp_op.add_item ('dst' );
m_comp_op.add_item ('src-over' );
m_comp_op.add_item ('dst-over' );
m_comp_op.add_item ('src-in' );
m_comp_op.add_item ('dst-in' );
m_comp_op.add_item ('src-out' );
m_comp_op.add_item ('dst-out' );
m_comp_op.add_item ('src-atop' );
m_comp_op.add_item ('dst-atop' );
m_comp_op.add_item ('xor' );
m_comp_op.add_item ('plus' );
m_comp_op.add_item ('minus' );
m_comp_op.add_item ('multiply' );
m_comp_op.add_item ('screen' );
m_comp_op.add_item ('overlay' );
m_comp_op.add_item ('darken' );
m_comp_op.add_item ('lighten' );
m_comp_op.add_item ('color-dodge' );
m_comp_op.add_item ('color-burn' );
m_comp_op.add_item ('hard-light' );
m_comp_op.add_item ('soft-light' );
m_comp_op.add_item ('difference' );
m_comp_op.add_item ('exclusion' );
m_comp_op.add_item ('contrast' );
m_comp_op.add_item ('invert' );
m_comp_op.add_item ('invert-rgb' );
m_comp_op.cur_item_ (3 );
add_ctrl(@m_comp_op );
end;
{ DESTRUCT }
destructor the_application.Destruct;
begin
inherited Destruct;
m_alpha_dst.Destruct;
m_alpha_src.Destruct;
m_comp_op.Destruct;
m_ramp1.Destruct;
m_ramp2.Destruct;
m_ras.Destruct;
m_sl.Destruct;
end;
{ RADIAL_SHAPE }
procedure the_application.radial_shape;
var
gradient_func : gradient_radial;
gradient_mtx : trans_affine;
span_interpolator : span_interpolator_linear;
span_allocator_ : span_allocator;
span_gradient_ : span_gradient;
cx ,cy ,r : double;
tas : trans_affine_scaling;
tat : trans_affine_translation;
ell : ellipse;
trans : conv_transform;
rg : renderer_scanline_aa;
begin
gradient_func.Construct;
gradient_mtx.Construct;
span_interpolator.Construct(@gradient_mtx );
span_allocator_.Construct;
span_gradient_.Construct(
@span_allocator_ ,
@span_interpolator ,
@gradient_func ,
colors ,
0 ,100 );
cx:=(x1 + x2 ) / 2.0;
cy:=(y1 + y2 ) / 2.0;
if (x2 - x1 ) < (y2 - y1 ) then
r:=0.5 * (x2 - x1 )
else
r:=0.5 * (y2 - y1 );
tas.Construct (r / 100.0 );
gradient_mtx.multiply(@tas );
tat.Construct (cx ,cy );
gradient_mtx.multiply(@tat );
gradient_mtx.multiply(_trans_affine_resizing );
gradient_mtx.invert;
ell.Construct (cx ,cy ,r ,r ,100 );
trans.Construct(@ell ,_trans_affine_resizing );
m_ras.add_path(@trans );
rg.Construct (rbase ,@span_gradient_ );
render_scanlines(@m_ras ,@m_sl ,@rg );
span_allocator_.Destruct;
span_gradient_.Destruct;
end;
{ RENDER_SCENE }
procedure the_application.render_scene;
var
pixf : pixel_formats;
ren : renderer_base;
cx ,cy : double;
begin
pixfmt_custom_blend_rgba(pixf ,rbuf_window ,@comp_op_adaptor_rgba ,bgra_order );
ren.Construct(@pixf );
pixf.comp_op_(unsigned(comp_op_difference ) );
radial_shape (@ren ,@m_ramp1 ,50 ,50 ,50 + 320 ,50 + 320 );
pixf.comp_op_(m_comp_op._cur_item );
cx:=50;
cy:=50;
radial_shape(@ren ,@m_ramp2 ,cx + 120 - 70 ,cy + 120 - 70 ,cx + 120 + 70 ,cy + 120 + 70 );
radial_shape(@ren ,@m_ramp2 ,cx + 200 - 70 ,cy + 120 - 70 ,cx + 200 + 70 ,cy + 120 + 70 );
radial_shape(@ren ,@m_ramp2 ,cx + 120 - 70 ,cy + 200 - 70 ,cx + 120 + 70 ,cy + 200 + 70 );
radial_shape(@ren ,@m_ramp2 ,cx + 200 - 70 ,cy + 200 - 70 ,cx + 200 + 70 ,cy + 200 + 70 );
end;
{ generate_color_ramp }
procedure generate_color_ramp(c : pod_auto_array_ptr; c1 ,c2 ,c3 ,c4 : aggclr_ptr );
var
i : unsigned;
begin
i:=0;
while i < 85 do
begin
aggclr_ptr(c.array_operator(i ) )^:=c1.gradient(c2 ,i / 85.0 );
inc(i );
end;
while i < 170 do
begin
aggclr_ptr(c.array_operator(i ) )^:=c2.gradient(c3 ,(i - 85 ) / 85.0 );
inc(i );
end;
while i < 256 do
begin
aggclr_ptr(c.array_operator(i ) )^:=c3.gradient(c4 ,(i - 170 ) / 85.0 );
inc(i );
end;
end;
{ ON_DRAW }
procedure the_application.on_draw;
var
pixf : pixel_formats;
rgba : aggclr;
rb : renderer_base;
rs : renderer_scanline_aa_solid;
c1 ,c2 ,c3 ,c4 : aggclr;
begin
// Initialize structures
// pixfmt_alpha_blend_rgba(pixf ,rbuf_window ,bgra_order ); {!}
pixfmt_bgra32(pixf ,rbuf_window );
rb.Construct(@pixf );
rs.Construct(@rb );
rgba.ConstrInt(255 ,255 ,255 );
rb.clear (@rgba );
// Render
c1.ConstrDbl(0 ,0 ,0 ,m_alpha_dst._value );
c2.ConstrDbl(0 ,0 ,1 ,m_alpha_dst._value );
c3.ConstrDbl(0 ,1 ,0 ,m_alpha_dst._value );
c4.ConstrDbl(1 ,0 ,0 ,0 );
generate_color_ramp(@m_ramp1 ,@c1 ,@c2 ,@c3 ,@c4 );
c1.ConstrDbl(0 ,0 ,0 ,m_alpha_src._value );
c2.ConstrDbl(0 ,0 ,1 ,m_alpha_src._value );
c3.ConstrDbl(0 ,1 ,0 ,m_alpha_src._value );
c4.ConstrDbl(1 ,0 ,0 ,0 );
generate_color_ramp(@m_ramp2 ,@c1 ,@c2 ,@c3 ,@c4 );
render_scene(@rb );
// Render the controls
render_ctrl(@m_ras ,@m_sl ,@rs ,@m_alpha_dst );
render_ctrl(@m_ras ,@m_sl ,@rs ,@m_alpha_src );
render_ctrl(@m_ras ,@m_sl ,@rs ,@m_comp_op );
end;
{ ON_KEY }
procedure the_application.on_key;
begin
if key = key_f1 then
message_(
'Another demo example with extended compositing modes. ' );
end;
VAR
app : the_application;
BEGIN
app.Construct(pix_format_bgra32 ,flip_y );
app.caption_ ('AGG Example. Compositing Modes (F1-Help)' );
if app.init(600 ,400 ,window_resize or window_keep_aspect_ratio ) then
app.run;
app.Destruct;
END.
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