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 static GdkPixbuf * gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
 172                                                           const GtkIconSource *source,
 173                                                           GtkIconSize          size);
 174
 175 G_DEFINE_TYPE (GtkThemingEngine, gtk_theming_engine, G_TYPE_OBJECT)
 176
 177
 178 typedef struct GtkThemingModule GtkThemingModule;
 179 typedef struct GtkThemingModuleClass GtkThemingModuleClass;
 180
 181 struct GtkThemingModule
 182 {
 183   GTypeModule parent_instance;
 184   GModule *module;
 185   gchar *name;
 186
 187   void (*init) (GTypeModule *module);
 188   void (*exit) (void);
 189   GtkThemingEngine * (*create_engine) (void);
 190 };
 191
 192 struct GtkThemingModuleClass
 193 {
 194   GTypeModuleClass parent_class;
 195 };
 196
 197 #define GTK_TYPE_THEMING_MODULE  (gtk_theming_module_get_type ())
 198 #define GTK_THEMING_MODULE(o)    (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_THEMING_MODULE, GtkThemingModule))
 199 #define GTK_IS_THEMING_MODULE(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_THEMING_MODULE))
 200
 201 G_DEFINE_TYPE (GtkThemingModule, gtk_theming_module, G_TYPE_TYPE_MODULE);
 202
 203 static void
 204 gtk_theming_engine_class_init (GtkThemingEngineClass *klass)
 205 {
 206   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 207
 208   object_class->finalize = gtk_theming_engine_finalize;
 209   object_class->set_property = gtk_theming_engine_impl_set_property;
 210   object_class->get_property = gtk_theming_engine_impl_get_property;
 211
 212   klass->render_check = gtk_theming_engine_render_check;
 213   klass->render_option = gtk_theming_engine_render_option;
 214   klass->render_arrow = gtk_theming_engine_render_arrow;
 215   klass->render_background = gtk_theming_engine_render_background;
 216   klass->render_frame = gtk_theming_engine_render_frame;
 217   klass->render_expander = gtk_theming_engine_render_expander;
 218   klass->render_focus = gtk_theming_engine_render_focus;
 219   klass->render_layout = gtk_theming_engine_render_layout;
 220   klass->render_line = gtk_theming_engine_render_line;
 221   klass->render_slider = gtk_theming_engine_render_slider;
 222   klass->render_frame_gap = gtk_theming_engine_render_frame_gap;
 223   klass->render_extension = gtk_theming_engine_render_extension;
 224   klass->render_handle = gtk_theming_engine_render_handle;
 225   klass->render_activity = gtk_theming_engine_render_activity;
 226   klass->render_icon_pixbuf = gtk_theming_engine_render_icon_pixbuf;
 227
 228   /**
 229    * GtkThemingEngine:name:
 230    *
 231    * The theming engine name, this name will be used when registering
 232    * custom properties, for a theming engine named "Clearlooks" registering
 233    * a "glossy" custom property, it could be referenced in the CSS file as
 234    *
 235    * <programlisting>
 236    * -Clearlooks-glossy: true;
 237    * </programlisting>
 238    *
 239    * Since: 3.0
 240    */
 241   g_object_class_install_property (object_class,
 242                                    PROP_NAME,
 243                                    g_param_spec_string ("name",
 244                                                         P_("Name"),
 245                                                         P_("Theming engine name"),
 246                                                         NULL,
 247                                                         G_PARAM_CONSTRUCT_ONLY | GTK_PARAM_READWRITE));
 248
 249   g_type_class_add_private (object_class, sizeof (GtkThemingEnginePrivate));
 250 }
 251
 252 static void
 253 gtk_theming_engine_init (GtkThemingEngine *engine)
 254 {
 255   engine->priv = GTK_THEMING_ENGINE_GET_PRIVATE (engine);
 256 }
 257
 258 static void
 259 gtk_theming_engine_finalize (GObject *object)
 260 {
 261   GtkThemingEnginePrivate *priv;
 262
 263   priv = GTK_THEMING_ENGINE (object)->priv;
 264   g_free (priv->name);
 265
 266   G_OBJECT_GET_CLASS (gtk_theming_engine_parent_class)->finalize (object);
 267 }
 268
 269 static void
 270 gtk_theming_engine_impl_set_property (GObject      *object,
 271                                       guint         prop_id,
 272                                       const GValue *value,
 273                                       GParamSpec   *pspec)
 274 {
 275   GtkThemingEnginePrivate *priv;
 276
 277   priv = GTK_THEMING_ENGINE (object)->priv;
 278
 279   switch (prop_id)
 280     {
 281     case PROP_NAME:
 282       if (priv->name)
 283         g_free (priv->name);
 284
 285       priv->name = g_value_dup_string (value);
 286       break;
 287     default:
 288       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 289       break;
 290     }
 291 }
 292
 293 static void
 294 gtk_theming_engine_impl_get_property (GObject    *object,
 295                                       guint       prop_id,
 296                                       GValue     *value,
 297                                       GParamSpec *pspec)
 298 {
 299   GtkThemingEnginePrivate *priv;
 300
 301   priv = GTK_THEMING_ENGINE (object)->priv;
 302
 303   switch (prop_id)
 304     {
 305     case PROP_NAME:
 306       g_value_set_string (value, priv->name);
 307       break;
 308     default:
 309       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 310       break;
 311     }
 312 }
 313
 314 void
 315 _gtk_theming_engine_set_context (GtkThemingEngine *engine,
 316                                  GtkStyleContext  *context)
 317 {
 318   GtkThemingEnginePrivate *priv;
 319
 320   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 321   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
 322
 323   priv = engine->priv;
 324   priv->context = context;
 325 }
 326
 327 /**
 328  * gtk_theming_engine_register_property:
 329  * @engine: a #GtkThemingEngine
 330  * @property_name: property name to register
 331  * @type: #GType the property will hold
 332  * @default_value: default value for this property
 333  * @parse_func: parsing function to use, or %NULL
 334  *
 335  * Registers a property so it can be used in the CSS file format,
 336  * on the CSS file the property will look like
 337  * "-${engine-object-name}-${@property_name}". being
 338  * ${engine-object-name} either the GtkThemingEngine:name property
 339  * or G_OBJECT_TYPE_NAME(engine) if the property is unset.
 340  *
 341  * For any type a @parse_func may be provided, being this function
 342  * used for turning any property value (between ':' and ';') in
 343  * CSS to the #GValue needed. For basic types there is already
 344  * builtin parsing support, so %NULL may be provided for these
 345  * cases.
 346  *
 347  * <note>
 348  * This function needs to be called only once during theming
 349  * engine object initialization.
 350  * </note>
 351  *
 352  * <note>
 353  * In order to make use of the custom registered properties in
 354  * the CSS file, make sure the engine is loaded first either in
 355  * a previous rule or within the same one.
 356  * <programlisting>
 357  * &ast; {
 358  *     engine: someengine;
 359  *     SomeEngine-custom-property: 2;
 360  * }
 361  * </programlisting>
 362  * </note>
 363  *
 364  * Since: 3.0
 365  **/
 366 void
 367 gtk_theming_engine_register_property (GtkThemingEngine       *engine,
 368                                       const gchar            *property_name,
 369                                       GType                   type,
 370                                       const GValue           *default_value,
 371                                       GtkStylePropertyParser  parse_func)
 372 {
 373   GtkThemingEnginePrivate *priv;
 374   const gchar *engine_name;
 375   gchar *name;
 376
 377   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 378   g_return_if_fail (property_name != NULL);
 379   g_return_if_fail (type != G_TYPE_INVALID);
 380   g_return_if_fail (default_value == NULL || G_IS_VALUE (default_value));
 381
 382   priv = engine->priv;
 383
 384   if (priv->name)
 385     engine_name = priv->name;
 386   else
 387     engine_name = G_OBJECT_TYPE_NAME (engine);
 388
 389   name = g_strdup_printf ("-%s-%s", engine_name, property_name);
 390   gtk_style_properties_register_property (name, type, default_value, parse_func);
 391   g_free (name);
 392 }
 393
 394 /**
 395  * gtk_theming_engine_get_property:
 396  * @engine: a #GtkThemingEngine
 397  * @property: the property name
 398  * @state: state to retrieve the value for
 399  * @value: (out) (transfer full): return location for the property value,
 400  *         you must free this memory using g_value_unset() once you are
 401  *         done with it.
 402  *
 403  * Gets a property value as retrieved from the style settings that apply
 404  * to the currently rendered element.
 405  *
 406  * Since: 3.0
 407  **/
 408 void
 409 gtk_theming_engine_get_property (GtkThemingEngine *engine,
 410                                  const gchar      *property,
 411                                  GtkStateFlags     state,
 412                                  GValue           *value)
 413 {
 414   GtkThemingEnginePrivate *priv;
 415
 416   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 417   g_return_if_fail (property != NULL);
 418   g_return_if_fail (value != NULL);
 419
 420   priv = engine->priv;
 421   gtk_style_context_get_property (priv->context, property, state, value);
 422 }
 423
 424 /**
 425  * gtk_theming_engine_get_valist:
 426  * @engine: a #GtkThemingEngine
 427  * @state: state to retrieve values for
 428  * @args: va_list of property name/return location pairs, followed by %NULL
 429  *
 430  * Retrieves several style property values that apply to the currently
 431  * rendered element.
 432  *
 433  * Since: 3.0
 434  **/
 435 void
 436 gtk_theming_engine_get_valist (GtkThemingEngine *engine,
 437                                GtkStateFlags     state,
 438                                va_list           args)
 439 {
 440   GtkThemingEnginePrivate *priv;
 441
 442   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 443
 444   priv = engine->priv;
 445   gtk_style_context_get_valist (priv->context, state, args);
 446 }
 447
 448 /**
 449  * gtk_theming_engine_get:
 450  * @engine: a #GtkThemingEngine
 451  * @state: state to retrieve values for
 452  * @...: property name /return value pairs, followed by %NULL
 453  *
 454  * Retrieves several style property values that apply to the currently
 455  * rendered element.
 456  *
 457  * Since: 3.0
 458  **/
 459 void
 460 gtk_theming_engine_get (GtkThemingEngine *engine,
 461                         GtkStateFlags     state,
 462                         ...)
 463 {
 464   GtkThemingEnginePrivate *priv;
 465   va_list args;
 466
 467   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 468
 469   priv = engine->priv;
 470
 471   va_start (args, state);
 472   gtk_style_context_get_valist (priv->context, state, args);
 473   va_end (args);
 474 }
 475
 476 /**
 477  * gtk_theming_engine_get_style_property:
 478  * @engine: a #GtkThemingEngine
 479  * @property_name: the name of the widget style property
 480  * @value: (out) (transfer full): Return location for the property value, free with
 481  *         g_value_unset() after use.
 482  *
 483  * Gets the value for a widget style property.
 484  *
 485  * Since: 3.0
 486  **/
 487 void
 488 gtk_theming_engine_get_style_property (GtkThemingEngine *engine,
 489                                        const gchar      *property_name,
 490                                        GValue           *value)
 491 {
 492   GtkThemingEnginePrivate *priv;
 493
 494   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 495   g_return_if_fail (property_name != NULL);
 496
 497   priv = engine->priv;
 498   gtk_style_context_get_style_property (priv->context, property_name, value);
 499 }
 500
 501 /**
 502  * gtk_theming_engine_get_style_valist:
 503  * @engine: a #GtkThemingEngine
 504  * @args: va_list of property name/return location pairs, followed by %NULL
 505  *
 506  * Retrieves several widget style properties from @engine according to the
 507  * currently rendered content's style.
 508  *
 509  * Since: 3.0
 510  **/
 511 void
 512 gtk_theming_engine_get_style_valist (GtkThemingEngine *engine,
 513                                      va_list           args)
 514 {
 515   GtkThemingEnginePrivate *priv;
 516
 517   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 518
 519   priv = engine->priv;
 520   gtk_style_context_get_style_valist (priv->context, args);
 521 }
 522
 523 /**
 524  * gtk_theming_engine_get_style:
 525  * @engine: a #GtkThemingEngine
 526  * @...: property name /return value pairs, followed by %NULL
 527  *
 528  * Retrieves several widget style properties from @engine according
 529  * to the currently rendered content's style.
 530  *
 531  * Since: 3.0
 532  **/
 533 void
 534 gtk_theming_engine_get_style (GtkThemingEngine *engine,
 535                               ...)
 536 {
 537   GtkThemingEnginePrivate *priv;
 538   va_list args;
 539
 540   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 541
 542   priv = engine->priv;
 543
 544   va_start (args, engine);
 545   gtk_style_context_get_style_valist (priv->context, args);
 546   va_end (args);
 547 }
 548
 549 /**
 550  * gtk_theming_engine_get_state:
 551  * @engine: a #GtkThemingEngine
 552  *
 553  * returns the state used when rendering.
 554  *
 555  * Returns: the state flags
 556  *
 557  * Since: 3.0
 558  **/
 559 GtkStateFlags
 560 gtk_theming_engine_get_state (GtkThemingEngine *engine)
 561 {
 562   GtkThemingEnginePrivate *priv;
 563
 564   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 565
 566   priv = engine->priv;
 567   return gtk_style_context_get_state (priv->context);
 568 }
 569
 570 /**
 571  * gtk_theming_engine_state_is_running:
 572  * @engine: a #GtkThemingEngine
 573  * @state: a widget state
 574  * @progress: (out): return location for the transition progress
 575  *
 576  * Returns %TRUE if there is a transition animation running for the
 577  * current region (see gtk_style_context_push_animatable_region()).
 578  *
 579  * If @progress is not %NULL, the animation progress will be returned
 580  * there, 0.0 means the state is closest to being %FALSE, while 1.0 means
 581  * it's closest to being %TRUE. This means transition animations will
 582  * run from 0 to 1 when @state is being set to %TRUE and from 1 to 0 when
 583  * it's being set to %FALSE.
 584  *
 585  * Returns: %TRUE if there is a running transition animation for @state.
 586  *
 587  * Since: 3.0
 588  **/
 589 gboolean
 590 gtk_theming_engine_state_is_running (GtkThemingEngine *engine,
 591                                      GtkStateType      state,
 592                                      gdouble          *progress)
 593 {
 594   GtkThemingEnginePrivate *priv;
 595
 596   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 597
 598   priv = engine->priv;
 599   return gtk_style_context_state_is_running (priv->context, state, progress);
 600 }
 601
 602 /**
 603  * gtk_theming_engine_get_path:
 604  * @engine: a #GtkThemingEngine
 605  *
 606  * Returns the widget path used for style matching.
 607  *
 608  * Returns: (transfer none): A #GtkWidgetPath
 609  *
 610  * Since: 3.0
 611  **/
 612 G_CONST_RETURN GtkWidgetPath *
 613 gtk_theming_engine_get_path (GtkThemingEngine *engine)
 614 {
 615   GtkThemingEnginePrivate *priv;
 616
 617   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 618
 619   priv = engine->priv;
 620   return gtk_style_context_get_path (priv->context);
 621 }
 622
 623 /**
 624  * gtk_theming_engine_has_class:
 625  * @engine: a #GtkThemingEngine
 626  * @style_class: class name to look up
 627  *
 628  * Returns %TRUE if the currently rendered contents have
 629  * defined the given class name.
 630  *
 631  * Returns: %TRUE if @engine has @class_name defined
 632  *
 633  * Since: 3.0
 634  **/
 635 gboolean
 636 gtk_theming_engine_has_class (GtkThemingEngine *engine,
 637                               const gchar      *style_class)
 638 {
 639   GtkThemingEnginePrivate *priv;
 640
 641   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 642
 643   priv = engine->priv;
 644   return gtk_style_context_has_class (priv->context, style_class);
 645 }
 646
 647 /**
 648  * gtk_theming_engine_has_region:
 649  * @engine: a #GtkThemingEngine
 650  * @style_region: a region name
 651  * @flags: (out) (allow-none): return location for region flags
 652  *
 653  * Returns %TRUE if the currently rendered contents have the
 654  * region defined. If @flags_return is not %NULL, it is set
 655  * to the flags affecting the region.
 656  *
 657  * Returns: %TRUE if region is defined
 658  *
 659  * Since: 3.0
 660  **/
 661 gboolean
 662 gtk_theming_engine_has_region (GtkThemingEngine *engine,
 663                                const gchar      *style_region,
 664                                GtkRegionFlags   *flags)
 665 {
 666   GtkThemingEnginePrivate *priv;
 667
 668   if (flags)
 669     *flags = 0;
 670
 671   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 672
 673   priv = engine->priv;
 674   return gtk_style_context_has_region (priv->context, style_region, flags);
 675 }
 676
 677 /**
 678  * gtk_theming_engine_get_direction:
 679  * @engine: a #GtkThemingEngine
 680  *
 681  * Returns the widget direction used for rendering.
 682  *
 683  * Returns: the widget direction
 684  *
 685  * Since: 3.0
 686  **/
 687 GtkTextDirection
 688 gtk_theming_engine_get_direction (GtkThemingEngine *engine)
 689 {
 690   GtkThemingEnginePrivate *priv;
 691
 692   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), GTK_TEXT_DIR_LTR);
 693
 694   priv = engine->priv;
 695   return gtk_style_context_get_direction (priv->context);
 696 }
 697
 698 /**
 699  * gtk_theming_engine_get_junction_sides:
 700  * @engine: a #GtkThemingEngine
 701  *
 702  * Returns the widget direction used for rendering.
 703  *
 704  * Returns: the widget direction
 705  *
 706  * Since: 3.0
 707  **/
 708 GtkJunctionSides
 709 gtk_theming_engine_get_junction_sides (GtkThemingEngine *engine)
 710 {
 711   GtkThemingEnginePrivate *priv;
 712
 713   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 714
 715   priv = engine->priv;
 716   return gtk_style_context_get_junction_sides (priv->context);
 717 }
 718
 719 /* GtkThemingModule */
 720
 721 static gboolean
 722 gtk_theming_module_load (GTypeModule *type_module)
 723 {
 724   GtkThemingModule *theming_module;
 725   GModule *module;
 726   gchar *name, *module_path;
 727
 728   theming_module = GTK_THEMING_MODULE (type_module);
 729   name = theming_module->name;
 730   module_path = _gtk_find_module (name, "theming-engines");
 731
 732   if (!module_path)
 733     {
 734       g_warning (_("Unable to locate theme engine in module path: \"%s\","), name);
 735       return FALSE;
 736     }
 737
 738   module = g_module_open (module_path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 739   g_free (module_path);
 740
 741   if (!module)
 742     {
 743       g_warning ("%s", g_module_error ());
 744       return FALSE;
 745     }
 746
 747   if (!g_module_symbol (module, "theme_init",
 748                         (gpointer *) &theming_module->init) ||
 749       !g_module_symbol (module, "theme_exit",
 750                         (gpointer *) &theming_module->exit) ||
 751       !g_module_symbol (module, "create_engine",
 752                         (gpointer *) &theming_module->create_engine))
 753     {
 754       g_warning ("%s", g_module_error ());
 755       g_module_close (module);
 756
 757       return FALSE;
 758     }
 759
 760   theming_module->module = module;
 761
 762   theming_module->init (G_TYPE_MODULE (theming_module));
 763
 764   return TRUE;
 765 }
 766
 767 static void
 768 gtk_theming_module_unload (GTypeModule *type_module)
 769 {
 770   GtkThemingModule *theming_module;
 771
 772   theming_module = GTK_THEMING_MODULE (type_module);
 773
 774   theming_module->exit ();
 775
 776   g_module_close (theming_module->module);
 777
 778   theming_module->module = NULL;
 779   theming_module->init = NULL;
 780   theming_module->exit = NULL;
 781   theming_module->create_engine = NULL;
 782 }
 783
 784 static void
 785 gtk_theming_module_class_init (GtkThemingModuleClass *klass)
 786 {
 787   GTypeModuleClass *module_class = G_TYPE_MODULE_CLASS (klass);
 788
 789   module_class->load = gtk_theming_module_load;
 790   module_class->unload = gtk_theming_module_unload;
 791 }
 792
 793 static void
 794 gtk_theming_module_init (GtkThemingModule *module)
 795 {
 796 }
 797
 798 /**
 799  * gtk_theming_engine_load:
 800  * @name: Theme engine name to load
 801  *
 802  * Loads and initializes a theming engine module from the
 803  * standard directories.
 804  *
 805  * Returns: (transfer none): A theming engine, or %NULL if
 806  * the engine @name doesn't exist.
 807  **/
 808 GtkThemingEngine *
 809 gtk_theming_engine_load (const gchar *name)
 810 {
 811   static GHashTable *engines = NULL;
 812   static GtkThemingEngine *default_engine;
 813   GtkThemingEngine *engine = NULL;
 814
 815   if (name)
 816     {
 817       if (!engines)
 818         engines = g_hash_table_new (g_str_hash, g_str_equal);
 819
 820       engine = g_hash_table_lookup (engines, name);
 821
 822       if (!engine)
 823         {
 824           GtkThemingModule *module;
 825
 826           module = g_object_new (GTK_TYPE_THEMING_MODULE, NULL);
 827           g_type_module_set_name (G_TYPE_MODULE (module), name);
 828           module->name = g_strdup (name);
 829
 830           if (module && g_type_module_use (G_TYPE_MODULE (module)))
 831             {
 832               engine = (module->create_engine) ();
 833
 834               if (engine)
 835                 g_hash_table_insert (engines, module->name, engine);
 836             }
 837         }
 838     }
 839
 840   if (!engine)
 841     {
 842       if (G_UNLIKELY (!default_engine))
 843         default_engine = g_object_new (GTK_TYPE_THEMING_ENGINE, NULL);
 844
 845       engine = default_engine;
 846     }
 847
 848   return engine;
 849 }
 850
 851 /**
 852  * gtk_theming_engine_get_screen:
 853  * @engine: a #GtkThemingEngine
 854  *
 855  * Returns the #GdkScreen to which @engine currently rendering to.
 856  *
 857  * Returns: a #GdkScreen, or %NULL.
 858  **/
 859 GdkScreen *
 860 gtk_theming_engine_get_screen (GtkThemingEngine *engine)
 861 {
 862   GtkThemingEnginePrivate *priv;
 863
 864   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 865
 866   priv = engine->priv;
 867   return gtk_style_context_get_screen (priv->context);
 868 }
 869
 870 /* Paint method implementations */
 871 static void
 872 gtk_theming_engine_render_check (GtkThemingEngine *engine,
 873                                  cairo_t          *cr,
 874                                  gdouble           x,
 875                                  gdouble           y,
 876                                  gdouble           width,
 877                                  gdouble           height)
 878 {
 879   GdkRGBA *fg_color, *bg_color;
 880   const GtkWidgetPath *path;
 881   GtkStateFlags flags;
 882   gint exterior_size, interior_size, thickness, pad;
 883
 884   flags = gtk_theming_engine_get_state (engine);
 885   path = gtk_theming_engine_get_path (engine);
 886   cairo_save (cr);
 887
 888   gtk_theming_engine_get (engine, flags,
 889                           "color", &fg_color,
 890                           "background-color", &bg_color,
 891                           NULL);
 892
 893   exterior_size = MIN (width, height);
 894
 895   if (exterior_size % 2 == 0) /* Ensure odd */
 896     exterior_size -= 1;
 897
 898   /* FIXME: thickness */
 899   thickness = 1;
 900   pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
 901   interior_size = MAX (1, exterior_size - 2 * pad);
 902
 903   if (interior_size < 7)
 904     {
 905       interior_size = 7;
 906       pad = MAX (0, (exterior_size - interior_size) / 2);
 907     }
 908
 909   x -= (1 + exterior_size - (gint) width) / 2;
 910   y -= (1 + exterior_size - (gint) height) / 2;
 911
 912   if (!gtk_theming_engine_has_class (engine, "menu"))
 913     {
 914       cairo_set_line_width (cr, 1.0);
 915
 916       cairo_rectangle (cr, x + 0.5, y + 0.5, exterior_size - 1, exterior_size - 1);
 917       gdk_cairo_set_source_rgba (cr, bg_color);
 918       cairo_fill_preserve (cr);
 919
 920       gdk_cairo_set_source_rgba (cr, fg_color);
 921
 922       cairo_stroke (cr);
 923     }
 924
 925   gdk_cairo_set_source_rgba (cr, fg_color);
 926
 927   if (flags & GTK_STATE_FLAG_INCONSISTENT)
 928     {
 929       int line_thickness = MAX (1, (3 + interior_size * 2) / 7);
 930
 931       cairo_rectangle (cr,
 932                        x + pad,
 933                        y + pad + (1 + interior_size - line_thickness) / 2,
 934                        interior_size,
 935                        line_thickness);
 936       cairo_fill (cr);
 937     }
 938   else
 939     {
 940       gdouble progress;
 941       gboolean running;
 942
 943       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
 944
 945       if ((flags & GTK_STATE_FLAG_ACTIVE) || running)
 946         {
 947           if (!running)
 948             progress = 1;
 949
 950           cairo_translate (cr,
 951                            x + pad, y + pad);
 952
 953           cairo_scale (cr, interior_size / 7., interior_size / 7.);
 954
 955           cairo_rectangle (cr, 0, 0, 7 * progress, 7);
 956           cairo_clip (cr);
 957
 958           cairo_move_to  (cr, 7.0, 0.0);
 959           cairo_line_to  (cr, 7.5, 1.0);
 960           cairo_curve_to (cr, 5.3, 2.0,
 961                           4.3, 4.0,
 962                           3.5, 7.0);
 963           cairo_curve_to (cr, 3.0, 5.7,
 964                           1.3, 4.7,
 965                           0.0, 4.7);
 966           cairo_line_to  (cr, 0.2, 3.5);
 967           cairo_curve_to (cr, 1.1, 3.5,
 968                           2.3, 4.3,
 969                           3.0, 5.0);
 970           cairo_curve_to (cr, 1.0, 3.9,
 971                           2.4, 4.1,
 972                           3.2, 4.9);
 973           cairo_curve_to (cr, 3.5, 3.1,
 974                           5.2, 2.0,
 975                           7.0, 0.0);
 976
 977           cairo_fill (cr);
 978         }
 979     }
 980
 981   cairo_restore (cr);
 982
 983   gdk_rgba_free (fg_color);
 984 }
 985
 986 static void
 987 gtk_theming_engine_render_option (GtkThemingEngine *engine,
 988                                   cairo_t          *cr,
 989                                   gdouble           x,
 990                                   gdouble           y,
 991                                   gdouble           width,
 992                                   gdouble           height)
 993 {
 994   GtkStateFlags flags;
 995   GdkRGBA *fg_color, *bg_color;
 996   const GtkWidgetPath *path;
 997   gint exterior_size, interior_size, pad, thickness;
 998   gdouble radius;
 999
1000   flags = gtk_theming_engine_get_state (engine);
1001   path = gtk_theming_engine_get_path (engine);
1002   radius = MIN (width, height) / 2 - 0.5;
1003
1004   cairo_save (cr);
1005
1006   gtk_theming_engine_get (engine, flags,
1007                           "color", &fg_color,
1008                           "background-color", &bg_color,
1009                           NULL);
1010
1011   exterior_size = MIN (width, height);
1012
1013   if (exterior_size % 2 == 0) /* Ensure odd */
1014     exterior_size -= 1;
1015
1016   x -= (1 + exterior_size - width) / 2;
1017   y -= (1 + exterior_size - height) / 2;
1018
1019   if (!gtk_theming_engine_has_class (engine, "menu"))
1020     {
1021       gdk_cairo_set_source_rgba (cr, bg_color);
1022
1023       cairo_arc (cr,
1024                  x + exterior_size / 2.,
1025                  y + exterior_size / 2.,
1026                  (exterior_size - 1) / 2.,
1027                  0, 2 * G_PI);
1028
1029       cairo_fill_preserve (cr);
1030
1031       gdk_cairo_set_source_rgba (cr, fg_color);
1032
1033       cairo_set_line_width (cr, 1.);
1034       cairo_stroke (cr);
1035     }
1036
1037   gdk_cairo_set_source_rgba (cr, fg_color);
1038
1039   /* FIXME: thickness */
1040   thickness = 1;
1041
1042   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1043     {
1044       gint line_thickness;
1045
1046       pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1047       interior_size = MAX (1, exterior_size - 2 * pad);
1048
1049       if (interior_size < 7)
1050         {
1051           interior_size = 7;
1052           pad = MAX (0, (exterior_size - interior_size) / 2);
1053         }
1054
1055       line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1056
1057       cairo_rectangle (cr,
1058                        x + pad,
1059                        y + pad + (interior_size - line_thickness) / 2.,
1060                        interior_size,
1061                        line_thickness);
1062       cairo_fill (cr);
1063     }
1064   if (flags & GTK_STATE_FLAG_ACTIVE)
1065     {
1066       pad = thickness + MAX (1, 2 * (exterior_size - 2 * thickness) / 9);
1067       interior_size = MAX (1, exterior_size - 2 * pad);
1068
1069       if (interior_size < 5)
1070         {
1071           interior_size = 7;
1072           pad = MAX (0, (exterior_size - interior_size) / 2);
1073         }
1074
1075       cairo_arc (cr,
1076                  x + pad + interior_size / 2.,
1077                  y + pad + interior_size / 2.,
1078                  interior_size / 2.,
1079                  0, 2 * G_PI);
1080       cairo_fill (cr);
1081     }
1082
1083   cairo_restore (cr);
1084
1085   gdk_rgba_free (fg_color);
1086   gdk_rgba_free (bg_color);
1087 }
1088
1089 static void
1090 add_path_arrow (cairo_t *cr,
1091                 gdouble  angle,
1092                 gdouble  x,
1093                 gdouble  y,
1094                 gdouble  size)
1095 {
1096   cairo_save (cr);
1097
1098   cairo_translate (cr, x + (size / 2), y + (size / 2));
1099   cairo_rotate (cr, angle);
1100
1101   cairo_move_to (cr, 0, - (size / 4));
1102   cairo_line_to (cr, - (size / 2), (size / 4));
1103   cairo_line_to (cr, (size / 2), (size / 4));
1104   cairo_close_path (cr);
1105
1106   cairo_restore (cr);
1107 }
1108
1109 static void
1110 gtk_theming_engine_render_arrow (GtkThemingEngine *engine,
1111                                  cairo_t          *cr,
1112                                  gdouble           angle,
1113                                  gdouble           x,
1114                                  gdouble           y,
1115                                  gdouble           size)
1116 {
1117   GtkStateFlags flags;
1118   GdkRGBA *fg_color;
1119
1120   cairo_save (cr);
1121
1122   flags = gtk_theming_engine_get_state (engine);
1123
1124   gtk_theming_engine_get (engine, flags,
1125                           "color", &fg_color,
1126                           NULL);
1127
1128   if (flags & GTK_STATE_FLAG_INSENSITIVE)
1129     {
1130       add_path_arrow (cr, angle, x + 1, y + 1, size);
1131       cairo_set_source_rgb (cr, 1, 1, 1);
1132       cairo_fill (cr);
1133     }
1134
1135   add_path_arrow (cr, angle, x, y, size);
1136   gdk_cairo_set_source_rgba (cr, fg_color);
1137   cairo_fill (cr);
1138
1139   cairo_restore (cr);
1140
1141   gdk_rgba_free (fg_color);
1142 }
1143
1144 static void
1145 add_path_line (cairo_t        *cr,
1146                gdouble         x1,
1147                gdouble         y1,
1148                gdouble         x2,
1149                gdouble         y2)
1150 {
1151   /* Adjust endpoints */
1152   if (y1 == y2)
1153     {
1154       y1 += 0.5;
1155       y2 += 0.5;
1156       x2 += 1;
1157     }
1158   else if (x1 == x2)
1159     {
1160       x1 += 0.5;
1161       x2 += 0.5;
1162       y2 += 1;
1163     }
1164
1165   cairo_move_to (cr, x1, y1);
1166   cairo_line_to (cr, x2, y2);
1167 }
1168
1169 static void
1170 add_path_rectangle_sides (cairo_t  *cr,
1171                           gdouble   x,
1172                           gdouble   y,
1173                           gdouble   width,
1174                           gdouble   height,
1175                           guint     sides)
1176 {
1177   if (sides & SIDE_TOP)
1178     {
1179       cairo_move_to (cr, x, y + 0.5);
1180       cairo_line_to (cr, x + width, y + 0.5);
1181     }
1182
1183   if (sides & SIDE_RIGHT)
1184     {
1185       cairo_move_to (cr, x + width - 0.5, y);
1186       cairo_line_to (cr, x + width - 0.5, y + height);
1187     }
1188
1189   if (sides & SIDE_BOTTOM)
1190     {
1191       cairo_move_to (cr, x, y + height - 0.5);
1192       cairo_line_to (cr, x + width, y + height - 0.5);
1193     }
1194
1195   if (sides & SIDE_LEFT)
1196     {
1197       cairo_move_to (cr, x + 0.5, y + height);
1198       cairo_line_to (cr, x + 0.5, y);
1199     }
1200 }
1201
1202 static void
1203 add_path_gap_side (cairo_t           *cr,
1204                    GtkPositionType    gap_side,
1205                    gdouble            x,
1206                    gdouble            y,
1207                    gdouble            width,
1208                    gdouble            height,
1209                    gdouble            xy0_gap,
1210                    gdouble            xy1_gap)
1211 {
1212   switch (gap_side)
1213     {
1214     case GTK_POS_TOP:
1215       add_path_line (cr, x, y, x + xy0_gap, y);
1216       add_path_line (cr, x + xy1_gap, y, x + width, y);
1217       break;
1218     case GTK_POS_BOTTOM:
1219       add_path_line (cr, x, y + height, x + xy0_gap, y + height);
1220       add_path_line (cr, x + xy1_gap, y + height, x + width, y + height);
1221       break;
1222     case GTK_POS_LEFT:
1223       add_path_line (cr, x, y, x, y + xy0_gap);
1224       add_path_line (cr, x, y + xy1_gap, x, y + height);
1225       break;
1226     case GTK_POS_RIGHT:
1227       add_path_line (cr, x + width, y, x + width, y + xy0_gap);
1228       add_path_line (cr, x + width, y + xy1_gap, x + width, y + height);
1229       break;
1230     }
1231 }
1232
1233 static void
1234 color_shade (const GdkRGBA *color,
1235              gdouble        factor,
1236              GdkRGBA       *color_return)
1237 {
1238   GtkSymbolicColor *literal, *shade;
1239
1240   literal = gtk_symbolic_color_new_literal (color);
1241   shade = gtk_symbolic_color_new_shade (literal, factor);
1242   gtk_symbolic_color_unref (literal);
1243
1244   gtk_symbolic_color_resolve (shade, NULL, color_return);
1245   gtk_symbolic_color_unref (shade);
1246 }
1247
1248 static void
1249 _cairo_round_rectangle_sides (cairo_t          *cr,
1250                               gdouble           radius,
1251                               gdouble           x,
1252                               gdouble           y,
1253                               gdouble           width,
1254                               gdouble           height,
1255                               guint             sides,
1256                               GtkJunctionSides  junction)
1257 {
1258   radius = CLAMP (radius, 0, MIN (width / 2, height / 2));
1259
1260   if (sides & SIDE_RIGHT)
1261     {
1262       if (radius == 0 ||
1263           (junction & GTK_JUNCTION_TOP) ||
1264           (junction & GTK_JUNCTION_RIGHT))
1265         cairo_move_to (cr, x + width, y);
1266       else
1267         {
1268           cairo_new_sub_path (cr);
1269           cairo_arc (cr, x + width - radius, y + radius, radius, - G_PI / 4, 0);
1270         }
1271
1272       if (radius == 0 ||
1273           (junction & GTK_JUNCTION_BOTTOM) ||
1274           (junction & GTK_JUNCTION_RIGHT))
1275         cairo_line_to (cr, x + width, y + height);
1276       else
1277         cairo_arc (cr, x + width - radius, y + height - radius, radius, 0, G_PI / 4);
1278     }
1279
1280   if (sides & SIDE_BOTTOM)
1281     {
1282       if (radius != 0 &&
1283           ! (junction & GTK_JUNCTION_RIGHT) &&
1284           ! (junction & GTK_JUNCTION_BOTTOM))
1285         {
1286           if ((sides & SIDE_RIGHT) == 0)
1287             cairo_new_sub_path (cr);
1288
1289           cairo_arc (cr, x + width - radius, y + height - radius, radius, G_PI / 4, G_PI / 2);
1290         }
1291
1292       if (radius == 0 ||
1293           (junction & GTK_JUNCTION_BOTTOM) ||
1294           (junction & GTK_JUNCTION_LEFT))
1295         cairo_line_to (cr, x, y + height);
1296       else
1297         cairo_arc (cr, x + radius, y + height - radius, radius, G_PI / 2, 3 * (G_PI / 4));
1298     }
1299   else
1300     cairo_move_to (cr, x, y + height);
1301
1302   if (sides & SIDE_LEFT)
1303     {
1304       if (radius != 0 &&
1305           ! (junction & GTK_JUNCTION_LEFT) &&
1306           ! (junction & GTK_JUNCTION_BOTTOM))
1307         {
1308           if ((sides & SIDE_BOTTOM) == 0)
1309             cairo_new_sub_path (cr);
1310
1311           cairo_arc (cr, x + radius, y + height - radius, radius, 3 * (G_PI / 4), G_PI);
1312         }
1313
1314       if (radius == 0 ||
1315           (junction & GTK_JUNCTION_TOP) ||
1316           (junction & GTK_JUNCTION_LEFT))
1317         cairo_line_to (cr, x, y);
1318       else
1319         cairo_arc (cr, x + radius, y + radius, radius, G_PI, G_PI + G_PI / 4);
1320     }
1321
1322   if (sides & SIDE_TOP)
1323     {
1324       if (radius != 0 &&
1325           ! (junction & GTK_JUNCTION_TOP) &&
1326           ! (junction & GTK_JUNCTION_LEFT))
1327         {
1328           if ((sides & SIDE_TOP) == 0)
1329             cairo_new_sub_path (cr);
1330
1331           cairo_arc (cr, x + radius, y + radius, radius, 5 * (G_PI / 4), 3 * (G_PI / 2));
1332         }
1333
1334       if (radius == 0 ||
1335           (junction & GTK_JUNCTION_TOP) ||
1336           (junction & GTK_JUNCTION_RIGHT))
1337         cairo_line_to (cr, x + width, y);
1338       else
1339         cairo_arc (cr, x + width - radius, y + radius, radius, 3 * (G_PI / 2), - G_PI / 4);
1340     }
1341 }
1342
1343 static void
1344 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1345                                       cairo_t          *cr,
1346                                       gdouble           x,
1347                                       gdouble           y,
1348                                       gdouble           width,
1349                                       gdouble           height)
1350 {
1351   GdkRGBA *bg_color;
1352   cairo_pattern_t *pattern;
1353   GtkStateFlags flags;
1354   gboolean running;
1355   gdouble progress, alpha = 1;
1356   GtkJunctionSides junction;
1357   gint radius, border_width;
1358
1359   flags = gtk_theming_engine_get_state (engine);
1360   junction = gtk_theming_engine_get_junction_sides (engine);
1361   cairo_save (cr);
1362
1363   if (gtk_theming_engine_has_class (engine, "spinbutton") &&
1364       gtk_theming_engine_has_class (engine, "button"))
1365     {
1366       x += 2;
1367       y += 2;
1368       width -= 4;
1369       height -= 4;
1370     }
1371
1372   gtk_theming_engine_get (engine, flags,
1373                           "background-image", &pattern,
1374                           "background-color", &bg_color,
1375                           "border-width", &border_width,
1376                           "border-radius", &radius,
1377                           NULL);
1378
1379   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1380
1381   if (border_width > 0)
1382     {
1383       x += border_width;
1384       y += border_width;
1385       width -= 2 * border_width;
1386       height -= 2 * border_width;
1387       radius -= 2 * border_width;
1388
1389       if (radius < 0)
1390         radius = 0;
1391     }
1392
1393   _cairo_round_rectangle_sides (cr, (gdouble) radius,
1394                                 x, y, width, height,
1395                                 SIDE_ALL, junction);
1396   cairo_clip (cr);
1397
1398   if (gtk_theming_engine_has_class (engine, "background"))
1399     {
1400       cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0); /* transparent */
1401       cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
1402       cairo_paint (cr);
1403     }
1404
1405   cairo_translate (cr, x, y);
1406   cairo_scale (cr, width, height);
1407
1408   if (running)
1409     {
1410       cairo_pattern_t *other_pattern;
1411       GtkStateFlags other_flags;
1412       GdkRGBA *other_bg;
1413       cairo_pattern_t *new_pattern = NULL;
1414
1415       if (flags & GTK_STATE_FLAG_PRELIGHT)
1416         {
1417           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
1418           progress = 1 - progress;
1419         }
1420       else
1421         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
1422
1423       gtk_theming_engine_get (engine, other_flags,
1424                               "background-image", &other_pattern,
1425                               "background-color", &other_bg,
1426                               NULL);
1427
1428       if (pattern && other_pattern)
1429         {
1430           cairo_pattern_type_t type, other_type;
1431           gint n0, n1;
1432
1433           cairo_pattern_get_color_stop_count (pattern, &n0);
1434           cairo_pattern_get_color_stop_count (other_pattern, &n1);
1435           type = cairo_pattern_get_type (pattern);
1436           other_type = cairo_pattern_get_type (other_pattern);
1437
1438           if (type == other_type && n0 == n1)
1439             {
1440               gdouble offset0, red0, green0, blue0, alpha0;
1441               gdouble offset1, red1, green1, blue1, alpha1;
1442               gdouble x00, x01, y00, y01, x10, x11, y10, y11;
1443               gdouble r00, r01, r10, r11;
1444               guint i;
1445
1446               if (type == CAIRO_PATTERN_TYPE_LINEAR)
1447                 {
1448                   cairo_pattern_get_linear_points (pattern, &x00, &y00, &x01, &y01);
1449                   cairo_pattern_get_linear_points (other_pattern, &x10, &y10, &x11, &y11);
1450
1451                   new_pattern = cairo_pattern_create_linear (x00 + (x10 - x00) * progress,
1452                                                              y00 + (y10 - y00) * progress,
1453                                                              x01 + (x11 - x01) * progress,
1454                                                              y01 + (y11 - y01) * progress);
1455                 }
1456               else
1457                 {
1458                   cairo_pattern_get_radial_circles (pattern, &x00, &y00, &r00, &x01, &y01, &r01);
1459                   cairo_pattern_get_radial_circles (other_pattern, &x10, &y10, &r10, &x11, &y11, &r11);
1460
1461                   new_pattern = cairo_pattern_create_radial (x00 + (x10 - x00) * progress,
1462                                                              y00 + (y10 - y00) * progress,
1463                                                              r00 + (r10 - r00) * progress,
1464                                                              x01 + (x11 - x01) * progress,
1465                                                              y01 + (y11 - y01) * progress,
1466                                                              r01 + (r11 - r01) * progress);
1467                 }
1468
1469               cairo_pattern_set_filter (new_pattern, CAIRO_FILTER_FAST);
1470               i = 0;
1471
1472               /* Blend both gradients into one */
1473               while (i < n0 && i < n1)
1474                 {
1475                   cairo_pattern_get_color_stop_rgba (pattern, i,
1476                                                      &offset0,
1477                                                      &red0, &green0, &blue0,
1478                                                      &alpha0);
1479                   cairo_pattern_get_color_stop_rgba (other_pattern, i,
1480                                                      &offset1,
1481                                                      &red1, &green1, &blue1,
1482                                                      &alpha1);
1483
1484                   cairo_pattern_add_color_stop_rgba (new_pattern,
1485                                                      offset0 + ((offset1 - offset0) * progress),
1486                                                      red0 + ((red1 - red0) * progress),
1487                                                      green0 + ((green1 - green0) * progress),
1488                                                      blue0 + ((blue1 - blue0) * progress),
1489                                                      alpha0 + ((alpha1 - alpha0) * progress));
1490                   i++;
1491                 }
1492             }
1493           else
1494             {
1495               /* Different pattern types, or different color
1496                * stop counts, alpha blend both patterns.
1497                */
1498               cairo_rectangle (cr, 0, 0, 1, 1);
1499               cairo_set_source (cr, other_pattern);
1500               cairo_fill_preserve (cr);
1501
1502               /* Set alpha for posterior drawing
1503                * of the target pattern
1504                */
1505               alpha = 1 - progress;
1506             }
1507         }
1508       else if (pattern || other_pattern)
1509         {
1510           cairo_pattern_t *p;
1511           const GdkRGBA *c;
1512           gdouble x0, y0, x1, y1, r0, r1;
1513           gint n, i;
1514
1515           /* Blend a pattern with a color */
1516           if (pattern)
1517             {
1518               p = pattern;
1519               c = other_bg;
1520               progress = 1 - progress;
1521             }
1522           else
1523             {
1524               p = other_pattern;
1525               c = bg_color;
1526             }
1527
1528           if (cairo_pattern_get_type (p) == CAIRO_PATTERN_TYPE_LINEAR)
1529             {
1530               cairo_pattern_get_linear_points (p, &x0, &y0, &x1, &y1);
1531               new_pattern = cairo_pattern_create_linear (x0, y0, x1, y1);
1532             }
1533           else
1534             {
1535               cairo_pattern_get_radial_circles (p, &x0, &y0, &r0, &x1, &y1, &r1);
1536               new_pattern = cairo_pattern_create_radial (x0, y0, r0, x1, y1, r1);
1537             }
1538
1539           cairo_pattern_get_color_stop_count (p, &n);
1540
1541           for (i = 0; i < n; i++)
1542             {
1543               gdouble red1, green1, blue1, alpha1;
1544               gdouble offset;
1545
1546               cairo_pattern_get_color_stop_rgba (p, i,
1547                                                  &offset,
1548                                                  &red1, &green1, &blue1,
1549                                                  &alpha1);
1550               cairo_pattern_add_color_stop_rgba (new_pattern, offset,
1551                                                  c->red + ((red1 - c->red) * progress),
1552                                                  c->green + ((green1 - c->green) * progress),
1553                                                  c->blue + ((blue1 - c->blue) * progress),
1554                                                  c->alpha + ((alpha1 - c->alpha) * progress));
1555             }
1556         }
1557       else
1558         {
1559           const GdkRGBA *color, *other_color;
1560
1561           /* Merge just colors */
1562           color = bg_color;
1563           other_color = other_bg;
1564
1565           new_pattern = cairo_pattern_create_rgba (CLAMP (color->red + ((other_color->red - color->red) * progress), 0, 1),
1566                                                    CLAMP (color->green + ((other_color->green - color->green) * progress), 0, 1),
1567                                                    CLAMP (color->blue + ((other_color->blue - color->blue) * progress), 0, 1),
1568                                                    CLAMP (color->alpha + ((other_color->alpha - color->alpha) * progress), 0, 1));
1569         }
1570
1571       if (new_pattern)
1572         {
1573           /* Replace pattern to use */
1574           cairo_pattern_destroy (pattern);
1575           pattern = new_pattern;
1576         }
1577
1578       if (other_pattern)
1579         cairo_pattern_destroy (other_pattern);
1580
1581       if (other_bg)
1582         gdk_rgba_free (other_bg);
1583     }
1584
1585   cairo_rectangle (cr, 0, 0, 1, 1);
1586
1587   if (pattern)
1588     {
1589       cairo_set_source (cr, pattern);
1590       cairo_pattern_destroy (pattern);
1591     }
1592   else
1593     gdk_cairo_set_source_rgba (cr, bg_color);
1594
1595   if (alpha == 1)
1596     cairo_fill (cr);
1597   else
1598     {
1599       cairo_pattern_t *mask;
1600
1601       mask = cairo_pattern_create_rgba (1, 1, 1, alpha);
1602       cairo_mask (cr, mask);
1603       cairo_pattern_destroy (mask);
1604     }
1605
1606   cairo_restore (cr);
1607
1608   gdk_rgba_free (bg_color);
1609 }
1610
1611 static void
1612 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1613                                  cairo_t          *cr,
1614                                  gdouble           x,
1615                                  gdouble           y,
1616                                  gdouble           width,
1617                                  gdouble           height)
1618 {
1619   GtkStateFlags flags;
1620   GdkRGBA lighter;
1621   GdkRGBA *border_color;
1622   Gtk9Slice *slice;
1623   GtkBorderStyle border_style;
1624   gint border_width, radius;
1625   GtkJunctionSides junction;
1626   gdouble d1, d2, m;
1627
1628   flags = gtk_theming_engine_get_state (engine);
1629   junction = gtk_theming_engine_get_junction_sides (engine);
1630
1631   gtk_theming_engine_get (engine, flags,
1632                           "border-image", &slice,
1633                           "border-color", &border_color,
1634                           "border-style", &border_style,
1635                           "border-width", &border_width,
1636                           "border-radius", &radius,
1637                           NULL);
1638
1639   if (slice)
1640     {
1641       gtk_9slice_render (slice, cr, x, y, width, height);
1642       gtk_9slice_unref (slice);
1643     }
1644   else if (border_color &&
1645            border_style != GTK_BORDER_STYLE_NONE)
1646     {
1647       cairo_save (cr);
1648
1649       color_shade (border_color, 1.8, &lighter);
1650
1651       switch (border_style)
1652         {
1653         case GTK_BORDER_STYLE_NONE:
1654           break;
1655         case GTK_BORDER_STYLE_SOLID:
1656           cairo_set_line_width (cr, border_width);
1657           cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1658
1659           if (border_width > 1)
1660             {
1661               x += (gdouble) border_width / 2;
1662               y += (gdouble) border_width / 2;
1663               width -= border_width;
1664               height -= border_width;
1665             }
1666
1667           _cairo_round_rectangle_sides (cr, (gdouble) radius, x, y, width, height,
1668                                         SIDE_ALL, junction);
1669           gdk_cairo_set_source_rgba (cr, border_color);
1670           cairo_stroke (cr);
1671
1672           break;
1673         case GTK_BORDER_STYLE_INSET:
1674         case GTK_BORDER_STYLE_OUTSET:
1675           cairo_set_line_width (cr, border_width);
1676           cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1677
1678           d1 = d2 = 0;
1679
1680           if (border_width > 1)
1681             {
1682               d1 = (gdouble) border_width / 2;
1683               d2 = (gdouble) (border_width - (gint) d1) + 1;
1684             }
1685
1686           cairo_save (cr);
1687
1688           m = MIN (width, height);
1689           m /= 2;
1690
1691           /* Only needed for square frames to have a 3D-like
1692            * feeling, for rounded ones, the arc will ensure
1693            * the stroke is painted to end at 45°.
1694            */
1695           if (radius == 0)
1696             {
1697               cairo_move_to (cr, x, y + height);
1698               cairo_line_to (cr, x + m, y + height - m);
1699               cairo_line_to (cr, x + width - m, y + m);
1700               cairo_line_to (cr, x + width, y);
1701               cairo_line_to (cr, x + width, y + height);
1702               cairo_close_path (cr);
1703
1704               cairo_clip (cr);
1705             }
1706
1707           if (border_style == GTK_BORDER_STYLE_INSET)
1708             gdk_cairo_set_source_rgba (cr, &lighter);
1709           else
1710             gdk_cairo_set_source_rgba (cr, border_color);
1711
1712           _cairo_round_rectangle_sides (cr, (gdouble) radius,
1713                                         x + d1, y + d1,
1714                                         width - d2, height - d2,
1715                                         SIDE_BOTTOM | SIDE_RIGHT, junction);
1716           cairo_stroke (cr);
1717
1718           cairo_restore (cr);
1719
1720           cairo_save (cr);
1721
1722           if (radius == 0)
1723             {
1724               cairo_move_to (cr, x, y + height);
1725               cairo_line_to (cr, x + m, y + height - m);
1726               cairo_line_to (cr, x + width - m, y + m);
1727               cairo_line_to (cr, x + width, y);
1728               cairo_line_to (cr, x, y);
1729               cairo_close_path (cr);
1730
1731               cairo_clip (cr);
1732             }
1733
1734           if (border_style == GTK_BORDER_STYLE_INSET)
1735             gdk_cairo_set_source_rgba (cr, border_color);
1736           else
1737             gdk_cairo_set_source_rgba (cr, &lighter);
1738
1739           _cairo_round_rectangle_sides (cr, (gdouble) radius,
1740                                         x + d1, y + d1,
1741                                         width - d2, height - d2,
1742                                         SIDE_TOP | SIDE_LEFT, junction);
1743           cairo_stroke (cr);
1744
1745           cairo_restore (cr);
1746
1747           break;
1748         }
1749
1750       cairo_restore (cr);
1751     }
1752
1753   if (border_color)
1754     gdk_rgba_free (border_color);
1755 }
1756
1757 static void
1758 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1759                                     cairo_t          *cr,
1760                                     gdouble           x,
1761                                     gdouble           y,
1762                                     gdouble           width,
1763                                     gdouble           height)
1764 {
1765   GtkStateFlags flags;
1766   GdkRGBA *bg_color, *fg_color;
1767   double vertical_overshoot;
1768   int diameter;
1769   double radius;
1770   double interp;                /* interpolation factor for center position */
1771   double x_double_horz, y_double_horz;
1772   double x_double_vert, y_double_vert;
1773   double x_double, y_double;
1774   gdouble angle;
1775   gint line_width;
1776
1777   cairo_save (cr);
1778   flags = gtk_theming_engine_get_state (engine);
1779
1780   gtk_theming_engine_get (engine, flags,
1781                           "color", &fg_color,
1782                           "background-color", &bg_color,
1783                           NULL);
1784
1785   line_width = 1;
1786
1787   /* FIXME: LTR/RTL */
1788   if (flags & GTK_STATE_FLAG_ACTIVE)
1789     {
1790       angle = G_PI / 2;
1791       interp = 1.0;
1792     }
1793   else
1794     {
1795       angle = 0;
1796       interp = 0;
1797     }
1798
1799   /* Compute distance that the stroke extends beyonds the end
1800    * of the triangle we draw.
1801    */
1802   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
1803
1804   /* For odd line widths, we end the vertical line of the triangle
1805    * at a half pixel, so we round differently.
1806    */
1807   if (line_width % 2 == 1)
1808     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
1809   else
1810     vertical_overshoot = ceil (vertical_overshoot);
1811
1812   /* Adjust the size of the triangle we draw so that the entire stroke fits
1813    */
1814   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
1815
1816   /* If the line width is odd, we want the diameter to be even,
1817    * and vice versa, so force the sum to be odd. This relationship
1818    * makes the point of the triangle look right.
1819    */
1820   diameter -= (1 - (diameter + line_width) % 2);
1821
1822   radius = diameter / 2.;
1823
1824   /* Adjust the center so that the stroke is properly aligned with
1825    * the pixel grid. The center adjustment is different for the
1826    * horizontal and vertical orientations. For intermediate positions
1827    * we interpolate between the two.
1828    */
1829   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1830   y_double_vert = (y + height / 2) - 0.5;
1831
1832   x_double_horz = (x + width / 2) - 0.5;
1833   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1834
1835   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
1836   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
1837
1838   cairo_translate (cr, x_double, y_double);
1839   cairo_rotate (cr, angle);
1840
1841   cairo_move_to (cr, - radius / 2., - radius);
1842   cairo_line_to (cr,   radius / 2.,   0);
1843   cairo_line_to (cr, - radius / 2.,   radius);
1844   cairo_close_path (cr);
1845
1846   cairo_set_line_width (cr, line_width);
1847
1848   gdk_cairo_set_source_rgba (cr, fg_color);
1849
1850   cairo_fill_preserve (cr);
1851
1852   gdk_cairo_set_source_rgba (cr, fg_color);
1853   cairo_stroke (cr);
1854
1855   cairo_restore (cr);
1856
1857   gdk_rgba_free (fg_color);
1858   gdk_rgba_free (bg_color);
1859 }
1860
1861 static void
1862 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
1863                                  cairo_t          *cr,
1864                                  gdouble           x,
1865                                  gdouble           y,
1866                                  gdouble           width,
1867                                  gdouble           height)
1868 {
1869   GtkStateFlags flags;
1870   GdkRGBA *color;
1871   gint line_width;
1872   gint8 *dash_list;
1873
1874   cairo_save (cr);
1875   flags = gtk_theming_engine_get_state (engine);
1876
1877   gtk_theming_engine_get (engine, flags,
1878                           "color", &color,
1879                           NULL);
1880
1881   gtk_theming_engine_get_style (engine,
1882                                 "focus-line-width", &line_width,
1883                                 "focus-line-pattern", (gchar *) &dash_list,
1884                                 NULL);
1885
1886   cairo_set_line_width (cr, (gdouble) line_width);
1887
1888   if (dash_list[0])
1889     {
1890       gint n_dashes = strlen ((const gchar *) dash_list);
1891       gdouble *dashes = g_new (gdouble, n_dashes);
1892       gdouble total_length = 0;
1893       gdouble dash_offset;
1894       gint i;
1895
1896       for (i = 0; i < n_dashes; i++)
1897         {
1898           dashes[i] = dash_list[i];
1899           total_length += dash_list[i];
1900         }
1901
1902       /* The dash offset here aligns the pattern to integer pixels
1903        * by starting the dash at the right side of the left border
1904        * Negative dash offsets in cairo don't work
1905        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
1906        */
1907       dash_offset = - line_width / 2.;
1908
1909       while (dash_offset < 0)
1910         dash_offset += total_length;
1911
1912       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
1913       g_free (dashes);
1914     }
1915
1916   cairo_rectangle (cr,
1917                    x + line_width / 2.,
1918                    y + line_width / 2.,
1919                    width - line_width,
1920                    height - line_width);
1921
1922   gdk_cairo_set_source_rgba (cr, color);
1923   cairo_stroke (cr);
1924
1925   cairo_restore (cr);
1926
1927   gdk_rgba_free (color);
1928   g_free (dash_list);
1929 }
1930
1931 static void
1932 gtk_theming_engine_render_line (GtkThemingEngine *engine,
1933                                 cairo_t          *cr,
1934                                 gdouble           x0,
1935                                 gdouble           y0,
1936                                 gdouble           x1,
1937                                 gdouble           y1)
1938 {
1939   GdkRGBA *bg_color, darker, lighter;
1940   GtkStateFlags flags;
1941   gint i, thickness, thickness_dark, thickness_light, len;
1942   cairo_matrix_t matrix;
1943   gdouble angle;
1944
1945   /* FIXME: thickness */
1946   thickness = 2;
1947   thickness_dark = thickness / 2;
1948   thickness_light = thickness - thickness_dark;
1949
1950   flags = gtk_theming_engine_get_state (engine);
1951   cairo_save (cr);
1952
1953   gtk_theming_engine_get (engine, flags,
1954                           "background-color", &bg_color,
1955                           NULL);
1956   color_shade (bg_color, 0.7, &darker);
1957   color_shade (bg_color, 1.3, &lighter);
1958
1959   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1960   cairo_set_line_width (cr, 1);
1961
1962   angle = atan2 (x1 - x0, y1 - y0);
1963   angle = (2 * G_PI) - angle;
1964   angle += G_PI / 2;
1965
1966   cairo_get_matrix (cr, &matrix);
1967   cairo_matrix_translate (&matrix, x0, y0);
1968   cairo_matrix_rotate (&matrix, angle);
1969   cairo_set_matrix (cr, &matrix);
1970
1971   x1 -= x0;
1972   y1 -= y0;
1973
1974   len = (gint) sqrt ((x1 * x1) + (y1 * y1));
1975
1976   y0 = -thickness_dark;
1977
1978   for (i = 0; i < thickness_dark; i++)
1979     {
1980       gdk_cairo_set_source_rgba (cr, &lighter);
1981       add_path_line (cr, len - i - 1.5, y0, len - 0.5, y0);
1982       cairo_stroke (cr);
1983
1984       gdk_cairo_set_source_rgba (cr, &darker);
1985       add_path_line (cr, 0.5, y0, len - i - 1.5, y0);
1986       cairo_stroke (cr);
1987
1988       y0++;
1989     }
1990
1991   for (i = 0; i < thickness_light; i++)
1992     {
1993       gdk_cairo_set_source_rgba (cr, &darker);
1994       add_path_line (cr, 0.5, y0, thickness_light - i + 0.5, y0);
1995       cairo_stroke (cr);
1996
1997       gdk_cairo_set_source_rgba (cr, &lighter);
1998       add_path_line (cr, thickness_light - i + 0.5, y0, len - 0.5, y0);
1999       cairo_stroke (cr);
2000
2001       y0++;
2002     }
2003
2004   cairo_restore (cr);
2005
2006   gdk_rgba_free (bg_color);
2007 }
2008
2009 static void
2010 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2011                                   cairo_t          *cr,
2012                                   gdouble           x,
2013                                   gdouble           y,
2014                                   PangoLayout      *layout)
2015 {
2016   const PangoMatrix *matrix;
2017   GdkRGBA *fg_color;
2018   GtkStateFlags flags;
2019   GdkScreen *screen;
2020
2021   cairo_save (cr);
2022   flags = gtk_theming_engine_get_state (engine);
2023
2024   gtk_theming_engine_get (engine, flags,
2025                           "color", &fg_color,
2026                           NULL);
2027
2028   screen = gtk_theming_engine_get_screen (engine);
2029   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2030
2031   if (matrix)
2032     {
2033       cairo_matrix_t cairo_matrix;
2034       PangoMatrix tmp_matrix;
2035       PangoRectangle rect;
2036
2037       cairo_matrix_init (&cairo_matrix,
2038                          matrix->xx, matrix->yx,
2039                          matrix->xy, matrix->yy,
2040                          matrix->x0, matrix->y0);
2041
2042       pango_layout_get_extents (layout, NULL, &rect);
2043       pango_matrix_transform_rectangle (matrix, &rect);
2044       pango_extents_to_pixels (&rect, NULL);
2045
2046       tmp_matrix = *matrix;
2047       cairo_matrix.x0 += x - rect.x;
2048       cairo_matrix.y0 += y - rect.y;
2049
2050       cairo_set_matrix (cr, &cairo_matrix);
2051     }
2052   else
2053     cairo_translate (cr, x, y);
2054
2055   if (flags & GTK_STATE_FLAG_INSENSITIVE)
2056     {
2057       cairo_save (cr);
2058       cairo_set_source_rgb (cr, 1, 1, 1);
2059       cairo_move_to (cr, 1, 1);
2060       _gtk_pango_fill_layout (cr, layout);
2061       cairo_restore (cr);
2062     }
2063
2064   gdk_cairo_set_source_rgba (cr, fg_color);
2065   pango_cairo_show_layout (cr, layout);
2066
2067   cairo_restore (cr);
2068
2069   gdk_rgba_free (fg_color);
2070 }
2071
2072 static void
2073 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2074                                   cairo_t          *cr,
2075                                   gdouble           x,
2076                                   gdouble           y,
2077                                   gdouble           width,
2078                                   gdouble           height,
2079                                   GtkOrientation    orientation)
2080 {
2081   const GtkWidgetPath *path;
2082   gint thickness;
2083
2084   path = gtk_theming_engine_get_path (engine);
2085
2086   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2087   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2088
2089   /* FIXME: thickness */
2090   thickness = 2;
2091
2092   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
2093     {
2094       if (orientation == GTK_ORIENTATION_VERTICAL)
2095         gtk_theming_engine_render_line (engine, cr,
2096                                         x + thickness,
2097                                         y + (gint) height / 2,
2098                                         x + width - thickness - 1,
2099                                         y + (gint) height / 2);
2100       else
2101         gtk_theming_engine_render_line (engine, cr,
2102                                         x + (gint) width / 2,
2103                                         y + thickness,
2104                                         x + (gint) width / 2,
2105                                         y + height - thickness - 1);
2106     }
2107 }
2108
2109 static void
2110 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2111                                      cairo_t          *cr,
2112                                      gdouble           x,
2113                                      gdouble           y,
2114                                      gdouble           width,
2115                                      gdouble           height,
2116                                      GtkPositionType   gap_side,
2117                                      gdouble           xy0_gap,
2118                                      gdouble           xy1_gap)
2119 {
2120   GtkStateFlags flags;
2121   GdkRGBA *bg_color;
2122   GdkRGBA lighter, darker;
2123   guint sides;
2124
2125   cairo_save (cr);
2126   flags = gtk_theming_engine_get_state (engine);
2127
2128   cairo_set_line_width (cr, 1);
2129
2130   gtk_theming_engine_get (engine, flags,
2131                           "background-color", &bg_color,
2132                           NULL);
2133   color_shade (bg_color, 0.7, &darker);
2134   color_shade (bg_color, 1.3, &lighter);
2135
2136   if (gtk_theming_engine_has_class (engine, "frame"))
2137     {
2138       if (gap_side == GTK_POS_RIGHT)
2139         sides = SIDE_BOTTOM;
2140       else if (gap_side == GTK_POS_BOTTOM)
2141         sides = SIDE_RIGHT;
2142       else
2143         sides = SIDE_BOTTOM | SIDE_RIGHT;
2144
2145       gdk_cairo_set_source_rgba (cr, &lighter);
2146       add_path_rectangle_sides (cr, x , y, width , height, sides);
2147       cairo_stroke (cr);
2148
2149       gdk_cairo_set_source_rgba (cr, &darker);
2150       add_path_rectangle_sides (cr, x, y, width - 1, height - 1, sides);
2151       cairo_stroke (cr);
2152
2153       if (gap_side == GTK_POS_RIGHT ||
2154           gap_side == GTK_POS_BOTTOM)
2155         {
2156           gdk_cairo_set_source_rgba (cr, &darker);
2157           add_path_gap_side (cr, gap_side,
2158                              x + 1, y + 1, width - 4, height - 4,
2159                              xy0_gap, xy1_gap);
2160           cairo_stroke (cr);
2161
2162           gdk_cairo_set_source_rgba (cr, &lighter);
2163           add_path_gap_side (cr, gap_side,
2164                              x, y, width, height,
2165                              xy0_gap, xy1_gap);
2166           cairo_stroke (cr);
2167         }
2168
2169       if (gap_side == GTK_POS_LEFT)
2170         sides = SIDE_TOP;
2171       else if (gap_side == GTK_POS_TOP)
2172         sides = SIDE_LEFT;
2173       else
2174         sides = SIDE_TOP | SIDE_LEFT;
2175
2176       gdk_cairo_set_source_rgba (cr, &lighter);
2177       add_path_rectangle_sides (cr, x + 1, y + 1, width - 2, height - 3, sides);
2178       cairo_stroke (cr);
2179
2180       gdk_cairo_set_source_rgba (cr, &darker);
2181       add_path_rectangle_sides (cr, x, y, width - 1, height - 1, sides);
2182       cairo_stroke (cr);
2183
2184       if (gap_side == GTK_POS_LEFT ||
2185           gap_side == GTK_POS_TOP)
2186         {
2187           gdk_cairo_set_source_rgba (cr, &lighter);
2188           add_path_gap_side (cr, gap_side,
2189                              x + 1, y + 1, width - 4, height - 4,
2190                              xy0_gap, xy1_gap);
2191           cairo_stroke (cr);
2192
2193           gdk_cairo_set_source_rgba (cr, &darker);
2194           add_path_gap_side (cr, gap_side,
2195                              x, y, width - 2, height - 2,
2196                              xy0_gap, xy1_gap);
2197           cairo_stroke (cr);
2198         }
2199     }
2200   else
2201     {
2202       if (gap_side == GTK_POS_RIGHT)
2203         sides = SIDE_BOTTOM;
2204       else if (gap_side == GTK_POS_BOTTOM)
2205         sides = SIDE_RIGHT;
2206       else
2207         sides = SIDE_BOTTOM | SIDE_RIGHT;
2208
2209       gdk_cairo_set_source_rgba (cr, &darker);
2210       add_path_rectangle_sides (cr, x + 1, y, width - 2, height, sides);
2211       add_path_rectangle_sides (cr, x, y + 1, width, height - 2, sides);
2212       cairo_stroke (cr);
2213
2214       cairo_set_source_rgb (cr, 0, 0, 0);
2215       add_path_rectangle_sides (cr, x, y, width, height, sides);
2216       cairo_stroke (cr);
2217
2218       if (gap_side == GTK_POS_RIGHT ||
2219           gap_side == GTK_POS_BOTTOM)
2220         {
2221           gdk_cairo_set_source_rgba (cr, &darker);
2222           add_path_gap_side (cr, gap_side,
2223                              x, y, width - 2, height - 2,
2224                              xy0_gap, xy1_gap);
2225           cairo_stroke (cr);
2226
2227           cairo_set_source_rgb (cr, 0, 0, 0);
2228           add_path_gap_side (cr, gap_side,
2229                              x, y, width - 1, height - 1,
2230                              xy0_gap, xy1_gap);
2231           cairo_stroke (cr);
2232         }
2233
2234       if (gap_side == GTK_POS_LEFT)
2235         sides = SIDE_TOP;
2236       else if (gap_side == GTK_POS_TOP)
2237         sides = SIDE_LEFT;
2238       else
2239         sides = SIDE_TOP | SIDE_LEFT;
2240
2241       gdk_cairo_set_source_rgba (cr, &lighter);
2242       add_path_rectangle_sides (cr, x, y, width, height, sides);
2243       cairo_stroke (cr);
2244
2245       if (gap_side == GTK_POS_LEFT ||
2246           gap_side == GTK_POS_TOP)
2247         {
2248           add_path_gap_side (cr, gap_side,
2249                              x, y, width, height,
2250                              xy0_gap, xy1_gap);
2251           cairo_stroke (cr);
2252         }
2253     }
2254
2255   cairo_restore (cr);
2256
2257   gdk_rgba_free (bg_color);
2258 }
2259
2260 static void
2261 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2262                                      cairo_t          *cr,
2263                                      gdouble           x,
2264                                      gdouble           y,
2265                                      gdouble           width,
2266                                      gdouble           height,
2267                                      GtkPositionType   gap_side)
2268 {
2269   GtkStateFlags flags;
2270   GdkRGBA *bg_color;
2271   GdkRGBA lighter, darker;
2272
2273   cairo_save (cr);
2274   flags = gtk_theming_engine_get_state (engine);
2275
2276   cairo_set_line_width (cr, 1);
2277
2278   gtk_theming_engine_get (engine, flags,
2279                           "background-color", &bg_color,
2280                           NULL);
2281   color_shade (bg_color, 0.7, &darker);
2282   color_shade (bg_color, 1.3, &lighter);
2283
2284   switch (gap_side)
2285     {
2286     case GTK_POS_TOP:
2287       gdk_cairo_set_source_rgba (cr, bg_color);
2288       cairo_rectangle (cr, x + 1, y, width - 2, height);
2289       cairo_fill (cr);
2290
2291       gdk_cairo_set_source_rgba (cr, &lighter);
2292       add_path_line (cr, x, y, x, y + height - 2);
2293       cairo_stroke (cr);
2294
2295       gdk_cairo_set_source_rgba (cr, bg_color);
2296       add_path_line (cr, x + 1, y, x + 1, y + height - 2);
2297       cairo_stroke (cr);
2298
2299       gdk_cairo_set_source_rgba (cr, &darker);
2300       add_path_line (cr, x + 2, y + height - 2, x + width - 2, y + height - 2);
2301       add_path_line (cr, x + width - 2, y, x + width - 2, y + height - 2);
2302       cairo_stroke (cr);
2303
2304       cairo_set_source_rgb (cr, 0, 0, 0);
2305       add_path_line (cr, x + 1, y + height - 1, x + width - 2, y + height - 1);
2306       add_path_line (cr, x + width - 1, y, x + width - 1, y + height - 2);
2307       cairo_stroke (cr);
2308
2309       break;
2310     case GTK_POS_BOTTOM:
2311       gdk_cairo_set_source_rgba(cr, bg_color);
2312       cairo_rectangle (cr, x + 1, y, width - 2, height);
2313       cairo_fill (cr);
2314
2315       gdk_cairo_set_source_rgba (cr, &lighter);
2316       add_path_line (cr, x + 1, y, x + width - 2, y);
2317       add_path_line (cr, x, y + 1, x, y + height - 1);
2318       cairo_stroke (cr);
2319
2320       gdk_cairo_set_source_rgba (cr, bg_color);
2321       add_path_line (cr, x + 1, y + 1, x + width - 2, y + 1);
2322       add_path_line (cr, x + 1, y + 1, x + 1, y + height - 1);
2323       cairo_stroke (cr);
2324
2325       gdk_cairo_set_source_rgba (cr, &darker);
2326       add_path_line (cr, x + width - 2, y + 2, x + width - 2, y + height - 1);
2327       cairo_stroke (cr);
2328
2329       cairo_set_source_rgb (cr, 0, 0, 0);
2330       add_path_line (cr, x + width - 1, y + 1, x + width - 1, y + height - 1);
2331       cairo_stroke (cr);
2332
2333       break;
2334     case GTK_POS_LEFT:
2335       gdk_cairo_set_source_rgba (cr, bg_color);
2336       cairo_rectangle (cr, x, y + 1, width, height - 2);
2337       cairo_fill (cr);
2338
2339       gdk_cairo_set_source_rgba (cr, &lighter);
2340       add_path_line (cr, x, y, x + width - 2, y);
2341       cairo_stroke (cr);
2342
2343       gdk_cairo_set_source_rgba (cr, bg_color);
2344       add_path_line (cr, x + 1, y + 1, x + width - 2, y + 1);
2345       cairo_stroke (cr);
2346
2347       gdk_cairo_set_source_rgba (cr, &darker);
2348       add_path_line (cr, x, y + height - 2, x + width - 2, y + height - 2);
2349       add_path_line (cr, x + width - 2, y + 2, x + width - 2, y + height - 2);
2350       cairo_stroke (cr);
2351
2352       cairo_set_source_rgb (cr, 0, 0, 0);
2353       add_path_line (cr, x, y + height - 1, x + width - 2, y + height - 1);
2354       add_path_line (cr, x + width - 1, y + 1, x + width - 1, y + height - 2);
2355       cairo_stroke (cr);
2356
2357       break;
2358     case GTK_POS_RIGHT:
2359       gdk_cairo_set_source_rgba (cr, bg_color);
2360       cairo_rectangle (cr, x, y + 1, width, height - 2);
2361       cairo_fill (cr);
2362
2363       gdk_cairo_set_source_rgba (cr, &lighter);
2364       add_path_line (cr, x + 1, y, x + width - 1, y);
2365       add_path_line (cr, x, y + 1, x, y + height - 2);
2366       cairo_stroke (cr);
2367
2368       gdk_cairo_set_source_rgba (cr, bg_color);
2369       add_path_line (cr, x + 1, y + 1, x + width - 1, y + 1);
2370       add_path_line (cr, x + 1, y + 1, x + 1, y + height - 2);
2371       cairo_stroke (cr);
2372
2373       gdk_cairo_set_source_rgba (cr, &darker);
2374       add_path_line (cr, x + 2, y + height - 2, x + width - 1, y + height - 2);
2375       cairo_stroke (cr);
2376
2377       cairo_set_source_rgb (cr, 0, 0, 0);
2378       add_path_line (cr, x + 1, y + height - 1, x + width - 1, y + height - 1);
2379       cairo_stroke (cr);
2380
2381       break;
2382     }
2383
2384   cairo_restore (cr);
2385
2386   gdk_rgba_free (bg_color);
2387 }
2388
2389 static void
2390 render_dot (cairo_t       *cr,
2391             const GdkRGBA *lighter,
2392             const GdkRGBA *darker,
2393             gdouble        x,
2394             gdouble        y,
2395             gdouble        size)
2396 {
2397   size = CLAMP ((gint) size, 2, 3);
2398
2399   if (size == 2)
2400     {
2401       gdk_cairo_set_source_rgba (cr, lighter);
2402       cairo_rectangle (cr, x, y, 1, 1);
2403       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2404       cairo_fill (cr);
2405     }
2406   else if (size == 3)
2407     {
2408       gdk_cairo_set_source_rgba (cr, lighter);
2409       cairo_rectangle (cr, x, y, 2, 1);
2410       cairo_rectangle (cr, x, y, 1, 2);
2411       cairo_fill (cr);
2412
2413       gdk_cairo_set_source_rgba (cr, darker);
2414       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2415       cairo_rectangle (cr, x + 2, y, 1, 2);
2416       cairo_fill (cr);
2417     }
2418 }
2419
2420 static void
2421 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2422                                   cairo_t          *cr,
2423                                   gdouble           x,
2424                                   gdouble           y,
2425                                   gdouble           width,
2426                                   gdouble           height)
2427 {
2428   GtkStateFlags flags;
2429   GdkRGBA *bg_color;
2430   GdkRGBA lighter, darker;
2431   gint xx, yy;
2432
2433   cairo_save (cr);
2434   flags = gtk_theming_engine_get_state (engine);
2435
2436   cairo_set_line_width (cr, 1);
2437
2438   gtk_theming_engine_get (engine, flags,
2439                           "background-color", &bg_color,
2440                           NULL);
2441   color_shade (bg_color, 0.7, &darker);
2442   color_shade (bg_color, 1.3, &lighter);
2443
2444   gdk_cairo_set_source_rgba (cr, bg_color);
2445   cairo_rectangle (cr, x, y, width, height);
2446   cairo_fill (cr);
2447
2448   if (gtk_theming_engine_has_class (engine, "grip"))
2449     {
2450       GtkJunctionSides sides;
2451       gint skip = -1;
2452
2453       cairo_save (cr);
2454
2455       cairo_set_line_width (cr, 1.0);
2456       sides = gtk_theming_engine_get_junction_sides (engine);
2457
2458       /* reduce confusing values to a meaningful state */
2459       if (sides & (GTK_JUNCTION_LEFT | GTK_JUNCTION_RIGHT))
2460         sides &= ~(GTK_JUNCTION_LEFT);
2461
2462       if (sides & (GTK_JUNCTION_TOP | GTK_JUNCTION_BOTTOM))
2463         sides &= ~(GTK_JUNCTION_TOP);
2464
2465       if (sides == 0)
2466         sides = (GTK_JUNCTION_BOTTOM | GTK_JUNCTION_RIGHT);
2467
2468       /* align drawing area to the connected side */
2469       if (sides == GTK_JUNCTION_LEFT)
2470         {
2471           if (height < width)
2472             width = height;
2473         }
2474       else if (sides & (GTK_JUNCTION_LEFT | GTK_JUNCTION_TOP))
2475         {
2476           if (width < height)
2477             height = width;
2478           else if (height < width)
2479             width = height;
2480
2481           skip = 2;
2482         }
2483       else if (sides & (GTK_JUNCTION_LEFT | GTK_JUNCTION_BOTTOM))
2484         {
2485           /* make it square, aligning to bottom left */
2486           if (width < height)
2487             {
2488               y += (height - width);
2489               height = width;
2490             }
2491           else if (height < width)
2492             width = height;
2493
2494           skip = 1;
2495         }
2496       if (sides == GTK_JUNCTION_RIGHT)
2497         {
2498           /* aligning to right */
2499           if (height < width)
2500             {
2501               x += (width - height);
2502               width = height;
2503             }
2504         }
2505       else if (sides & (GTK_JUNCTION_RIGHT | GTK_JUNCTION_TOP))
2506         {
2507           if (width < height)
2508             height = width;
2509           else if (height < width)
2510             {
2511               x += (width - height);
2512               width = height;
2513             }
2514
2515           skip = 3;
2516         }
2517       else if (sides & (GTK_JUNCTION_RIGHT | GTK_JUNCTION_BOTTOM))
2518         {
2519           /* make it square, aligning to bottom right */
2520           if (width < height)
2521             {
2522               y += (height - width);
2523               height = width;
2524             }
2525           else if (height < width)
2526             {
2527               x += (width - height);
2528               width = height;
2529             }
2530
2531           skip = 0;
2532         }
2533       else if (sides == GTK_JUNCTION_TOP)
2534         {
2535           if (width < height)
2536             height = width;
2537         }
2538       else if (sides == GTK_JUNCTION_BOTTOM)
2539         {
2540           /* align to bottom */
2541           if (width < height)
2542             {
2543               y += (height - width);
2544               height = width;
2545             }
2546         }
2547       else
2548         g_assert_not_reached ();
2549
2550       if (sides == GTK_JUNCTION_LEFT ||
2551           sides == GTK_JUNCTION_RIGHT)
2552         {
2553           gint xi;
2554
2555           xi = x;
2556
2557           while (xi < x + width)
2558             {
2559               gdk_cairo_set_source_rgba (cr, &lighter);
2560               add_path_line (cr, x, y, x, y + height);
2561               cairo_stroke (cr);
2562               xi++;
2563
2564               gdk_cairo_set_source_rgba (cr, &darker);
2565               add_path_line (cr, xi, y, xi, y + height);
2566               cairo_stroke (cr);
2567               xi += 2;
2568             }
2569         }
2570       else if (sides == GTK_JUNCTION_TOP ||
2571                sides == GTK_JUNCTION_BOTTOM)
2572         {
2573           gint yi;
2574
2575           yi = y;
2576
2577           while (yi < y + height)
2578             {
2579               gdk_cairo_set_source_rgba (cr, &lighter);
2580               add_path_line (cr, x, yi, x + width, yi);
2581               cairo_stroke (cr);
2582               yi++;
2583
2584               gdk_cairo_set_source_rgba (cr, &darker);
2585               add_path_line (cr, x, yi, x + width, yi);
2586               cairo_stroke (cr);
2587               yi+= 2;
2588             }
2589         }
2590       else if (sides == (GTK_JUNCTION_TOP | GTK_JUNCTION_LEFT))
2591         {
2592           gint xi, yi;
2593
2594           xi = x + width;
2595           yi = y + height;
2596
2597           while (xi > x + 3)
2598             {
2599               gdk_cairo_set_source_rgba (cr, &darker);
2600               add_path_line (cr, xi, y, x, yi);
2601               cairo_stroke (cr);
2602
2603               --xi;
2604               --yi;
2605
2606               add_path_line (cr, xi, y, x, yi);
2607               cairo_stroke (cr);
2608
2609               --xi;
2610               --yi;
2611
2612               gdk_cairo_set_source_rgba (cr, &lighter);
2613               add_path_line (cr, xi, y, x, yi);
2614               cairo_stroke (cr);
2615
2616               xi -= 3;
2617               yi -= 3;
2618             }
2619         }
2620       else if (sides == (GTK_JUNCTION_TOP | GTK_JUNCTION_RIGHT))
2621         {
2622           gint xi, yi;
2623
2624           xi = x;
2625           yi = y + height;
2626
2627           while (xi < (x + width - 3))
2628             {
2629               gdk_cairo_set_source_rgba (cr, &lighter);
2630               add_path_line (cr, xi, y, x + width, yi);
2631               cairo_stroke (cr);
2632
2633               ++xi;
2634               --yi;
2635
2636               gdk_cairo_set_source_rgba (cr, &darker);
2637               add_path_line (cr, xi, y, x + width, yi);
2638               cairo_stroke (cr);
2639
2640               ++xi;
2641               --yi;
2642
2643               add_path_line (cr, xi, y, x + width, yi);
2644               cairo_stroke (cr);
2645
2646               xi += 3;
2647               yi -= 3;
2648             }
2649         }
2650       else if (sides == (GTK_JUNCTION_BOTTOM | GTK_JUNCTION_LEFT))
2651         {
2652           gint xi, yi;
2653
2654           xi = x + width;
2655           yi = y;
2656
2657           while (xi > x + 3)
2658             {
2659               gdk_cairo_set_source_rgba (cr, &darker);
2660               add_path_line (cr, x, yi, xi, y + height);
2661               cairo_stroke (cr);
2662
2663               --xi;
2664               ++yi;
2665
2666               add_path_line (cr, x, yi, xi, y + height);
2667               cairo_stroke (cr);
2668
2669               --xi;
2670               ++yi;
2671
2672               gdk_cairo_set_source_rgba (cr, &lighter);
2673               add_path_line (cr, x, yi, xi, y + height);
2674               cairo_stroke (cr);
2675
2676               xi -= 3;
2677               yi += 3;
2678             }
2679         }
2680       else if (sides == (GTK_JUNCTION_BOTTOM | GTK_JUNCTION_RIGHT))
2681         {
2682           gint xi, yi;
2683
2684           xi = x;
2685           yi = y;
2686
2687           while (xi < (x + width - 3))
2688             {
2689               gdk_cairo_set_source_rgba (cr, &lighter);
2690               add_path_line (cr, xi, y + height, x + width, yi);
2691               cairo_stroke (cr);
2692
2693               ++xi;
2694               ++yi;
2695
2696               gdk_cairo_set_source_rgba (cr, &darker);
2697               add_path_line (cr, xi, y + height, x + width, yi);
2698               cairo_stroke (cr);
2699
2700               ++xi;
2701               ++yi;
2702
2703               add_path_line (cr, xi, y + height, x + width, yi);
2704               cairo_stroke (cr);
2705
2706               xi += 3;
2707               yi += 3;
2708             }
2709         }
2710
2711       cairo_restore (cr);
2712     }
2713   else if (gtk_theming_engine_has_class (engine, "paned"))
2714     {
2715       if (width > height)
2716         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2717           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2718       else
2719         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2720           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2721     }
2722   else
2723     {
2724       for (yy = y; yy < y + height; yy += 3)
2725         for (xx = x; xx < x + width; xx += 6)
2726           {
2727             render_dot (cr, &lighter, &darker, xx, yy, 2);
2728             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2729           }
2730     }
2731
2732   cairo_restore (cr);
2733
2734   gdk_rgba_free (bg_color);
2735 }
2736
2737 static void
2738 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2739                                     cairo_t          *cr,
2740                                     gdouble           x,
2741                                     gdouble           y,
2742                                     gdouble           width,
2743                                     gdouble           height)
2744 {
2745   if (gtk_theming_engine_has_class (engine, "spinner"))
2746     {
2747       GtkStateFlags state;
2748       guint num_steps, step;
2749       GdkRGBA *color;
2750       gdouble dx, dy;
2751       gdouble progress;
2752       gdouble radius;
2753       gdouble half;
2754       gint i;
2755
2756       gtk_theming_engine_get_style (engine,
2757                                     "num-steps", &num_steps,
2758                                     NULL);
2759
2760       state = gtk_theming_engine_get_state (engine);
2761       gtk_theming_engine_get (engine, state,
2762                               "color", &color,
2763                               NULL);
2764       if (num_steps == 0)
2765         num_steps = 12;
2766
2767       if (gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
2768         step = (guint) (progress * num_steps);
2769       else
2770         step = 0;
2771
2772       cairo_save (cr);
2773
2774       cairo_translate (cr, x, y);
2775
2776       /* draw clip region */
2777       cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2778
2779       dx = width / 2;
2780       dy = height / 2;
2781       radius = MIN (width / 2, height / 2);
2782       half = num_steps / 2;
2783
2784       for (i = 0; i < num_steps; i++)
2785         {
2786           gint inset = 0.7 * radius;
2787
2788           /* transparency is a function of time and intial value */
2789           gdouble t = (gdouble) ((i + num_steps - step)
2790                                  % num_steps) / num_steps;
2791
2792           cairo_save (cr);
2793
2794           cairo_set_source_rgba (cr,
2795                                  color->red,
2796                                  color->green,
2797                                  color->blue,
2798                                  color->alpha * t);
2799
2800           cairo_set_line_width (cr, 2.0);
2801           cairo_move_to (cr,
2802                          dx + (radius - inset) * cos (i * G_PI / half),
2803                          dy + (radius - inset) * sin (i * G_PI / half));
2804           cairo_line_to (cr,
2805                          dx + radius * cos (i * G_PI / half),
2806                          dy + radius * sin (i * G_PI / half));
2807           cairo_stroke (cr);
2808
2809           cairo_restore (cr);
2810         }
2811
2812       cairo_restore (cr);
2813
2814       gdk_rgba_free (color);
2815     }
2816   else
2817     {
2818       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2819       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2820     }
2821 }
2822
2823 static GdkPixbuf *
2824 scale_or_ref (GdkPixbuf *src,
2825               gint       width,
2826               gint       height)
2827 {
2828   if (width == gdk_pixbuf_get_width (src) &&
2829       height == gdk_pixbuf_get_height (src))
2830     return g_object_ref (src);
2831   else
2832     return gdk_pixbuf_scale_simple (src,
2833                                     width, height,
2834                                     GDK_INTERP_BILINEAR);
2835 }
2836
2837 static gboolean
2838 lookup_icon_size (GtkThemingEngine *engine,
2839                   GtkIconSize       size,
2840                   gint             *width,
2841                   gint             *height)
2842 {
2843   GdkScreen *screen;
2844   GtkSettings *settings;
2845
2846   screen = gtk_theming_engine_get_screen (engine);
2847   settings = gtk_settings_get_for_screen (screen);
2848
2849   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
2850 }
2851
2852 static GdkPixbuf *
2853 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
2854                                        const GtkIconSource *source,
2855                                        GtkIconSize          size)
2856 {
2857   GdkPixbuf *scaled;
2858   GdkPixbuf *stated;
2859   GdkPixbuf *base_pixbuf;
2860   GtkStateFlags state;
2861   gint width = 1;
2862   gint height = 1;
2863
2864   base_pixbuf = gtk_icon_source_get_pixbuf (source);
2865   state = gtk_theming_engine_get_state (engine);
2866
2867   g_return_val_if_fail (base_pixbuf != NULL, NULL);
2868
2869   if (size != (GtkIconSize) -1 &&
2870       !lookup_icon_size (engine, size, &width, &height))
2871     {
2872       g_warning (G_STRLOC ": invalid icon size '%d'", size);
2873       return NULL;
2874     }
2875
2876   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
2877    * leave it alone.
2878    */
2879   if (size != (GtkIconSize) -1 &&
2880       gtk_icon_source_get_size_wildcarded (source))
2881     scaled = scale_or_ref (base_pixbuf, width, height);
2882   else
2883     scaled = g_object_ref (base_pixbuf);
2884
2885   /* If the state was wildcarded, then generate a state. */
2886   if (gtk_icon_source_get_state_wildcarded (source))
2887     {
2888       if (state & GTK_STATE_FLAG_INSENSITIVE)
2889         {
2890           stated = gdk_pixbuf_copy (scaled);
2891           gdk_pixbuf_saturate_and_pixelate (scaled, stated,
2892                                             0.8, TRUE);
2893           g_object_unref (scaled);
2894         }
2895       else if (state & GTK_STATE_FLAG_PRELIGHT)
2896         {
2897           stated = gdk_pixbuf_copy (scaled);
2898           gdk_pixbuf_saturate_and_pixelate (scaled, stated,
2899                                             1.2, FALSE);
2900           g_object_unref (scaled);
2901         }
2902       else
2903         stated = scaled;
2904     }
2905   else
2906     stated = scaled;
2907
2908   return stated;
2909 }