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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "config.h"
  19
  20 #include <math.h>
  21 #include <gtk/gtk.h>
  22
  23 #include <gtk/gtkthemingengine.h>
  24 #include <gtk/gtkstylecontext.h>
  25 #include <gtk/gtkintl.h>
  26
  27 #include "gtkprivate.h"
  28 #include "gtkmodulesprivate.h"
  29 #include "gtkborderimageprivate.h"
  30 #include "gtkpango.h"
  31 #include "gtkcssarrayvalueprivate.h"
  32 #include "gtkcssenumvalueprivate.h"
  33 #include "gtkcssnumbervalueprivate.h"
  34 #include "gtkcssrgbavalueprivate.h"
  35 #include "gtkcssshadowsvalueprivate.h"
  36 #include "gtkcsstypesprivate.h"
  37 #include "gtkthemingengineprivate.h"
  38 #include "gtkroundedboxprivate.h"
  39 #include "gtkthemingbackgroundprivate.h"
  40
  41 #include "fallback-c89.c"
  42
  43 /**
  44  * SECTION:gtkthemingengine
  45  * @Short_description: Theming renderers
  46  * @Title: GtkThemingEngine
  47  * @See_also: #GtkStyleContext
  48  *
  49  * #GtkThemingEngine is the object used for rendering themed content
  50  * in GTK+ widgets. Even though GTK+ has a default implementation,
  51  * it can be overridden in CSS files by enforcing a #GtkThemingEngine
  52  * object to be loaded as a module.
  53  *
  54  * In order to implement a theming engine, a #GtkThemingEngine subclass
  55  * must be created, alongside the CSS file that will reference it, the
  56  * theming engine would be created as an .so library, and installed in
  57  * $(gtk-modules-dir)/theming-engines/.
  58  *
  59  * #GtkThemingEngine<!-- -->s have limited access to the object they are
  60  * rendering, the #GtkThemingEngine API has read-only accessors to the
  61  * style information contained in the rendered object's #GtkStyleContext.
  62  */
  63
  64 enum {
  65   PROP_0,
  66   PROP_NAME
  67 };
  68
  69 struct GtkThemingEnginePrivate
  70 {
  71   GtkStyleContext *context;
  72   gchar *name;
  73 };
  74
  75 #define GTK_THEMING_ENGINE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_THEMING_ENGINE, GtkThemingEnginePrivate))
  76
  77 static void gtk_theming_engine_finalize          (GObject      *object);
  78 static void gtk_theming_engine_impl_set_property (GObject      *object,
  79                                                   guint         prop_id,
  80                                                   const GValue *value,
  81                                                   GParamSpec   *pspec);
  82 static void gtk_theming_engine_impl_get_property (GObject      *object,
  83                                                   guint         prop_id,
  84                                                   GValue       *value,
  85                                                   GParamSpec   *pspec);
  86
  87 static void gtk_theming_engine_render_check (GtkThemingEngine *engine,
  88                                              cairo_t          *cr,
  89                                              gdouble           x,
  90                                              gdouble           y,
  91                                              gdouble           width,
  92                                              gdouble           height);
  93 static void gtk_theming_engine_render_option (GtkThemingEngine *engine,
  94                                               cairo_t          *cr,
  95                                               gdouble           x,
  96                                               gdouble           y,
  97                                               gdouble           width,
  98                                               gdouble           height);
  99 static void gtk_theming_engine_render_arrow  (GtkThemingEngine *engine,
 100                                               cairo_t          *cr,
 101                                               gdouble           angle,
 102                                               gdouble           x,
 103                                               gdouble           y,
 104                                               gdouble           size);
 105 static void gtk_theming_engine_render_background (GtkThemingEngine *engine,
 106                                                   cairo_t          *cr,
 107                                                   gdouble           x,
 108                                                   gdouble           y,
 109                                                   gdouble           width,
 110                                                   gdouble           height);
 111 static void gtk_theming_engine_render_frame  (GtkThemingEngine *engine,
 112                                               cairo_t          *cr,
 113                                               gdouble           x,
 114                                               gdouble           y,
 115                                               gdouble           width,
 116                                               gdouble           height);
 117 static void gtk_theming_engine_render_expander (GtkThemingEngine *engine,
 118                                                 cairo_t          *cr,
 119                                                 gdouble           x,
 120                                                 gdouble           y,
 121                                                 gdouble           width,
 122                                                 gdouble           height);
 123 static void gtk_theming_engine_render_focus    (GtkThemingEngine *engine,
 124                                                 cairo_t          *cr,
 125                                                 gdouble           x,
 126                                                 gdouble           y,
 127                                                 gdouble           width,
 128                                                 gdouble           height);
 129 static void gtk_theming_engine_render_layout   (GtkThemingEngine *engine,
 130                                                 cairo_t          *cr,
 131                                                 gdouble           x,
 132                                                 gdouble           y,
 133                                                 PangoLayout      *layout);
 134 static void gtk_theming_engine_render_line     (GtkThemingEngine *engine,
 135                                                 cairo_t          *cr,
 136                                                 gdouble           x0,
 137                                                 gdouble           y0,
 138                                                 gdouble           x1,
 139                                                 gdouble           y1);
 140 static void gtk_theming_engine_render_slider   (GtkThemingEngine *engine,
 141                                                 cairo_t          *cr,
 142                                                 gdouble           x,
 143                                                 gdouble           y,
 144                                                 gdouble           width,
 145                                                 gdouble           height,
 146                                                 GtkOrientation    orientation);
 147 static void gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
 148                                                  cairo_t          *cr,
 149                                                  gdouble           x,
 150                                                  gdouble           y,
 151                                                  gdouble           width,
 152                                                  gdouble           height,
 153                                                  GtkPositionType   gap_side,
 154                                                  gdouble           xy0_gap,
 155                                                  gdouble           xy1_gap);
 156 static void gtk_theming_engine_render_extension (GtkThemingEngine *engine,
 157                                                  cairo_t          *cr,
 158                                                  gdouble           x,
 159                                                  gdouble           y,
 160                                                  gdouble           width,
 161                                                  gdouble           height,
 162                                                  GtkPositionType   gap_side);
 163 static void gtk_theming_engine_render_handle    (GtkThemingEngine *engine,
 164                                                  cairo_t          *cr,
 165                                                  gdouble           x,
 166                                                  gdouble           y,
 167                                                  gdouble           width,
 168                                                  gdouble           height);
 169 static void gtk_theming_engine_render_activity  (GtkThemingEngine *engine,
 170                                                  cairo_t          *cr,
 171                                                  gdouble           x,
 172                                                  gdouble           y,
 173                                                  gdouble           width,
 174                                                  gdouble           height);
 175 static GdkPixbuf * gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
 176                                                           const GtkIconSource *source,
 177                                                           GtkIconSize          size);
 178 static void gtk_theming_engine_render_icon (GtkThemingEngine *engine,
 179                                             cairo_t *cr,
 180                                             GdkPixbuf *pixbuf,
 181                                             gdouble x,
 182                                             gdouble y);
 183
 184 G_DEFINE_TYPE (GtkThemingEngine, gtk_theming_engine, G_TYPE_OBJECT)
 185
 186
 187 typedef struct GtkThemingModule GtkThemingModule;
 188 typedef struct GtkThemingModuleClass GtkThemingModuleClass;
 189
 190 struct GtkThemingModule
 191 {
 192   GTypeModule parent_instance;
 193   GModule *module;
 194   gchar *name;
 195
 196   void (*init) (GTypeModule *module);
 197   void (*exit) (void);
 198   GtkThemingEngine * (*create_engine) (void);
 199 };
 200
 201 struct GtkThemingModuleClass
 202 {
 203   GTypeModuleClass parent_class;
 204 };
 205
 206 #define GTK_TYPE_THEMING_MODULE  (gtk_theming_module_get_type ())
 207 #define GTK_THEMING_MODULE(o)    (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_THEMING_MODULE, GtkThemingModule))
 208 #define GTK_IS_THEMING_MODULE(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_THEMING_MODULE))
 209
 210 G_DEFINE_TYPE (GtkThemingModule, gtk_theming_module, G_TYPE_TYPE_MODULE);
 211
 212 static void
 213 gtk_theming_engine_class_init (GtkThemingEngineClass *klass)
 214 {
 215   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 216
 217   object_class->finalize = gtk_theming_engine_finalize;
 218   object_class->set_property = gtk_theming_engine_impl_set_property;
 219   object_class->get_property = gtk_theming_engine_impl_get_property;
 220
 221   klass->render_icon = gtk_theming_engine_render_icon;
 222   klass->render_check = gtk_theming_engine_render_check;
 223   klass->render_option = gtk_theming_engine_render_option;
 224   klass->render_arrow = gtk_theming_engine_render_arrow;
 225   klass->render_background = gtk_theming_engine_render_background;
 226   klass->render_frame = gtk_theming_engine_render_frame;
 227   klass->render_expander = gtk_theming_engine_render_expander;
 228   klass->render_focus = gtk_theming_engine_render_focus;
 229   klass->render_layout = gtk_theming_engine_render_layout;
 230   klass->render_line = gtk_theming_engine_render_line;
 231   klass->render_slider = gtk_theming_engine_render_slider;
 232   klass->render_frame_gap = gtk_theming_engine_render_frame_gap;
 233   klass->render_extension = gtk_theming_engine_render_extension;
 234   klass->render_handle = gtk_theming_engine_render_handle;
 235   klass->render_activity = gtk_theming_engine_render_activity;
 236   klass->render_icon_pixbuf = gtk_theming_engine_render_icon_pixbuf;
 237
 238   /**
 239    * GtkThemingEngine:name:
 240    *
 241    * The theming engine name, this name will be used when registering
 242    * custom properties, for a theming engine named "Clearlooks" registering
 243    * a "glossy" custom property, it could be referenced in the CSS file as
 244    *
 245    * <programlisting>
 246    * -Clearlooks-glossy: true;
 247    * </programlisting>
 248    *
 249    * Since: 3.0
 250    */
 251   g_object_class_install_property (object_class,
 252                                    PROP_NAME,
 253                                    g_param_spec_string ("name",
 254                                                         P_("Name"),
 255                                                         P_("Theming engine name"),
 256                                                         NULL,
 257                                                         G_PARAM_CONSTRUCT_ONLY | GTK_PARAM_READWRITE));
 258
 259   g_type_class_add_private (object_class, sizeof (GtkThemingEnginePrivate));
 260 }
 261
 262 static void
 263 gtk_theming_engine_init (GtkThemingEngine *engine)
 264 {
 265   engine->priv = GTK_THEMING_ENGINE_GET_PRIVATE (engine);
 266 }
 267
 268 static void
 269 gtk_theming_engine_finalize (GObject *object)
 270 {
 271   GtkThemingEnginePrivate *priv;
 272
 273   priv = GTK_THEMING_ENGINE (object)->priv;
 274   g_free (priv->name);
 275
 276   G_OBJECT_GET_CLASS (gtk_theming_engine_parent_class)->finalize (object);
 277 }
 278
 279 static void
 280 gtk_theming_engine_impl_set_property (GObject      *object,
 281                                       guint         prop_id,
 282                                       const GValue *value,
 283                                       GParamSpec   *pspec)
 284 {
 285   GtkThemingEnginePrivate *priv;
 286
 287   priv = GTK_THEMING_ENGINE (object)->priv;
 288
 289   switch (prop_id)
 290     {
 291     case PROP_NAME:
 292       if (priv->name)
 293         g_free (priv->name);
 294
 295       priv->name = g_value_dup_string (value);
 296       break;
 297     default:
 298       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 299       break;
 300     }
 301 }
 302
 303 static void
 304 gtk_theming_engine_impl_get_property (GObject    *object,
 305                                       guint       prop_id,
 306                                       GValue     *value,
 307                                       GParamSpec *pspec)
 308 {
 309   GtkThemingEnginePrivate *priv;
 310
 311   priv = GTK_THEMING_ENGINE (object)->priv;
 312
 313   switch (prop_id)
 314     {
 315     case PROP_NAME:
 316       g_value_set_string (value, priv->name);
 317       break;
 318     default:
 319       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 320       break;
 321     }
 322 }
 323
 324 void
 325 _gtk_theming_engine_set_context (GtkThemingEngine *engine,
 326                                  GtkStyleContext  *context)
 327 {
 328   GtkThemingEnginePrivate *priv;
 329
 330   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 331   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
 332
 333   priv = engine->priv;
 334   priv->context = context;
 335 }
 336
 337 GtkStyleContext *
 338 _gtk_theming_engine_get_context (GtkThemingEngine *engine)
 339 {
 340   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 341
 342   return engine->priv->context;
 343 }
 344
 345 GtkCssValue *
 346 _gtk_theming_engine_peek_property (GtkThemingEngine *engine,
 347                                    guint             property_id)
 348 {
 349   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 350
 351   return _gtk_style_context_peek_property (engine->priv->context, property_id);
 352 }
 353
 354 double
 355 _gtk_theming_engine_get_number (GtkThemingEngine *engine,
 356                                 guint             property_id,
 357                                 double            one_hundred_percent)
 358 {
 359   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0.0);
 360
 361   return _gtk_style_context_get_number (engine->priv->context, property_id, one_hundred_percent);
 362 }
 363
 364 /**
 365  * gtk_theming_engine_get_property:
 366  * @engine: a #GtkThemingEngine
 367  * @property: the property name
 368  * @state: state to retrieve the value for
 369  * @value: (out) (transfer full): return location for the property value,
 370  *         you must free this memory using g_value_unset() once you are
 371  *         done with it.
 372  *
 373  * Gets a property value as retrieved from the style settings that apply
 374  * to the currently rendered element.
 375  *
 376  * Since: 3.0
 377  **/
 378 void
 379 gtk_theming_engine_get_property (GtkThemingEngine *engine,
 380                                  const gchar      *property,
 381                                  GtkStateFlags     state,
 382                                  GValue           *value)
 383 {
 384   GtkThemingEnginePrivate *priv;
 385
 386   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 387   g_return_if_fail (property != NULL);
 388   g_return_if_fail (value != NULL);
 389
 390   priv = engine->priv;
 391   gtk_style_context_get_property (priv->context, property, state, value);
 392 }
 393
 394 /**
 395  * gtk_theming_engine_get_valist:
 396  * @engine: a #GtkThemingEngine
 397  * @state: state to retrieve values for
 398  * @args: va_list of property name/return location pairs, followed by %NULL
 399  *
 400  * Retrieves several style property values that apply to the currently
 401  * rendered element.
 402  *
 403  * Since: 3.0
 404  **/
 405 void
 406 gtk_theming_engine_get_valist (GtkThemingEngine *engine,
 407                                GtkStateFlags     state,
 408                                va_list           args)
 409 {
 410   GtkThemingEnginePrivate *priv;
 411
 412   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 413
 414   priv = engine->priv;
 415   gtk_style_context_get_valist (priv->context, state, args);
 416 }
 417
 418 /**
 419  * gtk_theming_engine_get:
 420  * @engine: a #GtkThemingEngine
 421  * @state: state to retrieve values for
 422  * @...: property name /return value pairs, followed by %NULL
 423  *
 424  * Retrieves several style property values that apply to the currently
 425  * rendered element.
 426  *
 427  * Since: 3.0
 428  **/
 429 void
 430 gtk_theming_engine_get (GtkThemingEngine *engine,
 431                         GtkStateFlags     state,
 432                         ...)
 433 {
 434   GtkThemingEnginePrivate *priv;
 435   va_list args;
 436
 437   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 438
 439   priv = engine->priv;
 440
 441   va_start (args, state);
 442   gtk_style_context_get_valist (priv->context, state, args);
 443   va_end (args);
 444 }
 445
 446 /**
 447  * gtk_theming_engine_get_style_property:
 448  * @engine: a #GtkThemingEngine
 449  * @property_name: the name of the widget style property
 450  * @value: Return location for the property value, free with
 451  *         g_value_unset() after use.
 452  *
 453  * Gets the value for a widget style property.
 454  *
 455  * Since: 3.0
 456  **/
 457 void
 458 gtk_theming_engine_get_style_property (GtkThemingEngine *engine,
 459                                        const gchar      *property_name,
 460                                        GValue           *value)
 461 {
 462   GtkThemingEnginePrivate *priv;
 463
 464   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 465   g_return_if_fail (property_name != NULL);
 466
 467   priv = engine->priv;
 468   gtk_style_context_get_style_property (priv->context, property_name, value);
 469 }
 470
 471 /**
 472  * gtk_theming_engine_get_style_valist:
 473  * @engine: a #GtkThemingEngine
 474  * @args: va_list of property name/return location pairs, followed by %NULL
 475  *
 476  * Retrieves several widget style properties from @engine according to the
 477  * currently rendered content's style.
 478  *
 479  * Since: 3.0
 480  **/
 481 void
 482 gtk_theming_engine_get_style_valist (GtkThemingEngine *engine,
 483                                      va_list           args)
 484 {
 485   GtkThemingEnginePrivate *priv;
 486
 487   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 488
 489   priv = engine->priv;
 490   gtk_style_context_get_style_valist (priv->context, args);
 491 }
 492
 493 /**
 494  * gtk_theming_engine_get_style:
 495  * @engine: a #GtkThemingEngine
 496  * @...: property name /return value pairs, followed by %NULL
 497  *
 498  * Retrieves several widget style properties from @engine according
 499  * to the currently rendered content's style.
 500  *
 501  * Since: 3.0
 502  **/
 503 void
 504 gtk_theming_engine_get_style (GtkThemingEngine *engine,
 505                               ...)
 506 {
 507   GtkThemingEnginePrivate *priv;
 508   va_list args;
 509
 510   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 511
 512   priv = engine->priv;
 513
 514   va_start (args, engine);
 515   gtk_style_context_get_style_valist (priv->context, args);
 516   va_end (args);
 517 }
 518
 519 /**
 520  * gtk_theming_engine_lookup_color:
 521  * @engine: a #GtkThemingEngine
 522  * @color_name: color name to lookup
 523  * @color: (out): Return location for the looked up color
 524  *
 525  * Looks up and resolves a color name in the current style's color map.
 526  *
 527  * Returns: %TRUE if @color_name was found and resolved, %FALSE otherwise
 528  **/
 529 gboolean
 530 gtk_theming_engine_lookup_color (GtkThemingEngine *engine,
 531                                  const gchar      *color_name,
 532                                  GdkRGBA          *color)
 533 {
 534   GtkThemingEnginePrivate *priv;
 535
 536   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 537   g_return_val_if_fail (color_name != NULL, FALSE);
 538
 539   priv = engine->priv;
 540   return gtk_style_context_lookup_color (priv->context, color_name, color);
 541 }
 542
 543 /**
 544  * gtk_theming_engine_get_state:
 545  * @engine: a #GtkThemingEngine
 546  *
 547  * returns the state used when rendering.
 548  *
 549  * Returns: the state flags
 550  *
 551  * Since: 3.0
 552  **/
 553 GtkStateFlags
 554 gtk_theming_engine_get_state (GtkThemingEngine *engine)
 555 {
 556   GtkThemingEnginePrivate *priv;
 557
 558   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 559
 560   priv = engine->priv;
 561   return gtk_style_context_get_state (priv->context);
 562 }
 563
 564 /**
 565  * gtk_theming_engine_state_is_running:
 566  * @engine: a #GtkThemingEngine
 567  * @state: a widget state
 568  * @progress: (out): return location for the transition progress
 569  *
 570  * Returns %TRUE if there is a transition animation running for the
 571  * current region (see gtk_style_context_push_animatable_region()).
 572  *
 573  * If @progress is not %NULL, the animation progress will be returned
 574  * there, 0.0 means the state is closest to being %FALSE, while 1.0 means
 575  * it's closest to being %TRUE. This means transition animations will
 576  * run from 0 to 1 when @state is being set to %TRUE and from 1 to 0 when
 577  * it's being set to %FALSE.
 578  *
 579  * Returns: %TRUE if there is a running transition animation for @state.
 580  *
 581  * Since: 3.0
 582  **/
 583 gboolean
 584 gtk_theming_engine_state_is_running (GtkThemingEngine *engine,
 585                                      GtkStateType      state,
 586                                      gdouble          *progress)
 587 {
 588   GtkThemingEnginePrivate *priv;
 589
 590   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 591
 592   priv = engine->priv;
 593   return gtk_style_context_state_is_running (priv->context, state, progress);
 594 }
 595
 596 /**
 597  * gtk_theming_engine_get_path:
 598  * @engine: a #GtkThemingEngine
 599  *
 600  * Returns the widget path used for style matching.
 601  *
 602  * Returns: (transfer none): A #GtkWidgetPath
 603  *
 604  * Since: 3.0
 605  **/
 606 const GtkWidgetPath *
 607 gtk_theming_engine_get_path (GtkThemingEngine *engine)
 608 {
 609   GtkThemingEnginePrivate *priv;
 610
 611   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 612
 613   priv = engine->priv;
 614   return gtk_style_context_get_path (priv->context);
 615 }
 616
 617 /**
 618  * gtk_theming_engine_has_class:
 619  * @engine: a #GtkThemingEngine
 620  * @style_class: class name to look up
 621  *
 622  * Returns %TRUE if the currently rendered contents have
 623  * defined the given class name.
 624  *
 625  * Returns: %TRUE if @engine has @class_name defined
 626  *
 627  * Since: 3.0
 628  **/
 629 gboolean
 630 gtk_theming_engine_has_class (GtkThemingEngine *engine,
 631                               const gchar      *style_class)
 632 {
 633   GtkThemingEnginePrivate *priv;
 634
 635   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 636
 637   priv = engine->priv;
 638   return gtk_style_context_has_class (priv->context, style_class);
 639 }
 640
 641 /**
 642  * gtk_theming_engine_has_region:
 643  * @engine: a #GtkThemingEngine
 644  * @style_region: a region name
 645  * @flags: (out) (allow-none): return location for region flags
 646  *
 647  * Returns %TRUE if the currently rendered contents have the
 648  * region defined. If @flags_return is not %NULL, it is set
 649  * to the flags affecting the region.
 650  *
 651  * Returns: %TRUE if region is defined
 652  *
 653  * Since: 3.0
 654  **/
 655 gboolean
 656 gtk_theming_engine_has_region (GtkThemingEngine *engine,
 657                                const gchar      *style_region,
 658                                GtkRegionFlags   *flags)
 659 {
 660   GtkThemingEnginePrivate *priv;
 661
 662   if (flags)
 663     *flags = 0;
 664
 665   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 666
 667   priv = engine->priv;
 668   return gtk_style_context_has_region (priv->context, style_region, flags);
 669 }
 670
 671 /**
 672  * gtk_theming_engine_get_direction:
 673  * @engine: a #GtkThemingEngine
 674  *
 675  * Returns the widget direction used for rendering.
 676  *
 677  * Returns: the widget direction
 678  *
 679  * Since: 3.0
 680  **/
 681 GtkTextDirection
 682 gtk_theming_engine_get_direction (GtkThemingEngine *engine)
 683 {
 684   GtkThemingEnginePrivate *priv;
 685
 686   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), GTK_TEXT_DIR_LTR);
 687
 688   priv = engine->priv;
 689   return gtk_style_context_get_direction (priv->context);
 690 }
 691
 692 /**
 693  * gtk_theming_engine_get_junction_sides:
 694  * @engine: a #GtkThemingEngine
 695  *
 696  * Returns the widget direction used for rendering.
 697  *
 698  * Returns: the widget direction
 699  *
 700  * Since: 3.0
 701  **/
 702 GtkJunctionSides
 703 gtk_theming_engine_get_junction_sides (GtkThemingEngine *engine)
 704 {
 705   GtkThemingEnginePrivate *priv;
 706
 707   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 708
 709   priv = engine->priv;
 710   return gtk_style_context_get_junction_sides (priv->context);
 711 }
 712
 713 /**
 714  * gtk_theming_engine_get_color:
 715  * @engine: a #GtkThemingEngine
 716  * @state: state to retrieve the color for
 717  * @color: (out): return value for the foreground color
 718  *
 719  * Gets the foreground color for a given state.
 720  *
 721  * Since: 3.0
 722  **/
 723 void
 724 gtk_theming_engine_get_color (GtkThemingEngine *engine,
 725                               GtkStateFlags     state,
 726                               GdkRGBA          *color)
 727 {
 728   GtkThemingEnginePrivate *priv;
 729
 730   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 731
 732   priv = engine->priv;
 733   gtk_style_context_get_color (priv->context, state, color);
 734 }
 735
 736 /**
 737  * gtk_theming_engine_get_background_color:
 738  * @engine: a #GtkThemingEngine
 739  * @state: state to retrieve the color for
 740  * @color: (out): return value for the background color
 741  *
 742  * Gets the background color for a given state.
 743  *
 744  * Since: 3.0
 745  **/
 746 void
 747 gtk_theming_engine_get_background_color (GtkThemingEngine *engine,
 748                                          GtkStateFlags     state,
 749                                          GdkRGBA          *color)
 750 {
 751   GtkThemingEnginePrivate *priv;
 752
 753   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 754
 755   priv = engine->priv;
 756   gtk_style_context_get_background_color (priv->context, state, color);
 757 }
 758
 759 /**
 760  * gtk_theming_engine_get_border_color:
 761  * @engine: a #GtkThemingEngine
 762  * @state: state to retrieve the color for
 763  * @color: (out): return value for the border color
 764  *
 765  * Gets the border color for a given state.
 766  *
 767  * Since: 3.0
 768  **/
 769 void
 770 gtk_theming_engine_get_border_color (GtkThemingEngine *engine,
 771                                      GtkStateFlags     state,
 772                                      GdkRGBA          *color)
 773 {
 774   GtkThemingEnginePrivate *priv;
 775
 776   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 777
 778   priv = engine->priv;
 779   gtk_style_context_get_border_color (priv->context, state, color);
 780 }
 781
 782 /**
 783  * gtk_theming_engine_get_border:
 784  * @engine: a #GtkthemingEngine
 785  * @state: state to retrieve the border for
 786  * @border: (out): return value for the border settings
 787  *
 788  * Gets the border for a given state as a #GtkBorder.
 789  *
 790  * Since: 3.0
 791  **/
 792 void
 793 gtk_theming_engine_get_border (GtkThemingEngine *engine,
 794                                GtkStateFlags     state,
 795                                GtkBorder        *border)
 796 {
 797   GtkThemingEnginePrivate *priv;
 798
 799   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 800
 801   priv = engine->priv;
 802   gtk_style_context_get_border (priv->context, state, border);
 803 }
 804
 805 /**
 806  * gtk_theming_engine_get_padding:
 807  * @engine: a #GtkthemingEngine
 808  * @state: state to retrieve the padding for
 809  * @padding: (out): return value for the padding settings
 810  *
 811  * Gets the padding for a given state as a #GtkBorder.
 812  *
 813  * Since: 3.0
 814  **/
 815 void
 816 gtk_theming_engine_get_padding (GtkThemingEngine *engine,
 817                                 GtkStateFlags     state,
 818                                 GtkBorder        *padding)
 819 {
 820   GtkThemingEnginePrivate *priv;
 821
 822   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 823
 824   priv = engine->priv;
 825   gtk_style_context_get_padding (priv->context, state, padding);
 826 }
 827
 828 /**
 829  * gtk_theming_engine_get_margin:
 830  * @engine: a #GtkThemingEngine
 831  * @state: state to retrieve the border for
 832  * @margin: (out): return value for the margin settings
 833  *
 834  * Gets the margin for a given state as a #GtkBorder.
 835  *
 836  * Since: 3.0
 837  **/
 838 void
 839 gtk_theming_engine_get_margin (GtkThemingEngine *engine,
 840                                GtkStateFlags     state,
 841                                GtkBorder        *margin)
 842 {
 843   GtkThemingEnginePrivate *priv;
 844
 845   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 846
 847   priv = engine->priv;
 848   gtk_style_context_get_margin (priv->context, state, margin);
 849 }
 850
 851 /**
 852  * gtk_theming_engine_get_font:
 853  * @engine: a #GtkThemingEngine
 854  * @state: state to retrieve the font for
 855  *
 856  * Returns the font description for a given state.
 857  *
 858  * Returns: (transfer none): the #PangoFontDescription for the given
 859  *          state. This object is owned by GTK+ and should not be
 860  *          freed.
 861  *
 862  * Since: 3.0
 863  **/
 864 const PangoFontDescription *
 865 gtk_theming_engine_get_font (GtkThemingEngine *engine,
 866                              GtkStateFlags     state)
 867 {
 868   GtkThemingEnginePrivate *priv;
 869
 870   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 871
 872   priv = engine->priv;
 873   return gtk_style_context_get_font (priv->context, state);
 874 }
 875
 876 /* GtkThemingModule */
 877
 878 static gboolean
 879 gtk_theming_module_load (GTypeModule *type_module)
 880 {
 881   GtkThemingModule *theming_module;
 882   GModule *module;
 883   gchar *name, *module_path;
 884
 885   theming_module = GTK_THEMING_MODULE (type_module);
 886   name = theming_module->name;
 887   module_path = _gtk_find_module (name, "theming-engines");
 888
 889   if (!module_path)
 890     return FALSE;
 891
 892   module = g_module_open (module_path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 893   g_free (module_path);
 894
 895   if (!module)
 896     return FALSE;
 897
 898   if (!g_module_symbol (module, "theme_init",
 899                         (gpointer *) &theming_module->init) ||
 900       !g_module_symbol (module, "theme_exit",
 901                         (gpointer *) &theming_module->exit) ||
 902       !g_module_symbol (module, "create_engine",
 903                         (gpointer *) &theming_module->create_engine))
 904     {
 905       g_module_close (module);
 906
 907       return FALSE;
 908     }
 909
 910   theming_module->module = module;
 911
 912   theming_module->init (G_TYPE_MODULE (theming_module));
 913
 914   return TRUE;
 915 }
 916
 917 static void
 918 gtk_theming_module_unload (GTypeModule *type_module)
 919 {
 920   GtkThemingModule *theming_module;
 921
 922   theming_module = GTK_THEMING_MODULE (type_module);
 923
 924   theming_module->exit ();
 925
 926   g_module_close (theming_module->module);
 927
 928   theming_module->module = NULL;
 929   theming_module->init = NULL;
 930   theming_module->exit = NULL;
 931   theming_module->create_engine = NULL;
 932 }
 933
 934 static void
 935 gtk_theming_module_class_init (GtkThemingModuleClass *klass)
 936 {
 937   GTypeModuleClass *module_class = G_TYPE_MODULE_CLASS (klass);
 938
 939   module_class->load = gtk_theming_module_load;
 940   module_class->unload = gtk_theming_module_unload;
 941 }
 942
 943 static void
 944 gtk_theming_module_init (GtkThemingModule *module)
 945 {
 946 }
 947
 948 /**
 949  * gtk_theming_engine_load:
 950  * @name: Theme engine name to load
 951  *
 952  * Loads and initializes a theming engine module from the
 953  * standard directories.
 954  *
 955  * Returns: (transfer none): A theming engine, or %NULL if
 956  * the engine @name doesn't exist.
 957  **/
 958 GtkThemingEngine *
 959 gtk_theming_engine_load (const gchar *name)
 960 {
 961   static GHashTable *engines = NULL;
 962   static GtkThemingEngine *default_engine;
 963   GtkThemingEngine *engine = NULL;
 964
 965   if (name)
 966     {
 967       if (!engines)
 968         engines = g_hash_table_new (g_str_hash, g_str_equal);
 969
 970       engine = g_hash_table_lookup (engines, name);
 971
 972       if (!engine)
 973         {
 974           GtkThemingModule *module;
 975
 976           module = g_object_new (GTK_TYPE_THEMING_MODULE, NULL);
 977           g_type_module_set_name (G_TYPE_MODULE (module), name);
 978           module->name = g_strdup (name);
 979
 980           if (module && g_type_module_use (G_TYPE_MODULE (module)))
 981             {
 982               engine = (module->create_engine) ();
 983
 984               if (engine)
 985                 g_hash_table_insert (engines, module->name, engine);
 986             }
 987         }
 988     }
 989   else
 990     {
 991       if (G_UNLIKELY (!default_engine))
 992         default_engine = g_object_new (GTK_TYPE_THEMING_ENGINE, NULL);
 993
 994       engine = default_engine;
 995     }
 996
 997   return engine;
 998 }
 999
1000 /**
1001  * gtk_theming_engine_get_screen:
1002  * @engine: a #GtkThemingEngine
1003  *
1004  * Returns the #GdkScreen to which @engine currently rendering to.
1005  *
1006  * Returns: (transfer none): a #GdkScreen, or %NULL.
1007  **/
1008 GdkScreen *
1009 gtk_theming_engine_get_screen (GtkThemingEngine *engine)
1010 {
1011   GtkThemingEnginePrivate *priv;
1012
1013   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
1014
1015   priv = engine->priv;
1016   return gtk_style_context_get_screen (priv->context);
1017 }
1018
1019 /* Paint method implementations */
1020 static void
1021 gtk_theming_engine_render_check (GtkThemingEngine *engine,
1022                                  cairo_t          *cr,
1023                                  gdouble           x,
1024                                  gdouble           y,
1025                                  gdouble           width,
1026                                  gdouble           height)
1027 {
1028   GdkRGBA fg_color, bg_color;
1029   GtkStateFlags flags;
1030   gint exterior_size, interior_size, thickness, pad;
1031   GtkBorderStyle border_style;
1032   GtkBorder border;
1033   gint border_width;
1034   GtkThemingBackground bg;
1035
1036   _gtk_theming_background_init (&bg, engine,
1037                                 x, y,
1038                                 width, height,
1039                                 gtk_theming_engine_get_junction_sides (engine));
1040
1041   if (_gtk_theming_background_has_background_image (&bg))
1042     {
1043       _gtk_theming_background_render (&bg, cr);
1044       return;
1045     }
1046
1047   flags = gtk_theming_engine_get_state (engine);
1048   cairo_save (cr);
1049
1050   gtk_theming_engine_get_color (engine, flags, &fg_color);
1051   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1052   gtk_theming_engine_get_border (engine, flags, &border);
1053
1054   gtk_theming_engine_get (engine, flags,
1055                           "border-style", &border_style,
1056                           NULL);
1057
1058   border_width = MIN (MIN (border.top, border.bottom),
1059                       MIN (border.left, border.right));
1060   exterior_size = MIN (width, height);
1061
1062   if (exterior_size % 2 == 0) /* Ensure odd */
1063     exterior_size -= 1;
1064
1065   /* FIXME: thickness */
1066   thickness = 1;
1067   pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1068   interior_size = MAX (1, exterior_size - 2 * pad);
1069
1070   if (interior_size < 7)
1071     {
1072       interior_size = 7;
1073       pad = MAX (0, (exterior_size - interior_size) / 2);
1074     }
1075
1076   x -= (1 + exterior_size - (gint) width) / 2;
1077   y -= (1 + exterior_size - (gint) height) / 2;
1078
1079   if (border_style == GTK_BORDER_STYLE_SOLID)
1080     {
1081       GdkRGBA border_color;
1082
1083       cairo_set_line_width (cr, border_width);
1084       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1085
1086       cairo_rectangle (cr, x + 0.5, y + 0.5, exterior_size - 1, exterior_size - 1);
1087       gdk_cairo_set_source_rgba (cr, &bg_color);
1088       cairo_fill_preserve (cr);
1089
1090       gdk_cairo_set_source_rgba (cr, &border_color);
1091       cairo_stroke (cr);
1092     }
1093
1094   gdk_cairo_set_source_rgba (cr, &fg_color);
1095
1096   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1097     {
1098       int line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1099
1100       cairo_rectangle (cr,
1101                        x + pad,
1102                        y + pad + (1 + interior_size - line_thickness) / 2,
1103                        interior_size,
1104                        line_thickness);
1105       cairo_fill (cr);
1106     }
1107   else
1108     {
1109       gdouble progress;
1110       gboolean running;
1111
1112       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1113
1114       if ((flags & GTK_STATE_FLAG_ACTIVE) || running)
1115         {
1116           if (!running)
1117             progress = 1;
1118
1119           cairo_translate (cr,
1120                            x + pad, y + pad);
1121
1122           cairo_scale (cr, interior_size / 7., interior_size / 7.);
1123
1124           cairo_rectangle (cr, 0, 0, 7 * progress, 7);
1125           cairo_clip (cr);
1126
1127           cairo_move_to  (cr, 7.0, 0.0);
1128           cairo_line_to  (cr, 7.5, 1.0);
1129           cairo_curve_to (cr, 5.3, 2.0,
1130                           4.3, 4.0,
1131                           3.5, 7.0);
1132           cairo_curve_to (cr, 3.0, 5.7,
1133                           1.3, 4.7,
1134                           0.0, 4.7);
1135           cairo_line_to  (cr, 0.2, 3.5);
1136           cairo_curve_to (cr, 1.1, 3.5,
1137                           2.3, 4.3,
1138                           3.0, 5.0);
1139           cairo_curve_to (cr, 1.0, 3.9,
1140                           2.4, 4.1,
1141                           3.2, 4.9);
1142           cairo_curve_to (cr, 3.5, 3.1,
1143                           5.2, 2.0,
1144                           7.0, 0.0);
1145
1146           cairo_fill (cr);
1147         }
1148     }
1149
1150   cairo_restore (cr);
1151 }
1152
1153 static void
1154 gtk_theming_engine_render_option (GtkThemingEngine *engine,
1155                                   cairo_t          *cr,
1156                                   gdouble           x,
1157                                   gdouble           y,
1158                                   gdouble           width,
1159                                   gdouble           height)
1160 {
1161   GtkStateFlags flags;
1162   GdkRGBA fg_color, bg_color;
1163   gint exterior_size, interior_size, pad, thickness, border_width;
1164   GtkBorderStyle border_style;
1165   GtkBorder border;
1166   GtkThemingBackground bg;
1167
1168   _gtk_theming_background_init (&bg, engine,
1169                                 x, y,
1170                                 width, height,
1171                                 gtk_theming_engine_get_junction_sides (engine));
1172
1173   if (_gtk_theming_background_has_background_image (&bg))
1174     {
1175       _gtk_theming_background_render (&bg, cr);
1176       return;
1177     }
1178
1179   flags = gtk_theming_engine_get_state (engine);
1180
1181   cairo_save (cr);
1182
1183   gtk_theming_engine_get_color (engine, flags, &fg_color);
1184   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1185   gtk_theming_engine_get_border (engine, flags, &border);
1186
1187   gtk_theming_engine_get (engine, flags,
1188                           "border-style", &border_style,
1189                           NULL);
1190
1191   exterior_size = MIN (width, height);
1192   border_width = MIN (MIN (border.top, border.bottom),
1193                       MIN (border.left, border.right));
1194
1195   if (exterior_size % 2 == 0) /* Ensure odd */
1196     exterior_size -= 1;
1197
1198   x -= (1 + exterior_size - width) / 2;
1199   y -= (1 + exterior_size - height) / 2;
1200
1201   if (border_style == GTK_BORDER_STYLE_SOLID)
1202     {
1203       GdkRGBA border_color;
1204
1205       cairo_set_line_width (cr, border_width);
1206       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1207
1208       cairo_new_sub_path (cr);
1209       cairo_arc (cr,
1210                  x + exterior_size / 2.,
1211                  y + exterior_size / 2.,
1212                  (exterior_size - 1) / 2.,
1213                  0, 2 * G_PI);
1214
1215       gdk_cairo_set_source_rgba (cr, &bg_color);
1216       cairo_fill_preserve (cr);
1217
1218       gdk_cairo_set_source_rgba (cr, &border_color);
1219       cairo_stroke (cr);
1220     }
1221
1222   gdk_cairo_set_source_rgba (cr, &fg_color);
1223
1224   /* FIXME: thickness */
1225   thickness = 1;
1226
1227   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1228     {
1229       gint line_thickness;
1230
1231       pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1232       interior_size = MAX (1, exterior_size - 2 * pad);
1233
1234       if (interior_size < 7)
1235         {
1236           interior_size = 7;
1237           pad = MAX (0, (exterior_size - interior_size) / 2);
1238         }
1239
1240       line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1241
1242       cairo_rectangle (cr,
1243                        x + pad,
1244                        y + pad + (interior_size - line_thickness) / 2.,
1245                        interior_size,
1246                        line_thickness);
1247       cairo_fill (cr);
1248     }
1249   if (flags & GTK_STATE_FLAG_ACTIVE)
1250     {
1251       pad = thickness + MAX (1, 2 * (exterior_size - 2 * thickness) / 9);
1252       interior_size = MAX (1, exterior_size - 2 * pad);
1253
1254       if (interior_size < 5)
1255         {
1256           interior_size = 7;
1257           pad = MAX (0, (exterior_size - interior_size) / 2);
1258         }
1259
1260       cairo_new_sub_path (cr);
1261       cairo_arc (cr,
1262                  x + pad + interior_size / 2.,
1263                  y + pad + interior_size / 2.,
1264                  interior_size / 2.,
1265                  0, 2 * G_PI);
1266       cairo_fill (cr);
1267     }
1268
1269   cairo_restore (cr);
1270 }
1271
1272 static void
1273 add_path_arrow (cairo_t *cr,
1274                 gdouble  angle,
1275                 gdouble  x,
1276                 gdouble  y,
1277                 gdouble  size)
1278 {
1279   cairo_save (cr);
1280
1281   cairo_translate (cr, x + (size / 2), y + (size / 2));
1282   cairo_rotate (cr, angle);
1283
1284   cairo_move_to (cr, 0, - (size / 4));
1285   cairo_line_to (cr, - (size / 2), (size / 4));
1286   cairo_line_to (cr, (size / 2), (size / 4));
1287   cairo_close_path (cr);
1288
1289   cairo_restore (cr);
1290 }
1291
1292 static void
1293 gtk_theming_engine_render_arrow (GtkThemingEngine *engine,
1294                                  cairo_t          *cr,
1295                                  gdouble           angle,
1296                                  gdouble           x,
1297                                  gdouble           y,
1298                                  gdouble           size)
1299 {
1300   GtkStateFlags flags;
1301   GdkRGBA fg_color;
1302
1303   cairo_save (cr);
1304
1305   flags = gtk_theming_engine_get_state (engine);
1306   gtk_theming_engine_get_color (engine, flags, &fg_color);
1307
1308   if (flags & GTK_STATE_FLAG_INSENSITIVE)
1309     {
1310       add_path_arrow (cr, angle, x + 1, y + 1, size);
1311       cairo_set_source_rgb (cr, 1, 1, 1);
1312       cairo_fill (cr);
1313     }
1314
1315   add_path_arrow (cr, angle, x, y, size);
1316   gdk_cairo_set_source_rgba (cr, &fg_color);
1317   cairo_fill (cr);
1318
1319   cairo_restore (cr);
1320 }
1321
1322 static void
1323 add_path_line (cairo_t        *cr,
1324                gdouble         x1,
1325                gdouble         y1,
1326                gdouble         x2,
1327                gdouble         y2)
1328 {
1329   /* Adjust endpoints */
1330   if (y1 == y2)
1331     {
1332       y1 += 0.5;
1333       y2 += 0.5;
1334       x2 += 1;
1335     }
1336   else if (x1 == x2)
1337     {
1338       x1 += 0.5;
1339       x2 += 0.5;
1340       y2 += 1;
1341     }
1342
1343   cairo_move_to (cr, x1, y1);
1344   cairo_line_to (cr, x2, y2);
1345 }
1346
1347 static void
1348 color_shade (const GdkRGBA *color,
1349              gdouble        factor,
1350              GdkRGBA       *color_return)
1351 {
1352   GtkSymbolicColor *literal, *shade;
1353
1354   literal = gtk_symbolic_color_new_literal (color);
1355   shade = gtk_symbolic_color_new_shade (literal, factor);
1356   gtk_symbolic_color_unref (literal);
1357
1358   gtk_symbolic_color_resolve (shade, NULL, color_return);
1359   gtk_symbolic_color_unref (shade);
1360 }
1361
1362 static void
1363 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1364                                       cairo_t          *cr,
1365                                       gdouble           x,
1366                                       gdouble           y,
1367                                       gdouble           width,
1368                                       gdouble           height)
1369 {
1370   GtkThemingBackground bg;
1371
1372   _gtk_theming_background_init (&bg, engine,
1373                                 x, y,
1374                                 width, height,
1375                                 gtk_theming_engine_get_junction_sides (engine));
1376
1377   _gtk_theming_background_render (&bg, cr);
1378 }
1379
1380 static void
1381 gtk_theming_engine_hide_border_sides (GtkBorder *border,
1382                                       guint      hidden_side)
1383 {
1384   if (hidden_side & (1 << GTK_CSS_TOP))
1385     border->top = 0;
1386   if (hidden_side & (1 << GTK_CSS_RIGHT))
1387     border->right = 0;
1388   if (hidden_side & (1 << GTK_CSS_BOTTOM))
1389     border->bottom = 0;
1390   if (hidden_side & (1 << GTK_CSS_LEFT))
1391     border->left = 0;
1392 }
1393
1394 static void
1395 render_frame_fill (cairo_t       *cr,
1396                    GtkRoundedBox *border_box,
1397                    GtkBorder     *border,
1398                    GdkRGBA        colors[4],
1399                    guint          hidden_side)
1400 {
1401   GtkRoundedBox padding_box;
1402   guint i, j;
1403
1404   padding_box = *border_box;
1405   _gtk_rounded_box_shrink (&padding_box, border->top, border->right, border->bottom, border->left);
1406
1407   if (hidden_side == 0 &&
1408       gdk_rgba_equal (&colors[0], &colors[1]) &&
1409       gdk_rgba_equal (&colors[0], &colors[2]) &&
1410       gdk_rgba_equal (&colors[0], &colors[3]))
1411     {
1412       gdk_cairo_set_source_rgba (cr, &colors[0]);
1413
1414       _gtk_rounded_box_path (border_box, cr);
1415       _gtk_rounded_box_path (&padding_box, cr);
1416       cairo_fill (cr);
1417     }
1418   else
1419     {
1420       for (i = 0; i < 4; i++)
1421         {
1422           if (hidden_side & (1 << i))
1423             continue;
1424
1425           for (j = 0; j < 4; j++)
1426             {
1427               if (hidden_side & (1 << j))
1428                 continue;
1429
1430               if (i == j ||
1431                   (gdk_rgba_equal (&colors[i], &colors[j])))
1432                 {
1433                   /* We were already painted when i == j */
1434                   if (i > j)
1435                     break;
1436
1437                   if (j == 0)
1438                     _gtk_rounded_box_path_top (border_box, &padding_box, cr);
1439                   else if (j == 1)
1440                     _gtk_rounded_box_path_right (border_box, &padding_box, cr);
1441                   else if (j == 2)
1442                     _gtk_rounded_box_path_bottom (border_box, &padding_box, cr);
1443                   else if (j == 3)
1444                     _gtk_rounded_box_path_left (border_box, &padding_box, cr);
1445                 }
1446             }
1447           /* We were already painted when i == j */
1448           if (i > j)
1449             continue;
1450
1451           gdk_cairo_set_source_rgba (cr, &colors[i]);
1452
1453           cairo_fill (cr);
1454         }
1455     }
1456 }
1457
1458 static void
1459 set_stroke_style (cairo_t        *cr,
1460                   double          line_width,
1461                   GtkBorderStyle  style,
1462                   double          length)
1463 {
1464   double segments[2];
1465   double n;
1466
1467   cairo_set_line_width (cr, line_width);
1468
1469   if (style == GTK_BORDER_STYLE_DOTTED)
1470     {
1471       n = round (0.5 * length / line_width);
1472
1473       segments[0] = 0;
1474       segments[1] = n ? length / n : 2;
1475       cairo_set_dash (cr, segments, G_N_ELEMENTS (segments), 0);
1476
1477       cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
1478       cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
1479     }
1480   else
1481     {
1482       n = length / line_width;
1483       /* Optimize the common case of an integer-sized rectangle
1484        * Again, we care about focus rectangles.
1485        */
1486       if (n == nearbyint (n))
1487         {
1488           segments[0] = 1;
1489           segments[1] = 2;
1490         }
1491       else
1492         {
1493           n = round ((1. / 3) * n);
1494
1495           segments[0] = n ? (1. / 3) * length / n : 1;
1496           segments[1] = 2 * segments[1];
1497         }
1498       cairo_set_dash (cr, segments, G_N_ELEMENTS (segments), 0);
1499
1500       cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1501       cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
1502     }
1503 }
1504
1505 static int
1506 get_border_side (GtkBorder  *border,
1507                  GtkCssSide  side)
1508 {
1509   switch (side)
1510     {
1511     case GTK_CSS_TOP:
1512       return border->top;
1513     case GTK_CSS_RIGHT:
1514       return border->right;
1515     case GTK_CSS_BOTTOM:
1516       return border->bottom;
1517     case GTK_CSS_LEFT:
1518       return border->left;
1519     default:
1520       g_assert_not_reached ();
1521       return 0;
1522     }
1523 }
1524
1525 static void
1526 render_frame_stroke (cairo_t       *cr,
1527                      GtkRoundedBox *border_box,
1528                      GtkBorder     *border,
1529                      GdkRGBA        colors[4],
1530                      guint          hidden_side,
1531                      GtkBorderStyle stroke_style)
1532 {
1533   gboolean different_colors, different_borders;
1534   GtkRoundedBox stroke_box;
1535   guint i;
1536
1537   different_colors = !gdk_rgba_equal (&colors[0], &colors[1]) ||
1538                      !gdk_rgba_equal (&colors[0], &colors[2]) ||
1539                      !gdk_rgba_equal (&colors[0], &colors[3]);
1540   different_borders = border->top != border->right ||
1541                       border->top != border->bottom ||
1542                       border->top != border->left;
1543
1544   stroke_box = *border_box;
1545   _gtk_rounded_box_shrink (&stroke_box,
1546                            border->top / 2.0,
1547                            border->right / 2.0,
1548                            border->bottom / 2.0,
1549                            border->left / 2.0);
1550
1551   if (!different_colors && !different_borders && hidden_side == 0)
1552     {
1553       double length = 0;
1554
1555       /* FAST PATH:
1556        * Mostly expected to trigger for focus rectangles */
1557       for (i = 0; i < 4; i++)
1558         {
1559           length += _gtk_rounded_box_guess_length (&stroke_box, i);
1560           _gtk_rounded_box_path_side (&stroke_box, cr, i);
1561         }
1562
1563       gdk_cairo_set_source_rgba (cr, &colors[0]);
1564       set_stroke_style (cr, border->top, stroke_style, length);
1565       cairo_stroke (cr);
1566     }
1567   else
1568     {
1569       GtkRoundedBox padding_box;
1570
1571       padding_box = *border_box;
1572       _gtk_rounded_box_path (&padding_box, cr);
1573       _gtk_rounded_box_shrink (&padding_box,
1574                                border->top,
1575                                border->right,
1576                                border->bottom,
1577                                border->left);
1578
1579       for (i = 0; i < 4; i++)
1580         {
1581           if (hidden_side & (1 << i))
1582             continue;
1583
1584           cairo_save (cr);
1585
1586           if (i == 0)
1587             _gtk_rounded_box_path_top (border_box, &padding_box, cr);
1588           else if (i == 1)
1589             _gtk_rounded_box_path_right (border_box, &padding_box, cr);
1590           else if (i == 2)
1591             _gtk_rounded_box_path_bottom (border_box, &padding_box, cr);
1592           else if (i == 3)
1593             _gtk_rounded_box_path_left (border_box, &padding_box, cr);
1594           cairo_clip (cr);
1595
1596           _gtk_rounded_box_path_side (&stroke_box, cr, i);
1597
1598           gdk_cairo_set_source_rgba (cr, &colors[i]);
1599           set_stroke_style (cr,
1600                             get_border_side (border, i),
1601                             stroke_style,
1602                             _gtk_rounded_box_guess_length (&stroke_box, i));
1603           cairo_stroke (cr);
1604
1605           cairo_restore (cr);
1606         }
1607     }
1608 }
1609
1610 static void
1611 render_border (cairo_t       *cr,
1612                GtkRoundedBox *border_box,
1613                GtkBorder     *border,
1614                guint          hidden_side,
1615                GdkRGBA        colors[4],
1616                GtkBorderStyle border_style[4])
1617 {
1618   guint i, j;
1619
1620   cairo_save (cr);
1621
1622   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
1623
1624   for (i = 0; i < 4; i++)
1625     {
1626       if (hidden_side & (1 << i))
1627         continue;
1628
1629       switch (border_style[i])
1630         {
1631         case GTK_BORDER_STYLE_NONE:
1632         case GTK_BORDER_STYLE_HIDDEN:
1633         case GTK_BORDER_STYLE_SOLID:
1634           break;
1635         case GTK_BORDER_STYLE_INSET:
1636           if (i == 1 || i == 2)
1637             color_shade (&colors[i], 1.8, &colors[i]);
1638           break;
1639         case GTK_BORDER_STYLE_OUTSET:
1640           if (i == 0 || i == 3)
1641             color_shade (&colors[i], 1.8, &colors[i]);
1642           break;
1643         case GTK_BORDER_STYLE_DOTTED:
1644         case GTK_BORDER_STYLE_DASHED:
1645           {
1646             guint dont_draw = hidden_side;
1647
1648             for (j = 0; j < 4; j++)
1649               {
1650                 if (border_style[j] == border_style[i])
1651                   hidden_side |= (1 << j);
1652                 else
1653                   dont_draw |= (1 << j);
1654               }
1655
1656             render_frame_stroke (cr, border_box, border, colors, dont_draw, border_style[i]);
1657           }
1658           break;
1659         case GTK_BORDER_STYLE_DOUBLE:
1660           {
1661             GtkRoundedBox other_box;
1662             GtkBorder other_border;
1663             guint dont_draw = hidden_side;
1664
1665             for (j = 0; j < 4; j++)
1666               {
1667                 if (border_style[j] == GTK_BORDER_STYLE_DOUBLE)
1668                   hidden_side |= (1 << j);
1669                 else
1670                   dont_draw |= (1 << j);
1671               }
1672             other_border.top = (border->top + 2) / 3;
1673             other_border.right = (border->right + 2) / 3;
1674             other_border.bottom = (border->bottom + 2) / 3;
1675             other_border.left = (border->left + 2) / 3;
1676
1677             render_frame_fill (cr, border_box, &other_border, colors, dont_draw);
1678
1679             other_box = *border_box;
1680             _gtk_rounded_box_shrink (&other_box,
1681                                      border->top - other_border.top,
1682                                      border->right - other_border.right,
1683                                      border->bottom - other_border.bottom,
1684                                      border->left - other_border.left);
1685             render_frame_fill (cr, &other_box, &other_border, colors, dont_draw);
1686           }
1687         case GTK_BORDER_STYLE_GROOVE:
1688         case GTK_BORDER_STYLE_RIDGE:
1689           {
1690             GtkRoundedBox other_box;
1691             GdkRGBA other_colors[4];
1692             guint dont_draw = hidden_side;
1693             GtkBorder other_border;
1694
1695             for (j = 0; j < 4; j++)
1696               {
1697                 other_colors[j] = colors[j];
1698                 if ((j == 0 || j == 3) ^ (border_style[j] == GTK_BORDER_STYLE_RIDGE))
1699                   color_shade (&other_colors[j], 1.8, &other_colors[j]);
1700                 else
1701                   color_shade (&colors[j], 1.8, &colors[j]);
1702                 if (border_style[j] == GTK_BORDER_STYLE_GROOVE ||
1703                     border_style[j] == GTK_BORDER_STYLE_RIDGE)
1704                   hidden_side |= (1 << j);
1705                 else
1706                   dont_draw |= (1 << j);
1707               }
1708             other_border.top = border->top / 2;
1709             other_border.right = border->right / 2;
1710             other_border.bottom = border->bottom / 2;
1711             other_border.left = border->left / 2;
1712
1713             render_frame_fill (cr, border_box, &other_border, colors, dont_draw);
1714
1715             other_box = *border_box;
1716             _gtk_rounded_box_shrink (&other_box,
1717                                      other_border.top, other_border.right,
1718                                      other_border.bottom, other_border.left);
1719             other_border.top = border->top - other_border.top;
1720             other_border.right = border->right - other_border.right;
1721             other_border.bottom = border->bottom - other_border.bottom;
1722             other_border.left = border->left - other_border.left;
1723             render_frame_fill (cr, &other_box, &other_border, other_colors, dont_draw);
1724           }
1725           break;
1726         default:
1727           g_assert_not_reached ();
1728           break;
1729         }
1730     }
1731
1732   render_frame_fill (cr, border_box, border, colors, hidden_side);
1733
1734   cairo_restore (cr);
1735 }
1736
1737 static void
1738 render_frame_internal (GtkThemingEngine *engine,
1739                        cairo_t          *cr,
1740                        gdouble           x,
1741                        gdouble           y,
1742                        gdouble           width,
1743                        gdouble           height,
1744                        guint             hidden_side,
1745                        GtkJunctionSides  junction)
1746 {
1747   GtkBorderImage border_image;
1748   GtkStateFlags state;
1749   GtkBorderStyle border_style[4];
1750   GtkRoundedBox border_box;
1751   gdouble progress;
1752   gboolean running;
1753   GtkBorder border;
1754   GdkRGBA *alloc_colors[4];
1755   GdkRGBA colors[4];
1756   guint i;
1757
1758   state = gtk_theming_engine_get_state (engine);
1759
1760   gtk_theming_engine_get_border (engine, state, &border);
1761   gtk_theming_engine_hide_border_sides (&border, hidden_side);
1762
1763   if (_gtk_border_image_init (&border_image, engine))
1764     _gtk_border_image_render (&border_image, &border, cr, x, y, width, height);
1765   else
1766     {
1767       gtk_theming_engine_get (engine, state,
1768                               "border-top-style", &border_style[0],
1769                               "border-right-style", &border_style[1],
1770                               "border-bottom-style", &border_style[2],
1771                               "border-left-style", &border_style[3],
1772                               "border-top-color", &alloc_colors[0],
1773                               "border-right-color", &alloc_colors[1],
1774                               "border-bottom-color", &alloc_colors[2],
1775                               "border-left-color", &alloc_colors[3],
1776                               NULL);
1777
1778       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1779
1780       if (running)
1781         {
1782           GtkStateFlags other_state;
1783           GdkRGBA *other_colors[4];
1784
1785           if (state & GTK_STATE_FLAG_PRELIGHT)
1786             {
1787               other_state = state & ~(GTK_STATE_FLAG_PRELIGHT);
1788               progress = 1 - progress;
1789             }
1790           else
1791             other_state = state | GTK_STATE_FLAG_PRELIGHT;
1792
1793           gtk_theming_engine_get (engine, other_state,
1794                                   "border-top-color", &other_colors[0],
1795                                   "border-right-color", &other_colors[1],
1796                                   "border-bottom-color", &other_colors[2],
1797                                   "border-left-color", &other_colors[3],
1798                                   NULL);
1799
1800           for (i = 0; i < 4; i++)
1801             {
1802               colors[i].red = CLAMP (alloc_colors[i]->red + ((other_colors[i]->red - alloc_colors[i]->red) * progress), 0, 1);
1803               colors[i].green = CLAMP (alloc_colors[i]->green + ((other_colors[i]->green - alloc_colors[i]->green) * progress), 0, 1);
1804               colors[i].blue = CLAMP (alloc_colors[i]->blue + ((other_colors[i]->blue - alloc_colors[i]->blue) * progress), 0, 1);
1805               colors[i].alpha = CLAMP (alloc_colors[i]->alpha + ((other_colors[i]->alpha - alloc_colors[i]->alpha) * progress), 0, 1);
1806               gdk_rgba_free (other_colors[i]);
1807               gdk_rgba_free (alloc_colors[i]);
1808             }
1809         }
1810       else
1811         {
1812           for (i = 0; i < 4; i++)
1813             {
1814               colors[i] = *alloc_colors[i];
1815               gdk_rgba_free (alloc_colors[i]);
1816             }
1817         }
1818
1819       _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1820       _gtk_rounded_box_apply_border_radius_for_engine (&border_box, engine, state, junction);
1821
1822       render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1823     }
1824
1825   border_style[0] = _gtk_css_border_style_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_STYLE));
1826   if (border_style[0] != GTK_BORDER_STYLE_NONE)
1827     {
1828       int offset;
1829
1830       border_style[1] = border_style[2] = border_style[3] = border_style[0];
1831       border.top = _gtk_css_value_get_int (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_WIDTH));
1832       border.left = border.right = border.bottom = border.top;
1833       colors[0] = *_gtk_css_rgba_value_get_rgba (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_COLOR));
1834       colors[3] = colors[2] = colors[1] = colors[0];
1835       offset = _gtk_css_number_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_OFFSET), 100);
1836
1837       /* reinit box here - outlines don't have a border radius */
1838       _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1839       _gtk_rounded_box_shrink (&border_box,
1840                                - border.top - offset,
1841                                - border.right - offset,
1842                                - border.left - offset,
1843                                - border.bottom - offset);
1844
1845       render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1846     }
1847 }
1848
1849 static void
1850 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1851                                  cairo_t          *cr,
1852                                  gdouble           x,
1853                                  gdouble           y,
1854                                  gdouble           width,
1855                                  gdouble           height)
1856 {
1857   GtkJunctionSides junction;
1858
1859   junction = gtk_theming_engine_get_junction_sides (engine);
1860
1861   render_frame_internal (engine, cr,
1862                          x, y, width, height,
1863                          0, junction);
1864 }
1865
1866 static void
1867 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1868                                     cairo_t          *cr,
1869                                     gdouble           x,
1870                                     gdouble           y,
1871                                     gdouble           width,
1872                                     gdouble           height)
1873 {
1874   GtkStateFlags flags;
1875   GdkRGBA outline_color, fg_color;
1876   double vertical_overshoot;
1877   int diameter;
1878   double radius;
1879   double interp;                /* interpolation factor for center position */
1880   double x_double_horz, y_double_horz;
1881   double x_double_vert, y_double_vert;
1882   double x_double, y_double;
1883   gdouble angle;
1884   gint line_width;
1885   gboolean running, is_rtl;
1886   gdouble progress;
1887
1888   cairo_save (cr);
1889   flags = gtk_theming_engine_get_state (engine);
1890
1891   gtk_theming_engine_get_color (engine, flags, &fg_color);
1892   gtk_theming_engine_get_border_color (engine, flags, &outline_color);
1893
1894   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1895   is_rtl = (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL);
1896   line_width = 1;
1897
1898   if (!running)
1899     progress = (flags & GTK_STATE_FLAG_ACTIVE) ? 1 : 0;
1900
1901   if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_HORIZONTAL))
1902     {
1903       if (is_rtl)
1904         angle = (G_PI) - ((G_PI / 2) * progress);
1905       else
1906         angle = (G_PI / 2) * progress;
1907     }
1908   else
1909     {
1910       if (is_rtl)
1911         angle = (G_PI / 2) + ((G_PI / 2) * progress);
1912       else
1913         angle = (G_PI / 2) - ((G_PI / 2) * progress);
1914     }
1915
1916   interp = progress;
1917
1918   /* Compute distance that the stroke extends beyonds the end
1919    * of the triangle we draw.
1920    */
1921   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
1922
1923   /* For odd line widths, we end the vertical line of the triangle
1924    * at a half pixel, so we round differently.
1925    */
1926   if (line_width % 2 == 1)
1927     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
1928   else
1929     vertical_overshoot = ceil (vertical_overshoot);
1930
1931   /* Adjust the size of the triangle we draw so that the entire stroke fits
1932    */
1933   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
1934
1935   /* If the line width is odd, we want the diameter to be even,
1936    * and vice versa, so force the sum to be odd. This relationship
1937    * makes the point of the triangle look right.
1938    */
1939   diameter -= (1 - (diameter + line_width) % 2);
1940
1941   radius = diameter / 2.;
1942
1943   /* Adjust the center so that the stroke is properly aligned with
1944    * the pixel grid. The center adjustment is different for the
1945    * horizontal and vertical orientations. For intermediate positions
1946    * we interpolate between the two.
1947    */
1948   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1949   y_double_vert = (y + height / 2) - 0.5;
1950
1951   x_double_horz = (x + width / 2) - 0.5;
1952   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1953
1954   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
1955   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
1956
1957   cairo_translate (cr, x_double, y_double);
1958   cairo_rotate (cr, angle);
1959
1960   cairo_move_to (cr, - radius / 2., - radius);
1961   cairo_line_to (cr,   radius / 2.,   0);
1962   cairo_line_to (cr, - radius / 2.,   radius);
1963   cairo_close_path (cr);
1964
1965   cairo_set_line_width (cr, line_width);
1966
1967   gdk_cairo_set_source_rgba (cr, &fg_color);
1968
1969   cairo_fill_preserve (cr);
1970
1971   gdk_cairo_set_source_rgba (cr, &outline_color);
1972   cairo_stroke (cr);
1973
1974   cairo_restore (cr);
1975 }
1976
1977 static void
1978 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
1979                                  cairo_t          *cr,
1980                                  gdouble           x,
1981                                  gdouble           y,
1982                                  gdouble           width,
1983                                  gdouble           height)
1984 {
1985   GtkStateFlags flags;
1986   GdkRGBA color;
1987   gint line_width;
1988   gint8 *dash_list;
1989
1990   cairo_save (cr);
1991   flags = gtk_theming_engine_get_state (engine);
1992
1993   gtk_theming_engine_get_color (engine, flags, &color);
1994
1995   gtk_theming_engine_get_style (engine,
1996                                 "focus-line-width", &line_width,
1997                                 "focus-line-pattern", (gchar *) &dash_list,
1998                                 NULL);
1999
2000   cairo_set_line_width (cr, (gdouble) line_width);
2001
2002   if (dash_list[0])
2003     {
2004       gint n_dashes = strlen ((const gchar *) dash_list);
2005       gdouble *dashes = g_new (gdouble, n_dashes);
2006       gdouble total_length = 0;
2007       gdouble dash_offset;
2008       gint i;
2009
2010       for (i = 0; i < n_dashes; i++)
2011         {
2012           dashes[i] = dash_list[i];
2013           total_length += dash_list[i];
2014         }
2015
2016       /* The dash offset here aligns the pattern to integer pixels
2017        * by starting the dash at the right side of the left border
2018        * Negative dash offsets in cairo don't work
2019        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
2020        */
2021       dash_offset = - line_width / 2.;
2022
2023       while (dash_offset < 0)
2024         dash_offset += total_length;
2025
2026       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
2027       g_free (dashes);
2028     }
2029
2030   cairo_rectangle (cr,
2031                    x + line_width / 2.,
2032                    y + line_width / 2.,
2033                    width - line_width,
2034                    height - line_width);
2035
2036   gdk_cairo_set_source_rgba (cr, &color);
2037   cairo_stroke (cr);
2038
2039   cairo_restore (cr);
2040
2041   g_free (dash_list);
2042 }
2043
2044 static void
2045 gtk_theming_engine_render_line (GtkThemingEngine *engine,
2046                                 cairo_t          *cr,
2047                                 gdouble           x0,
2048                                 gdouble           y0,
2049                                 gdouble           x1,
2050                                 gdouble           y1)
2051 {
2052   GdkRGBA color;
2053   GtkStateFlags flags;
2054
2055   flags = gtk_theming_engine_get_state (engine);
2056   cairo_save (cr);
2057
2058   gtk_theming_engine_get_color (engine, flags, &color);
2059
2060   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
2061   cairo_set_line_width (cr, 1);
2062
2063   cairo_move_to (cr, x0 + 0.5, y0 + 0.5);
2064   cairo_line_to (cr, x1 + 0.5, y1 + 0.5);
2065
2066   gdk_cairo_set_source_rgba (cr, &color);
2067   cairo_stroke (cr);
2068
2069   cairo_restore (cr);
2070 }
2071
2072 static void
2073 prepare_context_for_layout (cairo_t *cr,
2074                             gdouble x,
2075                             gdouble y,
2076                             PangoLayout *layout)
2077 {
2078   const PangoMatrix *matrix;
2079
2080   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2081
2082   cairo_move_to (cr, x, y);
2083
2084   if (matrix)
2085     {
2086       cairo_matrix_t cairo_matrix;
2087
2088       cairo_matrix_init (&cairo_matrix,
2089                          matrix->xx, matrix->yx,
2090                          matrix->xy, matrix->yy,
2091                          matrix->x0, matrix->y0);
2092
2093       cairo_transform (cr, &cairo_matrix);
2094     }
2095 }
2096
2097 static void
2098 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2099                                   cairo_t          *cr,
2100                                   gdouble           x,
2101                                   gdouble           y,
2102                                   PangoLayout      *layout)
2103 {
2104   GdkRGBA fg_color;
2105   GtkStateFlags flags;
2106   gdouble progress;
2107   gboolean running;
2108
2109   cairo_save (cr);
2110   flags = gtk_theming_engine_get_state (engine);
2111   gtk_theming_engine_get_color (engine, flags, &fg_color);
2112
2113   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
2114
2115   if (running)
2116     {
2117       GtkStateFlags other_flags;
2118       GdkRGBA other_fg;
2119
2120       if (flags & GTK_STATE_FLAG_PRELIGHT)
2121         {
2122           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
2123           progress = 1 - progress;
2124         }
2125       else
2126         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
2127
2128       gtk_theming_engine_get_color (engine, other_flags, &other_fg);
2129
2130       fg_color.red = CLAMP (fg_color.red + ((other_fg.red - fg_color.red) * progress), 0, 1);
2131       fg_color.green = CLAMP (fg_color.green + ((other_fg.green - fg_color.green) * progress), 0, 1);
2132       fg_color.blue = CLAMP (fg_color.blue + ((other_fg.blue - fg_color.blue) * progress), 0, 1);
2133       fg_color.alpha = CLAMP (fg_color.alpha + ((other_fg.alpha - fg_color.alpha) * progress), 0, 1);
2134     }
2135
2136   prepare_context_for_layout (cr, x, y, layout);
2137
2138   _gtk_css_shadows_value_paint_layout (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_TEXT_SHADOW),
2139                                        cr, layout);
2140
2141   gdk_cairo_set_source_rgba (cr, &fg_color);
2142   pango_cairo_show_layout (cr, layout);
2143
2144   cairo_restore (cr);
2145 }
2146
2147 static void
2148 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2149                                   cairo_t          *cr,
2150                                   gdouble           x,
2151                                   gdouble           y,
2152                                   gdouble           width,
2153                                   gdouble           height,
2154                                   GtkOrientation    orientation)
2155 {
2156   const GtkWidgetPath *path;
2157   gint thickness;
2158
2159   path = gtk_theming_engine_get_path (engine);
2160
2161   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2162   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2163
2164   /* FIXME: thickness */
2165   thickness = 2;
2166
2167   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
2168     {
2169       if (orientation == GTK_ORIENTATION_VERTICAL)
2170         gtk_theming_engine_render_line (engine, cr,
2171                                         x + thickness,
2172                                         y + (gint) height / 2,
2173                                         x + width - thickness - 1,
2174                                         y + (gint) height / 2);
2175       else
2176         gtk_theming_engine_render_line (engine, cr,
2177                                         x + (gint) width / 2,
2178                                         y + thickness,
2179                                         x + (gint) width / 2,
2180                                         y + height - thickness - 1);
2181     }
2182 }
2183
2184 static void
2185 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2186                                      cairo_t          *cr,
2187                                      gdouble           x,
2188                                      gdouble           y,
2189                                      gdouble           width,
2190                                      gdouble           height,
2191                                      GtkPositionType   gap_side,
2192                                      gdouble           xy0_gap,
2193                                      gdouble           xy1_gap)
2194 {
2195   GtkJunctionSides junction;
2196   GtkStateFlags state;
2197   gint border_width;
2198   GtkCssBorderCornerRadius *top_left_radius, *top_right_radius;
2199   GtkCssBorderCornerRadius *bottom_left_radius, *bottom_right_radius;
2200   gdouble x0, y0, x1, y1, xc, yc, wc, hc;
2201   GtkBorder border;
2202
2203   xc = yc = wc = hc = 0;
2204   state = gtk_theming_engine_get_state (engine);
2205   junction = gtk_theming_engine_get_junction_sides (engine);
2206
2207   gtk_theming_engine_get_border (engine, state, &border);
2208   gtk_theming_engine_get (engine, state,
2209                           "border-top-left-radius", &top_left_radius,
2210                           "border-top-right-radius", &top_right_radius,
2211                           "border-bottom-right-radius", &bottom_right_radius,
2212                           "border-bottom-left-radius", &bottom_left_radius,
2213                           NULL);
2214
2215   border_width = MIN (MIN (border.top, border.bottom),
2216                       MIN (border.left, border.right));
2217
2218   cairo_save (cr);
2219
2220   switch (gap_side)
2221     {
2222     case GTK_POS_TOP:
2223       xc = x + xy0_gap + border_width;
2224       yc = y;
2225       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2226       hc = border_width;
2227
2228       if (xy0_gap < _gtk_css_number_get (&top_left_radius->horizontal, width))
2229         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2230
2231       if (xy1_gap > width - _gtk_css_number_get (&top_right_radius->horizontal, width))
2232         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2233       break;
2234     case GTK_POS_BOTTOM:
2235       xc = x + xy0_gap + border_width;
2236       yc = y + height - border_width;
2237       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2238       hc = border_width;
2239
2240       if (xy0_gap < _gtk_css_number_get (&bottom_left_radius->horizontal, width))
2241         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2242
2243       if (xy1_gap > width - _gtk_css_number_get (&bottom_right_radius->horizontal, width))
2244         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2245
2246       break;
2247     case GTK_POS_LEFT:
2248       xc = x;
2249       yc = y + xy0_gap + border_width;
2250       wc = border_width;
2251       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2252
2253       if (xy0_gap < _gtk_css_number_get (&top_left_radius->vertical, height))
2254         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2255
2256       if (xy1_gap > height - _gtk_css_number_get (&bottom_left_radius->vertical, height))
2257         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2258
2259       break;
2260     case GTK_POS_RIGHT:
2261       xc = x + width - border_width;
2262       yc = y + xy0_gap + border_width;
2263       wc = border_width;
2264       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2265
2266       if (xy0_gap < _gtk_css_number_get (&top_right_radius->vertical, height))
2267         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2268
2269       if (xy1_gap > height - _gtk_css_number_get (&bottom_right_radius->vertical, height))
2270         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2271
2272       break;
2273     }
2274
2275   cairo_clip_extents (cr, &x0, &y0, &x1, &y1);
2276   cairo_rectangle (cr, x0, y0, x1 - x0, yc - y0);
2277   cairo_rectangle (cr, x0, yc, xc - x0, hc);
2278   cairo_rectangle (cr, xc + wc, yc, x1 - (xc + wc), hc);
2279   cairo_rectangle (cr, x0, yc + hc, x1 - x0, y1 - (yc + hc));
2280   cairo_clip (cr);
2281
2282   render_frame_internal (engine, cr,
2283                          x, y, width, height,
2284                          0, junction);
2285
2286   cairo_restore (cr);
2287
2288   g_free (top_left_radius);
2289   g_free (top_right_radius);
2290   g_free (bottom_right_radius);
2291   g_free (bottom_left_radius);
2292 }
2293
2294 static void
2295 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2296                                      cairo_t          *cr,
2297                                      gdouble           x,
2298                                      gdouble           y,
2299                                      gdouble           width,
2300                                      gdouble           height,
2301                                      GtkPositionType   gap_side)
2302 {
2303   GtkThemingBackground bg;
2304   GtkJunctionSides junction = 0;
2305   guint hidden_side = 0;
2306
2307   cairo_save (cr);
2308
2309   switch (gap_side)
2310     {
2311     case GTK_POS_LEFT:
2312       junction = GTK_JUNCTION_LEFT;
2313       hidden_side = (1 << GTK_CSS_LEFT);
2314
2315       cairo_translate (cr, x + width, y);
2316       cairo_rotate (cr, G_PI / 2);
2317       break;
2318     case GTK_POS_RIGHT:
2319       junction = GTK_JUNCTION_RIGHT;
2320       hidden_side = (1 << GTK_CSS_RIGHT);
2321
2322       cairo_translate (cr, x, y + height);
2323       cairo_rotate (cr, - G_PI / 2);
2324       break;
2325     case GTK_POS_TOP:
2326       junction = GTK_JUNCTION_TOP;
2327       hidden_side = (1 << GTK_CSS_TOP);
2328
2329       cairo_translate (cr, x + width, y + height);
2330       cairo_rotate (cr, G_PI);
2331       break;
2332     case GTK_POS_BOTTOM:
2333       junction = GTK_JUNCTION_BOTTOM;
2334       hidden_side = (1 << GTK_CSS_BOTTOM);
2335
2336       cairo_translate (cr, x, y);
2337       break;
2338     }
2339
2340   if (gap_side == GTK_POS_TOP ||
2341       gap_side == GTK_POS_BOTTOM)
2342     _gtk_theming_background_init (&bg, engine,
2343                                   0, 0,
2344                                   width, height,
2345                                   GTK_JUNCTION_BOTTOM);
2346   else
2347     _gtk_theming_background_init (&bg, engine,
2348                                   0, 0,
2349                                   height, width,
2350                                   GTK_JUNCTION_BOTTOM);
2351
2352   _gtk_theming_background_render (&bg, cr);
2353
2354   cairo_restore (cr);
2355
2356   cairo_save (cr);
2357
2358   render_frame_internal (engine, cr,
2359                          x, y, width, height,
2360                          hidden_side, junction);
2361
2362   cairo_restore (cr);
2363 }
2364
2365 static void
2366 render_dot (cairo_t       *cr,
2367             const GdkRGBA *lighter,
2368             const GdkRGBA *darker,
2369             gdouble        x,
2370             gdouble        y,
2371             gdouble        size)
2372 {
2373   size = CLAMP ((gint) size, 2, 3);
2374
2375   if (size == 2)
2376     {
2377       gdk_cairo_set_source_rgba (cr, lighter);
2378       cairo_rectangle (cr, x, y, 1, 1);
2379       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2380       cairo_fill (cr);
2381     }
2382   else if (size == 3)
2383     {
2384       gdk_cairo_set_source_rgba (cr, lighter);
2385       cairo_rectangle (cr, x, y, 2, 1);
2386       cairo_rectangle (cr, x, y, 1, 2);
2387       cairo_fill (cr);
2388
2389       gdk_cairo_set_source_rgba (cr, darker);
2390       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2391       cairo_rectangle (cr, x + 2, y, 1, 2);
2392       cairo_fill (cr);
2393     }
2394 }
2395
2396 static void
2397 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2398                                   cairo_t          *cr,
2399                                   gdouble           x,
2400                                   gdouble           y,
2401                                   gdouble           width,
2402                                   gdouble           height)
2403 {
2404   GtkStateFlags flags;
2405   GdkRGBA bg_color, lighter, darker;
2406   GtkJunctionSides sides;
2407   GtkThemingBackground bg;
2408   gint xx, yy;
2409
2410   cairo_save (cr);
2411   flags = gtk_theming_engine_get_state (engine);
2412
2413   cairo_set_line_width (cr, 1.0);
2414   sides = gtk_theming_engine_get_junction_sides (engine);
2415   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2416
2417   color_shade (&bg_color, 0.7, &darker);
2418   color_shade (&bg_color, 1.3, &lighter);
2419
2420   _gtk_theming_background_init (&bg, engine, x, y, width, height, sides);
2421   _gtk_theming_background_render (&bg, cr);
2422
2423   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_GRIP))
2424     {
2425       /* reduce confusing values to a meaningful state */
2426       if ((sides & (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)) == (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT))
2427         sides &= ~GTK_JUNCTION_CORNER_TOPLEFT;
2428
2429       if ((sides & (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT)) == (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT))
2430         sides &= ~GTK_JUNCTION_CORNER_TOPRIGHT;
2431
2432       if (sides == 0)
2433         sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2434
2435       /* align drawing area to the connected side */
2436       if (sides == GTK_JUNCTION_LEFT)
2437         {
2438           if (height < width)
2439             width = height;
2440         }
2441       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2442         {
2443           if (width < height)
2444             height = width;
2445           else if (height < width)
2446             width = height;
2447         }
2448       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2449         {
2450           /* make it square, aligning to bottom left */
2451           if (width < height)
2452             {
2453               y += (height - width);
2454               height = width;
2455             }
2456           else if (height < width)
2457             width = height;
2458         }
2459       else if (sides == GTK_JUNCTION_RIGHT)
2460         {
2461           /* aligning to right */
2462           if (height < width)
2463             {
2464               x += (width - height);
2465               width = height;
2466             }
2467         }
2468       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2469         {
2470           if (width < height)
2471             height = width;
2472           else if (height < width)
2473             {
2474               x += (width - height);
2475               width = height;
2476             }
2477         }
2478       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2479         {
2480           /* make it square, aligning to bottom right */
2481           if (width < height)
2482             {
2483               y += (height - width);
2484               height = width;
2485             }
2486           else if (height < width)
2487             {
2488               x += (width - height);
2489               width = height;
2490             }
2491         }
2492       else if (sides == GTK_JUNCTION_TOP)
2493         {
2494           if (width < height)
2495             height = width;
2496         }
2497       else if (sides == GTK_JUNCTION_BOTTOM)
2498         {
2499           /* align to bottom */
2500           if (width < height)
2501             {
2502               y += (height - width);
2503               height = width;
2504             }
2505         }
2506       else
2507         g_assert_not_reached ();
2508
2509       if (sides == GTK_JUNCTION_LEFT ||
2510           sides == GTK_JUNCTION_RIGHT)
2511         {
2512           gint xi;
2513
2514           xi = x;
2515
2516           while (xi < x + width)
2517             {
2518               gdk_cairo_set_source_rgba (cr, &lighter);
2519               add_path_line (cr, x, y, x, y + height);
2520               cairo_stroke (cr);
2521               xi++;
2522
2523               gdk_cairo_set_source_rgba (cr, &darker);
2524               add_path_line (cr, xi, y, xi, y + height);
2525               cairo_stroke (cr);
2526               xi += 2;
2527             }
2528         }
2529       else if (sides == GTK_JUNCTION_TOP ||
2530                sides == GTK_JUNCTION_BOTTOM)
2531         {
2532           gint yi;
2533
2534           yi = y;
2535
2536           while (yi < y + height)
2537             {
2538               gdk_cairo_set_source_rgba (cr, &lighter);
2539               add_path_line (cr, x, yi, x + width, yi);
2540               cairo_stroke (cr);
2541               yi++;
2542
2543               gdk_cairo_set_source_rgba (cr, &darker);
2544               add_path_line (cr, x, yi, x + width, yi);
2545               cairo_stroke (cr);
2546               yi += 2;
2547             }
2548         }
2549       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2550         {
2551           gint xi, yi;
2552
2553           xi = x + width;
2554           yi = y + height;
2555
2556           while (xi > x + 3)
2557             {
2558               gdk_cairo_set_source_rgba (cr, &darker);
2559               add_path_line (cr, xi, y, x, yi);
2560               cairo_stroke (cr);
2561
2562               --xi;
2563               --yi;
2564
2565               add_path_line (cr, xi, y, x, yi);
2566               cairo_stroke (cr);
2567
2568               --xi;
2569               --yi;
2570
2571               gdk_cairo_set_source_rgba (cr, &lighter);
2572               add_path_line (cr, xi, y, x, yi);
2573               cairo_stroke (cr);
2574
2575               xi -= 3;
2576               yi -= 3;
2577             }
2578         }
2579       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2580         {
2581           gint xi, yi;
2582
2583           xi = x;
2584           yi = y + height;
2585
2586           while (xi < (x + width - 3))
2587             {
2588               gdk_cairo_set_source_rgba (cr, &lighter);
2589               add_path_line (cr, xi, y, x + width, yi);
2590               cairo_stroke (cr);
2591
2592               ++xi;
2593               --yi;
2594
2595               gdk_cairo_set_source_rgba (cr, &darker);
2596               add_path_line (cr, xi, y, x + width, yi);
2597               cairo_stroke (cr);
2598
2599               ++xi;
2600               --yi;
2601
2602               add_path_line (cr, xi, y, x + width, yi);
2603               cairo_stroke (cr);
2604
2605               xi += 3;
2606               yi -= 3;
2607             }
2608         }
2609       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2610         {
2611           gint xi, yi;
2612
2613           xi = x + width;
2614           yi = y;
2615
2616           while (xi > x + 3)
2617             {
2618               gdk_cairo_set_source_rgba (cr, &darker);
2619               add_path_line (cr, x, yi, xi, y + height);
2620               cairo_stroke (cr);
2621
2622               --xi;
2623               ++yi;
2624
2625               add_path_line (cr, x, yi, xi, y + height);
2626               cairo_stroke (cr);
2627
2628               --xi;
2629               ++yi;
2630
2631               gdk_cairo_set_source_rgba (cr, &lighter);
2632               add_path_line (cr, x, yi, xi, y + height);
2633               cairo_stroke (cr);
2634
2635               xi -= 3;
2636               yi += 3;
2637             }
2638         }
2639       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2640         {
2641           gint xi, yi;
2642
2643           xi = x;
2644           yi = y;
2645
2646           while (xi < (x + width - 3))
2647             {
2648               gdk_cairo_set_source_rgba (cr, &lighter);
2649               add_path_line (cr, xi, y + height, x + width, yi);
2650               cairo_stroke (cr);
2651
2652               ++xi;
2653               ++yi;
2654
2655               gdk_cairo_set_source_rgba (cr, &darker);
2656               add_path_line (cr, xi, y + height, x + width, yi);
2657               cairo_stroke (cr);
2658
2659               ++xi;
2660               ++yi;
2661
2662               add_path_line (cr, xi, y + height, x + width, yi);
2663               cairo_stroke (cr);
2664
2665               xi += 3;
2666               yi += 3;
2667             }
2668         }
2669     }
2670   else if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_PANE_SEPARATOR))
2671     {
2672       if (width > height)
2673         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2674           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2675       else
2676         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2677           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2678     }
2679   else
2680     {
2681       for (yy = y; yy < y + height; yy += 3)
2682         for (xx = x; xx < x + width; xx += 6)
2683           {
2684             render_dot (cr, &lighter, &darker, xx, yy, 2);
2685             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2686           }
2687     }
2688
2689   cairo_restore (cr);
2690 }
2691
2692 void
2693 _gtk_theming_engine_paint_spinner (cairo_t       *cr,
2694                                    gdouble        radius,
2695                                    gdouble        progress,
2696                                    const GdkRGBA *color)
2697 {
2698   guint num_steps, step;
2699   gdouble half;
2700   gint i;
2701
2702   num_steps = 12;
2703
2704   if (progress >= 0)
2705     step = (guint) (progress * num_steps);
2706   else
2707     step = 0;
2708
2709   cairo_save (cr);
2710
2711   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2712   cairo_set_line_width (cr, 2.0);
2713
2714   half = num_steps / 2;
2715
2716   for (i = 0; i < num_steps; i++)
2717     {
2718       gint inset = 0.7 * radius;
2719
2720       /* transparency is a function of time and intial value */
2721       gdouble t = 1.0 - (gdouble) ((i + step) % num_steps) / num_steps;
2722       gdouble xscale = - sin (i * G_PI / half);
2723       gdouble yscale = - cos (i * G_PI / half);
2724
2725       cairo_set_source_rgba (cr,
2726                              color->red,
2727                              color->green,
2728                              color->blue,
2729                              color->alpha * t);
2730
2731       cairo_move_to (cr,
2732                      (radius - inset) * xscale,
2733                      (radius - inset) * yscale);
2734       cairo_line_to (cr,
2735                      radius * xscale,
2736                      radius * yscale);
2737
2738       cairo_stroke (cr);
2739     }
2740
2741   cairo_restore (cr);
2742 }
2743
2744 static void
2745 render_spinner (GtkThemingEngine *engine,
2746                 cairo_t          *cr,
2747                 gdouble           x,
2748                 gdouble           y,
2749                 gdouble           width,
2750                 gdouble           height)
2751 {
2752   GtkStateFlags state;
2753   GdkRGBA color;
2754   gdouble progress;
2755   gdouble radius;
2756
2757   state = gtk_theming_engine_get_state (engine);
2758
2759   if (!gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
2760     progress = -1;
2761
2762   radius = MIN (width / 2, height / 2);
2763
2764   gtk_theming_engine_get_color (engine, state, &color);
2765
2766   cairo_save (cr);
2767   cairo_translate (cr, x + width / 2, y + height / 2);
2768
2769   _gtk_css_shadows_value_paint_spinner (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_ICON_SHADOW),
2770                                         cr,
2771                                         radius,
2772                                         progress);
2773
2774   _gtk_theming_engine_paint_spinner (cr,
2775                                      radius,
2776                                      progress,
2777                                      &color);
2778
2779   cairo_restore (cr);
2780 }
2781
2782 static void
2783 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2784                                     cairo_t          *cr,
2785                                     gdouble           x,
2786                                     gdouble           y,
2787                                     gdouble           width,
2788                                     gdouble           height)
2789 {
2790   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
2791     {
2792       render_spinner (engine, cr, x, y, width, height);
2793     }
2794   else
2795     {
2796       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2797       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2798     }
2799 }
2800
2801 static GdkPixbuf *
2802 scale_or_ref (GdkPixbuf *src,
2803               gint       width,
2804               gint       height)
2805 {
2806   if (width == gdk_pixbuf_get_width (src) &&
2807       height == gdk_pixbuf_get_height (src))
2808     return g_object_ref (src);
2809   else
2810     return gdk_pixbuf_scale_simple (src,
2811                                     width, height,
2812                                     GDK_INTERP_BILINEAR);
2813 }
2814
2815 static gboolean
2816 lookup_icon_size (GtkThemingEngine *engine,
2817                   GtkIconSize       size,
2818                   gint             *width,
2819                   gint             *height)
2820 {
2821   GdkScreen *screen;
2822   GtkSettings *settings;
2823
2824   screen = gtk_theming_engine_get_screen (engine);
2825   settings = gtk_settings_get_for_screen (screen);
2826
2827   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
2828 }
2829
2830 static void
2831 colorshift_source (cairo_t *cr,
2832                    gdouble shift)
2833 {
2834   cairo_pattern_t *source;
2835
2836   cairo_save (cr);
2837   cairo_paint (cr);
2838
2839   source = cairo_pattern_reference (cairo_get_source (cr));
2840
2841   cairo_set_source_rgb (cr, shift, shift, shift);
2842   cairo_set_operator (cr, CAIRO_OPERATOR_COLOR_DODGE);
2843
2844   cairo_mask (cr, source);
2845
2846   cairo_pattern_destroy (source);
2847   cairo_restore (cr);
2848 }
2849
2850 static GdkPixbuf *
2851 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
2852                                        const GtkIconSource *source,
2853                                        GtkIconSize          size)
2854 {
2855   GdkPixbuf *scaled;
2856   GdkPixbuf *stated;
2857   GdkPixbuf *base_pixbuf;
2858   GtkStateFlags state;
2859   gint width = 1;
2860   gint height = 1;
2861   cairo_t *cr;
2862   cairo_surface_t *surface;
2863
2864   base_pixbuf = gtk_icon_source_get_pixbuf (source);
2865   state = gtk_theming_engine_get_state (engine);
2866
2867   g_return_val_if_fail (base_pixbuf != NULL, NULL);
2868
2869   if (size != (GtkIconSize) -1 &&
2870       !lookup_icon_size (engine, size, &width, &height))
2871     {
2872       g_warning (G_STRLOC ": invalid icon size '%d'", size);
2873       return NULL;
2874     }
2875
2876   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
2877    * leave it alone.
2878    */
2879   if (size != (GtkIconSize) -1 &&
2880       gtk_icon_source_get_size_wildcarded (source))
2881     scaled = scale_or_ref (base_pixbuf, width, height);
2882   else
2883     scaled = g_object_ref (base_pixbuf);
2884
2885   /* If the state was wildcarded, then generate a state. */
2886   if (gtk_icon_source_get_state_wildcarded (source))
2887     {
2888       if (state & GTK_STATE_FLAG_INSENSITIVE)
2889         {
2890           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2891                                                 gdk_pixbuf_get_width (scaled),
2892                                                 gdk_pixbuf_get_height (scaled));
2893           cr = cairo_create (surface);
2894           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2895           cairo_paint_with_alpha (cr, 0.5);
2896
2897           cairo_destroy (cr);
2898
2899           g_object_unref (scaled);
2900           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2901                                                 cairo_image_surface_get_width (surface),
2902                                                 cairo_image_surface_get_height (surface));
2903           cairo_surface_destroy (surface);
2904         }
2905       else if (state & GTK_STATE_FLAG_PRELIGHT)
2906         {
2907           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2908                                                 gdk_pixbuf_get_width (scaled),
2909                                                 gdk_pixbuf_get_height (scaled));
2910
2911           cr = cairo_create (surface);
2912           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2913           colorshift_source (cr, 0.10);
2914
2915           cairo_destroy (cr);
2916
2917           g_object_unref (scaled);
2918           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2919                                                 cairo_image_surface_get_width (surface),
2920                                                 cairo_image_surface_get_height (surface));
2921           cairo_surface_destroy (surface);
2922         }
2923       else
2924         stated = scaled;
2925     }
2926   else
2927     stated = scaled;
2928
2929   return stated;
2930 }
2931
2932 static void
2933 gtk_theming_engine_render_icon (GtkThemingEngine *engine,
2934                                 cairo_t *cr,
2935                                 GdkPixbuf *pixbuf,
2936                                 gdouble x,
2937                                 gdouble y)
2938 {
2939   cairo_save (cr);
2940
2941   gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
2942
2943   _gtk_css_shadows_value_paint_icon (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_ICON_SHADOW), cr);
2944
2945   cairo_paint (cr);
2946
2947   cairo_restore (cr);
2948 }
2949