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 "gtkshadowprivate.h"
  32 #include "gtkcsstypesprivate.h"
  33 #include "gtkthemingengineprivate.h"
  34 #include "gtkroundedboxprivate.h"
  35 #include "gtkthemingbackgroundprivate.h"
  36
  37 #include "fallback-c89.c"
  38
  39 /**
  40  * SECTION:gtkthemingengine
  41  * @Short_description: Theming renderers
  42  * @Title: GtkThemingEngine
  43  * @See_also: #GtkStyleContext
  44  *
  45  * #GtkThemingEngine is the object used for rendering themed content
  46  * in GTK+ widgets. Even though GTK+ has a default implementation,
  47  * it can be overridden in CSS files by enforcing a #GtkThemingEngine
  48  * object to be loaded as a module.
  49  *
  50  * In order to implement a theming engine, a #GtkThemingEngine subclass
  51  * must be created, alongside the CSS file that will reference it, the
  52  * theming engine would be created as an .so library, and installed in
  53  * $(gtk-modules-dir)/theming-engines/.
  54  *
  55  * #GtkThemingEngine<!-- -->s have limited access to the object they are
  56  * rendering, the #GtkThemingEngine API has read-only accessors to the
  57  * style information contained in the rendered object's #GtkStyleContext.
  58  */
  59
  60 enum {
  61   PROP_0,
  62   PROP_NAME
  63 };
  64
  65 struct GtkThemingEnginePrivate
  66 {
  67   GtkStyleContext *context;
  68   gchar *name;
  69 };
  70
  71 #define GTK_THEMING_ENGINE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_THEMING_ENGINE, GtkThemingEnginePrivate))
  72
  73 static void gtk_theming_engine_finalize          (GObject      *object);
  74 static void gtk_theming_engine_impl_set_property (GObject      *object,
  75                                                   guint         prop_id,
  76                                                   const GValue *value,
  77                                                   GParamSpec   *pspec);
  78 static void gtk_theming_engine_impl_get_property (GObject      *object,
  79                                                   guint         prop_id,
  80                                                   GValue       *value,
  81                                                   GParamSpec   *pspec);
  82
  83 static void gtk_theming_engine_render_check (GtkThemingEngine *engine,
  84                                              cairo_t          *cr,
  85                                              gdouble           x,
  86                                              gdouble           y,
  87                                              gdouble           width,
  88                                              gdouble           height);
  89 static void gtk_theming_engine_render_option (GtkThemingEngine *engine,
  90                                               cairo_t          *cr,
  91                                               gdouble           x,
  92                                               gdouble           y,
  93                                               gdouble           width,
  94                                               gdouble           height);
  95 static void gtk_theming_engine_render_arrow  (GtkThemingEngine *engine,
  96                                               cairo_t          *cr,
  97                                               gdouble           angle,
  98                                               gdouble           x,
  99                                               gdouble           y,
 100                                               gdouble           size);
 101 static void gtk_theming_engine_render_background (GtkThemingEngine *engine,
 102                                                   cairo_t          *cr,
 103                                                   gdouble           x,
 104                                                   gdouble           y,
 105                                                   gdouble           width,
 106                                                   gdouble           height);
 107 static void gtk_theming_engine_render_frame  (GtkThemingEngine *engine,
 108                                               cairo_t          *cr,
 109                                               gdouble           x,
 110                                               gdouble           y,
 111                                               gdouble           width,
 112                                               gdouble           height);
 113 static void gtk_theming_engine_render_expander (GtkThemingEngine *engine,
 114                                                 cairo_t          *cr,
 115                                                 gdouble           x,
 116                                                 gdouble           y,
 117                                                 gdouble           width,
 118                                                 gdouble           height);
 119 static void gtk_theming_engine_render_focus    (GtkThemingEngine *engine,
 120                                                 cairo_t          *cr,
 121                                                 gdouble           x,
 122                                                 gdouble           y,
 123                                                 gdouble           width,
 124                                                 gdouble           height);
 125 static void gtk_theming_engine_render_layout   (GtkThemingEngine *engine,
 126                                                 cairo_t          *cr,
 127                                                 gdouble           x,
 128                                                 gdouble           y,
 129                                                 PangoLayout      *layout);
 130 static void gtk_theming_engine_render_line     (GtkThemingEngine *engine,
 131                                                 cairo_t          *cr,
 132                                                 gdouble           x0,
 133                                                 gdouble           y0,
 134                                                 gdouble           x1,
 135                                                 gdouble           y1);
 136 static void gtk_theming_engine_render_slider   (GtkThemingEngine *engine,
 137                                                 cairo_t          *cr,
 138                                                 gdouble           x,
 139                                                 gdouble           y,
 140                                                 gdouble           width,
 141                                                 gdouble           height,
 142                                                 GtkOrientation    orientation);
 143 static void gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
 144                                                  cairo_t          *cr,
 145                                                  gdouble           x,
 146                                                  gdouble           y,
 147                                                  gdouble           width,
 148                                                  gdouble           height,
 149                                                  GtkPositionType   gap_side,
 150                                                  gdouble           xy0_gap,
 151                                                  gdouble           xy1_gap);
 152 static void gtk_theming_engine_render_extension (GtkThemingEngine *engine,
 153                                                  cairo_t          *cr,
 154                                                  gdouble           x,
 155                                                  gdouble           y,
 156                                                  gdouble           width,
 157                                                  gdouble           height,
 158                                                  GtkPositionType   gap_side);
 159 static void gtk_theming_engine_render_handle    (GtkThemingEngine *engine,
 160                                                  cairo_t          *cr,
 161                                                  gdouble           x,
 162                                                  gdouble           y,
 163                                                  gdouble           width,
 164                                                  gdouble           height);
 165 static void gtk_theming_engine_render_activity  (GtkThemingEngine *engine,
 166                                                  cairo_t          *cr,
 167                                                  gdouble           x,
 168                                                  gdouble           y,
 169                                                  gdouble           width,
 170                                                  gdouble           height);
 171 static GdkPixbuf * gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
 172                                                           const GtkIconSource *source,
 173                                                           GtkIconSize          size);
 174 static void gtk_theming_engine_render_icon (GtkThemingEngine *engine,
 175                                             cairo_t *cr,
 176                                             GdkPixbuf *pixbuf,
 177                                             gdouble x,
 178                                             gdouble y);
 179
 180 G_DEFINE_TYPE (GtkThemingEngine, gtk_theming_engine, G_TYPE_OBJECT)
 181
 182
 183 typedef struct GtkThemingModule GtkThemingModule;
 184 typedef struct GtkThemingModuleClass GtkThemingModuleClass;
 185
 186 struct GtkThemingModule
 187 {
 188   GTypeModule parent_instance;
 189   GModule *module;
 190   gchar *name;
 191
 192   void (*init) (GTypeModule *module);
 193   void (*exit) (void);
 194   GtkThemingEngine * (*create_engine) (void);
 195 };
 196
 197 struct GtkThemingModuleClass
 198 {
 199   GTypeModuleClass parent_class;
 200 };
 201
 202 #define GTK_TYPE_THEMING_MODULE  (gtk_theming_module_get_type ())
 203 #define GTK_THEMING_MODULE(o)    (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_THEMING_MODULE, GtkThemingModule))
 204 #define GTK_IS_THEMING_MODULE(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_THEMING_MODULE))
 205
 206 G_DEFINE_TYPE (GtkThemingModule, gtk_theming_module, G_TYPE_TYPE_MODULE);
 207
 208 static void
 209 gtk_theming_engine_class_init (GtkThemingEngineClass *klass)
 210 {
 211   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 212
 213   object_class->finalize = gtk_theming_engine_finalize;
 214   object_class->set_property = gtk_theming_engine_impl_set_property;
 215   object_class->get_property = gtk_theming_engine_impl_get_property;
 216
 217   klass->render_icon = gtk_theming_engine_render_icon;
 218   klass->render_check = gtk_theming_engine_render_check;
 219   klass->render_option = gtk_theming_engine_render_option;
 220   klass->render_arrow = gtk_theming_engine_render_arrow;
 221   klass->render_background = gtk_theming_engine_render_background;
 222   klass->render_frame = gtk_theming_engine_render_frame;
 223   klass->render_expander = gtk_theming_engine_render_expander;
 224   klass->render_focus = gtk_theming_engine_render_focus;
 225   klass->render_layout = gtk_theming_engine_render_layout;
 226   klass->render_line = gtk_theming_engine_render_line;
 227   klass->render_slider = gtk_theming_engine_render_slider;
 228   klass->render_frame_gap = gtk_theming_engine_render_frame_gap;
 229   klass->render_extension = gtk_theming_engine_render_extension;
 230   klass->render_handle = gtk_theming_engine_render_handle;
 231   klass->render_activity = gtk_theming_engine_render_activity;
 232   klass->render_icon_pixbuf = gtk_theming_engine_render_icon_pixbuf;
 233
 234   /**
 235    * GtkThemingEngine:name:
 236    *
 237    * The theming engine name, this name will be used when registering
 238    * custom properties, for a theming engine named "Clearlooks" registering
 239    * a "glossy" custom property, it could be referenced in the CSS file as
 240    *
 241    * <programlisting>
 242    * -Clearlooks-glossy: true;
 243    * </programlisting>
 244    *
 245    * Since: 3.0
 246    */
 247   g_object_class_install_property (object_class,
 248                                    PROP_NAME,
 249                                    g_param_spec_string ("name",
 250                                                         P_("Name"),
 251                                                         P_("Theming engine name"),
 252                                                         NULL,
 253                                                         G_PARAM_CONSTRUCT_ONLY | GTK_PARAM_READWRITE));
 254
 255   g_type_class_add_private (object_class, sizeof (GtkThemingEnginePrivate));
 256 }
 257
 258 static void
 259 gtk_theming_engine_init (GtkThemingEngine *engine)
 260 {
 261   engine->priv = GTK_THEMING_ENGINE_GET_PRIVATE (engine);
 262 }
 263
 264 static void
 265 gtk_theming_engine_finalize (GObject *object)
 266 {
 267   GtkThemingEnginePrivate *priv;
 268
 269   priv = GTK_THEMING_ENGINE (object)->priv;
 270   g_free (priv->name);
 271
 272   G_OBJECT_GET_CLASS (gtk_theming_engine_parent_class)->finalize (object);
 273 }
 274
 275 static void
 276 gtk_theming_engine_impl_set_property (GObject      *object,
 277                                       guint         prop_id,
 278                                       const GValue *value,
 279                                       GParamSpec   *pspec)
 280 {
 281   GtkThemingEnginePrivate *priv;
 282
 283   priv = GTK_THEMING_ENGINE (object)->priv;
 284
 285   switch (prop_id)
 286     {
 287     case PROP_NAME:
 288       if (priv->name)
 289         g_free (priv->name);
 290
 291       priv->name = g_value_dup_string (value);
 292       break;
 293     default:
 294       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 295       break;
 296     }
 297 }
 298
 299 static void
 300 gtk_theming_engine_impl_get_property (GObject    *object,
 301                                       guint       prop_id,
 302                                       GValue     *value,
 303                                       GParamSpec *pspec)
 304 {
 305   GtkThemingEnginePrivate *priv;
 306
 307   priv = GTK_THEMING_ENGINE (object)->priv;
 308
 309   switch (prop_id)
 310     {
 311     case PROP_NAME:
 312       g_value_set_string (value, priv->name);
 313       break;
 314     default:
 315       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 316       break;
 317     }
 318 }
 319
 320 void
 321 _gtk_theming_engine_set_context (GtkThemingEngine *engine,
 322                                  GtkStyleContext  *context)
 323 {
 324   GtkThemingEnginePrivate *priv;
 325
 326   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 327   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
 328
 329   priv = engine->priv;
 330   priv->context = context;
 331 }
 332
 333 GtkStyleContext *
 334 _gtk_theming_engine_get_context (GtkThemingEngine *engine)
 335 {
 336   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 337
 338   return engine->priv->context;
 339 }
 340
 341 GtkCssValue *
 342 _gtk_theming_engine_peek_property (GtkThemingEngine *engine,
 343                                    const char       *property_name)
 344 {
 345   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 346   g_return_val_if_fail (property_name != NULL, NULL);
 347
 348   return _gtk_style_context_peek_property (engine->priv->context, property_name);
 349 }
 350
 351 double
 352 _gtk_theming_engine_get_number (GtkThemingEngine *engine,
 353                                 const char       *property_name,
 354                                 double            one_hundred_percent)
 355 {
 356   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0.0);
 357   g_return_val_if_fail (property_name != NULL, 0.0);
 358
 359   return _gtk_style_context_get_number (engine->priv->context, property_name, one_hundred_percent);
 360 }
 361
 362 /**
 363  * gtk_theming_engine_get_property:
 364  * @engine: a #GtkThemingEngine
 365  * @property: the property name
 366  * @state: state to retrieve the value for
 367  * @value: (out) (transfer full): return location for the property value,
 368  *         you must free this memory using g_value_unset() once you are
 369  *         done with it.
 370  *
 371  * Gets a property value as retrieved from the style settings that apply
 372  * to the currently rendered element.
 373  *
 374  * Since: 3.0
 375  **/
 376 void
 377 gtk_theming_engine_get_property (GtkThemingEngine *engine,
 378                                  const gchar      *property,
 379                                  GtkStateFlags     state,
 380                                  GValue           *value)
 381 {
 382   GtkThemingEnginePrivate *priv;
 383
 384   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 385   g_return_if_fail (property != NULL);
 386   g_return_if_fail (value != NULL);
 387
 388   priv = engine->priv;
 389   gtk_style_context_get_property (priv->context, property, state, value);
 390 }
 391
 392 /**
 393  * gtk_theming_engine_get_valist:
 394  * @engine: a #GtkThemingEngine
 395  * @state: state to retrieve values for
 396  * @args: va_list of property name/return location pairs, followed by %NULL
 397  *
 398  * Retrieves several style property values that apply to the currently
 399  * rendered element.
 400  *
 401  * Since: 3.0
 402  **/
 403 void
 404 gtk_theming_engine_get_valist (GtkThemingEngine *engine,
 405                                GtkStateFlags     state,
 406                                va_list           args)
 407 {
 408   GtkThemingEnginePrivate *priv;
 409
 410   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 411
 412   priv = engine->priv;
 413   gtk_style_context_get_valist (priv->context, state, args);
 414 }
 415
 416 /**
 417  * gtk_theming_engine_get:
 418  * @engine: a #GtkThemingEngine
 419  * @state: state to retrieve values for
 420  * @...: property name /return value pairs, followed by %NULL
 421  *
 422  * Retrieves several style property values that apply to the currently
 423  * rendered element.
 424  *
 425  * Since: 3.0
 426  **/
 427 void
 428 gtk_theming_engine_get (GtkThemingEngine *engine,
 429                         GtkStateFlags     state,
 430                         ...)
 431 {
 432   GtkThemingEnginePrivate *priv;
 433   va_list args;
 434
 435   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 436
 437   priv = engine->priv;
 438
 439   va_start (args, state);
 440   gtk_style_context_get_valist (priv->context, state, args);
 441   va_end (args);
 442 }
 443
 444 /**
 445  * gtk_theming_engine_get_style_property:
 446  * @engine: a #GtkThemingEngine
 447  * @property_name: the name of the widget style property
 448  * @value: Return location for the property value, free with
 449  *         g_value_unset() after use.
 450  *
 451  * Gets the value for a widget style property.
 452  *
 453  * Since: 3.0
 454  **/
 455 void
 456 gtk_theming_engine_get_style_property (GtkThemingEngine *engine,
 457                                        const gchar      *property_name,
 458                                        GValue           *value)
 459 {
 460   GtkThemingEnginePrivate *priv;
 461
 462   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 463   g_return_if_fail (property_name != NULL);
 464
 465   priv = engine->priv;
 466   gtk_style_context_get_style_property (priv->context, property_name, value);
 467 }
 468
 469 /**
 470  * gtk_theming_engine_get_style_valist:
 471  * @engine: a #GtkThemingEngine
 472  * @args: va_list of property name/return location pairs, followed by %NULL
 473  *
 474  * Retrieves several widget style properties from @engine according to the
 475  * currently rendered content's style.
 476  *
 477  * Since: 3.0
 478  **/
 479 void
 480 gtk_theming_engine_get_style_valist (GtkThemingEngine *engine,
 481                                      va_list           args)
 482 {
 483   GtkThemingEnginePrivate *priv;
 484
 485   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 486
 487   priv = engine->priv;
 488   gtk_style_context_get_style_valist (priv->context, args);
 489 }
 490
 491 /**
 492  * gtk_theming_engine_get_style:
 493  * @engine: a #GtkThemingEngine
 494  * @...: property name /return value pairs, followed by %NULL
 495  *
 496  * Retrieves several widget style properties from @engine according
 497  * to the currently rendered content's style.
 498  *
 499  * Since: 3.0
 500  **/
 501 void
 502 gtk_theming_engine_get_style (GtkThemingEngine *engine,
 503                               ...)
 504 {
 505   GtkThemingEnginePrivate *priv;
 506   va_list args;
 507
 508   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 509
 510   priv = engine->priv;
 511
 512   va_start (args, engine);
 513   gtk_style_context_get_style_valist (priv->context, args);
 514   va_end (args);
 515 }
 516
 517 /**
 518  * gtk_theming_engine_lookup_color:
 519  * @engine: a #GtkThemingEngine
 520  * @color_name: color name to lookup
 521  * @color: (out): Return location for the looked up color
 522  *
 523  * Looks up and resolves a color name in the current style's color map.
 524  *
 525  * Returns: %TRUE if @color_name was found and resolved, %FALSE otherwise
 526  **/
 527 gboolean
 528 gtk_theming_engine_lookup_color (GtkThemingEngine *engine,
 529                                  const gchar      *color_name,
 530                                  GdkRGBA          *color)
 531 {
 532   GtkThemingEnginePrivate *priv;
 533
 534   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 535   g_return_val_if_fail (color_name != NULL, FALSE);
 536
 537   priv = engine->priv;
 538   return gtk_style_context_lookup_color (priv->context, color_name, color);
 539 }
 540
 541 /**
 542  * gtk_theming_engine_get_state:
 543  * @engine: a #GtkThemingEngine
 544  *
 545  * returns the state used when rendering.
 546  *
 547  * Returns: the state flags
 548  *
 549  * Since: 3.0
 550  **/
 551 GtkStateFlags
 552 gtk_theming_engine_get_state (GtkThemingEngine *engine)
 553 {
 554   GtkThemingEnginePrivate *priv;
 555
 556   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 557
 558   priv = engine->priv;
 559   return gtk_style_context_get_state (priv->context);
 560 }
 561
 562 /**
 563  * gtk_theming_engine_state_is_running:
 564  * @engine: a #GtkThemingEngine
 565  * @state: a widget state
 566  * @progress: (out): return location for the transition progress
 567  *
 568  * Returns %TRUE if there is a transition animation running for the
 569  * current region (see gtk_style_context_push_animatable_region()).
 570  *
 571  * If @progress is not %NULL, the animation progress will be returned
 572  * there, 0.0 means the state is closest to being %FALSE, while 1.0 means
 573  * it's closest to being %TRUE. This means transition animations will
 574  * run from 0 to 1 when @state is being set to %TRUE and from 1 to 0 when
 575  * it's being set to %FALSE.
 576  *
 577  * Returns: %TRUE if there is a running transition animation for @state.
 578  *
 579  * Since: 3.0
 580  **/
 581 gboolean
 582 gtk_theming_engine_state_is_running (GtkThemingEngine *engine,
 583                                      GtkStateType      state,
 584                                      gdouble          *progress)
 585 {
 586   GtkThemingEnginePrivate *priv;
 587
 588   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 589
 590   priv = engine->priv;
 591   return gtk_style_context_state_is_running (priv->context, state, progress);
 592 }
 593
 594 /**
 595  * gtk_theming_engine_get_path:
 596  * @engine: a #GtkThemingEngine
 597  *
 598  * Returns the widget path used for style matching.
 599  *
 600  * Returns: (transfer none): A #GtkWidgetPath
 601  *
 602  * Since: 3.0
 603  **/
 604 const GtkWidgetPath *
 605 gtk_theming_engine_get_path (GtkThemingEngine *engine)
 606 {
 607   GtkThemingEnginePrivate *priv;
 608
 609   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 610
 611   priv = engine->priv;
 612   return gtk_style_context_get_path (priv->context);
 613 }
 614
 615 /**
 616  * gtk_theming_engine_has_class:
 617  * @engine: a #GtkThemingEngine
 618  * @style_class: class name to look up
 619  *
 620  * Returns %TRUE if the currently rendered contents have
 621  * defined the given class name.
 622  *
 623  * Returns: %TRUE if @engine has @class_name defined
 624  *
 625  * Since: 3.0
 626  **/
 627 gboolean
 628 gtk_theming_engine_has_class (GtkThemingEngine *engine,
 629                               const gchar      *style_class)
 630 {
 631   GtkThemingEnginePrivate *priv;
 632
 633   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 634
 635   priv = engine->priv;
 636   return gtk_style_context_has_class (priv->context, style_class);
 637 }
 638
 639 /**
 640  * gtk_theming_engine_has_region:
 641  * @engine: a #GtkThemingEngine
 642  * @style_region: a region name
 643  * @flags: (out) (allow-none): return location for region flags
 644  *
 645  * Returns %TRUE if the currently rendered contents have the
 646  * region defined. If @flags_return is not %NULL, it is set
 647  * to the flags affecting the region.
 648  *
 649  * Returns: %TRUE if region is defined
 650  *
 651  * Since: 3.0
 652  **/
 653 gboolean
 654 gtk_theming_engine_has_region (GtkThemingEngine *engine,
 655                                const gchar      *style_region,
 656                                GtkRegionFlags   *flags)
 657 {
 658   GtkThemingEnginePrivate *priv;
 659
 660   if (flags)
 661     *flags = 0;
 662
 663   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 664
 665   priv = engine->priv;
 666   return gtk_style_context_has_region (priv->context, style_region, flags);
 667 }
 668
 669 /**
 670  * gtk_theming_engine_get_direction:
 671  * @engine: a #GtkThemingEngine
 672  *
 673  * Returns the widget direction used for rendering.
 674  *
 675  * Returns: the widget direction
 676  *
 677  * Since: 3.0
 678  **/
 679 GtkTextDirection
 680 gtk_theming_engine_get_direction (GtkThemingEngine *engine)
 681 {
 682   GtkThemingEnginePrivate *priv;
 683
 684   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), GTK_TEXT_DIR_LTR);
 685
 686   priv = engine->priv;
 687   return gtk_style_context_get_direction (priv->context);
 688 }
 689
 690 /**
 691  * gtk_theming_engine_get_junction_sides:
 692  * @engine: a #GtkThemingEngine
 693  *
 694  * Returns the widget direction used for rendering.
 695  *
 696  * Returns: the widget direction
 697  *
 698  * Since: 3.0
 699  **/
 700 GtkJunctionSides
 701 gtk_theming_engine_get_junction_sides (GtkThemingEngine *engine)
 702 {
 703   GtkThemingEnginePrivate *priv;
 704
 705   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 706
 707   priv = engine->priv;
 708   return gtk_style_context_get_junction_sides (priv->context);
 709 }
 710
 711 /**
 712  * gtk_theming_engine_get_color:
 713  * @engine: a #GtkThemingEngine
 714  * @state: state to retrieve the color for
 715  * @color: (out): return value for the foreground color
 716  *
 717  * Gets the foreground color for a given state.
 718  *
 719  * Since: 3.0
 720  **/
 721 void
 722 gtk_theming_engine_get_color (GtkThemingEngine *engine,
 723                               GtkStateFlags     state,
 724                               GdkRGBA          *color)
 725 {
 726   GtkThemingEnginePrivate *priv;
 727
 728   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 729
 730   priv = engine->priv;
 731   gtk_style_context_get_color (priv->context, state, color);
 732 }
 733
 734 /**
 735  * gtk_theming_engine_get_background_color:
 736  * @engine: a #GtkThemingEngine
 737  * @state: state to retrieve the color for
 738  * @color: (out): return value for the background color
 739  *
 740  * Gets the background color for a given state.
 741  *
 742  * Since: 3.0
 743  **/
 744 void
 745 gtk_theming_engine_get_background_color (GtkThemingEngine *engine,
 746                                          GtkStateFlags     state,
 747                                          GdkRGBA          *color)
 748 {
 749   GtkThemingEnginePrivate *priv;
 750
 751   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 752
 753   priv = engine->priv;
 754   gtk_style_context_get_background_color (priv->context, state, color);
 755 }
 756
 757 /**
 758  * gtk_theming_engine_get_border_color:
 759  * @engine: a #GtkThemingEngine
 760  * @state: state to retrieve the color for
 761  * @color: (out): return value for the border color
 762  *
 763  * Gets the border color for a given state.
 764  *
 765  * Since: 3.0
 766  **/
 767 void
 768 gtk_theming_engine_get_border_color (GtkThemingEngine *engine,
 769                                      GtkStateFlags     state,
 770                                      GdkRGBA          *color)
 771 {
 772   GtkThemingEnginePrivate *priv;
 773
 774   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 775
 776   priv = engine->priv;
 777   gtk_style_context_get_border_color (priv->context, state, color);
 778 }
 779
 780 /**
 781  * gtk_theming_engine_get_border:
 782  * @engine: a #GtkthemingEngine
 783  * @state: state to retrieve the border for
 784  * @border: (out): return value for the border settings
 785  *
 786  * Gets the border for a given state as a #GtkBorder.
 787  *
 788  * Since: 3.0
 789  **/
 790 void
 791 gtk_theming_engine_get_border (GtkThemingEngine *engine,
 792                                GtkStateFlags     state,
 793                                GtkBorder        *border)
 794 {
 795   GtkThemingEnginePrivate *priv;
 796
 797   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 798
 799   priv = engine->priv;
 800   gtk_style_context_get_border (priv->context, state, border);
 801 }
 802
 803 /**
 804  * gtk_theming_engine_get_padding:
 805  * @engine: a #GtkthemingEngine
 806  * @state: state to retrieve the padding for
 807  * @padding: (out): return value for the padding settings
 808  *
 809  * Gets the padding for a given state as a #GtkBorder.
 810  *
 811  * Since: 3.0
 812  **/
 813 void
 814 gtk_theming_engine_get_padding (GtkThemingEngine *engine,
 815                                 GtkStateFlags     state,
 816                                 GtkBorder        *padding)
 817 {
 818   GtkThemingEnginePrivate *priv;
 819
 820   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 821
 822   priv = engine->priv;
 823   gtk_style_context_get_padding (priv->context, state, padding);
 824 }
 825
 826 /**
 827  * gtk_theming_engine_get_margin:
 828  * @engine: a #GtkThemingEngine
 829  * @state: state to retrieve the border for
 830  * @margin: (out): return value for the margin settings
 831  *
 832  * Gets the margin for a given state as a #GtkBorder.
 833  *
 834  * Since: 3.0
 835  **/
 836 void
 837 gtk_theming_engine_get_margin (GtkThemingEngine *engine,
 838                                GtkStateFlags     state,
 839                                GtkBorder        *margin)
 840 {
 841   GtkThemingEnginePrivate *priv;
 842
 843   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 844
 845   priv = engine->priv;
 846   gtk_style_context_get_margin (priv->context, state, margin);
 847 }
 848
 849 /**
 850  * gtk_theming_engine_get_font:
 851  * @engine: a #GtkThemingEngine
 852  * @state: state to retrieve the font for
 853  *
 854  * Returns the font description for a given state.
 855  *
 856  * Returns: (transfer none): the #PangoFontDescription for the given
 857  *          state. This object is owned by GTK+ and should not be
 858  *          freed.
 859  *
 860  * Since: 3.0
 861  **/
 862 const PangoFontDescription *
 863 gtk_theming_engine_get_font (GtkThemingEngine *engine,
 864                              GtkStateFlags     state)
 865 {
 866   GtkThemingEnginePrivate *priv;
 867
 868   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 869
 870   priv = engine->priv;
 871   return gtk_style_context_get_font (priv->context, state);
 872 }
 873
 874 /* GtkThemingModule */
 875
 876 static gboolean
 877 gtk_theming_module_load (GTypeModule *type_module)
 878 {
 879   GtkThemingModule *theming_module;
 880   GModule *module;
 881   gchar *name, *module_path;
 882
 883   theming_module = GTK_THEMING_MODULE (type_module);
 884   name = theming_module->name;
 885   module_path = _gtk_find_module (name, "theming-engines");
 886
 887   if (!module_path)
 888     return FALSE;
 889
 890   module = g_module_open (module_path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 891   g_free (module_path);
 892
 893   if (!module)
 894     return FALSE;
 895
 896   if (!g_module_symbol (module, "theme_init",
 897                         (gpointer *) &theming_module->init) ||
 898       !g_module_symbol (module, "theme_exit",
 899                         (gpointer *) &theming_module->exit) ||
 900       !g_module_symbol (module, "create_engine",
 901                         (gpointer *) &theming_module->create_engine))
 902     {
 903       g_module_close (module);
 904
 905       return FALSE;
 906     }
 907
 908   theming_module->module = module;
 909
 910   theming_module->init (G_TYPE_MODULE (theming_module));
 911
 912   return TRUE;
 913 }
 914
 915 static void
 916 gtk_theming_module_unload (GTypeModule *type_module)
 917 {
 918   GtkThemingModule *theming_module;
 919
 920   theming_module = GTK_THEMING_MODULE (type_module);
 921
 922   theming_module->exit ();
 923
 924   g_module_close (theming_module->module);
 925
 926   theming_module->module = NULL;
 927   theming_module->init = NULL;
 928   theming_module->exit = NULL;
 929   theming_module->create_engine = NULL;
 930 }
 931
 932 static void
 933 gtk_theming_module_class_init (GtkThemingModuleClass *klass)
 934 {
 935   GTypeModuleClass *module_class = G_TYPE_MODULE_CLASS (klass);
 936
 937   module_class->load = gtk_theming_module_load;
 938   module_class->unload = gtk_theming_module_unload;
 939 }
 940
 941 static void
 942 gtk_theming_module_init (GtkThemingModule *module)
 943 {
 944 }
 945
 946 /**
 947  * gtk_theming_engine_load:
 948  * @name: Theme engine name to load
 949  *
 950  * Loads and initializes a theming engine module from the
 951  * standard directories.
 952  *
 953  * Returns: (transfer none): A theming engine, or %NULL if
 954  * the engine @name doesn't exist.
 955  **/
 956 GtkThemingEngine *
 957 gtk_theming_engine_load (const gchar *name)
 958 {
 959   static GHashTable *engines = NULL;
 960   static GtkThemingEngine *default_engine;
 961   GtkThemingEngine *engine = NULL;
 962
 963   if (name)
 964     {
 965       if (!engines)
 966         engines = g_hash_table_new (g_str_hash, g_str_equal);
 967
 968       engine = g_hash_table_lookup (engines, name);
 969
 970       if (!engine)
 971         {
 972           GtkThemingModule *module;
 973
 974           module = g_object_new (GTK_TYPE_THEMING_MODULE, NULL);
 975           g_type_module_set_name (G_TYPE_MODULE (module), name);
 976           module->name = g_strdup (name);
 977
 978           if (module && g_type_module_use (G_TYPE_MODULE (module)))
 979             {
 980               engine = (module->create_engine) ();
 981
 982               if (engine)
 983                 g_hash_table_insert (engines, module->name, engine);
 984             }
 985         }
 986     }
 987   else
 988     {
 989       if (G_UNLIKELY (!default_engine))
 990         default_engine = g_object_new (GTK_TYPE_THEMING_ENGINE, NULL);
 991
 992       engine = default_engine;
 993     }
 994
 995   return engine;
 996 }
 997
 998 /**
 999  * gtk_theming_engine_get_screen:
1000  * @engine: a #GtkThemingEngine
1001  *
1002  * Returns the #GdkScreen to which @engine currently rendering to.
1003  *
1004  * Returns: (transfer none): a #GdkScreen, or %NULL.
1005  **/
1006 GdkScreen *
1007 gtk_theming_engine_get_screen (GtkThemingEngine *engine)
1008 {
1009   GtkThemingEnginePrivate *priv;
1010
1011   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
1012
1013   priv = engine->priv;
1014   return gtk_style_context_get_screen (priv->context);
1015 }
1016
1017 /* Paint method implementations */
1018 static void
1019 gtk_theming_engine_render_check (GtkThemingEngine *engine,
1020                                  cairo_t          *cr,
1021                                  gdouble           x,
1022                                  gdouble           y,
1023                                  gdouble           width,
1024                                  gdouble           height)
1025 {
1026   GdkRGBA fg_color, bg_color;
1027   GtkStateFlags flags;
1028   gint exterior_size, interior_size, thickness, pad;
1029   GtkBorderStyle border_style;
1030   GtkBorder border;
1031   gint border_width;
1032   GtkThemingBackground bg;
1033
1034   _gtk_theming_background_init (&bg, engine,
1035                                 x, y,
1036                                 width, height,
1037                                 gtk_theming_engine_get_junction_sides (engine));
1038
1039   if (_gtk_theming_background_has_background_image (&bg))
1040     {
1041       _gtk_theming_background_render (&bg, cr);
1042       return;
1043     }
1044
1045   flags = gtk_theming_engine_get_state (engine);
1046   cairo_save (cr);
1047
1048   gtk_theming_engine_get_color (engine, flags, &fg_color);
1049   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1050   gtk_theming_engine_get_border (engine, flags, &border);
1051
1052   gtk_theming_engine_get (engine, flags,
1053                           "border-style", &border_style,
1054                           NULL);
1055
1056   border_width = MIN (MIN (border.top, border.bottom),
1057                       MIN (border.left, border.right));
1058   exterior_size = MIN (width, height);
1059
1060   if (exterior_size % 2 == 0) /* Ensure odd */
1061     exterior_size -= 1;
1062
1063   /* FIXME: thickness */
1064   thickness = 1;
1065   pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1066   interior_size = MAX (1, exterior_size - 2 * pad);
1067
1068   if (interior_size < 7)
1069     {
1070       interior_size = 7;
1071       pad = MAX (0, (exterior_size - interior_size) / 2);
1072     }
1073
1074   x -= (1 + exterior_size - (gint) width) / 2;
1075   y -= (1 + exterior_size - (gint) height) / 2;
1076
1077   if (border_style == GTK_BORDER_STYLE_SOLID)
1078     {
1079       GdkRGBA border_color;
1080
1081       cairo_set_line_width (cr, border_width);
1082       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1083
1084       cairo_rectangle (cr, x + 0.5, y + 0.5, exterior_size - 1, exterior_size - 1);
1085       gdk_cairo_set_source_rgba (cr, &bg_color);
1086       cairo_fill_preserve (cr);
1087
1088       gdk_cairo_set_source_rgba (cr, &border_color);
1089       cairo_stroke (cr);
1090     }
1091
1092   gdk_cairo_set_source_rgba (cr, &fg_color);
1093
1094   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1095     {
1096       int line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1097
1098       cairo_rectangle (cr,
1099                        x + pad,
1100                        y + pad + (1 + interior_size - line_thickness) / 2,
1101                        interior_size,
1102                        line_thickness);
1103       cairo_fill (cr);
1104     }
1105   else
1106     {
1107       gdouble progress;
1108       gboolean running;
1109
1110       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1111
1112       if ((flags & GTK_STATE_FLAG_ACTIVE) || running)
1113         {
1114           if (!running)
1115             progress = 1;
1116
1117           cairo_translate (cr,
1118                            x + pad, y + pad);
1119
1120           cairo_scale (cr, interior_size / 7., interior_size / 7.);
1121
1122           cairo_rectangle (cr, 0, 0, 7 * progress, 7);
1123           cairo_clip (cr);
1124
1125           cairo_move_to  (cr, 7.0, 0.0);
1126           cairo_line_to  (cr, 7.5, 1.0);
1127           cairo_curve_to (cr, 5.3, 2.0,
1128                           4.3, 4.0,
1129                           3.5, 7.0);
1130           cairo_curve_to (cr, 3.0, 5.7,
1131                           1.3, 4.7,
1132                           0.0, 4.7);
1133           cairo_line_to  (cr, 0.2, 3.5);
1134           cairo_curve_to (cr, 1.1, 3.5,
1135                           2.3, 4.3,
1136                           3.0, 5.0);
1137           cairo_curve_to (cr, 1.0, 3.9,
1138                           2.4, 4.1,
1139                           3.2, 4.9);
1140           cairo_curve_to (cr, 3.5, 3.1,
1141                           5.2, 2.0,
1142                           7.0, 0.0);
1143
1144           cairo_fill (cr);
1145         }
1146     }
1147
1148   cairo_restore (cr);
1149 }
1150
1151 static void
1152 gtk_theming_engine_render_option (GtkThemingEngine *engine,
1153                                   cairo_t          *cr,
1154                                   gdouble           x,
1155                                   gdouble           y,
1156                                   gdouble           width,
1157                                   gdouble           height)
1158 {
1159   GtkStateFlags flags;
1160   GdkRGBA fg_color, bg_color;
1161   gint exterior_size, interior_size, pad, thickness, border_width;
1162   GtkBorderStyle border_style;
1163   GtkBorder border;
1164   GtkThemingBackground bg;
1165
1166   _gtk_theming_background_init (&bg, engine,
1167                                 x, y,
1168                                 width, height,
1169                                 gtk_theming_engine_get_junction_sides (engine));
1170
1171   if (_gtk_theming_background_has_background_image (&bg))
1172     {
1173       _gtk_theming_background_render (&bg, cr);
1174       return;
1175     }
1176
1177   flags = gtk_theming_engine_get_state (engine);
1178
1179   cairo_save (cr);
1180
1181   gtk_theming_engine_get_color (engine, flags, &fg_color);
1182   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1183   gtk_theming_engine_get_border (engine, flags, &border);
1184
1185   gtk_theming_engine_get (engine, flags,
1186                           "border-style", &border_style,
1187                           NULL);
1188
1189   exterior_size = MIN (width, height);
1190   border_width = MIN (MIN (border.top, border.bottom),
1191                       MIN (border.left, border.right));
1192
1193   if (exterior_size % 2 == 0) /* Ensure odd */
1194     exterior_size -= 1;
1195
1196   x -= (1 + exterior_size - width) / 2;
1197   y -= (1 + exterior_size - height) / 2;
1198
1199   if (border_style == GTK_BORDER_STYLE_SOLID)
1200     {
1201       GdkRGBA border_color;
1202
1203       cairo_set_line_width (cr, border_width);
1204       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1205
1206       cairo_new_sub_path (cr);
1207       cairo_arc (cr,
1208                  x + exterior_size / 2.,
1209                  y + exterior_size / 2.,
1210                  (exterior_size - 1) / 2.,
1211                  0, 2 * G_PI);
1212
1213       gdk_cairo_set_source_rgba (cr, &bg_color);
1214       cairo_fill_preserve (cr);
1215
1216       gdk_cairo_set_source_rgba (cr, &border_color);
1217       cairo_stroke (cr);
1218     }
1219
1220   gdk_cairo_set_source_rgba (cr, &fg_color);
1221
1222   /* FIXME: thickness */
1223   thickness = 1;
1224
1225   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1226     {
1227       gint line_thickness;
1228
1229       pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1230       interior_size = MAX (1, exterior_size - 2 * pad);
1231
1232       if (interior_size < 7)
1233         {
1234           interior_size = 7;
1235           pad = MAX (0, (exterior_size - interior_size) / 2);
1236         }
1237
1238       line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1239
1240       cairo_rectangle (cr,
1241                        x + pad,
1242                        y + pad + (interior_size - line_thickness) / 2.,
1243                        interior_size,
1244                        line_thickness);
1245       cairo_fill (cr);
1246     }
1247   if (flags & GTK_STATE_FLAG_ACTIVE)
1248     {
1249       pad = thickness + MAX (1, 2 * (exterior_size - 2 * thickness) / 9);
1250       interior_size = MAX (1, exterior_size - 2 * pad);
1251
1252       if (interior_size < 5)
1253         {
1254           interior_size = 7;
1255           pad = MAX (0, (exterior_size - interior_size) / 2);
1256         }
1257
1258       cairo_new_sub_path (cr);
1259       cairo_arc (cr,
1260                  x + pad + interior_size / 2.,
1261                  y + pad + interior_size / 2.,
1262                  interior_size / 2.,
1263                  0, 2 * G_PI);
1264       cairo_fill (cr);
1265     }
1266
1267   cairo_restore (cr);
1268 }
1269
1270 static void
1271 add_path_arrow (cairo_t *cr,
1272                 gdouble  angle,
1273                 gdouble  x,
1274                 gdouble  y,
1275                 gdouble  size)
1276 {
1277   cairo_save (cr);
1278
1279   cairo_translate (cr, x + (size / 2), y + (size / 2));
1280   cairo_rotate (cr, angle);
1281
1282   cairo_move_to (cr, 0, - (size / 4));
1283   cairo_line_to (cr, - (size / 2), (size / 4));
1284   cairo_line_to (cr, (size / 2), (size / 4));
1285   cairo_close_path (cr);
1286
1287   cairo_restore (cr);
1288 }
1289
1290 static void
1291 gtk_theming_engine_render_arrow (GtkThemingEngine *engine,
1292                                  cairo_t          *cr,
1293                                  gdouble           angle,
1294                                  gdouble           x,
1295                                  gdouble           y,
1296                                  gdouble           size)
1297 {
1298   GtkStateFlags flags;
1299   GdkRGBA fg_color;
1300
1301   cairo_save (cr);
1302
1303   flags = gtk_theming_engine_get_state (engine);
1304   gtk_theming_engine_get_color (engine, flags, &fg_color);
1305
1306   if (flags & GTK_STATE_FLAG_INSENSITIVE)
1307     {
1308       add_path_arrow (cr, angle, x + 1, y + 1, size);
1309       cairo_set_source_rgb (cr, 1, 1, 1);
1310       cairo_fill (cr);
1311     }
1312
1313   add_path_arrow (cr, angle, x, y, size);
1314   gdk_cairo_set_source_rgba (cr, &fg_color);
1315   cairo_fill (cr);
1316
1317   cairo_restore (cr);
1318 }
1319
1320 static void
1321 add_path_line (cairo_t        *cr,
1322                gdouble         x1,
1323                gdouble         y1,
1324                gdouble         x2,
1325                gdouble         y2)
1326 {
1327   /* Adjust endpoints */
1328   if (y1 == y2)
1329     {
1330       y1 += 0.5;
1331       y2 += 0.5;
1332       x2 += 1;
1333     }
1334   else if (x1 == x2)
1335     {
1336       x1 += 0.5;
1337       x2 += 0.5;
1338       y2 += 1;
1339     }
1340
1341   cairo_move_to (cr, x1, y1);
1342   cairo_line_to (cr, x2, y2);
1343 }
1344
1345 static void
1346 color_shade (const GdkRGBA *color,
1347              gdouble        factor,
1348              GdkRGBA       *color_return)
1349 {
1350   GtkSymbolicColor *literal, *shade;
1351
1352   literal = gtk_symbolic_color_new_literal (color);
1353   shade = gtk_symbolic_color_new_shade (literal, factor);
1354   gtk_symbolic_color_unref (literal);
1355
1356   gtk_symbolic_color_resolve (shade, NULL, color_return);
1357   gtk_symbolic_color_unref (shade);
1358 }
1359
1360 static void
1361 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1362                                       cairo_t          *cr,
1363                                       gdouble           x,
1364                                       gdouble           y,
1365                                       gdouble           width,
1366                                       gdouble           height)
1367 {
1368   GtkThemingBackground bg;
1369
1370   _gtk_theming_background_init (&bg, engine,
1371                                 x, y,
1372                                 width, height,
1373                                 gtk_theming_engine_get_junction_sides (engine));
1374
1375   _gtk_theming_background_render (&bg, cr);
1376 }
1377
1378 static void
1379 gtk_theming_engine_hide_border_sides (GtkBorder *border,
1380                                       guint      hidden_side)
1381 {
1382   if (hidden_side & (1 << GTK_CSS_TOP))
1383     border->top = 0;
1384   if (hidden_side & (1 << GTK_CSS_RIGHT))
1385     border->right = 0;
1386   if (hidden_side & (1 << GTK_CSS_BOTTOM))
1387     border->bottom = 0;
1388   if (hidden_side & (1 << GTK_CSS_LEFT))
1389     border->left = 0;
1390 }
1391
1392 static void
1393 render_frame_fill (cairo_t       *cr,
1394                    GtkRoundedBox *border_box,
1395                    GtkBorder     *border,
1396                    GdkRGBA        colors[4],
1397                    guint          hidden_side)
1398 {
1399   GtkRoundedBox padding_box;
1400   guint i, j;
1401
1402   padding_box = *border_box;
1403   _gtk_rounded_box_shrink (&padding_box, border->top, border->right, border->bottom, border->left);
1404
1405   if (hidden_side == 0 &&
1406       gdk_rgba_equal (&colors[0], &colors[1]) &&
1407       gdk_rgba_equal (&colors[0], &colors[2]) &&
1408       gdk_rgba_equal (&colors[0], &colors[3]))
1409     {
1410       gdk_cairo_set_source_rgba (cr, &colors[0]);
1411
1412       _gtk_rounded_box_path (border_box, cr);
1413       _gtk_rounded_box_path (&padding_box, cr);
1414       cairo_fill (cr);
1415     }
1416   else
1417     {
1418       for (i = 0; i < 4; i++)
1419         {
1420           if (hidden_side & (1 << i))
1421             continue;
1422
1423           for (j = 0; j < 4; j++)
1424             {
1425               if (hidden_side & (1 << j))
1426                 continue;
1427
1428               if (i == j ||
1429                   (gdk_rgba_equal (&colors[i], &colors[j])))
1430                 {
1431                   /* We were already painted when i == j */
1432                   if (i > j)
1433                     break;
1434
1435                   if (j == 0)
1436                     _gtk_rounded_box_path_top (border_box, &padding_box, cr);
1437                   else if (j == 1)
1438                     _gtk_rounded_box_path_right (border_box, &padding_box, cr);
1439                   else if (j == 2)
1440                     _gtk_rounded_box_path_bottom (border_box, &padding_box, cr);
1441                   else if (j == 3)
1442                     _gtk_rounded_box_path_left (border_box, &padding_box, cr);
1443                 }
1444             }
1445           /* We were already painted when i == j */
1446           if (i > j)
1447             continue;
1448
1449           gdk_cairo_set_source_rgba (cr, &colors[i]);
1450
1451           cairo_fill (cr);
1452         }
1453     }
1454 }
1455
1456 static void
1457 set_stroke_style (cairo_t        *cr,
1458                   double          line_width,
1459                   GtkBorderStyle  style,
1460                   double          length)
1461 {
1462   double segments[2];
1463   double n;
1464
1465   cairo_set_line_width (cr, line_width);
1466
1467   if (style == GTK_BORDER_STYLE_DOTTED)
1468     {
1469       n = round (0.5 * length / line_width);
1470
1471       segments[0] = 0;
1472       segments[1] = n ? length / n : 2;
1473       cairo_set_dash (cr, segments, G_N_ELEMENTS (segments), 0);
1474
1475       cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
1476       cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
1477     }
1478   else
1479     {
1480       n = length / line_width;
1481       /* Optimize the common case of an integer-sized rectangle
1482        * Again, we care about focus rectangles.
1483        */
1484       if (n == nearbyint (n))
1485         {
1486           segments[0] = 1;
1487           segments[1] = 2;
1488         }
1489       else
1490         {
1491           n = round ((1. / 3) * n);
1492
1493           segments[0] = n ? (1. / 3) * length / n : 1;
1494           segments[1] = 2 * segments[1];
1495         }
1496       cairo_set_dash (cr, segments, G_N_ELEMENTS (segments), 0);
1497
1498       cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1499       cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
1500     }
1501 }
1502
1503 static int
1504 get_border_side (GtkBorder  *border,
1505                  GtkCssSide  side)
1506 {
1507   switch (side)
1508     {
1509     case GTK_CSS_TOP:
1510       return border->top;
1511     case GTK_CSS_RIGHT:
1512       return border->right;
1513     case GTK_CSS_BOTTOM:
1514       return border->bottom;
1515     case GTK_CSS_LEFT:
1516       return border->left;
1517     default:
1518       g_assert_not_reached ();
1519       return 0;
1520     }
1521 }
1522
1523 static void
1524 render_frame_stroke (cairo_t       *cr,
1525                      GtkRoundedBox *border_box,
1526                      GtkBorder     *border,
1527                      GdkRGBA        colors[4],
1528                      guint          hidden_side,
1529                      GtkBorderStyle stroke_style)
1530 {
1531   gboolean different_colors, different_borders;
1532   GtkRoundedBox stroke_box;
1533   guint i;
1534
1535   different_colors = !gdk_rgba_equal (&colors[0], &colors[1]) ||
1536                      !gdk_rgba_equal (&colors[0], &colors[2]) ||
1537                      !gdk_rgba_equal (&colors[0], &colors[3]);
1538   different_borders = border->top != border->right ||
1539                       border->top != border->bottom ||
1540                       border->top != border->left;
1541
1542   stroke_box = *border_box;
1543   _gtk_rounded_box_shrink (&stroke_box,
1544                            border->top / 2.0,
1545                            border->right / 2.0,
1546                            border->bottom / 2.0,
1547                            border->left / 2.0);
1548
1549   if (!different_colors && !different_borders && hidden_side == 0)
1550     {
1551       double length = 0;
1552
1553       /* FAST PATH:
1554        * Mostly expected to trigger for focus rectangles */
1555       for (i = 0; i < 4; i++)
1556         {
1557           length += _gtk_rounded_box_guess_length (&stroke_box, i);
1558           _gtk_rounded_box_path_side (&stroke_box, cr, i);
1559         }
1560
1561       gdk_cairo_set_source_rgba (cr, &colors[0]);
1562       set_stroke_style (cr, border->top, stroke_style, length);
1563       cairo_stroke (cr);
1564     }
1565   else
1566     {
1567       GtkRoundedBox padding_box;
1568
1569       padding_box = *border_box;
1570       _gtk_rounded_box_path (&padding_box, cr);
1571       _gtk_rounded_box_shrink (&padding_box,
1572                                border->top,
1573                                border->right,
1574                                border->bottom,
1575                                border->left);
1576
1577       for (i = 0; i < 4; i++)
1578         {
1579           if (hidden_side & (1 << i))
1580             continue;
1581
1582           cairo_save (cr);
1583
1584           if (i == 0)
1585             _gtk_rounded_box_path_top (border_box, &padding_box, cr);
1586           else if (i == 1)
1587             _gtk_rounded_box_path_right (border_box, &padding_box, cr);
1588           else if (i == 2)
1589             _gtk_rounded_box_path_bottom (border_box, &padding_box, cr);
1590           else if (i == 3)
1591             _gtk_rounded_box_path_left (border_box, &padding_box, cr);
1592           cairo_clip (cr);
1593
1594           _gtk_rounded_box_path_side (&stroke_box, cr, i);
1595
1596           gdk_cairo_set_source_rgba (cr, &colors[i]);
1597           set_stroke_style (cr,
1598                             get_border_side (border, i),
1599                             stroke_style,
1600                             _gtk_rounded_box_guess_length (&stroke_box, i));
1601           cairo_stroke (cr);
1602
1603           cairo_restore (cr);
1604         }
1605     }
1606 }
1607
1608 static void
1609 render_border (cairo_t       *cr,
1610                GtkRoundedBox *border_box,
1611                GtkBorder     *border,
1612                guint          hidden_side,
1613                GdkRGBA        colors[4],
1614                GtkBorderStyle border_style[4])
1615 {
1616   guint i, j;
1617
1618   cairo_save (cr);
1619
1620   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
1621
1622   for (i = 0; i < 4; i++)
1623     {
1624       if (hidden_side & (1 << i))
1625         continue;
1626
1627       switch (border_style[i])
1628         {
1629         case GTK_BORDER_STYLE_NONE:
1630         case GTK_BORDER_STYLE_HIDDEN:
1631         case GTK_BORDER_STYLE_SOLID:
1632           break;
1633         case GTK_BORDER_STYLE_INSET:
1634           if (i == 1 || i == 2)
1635             color_shade (&colors[i], 1.8, &colors[i]);
1636           break;
1637         case GTK_BORDER_STYLE_OUTSET:
1638           if (i == 0 || i == 3)
1639             color_shade (&colors[i], 1.8, &colors[i]);
1640           break;
1641         case GTK_BORDER_STYLE_DOTTED:
1642         case GTK_BORDER_STYLE_DASHED:
1643           {
1644             guint dont_draw = hidden_side;
1645
1646             for (j = 0; j < 4; j++)
1647               {
1648                 if (border_style[j] == border_style[i])
1649                   hidden_side |= (1 << j);
1650                 else
1651                   dont_draw |= (1 << j);
1652               }
1653
1654             render_frame_stroke (cr, border_box, border, colors, dont_draw, border_style[i]);
1655           }
1656           break;
1657         case GTK_BORDER_STYLE_DOUBLE:
1658           {
1659             GtkRoundedBox other_box;
1660             GtkBorder other_border;
1661             guint dont_draw = hidden_side;
1662
1663             for (j = 0; j < 4; j++)
1664               {
1665                 if (border_style[j] == GTK_BORDER_STYLE_DOUBLE)
1666                   hidden_side |= (1 << j);
1667                 else
1668                   dont_draw |= (1 << j);
1669               }
1670             other_border.top = (border->top + 2) / 3;
1671             other_border.right = (border->right + 2) / 3;
1672             other_border.bottom = (border->bottom + 2) / 3;
1673             other_border.left = (border->left + 2) / 3;
1674
1675             render_frame_fill (cr, border_box, &other_border, colors, dont_draw);
1676
1677             other_box = *border_box;
1678             _gtk_rounded_box_shrink (&other_box,
1679                                      border->top - other_border.top,
1680                                      border->right - other_border.right,
1681                                      border->bottom - other_border.bottom,
1682                                      border->left - other_border.left);
1683             render_frame_fill (cr, &other_box, &other_border, colors, dont_draw);
1684           }
1685         case GTK_BORDER_STYLE_GROOVE:
1686         case GTK_BORDER_STYLE_RIDGE:
1687           {
1688             GtkRoundedBox other_box;
1689             GdkRGBA other_colors[4];
1690             guint dont_draw = hidden_side;
1691             GtkBorder other_border;
1692
1693             for (j = 0; j < 4; j++)
1694               {
1695                 other_colors[j] = colors[j];
1696                 if ((j == 0 || j == 3) ^ (border_style[j] == GTK_BORDER_STYLE_RIDGE))
1697                   color_shade (&other_colors[j], 1.8, &other_colors[j]);
1698                 else
1699                   color_shade (&colors[j], 1.8, &colors[j]);
1700                 if (border_style[j] == GTK_BORDER_STYLE_GROOVE ||
1701                     border_style[j] == GTK_BORDER_STYLE_RIDGE)
1702                   hidden_side |= (1 << j);
1703                 else
1704                   dont_draw |= (1 << j);
1705               }
1706             other_border.top = border->top / 2;
1707             other_border.right = border->right / 2;
1708             other_border.bottom = border->bottom / 2;
1709             other_border.left = border->left / 2;
1710
1711             render_frame_fill (cr, border_box, &other_border, colors, dont_draw);
1712
1713             other_box = *border_box;
1714             _gtk_rounded_box_shrink (&other_box,
1715                                      other_border.top, other_border.right,
1716                                      other_border.bottom, other_border.left);
1717             other_border.top = border->top - other_border.top;
1718             other_border.right = border->right - other_border.right;
1719             other_border.bottom = border->bottom - other_border.bottom;
1720             other_border.left = border->left - other_border.left;
1721             render_frame_fill (cr, &other_box, &other_border, other_colors, dont_draw);
1722           }
1723           break;
1724         default:
1725           g_assert_not_reached ();
1726           break;
1727         }
1728     }
1729
1730   render_frame_fill (cr, border_box, border, colors, hidden_side);
1731
1732   cairo_restore (cr);
1733 }
1734
1735 static void
1736 render_frame_internal (GtkThemingEngine *engine,
1737                        cairo_t          *cr,
1738                        gdouble           x,
1739                        gdouble           y,
1740                        gdouble           width,
1741                        gdouble           height,
1742                        guint             hidden_side,
1743                        GtkJunctionSides  junction)
1744 {
1745   GtkBorderImage border_image;
1746   GtkStateFlags state;
1747   GtkBorderStyle border_style[4];
1748   GtkRoundedBox border_box;
1749   gdouble progress;
1750   gboolean running;
1751   GtkBorder border;
1752   GdkRGBA *alloc_colors[4];
1753   GdkRGBA colors[4];
1754   guint i;
1755
1756   state = gtk_theming_engine_get_state (engine);
1757
1758   gtk_theming_engine_get_border (engine, state, &border);
1759   gtk_theming_engine_hide_border_sides (&border, hidden_side);
1760
1761   if (_gtk_border_image_init (&border_image, engine))
1762     _gtk_border_image_render (&border_image, &border, cr, x, y, width, height);
1763   else
1764     {
1765       gtk_theming_engine_get (engine, state,
1766                               "border-top-style", &border_style[0],
1767                               "border-right-style", &border_style[1],
1768                               "border-bottom-style", &border_style[2],
1769                               "border-left-style", &border_style[3],
1770                               "border-top-color", &alloc_colors[0],
1771                               "border-right-color", &alloc_colors[1],
1772                               "border-bottom-color", &alloc_colors[2],
1773                               "border-left-color", &alloc_colors[3],
1774                               NULL);
1775
1776       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1777
1778       if (running)
1779         {
1780           GtkStateFlags other_state;
1781           GdkRGBA *other_colors[4];
1782
1783           if (state & GTK_STATE_FLAG_PRELIGHT)
1784             {
1785               other_state = state & ~(GTK_STATE_FLAG_PRELIGHT);
1786               progress = 1 - progress;
1787             }
1788           else
1789             other_state = state | GTK_STATE_FLAG_PRELIGHT;
1790
1791           gtk_theming_engine_get (engine, other_state,
1792                                   "border-top-color", &other_colors[0],
1793                                   "border-right-color", &other_colors[1],
1794                                   "border-bottom-color", &other_colors[2],
1795                                   "border-left-color", &other_colors[3],
1796                                   NULL);
1797
1798           for (i = 0; i < 4; i++)
1799             {
1800               colors[i].red = CLAMP (alloc_colors[i]->red + ((other_colors[i]->red - alloc_colors[i]->red) * progress), 0, 1);
1801               colors[i].green = CLAMP (alloc_colors[i]->green + ((other_colors[i]->green - alloc_colors[i]->green) * progress), 0, 1);
1802               colors[i].blue = CLAMP (alloc_colors[i]->blue + ((other_colors[i]->blue - alloc_colors[i]->blue) * progress), 0, 1);
1803               colors[i].alpha = CLAMP (alloc_colors[i]->alpha + ((other_colors[i]->alpha - alloc_colors[i]->alpha) * progress), 0, 1);
1804               gdk_rgba_free (other_colors[i]);
1805               gdk_rgba_free (alloc_colors[i]);
1806             }
1807         }
1808       else
1809         {
1810           for (i = 0; i < 4; i++)
1811             {
1812               colors[i] = *alloc_colors[i];
1813               gdk_rgba_free (alloc_colors[i]);
1814             }
1815         }
1816
1817       _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1818       _gtk_rounded_box_apply_border_radius_for_engine (&border_box, engine, state, junction);
1819
1820       render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1821     }
1822
1823   border_style[0] = _gtk_css_value_get_border_style (_gtk_theming_engine_peek_property (engine, "outline-style"));
1824   if (border_style[0] != GTK_BORDER_STYLE_NONE)
1825     {
1826       int offset;
1827
1828       border_style[1] = border_style[2] = border_style[3] = border_style[0];
1829       border.top = _gtk_css_value_get_int (_gtk_theming_engine_peek_property (engine, "outline-width"));
1830       border.left = border.right = border.bottom = border.top;
1831       colors[0] = *_gtk_css_value_get_rgba (_gtk_theming_engine_peek_property (engine, "outline-color"));
1832       colors[3] = colors[2] = colors[1] = colors[0];
1833       offset = _gtk_css_value_get_int (_gtk_theming_engine_peek_property (engine, "outline-offset"));
1834
1835       /* reinit box here - outlines don't have a border radius */
1836       _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1837       _gtk_rounded_box_shrink (&border_box,
1838                                - border.top - offset,
1839                                - border.right - offset,
1840                                - border.left - offset,
1841                                - border.bottom - offset);
1842
1843       render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1844     }
1845 }
1846
1847 static void
1848 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1849                                  cairo_t          *cr,
1850                                  gdouble           x,
1851                                  gdouble           y,
1852                                  gdouble           width,
1853                                  gdouble           height)
1854 {
1855   GtkJunctionSides junction;
1856
1857   junction = gtk_theming_engine_get_junction_sides (engine);
1858
1859   render_frame_internal (engine, cr,
1860                          x, y, width, height,
1861                          0, junction);
1862 }
1863
1864 static void
1865 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1866                                     cairo_t          *cr,
1867                                     gdouble           x,
1868                                     gdouble           y,
1869                                     gdouble           width,
1870                                     gdouble           height)
1871 {
1872   GtkStateFlags flags;
1873   GdkRGBA outline_color, fg_color;
1874   double vertical_overshoot;
1875   int diameter;
1876   double radius;
1877   double interp;                /* interpolation factor for center position */
1878   double x_double_horz, y_double_horz;
1879   double x_double_vert, y_double_vert;
1880   double x_double, y_double;
1881   gdouble angle;
1882   gint line_width;
1883   gboolean running, is_rtl;
1884   gdouble progress;
1885
1886   cairo_save (cr);
1887   flags = gtk_theming_engine_get_state (engine);
1888
1889   gtk_theming_engine_get_color (engine, flags, &fg_color);
1890   gtk_theming_engine_get_border_color (engine, flags, &outline_color);
1891
1892   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1893   is_rtl = (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL);
1894   line_width = 1;
1895
1896   if (!running)
1897     progress = (flags & GTK_STATE_FLAG_ACTIVE) ? 1 : 0;
1898
1899   if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_HORIZONTAL))
1900     {
1901       if (is_rtl)
1902         angle = (G_PI) - ((G_PI / 2) * progress);
1903       else
1904         angle = (G_PI / 2) * progress;
1905     }
1906   else
1907     {
1908       if (is_rtl)
1909         angle = (G_PI / 2) + ((G_PI / 2) * progress);
1910       else
1911         angle = (G_PI / 2) - ((G_PI / 2) * progress);
1912     }
1913
1914   interp = progress;
1915
1916   /* Compute distance that the stroke extends beyonds the end
1917    * of the triangle we draw.
1918    */
1919   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
1920
1921   /* For odd line widths, we end the vertical line of the triangle
1922    * at a half pixel, so we round differently.
1923    */
1924   if (line_width % 2 == 1)
1925     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
1926   else
1927     vertical_overshoot = ceil (vertical_overshoot);
1928
1929   /* Adjust the size of the triangle we draw so that the entire stroke fits
1930    */
1931   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
1932
1933   /* If the line width is odd, we want the diameter to be even,
1934    * and vice versa, so force the sum to be odd. This relationship
1935    * makes the point of the triangle look right.
1936    */
1937   diameter -= (1 - (diameter + line_width) % 2);
1938
1939   radius = diameter / 2.;
1940
1941   /* Adjust the center so that the stroke is properly aligned with
1942    * the pixel grid. The center adjustment is different for the
1943    * horizontal and vertical orientations. For intermediate positions
1944    * we interpolate between the two.
1945    */
1946   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1947   y_double_vert = (y + height / 2) - 0.5;
1948
1949   x_double_horz = (x + width / 2) - 0.5;
1950   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1951
1952   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
1953   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
1954
1955   cairo_translate (cr, x_double, y_double);
1956   cairo_rotate (cr, angle);
1957
1958   cairo_move_to (cr, - radius / 2., - radius);
1959   cairo_line_to (cr,   radius / 2.,   0);
1960   cairo_line_to (cr, - radius / 2.,   radius);
1961   cairo_close_path (cr);
1962
1963   cairo_set_line_width (cr, line_width);
1964
1965   gdk_cairo_set_source_rgba (cr, &fg_color);
1966
1967   cairo_fill_preserve (cr);
1968
1969   gdk_cairo_set_source_rgba (cr, &outline_color);
1970   cairo_stroke (cr);
1971
1972   cairo_restore (cr);
1973 }
1974
1975 static void
1976 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
1977                                  cairo_t          *cr,
1978                                  gdouble           x,
1979                                  gdouble           y,
1980                                  gdouble           width,
1981                                  gdouble           height)
1982 {
1983   GtkStateFlags flags;
1984   GdkRGBA color;
1985   gint line_width;
1986   gint8 *dash_list;
1987
1988   cairo_save (cr);
1989   flags = gtk_theming_engine_get_state (engine);
1990
1991   gtk_theming_engine_get_color (engine, flags, &color);
1992
1993   gtk_theming_engine_get_style (engine,
1994                                 "focus-line-width", &line_width,
1995                                 "focus-line-pattern", (gchar *) &dash_list,
1996                                 NULL);
1997
1998   cairo_set_line_width (cr, (gdouble) line_width);
1999
2000   if (dash_list[0])
2001     {
2002       gint n_dashes = strlen ((const gchar *) dash_list);
2003       gdouble *dashes = g_new (gdouble, n_dashes);
2004       gdouble total_length = 0;
2005       gdouble dash_offset;
2006       gint i;
2007
2008       for (i = 0; i < n_dashes; i++)
2009         {
2010           dashes[i] = dash_list[i];
2011           total_length += dash_list[i];
2012         }
2013
2014       /* The dash offset here aligns the pattern to integer pixels
2015        * by starting the dash at the right side of the left border
2016        * Negative dash offsets in cairo don't work
2017        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
2018        */
2019       dash_offset = - line_width / 2.;
2020
2021       while (dash_offset < 0)
2022         dash_offset += total_length;
2023
2024       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
2025       g_free (dashes);
2026     }
2027
2028   cairo_rectangle (cr,
2029                    x + line_width / 2.,
2030                    y + line_width / 2.,
2031                    width - line_width,
2032                    height - line_width);
2033
2034   gdk_cairo_set_source_rgba (cr, &color);
2035   cairo_stroke (cr);
2036
2037   cairo_restore (cr);
2038
2039   g_free (dash_list);
2040 }
2041
2042 static void
2043 gtk_theming_engine_render_line (GtkThemingEngine *engine,
2044                                 cairo_t          *cr,
2045                                 gdouble           x0,
2046                                 gdouble           y0,
2047                                 gdouble           x1,
2048                                 gdouble           y1)
2049 {
2050   GdkRGBA color;
2051   GtkStateFlags flags;
2052
2053   flags = gtk_theming_engine_get_state (engine);
2054   cairo_save (cr);
2055
2056   gtk_theming_engine_get_color (engine, flags, &color);
2057
2058   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
2059   cairo_set_line_width (cr, 1);
2060
2061   cairo_move_to (cr, x0 + 0.5, y0 + 0.5);
2062   cairo_line_to (cr, x1 + 0.5, y1 + 0.5);
2063
2064   gdk_cairo_set_source_rgba (cr, &color);
2065   cairo_stroke (cr);
2066
2067   cairo_restore (cr);
2068 }
2069
2070 static void
2071 prepare_context_for_layout (cairo_t *cr,
2072                             gdouble x,
2073                             gdouble y,
2074                             PangoLayout *layout)
2075 {
2076   const PangoMatrix *matrix;
2077
2078   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2079
2080   cairo_move_to (cr, x, y);
2081
2082   if (matrix)
2083     {
2084       cairo_matrix_t cairo_matrix;
2085
2086       cairo_matrix_init (&cairo_matrix,
2087                          matrix->xx, matrix->yx,
2088                          matrix->xy, matrix->yy,
2089                          matrix->x0, matrix->y0);
2090
2091       cairo_transform (cr, &cairo_matrix);
2092     }
2093 }
2094
2095 static void
2096 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2097                                   cairo_t          *cr,
2098                                   gdouble           x,
2099                                   gdouble           y,
2100                                   PangoLayout      *layout)
2101 {
2102   GdkRGBA fg_color;
2103   GtkShadow *text_shadow = NULL;
2104   GtkStateFlags flags;
2105   gdouble progress;
2106   gboolean running;
2107
2108   cairo_save (cr);
2109   flags = gtk_theming_engine_get_state (engine);
2110   gtk_theming_engine_get_color (engine, flags, &fg_color);
2111
2112   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
2113
2114   if (running)
2115     {
2116       GtkStateFlags other_flags;
2117       GdkRGBA other_fg;
2118
2119       if (flags & GTK_STATE_FLAG_PRELIGHT)
2120         {
2121           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
2122           progress = 1 - progress;
2123         }
2124       else
2125         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
2126
2127       gtk_theming_engine_get_color (engine, other_flags, &other_fg);
2128
2129       fg_color.red = CLAMP (fg_color.red + ((other_fg.red - fg_color.red) * progress), 0, 1);
2130       fg_color.green = CLAMP (fg_color.green + ((other_fg.green - fg_color.green) * progress), 0, 1);
2131       fg_color.blue = CLAMP (fg_color.blue + ((other_fg.blue - fg_color.blue) * progress), 0, 1);
2132       fg_color.alpha = CLAMP (fg_color.alpha + ((other_fg.alpha - fg_color.alpha) * progress), 0, 1);
2133     }
2134
2135   gtk_theming_engine_get (engine, flags,
2136                           "text-shadow", &text_shadow,
2137                           NULL);
2138
2139   prepare_context_for_layout (cr, x, y, layout);
2140
2141   if (text_shadow != NULL)
2142     {
2143       _gtk_text_shadow_paint_layout (text_shadow, cr, layout);
2144       _gtk_shadow_unref (text_shadow);
2145     }
2146
2147   gdk_cairo_set_source_rgba (cr, &fg_color);
2148   pango_cairo_show_layout (cr, layout);
2149
2150   cairo_restore (cr);
2151 }
2152
2153 static void
2154 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2155                                   cairo_t          *cr,
2156                                   gdouble           x,
2157                                   gdouble           y,
2158                                   gdouble           width,
2159                                   gdouble           height,
2160                                   GtkOrientation    orientation)
2161 {
2162   const GtkWidgetPath *path;
2163   gint thickness;
2164
2165   path = gtk_theming_engine_get_path (engine);
2166
2167   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2168   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2169
2170   /* FIXME: thickness */
2171   thickness = 2;
2172
2173   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
2174     {
2175       if (orientation == GTK_ORIENTATION_VERTICAL)
2176         gtk_theming_engine_render_line (engine, cr,
2177                                         x + thickness,
2178                                         y + (gint) height / 2,
2179                                         x + width - thickness - 1,
2180                                         y + (gint) height / 2);
2181       else
2182         gtk_theming_engine_render_line (engine, cr,
2183                                         x + (gint) width / 2,
2184                                         y + thickness,
2185                                         x + (gint) width / 2,
2186                                         y + height - thickness - 1);
2187     }
2188 }
2189
2190 static void
2191 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2192                                      cairo_t          *cr,
2193                                      gdouble           x,
2194                                      gdouble           y,
2195                                      gdouble           width,
2196                                      gdouble           height,
2197                                      GtkPositionType   gap_side,
2198                                      gdouble           xy0_gap,
2199                                      gdouble           xy1_gap)
2200 {
2201   GtkJunctionSides junction;
2202   GtkStateFlags state;
2203   gint border_width;
2204   GtkCssBorderCornerRadius *top_left_radius, *top_right_radius;
2205   GtkCssBorderCornerRadius *bottom_left_radius, *bottom_right_radius;
2206   gdouble x0, y0, x1, y1, xc, yc, wc, hc;
2207   GtkBorder border;
2208
2209   xc = yc = wc = hc = 0;
2210   state = gtk_theming_engine_get_state (engine);
2211   junction = gtk_theming_engine_get_junction_sides (engine);
2212
2213   gtk_theming_engine_get_border (engine, state, &border);
2214   gtk_theming_engine_get (engine, state,
2215                           "border-top-left-radius", &top_left_radius,
2216                           "border-top-right-radius", &top_right_radius,
2217                           "border-bottom-right-radius", &bottom_right_radius,
2218                           "border-bottom-left-radius", &bottom_left_radius,
2219                           NULL);
2220
2221   border_width = MIN (MIN (border.top, border.bottom),
2222                       MIN (border.left, border.right));
2223
2224   cairo_save (cr);
2225
2226   switch (gap_side)
2227     {
2228     case GTK_POS_TOP:
2229       xc = x + xy0_gap + border_width;
2230       yc = y;
2231       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2232       hc = border_width;
2233
2234       if (xy0_gap < _gtk_css_number_get (&top_left_radius->horizontal, width))
2235         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2236
2237       if (xy1_gap > width - _gtk_css_number_get (&top_right_radius->horizontal, width))
2238         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2239       break;
2240     case GTK_POS_BOTTOM:
2241       xc = x + xy0_gap + border_width;
2242       yc = y + height - border_width;
2243       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2244       hc = border_width;
2245
2246       if (xy0_gap < _gtk_css_number_get (&bottom_left_radius->horizontal, width))
2247         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2248
2249       if (xy1_gap > width - _gtk_css_number_get (&bottom_right_radius->horizontal, width))
2250         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2251
2252       break;
2253     case GTK_POS_LEFT:
2254       xc = x;
2255       yc = y + xy0_gap + border_width;
2256       wc = border_width;
2257       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2258
2259       if (xy0_gap < _gtk_css_number_get (&top_left_radius->vertical, height))
2260         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2261
2262       if (xy1_gap > height - _gtk_css_number_get (&bottom_left_radius->vertical, height))
2263         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2264
2265       break;
2266     case GTK_POS_RIGHT:
2267       xc = x + width - border_width;
2268       yc = y + xy0_gap + border_width;
2269       wc = border_width;
2270       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2271
2272       if (xy0_gap < _gtk_css_number_get (&top_right_radius->vertical, height))
2273         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2274
2275       if (xy1_gap > height - _gtk_css_number_get (&bottom_right_radius->vertical, height))
2276         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2277
2278       break;
2279     }
2280
2281   cairo_clip_extents (cr, &x0, &y0, &x1, &y1);
2282   cairo_rectangle (cr, x0, y0, x1 - x0, yc - y0);
2283   cairo_rectangle (cr, x0, yc, xc - x0, hc);
2284   cairo_rectangle (cr, xc + wc, yc, x1 - (xc + wc), hc);
2285   cairo_rectangle (cr, x0, yc + hc, x1 - x0, y1 - (yc + hc));
2286   cairo_clip (cr);
2287
2288   render_frame_internal (engine, cr,
2289                          x, y, width, height,
2290                          0, junction);
2291
2292   cairo_restore (cr);
2293
2294   g_free (top_left_radius);
2295   g_free (top_right_radius);
2296   g_free (bottom_right_radius);
2297   g_free (bottom_left_radius);
2298 }
2299
2300 static void
2301 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2302                                      cairo_t          *cr,
2303                                      gdouble           x,
2304                                      gdouble           y,
2305                                      gdouble           width,
2306                                      gdouble           height,
2307                                      GtkPositionType   gap_side)
2308 {
2309   GtkThemingBackground bg;
2310   GtkJunctionSides junction = 0;
2311   guint hidden_side = 0;
2312
2313   cairo_save (cr);
2314
2315   switch (gap_side)
2316     {
2317     case GTK_POS_LEFT:
2318       junction = GTK_JUNCTION_LEFT;
2319       hidden_side = (1 << GTK_CSS_LEFT);
2320
2321       cairo_translate (cr, x + width, y);
2322       cairo_rotate (cr, G_PI / 2);
2323       break;
2324     case GTK_POS_RIGHT:
2325       junction = GTK_JUNCTION_RIGHT;
2326       hidden_side = (1 << GTK_CSS_RIGHT);
2327
2328       cairo_translate (cr, x, y + height);
2329       cairo_rotate (cr, - G_PI / 2);
2330       break;
2331     case GTK_POS_TOP:
2332       junction = GTK_JUNCTION_TOP;
2333       hidden_side = (1 << GTK_CSS_TOP);
2334
2335       cairo_translate (cr, x + width, y + height);
2336       cairo_rotate (cr, G_PI);
2337       break;
2338     case GTK_POS_BOTTOM:
2339       junction = GTK_JUNCTION_BOTTOM;
2340       hidden_side = (1 << GTK_CSS_BOTTOM);
2341
2342       cairo_translate (cr, x, y);
2343       break;
2344     }
2345
2346   if (gap_side == GTK_POS_TOP ||
2347       gap_side == GTK_POS_BOTTOM)
2348     _gtk_theming_background_init (&bg, engine,
2349                                   0, 0,
2350                                   width, height,
2351                                   GTK_JUNCTION_BOTTOM);
2352   else
2353     _gtk_theming_background_init (&bg, engine,
2354                                   0, 0,
2355                                   height, width,
2356                                   GTK_JUNCTION_BOTTOM);
2357
2358   _gtk_theming_background_render (&bg, cr);
2359
2360   cairo_restore (cr);
2361
2362   cairo_save (cr);
2363
2364   render_frame_internal (engine, cr,
2365                          x, y, width, height,
2366                          hidden_side, junction);
2367
2368   cairo_restore (cr);
2369 }
2370
2371 static void
2372 render_dot (cairo_t       *cr,
2373             const GdkRGBA *lighter,
2374             const GdkRGBA *darker,
2375             gdouble        x,
2376             gdouble        y,
2377             gdouble        size)
2378 {
2379   size = CLAMP ((gint) size, 2, 3);
2380
2381   if (size == 2)
2382     {
2383       gdk_cairo_set_source_rgba (cr, lighter);
2384       cairo_rectangle (cr, x, y, 1, 1);
2385       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2386       cairo_fill (cr);
2387     }
2388   else if (size == 3)
2389     {
2390       gdk_cairo_set_source_rgba (cr, lighter);
2391       cairo_rectangle (cr, x, y, 2, 1);
2392       cairo_rectangle (cr, x, y, 1, 2);
2393       cairo_fill (cr);
2394
2395       gdk_cairo_set_source_rgba (cr, darker);
2396       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2397       cairo_rectangle (cr, x + 2, y, 1, 2);
2398       cairo_fill (cr);
2399     }
2400 }
2401
2402 static void
2403 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2404                                   cairo_t          *cr,
2405                                   gdouble           x,
2406                                   gdouble           y,
2407                                   gdouble           width,
2408                                   gdouble           height)
2409 {
2410   GtkStateFlags flags;
2411   GdkRGBA bg_color, lighter, darker;
2412   GtkJunctionSides sides;
2413   GtkThemingBackground bg;
2414   gint xx, yy;
2415
2416   cairo_save (cr);
2417   flags = gtk_theming_engine_get_state (engine);
2418
2419   cairo_set_line_width (cr, 1.0);
2420   sides = gtk_theming_engine_get_junction_sides (engine);
2421   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2422
2423   color_shade (&bg_color, 0.7, &darker);
2424   color_shade (&bg_color, 1.3, &lighter);
2425
2426   _gtk_theming_background_init (&bg, engine, x, y, width, height, sides);
2427   _gtk_theming_background_render (&bg, cr);
2428
2429   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_GRIP))
2430     {
2431       /* reduce confusing values to a meaningful state */
2432       if ((sides & (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)) == (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT))
2433         sides &= ~GTK_JUNCTION_CORNER_TOPLEFT;
2434
2435       if ((sides & (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT)) == (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT))
2436         sides &= ~GTK_JUNCTION_CORNER_TOPRIGHT;
2437
2438       if (sides == 0)
2439         sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2440
2441       /* align drawing area to the connected side */
2442       if (sides == GTK_JUNCTION_LEFT)
2443         {
2444           if (height < width)
2445             width = height;
2446         }
2447       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2448         {
2449           if (width < height)
2450             height = width;
2451           else if (height < width)
2452             width = height;
2453         }
2454       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2455         {
2456           /* make it square, aligning to bottom left */
2457           if (width < height)
2458             {
2459               y += (height - width);
2460               height = width;
2461             }
2462           else if (height < width)
2463             width = height;
2464         }
2465       else if (sides == GTK_JUNCTION_RIGHT)
2466         {
2467           /* aligning to right */
2468           if (height < width)
2469             {
2470               x += (width - height);
2471               width = height;
2472             }
2473         }
2474       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2475         {
2476           if (width < height)
2477             height = width;
2478           else if (height < width)
2479             {
2480               x += (width - height);
2481               width = height;
2482             }
2483         }
2484       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2485         {
2486           /* make it square, aligning to bottom right */
2487           if (width < height)
2488             {
2489               y += (height - width);
2490               height = width;
2491             }
2492           else if (height < width)
2493             {
2494               x += (width - height);
2495               width = height;
2496             }
2497         }
2498       else if (sides == GTK_JUNCTION_TOP)
2499         {
2500           if (width < height)
2501             height = width;
2502         }
2503       else if (sides == GTK_JUNCTION_BOTTOM)
2504         {
2505           /* align to bottom */
2506           if (width < height)
2507             {
2508               y += (height - width);
2509               height = width;
2510             }
2511         }
2512       else
2513         g_assert_not_reached ();
2514
2515       if (sides == GTK_JUNCTION_LEFT ||
2516           sides == GTK_JUNCTION_RIGHT)
2517         {
2518           gint xi;
2519
2520           xi = x;
2521
2522           while (xi < x + width)
2523             {
2524               gdk_cairo_set_source_rgba (cr, &lighter);
2525               add_path_line (cr, x, y, x, y + height);
2526               cairo_stroke (cr);
2527               xi++;
2528
2529               gdk_cairo_set_source_rgba (cr, &darker);
2530               add_path_line (cr, xi, y, xi, y + height);
2531               cairo_stroke (cr);
2532               xi += 2;
2533             }
2534         }
2535       else if (sides == GTK_JUNCTION_TOP ||
2536                sides == GTK_JUNCTION_BOTTOM)
2537         {
2538           gint yi;
2539
2540           yi = y;
2541
2542           while (yi < y + height)
2543             {
2544               gdk_cairo_set_source_rgba (cr, &lighter);
2545               add_path_line (cr, x, yi, x + width, yi);
2546               cairo_stroke (cr);
2547               yi++;
2548
2549               gdk_cairo_set_source_rgba (cr, &darker);
2550               add_path_line (cr, x, yi, x + width, yi);
2551               cairo_stroke (cr);
2552               yi += 2;
2553             }
2554         }
2555       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2556         {
2557           gint xi, yi;
2558
2559           xi = x + width;
2560           yi = y + height;
2561
2562           while (xi > x + 3)
2563             {
2564               gdk_cairo_set_source_rgba (cr, &darker);
2565               add_path_line (cr, xi, y, x, yi);
2566               cairo_stroke (cr);
2567
2568               --xi;
2569               --yi;
2570
2571               add_path_line (cr, xi, y, x, yi);
2572               cairo_stroke (cr);
2573
2574               --xi;
2575               --yi;
2576
2577               gdk_cairo_set_source_rgba (cr, &lighter);
2578               add_path_line (cr, xi, y, x, yi);
2579               cairo_stroke (cr);
2580
2581               xi -= 3;
2582               yi -= 3;
2583             }
2584         }
2585       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2586         {
2587           gint xi, yi;
2588
2589           xi = x;
2590           yi = y + height;
2591
2592           while (xi < (x + width - 3))
2593             {
2594               gdk_cairo_set_source_rgba (cr, &lighter);
2595               add_path_line (cr, xi, y, x + width, yi);
2596               cairo_stroke (cr);
2597
2598               ++xi;
2599               --yi;
2600
2601               gdk_cairo_set_source_rgba (cr, &darker);
2602               add_path_line (cr, xi, y, x + width, yi);
2603               cairo_stroke (cr);
2604
2605               ++xi;
2606               --yi;
2607
2608               add_path_line (cr, xi, y, x + width, yi);
2609               cairo_stroke (cr);
2610
2611               xi += 3;
2612               yi -= 3;
2613             }
2614         }
2615       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2616         {
2617           gint xi, yi;
2618
2619           xi = x + width;
2620           yi = y;
2621
2622           while (xi > x + 3)
2623             {
2624               gdk_cairo_set_source_rgba (cr, &darker);
2625               add_path_line (cr, x, yi, xi, y + height);
2626               cairo_stroke (cr);
2627
2628               --xi;
2629               ++yi;
2630
2631               add_path_line (cr, x, yi, xi, y + height);
2632               cairo_stroke (cr);
2633
2634               --xi;
2635               ++yi;
2636
2637               gdk_cairo_set_source_rgba (cr, &lighter);
2638               add_path_line (cr, x, yi, xi, y + height);
2639               cairo_stroke (cr);
2640
2641               xi -= 3;
2642               yi += 3;
2643             }
2644         }
2645       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2646         {
2647           gint xi, yi;
2648
2649           xi = x;
2650           yi = y;
2651
2652           while (xi < (x + width - 3))
2653             {
2654               gdk_cairo_set_source_rgba (cr, &lighter);
2655               add_path_line (cr, xi, y + height, x + width, yi);
2656               cairo_stroke (cr);
2657
2658               ++xi;
2659               ++yi;
2660
2661               gdk_cairo_set_source_rgba (cr, &darker);
2662               add_path_line (cr, xi, y + height, x + width, yi);
2663               cairo_stroke (cr);
2664
2665               ++xi;
2666               ++yi;
2667
2668               add_path_line (cr, xi, y + height, x + width, yi);
2669               cairo_stroke (cr);
2670
2671               xi += 3;
2672               yi += 3;
2673             }
2674         }
2675     }
2676   else if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_PANE_SEPARATOR))
2677     {
2678       if (width > height)
2679         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2680           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2681       else
2682         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2683           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2684     }
2685   else
2686     {
2687       for (yy = y; yy < y + height; yy += 3)
2688         for (xx = x; xx < x + width; xx += 6)
2689           {
2690             render_dot (cr, &lighter, &darker, xx, yy, 2);
2691             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2692           }
2693     }
2694
2695   cairo_restore (cr);
2696 }
2697
2698 void
2699 _gtk_theming_engine_paint_spinner (cairo_t *cr,
2700                                    gdouble  radius,
2701                                    gdouble  progress,
2702                                    GdkRGBA *color)
2703 {
2704   guint num_steps, step;
2705   gdouble half;
2706   gint i;
2707
2708   num_steps = 12;
2709
2710   if (progress >= 0)
2711     step = (guint) (progress * num_steps);
2712   else
2713     step = 0;
2714
2715   cairo_save (cr);
2716
2717   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2718   cairo_set_line_width (cr, 2.0);
2719
2720   half = num_steps / 2;
2721
2722   for (i = 0; i < num_steps; i++)
2723     {
2724       gint inset = 0.7 * radius;
2725
2726       /* transparency is a function of time and intial value */
2727       gdouble t = 1.0 - (gdouble) ((i + step) % num_steps) / num_steps;
2728       gdouble xscale = - sin (i * G_PI / half);
2729       gdouble yscale = - cos (i * G_PI / half);
2730
2731       cairo_set_source_rgba (cr,
2732                              color->red,
2733                              color->green,
2734                              color->blue,
2735                              color->alpha * t);
2736
2737       cairo_move_to (cr,
2738                      (radius - inset) * xscale,
2739                      (radius - inset) * yscale);
2740       cairo_line_to (cr,
2741                      radius * xscale,
2742                      radius * yscale);
2743
2744       cairo_stroke (cr);
2745     }
2746
2747   cairo_restore (cr);
2748 }
2749
2750 static void
2751 render_spinner (GtkThemingEngine *engine,
2752                 cairo_t          *cr,
2753                 gdouble           x,
2754                 gdouble           y,
2755                 gdouble           width,
2756                 gdouble           height)
2757 {
2758   GtkStateFlags state;
2759   GtkShadow *shadow;
2760   GdkRGBA color;
2761   gdouble progress;
2762   gdouble radius;
2763
2764   state = gtk_theming_engine_get_state (engine);
2765
2766   if (!gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
2767     progress = -1;
2768
2769   radius = MIN (width / 2, height / 2);
2770
2771   gtk_theming_engine_get_color (engine, state, &color);
2772   gtk_theming_engine_get (engine, state,
2773                           "icon-shadow", &shadow,
2774                           NULL);
2775
2776   cairo_save (cr);
2777   cairo_translate (cr, x + width / 2, y + height / 2);
2778
2779   if (shadow != NULL)
2780     {
2781       _gtk_icon_shadow_paint_spinner (shadow, cr,
2782                                       radius,
2783                                       progress);
2784       _gtk_shadow_unref (shadow);
2785     }
2786
2787   _gtk_theming_engine_paint_spinner (cr,
2788                                      radius,
2789                                      progress,
2790                                      &color);
2791
2792   cairo_restore (cr);
2793 }
2794
2795 static void
2796 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2797                                     cairo_t          *cr,
2798                                     gdouble           x,
2799                                     gdouble           y,
2800                                     gdouble           width,
2801                                     gdouble           height)
2802 {
2803   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
2804     {
2805       render_spinner (engine, cr, x, y, width, height);
2806     }
2807   else
2808     {
2809       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2810       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2811     }
2812 }
2813
2814 static GdkPixbuf *
2815 scale_or_ref (GdkPixbuf *src,
2816               gint       width,
2817               gint       height)
2818 {
2819   if (width == gdk_pixbuf_get_width (src) &&
2820       height == gdk_pixbuf_get_height (src))
2821     return g_object_ref (src);
2822   else
2823     return gdk_pixbuf_scale_simple (src,
2824                                     width, height,
2825                                     GDK_INTERP_BILINEAR);
2826 }
2827
2828 static gboolean
2829 lookup_icon_size (GtkThemingEngine *engine,
2830                   GtkIconSize       size,
2831                   gint             *width,
2832                   gint             *height)
2833 {
2834   GdkScreen *screen;
2835   GtkSettings *settings;
2836
2837   screen = gtk_theming_engine_get_screen (engine);
2838   settings = gtk_settings_get_for_screen (screen);
2839
2840   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
2841 }
2842
2843 static void
2844 colorshift_source (cairo_t *cr,
2845                    gdouble shift)
2846 {
2847   cairo_pattern_t *source;
2848
2849   cairo_save (cr);
2850   cairo_paint (cr);
2851
2852   source = cairo_pattern_reference (cairo_get_source (cr));
2853
2854   cairo_set_source_rgb (cr, shift, shift, shift);
2855   cairo_set_operator (cr, CAIRO_OPERATOR_COLOR_DODGE);
2856
2857   cairo_mask (cr, source);
2858
2859   cairo_pattern_destroy (source);
2860   cairo_restore (cr);
2861 }
2862
2863 static GdkPixbuf *
2864 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
2865                                        const GtkIconSource *source,
2866                                        GtkIconSize          size)
2867 {
2868   GdkPixbuf *scaled;
2869   GdkPixbuf *stated;
2870   GdkPixbuf *base_pixbuf;
2871   GtkStateFlags state;
2872   gint width = 1;
2873   gint height = 1;
2874   cairo_t *cr;
2875   cairo_surface_t *surface;
2876
2877   base_pixbuf = gtk_icon_source_get_pixbuf (source);
2878   state = gtk_theming_engine_get_state (engine);
2879
2880   g_return_val_if_fail (base_pixbuf != NULL, NULL);
2881
2882   if (size != (GtkIconSize) -1 &&
2883       !lookup_icon_size (engine, size, &width, &height))
2884     {
2885       g_warning (G_STRLOC ": invalid icon size '%d'", size);
2886       return NULL;
2887     }
2888
2889   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
2890    * leave it alone.
2891    */
2892   if (size != (GtkIconSize) -1 &&
2893       gtk_icon_source_get_size_wildcarded (source))
2894     scaled = scale_or_ref (base_pixbuf, width, height);
2895   else
2896     scaled = g_object_ref (base_pixbuf);
2897
2898   /* If the state was wildcarded, then generate a state. */
2899   if (gtk_icon_source_get_state_wildcarded (source))
2900     {
2901       if (state & GTK_STATE_FLAG_INSENSITIVE)
2902         {
2903           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2904                                                 gdk_pixbuf_get_width (scaled),
2905                                                 gdk_pixbuf_get_height (scaled));
2906           cr = cairo_create (surface);
2907           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2908           cairo_paint_with_alpha (cr, 0.5);
2909
2910           cairo_destroy (cr);
2911
2912           g_object_unref (scaled);
2913           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2914                                                 cairo_image_surface_get_width (surface),
2915                                                 cairo_image_surface_get_height (surface));
2916           cairo_surface_destroy (surface);
2917         }
2918       else if (state & GTK_STATE_FLAG_PRELIGHT)
2919         {
2920           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2921                                                 gdk_pixbuf_get_width (scaled),
2922                                                 gdk_pixbuf_get_height (scaled));
2923
2924           cr = cairo_create (surface);
2925           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2926           colorshift_source (cr, 0.10);
2927
2928           cairo_destroy (cr);
2929
2930           g_object_unref (scaled);
2931           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2932                                                 cairo_image_surface_get_width (surface),
2933                                                 cairo_image_surface_get_height (surface));
2934           cairo_surface_destroy (surface);
2935         }
2936       else
2937         stated = scaled;
2938     }
2939   else
2940     stated = scaled;
2941
2942   return stated;
2943 }
2944
2945 static void
2946 gtk_theming_engine_render_icon (GtkThemingEngine *engine,
2947                                 cairo_t *cr,
2948                                 GdkPixbuf *pixbuf,
2949                                 gdouble x,
2950                                 gdouble y)
2951 {
2952   GtkStateFlags state;
2953   GtkShadow *icon_shadow;
2954
2955   state = gtk_theming_engine_get_state (engine);
2956
2957   cairo_save (cr);
2958
2959   gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
2960
2961   gtk_theming_engine_get (engine, state,
2962                           "icon-shadow", &icon_shadow,
2963                           NULL);
2964
2965   if (icon_shadow != NULL)
2966     {
2967       _gtk_icon_shadow_paint (icon_shadow, cr);
2968       _gtk_shadow_unref (icon_shadow);
2969     }
2970
2971   cairo_paint (cr);
2972
2973   cairo_restore (cr);
2974 }
2975