/
gimpcairo-wilber.c
1012 lines (818 loc) · 27.4 KB
/
gimpcairo-wilber.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Wilber Cairo rendering
* Copyright (C) 2008 Sven Neumann <sven@gimp.org>
*
* Some code here is based on code from librsvg that was originally
* written by Raph Levien <raph@artofcode.com> for Gill.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "widgets-types.h"
#include "gimpcairo-wilber.h"
static void gimp_cairo_wilber_internal (GtkWidget *widget,
cairo_t *cr,
gdouble x,
gdouble y,
gdouble factor,
gdouble max_eye_angle);
static void gimp_cairo_eyes (GtkWidget *widget,
cairo_t *cr,
gdouble x,
gdouble y,
gdouble factor,
gdouble max_eye_angle);
static gboolean pointer_eyes = FALSE;
static GSList *cairo_wilber_widgets = NULL;
void
gimp_cairo_wilber_toggle_pointer_eyes (void)
{
GSList *iter;
pointer_eyes = ! pointer_eyes;
for (iter = cairo_wilber_widgets; iter; iter = g_slist_next (iter))
{
if (pointer_eyes)
g_object_set_data (G_OBJECT (iter->data), "wilber-eyes-state", NULL);
gtk_widget_queue_draw (GTK_WIDGET (iter->data));
}
}
void
gimp_cairo_draw_toolbox_wilber (GtkWidget *widget,
cairo_t *cr)
{
GtkStyleContext *context;
GtkAllocation allocation;
GdkRGBA color;
gdouble wilber_width;
gdouble wilber_height;
gdouble factor;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (cr != NULL);
context = gtk_widget_get_style_context (widget);
gtk_widget_get_allocation (widget, &allocation);
gimp_cairo_wilber_get_size (cr, &wilber_width, &wilber_height);
factor = allocation.width / wilber_width * 0.9;
if (! gtk_widget_get_has_window (widget))
cairo_translate (cr, allocation.x, allocation.y);
cairo_scale (cr, factor, factor);
gimp_cairo_wilber_internal (widget, cr,
(allocation.width / factor - wilber_width) / 2.0,
(allocation.height / factor - wilber_height) / 2.0,
factor, 30.0 * G_PI / 180.0);
gtk_style_context_get_color (context, gtk_widget_get_state_flags (widget),
&color);
color.alpha = 0.1;
gdk_cairo_set_source_rgba (cr, &color);
cairo_fill (cr);
}
void
gimp_cairo_draw_drop_wilber (GtkWidget *widget,
cairo_t *cr,
gboolean blink)
{
GtkStyleContext *context;
GtkAllocation allocation;
GdkRGBA color;
gdouble wilber_width;
gdouble wilber_height;
gdouble width;
gdouble height;
gdouble side;
gdouble factor;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (cr != NULL);
context = gtk_widget_get_style_context (widget);
gtk_widget_get_allocation (widget, &allocation);
gimp_cairo_wilber_get_size (cr, &wilber_width, &wilber_height);
wilber_width /= 2;
wilber_height /= 2;
side = MIN (MIN (allocation.width, allocation.height),
MAX (allocation.width, allocation.height) / 2);
width = MAX (wilber_width, side);
height = MAX (wilber_height, side);
factor = MIN (width / wilber_width, height / wilber_height);
if (! gtk_widget_get_has_window (widget))
cairo_translate (cr, allocation.x, allocation.y);
cairo_scale (cr, factor, factor);
/* magic factors depend on the image used, everything else is generic
*/
gimp_cairo_wilber_internal (widget, cr,
- wilber_width * 0.6,
allocation.height / factor - wilber_height * 1.1,
factor, 50.0 * G_PI / 180.0);
gtk_style_context_get_color (context, gtk_widget_get_state_flags (widget),
&color);
color.alpha = 0.15;
gdk_cairo_set_source_rgba (cr, &color);
cairo_fill (cr);
if (blink)
{
gimp_cairo_eyes (widget, cr,
- wilber_width * 0.6,
allocation.height / factor - wilber_height * 1.1,
factor, 50.0 * G_PI / 180.0);
cairo_set_source_rgba (cr,
color.red,
0,
0,
1.0);
cairo_fill (cr);
}
}
/* This string is a path description as found in SVG files. You can
* use Inkscape to create the SVG file, then copy the path from it.
* It works best if you combine all paths into one. Inkscape has a
* function to do that.
*/
static const gchar wilber_path[] =
"M 509.72445,438.68864 C 501.47706,469.77945 464.95038,491.54566 431.85915,497.74874 C 438.5216,503.01688 442.87782,511.227 442.87782,520.37375 C 442.87783,536.24746 429.95607,549.0223 414.08235,549.0223 C 398.20863,549.0223 385.28688,536.24746 385.28688,520.37375 C 385.28688,511.52403 389.27666,503.61286 395.57098,498.3364 C 359.36952,495.90384 343.70976,463.95812 343.70975,463.95814 L 342.68134,509.64891 C 342.68134,514.35021 342.08391,519.96098 340.18378,528.3072 C 339.84664,527.80364 339.51399,527.33515 339.15537,526.83804 C 330.25511,514.5011 317.25269,507.81431 306.39317,508.76741 C 302.77334,509.08511 299.47017,510.33348 296.54982,512.4403 C 284.86847,520.86757 284.97665,540.94721 296.84366,557.3965 C 306.96274,571.42287 322.32232,578.25612 333.8664,574.73254 C 391.94635,615.17624 532.16931,642.41915 509.72445,438.68864 z M 363.24953,501.1278 C 373.83202,501.12778 382.49549,509.79127 382.49549,520.37375 C 382.49549,530.95624 373.83201,539.47279 363.24953,539.47279 C 352.66706,539.47279 344.1505,530.95624 344.1505,520.37375 C 344.15049,509.79129 352.66706,501.1278 363.24953,501.1278 z M 305.80551,516.1132 C 311.68466,516.11318 316.38344,521.83985 316.38344,528.89486 C 316.38345,535.94982 311.68467,541.67652 305.80551,541.67652 C 299.92636,541.67652 295.08067,535.94987 295.08067,528.89486 C 295.08065,521.83985 299.92636,516.1132 305.80551,516.1132 z M 440.821,552.54828 C 440.821,552.54828 448.7504,554.02388 453.8965,559.45332 C 457.41881,563.16951 457.75208,569.15506 456.98172,577.37703 C 456.21143,573.8833 454.89571,571.76659 453.8965,569.29666 C 443.01388,582.47662 413.42981,583.08929 376.0312,569.88433 C 416.63248,578.00493 437.38806,570.56014 449.48903,561.2163 C 446.29383,557.08917 440.821,552.54828 440.821,552.54828 z ";
static const gchar eyes_path[] =
"M 434.64723,524.59684 C 434.64723,532.23974 428.44429,538.44268 420.80139,538.44268 C 413.15849,538.44268 406.95555,532.23974 406.95555,524.59684 C 406.95555,516.95394 413.15849,510.751 420.80139,510.751 C 428.44429,510.751 434.64723,516.95394 434.64723,524.59684 z M 378.00043,522.99931 C 378.00043,527.70264 374.18324,531.51984 369.47991,531.51984 C 364.77658,531.51984 360.95939,527.70264 360.95939,522.99931 C 360.95939,518.29599 364.77658,514.47879 369.47991,514.47879 C 374.18324,514.47879 378.00043,518.29599 378.00043,522.99931 z ";
static cairo_path_t *wilber_cairo_path = NULL;
static gdouble wilber_x1, wilber_y1;
static gdouble wilber_x2, wilber_y2;
static cairo_path_t *eyes_cairo_path = NULL;
static gdouble eyes_x1, eyes_y1;
static gdouble eyes_x2, eyes_y2;
static void parse_path_data (cairo_t *cr,
const gchar *data);
static void wilber_get_extents (cairo_t *cr);
static void eyes_get_extents (cairo_t *cr);
/**
* gimp_cairo_wilber:
* @cr: Cairo context
* @x: x position
* @y: y position
*
* Draw a Wilber path at position @x, @y.
*/
void
gimp_cairo_wilber (cairo_t *cr,
gdouble x,
gdouble y)
{
gimp_cairo_wilber_internal (NULL, cr, x, y, 1.0, 0.0);
}
static void
gimp_cairo_wilber_weak_notify (gpointer data,
GObject *widget)
{
cairo_wilber_widgets = g_slist_remove (cairo_wilber_widgets, widget);
}
static void
gimp_cairo_wilber_internal (GtkWidget *widget,
cairo_t *cr,
gdouble x,
gdouble y,
gdouble factor,
gdouble max_eye_angle)
{
wilber_get_extents (cr);
cairo_save (cr);
cairo_translate (cr, x - wilber_x1, y - wilber_y1);
cairo_append_path (cr, wilber_cairo_path);
cairo_restore (cr);
gimp_cairo_eyes (widget, cr, x, y, factor, max_eye_angle);
if (widget && ! g_slist_find (cairo_wilber_widgets, widget))
{
cairo_wilber_widgets = g_slist_prepend (cairo_wilber_widgets, widget);
g_object_weak_ref (G_OBJECT (widget),
gimp_cairo_wilber_weak_notify, NULL);
}
}
typedef struct
{
gdouble x;
gdouble y;
gdouble radius;
gdouble a;
gdouble b;
gdouble r;
} Eye;
static const Eye eyes[2] =
{
{ .x = (344.151 + 382.496) / 2.0,
.y = (501.128 + 539.473) / 2.0,
.radius = (382.496 - 344.151) / 2.0,
.a = 25.0 * G_PI / 180.0,
.b = 24.0 * G_PI / 180.0,
.r = 0.475
},
{ .x = (385.287 + 442.878) / 2.0,
.y = (491.431 + 549.022) / 2.0,
.radius = (442.878 - 385.287) / 2.0,
.a = 34.0 * G_PI / 180.0,
.b = 19.0 * G_PI / 180.0,
.r = 0.5
}
};
typedef struct
{
gdouble a;
gdouble b;
} EyeState;
typedef struct
{
EyeState eyes[2];
gdouble x;
gdouble y;
gdouble factor;
gdouble max_eye_angle;
gdouble t;
gint timeout_id;
} EyesState;
static EyesState *
eyes_state_new (void)
{
EyesState *state = g_slice_new0 (EyesState);
gint i;
for (i = 0; i < 2; i++)
{
state->eyes[i].a = eyes[i].a;
state->eyes[i].b = eyes[i].b;
}
state->t = (gdouble) g_get_monotonic_time () / G_TIME_SPAN_SECOND;
return state;
}
static void
eyes_state_free (EyesState *state)
{
if (state->timeout_id)
g_source_remove (state->timeout_id);
g_slice_free (EyesState, state);
}
static gboolean
gimp_cairo_pointer_eyes_timeout (GtkWidget *widget)
{
GdkSeat *seat;
EyesState *state;
gdouble t;
gint pointer_x;
gint pointer_y;
GtkAllocation allocation;
GdkWindow *window;
gint window_x;
gint window_y;
gint redraw = 2;
gint i;
state = g_object_get_data (G_OBJECT (widget), "wilber-eyes-state");
t = (gdouble) g_get_monotonic_time () / G_TIME_SPAN_SECOND;
seat = gdk_display_get_default_seat (gdk_display_get_default ());
gdk_device_get_position (gdk_seat_get_pointer (seat),
NULL, &pointer_x, &pointer_y);
gtk_widget_get_allocation (widget, &allocation);
window = gtk_widget_get_window (widget);
if (window)
gdk_window_get_origin (window, &window_x, &window_y);
for (i = 0; i < 2; i++)
{
const Eye *eye = &eyes[i];
gdouble a;
gdouble b;
gdouble c;
GimpVector3 u;
GimpVector3 v;
GimpVector3 w;
if (pointer_eyes)
{
gdouble screen_x;
gdouble screen_y;
gdouble z = 220.0 * state->factor;
gdouble d;
screen_x = (eye->x + state->x - wilber_x1) * state->factor;
screen_y = (eye->y + state->y - wilber_y1) * state->factor;
if (! gtk_widget_get_has_window (widget))
{
screen_x += allocation.x;
screen_y += allocation.y;
}
if (window)
{
screen_x += window_x;
screen_y += window_y;
}
d = sqrt (SQR (pointer_x - screen_x) + SQR (pointer_y - screen_y));
a = atan2 (pointer_y - screen_y, pointer_x - screen_x);
b = atan (d / z);
b = MIN (b, state->max_eye_angle);
}
else
{
a = eyes[i].a;
b = eyes[i].b;
}
if (a == state->eyes[i].a && b == state->eyes[i].b)
{
redraw--;
continue;
}
u.x = sin (state->eyes[i].b) * cos (state->eyes[i].a);
u.y = sin (state->eyes[i].b) * sin (state->eyes[i].a);
u.z = cos (state->eyes[i].b);
v.x = sin (b) * cos (a);
v.y = sin (b) * sin (a);
v.z = cos (b);
c = acos (gimp_vector3_inner_product (&u, &v));
if (c < 1e-2)
{
state->eyes[i].a = a;
state->eyes[i].b = b;
continue;
}
c *= 1.0 - exp (-(t - state->t) * 15.0);
w = gimp_vector3_cross_product (&u, &v);
w = gimp_vector3_cross_product (&w, &u);
gimp_vector3_normalize (&w);
v.x = u.x * cos (c) + w.x * sin (c);
v.y = u.y * cos (c) + w.y * sin (c);
v.z = u.z * cos (c) + w.z * sin (c);
a = atan2 (v.y, v.x);
b = acos (v.z);
state->eyes[i].a = a;
state->eyes[i].b = b;
}
state->t = t;
if (redraw)
{
state->timeout_id = 0;
gtk_widget_queue_draw (widget);
return G_SOURCE_REMOVE;
}
else if (! pointer_eyes)
{
state->timeout_id = 0;
g_object_set_data (G_OBJECT (widget), "wilber-eyes-state", NULL);
gtk_widget_queue_draw (widget);
return G_SOURCE_REMOVE;
}
return G_SOURCE_CONTINUE;
}
static void
gimp_cairo_pointer_eyes (GtkWidget *widget,
cairo_t *cr,
gdouble x,
gdouble y,
gdouble factor,
gdouble max_eye_angle)
{
EyesState *state;
gint i;
state = g_object_get_data (G_OBJECT (widget), "wilber-eyes-state");
if (! state)
{
state = eyes_state_new ();
g_object_set_data_full (G_OBJECT (widget), "wilber-eyes-state", state,
(GDestroyNotify) eyes_state_free);
}
for (i = 0; i < 2; i++)
{
const Eye *eye = &eyes[i];
gdouble R = eye->radius;
gdouble r = eye->r * eye->radius;
gint j;
cairo_save (cr);
cairo_translate (cr, eye->x, eye->y);
cairo_rotate (cr, state->eyes[i].a);
for (j = 0; j < 32; j++)
{
gdouble a = -2.0 * G_PI * j / 32.0;
gdouble u = r * cos (a);
gdouble v = r * sin (a);
gdouble w = sqrt (SQR (R) - SQR (v));
gdouble b = asin (u / w);
b = CLAMP (b + state->eyes[i].b, -G_PI / 2.0, +G_PI / 2.0);
u = w * sin (b);
if (j == 0)
cairo_move_to (cr, u, v);
else
cairo_line_to (cr, u, v);
}
cairo_close_path (cr);
cairo_restore (cr);
}
state->x = x;
state->y = y;
state->factor = factor;
state->max_eye_angle = max_eye_angle;
if (! state->timeout_id)
{
state->timeout_id =
g_timeout_add (17,
(GSourceFunc) gimp_cairo_pointer_eyes_timeout,
widget);
}
}
static void
gimp_cairo_eyes (GtkWidget *widget,
cairo_t *cr,
gdouble x,
gdouble y,
gdouble factor,
gdouble max_eye_angle)
{
wilber_get_extents (cr);
eyes_get_extents (cr);
cairo_save (cr);
cairo_translate (cr, x - wilber_x1, y - wilber_y1);
if (widget &&
(pointer_eyes ||
g_object_get_data (G_OBJECT (widget), "wilber-eyes-state")))
{
gimp_cairo_pointer_eyes (widget, cr, x, y, factor, max_eye_angle);
}
else
{
cairo_append_path (cr, eyes_cairo_path);
}
cairo_restore (cr);
}
void
gimp_cairo_wilber_get_size (cairo_t *cr,
gdouble *width,
gdouble *height)
{
wilber_get_extents (cr);
*width = wilber_x2 - wilber_x1;
*height = wilber_y2 - wilber_y1;
}
static void
wilber_get_extents (cairo_t *unused)
{
if (! wilber_cairo_path)
{
cairo_surface_t *s = cairo_image_surface_create (CAIRO_FORMAT_A8, 1, 1);
cairo_t *cr = cairo_create (s);
parse_path_data (cr, wilber_path);
cairo_fill_extents (cr, &wilber_x1, &wilber_y1, &wilber_x2, &wilber_y2);
wilber_cairo_path = cairo_copy_path (cr);
cairo_destroy (cr);
cairo_surface_destroy (s);
}
}
static void
eyes_get_extents (cairo_t *unused)
{
if (! eyes_cairo_path)
{
cairo_surface_t *s = cairo_image_surface_create (CAIRO_FORMAT_A8, 1, 1);
cairo_t *cr = cairo_create (s);
parse_path_data (cr, eyes_path);
cairo_fill_extents (cr, &eyes_x1, &eyes_y1, &eyes_x2, &eyes_y2);
eyes_cairo_path = cairo_copy_path (cr);
cairo_destroy (cr);
cairo_surface_destroy (s);
}
}
/**********************************************************/
/* Below is the code that parses the actual path data. */
/* */
/* This code is taken from librsvg and was originally */
/* written by Raph Levien <raph@artofcode.com> for Gill. */
/**********************************************************/
typedef struct
{
cairo_t *cr;
gdouble cpx, cpy; /* current point */
gdouble rpx, rpy; /* reflection point (for 's' and 't' commands) */
gchar cmd; /* current command (lowercase) */
gint param; /* number of parameters */
gboolean rel; /* true if relative coords */
gdouble params[7]; /* parameters that have been parsed */
} ParsePathContext;
static void parse_path_default_xy (ParsePathContext *ctx,
gint n_params);
static void parse_path_do_cmd (ParsePathContext *ctx,
gboolean final);
static void
parse_path_data (cairo_t *cr,
const gchar *data)
{
ParsePathContext ctx;
gboolean in_num = FALSE;
gboolean in_frac = FALSE;
gboolean in_exp = FALSE;
gboolean exp_wait_sign = FALSE;
gdouble val = 0.0;
gchar c = 0;
gint sign = 0;
gint exp = 0;
gint exp_sign = 0;
gdouble frac = 0.0;
gint i;
memset (&ctx, 0, sizeof (ParsePathContext));
ctx.cr = cr;
for (i = 0; ; i++)
{
c = data[i];
if (c >= '0' && c <= '9')
{
/* digit */
if (in_num)
{
if (in_exp)
{
exp = (exp * 10) + c - '0';
exp_wait_sign = FALSE;
}
else if (in_frac)
val += (frac *= 0.1) * (c - '0');
else
val = (val * 10) + c - '0';
}
else
{
in_num = TRUE;
in_frac = FALSE;
in_exp = FALSE;
exp = 0;
exp_sign = 1;
exp_wait_sign = FALSE;
val = c - '0';
sign = 1;
}
}
else if (c == '.')
{
if (!in_num)
{
in_num = TRUE;
val = 0;
}
in_frac = TRUE;
frac = 1;
}
else if ((c == 'E' || c == 'e') && in_num)
{
in_exp = TRUE;
exp_wait_sign = TRUE;
exp = 0;
exp_sign = 1;
}
else if ((c == '+' || c == '-') && in_exp)
{
exp_sign = c == '+' ? 1 : -1;
}
else if (in_num)
{
/* end of number */
val *= sign * pow (10, exp_sign * exp);
if (ctx.rel)
{
/* Handle relative coordinates. This switch statement attempts
to determine _what_ the coords are relative to. This is
underspecified in the 12 Apr working draft. */
switch (ctx.cmd)
{
case 'l':
case 'm':
case 'c':
case 's':
case 'q':
case 't':
/* rule: even-numbered params are x-relative, odd-numbered
are y-relative */
if ((ctx.param & 1) == 0)
val += ctx.cpx;
else if ((ctx.param & 1) == 1)
val += ctx.cpy;
break;
case 'a':
/* rule: sixth and seventh are x and y, rest are not
relative */
if (ctx.param == 5)
val += ctx.cpx;
else if (ctx.param == 6)
val += ctx.cpy;
break;
case 'h':
/* rule: x-relative */
val += ctx.cpx;
break;
case 'v':
/* rule: y-relative */
val += ctx.cpy;
break;
}
}
ctx.params[ctx.param++] = val;
parse_path_do_cmd (&ctx, FALSE);
in_num = FALSE;
}
if (c == '\0')
break;
else if ((c == '+' || c == '-') && !exp_wait_sign)
{
sign = c == '+' ? 1 : -1;
val = 0;
in_num = TRUE;
in_frac = FALSE;
in_exp = FALSE;
exp = 0;
exp_sign = 1;
exp_wait_sign = FALSE;
}
else if (c == 'z' || c == 'Z')
{
if (ctx.param)
parse_path_do_cmd (&ctx, TRUE);
cairo_close_path (ctx.cr);
}
else if (c >= 'A' && c <= 'Z' && c != 'E')
{
if (ctx.param)
parse_path_do_cmd (&ctx, TRUE);
ctx.cmd = c + 'a' - 'A';
ctx.rel = FALSE;
}
else if (c >= 'a' && c <= 'z' && c != 'e')
{
if (ctx.param)
parse_path_do_cmd (&ctx, TRUE);
ctx.cmd = c;
ctx.rel = TRUE;
}
/* else c _should_ be whitespace or , */
}
}
/* supply defaults for missing parameters, assuming relative coordinates
are to be interpreted as x,y */
static void
parse_path_default_xy (ParsePathContext *ctx,
gint n_params)
{
gint i;
if (ctx->rel)
{
for (i = ctx->param; i < n_params; i++)
{
if (i > 2)
ctx->params[i] = ctx->params[i - 2];
else if (i == 1)
ctx->params[i] = ctx->cpy;
else if (i == 0)
/* we shouldn't get here (ctx->param > 0 as precondition) */
ctx->params[i] = ctx->cpx;
}
}
else
{
for (i = ctx->param; i < n_params; i++)
ctx->params[i] = 0.0;
}
}
static void
parse_path_do_cmd (ParsePathContext *ctx,
gboolean final)
{
switch (ctx->cmd)
{
case 'm':
/* moveto */
if (ctx->param == 2 || final)
{
parse_path_default_xy (ctx, 2);
ctx->cpx = ctx->rpx = ctx->params[0];
ctx->cpy = ctx->rpy = ctx->params[1];
cairo_move_to (ctx->cr, ctx->cpx, ctx->cpy);
ctx->param = 0;
}
break;
case 'l':
/* lineto */
if (ctx->param == 2 || final)
{
parse_path_default_xy (ctx, 2);
ctx->cpx = ctx->rpx = ctx->params[0];
ctx->cpy = ctx->rpy = ctx->params[1];
cairo_line_to (ctx->cr, ctx->cpx, ctx->cpy);
ctx->param = 0;
}
break;
case 'c':
/* curveto */
if (ctx->param == 6 || final)
{
gdouble x, y;
parse_path_default_xy (ctx, 6);
x = ctx->params[0];
y = ctx->params[1];
ctx->rpx = ctx->params[2];
ctx->rpy = ctx->params[3];
ctx->cpx = ctx->params[4];
ctx->cpy = ctx->params[5];
cairo_curve_to (ctx->cr,
x, y, ctx->rpx, ctx->rpy, ctx->cpx, ctx->cpy);
ctx->param = 0;
}
break;
case 's':
/* smooth curveto */
if (ctx->param == 4 || final)
{
gdouble x, y;
parse_path_default_xy (ctx, 4);
x = 2 * ctx->cpx - ctx->rpx;
y = 2 * ctx->cpy - ctx->rpy;
ctx->rpx = ctx->params[0];
ctx->rpy = ctx->params[1];
ctx->cpx = ctx->params[2];
ctx->cpy = ctx->params[3];
cairo_curve_to (ctx->cr,
x, y, ctx->rpx, ctx->rpy, ctx->cpx, ctx->cpy);
ctx->param = 0;
}
break;
case 'h':
/* horizontal lineto */
if (ctx->param == 1)
{
ctx->cpx = ctx->rpx = ctx->params[0];
cairo_line_to (ctx->cr, ctx->cpx, ctx->cpy);
ctx->param = 0;
}
break;
case 'v':
/* vertical lineto */
if (ctx->param == 1)
{
ctx->cpy = ctx->rpy = ctx->params[0];
cairo_line_to (ctx->cr, ctx->cpx, ctx->cpy);
ctx->param = 0;
}
break;
case 'q':
/* quadratic bezier curveto */
if (ctx->param == 4 || final)
{
parse_path_default_xy (ctx, 4);
ctx->rpx = ctx->params[0];
ctx->rpy = ctx->params[1];
ctx->cpx = ctx->params[2];
ctx->cpy = ctx->params[3];
g_warning ("quadratic bezier curveto not implemented");
ctx->param = 0;
}
break;
case 't':
/* truetype quadratic bezier curveto */
if (ctx->param == 2 || final)
{
parse_path_default_xy (ctx, 2);
ctx->rpx = 2 * ctx->cpx - ctx->rpx;
ctx->rpy = 2 * ctx->cpy - ctx->rpy;
ctx->cpx = ctx->params[0];
ctx->cpy = ctx->params[1];
g_warning ("truetype quadratic bezier curveto not implemented");
ctx->param = 0;
}
else if (final)
{
if (ctx->param > 2)
{
parse_path_default_xy (ctx, 4);
ctx->rpx = ctx->params[0];
ctx->rpy = ctx->params[1];
ctx->cpx = ctx->params[2];
ctx->cpy = ctx->params[3];
g_warning ("conicto not implemented");
}
else
{
parse_path_default_xy (ctx, 2);
ctx->cpx = ctx->rpx = ctx->params[0];
ctx->cpy = ctx->rpy = ctx->params[1];
cairo_line_to (ctx->cr, ctx->cpx, ctx->cpy);
}
ctx->param = 0;
}
break;
case 'a':
if (ctx->param == 7 || final)
{
ctx->cpx = ctx->rpx = ctx->params[5];
ctx->cpy = ctx->rpy = ctx->params[6];