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
1054   gtk_theming_engine_get (engine, flags,
1055                           "border-style", &border_style,
1056                           NULL);
1057
1058   border_width = MIN (MIN (border.top, border.bottom),
1059                       MIN (border.left, border.right));
1060   exterior_size = MIN (width, height);
1061
1062   if (exterior_size % 2 == 0) /* Ensure odd */
1063     exterior_size -= 1;
1064
1065   /* FIXME: thickness */
1066   thickness = 1;
1067   pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1068   interior_size = MAX (1, exterior_size - 2 * pad);
1069
1070   if (interior_size < 7)
1071     {
1072       interior_size = 7;
1073       pad = MAX (0, (exterior_size - interior_size) / 2);
1074     }
1075
1076   x -= (1 + exterior_size - (gint) width) / 2;
1077   y -= (1 + exterior_size - (gint) height) / 2;
1078
1079   if (border_style == GTK_BORDER_STYLE_SOLID)
1080     {
1081       GdkRGBA border_color;
1082
1083       cairo_set_line_width (cr, border_width);
1084       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1085
1086       cairo_rectangle (cr, x + 0.5, y + 0.5, exterior_size - 1, exterior_size - 1);
1087       gdk_cairo_set_source_rgba (cr, &bg_color);
1088       cairo_fill_preserve (cr);
1089
1090       gdk_cairo_set_source_rgba (cr, &border_color);
1091       cairo_stroke (cr);
1092     }
1093
1094   gdk_cairo_set_source_rgba (cr, &fg_color);
1095
1096   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1097     {
1098       int line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1099
1100       cairo_rectangle (cr,
1101                        x + pad,
1102                        y + pad + (1 + interior_size - line_thickness) / 2,
1103                        interior_size,
1104                        line_thickness);
1105       cairo_fill (cr);
1106     }
1107   else
1108     {
1109       if (flags & GTK_STATE_FLAG_ACTIVE)
1110         {
1111           cairo_translate (cr,
1112                            x + pad, y + pad);
1113
1114           cairo_scale (cr, interior_size / 7., interior_size / 7.);
1115
1116           cairo_rectangle (cr, 0, 0, 7, 7);
1117           cairo_clip (cr);
1118
1119           cairo_move_to  (cr, 7.0, 0.0);
1120           cairo_line_to  (cr, 7.5, 1.0);
1121           cairo_curve_to (cr, 5.3, 2.0,
1122                           4.3, 4.0,
1123                           3.5, 7.0);
1124           cairo_curve_to (cr, 3.0, 5.7,
1125                           1.3, 4.7,
1126                           0.0, 4.7);
1127           cairo_line_to  (cr, 0.2, 3.5);
1128           cairo_curve_to (cr, 1.1, 3.5,
1129                           2.3, 4.3,
1130                           3.0, 5.0);
1131           cairo_curve_to (cr, 1.0, 3.9,
1132                           2.4, 4.1,
1133                           3.2, 4.9);
1134           cairo_curve_to (cr, 3.5, 3.1,
1135                           5.2, 2.0,
1136                           7.0, 0.0);
1137
1138           cairo_fill (cr);
1139         }
1140     }
1141
1142   cairo_restore (cr);
1143 }
1144
1145 static void
1146 gtk_theming_engine_render_option (GtkThemingEngine *engine,
1147                                   cairo_t          *cr,
1148                                   gdouble           x,
1149                                   gdouble           y,
1150                                   gdouble           width,
1151                                   gdouble           height)
1152 {
1153   GtkStateFlags flags;
1154   GdkRGBA fg_color, bg_color;
1155   gint exterior_size, interior_size, pad, thickness, border_width;
1156   GtkBorderStyle border_style;
1157   GtkBorder border;
1158   GtkThemingBackground bg;
1159
1160   _gtk_theming_background_init (&bg, engine,
1161                                 x, y,
1162                                 width, height,
1163                                 gtk_theming_engine_get_junction_sides (engine));
1164
1165   if (_gtk_theming_background_has_background_image (&bg))
1166     {
1167       _gtk_theming_background_render (&bg, cr);
1168       return;
1169     }
1170
1171   flags = gtk_theming_engine_get_state (engine);
1172
1173   cairo_save (cr);
1174
1175   gtk_theming_engine_get_color (engine, flags, &fg_color);
1176   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1177   gtk_theming_engine_get_border (engine, flags, &border);
1178
1179   gtk_theming_engine_get (engine, flags,
1180                           "border-style", &border_style,
1181                           NULL);
1182
1183   exterior_size = MIN (width, height);
1184   border_width = MIN (MIN (border.top, border.bottom),
1185                       MIN (border.left, border.right));
1186
1187   if (exterior_size % 2 == 0) /* Ensure odd */
1188     exterior_size -= 1;
1189
1190   x -= (1 + exterior_size - width) / 2;
1191   y -= (1 + exterior_size - height) / 2;
1192
1193   if (border_style == GTK_BORDER_STYLE_SOLID)
1194     {
1195       GdkRGBA border_color;
1196
1197       cairo_set_line_width (cr, border_width);
1198       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1199
1200       cairo_new_sub_path (cr);
1201       cairo_arc (cr,
1202                  x + exterior_size / 2.,
1203                  y + exterior_size / 2.,
1204                  (exterior_size - 1) / 2.,
1205                  0, 2 * G_PI);
1206
1207       gdk_cairo_set_source_rgba (cr, &bg_color);
1208       cairo_fill_preserve (cr);
1209
1210       gdk_cairo_set_source_rgba (cr, &border_color);
1211       cairo_stroke (cr);
1212     }
1213
1214   gdk_cairo_set_source_rgba (cr, &fg_color);
1215
1216   /* FIXME: thickness */
1217   thickness = 1;
1218
1219   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1220     {
1221       gint line_thickness;
1222
1223       pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1224       interior_size = MAX (1, exterior_size - 2 * pad);
1225
1226       if (interior_size < 7)
1227         {
1228           interior_size = 7;
1229           pad = MAX (0, (exterior_size - interior_size) / 2);
1230         }
1231
1232       line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1233
1234       cairo_rectangle (cr,
1235                        x + pad,
1236                        y + pad + (interior_size - line_thickness) / 2.,
1237                        interior_size,
1238                        line_thickness);
1239       cairo_fill (cr);
1240     }
1241   if (flags & GTK_STATE_FLAG_ACTIVE)
1242     {
1243       pad = thickness + MAX (1, 2 * (exterior_size - 2 * thickness) / 9);
1244       interior_size = MAX (1, exterior_size - 2 * pad);
1245
1246       if (interior_size < 5)
1247         {
1248           interior_size = 7;
1249           pad = MAX (0, (exterior_size - interior_size) / 2);
1250         }
1251
1252       cairo_new_sub_path (cr);
1253       cairo_arc (cr,
1254                  x + pad + interior_size / 2.,
1255                  y + pad + interior_size / 2.,
1256                  interior_size / 2.,
1257                  0, 2 * G_PI);
1258       cairo_fill (cr);
1259     }
1260
1261   cairo_restore (cr);
1262 }
1263
1264 static void
1265 add_path_arrow (cairo_t *cr,
1266                 gdouble  angle,
1267                 gdouble  x,
1268                 gdouble  y,
1269                 gdouble  size)
1270 {
1271   cairo_save (cr);
1272
1273   cairo_translate (cr, x + (size / 2), y + (size / 2));
1274   cairo_rotate (cr, angle);
1275
1276   cairo_move_to (cr, 0, - (size / 4));
1277   cairo_line_to (cr, - (size / 2), (size / 4));
1278   cairo_line_to (cr, (size / 2), (size / 4));
1279   cairo_close_path (cr);
1280
1281   cairo_restore (cr);
1282 }
1283
1284 static void
1285 gtk_theming_engine_render_arrow (GtkThemingEngine *engine,
1286                                  cairo_t          *cr,
1287                                  gdouble           angle,
1288                                  gdouble           x,
1289                                  gdouble           y,
1290                                  gdouble           size)
1291 {
1292   GtkStateFlags flags;
1293   GdkRGBA fg_color;
1294
1295   cairo_save (cr);
1296
1297   flags = gtk_theming_engine_get_state (engine);
1298   gtk_theming_engine_get_color (engine, flags, &fg_color);
1299
1300   if (flags & GTK_STATE_FLAG_INSENSITIVE)
1301     {
1302       add_path_arrow (cr, angle, x + 1, y + 1, size);
1303       cairo_set_source_rgb (cr, 1, 1, 1);
1304       cairo_fill (cr);
1305     }
1306
1307   add_path_arrow (cr, angle, x, y, size);
1308   gdk_cairo_set_source_rgba (cr, &fg_color);
1309   cairo_fill (cr);
1310
1311   cairo_restore (cr);
1312 }
1313
1314 static void
1315 add_path_line (cairo_t        *cr,
1316                gdouble         x1,
1317                gdouble         y1,
1318                gdouble         x2,
1319                gdouble         y2)
1320 {
1321   /* Adjust endpoints */
1322   if (y1 == y2)
1323     {
1324       y1 += 0.5;
1325       y2 += 0.5;
1326       x2 += 1;
1327     }
1328   else if (x1 == x2)
1329     {
1330       x1 += 0.5;
1331       x2 += 0.5;
1332       y2 += 1;
1333     }
1334
1335   cairo_move_to (cr, x1, y1);
1336   cairo_line_to (cr, x2, y2);
1337 }
1338
1339 static void
1340 color_shade (const GdkRGBA *color,
1341              gdouble        factor,
1342              GdkRGBA       *color_return)
1343 {
1344   GtkSymbolicColor *literal, *shade;
1345
1346   literal = gtk_symbolic_color_new_literal (color);
1347   shade = gtk_symbolic_color_new_shade (literal, factor);
1348   gtk_symbolic_color_unref (literal);
1349
1350   gtk_symbolic_color_resolve (shade, NULL, color_return);
1351   gtk_symbolic_color_unref (shade);
1352 }
1353
1354 static void
1355 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1356                                       cairo_t          *cr,
1357                                       gdouble           x,
1358                                       gdouble           y,
1359                                       gdouble           width,
1360                                       gdouble           height)
1361 {
1362   GtkThemingBackground bg;
1363
1364   _gtk_theming_background_init (&bg, engine,
1365                                 x, y,
1366                                 width, height,
1367                                 gtk_theming_engine_get_junction_sides (engine));
1368
1369   _gtk_theming_background_render (&bg, cr);
1370 }
1371
1372 static void
1373 gtk_theming_engine_hide_border_sides (GtkBorder *border,
1374                                       guint      hidden_side)
1375 {
1376   if (hidden_side & (1 << GTK_CSS_TOP))
1377     border->top = 0;
1378   if (hidden_side & (1 << GTK_CSS_RIGHT))
1379     border->right = 0;
1380   if (hidden_side & (1 << GTK_CSS_BOTTOM))
1381     border->bottom = 0;
1382   if (hidden_side & (1 << GTK_CSS_LEFT))
1383     border->left = 0;
1384 }
1385
1386 static void
1387 render_frame_fill (cairo_t       *cr,
1388                    GtkRoundedBox *border_box,
1389                    GtkBorder     *border,
1390                    GdkRGBA        colors[4],
1391                    guint          hidden_side)
1392 {
1393   GtkRoundedBox padding_box;
1394   guint i, j;
1395
1396   padding_box = *border_box;
1397   _gtk_rounded_box_shrink (&padding_box, border->top, border->right, border->bottom, border->left);
1398
1399   if (hidden_side == 0 &&
1400       gdk_rgba_equal (&colors[0], &colors[1]) &&
1401       gdk_rgba_equal (&colors[0], &colors[2]) &&
1402       gdk_rgba_equal (&colors[0], &colors[3]))
1403     {
1404       gdk_cairo_set_source_rgba (cr, &colors[0]);
1405
1406       _gtk_rounded_box_path (border_box, cr);
1407       _gtk_rounded_box_path (&padding_box, cr);
1408       cairo_fill (cr);
1409     }
1410   else
1411     {
1412       for (i = 0; i < 4; i++)
1413         {
1414           if (hidden_side & (1 << i))
1415             continue;
1416
1417           for (j = 0; j < 4; j++)
1418             {
1419               if (hidden_side & (1 << j))
1420                 continue;
1421
1422               if (i == j ||
1423                   (gdk_rgba_equal (&colors[i], &colors[j])))
1424                 {
1425                   /* We were already painted when i == j */
1426                   if (i > j)
1427                     break;
1428
1429                   if (j == 0)
1430                     _gtk_rounded_box_path_top (border_box, &padding_box, cr);
1431                   else if (j == 1)
1432                     _gtk_rounded_box_path_right (border_box, &padding_box, cr);
1433                   else if (j == 2)
1434                     _gtk_rounded_box_path_bottom (border_box, &padding_box, cr);
1435                   else if (j == 3)
1436                     _gtk_rounded_box_path_left (border_box, &padding_box, cr);
1437                 }
1438             }
1439           /* We were already painted when i == j */
1440           if (i > j)
1441             continue;
1442
1443           gdk_cairo_set_source_rgba (cr, &colors[i]);
1444
1445           cairo_fill (cr);
1446         }
1447     }
1448 }
1449
1450 static void
1451 set_stroke_style (cairo_t        *cr,
1452                   double          line_width,
1453                   GtkBorderStyle  style,
1454                   double          length)
1455 {
1456   double segments[2];
1457   double n;
1458
1459   cairo_set_line_width (cr, line_width);
1460
1461   if (style == GTK_BORDER_STYLE_DOTTED)
1462     {
1463       n = round (0.5 * length / line_width);
1464
1465       segments[0] = 0;
1466       segments[1] = n ? length / n : 2;
1467       cairo_set_dash (cr, segments, G_N_ELEMENTS (segments), 0);
1468
1469       cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
1470       cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
1471     }
1472   else
1473     {
1474       n = length / line_width;
1475       /* Optimize the common case of an integer-sized rectangle
1476        * Again, we care about focus rectangles.
1477        */
1478       if (n == nearbyint (n))
1479         {
1480           segments[0] = 1;
1481           segments[1] = 2;
1482         }
1483       else
1484         {
1485           n = round ((1. / 3) * n);
1486
1487           segments[0] = n ? (1. / 3) * length / n : 1;
1488           segments[1] = 2 * segments[1];
1489         }
1490       cairo_set_dash (cr, segments, G_N_ELEMENTS (segments), 0);
1491
1492       cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1493       cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
1494     }
1495 }
1496
1497 static int
1498 get_border_side (GtkBorder  *border,
1499                  GtkCssSide  side)
1500 {
1501   switch (side)
1502     {
1503     case GTK_CSS_TOP:
1504       return border->top;
1505     case GTK_CSS_RIGHT:
1506       return border->right;
1507     case GTK_CSS_BOTTOM:
1508       return border->bottom;
1509     case GTK_CSS_LEFT:
1510       return border->left;
1511     default:
1512       g_assert_not_reached ();
1513       return 0;
1514     }
1515 }
1516
1517 static void
1518 render_frame_stroke (cairo_t       *cr,
1519                      GtkRoundedBox *border_box,
1520                      GtkBorder     *border,
1521                      GdkRGBA        colors[4],
1522                      guint          hidden_side,
1523                      GtkBorderStyle stroke_style)
1524 {
1525   gboolean different_colors, different_borders;
1526   GtkRoundedBox stroke_box;
1527   guint i;
1528
1529   different_colors = !gdk_rgba_equal (&colors[0], &colors[1]) ||
1530                      !gdk_rgba_equal (&colors[0], &colors[2]) ||
1531                      !gdk_rgba_equal (&colors[0], &colors[3]);
1532   different_borders = border->top != border->right ||
1533                       border->top != border->bottom ||
1534                       border->top != border->left;
1535
1536   stroke_box = *border_box;
1537   _gtk_rounded_box_shrink (&stroke_box,
1538                            border->top / 2.0,
1539                            border->right / 2.0,
1540                            border->bottom / 2.0,
1541                            border->left / 2.0);
1542
1543   if (!different_colors && !different_borders && hidden_side == 0)
1544     {
1545       double length = 0;
1546
1547       /* FAST PATH:
1548        * Mostly expected to trigger for focus rectangles */
1549       for (i = 0; i < 4; i++)
1550         {
1551           length += _gtk_rounded_box_guess_length (&stroke_box, i);
1552           _gtk_rounded_box_path_side (&stroke_box, cr, i);
1553         }
1554
1555       gdk_cairo_set_source_rgba (cr, &colors[0]);
1556       set_stroke_style (cr, border->top, stroke_style, length);
1557       cairo_stroke (cr);
1558     }
1559   else
1560     {
1561       GtkRoundedBox padding_box;
1562
1563       padding_box = *border_box;
1564       _gtk_rounded_box_path (&padding_box, cr);
1565       _gtk_rounded_box_shrink (&padding_box,
1566                                border->top,
1567                                border->right,
1568                                border->bottom,
1569                                border->left);
1570
1571       for (i = 0; i < 4; i++)
1572         {
1573           if (hidden_side & (1 << i))
1574             continue;
1575
1576           cairo_save (cr);
1577
1578           if (i == 0)
1579             _gtk_rounded_box_path_top (border_box, &padding_box, cr);
1580           else if (i == 1)
1581             _gtk_rounded_box_path_right (border_box, &padding_box, cr);
1582           else if (i == 2)
1583             _gtk_rounded_box_path_bottom (border_box, &padding_box, cr);
1584           else if (i == 3)
1585             _gtk_rounded_box_path_left (border_box, &padding_box, cr);
1586           cairo_clip (cr);
1587
1588           _gtk_rounded_box_path_side (&stroke_box, cr, i);
1589
1590           gdk_cairo_set_source_rgba (cr, &colors[i]);
1591           set_stroke_style (cr,
1592                             get_border_side (border, i),
1593                             stroke_style,
1594                             _gtk_rounded_box_guess_length (&stroke_box, i));
1595           cairo_stroke (cr);
1596
1597           cairo_restore (cr);
1598         }
1599     }
1600 }
1601
1602 static void
1603 render_border (cairo_t       *cr,
1604                GtkRoundedBox *border_box,
1605                GtkBorder     *border,
1606                guint          hidden_side,
1607                GdkRGBA        colors[4],
1608                GtkBorderStyle border_style[4])
1609 {
1610   guint i, j;
1611
1612   cairo_save (cr);
1613
1614   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
1615
1616   for (i = 0; i < 4; i++)
1617     {
1618       if (hidden_side & (1 << i))
1619         continue;
1620
1621       switch (border_style[i])
1622         {
1623         case GTK_BORDER_STYLE_NONE:
1624         case GTK_BORDER_STYLE_HIDDEN:
1625         case GTK_BORDER_STYLE_SOLID:
1626           break;
1627         case GTK_BORDER_STYLE_INSET:
1628           if (i == 1 || i == 2)
1629             color_shade (&colors[i], 1.8, &colors[i]);
1630           break;
1631         case GTK_BORDER_STYLE_OUTSET:
1632           if (i == 0 || i == 3)
1633             color_shade (&colors[i], 1.8, &colors[i]);
1634           break;
1635         case GTK_BORDER_STYLE_DOTTED:
1636         case GTK_BORDER_STYLE_DASHED:
1637           {
1638             guint dont_draw = hidden_side;
1639
1640             for (j = 0; j < 4; j++)
1641               {
1642                 if (border_style[j] == border_style[i])
1643                   hidden_side |= (1 << j);
1644                 else
1645                   dont_draw |= (1 << j);
1646               }
1647
1648             render_frame_stroke (cr, border_box, border, colors, dont_draw, border_style[i]);
1649           }
1650           break;
1651         case GTK_BORDER_STYLE_DOUBLE:
1652           {
1653             GtkRoundedBox other_box;
1654             GtkBorder other_border;
1655             guint dont_draw = hidden_side;
1656
1657             for (j = 0; j < 4; j++)
1658               {
1659                 if (border_style[j] == GTK_BORDER_STYLE_DOUBLE)
1660                   hidden_side |= (1 << j);
1661                 else
1662                   dont_draw |= (1 << j);
1663               }
1664             other_border.top = (border->top + 2) / 3;
1665             other_border.right = (border->right + 2) / 3;
1666             other_border.bottom = (border->bottom + 2) / 3;
1667             other_border.left = (border->left + 2) / 3;
1668
1669             render_frame_fill (cr, border_box, &other_border, colors, dont_draw);
1670
1671             other_box = *border_box;
1672             _gtk_rounded_box_shrink (&other_box,
1673                                      border->top - other_border.top,
1674                                      border->right - other_border.right,
1675                                      border->bottom - other_border.bottom,
1676                                      border->left - other_border.left);
1677             render_frame_fill (cr, &other_box, &other_border, colors, dont_draw);
1678           }
1679         case GTK_BORDER_STYLE_GROOVE:
1680         case GTK_BORDER_STYLE_RIDGE:
1681           {
1682             GtkRoundedBox other_box;
1683             GdkRGBA other_colors[4];
1684             guint dont_draw = hidden_side;
1685             GtkBorder other_border;
1686
1687             for (j = 0; j < 4; j++)
1688               {
1689                 other_colors[j] = colors[j];
1690                 if ((j == 0 || j == 3) ^ (border_style[j] == GTK_BORDER_STYLE_RIDGE))
1691                   color_shade (&other_colors[j], 1.8, &other_colors[j]);
1692                 else
1693                   color_shade (&colors[j], 1.8, &colors[j]);
1694                 if (border_style[j] == GTK_BORDER_STYLE_GROOVE ||
1695                     border_style[j] == GTK_BORDER_STYLE_RIDGE)
1696                   hidden_side |= (1 << j);
1697                 else
1698                   dont_draw |= (1 << j);
1699               }
1700             other_border.top = border->top / 2;
1701             other_border.right = border->right / 2;
1702             other_border.bottom = border->bottom / 2;
1703             other_border.left = border->left / 2;
1704
1705             render_frame_fill (cr, border_box, &other_border, colors, dont_draw);
1706
1707             other_box = *border_box;
1708             _gtk_rounded_box_shrink (&other_box,
1709                                      other_border.top, other_border.right,
1710                                      other_border.bottom, other_border.left);
1711             other_border.top = border->top - other_border.top;
1712             other_border.right = border->right - other_border.right;
1713             other_border.bottom = border->bottom - other_border.bottom;
1714             other_border.left = border->left - other_border.left;
1715             render_frame_fill (cr, &other_box, &other_border, other_colors, dont_draw);
1716           }
1717           break;
1718         default:
1719           g_assert_not_reached ();
1720           break;
1721         }
1722     }
1723
1724   render_frame_fill (cr, border_box, border, colors, hidden_side);
1725
1726   cairo_restore (cr);
1727 }
1728
1729 static void
1730 render_frame_internal (GtkThemingEngine *engine,
1731                        cairo_t          *cr,
1732                        gdouble           x,
1733                        gdouble           y,
1734                        gdouble           width,
1735                        gdouble           height,
1736                        guint             hidden_side,
1737                        GtkJunctionSides  junction)
1738 {
1739   GtkBorderImage border_image;
1740   GtkStateFlags state;
1741   GtkBorderStyle border_style[4];
1742   GtkRoundedBox border_box;
1743   GtkBorder border;
1744   GdkRGBA *alloc_colors[4];
1745   GdkRGBA colors[4];
1746   guint i;
1747
1748   state = gtk_theming_engine_get_state (engine);
1749
1750   gtk_theming_engine_get_border (engine, state, &border);
1751   gtk_theming_engine_hide_border_sides (&border, hidden_side);
1752
1753   if (_gtk_border_image_init (&border_image, engine))
1754     _gtk_border_image_render (&border_image, &border, cr, x, y, width, height);
1755   else
1756     {
1757       gtk_theming_engine_get (engine, state,
1758                               "border-top-style", &border_style[0],
1759                               "border-right-style", &border_style[1],
1760                               "border-bottom-style", &border_style[2],
1761                               "border-left-style", &border_style[3],
1762                               "border-top-color", &alloc_colors[0],
1763                               "border-right-color", &alloc_colors[1],
1764                               "border-bottom-color", &alloc_colors[2],
1765                               "border-left-color", &alloc_colors[3],
1766                               NULL);
1767
1768       for (i = 0; i < 4; i++)
1769         {
1770           colors[i] = *alloc_colors[i];
1771           gdk_rgba_free (alloc_colors[i]);
1772         }
1773
1774       _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1775       _gtk_rounded_box_apply_border_radius_for_engine (&border_box, engine, junction);
1776
1777       render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1778     }
1779
1780   border_style[0] = _gtk_css_border_style_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_STYLE));
1781   if (border_style[0] != GTK_BORDER_STYLE_NONE)
1782     {
1783       int offset;
1784
1785       border_style[1] = border_style[2] = border_style[3] = border_style[0];
1786       border.top = round (_gtk_css_number_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_WIDTH), 100));
1787       border.left = border.right = border.bottom = border.top;
1788       colors[0] = *_gtk_css_rgba_value_get_rgba (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_COLOR));
1789       colors[3] = colors[2] = colors[1] = colors[0];
1790       offset = _gtk_css_number_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_OFFSET), 100);
1791
1792       /* reinit box here - outlines don't have a border radius */
1793       _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1794       _gtk_rounded_box_shrink (&border_box,
1795                                - border.top - offset,
1796                                - border.right - offset,
1797                                - border.left - offset,
1798                                - border.bottom - offset);
1799
1800       render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1801     }
1802 }
1803
1804 static void
1805 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1806                                  cairo_t          *cr,
1807                                  gdouble           x,
1808                                  gdouble           y,
1809                                  gdouble           width,
1810                                  gdouble           height)
1811 {
1812   GtkJunctionSides junction;
1813
1814   junction = gtk_theming_engine_get_junction_sides (engine);
1815
1816   render_frame_internal (engine, cr,
1817                          x, y, width, height,
1818                          0, junction);
1819 }
1820
1821 static void
1822 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1823                                     cairo_t          *cr,
1824                                     gdouble           x,
1825                                     gdouble           y,
1826                                     gdouble           width,
1827                                     gdouble           height)
1828 {
1829   GtkStateFlags flags;
1830   GdkRGBA outline_color, fg_color;
1831   double vertical_overshoot;
1832   int diameter;
1833   double radius;
1834   double interp;                /* interpolation factor for center position */
1835   double x_double_horz, y_double_horz;
1836   double x_double_vert, y_double_vert;
1837   double x_double, y_double;
1838   gdouble angle;
1839   gint line_width;
1840   gboolean is_rtl;
1841   gdouble progress;
1842
1843   cairo_save (cr);
1844   flags = gtk_theming_engine_get_state (engine);
1845
1846   gtk_theming_engine_get_color (engine, flags, &fg_color);
1847   gtk_theming_engine_get_border_color (engine, flags, &outline_color);
1848
1849   is_rtl = (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL);
1850   line_width = 1;
1851   progress = (flags & GTK_STATE_FLAG_ACTIVE) ? 1 : 0;
1852
1853   if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_HORIZONTAL))
1854     {
1855       if (is_rtl)
1856         angle = (G_PI) - ((G_PI / 2) * progress);
1857       else
1858         angle = (G_PI / 2) * progress;
1859     }
1860   else
1861     {
1862       if (is_rtl)
1863         angle = (G_PI / 2) + ((G_PI / 2) * progress);
1864       else
1865         angle = (G_PI / 2) - ((G_PI / 2) * progress);
1866     }
1867
1868   interp = progress;
1869
1870   /* Compute distance that the stroke extends beyonds the end
1871    * of the triangle we draw.
1872    */
1873   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
1874
1875   /* For odd line widths, we end the vertical line of the triangle
1876    * at a half pixel, so we round differently.
1877    */
1878   if (line_width % 2 == 1)
1879     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
1880   else
1881     vertical_overshoot = ceil (vertical_overshoot);
1882
1883   /* Adjust the size of the triangle we draw so that the entire stroke fits
1884    */
1885   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
1886
1887   /* If the line width is odd, we want the diameter to be even,
1888    * and vice versa, so force the sum to be odd. This relationship
1889    * makes the point of the triangle look right.
1890    */
1891   diameter -= (1 - (diameter + line_width) % 2);
1892
1893   radius = diameter / 2.;
1894
1895   /* Adjust the center so that the stroke is properly aligned with
1896    * the pixel grid. The center adjustment is different for the
1897    * horizontal and vertical orientations. For intermediate positions
1898    * we interpolate between the two.
1899    */
1900   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1901   y_double_vert = (y + height / 2) - 0.5;
1902
1903   x_double_horz = (x + width / 2) - 0.5;
1904   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1905
1906   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
1907   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
1908
1909   cairo_translate (cr, x_double, y_double);
1910   cairo_rotate (cr, angle);
1911
1912   cairo_move_to (cr, - radius / 2., - radius);
1913   cairo_line_to (cr,   radius / 2.,   0);
1914   cairo_line_to (cr, - radius / 2.,   radius);
1915   cairo_close_path (cr);
1916
1917   cairo_set_line_width (cr, line_width);
1918
1919   gdk_cairo_set_source_rgba (cr, &fg_color);
1920
1921   cairo_fill_preserve (cr);
1922
1923   gdk_cairo_set_source_rgba (cr, &outline_color);
1924   cairo_stroke (cr);
1925
1926   cairo_restore (cr);
1927 }
1928
1929 static void
1930 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
1931                                  cairo_t          *cr,
1932                                  gdouble           x,
1933                                  gdouble           y,
1934                                  gdouble           width,
1935                                  gdouble           height)
1936 {
1937   GtkStateFlags flags;
1938   GdkRGBA color;
1939   gint line_width;
1940   gint8 *dash_list;
1941
1942   cairo_save (cr);
1943   flags = gtk_theming_engine_get_state (engine);
1944
1945   gtk_theming_engine_get_color (engine, flags, &color);
1946
1947   gtk_theming_engine_get_style (engine,
1948                                 "focus-line-width", &line_width,
1949                                 "focus-line-pattern", (gchar *) &dash_list,
1950                                 NULL);
1951
1952   cairo_set_line_width (cr, (gdouble) line_width);
1953
1954   if (dash_list[0])
1955     {
1956       gint n_dashes = strlen ((const gchar *) dash_list);
1957       gdouble *dashes = g_new (gdouble, n_dashes);
1958       gdouble total_length = 0;
1959       gdouble dash_offset;
1960       gint i;
1961
1962       for (i = 0; i < n_dashes; i++)
1963         {
1964           dashes[i] = dash_list[i];
1965           total_length += dash_list[i];
1966         }
1967
1968       /* The dash offset here aligns the pattern to integer pixels
1969        * by starting the dash at the right side of the left border
1970        * Negative dash offsets in cairo don't work
1971        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
1972        */
1973       dash_offset = - line_width / 2.;
1974
1975       while (dash_offset < 0)
1976         dash_offset += total_length;
1977
1978       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
1979       g_free (dashes);
1980     }
1981
1982   cairo_rectangle (cr,
1983                    x + line_width / 2.,
1984                    y + line_width / 2.,
1985                    width - line_width,
1986                    height - line_width);
1987
1988   gdk_cairo_set_source_rgba (cr, &color);
1989   cairo_stroke (cr);
1990
1991   cairo_restore (cr);
1992
1993   g_free (dash_list);
1994 }
1995
1996 static void
1997 gtk_theming_engine_render_line (GtkThemingEngine *engine,
1998                                 cairo_t          *cr,
1999                                 gdouble           x0,
2000                                 gdouble           y0,
2001                                 gdouble           x1,
2002                                 gdouble           y1)
2003 {
2004   GdkRGBA color;
2005   GtkStateFlags flags;
2006
2007   flags = gtk_theming_engine_get_state (engine);
2008   cairo_save (cr);
2009
2010   gtk_theming_engine_get_color (engine, flags, &color);
2011
2012   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
2013   cairo_set_line_width (cr, 1);
2014
2015   cairo_move_to (cr, x0 + 0.5, y0 + 0.5);
2016   cairo_line_to (cr, x1 + 0.5, y1 + 0.5);
2017
2018   gdk_cairo_set_source_rgba (cr, &color);
2019   cairo_stroke (cr);
2020
2021   cairo_restore (cr);
2022 }
2023
2024 static void
2025 prepare_context_for_layout (cairo_t *cr,
2026                             gdouble x,
2027                             gdouble y,
2028                             PangoLayout *layout)
2029 {
2030   const PangoMatrix *matrix;
2031
2032   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2033
2034   cairo_move_to (cr, x, y);
2035
2036   if (matrix)
2037     {
2038       cairo_matrix_t cairo_matrix;
2039
2040       cairo_matrix_init (&cairo_matrix,
2041                          matrix->xx, matrix->yx,
2042                          matrix->xy, matrix->yy,
2043                          matrix->x0, matrix->y0);
2044
2045       cairo_transform (cr, &cairo_matrix);
2046     }
2047 }
2048
2049 static void
2050 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2051                                   cairo_t          *cr,
2052                                   gdouble           x,
2053                                   gdouble           y,
2054                                   PangoLayout      *layout)
2055 {
2056   GdkRGBA fg_color;
2057   GtkStateFlags flags;
2058
2059   cairo_save (cr);
2060   flags = gtk_theming_engine_get_state (engine);
2061   gtk_theming_engine_get_color (engine, flags, &fg_color);
2062
2063   prepare_context_for_layout (cr, x, y, layout);
2064
2065   _gtk_css_shadows_value_paint_layout (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_TEXT_SHADOW),
2066                                        cr, layout);
2067
2068   gdk_cairo_set_source_rgba (cr, &fg_color);
2069   pango_cairo_show_layout (cr, layout);
2070
2071   cairo_restore (cr);
2072 }
2073
2074 static void
2075 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2076                                   cairo_t          *cr,
2077                                   gdouble           x,
2078                                   gdouble           y,
2079                                   gdouble           width,
2080                                   gdouble           height,
2081                                   GtkOrientation    orientation)
2082 {
2083   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2084   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2085 }
2086
2087 static void
2088 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2089                                      cairo_t          *cr,
2090                                      gdouble           x,
2091                                      gdouble           y,
2092                                      gdouble           width,
2093                                      gdouble           height,
2094                                      GtkPositionType   gap_side,
2095                                      gdouble           xy0_gap,
2096                                      gdouble           xy1_gap)
2097 {
2098   GtkJunctionSides junction;
2099   GtkStateFlags state;
2100   gint border_width;
2101   GtkCssValue *corner[4];
2102   gdouble x0, y0, x1, y1, xc, yc, wc, hc;
2103   GtkBorder border;
2104
2105   xc = yc = wc = hc = 0;
2106   state = gtk_theming_engine_get_state (engine);
2107   junction = gtk_theming_engine_get_junction_sides (engine);
2108
2109   gtk_theming_engine_get_border (engine, state, &border);
2110   corner[GTK_CSS_TOP_LEFT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_TOP_LEFT_RADIUS);
2111   corner[GTK_CSS_TOP_RIGHT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_TOP_RIGHT_RADIUS);
2112   corner[GTK_CSS_BOTTOM_LEFT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_BOTTOM_LEFT_RADIUS);
2113   corner[GTK_CSS_BOTTOM_RIGHT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_BOTTOM_RIGHT_RADIUS);
2114
2115   border_width = MIN (MIN (border.top, border.bottom),
2116                       MIN (border.left, border.right));
2117
2118   cairo_save (cr);
2119
2120   switch (gap_side)
2121     {
2122     case GTK_POS_TOP:
2123       xc = x + xy0_gap + border_width;
2124       yc = y;
2125       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2126       hc = border_width;
2127
2128       if (xy0_gap < _gtk_css_corner_value_get_x (corner[GTK_CSS_TOP_LEFT], width))
2129         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2130
2131       if (xy1_gap > width - _gtk_css_corner_value_get_x (corner[GTK_CSS_TOP_RIGHT], width))
2132         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2133       break;
2134     case GTK_POS_BOTTOM:
2135       xc = x + xy0_gap + border_width;
2136       yc = y + height - border_width;
2137       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2138       hc = border_width;
2139
2140       if (xy0_gap < _gtk_css_corner_value_get_x (corner[GTK_CSS_BOTTOM_LEFT], width))
2141         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2142
2143       if (xy1_gap > width - _gtk_css_corner_value_get_x (corner[GTK_CSS_BOTTOM_RIGHT], width))
2144         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2145
2146       break;
2147     case GTK_POS_LEFT:
2148       xc = x;
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_LEFT], height))
2154         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2155
2156       if (xy1_gap > height - _gtk_css_corner_value_get_y (corner[GTK_CSS_BOTTOM_LEFT], height))
2157         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2158
2159       break;
2160     case GTK_POS_RIGHT:
2161       xc = x + width - border_width;
2162       yc = y + xy0_gap + border_width;
2163       wc = border_width;
2164       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2165
2166       if (xy0_gap < _gtk_css_corner_value_get_y (corner[GTK_CSS_TOP_RIGHT], height))
2167         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2168
2169       if (xy1_gap > height - _gtk_css_corner_value_get_y (corner[GTK_CSS_BOTTOM_RIGHT], height))
2170         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2171
2172       break;
2173     }
2174
2175   cairo_clip_extents (cr, &x0, &y0, &x1, &y1);
2176   cairo_rectangle (cr, x0, y0, x1 - x0, yc - y0);
2177   cairo_rectangle (cr, x0, yc, xc - x0, hc);
2178   cairo_rectangle (cr, xc + wc, yc, x1 - (xc + wc), hc);
2179   cairo_rectangle (cr, x0, yc + hc, x1 - x0, y1 - (yc + hc));
2180   cairo_clip (cr);
2181
2182   render_frame_internal (engine, cr,
2183                          x, y, width, height,
2184                          0, junction);
2185
2186   cairo_restore (cr);
2187 }
2188
2189 static void
2190 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2191                                      cairo_t          *cr,
2192                                      gdouble           x,
2193                                      gdouble           y,
2194                                      gdouble           width,
2195                                      gdouble           height,
2196                                      GtkPositionType   gap_side)
2197 {
2198   GtkThemingBackground bg;
2199   GtkJunctionSides junction = 0;
2200   guint hidden_side = 0;
2201
2202   switch (gap_side)
2203     {
2204     case GTK_POS_LEFT:
2205       junction = GTK_JUNCTION_LEFT;
2206       hidden_side = (1 << GTK_CSS_LEFT);
2207       break;
2208     case GTK_POS_RIGHT:
2209       junction = GTK_JUNCTION_RIGHT;
2210       hidden_side = (1 << GTK_CSS_RIGHT);
2211       break;
2212     case GTK_POS_TOP:
2213       junction = GTK_JUNCTION_TOP;
2214       hidden_side = (1 << GTK_CSS_TOP);
2215       break;
2216     case GTK_POS_BOTTOM:
2217       junction = GTK_JUNCTION_BOTTOM;
2218       hidden_side = (1 << GTK_CSS_BOTTOM);
2219       break;
2220     }
2221
2222   _gtk_theming_background_init (&bg, engine,
2223                                 x, y,
2224                                 width, height,
2225                                 junction);
2226   _gtk_theming_background_render (&bg, cr);
2227
2228   render_frame_internal (engine, cr,
2229                          x, y, width, height,
2230                          hidden_side, junction);
2231 }
2232
2233 static void
2234 render_dot (cairo_t       *cr,
2235             const GdkRGBA *lighter,
2236             const GdkRGBA *darker,
2237             gdouble        x,
2238             gdouble        y,
2239             gdouble        size)
2240 {
2241   size = CLAMP ((gint) size, 2, 3);
2242
2243   if (size == 2)
2244     {
2245       gdk_cairo_set_source_rgba (cr, lighter);
2246       cairo_rectangle (cr, x, y, 1, 1);
2247       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2248       cairo_fill (cr);
2249     }
2250   else if (size == 3)
2251     {
2252       gdk_cairo_set_source_rgba (cr, lighter);
2253       cairo_rectangle (cr, x, y, 2, 1);
2254       cairo_rectangle (cr, x, y, 1, 2);
2255       cairo_fill (cr);
2256
2257       gdk_cairo_set_source_rgba (cr, darker);
2258       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2259       cairo_rectangle (cr, x + 2, y, 1, 2);
2260       cairo_fill (cr);
2261     }
2262 }
2263
2264 static void
2265 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2266                                   cairo_t          *cr,
2267                                   gdouble           x,
2268                                   gdouble           y,
2269                                   gdouble           width,
2270                                   gdouble           height)
2271 {
2272   GtkStateFlags flags;
2273   GdkRGBA bg_color, lighter, darker;
2274   GtkJunctionSides sides;
2275   GtkThemingBackground bg;
2276   gint xx, yy;
2277   gboolean has_image;
2278
2279   cairo_save (cr);
2280   flags = gtk_theming_engine_get_state (engine);
2281
2282   cairo_set_line_width (cr, 1.0);
2283   sides = gtk_theming_engine_get_junction_sides (engine);
2284   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2285
2286   color_shade (&bg_color, 0.7, &darker);
2287   color_shade (&bg_color, 1.3, &lighter);
2288
2289   _gtk_theming_background_init (&bg, engine, x, y, width, height, sides);
2290   has_image = _gtk_theming_background_has_background_image (&bg);
2291   _gtk_theming_background_render (&bg, cr);
2292
2293   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2294
2295   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_GRIP))
2296     {
2297       /* reduce confusing values to a meaningful state */
2298       if ((sides & (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)) == (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT))
2299         sides &= ~GTK_JUNCTION_CORNER_TOPLEFT;
2300
2301       if ((sides & (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT)) == (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT))
2302         sides &= ~GTK_JUNCTION_CORNER_TOPRIGHT;
2303
2304       if (sides == 0)
2305         sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2306
2307       /* align drawing area to the connected side */
2308       if (sides == GTK_JUNCTION_LEFT)
2309         {
2310           if (height < width)
2311             width = height;
2312         }
2313       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2314         {
2315           if (width < height)
2316             height = width;
2317           else if (height < width)
2318             width = height;
2319         }
2320       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2321         {
2322           /* make it square, aligning to bottom left */
2323           if (width < height)
2324             {
2325               y += (height - width);
2326               height = width;
2327             }
2328           else if (height < width)
2329             width = height;
2330         }
2331       else if (sides == GTK_JUNCTION_RIGHT)
2332         {
2333           /* aligning to right */
2334           if (height < width)
2335             {
2336               x += (width - height);
2337               width = height;
2338             }
2339         }
2340       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2341         {
2342           if (width < height)
2343             height = width;
2344           else if (height < width)
2345             {
2346               x += (width - height);
2347               width = height;
2348             }
2349         }
2350       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2351         {
2352           /* make it square, aligning to bottom right */
2353           if (width < height)
2354             {
2355               y += (height - width);
2356               height = width;
2357             }
2358           else if (height < width)
2359             {
2360               x += (width - height);
2361               width = height;
2362             }
2363         }
2364       else if (sides == GTK_JUNCTION_TOP)
2365         {
2366           if (width < height)
2367             height = width;
2368         }
2369       else if (sides == GTK_JUNCTION_BOTTOM)
2370         {
2371           /* align to bottom */
2372           if (width < height)
2373             {
2374               y += (height - width);
2375               height = width;
2376             }
2377         }
2378       else
2379         g_assert_not_reached ();
2380
2381       if (sides == GTK_JUNCTION_LEFT ||
2382           sides == GTK_JUNCTION_RIGHT)
2383         {
2384           gint xi;
2385
2386           xi = x;
2387
2388           while (xi < x + width)
2389             {
2390               gdk_cairo_set_source_rgba (cr, &lighter);
2391               add_path_line (cr, x, y, x, y + height);
2392               cairo_stroke (cr);
2393               xi++;
2394
2395               gdk_cairo_set_source_rgba (cr, &darker);
2396               add_path_line (cr, xi, y, xi, y + height);
2397               cairo_stroke (cr);
2398               xi += 2;
2399             }
2400         }
2401       else if (sides == GTK_JUNCTION_TOP ||
2402                sides == GTK_JUNCTION_BOTTOM)
2403         {
2404           gint yi;
2405
2406           yi = y;
2407
2408           while (yi < y + height)
2409             {
2410               gdk_cairo_set_source_rgba (cr, &lighter);
2411               add_path_line (cr, x, yi, x + width, yi);
2412               cairo_stroke (cr);
2413               yi++;
2414
2415               gdk_cairo_set_source_rgba (cr, &darker);
2416               add_path_line (cr, x, yi, x + width, yi);
2417               cairo_stroke (cr);
2418               yi += 2;
2419             }
2420         }
2421       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2422         {
2423           gint xi, yi;
2424
2425           xi = x + width;
2426           yi = y + height;
2427
2428           while (xi > x + 3)
2429             {
2430               gdk_cairo_set_source_rgba (cr, &darker);
2431               add_path_line (cr, xi, y, x, yi);
2432               cairo_stroke (cr);
2433
2434               --xi;
2435               --yi;
2436
2437               add_path_line (cr, xi, y, x, yi);
2438               cairo_stroke (cr);
2439
2440               --xi;
2441               --yi;
2442
2443               gdk_cairo_set_source_rgba (cr, &lighter);
2444               add_path_line (cr, xi, y, x, yi);
2445               cairo_stroke (cr);
2446
2447               xi -= 3;
2448               yi -= 3;
2449             }
2450         }
2451       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2452         {
2453           gint xi, yi;
2454
2455           xi = x;
2456           yi = y + height;
2457
2458           while (xi < (x + width - 3))
2459             {
2460               gdk_cairo_set_source_rgba (cr, &lighter);
2461               add_path_line (cr, xi, y, x + width, yi);
2462               cairo_stroke (cr);
2463
2464               ++xi;
2465               --yi;
2466
2467               gdk_cairo_set_source_rgba (cr, &darker);
2468               add_path_line (cr, xi, y, x + width, yi);
2469               cairo_stroke (cr);
2470
2471               ++xi;
2472               --yi;
2473
2474               add_path_line (cr, xi, y, x + width, yi);
2475               cairo_stroke (cr);
2476
2477               xi += 3;
2478               yi -= 3;
2479             }
2480         }
2481       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2482         {
2483           gint xi, yi;
2484
2485           xi = x + width;
2486           yi = y;
2487
2488           while (xi > x + 3)
2489             {
2490               gdk_cairo_set_source_rgba (cr, &darker);
2491               add_path_line (cr, x, yi, xi, y + height);
2492               cairo_stroke (cr);
2493
2494               --xi;
2495               ++yi;
2496
2497               add_path_line (cr, x, yi, xi, y + height);
2498               cairo_stroke (cr);
2499
2500               --xi;
2501               ++yi;
2502
2503               gdk_cairo_set_source_rgba (cr, &lighter);
2504               add_path_line (cr, x, yi, xi, y + height);
2505               cairo_stroke (cr);
2506
2507               xi -= 3;
2508               yi += 3;
2509             }
2510         }
2511       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2512         {
2513           gint xi, yi;
2514
2515           xi = x;
2516           yi = y;
2517
2518           while (xi < (x + width - 3))
2519             {
2520               gdk_cairo_set_source_rgba (cr, &lighter);
2521               add_path_line (cr, xi, y + height, x + width, yi);
2522               cairo_stroke (cr);
2523
2524               ++xi;
2525               ++yi;
2526
2527               gdk_cairo_set_source_rgba (cr, &darker);
2528               add_path_line (cr, xi, y + height, x + width, yi);
2529               cairo_stroke (cr);
2530
2531               ++xi;
2532               ++yi;
2533
2534               add_path_line (cr, xi, y + height, x + width, yi);
2535               cairo_stroke (cr);
2536
2537               xi += 3;
2538               yi += 3;
2539             }
2540         }
2541     }
2542   else if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_PANE_SEPARATOR))
2543     {
2544       if (!has_image)
2545         {
2546           if (width > height)
2547             for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2548               render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2549           else
2550             for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2551               render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2552         }
2553     }
2554   else
2555     {
2556       for (yy = y; yy < y + height; yy += 3)
2557         for (xx = x; xx < x + width; xx += 6)
2558           {
2559             render_dot (cr, &lighter, &darker, xx, yy, 2);
2560             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2561           }
2562     }
2563
2564   cairo_restore (cr);
2565 }
2566
2567 void
2568 _gtk_theming_engine_paint_spinner (cairo_t       *cr,
2569                                    gdouble        radius,
2570                                    gdouble        progress,
2571                                    const GdkRGBA *color)
2572 {
2573   guint num_steps, step;
2574   gdouble half;
2575   gint i;
2576
2577   num_steps = 12;
2578
2579   if (progress >= 0)
2580     step = (guint) (progress * num_steps);
2581   else
2582     step = 0;
2583
2584   cairo_save (cr);
2585
2586   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2587   cairo_set_line_width (cr, 2.0);
2588
2589   half = num_steps / 2;
2590
2591   for (i = 0; i < num_steps; i++)
2592     {
2593       gint inset = 0.7 * radius;
2594
2595       /* transparency is a function of time and intial value */
2596       gdouble t = 1.0 - (gdouble) ((i + step) % num_steps) / num_steps;
2597       gdouble xscale = - sin (i * G_PI / half);
2598       gdouble yscale = - cos (i * G_PI / half);
2599
2600       cairo_set_source_rgba (cr,
2601                              color->red,
2602                              color->green,
2603                              color->blue,
2604                              color->alpha * t);
2605
2606       cairo_move_to (cr,
2607                      (radius - inset) * xscale,
2608                      (radius - inset) * yscale);
2609       cairo_line_to (cr,
2610                      radius * xscale,
2611                      radius * yscale);
2612
2613       cairo_stroke (cr);
2614     }
2615
2616   cairo_restore (cr);
2617 }
2618
2619 static void
2620 render_spinner (GtkThemingEngine *engine,
2621                 cairo_t          *cr,
2622                 gdouble           x,
2623                 gdouble           y,
2624                 gdouble           width,
2625                 gdouble           height)
2626 {
2627   GtkStateFlags state;
2628   GdkRGBA color;
2629   gdouble radius;
2630
2631   state = gtk_theming_engine_get_state (engine);
2632   radius = MIN (width / 2, height / 2);
2633
2634   gtk_theming_engine_get_color (engine, state, &color);
2635
2636   cairo_save (cr);
2637   cairo_translate (cr, x + width / 2, y + height / 2);
2638
2639   _gtk_css_shadows_value_paint_spinner (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_ICON_SHADOW),
2640                                         cr,
2641                                         radius,
2642                                         -1);
2643
2644   _gtk_theming_engine_paint_spinner (cr,
2645                                      radius,
2646                                      -1,
2647                                      &color);
2648
2649   cairo_restore (cr);
2650 }
2651
2652 static void
2653 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2654                                     cairo_t          *cr,
2655                                     gdouble           x,
2656                                     gdouble           y,
2657                                     gdouble           width,
2658                                     gdouble           height)
2659 {
2660   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
2661     {
2662       render_spinner (engine, cr, x, y, width, height);
2663     }
2664   else
2665     {
2666       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2667       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2668     }
2669 }
2670
2671 static GdkPixbuf *
2672 scale_or_ref (GdkPixbuf *src,
2673               gint       width,
2674               gint       height)
2675 {
2676   if (width == gdk_pixbuf_get_width (src) &&
2677       height == gdk_pixbuf_get_height (src))
2678     return g_object_ref (src);
2679   else
2680     return gdk_pixbuf_scale_simple (src,
2681                                     width, height,
2682                                     GDK_INTERP_BILINEAR);
2683 }
2684
2685 static gboolean
2686 lookup_icon_size (GtkThemingEngine *engine,
2687                   GtkIconSize       size,
2688                   gint             *width,
2689                   gint             *height)
2690 {
2691   GdkScreen *screen;
2692   GtkSettings *settings;
2693
2694   screen = gtk_theming_engine_get_screen (engine);
2695   settings = gtk_settings_get_for_screen (screen);
2696
2697   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
2698 }
2699
2700 static void
2701 colorshift_source (cairo_t *cr,
2702                    gdouble shift)
2703 {
2704   cairo_pattern_t *source;
2705
2706   cairo_save (cr);
2707   cairo_paint (cr);
2708
2709   source = cairo_pattern_reference (cairo_get_source (cr));
2710
2711   cairo_set_source_rgb (cr, shift, shift, shift);
2712   cairo_set_operator (cr, CAIRO_OPERATOR_COLOR_DODGE);
2713
2714   cairo_mask (cr, source);
2715
2716   cairo_pattern_destroy (source);
2717   cairo_restore (cr);
2718 }
2719
2720 static GdkPixbuf *
2721 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
2722                                        const GtkIconSource *source,
2723                                        GtkIconSize          size)
2724 {
2725   GdkPixbuf *scaled;
2726   GdkPixbuf *stated;
2727   GdkPixbuf *base_pixbuf;
2728   GtkStateFlags state;
2729   gint width = 1;
2730   gint height = 1;
2731   cairo_t *cr;
2732   cairo_surface_t *surface;
2733
2734   base_pixbuf = gtk_icon_source_get_pixbuf (source);
2735   state = gtk_theming_engine_get_state (engine);
2736
2737   g_return_val_if_fail (base_pixbuf != NULL, NULL);
2738
2739   if (size != (GtkIconSize) -1 &&
2740       !lookup_icon_size (engine, size, &width, &height))
2741     {
2742       g_warning (G_STRLOC ": invalid icon size '%d'", size);
2743       return NULL;
2744     }
2745
2746   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
2747    * leave it alone.
2748    */
2749   if (size != (GtkIconSize) -1 &&
2750       gtk_icon_source_get_size_wildcarded (source))
2751     scaled = scale_or_ref (base_pixbuf, width, height);
2752   else
2753     scaled = g_object_ref (base_pixbuf);
2754
2755   /* If the state was wildcarded, then generate a state. */
2756   if (gtk_icon_source_get_state_wildcarded (source))
2757     {
2758       if (state & GTK_STATE_FLAG_INSENSITIVE)
2759         {
2760           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2761                                                 gdk_pixbuf_get_width (scaled),
2762                                                 gdk_pixbuf_get_height (scaled));
2763           cr = cairo_create (surface);
2764           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2765           cairo_paint_with_alpha (cr, 0.5);
2766
2767           cairo_destroy (cr);
2768
2769           g_object_unref (scaled);
2770           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2771                                                 cairo_image_surface_get_width (surface),
2772                                                 cairo_image_surface_get_height (surface));
2773           cairo_surface_destroy (surface);
2774         }
2775       else if (state & GTK_STATE_FLAG_PRELIGHT)
2776         {
2777           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2778                                                 gdk_pixbuf_get_width (scaled),
2779                                                 gdk_pixbuf_get_height (scaled));
2780
2781           cr = cairo_create (surface);
2782           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2783           colorshift_source (cr, 0.10);
2784
2785           cairo_destroy (cr);
2786
2787           g_object_unref (scaled);
2788           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2789                                                 cairo_image_surface_get_width (surface),
2790                                                 cairo_image_surface_get_height (surface));
2791           cairo_surface_destroy (surface);
2792         }
2793       else
2794         stated = scaled;
2795     }
2796   else
2797     stated = scaled;
2798
2799   return stated;
2800 }
2801
2802 static void
2803 gtk_theming_engine_render_icon (GtkThemingEngine *engine,
2804                                 cairo_t *cr,
2805                                 GdkPixbuf *pixbuf,
2806                                 gdouble x,
2807                                 gdouble y)
2808 {
2809   cairo_save (cr);
2810
2811   gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
2812
2813   _gtk_css_shadows_value_paint_icon (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_ICON_SHADOW), cr);
2814
2815   cairo_paint (cr);
2816
2817   cairo_restore (cr);
2818 }
2819