summaryrefslogtreecommitdiff
path: root/src/ui/theme.h
blob: 0713e2cec032dfe7519c4af1f113c258b6d3c55f (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */

/* Marco Theme Rendering */

/*
 * Copyright (C) 2001 Havoc Pennington
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef META_THEME_H
#define META_THEME_H

#include "boxes.h"
#include "gradient.h"
#include "common.h"
#include <gtk/gtk.h>

typedef struct _MetaFrameStyle MetaFrameStyle;
typedef struct _MetaFrameStyleSet MetaFrameStyleSet;
typedef struct _MetaDrawOp MetaDrawOp;
typedef struct _MetaDrawOpList MetaDrawOpList;
typedef struct _MetaGradientSpec MetaGradientSpec;
typedef struct _MetaAlphaGradientSpec MetaAlphaGradientSpec;
typedef struct _MetaColorSpec MetaColorSpec;
typedef struct _MetaFrameLayout MetaFrameLayout;
typedef struct _MetaButtonSpace MetaButtonSpace;
typedef struct _MetaFrameGeometry MetaFrameGeometry;
typedef struct _MetaTheme MetaTheme;
typedef struct _MetaPositionExprEnv MetaPositionExprEnv;
typedef struct _MetaDrawInfo MetaDrawInfo;

#define META_THEME_ERROR (g_quark_from_static_string ("meta-theme-error"))

typedef enum
{
  META_THEME_ERROR_FRAME_GEOMETRY,
  META_THEME_ERROR_BAD_CHARACTER,
  META_THEME_ERROR_BAD_PARENS,
  META_THEME_ERROR_UNKNOWN_VARIABLE,
  META_THEME_ERROR_DIVIDE_BY_ZERO,
  META_THEME_ERROR_MOD_ON_FLOAT,
  META_THEME_ERROR_FAILED
} MetaThemeError;

/**
 * Whether a button's size is calculated from the area around it (aspect
 * sizing) or is given as a fixed height and width in pixels (fixed sizing).
 *
 * \bug This could be done away with; see the comment at the top of
 * MetaFrameLayout.
 */
typedef enum
{
  META_BUTTON_SIZING_ASPECT,
  META_BUTTON_SIZING_FIXED,
  META_BUTTON_SIZING_LAST
} MetaButtonSizing;

/**
 * Various parameters used to calculate the geometry of a frame.
 * They are used inside a MetaFrameStyle.
 * This corresponds closely to the <frame_geometry> tag in a theme file.
 *
 * \bug button_sizing isn't really necessary, because we could easily say
 * that if button_aspect is zero, the height and width are fixed values.
 * This would also mean that MetaButtonSizing didn't need to exist, and
 * save code.
 **/
struct _MetaFrameLayout
{
  /** Reference count. */
  int refcount;

  /** Size of left side */
  int left_width;
  /** Size of right side */
  int right_width;
  /** Size of bottom side */
  int bottom_height;

  /** Invisible border */
  GtkBorder invisible_border;

  /** Border of blue title region
   * \bug (blue?!)
   **/
  GtkBorder title_border;

  /** Extra height for inside of title region, above the font height */
  int title_vertical_pad;

  /** Right indent of buttons from edges of frame */
  int right_titlebar_edge;
  /** Left indent of buttons from edges of frame */
  int left_titlebar_edge;

  /**
   * Sizing rule of buttons, either META_BUTTON_SIZING_ASPECT
   * (in which case button_aspect will be honoured, and
   * button_width and button_height set from it), or
   * META_BUTTON_SIZING_FIXED (in which case we read the width
   * and height directly).
   */
  MetaButtonSizing button_sizing;

  /**
   * Ratio of height/width. Honoured only if
   * button_sizing==META_BUTTON_SIZING_ASPECT.
   * Otherwise we figure out the height from the button_border.
   */
  double button_aspect;

  /** Width of a button; set even when we are using aspect sizing */
  int button_width;

  /** Height of a button; set even when we are using aspect sizing */
  int button_height;

  /** Space around buttons */
  GtkBorder button_border;

  /** scale factor for title text */
  double title_scale;

  /** Whether title text will be displayed */
  guint has_title : 1;

  /** Whether we should hide the buttons */
  guint hide_buttons : 1;

  /** Radius of the top left-hand corner; 0 if not rounded */
  guint top_left_corner_rounded_radius;
  /** Radius of the top right-hand corner; 0 if not rounded */
  guint top_right_corner_rounded_radius;
  /** Radius of the bottom left-hand corner; 0 if not rounded */
  guint bottom_left_corner_rounded_radius;
  /** Radius of the bottom right-hand corner; 0 if not rounded */
  guint bottom_right_corner_rounded_radius;
};

/**
 * The computed size of a button (really just a way of tying its
 * visible and clickable areas together).
 * The reason for two different rectangles here is Fitts' law & maximized
 * windows; see bug #97703 for more details.
 */
struct _MetaButtonSpace
{
  /** The screen area where the button's image is drawn */
  GdkRectangle visible;
  /** The screen area where the button can be activated by clicking */
  GdkRectangle clickable;
};

/**
 * Calculated actual geometry of the frame
 */
struct _MetaFrameGeometry
{
  int left_width;
  int right_width;
  int top_height;
  int bottom_height;

  int width;
  int height;

  GdkRectangle title_rect;

  int left_titlebar_edge;
  int right_titlebar_edge;
  int top_titlebar_edge;
  int bottom_titlebar_edge;

  /* used for a memset hack */
#define ADDRESS_OF_BUTTON_RECTS(fgeom) (((char*)(fgeom)) + G_STRUCT_OFFSET (MetaFrameGeometry, close_rect))
#define LENGTH_OF_BUTTON_RECTS (G_STRUCT_OFFSET (MetaFrameGeometry, right_single_background) + sizeof (GdkRectangle) - G_STRUCT_OFFSET (MetaFrameGeometry, close_rect))

  /* The button rects (if changed adjust memset hack) */
  MetaButtonSpace close_rect;
  MetaButtonSpace max_rect;
  MetaButtonSpace min_rect;
  MetaButtonSpace menu_rect;
  MetaButtonSpace appmenu_rect;
  MetaButtonSpace shade_rect;
  MetaButtonSpace above_rect;
  MetaButtonSpace stick_rect;
  MetaButtonSpace unshade_rect;
  MetaButtonSpace unabove_rect;
  MetaButtonSpace unstick_rect;

#define MAX_MIDDLE_BACKGROUNDS (MAX_BUTTONS_PER_CORNER - 2)
  GdkRectangle left_left_background;
  GdkRectangle left_middle_backgrounds[MAX_MIDDLE_BACKGROUNDS];
  GdkRectangle left_right_background;
  GdkRectangle left_single_background;
  GdkRectangle right_left_background;
  GdkRectangle right_middle_backgrounds[MAX_MIDDLE_BACKGROUNDS];
  GdkRectangle right_right_background;
  GdkRectangle right_single_background;
  /* End of button rects (if changed adjust memset hack) */

  /* Saved button layout */
  MetaButtonLayout button_layout;
  int n_left_buttons;
  int n_right_buttons;

  /* Round corners */
  guint top_left_corner_rounded_radius;
  guint top_right_corner_rounded_radius;
  guint bottom_left_corner_rounded_radius;
  guint bottom_right_corner_rounded_radius;
};

typedef enum
{
  META_IMAGE_FILL_SCALE, /* default, needs to be all-bits-zero for g_new0 */
  META_IMAGE_FILL_TILE
} MetaImageFillType;

typedef enum
{
  META_COLOR_SPEC_BASIC,
  META_COLOR_SPEC_GTK,
  META_COLOR_SPEC_GTK_CUSTOM,
  META_COLOR_SPEC_BLEND,
  META_COLOR_SPEC_SHADE
} MetaColorSpecType;

typedef enum
{
  META_GTK_COLOR_FG,
  META_GTK_COLOR_BG,
  META_GTK_COLOR_LIGHT,
  META_GTK_COLOR_DARK,
  META_GTK_COLOR_MID,
  META_GTK_COLOR_TEXT,
  META_GTK_COLOR_BASE,
  META_GTK_COLOR_TEXT_AA,
  META_GTK_COLOR_LAST
} MetaGtkColorComponent;

struct _MetaColorSpec
{
  MetaColorSpecType type;
  union
  {
    struct {
      GdkRGBA color;
    } basic;
    struct {
      MetaGtkColorComponent component;
      GtkStateFlags state;
    } gtk;
    struct {
      char *color_name;
      MetaColorSpec *fallback;
    } gtkcustom;
    struct {
      MetaColorSpec *foreground;
      MetaColorSpec *background;
      double alpha;
      GdkRGBA color;
    } blend;
    struct {
      MetaColorSpec *base;
      double factor;
      GdkRGBA color;
    } shade;
  } data;
};

struct _MetaGradientSpec
{
  MetaGradientType type;
  GSList *color_specs;
};

struct _MetaAlphaGradientSpec
{
  MetaGradientType type;
  unsigned char *alphas;
  int n_alphas;
};

struct _MetaDrawInfo
{
  GdkPixbuf   *mini_icon;
  GdkPixbuf   *icon;
  PangoLayout *title_layout;
  int title_layout_width;
  int title_layout_height;
  const MetaFrameGeometry *fgeom;
};

/**
 * A drawing operation in our simple vector drawing language.
 */
typedef enum
{
  /** Basic drawing-- line */
  META_DRAW_LINE,
  /** Basic drawing-- rectangle */
  META_DRAW_RECTANGLE,
  /** Basic drawing-- arc */
  META_DRAW_ARC,

  /** Clip to a rectangle */
  META_DRAW_CLIP,

  /* Texture thingies */

  /** Just a filled rectangle with alpha */
  META_DRAW_TINT,
  META_DRAW_GRADIENT,
  META_DRAW_IMAGE,

  /** GTK theme engine stuff */
  META_DRAW_GTK_ARROW,
  META_DRAW_GTK_BOX,
  META_DRAW_GTK_VLINE,

  /** App's window icon */
  META_DRAW_ICON,
  /** App's window title */
  META_DRAW_TITLE,
  /** a draw op list */
  META_DRAW_OP_LIST,
  /** tiled draw op list */
  META_DRAW_TILE
} MetaDrawType;

typedef enum
{
  POS_TOKEN_INT,
  POS_TOKEN_DOUBLE,
  POS_TOKEN_OPERATOR,
  POS_TOKEN_VARIABLE,
  POS_TOKEN_OPEN_PAREN,
  POS_TOKEN_CLOSE_PAREN
} PosTokenType;

typedef enum
{
  POS_OP_NONE,
  POS_OP_ADD,
  POS_OP_SUBTRACT,
  POS_OP_MULTIPLY,
  POS_OP_DIVIDE,
  POS_OP_MOD,
  POS_OP_MAX,
  POS_OP_MIN
} PosOperatorType;

/**
 * A token, as output by the tokeniser.
 *
 * \ingroup tokenizer
 */
typedef struct
{
  PosTokenType type;

  union
  {
    struct {
      int val;
    } i;

    struct {
      double val;
    } d;

    struct {
      PosOperatorType op;
    } o;

    struct {
      char *name;
      GQuark name_quark;
    } v;

  } d;
} PosToken;

/**
 * A computed expression in our simple vector drawing language.
 * While it appears to take the form of a tree, this is actually
 * merely a list; concerns such as precedence of operators are
 * currently recomputed on every recalculation.
 *
 * Created by meta_draw_spec_new(), destroyed by meta_draw_spec_free().
 * pos_eval() fills this with ...FIXME. Are tokens a tree or a list?
 * \ingroup parser
 */
typedef struct _MetaDrawSpec
{
  /**
   * If this spec is constant, this is the value of the constant;
   * otherwise it is zero.
   */
  int value;

  /** A list of tokens in the expression. */
  PosToken *tokens;

  /** How many tokens are in the tokens list. */
  int n_tokens;

  /** Does the expression contain any variables? */
  gboolean constant : 1;
} MetaDrawSpec;

/**
 * A single drawing operation in our simple vector drawing language.
 */
struct _MetaDrawOp
{
  MetaDrawType type;

  /* Positions are strings because they can be expressions */
  union
  {
    struct {
      MetaColorSpec *color_spec;
      int dash_on_length;
      int dash_off_length;
      int width;
      MetaDrawSpec *x1;
      MetaDrawSpec *y1;
      MetaDrawSpec *x2;
      MetaDrawSpec *y2;
    } line;

    struct {
      MetaColorSpec *color_spec;
      gboolean filled;
      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *width;
      MetaDrawSpec *height;
    } rectangle;

    struct {
      MetaColorSpec *color_spec;
      gboolean filled;
      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *width;
      MetaDrawSpec *height;
      double start_angle;
      double extent_angle;
    } arc;

    struct {
      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *width;
      MetaDrawSpec *height;
    } clip;

    struct {
      MetaColorSpec *color_spec;
      MetaAlphaGradientSpec *alpha_spec;
      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *width;
      MetaDrawSpec *height;
    } tint;

    struct {
      MetaGradientSpec *gradient_spec;
      MetaAlphaGradientSpec *alpha_spec;
      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *width;
      MetaDrawSpec *height;
    } gradient;

    struct {
      MetaColorSpec *colorize_spec;
      MetaAlphaGradientSpec *alpha_spec;
      GdkPixbuf *pixbuf;
      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *width;
      MetaDrawSpec *height;

      guint32 colorize_cache_pixel;
      GdkPixbuf *colorize_cache_pixbuf;
      MetaImageFillType fill_type;
      unsigned int vertical_stripes : 1;
      unsigned int horizontal_stripes : 1;
    } image;

    struct {
      GtkStateFlags state;
      GtkShadowType shadow;
      GtkArrowType arrow;
      gboolean filled;

      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *width;
      MetaDrawSpec *height;
    } gtk_arrow;

    struct {
      GtkStateFlags state;
      GtkShadowType shadow;
      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *width;
      MetaDrawSpec *height;
    } gtk_box;

    struct {
      GtkStateFlags state;
      MetaDrawSpec *x;
      MetaDrawSpec *y1;
      MetaDrawSpec *y2;
    } gtk_vline;

    struct {
      MetaAlphaGradientSpec *alpha_spec;
      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *width;
      MetaDrawSpec *height;
      MetaImageFillType fill_type;
    } icon;

    struct {
      MetaColorSpec *color_spec;
      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *ellipsize_width;
    } title;

    struct {
      MetaDrawOpList *op_list;
      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *width;
      MetaDrawSpec *height;
    } op_list;

    struct {
      MetaDrawOpList *op_list;
      MetaDrawSpec *x;
      MetaDrawSpec *y;
      MetaDrawSpec *width;
      MetaDrawSpec *height;
      MetaDrawSpec *tile_xoffset;
      MetaDrawSpec *tile_yoffset;
      MetaDrawSpec *tile_width;
      MetaDrawSpec *tile_height;
    } tile;

  } data;
};

/**
 * A list of MetaDrawOp objects. Maintains a reference count.
 * Grows as necessary and allows the allocation of unused spaces
 * to keep reallocations to a minimum.
 *
 * \bug Do we really win anything from not using the equivalent
 * GLib structures?
 */
struct _MetaDrawOpList
{
  int refcount;
  MetaDrawOp **ops;
  int n_ops;
  int n_allocated;
};

typedef enum
{
  META_BUTTON_STATE_NORMAL,
  META_BUTTON_STATE_PRESSED,
  META_BUTTON_STATE_PRELIGHT,
  META_BUTTON_STATE_LAST
} MetaButtonState;

typedef enum
{
  /* Ordered so that background is drawn first */
  META_BUTTON_TYPE_LEFT_LEFT_BACKGROUND,
  META_BUTTON_TYPE_LEFT_MIDDLE_BACKGROUND,
  META_BUTTON_TYPE_LEFT_RIGHT_BACKGROUND,
  META_BUTTON_TYPE_LEFT_SINGLE_BACKGROUND,
  META_BUTTON_TYPE_RIGHT_LEFT_BACKGROUND,
  META_BUTTON_TYPE_RIGHT_MIDDLE_BACKGROUND,
  META_BUTTON_TYPE_RIGHT_RIGHT_BACKGROUND,
  META_BUTTON_TYPE_RIGHT_SINGLE_BACKGROUND,
  META_BUTTON_TYPE_CLOSE,
  META_BUTTON_TYPE_MAXIMIZE,
  META_BUTTON_TYPE_MINIMIZE,
  META_BUTTON_TYPE_MENU,
  META_BUTTON_TYPE_APPMENU,
  META_BUTTON_TYPE_SHADE,
  META_BUTTON_TYPE_ABOVE,
  META_BUTTON_TYPE_STICK,
  META_BUTTON_TYPE_UNSHADE,
  META_BUTTON_TYPE_UNABOVE,
  META_BUTTON_TYPE_UNSTICK,
  META_BUTTON_TYPE_LAST
} MetaButtonType;

typedef enum
{
  META_MENU_ICON_TYPE_CLOSE,
  META_MENU_ICON_TYPE_MAXIMIZE,
  META_MENU_ICON_TYPE_UNMAXIMIZE,
  META_MENU_ICON_TYPE_MINIMIZE,
  META_MENU_ICON_TYPE_LAST
} MetaMenuIconType;

typedef enum
{
  /* Listed in the order in which the textures are drawn.
   * (though this only matters for overlaps of course.)
   * Buttons are drawn after the frame textures.
   *
   * On the corners, horizontal pieces are arbitrarily given the
   * corner area:
   *
   *   =====                 |====
   *   |                     |
   *   |       rather than   |
   *
   */

  /* entire frame */
  META_FRAME_PIECE_ENTIRE_BACKGROUND,
  /* entire titlebar background */
  META_FRAME_PIECE_TITLEBAR,
  /* portion of the titlebar background inside the titlebar
   * background edges
   */
  META_FRAME_PIECE_TITLEBAR_MIDDLE,
  /* left end of titlebar */
  META_FRAME_PIECE_LEFT_TITLEBAR_EDGE,
  /* right end of titlebar */
  META_FRAME_PIECE_RIGHT_TITLEBAR_EDGE,
  /* top edge of titlebar */
  META_FRAME_PIECE_TOP_TITLEBAR_EDGE,
  /* bottom edge of titlebar */
  META_FRAME_PIECE_BOTTOM_TITLEBAR_EDGE,
  /* render over title background (text area) */
  META_FRAME_PIECE_TITLE,
  /* left edge of the frame */
  META_FRAME_PIECE_LEFT_EDGE,
  /* right edge of the frame */
  META_FRAME_PIECE_RIGHT_EDGE,
  /* bottom edge of the frame */
  META_FRAME_PIECE_BOTTOM_EDGE,
  /* place over entire frame, after drawing everything else */
  META_FRAME_PIECE_OVERLAY,
  /* Used to get size of the enum */
  META_FRAME_PIECE_LAST
} MetaFramePiece;

/**
 * How to draw a frame in a particular state (say, a focussed, non-maximised,
 * resizable frame). This corresponds closely to the <frame_style> tag
 * in a theme file.
 */
struct _MetaFrameStyle
{
  /** Reference count. */
  int refcount;
  /**
   * Parent style.
   * Settings which are unspecified here will be taken from there.
   */
  MetaFrameStyle *parent;
  /** Operations for drawing each kind of button in each state. */
  MetaDrawOpList *buttons[META_BUTTON_TYPE_LAST][META_BUTTON_STATE_LAST];
  /** Operations for drawing each piece of the frame. */
  MetaDrawOpList *pieces[META_FRAME_PIECE_LAST];
  /**
   * Details such as the height and width of each edge, the corner rounding,
   * and the aspect ratio of the buttons.
   */
  MetaFrameLayout *layout;
  /**
   * Background colour of the window. Only present in theme formats
   * 2 and above. Can be NULL to use the standard GTK theme engine.
   */
  MetaColorSpec *window_background_color;
  /**
   * Transparency of the window background. 0=transparent; 255=opaque.
   */
  guint8 window_background_alpha;
};

/* Kinds of frame...
 *
 *  normal ->   noresize / vert only / horz only / both
 *              focused / unfocused
 *  max    ->   focused / unfocused
 *  shaded ->   focused / unfocused
 *  max/shaded -> focused / unfocused
 *
 *  so 4 states with 8 sub-states in one, 2 sub-states in the other 3,
 *  meaning 14 total
 *
 * 14 window states times 7 or 8 window types. Except some
 * window types never get a frame so that narrows it down a bit.
 *
 */
typedef enum
{
  META_FRAME_STATE_NORMAL,
  META_FRAME_STATE_MAXIMIZED,
  META_FRAME_STATE_TILED_LEFT,
  META_FRAME_STATE_TILED_RIGHT,
  META_FRAME_STATE_SHADED,
  META_FRAME_STATE_MAXIMIZED_AND_SHADED,
  META_FRAME_STATE_TILED_LEFT_AND_SHADED,
  META_FRAME_STATE_TILED_RIGHT_AND_SHADED,
  META_FRAME_STATE_LAST
} MetaFrameState;

typedef enum
{
  META_FRAME_RESIZE_NONE,
  META_FRAME_RESIZE_VERTICAL,
  META_FRAME_RESIZE_HORIZONTAL,
  META_FRAME_RESIZE_BOTH,
  META_FRAME_RESIZE_LAST
} MetaFrameResize;

typedef enum
{
  META_FRAME_FOCUS_NO,
  META_FRAME_FOCUS_YES,
  META_FRAME_FOCUS_LAST
} MetaFrameFocus;

/**
 * How to draw frames at different times: when it's maximised or not, shaded
 * or not, when it's focussed or not, and (for non-maximised windows), when
 * it can be horizontally or vertically resized, both, or neither.
 * Not all window types actually get a frame.
 *
 * A theme contains one of these objects for each type of window (each
 * MetaFrameType), that is, normal, dialogue (modal and non-modal), etc.
 *
 * This corresponds closely to the <frame_style_set> tag in a theme file.
 */
struct _MetaFrameStyleSet
{
  int refcount;
  MetaFrameStyleSet *parent;
  MetaFrameStyle *normal_styles[META_FRAME_RESIZE_LAST][META_FRAME_FOCUS_LAST];
  MetaFrameStyle *maximized_styles[META_FRAME_FOCUS_LAST];
  MetaFrameStyle *tiled_left_styles[META_FRAME_FOCUS_LAST];
  MetaFrameStyle *tiled_right_styles[META_FRAME_FOCUS_LAST];
  MetaFrameStyle *shaded_styles[META_FRAME_RESIZE_LAST][META_FRAME_FOCUS_LAST];
  MetaFrameStyle *maximized_and_shaded_styles[META_FRAME_FOCUS_LAST];
  MetaFrameStyle *tiled_left_and_shaded_styles[META_FRAME_FOCUS_LAST];
  MetaFrameStyle *tiled_right_and_shaded_styles[META_FRAME_FOCUS_LAST];
};

/**
 * A theme. This is a singleton class which groups all settings from a theme
 * on disk together.
 *
 * \bug It is rather useless to keep the metadata fields in core, I think.
 */
struct _MetaTheme
{
  /** Name of the theme (on disk), e.g. "Crux" */
  char *name;
  /** Path to the files associated with the theme */
  char *dirname;
  /**
   * Filename of the XML theme file.
   * \bug Kept lying around for no discernable reason.
   */
  char *filename;
  /** Metadata: Human-readable name of the theme. */
  char *readable_name;
  /** Metadata: Author of the theme. */
  char *author;
  /** Metadata: Copyright holder. */
  char *copyright;
  /** Metadata: Date of the theme. */
  char *date;
  /** Metadata: Description of the theme. */
  char *description;
  /** Version of the theme format. Older versions cannot use the features
   * of newer versions even if they think they can (this is to allow forward
   * and backward compatibility.
   */
  guint format_version;

  /** Symbol table of integer constants. */
  GHashTable *integer_constants;
  /** Symbol table of float constants. */
  GHashTable *float_constants;
  /**
   * Symbol table of colour constants (hex triples, and triples
   * plus alpha).
   * */
  GHashTable *color_constants;
  GHashTable *images_by_filename;
  GHashTable *layouts_by_name;
  GHashTable *draw_op_lists_by_name;
  GHashTable *styles_by_name;
  GHashTable *style_sets_by_name;
  MetaFrameStyleSet *style_sets_by_type[META_FRAME_TYPE_LAST];

  GQuark quark_width;
  GQuark quark_height;
  GQuark quark_object_width;
  GQuark quark_object_height;
  GQuark quark_left_width;
  GQuark quark_right_width;
  GQuark quark_top_height;
  GQuark quark_bottom_height;
  GQuark quark_mini_icon_width;
  GQuark quark_mini_icon_height;
  GQuark quark_icon_width;
  GQuark quark_icon_height;
  GQuark quark_title_width;
  GQuark quark_title_height;
  GQuark quark_frame_x_center;
  GQuark quark_frame_y_center;
};

struct _MetaPositionExprEnv
{
  MetaRectangle rect;
  /* size of an object being drawn, if it has a natural size */
  int object_width;
  int object_height;
  /* global object sizes, always available */
  int left_width;
  int right_width;
  int top_height;
  int bottom_height;
  int title_width;
  int title_height;
  int frame_x_center;
  int frame_y_center;
  int mini_icon_width;
  int mini_icon_height;
  int icon_width;
  int icon_height;
  /* Theme so we can look up constants */
  MetaTheme *theme;
};

MetaFrameLayout* meta_frame_layout_new           (void);
MetaFrameLayout* meta_frame_layout_copy          (const MetaFrameLayout *src);
void             meta_frame_layout_ref           (MetaFrameLayout       *layout);
void             meta_frame_layout_unref         (MetaFrameLayout       *layout);
void             meta_frame_layout_get_borders   (const MetaFrameLayout *layout,
                                                  int                    text_height,
                                                  MetaFrameFlags         flags,
                                                  int                   *top_height,
                                                  int                   *bottom_height,
                                                  int                   *left_width,
                                                  int                   *right_width);
void             meta_frame_layout_calc_geometry (const MetaFrameLayout  *layout,
                                                  int                     text_height,
                                                  MetaFrameFlags          flags,
                                                  int                     client_width,
                                                  int                     client_height,
                                                  const MetaButtonLayout *button_layout,
                                                  MetaFrameGeometry      *fgeom,
                                                  MetaTheme              *theme);

gboolean         meta_frame_layout_validate      (const MetaFrameLayout *layout,
                                                  GError               **error);

gboolean meta_parse_position_expression (MetaDrawSpec               *spec,
                                         const MetaPositionExprEnv  *env,
                                         int                        *x_return,
                                         int                        *y_return,
                                         GError                    **err);
gboolean meta_parse_size_expression     (MetaDrawSpec               *spec,
                                         const MetaPositionExprEnv  *env,
                                         int                        *val_return,
                                         GError                    **err);

MetaDrawSpec* meta_draw_spec_new (MetaTheme  *theme,
                                  const char *expr,
                                  GError    **error);
void          meta_draw_spec_free (MetaDrawSpec *spec);

MetaColorSpec* meta_color_spec_new             (MetaColorSpecType  type);
MetaColorSpec* meta_color_spec_new_from_string (const char        *str,
                                                GError           **err);
MetaColorSpec* meta_color_spec_new_gtk         (MetaGtkColorComponent component,
                                                GtkStateFlags         state);
void           meta_color_spec_free            (MetaColorSpec     *spec);
void           meta_color_spec_render          (MetaColorSpec     *spec,
                                                GtkStyleContext   *style_gtk,
                                                GdkRGBA           *color);

MetaDrawOp*    meta_draw_op_new  (MetaDrawType        type);
void           meta_draw_op_free (MetaDrawOp          *op);
void           meta_draw_op_draw (const MetaDrawOp    *op,
                                  GtkWidget           *widget,
                                  cairo_t             *cr,
                                  const MetaDrawInfo  *info,
                                  /* logical region being drawn */
                                  MetaRectangle        logical_region);

void           meta_draw_op_draw_with_style (const MetaDrawOp    *op,
                                             GtkStyleContext     *style_gtk,
                                             cairo_t             *cr,
                                             const MetaDrawInfo  *info,
                                             /* logical region being drawn */
                                             MetaRectangle        logical_region);

MetaDrawOpList* meta_draw_op_list_new   (int                   n_preallocs);
void            meta_draw_op_list_ref   (MetaDrawOpList       *op_list);
void            meta_draw_op_list_unref (MetaDrawOpList       *op_list);
void            meta_draw_op_list_draw  (const MetaDrawOpList *op_list,
                                         GtkWidget            *widget,
                                         cairo_t              *cr,
                                         const MetaDrawInfo   *info,
                                         MetaRectangle         rect);
void            meta_draw_op_list_draw_with_style  (const MetaDrawOpList *op_list,
                                                    GtkStyleContext      *style_gtk,
                                                    cairo_t              *cr,
                                                    const MetaDrawInfo   *info,
                                                    MetaRectangle         rect);
void           meta_draw_op_list_append (MetaDrawOpList       *op_list,
                                         MetaDrawOp           *op);
gboolean       meta_draw_op_list_validate (MetaDrawOpList    *op_list,
                                           GError           **error);
gboolean       meta_draw_op_list_contains (MetaDrawOpList    *op_list,
                                           MetaDrawOpList    *child);

MetaGradientSpec* meta_gradient_spec_new    (MetaGradientType        type);
void              meta_gradient_spec_free   (MetaGradientSpec       *desc);
GdkPixbuf*        meta_gradient_spec_render (const MetaGradientSpec *desc,
                                             GtkStyleContext        *style_gtk,
                                             int                     width,
                                             int                     height);
gboolean          meta_gradient_spec_validate (MetaGradientSpec     *spec,
                                               GError              **error);

MetaAlphaGradientSpec* meta_alpha_gradient_spec_new  (MetaGradientType       type,
                                                      int                    n_alphas);
void                   meta_alpha_gradient_spec_free (MetaAlphaGradientSpec *spec);


MetaFrameStyle* meta_frame_style_new   (MetaFrameStyle *parent);
void            meta_frame_style_ref   (MetaFrameStyle *style);
void            meta_frame_style_unref (MetaFrameStyle *style);

void meta_frame_style_draw (MetaFrameStyle          *style,
                            GtkWidget               *widget,
                            cairo_t                 *cr,
                            const MetaFrameGeometry *fgeom,
                            int                      client_width,
                            int                      client_height,
                            PangoLayout             *title_layout,
                            int                      text_height,
                            MetaButtonState          button_states[META_BUTTON_TYPE_LAST],
                            GdkPixbuf               *mini_icon,
                            GdkPixbuf               *icon);


void meta_frame_style_draw_with_style (MetaFrameStyle          *style,
                                       GtkStyleContext         *style_gtk,
                                       cairo_t                 *cr,
                                       const MetaFrameGeometry *fgeom,
                                       int                      client_width,
                                       int                      client_height,
                                       PangoLayout             *title_layout,
                                       int                      text_height,
                                       MetaButtonState          button_states[META_BUTTON_TYPE_LAST],
                                       GdkPixbuf               *mini_icon,
                                       GdkPixbuf               *icon);


gboolean       meta_frame_style_validate (MetaFrameStyle    *style,
                                          guint              current_theme_version,
                                          GError           **error);

MetaFrameStyleSet* meta_frame_style_set_new   (MetaFrameStyleSet *parent);
void               meta_frame_style_set_ref   (MetaFrameStyleSet *style_set);
void               meta_frame_style_set_unref (MetaFrameStyleSet *style_set);

gboolean       meta_frame_style_set_validate  (MetaFrameStyleSet *style_set,
                                               GError           **error);

MetaTheme* meta_theme_get_current (void);
void       meta_theme_set_current (const char *name,
                                   gboolean    force_reload);

MetaTheme* meta_theme_new      (void);
void       meta_theme_free     (MetaTheme *theme);
gboolean   meta_theme_validate (MetaTheme *theme,
                                GError   **error);
GdkPixbuf* meta_theme_load_image (MetaTheme  *theme,
                                  const char *filename,
                                  guint       size_of_theme_icons,
                                  GError    **error);

MetaFrameStyle* meta_theme_get_frame_style (MetaTheme     *theme,
                                            MetaFrameType  type,
                                            MetaFrameFlags flags);

double meta_theme_get_title_scale (MetaTheme     *theme,
                                   MetaFrameType  type,
                                   MetaFrameFlags flags);

void meta_theme_draw_frame (MetaTheme              *theme,
                            GtkWidget              *widget,
                            cairo_t                *cr,
                            MetaFrameType           type,
                            MetaFrameFlags          flags,
                            int                     client_width,
                            int                     client_height,
                            PangoLayout            *title_layout,
                            int                     text_height,
                            const MetaButtonLayout *button_layout,
                            MetaButtonState         button_states[META_BUTTON_TYPE_LAST],
                            GdkPixbuf              *mini_icon,
                            GdkPixbuf              *icon);

void meta_theme_draw_frame_by_name (MetaTheme              *theme,
                                    GtkWidget              *widget,
                                    cairo_t                *cr,
                                    const gchar             *style_name,
                                    MetaFrameFlags          flags,
                                    int                     client_width,
                                    int                     client_height,
                                    PangoLayout            *title_layout,
                                    int                     text_height,
                                    const MetaButtonLayout *button_layout,
                                    MetaButtonState         button_states[META_BUTTON_TYPE_LAST],
                                    GdkPixbuf              *mini_icon,
                                    GdkPixbuf              *icon);

void meta_theme_draw_frame_with_style (MetaTheme              *theme,
                                       GtkStyleContext        *style_gtk,
                                       cairo_t                *cr,
                                       MetaFrameType           type,
                                       MetaFrameFlags          flags,
                                       int                     client_width,
                                       int                     client_height,
                                       PangoLayout            *title_layout,
                                       int                     text_height,
                                       const MetaButtonLayout *button_layout,
                                       MetaButtonState         button_states[META_BUTTON_TYPE_LAST],
                                       GdkPixbuf              *mini_icon,
                                       GdkPixbuf              *icon);

void meta_theme_get_frame_borders (MetaTheme         *theme,
                                   MetaFrameType      type,
                                   int                text_height,
                                   MetaFrameFlags     flags,
                                   int               *top_height,
                                   int               *bottom_height,
                                   int               *left_width,
                                   int               *right_width);
void meta_theme_calc_geometry (MetaTheme              *theme,
                               MetaFrameType           type,
                               int                     text_height,
                               MetaFrameFlags          flags,
                               int                     client_width,
                               int                     client_height,
                               const MetaButtonLayout *button_layout,
                               MetaFrameGeometry      *fgeom);

MetaFrameLayout*   meta_theme_lookup_layout       (MetaTheme         *theme,
                                                   const char        *name);
void               meta_theme_insert_layout       (MetaTheme         *theme,
                                                   const char        *name,
                                                   MetaFrameLayout   *layout);
MetaDrawOpList*    meta_theme_lookup_draw_op_list (MetaTheme         *theme,
                                                   const char        *name);
void               meta_theme_insert_draw_op_list (MetaTheme         *theme,
                                                   const char        *name,
                                                   MetaDrawOpList    *op_list);
MetaFrameStyle*    meta_theme_lookup_style        (MetaTheme         *theme,
                                                   const char        *name);
void               meta_theme_insert_style        (MetaTheme         *theme,
                                                   const char        *name,
                                                   MetaFrameStyle    *style);
MetaFrameStyleSet* meta_theme_lookup_style_set    (MetaTheme         *theme,
                                                   const char        *name);
void               meta_theme_insert_style_set    (MetaTheme         *theme,
                                                   const char        *name,
                                                   MetaFrameStyleSet *style_set);
gboolean meta_theme_define_int_constant   (MetaTheme   *theme,
                                           const char  *name,
                                           int          value,
                                           GError     **error);
gboolean meta_theme_lookup_int_constant   (MetaTheme   *theme,
                                           const char  *name,
                                           int         *value);
gboolean meta_theme_define_float_constant (MetaTheme   *theme,
                                           const char  *name,
                                           double       value,
                                           GError     **error);
gboolean meta_theme_lookup_float_constant (MetaTheme   *theme,
                                           const char  *name,
                                           double      *value);

gboolean meta_theme_define_color_constant (MetaTheme   *theme,
                                           const char  *name,
                                           const char  *value,
                                           GError     **error);
gboolean meta_theme_lookup_color_constant (MetaTheme   *theme,
                                           const char  *name,
                                           char       **value);

gboolean     meta_theme_replace_constants     (MetaTheme    *theme,
                                               PosToken     *tokens,
                                               int           n_tokens,
                                               GError      **err);

/* random stuff */

PangoFontDescription* meta_gtk_widget_get_font_desc        (GtkWidget            *widget,
                                                            double                scale,
							    const PangoFontDescription *override);
int                   meta_pango_font_desc_get_text_height (const PangoFontDescription *font_desc,
                                                            PangoContext         *context);


/* Enum converters */
MetaGtkColorComponent meta_color_component_from_string (const char            *str);
const char*           meta_color_component_to_string   (MetaGtkColorComponent  component);
MetaButtonState       meta_button_state_from_string    (const char            *str);
const char*           meta_button_state_to_string      (MetaButtonState        state);
MetaButtonType        meta_button_type_from_string     (const char            *str,
                                                        MetaTheme             *theme);
const char*           meta_button_type_to_string       (MetaButtonType         type);
MetaFramePiece        meta_frame_piece_from_string     (const char            *str);
const char*           meta_frame_piece_to_string       (MetaFramePiece         piece);
MetaFrameState        meta_frame_state_from_string     (const char            *str);
const char*           meta_frame_state_to_string       (MetaFrameState         state);
MetaFrameResize       meta_frame_resize_from_string    (const char            *str);
const char*           meta_frame_resize_to_string      (MetaFrameResize        resize);
MetaFrameFocus        meta_frame_focus_from_string     (const char            *str);
const char*           meta_frame_focus_to_string       (MetaFrameFocus         focus);
MetaFrameType         meta_frame_type_from_string      (const char            *str);
const char*           meta_frame_type_to_string        (MetaFrameType          type);
MetaGradientType      meta_gradient_type_from_string   (const char            *str);
const char*           meta_gradient_type_to_string     (MetaGradientType       type);
GtkStateFlags         meta_gtk_state_from_string       (const char            *str);
GtkShadowType         meta_gtk_shadow_from_string      (const char            *str);
const char*           meta_gtk_shadow_to_string        (GtkShadowType          shadow);
GtkArrowType          meta_gtk_arrow_from_string       (const char            *str);
const char*           meta_gtk_arrow_to_string         (GtkArrowType           arrow);
MetaImageFillType     meta_image_fill_type_from_string (const char            *str);
const char*           meta_image_fill_type_to_string   (MetaImageFillType      fill_type);
void                  meta_gtk_style_get_light_color   (GtkStyleContext      *style,
                                                        GtkStateFlags         state,
                                                        GdkRGBA              *color);
void                  meta_gtk_style_get_dark_color    (GtkStyleContext      *style,
                                                        GtkStateFlags         state,
                                                        GdkRGBA              *color);

guint meta_theme_earliest_version_with_button (MetaButtonType type);


#define META_THEME_ALLOWS(theme, feature) (theme->format_version >= feature)

/* What version of the theme file format were various features introduced in? */
#define META_THEME_SHADE_STICK_ABOVE_BUTTONS 2
#define META_THEME_UBIQUITOUS_CONSTANTS 2
#define META_THEME_VARIED_ROUND_CORNERS 2
#define META_THEME_IMAGES_FROM_ICON_THEMES 2
#define META_THEME_UNRESIZABLE_SHADED_STYLES 2
#define META_THEME_DEGREES_IN_ARCS 2
#define META_THEME_HIDDEN_BUTTONS 2
#define META_THEME_COLOR_CONSTANTS 2
#define META_THEME_FRAME_BACKGROUNDS 2

#endif