1{mac_copy:spheres.bmp}
2//
3// AggPas 2.4 RM3 Demo application
4// Note: Press F1 key on run to see more info about this demo
5//
6// Paths: src;src\ctrl;src\svg;src\util;src\platform\win;expat-wrap
7//
8program
9 image_resample ;
10
11uses
12 Math ,SysUtils ,
13
14 agg_basics ,
15 agg_platform_support ,
16
17 agg_color ,
18 agg_pixfmt ,
19 agg_pixfmt_rgba ,
20
21 agg_ctrl ,
22 agg_rbox_ctrl ,
23 agg_slider_ctrl ,
24
25 agg_rendering_buffer ,
26 agg_renderer_base ,
27 agg_renderer_scanline ,
28 agg_rasterizer_scanline_aa ,
29 agg_scanline ,
30 agg_scanline_u ,
31 agg_render_scanlines ,
32
33 agg_path_storage ,
34 agg_conv_transform ,
35 agg_conv_stroke ,
36 agg_trans_affine ,
37 agg_trans_perspective ,
38 agg_span_interpolator_linear ,
39 agg_span_interpolator_trans ,
40 agg_span_interpolator_persp ,
41 agg_span_subdiv_adaptor ,
42 agg_span_image_filter ,
43 agg_span_image_filter_rgba ,
44 agg_span_image_resample ,
45 agg_span_image_resample_rgba ,
46 agg_span_allocator ,
47 agg_image_filters ,
48 agg_gsv_text ,
49 agg_gamma_lut ,
50 interactive_polygon_ ,
51 file_utils_ ;
52
53{$I agg_mode.inc }
54
55const
56 flip_y = true;
57
58 base_shift = agg_color.base_shift;
59
60var
61 g_x1 ,
62 g_y1 ,
63 g_x2 ,
64 g_y2 : double;
65
66 global_offset : int;
67
68 g_rasterizer : rasterizer_scanline_aa;
69 g_scanline   : scanline_u8;
70
71 img_name ,p ,n ,x : shortstring;
72
73type
74 the_application = object(platform_support )
75   m_gamma_lut  : gamma_lut;
76   m_quad       : interactive_polygon;
77   m_trans_type : rbox_ctrl;
78   m_gamma      ,
79   m_blur       : slider_ctrl;
80   m_old_gamma  : double;
81
82   constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
83   destructor  Destruct;
84
85   procedure on_init; virtual;
86   procedure on_draw; virtual;
87
88   procedure on_mouse_move       (x ,y : int; flags : unsigned ); virtual;
89   procedure on_mouse_button_down(x ,y : int; flags : unsigned ); virtual;
90   procedure on_mouse_button_up  (x ,y : int; flags : unsigned ); virtual;
91
92   procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
93
94  end;
95
96{ CONSTRUCT }
97constructor the_application.Construct;
98begin
99 inherited Construct(format_ ,flip_y_ );
100
101 m_gamma_lut.Construct(2.0 ,base_shift ,base_shift );
102 m_quad.Construct     (4 ,5.0 );
103
104 m_trans_type.Construct(400 ,5.0 ,430 + 170.0 ,100.0 ,not flip_y_ );
105 m_gamma.Construct     (5.0 ,5.0 + 15 * 0 ,400-5 ,10.0 + 15 * 0 ,not flip_y_ );
106 m_blur.Construct      (5.0 ,5.0 + 15 * 1 ,400-5 ,10.0 + 15 * 1 ,not flip_y_ );
107
108 m_old_gamma:=2.0;
109
110 m_trans_type.text_size_(7 );
111 m_trans_type.add_item  ('Affine No Resample' );
112 m_trans_type.add_item  ('Affine Resample' );
113 m_trans_type.add_item  ('Perspective No Resample LERP' );
114 m_trans_type.add_item  ('Perspective No Resample Exact' );
115 m_trans_type.add_item  ('Perspective Resample LERP' );
116 m_trans_type.add_item  ('Perspective Resample Exact' );
117 m_trans_type.cur_item_ (4 );
118
119 add_ctrl(@m_trans_type );
120
121 m_gamma.range_(0.5 ,3.0 );
122 m_gamma.value_(2.0 );
123 m_gamma.label_('Gamma=%.3f' );
124
125 add_ctrl(@m_gamma );
126
127 m_blur.range_(0.5, 2.0);
128 m_blur.value_(1.0 );
129 m_blur.label_('Blur=%.3f' );
130
131 add_ctrl(@m_blur );
132
133end;
134
135{ DESTRUCT }
136destructor the_application.Destruct;
137begin
138 inherited Destruct;
139
140 m_gamma_lut.Destruct;
141 m_quad.Destruct;
142
143 m_trans_type.Destruct;
144 m_gamma.Destruct;
145 m_blur.Destruct;
146
147end;
148
149{ ON_INIT }
150procedure the_application.on_init;
151var
152 x1 ,y1 ,x2 ,y2 ,dx ,dy : double;
153
154 pixf : pixel_formats;
155
156begin
157 g_x1:=0.0;
158 g_y1:=0.0;
159 g_x2:=rbuf_img(0 )._width;
160 g_y2:=rbuf_img(0 )._height;
161
162 x1:=g_x1;// * 100.0;
163 y1:=g_y1;// * 100.0;
164 x2:=g_x2;// * 100.0;
165 y2:=g_y2;// * 100.0;
166
167 dx:=_width  / 2.0 - (x2 - x1 ) / 2.0;
168 dy:=_height / 2.0 - (y2 - y1 ) / 2.0;
169
170 m_quad.xn_ptr(0 )^:=Floor(x1 + dx );
171 m_quad.yn_ptr(0 )^:=Floor(y1 + dy );// - 150;
172 m_quad.xn_ptr(1 )^:=Floor(x2 + dx );
173 m_quad.yn_ptr(1 )^:=Floor(y1 + dy );// - 110;
174 m_quad.xn_ptr(2 )^:=Floor(x2 + dx );
175 m_quad.yn_ptr(2 )^:=Floor(y2 + dy );// - 300;
176 m_quad.xn_ptr(3 )^:=Floor(x1 + dx );
177 m_quad.yn_ptr(3 )^:=Floor(y2 + dy );// - 200;
178
179 pixfmt_bgra32(pixf ,rbuf_img(0 ) );
180
181 pixf.apply_gamma_dir(@m_gamma_lut ,bgra_order );
182
183end;
184
185{ ON_DRAW }
186procedure the_application.on_draw;
187var
188 pixf ,pixf_pre : pixel_formats;
189
190 rb ,rb_pre : renderer_base;
191
192 rgba : aggclr;
193
194 r : renderer_scanline_aa_solid;
195 b : int;
196
197 sa : span_allocator;
198 tr : trans_affine;
199 sg : span_image_filter_ptr;
200 ri : renderer_scanline_aa;
201
202 trp : trans_perspective23;
203
204 interpolator   : span_interpolator_linear;
205 interpsubdiv   : span_interpolator_linear_subdiv;
206 interp_trans   : span_interpolator_trans;
207 interp_plerp   : span_interpolator_persp_lerp;
208 interp_exact   : span_interpolator_persp_exact;
209 subdiv_adaptor : span_subdiv_adaptor;
210
211 filter_kernel : image_filter_hanning;
212 filter        : image_filter_lut;
213
214 tm : double;
215 buf : array[0..63 ] of char;
216 t   : gsv_text;
217 pt  : conv_stroke;
218
219begin
220 sg:=NIL;
221
222 if m_gamma._value <> m_old_gamma then
223  begin
224   m_gamma_lut.gamma_(m_gamma._value );
225
226   load_img(0 ,img_name );
227
228   pixfmt_bgra32(pixf ,rbuf_img(0 ) );
229
230   pixf.apply_gamma_dir(@m_gamma_lut ,bgra_order );
231
232   m_old_gamma:=m_gamma._value;
233
234  end;
235
236// Initialize structures
237 pixfmt_bgra32    (pixf ,rbuf_window );
238 pixfmt_bgra32_pre(pixf_pre ,rbuf_window );
239
240 rb.Construct    (@pixf );
241 rb_pre.Construct(@pixf_pre );
242
243 r.Construct(@rb );
244
245 rgba.ConstrDbl(1 ,1 ,1 );
246 rb.clear      (@rgba );
247
248 if m_trans_type._cur_item < 2 then
249  begin
250  // For the affine parallelogram transformations we
251  // calculate the 4-th (implicit) point of the parallelogram
252   m_quad.xn_ptr(3 )^:=m_quad.xn(0 ) + (m_quad.xn(2 ) - m_quad.xn(1 ) );
253   m_quad.yn_ptr(3 )^:=m_quad.yn(0 ) + (m_quad.yn(2 ) - m_quad.yn(1 ) );
254
255  end;
256
257// Render the "quad" tool and controls
258 g_rasterizer.add_path(@m_quad );
259
260 rgba.ConstrDbl  (0 ,0.3 ,0.5 ,0.1 );
261 r.color_        (@rgba );
262 render_scanlines(@g_rasterizer ,@g_scanline ,@r );
263
264// Prepare the polygon to rasterize. Here we need to fill
265// the destination (transformed) polygon.
266 g_rasterizer.clip_box(0 ,0 ,_width ,_height );
267 g_rasterizer.reset;
268
269 b:=0;
270
271 g_rasterizer.move_to_d(m_quad.xn(0 ) - b ,m_quad.yn(0 ) - b );
272 g_rasterizer.line_to_d(m_quad.xn(1 ) + b ,m_quad.yn(1 ) - b );
273 g_rasterizer.line_to_d(m_quad.xn(2 ) + b ,m_quad.yn(2 ) + b );
274 g_rasterizer.line_to_d(m_quad.xn(3 ) - b ,m_quad.yn(3 ) + b );
275
276 sa.Construct;
277 filter_kernel.Construct;
278 filter.Construct(@filter_kernel ,true );
279
280 rgba.ConstrPre(0 ,0 ,0 ,0 );
281
282 start_timer;
283
284 case m_trans_type._cur_item of
285  0 :
286   begin
287    tr.Construct(parallelo_ptr(m_quad.polygon ) ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
288
289    interpolator.Construct(@tr );
290
291    sg:=new(
292     span_image_filter_rgba_2x2_ptr ,
293     Construct(
294      @sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,@filter ,bgra_order ) );
295
296    ri.Construct    (@rb_pre ,sg );
297    render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
298
299   end;
300
301  1 :
302   begin
303    tr.Construct(parallelo_ptr(m_quad.polygon ) ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
304
305    interpolator.Construct(@tr );
306
307    sg:=new(
308     span_image_resample_rgba_affine_ptr ,
309     Construct(
310      @sa ,rbuf_img(0 ) ,@rgba ,@interpolator ,@filter ,bgra_order ) );
311
312    span_image_resample_ptr(sg ).blur_(m_blur._value );
313
314    ri.Construct    (@rb_pre ,sg );
315    render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
316
317   end;
318
319  2 :
320   begin
321    trp.Construct(m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
322
323    if trp.is_valid then
324     begin
325      interpsubdiv.Construct(@trp );
326
327      sg:=new(
328       span_image_filter_rgba_2x2_ptr ,
329       Construct(
330        @sa ,rbuf_img(0 ) ,@rgba ,@interpsubdiv ,@filter ,bgra_order ) );
331
332      ri.Construct    (@rb_pre ,sg );
333      render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
334
335     end;
336
337   end;
338
339  3 :
340   begin
341    trp.Construct(m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
342
343    if trp.is_valid then
344     begin
345      interp_trans.Construct(@trp );
346
347      sg:=new(
348       span_image_filter_rgba_2x2_ptr ,
349       Construct(
350        @sa ,rbuf_img(0 ) ,@rgba ,@interp_trans ,@filter ,bgra_order ) );
351
352      ri.Construct    (@rb_pre ,sg );
353      render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
354
355     end;
356
357   end;
358
359  4 :
360   begin
361    interp_plerp.Construct  (m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
362    subdiv_adaptor.Construct(@interp_plerp );
363
364    if interp_plerp.is_valid then
365     begin
366      sg:=new(
367       span_image_resample_rgba_ptr ,
368       Construct(
369        @sa ,rbuf_img(0 ) ,@rgba ,@subdiv_adaptor ,@filter ,bgra_order ) );
370
371      span_image_resample_ptr(sg ).blur_(m_blur._value );
372
373      ri.Construct    (@rb_pre ,sg );
374      render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
375
376     end;
377
378   end;
379
380  5 :
381   begin
382    interp_exact.Construct  (m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
383    subdiv_adaptor.Construct(@interp_exact );
384
385    if interp_exact.is_valid then
386     begin
387      sg:=new(
388       span_image_resample_rgba_ptr ,
389       Construct(
390        @sa ,rbuf_img(0 ) ,@rgba ,@subdiv_adaptor ,@filter ,bgra_order ) );
391
392      span_image_resample_ptr(sg ).blur_(m_blur._value );
393
394      ri.Construct    (@rb_pre ,sg );
395      render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
396
397     end;
398
399   end;
400
401 end;
402
403// Render Text
404 tm:=elapsed_time;
405
406 pixf.apply_gamma_inv(@m_gamma_lut ,bgra_order );
407
408 t.Construct;
409 t.size_(10.0 );
410
411 pt.Construct(@t );
412 pt.width_   (1.5 );
413
414 sprintf       (@buf[0 ] ,'%3.2f ms' ,tm );
415 t.start_point_(10.0 ,70.0 );
416 t.text_       (@buf[0 ] );
417
418 g_rasterizer.add_path(@pt );
419
420 rgba.ConstrDbl  (0 ,0 ,0 );
421 r.color_        (@rgba );
422 render_scanlines(@g_rasterizer ,@g_scanline ,@r );
423
424// Render the controls
425 render_ctrl(@g_rasterizer ,@g_scanline ,@r ,@m_trans_type );
426 render_ctrl(@g_rasterizer ,@g_scanline ,@r ,@m_gamma );
427 render_ctrl(@g_rasterizer ,@g_scanline ,@r ,@m_blur );
428
429// Free AGG resources
430 sa.Destruct;
431 filter.Destruct;
432
433 if sg <> NIL then
434  dispose(sg ,Destruct );
435
436 t.Destruct;
437 pt.Destruct;
438
439end;
440
441{ ON_MOUSE_MOVE }
442procedure the_application.on_mouse_move;
443begin
444 if flags and mouse_left <> 0 then
445  if m_quad.on_mouse_move(x ,y ) then
446   force_redraw;
447
448 if flags and mouse_left = 0 then
449  on_mouse_button_up(x ,y ,flags );
450
451end;
452
453{ ON_MOUSE_BUTTON_DOWN }
454procedure the_application.on_mouse_button_down;
455begin
456 if flags and mouse_left <> 0 then
457  if m_quad.on_mouse_button_down(x ,y ) then
458   force_redraw;
459
460end;
461
462{ ON_MOUSE_BUTTON_UP }
463procedure the_application.on_mouse_button_up;
464begin
465 if m_quad.on_mouse_button_up(x ,y ) then
466  force_redraw;
467
468end;
469
470{ ON_KEY }
471procedure the_application.on_key;
472var
473 cx ,cy : double;
474
475 tr  : trans_affine;
476 tar : trans_affine_rotation;
477 tat : trans_affine_translation;
478
479begin
480 if key = byte(' ' ) then
481  begin
482   cx:=(m_quad.xn(0 ) + m_quad.xn(1 ) + m_quad.xn(2 ) + m_quad.xn(3 ) ) / 4;
483   cy:=(m_quad.yn(0 ) + m_quad.yn(1 ) + m_quad.yn(2 ) + m_quad.yn(3 ) ) / 4;
484
485   tr.Construct;
486   tat.construct(-cx ,-cy );
487
488   tr:=tat;
489
490   tar.Construct(pi / 20{2.0} ); tr.multiply(@tar );
491   tat.Construct(cx ,cy ); tr.multiply(@tat );
492
493   tr.transform(@tr ,m_quad.xn_ptr(0 ) ,m_quad.yn_ptr(0 ) );
494   tr.transform(@tr ,m_quad.xn_ptr(1 ) ,m_quad.yn_ptr(1 ) );
495   tr.transform(@tr ,m_quad.xn_ptr(2 ) ,m_quad.yn_ptr(2 ) );
496   tr.transform(@tr ,m_quad.xn_ptr(3 ) ,m_quad.yn_ptr(3 ) );
497
498   force_redraw;
499
500  end;
501
502 if key = key_f1 then
503  message_(
504   'The demonstration of image transformations with resampling. '#13 +
505   'You can see the difference in quality between regular image transformers and '#13 +
506   'the ones with resampling. Of course, image tranformations with resampling work '#13 +
507   'slower because they provide the best possible quality.'#13#13 +
508   'How to play with:'#13#13 +
509   'Use the left mouse button to manipulate with image.'#13 +
510   'Press the spacebar to rotate the image by 1/20 of pi.' +
511   #13#13'Note: F2 key saves current "screenshot" file in this demo''s directory.  ' );
512
513end;
514
515VAR
516 app : the_application;
517 buf : array [0..255 ] of char;
518 ext : string[10 ];
519
520BEGIN
521 g_x1:=0;
522 g_y1:=0;
523 g_x2:=0;
524 g_y2:=0;
525
526 global_offset:=0;
527
528 g_rasterizer.Construct;
529 g_scanline.Construct;
530
531 app.Construct(pix_format_bgra32 ,flip_y );
532 app.caption_ ('AGG Example. Image Transformations with Resampling (F1-Help)' );
533
534 img_name:='spheres';
535
536{$IFDEF WIN32 }
537 if ParamCount > 0 then
538  begin
539   spread_name(ParamStr(1 ) ,p ,n ,x );
540
541   img_name:=fold_name(p ,n ,'' );
542
543  end;
544
545{$ENDIF }
546
547 if not app.load_img(0 ,img_name ) then
548  begin
549   img_name:=img_name + #0;
550   ext     :=app._img_ext + #0;
551
552   if img_name = 'spheres'#0 then
553    begin
554     sprintf(@buf[0 ]             ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
555     sprintf(@buf[StrLen(@buf ) ] ,'%s. '#13'Download http://www.antigrain.com/' ,ptrcomp(@ext[1 ] ) );
556     sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@img_name[1 ] ) );
557     sprintf(@buf[StrLen(@buf ) ] ,'%s'#13'or copy it from another directory if available.' ,ptrcomp(@ext[1 ] ) );
558
559    end
560   else
561    begin
562     sprintf(@buf[0 ]             ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
563     sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@ext[1 ] ) );
564
565    end;
566
567   app.message_(@buf[0 ] );
568
569  end
570 else
571  if app.init(600 ,600 ,window_resize ) then
572   app.run;
573
574 app.Destruct;
575
576 g_rasterizer.Destruct;
577 g_scanline.Destruct;
578
579END.