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

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "config.h"
  19
  20 #include <math.h>
  21 #include <gtk/gtk.h>
  22
  23 #include <gtk/gtkthemingengine.h>
  24 #include <gtk/gtkstylecontext.h>
  25 #include <gtk/gtkintl.h>
  26
  27 #include "gtkprivate.h"
  28 #include "gtkmodulesprivate.h"
  29 #include "gtkborderimageprivate.h"
  30 #include "gtkpango.h"
  31 #include "gtkcssarrayvalueprivate.h"
  32 #include "gtkcsscornervalueprivate.h"
  33 #include "gtkcssenumvalueprivate.h"
  34 #include "gtkcssnumbervalueprivate.h"
  35 #include "gtkcssrgbavalueprivate.h"
  36 #include "gtkcssshadowsvalueprivate.h"
  37 #include "gtkcsstypesprivate.h"
  38 #include "gtkthemingengineprivate.h"
  39 #include "gtkroundedboxprivate.h"
  40 #include "gtkthemingbackgroundprivate.h"
  41
  42 #include "fallback-c89.c"
  43
  44 /**
  45  * SECTION:gtkthemingengine
  46  * @Short_description: Theming renderers
  47  * @Title: GtkThemingEngine
  48  * @See_also: #GtkStyleContext
  49  *
  50  * #GtkThemingEngine is the object used for rendering themed content
  51  * in GTK+ widgets. Even though GTK+ has a default implementation,
  52  * it can be overridden in CSS files by enforcing a #GtkThemingEngine
  53  * object to be loaded as a module.
  54  *
  55  * In order to implement a theming engine, a #GtkThemingEngine subclass
  56  * must be created, alongside the CSS file that will reference it, the
  57  * theming engine would be created as an .so library, and installed in
  58  * $(gtk-modules-dir)/theming-engines/.
  59  *
  60  * #GtkThemingEngine<!-- -->s have limited access to the object they are
  61  * rendering, the #GtkThemingEngine API has read-only accessors to the
  62  * style information contained in the rendered object's #GtkStyleContext.
  63  */
  64
  65 enum {
  66   PROP_0,
  67   PROP_NAME
  68 };
  69
  70 struct GtkThemingEnginePrivate
  71 {
  72   GtkStyleContext *context;
  73   gchar *name;
  74 };
  75
  76 #define GTK_THEMING_ENGINE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_THEMING_ENGINE, GtkThemingEnginePrivate))
  77
  78 static void gtk_theming_engine_finalize          (GObject      *object);
  79 static void gtk_theming_engine_impl_set_property (GObject      *object,
  80                                                   guint         prop_id,
  81                                                   const GValue *value,
  82                                                   GParamSpec   *pspec);
  83 static void gtk_theming_engine_impl_get_property (GObject      *object,
  84                                                   guint         prop_id,
  85                                                   GValue       *value,
  86                                                   GParamSpec   *pspec);
  87
  88 static void gtk_theming_engine_render_check (GtkThemingEngine *engine,
  89                                              cairo_t          *cr,
  90                                              gdouble           x,
  91                                              gdouble           y,
  92                                              gdouble           width,
  93                                              gdouble           height);
  94 static void gtk_theming_engine_render_option (GtkThemingEngine *engine,
  95                                               cairo_t          *cr,
  96                                               gdouble           x,
  97                                               gdouble           y,
  98                                               gdouble           width,
  99                                               gdouble           height);
 100 static void gtk_theming_engine_render_arrow  (GtkThemingEngine *engine,
 101                                               cairo_t          *cr,
 102                                               gdouble           angle,
 103                                               gdouble           x,
 104                                               gdouble           y,
 105                                               gdouble           size);
 106 static void gtk_theming_engine_render_background (GtkThemingEngine *engine,
 107                                                   cairo_t          *cr,
 108                                                   gdouble           x,
 109                                                   gdouble           y,
 110                                                   gdouble           width,
 111                                                   gdouble           height);
 112 static void gtk_theming_engine_render_frame  (GtkThemingEngine *engine,
 113                                               cairo_t          *cr,
 114                                               gdouble           x,
 115                                               gdouble           y,
 116                                               gdouble           width,
 117                                               gdouble           height);
 118 static void gtk_theming_engine_render_expander (GtkThemingEngine *engine,
 119                                                 cairo_t          *cr,
 120                                                 gdouble           x,
 121                                                 gdouble           y,
 122                                                 gdouble           width,
 123                                                 gdouble           height);
 124 static void gtk_theming_engine_render_focus    (GtkThemingEngine *engine,
 125                                                 cairo_t          *cr,
 126                                                 gdouble           x,
 127                                                 gdouble           y,
 128                                                 gdouble           width,
 129                                                 gdouble           height);
 130 static void gtk_theming_engine_render_layout   (GtkThemingEngine *engine,
 131                                                 cairo_t          *cr,
 132                                                 gdouble           x,
 133                                                 gdouble           y,
 134                                                 PangoLayout      *layout);
 135 static void gtk_theming_engine_render_line     (GtkThemingEngine *engine,
 136                                                 cairo_t          *cr,
 137                                                 gdouble           x0,
 138                                                 gdouble           y0,
 139                                                 gdouble           x1,
 140                                                 gdouble           y1);
 141 static void gtk_theming_engine_render_slider   (GtkThemingEngine *engine,
 142                                                 cairo_t          *cr,
 143                                                 gdouble           x,
 144                                                 gdouble           y,
 145                                                 gdouble           width,
 146                                                 gdouble           height,
 147                                                 GtkOrientation    orientation);
 148 static void gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
 149                                                  cairo_t          *cr,
 150                                                  gdouble           x,
 151                                                  gdouble           y,
 152                                                  gdouble           width,
 153                                                  gdouble           height,
 154                                                  GtkPositionType   gap_side,
 155                                                  gdouble           xy0_gap,
 156                                                  gdouble           xy1_gap);
 157 static void gtk_theming_engine_render_extension (GtkThemingEngine *engine,
 158                                                  cairo_t          *cr,
 159                                                  gdouble           x,
 160                                                  gdouble           y,
 161                                                  gdouble           width,
 162                                                  gdouble           height,
 163                                                  GtkPositionType   gap_side);
 164 static void gtk_theming_engine_render_handle    (GtkThemingEngine *engine,
 165                                                  cairo_t          *cr,
 166                                                  gdouble           x,
 167                                                  gdouble           y,
 168                                                  gdouble           width,
 169                                                  gdouble           height);
 170 static void gtk_theming_engine_render_activity  (GtkThemingEngine *engine,
 171                                                  cairo_t          *cr,
 172                                                  gdouble           x,
 173                                                  gdouble           y,
 174                                                  gdouble           width,
 175                                                  gdouble           height);
 176 static GdkPixbuf * gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
 177                                                           const GtkIconSource *source,
 178                                                           GtkIconSize          size);
 179 static void gtk_theming_engine_render_icon (GtkThemingEngine *engine,
 180                                             cairo_t *cr,
 181                                             GdkPixbuf *pixbuf,
 182                                             gdouble x,
 183                                             gdouble y);
 184
 185 G_DEFINE_TYPE (GtkThemingEngine, gtk_theming_engine, G_TYPE_OBJECT)
 186
 187
 188 typedef struct GtkThemingModule GtkThemingModule;
 189 typedef struct GtkThemingModuleClass GtkThemingModuleClass;
 190
 191 struct GtkThemingModule
 192 {
 193   GTypeModule parent_instance;
 194   GModule *module;
 195   gchar *name;
 196
 197   void (*init) (GTypeModule *module);
 198   void (*exit) (void);
 199   GtkThemingEngine * (*create_engine) (void);
 200 };
 201
 202 struct GtkThemingModuleClass
 203 {
 204   GTypeModuleClass parent_class;
 205 };
 206
 207 #define GTK_TYPE_THEMING_MODULE  (gtk_theming_module_get_type ())
 208 #define GTK_THEMING_MODULE(o)    (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_THEMING_MODULE, GtkThemingModule))
 209 #define GTK_IS_THEMING_MODULE(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_THEMING_MODULE))
 210
 211 G_DEFINE_TYPE (GtkThemingModule, gtk_theming_module, G_TYPE_TYPE_MODULE);
 212
 213 static void
 214 gtk_theming_engine_class_init (GtkThemingEngineClass *klass)
 215 {
 216   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 217
 218   object_class->finalize = gtk_theming_engine_finalize;
 219   object_class->set_property = gtk_theming_engine_impl_set_property;
 220   object_class->get_property = gtk_theming_engine_impl_get_property;
 221
 222   klass->render_icon = gtk_theming_engine_render_icon;
 223   klass->render_check = gtk_theming_engine_render_check;
 224   klass->render_option = gtk_theming_engine_render_option;
 225   klass->render_arrow = gtk_theming_engine_render_arrow;
 226   klass->render_background = gtk_theming_engine_render_background;
 227   klass->render_frame = gtk_theming_engine_render_frame;
 228   klass->render_expander = gtk_theming_engine_render_expander;
 229   klass->render_focus = gtk_theming_engine_render_focus;
 230   klass->render_layout = gtk_theming_engine_render_layout;
 231   klass->render_line = gtk_theming_engine_render_line;
 232   klass->render_slider = gtk_theming_engine_render_slider;
 233   klass->render_frame_gap = gtk_theming_engine_render_frame_gap;
 234   klass->render_extension = gtk_theming_engine_render_extension;
 235   klass->render_handle = gtk_theming_engine_render_handle;
 236   klass->render_activity = gtk_theming_engine_render_activity;
 237   klass->render_icon_pixbuf = gtk_theming_engine_render_icon_pixbuf;
 238
 239   /**
 240    * GtkThemingEngine:name:
 241    *
 242    * The theming engine name, this name will be used when registering
 243    * custom properties, for a theming engine named "Clearlooks" registering
 244    * a "glossy" custom property, it could be referenced in the CSS file as
 245    *
 246    * <programlisting>
 247    * -Clearlooks-glossy: true;
 248    * </programlisting>
 249    *
 250    * Since: 3.0
 251    */
 252   g_object_class_install_property (object_class,
 253                                    PROP_NAME,
 254                                    g_param_spec_string ("name",
 255                                                         P_("Name"),
 256                                                         P_("Theming engine name"),
 257                                                         NULL,
 258                                                         G_PARAM_CONSTRUCT_ONLY | GTK_PARAM_READWRITE));
 259
 260   g_type_class_add_private (object_class, sizeof (GtkThemingEnginePrivate));
 261 }
 262
 263 static void
 264 gtk_theming_engine_init (GtkThemingEngine *engine)
 265 {
 266   engine->priv = GTK_THEMING_ENGINE_GET_PRIVATE (engine);
 267 }
 268
 269 static void
 270 gtk_theming_engine_finalize (GObject *object)
 271 {
 272   GtkThemingEnginePrivate *priv;
 273
 274   priv = GTK_THEMING_ENGINE (object)->priv;
 275   g_free (priv->name);
 276
 277   G_OBJECT_GET_CLASS (gtk_theming_engine_parent_class)->finalize (object);
 278 }
 279
 280 static void
 281 gtk_theming_engine_impl_set_property (GObject      *object,
 282                                       guint         prop_id,
 283                                       const GValue *value,
 284                                       GParamSpec   *pspec)
 285 {
 286   GtkThemingEnginePrivate *priv;
 287
 288   priv = GTK_THEMING_ENGINE (object)->priv;
 289
 290   switch (prop_id)
 291     {
 292     case PROP_NAME:
 293       if (priv->name)
 294         g_free (priv->name);
 295
 296       priv->name = g_value_dup_string (value);
 297       break;
 298     default:
 299       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 300       break;
 301     }
 302 }
 303
 304 static void
 305 gtk_theming_engine_impl_get_property (GObject    *object,
 306                                       guint       prop_id,
 307                                       GValue     *value,
 308                                       GParamSpec *pspec)
 309 {
 310   GtkThemingEnginePrivate *priv;
 311
 312   priv = GTK_THEMING_ENGINE (object)->priv;
 313
 314   switch (prop_id)
 315     {
 316     case PROP_NAME:
 317       g_value_set_string (value, priv->name);
 318       break;
 319     default:
 320       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 321       break;
 322     }
 323 }
 324
 325 void
 326 _gtk_theming_engine_set_context (GtkThemingEngine *engine,
 327                                  GtkStyleContext  *context)
 328 {
 329   GtkThemingEnginePrivate *priv;
 330
 331   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 332   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
 333
 334   priv = engine->priv;
 335   priv->context = context;
 336 }
 337
 338 GtkStyleContext *
 339 _gtk_theming_engine_get_context (GtkThemingEngine *engine)
 340 {
 341   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 342
 343   return engine->priv->context;
 344 }
 345
 346 GtkCssValue *
 347 _gtk_theming_engine_peek_property (GtkThemingEngine *engine,
 348                                    guint             property_id)
 349 {
 350   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 351
 352   return _gtk_style_context_peek_property (engine->priv->context, property_id);
 353 }
 354
 355 double
 356 _gtk_theming_engine_get_number (GtkThemingEngine *engine,
 357                                 guint             property_id,
 358                                 double            one_hundred_percent)
 359 {
 360   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0.0);
 361
 362   return _gtk_style_context_get_number (engine->priv->context, property_id, one_hundred_percent);
 363 }
 364
 365 /**
 366  * gtk_theming_engine_get_property:
 367  * @engine: a #GtkThemingEngine
 368  * @property: the property name
 369  * @state: state to retrieve the value for
 370  * @value: (out) (transfer full): return location for the property value,
 371  *         you must free this memory using g_value_unset() once you are
 372  *         done with it.
 373  *
 374  * Gets a property value as retrieved from the style settings that apply
 375  * to the currently rendered element.
 376  *
 377  * Since: 3.0
 378  **/
 379 void
 380 gtk_theming_engine_get_property (GtkThemingEngine *engine,
 381                                  const gchar      *property,
 382                                  GtkStateFlags     state,
 383                                  GValue           *value)
 384 {
 385   GtkThemingEnginePrivate *priv;
 386
 387   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 388   g_return_if_fail (property != NULL);
 389   g_return_if_fail (value != NULL);
 390
 391   priv = engine->priv;
 392   gtk_style_context_get_property (priv->context, property, state, value);
 393 }
 394
 395 /**
 396  * gtk_theming_engine_get_valist:
 397  * @engine: a #GtkThemingEngine
 398  * @state: state to retrieve values for
 399  * @args: va_list of property name/return location pairs, followed by %NULL
 400  *
 401  * Retrieves several style property values that apply to the currently
 402  * rendered element.
 403  *
 404  * Since: 3.0
 405  **/
 406 void
 407 gtk_theming_engine_get_valist (GtkThemingEngine *engine,
 408                                GtkStateFlags     state,
 409                                va_list           args)
 410 {
 411   GtkThemingEnginePrivate *priv;
 412
 413   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 414
 415   priv = engine->priv;
 416   gtk_style_context_get_valist (priv->context, state, args);
 417 }
 418
 419 /**
 420  * gtk_theming_engine_get:
 421  * @engine: a #GtkThemingEngine
 422  * @state: state to retrieve values for
 423  * @...: property name /return value pairs, followed by %NULL
 424  *
 425  * Retrieves several style property values that apply to the currently
 426  * rendered element.
 427  *
 428  * Since: 3.0
 429  **/
 430 void
 431 gtk_theming_engine_get (GtkThemingEngine *engine,
 432                         GtkStateFlags     state,
 433                         ...)
 434 {
 435   GtkThemingEnginePrivate *priv;
 436   va_list args;
 437
 438   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 439
 440   priv = engine->priv;
 441
 442   va_start (args, state);
 443   gtk_style_context_get_valist (priv->context, state, args);
 444   va_end (args);
 445 }
 446
 447 /**
 448  * gtk_theming_engine_get_style_property:
 449  * @engine: a #GtkThemingEngine
 450  * @property_name: the name of the widget style property
 451  * @value: Return location for the property value, free with
 452  *         g_value_unset() after use.
 453  *
 454  * Gets the value for a widget style property.
 455  *
 456  * Since: 3.0
 457  **/
 458 void
 459 gtk_theming_engine_get_style_property (GtkThemingEngine *engine,
 460                                        const gchar      *property_name,
 461                                        GValue           *value)
 462 {
 463   GtkThemingEnginePrivate *priv;
 464
 465   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 466   g_return_if_fail (property_name != NULL);
 467
 468   priv = engine->priv;
 469   gtk_style_context_get_style_property (priv->context, property_name, value);
 470 }
 471
 472 /**
 473  * gtk_theming_engine_get_style_valist:
 474  * @engine: a #GtkThemingEngine
 475  * @args: va_list of property name/return location pairs, followed by %NULL
 476  *
 477  * Retrieves several widget style properties from @engine according to the
 478  * currently rendered content's style.
 479  *
 480  * Since: 3.0
 481  **/
 482 void
 483 gtk_theming_engine_get_style_valist (GtkThemingEngine *engine,
 484                                      va_list           args)
 485 {
 486   GtkThemingEnginePrivate *priv;
 487
 488   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 489
 490   priv = engine->priv;
 491   gtk_style_context_get_style_valist (priv->context, args);
 492 }
 493
 494 /**
 495  * gtk_theming_engine_get_style:
 496  * @engine: a #GtkThemingEngine
 497  * @...: property name /return value pairs, followed by %NULL
 498  *
 499  * Retrieves several widget style properties from @engine according
 500  * to the currently rendered content's style.
 501  *
 502  * Since: 3.0
 503  **/
 504 void
 505 gtk_theming_engine_get_style (GtkThemingEngine *engine,
 506                               ...)
 507 {
 508   GtkThemingEnginePrivate *priv;
 509   va_list args;
 510
 511   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 512
 513   priv = engine->priv;
 514
 515   va_start (args, engine);
 516   gtk_style_context_get_style_valist (priv->context, args);
 517   va_end (args);
 518 }
 519
 520 /**
 521  * gtk_theming_engine_lookup_color:
 522  * @engine: a #GtkThemingEngine
 523  * @color_name: color name to lookup
 524  * @color: (out): Return location for the looked up color
 525  *
 526  * Looks up and resolves a color name in the current style's color map.
 527  *
 528  * Returns: %TRUE if @color_name was found and resolved, %FALSE otherwise
 529  **/
 530 gboolean
 531 gtk_theming_engine_lookup_color (GtkThemingEngine *engine,
 532                                  const gchar      *color_name,
 533                                  GdkRGBA          *color)
 534 {
 535   GtkThemingEnginePrivate *priv;
 536
 537   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 538   g_return_val_if_fail (color_name != NULL, FALSE);
 539
 540   priv = engine->priv;
 541   return gtk_style_context_lookup_color (priv->context, color_name, color);
 542 }
 543
 544 /**
 545  * gtk_theming_engine_get_state:
 546  * @engine: a #GtkThemingEngine
 547  *
 548  * returns the state used when rendering.
 549  *
 550  * Returns: the state flags
 551  *
 552  * Since: 3.0
 553  **/
 554 GtkStateFlags
 555 gtk_theming_engine_get_state (GtkThemingEngine *engine)
 556 {
 557   GtkThemingEnginePrivate *priv;
 558
 559   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 560
 561   priv = engine->priv;
 562   return gtk_style_context_get_state (priv->context);
 563 }
 564
 565 /**
 566  * gtk_theming_engine_state_is_running:
 567  * @engine: a #GtkThemingEngine
 568  * @state: a widget state
 569  * @progress: (out): return location for the transition progress
 570  *
 571  * Returns %TRUE if there is a transition animation running for the
 572  * current region (see gtk_style_context_push_animatable_region()).
 573  *
 574  * If @progress is not %NULL, the animation progress will be returned
 575  * there, 0.0 means the state is closest to being %FALSE, while 1.0 means
 576  * it's closest to being %TRUE. This means transition animations will
 577  * run from 0 to 1 when @state is being set to %TRUE and from 1 to 0 when
 578  * it's being set to %FALSE.
 579  *
 580  * Returns: %TRUE if there is a running transition animation for @state.
 581  *
 582  * Since: 3.0
 583  *
 584  * Deprecated: 3.6: Always returns %FALSE
 585  **/
 586 gboolean
 587 gtk_theming_engine_state_is_running (GtkThemingEngine *engine,
 588                                      GtkStateType      state,
 589                                      gdouble          *progress)
 590 {
 591   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 592
 593   return FALSE;
 594 }
 595
 596 /**
 597  * gtk_theming_engine_get_path:
 598  * @engine: a #GtkThemingEngine
 599  *
 600  * Returns the widget path used for style matching.
 601  *
 602  * Returns: (transfer none): A #GtkWidgetPath
 603  *
 604  * Since: 3.0
 605  **/
 606 const GtkWidgetPath *
 607 gtk_theming_engine_get_path (GtkThemingEngine *engine)
 608 {
 609   GtkThemingEnginePrivate *priv;
 610
 611   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 612
 613   priv = engine->priv;
 614   return gtk_style_context_get_path (priv->context);
 615 }
 616
 617 /**
 618  * gtk_theming_engine_has_class:
 619  * @engine: a #GtkThemingEngine
 620  * @style_class: class name to look up
 621  *
 622  * Returns %TRUE if the currently rendered contents have
 623  * defined the given class name.
 624  *
 625  * Returns: %TRUE if @engine has @class_name defined
 626  *
 627  * Since: 3.0
 628  **/
 629 gboolean
 630 gtk_theming_engine_has_class (GtkThemingEngine *engine,
 631                               const gchar      *style_class)
 632 {
 633   GtkThemingEnginePrivate *priv;
 634
 635   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 636
 637   priv = engine->priv;
 638   return gtk_style_context_has_class (priv->context, style_class);
 639 }
 640
 641 /**
 642  * gtk_theming_engine_has_region:
 643  * @engine: a #GtkThemingEngine
 644  * @style_region: a region name
 645  * @flags: (out) (allow-none): return location for region flags
 646  *
 647  * Returns %TRUE if the currently rendered contents have the
 648  * region defined. If @flags_return is not %NULL, it is set
 649  * to the flags affecting the region.
 650  *
 651  * Returns: %TRUE if region is defined
 652  *
 653  * Since: 3.0
 654  **/
 655 gboolean
 656 gtk_theming_engine_has_region (GtkThemingEngine *engine,
 657                                const gchar      *style_region,
 658                                GtkRegionFlags   *flags)
 659 {
 660   GtkThemingEnginePrivate *priv;
 661
 662   if (flags)
 663     *flags = 0;
 664
 665   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 666
 667   priv = engine->priv;
 668   return gtk_style_context_has_region (priv->context, style_region, flags);
 669 }
 670
 671 /**
 672  * gtk_theming_engine_get_direction:
 673  * @engine: a #GtkThemingEngine
 674  *
 675  * Returns the widget direction used for rendering.
 676  *
 677  * Returns: the widget direction
 678  *
 679  * Since: 3.0
 680  **/
 681 GtkTextDirection
 682 gtk_theming_engine_get_direction (GtkThemingEngine *engine)
 683 {
 684   GtkThemingEnginePrivate *priv;
 685
 686   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), GTK_TEXT_DIR_LTR);
 687
 688   priv = engine->priv;
 689   return gtk_style_context_get_direction (priv->context);
 690 }
 691
 692 /**
 693  * gtk_theming_engine_get_junction_sides:
 694  * @engine: a #GtkThemingEngine
 695  *
 696  * Returns the widget direction used for rendering.
 697  *
 698  * Returns: the widget direction
 699  *
 700  * Since: 3.0
 701  **/
 702 GtkJunctionSides
 703 gtk_theming_engine_get_junction_sides (GtkThemingEngine *engine)
 704 {
 705   GtkThemingEnginePrivate *priv;
 706
 707   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 708
 709   priv = engine->priv;
 710   return gtk_style_context_get_junction_sides (priv->context);
 711 }
 712
 713 /**
 714  * gtk_theming_engine_get_color:
 715  * @engine: a #GtkThemingEngine
 716  * @state: state to retrieve the color for
 717  * @color: (out): return value for the foreground color
 718  *
 719  * Gets the foreground color for a given state.
 720  *
 721  * Since: 3.0
 722  **/
 723 void
 724 gtk_theming_engine_get_color (GtkThemingEngine *engine,
 725                               GtkStateFlags     state,
 726                               GdkRGBA          *color)
 727 {
 728   GtkThemingEnginePrivate *priv;
 729
 730   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 731
 732   priv = engine->priv;
 733   gtk_style_context_get_color (priv->context, state, color);
 734 }
 735
 736 /**
 737  * gtk_theming_engine_get_background_color:
 738  * @engine: a #GtkThemingEngine
 739  * @state: state to retrieve the color for
 740  * @color: (out): return value for the background color
 741  *
 742  * Gets the background color for a given state.
 743  *
 744  * Since: 3.0
 745  **/
 746 void
 747 gtk_theming_engine_get_background_color (GtkThemingEngine *engine,
 748                                          GtkStateFlags     state,
 749                                          GdkRGBA          *color)
 750 {
 751   GtkThemingEnginePrivate *priv;
 752
 753   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 754
 755   priv = engine->priv;
 756   gtk_style_context_get_background_color (priv->context, state, color);
 757 }
 758
 759 /**
 760  * gtk_theming_engine_get_border_color:
 761  * @engine: a #GtkThemingEngine
 762  * @state: state to retrieve the color for
 763  * @color: (out): return value for the border color
 764  *
 765  * Gets the border color for a given state.
 766  *
 767  * Since: 3.0
 768  **/
 769 void
 770 gtk_theming_engine_get_border_color (GtkThemingEngine *engine,
 771                                      GtkStateFlags     state,
 772                                      GdkRGBA          *color)
 773 {
 774   GtkThemingEnginePrivate *priv;
 775
 776   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 777
 778   priv = engine->priv;
 779   gtk_style_context_get_border_color (priv->context, state, color);
 780 }
 781
 782 /**
 783  * gtk_theming_engine_get_border:
 784  * @engine: a #GtkThemingEngine
 785  * @state: state to retrieve the border for
 786  * @border: (out): return value for the border settings
 787  *
 788  * Gets the border for a given state as a #GtkBorder.
 789  *
 790  * Since: 3.0
 791  **/
 792 void
 793 gtk_theming_engine_get_border (GtkThemingEngine *engine,
 794                                GtkStateFlags     state,
 795                                GtkBorder        *border)
 796 {
 797   GtkThemingEnginePrivate *priv;
 798
 799   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 800
 801   priv = engine->priv;
 802   gtk_style_context_get_border (priv->context, state, border);
 803 }
 804
 805 /**
 806  * gtk_theming_engine_get_padding:
 807  * @engine: a #GtkThemingEngine
 808  * @state: state to retrieve the padding for
 809  * @padding: (out): return value for the padding settings
 810  *
 811  * Gets the padding for a given state as a #GtkBorder.
 812  *
 813  * Since: 3.0
 814  **/
 815 void
 816 gtk_theming_engine_get_padding (GtkThemingEngine *engine,
 817                                 GtkStateFlags     state,
 818                                 GtkBorder        *padding)
 819 {
 820   GtkThemingEnginePrivate *priv;
 821
 822   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 823
 824   priv = engine->priv;
 825   gtk_style_context_get_padding (priv->context, state, padding);
 826 }
 827
 828 /**
 829  * gtk_theming_engine_get_margin:
 830  * @engine: a #GtkThemingEngine
 831  * @state: state to retrieve the border for
 832  * @margin: (out): return value for the margin settings
 833  *
 834  * Gets the margin for a given state as a #GtkBorder.
 835  *
 836  * Since: 3.0
 837  **/
 838 void
 839 gtk_theming_engine_get_margin (GtkThemingEngine *engine,
 840                                GtkStateFlags     state,
 841                                GtkBorder        *margin)
 842 {
 843   GtkThemingEnginePrivate *priv;
 844
 845   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 846
 847   priv = engine->priv;
 848   gtk_style_context_get_margin (priv->context, state, margin);
 849 }
 850
 851 /**
 852  * gtk_theming_engine_get_font:
 853  * @engine: a #GtkThemingEngine
 854  * @state: state to retrieve the font for
 855  *
 856  * Returns the font description for a given state.
 857  *
 858  * Returns: (transfer none): the #PangoFontDescription for the given
 859  *          state. This object is owned by GTK+ and should not be
 860  *          freed.
 861  *
 862  * Since: 3.0
 863  **/
 864 const PangoFontDescription *
 865 gtk_theming_engine_get_font (GtkThemingEngine *engine,
 866                              GtkStateFlags     state)
 867 {
 868   GtkThemingEnginePrivate *priv;
 869
 870   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 871
 872   priv = engine->priv;
 873   return gtk_style_context_get_font (priv->context, state);
 874 }
 875
 876 /* GtkThemingModule */
 877
 878 static gboolean
 879 gtk_theming_module_load (GTypeModule *type_module)
 880 {
 881   GtkThemingModule *theming_module;
 882   GModule *module;
 883   gchar *name, *module_path;
 884
 885   theming_module = GTK_THEMING_MODULE (type_module);
 886   name = theming_module->name;
 887   module_path = _gtk_find_module (name, "theming-engines");
 888
 889   if (!module_path)
 890     return FALSE;
 891
 892   module = g_module_open (module_path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 893   g_free (module_path);
 894
 895   if (!module)
 896     return FALSE;
 897
 898   if (!g_module_symbol (module, "theme_init",
 899                         (gpointer *) &theming_module->init) ||
 900       !g_module_symbol (module, "theme_exit",
 901                         (gpointer *) &theming_module->exit) ||
 902       !g_module_symbol (module, "create_engine",
 903                         (gpointer *) &theming_module->create_engine))
 904     {
 905       g_module_close (module);
 906
 907       return FALSE;
 908     }
 909
 910   theming_module->module = module;
 911
 912   theming_module->init (G_TYPE_MODULE (theming_module));
 913
 914   return TRUE;
 915 }
 916
 917 static void
 918 gtk_theming_module_unload (GTypeModule *type_module)
 919 {
 920   GtkThemingModule *theming_module;
 921
 922   theming_module = GTK_THEMING_MODULE (type_module);
 923
 924   theming_module->exit ();
 925
 926   g_module_close (theming_module->module);
 927
 928   theming_module->module = NULL;
 929   theming_module->init = NULL;
 930   theming_module->exit = NULL;
 931   theming_module->create_engine = NULL;
 932 }
 933
 934 static void
 935 gtk_theming_module_class_init (GtkThemingModuleClass *klass)
 936 {
 937   GTypeModuleClass *module_class = G_TYPE_MODULE_CLASS (klass);
 938
 939   module_class->load = gtk_theming_module_load;
 940   module_class->unload = gtk_theming_module_unload;
 941 }
 942
 943 static void
 944 gtk_theming_module_init (GtkThemingModule *module)
 945 {
 946 }
 947
 948 /**
 949  * gtk_theming_engine_load:
 950  * @name: Theme engine name to load
 951  *
 952  * Loads and initializes a theming engine module from the
 953  * standard directories.
 954  *
 955  * Returns: (transfer none): A theming engine, or %NULL if
 956  * the engine @name doesn't exist.
 957  **/
 958 GtkThemingEngine *
 959 gtk_theming_engine_load (const gchar *name)
 960 {
 961   static GHashTable *engines = NULL;
 962   static GtkThemingEngine *default_engine;
 963   GtkThemingEngine *engine = NULL;
 964
 965   if (name)
 966     {
 967       if (!engines)
 968         engines = g_hash_table_new (g_str_hash, g_str_equal);
 969
 970       engine = g_hash_table_lookup (engines, name);
 971
 972       if (!engine)
 973         {
 974           GtkThemingModule *module;
 975
 976           module = g_object_new (GTK_TYPE_THEMING_MODULE, NULL);
 977           g_type_module_set_name (G_TYPE_MODULE (module), name);
 978           module->name = g_strdup (name);
 979
 980           if (module && g_type_module_use (G_TYPE_MODULE (module)))
 981             {
 982               engine = (module->create_engine) ();
 983
 984               if (engine)
 985                 g_hash_table_insert (engines, module->name, engine);
 986             }
 987         }
 988     }
 989   else
 990     {
 991       if (G_UNLIKELY (!default_engine))
 992         default_engine = g_object_new (GTK_TYPE_THEMING_ENGINE, NULL);
 993
 994       engine = default_engine;
 995     }
 996
 997   return engine;
 998 }
 999
1000 /**
1001  * gtk_theming_engine_get_screen:
1002  * @engine: a #GtkThemingEngine
1003  *
1004  * Returns the #GdkScreen to which @engine currently rendering to.
1005  *
1006  * Returns: (transfer none): a #GdkScreen, or %NULL.
1007  **/
1008 GdkScreen *
1009 gtk_theming_engine_get_screen (GtkThemingEngine *engine)
1010 {
1011   GtkThemingEnginePrivate *priv;
1012
1013   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
1014
1015   priv = engine->priv;
1016   return gtk_style_context_get_screen (priv->context);
1017 }
1018
1019 /* Paint method implementations */
1020 static void
1021 gtk_theming_engine_render_check (GtkThemingEngine *engine,
1022                                  cairo_t          *cr,
1023                                  gdouble           x,
1024                                  gdouble           y,
1025                                  gdouble           width,
1026                                  gdouble           height)
1027 {
1028   GdkRGBA fg_color, bg_color;
1029   GtkStateFlags flags;
1030   gint exterior_size, interior_size, thickness, pad;
1031   GtkBorderStyle border_style;
1032   GtkBorder border;
1033   gint border_width;
1034   GtkThemingBackground bg;
1035
1036   _gtk_theming_background_init (&bg, engine,
1037                                 x, y,
1038                                 width, height,
1039                                 gtk_theming_engine_get_junction_sides (engine));
1040
1041   if (_gtk_theming_background_has_background_image (&bg))
1042     {
1043       _gtk_theming_background_render (&bg, cr);
1044       return;
1045     }
1046
1047   flags = gtk_theming_engine_get_state (engine);
1048   cairo_save (cr);
1049
1050   gtk_theming_engine_get_color (engine, flags, &fg_color);
1051   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1052   gtk_theming_engine_get_border (engine, flags, &border);
1053   border_style = _gtk_css_border_style_value_get
1054     (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_TOP_STYLE));
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       if (flags & GTK_STATE_FLAG_ACTIVE)
1108         {
1109           cairo_translate (cr,
1110                            x + pad, y + pad);
1111
1112           cairo_scale (cr, interior_size / 7., interior_size / 7.);
1113
1114           cairo_rectangle (cr, 0, 0, 7, 7);
1115           cairo_clip (cr);
1116
1117           cairo_move_to  (cr, 7.0, 0.0);
1118           cairo_line_to  (cr, 7.5, 1.0);
1119           cairo_curve_to (cr, 5.3, 2.0,
1120                           4.3, 4.0,
1121                           3.5, 7.0);
1122           cairo_curve_to (cr, 3.0, 5.7,
1123                           1.3, 4.7,
1124                           0.0, 4.7);
1125           cairo_line_to  (cr, 0.2, 3.5);
1126           cairo_curve_to (cr, 1.1, 3.5,
1127                           2.3, 4.3,
1128                           3.0, 5.0);
1129           cairo_curve_to (cr, 1.0, 3.9,
1130                           2.4, 4.1,
1131                           3.2, 4.9);
1132           cairo_curve_to (cr, 3.5, 3.1,
1133                           5.2, 2.0,
1134                           7.0, 0.0);
1135
1136           cairo_fill (cr);
1137         }
1138     }
1139
1140   cairo_restore (cr);
1141 }
1142
1143 static void
1144 gtk_theming_engine_render_option (GtkThemingEngine *engine,
1145                                   cairo_t          *cr,
1146                                   gdouble           x,
1147                                   gdouble           y,
1148                                   gdouble           width,
1149                                   gdouble           height)
1150 {
1151   GtkStateFlags flags;
1152   GdkRGBA fg_color, bg_color;
1153   gint exterior_size, interior_size, pad, thickness, border_width;
1154   GtkBorderStyle border_style;
1155   GtkBorder border;
1156   GtkThemingBackground bg;
1157
1158   _gtk_theming_background_init (&bg, engine,
1159                                 x, y,
1160                                 width, height,
1161                                 gtk_theming_engine_get_junction_sides (engine));
1162
1163   if (_gtk_theming_background_has_background_image (&bg))
1164     {
1165       _gtk_theming_background_render (&bg, cr);
1166       return;
1167     }
1168
1169   flags = gtk_theming_engine_get_state (engine);
1170
1171   cairo_save (cr);
1172
1173   gtk_theming_engine_get_color (engine, flags, &fg_color);
1174   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1175   gtk_theming_engine_get_border (engine, flags, &border);
1176   border_style = _gtk_css_border_style_value_get
1177     (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_TOP_STYLE));
1178
1179   exterior_size = MIN (width, height);
1180   border_width = MIN (MIN (border.top, border.bottom),
1181                       MIN (border.left, border.right));
1182
1183   if (exterior_size % 2 == 0) /* Ensure odd */
1184     exterior_size -= 1;
1185
1186   x -= (1 + exterior_size - width) / 2;
1187   y -= (1 + exterior_size - height) / 2;
1188
1189   if (border_style == GTK_BORDER_STYLE_SOLID)
1190     {
1191       GdkRGBA border_color;
1192
1193       cairo_set_line_width (cr, border_width);
1194       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1195
1196       cairo_new_sub_path (cr);
1197       cairo_arc (cr,
1198                  x + exterior_size / 2.,
1199                  y + exterior_size / 2.,
1200                  (exterior_size - 1) / 2.,
1201                  0, 2 * G_PI);
1202
1203       gdk_cairo_set_source_rgba (cr, &bg_color);
1204       cairo_fill_preserve (cr);
1205
1206       gdk_cairo_set_source_rgba (cr, &border_color);
1207       cairo_stroke (cr);
1208     }
1209
1210   gdk_cairo_set_source_rgba (cr, &fg_color);
1211
1212   /* FIXME: thickness */
1213   thickness = 1;
1214
1215   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1216     {
1217       gint line_thickness;
1218
1219       pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1220       interior_size = MAX (1, exterior_size - 2 * pad);
1221
1222       if (interior_size < 7)
1223         {
1224           interior_size = 7;
1225           pad = MAX (0, (exterior_size - interior_size) / 2);
1226         }
1227
1228       line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1229
1230       cairo_rectangle (cr,
1231                        x + pad,
1232                        y + pad + (interior_size - line_thickness) / 2.,
1233                        interior_size,
1234                        line_thickness);
1235       cairo_fill (cr);
1236     }
1237   if (flags & GTK_STATE_FLAG_ACTIVE)
1238     {
1239       pad = thickness + MAX (1, 2 * (exterior_size - 2 * thickness) / 9);
1240       interior_size = MAX (1, exterior_size - 2 * pad);
1241
1242       if (interior_size < 5)
1243         {
1244           interior_size = 7;
1245           pad = MAX (0, (exterior_size - interior_size) / 2);
1246         }
1247
1248       cairo_new_sub_path (cr);
1249       cairo_arc (cr,
1250                  x + pad + interior_size / 2.,
1251                  y + pad + interior_size / 2.,
1252                  interior_size / 2.,
1253                  0, 2 * G_PI);
1254       cairo_fill (cr);
1255     }
1256
1257   cairo_restore (cr);
1258 }
1259
1260 static void
1261 add_path_arrow (cairo_t *cr,
1262                 gdouble  angle,
1263                 gdouble  x,
1264                 gdouble  y,
1265                 gdouble  size)
1266 {
1267   cairo_save (cr);
1268
1269   cairo_translate (cr, x + (size / 2), y + (size / 2));
1270   cairo_rotate (cr, angle);
1271
1272   cairo_move_to (cr, 0, - (size / 4));
1273   cairo_line_to (cr, - (size / 2), (size / 4));
1274   cairo_line_to (cr, (size / 2), (size / 4));
1275   cairo_close_path (cr);
1276
1277   cairo_restore (cr);
1278 }
1279
1280 static void
1281 gtk_theming_engine_render_arrow (GtkThemingEngine *engine,
1282                                  cairo_t          *cr,
1283                                  gdouble           angle,
1284                                  gdouble           x,
1285                                  gdouble           y,
1286                                  gdouble           size)
1287 {
1288   GtkStateFlags flags;
1289   GdkRGBA fg_color;
1290
1291   cairo_save (cr);
1292
1293   flags = gtk_theming_engine_get_state (engine);
1294   gtk_theming_engine_get_color (engine, flags, &fg_color);
1295
1296   if (flags & GTK_STATE_FLAG_INSENSITIVE)
1297     {
1298       add_path_arrow (cr, angle, x + 1, y + 1, size);
1299       cairo_set_source_rgb (cr, 1, 1, 1);
1300       cairo_fill (cr);
1301     }
1302
1303   add_path_arrow (cr, angle, x, y, size);
1304   gdk_cairo_set_source_rgba (cr, &fg_color);
1305   cairo_fill (cr);
1306
1307   cairo_restore (cr);
1308 }
1309
1310 static void
1311 add_path_line (cairo_t        *cr,
1312                gdouble         x1,
1313                gdouble         y1,
1314                gdouble         x2,
1315                gdouble         y2)
1316 {
1317   /* Adjust endpoints */
1318   if (y1 == y2)
1319     {
1320       y1 += 0.5;
1321       y2 += 0.5;
1322       x2 += 1;
1323     }
1324   else if (x1 == x2)
1325     {
1326       x1 += 0.5;
1327       x2 += 0.5;
1328       y2 += 1;
1329     }
1330
1331   cairo_move_to (cr, x1, y1);
1332   cairo_line_to (cr, x2, y2);
1333 }
1334
1335 static void
1336 color_shade (const GdkRGBA *color,
1337              gdouble        factor,
1338              GdkRGBA       *color_return)
1339 {
1340   GtkSymbolicColor *literal, *shade;
1341
1342   literal = gtk_symbolic_color_new_literal (color);
1343   shade = gtk_symbolic_color_new_shade (literal, factor);
1344   gtk_symbolic_color_unref (literal);
1345
1346   gtk_symbolic_color_resolve (shade, NULL, color_return);
1347   gtk_symbolic_color_unref (shade);
1348 }
1349
1350 static void
1351 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1352                                       cairo_t          *cr,
1353                                       gdouble           x,
1354                                       gdouble           y,
1355                                       gdouble           width,
1356                                       gdouble           height)
1357 {
1358   GtkThemingBackground bg;
1359
1360   _gtk_theming_background_init (&bg, engine,
1361                                 x, y,
1362                                 width, height,
1363                                 gtk_theming_engine_get_junction_sides (engine));
1364
1365   _gtk_theming_background_render (&bg, cr);
1366 }
1367
1368 static void
1369 gtk_theming_engine_hide_border_sides (GtkBorder *border,
1370                                       guint      hidden_side)
1371 {
1372   if (hidden_side & (1 << GTK_CSS_TOP))
1373     border->top = 0;
1374   if (hidden_side & (1 << GTK_CSS_RIGHT))
1375     border->right = 0;
1376   if (hidden_side & (1 << GTK_CSS_BOTTOM))
1377     border->bottom = 0;
1378   if (hidden_side & (1 << GTK_CSS_LEFT))
1379     border->left = 0;
1380 }
1381
1382 static void
1383 render_frame_fill (cairo_t       *cr,
1384                    GtkRoundedBox *border_box,
1385                    GtkBorder     *border,
1386                    GdkRGBA        colors[4],
1387                    guint          hidden_side)
1388 {
1389   GtkRoundedBox padding_box;
1390   guint i, j;
1391
1392   padding_box = *border_box;
1393   _gtk_rounded_box_shrink (&padding_box, border->top, border->right, border->bottom, border->left);
1394
1395   if (hidden_side == 0 &&
1396       gdk_rgba_equal (&colors[0], &colors[1]) &&
1397       gdk_rgba_equal (&colors[0], &colors[2]) &&
1398       gdk_rgba_equal (&colors[0], &colors[3]))
1399     {
1400       gdk_cairo_set_source_rgba (cr, &colors[0]);
1401
1402       _gtk_rounded_box_path (border_box, cr);
1403       _gtk_rounded_box_path (&padding_box, cr);
1404       cairo_fill (cr);
1405     }
1406   else
1407     {
1408       for (i = 0; i < 4; i++)
1409         {
1410           if (hidden_side & (1 << i))
1411             continue;
1412
1413           for (j = 0; j < 4; j++)
1414             {
1415               if (hidden_side & (1 << j))
1416                 continue;
1417
1418               if (i == j ||
1419                   (gdk_rgba_equal (&colors[i], &colors[j])))
1420                 {
1421                   /* We were already painted when i == j */
1422                   if (i > j)
1423                     break;
1424
1425                   if (j == 0)
1426                     _gtk_rounded_box_path_top (border_box, &padding_box, cr);
1427                   else if (j == 1)
1428                     _gtk_rounded_box_path_right (border_box, &padding_box, cr);
1429                   else if (j == 2)
1430                     _gtk_rounded_box_path_bottom (border_box, &padding_box, cr);
1431                   else if (j == 3)
1432                     _gtk_rounded_box_path_left (border_box, &padding_box, cr);
1433                 }
1434             }
1435           /* We were already painted when i == j */
1436           if (i > j)
1437             continue;
1438
1439           gdk_cairo_set_source_rgba (cr, &colors[i]);
1440
1441           cairo_fill (cr);
1442         }
1443     }
1444 }
1445
1446 static void
1447 set_stroke_style (cairo_t        *cr,
1448                   double          line_width,
1449                   GtkBorderStyle  style,
1450                   double          length)
1451 {
1452   double segments[2];
1453   double n;
1454
1455   cairo_set_line_width (cr, line_width);
1456
1457   if (style == GTK_BORDER_STYLE_DOTTED)
1458     {
1459       n = round (0.5 * length / line_width);
1460
1461       segments[0] = 0;
1462       segments[1] = n ? length / n : 2;
1463       cairo_set_dash (cr, segments, G_N_ELEMENTS (segments), 0);
1464
1465       cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
1466       cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
1467     }
1468   else
1469     {
1470       n = length / line_width;
1471       /* Optimize the common case of an integer-sized rectangle
1472        * Again, we care about focus rectangles.
1473        */
1474       if (n == nearbyint (n))
1475         {
1476           segments[0] = 1;
1477           segments[1] = 2;
1478         }
1479       else
1480         {
1481           n = round ((1. / 3) * n);
1482
1483           segments[0] = n ? (1. / 3) * length / n : 1;
1484           segments[1] = 2 * segments[1];
1485         }
1486       cairo_set_dash (cr, segments, G_N_ELEMENTS (segments), 0);
1487
1488       cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1489       cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
1490     }
1491 }
1492
1493 static int
1494 get_border_side (GtkBorder  *border,
1495                  GtkCssSide  side)
1496 {
1497   switch (side)
1498     {
1499     case GTK_CSS_TOP:
1500       return border->top;
1501     case GTK_CSS_RIGHT:
1502       return border->right;
1503     case GTK_CSS_BOTTOM:
1504       return border->bottom;
1505     case GTK_CSS_LEFT:
1506       return border->left;
1507     default:
1508       g_assert_not_reached ();
1509       return 0;
1510     }
1511 }
1512
1513 static void
1514 render_frame_stroke (cairo_t       *cr,
1515                      GtkRoundedBox *border_box,
1516                      GtkBorder     *border,
1517                      GdkRGBA        colors[4],
1518                      guint          hidden_side,
1519                      GtkBorderStyle stroke_style)
1520 {
1521   gboolean different_colors, different_borders;
1522   GtkRoundedBox stroke_box;
1523   guint i;
1524
1525   different_colors = !gdk_rgba_equal (&colors[0], &colors[1]) ||
1526                      !gdk_rgba_equal (&colors[0], &colors[2]) ||
1527                      !gdk_rgba_equal (&colors[0], &colors[3]);
1528   different_borders = border->top != border->right ||
1529                       border->top != border->bottom ||
1530                       border->top != border->left;
1531
1532   stroke_box = *border_box;
1533   _gtk_rounded_box_shrink (&stroke_box,
1534                            border->top / 2.0,
1535                            border->right / 2.0,
1536                            border->bottom / 2.0,
1537                            border->left / 2.0);
1538
1539   if (!different_colors && !different_borders && hidden_side == 0)
1540     {
1541       double length = 0;
1542
1543       /* FAST PATH:
1544        * Mostly expected to trigger for focus rectangles */
1545       for (i = 0; i < 4; i++)
1546         {
1547           length += _gtk_rounded_box_guess_length (&stroke_box, i);
1548           _gtk_rounded_box_path_side (&stroke_box, cr, i);
1549         }
1550
1551       gdk_cairo_set_source_rgba (cr, &colors[0]);
1552       set_stroke_style (cr, border->top, stroke_style, length);
1553       cairo_stroke (cr);
1554     }
1555   else
1556     {
1557       GtkRoundedBox padding_box;
1558
1559       padding_box = *border_box;
1560       _gtk_rounded_box_path (&padding_box, cr);
1561       _gtk_rounded_box_shrink (&padding_box,
1562                                border->top,
1563                                border->right,
1564                                border->bottom,
1565                                border->left);
1566
1567       for (i = 0; i < 4; i++)
1568         {
1569           if (hidden_side & (1 << i))
1570             continue;
1571
1572           cairo_save (cr);
1573
1574           if (i == 0)
1575             _gtk_rounded_box_path_top (border_box, &padding_box, cr);
1576           else if (i == 1)
1577             _gtk_rounded_box_path_right (border_box, &padding_box, cr);
1578           else if (i == 2)
1579             _gtk_rounded_box_path_bottom (border_box, &padding_box, cr);
1580           else if (i == 3)
1581             _gtk_rounded_box_path_left (border_box, &padding_box, cr);
1582           cairo_clip (cr);
1583
1584           _gtk_rounded_box_path_side (&stroke_box, cr, i);
1585
1586           gdk_cairo_set_source_rgba (cr, &colors[i]);
1587           set_stroke_style (cr,
1588                             get_border_side (border, i),
1589                             stroke_style,
1590                             _gtk_rounded_box_guess_length (&stroke_box, i));
1591           cairo_stroke (cr);
1592
1593           cairo_restore (cr);
1594         }
1595     }
1596 }
1597
1598 static void
1599 render_border (cairo_t       *cr,
1600                GtkRoundedBox *border_box,
1601                GtkBorder     *border,
1602                guint          hidden_side,
1603                GdkRGBA        colors[4],
1604                GtkBorderStyle border_style[4])
1605 {
1606   guint i, j;
1607
1608   cairo_save (cr);
1609
1610   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
1611
1612   for (i = 0; i < 4; i++)
1613     {
1614       if (hidden_side & (1 << i))
1615         continue;
1616
1617       switch (border_style[i])
1618         {
1619         case GTK_BORDER_STYLE_NONE:
1620         case GTK_BORDER_STYLE_HIDDEN:
1621         case GTK_BORDER_STYLE_SOLID:
1622           break;
1623         case GTK_BORDER_STYLE_INSET:
1624           if (i == 1 || i == 2)
1625             color_shade (&colors[i], 1.8, &colors[i]);
1626           break;
1627         case GTK_BORDER_STYLE_OUTSET:
1628           if (i == 0 || i == 3)
1629             color_shade (&colors[i], 1.8, &colors[i]);
1630           break;
1631         case GTK_BORDER_STYLE_DOTTED:
1632         case GTK_BORDER_STYLE_DASHED:
1633           {
1634             guint dont_draw = hidden_side;
1635
1636             for (j = 0; j < 4; j++)
1637               {
1638                 if (border_style[j] == border_style[i])
1639                   hidden_side |= (1 << j);
1640                 else
1641                   dont_draw |= (1 << j);
1642               }
1643
1644             render_frame_stroke (cr, border_box, border, colors, dont_draw, border_style[i]);
1645           }
1646           break;
1647         case GTK_BORDER_STYLE_DOUBLE:
1648           {
1649             GtkRoundedBox other_box;
1650             GtkBorder other_border;
1651             guint dont_draw = hidden_side;
1652
1653             for (j = 0; j < 4; j++)
1654               {
1655                 if (border_style[j] == GTK_BORDER_STYLE_DOUBLE)
1656                   hidden_side |= (1 << j);
1657                 else
1658                   dont_draw |= (1 << j);
1659               }
1660             other_border.top = (border->top + 2) / 3;
1661             other_border.right = (border->right + 2) / 3;
1662             other_border.bottom = (border->bottom + 2) / 3;
1663             other_border.left = (border->left + 2) / 3;
1664
1665             render_frame_fill (cr, border_box, &other_border, colors, dont_draw);
1666
1667             other_box = *border_box;
1668             _gtk_rounded_box_shrink (&other_box,
1669                                      border->top - other_border.top,
1670                                      border->right - other_border.right,
1671                                      border->bottom - other_border.bottom,
1672                                      border->left - other_border.left);
1673             render_frame_fill (cr, &other_box, &other_border, colors, dont_draw);
1674           }
1675         case GTK_BORDER_STYLE_GROOVE:
1676         case GTK_BORDER_STYLE_RIDGE:
1677           {
1678             GtkRoundedBox other_box;
1679             GdkRGBA other_colors[4];
1680             guint dont_draw = hidden_side;
1681             GtkBorder other_border;
1682
1683             for (j = 0; j < 4; j++)
1684               {
1685                 other_colors[j] = colors[j];
1686                 if ((j == 0 || j == 3) ^ (border_style[j] == GTK_BORDER_STYLE_RIDGE))
1687                   color_shade (&other_colors[j], 1.8, &other_colors[j]);
1688                 else
1689                   color_shade (&colors[j], 1.8, &colors[j]);
1690                 if (border_style[j] == GTK_BORDER_STYLE_GROOVE ||
1691                     border_style[j] == GTK_BORDER_STYLE_RIDGE)
1692                   hidden_side |= (1 << j);
1693                 else
1694                   dont_draw |= (1 << j);
1695               }
1696             other_border.top = border->top / 2;
1697             other_border.right = border->right / 2;
1698             other_border.bottom = border->bottom / 2;
1699             other_border.left = border->left / 2;
1700
1701             render_frame_fill (cr, border_box, &other_border, colors, dont_draw);
1702
1703             other_box = *border_box;
1704             _gtk_rounded_box_shrink (&other_box,
1705                                      other_border.top, other_border.right,
1706                                      other_border.bottom, other_border.left);
1707             other_border.top = border->top - other_border.top;
1708             other_border.right = border->right - other_border.right;
1709             other_border.bottom = border->bottom - other_border.bottom;
1710             other_border.left = border->left - other_border.left;
1711             render_frame_fill (cr, &other_box, &other_border, other_colors, dont_draw);
1712           }
1713           break;
1714         default:
1715           g_assert_not_reached ();
1716           break;
1717         }
1718     }
1719
1720   render_frame_fill (cr, border_box, border, colors, hidden_side);
1721
1722   cairo_restore (cr);
1723 }
1724
1725 static void
1726 render_frame_internal (GtkThemingEngine *engine,
1727                        cairo_t          *cr,
1728                        gdouble           x,
1729                        gdouble           y,
1730                        gdouble           width,
1731                        gdouble           height,
1732                        guint             hidden_side,
1733                        GtkJunctionSides  junction)
1734 {
1735   GtkBorderImage border_image;
1736   GtkStateFlags state;
1737   GtkBorderStyle border_style[4];
1738   GtkRoundedBox border_box;
1739   GtkBorder border;
1740   GdkRGBA colors[4];
1741
1742   state = gtk_theming_engine_get_state (engine);
1743
1744   gtk_theming_engine_get_border (engine, state, &border);
1745   gtk_theming_engine_hide_border_sides (&border, hidden_side);
1746
1747   if (_gtk_border_image_init (&border_image, engine))
1748     _gtk_border_image_render (&border_image, &border, cr, x, y, width, height);
1749   else
1750     {
1751       border_style[0] = _gtk_css_border_style_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_TOP_STYLE));
1752       border_style[1] = _gtk_css_border_style_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_RIGHT_STYLE));
1753       border_style[2] = _gtk_css_border_style_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_BOTTOM_STYLE));
1754       border_style[3] = _gtk_css_border_style_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_LEFT_STYLE));
1755
1756       colors[0] = *_gtk_css_rgba_value_get_rgba (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_TOP_COLOR));
1757       colors[1] = *_gtk_css_rgba_value_get_rgba (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_RIGHT_COLOR));
1758       colors[2] = *_gtk_css_rgba_value_get_rgba (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_BOTTOM_COLOR));
1759       colors[3] = *_gtk_css_rgba_value_get_rgba (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_LEFT_COLOR));
1760
1761       _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1762       _gtk_rounded_box_apply_border_radius_for_engine (&border_box, engine, junction);
1763
1764       render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1765     }
1766
1767   border_style[0] = _gtk_css_border_style_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_STYLE));
1768   if (border_style[0] != GTK_BORDER_STYLE_NONE)
1769     {
1770       int offset;
1771
1772       border_style[1] = border_style[2] = border_style[3] = border_style[0];
1773       border.top = round (_gtk_css_number_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_WIDTH), 100));
1774       border.left = border.right = border.bottom = border.top;
1775       colors[0] = *_gtk_css_rgba_value_get_rgba (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_COLOR));
1776       colors[3] = colors[2] = colors[1] = colors[0];
1777       offset = _gtk_css_number_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_OFFSET), 100);
1778
1779       /* reinit box here - outlines don't have a border radius */
1780       _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1781       _gtk_rounded_box_shrink (&border_box,
1782                                - border.top - offset,
1783                                - border.right - offset,
1784                                - border.left - offset,
1785                                - border.bottom - offset);
1786
1787       render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1788     }
1789 }
1790
1791 static void
1792 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1793                                  cairo_t          *cr,
1794                                  gdouble           x,
1795                                  gdouble           y,
1796                                  gdouble           width,
1797                                  gdouble           height)
1798 {
1799   GtkJunctionSides junction;
1800
1801   junction = gtk_theming_engine_get_junction_sides (engine);
1802
1803   render_frame_internal (engine, cr,
1804                          x, y, width, height,
1805                          0, junction);
1806 }
1807
1808 static void
1809 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1810                                     cairo_t          *cr,
1811                                     gdouble           x,
1812                                     gdouble           y,
1813                                     gdouble           width,
1814                                     gdouble           height)
1815 {
1816   GtkStateFlags flags;
1817   GdkRGBA outline_color, fg_color;
1818   double vertical_overshoot;
1819   int diameter;
1820   double radius;
1821   double interp;                /* interpolation factor for center position */
1822   double x_double_horz, y_double_horz;
1823   double x_double_vert, y_double_vert;
1824   double x_double, y_double;
1825   gdouble angle;
1826   gint line_width;
1827   gboolean is_rtl;
1828   gdouble progress;
1829
1830   cairo_save (cr);
1831   flags = gtk_theming_engine_get_state (engine);
1832
1833   gtk_theming_engine_get_color (engine, flags, &fg_color);
1834   gtk_theming_engine_get_border_color (engine, flags, &outline_color);
1835
1836   is_rtl = (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL);
1837   line_width = 1;
1838   progress = (flags & GTK_STATE_FLAG_ACTIVE) ? 1 : 0;
1839
1840   if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_HORIZONTAL))
1841     {
1842       if (is_rtl)
1843         angle = (G_PI) - ((G_PI / 2) * progress);
1844       else
1845         angle = (G_PI / 2) * progress;
1846     }
1847   else
1848     {
1849       if (is_rtl)
1850         angle = (G_PI / 2) + ((G_PI / 2) * progress);
1851       else
1852         angle = (G_PI / 2) - ((G_PI / 2) * progress);
1853     }
1854
1855   interp = progress;
1856
1857   /* Compute distance that the stroke extends beyonds the end
1858    * of the triangle we draw.
1859    */
1860   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
1861
1862   /* For odd line widths, we end the vertical line of the triangle
1863    * at a half pixel, so we round differently.
1864    */
1865   if (line_width % 2 == 1)
1866     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
1867   else
1868     vertical_overshoot = ceil (vertical_overshoot);
1869
1870   /* Adjust the size of the triangle we draw so that the entire stroke fits
1871    */
1872   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
1873
1874   /* If the line width is odd, we want the diameter to be even,
1875    * and vice versa, so force the sum to be odd. This relationship
1876    * makes the point of the triangle look right.
1877    */
1878   diameter -= (1 - (diameter + line_width) % 2);
1879
1880   radius = diameter / 2.;
1881
1882   /* Adjust the center so that the stroke is properly aligned with
1883    * the pixel grid. The center adjustment is different for the
1884    * horizontal and vertical orientations. For intermediate positions
1885    * we interpolate between the two.
1886    */
1887   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1888   y_double_vert = (y + height / 2) - 0.5;
1889
1890   x_double_horz = (x + width / 2) - 0.5;
1891   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1892
1893   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
1894   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
1895
1896   cairo_translate (cr, x_double, y_double);
1897   cairo_rotate (cr, angle);
1898
1899   cairo_move_to (cr, - radius / 2., - radius);
1900   cairo_line_to (cr,   radius / 2.,   0);
1901   cairo_line_to (cr, - radius / 2.,   radius);
1902   cairo_close_path (cr);
1903
1904   cairo_set_line_width (cr, line_width);
1905
1906   gdk_cairo_set_source_rgba (cr, &fg_color);
1907
1908   cairo_fill_preserve (cr);
1909
1910   gdk_cairo_set_source_rgba (cr, &outline_color);
1911   cairo_stroke (cr);
1912
1913   cairo_restore (cr);
1914 }
1915
1916 static void
1917 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
1918                                  cairo_t          *cr,
1919                                  gdouble           x,
1920                                  gdouble           y,
1921                                  gdouble           width,
1922                                  gdouble           height)
1923 {
1924   GtkStateFlags flags;
1925   GdkRGBA color;
1926   gint line_width;
1927   gint8 *dash_list;
1928
1929   cairo_save (cr);
1930   flags = gtk_theming_engine_get_state (engine);
1931
1932   gtk_theming_engine_get_color (engine, flags, &color);
1933
1934   gtk_theming_engine_get_style (engine,
1935                                 "focus-line-width", &line_width,
1936                                 "focus-line-pattern", (gchar *) &dash_list,
1937                                 NULL);
1938
1939   cairo_set_line_width (cr, (gdouble) line_width);
1940
1941   if (dash_list[0])
1942     {
1943       gint n_dashes = strlen ((const gchar *) dash_list);
1944       gdouble *dashes = g_new (gdouble, n_dashes);
1945       gdouble total_length = 0;
1946       gdouble dash_offset;
1947       gint i;
1948
1949       for (i = 0; i < n_dashes; i++)
1950         {
1951           dashes[i] = dash_list[i];
1952           total_length += dash_list[i];
1953         }
1954
1955       /* The dash offset here aligns the pattern to integer pixels
1956        * by starting the dash at the right side of the left border
1957        * Negative dash offsets in cairo don't work
1958        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
1959        */
1960       dash_offset = - line_width / 2.;
1961
1962       while (dash_offset < 0)
1963         dash_offset += total_length;
1964
1965       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
1966       g_free (dashes);
1967     }
1968
1969   cairo_rectangle (cr,
1970                    x + line_width / 2.,
1971                    y + line_width / 2.,
1972                    width - line_width,
1973                    height - line_width);
1974
1975   gdk_cairo_set_source_rgba (cr, &color);
1976   cairo_stroke (cr);
1977
1978   cairo_restore (cr);
1979
1980   g_free (dash_list);
1981 }
1982
1983 static void
1984 gtk_theming_engine_render_line (GtkThemingEngine *engine,
1985                                 cairo_t          *cr,
1986                                 gdouble           x0,
1987                                 gdouble           y0,
1988                                 gdouble           x1,
1989                                 gdouble           y1)
1990 {
1991   GdkRGBA color;
1992   GtkStateFlags flags;
1993
1994   flags = gtk_theming_engine_get_state (engine);
1995   cairo_save (cr);
1996
1997   gtk_theming_engine_get_color (engine, flags, &color);
1998
1999   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
2000   cairo_set_line_width (cr, 1);
2001
2002   cairo_move_to (cr, x0 + 0.5, y0 + 0.5);
2003   cairo_line_to (cr, x1 + 0.5, y1 + 0.5);
2004
2005   gdk_cairo_set_source_rgba (cr, &color);
2006   cairo_stroke (cr);
2007
2008   cairo_restore (cr);
2009 }
2010
2011 static void
2012 prepare_context_for_layout (cairo_t *cr,
2013                             gdouble x,
2014                             gdouble y,
2015                             PangoLayout *layout)
2016 {
2017   const PangoMatrix *matrix;
2018
2019   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2020
2021   cairo_move_to (cr, x, y);
2022
2023   if (matrix)
2024     {
2025       cairo_matrix_t cairo_matrix;
2026
2027       cairo_matrix_init (&cairo_matrix,
2028                          matrix->xx, matrix->yx,
2029                          matrix->xy, matrix->yy,
2030                          matrix->x0, matrix->y0);
2031
2032       cairo_transform (cr, &cairo_matrix);
2033     }
2034 }
2035
2036 static void
2037 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2038                                   cairo_t          *cr,
2039                                   gdouble           x,
2040                                   gdouble           y,
2041                                   PangoLayout      *layout)
2042 {
2043   GdkRGBA fg_color;
2044   GtkStateFlags flags;
2045
2046   cairo_save (cr);
2047   flags = gtk_theming_engine_get_state (engine);
2048   gtk_theming_engine_get_color (engine, flags, &fg_color);
2049
2050   prepare_context_for_layout (cr, x, y, layout);
2051
2052   _gtk_css_shadows_value_paint_layout (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_TEXT_SHADOW),
2053                                        cr, layout);
2054
2055   gdk_cairo_set_source_rgba (cr, &fg_color);
2056   pango_cairo_show_layout (cr, layout);
2057
2058   cairo_restore (cr);
2059 }
2060
2061 static void
2062 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2063                                   cairo_t          *cr,
2064                                   gdouble           x,
2065                                   gdouble           y,
2066                                   gdouble           width,
2067                                   gdouble           height,
2068                                   GtkOrientation    orientation)
2069 {
2070   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2071   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2072 }
2073
2074 static void
2075 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2076                                      cairo_t          *cr,
2077                                      gdouble           x,
2078                                      gdouble           y,
2079                                      gdouble           width,
2080                                      gdouble           height,
2081                                      GtkPositionType   gap_side,
2082                                      gdouble           xy0_gap,
2083                                      gdouble           xy1_gap)
2084 {
2085   GtkJunctionSides junction;
2086   GtkStateFlags state;
2087   gint border_width;
2088   GtkCssValue *corner[4];
2089   gdouble x0, y0, x1, y1, xc, yc, wc, hc;
2090   GtkBorder border;
2091
2092   xc = yc = wc = hc = 0;
2093   state = gtk_theming_engine_get_state (engine);
2094   junction = gtk_theming_engine_get_junction_sides (engine);
2095
2096   gtk_theming_engine_get_border (engine, state, &border);
2097   corner[GTK_CSS_TOP_LEFT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_TOP_LEFT_RADIUS);
2098   corner[GTK_CSS_TOP_RIGHT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_TOP_RIGHT_RADIUS);
2099   corner[GTK_CSS_BOTTOM_LEFT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_BOTTOM_LEFT_RADIUS);
2100   corner[GTK_CSS_BOTTOM_RIGHT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_BOTTOM_RIGHT_RADIUS);
2101
2102   border_width = MIN (MIN (border.top, border.bottom),
2103                       MIN (border.left, border.right));
2104
2105   cairo_save (cr);
2106
2107   switch (gap_side)
2108     {
2109     case GTK_POS_TOP:
2110       xc = x + xy0_gap + border_width;
2111       yc = y;
2112       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2113       hc = border_width;
2114
2115       if (xy0_gap < _gtk_css_corner_value_get_x (corner[GTK_CSS_TOP_LEFT], width))
2116         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2117
2118       if (xy1_gap > width - _gtk_css_corner_value_get_x (corner[GTK_CSS_TOP_RIGHT], width))
2119         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2120       break;
2121     case GTK_POS_BOTTOM:
2122       xc = x + xy0_gap + border_width;
2123       yc = y + height - border_width;
2124       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2125       hc = border_width;
2126
2127       if (xy0_gap < _gtk_css_corner_value_get_x (corner[GTK_CSS_BOTTOM_LEFT], width))
2128         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2129
2130       if (xy1_gap > width - _gtk_css_corner_value_get_x (corner[GTK_CSS_BOTTOM_RIGHT], width))
2131         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2132
2133       break;
2134     case GTK_POS_LEFT:
2135       xc = x;
2136       yc = y + xy0_gap + border_width;
2137       wc = border_width;
2138       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2139
2140       if (xy0_gap < _gtk_css_corner_value_get_y (corner[GTK_CSS_TOP_LEFT], height))
2141         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2142
2143       if (xy1_gap > height - _gtk_css_corner_value_get_y (corner[GTK_CSS_BOTTOM_LEFT], height))
2144         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2145
2146       break;
2147     case GTK_POS_RIGHT:
2148       xc = x + width - border_width;
2149       yc = y + xy0_gap + border_width;
2150       wc = border_width;
2151       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2152
2153       if (xy0_gap < _gtk_css_corner_value_get_y (corner[GTK_CSS_TOP_RIGHT], height))
2154         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2155
2156       if (xy1_gap > height - _gtk_css_corner_value_get_y (corner[GTK_CSS_BOTTOM_RIGHT], height))
2157         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2158
2159       break;
2160     }
2161
2162   cairo_clip_extents (cr, &x0, &y0, &x1, &y1);
2163   cairo_rectangle (cr, x0, y0, x1 - x0, yc - y0);
2164   cairo_rectangle (cr, x0, yc, xc - x0, hc);
2165   cairo_rectangle (cr, xc + wc, yc, x1 - (xc + wc), hc);
2166   cairo_rectangle (cr, x0, yc + hc, x1 - x0, y1 - (yc + hc));
2167   cairo_clip (cr);
2168
2169   render_frame_internal (engine, cr,
2170                          x, y, width, height,
2171                          0, junction);
2172
2173   cairo_restore (cr);
2174 }
2175
2176 static void
2177 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2178                                      cairo_t          *cr,
2179                                      gdouble           x,
2180                                      gdouble           y,
2181                                      gdouble           width,
2182                                      gdouble           height,
2183                                      GtkPositionType   gap_side)
2184 {
2185   GtkThemingBackground bg;
2186   GtkJunctionSides junction = 0;
2187   guint hidden_side = 0;
2188
2189   switch (gap_side)
2190     {
2191     case GTK_POS_LEFT:
2192       junction = GTK_JUNCTION_LEFT;
2193       hidden_side = (1 << GTK_CSS_LEFT);
2194       break;
2195     case GTK_POS_RIGHT:
2196       junction = GTK_JUNCTION_RIGHT;
2197       hidden_side = (1 << GTK_CSS_RIGHT);
2198       break;
2199     case GTK_POS_TOP:
2200       junction = GTK_JUNCTION_TOP;
2201       hidden_side = (1 << GTK_CSS_TOP);
2202       break;
2203     case GTK_POS_BOTTOM:
2204       junction = GTK_JUNCTION_BOTTOM;
2205       hidden_side = (1 << GTK_CSS_BOTTOM);
2206       break;
2207     }
2208
2209   _gtk_theming_background_init (&bg, engine,
2210                                 x, y,
2211                                 width, height,
2212                                 junction);
2213   _gtk_theming_background_render (&bg, cr);
2214
2215   render_frame_internal (engine, cr,
2216                          x, y, width, height,
2217                          hidden_side, junction);
2218 }
2219
2220 static void
2221 render_dot (cairo_t       *cr,
2222             const GdkRGBA *lighter,
2223             const GdkRGBA *darker,
2224             gdouble        x,
2225             gdouble        y,
2226             gdouble        size)
2227 {
2228   size = CLAMP ((gint) size, 2, 3);
2229
2230   if (size == 2)
2231     {
2232       gdk_cairo_set_source_rgba (cr, lighter);
2233       cairo_rectangle (cr, x, y, 1, 1);
2234       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2235       cairo_fill (cr);
2236     }
2237   else if (size == 3)
2238     {
2239       gdk_cairo_set_source_rgba (cr, lighter);
2240       cairo_rectangle (cr, x, y, 2, 1);
2241       cairo_rectangle (cr, x, y, 1, 2);
2242       cairo_fill (cr);
2243
2244       gdk_cairo_set_source_rgba (cr, darker);
2245       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2246       cairo_rectangle (cr, x + 2, y, 1, 2);
2247       cairo_fill (cr);
2248     }
2249 }
2250
2251 static void
2252 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2253                                   cairo_t          *cr,
2254                                   gdouble           x,
2255                                   gdouble           y,
2256                                   gdouble           width,
2257                                   gdouble           height)
2258 {
2259   GtkStateFlags flags;
2260   GdkRGBA bg_color, lighter, darker;
2261   GtkJunctionSides sides;
2262   GtkThemingBackground bg;
2263   gint xx, yy;
2264   gboolean has_image;
2265
2266   cairo_save (cr);
2267   flags = gtk_theming_engine_get_state (engine);
2268
2269   cairo_set_line_width (cr, 1.0);
2270   sides = gtk_theming_engine_get_junction_sides (engine);
2271   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2272
2273   color_shade (&bg_color, 0.7, &darker);
2274   color_shade (&bg_color, 1.3, &lighter);
2275
2276   _gtk_theming_background_init (&bg, engine, x, y, width, height, sides);
2277   has_image = _gtk_theming_background_has_background_image (&bg);
2278   _gtk_theming_background_render (&bg, cr);
2279
2280   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2281
2282   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_GRIP))
2283     {
2284       /* reduce confusing values to a meaningful state */
2285       if ((sides & (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)) == (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT))
2286         sides &= ~GTK_JUNCTION_CORNER_TOPLEFT;
2287
2288       if ((sides & (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT)) == (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT))
2289         sides &= ~GTK_JUNCTION_CORNER_TOPRIGHT;
2290
2291       if (sides == 0)
2292         sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2293
2294       /* align drawing area to the connected side */
2295       if (sides == GTK_JUNCTION_LEFT)
2296         {
2297           if (height < width)
2298             width = height;
2299         }
2300       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2301         {
2302           if (width < height)
2303             height = width;
2304           else if (height < width)
2305             width = height;
2306         }
2307       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2308         {
2309           /* make it square, aligning to bottom left */
2310           if (width < height)
2311             {
2312               y += (height - width);
2313               height = width;
2314             }
2315           else if (height < width)
2316             width = height;
2317         }
2318       else if (sides == GTK_JUNCTION_RIGHT)
2319         {
2320           /* aligning to right */
2321           if (height < width)
2322             {
2323               x += (width - height);
2324               width = height;
2325             }
2326         }
2327       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2328         {
2329           if (width < height)
2330             height = width;
2331           else if (height < width)
2332             {
2333               x += (width - height);
2334               width = height;
2335             }
2336         }
2337       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2338         {
2339           /* make it square, aligning to bottom right */
2340           if (width < height)
2341             {
2342               y += (height - width);
2343               height = width;
2344             }
2345           else if (height < width)
2346             {
2347               x += (width - height);
2348               width = height;
2349             }
2350         }
2351       else if (sides == GTK_JUNCTION_TOP)
2352         {
2353           if (width < height)
2354             height = width;
2355         }
2356       else if (sides == GTK_JUNCTION_BOTTOM)
2357         {
2358           /* align to bottom */
2359           if (width < height)
2360             {
2361               y += (height - width);
2362               height = width;
2363             }
2364         }
2365       else
2366         g_assert_not_reached ();
2367
2368       if (sides == GTK_JUNCTION_LEFT ||
2369           sides == GTK_JUNCTION_RIGHT)
2370         {
2371           gint xi;
2372
2373           xi = x;
2374
2375           while (xi < x + width)
2376             {
2377               gdk_cairo_set_source_rgba (cr, &lighter);
2378               add_path_line (cr, x, y, x, y + height);
2379               cairo_stroke (cr);
2380               xi++;
2381
2382               gdk_cairo_set_source_rgba (cr, &darker);
2383               add_path_line (cr, xi, y, xi, y + height);
2384               cairo_stroke (cr);
2385               xi += 2;
2386             }
2387         }
2388       else if (sides == GTK_JUNCTION_TOP ||
2389                sides == GTK_JUNCTION_BOTTOM)
2390         {
2391           gint yi;
2392
2393           yi = y;
2394
2395           while (yi < y + height)
2396             {
2397               gdk_cairo_set_source_rgba (cr, &lighter);
2398               add_path_line (cr, x, yi, x + width, yi);
2399               cairo_stroke (cr);
2400               yi++;
2401
2402               gdk_cairo_set_source_rgba (cr, &darker);
2403               add_path_line (cr, x, yi, x + width, yi);
2404               cairo_stroke (cr);
2405               yi += 2;
2406             }
2407         }
2408       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2409         {
2410           gint xi, yi;
2411
2412           xi = x + width;
2413           yi = y + height;
2414
2415           while (xi > x + 3)
2416             {
2417               gdk_cairo_set_source_rgba (cr, &darker);
2418               add_path_line (cr, xi, y, x, yi);
2419               cairo_stroke (cr);
2420
2421               --xi;
2422               --yi;
2423
2424               add_path_line (cr, xi, y, x, yi);
2425               cairo_stroke (cr);
2426
2427               --xi;
2428               --yi;
2429
2430               gdk_cairo_set_source_rgba (cr, &lighter);
2431               add_path_line (cr, xi, y, x, yi);
2432               cairo_stroke (cr);
2433
2434               xi -= 3;
2435               yi -= 3;
2436             }
2437         }
2438       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2439         {
2440           gint xi, yi;
2441
2442           xi = x;
2443           yi = y + height;
2444
2445           while (xi < (x + width - 3))
2446             {
2447               gdk_cairo_set_source_rgba (cr, &lighter);
2448               add_path_line (cr, xi, y, x + width, yi);
2449               cairo_stroke (cr);
2450
2451               ++xi;
2452               --yi;
2453
2454               gdk_cairo_set_source_rgba (cr, &darker);
2455               add_path_line (cr, xi, y, x + width, yi);
2456               cairo_stroke (cr);
2457
2458               ++xi;
2459               --yi;
2460
2461               add_path_line (cr, xi, y, x + width, yi);
2462               cairo_stroke (cr);
2463
2464               xi += 3;
2465               yi -= 3;
2466             }
2467         }
2468       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2469         {
2470           gint xi, yi;
2471
2472           xi = x + width;
2473           yi = y;
2474
2475           while (xi > x + 3)
2476             {
2477               gdk_cairo_set_source_rgba (cr, &darker);
2478               add_path_line (cr, x, yi, xi, y + height);
2479               cairo_stroke (cr);
2480
2481               --xi;
2482               ++yi;
2483
2484               add_path_line (cr, x, yi, xi, y + height);
2485               cairo_stroke (cr);
2486
2487               --xi;
2488               ++yi;
2489
2490               gdk_cairo_set_source_rgba (cr, &lighter);
2491               add_path_line (cr, x, yi, xi, y + height);
2492               cairo_stroke (cr);
2493
2494               xi -= 3;
2495               yi += 3;
2496             }
2497         }
2498       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2499         {
2500           gint xi, yi;
2501
2502           xi = x;
2503           yi = y;
2504
2505           while (xi < (x + width - 3))
2506             {
2507               gdk_cairo_set_source_rgba (cr, &lighter);
2508               add_path_line (cr, xi, y + height, x + width, yi);
2509               cairo_stroke (cr);
2510
2511               ++xi;
2512               ++yi;
2513
2514               gdk_cairo_set_source_rgba (cr, &darker);
2515               add_path_line (cr, xi, y + height, x + width, yi);
2516               cairo_stroke (cr);
2517
2518               ++xi;
2519               ++yi;
2520
2521               add_path_line (cr, xi, y + height, x + width, yi);
2522               cairo_stroke (cr);
2523
2524               xi += 3;
2525               yi += 3;
2526             }
2527         }
2528     }
2529   else if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_PANE_SEPARATOR))
2530     {
2531       if (!has_image)
2532         {
2533           if (width > height)
2534             for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2535               render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2536           else
2537             for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2538               render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2539         }
2540     }
2541   else
2542     {
2543       for (yy = y; yy < y + height; yy += 3)
2544         for (xx = x; xx < x + width; xx += 6)
2545           {
2546             render_dot (cr, &lighter, &darker, xx, yy, 2);
2547             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2548           }
2549     }
2550
2551   cairo_restore (cr);
2552 }
2553
2554 void
2555 _gtk_theming_engine_paint_spinner (cairo_t       *cr,
2556                                    gdouble        radius,
2557                                    gdouble        progress,
2558                                    const GdkRGBA *color)
2559 {
2560   guint num_steps, step;
2561   gdouble half;
2562   gint i;
2563
2564   num_steps = 12;
2565
2566   if (progress >= 0)
2567     step = (guint) (progress * num_steps);
2568   else
2569     step = 0;
2570
2571   cairo_save (cr);
2572
2573   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2574   cairo_set_line_width (cr, 2.0);
2575
2576   half = num_steps / 2;
2577
2578   for (i = 0; i < num_steps; i++)
2579     {
2580       gint inset = 0.7 * radius;
2581
2582       /* transparency is a function of time and intial value */
2583       gdouble t = 1.0 - (gdouble) ((i + step) % num_steps) / num_steps;
2584       gdouble xscale = - sin (i * G_PI / half);
2585       gdouble yscale = - cos (i * G_PI / half);
2586
2587       cairo_set_source_rgba (cr,
2588                              color->red,
2589                              color->green,
2590                              color->blue,
2591                              color->alpha * t);
2592
2593       cairo_move_to (cr,
2594                      (radius - inset) * xscale,
2595                      (radius - inset) * yscale);
2596       cairo_line_to (cr,
2597                      radius * xscale,
2598                      radius * yscale);
2599
2600       cairo_stroke (cr);
2601     }
2602
2603   cairo_restore (cr);
2604 }
2605
2606 static void
2607 render_spinner (GtkThemingEngine *engine,
2608                 cairo_t          *cr,
2609                 gdouble           x,
2610                 gdouble           y,
2611                 gdouble           width,
2612                 gdouble           height)
2613 {
2614   GtkStateFlags state;
2615   GdkRGBA color;
2616   gdouble radius;
2617
2618   state = gtk_theming_engine_get_state (engine);
2619   radius = MIN (width / 2, height / 2);
2620
2621   gtk_theming_engine_get_color (engine, state, &color);
2622
2623   cairo_save (cr);
2624   cairo_translate (cr, x + width / 2, y + height / 2);
2625
2626   _gtk_css_shadows_value_paint_spinner (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_ICON_SHADOW),
2627                                         cr,
2628                                         radius,
2629                                         -1);
2630
2631   _gtk_theming_engine_paint_spinner (cr,
2632                                      radius,
2633                                      -1,
2634                                      &color);
2635
2636   cairo_restore (cr);
2637 }
2638
2639 static void
2640 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2641                                     cairo_t          *cr,
2642                                     gdouble           x,
2643                                     gdouble           y,
2644                                     gdouble           width,
2645                                     gdouble           height)
2646 {
2647   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
2648     {
2649       render_spinner (engine, cr, x, y, width, height);
2650     }
2651   else
2652     {
2653       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2654       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2655     }
2656 }
2657
2658 static GdkPixbuf *
2659 scale_or_ref (GdkPixbuf *src,
2660               gint       width,
2661               gint       height)
2662 {
2663   if (width == gdk_pixbuf_get_width (src) &&
2664       height == gdk_pixbuf_get_height (src))
2665     return g_object_ref (src);
2666   else
2667     return gdk_pixbuf_scale_simple (src,
2668                                     width, height,
2669                                     GDK_INTERP_BILINEAR);
2670 }
2671
2672 static gboolean
2673 lookup_icon_size (GtkThemingEngine *engine,
2674                   GtkIconSize       size,
2675                   gint             *width,
2676                   gint             *height)
2677 {
2678   GdkScreen *screen;
2679   GtkSettings *settings;
2680
2681   screen = gtk_theming_engine_get_screen (engine);
2682   settings = gtk_settings_get_for_screen (screen);
2683
2684   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
2685 }
2686
2687 static void
2688 colorshift_source (cairo_t *cr,
2689                    gdouble shift)
2690 {
2691   cairo_pattern_t *source;
2692
2693   cairo_save (cr);
2694   cairo_paint (cr);
2695
2696   source = cairo_pattern_reference (cairo_get_source (cr));
2697
2698   cairo_set_source_rgb (cr, shift, shift, shift);
2699   cairo_set_operator (cr, CAIRO_OPERATOR_COLOR_DODGE);
2700
2701   cairo_mask (cr, source);
2702
2703   cairo_pattern_destroy (source);
2704   cairo_restore (cr);
2705 }
2706
2707 static GdkPixbuf *
2708 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
2709                                        const GtkIconSource *source,
2710                                        GtkIconSize          size)
2711 {
2712   GdkPixbuf *scaled;
2713   GdkPixbuf *stated;
2714   GdkPixbuf *base_pixbuf;
2715   GtkStateFlags state;
2716   gint width = 1;
2717   gint height = 1;
2718   cairo_t *cr;
2719   cairo_surface_t *surface;
2720
2721   base_pixbuf = gtk_icon_source_get_pixbuf (source);
2722   state = gtk_theming_engine_get_state (engine);
2723
2724   g_return_val_if_fail (base_pixbuf != NULL, NULL);
2725
2726   if (size != (GtkIconSize) -1 &&
2727       !lookup_icon_size (engine, size, &width, &height))
2728     {
2729       g_warning (G_STRLOC ": invalid icon size '%d'", size);
2730       return NULL;
2731     }
2732
2733   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
2734    * leave it alone.
2735    */
2736   if (size != (GtkIconSize) -1 &&
2737       gtk_icon_source_get_size_wildcarded (source))
2738     scaled = scale_or_ref (base_pixbuf, width, height);
2739   else
2740     scaled = g_object_ref (base_pixbuf);
2741
2742   /* If the state was wildcarded, then generate a state. */
2743   if (gtk_icon_source_get_state_wildcarded (source))
2744     {
2745       if (state & GTK_STATE_FLAG_INSENSITIVE)
2746         {
2747           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2748                                                 gdk_pixbuf_get_width (scaled),
2749                                                 gdk_pixbuf_get_height (scaled));
2750           cr = cairo_create (surface);
2751           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2752           cairo_paint_with_alpha (cr, 0.5);
2753
2754           cairo_destroy (cr);
2755
2756           g_object_unref (scaled);
2757           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2758                                                 cairo_image_surface_get_width (surface),
2759                                                 cairo_image_surface_get_height (surface));
2760           cairo_surface_destroy (surface);
2761         }
2762       else if (state & GTK_STATE_FLAG_PRELIGHT)
2763         {
2764           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2765                                                 gdk_pixbuf_get_width (scaled),
2766                                                 gdk_pixbuf_get_height (scaled));
2767
2768           cr = cairo_create (surface);
2769           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2770           colorshift_source (cr, 0.10);
2771
2772           cairo_destroy (cr);
2773
2774           g_object_unref (scaled);
2775           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2776                                                 cairo_image_surface_get_width (surface),
2777                                                 cairo_image_surface_get_height (surface));
2778           cairo_surface_destroy (surface);
2779         }
2780       else
2781         stated = scaled;
2782     }
2783   else
2784     stated = scaled;
2785
2786   return stated;
2787 }
2788
2789 static void
2790 gtk_theming_engine_render_icon (GtkThemingEngine *engine,
2791                                 cairo_t *cr,
2792                                 GdkPixbuf *pixbuf,
2793                                 gdouble x,
2794                                 gdouble y)
2795 {
2796   cairo_save (cr);
2797
2798   gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
2799
2800   _gtk_css_shadows_value_paint_icon (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_ICON_SHADOW), cr);
2801
2802   cairo_paint (cr);
2803
2804   cairo_restore (cr);
2805 }
2806