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, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <math.h>
  23 #include <gtk/gtk.h>
  24
  25 #include <gtk/gtkthemingengine.h>
  26 #include <gtk/gtkstylecontext.h>
  27 #include <gtk/gtkintl.h>
  28
  29 #include "gtkprivate.h"
  30 #include "gtkmodulesprivate.h"
  31 #include "gtkborderimageprivate.h"
  32 #include "gtkpango.h"
  33 #include "gtkshadowprivate.h"
  34 #include "gtkcsstypesprivate.h"
  35 #include "gtkthemingengineprivate.h"
  36 #include "gtkroundedboxprivate.h"
  37 #include "gtkthemingbackgroundprivate.h"
  38
  39 /**
  40  * SECTION:gtkthemingengine
  41  * @Short_description: Theming renderers
  42  * @Title: GtkThemingEngine
  43  * @See_also: #GtkStyleContext
  44  *
  45  * #GtkThemingEngine is the object used for rendering themed content
  46  * in GTK+ widgets. Even though GTK+ has a default implementation,
  47  * it can be overridden in CSS files by enforcing a #GtkThemingEngine
  48  * object to be loaded as a module.
  49  *
  50  * In order to implement a theming engine, a #GtkThemingEngine subclass
  51  * must be created, alongside the CSS file that will reference it, the
  52  * theming engine would be created as an .so library, and installed in
  53  * $(gtk-modules-dir)/theming-engines/.
  54  *
  55  * #GtkThemingEngine<!-- -->s have limited access to the object they are
  56  * rendering, the #GtkThemingEngine API has read-only accessors to the
  57  * style information contained in the rendered object's #GtkStyleContext.
  58  */
  59
  60 enum {
  61   SIDE_LEFT   = 1,
  62   SIDE_BOTTOM = 1 << 1,
  63   SIDE_RIGHT  = 1 << 2,
  64   SIDE_TOP    = 1 << 3,
  65   SIDE_ALL    = 0xF
  66 };
  67
  68 enum {
  69   PROP_0,
  70   PROP_NAME
  71 };
  72
  73 struct GtkThemingEnginePrivate
  74 {
  75   GtkStyleContext *context;
  76   gchar *name;
  77 };
  78
  79 #define GTK_THEMING_ENGINE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_THEMING_ENGINE, GtkThemingEnginePrivate))
  80
  81 static void gtk_theming_engine_finalize          (GObject      *object);
  82 static void gtk_theming_engine_impl_set_property (GObject      *object,
  83                                                   guint         prop_id,
  84                                                   const GValue *value,
  85                                                   GParamSpec   *pspec);
  86 static void gtk_theming_engine_impl_get_property (GObject      *object,
  87                                                   guint         prop_id,
  88                                                   GValue       *value,
  89                                                   GParamSpec   *pspec);
  90
  91 static void gtk_theming_engine_render_check (GtkThemingEngine *engine,
  92                                              cairo_t          *cr,
  93                                              gdouble           x,
  94                                              gdouble           y,
  95                                              gdouble           width,
  96                                              gdouble           height);
  97 static void gtk_theming_engine_render_option (GtkThemingEngine *engine,
  98                                               cairo_t          *cr,
  99                                               gdouble           x,
 100                                               gdouble           y,
 101                                               gdouble           width,
 102                                               gdouble           height);
 103 static void gtk_theming_engine_render_arrow  (GtkThemingEngine *engine,
 104                                               cairo_t          *cr,
 105                                               gdouble           angle,
 106                                               gdouble           x,
 107                                               gdouble           y,
 108                                               gdouble           size);
 109 static void gtk_theming_engine_render_background (GtkThemingEngine *engine,
 110                                                   cairo_t          *cr,
 111                                                   gdouble           x,
 112                                                   gdouble           y,
 113                                                   gdouble           width,
 114                                                   gdouble           height);
 115 static void gtk_theming_engine_render_frame  (GtkThemingEngine *engine,
 116                                               cairo_t          *cr,
 117                                               gdouble           x,
 118                                               gdouble           y,
 119                                               gdouble           width,
 120                                               gdouble           height);
 121 static void gtk_theming_engine_render_expander (GtkThemingEngine *engine,
 122                                                 cairo_t          *cr,
 123                                                 gdouble           x,
 124                                                 gdouble           y,
 125                                                 gdouble           width,
 126                                                 gdouble           height);
 127 static void gtk_theming_engine_render_focus    (GtkThemingEngine *engine,
 128                                                 cairo_t          *cr,
 129                                                 gdouble           x,
 130                                                 gdouble           y,
 131                                                 gdouble           width,
 132                                                 gdouble           height);
 133 static void gtk_theming_engine_render_layout   (GtkThemingEngine *engine,
 134                                                 cairo_t          *cr,
 135                                                 gdouble           x,
 136                                                 gdouble           y,
 137                                                 PangoLayout      *layout);
 138 static void gtk_theming_engine_render_line     (GtkThemingEngine *engine,
 139                                                 cairo_t          *cr,
 140                                                 gdouble           x0,
 141                                                 gdouble           y0,
 142                                                 gdouble           x1,
 143                                                 gdouble           y1);
 144 static void gtk_theming_engine_render_slider   (GtkThemingEngine *engine,
 145                                                 cairo_t          *cr,
 146                                                 gdouble           x,
 147                                                 gdouble           y,
 148                                                 gdouble           width,
 149                                                 gdouble           height,
 150                                                 GtkOrientation    orientation);
 151 static void gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
 152                                                  cairo_t          *cr,
 153                                                  gdouble           x,
 154                                                  gdouble           y,
 155                                                  gdouble           width,
 156                                                  gdouble           height,
 157                                                  GtkPositionType   gap_side,
 158                                                  gdouble           xy0_gap,
 159                                                  gdouble           xy1_gap);
 160 static void gtk_theming_engine_render_extension (GtkThemingEngine *engine,
 161                                                  cairo_t          *cr,
 162                                                  gdouble           x,
 163                                                  gdouble           y,
 164                                                  gdouble           width,
 165                                                  gdouble           height,
 166                                                  GtkPositionType   gap_side);
 167 static void gtk_theming_engine_render_handle    (GtkThemingEngine *engine,
 168                                                  cairo_t          *cr,
 169                                                  gdouble           x,
 170                                                  gdouble           y,
 171                                                  gdouble           width,
 172                                                  gdouble           height);
 173 static void gtk_theming_engine_render_activity  (GtkThemingEngine *engine,
 174                                                  cairo_t          *cr,
 175                                                  gdouble           x,
 176                                                  gdouble           y,
 177                                                  gdouble           width,
 178                                                  gdouble           height);
 179 static GdkPixbuf * gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
 180                                                           const GtkIconSource *source,
 181                                                           GtkIconSize          size);
 182 static void gtk_theming_engine_render_icon (GtkThemingEngine *engine,
 183                                             cairo_t *cr,
 184                                             GdkPixbuf *pixbuf,
 185                                             gdouble x,
 186                                             gdouble y);
 187
 188 G_DEFINE_TYPE (GtkThemingEngine, gtk_theming_engine, G_TYPE_OBJECT)
 189
 190
 191 typedef struct GtkThemingModule GtkThemingModule;
 192 typedef struct GtkThemingModuleClass GtkThemingModuleClass;
 193
 194 struct GtkThemingModule
 195 {
 196   GTypeModule parent_instance;
 197   GModule *module;
 198   gchar *name;
 199
 200   void (*init) (GTypeModule *module);
 201   void (*exit) (void);
 202   GtkThemingEngine * (*create_engine) (void);
 203 };
 204
 205 struct GtkThemingModuleClass
 206 {
 207   GTypeModuleClass parent_class;
 208 };
 209
 210 #define GTK_TYPE_THEMING_MODULE  (gtk_theming_module_get_type ())
 211 #define GTK_THEMING_MODULE(o)    (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_THEMING_MODULE, GtkThemingModule))
 212 #define GTK_IS_THEMING_MODULE(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_THEMING_MODULE))
 213
 214 G_DEFINE_TYPE (GtkThemingModule, gtk_theming_module, G_TYPE_TYPE_MODULE);
 215
 216 static void
 217 gtk_theming_engine_class_init (GtkThemingEngineClass *klass)
 218 {
 219   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 220
 221   object_class->finalize = gtk_theming_engine_finalize;
 222   object_class->set_property = gtk_theming_engine_impl_set_property;
 223   object_class->get_property = gtk_theming_engine_impl_get_property;
 224
 225   klass->render_icon = gtk_theming_engine_render_icon;
 226   klass->render_check = gtk_theming_engine_render_check;
 227   klass->render_option = gtk_theming_engine_render_option;
 228   klass->render_arrow = gtk_theming_engine_render_arrow;
 229   klass->render_background = gtk_theming_engine_render_background;
 230   klass->render_frame = gtk_theming_engine_render_frame;
 231   klass->render_expander = gtk_theming_engine_render_expander;
 232   klass->render_focus = gtk_theming_engine_render_focus;
 233   klass->render_layout = gtk_theming_engine_render_layout;
 234   klass->render_line = gtk_theming_engine_render_line;
 235   klass->render_slider = gtk_theming_engine_render_slider;
 236   klass->render_frame_gap = gtk_theming_engine_render_frame_gap;
 237   klass->render_extension = gtk_theming_engine_render_extension;
 238   klass->render_handle = gtk_theming_engine_render_handle;
 239   klass->render_activity = gtk_theming_engine_render_activity;
 240   klass->render_icon_pixbuf = gtk_theming_engine_render_icon_pixbuf;
 241
 242   /**
 243    * GtkThemingEngine:name:
 244    *
 245    * The theming engine name, this name will be used when registering
 246    * custom properties, for a theming engine named "Clearlooks" registering
 247    * a "glossy" custom property, it could be referenced in the CSS file as
 248    *
 249    * <programlisting>
 250    * -Clearlooks-glossy: true;
 251    * </programlisting>
 252    *
 253    * Since: 3.0
 254    */
 255   g_object_class_install_property (object_class,
 256                                    PROP_NAME,
 257                                    g_param_spec_string ("name",
 258                                                         P_("Name"),
 259                                                         P_("Theming engine name"),
 260                                                         NULL,
 261                                                         G_PARAM_CONSTRUCT_ONLY | GTK_PARAM_READWRITE));
 262
 263   g_type_class_add_private (object_class, sizeof (GtkThemingEnginePrivate));
 264 }
 265
 266 static void
 267 gtk_theming_engine_init (GtkThemingEngine *engine)
 268 {
 269   engine->priv = GTK_THEMING_ENGINE_GET_PRIVATE (engine);
 270 }
 271
 272 static void
 273 gtk_theming_engine_finalize (GObject *object)
 274 {
 275   GtkThemingEnginePrivate *priv;
 276
 277   priv = GTK_THEMING_ENGINE (object)->priv;
 278   g_free (priv->name);
 279
 280   G_OBJECT_GET_CLASS (gtk_theming_engine_parent_class)->finalize (object);
 281 }
 282
 283 static void
 284 gtk_theming_engine_impl_set_property (GObject      *object,
 285                                       guint         prop_id,
 286                                       const GValue *value,
 287                                       GParamSpec   *pspec)
 288 {
 289   GtkThemingEnginePrivate *priv;
 290
 291   priv = GTK_THEMING_ENGINE (object)->priv;
 292
 293   switch (prop_id)
 294     {
 295     case PROP_NAME:
 296       if (priv->name)
 297         g_free (priv->name);
 298
 299       priv->name = g_value_dup_string (value);
 300       break;
 301     default:
 302       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 303       break;
 304     }
 305 }
 306
 307 static void
 308 gtk_theming_engine_impl_get_property (GObject    *object,
 309                                       guint       prop_id,
 310                                       GValue     *value,
 311                                       GParamSpec *pspec)
 312 {
 313   GtkThemingEnginePrivate *priv;
 314
 315   priv = GTK_THEMING_ENGINE (object)->priv;
 316
 317   switch (prop_id)
 318     {
 319     case PROP_NAME:
 320       g_value_set_string (value, priv->name);
 321       break;
 322     default:
 323       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 324       break;
 325     }
 326 }
 327
 328 void
 329 _gtk_theming_engine_set_context (GtkThemingEngine *engine,
 330                                  GtkStyleContext  *context)
 331 {
 332   GtkThemingEnginePrivate *priv;
 333
 334   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 335   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
 336
 337   priv = engine->priv;
 338   priv->context = context;
 339 }
 340
 341 const GValue *
 342 _gtk_theming_engine_peek_property (GtkThemingEngine *engine,
 343                                    const char       *property_name)
 344 {
 345   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 346   g_return_val_if_fail (property_name != NULL, NULL);
 347
 348   return _gtk_style_context_peek_property (engine->priv->context, property_name);
 349 }
 350
 351 /**
 352  * gtk_theming_engine_get_property:
 353  * @engine: a #GtkThemingEngine
 354  * @property: the property name
 355  * @state: state to retrieve the value for
 356  * @value: (out) (transfer full): return location for the property value,
 357  *         you must free this memory using g_value_unset() once you are
 358  *         done with it.
 359  *
 360  * Gets a property value as retrieved from the style settings that apply
 361  * to the currently rendered element.
 362  *
 363  * Since: 3.0
 364  **/
 365 void
 366 gtk_theming_engine_get_property (GtkThemingEngine *engine,
 367                                  const gchar      *property,
 368                                  GtkStateFlags     state,
 369                                  GValue           *value)
 370 {
 371   GtkThemingEnginePrivate *priv;
 372
 373   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 374   g_return_if_fail (property != NULL);
 375   g_return_if_fail (value != NULL);
 376
 377   priv = engine->priv;
 378   gtk_style_context_get_property (priv->context, property, state, value);
 379 }
 380
 381 /**
 382  * gtk_theming_engine_get_valist:
 383  * @engine: a #GtkThemingEngine
 384  * @state: state to retrieve values for
 385  * @args: va_list of property name/return location pairs, followed by %NULL
 386  *
 387  * Retrieves several style property values that apply to the currently
 388  * rendered element.
 389  *
 390  * Since: 3.0
 391  **/
 392 void
 393 gtk_theming_engine_get_valist (GtkThemingEngine *engine,
 394                                GtkStateFlags     state,
 395                                va_list           args)
 396 {
 397   GtkThemingEnginePrivate *priv;
 398
 399   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 400
 401   priv = engine->priv;
 402   gtk_style_context_get_valist (priv->context, state, args);
 403 }
 404
 405 /**
 406  * gtk_theming_engine_get:
 407  * @engine: a #GtkThemingEngine
 408  * @state: state to retrieve values for
 409  * @...: property name /return value pairs, followed by %NULL
 410  *
 411  * Retrieves several style property values that apply to the currently
 412  * rendered element.
 413  *
 414  * Since: 3.0
 415  **/
 416 void
 417 gtk_theming_engine_get (GtkThemingEngine *engine,
 418                         GtkStateFlags     state,
 419                         ...)
 420 {
 421   GtkThemingEnginePrivate *priv;
 422   va_list args;
 423
 424   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 425
 426   priv = engine->priv;
 427
 428   va_start (args, state);
 429   gtk_style_context_get_valist (priv->context, state, args);
 430   va_end (args);
 431 }
 432
 433 /**
 434  * gtk_theming_engine_get_style_property:
 435  * @engine: a #GtkThemingEngine
 436  * @property_name: the name of the widget style property
 437  * @value: Return location for the property value, free with
 438  *         g_value_unset() after use.
 439  *
 440  * Gets the value for a widget style property.
 441  *
 442  * Since: 3.0
 443  **/
 444 void
 445 gtk_theming_engine_get_style_property (GtkThemingEngine *engine,
 446                                        const gchar      *property_name,
 447                                        GValue           *value)
 448 {
 449   GtkThemingEnginePrivate *priv;
 450
 451   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 452   g_return_if_fail (property_name != NULL);
 453
 454   priv = engine->priv;
 455   gtk_style_context_get_style_property (priv->context, property_name, value);
 456 }
 457
 458 /**
 459  * gtk_theming_engine_get_style_valist:
 460  * @engine: a #GtkThemingEngine
 461  * @args: va_list of property name/return location pairs, followed by %NULL
 462  *
 463  * Retrieves several widget style properties from @engine according to the
 464  * currently rendered content's style.
 465  *
 466  * Since: 3.0
 467  **/
 468 void
 469 gtk_theming_engine_get_style_valist (GtkThemingEngine *engine,
 470                                      va_list           args)
 471 {
 472   GtkThemingEnginePrivate *priv;
 473
 474   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 475
 476   priv = engine->priv;
 477   gtk_style_context_get_style_valist (priv->context, args);
 478 }
 479
 480 /**
 481  * gtk_theming_engine_get_style:
 482  * @engine: a #GtkThemingEngine
 483  * @...: property name /return value pairs, followed by %NULL
 484  *
 485  * Retrieves several widget style properties from @engine according
 486  * to the currently rendered content's style.
 487  *
 488  * Since: 3.0
 489  **/
 490 void
 491 gtk_theming_engine_get_style (GtkThemingEngine *engine,
 492                               ...)
 493 {
 494   GtkThemingEnginePrivate *priv;
 495   va_list args;
 496
 497   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 498
 499   priv = engine->priv;
 500
 501   va_start (args, engine);
 502   gtk_style_context_get_style_valist (priv->context, args);
 503   va_end (args);
 504 }
 505
 506 /**
 507  * gtk_theming_engine_lookup_color:
 508  * @engine: a #GtkThemingEngine
 509  * @color_name: color name to lookup
 510  * @color: (out): Return location for the looked up color
 511  *
 512  * Looks up and resolves a color name in the current style's color map.
 513  *
 514  * Returns: %TRUE if @color_name was found and resolved, %FALSE otherwise
 515  **/
 516 gboolean
 517 gtk_theming_engine_lookup_color (GtkThemingEngine *engine,
 518                                  const gchar      *color_name,
 519                                  GdkRGBA          *color)
 520 {
 521   GtkThemingEnginePrivate *priv;
 522
 523   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 524   g_return_val_if_fail (color_name != NULL, FALSE);
 525
 526   priv = engine->priv;
 527   return gtk_style_context_lookup_color (priv->context, color_name, color);
 528 }
 529
 530 /**
 531  * gtk_theming_engine_get_state:
 532  * @engine: a #GtkThemingEngine
 533  *
 534  * returns the state used when rendering.
 535  *
 536  * Returns: the state flags
 537  *
 538  * Since: 3.0
 539  **/
 540 GtkStateFlags
 541 gtk_theming_engine_get_state (GtkThemingEngine *engine)
 542 {
 543   GtkThemingEnginePrivate *priv;
 544
 545   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 546
 547   priv = engine->priv;
 548   return gtk_style_context_get_state (priv->context);
 549 }
 550
 551 /**
 552  * gtk_theming_engine_state_is_running:
 553  * @engine: a #GtkThemingEngine
 554  * @state: a widget state
 555  * @progress: (out): return location for the transition progress
 556  *
 557  * Returns %TRUE if there is a transition animation running for the
 558  * current region (see gtk_style_context_push_animatable_region()).
 559  *
 560  * If @progress is not %NULL, the animation progress will be returned
 561  * there, 0.0 means the state is closest to being %FALSE, while 1.0 means
 562  * it's closest to being %TRUE. This means transition animations will
 563  * run from 0 to 1 when @state is being set to %TRUE and from 1 to 0 when
 564  * it's being set to %FALSE.
 565  *
 566  * Returns: %TRUE if there is a running transition animation for @state.
 567  *
 568  * Since: 3.0
 569  **/
 570 gboolean
 571 gtk_theming_engine_state_is_running (GtkThemingEngine *engine,
 572                                      GtkStateType      state,
 573                                      gdouble          *progress)
 574 {
 575   GtkThemingEnginePrivate *priv;
 576
 577   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 578
 579   priv = engine->priv;
 580   return gtk_style_context_state_is_running (priv->context, state, progress);
 581 }
 582
 583 /**
 584  * gtk_theming_engine_get_path:
 585  * @engine: a #GtkThemingEngine
 586  *
 587  * Returns the widget path used for style matching.
 588  *
 589  * Returns: (transfer none): A #GtkWidgetPath
 590  *
 591  * Since: 3.0
 592  **/
 593 const GtkWidgetPath *
 594 gtk_theming_engine_get_path (GtkThemingEngine *engine)
 595 {
 596   GtkThemingEnginePrivate *priv;
 597
 598   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 599
 600   priv = engine->priv;
 601   return gtk_style_context_get_path (priv->context);
 602 }
 603
 604 /**
 605  * gtk_theming_engine_has_class:
 606  * @engine: a #GtkThemingEngine
 607  * @style_class: class name to look up
 608  *
 609  * Returns %TRUE if the currently rendered contents have
 610  * defined the given class name.
 611  *
 612  * Returns: %TRUE if @engine has @class_name defined
 613  *
 614  * Since: 3.0
 615  **/
 616 gboolean
 617 gtk_theming_engine_has_class (GtkThemingEngine *engine,
 618                               const gchar      *style_class)
 619 {
 620   GtkThemingEnginePrivate *priv;
 621
 622   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 623
 624   priv = engine->priv;
 625   return gtk_style_context_has_class (priv->context, style_class);
 626 }
 627
 628 /**
 629  * gtk_theming_engine_has_region:
 630  * @engine: a #GtkThemingEngine
 631  * @style_region: a region name
 632  * @flags: (out) (allow-none): return location for region flags
 633  *
 634  * Returns %TRUE if the currently rendered contents have the
 635  * region defined. If @flags_return is not %NULL, it is set
 636  * to the flags affecting the region.
 637  *
 638  * Returns: %TRUE if region is defined
 639  *
 640  * Since: 3.0
 641  **/
 642 gboolean
 643 gtk_theming_engine_has_region (GtkThemingEngine *engine,
 644                                const gchar      *style_region,
 645                                GtkRegionFlags   *flags)
 646 {
 647   GtkThemingEnginePrivate *priv;
 648
 649   if (flags)
 650     *flags = 0;
 651
 652   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 653
 654   priv = engine->priv;
 655   return gtk_style_context_has_region (priv->context, style_region, flags);
 656 }
 657
 658 /**
 659  * gtk_theming_engine_get_direction:
 660  * @engine: a #GtkThemingEngine
 661  *
 662  * Returns the widget direction used for rendering.
 663  *
 664  * Returns: the widget direction
 665  *
 666  * Since: 3.0
 667  **/
 668 GtkTextDirection
 669 gtk_theming_engine_get_direction (GtkThemingEngine *engine)
 670 {
 671   GtkThemingEnginePrivate *priv;
 672
 673   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), GTK_TEXT_DIR_LTR);
 674
 675   priv = engine->priv;
 676   return gtk_style_context_get_direction (priv->context);
 677 }
 678
 679 /**
 680  * gtk_theming_engine_get_junction_sides:
 681  * @engine: a #GtkThemingEngine
 682  *
 683  * Returns the widget direction used for rendering.
 684  *
 685  * Returns: the widget direction
 686  *
 687  * Since: 3.0
 688  **/
 689 GtkJunctionSides
 690 gtk_theming_engine_get_junction_sides (GtkThemingEngine *engine)
 691 {
 692   GtkThemingEnginePrivate *priv;
 693
 694   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 695
 696   priv = engine->priv;
 697   return gtk_style_context_get_junction_sides (priv->context);
 698 }
 699
 700 /**
 701  * gtk_theming_engine_get_color:
 702  * @engine: a #GtkThemingEngine
 703  * @state: state to retrieve the color for
 704  * @color: (out): return value for the foreground color
 705  *
 706  * Gets the foreground color for a given state.
 707  *
 708  * Since: 3.0
 709  **/
 710 void
 711 gtk_theming_engine_get_color (GtkThemingEngine *engine,
 712                               GtkStateFlags     state,
 713                               GdkRGBA          *color)
 714 {
 715   GtkThemingEnginePrivate *priv;
 716
 717   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 718
 719   priv = engine->priv;
 720   gtk_style_context_get_color (priv->context, state, color);
 721 }
 722
 723 /**
 724  * gtk_theming_engine_get_background_color:
 725  * @engine: a #GtkThemingEngine
 726  * @state: state to retrieve the color for
 727  * @color: (out): return value for the background color
 728  *
 729  * Gets the background color for a given state.
 730  *
 731  * Since: 3.0
 732  **/
 733 void
 734 gtk_theming_engine_get_background_color (GtkThemingEngine *engine,
 735                                          GtkStateFlags     state,
 736                                          GdkRGBA          *color)
 737 {
 738   GtkThemingEnginePrivate *priv;
 739
 740   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 741
 742   priv = engine->priv;
 743   gtk_style_context_get_background_color (priv->context, state, color);
 744 }
 745
 746 /**
 747  * gtk_theming_engine_get_border_color:
 748  * @engine: a #GtkThemingEngine
 749  * @state: state to retrieve the color for
 750  * @color: (out): return value for the border color
 751  *
 752  * Gets the border color for a given state.
 753  *
 754  * Since: 3.0
 755  **/
 756 void
 757 gtk_theming_engine_get_border_color (GtkThemingEngine *engine,
 758                                      GtkStateFlags     state,
 759                                      GdkRGBA          *color)
 760 {
 761   GtkThemingEnginePrivate *priv;
 762
 763   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 764
 765   priv = engine->priv;
 766   gtk_style_context_get_border_color (priv->context, state, color);
 767 }
 768
 769 /**
 770  * gtk_theming_engine_get_border:
 771  * @engine: a #GtkthemingEngine
 772  * @state: state to retrieve the border for
 773  * @border: (out): return value for the border settings
 774  *
 775  * Gets the border for a given state as a #GtkBorder.
 776  *
 777  * Since: 3.0
 778  **/
 779 void
 780 gtk_theming_engine_get_border (GtkThemingEngine *engine,
 781                                GtkStateFlags     state,
 782                                GtkBorder        *border)
 783 {
 784   GtkThemingEnginePrivate *priv;
 785
 786   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 787
 788   priv = engine->priv;
 789   gtk_style_context_get_border (priv->context, state, border);
 790 }
 791
 792 /**
 793  * gtk_theming_engine_get_padding:
 794  * @engine: a #GtkthemingEngine
 795  * @state: state to retrieve the padding for
 796  * @padding: (out): return value for the padding settings
 797  *
 798  * Gets the padding for a given state as a #GtkBorder.
 799  *
 800  * Since: 3.0
 801  **/
 802 void
 803 gtk_theming_engine_get_padding (GtkThemingEngine *engine,
 804                                 GtkStateFlags     state,
 805                                 GtkBorder        *padding)
 806 {
 807   GtkThemingEnginePrivate *priv;
 808
 809   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 810
 811   priv = engine->priv;
 812   gtk_style_context_get_padding (priv->context, state, padding);
 813 }
 814
 815 /**
 816  * gtk_theming_engine_get_margin:
 817  * @engine: a #GtkThemingEngine
 818  * @state: state to retrieve the border for
 819  * @margin: (out): return value for the margin settings
 820  *
 821  * Gets the margin for a given state as a #GtkBorder.
 822  *
 823  * Since: 3.0
 824  **/
 825 void
 826 gtk_theming_engine_get_margin (GtkThemingEngine *engine,
 827                                GtkStateFlags     state,
 828                                GtkBorder        *margin)
 829 {
 830   GtkThemingEnginePrivate *priv;
 831
 832   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 833
 834   priv = engine->priv;
 835   gtk_style_context_get_margin (priv->context, state, margin);
 836 }
 837
 838 /**
 839  * gtk_theming_engine_get_font:
 840  * @engine: a #GtkThemingEngine
 841  * @state: state to retrieve the font for
 842  *
 843  * Returns the font description for a given state.
 844  *
 845  * Returns: (transfer none): the #PangoFontDescription for the given
 846  *          state. This object is owned by GTK+ and should not be
 847  *          freed.
 848  *
 849  * Since: 3.0
 850  **/
 851 const PangoFontDescription *
 852 gtk_theming_engine_get_font (GtkThemingEngine *engine,
 853                              GtkStateFlags     state)
 854 {
 855   GtkThemingEnginePrivate *priv;
 856
 857   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 858
 859   priv = engine->priv;
 860   return gtk_style_context_get_font (priv->context, state);
 861 }
 862
 863 /* GtkThemingModule */
 864
 865 static gboolean
 866 gtk_theming_module_load (GTypeModule *type_module)
 867 {
 868   GtkThemingModule *theming_module;
 869   GModule *module;
 870   gchar *name, *module_path;
 871
 872   theming_module = GTK_THEMING_MODULE (type_module);
 873   name = theming_module->name;
 874   module_path = _gtk_find_module (name, "theming-engines");
 875
 876   if (!module_path)
 877     return FALSE;
 878
 879   module = g_module_open (module_path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 880   g_free (module_path);
 881
 882   if (!module)
 883     return FALSE;
 884
 885   if (!g_module_symbol (module, "theme_init",
 886                         (gpointer *) &theming_module->init) ||
 887       !g_module_symbol (module, "theme_exit",
 888                         (gpointer *) &theming_module->exit) ||
 889       !g_module_symbol (module, "create_engine",
 890                         (gpointer *) &theming_module->create_engine))
 891     {
 892       g_module_close (module);
 893
 894       return FALSE;
 895     }
 896
 897   theming_module->module = module;
 898
 899   theming_module->init (G_TYPE_MODULE (theming_module));
 900
 901   return TRUE;
 902 }
 903
 904 static void
 905 gtk_theming_module_unload (GTypeModule *type_module)
 906 {
 907   GtkThemingModule *theming_module;
 908
 909   theming_module = GTK_THEMING_MODULE (type_module);
 910
 911   theming_module->exit ();
 912
 913   g_module_close (theming_module->module);
 914
 915   theming_module->module = NULL;
 916   theming_module->init = NULL;
 917   theming_module->exit = NULL;
 918   theming_module->create_engine = NULL;
 919 }
 920
 921 static void
 922 gtk_theming_module_class_init (GtkThemingModuleClass *klass)
 923 {
 924   GTypeModuleClass *module_class = G_TYPE_MODULE_CLASS (klass);
 925
 926   module_class->load = gtk_theming_module_load;
 927   module_class->unload = gtk_theming_module_unload;
 928 }
 929
 930 static void
 931 gtk_theming_module_init (GtkThemingModule *module)
 932 {
 933 }
 934
 935 /**
 936  * gtk_theming_engine_load:
 937  * @name: Theme engine name to load
 938  *
 939  * Loads and initializes a theming engine module from the
 940  * standard directories.
 941  *
 942  * Returns: (transfer none): A theming engine, or %NULL if
 943  * the engine @name doesn't exist.
 944  **/
 945 GtkThemingEngine *
 946 gtk_theming_engine_load (const gchar *name)
 947 {
 948   static GHashTable *engines = NULL;
 949   static GtkThemingEngine *default_engine;
 950   GtkThemingEngine *engine = NULL;
 951
 952   if (name)
 953     {
 954       if (!engines)
 955         engines = g_hash_table_new (g_str_hash, g_str_equal);
 956
 957       engine = g_hash_table_lookup (engines, name);
 958
 959       if (!engine)
 960         {
 961           GtkThemingModule *module;
 962
 963           module = g_object_new (GTK_TYPE_THEMING_MODULE, NULL);
 964           g_type_module_set_name (G_TYPE_MODULE (module), name);
 965           module->name = g_strdup (name);
 966
 967           if (module && g_type_module_use (G_TYPE_MODULE (module)))
 968             {
 969               engine = (module->create_engine) ();
 970
 971               if (engine)
 972                 g_hash_table_insert (engines, module->name, engine);
 973             }
 974         }
 975     }
 976   else
 977     {
 978       if (G_UNLIKELY (!default_engine))
 979         default_engine = g_object_new (GTK_TYPE_THEMING_ENGINE, NULL);
 980
 981       engine = default_engine;
 982     }
 983
 984   return engine;
 985 }
 986
 987 /**
 988  * gtk_theming_engine_get_screen:
 989  * @engine: a #GtkThemingEngine
 990  *
 991  * Returns the #GdkScreen to which @engine currently rendering to.
 992  *
 993  * Returns: (transfer none): a #GdkScreen, or %NULL.
 994  **/
 995 GdkScreen *
 996 gtk_theming_engine_get_screen (GtkThemingEngine *engine)
 997 {
 998   GtkThemingEnginePrivate *priv;
 999
1000   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
1001
1002   priv = engine->priv;
1003   return gtk_style_context_get_screen (priv->context);
1004 }
1005
1006 /* Paint method implementations */
1007 static void
1008 gtk_theming_engine_render_check (GtkThemingEngine *engine,
1009                                  cairo_t          *cr,
1010                                  gdouble           x,
1011                                  gdouble           y,
1012                                  gdouble           width,
1013                                  gdouble           height)
1014 {
1015   GdkRGBA fg_color, bg_color;
1016   GtkStateFlags flags;
1017   gint exterior_size, interior_size, thickness, pad;
1018   GtkBorderStyle border_style;
1019   GtkBorder border;
1020   gint border_width;
1021   GtkThemingBackground bg;
1022
1023   _gtk_theming_background_init (&bg, engine,
1024                                 x, y,
1025                                 width, height,
1026                                 gtk_theming_engine_get_junction_sides (engine));
1027
1028   if (_gtk_theming_background_has_background_image (&bg))
1029     {
1030       _gtk_theming_background_render (&bg, cr);
1031       return;
1032     }
1033
1034   flags = gtk_theming_engine_get_state (engine);
1035   cairo_save (cr);
1036
1037   gtk_theming_engine_get_color (engine, flags, &fg_color);
1038   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1039   gtk_theming_engine_get_border (engine, flags, &border);
1040
1041   gtk_theming_engine_get (engine, flags,
1042                           "border-style", &border_style,
1043                           NULL);
1044
1045   border_width = MIN (MIN (border.top, border.bottom),
1046                       MIN (border.left, border.right));
1047   exterior_size = MIN (width, height);
1048
1049   if (exterior_size % 2 == 0) /* Ensure odd */
1050     exterior_size -= 1;
1051
1052   /* FIXME: thickness */
1053   thickness = 1;
1054   pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1055   interior_size = MAX (1, exterior_size - 2 * pad);
1056
1057   if (interior_size < 7)
1058     {
1059       interior_size = 7;
1060       pad = MAX (0, (exterior_size - interior_size) / 2);
1061     }
1062
1063   x -= (1 + exterior_size - (gint) width) / 2;
1064   y -= (1 + exterior_size - (gint) height) / 2;
1065
1066   if (border_style == GTK_BORDER_STYLE_SOLID)
1067     {
1068       GdkRGBA border_color;
1069
1070       cairo_set_line_width (cr, border_width);
1071       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1072
1073       cairo_rectangle (cr, x + 0.5, y + 0.5, exterior_size - 1, exterior_size - 1);
1074       gdk_cairo_set_source_rgba (cr, &bg_color);
1075       cairo_fill_preserve (cr);
1076
1077       gdk_cairo_set_source_rgba (cr, &border_color);
1078       cairo_stroke (cr);
1079     }
1080
1081   gdk_cairo_set_source_rgba (cr, &fg_color);
1082
1083   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1084     {
1085       int line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1086
1087       cairo_rectangle (cr,
1088                        x + pad,
1089                        y + pad + (1 + interior_size - line_thickness) / 2,
1090                        interior_size,
1091                        line_thickness);
1092       cairo_fill (cr);
1093     }
1094   else
1095     {
1096       gdouble progress;
1097       gboolean running;
1098
1099       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1100
1101       if ((flags & GTK_STATE_FLAG_ACTIVE) || running)
1102         {
1103           if (!running)
1104             progress = 1;
1105
1106           cairo_translate (cr,
1107                            x + pad, y + pad);
1108
1109           cairo_scale (cr, interior_size / 7., interior_size / 7.);
1110
1111           cairo_rectangle (cr, 0, 0, 7 * progress, 7);
1112           cairo_clip (cr);
1113
1114           cairo_move_to  (cr, 7.0, 0.0);
1115           cairo_line_to  (cr, 7.5, 1.0);
1116           cairo_curve_to (cr, 5.3, 2.0,
1117                           4.3, 4.0,
1118                           3.5, 7.0);
1119           cairo_curve_to (cr, 3.0, 5.7,
1120                           1.3, 4.7,
1121                           0.0, 4.7);
1122           cairo_line_to  (cr, 0.2, 3.5);
1123           cairo_curve_to (cr, 1.1, 3.5,
1124                           2.3, 4.3,
1125                           3.0, 5.0);
1126           cairo_curve_to (cr, 1.0, 3.9,
1127                           2.4, 4.1,
1128                           3.2, 4.9);
1129           cairo_curve_to (cr, 3.5, 3.1,
1130                           5.2, 2.0,
1131                           7.0, 0.0);
1132
1133           cairo_fill (cr);
1134         }
1135     }
1136
1137   cairo_restore (cr);
1138 }
1139
1140 static void
1141 gtk_theming_engine_render_option (GtkThemingEngine *engine,
1142                                   cairo_t          *cr,
1143                                   gdouble           x,
1144                                   gdouble           y,
1145                                   gdouble           width,
1146                                   gdouble           height)
1147 {
1148   GtkStateFlags flags;
1149   GdkRGBA fg_color, bg_color;
1150   gint exterior_size, interior_size, pad, thickness, border_width;
1151   GtkBorderStyle border_style;
1152   GtkBorder border;
1153   GtkThemingBackground bg;
1154
1155   _gtk_theming_background_init (&bg, engine,
1156                                 x, y,
1157                                 width, height,
1158                                 gtk_theming_engine_get_junction_sides (engine));
1159
1160   if (_gtk_theming_background_has_background_image (&bg))
1161     {
1162       _gtk_theming_background_render (&bg, cr);
1163       return;
1164     }
1165
1166   flags = gtk_theming_engine_get_state (engine);
1167
1168   cairo_save (cr);
1169
1170   gtk_theming_engine_get_color (engine, flags, &fg_color);
1171   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1172   gtk_theming_engine_get_border (engine, flags, &border);
1173
1174   gtk_theming_engine_get (engine, flags,
1175                           "border-style", &border_style,
1176                           NULL);
1177
1178   exterior_size = MIN (width, height);
1179   border_width = MIN (MIN (border.top, border.bottom),
1180                       MIN (border.left, border.right));
1181
1182   if (exterior_size % 2 == 0) /* Ensure odd */
1183     exterior_size -= 1;
1184
1185   x -= (1 + exterior_size - width) / 2;
1186   y -= (1 + exterior_size - height) / 2;
1187
1188   if (border_style == GTK_BORDER_STYLE_SOLID)
1189     {
1190       GdkRGBA border_color;
1191
1192       cairo_set_line_width (cr, border_width);
1193       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1194
1195       cairo_new_sub_path (cr);
1196       cairo_arc (cr,
1197                  x + exterior_size / 2.,
1198                  y + exterior_size / 2.,
1199                  (exterior_size - 1) / 2.,
1200                  0, 2 * G_PI);
1201
1202       gdk_cairo_set_source_rgba (cr, &bg_color);
1203       cairo_fill_preserve (cr);
1204
1205       gdk_cairo_set_source_rgba (cr, &border_color);
1206       cairo_stroke (cr);
1207     }
1208
1209   gdk_cairo_set_source_rgba (cr, &fg_color);
1210
1211   /* FIXME: thickness */
1212   thickness = 1;
1213
1214   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1215     {
1216       gint line_thickness;
1217
1218       pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1219       interior_size = MAX (1, exterior_size - 2 * pad);
1220
1221       if (interior_size < 7)
1222         {
1223           interior_size = 7;
1224           pad = MAX (0, (exterior_size - interior_size) / 2);
1225         }
1226
1227       line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1228
1229       cairo_rectangle (cr,
1230                        x + pad,
1231                        y + pad + (interior_size - line_thickness) / 2.,
1232                        interior_size,
1233                        line_thickness);
1234       cairo_fill (cr);
1235     }
1236   if (flags & GTK_STATE_FLAG_ACTIVE)
1237     {
1238       pad = thickness + MAX (1, 2 * (exterior_size - 2 * thickness) / 9);
1239       interior_size = MAX (1, exterior_size - 2 * pad);
1240
1241       if (interior_size < 5)
1242         {
1243           interior_size = 7;
1244           pad = MAX (0, (exterior_size - interior_size) / 2);
1245         }
1246
1247       cairo_new_sub_path (cr);
1248       cairo_arc (cr,
1249                  x + pad + interior_size / 2.,
1250                  y + pad + interior_size / 2.,
1251                  interior_size / 2.,
1252                  0, 2 * G_PI);
1253       cairo_fill (cr);
1254     }
1255
1256   cairo_restore (cr);
1257 }
1258
1259 static void
1260 add_path_arrow (cairo_t *cr,
1261                 gdouble  angle,
1262                 gdouble  x,
1263                 gdouble  y,
1264                 gdouble  size)
1265 {
1266   cairo_save (cr);
1267
1268   cairo_translate (cr, x + (size / 2), y + (size / 2));
1269   cairo_rotate (cr, angle);
1270
1271   cairo_move_to (cr, 0, - (size / 4));
1272   cairo_line_to (cr, - (size / 2), (size / 4));
1273   cairo_line_to (cr, (size / 2), (size / 4));
1274   cairo_close_path (cr);
1275
1276   cairo_restore (cr);
1277 }
1278
1279 static void
1280 gtk_theming_engine_render_arrow (GtkThemingEngine *engine,
1281                                  cairo_t          *cr,
1282                                  gdouble           angle,
1283                                  gdouble           x,
1284                                  gdouble           y,
1285                                  gdouble           size)
1286 {
1287   GtkStateFlags flags;
1288   GdkRGBA fg_color;
1289
1290   cairo_save (cr);
1291
1292   flags = gtk_theming_engine_get_state (engine);
1293   gtk_theming_engine_get_color (engine, flags, &fg_color);
1294
1295   if (flags & GTK_STATE_FLAG_INSENSITIVE)
1296     {
1297       add_path_arrow (cr, angle, x + 1, y + 1, size);
1298       cairo_set_source_rgb (cr, 1, 1, 1);
1299       cairo_fill (cr);
1300     }
1301
1302   add_path_arrow (cr, angle, x, y, size);
1303   gdk_cairo_set_source_rgba (cr, &fg_color);
1304   cairo_fill (cr);
1305
1306   cairo_restore (cr);
1307 }
1308
1309 static void
1310 add_path_line (cairo_t        *cr,
1311                gdouble         x1,
1312                gdouble         y1,
1313                gdouble         x2,
1314                gdouble         y2)
1315 {
1316   /* Adjust endpoints */
1317   if (y1 == y2)
1318     {
1319       y1 += 0.5;
1320       y2 += 0.5;
1321       x2 += 1;
1322     }
1323   else if (x1 == x2)
1324     {
1325       x1 += 0.5;
1326       x2 += 0.5;
1327       y2 += 1;
1328     }
1329
1330   cairo_move_to (cr, x1, y1);
1331   cairo_line_to (cr, x2, y2);
1332 }
1333
1334 static void
1335 color_shade (const GdkRGBA *color,
1336              gdouble        factor,
1337              GdkRGBA       *color_return)
1338 {
1339   GtkSymbolicColor *literal, *shade;
1340
1341   literal = gtk_symbolic_color_new_literal (color);
1342   shade = gtk_symbolic_color_new_shade (literal, factor);
1343   gtk_symbolic_color_unref (literal);
1344
1345   gtk_symbolic_color_resolve (shade, NULL, color_return);
1346   gtk_symbolic_color_unref (shade);
1347 }
1348
1349 static void
1350 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1351                                       cairo_t          *cr,
1352                                       gdouble           x,
1353                                       gdouble           y,
1354                                       gdouble           width,
1355                                       gdouble           height)
1356 {
1357   GtkThemingBackground bg;
1358
1359   _gtk_theming_background_init (&bg, engine,
1360                                 x, y,
1361                                 width, height,
1362                                 gtk_theming_engine_get_junction_sides (engine));
1363
1364   _gtk_theming_background_render (&bg, cr);
1365 }
1366
1367 static void
1368 gtk_theming_engine_hide_border_sides (GtkBorder *border,
1369                                       guint      hidden_side)
1370 {
1371   if (hidden_side & SIDE_TOP)
1372     border->top = 0;
1373   if (hidden_side & SIDE_RIGHT)
1374     border->right = 0;
1375   if (hidden_side & SIDE_BOTTOM)
1376     border->bottom = 0;
1377   if (hidden_side & SIDE_LEFT)
1378     border->left = 0;
1379 }
1380
1381 static void
1382 render_frame_internal (GtkThemingEngine *engine,
1383                        cairo_t          *cr,
1384                        gdouble           x,
1385                        gdouble           y,
1386                        gdouble           width,
1387                        gdouble           height,
1388                        guint             hidden_side,
1389                        GtkJunctionSides  junction)
1390 {
1391   GtkStateFlags state;
1392   GtkBorderStyle border_style;
1393   GtkRoundedBox border_box, padding_box;
1394   gdouble progress;
1395   gboolean running;
1396   GtkBorder border;
1397   static const guint current_side[4] = { SIDE_TOP, SIDE_RIGHT, SIDE_BOTTOM, SIDE_LEFT };
1398   GdkRGBA *colors[4];
1399   guint i, j;
1400
1401   state = gtk_theming_engine_get_state (engine);
1402
1403   gtk_theming_engine_get_border (engine, state, &border);
1404   gtk_theming_engine_hide_border_sides (&border, hidden_side);
1405
1406   gtk_theming_engine_get (engine, state,
1407                           "border-style", &border_style,
1408                           "border-top-color", &colors[0],
1409                           "border-right-color", &colors[1],
1410                           "border-bottom-color", &colors[2],
1411                           "border-left-color", &colors[3],
1412                           NULL);
1413
1414   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1415
1416   if (running)
1417     {
1418       GtkStateFlags other_state;
1419       GdkRGBA *other_colors[4];
1420
1421       if (state & GTK_STATE_FLAG_PRELIGHT)
1422         {
1423           other_state = state & ~(GTK_STATE_FLAG_PRELIGHT);
1424           progress = 1 - progress;
1425         }
1426       else
1427         other_state = state | GTK_STATE_FLAG_PRELIGHT;
1428
1429       gtk_theming_engine_get (engine, other_state,
1430                               "border-top-color", &other_colors[0],
1431                               "border-right-color", &other_colors[1],
1432                               "border-bottom-color", &other_colors[2],
1433                               "border-left-color", &other_colors[3],
1434                               NULL);
1435
1436       for (i = 0; i < 4; i++)
1437         {
1438           colors[i]->red = CLAMP (colors[i]->red + ((other_colors[i]->red - colors[i]->red) * progress), 0, 1);
1439           colors[i]->green = CLAMP (colors[i]->green + ((other_colors[i]->green - colors[i]->green) * progress), 0, 1);
1440           colors[i]->blue = CLAMP (colors[i]->blue + ((other_colors[i]->blue - colors[i]->blue) * progress), 0, 1);
1441           colors[i]->alpha = CLAMP (colors[i]->alpha + ((other_colors[i]->alpha - colors[i]->alpha) * progress), 0, 1);
1442           gdk_rgba_free (other_colors[i]);
1443         }
1444     }
1445
1446   switch (border_style)
1447     {
1448     default:
1449       g_assert_not_reached ();
1450     case GTK_BORDER_STYLE_NONE:
1451     case GTK_BORDER_STYLE_SOLID:
1452       break;
1453     case GTK_BORDER_STYLE_INSET:
1454       color_shade (colors[1], 1.8, colors[1]);
1455       color_shade (colors[2], 1.8, colors[2]);
1456       break;
1457     case GTK_BORDER_STYLE_OUTSET:
1458       color_shade (colors[0], 1.8, colors[0]);
1459       color_shade (colors[3], 1.8, colors[3]);
1460       break;
1461     }
1462
1463   cairo_save (cr);
1464
1465   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
1466
1467   _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1468   _gtk_rounded_box_apply_border_radius (&border_box, engine, state, junction);
1469   padding_box = border_box;
1470   _gtk_rounded_box_shrink (&padding_box, border.top, border.right, border.bottom, border.left);
1471
1472   switch (border_style)
1473     {
1474     case GTK_BORDER_STYLE_NONE:
1475       break;
1476     case GTK_BORDER_STYLE_SOLID:
1477     case GTK_BORDER_STYLE_INSET:
1478     case GTK_BORDER_STYLE_OUTSET:
1479
1480       if (gdk_rgba_equal (colors[0], colors[1]) &&
1481           gdk_rgba_equal (colors[0], colors[2]) &&
1482           gdk_rgba_equal (colors[0], colors[3]))
1483         {
1484           gdk_cairo_set_source_rgba (cr, colors[0]);
1485
1486           _gtk_rounded_box_path (&border_box, cr);
1487           _gtk_rounded_box_path (&padding_box, cr);
1488           cairo_fill (cr);
1489         }
1490       else
1491         {
1492           for (i = 0; i < 4; i++)
1493             {
1494               if (hidden_side & current_side[i])
1495                 continue;
1496
1497               for (j = 0; j < 4; j++)
1498                 {
1499                   if (hidden_side & current_side[j])
1500                     continue;
1501
1502                   if (i == j ||
1503                       gdk_rgba_equal (colors[i], colors[j]))
1504                     {
1505                       /* We were already painted when i == j */
1506                       if (i > j)
1507                         break;
1508
1509                       if (j == 0)
1510                         _gtk_rounded_box_path_top (&border_box, &padding_box, cr);
1511                       else if (j == 1)
1512                         _gtk_rounded_box_path_right (&border_box, &padding_box, cr);
1513                       else if (j == 2)
1514                         _gtk_rounded_box_path_bottom (&border_box, &padding_box, cr);
1515                       else if (j == 3)
1516                         _gtk_rounded_box_path_left (&border_box, &padding_box, cr);
1517                     }
1518                 }
1519               /* We were already painted when i == j */
1520               if (i > j)
1521                 continue;
1522
1523               gdk_cairo_set_source_rgba (cr, colors[i]);
1524
1525               cairo_fill (cr);
1526             }
1527         }
1528       break;
1529     }
1530
1531   cairo_restore (cr);
1532
1533   for (i = 0; i < 4; i++)
1534     gdk_rgba_free (colors[i]);
1535 }
1536
1537 static void
1538 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1539                                  cairo_t          *cr,
1540                                  gdouble           x,
1541                                  gdouble           y,
1542                                  gdouble           width,
1543                                  gdouble           height)
1544 {
1545   GtkStateFlags flags;
1546   GtkBorderStyle border_style;
1547   GtkJunctionSides junction;
1548   GtkBorderImage *border_image;
1549   GtkBorder border;
1550
1551   flags = gtk_theming_engine_get_state (engine);
1552   junction = gtk_theming_engine_get_junction_sides (engine);
1553   gtk_theming_engine_get_border (engine, flags, &border);
1554
1555   border_image = _gtk_border_image_new_for_engine (engine);
1556   gtk_theming_engine_get (engine, flags,
1557                           "border-style", &border_style,
1558                           NULL);
1559
1560   if (border_image != NULL)
1561     {
1562       _gtk_border_image_render (border_image, &border,
1563                                 cr, x, y, width, height);
1564       _gtk_border_image_unref (border_image);
1565     }
1566   else if (border_style != GTK_BORDER_STYLE_NONE)
1567     render_frame_internal (engine, cr,
1568                            x, y, width, height,
1569                            0, junction);
1570 }
1571
1572 static void
1573 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1574                                     cairo_t          *cr,
1575                                     gdouble           x,
1576                                     gdouble           y,
1577                                     gdouble           width,
1578                                     gdouble           height)
1579 {
1580   GtkStateFlags flags;
1581   GdkRGBA outline_color, fg_color;
1582   double vertical_overshoot;
1583   int diameter;
1584   double radius;
1585   double interp;                /* interpolation factor for center position */
1586   double x_double_horz, y_double_horz;
1587   double x_double_vert, y_double_vert;
1588   double x_double, y_double;
1589   gdouble angle;
1590   gint line_width;
1591   gboolean running, is_rtl;
1592   gdouble progress;
1593
1594   cairo_save (cr);
1595   flags = gtk_theming_engine_get_state (engine);
1596
1597   gtk_theming_engine_get_color (engine, flags, &fg_color);
1598   gtk_theming_engine_get_border_color (engine, flags, &outline_color);
1599
1600   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1601   is_rtl = (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL);
1602   line_width = 1;
1603
1604   if (!running)
1605     progress = (flags & GTK_STATE_FLAG_ACTIVE) ? 1 : 0;
1606
1607   if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_HORIZONTAL))
1608     {
1609       if (is_rtl)
1610         angle = (G_PI) - ((G_PI / 2) * progress);
1611       else
1612         angle = (G_PI / 2) * progress;
1613     }
1614   else
1615     {
1616       if (is_rtl)
1617         angle = (G_PI / 2) + ((G_PI / 2) * progress);
1618       else
1619         angle = (G_PI / 2) - ((G_PI / 2) * progress);
1620     }
1621
1622   interp = progress;
1623
1624   /* Compute distance that the stroke extends beyonds the end
1625    * of the triangle we draw.
1626    */
1627   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
1628
1629   /* For odd line widths, we end the vertical line of the triangle
1630    * at a half pixel, so we round differently.
1631    */
1632   if (line_width % 2 == 1)
1633     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
1634   else
1635     vertical_overshoot = ceil (vertical_overshoot);
1636
1637   /* Adjust the size of the triangle we draw so that the entire stroke fits
1638    */
1639   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
1640
1641   /* If the line width is odd, we want the diameter to be even,
1642    * and vice versa, so force the sum to be odd. This relationship
1643    * makes the point of the triangle look right.
1644    */
1645   diameter -= (1 - (diameter + line_width) % 2);
1646
1647   radius = diameter / 2.;
1648
1649   /* Adjust the center so that the stroke is properly aligned with
1650    * the pixel grid. The center adjustment is different for the
1651    * horizontal and vertical orientations. For intermediate positions
1652    * we interpolate between the two.
1653    */
1654   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1655   y_double_vert = (y + height / 2) - 0.5;
1656
1657   x_double_horz = (x + width / 2) - 0.5;
1658   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1659
1660   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
1661   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
1662
1663   cairo_translate (cr, x_double, y_double);
1664   cairo_rotate (cr, angle);
1665
1666   cairo_move_to (cr, - radius / 2., - radius);
1667   cairo_line_to (cr,   radius / 2.,   0);
1668   cairo_line_to (cr, - radius / 2.,   radius);
1669   cairo_close_path (cr);
1670
1671   cairo_set_line_width (cr, line_width);
1672
1673   gdk_cairo_set_source_rgba (cr, &fg_color);
1674
1675   cairo_fill_preserve (cr);
1676
1677   gdk_cairo_set_source_rgba (cr, &outline_color);
1678   cairo_stroke (cr);
1679
1680   cairo_restore (cr);
1681 }
1682
1683 static void
1684 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
1685                                  cairo_t          *cr,
1686                                  gdouble           x,
1687                                  gdouble           y,
1688                                  gdouble           width,
1689                                  gdouble           height)
1690 {
1691   GtkStateFlags flags;
1692   GdkRGBA color;
1693   gint line_width;
1694   gint8 *dash_list;
1695
1696   cairo_save (cr);
1697   flags = gtk_theming_engine_get_state (engine);
1698
1699   gtk_theming_engine_get_color (engine, flags, &color);
1700
1701   gtk_theming_engine_get_style (engine,
1702                                 "focus-line-width", &line_width,
1703                                 "focus-line-pattern", (gchar *) &dash_list,
1704                                 NULL);
1705
1706   cairo_set_line_width (cr, (gdouble) line_width);
1707
1708   if (dash_list[0])
1709     {
1710       gint n_dashes = strlen ((const gchar *) dash_list);
1711       gdouble *dashes = g_new (gdouble, n_dashes);
1712       gdouble total_length = 0;
1713       gdouble dash_offset;
1714       gint i;
1715
1716       for (i = 0; i < n_dashes; i++)
1717         {
1718           dashes[i] = dash_list[i];
1719           total_length += dash_list[i];
1720         }
1721
1722       /* The dash offset here aligns the pattern to integer pixels
1723        * by starting the dash at the right side of the left border
1724        * Negative dash offsets in cairo don't work
1725        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
1726        */
1727       dash_offset = - line_width / 2.;
1728
1729       while (dash_offset < 0)
1730         dash_offset += total_length;
1731
1732       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
1733       g_free (dashes);
1734     }
1735
1736   cairo_rectangle (cr,
1737                    x + line_width / 2.,
1738                    y + line_width / 2.,
1739                    width - line_width,
1740                    height - line_width);
1741
1742   gdk_cairo_set_source_rgba (cr, &color);
1743   cairo_stroke (cr);
1744
1745   cairo_restore (cr);
1746
1747   g_free (dash_list);
1748 }
1749
1750 static void
1751 gtk_theming_engine_render_line (GtkThemingEngine *engine,
1752                                 cairo_t          *cr,
1753                                 gdouble           x0,
1754                                 gdouble           y0,
1755                                 gdouble           x1,
1756                                 gdouble           y1)
1757 {
1758   GdkRGBA color;
1759   GtkStateFlags flags;
1760
1761   flags = gtk_theming_engine_get_state (engine);
1762   cairo_save (cr);
1763
1764   gtk_theming_engine_get_color (engine, flags, &color);
1765
1766   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1767   cairo_set_line_width (cr, 1);
1768
1769   cairo_move_to (cr, x0 + 0.5, y0 + 0.5);
1770   cairo_line_to (cr, x1 + 0.5, y1 + 0.5);
1771
1772   gdk_cairo_set_source_rgba (cr, &color);
1773   cairo_stroke (cr);
1774
1775   cairo_restore (cr);
1776 }
1777
1778 static void
1779 prepare_context_for_layout (cairo_t *cr,
1780                             gdouble x,
1781                             gdouble y,
1782                             PangoLayout *layout)
1783 {
1784   const PangoMatrix *matrix;
1785
1786   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
1787
1788   cairo_move_to (cr, x, y);
1789
1790   if (matrix)
1791     {
1792       cairo_matrix_t cairo_matrix;
1793
1794       cairo_matrix_init (&cairo_matrix,
1795                          matrix->xx, matrix->yx,
1796                          matrix->xy, matrix->yy,
1797                          matrix->x0, matrix->y0);
1798
1799       cairo_transform (cr, &cairo_matrix);
1800     }
1801 }
1802
1803 static void
1804 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
1805                                   cairo_t          *cr,
1806                                   gdouble           x,
1807                                   gdouble           y,
1808                                   PangoLayout      *layout)
1809 {
1810   GdkRGBA fg_color;
1811   GtkShadow *text_shadow = NULL;
1812   GtkStateFlags flags;
1813   gdouble progress;
1814   gboolean running;
1815
1816   cairo_save (cr);
1817   flags = gtk_theming_engine_get_state (engine);
1818   gtk_theming_engine_get_color (engine, flags, &fg_color);
1819
1820   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1821
1822   if (running)
1823     {
1824       GtkStateFlags other_flags;
1825       GdkRGBA other_fg;
1826
1827       if (flags & GTK_STATE_FLAG_PRELIGHT)
1828         {
1829           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
1830           progress = 1 - progress;
1831         }
1832       else
1833         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
1834
1835       gtk_theming_engine_get_color (engine, other_flags, &other_fg);
1836
1837       fg_color.red = CLAMP (fg_color.red + ((other_fg.red - fg_color.red) * progress), 0, 1);
1838       fg_color.green = CLAMP (fg_color.green + ((other_fg.green - fg_color.green) * progress), 0, 1);
1839       fg_color.blue = CLAMP (fg_color.blue + ((other_fg.blue - fg_color.blue) * progress), 0, 1);
1840       fg_color.alpha = CLAMP (fg_color.alpha + ((other_fg.alpha - fg_color.alpha) * progress), 0, 1);
1841     }
1842
1843   gtk_theming_engine_get (engine, flags,
1844                           "text-shadow", &text_shadow,
1845                           NULL);
1846
1847   prepare_context_for_layout (cr, x, y, layout);
1848
1849   if (text_shadow != NULL)
1850     {
1851       _gtk_text_shadow_paint_layout (text_shadow, cr, layout);
1852       _gtk_shadow_unref (text_shadow);
1853     }
1854
1855   gdk_cairo_set_source_rgba (cr, &fg_color);
1856   pango_cairo_show_layout (cr, layout);
1857
1858   cairo_restore (cr);
1859 }
1860
1861 static void
1862 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
1863                                   cairo_t          *cr,
1864                                   gdouble           x,
1865                                   gdouble           y,
1866                                   gdouble           width,
1867                                   gdouble           height,
1868                                   GtkOrientation    orientation)
1869 {
1870   const GtkWidgetPath *path;
1871   gint thickness;
1872
1873   path = gtk_theming_engine_get_path (engine);
1874
1875   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
1876   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
1877
1878   /* FIXME: thickness */
1879   thickness = 2;
1880
1881   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
1882     {
1883       if (orientation == GTK_ORIENTATION_VERTICAL)
1884         gtk_theming_engine_render_line (engine, cr,
1885                                         x + thickness,
1886                                         y + (gint) height / 2,
1887                                         x + width - thickness - 1,
1888                                         y + (gint) height / 2);
1889       else
1890         gtk_theming_engine_render_line (engine, cr,
1891                                         x + (gint) width / 2,
1892                                         y + thickness,
1893                                         x + (gint) width / 2,
1894                                         y + height - thickness - 1);
1895     }
1896 }
1897
1898 static void
1899 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
1900                                      cairo_t          *cr,
1901                                      gdouble           x,
1902                                      gdouble           y,
1903                                      gdouble           width,
1904                                      gdouble           height,
1905                                      GtkPositionType   gap_side,
1906                                      gdouble           xy0_gap,
1907                                      gdouble           xy1_gap)
1908 {
1909   GtkJunctionSides junction;
1910   GtkStateFlags state;
1911   gint border_width;
1912   GtkCssBorderCornerRadius *top_left_radius, *top_right_radius;
1913   GtkCssBorderCornerRadius *bottom_left_radius, *bottom_right_radius;
1914   gdouble x0, y0, x1, y1, xc, yc, wc, hc;
1915   GtkBorderImage *border_image;
1916   GtkBorder border;
1917
1918   xc = yc = wc = hc = 0;
1919   state = gtk_theming_engine_get_state (engine);
1920   junction = gtk_theming_engine_get_junction_sides (engine);
1921
1922   gtk_theming_engine_get_border (engine, state, &border);
1923   border_image = _gtk_border_image_new_for_engine (engine);
1924   gtk_theming_engine_get (engine, state,
1925                           "border-top-left-radius", &top_left_radius,
1926                           "border-top-right-radius", &top_right_radius,
1927                           "border-bottom-right-radius", &bottom_right_radius,
1928                           "border-bottom-left-radius", &bottom_left_radius,
1929                           NULL);
1930
1931   border_width = MIN (MIN (border.top, border.bottom),
1932                       MIN (border.left, border.right));
1933
1934   cairo_save (cr);
1935
1936   switch (gap_side)
1937     {
1938     case GTK_POS_TOP:
1939       xc = x + xy0_gap + border_width;
1940       yc = y;
1941       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
1942       hc = border_width;
1943
1944       if (xy0_gap < top_left_radius->horizontal)
1945         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
1946
1947       if (xy1_gap > width - top_right_radius->horizontal)
1948         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
1949       break;
1950     case GTK_POS_BOTTOM:
1951       xc = x + xy0_gap + border_width;
1952       yc = y + height - border_width;
1953       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
1954       hc = border_width;
1955
1956       if (xy0_gap < bottom_left_radius->horizontal)
1957         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
1958
1959       if (xy1_gap > width - bottom_right_radius->horizontal)
1960         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
1961
1962       break;
1963     case GTK_POS_LEFT:
1964       xc = x;
1965       yc = y + xy0_gap + border_width;
1966       wc = border_width;
1967       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
1968
1969       if (xy0_gap < top_left_radius->vertical)
1970         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
1971
1972       if (xy1_gap > height - bottom_left_radius->vertical)
1973         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
1974
1975       break;
1976     case GTK_POS_RIGHT:
1977       xc = x + width - border_width;
1978       yc = y + xy0_gap + border_width;
1979       wc = border_width;
1980       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
1981
1982       if (xy0_gap < top_right_radius->vertical)
1983         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
1984
1985       if (xy1_gap > height - bottom_right_radius->vertical)
1986         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
1987
1988       break;
1989     }
1990
1991   cairo_clip_extents (cr, &x0, &y0, &x1, &y1);
1992   cairo_rectangle (cr, x0, y0, x1 - x0, yc - y0);
1993   cairo_rectangle (cr, x0, yc, xc - x0, hc);
1994   cairo_rectangle (cr, xc + wc, yc, x1 - (xc + wc), hc);
1995   cairo_rectangle (cr, x0, yc + hc, x1 - x0, y1 - (yc + hc));
1996   cairo_clip (cr);
1997
1998   if (border_image != NULL)
1999     {
2000       _gtk_border_image_render (border_image, &border,
2001                                 cr, x, y, width, height);
2002       _gtk_border_image_unref (border_image);
2003     }
2004   else
2005     render_frame_internal (engine, cr,
2006                            x, y, width, height,
2007                            0, junction);
2008
2009   cairo_restore (cr);
2010
2011   g_free (top_left_radius);
2012   g_free (top_right_radius);
2013   g_free (bottom_right_radius);
2014   g_free (bottom_left_radius);
2015 }
2016
2017 static void
2018 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2019                                      cairo_t          *cr,
2020                                      gdouble           x,
2021                                      gdouble           y,
2022                                      gdouble           width,
2023                                      gdouble           height,
2024                                      GtkPositionType   gap_side)
2025 {
2026   GtkThemingBackground bg;
2027   GtkJunctionSides junction = 0;
2028   guint hidden_side = 0;
2029
2030   cairo_save (cr);
2031
2032   switch (gap_side)
2033     {
2034     case GTK_POS_LEFT:
2035       junction = GTK_JUNCTION_LEFT;
2036       hidden_side = SIDE_LEFT;
2037
2038       cairo_translate (cr, x + width, y);
2039       cairo_rotate (cr, G_PI / 2);
2040       break;
2041     case GTK_POS_RIGHT:
2042       junction = GTK_JUNCTION_RIGHT;
2043       hidden_side = SIDE_RIGHT;
2044
2045       cairo_translate (cr, x, y + height);
2046       cairo_rotate (cr, - G_PI / 2);
2047       break;
2048     case GTK_POS_TOP:
2049       junction = GTK_JUNCTION_TOP;
2050       hidden_side = SIDE_TOP;
2051
2052       cairo_translate (cr, x + width, y + height);
2053       cairo_rotate (cr, G_PI);
2054       break;
2055     case GTK_POS_BOTTOM:
2056       junction = GTK_JUNCTION_BOTTOM;
2057       hidden_side = SIDE_BOTTOM;
2058
2059       cairo_translate (cr, x, y);
2060       break;
2061     }
2062
2063   if (gap_side == GTK_POS_TOP ||
2064       gap_side == GTK_POS_BOTTOM)
2065     _gtk_theming_background_init (&bg, engine,
2066                                   0, 0,
2067                                   width, height,
2068                                   GTK_JUNCTION_BOTTOM);
2069   else
2070     _gtk_theming_background_init (&bg, engine,
2071                                   0, 0,
2072                                   height, width,
2073                                   GTK_JUNCTION_BOTTOM);
2074
2075   _gtk_theming_background_render (&bg, cr);
2076
2077   cairo_restore (cr);
2078
2079   cairo_save (cr);
2080
2081   render_frame_internal (engine, cr,
2082                          x, y, width, height,
2083                          hidden_side, junction);
2084
2085   cairo_restore (cr);
2086 }
2087
2088 static void
2089 render_dot (cairo_t       *cr,
2090             const GdkRGBA *lighter,
2091             const GdkRGBA *darker,
2092             gdouble        x,
2093             gdouble        y,
2094             gdouble        size)
2095 {
2096   size = CLAMP ((gint) size, 2, 3);
2097
2098   if (size == 2)
2099     {
2100       gdk_cairo_set_source_rgba (cr, lighter);
2101       cairo_rectangle (cr, x, y, 1, 1);
2102       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2103       cairo_fill (cr);
2104     }
2105   else if (size == 3)
2106     {
2107       gdk_cairo_set_source_rgba (cr, lighter);
2108       cairo_rectangle (cr, x, y, 2, 1);
2109       cairo_rectangle (cr, x, y, 1, 2);
2110       cairo_fill (cr);
2111
2112       gdk_cairo_set_source_rgba (cr, darker);
2113       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2114       cairo_rectangle (cr, x + 2, y, 1, 2);
2115       cairo_fill (cr);
2116     }
2117 }
2118
2119 static void
2120 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2121                                   cairo_t          *cr,
2122                                   gdouble           x,
2123                                   gdouble           y,
2124                                   gdouble           width,
2125                                   gdouble           height)
2126 {
2127   GtkStateFlags flags;
2128   GdkRGBA bg_color, lighter, darker;
2129   GtkJunctionSides sides;
2130   GtkThemingBackground bg;
2131   gint xx, yy;
2132
2133   cairo_save (cr);
2134   flags = gtk_theming_engine_get_state (engine);
2135
2136   cairo_set_line_width (cr, 1.0);
2137   sides = gtk_theming_engine_get_junction_sides (engine);
2138   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2139
2140   color_shade (&bg_color, 0.7, &darker);
2141   color_shade (&bg_color, 1.3, &lighter);
2142
2143   _gtk_theming_background_init (&bg, engine, x, y, width, height, sides);
2144   _gtk_theming_background_render (&bg, cr);
2145
2146   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_GRIP))
2147     {
2148       /* reduce confusing values to a meaningful state */
2149       if ((sides & (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)) == (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT))
2150         sides &= ~GTK_JUNCTION_CORNER_TOPLEFT;
2151
2152       if ((sides & (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT)) == (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT))
2153         sides &= ~GTK_JUNCTION_CORNER_TOPRIGHT;
2154
2155       if (sides == 0)
2156         sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2157
2158       /* align drawing area to the connected side */
2159       if (sides == GTK_JUNCTION_LEFT)
2160         {
2161           if (height < width)
2162             width = height;
2163         }
2164       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2165         {
2166           if (width < height)
2167             height = width;
2168           else if (height < width)
2169             width = height;
2170         }
2171       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2172         {
2173           /* make it square, aligning to bottom left */
2174           if (width < height)
2175             {
2176               y += (height - width);
2177               height = width;
2178             }
2179           else if (height < width)
2180             width = height;
2181         }
2182       else if (sides == GTK_JUNCTION_RIGHT)
2183         {
2184           /* aligning to right */
2185           if (height < width)
2186             {
2187               x += (width - height);
2188               width = height;
2189             }
2190         }
2191       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2192         {
2193           if (width < height)
2194             height = width;
2195           else if (height < width)
2196             {
2197               x += (width - height);
2198               width = height;
2199             }
2200         }
2201       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2202         {
2203           /* make it square, aligning to bottom right */
2204           if (width < height)
2205             {
2206               y += (height - width);
2207               height = width;
2208             }
2209           else if (height < width)
2210             {
2211               x += (width - height);
2212               width = height;
2213             }
2214         }
2215       else if (sides == GTK_JUNCTION_TOP)
2216         {
2217           if (width < height)
2218             height = width;
2219         }
2220       else if (sides == GTK_JUNCTION_BOTTOM)
2221         {
2222           /* align to bottom */
2223           if (width < height)
2224             {
2225               y += (height - width);
2226               height = width;
2227             }
2228         }
2229       else
2230         g_assert_not_reached ();
2231
2232       if (sides == GTK_JUNCTION_LEFT ||
2233           sides == GTK_JUNCTION_RIGHT)
2234         {
2235           gint xi;
2236
2237           xi = x;
2238
2239           while (xi < x + width)
2240             {
2241               gdk_cairo_set_source_rgba (cr, &lighter);
2242               add_path_line (cr, x, y, x, y + height);
2243               cairo_stroke (cr);
2244               xi++;
2245
2246               gdk_cairo_set_source_rgba (cr, &darker);
2247               add_path_line (cr, xi, y, xi, y + height);
2248               cairo_stroke (cr);
2249               xi += 2;
2250             }
2251         }
2252       else if (sides == GTK_JUNCTION_TOP ||
2253                sides == GTK_JUNCTION_BOTTOM)
2254         {
2255           gint yi;
2256
2257           yi = y;
2258
2259           while (yi < y + height)
2260             {
2261               gdk_cairo_set_source_rgba (cr, &lighter);
2262               add_path_line (cr, x, yi, x + width, yi);
2263               cairo_stroke (cr);
2264               yi++;
2265
2266               gdk_cairo_set_source_rgba (cr, &darker);
2267               add_path_line (cr, x, yi, x + width, yi);
2268               cairo_stroke (cr);
2269               yi += 2;
2270             }
2271         }
2272       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2273         {
2274           gint xi, yi;
2275
2276           xi = x + width;
2277           yi = y + height;
2278
2279           while (xi > x + 3)
2280             {
2281               gdk_cairo_set_source_rgba (cr, &darker);
2282               add_path_line (cr, xi, y, x, yi);
2283               cairo_stroke (cr);
2284
2285               --xi;
2286               --yi;
2287
2288               add_path_line (cr, xi, y, x, yi);
2289               cairo_stroke (cr);
2290
2291               --xi;
2292               --yi;
2293
2294               gdk_cairo_set_source_rgba (cr, &lighter);
2295               add_path_line (cr, xi, y, x, yi);
2296               cairo_stroke (cr);
2297
2298               xi -= 3;
2299               yi -= 3;
2300             }
2301         }
2302       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2303         {
2304           gint xi, yi;
2305
2306           xi = x;
2307           yi = y + height;
2308
2309           while (xi < (x + width - 3))
2310             {
2311               gdk_cairo_set_source_rgba (cr, &lighter);
2312               add_path_line (cr, xi, y, x + width, yi);
2313               cairo_stroke (cr);
2314
2315               ++xi;
2316               --yi;
2317
2318               gdk_cairo_set_source_rgba (cr, &darker);
2319               add_path_line (cr, xi, y, x + width, yi);
2320               cairo_stroke (cr);
2321
2322               ++xi;
2323               --yi;
2324
2325               add_path_line (cr, xi, y, x + width, yi);
2326               cairo_stroke (cr);
2327
2328               xi += 3;
2329               yi -= 3;
2330             }
2331         }
2332       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2333         {
2334           gint xi, yi;
2335
2336           xi = x + width;
2337           yi = y;
2338
2339           while (xi > x + 3)
2340             {
2341               gdk_cairo_set_source_rgba (cr, &darker);
2342               add_path_line (cr, x, yi, xi, y + height);
2343               cairo_stroke (cr);
2344
2345               --xi;
2346               ++yi;
2347
2348               add_path_line (cr, x, yi, xi, y + height);
2349               cairo_stroke (cr);
2350
2351               --xi;
2352               ++yi;
2353
2354               gdk_cairo_set_source_rgba (cr, &lighter);
2355               add_path_line (cr, x, yi, xi, y + height);
2356               cairo_stroke (cr);
2357
2358               xi -= 3;
2359               yi += 3;
2360             }
2361         }
2362       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2363         {
2364           gint xi, yi;
2365
2366           xi = x;
2367           yi = y;
2368
2369           while (xi < (x + width - 3))
2370             {
2371               gdk_cairo_set_source_rgba (cr, &lighter);
2372               add_path_line (cr, xi, y + height, x + width, yi);
2373               cairo_stroke (cr);
2374
2375               ++xi;
2376               ++yi;
2377
2378               gdk_cairo_set_source_rgba (cr, &darker);
2379               add_path_line (cr, xi, y + height, x + width, yi);
2380               cairo_stroke (cr);
2381
2382               ++xi;
2383               ++yi;
2384
2385               add_path_line (cr, xi, y + height, x + width, yi);
2386               cairo_stroke (cr);
2387
2388               xi += 3;
2389               yi += 3;
2390             }
2391         }
2392     }
2393   else if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_PANE_SEPARATOR))
2394     {
2395       if (width > height)
2396         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2397           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2398       else
2399         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2400           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2401     }
2402   else
2403     {
2404       for (yy = y; yy < y + height; yy += 3)
2405         for (xx = x; xx < x + width; xx += 6)
2406           {
2407             render_dot (cr, &lighter, &darker, xx, yy, 2);
2408             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2409           }
2410     }
2411
2412   cairo_restore (cr);
2413 }
2414
2415 void
2416 _gtk_theming_engine_paint_spinner (cairo_t *cr,
2417                                    gdouble  radius,
2418                                    gdouble  progress,
2419                                    GdkRGBA *color)
2420 {
2421   guint num_steps, step;
2422   gdouble half;
2423   gint i;
2424
2425   num_steps = 12;
2426
2427   if (progress >= 0)
2428     step = (guint) (progress * num_steps);
2429   else
2430     step = 0;
2431
2432   cairo_save (cr);
2433
2434   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2435   cairo_set_line_width (cr, 2.0);
2436
2437   half = num_steps / 2;
2438
2439   for (i = 0; i < num_steps; i++)
2440     {
2441       gint inset = 0.7 * radius;
2442
2443       /* transparency is a function of time and intial value */
2444       gdouble t = 1.0 - (gdouble) ((i + step) % num_steps) / num_steps;
2445       gdouble xscale = - sin (i * G_PI / half);
2446       gdouble yscale = - cos (i * G_PI / half);
2447
2448       cairo_set_source_rgba (cr,
2449                              color->red,
2450                              color->green,
2451                              color->blue,
2452                              color->alpha * t);
2453
2454       cairo_move_to (cr,
2455                      (radius - inset) * xscale,
2456                      (radius - inset) * yscale);
2457       cairo_line_to (cr,
2458                      radius * xscale,
2459                      radius * yscale);
2460
2461       cairo_stroke (cr);
2462     }
2463
2464   cairo_restore (cr);
2465 }
2466
2467 static void
2468 render_spinner (GtkThemingEngine *engine,
2469                 cairo_t          *cr,
2470                 gdouble           x,
2471                 gdouble           y,
2472                 gdouble           width,
2473                 gdouble           height)
2474 {
2475   GtkStateFlags state;
2476   GtkShadow *shadow;
2477   GdkRGBA color;
2478   gdouble progress;
2479   gdouble radius;
2480
2481   state = gtk_theming_engine_get_state (engine);
2482
2483   if (!gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
2484     progress = -1;
2485
2486   radius = MIN (width / 2, height / 2);
2487
2488   gtk_theming_engine_get_color (engine, state, &color);
2489   gtk_theming_engine_get (engine, state,
2490                           "icon-shadow", &shadow,
2491                           NULL);
2492
2493   cairo_save (cr);
2494   cairo_translate (cr, x + width / 2, y + height / 2);
2495
2496   if (shadow != NULL)
2497     {
2498       _gtk_icon_shadow_paint_spinner (shadow, cr,
2499                                       radius,
2500                                       progress);
2501       _gtk_shadow_unref (shadow);
2502     }
2503
2504   _gtk_theming_engine_paint_spinner (cr,
2505                                      radius,
2506                                      progress,
2507                                      &color);
2508
2509   cairo_restore (cr);
2510 }
2511
2512 static void
2513 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2514                                     cairo_t          *cr,
2515                                     gdouble           x,
2516                                     gdouble           y,
2517                                     gdouble           width,
2518                                     gdouble           height)
2519 {
2520   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
2521     {
2522       render_spinner (engine, cr, x, y, width, height);
2523     }
2524   else
2525     {
2526       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2527       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2528     }
2529 }
2530
2531 static GdkPixbuf *
2532 scale_or_ref (GdkPixbuf *src,
2533               gint       width,
2534               gint       height)
2535 {
2536   if (width == gdk_pixbuf_get_width (src) &&
2537       height == gdk_pixbuf_get_height (src))
2538     return g_object_ref (src);
2539   else
2540     return gdk_pixbuf_scale_simple (src,
2541                                     width, height,
2542                                     GDK_INTERP_BILINEAR);
2543 }
2544
2545 static gboolean
2546 lookup_icon_size (GtkThemingEngine *engine,
2547                   GtkIconSize       size,
2548                   gint             *width,
2549                   gint             *height)
2550 {
2551   GdkScreen *screen;
2552   GtkSettings *settings;
2553
2554   screen = gtk_theming_engine_get_screen (engine);
2555   settings = gtk_settings_get_for_screen (screen);
2556
2557   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
2558 }
2559
2560 static void
2561 colorshift_source (cairo_t *cr,
2562                    gdouble shift)
2563 {
2564   cairo_pattern_t *source;
2565
2566   cairo_save (cr);
2567   cairo_paint (cr);
2568
2569   source = cairo_pattern_reference (cairo_get_source (cr));
2570
2571   cairo_set_source_rgb (cr, shift, shift, shift);
2572   cairo_set_operator (cr, CAIRO_OPERATOR_COLOR_DODGE);
2573
2574   cairo_mask (cr, source);
2575
2576   cairo_pattern_destroy (source);
2577   cairo_restore (cr);
2578 }
2579
2580 static GdkPixbuf *
2581 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
2582                                        const GtkIconSource *source,
2583                                        GtkIconSize          size)
2584 {
2585   GdkPixbuf *scaled;
2586   GdkPixbuf *stated;
2587   GdkPixbuf *base_pixbuf;
2588   GtkStateFlags state;
2589   gint width = 1;
2590   gint height = 1;
2591   cairo_t *cr;
2592   cairo_surface_t *surface;
2593
2594   base_pixbuf = gtk_icon_source_get_pixbuf (source);
2595   state = gtk_theming_engine_get_state (engine);
2596
2597   g_return_val_if_fail (base_pixbuf != NULL, NULL);
2598
2599   if (size != (GtkIconSize) -1 &&
2600       !lookup_icon_size (engine, size, &width, &height))
2601     {
2602       g_warning (G_STRLOC ": invalid icon size '%d'", size);
2603       return NULL;
2604     }
2605
2606   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
2607    * leave it alone.
2608    */
2609   if (size != (GtkIconSize) -1 &&
2610       gtk_icon_source_get_size_wildcarded (source))
2611     scaled = scale_or_ref (base_pixbuf, width, height);
2612   else
2613     scaled = g_object_ref (base_pixbuf);
2614
2615   /* If the state was wildcarded, then generate a state. */
2616   if (gtk_icon_source_get_state_wildcarded (source))
2617     {
2618       if (state & GTK_STATE_FLAG_INSENSITIVE)
2619         {
2620           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2621                                                 gdk_pixbuf_get_width (scaled),
2622                                                 gdk_pixbuf_get_height (scaled));
2623           cr = cairo_create (surface);
2624           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2625           cairo_paint_with_alpha (cr, 0.5);
2626
2627           cairo_destroy (cr);
2628
2629           g_object_unref (scaled);
2630           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2631                                                 cairo_image_surface_get_width (surface),
2632                                                 cairo_image_surface_get_height (surface));
2633           cairo_surface_destroy (surface);
2634         }
2635       else if (state & GTK_STATE_FLAG_PRELIGHT)
2636         {
2637           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2638                                                 gdk_pixbuf_get_width (scaled),
2639                                                 gdk_pixbuf_get_height (scaled));
2640
2641           cr = cairo_create (surface);
2642           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2643           colorshift_source (cr, 0.10);
2644
2645           cairo_destroy (cr);
2646
2647           g_object_unref (scaled);
2648           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2649                                                 cairo_image_surface_get_width (surface),
2650                                                 cairo_image_surface_get_height (surface));
2651           cairo_surface_destroy (surface);
2652         }
2653       else
2654         stated = scaled;
2655     }
2656   else
2657     stated = scaled;
2658
2659   return stated;
2660 }
2661
2662 static void
2663 gtk_theming_engine_render_icon (GtkThemingEngine *engine,
2664                                 cairo_t *cr,
2665                                 GdkPixbuf *pixbuf,
2666                                 gdouble x,
2667                                 gdouble y)
2668 {
2669   GtkStateFlags state;
2670   GtkShadow *icon_shadow;
2671
2672   state = gtk_theming_engine_get_state (engine);
2673
2674   cairo_save (cr);
2675
2676   gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
2677
2678   gtk_theming_engine_get (engine, state,
2679                           "icon-shadow", &icon_shadow,
2680                           NULL);
2681
2682   if (icon_shadow != NULL)
2683     {
2684       _gtk_icon_shadow_paint (icon_shadow, cr);
2685       _gtk_shadow_unref (icon_shadow);
2686     }
2687
2688   cairo_paint (cr);
2689
2690   cairo_restore (cr);
2691 }
2692