Pileus Git - ~andy/gtk/blob - gtk/gtkthemingengine.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <math.h>
  23 #include <gtk/gtk.h>
  24
  25 #include <gtk/gtkthemingengine.h>
  26 #include <gtk/gtkstylecontext.h>
  27 #include <gtk/gtkintl.h>
  28
  29 #include "gtkprivate.h"
  30 #include "gtk9slice.h"
  31 #include "gtkpango.h"
  32
  33 /**
  34  * SECTION:gtkthemingengine
  35  * @Short_description: Theming renderers
  36  * @Title: GtkThemingEngine
  37  * @See_also: #GtkStyleContext
  38  *
  39  * #GtkThemingEngine is the object used for rendering themed content
  40  * in GTK+ widgets. Even though GTK+ has a default implementation,
  41  * it can be overridden in CSS files by enforcing a #GtkThemingEngine
  42  * object to be loaded as a module.
  43  *
  44  * In order to implement a theming engine, a #GtkThemingEngine subclass
  45  * must be created, alongside the CSS file that will reference it, the
  46  * theming engine would be created as an .so library, and installed in
  47  * $(gtk-modules-dir)/theming-engines/.
  48  */
  49
  50 typedef struct GtkThemingEnginePrivate GtkThemingEnginePrivate;
  51
  52 enum {
  53   SIDE_LEFT   = 1,
  54   SIDE_BOTTOM = 1 << 1,
  55   SIDE_RIGHT  = 1 << 2,
  56   SIDE_TOP    = 1 << 3,
  57   SIDE_ALL    = 0xF
  58 };
  59
  60 enum {
  61   PROP_0,
  62   PROP_NAME
  63 };
  64
  65 struct GtkThemingEnginePrivate
  66 {
  67   GtkStyleContext *context;
  68   gchar *name;
  69 };
  70
  71 #define GTK_THEMING_ENGINE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_THEMING_ENGINE, GtkThemingEnginePrivate))
  72
  73 static void gtk_theming_engine_finalize          (GObject      *object);
  74 static void gtk_theming_engine_impl_set_property (GObject      *object,
  75                                                   guint         prop_id,
  76                                                   const GValue *value,
  77                                                   GParamSpec   *pspec);
  78 static void gtk_theming_engine_impl_get_property (GObject      *object,
  79                                                   guint         prop_id,
  80                                                   GValue       *value,
  81                                                   GParamSpec   *pspec);
  82
  83 static void gtk_theming_engine_render_check (GtkThemingEngine *engine,
  84                                              cairo_t          *cr,
  85                                              gdouble           x,
  86                                              gdouble           y,
  87                                              gdouble           width,
  88                                              gdouble           height);
  89 static void gtk_theming_engine_render_option (GtkThemingEngine *engine,
  90                                               cairo_t          *cr,
  91                                               gdouble           x,
  92                                               gdouble           y,
  93                                               gdouble           width,
  94                                               gdouble           height);
  95 static void gtk_theming_engine_render_arrow  (GtkThemingEngine *engine,
  96                                               cairo_t          *cr,
  97                                               gdouble           angle,
  98                                               gdouble           x,
  99                                               gdouble           y,
 100                                               gdouble           size);
 101 static void gtk_theming_engine_render_background (GtkThemingEngine *engine,
 102                                                   cairo_t          *cr,
 103                                                   gdouble           x,
 104                                                   gdouble           y,
 105                                                   gdouble           width,
 106                                                   gdouble           height);
 107 static void gtk_theming_engine_render_frame  (GtkThemingEngine *engine,
 108                                               cairo_t          *cr,
 109                                               gdouble           x,
 110                                               gdouble           y,
 111                                               gdouble           width,
 112                                               gdouble           height);
 113 static void gtk_theming_engine_render_expander (GtkThemingEngine *engine,
 114                                                 cairo_t          *cr,
 115                                                 gdouble           x,
 116                                                 gdouble           y,
 117                                                 gdouble           width,
 118                                                 gdouble           height);
 119 static void gtk_theming_engine_render_focus    (GtkThemingEngine *engine,
 120                                                 cairo_t          *cr,
 121                                                 gdouble           x,
 122                                                 gdouble           y,
 123                                                 gdouble           width,
 124                                                 gdouble           height);
 125 static void gtk_theming_engine_render_layout   (GtkThemingEngine *engine,
 126                                                 cairo_t          *cr,
 127                                                 gdouble           x,
 128                                                 gdouble           y,
 129                                                 PangoLayout      *layout);
 130 static void gtk_theming_engine_render_line     (GtkThemingEngine *engine,
 131                                                 cairo_t          *cr,
 132                                                 gdouble           x0,
 133                                                 gdouble           y0,
 134                                                 gdouble           x1,
 135                                                 gdouble           y1);
 136 static void gtk_theming_engine_render_slider   (GtkThemingEngine *engine,
 137                                                 cairo_t          *cr,
 138                                                 gdouble           x,
 139                                                 gdouble           y,
 140                                                 gdouble           width,
 141                                                 gdouble           height,
 142                                                 GtkOrientation    orientation);
 143 static void gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
 144                                                  cairo_t          *cr,
 145                                                  gdouble           x,
 146                                                  gdouble           y,
 147                                                  gdouble           width,
 148                                                  gdouble           height,
 149                                                  GtkPositionType   gap_side,
 150                                                  gdouble           xy0_gap,
 151                                                  gdouble           xy1_gap);
 152 static void gtk_theming_engine_render_extension (GtkThemingEngine *engine,
 153                                                  cairo_t          *cr,
 154                                                  gdouble           x,
 155                                                  gdouble           y,
 156                                                  gdouble           width,
 157                                                  gdouble           height,
 158                                                  GtkPositionType   gap_side);
 159 static void gtk_theming_engine_render_handle    (GtkThemingEngine *engine,
 160                                                  cairo_t          *cr,
 161                                                  gdouble           x,
 162                                                  gdouble           y,
 163                                                  gdouble           width,
 164                                                  gdouble           height);
 165 static void gtk_theming_engine_render_activity  (GtkThemingEngine *engine,
 166                                                  cairo_t          *cr,
 167                                                  gdouble           x,
 168                                                  gdouble           y,
 169                                                  gdouble           width,
 170                                                  gdouble           height);
 171
 172 G_DEFINE_TYPE (GtkThemingEngine, gtk_theming_engine, G_TYPE_OBJECT)
 173
 174
 175 typedef struct GtkThemingModule GtkThemingModule;
 176 typedef struct GtkThemingModuleClass GtkThemingModuleClass;
 177
 178 struct GtkThemingModule
 179 {
 180   GTypeModule parent_instance;
 181   GModule *module;
 182   gchar *name;
 183
 184   void (*init) (GTypeModule *module);
 185   void (*exit) (void);
 186   GtkThemingEngine * (*create_engine) (void);
 187 };
 188
 189 struct GtkThemingModuleClass
 190 {
 191   GTypeModuleClass parent_class;
 192 };
 193
 194 #define GTK_TYPE_THEMING_MODULE  (gtk_theming_module_get_type ())
 195 #define GTK_THEMING_MODULE(o)    (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_THEMING_MODULE, GtkThemingModule))
 196 #define GTK_IS_THEMING_MODULE(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_THEMING_MODULE))
 197
 198 G_DEFINE_TYPE (GtkThemingModule, gtk_theming_module, G_TYPE_TYPE_MODULE);
 199
 200 static void
 201 gtk_theming_engine_class_init (GtkThemingEngineClass *klass)
 202 {
 203   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 204
 205   object_class->finalize = gtk_theming_engine_finalize;
 206   object_class->set_property = gtk_theming_engine_impl_set_property;
 207   object_class->get_property = gtk_theming_engine_impl_get_property;
 208
 209   klass->render_check = gtk_theming_engine_render_check;
 210   klass->render_option = gtk_theming_engine_render_option;
 211   klass->render_arrow = gtk_theming_engine_render_arrow;
 212   klass->render_background = gtk_theming_engine_render_background;
 213   klass->render_frame = gtk_theming_engine_render_frame;
 214   klass->render_expander = gtk_theming_engine_render_expander;
 215   klass->render_focus = gtk_theming_engine_render_focus;
 216   klass->render_layout = gtk_theming_engine_render_layout;
 217   klass->render_line = gtk_theming_engine_render_line;
 218   klass->render_slider = gtk_theming_engine_render_slider;
 219   klass->render_frame_gap = gtk_theming_engine_render_frame_gap;
 220   klass->render_extension = gtk_theming_engine_render_extension;
 221   klass->render_handle = gtk_theming_engine_render_handle;
 222   klass->render_activity = gtk_theming_engine_render_activity;
 223
 224   /**
 225    * GtkThemingEngine:name:
 226    *
 227    * The theming engine name, this name will be used when registering
 228    * custom properties, for a theming engine named "Clearlooks" registering
 229    * a "glossy" custom property, it could be referenced in the CSS file as
 230    *
 231    * <programlisting>
 232    * -Clearlooks-glossy: true;
 233    * </programlisting>
 234    *
 235    * Since: 3.0
 236    */
 237   g_object_class_install_property (object_class,
 238                                    PROP_NAME,
 239                                    g_param_spec_string ("name",
 240                                                         P_("Name"),
 241                                                         P_("Theming engine name"),
 242                                                         NULL,
 243                                                         G_PARAM_CONSTRUCT_ONLY | GTK_PARAM_READWRITE));
 244
 245   g_type_class_add_private (object_class, sizeof (GtkThemingEnginePrivate));
 246 }
 247
 248 static void
 249 gtk_theming_engine_init (GtkThemingEngine *engine)
 250 {
 251   engine->priv = GTK_THEMING_ENGINE_GET_PRIVATE (engine);
 252 }
 253
 254 static void
 255 gtk_theming_engine_finalize (GObject *object)
 256 {
 257   GtkThemingEnginePrivate *priv;
 258
 259   priv = GTK_THEMING_ENGINE (object)->priv;
 260   g_free (priv->name);
 261
 262   G_OBJECT_GET_CLASS (gtk_theming_engine_parent_class)->finalize (object);
 263 }
 264
 265 static void
 266 gtk_theming_engine_impl_set_property (GObject      *object,
 267                                       guint         prop_id,
 268                                       const GValue *value,
 269                                       GParamSpec   *pspec)
 270 {
 271   GtkThemingEnginePrivate *priv;
 272
 273   priv = GTK_THEMING_ENGINE (object)->priv;
 274
 275   switch (prop_id)
 276     {
 277     case PROP_NAME:
 278       if (priv->name)
 279         g_free (priv->name);
 280
 281       priv->name = g_value_dup_string (value);
 282       break;
 283     default:
 284       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 285       break;
 286     }
 287 }
 288
 289 static void
 290 gtk_theming_engine_impl_get_property (GObject    *object,
 291                                       guint       prop_id,
 292                                       GValue     *value,
 293                                       GParamSpec *pspec)
 294 {
 295   GtkThemingEnginePrivate *priv;
 296
 297   priv = GTK_THEMING_ENGINE (object)->priv;
 298
 299   switch (prop_id)
 300     {
 301     case PROP_NAME:
 302       g_value_set_string (value, priv->name);
 303       break;
 304     default:
 305       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 306       break;
 307     }
 308 }
 309
 310 void
 311 _gtk_theming_engine_set_context (GtkThemingEngine *engine,
 312                                  GtkStyleContext  *context)
 313 {
 314   GtkThemingEnginePrivate *priv;
 315
 316   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 317   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
 318
 319   priv = engine->priv;
 320   priv->context = context;
 321 }
 322
 323 /**
 324  * gtk_theming_engine_register_property:
 325  * @engine: a #GtkThemingEngine
 326  * @property_name: property name to register
 327  * @type: #GType the property will hold
 328  * @default_value: default value for this property
 329  * @parse_func: parsing function to use, or %NULL
 330  *
 331  * Registers a property so it can be used in the CSS file format,
 332  * on the CSS file the property will look like
 333  * "-${engine-object-name}-${@property_name}". being
 334  * ${engine-object-name} either the GtkThemingEngine:name property
 335  * or G_OBJECT_TYPE_NAME(engine) if the property is unset.
 336  *
 337  * For any type a @parse_func may be provided, being this function
 338  * used for turning any property value (between ':' and ';') in
 339  * CSS to the #GValue needed. For basic types there is already
 340  * builtin parsing support, so %NULL may be provided for these
 341  * cases.
 342  *
 343  * <note>
 344  * This function needs to be called only once during theming
 345  * engine object initialization.
 346  * </note>
 347  *
 348  * <note>
 349  * In order to make use of the custom registered properties in
 350  * the CSS file, make sure the engine is loaded first either in
 351  * a previous rule or within the same one.
 352  * <programlisting>
 353  * &ast; {
 354  *     engine: someengine;
 355  *     SomeEngine-custom-property: 2;
 356  * }
 357  * </programlisting>
 358  * </note>
 359  *
 360  * Since: 3.0
 361  **/
 362 void
 363 gtk_theming_engine_register_property (GtkThemingEngine       *engine,
 364                                       const gchar            *property_name,
 365                                       GType                   type,
 366                                       const GValue           *default_value,
 367                                       GtkStylePropertyParser  parse_func)
 368 {
 369   GtkThemingEnginePrivate *priv;
 370   const gchar *engine_name;
 371   gchar *name;
 372
 373   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 374   g_return_if_fail (property_name != NULL);
 375   g_return_if_fail (type != G_TYPE_INVALID);
 376   g_return_if_fail (default_value != NULL && G_IS_VALUE (default_value));
 377
 378   priv = engine->priv;
 379
 380   if (priv->name)
 381     engine_name = priv->name;
 382   else
 383     engine_name = G_OBJECT_TYPE_NAME (engine);
 384
 385   name = g_strdup_printf ("-%s-%s", engine_name, property_name);
 386   gtk_style_properties_register_property (name, type, default_value, parse_func);
 387   g_free (name);
 388 }
 389
 390 /**
 391  * gtk_theming_engine_get_property:
 392  * @engine: a #GtkThemingEngine
 393  * @property: the property name
 394  * @state: state to retrieve the value for
 395  * @value: (out) (transfer full): return location for the property value,
 396  *         you must free this memory using g_value_unset() once you are
 397  *         done with it.
 398  *
 399  * Gets a property value as retrieved from the style settings that apply
 400  * to the currently rendered element.
 401  *
 402  * Since: 3.0
 403  **/
 404 void
 405 gtk_theming_engine_get_property (GtkThemingEngine *engine,
 406                                  const gchar      *property,
 407                                  GtkStateFlags     state,
 408                                  GValue           *value)
 409 {
 410   GtkThemingEnginePrivate *priv;
 411
 412   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 413   g_return_if_fail (property != NULL);
 414   g_return_if_fail (value != NULL);
 415
 416   priv = engine->priv;
 417   gtk_style_context_get_property (priv->context, property, state, value);
 418 }
 419
 420 /**
 421  * gtk_theming_engine_get_valist:
 422  * @engine: a #GtkThemingEngine
 423  * @state: state to retrieve values for
 424  * @args: va_list of property name/return location pairs, followed by %NULL
 425  *
 426  * Retrieves several style property values that apply to the currently
 427  * rendered element.
 428  *
 429  * Since: 3.0
 430  **/
 431 void
 432 gtk_theming_engine_get_valist (GtkThemingEngine *engine,
 433                                GtkStateFlags     state,
 434                                va_list           args)
 435 {
 436   GtkThemingEnginePrivate *priv;
 437
 438   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 439
 440   priv = engine->priv;
 441   gtk_style_context_get_valist (priv->context, state, args);
 442 }
 443
 444 /**
 445  * gtk_theming_engine_get:
 446  * @engine: a #GtkThemingEngine
 447  * @state: state to retrieve values for
 448  * @...: property name /return value pairs, followed by %NULL
 449  *
 450  * Retrieves several style property values that apply to the currently
 451  * rendered element.
 452  *
 453  * Since: 3.0
 454  **/
 455 void
 456 gtk_theming_engine_get (GtkThemingEngine *engine,
 457                         GtkStateFlags     state,
 458                         ...)
 459 {
 460   GtkThemingEnginePrivate *priv;
 461   va_list args;
 462
 463   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 464
 465   priv = engine->priv;
 466
 467   va_start (args, state);
 468   gtk_style_context_get_valist (priv->context, state, args);
 469   va_end (args);
 470 }
 471
 472 /**
 473  * gtk_theming_engine_get_style_property:
 474  * @engine: a #GtkThemingEngine
 475  * @property_name: the name of the widget style property
 476  * @value: (out) (transfer full): Return location for the property value, free with
 477  *         g_value_unset() after use.
 478  *
 479  * Gets the value for a widget style property.
 480  *
 481  * Since: 3.0
 482  **/
 483 void
 484 gtk_theming_engine_get_style_property (GtkThemingEngine *engine,
 485                                        const gchar      *property_name,
 486                                        GValue           *value)
 487 {
 488   GtkThemingEnginePrivate *priv;
 489
 490   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 491   g_return_if_fail (property_name != NULL);
 492
 493   priv = engine->priv;
 494   gtk_style_context_get_style_property (priv->context, property_name, value);
 495 }
 496
 497 /**
 498  * gtk_theming_engine_get_style_valist:
 499  * @engine: a #GtkThemingEngine
 500  * @args: va_list of property name/return location pairs, followed by %NULL
 501  *
 502  * Retrieves several widget style properties from @engine according to the
 503  * currently rendered content's style.
 504  *
 505  * Since: 3.0
 506  **/
 507 void
 508 gtk_theming_engine_get_style_valist (GtkThemingEngine *engine,
 509                                      va_list           args)
 510 {
 511   GtkThemingEnginePrivate *priv;
 512
 513   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 514
 515   priv = engine->priv;
 516   gtk_style_context_get_style_valist (priv->context, args);
 517 }
 518
 519 /**
 520  * gtk_theming_engine_get_style:
 521  * @engine: a #GtkThemingEngine
 522  * @...: property name /return value pairs, followed by %NULL
 523  *
 524  * Retrieves several widget style properties from @engine according
 525  * to the currently rendered content's style.
 526  *
 527  * Since: 3.0
 528  **/
 529 void
 530 gtk_theming_engine_get_style (GtkThemingEngine *engine,
 531                               ...)
 532 {
 533   GtkThemingEnginePrivate *priv;
 534   va_list args;
 535
 536   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 537
 538   priv = engine->priv;
 539
 540   va_start (args, engine);
 541   gtk_style_context_get_style_valist (priv->context, args);
 542   va_end (args);
 543 }
 544
 545 /**
 546  * gtk_theming_engine_get_state:
 547  * @engine: a #GtkThemingEngine
 548  *
 549  * returns the state used when rendering.
 550  *
 551  * Returns: the state flags
 552  *
 553  * Since: 3.0
 554  **/
 555 GtkStateFlags
 556 gtk_theming_engine_get_state (GtkThemingEngine *engine)
 557 {
 558   GtkThemingEnginePrivate *priv;
 559
 560   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 561
 562   priv = engine->priv;
 563   return gtk_style_context_get_state (priv->context);
 564 }
 565
 566 /**
 567  * gtk_theming_engine_state_is_running:
 568  * @engine: a #GtkThemingEngine
 569  * @state: a widget state
 570  * @progress: (out): return location for the transition progress
 571  *
 572  * Returns %TRUE if there is a transition animation running for the
 573  * current region (see gtk_style_context_push_animatable_region()).
 574  *
 575  * If @progress is not %NULL, the animation progress will be returned
 576  * there, 0.0 means the state is closest to being %FALSE, while 1.0 means
 577  * it's closest to being %TRUE. This means transition animations will
 578  * run from 0 to 1 when @state is being set to %TRUE and from 1 to 0 when
 579  * it's being set to %FALSE.
 580  *
 581  * Returns: %TRUE if there is a running transition animation for @state.
 582  *
 583  * Since: 3.0
 584  **/
 585 gboolean
 586 gtk_theming_engine_state_is_running (GtkThemingEngine *engine,
 587                                      GtkStateType      state,
 588                                      gdouble          *progress)
 589 {
 590   GtkThemingEnginePrivate *priv;
 591
 592   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 593
 594   priv = engine->priv;
 595   return gtk_style_context_state_is_running (priv->context, state, progress);
 596 }
 597
 598 /**
 599  * gtk_theming_engine_get_path:
 600  * @engine: a #GtkThemingEngine
 601  *
 602  * Returns the widget path used for style matching.
 603  *
 604  * Returns: (transfer none): A #GtkWidgetPath
 605  *
 606  * Since: 3.0
 607  **/
 608 G_CONST_RETURN GtkWidgetPath *
 609 gtk_theming_engine_get_path (GtkThemingEngine *engine)
 610 {
 611   GtkThemingEnginePrivate *priv;
 612
 613   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 614
 615   priv = engine->priv;
 616   return gtk_style_context_get_path (priv->context);
 617 }
 618
 619 /**
 620  * gtk_theming_engine_has_class:
 621  * @engine: a #GtkThemingEngine
 622  * @style_class: class name to look up
 623  *
 624  * Returns %TRUE if the currently rendered contents have
 625  * defined the given class name.
 626  *
 627  * Returns: %TRUE if @engine has @class_name defined
 628  *
 629  * Since: 3.0
 630  **/
 631 gboolean
 632 gtk_theming_engine_has_class (GtkThemingEngine *engine,
 633                               const gchar      *style_class)
 634 {
 635   GtkThemingEnginePrivate *priv;
 636
 637   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 638
 639   priv = engine->priv;
 640   return gtk_style_context_has_class (priv->context, style_class);
 641 }
 642
 643 /**
 644  * gtk_theming_engine_has_region:
 645  * @engine: a #GtkThemingEngine
 646  * @style_region: a region name
 647  * @flags: (out) (allow-none): return location for region flags
 648  *
 649  * Returns %TRUE if the currently rendered contents have the
 650  * region defined. If @flags_return is not %NULL, it is set
 651  * to the flags affecting the region.
 652  *
 653  * Returns: %TRUE if region is defined
 654  *
 655  * Since: 3.0
 656  **/
 657 gboolean
 658 gtk_theming_engine_has_region (GtkThemingEngine *engine,
 659                                const gchar      *style_region,
 660                                GtkRegionFlags   *flags)
 661 {
 662   GtkThemingEnginePrivate *priv;
 663
 664   if (flags)
 665     *flags = 0;
 666
 667   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 668
 669   priv = engine->priv;
 670   return gtk_style_context_has_region (priv->context, style_region, flags);
 671 }
 672
 673 /**
 674  * gtk_theming_engine_get_direction:
 675  * @engine: a #GtkThemingEngine
 676  *
 677  * Returns the widget direction used for rendering.
 678  *
 679  * Returns: the widget direction
 680  *
 681  * Since: 3.0
 682  **/
 683 GtkTextDirection
 684 gtk_theming_engine_get_direction (GtkThemingEngine *engine)
 685 {
 686   GtkThemingEnginePrivate *priv;
 687
 688   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), GTK_TEXT_DIR_LTR);
 689
 690   priv = engine->priv;
 691   return gtk_style_context_get_direction (priv->context);
 692 }
 693
 694 /**
 695  * gtk_theming_engine_get_junction_sides:
 696  * @engine: a #GtkThemingEngine
 697  *
 698  * Returns the widget direction used for rendering.
 699  *
 700  * Returns: the widget direction
 701  *
 702  * Since: 3.0
 703  **/
 704 GtkJunctionSides
 705 gtk_theming_engine_get_junction_sides (GtkThemingEngine *engine)
 706 {
 707   GtkThemingEnginePrivate *priv;
 708
 709   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 710
 711   priv = engine->priv;
 712   return gtk_style_context_get_junction_sides (priv->context);
 713 }
 714
 715 /* GtkThemingModule */
 716
 717 static gboolean
 718 gtk_theming_module_load (GTypeModule *type_module)
 719 {
 720   GtkThemingModule *theming_module;
 721   GModule *module;
 722   gchar *name, *module_path;
 723
 724   theming_module = GTK_THEMING_MODULE (type_module);
 725   name = theming_module->name;
 726   module_path = _gtk_find_module (name, "theming-engines");
 727
 728   if (!module_path)
 729     {
 730       g_warning (_("Unable to locate theme engine in module path: \"%s\","), name);
 731       return FALSE;
 732     }
 733
 734   module = g_module_open (module_path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 735   g_free (module_path);
 736
 737   if (!module)
 738     {
 739       g_warning ("%s", g_module_error ());
 740       return FALSE;
 741     }
 742
 743   if (!g_module_symbol (module, "theme_init",
 744                         (gpointer *) &theming_module->init) ||
 745       !g_module_symbol (module, "theme_exit",
 746                         (gpointer *) &theming_module->exit) ||
 747       !g_module_symbol (module, "create_engine",
 748                         (gpointer *) &theming_module->create_engine))
 749     {
 750       g_warning ("%s", g_module_error ());
 751       g_module_close (module);
 752
 753       return FALSE;
 754     }
 755
 756   theming_module->module = module;
 757
 758   theming_module->init (theming_module);
 759
 760   return TRUE;
 761 }
 762
 763 static void
 764 gtk_theming_module_unload (GTypeModule *type_module)
 765 {
 766   GtkThemingModule *theming_module;
 767
 768   theming_module = GTK_THEMING_MODULE (type_module);
 769
 770   theming_module->exit ();
 771
 772   g_module_close (theming_module->module);
 773
 774   theming_module->module = NULL;
 775   theming_module->init = NULL;
 776   theming_module->exit = NULL;
 777   theming_module->create_engine = NULL;
 778 }
 779
 780 static void
 781 gtk_theming_module_class_init (GtkThemingModuleClass *klass)
 782 {
 783   GTypeModuleClass *module_class = G_TYPE_MODULE_CLASS (klass);
 784
 785   module_class->load = gtk_theming_module_load;
 786   module_class->unload = gtk_theming_module_unload;
 787 }
 788
 789 static void
 790 gtk_theming_module_init (GtkThemingModule *module)
 791 {
 792 }
 793
 794 /**
 795  * gtk_theming_engine_load:
 796  * @name: Theme engine name to load
 797  *
 798  * Loads and initializes a theming engine module from the
 799  * standard directories.
 800  *
 801  * Returns: (transfer none): A theming engine, or %NULL if
 802  * the engine @name doesn't exist.
 803  **/
 804 GtkThemingEngine *
 805 gtk_theming_engine_load (const gchar *name)
 806 {
 807   static GHashTable *engines = NULL;
 808   static GtkThemingEngine *default_engine;
 809   GtkThemingEngine *engine = NULL;
 810
 811   if (name)
 812     {
 813       if (!engines)
 814         engines = g_hash_table_new (g_str_hash, g_str_equal);
 815
 816       engine = g_hash_table_lookup (engines, name);
 817
 818       if (!engine)
 819         {
 820           GtkThemingModule *module;
 821
 822           module = g_object_new (GTK_TYPE_THEMING_MODULE, NULL);
 823           g_type_module_set_name (G_TYPE_MODULE (module), name);
 824           module->name = g_strdup (name);
 825
 826           if (module && g_type_module_use (G_TYPE_MODULE (module)))
 827             {
 828               engine = (module->create_engine) ();
 829
 830               if (engine)
 831                 g_hash_table_insert (engines, module->name, engine);
 832             }
 833         }
 834     }
 835
 836   if (!engine)
 837     {
 838       if (G_UNLIKELY (!default_engine))
 839         default_engine = g_object_new (GTK_TYPE_THEMING_ENGINE, NULL);
 840
 841       engine = default_engine;
 842     }
 843
 844   return engine;
 845 }
 846
 847 /**
 848  * gtk_theming_engine_get_screen:
 849  * @engine: a #GtkThemingEngine
 850  *
 851  * Returns the #GdkScreen to which @engine currently rendering to.
 852  *
 853  * Returns: a #GdkScreen, or %NULL.
 854  **/
 855 GdkScreen *
 856 gtk_theming_engine_get_screen (GtkThemingEngine *engine)
 857 {
 858   GtkThemingEnginePrivate *priv;
 859
 860   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 861
 862   priv = engine->priv;
 863   return gtk_style_context_get_screen (priv->context);
 864 }
 865
 866 /* Paint method implementations */
 867 static void
 868 gtk_theming_engine_render_check (GtkThemingEngine *engine,
 869                                  cairo_t          *cr,
 870                                  gdouble           x,
 871                                  gdouble           y,
 872                                  gdouble           width,
 873                                  gdouble           height)
 874 {
 875   GdkRGBA *fg_color, *bg_color;
 876   const GtkWidgetPath *path;
 877   GtkStateFlags flags;
 878   gint exterior_size, interior_size, thickness, pad;
 879
 880   flags = gtk_theming_engine_get_state (engine);
 881   path = gtk_theming_engine_get_path (engine);
 882   cairo_save (cr);
 883
 884   gtk_theming_engine_get (engine, flags,
 885                           "color", &fg_color,
 886                           "background-color", &bg_color,
 887                           NULL);
 888
 889   exterior_size = MIN (width, height);
 890
 891   if (exterior_size % 2 == 0) /* Ensure odd */
 892     exterior_size -= 1;
 893
 894   /* FIXME: thickness */
 895   thickness = 1;
 896   pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
 897   interior_size = MAX (1, exterior_size - 2 * pad);
 898
 899   if (interior_size < 7)
 900     {
 901       interior_size = 7;
 902       pad = MAX (0, (exterior_size - interior_size) / 2);
 903     }
 904
 905   x -= (1 + exterior_size - (gint) width) / 2;
 906   y -= (1 + exterior_size - (gint) height) / 2;
 907
 908   if (!gtk_theming_engine_has_class (engine, "menu"))
 909     {
 910       cairo_set_line_width (cr, 1.0);
 911
 912       cairo_rectangle (cr, x + 0.5, y + 0.5, exterior_size - 1, exterior_size - 1);
 913       gdk_cairo_set_source_rgba (cr, bg_color);
 914       cairo_fill_preserve (cr);
 915
 916       gdk_cairo_set_source_rgba (cr, fg_color);
 917
 918       cairo_stroke (cr);
 919     }
 920
 921   gdk_cairo_set_source_rgba (cr, fg_color);
 922
 923   if (flags & GTK_STATE_FLAG_INCONSISTENT)
 924     {
 925       int line_thickness = MAX (1, (3 + interior_size * 2) / 7);
 926
 927       cairo_rectangle (cr,
 928                        x + pad,
 929                        y + pad + (1 + interior_size - line_thickness) / 2,
 930                        interior_size,
 931                        line_thickness);
 932       cairo_fill (cr);
 933     }
 934   else
 935     {
 936       gdouble progress;
 937       gboolean running;
 938
 939       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
 940
 941       if ((flags & GTK_STATE_FLAG_ACTIVE) || running)
 942         {
 943           if (!running)
 944             progress = 1;
 945
 946           cairo_translate (cr,
 947                            x + pad, y + pad);
 948
 949           cairo_scale (cr, interior_size / 7., interior_size / 7.);
 950
 951           cairo_rectangle (cr, 0, 0, 7 * progress, 7);
 952           cairo_clip (cr);
 953
 954           cairo_move_to  (cr, 7.0, 0.0);
 955           cairo_line_to  (cr, 7.5, 1.0);
 956           cairo_curve_to (cr, 5.3, 2.0,
 957                           4.3, 4.0,
 958                           3.5, 7.0);
 959           cairo_curve_to (cr, 3.0, 5.7,
 960                           1.3, 4.7,
 961                           0.0, 4.7);
 962           cairo_line_to  (cr, 0.2, 3.5);
 963           cairo_curve_to (cr, 1.1, 3.5,
 964                           2.3, 4.3,
 965                           3.0, 5.0);
 966           cairo_curve_to (cr, 1.0, 3.9,
 967                           2.4, 4.1,
 968                           3.2, 4.9);
 969           cairo_curve_to (cr, 3.5, 3.1,
 970                           5.2, 2.0,
 971                           7.0, 0.0);
 972
 973           cairo_fill (cr);
 974         }
 975     }
 976
 977   cairo_restore (cr);
 978
 979   gdk_rgba_free (fg_color);
 980 }
 981
 982 static void
 983 gtk_theming_engine_render_option (GtkThemingEngine *engine,
 984                                   cairo_t          *cr,
 985                                   gdouble           x,
 986                                   gdouble           y,
 987                                   gdouble           width,
 988                                   gdouble           height)
 989 {
 990   GtkStateFlags flags;
 991   GdkRGBA *fg_color, *bg_color;
 992   const GtkWidgetPath *path;
 993   gint exterior_size, interior_size, pad, thickness;
 994   gdouble radius;
 995
 996   flags = gtk_theming_engine_get_state (engine);
 997   path = gtk_theming_engine_get_path (engine);
 998   radius = MIN (width, height) / 2 - 0.5;
 999
1000   cairo_save (cr);
1001
1002   gtk_theming_engine_get (engine, flags,
1003                           "color", &fg_color,
1004                           "background-color", &bg_color,
1005                           NULL);
1006
1007   exterior_size = MIN (width, height);
1008
1009   if (exterior_size % 2 == 0) /* Ensure odd */
1010     exterior_size -= 1;
1011
1012   x -= (1 + exterior_size - width) / 2;
1013   y -= (1 + exterior_size - height) / 2;
1014
1015   if (!gtk_theming_engine_has_class (engine, "menu"))
1016     {
1017       gdk_cairo_set_source_rgba (cr, bg_color);
1018
1019       cairo_arc (cr,
1020                  x + exterior_size / 2.,
1021                  y + exterior_size / 2.,
1022                  (exterior_size - 1) / 2.,
1023                  0, 2 * G_PI);
1024
1025       cairo_fill_preserve (cr);
1026
1027       gdk_cairo_set_source_rgba (cr, fg_color);
1028
1029       cairo_set_line_width (cr, 1.);
1030       cairo_stroke (cr);
1031     }
1032
1033   gdk_cairo_set_source_rgba (cr, fg_color);
1034
1035   /* FIXME: thickness */
1036   thickness = 1;
1037
1038   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1039     {
1040       gint line_thickness;
1041
1042       pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1043       interior_size = MAX (1, exterior_size - 2 * pad);
1044
1045       if (interior_size < 7)
1046         {
1047           interior_size = 7;
1048           pad = MAX (0, (exterior_size - interior_size) / 2);
1049         }
1050
1051       line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1052
1053       cairo_rectangle (cr,
1054                        x + pad,
1055                        y + pad + (interior_size - line_thickness) / 2.,
1056                        interior_size,
1057                        line_thickness);
1058       cairo_fill (cr);
1059     }
1060   if (flags & GTK_STATE_FLAG_ACTIVE)
1061     {
1062       pad = thickness + MAX (1, 2 * (exterior_size - 2 * thickness) / 9);
1063       interior_size = MAX (1, exterior_size - 2 * pad);
1064
1065       if (interior_size < 5)
1066         {
1067           interior_size = 7;
1068           pad = MAX (0, (exterior_size - interior_size) / 2);
1069         }
1070
1071       cairo_arc (cr,
1072                  x + pad + interior_size / 2.,
1073                  y + pad + interior_size / 2.,
1074                  interior_size / 2.,
1075                  0, 2 * G_PI);
1076       cairo_fill (cr);
1077     }
1078
1079   cairo_restore (cr);
1080
1081   gdk_rgba_free (fg_color);
1082   gdk_rgba_free (bg_color);
1083 }
1084
1085 static void
1086 add_path_arrow (cairo_t *cr,
1087                 gdouble  angle,
1088                 gdouble  x,
1089                 gdouble  y,
1090                 gdouble  size)
1091 {
1092   cairo_save (cr);
1093
1094   cairo_translate (cr, x + (size / 2), y + (size / 2));
1095   cairo_rotate (cr, angle);
1096
1097   cairo_move_to (cr, 0, - (size / 4));
1098   cairo_line_to (cr, - (size / 2), (size / 4));
1099   cairo_line_to (cr, (size / 2), (size / 4));
1100   cairo_close_path (cr);
1101
1102   cairo_restore (cr);
1103 }
1104
1105 static void
1106 gtk_theming_engine_render_arrow (GtkThemingEngine *engine,
1107                                  cairo_t          *cr,
1108                                  gdouble           angle,
1109                                  gdouble           x,
1110                                  gdouble           y,
1111                                  gdouble           size)
1112 {
1113   GtkStateFlags flags;
1114   GdkRGBA *fg_color;
1115
1116   cairo_save (cr);
1117
1118   flags = gtk_theming_engine_get_state (engine);
1119
1120   gtk_theming_engine_get (engine, flags,
1121                           "color", &fg_color,
1122                           NULL);
1123
1124   if (flags & GTK_STATE_FLAG_INSENSITIVE)
1125     {
1126       add_path_arrow (cr, angle, x + 1, y + 1, size);
1127       cairo_set_source_rgb (cr, 1, 1, 1);
1128       cairo_fill (cr);
1129     }
1130
1131   add_path_arrow (cr, angle, x, y, size);
1132   gdk_cairo_set_source_rgba (cr, fg_color);
1133   cairo_fill (cr);
1134
1135   cairo_restore (cr);
1136
1137   gdk_rgba_free (fg_color);
1138 }
1139
1140 static void
1141 add_path_line (cairo_t        *cr,
1142                gdouble         x1,
1143                gdouble         y1,
1144                gdouble         x2,
1145                gdouble         y2)
1146 {
1147   /* Adjust endpoints */
1148   if (y1 == y2)
1149     {
1150       y1 += 0.5;
1151       y2 += 0.5;
1152       x2 += 1;
1153     }
1154   else if (x1 == x2)
1155     {
1156       x1 += 0.5;
1157       x2 += 0.5;
1158       y2 += 1;
1159     }
1160
1161   cairo_move_to (cr, x1, y1);
1162   cairo_line_to (cr, x2, y2);
1163 }
1164
1165 static void
1166 add_path_rectangle_sides (cairo_t  *cr,
1167                           gdouble   x,
1168                           gdouble   y,
1169                           gdouble   width,
1170                           gdouble   height,
1171                           guint     sides)
1172 {
1173   if (sides & SIDE_TOP)
1174     {
1175       cairo_move_to (cr, x, y + 0.5);
1176       cairo_line_to (cr, x + width, y + 0.5);
1177     }
1178
1179   if (sides & SIDE_RIGHT)
1180     {
1181       cairo_move_to (cr, x + width - 0.5, y);
1182       cairo_line_to (cr, x + width - 0.5, y + height);
1183     }
1184
1185   if (sides & SIDE_BOTTOM)
1186     {
1187       cairo_move_to (cr, x, y + height - 0.5);
1188       cairo_line_to (cr, x + width, y + height - 0.5);
1189     }
1190
1191   if (sides & SIDE_LEFT)
1192     {
1193       cairo_move_to (cr, x + 0.5, y + height);
1194       cairo_line_to (cr, x + 0.5, y);
1195     }
1196 }
1197
1198 static void
1199 add_path_gap_side (cairo_t           *cr,
1200                    GtkPositionType    gap_side,
1201                    gdouble            x,
1202                    gdouble            y,
1203                    gdouble            width,
1204                    gdouble            height,
1205                    gdouble            xy0_gap,
1206                    gdouble            xy1_gap)
1207 {
1208   switch (gap_side)
1209     {
1210     case GTK_POS_TOP:
1211       add_path_line (cr, x, y, x + xy0_gap, y);
1212       add_path_line (cr, x + xy1_gap, y, x + width, y);
1213       break;
1214     case GTK_POS_BOTTOM:
1215       add_path_line (cr, x, y + height, x + xy0_gap, y + height);
1216       add_path_line (cr, x + xy1_gap, y + height, x + width, y + height);
1217       break;
1218     case GTK_POS_LEFT:
1219       add_path_line (cr, x, y, x, y + xy0_gap);
1220       add_path_line (cr, x, y + xy1_gap, x, y + height);
1221       break;
1222     case GTK_POS_RIGHT:
1223       add_path_line (cr, x + width, y, x + width, y + xy0_gap);
1224       add_path_line (cr, x + width, y + xy1_gap, x + width, y + height);
1225       break;
1226     }
1227 }
1228
1229 static void
1230 color_shade (const GdkRGBA *color,
1231              gdouble        factor,
1232              GdkRGBA       *color_return)
1233 {
1234   color_return->red = CLAMP (color->red * factor, 0, 1);
1235   color_return->green = CLAMP (color->green * factor, 0, 1);
1236   color_return->blue = CLAMP (color->blue * factor, 0, 1);
1237   color_return->alpha = color->alpha;
1238 }
1239
1240 static void
1241 _cairo_round_rectangle_sides (cairo_t          *cr,
1242                               gdouble           radius,
1243                               gdouble           x,
1244                               gdouble           y,
1245                               gdouble           width,
1246                               gdouble           height,
1247                               guint             sides,
1248                               GtkJunctionSides  junction)
1249 {
1250   radius = CLAMP (radius, 0, MIN (width / 2, height / 2));
1251
1252   if (sides & SIDE_RIGHT)
1253     {
1254       if (radius == 0 ||
1255           (junction & GTK_JUNCTION_TOP) ||
1256           (junction & GTK_JUNCTION_RIGHT))
1257         cairo_move_to (cr, x + width, y);
1258       else
1259         {
1260           cairo_new_sub_path (cr);
1261           cairo_arc (cr, x + width - radius, y + radius, radius, - G_PI / 4, 0);
1262         }
1263
1264       if (radius == 0 ||
1265           (junction & GTK_JUNCTION_BOTTOM) ||
1266           (junction & GTK_JUNCTION_RIGHT))
1267         cairo_line_to (cr, x + width, y + height);
1268       else
1269         cairo_arc (cr, x + width - radius, y + height - radius, radius, 0, G_PI / 4);
1270     }
1271
1272   if (sides & SIDE_BOTTOM)
1273     {
1274       if (radius != 0 &&
1275           ! (junction & GTK_JUNCTION_RIGHT) &&
1276           ! (junction & GTK_JUNCTION_BOTTOM))
1277         {
1278           if ((sides & SIDE_RIGHT) == 0)
1279             cairo_new_sub_path (cr);
1280
1281           cairo_arc (cr, x + width - radius, y + height - radius, radius, G_PI / 4, G_PI / 2);
1282         }
1283
1284       if (radius == 0 ||
1285           (junction & GTK_JUNCTION_BOTTOM) ||
1286           (junction & GTK_JUNCTION_LEFT))
1287         cairo_line_to (cr, x, y + height);
1288       else
1289         cairo_arc (cr, x + radius, y + height - radius, radius, G_PI / 2, 3 * (G_PI / 4));
1290     }
1291   else
1292     cairo_move_to (cr, x, y + height);
1293
1294   if (sides & SIDE_LEFT)
1295     {
1296       if (radius != 0 &&
1297           ! (junction & GTK_JUNCTION_LEFT) &&
1298           ! (junction & GTK_JUNCTION_BOTTOM))
1299         {
1300           if ((sides & SIDE_BOTTOM) == 0)
1301             cairo_new_sub_path (cr);
1302
1303           cairo_arc (cr, x + radius, y + height - radius, radius, 3 * (G_PI / 4), G_PI);
1304         }
1305
1306       if (radius == 0 ||
1307           (junction & GTK_JUNCTION_TOP) ||
1308           (junction & GTK_JUNCTION_LEFT))
1309         cairo_line_to (cr, x, y);
1310       else
1311         cairo_arc (cr, x + radius, y + radius, radius, G_PI, G_PI + G_PI / 4);
1312     }
1313
1314   if (sides & SIDE_TOP)
1315     {
1316       if (radius != 0 &&
1317           ! (junction & GTK_JUNCTION_TOP) &&
1318           ! (junction & GTK_JUNCTION_LEFT))
1319         {
1320           if ((sides & SIDE_TOP) == 0)
1321             cairo_new_sub_path (cr);
1322
1323           cairo_arc (cr, x + radius, y + radius, radius, 5 * (G_PI / 4), 3 * (G_PI / 2));
1324         }
1325
1326       if (radius == 0 ||
1327           (junction & GTK_JUNCTION_TOP) ||
1328           (junction & GTK_JUNCTION_RIGHT))
1329         cairo_line_to (cr, x + width, y);
1330       else
1331         cairo_arc (cr, x + width - radius, y + radius, radius, 3 * (G_PI / 2), - G_PI / 4);
1332     }
1333 }
1334
1335 static void
1336 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1337                                       cairo_t          *cr,
1338                                       gdouble           x,
1339                                       gdouble           y,
1340                                       gdouble           width,
1341                                       gdouble           height)
1342 {
1343   GdkRGBA *bg_color;
1344   cairo_pattern_t *pattern;
1345   GtkStateFlags flags;
1346   gboolean running;
1347   gdouble progress, alpha = 1;
1348   GtkJunctionSides junction;
1349   gint radius;
1350
1351   flags = gtk_theming_engine_get_state (engine);
1352   junction = gtk_theming_engine_get_junction_sides (engine);
1353   cairo_save (cr);
1354
1355   if (gtk_theming_engine_has_class (engine, "spinbutton") &&
1356       gtk_theming_engine_has_class (engine, "button"))
1357     {
1358       x += 2;
1359       y += 2;
1360       width -= 4;
1361       height -= 4;
1362     }
1363
1364   gtk_theming_engine_get (engine, flags,
1365                           "background-image", &pattern,
1366                           "background-color", &bg_color,
1367                           "border-radius", &radius,
1368                           NULL);
1369
1370   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1371
1372   _cairo_round_rectangle_sides (cr, (gdouble) radius,
1373                                 x, y, width, height,
1374                                 SIDE_ALL, junction);
1375   cairo_clip (cr);
1376
1377   if (gtk_theming_engine_has_class (engine, "background"))
1378     {
1379       cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0); /* transparent */
1380       cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
1381       cairo_paint (cr);
1382     }
1383
1384   cairo_translate (cr, x, y);
1385   cairo_scale (cr, width, height);
1386
1387   if (running)
1388     {
1389       cairo_pattern_t *other_pattern;
1390       GtkStateFlags other_flags;
1391       GdkRGBA *other_bg;
1392       cairo_pattern_t *new_pattern = NULL;
1393
1394       if (flags & GTK_STATE_FLAG_PRELIGHT)
1395         {
1396           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
1397           progress = 1 - progress;
1398         }
1399       else
1400         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
1401
1402       gtk_theming_engine_get (engine, other_flags,
1403                               "background-image", &other_pattern,
1404                               "background-color", &other_bg,
1405                               NULL);
1406
1407       if (pattern && other_pattern)
1408         {
1409           cairo_pattern_type_t type, other_type;
1410           gint n0, n1;
1411
1412           cairo_pattern_get_color_stop_count (pattern, &n0);
1413           cairo_pattern_get_color_stop_count (other_pattern, &n1);
1414           type = cairo_pattern_get_type (pattern);
1415           other_type = cairo_pattern_get_type (other_pattern);
1416
1417           if (type == other_type && n0 == n1)
1418             {
1419               gdouble offset0, red0, green0, blue0, alpha0;
1420               gdouble offset1, red1, green1, blue1, alpha1;
1421               gdouble x00, x01, y00, y01, x10, x11, y10, y11;
1422               gdouble r00, r01, r10, r11;
1423               guint i;
1424
1425               if (type == CAIRO_PATTERN_TYPE_LINEAR)
1426                 {
1427                   cairo_pattern_get_linear_points (pattern, &x00, &y00, &x01, &y01);
1428                   cairo_pattern_get_linear_points (other_pattern, &x10, &y10, &x11, &y11);
1429
1430                   new_pattern = cairo_pattern_create_linear (x00 + (x10 - x00) * progress,
1431                                                              y00 + (y10 - y00) * progress,
1432                                                              x01 + (x11 - x01) * progress,
1433                                                              y01 + (y11 - y01) * progress);
1434                 }
1435               else
1436                 {
1437                   cairo_pattern_get_radial_circles (pattern, &x00, &y00, &r00, &x01, &y01, &r01);
1438                   cairo_pattern_get_radial_circles (other_pattern, &x10, &y10, &r10, &x11, &y11, &r11);
1439
1440                   new_pattern = cairo_pattern_create_radial (x00 + (x10 - x00) * progress,
1441                                                              y00 + (y10 - y00) * progress,
1442                                                              r00 + (r10 - r00) * progress,
1443                                                              x01 + (x11 - x01) * progress,
1444                                                              y01 + (y11 - y01) * progress,
1445                                                              r01 + (r11 - r01) * progress);
1446                 }
1447
1448               cairo_pattern_set_filter (new_pattern, CAIRO_FILTER_FAST);
1449               i = 0;
1450
1451               /* Blend both gradients into one */
1452               while (i < n0 && i < n1)
1453                 {
1454                   cairo_pattern_get_color_stop_rgba (pattern, i,
1455                                                      &offset0,
1456                                                      &red0, &green0, &blue0,
1457                                                      &alpha0);
1458                   cairo_pattern_get_color_stop_rgba (other_pattern, i,
1459                                                      &offset1,
1460                                                      &red1, &green1, &blue1,
1461                                                      &alpha1);
1462
1463                   cairo_pattern_add_color_stop_rgba (new_pattern,
1464                                                      offset0 + ((offset1 - offset0) * progress),
1465                                                      red0 + ((red1 - red0) * progress),
1466                                                      green0 + ((green1 - green0) * progress),
1467                                                      blue0 + ((blue1 - blue0) * progress),
1468                                                      alpha0 + ((alpha1 - alpha0) * progress));
1469                   i++;
1470                 }
1471             }
1472           else
1473             {
1474               /* Different pattern types, or different color
1475                * stop counts, alpha blend both patterns.
1476                */
1477               cairo_rectangle (cr, 0, 0, 1, 1);
1478               cairo_set_source (cr, other_pattern);
1479               cairo_fill_preserve (cr);
1480
1481               /* Set alpha for posterior drawing
1482                * of the target pattern
1483                */
1484               alpha = 1 - progress;
1485             }
1486         }
1487       else if (pattern || other_pattern)
1488         {
1489           cairo_pattern_t *p;
1490           const GdkRGBA *c;
1491           gdouble x0, y0, x1, y1, r0, r1;
1492           gint n, i;
1493
1494           /* Blend a pattern with a color */
1495           if (pattern)
1496             {
1497               p = pattern;
1498               c = other_bg;
1499               progress = 1 - progress;
1500             }
1501           else
1502             {
1503               p = other_pattern;
1504               c = bg_color;
1505             }
1506
1507           if (cairo_pattern_get_type (p) == CAIRO_PATTERN_TYPE_LINEAR)
1508             {
1509               cairo_pattern_get_linear_points (p, &x0, &y0, &x1, &y1);
1510               new_pattern = cairo_pattern_create_linear (x0, y0, x1, y1);
1511             }
1512           else
1513             {
1514               cairo_pattern_get_radial_circles (p, &x0, &y0, &r0, &x1, &y1, &r1);
1515               new_pattern = cairo_pattern_create_radial (x0, y0, r0, x1, y1, r1);
1516             }
1517
1518           cairo_pattern_get_color_stop_count (p, &n);
1519
1520           for (i = 0; i < n; i++)
1521             {
1522               gdouble red1, green1, blue1, alpha1;
1523               gdouble offset;
1524
1525               cairo_pattern_get_color_stop_rgba (p, i,
1526                                                  &offset,
1527                                                  &red1, &green1, &blue1,
1528                                                  &alpha1);
1529               cairo_pattern_add_color_stop_rgba (new_pattern, offset,
1530                                                  c->red + ((red1 - c->red) * progress),
1531                                                  c->green + ((green1 - c->green) * progress),
1532                                                  c->blue + ((blue1 - c->blue) * progress),
1533                                                  c->alpha + ((alpha1 - c->alpha) * progress));
1534             }
1535         }
1536       else
1537         {
1538           const GdkRGBA *color, *other_color;
1539
1540           /* Merge just colors */
1541           color = bg_color;
1542           other_color = other_bg;
1543
1544           new_pattern = cairo_pattern_create_rgba (CLAMP (color->red + ((other_color->red - color->red) * progress), 0, 1),
1545                                                    CLAMP (color->green + ((other_color->green - color->green) * progress), 0, 1),
1546                                                    CLAMP (color->blue + ((other_color->blue - color->blue) * progress), 0, 1),
1547                                                    CLAMP (color->alpha + ((other_color->alpha - color->alpha) * progress), 0, 1));
1548         }
1549
1550       if (new_pattern)
1551         {
1552           /* Replace pattern to use */
1553           cairo_pattern_destroy (pattern);
1554           pattern = new_pattern;
1555         }
1556
1557       if (other_pattern)
1558         cairo_pattern_destroy (other_pattern);
1559
1560       if (other_bg)
1561         gdk_rgba_free (other_bg);
1562     }
1563
1564   cairo_rectangle (cr, 0, 0, 1, 1);
1565
1566   if (pattern)
1567     {
1568       cairo_set_source (cr, pattern);
1569       cairo_pattern_destroy (pattern);
1570     }
1571   else
1572     gdk_cairo_set_source_rgba (cr, bg_color);
1573
1574   if (gtk_theming_engine_has_class (engine, "tooltip"))
1575     {
1576       cairo_fill_preserve (cr);
1577
1578       cairo_set_source_rgb (cr, 0, 0, 0);
1579       cairo_stroke (cr);
1580     }
1581   else
1582     {
1583       if (alpha == 1)
1584         cairo_fill (cr);
1585       else
1586         {
1587           cairo_pattern_t *mask;
1588
1589           mask = cairo_pattern_create_rgba (1, 1, 1, alpha);
1590           cairo_mask (cr, mask);
1591           cairo_pattern_destroy (mask);
1592         }
1593     }
1594
1595   cairo_restore (cr);
1596
1597   gdk_rgba_free (bg_color);
1598 }
1599
1600 static void
1601 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1602                                  cairo_t          *cr,
1603                                  gdouble           x,
1604                                  gdouble           y,
1605                                  gdouble           width,
1606                                  gdouble           height)
1607 {
1608   GtkStateFlags flags;
1609   GdkRGBA lighter;
1610   GdkRGBA *border_color;
1611   Gtk9Slice *slice;
1612   GtkBorderStyle border_style;
1613   gint border_width, radius;
1614   GtkJunctionSides junction;
1615   gdouble d1, d2, m;
1616
1617   flags = gtk_theming_engine_get_state (engine);
1618   junction = gtk_theming_engine_get_junction_sides (engine);
1619
1620   gtk_theming_engine_get (engine, flags,
1621                           "border-image", &slice,
1622                           "border-color", &border_color,
1623                           "border-style", &border_style,
1624                           "border-width", &border_width,
1625                           "border-radius", &radius,
1626                           NULL);
1627
1628   if (slice)
1629     {
1630       gtk_9slice_render (slice, cr, x, y, width, height);
1631       gtk_9slice_unref (slice);
1632     }
1633   else if (border_color &&
1634            border_style != GTK_BORDER_STYLE_NONE)
1635     {
1636       cairo_save (cr);
1637
1638       color_shade (border_color, 1.8, &lighter);
1639
1640       switch (border_style)
1641         {
1642         case GTK_BORDER_STYLE_NONE:
1643           break;
1644         case GTK_BORDER_STYLE_SOLID:
1645           cairo_set_line_width (cr, border_width);
1646
1647           if (border_width > 1)
1648             {
1649               x += (gdouble) border_width / 2;
1650               y += (gdouble) border_width / 2;
1651               width -= border_width;
1652               height -= border_width;
1653             }
1654
1655           _cairo_round_rectangle_sides (cr, (gdouble) radius, x, y, width, height,
1656                                         SIDE_ALL, junction);
1657           gdk_cairo_set_source_rgba (cr, border_color);
1658           cairo_stroke (cr);
1659
1660           break;
1661         case GTK_BORDER_STYLE_INSET:
1662         case GTK_BORDER_STYLE_OUTSET:
1663           cairo_set_line_width (cr, border_width);
1664           cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1665
1666           d1 = d2 = 0;
1667
1668           if (border_width > 1)
1669             {
1670               d1 = (gdouble) border_width / 2;
1671               d2 = (gdouble) (border_width - (gint) d1) + 1;
1672             }
1673
1674           cairo_save (cr);
1675
1676           m = MIN (width, height);
1677           m /= 2;
1678
1679           /* Only needed for square frames to have a 3D-like
1680            * feeling, for rounded ones, the arc will ensure
1681            * the stroke is painted to end at 45°.
1682            */
1683           if (radius == 0)
1684             {
1685               cairo_move_to (cr, x, y + height);
1686               cairo_line_to (cr, x + m, y + height - m);
1687               cairo_line_to (cr, x + width - m, y + m);
1688               cairo_line_to (cr, x + width, y);
1689               cairo_line_to (cr, x + width, y + height);
1690               cairo_close_path (cr);
1691
1692               cairo_clip (cr);
1693             }
1694
1695           if (border_style == GTK_BORDER_STYLE_INSET)
1696             gdk_cairo_set_source_rgba (cr, &lighter);
1697           else
1698             gdk_cairo_set_source_rgba (cr, border_color);
1699
1700           _cairo_round_rectangle_sides (cr, (gdouble) radius,
1701                                         x + d1, y + d1,
1702                                         width - d2, height - d2,
1703                                         SIDE_BOTTOM | SIDE_RIGHT, junction);
1704           cairo_stroke (cr);
1705
1706           cairo_restore (cr);
1707
1708           cairo_save (cr);
1709
1710           if (radius == 0)
1711             {
1712               cairo_move_to (cr, x, y + height);
1713               cairo_line_to (cr, x + m, y + height - m);
1714               cairo_line_to (cr, x + width - m, y + m);
1715               cairo_line_to (cr, x + width, y);
1716               cairo_line_to (cr, x, y);
1717               cairo_close_path (cr);
1718
1719               cairo_clip (cr);
1720             }
1721
1722           if (border_style == GTK_BORDER_STYLE_INSET)
1723             gdk_cairo_set_source_rgba (cr, border_color);
1724           else
1725             gdk_cairo_set_source_rgba (cr, &lighter);
1726
1727           _cairo_round_rectangle_sides (cr, (gdouble) radius,
1728                                         x + d1, y + d1,
1729                                         width - d2, height - d2,
1730                                         SIDE_TOP | SIDE_LEFT, junction);
1731           cairo_stroke (cr);
1732
1733           cairo_restore (cr);
1734
1735           break;
1736         }
1737
1738       cairo_restore (cr);
1739     }
1740
1741   if (border_color)
1742     gdk_rgba_free (border_color);
1743 }
1744
1745 static void
1746 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1747                                     cairo_t          *cr,
1748                                     gdouble           x,
1749                                     gdouble           y,
1750                                     gdouble           width,
1751                                     gdouble           height)
1752 {
1753   GtkStateFlags flags;
1754   GdkRGBA *bg_color, *fg_color;
1755   double vertical_overshoot;
1756   int diameter;
1757   double radius;
1758   double interp;                /* interpolation factor for center position */
1759   double x_double_horz, y_double_horz;
1760   double x_double_vert, y_double_vert;
1761   double x_double, y_double;
1762   gdouble angle;
1763   gint line_width;
1764
1765   cairo_save (cr);
1766   flags = gtk_theming_engine_get_state (engine);
1767
1768   gtk_theming_engine_get (engine, flags,
1769                           "color", &fg_color,
1770                           "background-color", &bg_color,
1771                           NULL);
1772
1773   line_width = 1;
1774
1775   /* FIXME: LTR/RTL */
1776   if (flags & GTK_STATE_FLAG_ACTIVE)
1777     {
1778       angle = G_PI / 2;
1779       interp = 1.0;
1780     }
1781   else
1782     {
1783       angle = 0;
1784       interp = 0;
1785     }
1786
1787   /* Compute distance that the stroke extends beyonds the end
1788    * of the triangle we draw.
1789    */
1790   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
1791
1792   /* For odd line widths, we end the vertical line of the triangle
1793    * at a half pixel, so we round differently.
1794    */
1795   if (line_width % 2 == 1)
1796     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
1797   else
1798     vertical_overshoot = ceil (vertical_overshoot);
1799
1800   /* Adjust the size of the triangle we draw so that the entire stroke fits
1801    */
1802   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
1803
1804   /* If the line width is odd, we want the diameter to be even,
1805    * and vice versa, so force the sum to be odd. This relationship
1806    * makes the point of the triangle look right.
1807    */
1808   diameter -= (1 - (diameter + line_width) % 2);
1809
1810   radius = diameter / 2.;
1811
1812   /* Adjust the center so that the stroke is properly aligned with
1813    * the pixel grid. The center adjustment is different for the
1814    * horizontal and vertical orientations. For intermediate positions
1815    * we interpolate between the two.
1816    */
1817   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1818   y_double_vert = (y + height / 2) - 0.5;
1819
1820   x_double_horz = (x + width / 2) - 0.5;
1821   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1822
1823   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
1824   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
1825
1826   cairo_translate (cr, x_double, y_double);
1827   cairo_rotate (cr, angle);
1828
1829   cairo_move_to (cr, - radius / 2., - radius);
1830   cairo_line_to (cr,   radius / 2.,   0);
1831   cairo_line_to (cr, - radius / 2.,   radius);
1832   cairo_close_path (cr);
1833
1834   cairo_set_line_width (cr, line_width);
1835
1836   gdk_cairo_set_source_rgba (cr, fg_color);
1837
1838   cairo_fill_preserve (cr);
1839
1840   gdk_cairo_set_source_rgba (cr, fg_color);
1841   cairo_stroke (cr);
1842
1843   cairo_restore (cr);
1844
1845   gdk_rgba_free (fg_color);
1846   gdk_rgba_free (bg_color);
1847 }
1848
1849 static void
1850 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
1851                                  cairo_t          *cr,
1852                                  gdouble           x,
1853                                  gdouble           y,
1854                                  gdouble           width,
1855                                  gdouble           height)
1856 {
1857   GtkStateFlags flags;
1858   GdkRGBA *color;
1859   gint line_width;
1860   gint8 *dash_list;
1861
1862   cairo_save (cr);
1863   flags = gtk_theming_engine_get_state (engine);
1864
1865   gtk_theming_engine_get (engine, flags,
1866                           "color", &color,
1867                           NULL);
1868
1869   gtk_theming_engine_get_style (engine,
1870                                 "focus-line-width", &line_width,
1871                                 "focus-line-pattern", (gchar *) &dash_list,
1872                                 NULL);
1873
1874   cairo_set_line_width (cr, (gdouble) line_width);
1875
1876   if (dash_list[0])
1877     {
1878       gint n_dashes = strlen ((const gchar *) dash_list);
1879       gdouble *dashes = g_new (gdouble, n_dashes);
1880       gdouble total_length = 0;
1881       gdouble dash_offset;
1882       gint i;
1883
1884       for (i = 0; i < n_dashes; i++)
1885         {
1886           dashes[i] = dash_list[i];
1887           total_length += dash_list[i];
1888         }
1889
1890       /* The dash offset here aligns the pattern to integer pixels
1891        * by starting the dash at the right side of the left border
1892        * Negative dash offsets in cairo don't work
1893        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
1894        */
1895       dash_offset = - line_width / 2.;
1896
1897       while (dash_offset < 0)
1898         dash_offset += total_length;
1899
1900       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
1901       g_free (dashes);
1902     }
1903
1904   cairo_rectangle (cr,
1905                    x + line_width / 2.,
1906                    y + line_width / 2.,
1907                    width - line_width,
1908                    height - line_width);
1909
1910   gdk_cairo_set_source_rgba (cr, color);
1911   cairo_stroke (cr);
1912
1913   cairo_restore (cr);
1914
1915   gdk_rgba_free (color);
1916   g_free (dash_list);
1917 }
1918
1919 static void
1920 gtk_theming_engine_render_line (GtkThemingEngine *engine,
1921                                 cairo_t          *cr,
1922                                 gdouble           x0,
1923                                 gdouble           y0,
1924                                 gdouble           x1,
1925                                 gdouble           y1)
1926 {
1927   GdkRGBA *bg_color, darker, lighter;
1928   GtkStateFlags flags;
1929   gint i, thickness, thickness_dark, thickness_light, len;
1930   cairo_matrix_t matrix;
1931   gdouble angle;
1932
1933   /* FIXME: thickness */
1934   thickness = 2;
1935   thickness_dark = thickness / 2;
1936   thickness_light = thickness - thickness_dark;
1937
1938   flags = gtk_theming_engine_get_state (engine);
1939   cairo_save (cr);
1940
1941   gtk_theming_engine_get (engine, flags,
1942                           "background-color", &bg_color,
1943                           NULL);
1944   color_shade (bg_color, 0.7, &darker);
1945   color_shade (bg_color, 1.3, &lighter);
1946
1947   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1948   cairo_set_line_width (cr, 1);
1949
1950   angle = atan2 (x1 - x0, y1 - y0);
1951   angle = (2 * G_PI) - angle;
1952   angle += G_PI / 2;
1953
1954   cairo_get_matrix (cr, &matrix);
1955   cairo_matrix_translate (&matrix, x0, y0);
1956   cairo_matrix_rotate (&matrix, angle);
1957   cairo_set_matrix (cr, &matrix);
1958
1959   x1 -= x0;
1960   y1 -= y0;
1961
1962   len = (gint) sqrt ((x1 * x1) + (y1 * y1));
1963
1964   y0 = -thickness_dark;
1965
1966   for (i = 0; i < thickness_dark; i++)
1967     {
1968       gdk_cairo_set_source_rgba (cr, &lighter);
1969       add_path_line (cr, len - i - 1.5, y0, len - 0.5, y0);
1970       cairo_stroke (cr);
1971
1972       gdk_cairo_set_source_rgba (cr, &darker);
1973       add_path_line (cr, 0.5, y0, len - i - 1.5, y0);
1974       cairo_stroke (cr);
1975
1976       y0++;
1977     }
1978
1979   for (i = 0; i < thickness_light; i++)
1980     {
1981       gdk_cairo_set_source_rgba (cr, &darker);
1982       add_path_line (cr, 0.5, y0, thickness_light - i + 0.5, y0);
1983       cairo_stroke (cr);
1984
1985       gdk_cairo_set_source_rgba (cr, &lighter);
1986       add_path_line (cr, thickness_light - i + 0.5, y0, len - 0.5, y0);
1987       cairo_stroke (cr);
1988
1989       y0++;
1990     }
1991
1992   cairo_restore (cr);
1993
1994   gdk_rgba_free (bg_color);
1995 }
1996
1997 static void
1998 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
1999                                   cairo_t          *cr,
2000                                   gdouble           x,
2001                                   gdouble           y,
2002                                   PangoLayout      *layout)
2003 {
2004   const PangoMatrix *matrix;
2005   GdkRGBA *fg_color;
2006   GtkStateFlags flags;
2007   GdkScreen *screen;
2008
2009   cairo_save (cr);
2010   flags = gtk_theming_engine_get_state (engine);
2011
2012   gtk_theming_engine_get (engine, flags,
2013                           "color", &fg_color,
2014                           NULL);
2015
2016   screen = gtk_theming_engine_get_screen (engine);
2017   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2018
2019   if (matrix)
2020     {
2021       cairo_matrix_t cairo_matrix;
2022       PangoMatrix tmp_matrix;
2023       PangoRectangle rect;
2024
2025       cairo_matrix_init (&cairo_matrix,
2026                          matrix->xx, matrix->yx,
2027                          matrix->xy, matrix->yy,
2028                          matrix->x0, matrix->y0);
2029
2030       pango_layout_get_extents (layout, NULL, &rect);
2031       pango_matrix_transform_rectangle (matrix, &rect);
2032       pango_extents_to_pixels (&rect, NULL);
2033
2034       tmp_matrix = *matrix;
2035       cairo_matrix.x0 += x - rect.x;
2036       cairo_matrix.y0 += y - rect.y;
2037
2038       cairo_set_matrix (cr, &cairo_matrix);
2039     }
2040   else
2041     cairo_translate (cr, x, y);
2042
2043   if (flags & GTK_STATE_FLAG_INSENSITIVE)
2044     {
2045       cairo_save (cr);
2046       cairo_set_source_rgb (cr, 1, 1, 1);
2047       cairo_move_to (cr, 1, 1);
2048       _gtk_pango_fill_layout (cr, layout);
2049       cairo_restore (cr);
2050     }
2051
2052   gdk_cairo_set_source_rgba (cr, fg_color);
2053   pango_cairo_show_layout (cr, layout);
2054
2055   cairo_restore (cr);
2056
2057   gdk_rgba_free (fg_color);
2058 }
2059
2060 static void
2061 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2062                                   cairo_t          *cr,
2063                                   gdouble           x,
2064                                   gdouble           y,
2065                                   gdouble           width,
2066                                   gdouble           height,
2067                                   GtkOrientation    orientation)
2068 {
2069   const GtkWidgetPath *path;
2070   gint thickness;
2071
2072   path = gtk_theming_engine_get_path (engine);
2073
2074   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2075   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2076
2077   /* FIXME: thickness */
2078   thickness = 2;
2079
2080   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
2081     {
2082       if (orientation == GTK_ORIENTATION_VERTICAL)
2083         gtk_theming_engine_render_line (engine, cr,
2084                                         x + thickness,
2085                                         y + (gint) height / 2,
2086                                         x + width - thickness - 1,
2087                                         y + (gint) height / 2);
2088       else
2089         gtk_theming_engine_render_line (engine, cr,
2090                                         x + (gint) width / 2,
2091                                         y + thickness,
2092                                         x + (gint) width / 2,
2093                                         y + height - thickness - 1);
2094     }
2095 }
2096
2097 static void
2098 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2099                                      cairo_t          *cr,
2100                                      gdouble           x,
2101                                      gdouble           y,
2102                                      gdouble           width,
2103                                      gdouble           height,
2104                                      GtkPositionType   gap_side,
2105                                      gdouble           xy0_gap,
2106                                      gdouble           xy1_gap)
2107 {
2108   GtkStateFlags flags;
2109   GdkRGBA *bg_color;
2110   GdkRGBA lighter, darker;
2111   guint sides;
2112
2113   cairo_save (cr);
2114   flags = gtk_theming_engine_get_state (engine);
2115
2116   cairo_set_line_width (cr, 1);
2117
2118   gtk_theming_engine_get (engine, flags,
2119                           "background-color", &bg_color,
2120                           NULL);
2121   color_shade (bg_color, 0.7, &darker);
2122   color_shade (bg_color, 1.3, &lighter);
2123
2124   if (gtk_theming_engine_has_class (engine, "frame"))
2125     {
2126       if (gap_side == GTK_POS_RIGHT)
2127         sides = SIDE_BOTTOM;
2128       else if (gap_side == GTK_POS_BOTTOM)
2129         sides = SIDE_RIGHT;
2130       else
2131         sides = SIDE_BOTTOM | SIDE_RIGHT;
2132
2133       gdk_cairo_set_source_rgba (cr, &lighter);
2134       add_path_rectangle_sides (cr, x , y, width , height, sides);
2135       cairo_stroke (cr);
2136
2137       gdk_cairo_set_source_rgba (cr, &darker);
2138       add_path_rectangle_sides (cr, x, y, width - 1, height - 1, sides);
2139       cairo_stroke (cr);
2140
2141       if (gap_side == GTK_POS_RIGHT ||
2142           gap_side == GTK_POS_BOTTOM)
2143         {
2144           gdk_cairo_set_source_rgba (cr, &darker);
2145           add_path_gap_side (cr, gap_side,
2146                              x + 1, y + 1, width - 4, height - 4,
2147                              xy0_gap, xy1_gap);
2148           cairo_stroke (cr);
2149
2150           gdk_cairo_set_source_rgba (cr, &lighter);
2151           add_path_gap_side (cr, gap_side,
2152                              x, y, width, height,
2153                              xy0_gap, xy1_gap);
2154           cairo_stroke (cr);
2155         }
2156
2157       if (gap_side == GTK_POS_LEFT)
2158         sides = SIDE_TOP;
2159       else if (gap_side == GTK_POS_TOP)
2160         sides = SIDE_LEFT;
2161       else
2162         sides = SIDE_TOP | SIDE_LEFT;
2163
2164       gdk_cairo_set_source_rgba (cr, &lighter);
2165       add_path_rectangle_sides (cr, x + 1, y + 1, width - 2, height - 3, sides);
2166       cairo_stroke (cr);
2167
2168       gdk_cairo_set_source_rgba (cr, &darker);
2169       add_path_rectangle_sides (cr, x, y, width - 1, height - 1, sides);
2170       cairo_stroke (cr);
2171
2172       if (gap_side == GTK_POS_LEFT ||
2173           gap_side == GTK_POS_TOP)
2174         {
2175           gdk_cairo_set_source_rgba (cr, &lighter);
2176           add_path_gap_side (cr, gap_side,
2177                              x + 1, y + 1, width - 4, height - 4,
2178                              xy0_gap, xy1_gap);
2179           cairo_stroke (cr);
2180
2181           gdk_cairo_set_source_rgba (cr, &darker);
2182           add_path_gap_side (cr, gap_side,
2183                              x, y, width - 2, height - 2,
2184                              xy0_gap, xy1_gap);
2185           cairo_stroke (cr);
2186         }
2187     }
2188   else
2189     {
2190       if (gap_side == GTK_POS_RIGHT)
2191         sides = SIDE_BOTTOM;
2192       else if (gap_side == GTK_POS_BOTTOM)
2193         sides = SIDE_RIGHT;
2194       else
2195         sides = SIDE_BOTTOM | SIDE_RIGHT;
2196
2197       gdk_cairo_set_source_rgba (cr, &darker);
2198       add_path_rectangle_sides (cr, x + 1, y, width - 2, height, sides);
2199       add_path_rectangle_sides (cr, x, y + 1, width, height - 2, sides);
2200       cairo_stroke (cr);
2201
2202       cairo_set_source_rgb (cr, 0, 0, 0);
2203       add_path_rectangle_sides (cr, x, y, width, height, sides);
2204       cairo_stroke (cr);
2205
2206       if (gap_side == GTK_POS_RIGHT ||
2207           gap_side == GTK_POS_BOTTOM)
2208         {
2209           gdk_cairo_set_source_rgba (cr, &darker);
2210           add_path_gap_side (cr, gap_side,
2211                              x, y, width - 2, height - 2,
2212                              xy0_gap, xy1_gap);
2213           cairo_stroke (cr);
2214
2215           cairo_set_source_rgb (cr, 0, 0, 0);
2216           add_path_gap_side (cr, gap_side,
2217                              x, y, width - 1, height - 1,
2218                              xy0_gap, xy1_gap);
2219           cairo_stroke (cr);
2220         }
2221
2222       if (gap_side == GTK_POS_LEFT)
2223         sides = SIDE_TOP;
2224       else if (gap_side == GTK_POS_TOP)
2225         sides = SIDE_LEFT;
2226       else
2227         sides = SIDE_TOP | SIDE_LEFT;
2228
2229       gdk_cairo_set_source_rgba (cr, &lighter);
2230       add_path_rectangle_sides (cr, x, y, width, height, sides);
2231       cairo_stroke (cr);
2232
2233       if (gap_side == GTK_POS_LEFT ||
2234           gap_side == GTK_POS_TOP)
2235         {
2236           add_path_gap_side (cr, gap_side,
2237                              x, y, width, height,
2238                              xy0_gap, xy1_gap);
2239           cairo_stroke (cr);
2240         }
2241     }
2242
2243   cairo_restore (cr);
2244
2245   gdk_rgba_free (bg_color);
2246 }
2247
2248 static void
2249 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2250                                      cairo_t          *cr,
2251                                      gdouble           x,
2252                                      gdouble           y,
2253                                      gdouble           width,
2254                                      gdouble           height,
2255                                      GtkPositionType   gap_side)
2256 {
2257   GtkStateFlags flags;
2258   GdkRGBA *bg_color;
2259   GdkRGBA lighter, darker;
2260
2261   cairo_save (cr);
2262   flags = gtk_theming_engine_get_state (engine);
2263
2264   cairo_set_line_width (cr, 1);
2265
2266   gtk_theming_engine_get (engine, flags,
2267                           "background-color", &bg_color,
2268                           NULL);
2269   color_shade (bg_color, 0.7, &darker);
2270   color_shade (bg_color, 1.3, &lighter);
2271
2272   switch (gap_side)
2273     {
2274     case GTK_POS_TOP:
2275       gdk_cairo_set_source_rgba (cr, bg_color);
2276       cairo_rectangle (cr, x + 1, y, width - 2, height);
2277       cairo_fill (cr);
2278
2279       gdk_cairo_set_source_rgba (cr, &lighter);
2280       add_path_line (cr, x, y, x, y + height - 2);
2281       cairo_stroke (cr);
2282
2283       gdk_cairo_set_source_rgba (cr, bg_color);
2284       add_path_line (cr, x + 1, y, x + 1, y + height - 2);
2285       cairo_stroke (cr);
2286
2287       gdk_cairo_set_source_rgba (cr, &darker);
2288       add_path_line (cr, x + 2, y + height - 2, x + width - 2, y + height - 2);
2289       add_path_line (cr, x + width - 2, y, x + width - 2, y + height - 2);
2290       cairo_stroke (cr);
2291
2292       cairo_set_source_rgb (cr, 0, 0, 0);
2293       add_path_line (cr, x + 1, y + height - 1, x + width - 2, y + height - 1);
2294       add_path_line (cr, x + width - 1, y, x + width - 1, y + height - 2);
2295       cairo_stroke (cr);
2296
2297       break;
2298     case GTK_POS_BOTTOM:
2299       gdk_cairo_set_source_rgba(cr, bg_color);
2300       cairo_rectangle (cr, x + 1, y, width - 2, height);
2301       cairo_fill (cr);
2302
2303       gdk_cairo_set_source_rgba (cr, &lighter);
2304       add_path_line (cr, x + 1, y, x + width - 2, y);
2305       add_path_line (cr, x, y + 1, x, y + height - 1);
2306       cairo_stroke (cr);
2307
2308       gdk_cairo_set_source_rgba (cr, bg_color);
2309       add_path_line (cr, x + 1, y + 1, x + width - 2, y + 1);
2310       add_path_line (cr, x + 1, y + 1, x + 1, y + height - 1);
2311       cairo_stroke (cr);
2312
2313       gdk_cairo_set_source_rgba (cr, &darker);
2314       add_path_line (cr, x + width - 2, y + 2, x + width - 2, y + height - 1);
2315       cairo_stroke (cr);
2316
2317       cairo_set_source_rgb (cr, 0, 0, 0);
2318       add_path_line (cr, x + width - 1, y + 1, x + width - 1, y + height - 1);
2319       cairo_stroke (cr);
2320
2321       break;
2322     case GTK_POS_LEFT:
2323       gdk_cairo_set_source_rgba (cr, bg_color);
2324       cairo_rectangle (cr, x, y + 1, width, height - 2);
2325       cairo_fill (cr);
2326
2327       gdk_cairo_set_source_rgba (cr, &lighter);
2328       add_path_line (cr, x, y, x + width - 2, y);
2329       cairo_stroke (cr);
2330
2331       gdk_cairo_set_source_rgba (cr, bg_color);
2332       add_path_line (cr, x + 1, y + 1, x + width - 2, y + 1);
2333       cairo_stroke (cr);
2334
2335       gdk_cairo_set_source_rgba (cr, &darker);
2336       add_path_line (cr, x, y + height - 2, x + width - 2, y + height - 2);
2337       add_path_line (cr, x + width - 2, y + 2, x + width - 2, y + height - 2);
2338       cairo_stroke (cr);
2339
2340       cairo_set_source_rgb (cr, 0, 0, 0);
2341       add_path_line (cr, x, y + height - 1, x + width - 2, y + height - 1);
2342       add_path_line (cr, x + width - 1, y + 1, x + width - 1, y + height - 2);
2343       cairo_stroke (cr);
2344
2345       break;
2346     case GTK_POS_RIGHT:
2347       gdk_cairo_set_source_rgba (cr, bg_color);
2348       cairo_rectangle (cr, x, y + 1, width, height - 2);
2349       cairo_fill (cr);
2350
2351       gdk_cairo_set_source_rgba (cr, &lighter);
2352       add_path_line (cr, x + 1, y, x + width - 1, y);
2353       add_path_line (cr, x, y + 1, x, y + height - 2);
2354       cairo_stroke (cr);
2355
2356       gdk_cairo_set_source_rgba (cr, bg_color);
2357       add_path_line (cr, x + 1, y + 1, x + width - 1, y + 1);
2358       add_path_line (cr, x + 1, y + 1, x + 1, y + height - 2);
2359       cairo_stroke (cr);
2360
2361       gdk_cairo_set_source_rgba (cr, &darker);
2362       add_path_line (cr, x + 2, y + height - 2, x + width - 1, y + height - 2);
2363       cairo_stroke (cr);
2364
2365       cairo_set_source_rgb (cr, 0, 0, 0);
2366       add_path_line (cr, x + 1, y + height - 1, x + width - 1, y + height - 1);
2367       cairo_stroke (cr);
2368
2369       break;
2370     }
2371
2372   cairo_restore (cr);
2373
2374   gdk_rgba_free (bg_color);
2375 }
2376
2377 static void
2378 render_dot (cairo_t       *cr,
2379             const GdkRGBA *lighter,
2380             const GdkRGBA *darker,
2381             gdouble        x,
2382             gdouble        y,
2383             gdouble        size)
2384 {
2385   size = CLAMP ((gint) size, 2, 3);
2386
2387   if (size == 2)
2388     {
2389       gdk_cairo_set_source_rgba (cr, lighter);
2390       cairo_rectangle (cr, x, y, 1, 1);
2391       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2392       cairo_fill (cr);
2393     }
2394   else if (size == 3)
2395     {
2396       gdk_cairo_set_source_rgba (cr, lighter);
2397       cairo_rectangle (cr, x, y, 2, 1);
2398       cairo_rectangle (cr, x, y, 1, 2);
2399       cairo_fill (cr);
2400
2401       gdk_cairo_set_source_rgba (cr, darker);
2402       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2403       cairo_rectangle (cr, x + 2, y, 1, 2);
2404       cairo_fill (cr);
2405     }
2406 }
2407
2408 static void
2409 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2410                                   cairo_t          *cr,
2411                                   gdouble           x,
2412                                   gdouble           y,
2413                                   gdouble           width,
2414                                   gdouble           height)
2415 {
2416   GtkStateFlags flags;
2417   GdkRGBA *bg_color;
2418   GdkRGBA lighter, darker;
2419   gint xx, yy;
2420
2421   cairo_save (cr);
2422   flags = gtk_theming_engine_get_state (engine);
2423
2424   cairo_set_line_width (cr, 1);
2425
2426   gtk_theming_engine_get (engine, flags,
2427                           "background-color", &bg_color,
2428                           NULL);
2429   color_shade (bg_color, 0.7, &darker);
2430   color_shade (bg_color, 1.3, &lighter);
2431
2432   gdk_cairo_set_source_rgba (cr, bg_color);
2433   cairo_rectangle (cr, x, y, width, height);
2434   cairo_fill (cr);
2435
2436   if (gtk_theming_engine_has_class (engine, "grip"))
2437     {
2438       GtkJunctionSides sides;
2439       gint skip = -1;
2440
2441       cairo_save (cr);
2442
2443       cairo_set_line_width (cr, 1.0);
2444       sides = gtk_theming_engine_get_junction_sides (engine);
2445
2446       /* reduce confusing values to a meaningful state */
2447       if (sides & (GTK_JUNCTION_LEFT | GTK_JUNCTION_RIGHT))
2448         sides &= ~(GTK_JUNCTION_LEFT);
2449
2450       if (sides & (GTK_JUNCTION_TOP | GTK_JUNCTION_BOTTOM))
2451         sides &= ~(GTK_JUNCTION_TOP);
2452
2453       if (sides == 0)
2454         sides = (GTK_JUNCTION_BOTTOM | GTK_JUNCTION_RIGHT);
2455
2456       /* align drawing area to the connected side */
2457       if (sides == GTK_JUNCTION_LEFT)
2458         {
2459           if (height < width)
2460             width = height;
2461         }
2462       else if (sides & (GTK_JUNCTION_LEFT | GTK_JUNCTION_TOP))
2463         {
2464           if (width < height)
2465             height = width;
2466           else if (height < width)
2467             width = height;
2468
2469           skip = 2;
2470         }
2471       else if (sides & (GTK_JUNCTION_LEFT | GTK_JUNCTION_BOTTOM))
2472         {
2473           /* make it square, aligning to bottom left */
2474           if (width < height)
2475             {
2476               y += (height - width);
2477               height = width;
2478             }
2479           else if (height < width)
2480             width = height;
2481
2482           skip = 1;
2483         }
2484       if (sides == GTK_JUNCTION_RIGHT)
2485         {
2486           /* aligning to right */
2487           if (height < width)
2488             {
2489               x += (width - height);
2490               width = height;
2491             }
2492         }
2493       else if (sides & (GTK_JUNCTION_RIGHT | GTK_JUNCTION_TOP))
2494         {
2495           if (width < height)
2496             height = width;
2497           else if (height < width)
2498             {
2499               x += (width - height);
2500               width = height;
2501             }
2502
2503           skip = 3;
2504         }
2505       else if (sides & (GTK_JUNCTION_RIGHT | GTK_JUNCTION_BOTTOM))
2506         {
2507           /* make it square, aligning to bottom right */
2508           if (width < height)
2509             {
2510               y += (height - width);
2511               height = width;
2512             }
2513           else if (height < width)
2514             {
2515               x += (width - height);
2516               width = height;
2517             }
2518
2519           skip = 0;
2520         }
2521       else if (sides == GTK_JUNCTION_TOP)
2522         {
2523           if (width < height)
2524             height = width;
2525         }
2526       else if (sides == GTK_JUNCTION_BOTTOM)
2527         {
2528           /* align to bottom */
2529           if (width < height)
2530             {
2531               y += (height - width);
2532               height = width;
2533             }
2534         }
2535       else
2536         g_assert_not_reached ();
2537
2538       if (sides == GTK_JUNCTION_LEFT ||
2539           sides == GTK_JUNCTION_RIGHT)
2540         {
2541           gint xi;
2542
2543           xi = x;
2544
2545           while (xi < x + width)
2546             {
2547               gdk_cairo_set_source_rgba (cr, &lighter);
2548               add_path_line (cr, x, y, x, y + height);
2549               cairo_stroke (cr);
2550               xi++;
2551
2552               gdk_cairo_set_source_rgba (cr, &darker);
2553               add_path_line (cr, xi, y, xi, y + height);
2554               cairo_stroke (cr);
2555               xi += 2;
2556             }
2557         }
2558       else if (sides == GTK_JUNCTION_TOP ||
2559                sides == GTK_JUNCTION_BOTTOM)
2560         {
2561           gint yi;
2562
2563           yi = y;
2564
2565           while (yi < y + height)
2566             {
2567               gdk_cairo_set_source_rgba (cr, &lighter);
2568               add_path_line (cr, x, yi, x + width, yi);
2569               cairo_stroke (cr);
2570               yi++;
2571
2572               gdk_cairo_set_source_rgba (cr, &darker);
2573               add_path_line (cr, x, yi, x + width, yi);
2574               cairo_stroke (cr);
2575               yi+= 2;
2576             }
2577         }
2578       else if (sides == (GTK_JUNCTION_TOP | GTK_JUNCTION_LEFT))
2579         {
2580           gint xi, yi;
2581
2582           xi = x + width;
2583           yi = y + height;
2584
2585           while (xi > x + 3)
2586             {
2587               gdk_cairo_set_source_rgba (cr, &darker);
2588               add_path_line (cr, xi, y, x, yi);
2589               cairo_stroke (cr);
2590
2591               --xi;
2592               --yi;
2593
2594               add_path_line (cr, xi, y, x, yi);
2595               cairo_stroke (cr);
2596
2597               --xi;
2598               --yi;
2599
2600               gdk_cairo_set_source_rgba (cr, &lighter);
2601               add_path_line (cr, xi, y, x, yi);
2602               cairo_stroke (cr);
2603
2604               xi -= 3;
2605               yi -= 3;
2606             }
2607         }
2608       else if (sides == (GTK_JUNCTION_TOP | GTK_JUNCTION_RIGHT))
2609         {
2610           gint xi, yi;
2611
2612           xi = x;
2613           yi = y + height;
2614
2615           while (xi < (x + width - 3))
2616             {
2617               gdk_cairo_set_source_rgba (cr, &lighter);
2618               add_path_line (cr, xi, y, x + width, yi);
2619               cairo_stroke (cr);
2620
2621               ++xi;
2622               --yi;
2623
2624               gdk_cairo_set_source_rgba (cr, &darker);
2625               add_path_line (cr, xi, y, x + width, yi);
2626               cairo_stroke (cr);
2627
2628               ++xi;
2629               --yi;
2630
2631               add_path_line (cr, xi, y, x + width, yi);
2632               cairo_stroke (cr);
2633
2634               xi += 3;
2635               yi -= 3;
2636             }
2637         }
2638       else if (sides == (GTK_JUNCTION_BOTTOM | GTK_JUNCTION_LEFT))
2639         {
2640           gint xi, yi;
2641
2642           xi = x + width;
2643           yi = y;
2644
2645           while (xi > x + 3)
2646             {
2647               gdk_cairo_set_source_rgba (cr, &darker);
2648               add_path_line (cr, x, yi, xi, y + height);
2649               cairo_stroke (cr);
2650
2651               --xi;
2652               ++yi;
2653
2654               add_path_line (cr, x, yi, xi, y + height);
2655               cairo_stroke (cr);
2656
2657               --xi;
2658               ++yi;
2659
2660               gdk_cairo_set_source_rgba (cr, &lighter);
2661               add_path_line (cr, x, yi, xi, y + height);
2662               cairo_stroke (cr);
2663
2664               xi -= 3;
2665               yi += 3;
2666             }
2667         }
2668       else if (sides == (GTK_JUNCTION_BOTTOM | GTK_JUNCTION_RIGHT))
2669         {
2670           gint xi, yi;
2671
2672           xi = x;
2673           yi = y;
2674
2675           while (xi < (x + width - 3))
2676             {
2677               gdk_cairo_set_source_rgba (cr, &lighter);
2678               add_path_line (cr, xi, y + height, x + width, yi);
2679               cairo_stroke (cr);
2680
2681               ++xi;
2682               ++yi;
2683
2684               gdk_cairo_set_source_rgba (cr, &darker);
2685               add_path_line (cr, xi, y + height, x + width, yi);
2686               cairo_stroke (cr);
2687
2688               ++xi;
2689               ++yi;
2690
2691               add_path_line (cr, xi, y + height, x + width, yi);
2692               cairo_stroke (cr);
2693
2694               xi += 3;
2695               yi += 3;
2696             }
2697         }
2698
2699       cairo_restore (cr);
2700     }
2701   else if (gtk_theming_engine_has_class (engine, "paned"))
2702     {
2703       if (width > height)
2704         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2705           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2706       else
2707         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2708           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2709     }
2710   else
2711     {
2712       for (yy = y; yy < y + height; yy += 3)
2713         for (xx = x; xx < x + width; xx += 6)
2714           {
2715             render_dot (cr, &lighter, &darker, xx, yy, 2);
2716             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2717           }
2718     }
2719
2720   cairo_restore (cr);
2721
2722   gdk_rgba_free (bg_color);
2723 }
2724
2725 static void
2726 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2727                                     cairo_t          *cr,
2728                                     gdouble           x,
2729                                     gdouble           y,
2730                                     gdouble           width,
2731                                     gdouble           height)
2732 {
2733   if (gtk_theming_engine_has_class (engine, "spinner"))
2734     {
2735       GtkStateFlags state;
2736       guint num_steps, step;
2737       GdkRGBA *color;
2738       gdouble dx, dy;
2739       gdouble progress;
2740       gdouble radius;
2741       gdouble half;
2742       gint i;
2743
2744       gtk_theming_engine_get_style (engine,
2745                                     "num-steps", &num_steps,
2746                                     NULL);
2747
2748       state = gtk_theming_engine_get_state (engine);
2749       gtk_theming_engine_get (engine, state,
2750                               "color", &color,
2751                               NULL);
2752       if (num_steps == 0)
2753         num_steps = 12;
2754
2755       if (gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
2756         step = (guint) (progress * num_steps);
2757       else
2758         step = 0;
2759
2760       cairo_save (cr);
2761
2762       cairo_translate (cr, x, y);
2763
2764       /* draw clip region */
2765       cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2766
2767       dx = width / 2;
2768       dy = height / 2;
2769       radius = MIN (width / 2, height / 2);
2770       half = num_steps / 2;
2771
2772       for (i = 0; i < num_steps; i++)
2773         {
2774           gint inset = 0.7 * radius;
2775
2776           /* transparency is a function of time and intial value */
2777           gdouble t = (gdouble) ((i + num_steps - step)
2778                                  % num_steps) / num_steps;
2779
2780           cairo_save (cr);
2781
2782           cairo_set_source_rgba (cr,
2783                                  color->red,
2784                                  color->green,
2785                                  color->blue,
2786                                  color->alpha * t);
2787
2788           cairo_set_line_width (cr, 2.0);
2789           cairo_move_to (cr,
2790                          dx + (radius - inset) * cos (i * G_PI / half),
2791                          dy + (radius - inset) * sin (i * G_PI / half));
2792           cairo_line_to (cr,
2793                          dx + radius * cos (i * G_PI / half),
2794                          dy + radius * sin (i * G_PI / half));
2795           cairo_stroke (cr);
2796
2797           cairo_restore (cr);
2798         }
2799
2800       cairo_restore (cr);
2801
2802       gdk_rgba_free (color);
2803     }
2804   else
2805     {
2806       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2807       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2808     }
2809 }