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 "gtkborderimageprivate.h"
  31 #include "gtkpango.h"
  32 #include "gtkshadowprivate.h"
  33 #include "gtkcsstypesprivate.h"
  34 #include "gtkthemingengineprivate.h"
  35 #include "gtkroundedboxprivate.h"
  36
  37 /**
  38  * SECTION:gtkthemingengine
  39  * @Short_description: Theming renderers
  40  * @Title: GtkThemingEngine
  41  * @See_also: #GtkStyleContext
  42  *
  43  * #GtkThemingEngine is the object used for rendering themed content
  44  * in GTK+ widgets. Even though GTK+ has a default implementation,
  45  * it can be overridden in CSS files by enforcing a #GtkThemingEngine
  46  * object to be loaded as a module.
  47  *
  48  * In order to implement a theming engine, a #GtkThemingEngine subclass
  49  * must be created, alongside the CSS file that will reference it, the
  50  * theming engine would be created as an .so library, and installed in
  51  * $(gtk-modules-dir)/theming-engines/.
  52  *
  53  * #GtkThemingEngine<!-- -->s have limited access to the object they are
  54  * rendering, the #GtkThemingEngine API has read-only accessors to the
  55  * style information contained in the rendered object's #GtkStyleContext.
  56  */
  57
  58 typedef struct GtkThemingEnginePrivate GtkThemingEnginePrivate;
  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 /**
 342  * gtk_theming_engine_register_property: (skip)
 343  * @name_space: namespace for the property name
 344  * @parse_func: parsing function to use, or %NULL
 345  * @pspec: the #GParamSpec for the new property
 346  *
 347  * Registers a property so it can be used in the CSS file format,
 348  * on the CSS file the property will look like
 349  * "-${@name_space}-${property_name}". being
 350  * ${property_name} the given to @pspec. @name_space will usually
 351  * be the theme engine name.
 352  *
 353  * For any type a @parse_func may be provided, being this function
 354  * used for turning any property value (between ':' and ';') in
 355  * CSS to the #GValue needed. For basic types there is already
 356  * builtin parsing support, so %NULL may be provided for these
 357  * cases.
 358  *
 359  * <note>
 360  * Engines must ensure property registration happens exactly once,
 361  * usually GTK+ deals with theming engines as singletons, so this
 362  * should be guaranteed to happen once, but bear this in mind
 363  * when creating #GtkThemeEngine<!-- -->s yourself.
 364  * </note>
 365  *
 366  * <note>
 367  * In order to make use of the custom registered properties in
 368  * the CSS file, make sure the engine is loaded first by specifying
 369  * the engine property, either in a previous rule or within the same
 370  * one.
 371  * <programlisting>
 372  * &ast; {
 373  *     engine: someengine;
 374  *     -SomeEngine-custom-property: 2;
 375  * }
 376  * </programlisting>
 377  * </note>
 378  *
 379  * Since: 3.0
 380  **/
 381 void
 382 gtk_theming_engine_register_property (const gchar            *name_space,
 383                                       GtkStylePropertyParser  parse_func,
 384                                       GParamSpec             *pspec)
 385 {
 386   gchar *name;
 387
 388   g_return_if_fail (name_space != NULL);
 389   g_return_if_fail (strchr (name_space, ' ') == NULL);
 390   g_return_if_fail (G_IS_PARAM_SPEC (pspec));
 391
 392   /* FIXME: hack hack hack, replacing pspec->name to include namespace */
 393   name = g_strdup_printf ("-%s-%s", name_space, pspec->name);
 394   g_free (pspec->name);
 395   pspec->name = name;
 396
 397   gtk_style_properties_register_property (parse_func, pspec);
 398 }
 399
 400 /**
 401  * gtk_theming_engine_get_property:
 402  * @engine: a #GtkThemingEngine
 403  * @property: the property name
 404  * @state: state to retrieve the value for
 405  * @value: (out) (transfer full): return location for the property value,
 406  *         you must free this memory using g_value_unset() once you are
 407  *         done with it.
 408  *
 409  * Gets a property value as retrieved from the style settings that apply
 410  * to the currently rendered element.
 411  *
 412  * Since: 3.0
 413  **/
 414 void
 415 gtk_theming_engine_get_property (GtkThemingEngine *engine,
 416                                  const gchar      *property,
 417                                  GtkStateFlags     state,
 418                                  GValue           *value)
 419 {
 420   GtkThemingEnginePrivate *priv;
 421
 422   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 423   g_return_if_fail (property != NULL);
 424   g_return_if_fail (value != NULL);
 425
 426   priv = engine->priv;
 427   gtk_style_context_get_property (priv->context, property, state, value);
 428 }
 429
 430 /**
 431  * gtk_theming_engine_get_valist:
 432  * @engine: a #GtkThemingEngine
 433  * @state: state to retrieve values for
 434  * @args: va_list of property name/return location pairs, followed by %NULL
 435  *
 436  * Retrieves several style property values that apply to the currently
 437  * rendered element.
 438  *
 439  * Since: 3.0
 440  **/
 441 void
 442 gtk_theming_engine_get_valist (GtkThemingEngine *engine,
 443                                GtkStateFlags     state,
 444                                va_list           args)
 445 {
 446   GtkThemingEnginePrivate *priv;
 447
 448   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 449
 450   priv = engine->priv;
 451   gtk_style_context_get_valist (priv->context, state, args);
 452 }
 453
 454 /**
 455  * gtk_theming_engine_get:
 456  * @engine: a #GtkThemingEngine
 457  * @state: state to retrieve values for
 458  * @...: property name /return value pairs, followed by %NULL
 459  *
 460  * Retrieves several style property values that apply to the currently
 461  * rendered element.
 462  *
 463  * Since: 3.0
 464  **/
 465 void
 466 gtk_theming_engine_get (GtkThemingEngine *engine,
 467                         GtkStateFlags     state,
 468                         ...)
 469 {
 470   GtkThemingEnginePrivate *priv;
 471   va_list args;
 472
 473   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 474
 475   priv = engine->priv;
 476
 477   va_start (args, state);
 478   gtk_style_context_get_valist (priv->context, state, args);
 479   va_end (args);
 480 }
 481
 482 /**
 483  * gtk_theming_engine_get_style_property:
 484  * @engine: a #GtkThemingEngine
 485  * @property_name: the name of the widget style property
 486  * @value: Return location for the property value, free with
 487  *         g_value_unset() after use.
 488  *
 489  * Gets the value for a widget style property.
 490  *
 491  * Since: 3.0
 492  **/
 493 void
 494 gtk_theming_engine_get_style_property (GtkThemingEngine *engine,
 495                                        const gchar      *property_name,
 496                                        GValue           *value)
 497 {
 498   GtkThemingEnginePrivate *priv;
 499
 500   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 501   g_return_if_fail (property_name != NULL);
 502
 503   priv = engine->priv;
 504   gtk_style_context_get_style_property (priv->context, property_name, value);
 505 }
 506
 507 /**
 508  * gtk_theming_engine_get_style_valist:
 509  * @engine: a #GtkThemingEngine
 510  * @args: va_list of property name/return location pairs, followed by %NULL
 511  *
 512  * Retrieves several widget style properties from @engine according to the
 513  * currently rendered content's style.
 514  *
 515  * Since: 3.0
 516  **/
 517 void
 518 gtk_theming_engine_get_style_valist (GtkThemingEngine *engine,
 519                                      va_list           args)
 520 {
 521   GtkThemingEnginePrivate *priv;
 522
 523   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 524
 525   priv = engine->priv;
 526   gtk_style_context_get_style_valist (priv->context, args);
 527 }
 528
 529 /**
 530  * gtk_theming_engine_get_style:
 531  * @engine: a #GtkThemingEngine
 532  * @...: property name /return value pairs, followed by %NULL
 533  *
 534  * Retrieves several widget style properties from @engine according
 535  * to the currently rendered content's style.
 536  *
 537  * Since: 3.0
 538  **/
 539 void
 540 gtk_theming_engine_get_style (GtkThemingEngine *engine,
 541                               ...)
 542 {
 543   GtkThemingEnginePrivate *priv;
 544   va_list args;
 545
 546   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 547
 548   priv = engine->priv;
 549
 550   va_start (args, engine);
 551   gtk_style_context_get_style_valist (priv->context, args);
 552   va_end (args);
 553 }
 554
 555 /**
 556  * gtk_theming_engine_lookup_color:
 557  * @engine: a #GtkThemingEngine
 558  * @color_name: color name to lookup
 559  * @color: (out): Return location for the looked up color
 560  *
 561  * Looks up and resolves a color name in the current style's color map.
 562  *
 563  * Returns: %TRUE if @color_name was found and resolved, %FALSE otherwise
 564  **/
 565 gboolean
 566 gtk_theming_engine_lookup_color (GtkThemingEngine *engine,
 567                                  const gchar      *color_name,
 568                                  GdkRGBA          *color)
 569 {
 570   GtkThemingEnginePrivate *priv;
 571
 572   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 573   g_return_val_if_fail (color_name != NULL, FALSE);
 574
 575   priv = engine->priv;
 576   return gtk_style_context_lookup_color (priv->context, color_name, color);
 577 }
 578
 579 /**
 580  * gtk_theming_engine_get_state:
 581  * @engine: a #GtkThemingEngine
 582  *
 583  * returns the state used when rendering.
 584  *
 585  * Returns: the state flags
 586  *
 587  * Since: 3.0
 588  **/
 589 GtkStateFlags
 590 gtk_theming_engine_get_state (GtkThemingEngine *engine)
 591 {
 592   GtkThemingEnginePrivate *priv;
 593
 594   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 595
 596   priv = engine->priv;
 597   return gtk_style_context_get_state (priv->context);
 598 }
 599
 600 /**
 601  * gtk_theming_engine_state_is_running:
 602  * @engine: a #GtkThemingEngine
 603  * @state: a widget state
 604  * @progress: (out): return location for the transition progress
 605  *
 606  * Returns %TRUE if there is a transition animation running for the
 607  * current region (see gtk_style_context_push_animatable_region()).
 608  *
 609  * If @progress is not %NULL, the animation progress will be returned
 610  * there, 0.0 means the state is closest to being %FALSE, while 1.0 means
 611  * it's closest to being %TRUE. This means transition animations will
 612  * run from 0 to 1 when @state is being set to %TRUE and from 1 to 0 when
 613  * it's being set to %FALSE.
 614  *
 615  * Returns: %TRUE if there is a running transition animation for @state.
 616  *
 617  * Since: 3.0
 618  **/
 619 gboolean
 620 gtk_theming_engine_state_is_running (GtkThemingEngine *engine,
 621                                      GtkStateType      state,
 622                                      gdouble          *progress)
 623 {
 624   GtkThemingEnginePrivate *priv;
 625
 626   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 627
 628   priv = engine->priv;
 629   return gtk_style_context_state_is_running (priv->context, state, progress);
 630 }
 631
 632 /**
 633  * gtk_theming_engine_get_path:
 634  * @engine: a #GtkThemingEngine
 635  *
 636  * Returns the widget path used for style matching.
 637  *
 638  * Returns: (transfer none): A #GtkWidgetPath
 639  *
 640  * Since: 3.0
 641  **/
 642 const GtkWidgetPath *
 643 gtk_theming_engine_get_path (GtkThemingEngine *engine)
 644 {
 645   GtkThemingEnginePrivate *priv;
 646
 647   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 648
 649   priv = engine->priv;
 650   return gtk_style_context_get_path (priv->context);
 651 }
 652
 653 /**
 654  * gtk_theming_engine_has_class:
 655  * @engine: a #GtkThemingEngine
 656  * @style_class: class name to look up
 657  *
 658  * Returns %TRUE if the currently rendered contents have
 659  * defined the given class name.
 660  *
 661  * Returns: %TRUE if @engine has @class_name defined
 662  *
 663  * Since: 3.0
 664  **/
 665 gboolean
 666 gtk_theming_engine_has_class (GtkThemingEngine *engine,
 667                               const gchar      *style_class)
 668 {
 669   GtkThemingEnginePrivate *priv;
 670
 671   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 672
 673   priv = engine->priv;
 674   return gtk_style_context_has_class (priv->context, style_class);
 675 }
 676
 677 /**
 678  * gtk_theming_engine_has_region:
 679  * @engine: a #GtkThemingEngine
 680  * @style_region: a region name
 681  * @flags: (out) (allow-none): return location for region flags
 682  *
 683  * Returns %TRUE if the currently rendered contents have the
 684  * region defined. If @flags_return is not %NULL, it is set
 685  * to the flags affecting the region.
 686  *
 687  * Returns: %TRUE if region is defined
 688  *
 689  * Since: 3.0
 690  **/
 691 gboolean
 692 gtk_theming_engine_has_region (GtkThemingEngine *engine,
 693                                const gchar      *style_region,
 694                                GtkRegionFlags   *flags)
 695 {
 696   GtkThemingEnginePrivate *priv;
 697
 698   if (flags)
 699     *flags = 0;
 700
 701   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 702
 703   priv = engine->priv;
 704   return gtk_style_context_has_region (priv->context, style_region, flags);
 705 }
 706
 707 /**
 708  * gtk_theming_engine_get_direction:
 709  * @engine: a #GtkThemingEngine
 710  *
 711  * Returns the widget direction used for rendering.
 712  *
 713  * Returns: the widget direction
 714  *
 715  * Since: 3.0
 716  **/
 717 GtkTextDirection
 718 gtk_theming_engine_get_direction (GtkThemingEngine *engine)
 719 {
 720   GtkThemingEnginePrivate *priv;
 721
 722   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), GTK_TEXT_DIR_LTR);
 723
 724   priv = engine->priv;
 725   return gtk_style_context_get_direction (priv->context);
 726 }
 727
 728 /**
 729  * gtk_theming_engine_get_junction_sides:
 730  * @engine: a #GtkThemingEngine
 731  *
 732  * Returns the widget direction used for rendering.
 733  *
 734  * Returns: the widget direction
 735  *
 736  * Since: 3.0
 737  **/
 738 GtkJunctionSides
 739 gtk_theming_engine_get_junction_sides (GtkThemingEngine *engine)
 740 {
 741   GtkThemingEnginePrivate *priv;
 742
 743   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 744
 745   priv = engine->priv;
 746   return gtk_style_context_get_junction_sides (priv->context);
 747 }
 748
 749 /**
 750  * gtk_theming_engine_get_color:
 751  * @engine: a #GtkThemingEngine
 752  * @state: state to retrieve the color for
 753  * @color: (out): return value for the foreground color
 754  *
 755  * Gets the foreground color for a given state.
 756  *
 757  * Since: 3.0
 758  **/
 759 void
 760 gtk_theming_engine_get_color (GtkThemingEngine *engine,
 761                               GtkStateFlags     state,
 762                               GdkRGBA          *color)
 763 {
 764   GtkThemingEnginePrivate *priv;
 765
 766   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 767
 768   priv = engine->priv;
 769   gtk_style_context_get_color (priv->context, state, color);
 770 }
 771
 772 /**
 773  * gtk_theming_engine_get_background_color:
 774  * @engine: a #GtkThemingEngine
 775  * @state: state to retrieve the color for
 776  * @color: (out): return value for the background color
 777  *
 778  * Gets the background color for a given state.
 779  *
 780  * Since: 3.0
 781  **/
 782 void
 783 gtk_theming_engine_get_background_color (GtkThemingEngine *engine,
 784                                          GtkStateFlags     state,
 785                                          GdkRGBA          *color)
 786 {
 787   GtkThemingEnginePrivate *priv;
 788
 789   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 790
 791   priv = engine->priv;
 792   gtk_style_context_get_background_color (priv->context, state, color);
 793 }
 794
 795 /**
 796  * gtk_theming_engine_get_border_color:
 797  * @engine: a #GtkThemingEngine
 798  * @state: state to retrieve the color for
 799  * @color: (out): return value for the border color
 800  *
 801  * Gets the border color for a given state.
 802  *
 803  * Since: 3.0
 804  **/
 805 void
 806 gtk_theming_engine_get_border_color (GtkThemingEngine *engine,
 807                                      GtkStateFlags     state,
 808                                      GdkRGBA          *color)
 809 {
 810   GtkThemingEnginePrivate *priv;
 811
 812   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 813
 814   priv = engine->priv;
 815   gtk_style_context_get_border_color (priv->context, state, color);
 816 }
 817
 818 /**
 819  * gtk_theming_engine_get_border:
 820  * @engine: a #GtkthemingEngine
 821  * @state: state to retrieve the border for
 822  * @border: (out): return value for the border settings
 823  *
 824  * Gets the border for a given state as a #GtkBorder.
 825  *
 826  * Since: 3.0
 827  **/
 828 void
 829 gtk_theming_engine_get_border (GtkThemingEngine *engine,
 830                                GtkStateFlags     state,
 831                                GtkBorder        *border)
 832 {
 833   GtkThemingEnginePrivate *priv;
 834
 835   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 836
 837   priv = engine->priv;
 838   gtk_style_context_get_border (priv->context, state, border);
 839 }
 840
 841 /**
 842  * gtk_theming_engine_get_padding:
 843  * @engine: a #GtkthemingEngine
 844  * @state: state to retrieve the padding for
 845  * @padding: (out): return value for the padding settings
 846  *
 847  * Gets the padding for a given state as a #GtkBorder.
 848  *
 849  * Since: 3.0
 850  **/
 851 void
 852 gtk_theming_engine_get_padding (GtkThemingEngine *engine,
 853                                 GtkStateFlags     state,
 854                                 GtkBorder        *padding)
 855 {
 856   GtkThemingEnginePrivate *priv;
 857
 858   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 859
 860   priv = engine->priv;
 861   gtk_style_context_get_padding (priv->context, state, padding);
 862 }
 863
 864 /**
 865  * gtk_theming_engine_get_margin:
 866  * @engine: a #GtkThemingEngine
 867  * @state: state to retrieve the border for
 868  * @margin: (out): return value for the margin settings
 869  *
 870  * Gets the margin for a given state as a #GtkBorder.
 871  *
 872  * Since: 3.0
 873  **/
 874 void
 875 gtk_theming_engine_get_margin (GtkThemingEngine *engine,
 876                                GtkStateFlags     state,
 877                                GtkBorder        *margin)
 878 {
 879   GtkThemingEnginePrivate *priv;
 880
 881   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 882
 883   priv = engine->priv;
 884   gtk_style_context_get_margin (priv->context, state, margin);
 885 }
 886
 887 /**
 888  * gtk_theming_engine_get_font:
 889  * @engine: a #GtkThemingEngine
 890  * @state: state to retrieve the font for
 891  *
 892  * Returns the font description for a given state.
 893  *
 894  * Returns: (transfer none): the #PangoFontDescription for the given
 895  *          state. This object is owned by GTK+ and should not be
 896  *          freed.
 897  *
 898  * Since: 3.0
 899  **/
 900 const PangoFontDescription *
 901 gtk_theming_engine_get_font (GtkThemingEngine *engine,
 902                              GtkStateFlags     state)
 903 {
 904   GtkThemingEnginePrivate *priv;
 905
 906   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 907
 908   priv = engine->priv;
 909   return gtk_style_context_get_font (priv->context, state);
 910 }
 911
 912 /* GtkThemingModule */
 913
 914 static gboolean
 915 gtk_theming_module_load (GTypeModule *type_module)
 916 {
 917   GtkThemingModule *theming_module;
 918   GModule *module;
 919   gchar *name, *module_path;
 920
 921   theming_module = GTK_THEMING_MODULE (type_module);
 922   name = theming_module->name;
 923   module_path = _gtk_find_module (name, "theming-engines");
 924
 925   if (!module_path)
 926     return FALSE;
 927
 928   module = g_module_open (module_path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 929   g_free (module_path);
 930
 931   if (!module)
 932     return FALSE;
 933
 934   if (!g_module_symbol (module, "theme_init",
 935                         (gpointer *) &theming_module->init) ||
 936       !g_module_symbol (module, "theme_exit",
 937                         (gpointer *) &theming_module->exit) ||
 938       !g_module_symbol (module, "create_engine",
 939                         (gpointer *) &theming_module->create_engine))
 940     {
 941       g_module_close (module);
 942
 943       return FALSE;
 944     }
 945
 946   theming_module->module = module;
 947
 948   theming_module->init (G_TYPE_MODULE (theming_module));
 949
 950   return TRUE;
 951 }
 952
 953 static void
 954 gtk_theming_module_unload (GTypeModule *type_module)
 955 {
 956   GtkThemingModule *theming_module;
 957
 958   theming_module = GTK_THEMING_MODULE (type_module);
 959
 960   theming_module->exit ();
 961
 962   g_module_close (theming_module->module);
 963
 964   theming_module->module = NULL;
 965   theming_module->init = NULL;
 966   theming_module->exit = NULL;
 967   theming_module->create_engine = NULL;
 968 }
 969
 970 static void
 971 gtk_theming_module_class_init (GtkThemingModuleClass *klass)
 972 {
 973   GTypeModuleClass *module_class = G_TYPE_MODULE_CLASS (klass);
 974
 975   module_class->load = gtk_theming_module_load;
 976   module_class->unload = gtk_theming_module_unload;
 977 }
 978
 979 static void
 980 gtk_theming_module_init (GtkThemingModule *module)
 981 {
 982 }
 983
 984 /**
 985  * gtk_theming_engine_load:
 986  * @name: Theme engine name to load
 987  *
 988  * Loads and initializes a theming engine module from the
 989  * standard directories.
 990  *
 991  * Returns: (transfer none): A theming engine, or %NULL if
 992  * the engine @name doesn't exist.
 993  **/
 994 GtkThemingEngine *
 995 gtk_theming_engine_load (const gchar *name)
 996 {
 997   static GHashTable *engines = NULL;
 998   static GtkThemingEngine *default_engine;
 999   GtkThemingEngine *engine = NULL;
1000
1001   if (name)
1002     {
1003       if (!engines)
1004         engines = g_hash_table_new (g_str_hash, g_str_equal);
1005
1006       engine = g_hash_table_lookup (engines, name);
1007
1008       if (!engine)
1009         {
1010           GtkThemingModule *module;
1011
1012           module = g_object_new (GTK_TYPE_THEMING_MODULE, NULL);
1013           g_type_module_set_name (G_TYPE_MODULE (module), name);
1014           module->name = g_strdup (name);
1015
1016           if (module && g_type_module_use (G_TYPE_MODULE (module)))
1017             {
1018               engine = (module->create_engine) ();
1019
1020               if (engine)
1021                 g_hash_table_insert (engines, module->name, engine);
1022             }
1023         }
1024     }
1025
1026   if (!engine)
1027     {
1028       if (G_UNLIKELY (!default_engine))
1029         default_engine = g_object_new (GTK_TYPE_THEMING_ENGINE, NULL);
1030
1031       engine = default_engine;
1032     }
1033
1034   return engine;
1035 }
1036
1037 /**
1038  * gtk_theming_engine_get_screen:
1039  * @engine: a #GtkThemingEngine
1040  *
1041  * Returns the #GdkScreen to which @engine currently rendering to.
1042  *
1043  * Returns: (transfer none): a #GdkScreen, or %NULL.
1044  **/
1045 GdkScreen *
1046 gtk_theming_engine_get_screen (GtkThemingEngine *engine)
1047 {
1048   GtkThemingEnginePrivate *priv;
1049
1050   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
1051
1052   priv = engine->priv;
1053   return gtk_style_context_get_screen (priv->context);
1054 }
1055
1056 /* Paint method implementations */
1057 static void
1058 gtk_theming_engine_render_check (GtkThemingEngine *engine,
1059                                  cairo_t          *cr,
1060                                  gdouble           x,
1061                                  gdouble           y,
1062                                  gdouble           width,
1063                                  gdouble           height)
1064 {
1065   GdkRGBA fg_color, bg_color;
1066   GtkStateFlags flags;
1067   gint exterior_size, interior_size, thickness, pad;
1068   GtkBorderStyle border_style;
1069   GtkBorder border;
1070   gint border_width;
1071
1072   flags = gtk_theming_engine_get_state (engine);
1073   cairo_save (cr);
1074
1075   gtk_theming_engine_get_color (engine, flags, &fg_color);
1076   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1077   gtk_theming_engine_get_border (engine, flags, &border);
1078
1079   gtk_theming_engine_get (engine, flags,
1080                           "border-style", &border_style,
1081                           NULL);
1082
1083   border_width = MIN (MIN (border.top, border.bottom),
1084                       MIN (border.left, border.right));
1085   exterior_size = MIN (width, height);
1086
1087   if (exterior_size % 2 == 0) /* Ensure odd */
1088     exterior_size -= 1;
1089
1090   /* FIXME: thickness */
1091   thickness = 1;
1092   pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1093   interior_size = MAX (1, exterior_size - 2 * pad);
1094
1095   if (interior_size < 7)
1096     {
1097       interior_size = 7;
1098       pad = MAX (0, (exterior_size - interior_size) / 2);
1099     }
1100
1101   x -= (1 + exterior_size - (gint) width) / 2;
1102   y -= (1 + exterior_size - (gint) height) / 2;
1103
1104   if (border_style == GTK_BORDER_STYLE_SOLID)
1105     {
1106       GdkRGBA border_color;
1107
1108       cairo_set_line_width (cr, border_width);
1109       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1110
1111       cairo_rectangle (cr, x + 0.5, y + 0.5, exterior_size - 1, exterior_size - 1);
1112       gdk_cairo_set_source_rgba (cr, &bg_color);
1113       cairo_fill_preserve (cr);
1114
1115       gdk_cairo_set_source_rgba (cr, &border_color);
1116       cairo_stroke (cr);
1117     }
1118
1119   gdk_cairo_set_source_rgba (cr, &fg_color);
1120
1121   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1122     {
1123       int line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1124
1125       cairo_rectangle (cr,
1126                        x + pad,
1127                        y + pad + (1 + interior_size - line_thickness) / 2,
1128                        interior_size,
1129                        line_thickness);
1130       cairo_fill (cr);
1131     }
1132   else
1133     {
1134       gdouble progress;
1135       gboolean running;
1136
1137       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1138
1139       if ((flags & GTK_STATE_FLAG_ACTIVE) || running)
1140         {
1141           if (!running)
1142             progress = 1;
1143
1144           cairo_translate (cr,
1145                            x + pad, y + pad);
1146
1147           cairo_scale (cr, interior_size / 7., interior_size / 7.);
1148
1149           cairo_rectangle (cr, 0, 0, 7 * progress, 7);
1150           cairo_clip (cr);
1151
1152           cairo_move_to  (cr, 7.0, 0.0);
1153           cairo_line_to  (cr, 7.5, 1.0);
1154           cairo_curve_to (cr, 5.3, 2.0,
1155                           4.3, 4.0,
1156                           3.5, 7.0);
1157           cairo_curve_to (cr, 3.0, 5.7,
1158                           1.3, 4.7,
1159                           0.0, 4.7);
1160           cairo_line_to  (cr, 0.2, 3.5);
1161           cairo_curve_to (cr, 1.1, 3.5,
1162                           2.3, 4.3,
1163                           3.0, 5.0);
1164           cairo_curve_to (cr, 1.0, 3.9,
1165                           2.4, 4.1,
1166                           3.2, 4.9);
1167           cairo_curve_to (cr, 3.5, 3.1,
1168                           5.2, 2.0,
1169                           7.0, 0.0);
1170
1171           cairo_fill (cr);
1172         }
1173     }
1174
1175   cairo_restore (cr);
1176 }
1177
1178 static void
1179 gtk_theming_engine_render_option (GtkThemingEngine *engine,
1180                                   cairo_t          *cr,
1181                                   gdouble           x,
1182                                   gdouble           y,
1183                                   gdouble           width,
1184                                   gdouble           height)
1185 {
1186   GtkStateFlags flags;
1187   GdkRGBA fg_color, bg_color;
1188   gint exterior_size, interior_size, pad, thickness, border_width;
1189   GtkBorderStyle border_style;
1190   GtkBorder border;
1191
1192   flags = gtk_theming_engine_get_state (engine);
1193
1194   cairo_save (cr);
1195
1196   gtk_theming_engine_get_color (engine, flags, &fg_color);
1197   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1198   gtk_theming_engine_get_border (engine, flags, &border);
1199
1200   gtk_theming_engine_get (engine, flags,
1201                           "border-style", &border_style,
1202                           NULL);
1203
1204   exterior_size = MIN (width, height);
1205   border_width = MIN (MIN (border.top, border.bottom),
1206                       MIN (border.left, border.right));
1207
1208   if (exterior_size % 2 == 0) /* Ensure odd */
1209     exterior_size -= 1;
1210
1211   x -= (1 + exterior_size - width) / 2;
1212   y -= (1 + exterior_size - height) / 2;
1213
1214   if (border_style == GTK_BORDER_STYLE_SOLID)
1215     {
1216       GdkRGBA border_color;
1217
1218       cairo_set_line_width (cr, border_width);
1219       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1220
1221       cairo_new_sub_path (cr);
1222       cairo_arc (cr,
1223                  x + exterior_size / 2.,
1224                  y + exterior_size / 2.,
1225                  (exterior_size - 1) / 2.,
1226                  0, 2 * G_PI);
1227
1228       gdk_cairo_set_source_rgba (cr, &bg_color);
1229       cairo_fill_preserve (cr);
1230
1231       gdk_cairo_set_source_rgba (cr, &border_color);
1232       cairo_stroke (cr);
1233     }
1234
1235   gdk_cairo_set_source_rgba (cr, &fg_color);
1236
1237   /* FIXME: thickness */
1238   thickness = 1;
1239
1240   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1241     {
1242       gint line_thickness;
1243
1244       pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1245       interior_size = MAX (1, exterior_size - 2 * pad);
1246
1247       if (interior_size < 7)
1248         {
1249           interior_size = 7;
1250           pad = MAX (0, (exterior_size - interior_size) / 2);
1251         }
1252
1253       line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1254
1255       cairo_rectangle (cr,
1256                        x + pad,
1257                        y + pad + (interior_size - line_thickness) / 2.,
1258                        interior_size,
1259                        line_thickness);
1260       cairo_fill (cr);
1261     }
1262   if (flags & GTK_STATE_FLAG_ACTIVE)
1263     {
1264       pad = thickness + MAX (1, 2 * (exterior_size - 2 * thickness) / 9);
1265       interior_size = MAX (1, exterior_size - 2 * pad);
1266
1267       if (interior_size < 5)
1268         {
1269           interior_size = 7;
1270           pad = MAX (0, (exterior_size - interior_size) / 2);
1271         }
1272
1273       cairo_new_sub_path (cr);
1274       cairo_arc (cr,
1275                  x + pad + interior_size / 2.,
1276                  y + pad + interior_size / 2.,
1277                  interior_size / 2.,
1278                  0, 2 * G_PI);
1279       cairo_fill (cr);
1280     }
1281
1282   cairo_restore (cr);
1283 }
1284
1285 static void
1286 add_path_arrow (cairo_t *cr,
1287                 gdouble  angle,
1288                 gdouble  x,
1289                 gdouble  y,
1290                 gdouble  size)
1291 {
1292   cairo_save (cr);
1293
1294   cairo_translate (cr, x + (size / 2), y + (size / 2));
1295   cairo_rotate (cr, angle);
1296
1297   cairo_move_to (cr, 0, - (size / 4));
1298   cairo_line_to (cr, - (size / 2), (size / 4));
1299   cairo_line_to (cr, (size / 2), (size / 4));
1300   cairo_close_path (cr);
1301
1302   cairo_restore (cr);
1303 }
1304
1305 static void
1306 gtk_theming_engine_render_arrow (GtkThemingEngine *engine,
1307                                  cairo_t          *cr,
1308                                  gdouble           angle,
1309                                  gdouble           x,
1310                                  gdouble           y,
1311                                  gdouble           size)
1312 {
1313   GtkStateFlags flags;
1314   GdkRGBA fg_color;
1315
1316   cairo_save (cr);
1317
1318   flags = gtk_theming_engine_get_state (engine);
1319   gtk_theming_engine_get_color (engine, flags, &fg_color);
1320
1321   if (flags & GTK_STATE_FLAG_INSENSITIVE)
1322     {
1323       add_path_arrow (cr, angle, x + 1, y + 1, size);
1324       cairo_set_source_rgb (cr, 1, 1, 1);
1325       cairo_fill (cr);
1326     }
1327
1328   add_path_arrow (cr, angle, x, y, size);
1329   gdk_cairo_set_source_rgba (cr, &fg_color);
1330   cairo_fill (cr);
1331
1332   cairo_restore (cr);
1333 }
1334
1335 static void
1336 add_path_line (cairo_t        *cr,
1337                gdouble         x1,
1338                gdouble         y1,
1339                gdouble         x2,
1340                gdouble         y2)
1341 {
1342   /* Adjust endpoints */
1343   if (y1 == y2)
1344     {
1345       y1 += 0.5;
1346       y2 += 0.5;
1347       x2 += 1;
1348     }
1349   else if (x1 == x2)
1350     {
1351       x1 += 0.5;
1352       x2 += 0.5;
1353       y2 += 1;
1354     }
1355
1356   cairo_move_to (cr, x1, y1);
1357   cairo_line_to (cr, x2, y2);
1358 }
1359
1360 static void
1361 color_shade (const GdkRGBA *color,
1362              gdouble        factor,
1363              GdkRGBA       *color_return)
1364 {
1365   GtkSymbolicColor *literal, *shade;
1366
1367   literal = gtk_symbolic_color_new_literal (color);
1368   shade = gtk_symbolic_color_new_shade (literal, factor);
1369   gtk_symbolic_color_unref (literal);
1370
1371   gtk_symbolic_color_resolve (shade, NULL, color_return);
1372   gtk_symbolic_color_unref (shade);
1373 }
1374
1375 static void
1376 render_background_internal (GtkThemingEngine *engine,
1377                             cairo_t          *cr,
1378                             gdouble           x,
1379                             gdouble           y,
1380                             gdouble           width,
1381                             gdouble           height,
1382                             GtkJunctionSides  junction)
1383 {
1384   GdkRGBA bg_color;
1385   cairo_pattern_t *pattern;
1386   GtkStateFlags flags;
1387   gboolean running;
1388   gdouble progress;
1389   GtkRoundedBox border_box;
1390   GtkShadow *box_shadow;
1391
1392   flags = gtk_theming_engine_get_state (engine);
1393
1394   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1395
1396   gtk_theming_engine_get (engine, flags,
1397                           "background-image", &pattern,
1398                           "box-shadow", &box_shadow,
1399                           NULL);
1400
1401   cairo_save (cr);
1402   cairo_translate (cr, x, y);
1403
1404   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1405
1406   if (gtk_theming_engine_has_class (engine, "background"))
1407     {
1408       cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0); /* transparent */
1409       cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
1410       cairo_paint (cr);
1411     }
1412
1413   if (running)
1414     {
1415       cairo_pattern_t *other_pattern;
1416       GtkStateFlags other_flags;
1417       GdkRGBA other_bg;
1418       cairo_pattern_t *new_pattern = NULL;
1419
1420       if (flags & GTK_STATE_FLAG_PRELIGHT)
1421         {
1422           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
1423           progress = 1 - progress;
1424         }
1425       else
1426         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
1427
1428       gtk_theming_engine_get_background_color (engine, other_flags, &other_bg);
1429       gtk_theming_engine_get (engine, other_flags,
1430                               "background-image", &other_pattern,
1431                               NULL);
1432
1433       if (pattern && other_pattern)
1434         {
1435           cairo_pattern_type_t type, other_type;
1436           gint n0, n1;
1437
1438           cairo_pattern_get_color_stop_count (pattern, &n0);
1439           cairo_pattern_get_color_stop_count (other_pattern, &n1);
1440           type = cairo_pattern_get_type (pattern);
1441           other_type = cairo_pattern_get_type (other_pattern);
1442
1443           if (type == other_type && n0 == n1)
1444             {
1445               gdouble offset0, red0, green0, blue0, alpha0;
1446               gdouble offset1, red1, green1, blue1, alpha1;
1447               gdouble x00, x01, y00, y01, x10, x11, y10, y11;
1448               gdouble r00, r01, r10, r11;
1449               guint i;
1450
1451               if (type == CAIRO_PATTERN_TYPE_LINEAR)
1452                 {
1453                   cairo_pattern_get_linear_points (pattern, &x00, &y00, &x01, &y01);
1454                   cairo_pattern_get_linear_points (other_pattern, &x10, &y10, &x11, &y11);
1455
1456                   new_pattern = cairo_pattern_create_linear (x00 + (x10 - x00) * progress,
1457                                                              y00 + (y10 - y00) * progress,
1458                                                              x01 + (x11 - x01) * progress,
1459                                                              y01 + (y11 - y01) * progress);
1460                 }
1461               else
1462                 {
1463                   cairo_pattern_get_radial_circles (pattern, &x00, &y00, &r00, &x01, &y01, &r01);
1464                   cairo_pattern_get_radial_circles (other_pattern, &x10, &y10, &r10, &x11, &y11, &r11);
1465
1466                   new_pattern = cairo_pattern_create_radial (x00 + (x10 - x00) * progress,
1467                                                              y00 + (y10 - y00) * progress,
1468                                                              r00 + (r10 - r00) * progress,
1469                                                              x01 + (x11 - x01) * progress,
1470                                                              y01 + (y11 - y01) * progress,
1471                                                              r01 + (r11 - r01) * progress);
1472                 }
1473
1474               cairo_pattern_set_filter (new_pattern, CAIRO_FILTER_FAST);
1475               i = 0;
1476
1477               /* Blend both gradients into one */
1478               while (i < n0 && i < n1)
1479                 {
1480                   cairo_pattern_get_color_stop_rgba (pattern, i,
1481                                                      &offset0,
1482                                                      &red0, &green0, &blue0,
1483                                                      &alpha0);
1484                   cairo_pattern_get_color_stop_rgba (other_pattern, i,
1485                                                      &offset1,
1486                                                      &red1, &green1, &blue1,
1487                                                      &alpha1);
1488
1489                   cairo_pattern_add_color_stop_rgba (new_pattern,
1490                                                      offset0 + ((offset1 - offset0) * progress),
1491                                                      red0 + ((red1 - red0) * progress),
1492                                                      green0 + ((green1 - green0) * progress),
1493                                                      blue0 + ((blue1 - blue0) * progress),
1494                                                      alpha0 + ((alpha1 - alpha0) * progress));
1495                   i++;
1496                 }
1497             }
1498           else
1499             {
1500               cairo_save (cr);
1501
1502               cairo_rectangle (cr, 0, 0, width, height);
1503               cairo_clip (cr);
1504
1505               cairo_push_group (cr);
1506
1507               cairo_scale (cr, width, height);
1508               cairo_set_source (cr, other_pattern);
1509               cairo_paint_with_alpha (cr, progress);
1510               cairo_set_source (cr, pattern);
1511               cairo_paint_with_alpha (cr, 1.0 - progress);
1512
1513               new_pattern = cairo_pop_group (cr);
1514
1515               cairo_restore (cr);
1516             }
1517         }
1518       else if (pattern || other_pattern)
1519         {
1520           cairo_pattern_t *p;
1521           const GdkRGBA *c;
1522           gdouble x0, y0, x1, y1, r0, r1;
1523           gint n, i;
1524
1525           /* Blend a pattern with a color */
1526           if (pattern)
1527             {
1528               p = pattern;
1529               c = &other_bg;
1530               progress = 1 - progress;
1531             }
1532           else
1533             {
1534               p = other_pattern;
1535               c = &bg_color;
1536             }
1537
1538           if (cairo_pattern_get_type (p) == CAIRO_PATTERN_TYPE_LINEAR)
1539             {
1540               cairo_pattern_get_linear_points (p, &x0, &y0, &x1, &y1);
1541               new_pattern = cairo_pattern_create_linear (x0, y0, x1, y1);
1542             }
1543           else
1544             {
1545               cairo_pattern_get_radial_circles (p, &x0, &y0, &r0, &x1, &y1, &r1);
1546               new_pattern = cairo_pattern_create_radial (x0, y0, r0, x1, y1, r1);
1547             }
1548
1549           cairo_pattern_get_color_stop_count (p, &n);
1550
1551           for (i = 0; i < n; i++)
1552             {
1553               gdouble red1, green1, blue1, alpha1;
1554               gdouble offset;
1555
1556               cairo_pattern_get_color_stop_rgba (p, i,
1557                                                  &offset,
1558                                                  &red1, &green1, &blue1,
1559                                                  &alpha1);
1560               cairo_pattern_add_color_stop_rgba (new_pattern, offset,
1561                                                  c->red + ((red1 - c->red) * progress),
1562                                                  c->green + ((green1 - c->green) * progress),
1563                                                  c->blue + ((blue1 - c->blue) * progress),
1564                                                  c->alpha + ((alpha1 - c->alpha) * progress));
1565             }
1566         }
1567       else
1568         {
1569           /* Merge just colors */
1570           new_pattern = cairo_pattern_create_rgba (CLAMP (bg_color.red + ((other_bg.red - bg_color.red) * progress), 0, 1),
1571                                                    CLAMP (bg_color.green + ((other_bg.green - bg_color.green) * progress), 0, 1),
1572                                                    CLAMP (bg_color.blue + ((other_bg.blue - bg_color.blue) * progress), 0, 1),
1573                                                    CLAMP (bg_color.alpha + ((other_bg.alpha - bg_color.alpha) * progress), 0, 1));
1574         }
1575
1576       if (new_pattern)
1577         {
1578           /* Replace pattern to use */
1579           cairo_pattern_destroy (pattern);
1580           pattern = new_pattern;
1581         }
1582
1583       if (other_pattern)
1584         cairo_pattern_destroy (other_pattern);
1585     }
1586
1587   _gtk_rounded_box_init_rect (&border_box, 0, 0, width, height);
1588   _gtk_rounded_box_apply_border_radius (&border_box, engine, flags, junction);
1589   _gtk_rounded_box_path (&border_box, cr);
1590
1591   if (pattern)
1592     {
1593       cairo_scale (cr, width, height);
1594       cairo_set_source (cr, pattern);
1595       cairo_scale (cr, 1.0 / width, 1.0 / height);
1596     }
1597   else
1598     gdk_cairo_set_source_rgba (cr, &bg_color);
1599
1600   cairo_fill (cr);
1601
1602   if (pattern)
1603     cairo_pattern_destroy (pattern);
1604
1605   if (box_shadow != NULL)
1606     {
1607       GtkBorder border;
1608       gtk_theming_engine_get_border (engine, flags, &border);
1609       _gtk_rounded_box_shrink (&border_box,
1610                                border.top, border.right,
1611                                border.bottom, border.left);
1612       _gtk_box_shadow_render (box_shadow, cr, &border_box);
1613       _gtk_shadow_unref (box_shadow);
1614     }
1615
1616   cairo_restore (cr);
1617 }
1618
1619 static void
1620 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1621                                       cairo_t          *cr,
1622                                       gdouble           x,
1623                                       gdouble           y,
1624                                       gdouble           width,
1625                                       gdouble           height)
1626 {
1627   GtkJunctionSides junction;
1628
1629   junction = gtk_theming_engine_get_junction_sides (engine);
1630
1631   render_background_internal (engine, cr,
1632                               x, y, width, height,
1633                               junction);
1634 }
1635
1636 static void
1637 gtk_theming_engine_hide_border_sides (GtkBorder *border,
1638                                       guint      hidden_side)
1639 {
1640   if (hidden_side & SIDE_TOP)
1641     border->top = 0;
1642   if (hidden_side & SIDE_RIGHT)
1643     border->right = 0;
1644   if (hidden_side & SIDE_BOTTOM)
1645     border->bottom = 0;
1646   if (hidden_side & SIDE_LEFT)
1647     border->left = 0;
1648 }
1649
1650 static void
1651 render_frame_internal (GtkThemingEngine *engine,
1652                        cairo_t          *cr,
1653                        gdouble           x,
1654                        gdouble           y,
1655                        gdouble           width,
1656                        gdouble           height,
1657                        guint             hidden_side,
1658                        GtkJunctionSides  junction)
1659 {
1660   GtkStateFlags state;
1661   GtkBorderStyle border_style;
1662   GtkRoundedBox border_box, padding_box;
1663   gdouble progress;
1664   gboolean running;
1665   GtkBorder border;
1666   static const guint current_side[4] = { SIDE_TOP, SIDE_RIGHT, SIDE_BOTTOM, SIDE_LEFT };
1667   GdkRGBA *colors[4];
1668   guint i, j;
1669
1670   state = gtk_theming_engine_get_state (engine);
1671
1672   gtk_theming_engine_get_border (engine, state, &border);
1673   gtk_theming_engine_hide_border_sides (&border, hidden_side);
1674
1675   gtk_theming_engine_get (engine, state,
1676                           "border-style", &border_style,
1677                           "border-top-color", &colors[0],
1678                           "border-right-color", &colors[1],
1679                           "border-bottom-color", &colors[2],
1680                           "border-left-color", &colors[3],
1681                           NULL);
1682
1683   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1684
1685   if (running)
1686     {
1687       GtkStateFlags other_state;
1688       GdkRGBA *other_colors[4];
1689
1690       if (state & GTK_STATE_FLAG_PRELIGHT)
1691         {
1692           other_state = state & ~(GTK_STATE_FLAG_PRELIGHT);
1693           progress = 1 - progress;
1694         }
1695       else
1696         other_state = state | GTK_STATE_FLAG_PRELIGHT;
1697
1698       gtk_theming_engine_get (engine, other_state,
1699                               "border-top-color", &other_colors[0],
1700                               "border-right-color", &other_colors[1],
1701                               "border-bottom-color", &other_colors[2],
1702                               "border-left-color", &other_colors[3],
1703                               NULL);
1704
1705       for (i = 0; i < 4; i++)
1706         {
1707           colors[i]->red = CLAMP (colors[i]->red + ((other_colors[i]->red - colors[i]->red) * progress), 0, 1);
1708           colors[i]->green = CLAMP (colors[i]->green + ((other_colors[i]->green - colors[i]->green) * progress), 0, 1);
1709           colors[i]->blue = CLAMP (colors[i]->blue + ((other_colors[i]->blue - colors[i]->blue) * progress), 0, 1);
1710           colors[i]->alpha = CLAMP (colors[i]->alpha + ((other_colors[i]->alpha - colors[i]->alpha) * progress), 0, 1);
1711           gdk_rgba_free (other_colors[i]);
1712         }
1713     }
1714
1715   switch (border_style)
1716     {
1717     default:
1718       g_assert_not_reached ();
1719     case GTK_BORDER_STYLE_NONE:
1720     case GTK_BORDER_STYLE_SOLID:
1721       break;
1722     case GTK_BORDER_STYLE_INSET:
1723       color_shade (colors[1], 1.8, colors[1]);
1724       color_shade (colors[2], 1.8, colors[2]);
1725       break;
1726     case GTK_BORDER_STYLE_OUTSET:
1727       color_shade (colors[0], 1.8, colors[0]);
1728       color_shade (colors[3], 1.8, colors[3]);
1729       break;
1730     }
1731
1732   cairo_save (cr);
1733
1734   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
1735
1736   _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1737   _gtk_rounded_box_apply_border_radius (&border_box, engine, state, junction);
1738   padding_box = border_box;
1739   _gtk_rounded_box_shrink (&padding_box, border.top, border.right, border.bottom, border.left);
1740
1741   switch (border_style)
1742     {
1743     case GTK_BORDER_STYLE_NONE:
1744       break;
1745     case GTK_BORDER_STYLE_SOLID:
1746     case GTK_BORDER_STYLE_INSET:
1747     case GTK_BORDER_STYLE_OUTSET:
1748
1749       if (gdk_rgba_equal (colors[0], colors[1]) &&
1750           gdk_rgba_equal (colors[0], colors[2]) &&
1751           gdk_rgba_equal (colors[0], colors[3]))
1752         {
1753           gdk_cairo_set_source_rgba (cr, colors[0]);
1754
1755           _gtk_rounded_box_path (&border_box, cr);
1756           _gtk_rounded_box_path (&padding_box, cr);
1757           cairo_fill (cr);
1758         }
1759       else
1760         {
1761           for (i = 0; i < 4; i++)
1762             {
1763               if (hidden_side & current_side[i])
1764                 continue;
1765
1766               for (j = 0; j < 4; j++)
1767                 {
1768                   if (hidden_side & current_side[j])
1769                     continue;
1770
1771                   if (i == j ||
1772                       gdk_rgba_equal (colors[i], colors[j]))
1773                     {
1774                       /* We were already painted when i == j */
1775                       if (i > j)
1776                         break;
1777
1778                       if (j == 0)
1779                         _gtk_rounded_box_path_top (&border_box, &padding_box, cr);
1780                       else if (j == 1)
1781                         _gtk_rounded_box_path_right (&border_box, &padding_box, cr);
1782                       else if (j == 2)
1783                         _gtk_rounded_box_path_bottom (&border_box, &padding_box, cr);
1784                       else if (j == 3)
1785                         _gtk_rounded_box_path_left (&border_box, &padding_box, cr);
1786                     }
1787                 }
1788               /* We were already painted when i == j */
1789               if (i > j)
1790                 continue;
1791
1792               gdk_cairo_set_source_rgba (cr, colors[i]);
1793
1794               cairo_fill (cr);
1795             }
1796         }
1797       break;
1798     }
1799
1800   cairo_restore (cr);
1801
1802   for (i = 0; i < 4; i++)
1803     gdk_rgba_free (colors[i]);
1804 }
1805
1806 static void
1807 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1808                                  cairo_t          *cr,
1809                                  gdouble           x,
1810                                  gdouble           y,
1811                                  gdouble           width,
1812                                  gdouble           height)
1813 {
1814   GtkStateFlags flags;
1815   GtkBorderStyle border_style;
1816   GtkJunctionSides junction;
1817   GtkBorderImage *border_image;
1818   GtkBorder border;
1819
1820   flags = gtk_theming_engine_get_state (engine);
1821   junction = gtk_theming_engine_get_junction_sides (engine);
1822   gtk_theming_engine_get_border (engine, flags, &border);
1823
1824   gtk_theming_engine_get (engine, flags,
1825                           "border-image", &border_image,
1826                           "border-style", &border_style,
1827                           NULL);
1828
1829   if (border_image != NULL)
1830     {
1831       _gtk_border_image_render (border_image, &border,
1832                                 cr, x, y, width, height);
1833       _gtk_border_image_unref (border_image);
1834     }
1835   else if (border_style != GTK_BORDER_STYLE_NONE)
1836     render_frame_internal (engine, cr,
1837                            x, y, width, height,
1838                            0, junction);
1839 }
1840
1841 static void
1842 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1843                                     cairo_t          *cr,
1844                                     gdouble           x,
1845                                     gdouble           y,
1846                                     gdouble           width,
1847                                     gdouble           height)
1848 {
1849   GtkStateFlags flags;
1850   GdkRGBA outline_color, fg_color;
1851   double vertical_overshoot;
1852   int diameter;
1853   double radius;
1854   double interp;                /* interpolation factor for center position */
1855   double x_double_horz, y_double_horz;
1856   double x_double_vert, y_double_vert;
1857   double x_double, y_double;
1858   gdouble angle;
1859   gint line_width;
1860   gboolean running, is_rtl;
1861   gdouble progress;
1862
1863   cairo_save (cr);
1864   flags = gtk_theming_engine_get_state (engine);
1865
1866   gtk_theming_engine_get_color (engine, flags, &fg_color);
1867   gtk_theming_engine_get_border_color (engine, flags, &outline_color);
1868
1869   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1870   is_rtl = (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL);
1871   line_width = 1;
1872
1873   if (!running)
1874     progress = (flags & GTK_STATE_FLAG_ACTIVE) ? 1 : 0;
1875
1876   if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_HORIZONTAL))
1877     {
1878       if (is_rtl)
1879         angle = (G_PI) - ((G_PI / 2) * progress);
1880       else
1881         angle = (G_PI / 2) * progress;
1882     }
1883   else
1884     {
1885       if (is_rtl)
1886         angle = (G_PI / 2) + ((G_PI / 2) * progress);
1887       else
1888         angle = (G_PI / 2) - ((G_PI / 2) * progress);
1889     }
1890
1891   interp = progress;
1892
1893   /* Compute distance that the stroke extends beyonds the end
1894    * of the triangle we draw.
1895    */
1896   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
1897
1898   /* For odd line widths, we end the vertical line of the triangle
1899    * at a half pixel, so we round differently.
1900    */
1901   if (line_width % 2 == 1)
1902     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
1903   else
1904     vertical_overshoot = ceil (vertical_overshoot);
1905
1906   /* Adjust the size of the triangle we draw so that the entire stroke fits
1907    */
1908   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
1909
1910   /* If the line width is odd, we want the diameter to be even,
1911    * and vice versa, so force the sum to be odd. This relationship
1912    * makes the point of the triangle look right.
1913    */
1914   diameter -= (1 - (diameter + line_width) % 2);
1915
1916   radius = diameter / 2.;
1917
1918   /* Adjust the center so that the stroke is properly aligned with
1919    * the pixel grid. The center adjustment is different for the
1920    * horizontal and vertical orientations. For intermediate positions
1921    * we interpolate between the two.
1922    */
1923   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1924   y_double_vert = (y + height / 2) - 0.5;
1925
1926   x_double_horz = (x + width / 2) - 0.5;
1927   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1928
1929   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
1930   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
1931
1932   cairo_translate (cr, x_double, y_double);
1933   cairo_rotate (cr, angle);
1934
1935   cairo_move_to (cr, - radius / 2., - radius);
1936   cairo_line_to (cr,   radius / 2.,   0);
1937   cairo_line_to (cr, - radius / 2.,   radius);
1938   cairo_close_path (cr);
1939
1940   cairo_set_line_width (cr, line_width);
1941
1942   gdk_cairo_set_source_rgba (cr, &fg_color);
1943
1944   cairo_fill_preserve (cr);
1945
1946   gdk_cairo_set_source_rgba (cr, &outline_color);
1947   cairo_stroke (cr);
1948
1949   cairo_restore (cr);
1950 }
1951
1952 static void
1953 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
1954                                  cairo_t          *cr,
1955                                  gdouble           x,
1956                                  gdouble           y,
1957                                  gdouble           width,
1958                                  gdouble           height)
1959 {
1960   GtkStateFlags flags;
1961   GdkRGBA color;
1962   gint line_width;
1963   gint8 *dash_list;
1964
1965   cairo_save (cr);
1966   flags = gtk_theming_engine_get_state (engine);
1967
1968   gtk_theming_engine_get_color (engine, flags, &color);
1969
1970   gtk_theming_engine_get_style (engine,
1971                                 "focus-line-width", &line_width,
1972                                 "focus-line-pattern", (gchar *) &dash_list,
1973                                 NULL);
1974
1975   cairo_set_line_width (cr, (gdouble) line_width);
1976
1977   if (dash_list[0])
1978     {
1979       gint n_dashes = strlen ((const gchar *) dash_list);
1980       gdouble *dashes = g_new (gdouble, n_dashes);
1981       gdouble total_length = 0;
1982       gdouble dash_offset;
1983       gint i;
1984
1985       for (i = 0; i < n_dashes; i++)
1986         {
1987           dashes[i] = dash_list[i];
1988           total_length += dash_list[i];
1989         }
1990
1991       /* The dash offset here aligns the pattern to integer pixels
1992        * by starting the dash at the right side of the left border
1993        * Negative dash offsets in cairo don't work
1994        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
1995        */
1996       dash_offset = - line_width / 2.;
1997
1998       while (dash_offset < 0)
1999         dash_offset += total_length;
2000
2001       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
2002       g_free (dashes);
2003     }
2004
2005   cairo_rectangle (cr,
2006                    x + line_width / 2.,
2007                    y + line_width / 2.,
2008                    width - line_width,
2009                    height - line_width);
2010
2011   gdk_cairo_set_source_rgba (cr, &color);
2012   cairo_stroke (cr);
2013
2014   cairo_restore (cr);
2015
2016   g_free (dash_list);
2017 }
2018
2019 static void
2020 gtk_theming_engine_render_line (GtkThemingEngine *engine,
2021                                 cairo_t          *cr,
2022                                 gdouble           x0,
2023                                 gdouble           y0,
2024                                 gdouble           x1,
2025                                 gdouble           y1)
2026 {
2027   GdkRGBA bg_color, darker, lighter;
2028   GtkStateFlags flags;
2029   gint i, thickness, thickness_dark, thickness_light, len;
2030   cairo_matrix_t matrix;
2031   gdouble angle;
2032
2033   /* FIXME: thickness */
2034   thickness = 2;
2035   thickness_dark = thickness / 2;
2036   thickness_light = thickness - thickness_dark;
2037
2038   flags = gtk_theming_engine_get_state (engine);
2039   cairo_save (cr);
2040
2041   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2042   color_shade (&bg_color, 0.7, &darker);
2043   color_shade (&bg_color, 1.3, &lighter);
2044
2045   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
2046   cairo_set_line_width (cr, 1);
2047
2048   angle = atan2 (x1 - x0, y1 - y0);
2049   angle = (2 * G_PI) - angle;
2050   angle += G_PI / 2;
2051
2052   cairo_get_matrix (cr, &matrix);
2053   cairo_matrix_translate (&matrix, x0, y0);
2054   cairo_matrix_rotate (&matrix, angle);
2055   cairo_set_matrix (cr, &matrix);
2056
2057   x1 -= x0;
2058   y1 -= y0;
2059
2060   len = (gint) sqrt ((x1 * x1) + (y1 * y1));
2061
2062   y0 = -thickness_dark;
2063
2064   for (i = 0; i < thickness_dark; i++)
2065     {
2066       gdk_cairo_set_source_rgba (cr, &lighter);
2067       add_path_line (cr, len - i - 1.5, y0, len - 0.5, y0);
2068       cairo_stroke (cr);
2069
2070       gdk_cairo_set_source_rgba (cr, &darker);
2071       add_path_line (cr, 0.5, y0, len - i - 1.5, y0);
2072       cairo_stroke (cr);
2073
2074       y0++;
2075     }
2076
2077   for (i = 0; i < thickness_light; i++)
2078     {
2079       gdk_cairo_set_source_rgba (cr, &darker);
2080       add_path_line (cr, 0.5, y0, thickness_light - i + 0.5, y0);
2081       cairo_stroke (cr);
2082
2083       gdk_cairo_set_source_rgba (cr, &lighter);
2084       add_path_line (cr, thickness_light - i + 0.5, y0, len - 0.5, y0);
2085       cairo_stroke (cr);
2086
2087       y0++;
2088     }
2089
2090   cairo_restore (cr);
2091 }
2092
2093 static void
2094 prepare_context_for_layout (cairo_t *cr,
2095                             gdouble x,
2096                             gdouble y,
2097                             PangoLayout *layout)
2098 {
2099   const PangoMatrix *matrix;
2100
2101   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2102
2103   cairo_move_to (cr, x, y);
2104
2105   if (matrix)
2106     {
2107       cairo_matrix_t cairo_matrix;
2108
2109       cairo_matrix_init (&cairo_matrix,
2110                          matrix->xx, matrix->yx,
2111                          matrix->xy, matrix->yy,
2112                          matrix->x0, matrix->y0);
2113
2114       cairo_transform (cr, &cairo_matrix);
2115     }
2116 }
2117
2118 static void
2119 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2120                                   cairo_t          *cr,
2121                                   gdouble           x,
2122                                   gdouble           y,
2123                                   PangoLayout      *layout)
2124 {
2125   GdkRGBA fg_color;
2126   GtkShadow *text_shadow = NULL;
2127   GtkStateFlags flags;
2128   gdouble progress;
2129   gboolean running;
2130
2131   cairo_save (cr);
2132   flags = gtk_theming_engine_get_state (engine);
2133   gtk_theming_engine_get_color (engine, flags, &fg_color);
2134
2135   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
2136
2137   if (running)
2138     {
2139       GtkStateFlags other_flags;
2140       GdkRGBA other_fg;
2141
2142       if (flags & GTK_STATE_FLAG_PRELIGHT)
2143         {
2144           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
2145           progress = 1 - progress;
2146         }
2147       else
2148         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
2149
2150       gtk_theming_engine_get_color (engine, other_flags, &other_fg);
2151
2152       fg_color.red = CLAMP (fg_color.red + ((other_fg.red - fg_color.red) * progress), 0, 1);
2153       fg_color.green = CLAMP (fg_color.green + ((other_fg.green - fg_color.green) * progress), 0, 1);
2154       fg_color.blue = CLAMP (fg_color.blue + ((other_fg.blue - fg_color.blue) * progress), 0, 1);
2155       fg_color.alpha = CLAMP (fg_color.alpha + ((other_fg.alpha - fg_color.alpha) * progress), 0, 1);
2156     }
2157
2158   gtk_theming_engine_get (engine, flags,
2159                           "text-shadow", &text_shadow,
2160                           NULL);
2161
2162   prepare_context_for_layout (cr, x, y, layout);
2163
2164   if (text_shadow != NULL)
2165     {
2166       _gtk_text_shadow_paint_layout (text_shadow, cr, layout);
2167       _gtk_shadow_unref (text_shadow);
2168     }
2169
2170   gdk_cairo_set_source_rgba (cr, &fg_color);
2171   pango_cairo_show_layout (cr, layout);
2172
2173   cairo_restore (cr);
2174 }
2175
2176 static void
2177 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2178                                   cairo_t          *cr,
2179                                   gdouble           x,
2180                                   gdouble           y,
2181                                   gdouble           width,
2182                                   gdouble           height,
2183                                   GtkOrientation    orientation)
2184 {
2185   const GtkWidgetPath *path;
2186   gint thickness;
2187
2188   path = gtk_theming_engine_get_path (engine);
2189
2190   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2191   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2192
2193   /* FIXME: thickness */
2194   thickness = 2;
2195
2196   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
2197     {
2198       if (orientation == GTK_ORIENTATION_VERTICAL)
2199         gtk_theming_engine_render_line (engine, cr,
2200                                         x + thickness,
2201                                         y + (gint) height / 2,
2202                                         x + width - thickness - 1,
2203                                         y + (gint) height / 2);
2204       else
2205         gtk_theming_engine_render_line (engine, cr,
2206                                         x + (gint) width / 2,
2207                                         y + thickness,
2208                                         x + (gint) width / 2,
2209                                         y + height - thickness - 1);
2210     }
2211 }
2212
2213 static void
2214 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2215                                      cairo_t          *cr,
2216                                      gdouble           x,
2217                                      gdouble           y,
2218                                      gdouble           width,
2219                                      gdouble           height,
2220                                      GtkPositionType   gap_side,
2221                                      gdouble           xy0_gap,
2222                                      gdouble           xy1_gap)
2223 {
2224   GtkJunctionSides junction;
2225   GtkStateFlags state;
2226   gint border_width;
2227   GtkCssBorderCornerRadius *top_left_radius, *top_right_radius;
2228   GtkCssBorderCornerRadius *bottom_left_radius, *bottom_right_radius;
2229   GtkCssBorderRadius border_radius = { { 0, },  };
2230   gdouble x0, y0, x1, y1, xc, yc, wc, hc;
2231   GtkBorder border;
2232
2233   xc = yc = wc = hc = 0;
2234   state = gtk_theming_engine_get_state (engine);
2235   junction = gtk_theming_engine_get_junction_sides (engine);
2236
2237   gtk_theming_engine_get_border (engine, state, &border);
2238   gtk_theming_engine_get (engine, state,
2239                           /* Can't use border-radius as it's an int for
2240                            * backwards compat */
2241                           "border-top-left-radius", &top_left_radius,
2242                           "border-top-right-radius", &top_right_radius,
2243                           "border-bottom-right-radius", &bottom_right_radius,
2244                           "border-bottom-left-radius", &bottom_left_radius,
2245                           NULL);
2246
2247   if (top_left_radius)
2248     border_radius.top_left = *top_left_radius;
2249   g_free (top_left_radius);
2250   if (top_right_radius)
2251     border_radius.top_right = *top_right_radius;
2252   g_free (top_right_radius);
2253   if (bottom_right_radius)
2254     border_radius.bottom_right = *bottom_right_radius;
2255   g_free (bottom_right_radius);
2256   if (bottom_left_radius)
2257     border_radius.bottom_left = *bottom_left_radius;
2258   g_free (bottom_left_radius);
2259
2260   border_width = MIN (MIN (border.top, border.bottom),
2261                       MIN (border.left, border.right));
2262
2263   cairo_save (cr);
2264
2265   switch (gap_side)
2266     {
2267     case GTK_POS_TOP:
2268       xc = x + xy0_gap + border_width;
2269       yc = y;
2270       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2271       hc = border_width;
2272
2273       if (xy0_gap < border_radius.top_left.horizontal)
2274         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2275
2276       if (xy1_gap > width - border_radius.top_right.horizontal)
2277         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2278       break;
2279     case GTK_POS_BOTTOM:
2280       xc = x + xy0_gap + border_width;
2281       yc = y + height - border_width;
2282       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2283       hc = border_width;
2284
2285       if (xy0_gap < border_radius.bottom_left.horizontal)
2286         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2287
2288       if (xy1_gap > width - border_radius.bottom_right.horizontal)
2289         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2290
2291       break;
2292     case GTK_POS_LEFT:
2293       xc = x;
2294       yc = y + xy0_gap + border_width;
2295       wc = border_width;
2296       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2297
2298       if (xy0_gap < border_radius.top_left.vertical)
2299         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2300
2301       if (xy1_gap > height - border_radius.bottom_left.vertical)
2302         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2303
2304       break;
2305     case GTK_POS_RIGHT:
2306       xc = x + width - border_width;
2307       yc = y + xy0_gap + border_width;
2308       wc = border_width;
2309       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2310
2311       if (xy0_gap < border_radius.top_right.vertical)
2312         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2313
2314       if (xy1_gap > height - border_radius.bottom_right.vertical)
2315         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2316
2317       break;
2318     }
2319
2320   cairo_clip_extents (cr, &x0, &y0, &x1, &y1);
2321   cairo_rectangle (cr, x0, y0, x1 - x0, yc - y0);
2322   cairo_rectangle (cr, x0, yc, xc - x0, hc);
2323   cairo_rectangle (cr, xc + wc, yc, x1 - (xc + wc), hc);
2324   cairo_rectangle (cr, x0, yc + hc, x1 - x0, y1 - (yc + hc));
2325   cairo_clip (cr);
2326
2327   render_frame_internal (engine, cr,
2328                          x, y, width, height,
2329                          0, junction);
2330
2331   cairo_restore (cr);
2332 }
2333
2334 static void
2335 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2336                                      cairo_t          *cr,
2337                                      gdouble           x,
2338                                      gdouble           y,
2339                                      gdouble           width,
2340                                      gdouble           height,
2341                                      GtkPositionType   gap_side)
2342 {
2343   GtkJunctionSides junction = 0;
2344   guint hidden_side = 0;
2345
2346   cairo_save (cr);
2347
2348   switch (gap_side)
2349     {
2350     case GTK_POS_LEFT:
2351       junction = GTK_JUNCTION_LEFT;
2352       hidden_side = SIDE_LEFT;
2353
2354       cairo_translate (cr, x + width, y);
2355       cairo_rotate (cr, G_PI / 2);
2356       break;
2357     case GTK_POS_RIGHT:
2358       junction = GTK_JUNCTION_RIGHT;
2359       hidden_side = SIDE_RIGHT;
2360
2361       cairo_translate (cr, x, y + height);
2362       cairo_rotate (cr, - G_PI / 2);
2363       break;
2364     case GTK_POS_TOP:
2365       junction = GTK_JUNCTION_TOP;
2366       hidden_side = SIDE_TOP;
2367
2368       cairo_translate (cr, x + width, y + height);
2369       cairo_rotate (cr, G_PI);
2370       break;
2371     case GTK_POS_BOTTOM:
2372       junction = GTK_JUNCTION_BOTTOM;
2373       hidden_side = SIDE_BOTTOM;
2374
2375       cairo_translate (cr, x, y);
2376       break;
2377     }
2378
2379   if (gap_side == GTK_POS_TOP ||
2380       gap_side == GTK_POS_BOTTOM)
2381     render_background_internal (engine, cr,
2382                                 0, 0, width, height,
2383                                 GTK_JUNCTION_BOTTOM);
2384   else
2385     render_background_internal (engine, cr,
2386                                 0, 0, height, width,
2387                                 GTK_JUNCTION_BOTTOM);
2388   cairo_restore (cr);
2389
2390   cairo_save (cr);
2391
2392   render_frame_internal (engine, cr,
2393                          x, y, width, height,
2394                          hidden_side, junction);
2395
2396   cairo_restore (cr);
2397 }
2398
2399 static void
2400 render_dot (cairo_t       *cr,
2401             const GdkRGBA *lighter,
2402             const GdkRGBA *darker,
2403             gdouble        x,
2404             gdouble        y,
2405             gdouble        size)
2406 {
2407   size = CLAMP ((gint) size, 2, 3);
2408
2409   if (size == 2)
2410     {
2411       gdk_cairo_set_source_rgba (cr, lighter);
2412       cairo_rectangle (cr, x, y, 1, 1);
2413       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2414       cairo_fill (cr);
2415     }
2416   else if (size == 3)
2417     {
2418       gdk_cairo_set_source_rgba (cr, lighter);
2419       cairo_rectangle (cr, x, y, 2, 1);
2420       cairo_rectangle (cr, x, y, 1, 2);
2421       cairo_fill (cr);
2422
2423       gdk_cairo_set_source_rgba (cr, darker);
2424       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2425       cairo_rectangle (cr, x + 2, y, 1, 2);
2426       cairo_fill (cr);
2427     }
2428 }
2429
2430 static void
2431 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2432                                   cairo_t          *cr,
2433                                   gdouble           x,
2434                                   gdouble           y,
2435                                   gdouble           width,
2436                                   gdouble           height)
2437 {
2438   GtkStateFlags flags;
2439   GdkRGBA bg_color, lighter, darker;
2440   GtkJunctionSides sides;
2441   gint xx, yy;
2442
2443   cairo_save (cr);
2444   flags = gtk_theming_engine_get_state (engine);
2445
2446   cairo_set_line_width (cr, 1.0);
2447   sides = gtk_theming_engine_get_junction_sides (engine);
2448   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2449
2450   color_shade (&bg_color, 0.7, &darker);
2451   color_shade (&bg_color, 1.3, &lighter);
2452
2453   render_background_internal (engine, cr, x, y, width, height, sides);
2454
2455   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_GRIP))
2456     {
2457       /* reduce confusing values to a meaningful state */
2458       if ((sides & (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)) == (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT))
2459         sides &= ~GTK_JUNCTION_CORNER_TOPLEFT;
2460
2461       if ((sides & (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT)) == (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT))
2462         sides &= ~GTK_JUNCTION_CORNER_TOPRIGHT;
2463
2464       if (sides == 0)
2465         sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2466
2467       /* align drawing area to the connected side */
2468       if (sides == GTK_JUNCTION_LEFT)
2469         {
2470           if (height < width)
2471             width = height;
2472         }
2473       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2474         {
2475           if (width < height)
2476             height = width;
2477           else if (height < width)
2478             width = height;
2479         }
2480       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2481         {
2482           /* make it square, aligning to bottom left */
2483           if (width < height)
2484             {
2485               y += (height - width);
2486               height = width;
2487             }
2488           else if (height < width)
2489             width = height;
2490         }
2491       else if (sides == GTK_JUNCTION_RIGHT)
2492         {
2493           /* aligning to right */
2494           if (height < width)
2495             {
2496               x += (width - height);
2497               width = height;
2498             }
2499         }
2500       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2501         {
2502           if (width < height)
2503             height = width;
2504           else if (height < width)
2505             {
2506               x += (width - height);
2507               width = height;
2508             }
2509         }
2510       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2511         {
2512           /* make it square, aligning to bottom right */
2513           if (width < height)
2514             {
2515               y += (height - width);
2516               height = width;
2517             }
2518           else if (height < width)
2519             {
2520               x += (width - height);
2521               width = height;
2522             }
2523         }
2524       else if (sides == GTK_JUNCTION_TOP)
2525         {
2526           if (width < height)
2527             height = width;
2528         }
2529       else if (sides == GTK_JUNCTION_BOTTOM)
2530         {
2531           /* align to bottom */
2532           if (width < height)
2533             {
2534               y += (height - width);
2535               height = width;
2536             }
2537         }
2538       else
2539         g_assert_not_reached ();
2540
2541       if (sides == GTK_JUNCTION_LEFT ||
2542           sides == GTK_JUNCTION_RIGHT)
2543         {
2544           gint xi;
2545
2546           xi = x;
2547
2548           while (xi < x + width)
2549             {
2550               gdk_cairo_set_source_rgba (cr, &lighter);
2551               add_path_line (cr, x, y, x, y + height);
2552               cairo_stroke (cr);
2553               xi++;
2554
2555               gdk_cairo_set_source_rgba (cr, &darker);
2556               add_path_line (cr, xi, y, xi, y + height);
2557               cairo_stroke (cr);
2558               xi += 2;
2559             }
2560         }
2561       else if (sides == GTK_JUNCTION_TOP ||
2562                sides == GTK_JUNCTION_BOTTOM)
2563         {
2564           gint yi;
2565
2566           yi = y;
2567
2568           while (yi < y + height)
2569             {
2570               gdk_cairo_set_source_rgba (cr, &lighter);
2571               add_path_line (cr, x, yi, x + width, yi);
2572               cairo_stroke (cr);
2573               yi++;
2574
2575               gdk_cairo_set_source_rgba (cr, &darker);
2576               add_path_line (cr, x, yi, x + width, yi);
2577               cairo_stroke (cr);
2578               yi += 2;
2579             }
2580         }
2581       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2582         {
2583           gint xi, yi;
2584
2585           xi = x + width;
2586           yi = y + height;
2587
2588           while (xi > x + 3)
2589             {
2590               gdk_cairo_set_source_rgba (cr, &darker);
2591               add_path_line (cr, xi, y, x, yi);
2592               cairo_stroke (cr);
2593
2594               --xi;
2595               --yi;
2596
2597               add_path_line (cr, xi, y, x, yi);
2598               cairo_stroke (cr);
2599
2600               --xi;
2601               --yi;
2602
2603               gdk_cairo_set_source_rgba (cr, &lighter);
2604               add_path_line (cr, xi, y, x, yi);
2605               cairo_stroke (cr);
2606
2607               xi -= 3;
2608               yi -= 3;
2609             }
2610         }
2611       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2612         {
2613           gint xi, yi;
2614
2615           xi = x;
2616           yi = y + height;
2617
2618           while (xi < (x + width - 3))
2619             {
2620               gdk_cairo_set_source_rgba (cr, &lighter);
2621               add_path_line (cr, xi, y, x + width, yi);
2622               cairo_stroke (cr);
2623
2624               ++xi;
2625               --yi;
2626
2627               gdk_cairo_set_source_rgba (cr, &darker);
2628               add_path_line (cr, xi, y, x + width, yi);
2629               cairo_stroke (cr);
2630
2631               ++xi;
2632               --yi;
2633
2634               add_path_line (cr, xi, y, x + width, yi);
2635               cairo_stroke (cr);
2636
2637               xi += 3;
2638               yi -= 3;
2639             }
2640         }
2641       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2642         {
2643           gint xi, yi;
2644
2645           xi = x + width;
2646           yi = y;
2647
2648           while (xi > x + 3)
2649             {
2650               gdk_cairo_set_source_rgba (cr, &darker);
2651               add_path_line (cr, x, yi, xi, y + height);
2652               cairo_stroke (cr);
2653
2654               --xi;
2655               ++yi;
2656
2657               add_path_line (cr, x, yi, xi, y + height);
2658               cairo_stroke (cr);
2659
2660               --xi;
2661               ++yi;
2662
2663               gdk_cairo_set_source_rgba (cr, &lighter);
2664               add_path_line (cr, x, yi, xi, y + height);
2665               cairo_stroke (cr);
2666
2667               xi -= 3;
2668               yi += 3;
2669             }
2670         }
2671       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2672         {
2673           gint xi, yi;
2674
2675           xi = x;
2676           yi = y;
2677
2678           while (xi < (x + width - 3))
2679             {
2680               gdk_cairo_set_source_rgba (cr, &lighter);
2681               add_path_line (cr, xi, y + height, x + width, yi);
2682               cairo_stroke (cr);
2683
2684               ++xi;
2685               ++yi;
2686
2687               gdk_cairo_set_source_rgba (cr, &darker);
2688               add_path_line (cr, xi, y + height, x + width, yi);
2689               cairo_stroke (cr);
2690
2691               ++xi;
2692               ++yi;
2693
2694               add_path_line (cr, xi, y + height, x + width, yi);
2695               cairo_stroke (cr);
2696
2697               xi += 3;
2698               yi += 3;
2699             }
2700         }
2701     }
2702   else if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_PANE_SEPARATOR))
2703     {
2704       if (width > height)
2705         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2706           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2707       else
2708         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2709           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2710     }
2711   else
2712     {
2713       for (yy = y; yy < y + height; yy += 3)
2714         for (xx = x; xx < x + width; xx += 6)
2715           {
2716             render_dot (cr, &lighter, &darker, xx, yy, 2);
2717             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2718           }
2719     }
2720
2721   cairo_restore (cr);
2722 }
2723
2724 void
2725 _gtk_theming_engine_paint_spinner (cairo_t *cr,
2726                                    gdouble  radius,
2727                                    gdouble  progress,
2728                                    GdkRGBA *color)
2729 {
2730   guint num_steps, step;
2731   gdouble half;
2732   gint i;
2733
2734   num_steps = 12;
2735
2736   if (progress >= 0)
2737     step = (guint) (progress * num_steps);
2738   else
2739     step = 0;
2740
2741   cairo_save (cr);
2742
2743   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2744   cairo_set_line_width (cr, 2.0);
2745
2746   half = num_steps / 2;
2747
2748   for (i = 0; i < num_steps; i++)
2749     {
2750       gint inset = 0.7 * radius;
2751
2752       /* transparency is a function of time and intial value */
2753       gdouble t = 1.0 - (gdouble) ((i + step) % num_steps) / num_steps;
2754       gdouble xscale = - sin (i * G_PI / half);
2755       gdouble yscale = - cos (i * G_PI / half);
2756
2757       cairo_set_source_rgba (cr,
2758                              color->red,
2759                              color->green,
2760                              color->blue,
2761                              color->alpha * t);
2762
2763       cairo_move_to (cr,
2764                      (radius - inset) * xscale,
2765                      (radius - inset) * yscale);
2766       cairo_line_to (cr,
2767                      radius * xscale,
2768                      radius * yscale);
2769
2770       cairo_stroke (cr);
2771     }
2772
2773   cairo_restore (cr);
2774 }
2775
2776 static void
2777 render_spinner (GtkThemingEngine *engine,
2778                 cairo_t          *cr,
2779                 gdouble           x,
2780                 gdouble           y,
2781                 gdouble           width,
2782                 gdouble           height)
2783 {
2784   GtkStateFlags state;
2785   GtkShadow *shadow;
2786   GdkRGBA color;
2787   gdouble progress;
2788   gdouble radius;
2789
2790   state = gtk_theming_engine_get_state (engine);
2791
2792   if (!gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
2793     progress = -1;
2794
2795   radius = MIN (width / 2, height / 2);
2796
2797   gtk_theming_engine_get_color (engine, state, &color);
2798   gtk_theming_engine_get (engine, state,
2799                           "icon-shadow", &shadow,
2800                           NULL);
2801
2802   cairo_save (cr);
2803   cairo_translate (cr, x + width / 2, y + height / 2);
2804
2805   if (shadow != NULL)
2806     {
2807       _gtk_icon_shadow_paint_spinner (shadow, cr,
2808                                       radius,
2809                                       progress);
2810       _gtk_shadow_unref (shadow);
2811     }
2812
2813   _gtk_theming_engine_paint_spinner (cr,
2814                                      radius,
2815                                      progress,
2816                                      &color);
2817
2818   cairo_restore (cr);
2819 }
2820
2821 static void
2822 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2823                                     cairo_t          *cr,
2824                                     gdouble           x,
2825                                     gdouble           y,
2826                                     gdouble           width,
2827                                     gdouble           height)
2828 {
2829   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
2830     {
2831       render_spinner (engine, cr, x, y, width, height);
2832     }
2833   else
2834     {
2835       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2836       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2837     }
2838 }
2839
2840 static GdkPixbuf *
2841 scale_or_ref (GdkPixbuf *src,
2842               gint       width,
2843               gint       height)
2844 {
2845   if (width == gdk_pixbuf_get_width (src) &&
2846       height == gdk_pixbuf_get_height (src))
2847     return g_object_ref (src);
2848   else
2849     return gdk_pixbuf_scale_simple (src,
2850                                     width, height,
2851                                     GDK_INTERP_BILINEAR);
2852 }
2853
2854 static gboolean
2855 lookup_icon_size (GtkThemingEngine *engine,
2856                   GtkIconSize       size,
2857                   gint             *width,
2858                   gint             *height)
2859 {
2860   GdkScreen *screen;
2861   GtkSettings *settings;
2862
2863   screen = gtk_theming_engine_get_screen (engine);
2864   settings = gtk_settings_get_for_screen (screen);
2865
2866   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
2867 }
2868
2869 static void
2870 colorshift_source (cairo_t *cr,
2871                    gdouble shift)
2872 {
2873   cairo_pattern_t *source;
2874
2875   cairo_save (cr);
2876   cairo_paint (cr);
2877
2878   source = cairo_pattern_reference (cairo_get_source (cr));
2879
2880   cairo_set_source_rgb (cr, shift, shift, shift);
2881   cairo_set_operator (cr, CAIRO_OPERATOR_COLOR_DODGE);
2882
2883   cairo_mask (cr, source);
2884
2885   cairo_pattern_destroy (source);
2886   cairo_restore (cr);
2887 }
2888
2889 static GdkPixbuf *
2890 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
2891                                        const GtkIconSource *source,
2892                                        GtkIconSize          size)
2893 {
2894   GdkPixbuf *scaled;
2895   GdkPixbuf *stated;
2896   GdkPixbuf *base_pixbuf;
2897   GtkStateFlags state;
2898   gint width = 1;
2899   gint height = 1;
2900   cairo_t *cr;
2901   cairo_surface_t *surface;
2902
2903   base_pixbuf = gtk_icon_source_get_pixbuf (source);
2904   state = gtk_theming_engine_get_state (engine);
2905
2906   g_return_val_if_fail (base_pixbuf != NULL, NULL);
2907
2908   if (size != (GtkIconSize) -1 &&
2909       !lookup_icon_size (engine, size, &width, &height))
2910     {
2911       g_warning (G_STRLOC ": invalid icon size '%d'", size);
2912       return NULL;
2913     }
2914
2915   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
2916    * leave it alone.
2917    */
2918   if (size != (GtkIconSize) -1 &&
2919       gtk_icon_source_get_size_wildcarded (source))
2920     scaled = scale_or_ref (base_pixbuf, width, height);
2921   else
2922     scaled = g_object_ref (base_pixbuf);
2923
2924   /* If the state was wildcarded, then generate a state. */
2925   if (gtk_icon_source_get_state_wildcarded (source))
2926     {
2927       if (state & GTK_STATE_FLAG_INSENSITIVE)
2928         {
2929           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2930                                                 gdk_pixbuf_get_width (scaled),
2931                                                 gdk_pixbuf_get_height (scaled));
2932           cr = cairo_create (surface);
2933           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2934           cairo_paint_with_alpha (cr, 0.5);
2935
2936           cairo_destroy (cr);
2937
2938           g_object_unref (scaled);
2939           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2940                                                 cairo_image_surface_get_width (surface),
2941                                                 cairo_image_surface_get_height (surface));
2942           cairo_surface_destroy (surface);
2943         }
2944       else if (state & GTK_STATE_FLAG_PRELIGHT)
2945         {
2946           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2947                                                 gdk_pixbuf_get_width (scaled),
2948                                                 gdk_pixbuf_get_height (scaled));
2949
2950           cr = cairo_create (surface);
2951           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2952           colorshift_source (cr, 0.10);
2953
2954           cairo_destroy (cr);
2955
2956           g_object_unref (scaled);
2957           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2958                                                 cairo_image_surface_get_width (surface),
2959                                                 cairo_image_surface_get_height (surface));
2960           cairo_surface_destroy (surface);
2961         }
2962       else
2963         stated = scaled;
2964     }
2965   else
2966     stated = scaled;
2967
2968   return stated;
2969 }
2970
2971 static void
2972 gtk_theming_engine_render_icon (GtkThemingEngine *engine,
2973                                 cairo_t *cr,
2974                                 GdkPixbuf *pixbuf,
2975                                 gdouble x,
2976                                 gdouble y)
2977 {
2978   GtkStateFlags state;
2979   GtkShadow *icon_shadow;
2980
2981   state = gtk_theming_engine_get_state (engine);
2982
2983   cairo_save (cr);
2984
2985   gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
2986
2987   gtk_theming_engine_get (engine, state,
2988                           "icon-shadow", &icon_shadow,
2989                           NULL);
2990
2991   if (icon_shadow != NULL)
2992     {
2993       _gtk_icon_shadow_paint (icon_shadow, cr);
2994       _gtk_shadow_unref (icon_shadow);
2995     }
2996
2997   cairo_paint (cr);
2998
2999   cairo_restore (cr);
3000 }
3001