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lazarus/components/aggpas/image_resample.dpr
mattias 36a2b1ea07 added aggpas 
git-svn-id: trunk@21942 -
2009-10-01 12:24:32 +00:00

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{mac_copy:spheres.bmp}
//
// 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
image_resample ;
uses
Math ,SysUtils ,
agg_basics ,
agg_platform_support ,
agg_color ,
agg_pixfmt ,
agg_pixfmt_rgba ,
agg_ctrl ,
agg_rbox_ctrl ,
agg_slider_ctrl ,
agg_rendering_buffer ,
agg_renderer_base ,
agg_renderer_scanline ,
agg_rasterizer_scanline_aa ,
agg_scanline ,
agg_scanline_u ,
agg_render_scanlines ,
agg_path_storage ,
agg_conv_transform ,
agg_conv_stroke ,
agg_trans_affine ,
agg_trans_perspective ,
agg_span_interpolator_linear ,
agg_span_interpolator_trans ,
agg_span_interpolator_persp ,
agg_span_subdiv_adaptor ,
agg_span_image_filter ,
agg_span_image_filter_rgba ,
agg_span_image_resample ,
agg_span_image_resample_rgba ,
agg_span_allocator ,
agg_image_filters ,
agg_gsv_text ,
agg_gamma_lut ,
interactive_polygon_ ,
file_utils_ ;
{$I agg_mode.inc }
const
flip_y = true;
base_shift = agg_color.base_shift;
var
g_x1 ,
g_y1 ,
g_x2 ,
g_y2 : double;
global_offset : int;
g_rasterizer : rasterizer_scanline_aa;
g_scanline : scanline_u8;
img_name ,p ,n ,x : shortstring;
type
the_application = object(platform_support )
m_gamma_lut : gamma_lut;
m_quad : interactive_polygon;
m_trans_type : rbox_ctrl;
m_gamma ,
m_blur : slider_ctrl;
m_old_gamma : double;
constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
destructor Destruct;
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_mouse_button_up (x ,y : int; flags : unsigned ); virtual;
procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
end;
{ CONSTRUCT }
constructor the_application.Construct;
begin
inherited Construct(format_ ,flip_y_ );
m_gamma_lut.Construct(2.0 ,base_shift ,base_shift );
m_quad.Construct (4 ,5.0 );
m_trans_type.Construct(400 ,5.0 ,430 + 170.0 ,100.0 ,not flip_y_ );
m_gamma.Construct (5.0 ,5.0 + 15 * 0 ,400-5 ,10.0 + 15 * 0 ,not flip_y_ );
m_blur.Construct (5.0 ,5.0 + 15 * 1 ,400-5 ,10.0 + 15 * 1 ,not flip_y_ );
m_old_gamma:=2.0;
m_trans_type.text_size_(7 );
m_trans_type.add_item ('Affine No Resample' );
m_trans_type.add_item ('Affine Resample' );
m_trans_type.add_item ('Perspective No Resample LERP' );
m_trans_type.add_item ('Perspective No Resample Exact' );
m_trans_type.add_item ('Perspective Resample LERP' );
m_trans_type.add_item ('Perspective Resample Exact' );
m_trans_type.cur_item_ (4 );
add_ctrl(@m_trans_type );
m_gamma.range_(0.5 ,3.0 );
m_gamma.value_(2.0 );
m_gamma.label_('Gamma=%.3f' );
add_ctrl(@m_gamma );
m_blur.range_(0.5, 2.0);
m_blur.value_(1.0 );
m_blur.label_('Blur=%.3f' );
add_ctrl(@m_blur );
end;
{ DESTRUCT }
destructor the_application.Destruct;
begin
inherited Destruct;
m_gamma_lut.Destruct;
m_quad.Destruct;
m_trans_type.Destruct;
m_gamma.Destruct;
m_blur.Destruct;
end;
{ ON_INIT }
procedure the_application.on_init;
var
x1 ,y1 ,x2 ,y2 ,dx ,dy : double;
pixf : pixel_formats;
begin
g_x1:=0.0;
g_y1:=0.0;
g_x2:=rbuf_img(0 )._width;
g_y2:=rbuf_img(0 )._height;
x1:=g_x1;// * 100.0;
y1:=g_y1;// * 100.0;
x2:=g_x2;// * 100.0;
y2:=g_y2;// * 100.0;
dx:=_width / 2.0 - (x2 - x1 ) / 2.0;
dy:=_height / 2.0 - (y2 - y1 ) / 2.0;
m_quad.xn_ptr(0 )^:=Floor(x1 + dx );
m_quad.yn_ptr(0 )^:=Floor(y1 + dy );// - 150;
m_quad.xn_ptr(1 )^:=Floor(x2 + dx );
m_quad.yn_ptr(1 )^:=Floor(y1 + dy );// - 110;
m_quad.xn_ptr(2 )^:=Floor(x2 + dx );
m_quad.yn_ptr(2 )^:=Floor(y2 + dy );// - 300;
m_quad.xn_ptr(3 )^:=Floor(x1 + dx );
m_quad.yn_ptr(3 )^:=Floor(y2 + dy );// - 200;
pixfmt_bgra32(pixf ,rbuf_img(0 ) );
pixf.apply_gamma_dir(@m_gamma_lut ,bgra_order );
end;
{ ON_DRAW }
procedure the_application.on_draw;
var
pixf ,pixf_pre : pixel_formats;
rb ,rb_pre : renderer_base;
rgba : aggclr;
r : renderer_scanline_aa_solid;
b : int;
sa : span_allocator;
tr : trans_affine;
sg : span_image_filter_ptr;
ri : renderer_scanline_aa;
trp : trans_perspective23;
interpolator : span_interpolator_linear;
interpsubdiv : span_interpolator_linear_subdiv;
interp_trans : span_interpolator_trans;
interp_plerp : span_interpolator_persp_lerp;
interp_exact : span_interpolator_persp_exact;
subdiv_adaptor : span_subdiv_adaptor;
filter_kernel : image_filter_hanning;
filter : image_filter_lut;
tm : double;
buf : array[0..63 ] of char;
t : gsv_text;
pt : conv_stroke;
begin
sg:=NIL;
if m_gamma._value <> m_old_gamma then
begin
m_gamma_lut.gamma_(m_gamma._value );
load_img(0 ,img_name );
pixfmt_bgra32(pixf ,rbuf_img(0 ) );
pixf.apply_gamma_dir(@m_gamma_lut ,bgra_order );
m_old_gamma:=m_gamma._value;
end;
// Initialize structures
pixfmt_bgra32 (pixf ,rbuf_window );
pixfmt_bgra32_pre(pixf_pre ,rbuf_window );
rb.Construct (@pixf );
rb_pre.Construct(@pixf_pre );
r.Construct(@rb );
rgba.ConstrDbl(1 ,1 ,1 );
rb.clear (@rgba );
if m_trans_type._cur_item < 2 then
begin
// For the affine parallelogram transformations we
// calculate the 4-th (implicit) point of the parallelogram
m_quad.xn_ptr(3 )^:=m_quad.xn(0 ) + (m_quad.xn(2 ) - m_quad.xn(1 ) );
m_quad.yn_ptr(3 )^:=m_quad.yn(0 ) + (m_quad.yn(2 ) - m_quad.yn(1 ) );
end;
// Render the "quad" tool and controls
g_rasterizer.add_path(@m_quad );
rgba.ConstrDbl (0 ,0.3 ,0.5 ,0.1 );
r.color_ (@rgba );
render_scanlines(@g_rasterizer ,@g_scanline ,@r );
// 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;
b:=0;
g_rasterizer.move_to_d(m_quad.xn(0 ) - b ,m_quad.yn(0 ) - b );
g_rasterizer.line_to_d(m_quad.xn(1 ) + b ,m_quad.yn(1 ) - b );
g_rasterizer.line_to_d(m_quad.xn(2 ) + b ,m_quad.yn(2 ) + b );
g_rasterizer.line_to_d(m_quad.xn(3 ) - b ,m_quad.yn(3 ) + b );
sa.Construct;
filter_kernel.Construct;
filter.Construct(@filter_kernel ,true );
rgba.ConstrPre(0 ,0 ,0 ,0 );
start_timer;
case m_trans_type._cur_item of
0 :
begin
tr.Construct(parallelo_ptr(m_quad.polygon ) ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
interpolator.Construct(@tr );
sg:=new(
span_image_filter_rgba_2x2_ptr ,
Construct(
@sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,@filter ,bgra_order ) );
ri.Construct (@rb_pre ,sg );
render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
end;
1 :
begin
tr.Construct(parallelo_ptr(m_quad.polygon ) ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
interpolator.Construct(@tr );
sg:=new(
span_image_resample_rgba_affine_ptr ,
Construct(
@sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,@filter ,bgra_order ) );
span_image_resample_ptr(sg ).blur_(m_blur._value );
ri.Construct (@rb_pre ,sg );
render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
end;
2 :
begin
trp.Construct(m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
if trp.is_valid then
begin
interpsubdiv.Construct(@trp );
sg:=new(
span_image_filter_rgba_2x2_ptr ,
Construct(
@sa ,rbuf_img(0 ) ,@rgba ,@interpsubdiv ,@filter ,bgra_order ) );
ri.Construct (@rb_pre ,sg );
render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
end;
end;
3 :
begin
trp.Construct(m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
if trp.is_valid then
begin
interp_trans.Construct(@trp );
sg:=new(
span_image_filter_rgba_2x2_ptr ,
Construct(
@sa ,rbuf_img(0 ) ,@rgba ,@interp_trans ,@filter ,bgra_order ) );
ri.Construct (@rb_pre ,sg );
render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
end;
end;
4 :
begin
interp_plerp.Construct (m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
subdiv_adaptor.Construct(@interp_plerp );
if interp_plerp.is_valid then
begin
sg:=new(
span_image_resample_rgba_ptr ,
Construct(
@sa ,rbuf_img(0 ) ,@rgba ,@subdiv_adaptor ,@filter ,bgra_order ) );
span_image_resample_ptr(sg ).blur_(m_blur._value );
ri.Construct (@rb_pre ,sg );
render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
end;
end;
5 :
begin
interp_exact.Construct (m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
subdiv_adaptor.Construct(@interp_exact );
if interp_exact.is_valid then
begin
sg:=new(
span_image_resample_rgba_ptr ,
Construct(
@sa ,rbuf_img(0 ) ,@rgba ,@subdiv_adaptor ,@filter ,bgra_order ) );
span_image_resample_ptr(sg ).blur_(m_blur._value );
ri.Construct (@rb_pre ,sg );
render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
end;
end;
end;
// Render Text
tm:=elapsed_time;
pixf.apply_gamma_inv(@m_gamma_lut ,bgra_order );
t.Construct;
t.size_(10.0 );
pt.Construct(@t );
pt.width_ (1.5 );
sprintf (@buf[0 ] ,'%3.2f ms' ,tm );
t.start_point_(10.0 ,70.0 );
t.text_ (@buf[0 ] );
g_rasterizer.add_path(@pt );
rgba.ConstrDbl (0 ,0 ,0 );
r.color_ (@rgba );
render_scanlines(@g_rasterizer ,@g_scanline ,@r );
// Render the controls
render_ctrl(@g_rasterizer ,@g_scanline ,@r ,@m_trans_type );
render_ctrl(@g_rasterizer ,@g_scanline ,@r ,@m_gamma );
render_ctrl(@g_rasterizer ,@g_scanline ,@r ,@m_blur );
// Free AGG resources
sa.Destruct;
filter.Destruct;
if sg <> NIL then
dispose(sg ,Destruct );
t.Destruct;
pt.Destruct;
end;
{ ON_MOUSE_MOVE }
procedure the_application.on_mouse_move;
begin
if flags and mouse_left <> 0 then
if m_quad.on_mouse_move(x ,y ) then
force_redraw;
if flags and mouse_left = 0 then
on_mouse_button_up(x ,y ,flags );
end;
{ ON_MOUSE_BUTTON_DOWN }
procedure the_application.on_mouse_button_down;
begin
if flags and mouse_left <> 0 then
if m_quad.on_mouse_button_down(x ,y ) then
force_redraw;
end;
{ ON_MOUSE_BUTTON_UP }
procedure the_application.on_mouse_button_up;
begin
if m_quad.on_mouse_button_up(x ,y ) then
force_redraw;
end;
{ ON_KEY }
procedure the_application.on_key;
var
cx ,cy : double;
tr : trans_affine;
tar : trans_affine_rotation;
tat : trans_affine_translation;
begin
if key = byte(' ' ) then
begin
cx:=(m_quad.xn(0 ) + m_quad.xn(1 ) + m_quad.xn(2 ) + m_quad.xn(3 ) ) / 4;
cy:=(m_quad.yn(0 ) + m_quad.yn(1 ) + m_quad.yn(2 ) + m_quad.yn(3 ) ) / 4;
tr.Construct;
tat.construct(-cx ,-cy );
tr:=tat;
tar.Construct(pi / 20{2.0} ); tr.multiply(@tar );
tat.Construct(cx ,cy ); tr.multiply(@tat );
tr.transform(@tr ,m_quad.xn_ptr(0 ) ,m_quad.yn_ptr(0 ) );
tr.transform(@tr ,m_quad.xn_ptr(1 ) ,m_quad.yn_ptr(1 ) );
tr.transform(@tr ,m_quad.xn_ptr(2 ) ,m_quad.yn_ptr(2 ) );
tr.transform(@tr ,m_quad.xn_ptr(3 ) ,m_quad.yn_ptr(3 ) );
force_redraw;
end;
if key = key_f1 then
message_(
'The demonstration of image transformations with resampling. '#13 +
'You can see the difference in quality between regular image transformers and '#13 +
'the ones with resampling. Of course, image tranformations with resampling work '#13 +
'slower because they provide the best possible quality.'#13#13 +
'How to play with:'#13#13 +
'Use the left mouse button to manipulate with image.'#13 +
'Press the spacebar to rotate the image by 1/20 of pi.' +
#13#13'Note: F2 key saves current "screenshot" file in this demo''s directory. ' );
end;
VAR
app : the_application;
buf : array [0..255 ] of char;
ext : string[10 ];
BEGIN
g_x1:=0;
g_y1:=0;
g_x2:=0;
g_y2:=0;
global_offset:=0;
g_rasterizer.Construct;
g_scanline.Construct;
app.Construct(pix_format_bgra32 ,flip_y );
app.caption_ ('AGG Example. Image Transformations with Resampling (F1-Help)' );
img_name:='spheres';
{$IFDEF WIN32 }
if ParamCount > 0 then
begin
spread_name(ParamStr(1 ) ,p ,n ,x );
img_name:=fold_name(p ,n ,'' );
end;
{$ENDIF }
if not app.load_img(0 ,img_name ) then
begin
img_name:=img_name + #0;
ext :=app._img_ext + #0;
if img_name = 'spheres'#0 then
begin
sprintf(@buf[0 ] ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
sprintf(@buf[StrLen(@buf ) ] ,'%s. '#13'Download http://www.antigrain.com/' ,ptrcomp(@ext[1 ] ) );
sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@img_name[1 ] ) );
sprintf(@buf[StrLen(@buf ) ] ,'%s'#13'or copy it from another directory if available.' ,ptrcomp(@ext[1 ] ) );
end
else
begin
sprintf(@buf[0 ] ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@ext[1 ] ) );
end;
app.message_(@buf[0 ] );
end
else
if app.init(600 ,600 ,window_resize ) then
app.run;
app.Destruct;
g_rasterizer.Destruct;
g_scanline.Destruct;
END.
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