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   color_return->red = CLAMP (color->red * factor, 0, 1);
1239   color_return->green = CLAMP (color->green * factor, 0, 1);
1240   color_return->blue = CLAMP (color->blue * factor, 0, 1);
1241   color_return->alpha = color->alpha;
1242 }
1243
1244 static void
1245 _cairo_round_rectangle_sides (cairo_t          *cr,
1246                               gdouble           radius,
1247                               gdouble           x,
1248                               gdouble           y,
1249                               gdouble           width,
1250                               gdouble           height,
1251                               guint             sides,
1252                               GtkJunctionSides  junction)
1253 {
1254   radius = CLAMP (radius, 0, MIN (width / 2, height / 2));
1255
1256   if (sides & SIDE_RIGHT)
1257     {
1258       if (radius == 0 ||
1259           (junction & GTK_JUNCTION_TOP) ||
1260           (junction & GTK_JUNCTION_RIGHT))
1261         cairo_move_to (cr, x + width, y);
1262       else
1263         {
1264           cairo_new_sub_path (cr);
1265           cairo_arc (cr, x + width - radius, y + radius, radius, - G_PI / 4, 0);
1266         }
1267
1268       if (radius == 0 ||
1269           (junction & GTK_JUNCTION_BOTTOM) ||
1270           (junction & GTK_JUNCTION_RIGHT))
1271         cairo_line_to (cr, x + width, y + height);
1272       else
1273         cairo_arc (cr, x + width - radius, y + height - radius, radius, 0, G_PI / 4);
1274     }
1275
1276   if (sides & SIDE_BOTTOM)
1277     {
1278       if (radius != 0 &&
1279           ! (junction & GTK_JUNCTION_RIGHT) &&
1280           ! (junction & GTK_JUNCTION_BOTTOM))
1281         {
1282           if ((sides & SIDE_RIGHT) == 0)
1283             cairo_new_sub_path (cr);
1284
1285           cairo_arc (cr, x + width - radius, y + height - radius, radius, G_PI / 4, G_PI / 2);
1286         }
1287
1288       if (radius == 0 ||
1289           (junction & GTK_JUNCTION_BOTTOM) ||
1290           (junction & GTK_JUNCTION_LEFT))
1291         cairo_line_to (cr, x, y + height);
1292       else
1293         cairo_arc (cr, x + radius, y + height - radius, radius, G_PI / 2, 3 * (G_PI / 4));
1294     }
1295   else
1296     cairo_move_to (cr, x, y + height);
1297
1298   if (sides & SIDE_LEFT)
1299     {
1300       if (radius != 0 &&
1301           ! (junction & GTK_JUNCTION_LEFT) &&
1302           ! (junction & GTK_JUNCTION_BOTTOM))
1303         {
1304           if ((sides & SIDE_BOTTOM) == 0)
1305             cairo_new_sub_path (cr);
1306
1307           cairo_arc (cr, x + radius, y + height - radius, radius, 3 * (G_PI / 4), G_PI);
1308         }
1309
1310       if (radius == 0 ||
1311           (junction & GTK_JUNCTION_TOP) ||
1312           (junction & GTK_JUNCTION_LEFT))
1313         cairo_line_to (cr, x, y);
1314       else
1315         cairo_arc (cr, x + radius, y + radius, radius, G_PI, G_PI + G_PI / 4);
1316     }
1317
1318   if (sides & SIDE_TOP)
1319     {
1320       if (radius != 0 &&
1321           ! (junction & GTK_JUNCTION_TOP) &&
1322           ! (junction & GTK_JUNCTION_LEFT))
1323         {
1324           if ((sides & SIDE_TOP) == 0)
1325             cairo_new_sub_path (cr);
1326
1327           cairo_arc (cr, x + radius, y + radius, radius, 5 * (G_PI / 4), 3 * (G_PI / 2));
1328         }
1329
1330       if (radius == 0 ||
1331           (junction & GTK_JUNCTION_TOP) ||
1332           (junction & GTK_JUNCTION_RIGHT))
1333         cairo_line_to (cr, x + width, y);
1334       else
1335         cairo_arc (cr, x + width - radius, y + radius, radius, 3 * (G_PI / 2), - G_PI / 4);
1336     }
1337 }
1338
1339 static void
1340 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1341                                       cairo_t          *cr,
1342                                       gdouble           x,
1343                                       gdouble           y,
1344                                       gdouble           width,
1345                                       gdouble           height)
1346 {
1347   GdkRGBA *bg_color;
1348   cairo_pattern_t *pattern;
1349   GtkStateFlags flags;
1350   gboolean running;
1351   gdouble progress, alpha = 1;
1352   GtkJunctionSides junction;
1353   gint radius;
1354
1355   flags = gtk_theming_engine_get_state (engine);
1356   junction = gtk_theming_engine_get_junction_sides (engine);
1357   cairo_save (cr);
1358
1359   if (gtk_theming_engine_has_class (engine, "spinbutton") &&
1360       gtk_theming_engine_has_class (engine, "button"))
1361     {
1362       x += 2;
1363       y += 2;
1364       width -= 4;
1365       height -= 4;
1366     }
1367
1368   gtk_theming_engine_get (engine, flags,
1369                           "background-image", &pattern,
1370                           "background-color", &bg_color,
1371                           "border-radius", &radius,
1372                           NULL);
1373
1374   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1375
1376   _cairo_round_rectangle_sides (cr, (gdouble) radius,
1377                                 x, y, width, height,
1378                                 SIDE_ALL, junction);
1379   cairo_clip (cr);
1380
1381   if (gtk_theming_engine_has_class (engine, "background"))
1382     {
1383       cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0); /* transparent */
1384       cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
1385       cairo_paint (cr);
1386     }
1387
1388   cairo_translate (cr, x, y);
1389   cairo_scale (cr, width, height);
1390
1391   if (running)
1392     {
1393       cairo_pattern_t *other_pattern;
1394       GtkStateFlags other_flags;
1395       GdkRGBA *other_bg;
1396       cairo_pattern_t *new_pattern = NULL;
1397
1398       if (flags & GTK_STATE_FLAG_PRELIGHT)
1399         {
1400           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
1401           progress = 1 - progress;
1402         }
1403       else
1404         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
1405
1406       gtk_theming_engine_get (engine, other_flags,
1407                               "background-image", &other_pattern,
1408                               "background-color", &other_bg,
1409                               NULL);
1410
1411       if (pattern && other_pattern)
1412         {
1413           cairo_pattern_type_t type, other_type;
1414           gint n0, n1;
1415
1416           cairo_pattern_get_color_stop_count (pattern, &n0);
1417           cairo_pattern_get_color_stop_count (other_pattern, &n1);
1418           type = cairo_pattern_get_type (pattern);
1419           other_type = cairo_pattern_get_type (other_pattern);
1420
1421           if (type == other_type && n0 == n1)
1422             {
1423               gdouble offset0, red0, green0, blue0, alpha0;
1424               gdouble offset1, red1, green1, blue1, alpha1;
1425               gdouble x00, x01, y00, y01, x10, x11, y10, y11;
1426               gdouble r00, r01, r10, r11;
1427               guint i;
1428
1429               if (type == CAIRO_PATTERN_TYPE_LINEAR)
1430                 {
1431                   cairo_pattern_get_linear_points (pattern, &x00, &y00, &x01, &y01);
1432                   cairo_pattern_get_linear_points (other_pattern, &x10, &y10, &x11, &y11);
1433
1434                   new_pattern = cairo_pattern_create_linear (x00 + (x10 - x00) * progress,
1435                                                              y00 + (y10 - y00) * progress,
1436                                                              x01 + (x11 - x01) * progress,
1437                                                              y01 + (y11 - y01) * progress);
1438                 }
1439               else
1440                 {
1441                   cairo_pattern_get_radial_circles (pattern, &x00, &y00, &r00, &x01, &y01, &r01);
1442                   cairo_pattern_get_radial_circles (other_pattern, &x10, &y10, &r10, &x11, &y11, &r11);
1443
1444                   new_pattern = cairo_pattern_create_radial (x00 + (x10 - x00) * progress,
1445                                                              y00 + (y10 - y00) * progress,
1446                                                              r00 + (r10 - r00) * progress,
1447                                                              x01 + (x11 - x01) * progress,
1448                                                              y01 + (y11 - y01) * progress,
1449                                                              r01 + (r11 - r01) * progress);
1450                 }
1451
1452               cairo_pattern_set_filter (new_pattern, CAIRO_FILTER_FAST);
1453               i = 0;
1454
1455               /* Blend both gradients into one */
1456               while (i < n0 && i < n1)
1457                 {
1458                   cairo_pattern_get_color_stop_rgba (pattern, i,
1459                                                      &offset0,
1460                                                      &red0, &green0, &blue0,
1461                                                      &alpha0);
1462                   cairo_pattern_get_color_stop_rgba (other_pattern, i,
1463                                                      &offset1,
1464                                                      &red1, &green1, &blue1,
1465                                                      &alpha1);
1466
1467                   cairo_pattern_add_color_stop_rgba (new_pattern,
1468                                                      offset0 + ((offset1 - offset0) * progress),
1469                                                      red0 + ((red1 - red0) * progress),
1470                                                      green0 + ((green1 - green0) * progress),
1471                                                      blue0 + ((blue1 - blue0) * progress),
1472                                                      alpha0 + ((alpha1 - alpha0) * progress));
1473                   i++;
1474                 }
1475             }
1476           else
1477             {
1478               /* Different pattern types, or different color
1479                * stop counts, alpha blend both patterns.
1480                */
1481               cairo_rectangle (cr, 0, 0, 1, 1);
1482               cairo_set_source (cr, other_pattern);
1483               cairo_fill_preserve (cr);
1484
1485               /* Set alpha for posterior drawing
1486                * of the target pattern
1487                */
1488               alpha = 1 - progress;
1489             }
1490         }
1491       else if (pattern || other_pattern)
1492         {
1493           cairo_pattern_t *p;
1494           const GdkRGBA *c;
1495           gdouble x0, y0, x1, y1, r0, r1;
1496           gint n, i;
1497
1498           /* Blend a pattern with a color */
1499           if (pattern)
1500             {
1501               p = pattern;
1502               c = other_bg;
1503               progress = 1 - progress;
1504             }
1505           else
1506             {
1507               p = other_pattern;
1508               c = bg_color;
1509             }
1510
1511           if (cairo_pattern_get_type (p) == CAIRO_PATTERN_TYPE_LINEAR)
1512             {
1513               cairo_pattern_get_linear_points (p, &x0, &y0, &x1, &y1);
1514               new_pattern = cairo_pattern_create_linear (x0, y0, x1, y1);
1515             }
1516           else
1517             {
1518               cairo_pattern_get_radial_circles (p, &x0, &y0, &r0, &x1, &y1, &r1);
1519               new_pattern = cairo_pattern_create_radial (x0, y0, r0, x1, y1, r1);
1520             }
1521
1522           cairo_pattern_get_color_stop_count (p, &n);
1523
1524           for (i = 0; i < n; i++)
1525             {
1526               gdouble red1, green1, blue1, alpha1;
1527               gdouble offset;
1528
1529               cairo_pattern_get_color_stop_rgba (p, i,
1530                                                  &offset,
1531                                                  &red1, &green1, &blue1,
1532                                                  &alpha1);
1533               cairo_pattern_add_color_stop_rgba (new_pattern, offset,
1534                                                  c->red + ((red1 - c->red) * progress),
1535                                                  c->green + ((green1 - c->green) * progress),
1536                                                  c->blue + ((blue1 - c->blue) * progress),
1537                                                  c->alpha + ((alpha1 - c->alpha) * progress));
1538             }
1539         }
1540       else
1541         {
1542           const GdkRGBA *color, *other_color;
1543
1544           /* Merge just colors */
1545           color = bg_color;
1546           other_color = other_bg;
1547
1548           new_pattern = cairo_pattern_create_rgba (CLAMP (color->red + ((other_color->red - color->red) * progress), 0, 1),
1549                                                    CLAMP (color->green + ((other_color->green - color->green) * progress), 0, 1),
1550                                                    CLAMP (color->blue + ((other_color->blue - color->blue) * progress), 0, 1),
1551                                                    CLAMP (color->alpha + ((other_color->alpha - color->alpha) * progress), 0, 1));
1552         }
1553
1554       if (new_pattern)
1555         {
1556           /* Replace pattern to use */
1557           cairo_pattern_destroy (pattern);
1558           pattern = new_pattern;
1559         }
1560
1561       if (other_pattern)
1562         cairo_pattern_destroy (other_pattern);
1563
1564       if (other_bg)
1565         gdk_rgba_free (other_bg);
1566     }
1567
1568   cairo_rectangle (cr, 0, 0, 1, 1);
1569
1570   if (pattern)
1571     {
1572       cairo_set_source (cr, pattern);
1573       cairo_pattern_destroy (pattern);
1574     }
1575   else
1576     gdk_cairo_set_source_rgba (cr, bg_color);
1577
1578   if (gtk_theming_engine_has_class (engine, "tooltip"))
1579     {
1580       cairo_fill_preserve (cr);
1581
1582       cairo_set_source_rgb (cr, 0, 0, 0);
1583       cairo_stroke (cr);
1584     }
1585   else
1586     {
1587       if (alpha == 1)
1588         cairo_fill (cr);
1589       else
1590         {
1591           cairo_pattern_t *mask;
1592
1593           mask = cairo_pattern_create_rgba (1, 1, 1, alpha);
1594           cairo_mask (cr, mask);
1595           cairo_pattern_destroy (mask);
1596         }
1597     }
1598
1599   cairo_restore (cr);
1600
1601   gdk_rgba_free (bg_color);
1602 }
1603
1604 static void
1605 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1606                                  cairo_t          *cr,
1607                                  gdouble           x,
1608                                  gdouble           y,
1609                                  gdouble           width,
1610                                  gdouble           height)
1611 {
1612   GtkStateFlags flags;
1613   GdkRGBA lighter;
1614   GdkRGBA *border_color;
1615   Gtk9Slice *slice;
1616   GtkBorderStyle border_style;
1617   gint border_width, radius;
1618   GtkJunctionSides junction;
1619   gdouble d1, d2, m;
1620
1621   flags = gtk_theming_engine_get_state (engine);
1622   junction = gtk_theming_engine_get_junction_sides (engine);
1623
1624   gtk_theming_engine_get (engine, flags,
1625                           "border-image", &slice,
1626                           "border-color", &border_color,
1627                           "border-style", &border_style,
1628                           "border-width", &border_width,
1629                           "border-radius", &radius,
1630                           NULL);
1631
1632   if (slice)
1633     {
1634       gtk_9slice_render (slice, cr, x, y, width, height);
1635       gtk_9slice_unref (slice);
1636     }
1637   else if (border_color &&
1638            border_style != GTK_BORDER_STYLE_NONE)
1639     {
1640       cairo_save (cr);
1641
1642       color_shade (border_color, 1.8, &lighter);
1643
1644       switch (border_style)
1645         {
1646         case GTK_BORDER_STYLE_NONE:
1647           break;
1648         case GTK_BORDER_STYLE_SOLID:
1649           cairo_set_line_width (cr, border_width);
1650
1651           if (border_width > 1)
1652             {
1653               x += (gdouble) border_width / 2;
1654               y += (gdouble) border_width / 2;
1655               width -= border_width;
1656               height -= border_width;
1657             }
1658
1659           _cairo_round_rectangle_sides (cr, (gdouble) radius, x, y, width, height,
1660                                         SIDE_ALL, junction);
1661           gdk_cairo_set_source_rgba (cr, border_color);
1662           cairo_stroke (cr);
1663
1664           break;
1665         case GTK_BORDER_STYLE_INSET:
1666         case GTK_BORDER_STYLE_OUTSET:
1667           cairo_set_line_width (cr, border_width);
1668           cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1669
1670           d1 = d2 = 0;
1671
1672           if (border_width > 1)
1673             {
1674               d1 = (gdouble) border_width / 2;
1675               d2 = (gdouble) (border_width - (gint) d1) + 1;
1676             }
1677
1678           cairo_save (cr);
1679
1680           m = MIN (width, height);
1681           m /= 2;
1682
1683           /* Only needed for square frames to have a 3D-like
1684            * feeling, for rounded ones, the arc will ensure
1685            * the stroke is painted to end at 45°.
1686            */
1687           if (radius == 0)
1688             {
1689               cairo_move_to (cr, x, y + height);
1690               cairo_line_to (cr, x + m, y + height - m);
1691               cairo_line_to (cr, x + width - m, y + m);
1692               cairo_line_to (cr, x + width, y);
1693               cairo_line_to (cr, x + width, y + height);
1694               cairo_close_path (cr);
1695
1696               cairo_clip (cr);
1697             }
1698
1699           if (border_style == GTK_BORDER_STYLE_INSET)
1700             gdk_cairo_set_source_rgba (cr, &lighter);
1701           else
1702             gdk_cairo_set_source_rgba (cr, border_color);
1703
1704           _cairo_round_rectangle_sides (cr, (gdouble) radius,
1705                                         x + d1, y + d1,
1706                                         width - d2, height - d2,
1707                                         SIDE_BOTTOM | SIDE_RIGHT, junction);
1708           cairo_stroke (cr);
1709
1710           cairo_restore (cr);
1711
1712           cairo_save (cr);
1713
1714           if (radius == 0)
1715             {
1716               cairo_move_to (cr, x, y + height);
1717               cairo_line_to (cr, x + m, y + height - m);
1718               cairo_line_to (cr, x + width - m, y + m);
1719               cairo_line_to (cr, x + width, y);
1720               cairo_line_to (cr, x, y);
1721               cairo_close_path (cr);
1722
1723               cairo_clip (cr);
1724             }
1725
1726           if (border_style == GTK_BORDER_STYLE_INSET)
1727             gdk_cairo_set_source_rgba (cr, border_color);
1728           else
1729             gdk_cairo_set_source_rgba (cr, &lighter);
1730
1731           _cairo_round_rectangle_sides (cr, (gdouble) radius,
1732                                         x + d1, y + d1,
1733                                         width - d2, height - d2,
1734                                         SIDE_TOP | SIDE_LEFT, junction);
1735           cairo_stroke (cr);
1736
1737           cairo_restore (cr);
1738
1739           break;
1740         }
1741
1742       cairo_restore (cr);
1743     }
1744
1745   if (border_color)
1746     gdk_rgba_free (border_color);
1747 }
1748
1749 static void
1750 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1751                                     cairo_t          *cr,
1752                                     gdouble           x,
1753                                     gdouble           y,
1754                                     gdouble           width,
1755                                     gdouble           height)
1756 {
1757   GtkStateFlags flags;
1758   GdkRGBA *bg_color, *fg_color;
1759   double vertical_overshoot;
1760   int diameter;
1761   double radius;
1762   double interp;                /* interpolation factor for center position */
1763   double x_double_horz, y_double_horz;
1764   double x_double_vert, y_double_vert;
1765   double x_double, y_double;
1766   gdouble angle;
1767   gint line_width;
1768
1769   cairo_save (cr);
1770   flags = gtk_theming_engine_get_state (engine);
1771
1772   gtk_theming_engine_get (engine, flags,
1773                           "color", &fg_color,
1774                           "background-color", &bg_color,
1775                           NULL);
1776
1777   line_width = 1;
1778
1779   /* FIXME: LTR/RTL */
1780   if (flags & GTK_STATE_FLAG_ACTIVE)
1781     {
1782       angle = G_PI / 2;
1783       interp = 1.0;
1784     }
1785   else
1786     {
1787       angle = 0;
1788       interp = 0;
1789     }
1790
1791   /* Compute distance that the stroke extends beyonds the end
1792    * of the triangle we draw.
1793    */
1794   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
1795
1796   /* For odd line widths, we end the vertical line of the triangle
1797    * at a half pixel, so we round differently.
1798    */
1799   if (line_width % 2 == 1)
1800     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
1801   else
1802     vertical_overshoot = ceil (vertical_overshoot);
1803
1804   /* Adjust the size of the triangle we draw so that the entire stroke fits
1805    */
1806   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
1807
1808   /* If the line width is odd, we want the diameter to be even,
1809    * and vice versa, so force the sum to be odd. This relationship
1810    * makes the point of the triangle look right.
1811    */
1812   diameter -= (1 - (diameter + line_width) % 2);
1813
1814   radius = diameter / 2.;
1815
1816   /* Adjust the center so that the stroke is properly aligned with
1817    * the pixel grid. The center adjustment is different for the
1818    * horizontal and vertical orientations. For intermediate positions
1819    * we interpolate between the two.
1820    */
1821   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1822   y_double_vert = (y + height / 2) - 0.5;
1823
1824   x_double_horz = (x + width / 2) - 0.5;
1825   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1826
1827   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
1828   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
1829
1830   cairo_translate (cr, x_double, y_double);
1831   cairo_rotate (cr, angle);
1832
1833   cairo_move_to (cr, - radius / 2., - radius);
1834   cairo_line_to (cr,   radius / 2.,   0);
1835   cairo_line_to (cr, - radius / 2.,   radius);
1836   cairo_close_path (cr);
1837
1838   cairo_set_line_width (cr, line_width);
1839
1840   gdk_cairo_set_source_rgba (cr, fg_color);
1841
1842   cairo_fill_preserve (cr);
1843
1844   gdk_cairo_set_source_rgba (cr, fg_color);
1845   cairo_stroke (cr);
1846
1847   cairo_restore (cr);
1848
1849   gdk_rgba_free (fg_color);
1850   gdk_rgba_free (bg_color);
1851 }
1852
1853 static void
1854 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
1855                                  cairo_t          *cr,
1856                                  gdouble           x,
1857                                  gdouble           y,
1858                                  gdouble           width,
1859                                  gdouble           height)
1860 {
1861   GtkStateFlags flags;
1862   GdkRGBA *color;
1863   gint line_width;
1864   gint8 *dash_list;
1865
1866   cairo_save (cr);
1867   flags = gtk_theming_engine_get_state (engine);
1868
1869   gtk_theming_engine_get (engine, flags,
1870                           "color", &color,
1871                           NULL);
1872
1873   gtk_theming_engine_get_style (engine,
1874                                 "focus-line-width", &line_width,
1875                                 "focus-line-pattern", (gchar *) &dash_list,
1876                                 NULL);
1877
1878   cairo_set_line_width (cr, (gdouble) line_width);
1879
1880   if (dash_list[0])
1881     {
1882       gint n_dashes = strlen ((const gchar *) dash_list);
1883       gdouble *dashes = g_new (gdouble, n_dashes);
1884       gdouble total_length = 0;
1885       gdouble dash_offset;
1886       gint i;
1887
1888       for (i = 0; i < n_dashes; i++)
1889         {
1890           dashes[i] = dash_list[i];
1891           total_length += dash_list[i];
1892         }
1893
1894       /* The dash offset here aligns the pattern to integer pixels
1895        * by starting the dash at the right side of the left border
1896        * Negative dash offsets in cairo don't work
1897        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
1898        */
1899       dash_offset = - line_width / 2.;
1900
1901       while (dash_offset < 0)
1902         dash_offset += total_length;
1903
1904       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
1905       g_free (dashes);
1906     }
1907
1908   cairo_rectangle (cr,
1909                    x + line_width / 2.,
1910                    y + line_width / 2.,
1911                    width - line_width,
1912                    height - line_width);
1913
1914   gdk_cairo_set_source_rgba (cr, color);
1915   cairo_stroke (cr);
1916
1917   cairo_restore (cr);
1918
1919   gdk_rgba_free (color);
1920   g_free (dash_list);
1921 }
1922
1923 static void
1924 gtk_theming_engine_render_line (GtkThemingEngine *engine,
1925                                 cairo_t          *cr,
1926                                 gdouble           x0,
1927                                 gdouble           y0,
1928                                 gdouble           x1,
1929                                 gdouble           y1)
1930 {
1931   GdkRGBA *bg_color, darker, lighter;
1932   GtkStateFlags flags;
1933   gint i, thickness, thickness_dark, thickness_light, len;
1934   cairo_matrix_t matrix;
1935   gdouble angle;
1936
1937   /* FIXME: thickness */
1938   thickness = 2;
1939   thickness_dark = thickness / 2;
1940   thickness_light = thickness - thickness_dark;
1941
1942   flags = gtk_theming_engine_get_state (engine);
1943   cairo_save (cr);
1944
1945   gtk_theming_engine_get (engine, flags,
1946                           "background-color", &bg_color,
1947                           NULL);
1948   color_shade (bg_color, 0.7, &darker);
1949   color_shade (bg_color, 1.3, &lighter);
1950
1951   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1952   cairo_set_line_width (cr, 1);
1953
1954   angle = atan2 (x1 - x0, y1 - y0);
1955   angle = (2 * G_PI) - angle;
1956   angle += G_PI / 2;
1957
1958   cairo_get_matrix (cr, &matrix);
1959   cairo_matrix_translate (&matrix, x0, y0);
1960   cairo_matrix_rotate (&matrix, angle);
1961   cairo_set_matrix (cr, &matrix);
1962
1963   x1 -= x0;
1964   y1 -= y0;
1965
1966   len = (gint) sqrt ((x1 * x1) + (y1 * y1));
1967
1968   y0 = -thickness_dark;
1969
1970   for (i = 0; i < thickness_dark; i++)
1971     {
1972       gdk_cairo_set_source_rgba (cr, &lighter);
1973       add_path_line (cr, len - i - 1.5, y0, len - 0.5, y0);
1974       cairo_stroke (cr);
1975
1976       gdk_cairo_set_source_rgba (cr, &darker);
1977       add_path_line (cr, 0.5, y0, len - i - 1.5, y0);
1978       cairo_stroke (cr);
1979
1980       y0++;
1981     }
1982
1983   for (i = 0; i < thickness_light; i++)
1984     {
1985       gdk_cairo_set_source_rgba (cr, &darker);
1986       add_path_line (cr, 0.5, y0, thickness_light - i + 0.5, y0);
1987       cairo_stroke (cr);
1988
1989       gdk_cairo_set_source_rgba (cr, &lighter);
1990       add_path_line (cr, thickness_light - i + 0.5, y0, len - 0.5, y0);
1991       cairo_stroke (cr);
1992
1993       y0++;
1994     }
1995
1996   cairo_restore (cr);
1997
1998   gdk_rgba_free (bg_color);
1999 }
2000
2001 static void
2002 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2003                                   cairo_t          *cr,
2004                                   gdouble           x,
2005                                   gdouble           y,
2006                                   PangoLayout      *layout)
2007 {
2008   const PangoMatrix *matrix;
2009   GdkRGBA *fg_color;
2010   GtkStateFlags flags;
2011   GdkScreen *screen;
2012
2013   cairo_save (cr);
2014   flags = gtk_theming_engine_get_state (engine);
2015
2016   gtk_theming_engine_get (engine, flags,
2017                           "color", &fg_color,
2018                           NULL);
2019
2020   screen = gtk_theming_engine_get_screen (engine);
2021   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2022
2023   if (matrix)
2024     {
2025       cairo_matrix_t cairo_matrix;
2026       PangoMatrix tmp_matrix;
2027       PangoRectangle rect;
2028
2029       cairo_matrix_init (&cairo_matrix,
2030                          matrix->xx, matrix->yx,
2031                          matrix->xy, matrix->yy,
2032                          matrix->x0, matrix->y0);
2033
2034       pango_layout_get_extents (layout, NULL, &rect);
2035       pango_matrix_transform_rectangle (matrix, &rect);
2036       pango_extents_to_pixels (&rect, NULL);
2037
2038       tmp_matrix = *matrix;
2039       cairo_matrix.x0 += x - rect.x;
2040       cairo_matrix.y0 += y - rect.y;
2041
2042       cairo_set_matrix (cr, &cairo_matrix);
2043     }
2044   else
2045     cairo_translate (cr, x, y);
2046
2047   if (flags & GTK_STATE_FLAG_INSENSITIVE)
2048     {
2049       cairo_save (cr);
2050       cairo_set_source_rgb (cr, 1, 1, 1);
2051       cairo_move_to (cr, 1, 1);
2052       _gtk_pango_fill_layout (cr, layout);
2053       cairo_restore (cr);
2054     }
2055
2056   gdk_cairo_set_source_rgba (cr, fg_color);
2057   pango_cairo_show_layout (cr, layout);
2058
2059   cairo_restore (cr);
2060
2061   gdk_rgba_free (fg_color);
2062 }
2063
2064 static void
2065 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2066                                   cairo_t          *cr,
2067                                   gdouble           x,
2068                                   gdouble           y,
2069                                   gdouble           width,
2070                                   gdouble           height,
2071                                   GtkOrientation    orientation)
2072 {
2073   const GtkWidgetPath *path;
2074   gint thickness;
2075
2076   path = gtk_theming_engine_get_path (engine);
2077
2078   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2079   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2080
2081   /* FIXME: thickness */
2082   thickness = 2;
2083
2084   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
2085     {
2086       if (orientation == GTK_ORIENTATION_VERTICAL)
2087         gtk_theming_engine_render_line (engine, cr,
2088                                         x + thickness,
2089                                         y + (gint) height / 2,
2090                                         x + width - thickness - 1,
2091                                         y + (gint) height / 2);
2092       else
2093         gtk_theming_engine_render_line (engine, cr,
2094                                         x + (gint) width / 2,
2095                                         y + thickness,
2096                                         x + (gint) width / 2,
2097                                         y + height - thickness - 1);
2098     }
2099 }
2100
2101 static void
2102 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2103                                      cairo_t          *cr,
2104                                      gdouble           x,
2105                                      gdouble           y,
2106                                      gdouble           width,
2107                                      gdouble           height,
2108                                      GtkPositionType   gap_side,
2109                                      gdouble           xy0_gap,
2110                                      gdouble           xy1_gap)
2111 {
2112   GtkStateFlags flags;
2113   GdkRGBA *bg_color;
2114   GdkRGBA lighter, darker;
2115   guint sides;
2116
2117   cairo_save (cr);
2118   flags = gtk_theming_engine_get_state (engine);
2119
2120   cairo_set_line_width (cr, 1);
2121
2122   gtk_theming_engine_get (engine, flags,
2123                           "background-color", &bg_color,
2124                           NULL);
2125   color_shade (bg_color, 0.7, &darker);
2126   color_shade (bg_color, 1.3, &lighter);
2127
2128   if (gtk_theming_engine_has_class (engine, "frame"))
2129     {
2130       if (gap_side == GTK_POS_RIGHT)
2131         sides = SIDE_BOTTOM;
2132       else if (gap_side == GTK_POS_BOTTOM)
2133         sides = SIDE_RIGHT;
2134       else
2135         sides = SIDE_BOTTOM | SIDE_RIGHT;
2136
2137       gdk_cairo_set_source_rgba (cr, &lighter);
2138       add_path_rectangle_sides (cr, x , y, width , height, sides);
2139       cairo_stroke (cr);
2140
2141       gdk_cairo_set_source_rgba (cr, &darker);
2142       add_path_rectangle_sides (cr, x, y, width - 1, height - 1, sides);
2143       cairo_stroke (cr);
2144
2145       if (gap_side == GTK_POS_RIGHT ||
2146           gap_side == GTK_POS_BOTTOM)
2147         {
2148           gdk_cairo_set_source_rgba (cr, &darker);
2149           add_path_gap_side (cr, gap_side,
2150                              x + 1, y + 1, width - 4, height - 4,
2151                              xy0_gap, xy1_gap);
2152           cairo_stroke (cr);
2153
2154           gdk_cairo_set_source_rgba (cr, &lighter);
2155           add_path_gap_side (cr, gap_side,
2156                              x, y, width, height,
2157                              xy0_gap, xy1_gap);
2158           cairo_stroke (cr);
2159         }
2160
2161       if (gap_side == GTK_POS_LEFT)
2162         sides = SIDE_TOP;
2163       else if (gap_side == GTK_POS_TOP)
2164         sides = SIDE_LEFT;
2165       else
2166         sides = SIDE_TOP | SIDE_LEFT;
2167
2168       gdk_cairo_set_source_rgba (cr, &lighter);
2169       add_path_rectangle_sides (cr, x + 1, y + 1, width - 2, height - 3, sides);
2170       cairo_stroke (cr);
2171
2172       gdk_cairo_set_source_rgba (cr, &darker);
2173       add_path_rectangle_sides (cr, x, y, width - 1, height - 1, sides);
2174       cairo_stroke (cr);
2175
2176       if (gap_side == GTK_POS_LEFT ||
2177           gap_side == GTK_POS_TOP)
2178         {
2179           gdk_cairo_set_source_rgba (cr, &lighter);
2180           add_path_gap_side (cr, gap_side,
2181                              x + 1, y + 1, width - 4, height - 4,
2182                              xy0_gap, xy1_gap);
2183           cairo_stroke (cr);
2184
2185           gdk_cairo_set_source_rgba (cr, &darker);
2186           add_path_gap_side (cr, gap_side,
2187                              x, y, width - 2, height - 2,
2188                              xy0_gap, xy1_gap);
2189           cairo_stroke (cr);
2190         }
2191     }
2192   else
2193     {
2194       if (gap_side == GTK_POS_RIGHT)
2195         sides = SIDE_BOTTOM;
2196       else if (gap_side == GTK_POS_BOTTOM)
2197         sides = SIDE_RIGHT;
2198       else
2199         sides = SIDE_BOTTOM | SIDE_RIGHT;
2200
2201       gdk_cairo_set_source_rgba (cr, &darker);
2202       add_path_rectangle_sides (cr, x + 1, y, width - 2, height, sides);
2203       add_path_rectangle_sides (cr, x, y + 1, width, height - 2, sides);
2204       cairo_stroke (cr);
2205
2206       cairo_set_source_rgb (cr, 0, 0, 0);
2207       add_path_rectangle_sides (cr, x, y, width, height, sides);
2208       cairo_stroke (cr);
2209
2210       if (gap_side == GTK_POS_RIGHT ||
2211           gap_side == GTK_POS_BOTTOM)
2212         {
2213           gdk_cairo_set_source_rgba (cr, &darker);
2214           add_path_gap_side (cr, gap_side,
2215                              x, y, width - 2, height - 2,
2216                              xy0_gap, xy1_gap);
2217           cairo_stroke (cr);
2218
2219           cairo_set_source_rgb (cr, 0, 0, 0);
2220           add_path_gap_side (cr, gap_side,
2221                              x, y, width - 1, height - 1,
2222                              xy0_gap, xy1_gap);
2223           cairo_stroke (cr);
2224         }
2225
2226       if (gap_side == GTK_POS_LEFT)
2227         sides = SIDE_TOP;
2228       else if (gap_side == GTK_POS_TOP)
2229         sides = SIDE_LEFT;
2230       else
2231         sides = SIDE_TOP | SIDE_LEFT;
2232
2233       gdk_cairo_set_source_rgba (cr, &lighter);
2234       add_path_rectangle_sides (cr, x, y, width, height, sides);
2235       cairo_stroke (cr);
2236
2237       if (gap_side == GTK_POS_LEFT ||
2238           gap_side == GTK_POS_TOP)
2239         {
2240           add_path_gap_side (cr, gap_side,
2241                              x, y, width, height,
2242                              xy0_gap, xy1_gap);
2243           cairo_stroke (cr);
2244         }
2245     }
2246
2247   cairo_restore (cr);
2248
2249   gdk_rgba_free (bg_color);
2250 }
2251
2252 static void
2253 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2254                                      cairo_t          *cr,
2255                                      gdouble           x,
2256                                      gdouble           y,
2257                                      gdouble           width,
2258                                      gdouble           height,
2259                                      GtkPositionType   gap_side)
2260 {
2261   GtkStateFlags flags;
2262   GdkRGBA *bg_color;
2263   GdkRGBA lighter, darker;
2264
2265   cairo_save (cr);
2266   flags = gtk_theming_engine_get_state (engine);
2267
2268   cairo_set_line_width (cr, 1);
2269
2270   gtk_theming_engine_get (engine, flags,
2271                           "background-color", &bg_color,
2272                           NULL);
2273   color_shade (bg_color, 0.7, &darker);
2274   color_shade (bg_color, 1.3, &lighter);
2275
2276   switch (gap_side)
2277     {
2278     case GTK_POS_TOP:
2279       gdk_cairo_set_source_rgba (cr, bg_color);
2280       cairo_rectangle (cr, x + 1, y, width - 2, height);
2281       cairo_fill (cr);
2282
2283       gdk_cairo_set_source_rgba (cr, &lighter);
2284       add_path_line (cr, x, y, x, y + height - 2);
2285       cairo_stroke (cr);
2286
2287       gdk_cairo_set_source_rgba (cr, bg_color);
2288       add_path_line (cr, x + 1, y, x + 1, y + height - 2);
2289       cairo_stroke (cr);
2290
2291       gdk_cairo_set_source_rgba (cr, &darker);
2292       add_path_line (cr, x + 2, y + height - 2, x + width - 2, y + height - 2);
2293       add_path_line (cr, x + width - 2, y, x + width - 2, y + height - 2);
2294       cairo_stroke (cr);
2295
2296       cairo_set_source_rgb (cr, 0, 0, 0);
2297       add_path_line (cr, x + 1, y + height - 1, x + width - 2, y + height - 1);
2298       add_path_line (cr, x + width - 1, y, x + width - 1, y + height - 2);
2299       cairo_stroke (cr);
2300
2301       break;
2302     case GTK_POS_BOTTOM:
2303       gdk_cairo_set_source_rgba(cr, bg_color);
2304       cairo_rectangle (cr, x + 1, y, width - 2, height);
2305       cairo_fill (cr);
2306
2307       gdk_cairo_set_source_rgba (cr, &lighter);
2308       add_path_line (cr, x + 1, y, x + width - 2, y);
2309       add_path_line (cr, x, y + 1, x, y + height - 1);
2310       cairo_stroke (cr);
2311
2312       gdk_cairo_set_source_rgba (cr, bg_color);
2313       add_path_line (cr, x + 1, y + 1, x + width - 2, y + 1);
2314       add_path_line (cr, x + 1, y + 1, x + 1, y + height - 1);
2315       cairo_stroke (cr);
2316
2317       gdk_cairo_set_source_rgba (cr, &darker);
2318       add_path_line (cr, x + width - 2, y + 2, x + width - 2, y + height - 1);
2319       cairo_stroke (cr);
2320
2321       cairo_set_source_rgb (cr, 0, 0, 0);
2322       add_path_line (cr, x + width - 1, y + 1, x + width - 1, y + height - 1);
2323       cairo_stroke (cr);
2324
2325       break;
2326     case GTK_POS_LEFT:
2327       gdk_cairo_set_source_rgba (cr, bg_color);
2328       cairo_rectangle (cr, x, y + 1, width, height - 2);
2329       cairo_fill (cr);
2330
2331       gdk_cairo_set_source_rgba (cr, &lighter);
2332       add_path_line (cr, x, y, x + width - 2, y);
2333       cairo_stroke (cr);
2334
2335       gdk_cairo_set_source_rgba (cr, bg_color);
2336       add_path_line (cr, x + 1, y + 1, x + width - 2, y + 1);
2337       cairo_stroke (cr);
2338
2339       gdk_cairo_set_source_rgba (cr, &darker);
2340       add_path_line (cr, x, y + height - 2, x + width - 2, y + height - 2);
2341       add_path_line (cr, x + width - 2, y + 2, x + width - 2, y + height - 2);
2342       cairo_stroke (cr);
2343
2344       cairo_set_source_rgb (cr, 0, 0, 0);
2345       add_path_line (cr, x, y + height - 1, x + width - 2, y + height - 1);
2346       add_path_line (cr, x + width - 1, y + 1, x + width - 1, y + height - 2);
2347       cairo_stroke (cr);
2348
2349       break;
2350     case GTK_POS_RIGHT:
2351       gdk_cairo_set_source_rgba (cr, bg_color);
2352       cairo_rectangle (cr, x, y + 1, width, height - 2);
2353       cairo_fill (cr);
2354
2355       gdk_cairo_set_source_rgba (cr, &lighter);
2356       add_path_line (cr, x + 1, y, x + width - 1, y);
2357       add_path_line (cr, x, y + 1, x, y + height - 2);
2358       cairo_stroke (cr);
2359
2360       gdk_cairo_set_source_rgba (cr, bg_color);
2361       add_path_line (cr, x + 1, y + 1, x + width - 1, y + 1);
2362       add_path_line (cr, x + 1, y + 1, x + 1, y + height - 2);
2363       cairo_stroke (cr);
2364
2365       gdk_cairo_set_source_rgba (cr, &darker);
2366       add_path_line (cr, x + 2, y + height - 2, x + width - 1, y + height - 2);
2367       cairo_stroke (cr);
2368
2369       cairo_set_source_rgb (cr, 0, 0, 0);
2370       add_path_line (cr, x + 1, y + height - 1, x + width - 1, y + height - 1);
2371       cairo_stroke (cr);
2372
2373       break;
2374     }
2375
2376   cairo_restore (cr);
2377
2378   gdk_rgba_free (bg_color);
2379 }
2380
2381 static void
2382 render_dot (cairo_t       *cr,
2383             const GdkRGBA *lighter,
2384             const GdkRGBA *darker,
2385             gdouble        x,
2386             gdouble        y,
2387             gdouble        size)
2388 {
2389   size = CLAMP ((gint) size, 2, 3);
2390
2391   if (size == 2)
2392     {
2393       gdk_cairo_set_source_rgba (cr, lighter);
2394       cairo_rectangle (cr, x, y, 1, 1);
2395       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2396       cairo_fill (cr);
2397     }
2398   else if (size == 3)
2399     {
2400       gdk_cairo_set_source_rgba (cr, lighter);
2401       cairo_rectangle (cr, x, y, 2, 1);
2402       cairo_rectangle (cr, x, y, 1, 2);
2403       cairo_fill (cr);
2404
2405       gdk_cairo_set_source_rgba (cr, darker);
2406       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2407       cairo_rectangle (cr, x + 2, y, 1, 2);
2408       cairo_fill (cr);
2409     }
2410 }
2411
2412 static void
2413 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2414                                   cairo_t          *cr,
2415                                   gdouble           x,
2416                                   gdouble           y,
2417                                   gdouble           width,
2418                                   gdouble           height)
2419 {
2420   GtkStateFlags flags;
2421   GdkRGBA *bg_color;
2422   GdkRGBA lighter, darker;
2423   gint xx, yy;
2424
2425   cairo_save (cr);
2426   flags = gtk_theming_engine_get_state (engine);
2427
2428   cairo_set_line_width (cr, 1);
2429
2430   gtk_theming_engine_get (engine, flags,
2431                           "background-color", &bg_color,
2432                           NULL);
2433   color_shade (bg_color, 0.7, &darker);
2434   color_shade (bg_color, 1.3, &lighter);
2435
2436   gdk_cairo_set_source_rgba (cr, bg_color);
2437   cairo_rectangle (cr, x, y, width, height);
2438   cairo_fill (cr);
2439
2440   if (gtk_theming_engine_has_class (engine, "grip"))
2441     {
2442       GtkJunctionSides sides;
2443       gint skip = -1;
2444
2445       cairo_save (cr);
2446
2447       cairo_set_line_width (cr, 1.0);
2448       sides = gtk_theming_engine_get_junction_sides (engine);
2449
2450       /* reduce confusing values to a meaningful state */
2451       if (sides & (GTK_JUNCTION_LEFT | GTK_JUNCTION_RIGHT))
2452         sides &= ~(GTK_JUNCTION_LEFT);
2453
2454       if (sides & (GTK_JUNCTION_TOP | GTK_JUNCTION_BOTTOM))
2455         sides &= ~(GTK_JUNCTION_TOP);
2456
2457       if (sides == 0)
2458         sides = (GTK_JUNCTION_BOTTOM | GTK_JUNCTION_RIGHT);
2459
2460       /* align drawing area to the connected side */
2461       if (sides == GTK_JUNCTION_LEFT)
2462         {
2463           if (height < width)
2464             width = height;
2465         }
2466       else if (sides & (GTK_JUNCTION_LEFT | GTK_JUNCTION_TOP))
2467         {
2468           if (width < height)
2469             height = width;
2470           else if (height < width)
2471             width = height;
2472
2473           skip = 2;
2474         }
2475       else if (sides & (GTK_JUNCTION_LEFT | GTK_JUNCTION_BOTTOM))
2476         {
2477           /* make it square, aligning to bottom left */
2478           if (width < height)
2479             {
2480               y += (height - width);
2481               height = width;
2482             }
2483           else if (height < width)
2484             width = height;
2485
2486           skip = 1;
2487         }
2488       if (sides == GTK_JUNCTION_RIGHT)
2489         {
2490           /* aligning to right */
2491           if (height < width)
2492             {
2493               x += (width - height);
2494               width = height;
2495             }
2496         }
2497       else if (sides & (GTK_JUNCTION_RIGHT | GTK_JUNCTION_TOP))
2498         {
2499           if (width < height)
2500             height = width;
2501           else if (height < width)
2502             {
2503               x += (width - height);
2504               width = height;
2505             }
2506
2507           skip = 3;
2508         }
2509       else if (sides & (GTK_JUNCTION_RIGHT | GTK_JUNCTION_BOTTOM))
2510         {
2511           /* make it square, aligning to bottom right */
2512           if (width < height)
2513             {
2514               y += (height - width);
2515               height = width;
2516             }
2517           else if (height < width)
2518             {
2519               x += (width - height);
2520               width = height;
2521             }
2522
2523           skip = 0;
2524         }
2525       else if (sides == GTK_JUNCTION_TOP)
2526         {
2527           if (width < height)
2528             height = width;
2529         }
2530       else if (sides == GTK_JUNCTION_BOTTOM)
2531         {
2532           /* align to bottom */
2533           if (width < height)
2534             {
2535               y += (height - width);
2536               height = width;
2537             }
2538         }
2539       else
2540         g_assert_not_reached ();
2541
2542       if (sides == GTK_JUNCTION_LEFT ||
2543           sides == GTK_JUNCTION_RIGHT)
2544         {
2545           gint xi;
2546
2547           xi = x;
2548
2549           while (xi < x + width)
2550             {
2551               gdk_cairo_set_source_rgba (cr, &lighter);
2552               add_path_line (cr, x, y, x, y + height);
2553               cairo_stroke (cr);
2554               xi++;
2555
2556               gdk_cairo_set_source_rgba (cr, &darker);
2557               add_path_line (cr, xi, y, xi, y + height);
2558               cairo_stroke (cr);
2559               xi += 2;
2560             }
2561         }
2562       else if (sides == GTK_JUNCTION_TOP ||
2563                sides == GTK_JUNCTION_BOTTOM)
2564         {
2565           gint yi;
2566
2567           yi = y;
2568
2569           while (yi < y + height)
2570             {
2571               gdk_cairo_set_source_rgba (cr, &lighter);
2572               add_path_line (cr, x, yi, x + width, yi);
2573               cairo_stroke (cr);
2574               yi++;
2575
2576               gdk_cairo_set_source_rgba (cr, &darker);
2577               add_path_line (cr, x, yi, x + width, yi);
2578               cairo_stroke (cr);
2579               yi+= 2;
2580             }
2581         }
2582       else if (sides == (GTK_JUNCTION_TOP | GTK_JUNCTION_LEFT))
2583         {
2584           gint xi, yi;
2585
2586           xi = x + width;
2587           yi = y + height;
2588
2589           while (xi > x + 3)
2590             {
2591               gdk_cairo_set_source_rgba (cr, &darker);
2592               add_path_line (cr, xi, y, x, yi);
2593               cairo_stroke (cr);
2594
2595               --xi;
2596               --yi;
2597
2598               add_path_line (cr, xi, y, x, yi);
2599               cairo_stroke (cr);
2600
2601               --xi;
2602               --yi;
2603
2604               gdk_cairo_set_source_rgba (cr, &lighter);
2605               add_path_line (cr, xi, y, x, yi);
2606               cairo_stroke (cr);
2607
2608               xi -= 3;
2609               yi -= 3;
2610             }
2611         }
2612       else if (sides == (GTK_JUNCTION_TOP | GTK_JUNCTION_RIGHT))
2613         {
2614           gint xi, yi;
2615
2616           xi = x;
2617           yi = y + height;
2618
2619           while (xi < (x + width - 3))
2620             {
2621               gdk_cairo_set_source_rgba (cr, &lighter);
2622               add_path_line (cr, xi, y, x + width, yi);
2623               cairo_stroke (cr);
2624
2625               ++xi;
2626               --yi;
2627
2628               gdk_cairo_set_source_rgba (cr, &darker);
2629               add_path_line (cr, xi, y, x + width, yi);
2630               cairo_stroke (cr);
2631
2632               ++xi;
2633               --yi;
2634
2635               add_path_line (cr, xi, y, x + width, yi);
2636               cairo_stroke (cr);
2637
2638               xi += 3;
2639               yi -= 3;
2640             }
2641         }
2642       else if (sides == (GTK_JUNCTION_BOTTOM | GTK_JUNCTION_LEFT))
2643         {
2644           gint xi, yi;
2645
2646           xi = x + width;
2647           yi = y;
2648
2649           while (xi > x + 3)
2650             {
2651               gdk_cairo_set_source_rgba (cr, &darker);
2652               add_path_line (cr, x, yi, xi, y + height);
2653               cairo_stroke (cr);
2654
2655               --xi;
2656               ++yi;
2657
2658               add_path_line (cr, x, yi, xi, y + height);
2659               cairo_stroke (cr);
2660
2661               --xi;
2662               ++yi;
2663
2664               gdk_cairo_set_source_rgba (cr, &lighter);
2665               add_path_line (cr, x, yi, xi, y + height);
2666               cairo_stroke (cr);
2667
2668               xi -= 3;
2669               yi += 3;
2670             }
2671         }
2672       else if (sides == (GTK_JUNCTION_BOTTOM | GTK_JUNCTION_RIGHT))
2673         {
2674           gint xi, yi;
2675
2676           xi = x;
2677           yi = y;
2678
2679           while (xi < (x + width - 3))
2680             {
2681               gdk_cairo_set_source_rgba (cr, &lighter);
2682               add_path_line (cr, xi, y + height, x + width, yi);
2683               cairo_stroke (cr);
2684
2685               ++xi;
2686               ++yi;
2687
2688               gdk_cairo_set_source_rgba (cr, &darker);
2689               add_path_line (cr, xi, y + height, x + width, yi);
2690               cairo_stroke (cr);
2691
2692               ++xi;
2693               ++yi;
2694
2695               add_path_line (cr, xi, y + height, x + width, yi);
2696               cairo_stroke (cr);
2697
2698               xi += 3;
2699               yi += 3;
2700             }
2701         }
2702
2703       cairo_restore (cr);
2704     }
2705   else if (gtk_theming_engine_has_class (engine, "paned"))
2706     {
2707       if (width > height)
2708         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2709           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2710       else
2711         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2712           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2713     }
2714   else
2715     {
2716       for (yy = y; yy < y + height; yy += 3)
2717         for (xx = x; xx < x + width; xx += 6)
2718           {
2719             render_dot (cr, &lighter, &darker, xx, yy, 2);
2720             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2721           }
2722     }
2723
2724   cairo_restore (cr);
2725
2726   gdk_rgba_free (bg_color);
2727 }
2728
2729 static void
2730 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2731                                     cairo_t          *cr,
2732                                     gdouble           x,
2733                                     gdouble           y,
2734                                     gdouble           width,
2735                                     gdouble           height)
2736 {
2737   if (gtk_theming_engine_has_class (engine, "spinner"))
2738     {
2739       GtkStateFlags state;
2740       guint num_steps, step;
2741       GdkRGBA *color;
2742       gdouble dx, dy;
2743       gdouble progress;
2744       gdouble radius;
2745       gdouble half;
2746       gint i;
2747
2748       gtk_theming_engine_get_style (engine,
2749                                     "num-steps", &num_steps,
2750                                     NULL);
2751
2752       state = gtk_theming_engine_get_state (engine);
2753       gtk_theming_engine_get (engine, state,
2754                               "color", &color,
2755                               NULL);
2756       if (num_steps == 0)
2757         num_steps = 12;
2758
2759       if (gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
2760         step = (guint) (progress * num_steps);
2761       else
2762         step = 0;
2763
2764       cairo_save (cr);
2765
2766       cairo_translate (cr, x, y);
2767
2768       /* draw clip region */
2769       cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2770
2771       dx = width / 2;
2772       dy = height / 2;
2773       radius = MIN (width / 2, height / 2);
2774       half = num_steps / 2;
2775
2776       for (i = 0; i < num_steps; i++)
2777         {
2778           gint inset = 0.7 * radius;
2779
2780           /* transparency is a function of time and intial value */
2781           gdouble t = (gdouble) ((i + num_steps - step)
2782                                  % num_steps) / num_steps;
2783
2784           cairo_save (cr);
2785
2786           cairo_set_source_rgba (cr,
2787                                  color->red,
2788                                  color->green,
2789                                  color->blue,
2790                                  color->alpha * t);
2791
2792           cairo_set_line_width (cr, 2.0);
2793           cairo_move_to (cr,
2794                          dx + (radius - inset) * cos (i * G_PI / half),
2795                          dy + (radius - inset) * sin (i * G_PI / half));
2796           cairo_line_to (cr,
2797                          dx + radius * cos (i * G_PI / half),
2798                          dy + radius * sin (i * G_PI / half));
2799           cairo_stroke (cr);
2800
2801           cairo_restore (cr);
2802         }
2803
2804       cairo_restore (cr);
2805
2806       gdk_rgba_free (color);
2807     }
2808   else
2809     {
2810       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2811       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2812     }
2813 }
2814
2815 static GdkPixbuf *
2816 scale_or_ref (GdkPixbuf *src,
2817               gint       width,
2818               gint       height)
2819 {
2820   if (width == gdk_pixbuf_get_width (src) &&
2821       height == gdk_pixbuf_get_height (src))
2822     return g_object_ref (src);
2823   else
2824     return gdk_pixbuf_scale_simple (src,
2825                                     width, height,
2826                                     GDK_INTERP_BILINEAR);
2827 }
2828
2829 static gboolean
2830 lookup_icon_size (GtkThemingEngine *engine,
2831                   GtkIconSize       size,
2832                   gint             *width,
2833                   gint             *height)
2834 {
2835   GdkScreen *screen;
2836   GtkSettings *settings;
2837
2838   screen = gtk_theming_engine_get_screen (engine);
2839   settings = gtk_settings_get_for_screen (screen);
2840
2841   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
2842 }
2843
2844 static GdkPixbuf *
2845 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
2846                                        const GtkIconSource *source,
2847                                        GtkIconSize          size)
2848 {
2849   GdkPixbuf *scaled;
2850   GdkPixbuf *stated;
2851   GdkPixbuf *base_pixbuf;
2852   GtkStateFlags state;
2853   gint width = 1;
2854   gint height = 1;
2855
2856   base_pixbuf = gtk_icon_source_get_pixbuf (source);
2857   state = gtk_theming_engine_get_state (engine);
2858
2859   g_return_val_if_fail (base_pixbuf != NULL, NULL);
2860
2861   if (size != (GtkIconSize) -1 &&
2862       !lookup_icon_size (engine, size, &width, &height))
2863     {
2864       g_warning (G_STRLOC ": invalid icon size '%d'", size);
2865       return NULL;
2866     }
2867
2868   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
2869    * leave it alone.
2870    */
2871   if (size != (GtkIconSize) -1 &&
2872       gtk_icon_source_get_size_wildcarded (source))
2873     scaled = scale_or_ref (base_pixbuf, width, height);
2874   else
2875     scaled = g_object_ref (base_pixbuf);
2876
2877   /* If the state was wildcarded, then generate a state. */
2878   if (gtk_icon_source_get_state_wildcarded (source))
2879     {
2880       if (state & GTK_STATE_FLAG_INSENSITIVE)
2881         {
2882           stated = gdk_pixbuf_copy (scaled);
2883           gdk_pixbuf_saturate_and_pixelate (scaled, stated,
2884                                             0.8, TRUE);
2885           g_object_unref (scaled);
2886         }
2887       else if (state & GTK_STATE_FLAG_PRELIGHT)
2888         {
2889           stated = gdk_pixbuf_copy (scaled);
2890           gdk_pixbuf_saturate_and_pixelate (scaled, stated,
2891                                             1.2, FALSE);
2892           g_object_unref (scaled);
2893         }
2894       else
2895         stated = scaled;
2896     }
2897   else
2898     stated = scaled;
2899
2900   return stated;
2901 }