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 gboolean
 585 gtk_theming_engine_state_is_running (GtkThemingEngine *engine,
 586                                      GtkStateType      state,
 587                                      gdouble          *progress)
 588 {
 589   GtkThemingEnginePrivate *priv;
 590
 591   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 592
 593   priv = engine->priv;
 594   return gtk_style_context_state_is_running (priv->context, state, progress);
 595 }
 596
 597 /**
 598  * gtk_theming_engine_get_path:
 599  * @engine: a #GtkThemingEngine
 600  *
 601  * Returns the widget path used for style matching.
 602  *
 603  * Returns: (transfer none): A #GtkWidgetPath
 604  *
 605  * Since: 3.0
 606  **/
 607 const GtkWidgetPath *
 608 gtk_theming_engine_get_path (GtkThemingEngine *engine)
 609 {
 610   GtkThemingEnginePrivate *priv;
 611
 612   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 613
 614   priv = engine->priv;
 615   return gtk_style_context_get_path (priv->context);
 616 }
 617
 618 /**
 619  * gtk_theming_engine_has_class:
 620  * @engine: a #GtkThemingEngine
 621  * @style_class: class name to look up
 622  *
 623  * Returns %TRUE if the currently rendered contents have
 624  * defined the given class name.
 625  *
 626  * Returns: %TRUE if @engine has @class_name defined
 627  *
 628  * Since: 3.0
 629  **/
 630 gboolean
 631 gtk_theming_engine_has_class (GtkThemingEngine *engine,
 632                               const gchar      *style_class)
 633 {
 634   GtkThemingEnginePrivate *priv;
 635
 636   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 637
 638   priv = engine->priv;
 639   return gtk_style_context_has_class (priv->context, style_class);
 640 }
 641
 642 /**
 643  * gtk_theming_engine_has_region:
 644  * @engine: a #GtkThemingEngine
 645  * @style_region: a region name
 646  * @flags: (out) (allow-none): return location for region flags
 647  *
 648  * Returns %TRUE if the currently rendered contents have the
 649  * region defined. If @flags_return is not %NULL, it is set
 650  * to the flags affecting the region.
 651  *
 652  * Returns: %TRUE if region is defined
 653  *
 654  * Since: 3.0
 655  **/
 656 gboolean
 657 gtk_theming_engine_has_region (GtkThemingEngine *engine,
 658                                const gchar      *style_region,
 659                                GtkRegionFlags   *flags)
 660 {
 661   GtkThemingEnginePrivate *priv;
 662
 663   if (flags)
 664     *flags = 0;
 665
 666   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 667
 668   priv = engine->priv;
 669   return gtk_style_context_has_region (priv->context, style_region, flags);
 670 }
 671
 672 /**
 673  * gtk_theming_engine_get_direction:
 674  * @engine: a #GtkThemingEngine
 675  *
 676  * Returns the widget direction used for rendering.
 677  *
 678  * Returns: the widget direction
 679  *
 680  * Since: 3.0
 681  **/
 682 GtkTextDirection
 683 gtk_theming_engine_get_direction (GtkThemingEngine *engine)
 684 {
 685   GtkThemingEnginePrivate *priv;
 686
 687   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), GTK_TEXT_DIR_LTR);
 688
 689   priv = engine->priv;
 690   return gtk_style_context_get_direction (priv->context);
 691 }
 692
 693 /**
 694  * gtk_theming_engine_get_junction_sides:
 695  * @engine: a #GtkThemingEngine
 696  *
 697  * Returns the widget direction used for rendering.
 698  *
 699  * Returns: the widget direction
 700  *
 701  * Since: 3.0
 702  **/
 703 GtkJunctionSides
 704 gtk_theming_engine_get_junction_sides (GtkThemingEngine *engine)
 705 {
 706   GtkThemingEnginePrivate *priv;
 707
 708   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 709
 710   priv = engine->priv;
 711   return gtk_style_context_get_junction_sides (priv->context);
 712 }
 713
 714 /**
 715  * gtk_theming_engine_get_color:
 716  * @engine: a #GtkThemingEngine
 717  * @state: state to retrieve the color for
 718  * @color: (out): return value for the foreground color
 719  *
 720  * Gets the foreground color for a given state.
 721  *
 722  * Since: 3.0
 723  **/
 724 void
 725 gtk_theming_engine_get_color (GtkThemingEngine *engine,
 726                               GtkStateFlags     state,
 727                               GdkRGBA          *color)
 728 {
 729   GtkThemingEnginePrivate *priv;
 730
 731   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 732
 733   priv = engine->priv;
 734   gtk_style_context_get_color (priv->context, state, color);
 735 }
 736
 737 /**
 738  * gtk_theming_engine_get_background_color:
 739  * @engine: a #GtkThemingEngine
 740  * @state: state to retrieve the color for
 741  * @color: (out): return value for the background color
 742  *
 743  * Gets the background color for a given state.
 744  *
 745  * Since: 3.0
 746  **/
 747 void
 748 gtk_theming_engine_get_background_color (GtkThemingEngine *engine,
 749                                          GtkStateFlags     state,
 750                                          GdkRGBA          *color)
 751 {
 752   GtkThemingEnginePrivate *priv;
 753
 754   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 755
 756   priv = engine->priv;
 757   gtk_style_context_get_background_color (priv->context, state, color);
 758 }
 759
 760 /**
 761  * gtk_theming_engine_get_border_color:
 762  * @engine: a #GtkThemingEngine
 763  * @state: state to retrieve the color for
 764  * @color: (out): return value for the border color
 765  *
 766  * Gets the border color for a given state.
 767  *
 768  * Since: 3.0
 769  **/
 770 void
 771 gtk_theming_engine_get_border_color (GtkThemingEngine *engine,
 772                                      GtkStateFlags     state,
 773                                      GdkRGBA          *color)
 774 {
 775   GtkThemingEnginePrivate *priv;
 776
 777   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 778
 779   priv = engine->priv;
 780   gtk_style_context_get_border_color (priv->context, state, color);
 781 }
 782
 783 /**
 784  * gtk_theming_engine_get_border:
 785  * @engine: a #GtkthemingEngine
 786  * @state: state to retrieve the border for
 787  * @border: (out): return value for the border settings
 788  *
 789  * Gets the border for a given state as a #GtkBorder.
 790  *
 791  * Since: 3.0
 792  **/
 793 void
 794 gtk_theming_engine_get_border (GtkThemingEngine *engine,
 795                                GtkStateFlags     state,
 796                                GtkBorder        *border)
 797 {
 798   GtkThemingEnginePrivate *priv;
 799
 800   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 801
 802   priv = engine->priv;
 803   gtk_style_context_get_border (priv->context, state, border);
 804 }
 805
 806 /**
 807  * gtk_theming_engine_get_padding:
 808  * @engine: a #GtkthemingEngine
 809  * @state: state to retrieve the padding for
 810  * @padding: (out): return value for the padding settings
 811  *
 812  * Gets the padding for a given state as a #GtkBorder.
 813  *
 814  * Since: 3.0
 815  **/
 816 void
 817 gtk_theming_engine_get_padding (GtkThemingEngine *engine,
 818                                 GtkStateFlags     state,
 819                                 GtkBorder        *padding)
 820 {
 821   GtkThemingEnginePrivate *priv;
 822
 823   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 824
 825   priv = engine->priv;
 826   gtk_style_context_get_padding (priv->context, state, padding);
 827 }
 828
 829 /**
 830  * gtk_theming_engine_get_margin:
 831  * @engine: a #GtkThemingEngine
 832  * @state: state to retrieve the border for
 833  * @margin: (out): return value for the margin settings
 834  *
 835  * Gets the margin for a given state as a #GtkBorder.
 836  *
 837  * Since: 3.0
 838  **/
 839 void
 840 gtk_theming_engine_get_margin (GtkThemingEngine *engine,
 841                                GtkStateFlags     state,
 842                                GtkBorder        *margin)
 843 {
 844   GtkThemingEnginePrivate *priv;
 845
 846   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 847
 848   priv = engine->priv;
 849   gtk_style_context_get_margin (priv->context, state, margin);
 850 }
 851
 852 /**
 853  * gtk_theming_engine_get_font:
 854  * @engine: a #GtkThemingEngine
 855  * @state: state to retrieve the font for
 856  *
 857  * Returns the font description for a given state.
 858  *
 859  * Returns: (transfer none): the #PangoFontDescription for the given
 860  *          state. This object is owned by GTK+ and should not be
 861  *          freed.
 862  *
 863  * Since: 3.0
 864  **/
 865 const PangoFontDescription *
 866 gtk_theming_engine_get_font (GtkThemingEngine *engine,
 867                              GtkStateFlags     state)
 868 {
 869   GtkThemingEnginePrivate *priv;
 870
 871   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 872
 873   priv = engine->priv;
 874   return gtk_style_context_get_font (priv->context, state);
 875 }
 876
 877 /* GtkThemingModule */
 878
 879 static gboolean
 880 gtk_theming_module_load (GTypeModule *type_module)
 881 {
 882   GtkThemingModule *theming_module;
 883   GModule *module;
 884   gchar *name, *module_path;
 885
 886   theming_module = GTK_THEMING_MODULE (type_module);
 887   name = theming_module->name;
 888   module_path = _gtk_find_module (name, "theming-engines");
 889
 890   if (!module_path)
 891     return FALSE;
 892
 893   module = g_module_open (module_path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 894   g_free (module_path);
 895
 896   if (!module)
 897     return FALSE;
 898
 899   if (!g_module_symbol (module, "theme_init",
 900                         (gpointer *) &theming_module->init) ||
 901       !g_module_symbol (module, "theme_exit",
 902                         (gpointer *) &theming_module->exit) ||
 903       !g_module_symbol (module, "create_engine",
 904                         (gpointer *) &theming_module->create_engine))
 905     {
 906       g_module_close (module);
 907
 908       return FALSE;
 909     }
 910
 911   theming_module->module = module;
 912
 913   theming_module->init (G_TYPE_MODULE (theming_module));
 914
 915   return TRUE;
 916 }
 917
 918 static void
 919 gtk_theming_module_unload (GTypeModule *type_module)
 920 {
 921   GtkThemingModule *theming_module;
 922
 923   theming_module = GTK_THEMING_MODULE (type_module);
 924
 925   theming_module->exit ();
 926
 927   g_module_close (theming_module->module);
 928
 929   theming_module->module = NULL;
 930   theming_module->init = NULL;
 931   theming_module->exit = NULL;
 932   theming_module->create_engine = NULL;
 933 }
 934
 935 static void
 936 gtk_theming_module_class_init (GtkThemingModuleClass *klass)
 937 {
 938   GTypeModuleClass *module_class = G_TYPE_MODULE_CLASS (klass);
 939
 940   module_class->load = gtk_theming_module_load;
 941   module_class->unload = gtk_theming_module_unload;
 942 }
 943
 944 static void
 945 gtk_theming_module_init (GtkThemingModule *module)
 946 {
 947 }
 948
 949 /**
 950  * gtk_theming_engine_load:
 951  * @name: Theme engine name to load
 952  *
 953  * Loads and initializes a theming engine module from the
 954  * standard directories.
 955  *
 956  * Returns: (transfer none): A theming engine, or %NULL if
 957  * the engine @name doesn't exist.
 958  **/
 959 GtkThemingEngine *
 960 gtk_theming_engine_load (const gchar *name)
 961 {
 962   static GHashTable *engines = NULL;
 963   static GtkThemingEngine *default_engine;
 964   GtkThemingEngine *engine = NULL;
 965
 966   if (name)
 967     {
 968       if (!engines)
 969         engines = g_hash_table_new (g_str_hash, g_str_equal);
 970
 971       engine = g_hash_table_lookup (engines, name);
 972
 973       if (!engine)
 974         {
 975           GtkThemingModule *module;
 976
 977           module = g_object_new (GTK_TYPE_THEMING_MODULE, NULL);
 978           g_type_module_set_name (G_TYPE_MODULE (module), name);
 979           module->name = g_strdup (name);
 980
 981           if (module && g_type_module_use (G_TYPE_MODULE (module)))
 982             {
 983               engine = (module->create_engine) ();
 984
 985               if (engine)
 986                 g_hash_table_insert (engines, module->name, engine);
 987             }
 988         }
 989     }
 990   else
 991     {
 992       if (G_UNLIKELY (!default_engine))
 993         default_engine = g_object_new (GTK_TYPE_THEMING_ENGINE, NULL);
 994
 995       engine = default_engine;
 996     }
 997
 998   return engine;
 999 }
1000
1001 /**
1002  * gtk_theming_engine_get_screen:
1003  * @engine: a #GtkThemingEngine
1004  *
1005  * Returns the #GdkScreen to which @engine currently rendering to.
1006  *
1007  * Returns: (transfer none): a #GdkScreen, or %NULL.
1008  **/
1009 GdkScreen *
1010 gtk_theming_engine_get_screen (GtkThemingEngine *engine)
1011 {
1012   GtkThemingEnginePrivate *priv;
1013
1014   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
1015
1016   priv = engine->priv;
1017   return gtk_style_context_get_screen (priv->context);
1018 }
1019
1020 /* Paint method implementations */
1021 static void
1022 gtk_theming_engine_render_check (GtkThemingEngine *engine,
1023                                  cairo_t          *cr,
1024                                  gdouble           x,
1025                                  gdouble           y,
1026                                  gdouble           width,
1027                                  gdouble           height)
1028 {
1029   GdkRGBA fg_color, bg_color;
1030   GtkStateFlags flags;
1031   gint exterior_size, interior_size, thickness, pad;
1032   GtkBorderStyle border_style;
1033   GtkBorder border;
1034   gint border_width;
1035   GtkThemingBackground bg;
1036
1037   _gtk_theming_background_init (&bg, engine,
1038                                 x, y,
1039                                 width, height,
1040                                 gtk_theming_engine_get_junction_sides (engine));
1041
1042   if (_gtk_theming_background_has_background_image (&bg))
1043     {
1044       _gtk_theming_background_render (&bg, cr);
1045       return;
1046     }
1047
1048   flags = gtk_theming_engine_get_state (engine);
1049   cairo_save (cr);
1050
1051   gtk_theming_engine_get_color (engine, flags, &fg_color);
1052   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1053   gtk_theming_engine_get_border (engine, flags, &border);
1054
1055   gtk_theming_engine_get (engine, flags,
1056                           "border-style", &border_style,
1057                           NULL);
1058
1059   border_width = MIN (MIN (border.top, border.bottom),
1060                       MIN (border.left, border.right));
1061   exterior_size = MIN (width, height);
1062
1063   if (exterior_size % 2 == 0) /* Ensure odd */
1064     exterior_size -= 1;
1065
1066   /* FIXME: thickness */
1067   thickness = 1;
1068   pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1069   interior_size = MAX (1, exterior_size - 2 * pad);
1070
1071   if (interior_size < 7)
1072     {
1073       interior_size = 7;
1074       pad = MAX (0, (exterior_size - interior_size) / 2);
1075     }
1076
1077   x -= (1 + exterior_size - (gint) width) / 2;
1078   y -= (1 + exterior_size - (gint) height) / 2;
1079
1080   if (border_style == GTK_BORDER_STYLE_SOLID)
1081     {
1082       GdkRGBA border_color;
1083
1084       cairo_set_line_width (cr, border_width);
1085       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1086
1087       cairo_rectangle (cr, x + 0.5, y + 0.5, exterior_size - 1, exterior_size - 1);
1088       gdk_cairo_set_source_rgba (cr, &bg_color);
1089       cairo_fill_preserve (cr);
1090
1091       gdk_cairo_set_source_rgba (cr, &border_color);
1092       cairo_stroke (cr);
1093     }
1094
1095   gdk_cairo_set_source_rgba (cr, &fg_color);
1096
1097   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1098     {
1099       int line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1100
1101       cairo_rectangle (cr,
1102                        x + pad,
1103                        y + pad + (1 + interior_size - line_thickness) / 2,
1104                        interior_size,
1105                        line_thickness);
1106       cairo_fill (cr);
1107     }
1108   else
1109     {
1110       gdouble progress;
1111       gboolean running;
1112
1113       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1114
1115       if ((flags & GTK_STATE_FLAG_ACTIVE) || running)
1116         {
1117           if (!running)
1118             progress = 1;
1119
1120           cairo_translate (cr,
1121                            x + pad, y + pad);
1122
1123           cairo_scale (cr, interior_size / 7., interior_size / 7.);
1124
1125           cairo_rectangle (cr, 0, 0, 7 * progress, 7);
1126           cairo_clip (cr);
1127
1128           cairo_move_to  (cr, 7.0, 0.0);
1129           cairo_line_to  (cr, 7.5, 1.0);
1130           cairo_curve_to (cr, 5.3, 2.0,
1131                           4.3, 4.0,
1132                           3.5, 7.0);
1133           cairo_curve_to (cr, 3.0, 5.7,
1134                           1.3, 4.7,
1135                           0.0, 4.7);
1136           cairo_line_to  (cr, 0.2, 3.5);
1137           cairo_curve_to (cr, 1.1, 3.5,
1138                           2.3, 4.3,
1139                           3.0, 5.0);
1140           cairo_curve_to (cr, 1.0, 3.9,
1141                           2.4, 4.1,
1142                           3.2, 4.9);
1143           cairo_curve_to (cr, 3.5, 3.1,
1144                           5.2, 2.0,
1145                           7.0, 0.0);
1146
1147           cairo_fill (cr);
1148         }
1149     }
1150
1151   cairo_restore (cr);
1152 }
1153
1154 static void
1155 gtk_theming_engine_render_option (GtkThemingEngine *engine,
1156                                   cairo_t          *cr,
1157                                   gdouble           x,
1158                                   gdouble           y,
1159                                   gdouble           width,
1160                                   gdouble           height)
1161 {
1162   GtkStateFlags flags;
1163   GdkRGBA fg_color, bg_color;
1164   gint exterior_size, interior_size, pad, thickness, border_width;
1165   GtkBorderStyle border_style;
1166   GtkBorder border;
1167   GtkThemingBackground bg;
1168
1169   _gtk_theming_background_init (&bg, engine,
1170                                 x, y,
1171                                 width, height,
1172                                 gtk_theming_engine_get_junction_sides (engine));
1173
1174   if (_gtk_theming_background_has_background_image (&bg))
1175     {
1176       _gtk_theming_background_render (&bg, cr);
1177       return;
1178     }
1179
1180   flags = gtk_theming_engine_get_state (engine);
1181
1182   cairo_save (cr);
1183
1184   gtk_theming_engine_get_color (engine, flags, &fg_color);
1185   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1186   gtk_theming_engine_get_border (engine, flags, &border);
1187
1188   gtk_theming_engine_get (engine, flags,
1189                           "border-style", &border_style,
1190                           NULL);
1191
1192   exterior_size = MIN (width, height);
1193   border_width = MIN (MIN (border.top, border.bottom),
1194                       MIN (border.left, border.right));
1195
1196   if (exterior_size % 2 == 0) /* Ensure odd */
1197     exterior_size -= 1;
1198
1199   x -= (1 + exterior_size - width) / 2;
1200   y -= (1 + exterior_size - height) / 2;
1201
1202   if (border_style == GTK_BORDER_STYLE_SOLID)
1203     {
1204       GdkRGBA border_color;
1205
1206       cairo_set_line_width (cr, border_width);
1207       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1208
1209       cairo_new_sub_path (cr);
1210       cairo_arc (cr,
1211                  x + exterior_size / 2.,
1212                  y + exterior_size / 2.,
1213                  (exterior_size - 1) / 2.,
1214                  0, 2 * G_PI);
1215
1216       gdk_cairo_set_source_rgba (cr, &bg_color);
1217       cairo_fill_preserve (cr);
1218
1219       gdk_cairo_set_source_rgba (cr, &border_color);
1220       cairo_stroke (cr);
1221     }
1222
1223   gdk_cairo_set_source_rgba (cr, &fg_color);
1224
1225   /* FIXME: thickness */
1226   thickness = 1;
1227
1228   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1229     {
1230       gint line_thickness;
1231
1232       pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1233       interior_size = MAX (1, exterior_size - 2 * pad);
1234
1235       if (interior_size < 7)
1236         {
1237           interior_size = 7;
1238           pad = MAX (0, (exterior_size - interior_size) / 2);
1239         }
1240
1241       line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1242
1243       cairo_rectangle (cr,
1244                        x + pad,
1245                        y + pad + (interior_size - line_thickness) / 2.,
1246                        interior_size,
1247                        line_thickness);
1248       cairo_fill (cr);
1249     }
1250   if (flags & GTK_STATE_FLAG_ACTIVE)
1251     {
1252       pad = thickness + MAX (1, 2 * (exterior_size - 2 * thickness) / 9);
1253       interior_size = MAX (1, exterior_size - 2 * pad);
1254
1255       if (interior_size < 5)
1256         {
1257           interior_size = 7;
1258           pad = MAX (0, (exterior_size - interior_size) / 2);
1259         }
1260
1261       cairo_new_sub_path (cr);
1262       cairo_arc (cr,
1263                  x + pad + interior_size / 2.,
1264                  y + pad + interior_size / 2.,
1265                  interior_size / 2.,
1266                  0, 2 * G_PI);
1267       cairo_fill (cr);
1268     }
1269
1270   cairo_restore (cr);
1271 }
1272
1273 static void
1274 add_path_arrow (cairo_t *cr,
1275                 gdouble  angle,
1276                 gdouble  x,
1277                 gdouble  y,
1278                 gdouble  size)
1279 {
1280   cairo_save (cr);
1281
1282   cairo_translate (cr, x + (size / 2), y + (size / 2));
1283   cairo_rotate (cr, angle);
1284
1285   cairo_move_to (cr, 0, - (size / 4));
1286   cairo_line_to (cr, - (size / 2), (size / 4));
1287   cairo_line_to (cr, (size / 2), (size / 4));
1288   cairo_close_path (cr);
1289
1290   cairo_restore (cr);
1291 }
1292
1293 static void
1294 gtk_theming_engine_render_arrow (GtkThemingEngine *engine,
1295                                  cairo_t          *cr,
1296                                  gdouble           angle,
1297                                  gdouble           x,
1298                                  gdouble           y,
1299                                  gdouble           size)
1300 {
1301   GtkStateFlags flags;
1302   GdkRGBA fg_color;
1303
1304   cairo_save (cr);
1305
1306   flags = gtk_theming_engine_get_state (engine);
1307   gtk_theming_engine_get_color (engine, flags, &fg_color);
1308
1309   if (flags & GTK_STATE_FLAG_INSENSITIVE)
1310     {
1311       add_path_arrow (cr, angle, x + 1, y + 1, size);
1312       cairo_set_source_rgb (cr, 1, 1, 1);
1313       cairo_fill (cr);
1314     }
1315
1316   add_path_arrow (cr, angle, x, y, size);
1317   gdk_cairo_set_source_rgba (cr, &fg_color);
1318   cairo_fill (cr);
1319
1320   cairo_restore (cr);
1321 }
1322
1323 static void
1324 add_path_line (cairo_t        *cr,
1325                gdouble         x1,
1326                gdouble         y1,
1327                gdouble         x2,
1328                gdouble         y2)
1329 {
1330   /* Adjust endpoints */
1331   if (y1 == y2)
1332     {
1333       y1 += 0.5;
1334       y2 += 0.5;
1335       x2 += 1;
1336     }
1337   else if (x1 == x2)
1338     {
1339       x1 += 0.5;
1340       x2 += 0.5;
1341       y2 += 1;
1342     }
1343
1344   cairo_move_to (cr, x1, y1);
1345   cairo_line_to (cr, x2, y2);
1346 }
1347
1348 static void
1349 color_shade (const GdkRGBA *color,
1350              gdouble        factor,
1351              GdkRGBA       *color_return)
1352 {
1353   GtkSymbolicColor *literal, *shade;
1354
1355   literal = gtk_symbolic_color_new_literal (color);
1356   shade = gtk_symbolic_color_new_shade (literal, factor);
1357   gtk_symbolic_color_unref (literal);
1358
1359   gtk_symbolic_color_resolve (shade, NULL, color_return);
1360   gtk_symbolic_color_unref (shade);
1361 }
1362
1363 static void
1364 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1365                                       cairo_t          *cr,
1366                                       gdouble           x,
1367                                       gdouble           y,
1368                                       gdouble           width,
1369                                       gdouble           height)
1370 {
1371   GtkThemingBackground bg;
1372
1373   _gtk_theming_background_init (&bg, engine,
1374                                 x, y,
1375                                 width, height,
1376                                 gtk_theming_engine_get_junction_sides (engine));
1377
1378   _gtk_theming_background_render (&bg, cr);
1379 }
1380
1381 static void
1382 gtk_theming_engine_hide_border_sides (GtkBorder *border,
1383                                       guint      hidden_side)
1384 {
1385   if (hidden_side & (1 << GTK_CSS_TOP))
1386     border->top = 0;
1387   if (hidden_side & (1 << GTK_CSS_RIGHT))
1388     border->right = 0;
1389   if (hidden_side & (1 << GTK_CSS_BOTTOM))
1390     border->bottom = 0;
1391   if (hidden_side & (1 << GTK_CSS_LEFT))
1392     border->left = 0;
1393 }
1394
1395 static void
1396 render_frame_fill (cairo_t       *cr,
1397                    GtkRoundedBox *border_box,
1398                    GtkBorder     *border,
1399                    GdkRGBA        colors[4],
1400                    guint          hidden_side)
1401 {
1402   GtkRoundedBox padding_box;
1403   guint i, j;
1404
1405   padding_box = *border_box;
1406   _gtk_rounded_box_shrink (&padding_box, border->top, border->right, border->bottom, border->left);
1407
1408   if (hidden_side == 0 &&
1409       gdk_rgba_equal (&colors[0], &colors[1]) &&
1410       gdk_rgba_equal (&colors[0], &colors[2]) &&
1411       gdk_rgba_equal (&colors[0], &colors[3]))
1412     {
1413       gdk_cairo_set_source_rgba (cr, &colors[0]);
1414
1415       _gtk_rounded_box_path (border_box, cr);
1416       _gtk_rounded_box_path (&padding_box, cr);
1417       cairo_fill (cr);
1418     }
1419   else
1420     {
1421       for (i = 0; i < 4; i++)
1422         {
1423           if (hidden_side & (1 << i))
1424             continue;
1425
1426           for (j = 0; j < 4; j++)
1427             {
1428               if (hidden_side & (1 << j))
1429                 continue;
1430
1431               if (i == j ||
1432                   (gdk_rgba_equal (&colors[i], &colors[j])))
1433                 {
1434                   /* We were already painted when i == j */
1435                   if (i > j)
1436                     break;
1437
1438                   if (j == 0)
1439                     _gtk_rounded_box_path_top (border_box, &padding_box, cr);
1440                   else if (j == 1)
1441                     _gtk_rounded_box_path_right (border_box, &padding_box, cr);
1442                   else if (j == 2)
1443                     _gtk_rounded_box_path_bottom (border_box, &padding_box, cr);
1444                   else if (j == 3)
1445                     _gtk_rounded_box_path_left (border_box, &padding_box, cr);
1446                 }
1447             }
1448           /* We were already painted when i == j */
1449           if (i > j)
1450             continue;
1451
1452           gdk_cairo_set_source_rgba (cr, &colors[i]);
1453
1454           cairo_fill (cr);
1455         }
1456     }
1457 }
1458
1459 static void
1460 set_stroke_style (cairo_t        *cr,
1461                   double          line_width,
1462                   GtkBorderStyle  style,
1463                   double          length)
1464 {
1465   double segments[2];
1466   double n;
1467
1468   cairo_set_line_width (cr, line_width);
1469
1470   if (style == GTK_BORDER_STYLE_DOTTED)
1471     {
1472       n = round (0.5 * length / line_width);
1473
1474       segments[0] = 0;
1475       segments[1] = n ? length / n : 2;
1476       cairo_set_dash (cr, segments, G_N_ELEMENTS (segments), 0);
1477
1478       cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
1479       cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
1480     }
1481   else
1482     {
1483       n = length / line_width;
1484       /* Optimize the common case of an integer-sized rectangle
1485        * Again, we care about focus rectangles.
1486        */
1487       if (n == nearbyint (n))
1488         {
1489           segments[0] = 1;
1490           segments[1] = 2;
1491         }
1492       else
1493         {
1494           n = round ((1. / 3) * n);
1495
1496           segments[0] = n ? (1. / 3) * length / n : 1;
1497           segments[1] = 2 * segments[1];
1498         }
1499       cairo_set_dash (cr, segments, G_N_ELEMENTS (segments), 0);
1500
1501       cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1502       cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
1503     }
1504 }
1505
1506 static int
1507 get_border_side (GtkBorder  *border,
1508                  GtkCssSide  side)
1509 {
1510   switch (side)
1511     {
1512     case GTK_CSS_TOP:
1513       return border->top;
1514     case GTK_CSS_RIGHT:
1515       return border->right;
1516     case GTK_CSS_BOTTOM:
1517       return border->bottom;
1518     case GTK_CSS_LEFT:
1519       return border->left;
1520     default:
1521       g_assert_not_reached ();
1522       return 0;
1523     }
1524 }
1525
1526 static void
1527 render_frame_stroke (cairo_t       *cr,
1528                      GtkRoundedBox *border_box,
1529                      GtkBorder     *border,
1530                      GdkRGBA        colors[4],
1531                      guint          hidden_side,
1532                      GtkBorderStyle stroke_style)
1533 {
1534   gboolean different_colors, different_borders;
1535   GtkRoundedBox stroke_box;
1536   guint i;
1537
1538   different_colors = !gdk_rgba_equal (&colors[0], &colors[1]) ||
1539                      !gdk_rgba_equal (&colors[0], &colors[2]) ||
1540                      !gdk_rgba_equal (&colors[0], &colors[3]);
1541   different_borders = border->top != border->right ||
1542                       border->top != border->bottom ||
1543                       border->top != border->left;
1544
1545   stroke_box = *border_box;
1546   _gtk_rounded_box_shrink (&stroke_box,
1547                            border->top / 2.0,
1548                            border->right / 2.0,
1549                            border->bottom / 2.0,
1550                            border->left / 2.0);
1551
1552   if (!different_colors && !different_borders && hidden_side == 0)
1553     {
1554       double length = 0;
1555
1556       /* FAST PATH:
1557        * Mostly expected to trigger for focus rectangles */
1558       for (i = 0; i < 4; i++)
1559         {
1560           length += _gtk_rounded_box_guess_length (&stroke_box, i);
1561           _gtk_rounded_box_path_side (&stroke_box, cr, i);
1562         }
1563
1564       gdk_cairo_set_source_rgba (cr, &colors[0]);
1565       set_stroke_style (cr, border->top, stroke_style, length);
1566       cairo_stroke (cr);
1567     }
1568   else
1569     {
1570       GtkRoundedBox padding_box;
1571
1572       padding_box = *border_box;
1573       _gtk_rounded_box_path (&padding_box, cr);
1574       _gtk_rounded_box_shrink (&padding_box,
1575                                border->top,
1576                                border->right,
1577                                border->bottom,
1578                                border->left);
1579
1580       for (i = 0; i < 4; i++)
1581         {
1582           if (hidden_side & (1 << i))
1583             continue;
1584
1585           cairo_save (cr);
1586
1587           if (i == 0)
1588             _gtk_rounded_box_path_top (border_box, &padding_box, cr);
1589           else if (i == 1)
1590             _gtk_rounded_box_path_right (border_box, &padding_box, cr);
1591           else if (i == 2)
1592             _gtk_rounded_box_path_bottom (border_box, &padding_box, cr);
1593           else if (i == 3)
1594             _gtk_rounded_box_path_left (border_box, &padding_box, cr);
1595           cairo_clip (cr);
1596
1597           _gtk_rounded_box_path_side (&stroke_box, cr, i);
1598
1599           gdk_cairo_set_source_rgba (cr, &colors[i]);
1600           set_stroke_style (cr,
1601                             get_border_side (border, i),
1602                             stroke_style,
1603                             _gtk_rounded_box_guess_length (&stroke_box, i));
1604           cairo_stroke (cr);
1605
1606           cairo_restore (cr);
1607         }
1608     }
1609 }
1610
1611 static void
1612 render_border (cairo_t       *cr,
1613                GtkRoundedBox *border_box,
1614                GtkBorder     *border,
1615                guint          hidden_side,
1616                GdkRGBA        colors[4],
1617                GtkBorderStyle border_style[4])
1618 {
1619   guint i, j;
1620
1621   cairo_save (cr);
1622
1623   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
1624
1625   for (i = 0; i < 4; i++)
1626     {
1627       if (hidden_side & (1 << i))
1628         continue;
1629
1630       switch (border_style[i])
1631         {
1632         case GTK_BORDER_STYLE_NONE:
1633         case GTK_BORDER_STYLE_HIDDEN:
1634         case GTK_BORDER_STYLE_SOLID:
1635           break;
1636         case GTK_BORDER_STYLE_INSET:
1637           if (i == 1 || i == 2)
1638             color_shade (&colors[i], 1.8, &colors[i]);
1639           break;
1640         case GTK_BORDER_STYLE_OUTSET:
1641           if (i == 0 || i == 3)
1642             color_shade (&colors[i], 1.8, &colors[i]);
1643           break;
1644         case GTK_BORDER_STYLE_DOTTED:
1645         case GTK_BORDER_STYLE_DASHED:
1646           {
1647             guint dont_draw = hidden_side;
1648
1649             for (j = 0; j < 4; j++)
1650               {
1651                 if (border_style[j] == border_style[i])
1652                   hidden_side |= (1 << j);
1653                 else
1654                   dont_draw |= (1 << j);
1655               }
1656
1657             render_frame_stroke (cr, border_box, border, colors, dont_draw, border_style[i]);
1658           }
1659           break;
1660         case GTK_BORDER_STYLE_DOUBLE:
1661           {
1662             GtkRoundedBox other_box;
1663             GtkBorder other_border;
1664             guint dont_draw = hidden_side;
1665
1666             for (j = 0; j < 4; j++)
1667               {
1668                 if (border_style[j] == GTK_BORDER_STYLE_DOUBLE)
1669                   hidden_side |= (1 << j);
1670                 else
1671                   dont_draw |= (1 << j);
1672               }
1673             other_border.top = (border->top + 2) / 3;
1674             other_border.right = (border->right + 2) / 3;
1675             other_border.bottom = (border->bottom + 2) / 3;
1676             other_border.left = (border->left + 2) / 3;
1677
1678             render_frame_fill (cr, border_box, &other_border, colors, dont_draw);
1679
1680             other_box = *border_box;
1681             _gtk_rounded_box_shrink (&other_box,
1682                                      border->top - other_border.top,
1683                                      border->right - other_border.right,
1684                                      border->bottom - other_border.bottom,
1685                                      border->left - other_border.left);
1686             render_frame_fill (cr, &other_box, &other_border, colors, dont_draw);
1687           }
1688         case GTK_BORDER_STYLE_GROOVE:
1689         case GTK_BORDER_STYLE_RIDGE:
1690           {
1691             GtkRoundedBox other_box;
1692             GdkRGBA other_colors[4];
1693             guint dont_draw = hidden_side;
1694             GtkBorder other_border;
1695
1696             for (j = 0; j < 4; j++)
1697               {
1698                 other_colors[j] = colors[j];
1699                 if ((j == 0 || j == 3) ^ (border_style[j] == GTK_BORDER_STYLE_RIDGE))
1700                   color_shade (&other_colors[j], 1.8, &other_colors[j]);
1701                 else
1702                   color_shade (&colors[j], 1.8, &colors[j]);
1703                 if (border_style[j] == GTK_BORDER_STYLE_GROOVE ||
1704                     border_style[j] == GTK_BORDER_STYLE_RIDGE)
1705                   hidden_side |= (1 << j);
1706                 else
1707                   dont_draw |= (1 << j);
1708               }
1709             other_border.top = border->top / 2;
1710             other_border.right = border->right / 2;
1711             other_border.bottom = border->bottom / 2;
1712             other_border.left = border->left / 2;
1713
1714             render_frame_fill (cr, border_box, &other_border, colors, dont_draw);
1715
1716             other_box = *border_box;
1717             _gtk_rounded_box_shrink (&other_box,
1718                                      other_border.top, other_border.right,
1719                                      other_border.bottom, other_border.left);
1720             other_border.top = border->top - other_border.top;
1721             other_border.right = border->right - other_border.right;
1722             other_border.bottom = border->bottom - other_border.bottom;
1723             other_border.left = border->left - other_border.left;
1724             render_frame_fill (cr, &other_box, &other_border, other_colors, dont_draw);
1725           }
1726           break;
1727         default:
1728           g_assert_not_reached ();
1729           break;
1730         }
1731     }
1732
1733   render_frame_fill (cr, border_box, border, colors, hidden_side);
1734
1735   cairo_restore (cr);
1736 }
1737
1738 static void
1739 render_frame_internal (GtkThemingEngine *engine,
1740                        cairo_t          *cr,
1741                        gdouble           x,
1742                        gdouble           y,
1743                        gdouble           width,
1744                        gdouble           height,
1745                        guint             hidden_side,
1746                        GtkJunctionSides  junction)
1747 {
1748   GtkBorderImage border_image;
1749   GtkStateFlags state;
1750   GtkBorderStyle border_style[4];
1751   GtkRoundedBox border_box;
1752   gdouble progress;
1753   gboolean running;
1754   GtkBorder border;
1755   GdkRGBA *alloc_colors[4];
1756   GdkRGBA colors[4];
1757   guint i;
1758
1759   state = gtk_theming_engine_get_state (engine);
1760
1761   gtk_theming_engine_get_border (engine, state, &border);
1762   gtk_theming_engine_hide_border_sides (&border, hidden_side);
1763
1764   if (_gtk_border_image_init (&border_image, engine))
1765     _gtk_border_image_render (&border_image, &border, cr, x, y, width, height);
1766   else
1767     {
1768       gtk_theming_engine_get (engine, state,
1769                               "border-top-style", &border_style[0],
1770                               "border-right-style", &border_style[1],
1771                               "border-bottom-style", &border_style[2],
1772                               "border-left-style", &border_style[3],
1773                               "border-top-color", &alloc_colors[0],
1774                               "border-right-color", &alloc_colors[1],
1775                               "border-bottom-color", &alloc_colors[2],
1776                               "border-left-color", &alloc_colors[3],
1777                               NULL);
1778
1779       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1780
1781       if (running)
1782         {
1783           GtkStateFlags other_state;
1784           GdkRGBA *other_colors[4];
1785
1786           if (state & GTK_STATE_FLAG_PRELIGHT)
1787             {
1788               other_state = state & ~(GTK_STATE_FLAG_PRELIGHT);
1789               progress = 1 - progress;
1790             }
1791           else
1792             other_state = state | GTK_STATE_FLAG_PRELIGHT;
1793
1794           gtk_theming_engine_get (engine, other_state,
1795                                   "border-top-color", &other_colors[0],
1796                                   "border-right-color", &other_colors[1],
1797                                   "border-bottom-color", &other_colors[2],
1798                                   "border-left-color", &other_colors[3],
1799                                   NULL);
1800
1801           for (i = 0; i < 4; i++)
1802             {
1803               colors[i].red = CLAMP (alloc_colors[i]->red + ((other_colors[i]->red - alloc_colors[i]->red) * progress), 0, 1);
1804               colors[i].green = CLAMP (alloc_colors[i]->green + ((other_colors[i]->green - alloc_colors[i]->green) * progress), 0, 1);
1805               colors[i].blue = CLAMP (alloc_colors[i]->blue + ((other_colors[i]->blue - alloc_colors[i]->blue) * progress), 0, 1);
1806               colors[i].alpha = CLAMP (alloc_colors[i]->alpha + ((other_colors[i]->alpha - alloc_colors[i]->alpha) * progress), 0, 1);
1807               gdk_rgba_free (other_colors[i]);
1808               gdk_rgba_free (alloc_colors[i]);
1809             }
1810         }
1811       else
1812         {
1813           for (i = 0; i < 4; i++)
1814             {
1815               colors[i] = *alloc_colors[i];
1816               gdk_rgba_free (alloc_colors[i]);
1817             }
1818         }
1819
1820       _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1821       _gtk_rounded_box_apply_border_radius_for_engine (&border_box, engine, junction);
1822
1823       render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1824     }
1825
1826   border_style[0] = _gtk_css_border_style_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_STYLE));
1827   if (border_style[0] != GTK_BORDER_STYLE_NONE)
1828     {
1829       int offset;
1830
1831       border_style[1] = border_style[2] = border_style[3] = border_style[0];
1832       border.top = _gtk_css_value_get_int (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_WIDTH));
1833       border.left = border.right = border.bottom = border.top;
1834       colors[0] = *_gtk_css_rgba_value_get_rgba (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_COLOR));
1835       colors[3] = colors[2] = colors[1] = colors[0];
1836       offset = _gtk_css_number_value_get (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_OUTLINE_OFFSET), 100);
1837
1838       /* reinit box here - outlines don't have a border radius */
1839       _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1840       _gtk_rounded_box_shrink (&border_box,
1841                                - border.top - offset,
1842                                - border.right - offset,
1843                                - border.left - offset,
1844                                - border.bottom - offset);
1845
1846       render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1847     }
1848 }
1849
1850 static void
1851 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1852                                  cairo_t          *cr,
1853                                  gdouble           x,
1854                                  gdouble           y,
1855                                  gdouble           width,
1856                                  gdouble           height)
1857 {
1858   GtkJunctionSides junction;
1859
1860   junction = gtk_theming_engine_get_junction_sides (engine);
1861
1862   render_frame_internal (engine, cr,
1863                          x, y, width, height,
1864                          0, junction);
1865 }
1866
1867 static void
1868 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1869                                     cairo_t          *cr,
1870                                     gdouble           x,
1871                                     gdouble           y,
1872                                     gdouble           width,
1873                                     gdouble           height)
1874 {
1875   GtkStateFlags flags;
1876   GdkRGBA outline_color, fg_color;
1877   double vertical_overshoot;
1878   int diameter;
1879   double radius;
1880   double interp;                /* interpolation factor for center position */
1881   double x_double_horz, y_double_horz;
1882   double x_double_vert, y_double_vert;
1883   double x_double, y_double;
1884   gdouble angle;
1885   gint line_width;
1886   gboolean running, is_rtl;
1887   gdouble progress;
1888
1889   cairo_save (cr);
1890   flags = gtk_theming_engine_get_state (engine);
1891
1892   gtk_theming_engine_get_color (engine, flags, &fg_color);
1893   gtk_theming_engine_get_border_color (engine, flags, &outline_color);
1894
1895   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1896   is_rtl = (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL);
1897   line_width = 1;
1898
1899   if (!running)
1900     progress = (flags & GTK_STATE_FLAG_ACTIVE) ? 1 : 0;
1901
1902   if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_HORIZONTAL))
1903     {
1904       if (is_rtl)
1905         angle = (G_PI) - ((G_PI / 2) * progress);
1906       else
1907         angle = (G_PI / 2) * progress;
1908     }
1909   else
1910     {
1911       if (is_rtl)
1912         angle = (G_PI / 2) + ((G_PI / 2) * progress);
1913       else
1914         angle = (G_PI / 2) - ((G_PI / 2) * progress);
1915     }
1916
1917   interp = progress;
1918
1919   /* Compute distance that the stroke extends beyonds the end
1920    * of the triangle we draw.
1921    */
1922   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
1923
1924   /* For odd line widths, we end the vertical line of the triangle
1925    * at a half pixel, so we round differently.
1926    */
1927   if (line_width % 2 == 1)
1928     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
1929   else
1930     vertical_overshoot = ceil (vertical_overshoot);
1931
1932   /* Adjust the size of the triangle we draw so that the entire stroke fits
1933    */
1934   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
1935
1936   /* If the line width is odd, we want the diameter to be even,
1937    * and vice versa, so force the sum to be odd. This relationship
1938    * makes the point of the triangle look right.
1939    */
1940   diameter -= (1 - (diameter + line_width) % 2);
1941
1942   radius = diameter / 2.;
1943
1944   /* Adjust the center so that the stroke is properly aligned with
1945    * the pixel grid. The center adjustment is different for the
1946    * horizontal and vertical orientations. For intermediate positions
1947    * we interpolate between the two.
1948    */
1949   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1950   y_double_vert = (y + height / 2) - 0.5;
1951
1952   x_double_horz = (x + width / 2) - 0.5;
1953   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1954
1955   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
1956   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
1957
1958   cairo_translate (cr, x_double, y_double);
1959   cairo_rotate (cr, angle);
1960
1961   cairo_move_to (cr, - radius / 2., - radius);
1962   cairo_line_to (cr,   radius / 2.,   0);
1963   cairo_line_to (cr, - radius / 2.,   radius);
1964   cairo_close_path (cr);
1965
1966   cairo_set_line_width (cr, line_width);
1967
1968   gdk_cairo_set_source_rgba (cr, &fg_color);
1969
1970   cairo_fill_preserve (cr);
1971
1972   gdk_cairo_set_source_rgba (cr, &outline_color);
1973   cairo_stroke (cr);
1974
1975   cairo_restore (cr);
1976 }
1977
1978 static void
1979 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
1980                                  cairo_t          *cr,
1981                                  gdouble           x,
1982                                  gdouble           y,
1983                                  gdouble           width,
1984                                  gdouble           height)
1985 {
1986   GtkStateFlags flags;
1987   GdkRGBA color;
1988   gint line_width;
1989   gint8 *dash_list;
1990
1991   cairo_save (cr);
1992   flags = gtk_theming_engine_get_state (engine);
1993
1994   gtk_theming_engine_get_color (engine, flags, &color);
1995
1996   gtk_theming_engine_get_style (engine,
1997                                 "focus-line-width", &line_width,
1998                                 "focus-line-pattern", (gchar *) &dash_list,
1999                                 NULL);
2000
2001   cairo_set_line_width (cr, (gdouble) line_width);
2002
2003   if (dash_list[0])
2004     {
2005       gint n_dashes = strlen ((const gchar *) dash_list);
2006       gdouble *dashes = g_new (gdouble, n_dashes);
2007       gdouble total_length = 0;
2008       gdouble dash_offset;
2009       gint i;
2010
2011       for (i = 0; i < n_dashes; i++)
2012         {
2013           dashes[i] = dash_list[i];
2014           total_length += dash_list[i];
2015         }
2016
2017       /* The dash offset here aligns the pattern to integer pixels
2018        * by starting the dash at the right side of the left border
2019        * Negative dash offsets in cairo don't work
2020        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
2021        */
2022       dash_offset = - line_width / 2.;
2023
2024       while (dash_offset < 0)
2025         dash_offset += total_length;
2026
2027       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
2028       g_free (dashes);
2029     }
2030
2031   cairo_rectangle (cr,
2032                    x + line_width / 2.,
2033                    y + line_width / 2.,
2034                    width - line_width,
2035                    height - line_width);
2036
2037   gdk_cairo_set_source_rgba (cr, &color);
2038   cairo_stroke (cr);
2039
2040   cairo_restore (cr);
2041
2042   g_free (dash_list);
2043 }
2044
2045 static void
2046 gtk_theming_engine_render_line (GtkThemingEngine *engine,
2047                                 cairo_t          *cr,
2048                                 gdouble           x0,
2049                                 gdouble           y0,
2050                                 gdouble           x1,
2051                                 gdouble           y1)
2052 {
2053   GdkRGBA color;
2054   GtkStateFlags flags;
2055
2056   flags = gtk_theming_engine_get_state (engine);
2057   cairo_save (cr);
2058
2059   gtk_theming_engine_get_color (engine, flags, &color);
2060
2061   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
2062   cairo_set_line_width (cr, 1);
2063
2064   cairo_move_to (cr, x0 + 0.5, y0 + 0.5);
2065   cairo_line_to (cr, x1 + 0.5, y1 + 0.5);
2066
2067   gdk_cairo_set_source_rgba (cr, &color);
2068   cairo_stroke (cr);
2069
2070   cairo_restore (cr);
2071 }
2072
2073 static void
2074 prepare_context_for_layout (cairo_t *cr,
2075                             gdouble x,
2076                             gdouble y,
2077                             PangoLayout *layout)
2078 {
2079   const PangoMatrix *matrix;
2080
2081   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2082
2083   cairo_move_to (cr, x, y);
2084
2085   if (matrix)
2086     {
2087       cairo_matrix_t cairo_matrix;
2088
2089       cairo_matrix_init (&cairo_matrix,
2090                          matrix->xx, matrix->yx,
2091                          matrix->xy, matrix->yy,
2092                          matrix->x0, matrix->y0);
2093
2094       cairo_transform (cr, &cairo_matrix);
2095     }
2096 }
2097
2098 static void
2099 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2100                                   cairo_t          *cr,
2101                                   gdouble           x,
2102                                   gdouble           y,
2103                                   PangoLayout      *layout)
2104 {
2105   GdkRGBA fg_color;
2106   GtkStateFlags flags;
2107   gdouble progress;
2108   gboolean running;
2109
2110   cairo_save (cr);
2111   flags = gtk_theming_engine_get_state (engine);
2112   gtk_theming_engine_get_color (engine, flags, &fg_color);
2113
2114   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
2115
2116   if (running)
2117     {
2118       GtkStateFlags other_flags;
2119       GdkRGBA other_fg;
2120
2121       if (flags & GTK_STATE_FLAG_PRELIGHT)
2122         {
2123           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
2124           progress = 1 - progress;
2125         }
2126       else
2127         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
2128
2129       gtk_theming_engine_get_color (engine, other_flags, &other_fg);
2130
2131       fg_color.red = CLAMP (fg_color.red + ((other_fg.red - fg_color.red) * progress), 0, 1);
2132       fg_color.green = CLAMP (fg_color.green + ((other_fg.green - fg_color.green) * progress), 0, 1);
2133       fg_color.blue = CLAMP (fg_color.blue + ((other_fg.blue - fg_color.blue) * progress), 0, 1);
2134       fg_color.alpha = CLAMP (fg_color.alpha + ((other_fg.alpha - fg_color.alpha) * progress), 0, 1);
2135     }
2136
2137   prepare_context_for_layout (cr, x, y, layout);
2138
2139   _gtk_css_shadows_value_paint_layout (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_TEXT_SHADOW),
2140                                        cr, layout);
2141
2142   gdk_cairo_set_source_rgba (cr, &fg_color);
2143   pango_cairo_show_layout (cr, layout);
2144
2145   cairo_restore (cr);
2146 }
2147
2148 static void
2149 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2150                                   cairo_t          *cr,
2151                                   gdouble           x,
2152                                   gdouble           y,
2153                                   gdouble           width,
2154                                   gdouble           height,
2155                                   GtkOrientation    orientation)
2156 {
2157   const GtkWidgetPath *path;
2158   gint thickness;
2159
2160   path = gtk_theming_engine_get_path (engine);
2161
2162   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2163   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2164
2165   /* FIXME: thickness */
2166   thickness = 2;
2167
2168   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
2169     {
2170       if (orientation == GTK_ORIENTATION_VERTICAL)
2171         gtk_theming_engine_render_line (engine, cr,
2172                                         x + thickness,
2173                                         y + (gint) height / 2,
2174                                         x + width - thickness - 1,
2175                                         y + (gint) height / 2);
2176       else
2177         gtk_theming_engine_render_line (engine, cr,
2178                                         x + (gint) width / 2,
2179                                         y + thickness,
2180                                         x + (gint) width / 2,
2181                                         y + height - thickness - 1);
2182     }
2183 }
2184
2185 static void
2186 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2187                                      cairo_t          *cr,
2188                                      gdouble           x,
2189                                      gdouble           y,
2190                                      gdouble           width,
2191                                      gdouble           height,
2192                                      GtkPositionType   gap_side,
2193                                      gdouble           xy0_gap,
2194                                      gdouble           xy1_gap)
2195 {
2196   GtkJunctionSides junction;
2197   GtkStateFlags state;
2198   gint border_width;
2199   GtkCssValue *corner[4];
2200   gdouble x0, y0, x1, y1, xc, yc, wc, hc;
2201   GtkBorder border;
2202
2203   xc = yc = wc = hc = 0;
2204   state = gtk_theming_engine_get_state (engine);
2205   junction = gtk_theming_engine_get_junction_sides (engine);
2206
2207   gtk_theming_engine_get_border (engine, state, &border);
2208   corner[GTK_CSS_TOP_LEFT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_TOP_LEFT_RADIUS);
2209   corner[GTK_CSS_TOP_RIGHT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_TOP_RIGHT_RADIUS);
2210   corner[GTK_CSS_BOTTOM_LEFT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_BOTTOM_LEFT_RADIUS);
2211   corner[GTK_CSS_BOTTOM_RIGHT] = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_BOTTOM_RIGHT_RADIUS);
2212
2213   border_width = MIN (MIN (border.top, border.bottom),
2214                       MIN (border.left, border.right));
2215
2216   cairo_save (cr);
2217
2218   switch (gap_side)
2219     {
2220     case GTK_POS_TOP:
2221       xc = x + xy0_gap + border_width;
2222       yc = y;
2223       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2224       hc = border_width;
2225
2226       if (xy0_gap < _gtk_css_corner_value_get_x (corner[GTK_CSS_TOP_LEFT], width))
2227         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2228
2229       if (xy1_gap > width - _gtk_css_corner_value_get_x (corner[GTK_CSS_TOP_RIGHT], width))
2230         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2231       break;
2232     case GTK_POS_BOTTOM:
2233       xc = x + xy0_gap + border_width;
2234       yc = y + height - border_width;
2235       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2236       hc = border_width;
2237
2238       if (xy0_gap < _gtk_css_corner_value_get_x (corner[GTK_CSS_BOTTOM_LEFT], width))
2239         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2240
2241       if (xy1_gap > width - _gtk_css_corner_value_get_x (corner[GTK_CSS_BOTTOM_RIGHT], width))
2242         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2243
2244       break;
2245     case GTK_POS_LEFT:
2246       xc = x;
2247       yc = y + xy0_gap + border_width;
2248       wc = border_width;
2249       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2250
2251       if (xy0_gap < _gtk_css_corner_value_get_y (corner[GTK_CSS_TOP_LEFT], height))
2252         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2253
2254       if (xy1_gap > height - _gtk_css_corner_value_get_y (corner[GTK_CSS_BOTTOM_LEFT], height))
2255         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2256
2257       break;
2258     case GTK_POS_RIGHT:
2259       xc = x + width - border_width;
2260       yc = y + xy0_gap + border_width;
2261       wc = border_width;
2262       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2263
2264       if (xy0_gap < _gtk_css_corner_value_get_y (corner[GTK_CSS_TOP_RIGHT], height))
2265         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2266
2267       if (xy1_gap > height - _gtk_css_corner_value_get_y (corner[GTK_CSS_BOTTOM_RIGHT], height))
2268         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2269
2270       break;
2271     }
2272
2273   cairo_clip_extents (cr, &x0, &y0, &x1, &y1);
2274   cairo_rectangle (cr, x0, y0, x1 - x0, yc - y0);
2275   cairo_rectangle (cr, x0, yc, xc - x0, hc);
2276   cairo_rectangle (cr, xc + wc, yc, x1 - (xc + wc), hc);
2277   cairo_rectangle (cr, x0, yc + hc, x1 - x0, y1 - (yc + hc));
2278   cairo_clip (cr);
2279
2280   render_frame_internal (engine, cr,
2281                          x, y, width, height,
2282                          0, junction);
2283
2284   cairo_restore (cr);
2285 }
2286
2287 static void
2288 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2289                                      cairo_t          *cr,
2290                                      gdouble           x,
2291                                      gdouble           y,
2292                                      gdouble           width,
2293                                      gdouble           height,
2294                                      GtkPositionType   gap_side)
2295 {
2296   GtkThemingBackground bg;
2297   GtkJunctionSides junction = 0;
2298   guint hidden_side = 0;
2299
2300   cairo_save (cr);
2301
2302   switch (gap_side)
2303     {
2304     case GTK_POS_LEFT:
2305       junction = GTK_JUNCTION_LEFT;
2306       hidden_side = (1 << GTK_CSS_LEFT);
2307
2308       cairo_translate (cr, x + width, y);
2309       cairo_rotate (cr, G_PI / 2);
2310       break;
2311     case GTK_POS_RIGHT:
2312       junction = GTK_JUNCTION_RIGHT;
2313       hidden_side = (1 << GTK_CSS_RIGHT);
2314
2315       cairo_translate (cr, x, y + height);
2316       cairo_rotate (cr, - G_PI / 2);
2317       break;
2318     case GTK_POS_TOP:
2319       junction = GTK_JUNCTION_TOP;
2320       hidden_side = (1 << GTK_CSS_TOP);
2321
2322       cairo_translate (cr, x + width, y + height);
2323       cairo_rotate (cr, G_PI);
2324       break;
2325     case GTK_POS_BOTTOM:
2326       junction = GTK_JUNCTION_BOTTOM;
2327       hidden_side = (1 << GTK_CSS_BOTTOM);
2328
2329       cairo_translate (cr, x, y);
2330       break;
2331     }
2332
2333   if (gap_side == GTK_POS_TOP ||
2334       gap_side == GTK_POS_BOTTOM)
2335     _gtk_theming_background_init (&bg, engine,
2336                                   0, 0,
2337                                   width, height,
2338                                   GTK_JUNCTION_BOTTOM);
2339   else
2340     _gtk_theming_background_init (&bg, engine,
2341                                   0, 0,
2342                                   height, width,
2343                                   GTK_JUNCTION_BOTTOM);
2344
2345   _gtk_theming_background_render (&bg, cr);
2346
2347   cairo_restore (cr);
2348
2349   cairo_save (cr);
2350
2351   render_frame_internal (engine, cr,
2352                          x, y, width, height,
2353                          hidden_side, junction);
2354
2355   cairo_restore (cr);
2356 }
2357
2358 static void
2359 render_dot (cairo_t       *cr,
2360             const GdkRGBA *lighter,
2361             const GdkRGBA *darker,
2362             gdouble        x,
2363             gdouble        y,
2364             gdouble        size)
2365 {
2366   size = CLAMP ((gint) size, 2, 3);
2367
2368   if (size == 2)
2369     {
2370       gdk_cairo_set_source_rgba (cr, lighter);
2371       cairo_rectangle (cr, x, y, 1, 1);
2372       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2373       cairo_fill (cr);
2374     }
2375   else if (size == 3)
2376     {
2377       gdk_cairo_set_source_rgba (cr, lighter);
2378       cairo_rectangle (cr, x, y, 2, 1);
2379       cairo_rectangle (cr, x, y, 1, 2);
2380       cairo_fill (cr);
2381
2382       gdk_cairo_set_source_rgba (cr, darker);
2383       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2384       cairo_rectangle (cr, x + 2, y, 1, 2);
2385       cairo_fill (cr);
2386     }
2387 }
2388
2389 static void
2390 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2391                                   cairo_t          *cr,
2392                                   gdouble           x,
2393                                   gdouble           y,
2394                                   gdouble           width,
2395                                   gdouble           height)
2396 {
2397   GtkStateFlags flags;
2398   GdkRGBA bg_color, lighter, darker;
2399   GtkJunctionSides sides;
2400   GtkThemingBackground bg;
2401   gint xx, yy;
2402
2403   cairo_save (cr);
2404   flags = gtk_theming_engine_get_state (engine);
2405
2406   cairo_set_line_width (cr, 1.0);
2407   sides = gtk_theming_engine_get_junction_sides (engine);
2408   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2409
2410   color_shade (&bg_color, 0.7, &darker);
2411   color_shade (&bg_color, 1.3, &lighter);
2412
2413   _gtk_theming_background_init (&bg, engine, x, y, width, height, sides);
2414   _gtk_theming_background_render (&bg, cr);
2415
2416   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_GRIP))
2417     {
2418       /* reduce confusing values to a meaningful state */
2419       if ((sides & (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)) == (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT))
2420         sides &= ~GTK_JUNCTION_CORNER_TOPLEFT;
2421
2422       if ((sides & (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT)) == (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT))
2423         sides &= ~GTK_JUNCTION_CORNER_TOPRIGHT;
2424
2425       if (sides == 0)
2426         sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2427
2428       /* align drawing area to the connected side */
2429       if (sides == GTK_JUNCTION_LEFT)
2430         {
2431           if (height < width)
2432             width = height;
2433         }
2434       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2435         {
2436           if (width < height)
2437             height = width;
2438           else if (height < width)
2439             width = height;
2440         }
2441       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2442         {
2443           /* make it square, aligning to bottom left */
2444           if (width < height)
2445             {
2446               y += (height - width);
2447               height = width;
2448             }
2449           else if (height < width)
2450             width = height;
2451         }
2452       else if (sides == GTK_JUNCTION_RIGHT)
2453         {
2454           /* aligning to right */
2455           if (height < width)
2456             {
2457               x += (width - height);
2458               width = height;
2459             }
2460         }
2461       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2462         {
2463           if (width < height)
2464             height = width;
2465           else if (height < width)
2466             {
2467               x += (width - height);
2468               width = height;
2469             }
2470         }
2471       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2472         {
2473           /* make it square, aligning to bottom right */
2474           if (width < height)
2475             {
2476               y += (height - width);
2477               height = width;
2478             }
2479           else if (height < width)
2480             {
2481               x += (width - height);
2482               width = height;
2483             }
2484         }
2485       else if (sides == GTK_JUNCTION_TOP)
2486         {
2487           if (width < height)
2488             height = width;
2489         }
2490       else if (sides == GTK_JUNCTION_BOTTOM)
2491         {
2492           /* align to bottom */
2493           if (width < height)
2494             {
2495               y += (height - width);
2496               height = width;
2497             }
2498         }
2499       else
2500         g_assert_not_reached ();
2501
2502       if (sides == GTK_JUNCTION_LEFT ||
2503           sides == GTK_JUNCTION_RIGHT)
2504         {
2505           gint xi;
2506
2507           xi = x;
2508
2509           while (xi < x + width)
2510             {
2511               gdk_cairo_set_source_rgba (cr, &lighter);
2512               add_path_line (cr, x, y, x, y + height);
2513               cairo_stroke (cr);
2514               xi++;
2515
2516               gdk_cairo_set_source_rgba (cr, &darker);
2517               add_path_line (cr, xi, y, xi, y + height);
2518               cairo_stroke (cr);
2519               xi += 2;
2520             }
2521         }
2522       else if (sides == GTK_JUNCTION_TOP ||
2523                sides == GTK_JUNCTION_BOTTOM)
2524         {
2525           gint yi;
2526
2527           yi = y;
2528
2529           while (yi < y + height)
2530             {
2531               gdk_cairo_set_source_rgba (cr, &lighter);
2532               add_path_line (cr, x, yi, x + width, yi);
2533               cairo_stroke (cr);
2534               yi++;
2535
2536               gdk_cairo_set_source_rgba (cr, &darker);
2537               add_path_line (cr, x, yi, x + width, yi);
2538               cairo_stroke (cr);
2539               yi += 2;
2540             }
2541         }
2542       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2543         {
2544           gint xi, yi;
2545
2546           xi = x + width;
2547           yi = y + height;
2548
2549           while (xi > x + 3)
2550             {
2551               gdk_cairo_set_source_rgba (cr, &darker);
2552               add_path_line (cr, xi, y, x, yi);
2553               cairo_stroke (cr);
2554
2555               --xi;
2556               --yi;
2557
2558               add_path_line (cr, xi, y, x, yi);
2559               cairo_stroke (cr);
2560
2561               --xi;
2562               --yi;
2563
2564               gdk_cairo_set_source_rgba (cr, &lighter);
2565               add_path_line (cr, xi, y, x, yi);
2566               cairo_stroke (cr);
2567
2568               xi -= 3;
2569               yi -= 3;
2570             }
2571         }
2572       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2573         {
2574           gint xi, yi;
2575
2576           xi = x;
2577           yi = y + height;
2578
2579           while (xi < (x + width - 3))
2580             {
2581               gdk_cairo_set_source_rgba (cr, &lighter);
2582               add_path_line (cr, xi, y, x + width, yi);
2583               cairo_stroke (cr);
2584
2585               ++xi;
2586               --yi;
2587
2588               gdk_cairo_set_source_rgba (cr, &darker);
2589               add_path_line (cr, xi, y, x + width, yi);
2590               cairo_stroke (cr);
2591
2592               ++xi;
2593               --yi;
2594
2595               add_path_line (cr, xi, y, x + width, yi);
2596               cairo_stroke (cr);
2597
2598               xi += 3;
2599               yi -= 3;
2600             }
2601         }
2602       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2603         {
2604           gint xi, yi;
2605
2606           xi = x + width;
2607           yi = y;
2608
2609           while (xi > x + 3)
2610             {
2611               gdk_cairo_set_source_rgba (cr, &darker);
2612               add_path_line (cr, x, yi, xi, y + height);
2613               cairo_stroke (cr);
2614
2615               --xi;
2616               ++yi;
2617
2618               add_path_line (cr, x, yi, xi, y + height);
2619               cairo_stroke (cr);
2620
2621               --xi;
2622               ++yi;
2623
2624               gdk_cairo_set_source_rgba (cr, &lighter);
2625               add_path_line (cr, x, yi, xi, y + height);
2626               cairo_stroke (cr);
2627
2628               xi -= 3;
2629               yi += 3;
2630             }
2631         }
2632       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2633         {
2634           gint xi, yi;
2635
2636           xi = x;
2637           yi = y;
2638
2639           while (xi < (x + width - 3))
2640             {
2641               gdk_cairo_set_source_rgba (cr, &lighter);
2642               add_path_line (cr, xi, y + height, x + width, yi);
2643               cairo_stroke (cr);
2644
2645               ++xi;
2646               ++yi;
2647
2648               gdk_cairo_set_source_rgba (cr, &darker);
2649               add_path_line (cr, xi, y + height, x + width, yi);
2650               cairo_stroke (cr);
2651
2652               ++xi;
2653               ++yi;
2654
2655               add_path_line (cr, xi, y + height, x + width, yi);
2656               cairo_stroke (cr);
2657
2658               xi += 3;
2659               yi += 3;
2660             }
2661         }
2662     }
2663   else if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_PANE_SEPARATOR))
2664     {
2665       if (width > height)
2666         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2667           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2668       else
2669         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2670           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2671     }
2672   else
2673     {
2674       for (yy = y; yy < y + height; yy += 3)
2675         for (xx = x; xx < x + width; xx += 6)
2676           {
2677             render_dot (cr, &lighter, &darker, xx, yy, 2);
2678             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2679           }
2680     }
2681
2682   cairo_restore (cr);
2683 }
2684
2685 void
2686 _gtk_theming_engine_paint_spinner (cairo_t       *cr,
2687                                    gdouble        radius,
2688                                    gdouble        progress,
2689                                    const GdkRGBA *color)
2690 {
2691   guint num_steps, step;
2692   gdouble half;
2693   gint i;
2694
2695   num_steps = 12;
2696
2697   if (progress >= 0)
2698     step = (guint) (progress * num_steps);
2699   else
2700     step = 0;
2701
2702   cairo_save (cr);
2703
2704   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2705   cairo_set_line_width (cr, 2.0);
2706
2707   half = num_steps / 2;
2708
2709   for (i = 0; i < num_steps; i++)
2710     {
2711       gint inset = 0.7 * radius;
2712
2713       /* transparency is a function of time and intial value */
2714       gdouble t = 1.0 - (gdouble) ((i + step) % num_steps) / num_steps;
2715       gdouble xscale = - sin (i * G_PI / half);
2716       gdouble yscale = - cos (i * G_PI / half);
2717
2718       cairo_set_source_rgba (cr,
2719                              color->red,
2720                              color->green,
2721                              color->blue,
2722                              color->alpha * t);
2723
2724       cairo_move_to (cr,
2725                      (radius - inset) * xscale,
2726                      (radius - inset) * yscale);
2727       cairo_line_to (cr,
2728                      radius * xscale,
2729                      radius * yscale);
2730
2731       cairo_stroke (cr);
2732     }
2733
2734   cairo_restore (cr);
2735 }
2736
2737 static void
2738 render_spinner (GtkThemingEngine *engine,
2739                 cairo_t          *cr,
2740                 gdouble           x,
2741                 gdouble           y,
2742                 gdouble           width,
2743                 gdouble           height)
2744 {
2745   GtkStateFlags state;
2746   GdkRGBA color;
2747   gdouble progress;
2748   gdouble radius;
2749
2750   state = gtk_theming_engine_get_state (engine);
2751
2752   if (!gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
2753     progress = -1;
2754
2755   radius = MIN (width / 2, height / 2);
2756
2757   gtk_theming_engine_get_color (engine, state, &color);
2758
2759   cairo_save (cr);
2760   cairo_translate (cr, x + width / 2, y + height / 2);
2761
2762   _gtk_css_shadows_value_paint_spinner (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_ICON_SHADOW),
2763                                         cr,
2764                                         radius,
2765                                         progress);
2766
2767   _gtk_theming_engine_paint_spinner (cr,
2768                                      radius,
2769                                      progress,
2770                                      &color);
2771
2772   cairo_restore (cr);
2773 }
2774
2775 static void
2776 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2777                                     cairo_t          *cr,
2778                                     gdouble           x,
2779                                     gdouble           y,
2780                                     gdouble           width,
2781                                     gdouble           height)
2782 {
2783   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
2784     {
2785       render_spinner (engine, cr, x, y, width, height);
2786     }
2787   else
2788     {
2789       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2790       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2791     }
2792 }
2793
2794 static GdkPixbuf *
2795 scale_or_ref (GdkPixbuf *src,
2796               gint       width,
2797               gint       height)
2798 {
2799   if (width == gdk_pixbuf_get_width (src) &&
2800       height == gdk_pixbuf_get_height (src))
2801     return g_object_ref (src);
2802   else
2803     return gdk_pixbuf_scale_simple (src,
2804                                     width, height,
2805                                     GDK_INTERP_BILINEAR);
2806 }
2807
2808 static gboolean
2809 lookup_icon_size (GtkThemingEngine *engine,
2810                   GtkIconSize       size,
2811                   gint             *width,
2812                   gint             *height)
2813 {
2814   GdkScreen *screen;
2815   GtkSettings *settings;
2816
2817   screen = gtk_theming_engine_get_screen (engine);
2818   settings = gtk_settings_get_for_screen (screen);
2819
2820   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
2821 }
2822
2823 static void
2824 colorshift_source (cairo_t *cr,
2825                    gdouble shift)
2826 {
2827   cairo_pattern_t *source;
2828
2829   cairo_save (cr);
2830   cairo_paint (cr);
2831
2832   source = cairo_pattern_reference (cairo_get_source (cr));
2833
2834   cairo_set_source_rgb (cr, shift, shift, shift);
2835   cairo_set_operator (cr, CAIRO_OPERATOR_COLOR_DODGE);
2836
2837   cairo_mask (cr, source);
2838
2839   cairo_pattern_destroy (source);
2840   cairo_restore (cr);
2841 }
2842
2843 static GdkPixbuf *
2844 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
2845                                        const GtkIconSource *source,
2846                                        GtkIconSize          size)
2847 {
2848   GdkPixbuf *scaled;
2849   GdkPixbuf *stated;
2850   GdkPixbuf *base_pixbuf;
2851   GtkStateFlags state;
2852   gint width = 1;
2853   gint height = 1;
2854   cairo_t *cr;
2855   cairo_surface_t *surface;
2856
2857   base_pixbuf = gtk_icon_source_get_pixbuf (source);
2858   state = gtk_theming_engine_get_state (engine);
2859
2860   g_return_val_if_fail (base_pixbuf != NULL, NULL);
2861
2862   if (size != (GtkIconSize) -1 &&
2863       !lookup_icon_size (engine, size, &width, &height))
2864     {
2865       g_warning (G_STRLOC ": invalid icon size '%d'", size);
2866       return NULL;
2867     }
2868
2869   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
2870    * leave it alone.
2871    */
2872   if (size != (GtkIconSize) -1 &&
2873       gtk_icon_source_get_size_wildcarded (source))
2874     scaled = scale_or_ref (base_pixbuf, width, height);
2875   else
2876     scaled = g_object_ref (base_pixbuf);
2877
2878   /* If the state was wildcarded, then generate a state. */
2879   if (gtk_icon_source_get_state_wildcarded (source))
2880     {
2881       if (state & GTK_STATE_FLAG_INSENSITIVE)
2882         {
2883           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2884                                                 gdk_pixbuf_get_width (scaled),
2885                                                 gdk_pixbuf_get_height (scaled));
2886           cr = cairo_create (surface);
2887           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2888           cairo_paint_with_alpha (cr, 0.5);
2889
2890           cairo_destroy (cr);
2891
2892           g_object_unref (scaled);
2893           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2894                                                 cairo_image_surface_get_width (surface),
2895                                                 cairo_image_surface_get_height (surface));
2896           cairo_surface_destroy (surface);
2897         }
2898       else if (state & GTK_STATE_FLAG_PRELIGHT)
2899         {
2900           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2901                                                 gdk_pixbuf_get_width (scaled),
2902                                                 gdk_pixbuf_get_height (scaled));
2903
2904           cr = cairo_create (surface);
2905           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2906           colorshift_source (cr, 0.10);
2907
2908           cairo_destroy (cr);
2909
2910           g_object_unref (scaled);
2911           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2912                                                 cairo_image_surface_get_width (surface),
2913                                                 cairo_image_surface_get_height (surface));
2914           cairo_surface_destroy (surface);
2915         }
2916       else
2917         stated = scaled;
2918     }
2919   else
2920     stated = scaled;
2921
2922   return stated;
2923 }
2924
2925 static void
2926 gtk_theming_engine_render_icon (GtkThemingEngine *engine,
2927                                 cairo_t *cr,
2928                                 GdkPixbuf *pixbuf,
2929                                 gdouble x,
2930                                 gdouble y)
2931 {
2932   cairo_save (cr);
2933
2934   gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
2935
2936   _gtk_css_shadows_value_paint_icon (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_ICON_SHADOW), cr);
2937
2938   cairo_paint (cr);
2939
2940   cairo_restore (cr);
2941 }
2942