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 "gtk9slice.h"
  31 #include "gtkpango.h"
  32
  33 /**
  34  * SECTION:gtkthemingengine
  35  * @Short_description: Theming renderers
  36  * @Title: GtkThemingEngine
  37  * @See_also: #GtkStyleContext
  38  *
  39  * #GtkThemingEngine is the object used for rendering themed content
  40  * in GTK+ widgets. Even though GTK+ has a default implementation,
  41  * it can be overridden in CSS files by enforcing a #GtkThemingEngine
  42  * object to be loaded as a module.
  43  *
  44  * In order to implement a theming engine, a #GtkThemingEngine subclass
  45  * must be created, alongside the CSS file that will reference it, the
  46  * theming engine would be created as an .so library, and installed in
  47  * $(gtk-modules-dir)/theming-engines/.
  48  *
  49  * #GtkThemingEngine<!-- -->s have limited access to the object they are
  50  * rendering, the #GtkThemingEngine API has read-only accessors to the
  51  * style information contained in the rendered object's #GtkStyleContext.
  52  */
  53
  54 typedef struct GtkThemingEnginePrivate GtkThemingEnginePrivate;
  55
  56 enum {
  57   SIDE_LEFT   = 1,
  58   SIDE_BOTTOM = 1 << 1,
  59   SIDE_RIGHT  = 1 << 2,
  60   SIDE_TOP    = 1 << 3,
  61   SIDE_ALL    = 0xF
  62 };
  63
  64 enum {
  65   PROP_0,
  66   PROP_NAME
  67 };
  68
  69 struct GtkThemingEnginePrivate
  70 {
  71   GtkStyleContext *context;
  72   gchar *name;
  73 };
  74
  75 #define GTK_THEMING_ENGINE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_THEMING_ENGINE, GtkThemingEnginePrivate))
  76
  77 static void gtk_theming_engine_finalize          (GObject      *object);
  78 static void gtk_theming_engine_impl_set_property (GObject      *object,
  79                                                   guint         prop_id,
  80                                                   const GValue *value,
  81                                                   GParamSpec   *pspec);
  82 static void gtk_theming_engine_impl_get_property (GObject      *object,
  83                                                   guint         prop_id,
  84                                                   GValue       *value,
  85                                                   GParamSpec   *pspec);
  86
  87 static void gtk_theming_engine_render_check (GtkThemingEngine *engine,
  88                                              cairo_t          *cr,
  89                                              gdouble           x,
  90                                              gdouble           y,
  91                                              gdouble           width,
  92                                              gdouble           height);
  93 static void gtk_theming_engine_render_option (GtkThemingEngine *engine,
  94                                               cairo_t          *cr,
  95                                               gdouble           x,
  96                                               gdouble           y,
  97                                               gdouble           width,
  98                                               gdouble           height);
  99 static void gtk_theming_engine_render_arrow  (GtkThemingEngine *engine,
 100                                               cairo_t          *cr,
 101                                               gdouble           angle,
 102                                               gdouble           x,
 103                                               gdouble           y,
 104                                               gdouble           size);
 105 static void gtk_theming_engine_render_background (GtkThemingEngine *engine,
 106                                                   cairo_t          *cr,
 107                                                   gdouble           x,
 108                                                   gdouble           y,
 109                                                   gdouble           width,
 110                                                   gdouble           height);
 111 static void gtk_theming_engine_render_frame  (GtkThemingEngine *engine,
 112                                               cairo_t          *cr,
 113                                               gdouble           x,
 114                                               gdouble           y,
 115                                               gdouble           width,
 116                                               gdouble           height);
 117 static void gtk_theming_engine_render_expander (GtkThemingEngine *engine,
 118                                                 cairo_t          *cr,
 119                                                 gdouble           x,
 120                                                 gdouble           y,
 121                                                 gdouble           width,
 122                                                 gdouble           height);
 123 static void gtk_theming_engine_render_focus    (GtkThemingEngine *engine,
 124                                                 cairo_t          *cr,
 125                                                 gdouble           x,
 126                                                 gdouble           y,
 127                                                 gdouble           width,
 128                                                 gdouble           height);
 129 static void gtk_theming_engine_render_layout   (GtkThemingEngine *engine,
 130                                                 cairo_t          *cr,
 131                                                 gdouble           x,
 132                                                 gdouble           y,
 133                                                 PangoLayout      *layout);
 134 static void gtk_theming_engine_render_line     (GtkThemingEngine *engine,
 135                                                 cairo_t          *cr,
 136                                                 gdouble           x0,
 137                                                 gdouble           y0,
 138                                                 gdouble           x1,
 139                                                 gdouble           y1);
 140 static void gtk_theming_engine_render_slider   (GtkThemingEngine *engine,
 141                                                 cairo_t          *cr,
 142                                                 gdouble           x,
 143                                                 gdouble           y,
 144                                                 gdouble           width,
 145                                                 gdouble           height,
 146                                                 GtkOrientation    orientation);
 147 static void gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
 148                                                  cairo_t          *cr,
 149                                                  gdouble           x,
 150                                                  gdouble           y,
 151                                                  gdouble           width,
 152                                                  gdouble           height,
 153                                                  GtkPositionType   gap_side,
 154                                                  gdouble           xy0_gap,
 155                                                  gdouble           xy1_gap);
 156 static void gtk_theming_engine_render_extension (GtkThemingEngine *engine,
 157                                                  cairo_t          *cr,
 158                                                  gdouble           x,
 159                                                  gdouble           y,
 160                                                  gdouble           width,
 161                                                  gdouble           height,
 162                                                  GtkPositionType   gap_side);
 163 static void gtk_theming_engine_render_handle    (GtkThemingEngine *engine,
 164                                                  cairo_t          *cr,
 165                                                  gdouble           x,
 166                                                  gdouble           y,
 167                                                  gdouble           width,
 168                                                  gdouble           height);
 169 static void gtk_theming_engine_render_activity  (GtkThemingEngine *engine,
 170                                                  cairo_t          *cr,
 171                                                  gdouble           x,
 172                                                  gdouble           y,
 173                                                  gdouble           width,
 174                                                  gdouble           height);
 175 static GdkPixbuf * gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
 176                                                           const GtkIconSource *source,
 177                                                           GtkIconSize          size);
 178
 179 G_DEFINE_TYPE (GtkThemingEngine, gtk_theming_engine, G_TYPE_OBJECT)
 180
 181
 182 typedef struct GtkThemingModule GtkThemingModule;
 183 typedef struct GtkThemingModuleClass GtkThemingModuleClass;
 184
 185 struct GtkThemingModule
 186 {
 187   GTypeModule parent_instance;
 188   GModule *module;
 189   gchar *name;
 190
 191   void (*init) (GTypeModule *module);
 192   void (*exit) (void);
 193   GtkThemingEngine * (*create_engine) (void);
 194 };
 195
 196 struct GtkThemingModuleClass
 197 {
 198   GTypeModuleClass parent_class;
 199 };
 200
 201 #define GTK_TYPE_THEMING_MODULE  (gtk_theming_module_get_type ())
 202 #define GTK_THEMING_MODULE(o)    (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_THEMING_MODULE, GtkThemingModule))
 203 #define GTK_IS_THEMING_MODULE(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_THEMING_MODULE))
 204
 205 G_DEFINE_TYPE (GtkThemingModule, gtk_theming_module, G_TYPE_TYPE_MODULE);
 206
 207 static void
 208 gtk_theming_engine_class_init (GtkThemingEngineClass *klass)
 209 {
 210   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 211
 212   object_class->finalize = gtk_theming_engine_finalize;
 213   object_class->set_property = gtk_theming_engine_impl_set_property;
 214   object_class->get_property = gtk_theming_engine_impl_get_property;
 215
 216   klass->render_check = gtk_theming_engine_render_check;
 217   klass->render_option = gtk_theming_engine_render_option;
 218   klass->render_arrow = gtk_theming_engine_render_arrow;
 219   klass->render_background = gtk_theming_engine_render_background;
 220   klass->render_frame = gtk_theming_engine_render_frame;
 221   klass->render_expander = gtk_theming_engine_render_expander;
 222   klass->render_focus = gtk_theming_engine_render_focus;
 223   klass->render_layout = gtk_theming_engine_render_layout;
 224   klass->render_line = gtk_theming_engine_render_line;
 225   klass->render_slider = gtk_theming_engine_render_slider;
 226   klass->render_frame_gap = gtk_theming_engine_render_frame_gap;
 227   klass->render_extension = gtk_theming_engine_render_extension;
 228   klass->render_handle = gtk_theming_engine_render_handle;
 229   klass->render_activity = gtk_theming_engine_render_activity;
 230   klass->render_icon_pixbuf = gtk_theming_engine_render_icon_pixbuf;
 231
 232   /**
 233    * GtkThemingEngine:name:
 234    *
 235    * The theming engine name, this name will be used when registering
 236    * custom properties, for a theming engine named "Clearlooks" registering
 237    * a "glossy" custom property, it could be referenced in the CSS file as
 238    *
 239    * <programlisting>
 240    * -Clearlooks-glossy: true;
 241    * </programlisting>
 242    *
 243    * Since: 3.0
 244    */
 245   g_object_class_install_property (object_class,
 246                                    PROP_NAME,
 247                                    g_param_spec_string ("name",
 248                                                         P_("Name"),
 249                                                         P_("Theming engine name"),
 250                                                         NULL,
 251                                                         G_PARAM_CONSTRUCT_ONLY | GTK_PARAM_READWRITE));
 252
 253   g_type_class_add_private (object_class, sizeof (GtkThemingEnginePrivate));
 254 }
 255
 256 static void
 257 gtk_theming_engine_init (GtkThemingEngine *engine)
 258 {
 259   engine->priv = GTK_THEMING_ENGINE_GET_PRIVATE (engine);
 260 }
 261
 262 static void
 263 gtk_theming_engine_finalize (GObject *object)
 264 {
 265   GtkThemingEnginePrivate *priv;
 266
 267   priv = GTK_THEMING_ENGINE (object)->priv;
 268   g_free (priv->name);
 269
 270   G_OBJECT_GET_CLASS (gtk_theming_engine_parent_class)->finalize (object);
 271 }
 272
 273 static void
 274 gtk_theming_engine_impl_set_property (GObject      *object,
 275                                       guint         prop_id,
 276                                       const GValue *value,
 277                                       GParamSpec   *pspec)
 278 {
 279   GtkThemingEnginePrivate *priv;
 280
 281   priv = GTK_THEMING_ENGINE (object)->priv;
 282
 283   switch (prop_id)
 284     {
 285     case PROP_NAME:
 286       if (priv->name)
 287         g_free (priv->name);
 288
 289       priv->name = g_value_dup_string (value);
 290       break;
 291     default:
 292       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 293       break;
 294     }
 295 }
 296
 297 static void
 298 gtk_theming_engine_impl_get_property (GObject    *object,
 299                                       guint       prop_id,
 300                                       GValue     *value,
 301                                       GParamSpec *pspec)
 302 {
 303   GtkThemingEnginePrivate *priv;
 304
 305   priv = GTK_THEMING_ENGINE (object)->priv;
 306
 307   switch (prop_id)
 308     {
 309     case PROP_NAME:
 310       g_value_set_string (value, priv->name);
 311       break;
 312     default:
 313       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 314       break;
 315     }
 316 }
 317
 318 void
 319 _gtk_theming_engine_set_context (GtkThemingEngine *engine,
 320                                  GtkStyleContext  *context)
 321 {
 322   GtkThemingEnginePrivate *priv;
 323
 324   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 325   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
 326
 327   priv = engine->priv;
 328   priv->context = context;
 329 }
 330
 331 /**
 332  * gtk_theming_engine_register_property: (skip)
 333  * @name_space: namespace for the property name
 334  * @parse_func: parsing function to use, or %NULL
 335  * @pspec: the #GParamSpec for the new property
 336  *
 337  * Registers a property so it can be used in the CSS file format,
 338  * on the CSS file the property will look like
 339  * "-${@name_space}-${property_name}". being
 340  * ${property_name} the given to @pspec. @name_space will usually
 341  * be the theme engine name.
 342  *
 343  * For any type a @parse_func may be provided, being this function
 344  * used for turning any property value (between ':' and ';') in
 345  * CSS to the #GValue needed. For basic types there is already
 346  * builtin parsing support, so %NULL may be provided for these
 347  * cases.
 348  *
 349  * <note>
 350  * Engines must ensure property registration happens exactly once,
 351  * usually GTK+ deals with theming engines as singletons, so this
 352  * should be guaranteed to happen once, but bear this in mind
 353  * when creating #GtkThemeEngine<!-- -->s yourself.
 354  * </note>
 355  *
 356  * <note>
 357  * In order to make use of the custom registered properties in
 358  * the CSS file, make sure the engine is loaded first by specifying
 359  * the engine property, either in a previous rule or within the same
 360  * one.
 361  * <programlisting>
 362  * &ast; {
 363  *     engine: someengine;
 364  *     -SomeEngine-custom-property: 2;
 365  * }
 366  * </programlisting>
 367  * </note>
 368  *
 369  * Since: 3.0
 370  **/
 371 void
 372 gtk_theming_engine_register_property (const gchar            *name_space,
 373                                       GtkStylePropertyParser  parse_func,
 374                                       GParamSpec             *pspec)
 375 {
 376   gchar *name;
 377
 378   g_return_if_fail (name_space != NULL);
 379   g_return_if_fail (strchr (name_space, ' ') == NULL);
 380   g_return_if_fail (G_IS_PARAM_SPEC (pspec));
 381
 382   /* FIXME: hack hack hack, replacing pspec->name to include namespace */
 383   name = g_strdup_printf ("-%s-%s", name_space, pspec->name);
 384   g_free (pspec->name);
 385   pspec->name = name;
 386
 387   gtk_style_properties_register_property (parse_func, pspec);
 388 }
 389
 390 /**
 391  * gtk_theming_engine_get_property:
 392  * @engine: a #GtkThemingEngine
 393  * @property: the property name
 394  * @state: state to retrieve the value for
 395  * @value: (out) (transfer full): return location for the property value,
 396  *         you must free this memory using g_value_unset() once you are
 397  *         done with it.
 398  *
 399  * Gets a property value as retrieved from the style settings that apply
 400  * to the currently rendered element.
 401  *
 402  * Since: 3.0
 403  **/
 404 void
 405 gtk_theming_engine_get_property (GtkThemingEngine *engine,
 406                                  const gchar      *property,
 407                                  GtkStateFlags     state,
 408                                  GValue           *value)
 409 {
 410   GtkThemingEnginePrivate *priv;
 411
 412   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 413   g_return_if_fail (property != NULL);
 414   g_return_if_fail (value != NULL);
 415
 416   priv = engine->priv;
 417   gtk_style_context_get_property (priv->context, property, state, value);
 418 }
 419
 420 /**
 421  * gtk_theming_engine_get_valist:
 422  * @engine: a #GtkThemingEngine
 423  * @state: state to retrieve values for
 424  * @args: va_list of property name/return location pairs, followed by %NULL
 425  *
 426  * Retrieves several style property values that apply to the currently
 427  * rendered element.
 428  *
 429  * Since: 3.0
 430  **/
 431 void
 432 gtk_theming_engine_get_valist (GtkThemingEngine *engine,
 433                                GtkStateFlags     state,
 434                                va_list           args)
 435 {
 436   GtkThemingEnginePrivate *priv;
 437
 438   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 439
 440   priv = engine->priv;
 441   gtk_style_context_get_valist (priv->context, state, args);
 442 }
 443
 444 /**
 445  * gtk_theming_engine_get:
 446  * @engine: a #GtkThemingEngine
 447  * @state: state to retrieve values for
 448  * @...: property name /return value pairs, followed by %NULL
 449  *
 450  * Retrieves several style property values that apply to the currently
 451  * rendered element.
 452  *
 453  * Since: 3.0
 454  **/
 455 void
 456 gtk_theming_engine_get (GtkThemingEngine *engine,
 457                         GtkStateFlags     state,
 458                         ...)
 459 {
 460   GtkThemingEnginePrivate *priv;
 461   va_list args;
 462
 463   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 464
 465   priv = engine->priv;
 466
 467   va_start (args, state);
 468   gtk_style_context_get_valist (priv->context, state, args);
 469   va_end (args);
 470 }
 471
 472 /**
 473  * gtk_theming_engine_get_style_property:
 474  * @engine: a #GtkThemingEngine
 475  * @property_name: the name of the widget style property
 476  * @value: Return location for the property value, free with
 477  *         g_value_unset() after use.
 478  *
 479  * Gets the value for a widget style property.
 480  *
 481  * Since: 3.0
 482  **/
 483 void
 484 gtk_theming_engine_get_style_property (GtkThemingEngine *engine,
 485                                        const gchar      *property_name,
 486                                        GValue           *value)
 487 {
 488   GtkThemingEnginePrivate *priv;
 489
 490   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 491   g_return_if_fail (property_name != NULL);
 492
 493   priv = engine->priv;
 494   gtk_style_context_get_style_property (priv->context, property_name, value);
 495 }
 496
 497 /**
 498  * gtk_theming_engine_get_style_valist:
 499  * @engine: a #GtkThemingEngine
 500  * @args: va_list of property name/return location pairs, followed by %NULL
 501  *
 502  * Retrieves several widget style properties from @engine according to the
 503  * currently rendered content's style.
 504  *
 505  * Since: 3.0
 506  **/
 507 void
 508 gtk_theming_engine_get_style_valist (GtkThemingEngine *engine,
 509                                      va_list           args)
 510 {
 511   GtkThemingEnginePrivate *priv;
 512
 513   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 514
 515   priv = engine->priv;
 516   gtk_style_context_get_style_valist (priv->context, args);
 517 }
 518
 519 /**
 520  * gtk_theming_engine_get_style:
 521  * @engine: a #GtkThemingEngine
 522  * @...: property name /return value pairs, followed by %NULL
 523  *
 524  * Retrieves several widget style properties from @engine according
 525  * to the currently rendered content's style.
 526  *
 527  * Since: 3.0
 528  **/
 529 void
 530 gtk_theming_engine_get_style (GtkThemingEngine *engine,
 531                               ...)
 532 {
 533   GtkThemingEnginePrivate *priv;
 534   va_list args;
 535
 536   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 537
 538   priv = engine->priv;
 539
 540   va_start (args, engine);
 541   gtk_style_context_get_style_valist (priv->context, args);
 542   va_end (args);
 543 }
 544
 545 /**
 546  * gtk_theming_engine_lookup_color:
 547  * @engine: a #GtkThemingEngine
 548  * @color_name: color name to lookup
 549  * @color: (out): Return location for the looked up color
 550  *
 551  * Looks up and resolves a color name in the current style's color map.
 552  *
 553  * Returns: %TRUE if @color_name was found and resolved, %FALSE otherwise
 554  **/
 555 gboolean
 556 gtk_theming_engine_lookup_color (GtkThemingEngine *engine,
 557                                  const gchar      *color_name,
 558                                  GdkRGBA          *color)
 559 {
 560   GtkThemingEnginePrivate *priv;
 561
 562   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 563   g_return_val_if_fail (color_name != NULL, FALSE);
 564
 565   priv = engine->priv;
 566   return gtk_style_context_lookup_color (priv->context, color_name, color);
 567 }
 568
 569 /**
 570  * gtk_theming_engine_get_state:
 571  * @engine: a #GtkThemingEngine
 572  *
 573  * returns the state used when rendering.
 574  *
 575  * Returns: the state flags
 576  *
 577  * Since: 3.0
 578  **/
 579 GtkStateFlags
 580 gtk_theming_engine_get_state (GtkThemingEngine *engine)
 581 {
 582   GtkThemingEnginePrivate *priv;
 583
 584   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 585
 586   priv = engine->priv;
 587   return gtk_style_context_get_state (priv->context);
 588 }
 589
 590 /**
 591  * gtk_theming_engine_state_is_running:
 592  * @engine: a #GtkThemingEngine
 593  * @state: a widget state
 594  * @progress: (out): return location for the transition progress
 595  *
 596  * Returns %TRUE if there is a transition animation running for the
 597  * current region (see gtk_style_context_push_animatable_region()).
 598  *
 599  * If @progress is not %NULL, the animation progress will be returned
 600  * there, 0.0 means the state is closest to being %FALSE, while 1.0 means
 601  * it's closest to being %TRUE. This means transition animations will
 602  * run from 0 to 1 when @state is being set to %TRUE and from 1 to 0 when
 603  * it's being set to %FALSE.
 604  *
 605  * Returns: %TRUE if there is a running transition animation for @state.
 606  *
 607  * Since: 3.0
 608  **/
 609 gboolean
 610 gtk_theming_engine_state_is_running (GtkThemingEngine *engine,
 611                                      GtkStateType      state,
 612                                      gdouble          *progress)
 613 {
 614   GtkThemingEnginePrivate *priv;
 615
 616   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 617
 618   priv = engine->priv;
 619   return gtk_style_context_state_is_running (priv->context, state, progress);
 620 }
 621
 622 /**
 623  * gtk_theming_engine_get_path:
 624  * @engine: a #GtkThemingEngine
 625  *
 626  * Returns the widget path used for style matching.
 627  *
 628  * Returns: (transfer none): A #GtkWidgetPath
 629  *
 630  * Since: 3.0
 631  **/
 632 G_CONST_RETURN GtkWidgetPath *
 633 gtk_theming_engine_get_path (GtkThemingEngine *engine)
 634 {
 635   GtkThemingEnginePrivate *priv;
 636
 637   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 638
 639   priv = engine->priv;
 640   return gtk_style_context_get_path (priv->context);
 641 }
 642
 643 /**
 644  * gtk_theming_engine_has_class:
 645  * @engine: a #GtkThemingEngine
 646  * @style_class: class name to look up
 647  *
 648  * Returns %TRUE if the currently rendered contents have
 649  * defined the given class name.
 650  *
 651  * Returns: %TRUE if @engine has @class_name defined
 652  *
 653  * Since: 3.0
 654  **/
 655 gboolean
 656 gtk_theming_engine_has_class (GtkThemingEngine *engine,
 657                               const gchar      *style_class)
 658 {
 659   GtkThemingEnginePrivate *priv;
 660
 661   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 662
 663   priv = engine->priv;
 664   return gtk_style_context_has_class (priv->context, style_class);
 665 }
 666
 667 /**
 668  * gtk_theming_engine_has_region:
 669  * @engine: a #GtkThemingEngine
 670  * @style_region: a region name
 671  * @flags: (out) (allow-none): return location for region flags
 672  *
 673  * Returns %TRUE if the currently rendered contents have the
 674  * region defined. If @flags_return is not %NULL, it is set
 675  * to the flags affecting the region.
 676  *
 677  * Returns: %TRUE if region is defined
 678  *
 679  * Since: 3.0
 680  **/
 681 gboolean
 682 gtk_theming_engine_has_region (GtkThemingEngine *engine,
 683                                const gchar      *style_region,
 684                                GtkRegionFlags   *flags)
 685 {
 686   GtkThemingEnginePrivate *priv;
 687
 688   if (flags)
 689     *flags = 0;
 690
 691   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 692
 693   priv = engine->priv;
 694   return gtk_style_context_has_region (priv->context, style_region, flags);
 695 }
 696
 697 /**
 698  * gtk_theming_engine_get_direction:
 699  * @engine: a #GtkThemingEngine
 700  *
 701  * Returns the widget direction used for rendering.
 702  *
 703  * Returns: the widget direction
 704  *
 705  * Since: 3.0
 706  **/
 707 GtkTextDirection
 708 gtk_theming_engine_get_direction (GtkThemingEngine *engine)
 709 {
 710   GtkThemingEnginePrivate *priv;
 711
 712   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), GTK_TEXT_DIR_LTR);
 713
 714   priv = engine->priv;
 715   return gtk_style_context_get_direction (priv->context);
 716 }
 717
 718 /**
 719  * gtk_theming_engine_get_junction_sides:
 720  * @engine: a #GtkThemingEngine
 721  *
 722  * Returns the widget direction used for rendering.
 723  *
 724  * Returns: the widget direction
 725  *
 726  * Since: 3.0
 727  **/
 728 GtkJunctionSides
 729 gtk_theming_engine_get_junction_sides (GtkThemingEngine *engine)
 730 {
 731   GtkThemingEnginePrivate *priv;
 732
 733   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 734
 735   priv = engine->priv;
 736   return gtk_style_context_get_junction_sides (priv->context);
 737 }
 738
 739 /**
 740  * gtk_theming_engine_get_color:
 741  * @engine: a #GtkThemingEngine
 742  * @state: state to retrieve the color for
 743  * @color: (out): return value for the foreground color
 744  *
 745  * Gets the foreground color for a given state.
 746  *
 747  * Since: 3.0
 748  **/
 749 void
 750 gtk_theming_engine_get_color (GtkThemingEngine *engine,
 751                               GtkStateFlags     state,
 752                               GdkRGBA          *color)
 753 {
 754   GtkThemingEnginePrivate *priv;
 755
 756   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 757
 758   priv = engine->priv;
 759   gtk_style_context_get_color (priv->context, state, color);
 760 }
 761
 762 /**
 763  * gtk_theming_engine_get_background_color:
 764  * @engine: a #GtkThemingEngine
 765  * @state: state to retrieve the color for
 766  * @color: (out): return value for the background color
 767  *
 768  * Gets the background color for a given state.
 769  *
 770  * Since: 3.0
 771  **/
 772 void
 773 gtk_theming_engine_get_background_color (GtkThemingEngine *engine,
 774                                          GtkStateFlags     state,
 775                                          GdkRGBA          *color)
 776 {
 777   GtkThemingEnginePrivate *priv;
 778
 779   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 780
 781   priv = engine->priv;
 782   gtk_style_context_get_background_color (priv->context, state, color);
 783 }
 784
 785 /**
 786  * gtk_theming_engine_get_border_color:
 787  * @engine: a #GtkThemingEngine
 788  * @state: state to retrieve the color for
 789  * @color: (out): return value for the border color
 790  *
 791  * Gets the border color for a given state.
 792  *
 793  * Since: 3.0
 794  **/
 795 void
 796 gtk_theming_engine_get_border_color (GtkThemingEngine *engine,
 797                                      GtkStateFlags     state,
 798                                      GdkRGBA          *color)
 799 {
 800   GtkThemingEnginePrivate *priv;
 801
 802   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 803
 804   priv = engine->priv;
 805   gtk_style_context_get_border_color (priv->context, state, color);
 806 }
 807
 808 /**
 809  * gtk_theming_engine_get_border:
 810  * @engine: a #GtkthemingEngine
 811  * @state: state to retrieve the border for
 812  * @border: (out): return value for the border settings
 813  *
 814  * Gets the border for a given state as a #GtkBorder.
 815  *
 816  * Since: 3.0
 817  **/
 818 void
 819 gtk_theming_engine_get_border (GtkThemingEngine *engine,
 820                                GtkStateFlags     state,
 821                                GtkBorder        *border)
 822 {
 823   GtkThemingEnginePrivate *priv;
 824
 825   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 826
 827   priv = engine->priv;
 828   gtk_style_context_get_border (priv->context, state, border);
 829 }
 830
 831 /**
 832  * gtk_theming_engine_get_padding:
 833  * @engine: a #GtkthemingEngine
 834  * @state: state to retrieve the padding for
 835  * @padding: (out): return value for the padding settings
 836  *
 837  * Gets the padding for a given state as a #GtkBorder.
 838  *
 839  * Since: 3.0
 840  **/
 841 void
 842 gtk_theming_engine_get_padding (GtkThemingEngine *engine,
 843                                 GtkStateFlags     state,
 844                                 GtkBorder        *padding)
 845 {
 846   GtkThemingEnginePrivate *priv;
 847
 848   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 849
 850   priv = engine->priv;
 851   gtk_style_context_get_padding (priv->context, state, padding);
 852 }
 853
 854 /**
 855  * gtk_theming_engine_get_margin:
 856  * @engine: a #GtkThemingEngine
 857  * @state: state to retrieve the border for
 858  * @margin: (out): return value for the margin settings
 859  *
 860  * Gets the margin for a given state as a #GtkBorder.
 861  *
 862  * Since: 3.0
 863  **/
 864 void
 865 gtk_theming_engine_get_margin (GtkThemingEngine *engine,
 866                                GtkStateFlags     state,
 867                                GtkBorder        *margin)
 868 {
 869   GtkThemingEnginePrivate *priv;
 870
 871   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 872
 873   priv = engine->priv;
 874   gtk_style_context_get_margin (priv->context, state, margin);
 875 }
 876
 877 /**
 878  * gtk_theming_engine_get_font:
 879  * @engine: a #GtkThemingEngine
 880  * @state: state to retrieve the font for
 881  *
 882  * Returns the font description for a given state.
 883  *
 884  * Returns: (transfer none): the #PangoFontDescription for the given
 885  *          state. This object is owned by GTK+ and should not be
 886  *          freed.
 887  *
 888  * Since: 3.0
 889  **/
 890 const PangoFontDescription *
 891 gtk_theming_engine_get_font (GtkThemingEngine *engine,
 892                              GtkStateFlags     state)
 893 {
 894   GtkThemingEnginePrivate *priv;
 895
 896   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 897
 898   priv = engine->priv;
 899   return gtk_style_context_get_font (priv->context, state);
 900 }
 901
 902 /* GtkThemingModule */
 903
 904 static gboolean
 905 gtk_theming_module_load (GTypeModule *type_module)
 906 {
 907   GtkThemingModule *theming_module;
 908   GModule *module;
 909   gchar *name, *module_path;
 910
 911   theming_module = GTK_THEMING_MODULE (type_module);
 912   name = theming_module->name;
 913   module_path = _gtk_find_module (name, "theming-engines");
 914
 915   if (!module_path)
 916     return FALSE;
 917
 918   module = g_module_open (module_path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 919   g_free (module_path);
 920
 921   if (!module)
 922     return FALSE;
 923
 924   if (!g_module_symbol (module, "theme_init",
 925                         (gpointer *) &theming_module->init) ||
 926       !g_module_symbol (module, "theme_exit",
 927                         (gpointer *) &theming_module->exit) ||
 928       !g_module_symbol (module, "create_engine",
 929                         (gpointer *) &theming_module->create_engine))
 930     {
 931       g_module_close (module);
 932
 933       return FALSE;
 934     }
 935
 936   theming_module->module = module;
 937
 938   theming_module->init (G_TYPE_MODULE (theming_module));
 939
 940   return TRUE;
 941 }
 942
 943 static void
 944 gtk_theming_module_unload (GTypeModule *type_module)
 945 {
 946   GtkThemingModule *theming_module;
 947
 948   theming_module = GTK_THEMING_MODULE (type_module);
 949
 950   theming_module->exit ();
 951
 952   g_module_close (theming_module->module);
 953
 954   theming_module->module = NULL;
 955   theming_module->init = NULL;
 956   theming_module->exit = NULL;
 957   theming_module->create_engine = NULL;
 958 }
 959
 960 static void
 961 gtk_theming_module_class_init (GtkThemingModuleClass *klass)
 962 {
 963   GTypeModuleClass *module_class = G_TYPE_MODULE_CLASS (klass);
 964
 965   module_class->load = gtk_theming_module_load;
 966   module_class->unload = gtk_theming_module_unload;
 967 }
 968
 969 static void
 970 gtk_theming_module_init (GtkThemingModule *module)
 971 {
 972 }
 973
 974 /**
 975  * gtk_theming_engine_load:
 976  * @name: Theme engine name to load
 977  *
 978  * Loads and initializes a theming engine module from the
 979  * standard directories.
 980  *
 981  * Returns: (transfer none): A theming engine, or %NULL if
 982  * the engine @name doesn't exist.
 983  **/
 984 GtkThemingEngine *
 985 gtk_theming_engine_load (const gchar *name)
 986 {
 987   static GHashTable *engines = NULL;
 988   static GtkThemingEngine *default_engine;
 989   GtkThemingEngine *engine = NULL;
 990
 991   if (name)
 992     {
 993       if (!engines)
 994         engines = g_hash_table_new (g_str_hash, g_str_equal);
 995
 996       engine = g_hash_table_lookup (engines, name);
 997
 998       if (!engine)
 999         {
1000           GtkThemingModule *module;
1001
1002           module = g_object_new (GTK_TYPE_THEMING_MODULE, NULL);
1003           g_type_module_set_name (G_TYPE_MODULE (module), name);
1004           module->name = g_strdup (name);
1005
1006           if (module && g_type_module_use (G_TYPE_MODULE (module)))
1007             {
1008               engine = (module->create_engine) ();
1009
1010               if (engine)
1011                 g_hash_table_insert (engines, module->name, engine);
1012             }
1013         }
1014     }
1015
1016   if (!engine)
1017     {
1018       if (G_UNLIKELY (!default_engine))
1019         default_engine = g_object_new (GTK_TYPE_THEMING_ENGINE, NULL);
1020
1021       engine = default_engine;
1022     }
1023
1024   return engine;
1025 }
1026
1027 /**
1028  * gtk_theming_engine_get_screen:
1029  * @engine: a #GtkThemingEngine
1030  *
1031  * Returns the #GdkScreen to which @engine currently rendering to.
1032  *
1033  * Returns: (transfer none): a #GdkScreen, or %NULL.
1034  **/
1035 GdkScreen *
1036 gtk_theming_engine_get_screen (GtkThemingEngine *engine)
1037 {
1038   GtkThemingEnginePrivate *priv;
1039
1040   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
1041
1042   priv = engine->priv;
1043   return gtk_style_context_get_screen (priv->context);
1044 }
1045
1046 /* Paint method implementations */
1047 static void
1048 gtk_theming_engine_render_check (GtkThemingEngine *engine,
1049                                  cairo_t          *cr,
1050                                  gdouble           x,
1051                                  gdouble           y,
1052                                  gdouble           width,
1053                                  gdouble           height)
1054 {
1055   GdkRGBA *fg_color, *bg_color, *border_color;
1056   GtkStateFlags flags;
1057   gint exterior_size, interior_size, thickness, pad;
1058   GtkBorderStyle border_style;
1059   GtkBorder *border;
1060   gint border_width;
1061
1062   flags = gtk_theming_engine_get_state (engine);
1063   cairo_save (cr);
1064
1065   gtk_theming_engine_get (engine, flags,
1066                           "color", &fg_color,
1067                           "background-color", &bg_color,
1068                           "border-color", &border_color,
1069                           "border-style", &border_style,
1070                           "border-width", &border,
1071                           NULL);
1072
1073   border_width = MIN (MIN (border->top, border->bottom),
1074                       MIN (border->left, border->right));
1075   exterior_size = MIN (width, height);
1076
1077   if (exterior_size % 2 == 0) /* Ensure odd */
1078     exterior_size -= 1;
1079
1080   /* FIXME: thickness */
1081   thickness = 1;
1082   pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1083   interior_size = MAX (1, exterior_size - 2 * pad);
1084
1085   if (interior_size < 7)
1086     {
1087       interior_size = 7;
1088       pad = MAX (0, (exterior_size - interior_size) / 2);
1089     }
1090
1091   x -= (1 + exterior_size - (gint) width) / 2;
1092   y -= (1 + exterior_size - (gint) height) / 2;
1093
1094   if (border_style == GTK_BORDER_STYLE_SOLID)
1095     {
1096       cairo_set_line_width (cr, border_width);
1097
1098       cairo_rectangle (cr, x + 0.5, y + 0.5, exterior_size - 1, exterior_size - 1);
1099       gdk_cairo_set_source_rgba (cr, bg_color);
1100       cairo_fill_preserve (cr);
1101
1102       if (border_color)
1103         gdk_cairo_set_source_rgba (cr, border_color);
1104       else
1105         gdk_cairo_set_source_rgba (cr, fg_color);
1106
1107       cairo_stroke (cr);
1108     }
1109
1110   gdk_cairo_set_source_rgba (cr, fg_color);
1111
1112   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1113     {
1114       int line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1115
1116       cairo_rectangle (cr,
1117                        x + pad,
1118                        y + pad + (1 + interior_size - line_thickness) / 2,
1119                        interior_size,
1120                        line_thickness);
1121       cairo_fill (cr);
1122     }
1123   else
1124     {
1125       gdouble progress;
1126       gboolean running;
1127
1128       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1129
1130       if ((flags & GTK_STATE_FLAG_ACTIVE) || running)
1131         {
1132           if (!running)
1133             progress = 1;
1134
1135           cairo_translate (cr,
1136                            x + pad, y + pad);
1137
1138           cairo_scale (cr, interior_size / 7., interior_size / 7.);
1139
1140           cairo_rectangle (cr, 0, 0, 7 * progress, 7);
1141           cairo_clip (cr);
1142
1143           cairo_move_to  (cr, 7.0, 0.0);
1144           cairo_line_to  (cr, 7.5, 1.0);
1145           cairo_curve_to (cr, 5.3, 2.0,
1146                           4.3, 4.0,
1147                           3.5, 7.0);
1148           cairo_curve_to (cr, 3.0, 5.7,
1149                           1.3, 4.7,
1150                           0.0, 4.7);
1151           cairo_line_to  (cr, 0.2, 3.5);
1152           cairo_curve_to (cr, 1.1, 3.5,
1153                           2.3, 4.3,
1154                           3.0, 5.0);
1155           cairo_curve_to (cr, 1.0, 3.9,
1156                           2.4, 4.1,
1157                           3.2, 4.9);
1158           cairo_curve_to (cr, 3.5, 3.1,
1159                           5.2, 2.0,
1160                           7.0, 0.0);
1161
1162           cairo_fill (cr);
1163         }
1164     }
1165
1166   cairo_restore (cr);
1167
1168   gdk_rgba_free (fg_color);
1169   gdk_rgba_free (bg_color);
1170   gdk_rgba_free (border_color);
1171   gtk_border_free (border);
1172 }
1173
1174 static void
1175 gtk_theming_engine_render_option (GtkThemingEngine *engine,
1176                                   cairo_t          *cr,
1177                                   gdouble           x,
1178                                   gdouble           y,
1179                                   gdouble           width,
1180                                   gdouble           height)
1181 {
1182   GtkStateFlags flags;
1183   GdkRGBA *fg_color, *bg_color, *border_color;
1184   gint exterior_size, interior_size, pad, thickness, border_width;
1185   GtkBorderStyle border_style;
1186   GtkBorder *border;
1187
1188   flags = gtk_theming_engine_get_state (engine);
1189
1190   cairo_save (cr);
1191
1192   gtk_theming_engine_get (engine, flags,
1193                           "color", &fg_color,
1194                           "background-color", &bg_color,
1195                           "border-color", &border_color,
1196                           "border-style", &border_style,
1197                           "border-width", &border,
1198                           NULL);
1199
1200   exterior_size = MIN (width, height);
1201   border_width = MIN (MIN (border->top, border->bottom),
1202                       MIN (border->left, border->right));
1203
1204   if (exterior_size % 2 == 0) /* Ensure odd */
1205     exterior_size -= 1;
1206
1207   x -= (1 + exterior_size - width) / 2;
1208   y -= (1 + exterior_size - height) / 2;
1209
1210   if (border_style == GTK_BORDER_STYLE_SOLID)
1211     {
1212       cairo_set_line_width (cr, border_width);
1213
1214       cairo_new_sub_path (cr);
1215       cairo_arc (cr,
1216                  x + exterior_size / 2.,
1217                  y + exterior_size / 2.,
1218                  (exterior_size - 1) / 2.,
1219                  0, 2 * G_PI);
1220
1221       gdk_cairo_set_source_rgba (cr, bg_color);
1222       cairo_fill_preserve (cr);
1223
1224       if (border_color)
1225         gdk_cairo_set_source_rgba (cr, border_color);
1226       else
1227         gdk_cairo_set_source_rgba (cr, fg_color);
1228
1229       cairo_stroke (cr);
1230     }
1231
1232   gdk_cairo_set_source_rgba (cr, fg_color);
1233
1234   /* FIXME: thickness */
1235   thickness = 1;
1236
1237   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1238     {
1239       gint line_thickness;
1240
1241       pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1242       interior_size = MAX (1, exterior_size - 2 * pad);
1243
1244       if (interior_size < 7)
1245         {
1246           interior_size = 7;
1247           pad = MAX (0, (exterior_size - interior_size) / 2);
1248         }
1249
1250       line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1251
1252       cairo_rectangle (cr,
1253                        x + pad,
1254                        y + pad + (interior_size - line_thickness) / 2.,
1255                        interior_size,
1256                        line_thickness);
1257       cairo_fill (cr);
1258     }
1259   if (flags & GTK_STATE_FLAG_ACTIVE)
1260     {
1261       pad = thickness + MAX (1, 2 * (exterior_size - 2 * thickness) / 9);
1262       interior_size = MAX (1, exterior_size - 2 * pad);
1263
1264       if (interior_size < 5)
1265         {
1266           interior_size = 7;
1267           pad = MAX (0, (exterior_size - interior_size) / 2);
1268         }
1269
1270       cairo_new_sub_path (cr);
1271       cairo_arc (cr,
1272                  x + pad + interior_size / 2.,
1273                  y + pad + interior_size / 2.,
1274                  interior_size / 2.,
1275                  0, 2 * G_PI);
1276       cairo_fill (cr);
1277     }
1278
1279   cairo_restore (cr);
1280
1281   gdk_rgba_free (fg_color);
1282   gdk_rgba_free (bg_color);
1283   gdk_rgba_free (border_color);
1284   gtk_border_free (border);
1285 }
1286
1287 static void
1288 add_path_arrow (cairo_t *cr,
1289                 gdouble  angle,
1290                 gdouble  x,
1291                 gdouble  y,
1292                 gdouble  size)
1293 {
1294   cairo_save (cr);
1295
1296   cairo_translate (cr, x + (size / 2), y + (size / 2));
1297   cairo_rotate (cr, angle);
1298
1299   cairo_move_to (cr, 0, - (size / 4));
1300   cairo_line_to (cr, - (size / 2), (size / 4));
1301   cairo_line_to (cr, (size / 2), (size / 4));
1302   cairo_close_path (cr);
1303
1304   cairo_restore (cr);
1305 }
1306
1307 static void
1308 gtk_theming_engine_render_arrow (GtkThemingEngine *engine,
1309                                  cairo_t          *cr,
1310                                  gdouble           angle,
1311                                  gdouble           x,
1312                                  gdouble           y,
1313                                  gdouble           size)
1314 {
1315   GtkStateFlags flags;
1316   GdkRGBA *fg_color;
1317
1318   cairo_save (cr);
1319
1320   flags = gtk_theming_engine_get_state (engine);
1321
1322   gtk_theming_engine_get (engine, flags,
1323                           "color", &fg_color,
1324                           NULL);
1325
1326   if (flags & GTK_STATE_FLAG_INSENSITIVE)
1327     {
1328       add_path_arrow (cr, angle, x + 1, y + 1, size);
1329       cairo_set_source_rgb (cr, 1, 1, 1);
1330       cairo_fill (cr);
1331     }
1332
1333   add_path_arrow (cr, angle, x, y, size);
1334   gdk_cairo_set_source_rgba (cr, fg_color);
1335   cairo_fill (cr);
1336
1337   cairo_restore (cr);
1338
1339   gdk_rgba_free (fg_color);
1340 }
1341
1342 static void
1343 add_path_line (cairo_t        *cr,
1344                gdouble         x1,
1345                gdouble         y1,
1346                gdouble         x2,
1347                gdouble         y2)
1348 {
1349   /* Adjust endpoints */
1350   if (y1 == y2)
1351     {
1352       y1 += 0.5;
1353       y2 += 0.5;
1354       x2 += 1;
1355     }
1356   else if (x1 == x2)
1357     {
1358       x1 += 0.5;
1359       x2 += 0.5;
1360       y2 += 1;
1361     }
1362
1363   cairo_move_to (cr, x1, y1);
1364   cairo_line_to (cr, x2, y2);
1365 }
1366
1367 static void
1368 color_shade (const GdkRGBA *color,
1369              gdouble        factor,
1370              GdkRGBA       *color_return)
1371 {
1372   GtkSymbolicColor *literal, *shade;
1373
1374   literal = gtk_symbolic_color_new_literal (color);
1375   shade = gtk_symbolic_color_new_shade (literal, factor);
1376   gtk_symbolic_color_unref (literal);
1377
1378   gtk_symbolic_color_resolve (shade, NULL, color_return);
1379   gtk_symbolic_color_unref (shade);
1380 }
1381
1382 static void
1383 _cairo_round_rectangle_sides (cairo_t          *cr,
1384                               gdouble           radius,
1385                               gdouble           x,
1386                               gdouble           y,
1387                               gdouble           width,
1388                               gdouble           height,
1389                               guint             sides,
1390                               GtkJunctionSides  junction)
1391 {
1392   radius = CLAMP (radius, 0, MIN (width / 2, height / 2));
1393
1394   if (sides & SIDE_RIGHT)
1395     {
1396       if (radius == 0 ||
1397           (junction & GTK_JUNCTION_CORNER_TOPRIGHT))
1398         cairo_move_to (cr, x + width, y);
1399       else
1400         {
1401           cairo_new_sub_path (cr);
1402           cairo_arc (cr, x + width - radius, y + radius, radius, - G_PI / 4, 0);
1403         }
1404
1405       if (radius == 0 ||
1406           (junction & GTK_JUNCTION_CORNER_BOTTOMRIGHT))
1407         cairo_line_to (cr, x + width, y + height);
1408       else
1409         cairo_arc (cr, x + width - radius, y + height - radius, radius, 0, G_PI / 4);
1410     }
1411
1412   if (sides & SIDE_BOTTOM)
1413     {
1414       if (radius != 0 &&
1415           ! (junction & GTK_JUNCTION_CORNER_BOTTOMRIGHT))
1416         {
1417           if ((sides & SIDE_RIGHT) == 0)
1418             cairo_new_sub_path (cr);
1419
1420           cairo_arc (cr, x + width - radius, y + height - radius, radius, G_PI / 4, G_PI / 2);
1421         }
1422       else if ((sides & SIDE_RIGHT) == 0)
1423         cairo_move_to (cr, x + width, y + height);
1424
1425       if (radius == 0 ||
1426           (junction & GTK_JUNCTION_CORNER_BOTTOMLEFT))
1427         cairo_line_to (cr, x, y + height);
1428       else
1429         cairo_arc (cr, x + radius, y + height - radius, radius, G_PI / 2, 3 * (G_PI / 4));
1430     }
1431   else
1432     cairo_move_to (cr, x, y + height);
1433
1434   if (sides & SIDE_LEFT)
1435     {
1436       if (radius != 0 &&
1437           ! (junction & GTK_JUNCTION_CORNER_BOTTOMLEFT))
1438         {
1439           if ((sides & SIDE_BOTTOM) == 0)
1440             cairo_new_sub_path (cr);
1441
1442           cairo_arc (cr, x + radius, y + height - radius, radius, 3 * (G_PI / 4), G_PI);
1443         }
1444       else if ((sides & SIDE_BOTTOM) == 0)
1445         cairo_move_to (cr, x, y + height);
1446
1447       if (radius == 0 ||
1448           (junction & GTK_JUNCTION_CORNER_TOPLEFT))
1449         cairo_line_to (cr, x, y);
1450       else
1451         cairo_arc (cr, x + radius, y + radius, radius, G_PI, G_PI + G_PI / 4);
1452     }
1453
1454   if (sides & SIDE_TOP)
1455     {
1456       if (radius != 0 &&
1457           ! (junction & GTK_JUNCTION_CORNER_TOPLEFT))
1458         {
1459           if ((sides & SIDE_LEFT) == 0)
1460             cairo_new_sub_path (cr);
1461
1462           cairo_arc (cr, x + radius, y + radius, radius, 5 * (G_PI / 4), 3 * (G_PI / 2));
1463         }
1464       else if ((sides & SIDE_LEFT) == 0)
1465         cairo_move_to (cr, x, y);
1466
1467       if (radius == 0 ||
1468           (junction & GTK_JUNCTION_CORNER_TOPRIGHT))
1469         cairo_line_to (cr, x + width, y);
1470       else
1471         cairo_arc (cr, x + width - radius, y + radius, radius, 3 * (G_PI / 2), - G_PI / 4);
1472     }
1473 }
1474
1475 static void
1476 render_background_internal (GtkThemingEngine *engine,
1477                             cairo_t          *cr,
1478                             gdouble           x,
1479                             gdouble           y,
1480                             gdouble           width,
1481                             gdouble           height,
1482                             GtkJunctionSides  junction)
1483 {
1484   GdkRGBA *bg_color;
1485   cairo_pattern_t *pattern;
1486   GtkStateFlags flags;
1487   gboolean running;
1488   gdouble progress, alpha = 1;
1489   gint radius;
1490
1491   flags = gtk_theming_engine_get_state (engine);
1492   cairo_save (cr);
1493
1494   gtk_theming_engine_get (engine, flags,
1495                           "background-image", &pattern,
1496                           "background-color", &bg_color,
1497                           "border-radius", &radius,
1498                           NULL);
1499
1500   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1501   _cairo_round_rectangle_sides (cr, (gdouble) radius,
1502                                 x, y, width, height,
1503                                 SIDE_ALL, junction);
1504   cairo_clip (cr);
1505
1506   if (gtk_theming_engine_has_class (engine, "background"))
1507     {
1508       cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0); /* transparent */
1509       cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
1510       cairo_paint (cr);
1511     }
1512
1513   cairo_translate (cr, x, y);
1514   cairo_scale (cr, width, height);
1515
1516   if (running)
1517     {
1518       cairo_pattern_t *other_pattern;
1519       GtkStateFlags other_flags;
1520       GdkRGBA *other_bg;
1521       cairo_pattern_t *new_pattern = NULL;
1522
1523       if (flags & GTK_STATE_FLAG_PRELIGHT)
1524         {
1525           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
1526           progress = 1 - progress;
1527         }
1528       else
1529         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
1530
1531       gtk_theming_engine_get (engine, other_flags,
1532                               "background-image", &other_pattern,
1533                               "background-color", &other_bg,
1534                               NULL);
1535
1536       if (pattern && other_pattern)
1537         {
1538           cairo_pattern_type_t type, other_type;
1539           gint n0, n1;
1540
1541           cairo_pattern_get_color_stop_count (pattern, &n0);
1542           cairo_pattern_get_color_stop_count (other_pattern, &n1);
1543           type = cairo_pattern_get_type (pattern);
1544           other_type = cairo_pattern_get_type (other_pattern);
1545
1546           if (type == other_type && n0 == n1)
1547             {
1548               gdouble offset0, red0, green0, blue0, alpha0;
1549               gdouble offset1, red1, green1, blue1, alpha1;
1550               gdouble x00, x01, y00, y01, x10, x11, y10, y11;
1551               gdouble r00, r01, r10, r11;
1552               guint i;
1553
1554               if (type == CAIRO_PATTERN_TYPE_LINEAR)
1555                 {
1556                   cairo_pattern_get_linear_points (pattern, &x00, &y00, &x01, &y01);
1557                   cairo_pattern_get_linear_points (other_pattern, &x10, &y10, &x11, &y11);
1558
1559                   new_pattern = cairo_pattern_create_linear (x00 + (x10 - x00) * progress,
1560                                                              y00 + (y10 - y00) * progress,
1561                                                              x01 + (x11 - x01) * progress,
1562                                                              y01 + (y11 - y01) * progress);
1563                 }
1564               else
1565                 {
1566                   cairo_pattern_get_radial_circles (pattern, &x00, &y00, &r00, &x01, &y01, &r01);
1567                   cairo_pattern_get_radial_circles (other_pattern, &x10, &y10, &r10, &x11, &y11, &r11);
1568
1569                   new_pattern = cairo_pattern_create_radial (x00 + (x10 - x00) * progress,
1570                                                              y00 + (y10 - y00) * progress,
1571                                                              r00 + (r10 - r00) * progress,
1572                                                              x01 + (x11 - x01) * progress,
1573                                                              y01 + (y11 - y01) * progress,
1574                                                              r01 + (r11 - r01) * progress);
1575                 }
1576
1577               cairo_pattern_set_filter (new_pattern, CAIRO_FILTER_FAST);
1578               i = 0;
1579
1580               /* Blend both gradients into one */
1581               while (i < n0 && i < n1)
1582                 {
1583                   cairo_pattern_get_color_stop_rgba (pattern, i,
1584                                                      &offset0,
1585                                                      &red0, &green0, &blue0,
1586                                                      &alpha0);
1587                   cairo_pattern_get_color_stop_rgba (other_pattern, i,
1588                                                      &offset1,
1589                                                      &red1, &green1, &blue1,
1590                                                      &alpha1);
1591
1592                   cairo_pattern_add_color_stop_rgba (new_pattern,
1593                                                      offset0 + ((offset1 - offset0) * progress),
1594                                                      red0 + ((red1 - red0) * progress),
1595                                                      green0 + ((green1 - green0) * progress),
1596                                                      blue0 + ((blue1 - blue0) * progress),
1597                                                      alpha0 + ((alpha1 - alpha0) * progress));
1598                   i++;
1599                 }
1600             }
1601           else
1602             {
1603               /* Different pattern types, or different color
1604                * stop counts, alpha blend both patterns.
1605                */
1606               cairo_rectangle (cr, 0, 0, 1, 1);
1607               cairo_set_source (cr, other_pattern);
1608               cairo_fill_preserve (cr);
1609
1610               /* Set alpha for posterior drawing
1611                * of the target pattern
1612                */
1613               alpha = 1 - progress;
1614             }
1615         }
1616       else if (pattern || other_pattern)
1617         {
1618           cairo_pattern_t *p;
1619           const GdkRGBA *c;
1620           gdouble x0, y0, x1, y1, r0, r1;
1621           gint n, i;
1622
1623           /* Blend a pattern with a color */
1624           if (pattern)
1625             {
1626               p = pattern;
1627               c = other_bg;
1628               progress = 1 - progress;
1629             }
1630           else
1631             {
1632               p = other_pattern;
1633               c = bg_color;
1634             }
1635
1636           if (cairo_pattern_get_type (p) == CAIRO_PATTERN_TYPE_LINEAR)
1637             {
1638               cairo_pattern_get_linear_points (p, &x0, &y0, &x1, &y1);
1639               new_pattern = cairo_pattern_create_linear (x0, y0, x1, y1);
1640             }
1641           else
1642             {
1643               cairo_pattern_get_radial_circles (p, &x0, &y0, &r0, &x1, &y1, &r1);
1644               new_pattern = cairo_pattern_create_radial (x0, y0, r0, x1, y1, r1);
1645             }
1646
1647           cairo_pattern_get_color_stop_count (p, &n);
1648
1649           for (i = 0; i < n; i++)
1650             {
1651               gdouble red1, green1, blue1, alpha1;
1652               gdouble offset;
1653
1654               cairo_pattern_get_color_stop_rgba (p, i,
1655                                                  &offset,
1656                                                  &red1, &green1, &blue1,
1657                                                  &alpha1);
1658               cairo_pattern_add_color_stop_rgba (new_pattern, offset,
1659                                                  c->red + ((red1 - c->red) * progress),
1660                                                  c->green + ((green1 - c->green) * progress),
1661                                                  c->blue + ((blue1 - c->blue) * progress),
1662                                                  c->alpha + ((alpha1 - c->alpha) * progress));
1663             }
1664         }
1665       else
1666         {
1667           const GdkRGBA *color, *other_color;
1668
1669           /* Merge just colors */
1670           color = bg_color;
1671           other_color = other_bg;
1672
1673           new_pattern = cairo_pattern_create_rgba (CLAMP (color->red + ((other_color->red - color->red) * progress), 0, 1),
1674                                                    CLAMP (color->green + ((other_color->green - color->green) * progress), 0, 1),
1675                                                    CLAMP (color->blue + ((other_color->blue - color->blue) * progress), 0, 1),
1676                                                    CLAMP (color->alpha + ((other_color->alpha - color->alpha) * progress), 0, 1));
1677         }
1678
1679       if (new_pattern)
1680         {
1681           /* Replace pattern to use */
1682           cairo_pattern_destroy (pattern);
1683           pattern = new_pattern;
1684         }
1685
1686       if (other_pattern)
1687         cairo_pattern_destroy (other_pattern);
1688
1689       if (other_bg)
1690         gdk_rgba_free (other_bg);
1691     }
1692
1693   cairo_rectangle (cr, 0, 0, 1, 1);
1694
1695   if (pattern)
1696     {
1697       cairo_set_source (cr, pattern);
1698       cairo_pattern_destroy (pattern);
1699     }
1700   else
1701     gdk_cairo_set_source_rgba (cr, bg_color);
1702
1703   if (alpha == 1)
1704     cairo_fill (cr);
1705   else
1706     {
1707       cairo_pattern_t *mask;
1708
1709       mask = cairo_pattern_create_rgba (1, 1, 1, alpha);
1710       cairo_mask (cr, mask);
1711       cairo_pattern_destroy (mask);
1712     }
1713
1714   cairo_restore (cr);
1715
1716   gdk_rgba_free (bg_color);
1717 }
1718
1719 static void
1720 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1721                                       cairo_t          *cr,
1722                                       gdouble           x,
1723                                       gdouble           y,
1724                                       gdouble           width,
1725                                       gdouble           height)
1726 {
1727   GtkJunctionSides junction;
1728   GtkStateFlags flags;
1729   GtkBorder *border;
1730
1731   junction = gtk_theming_engine_get_junction_sides (engine);
1732
1733   flags = gtk_theming_engine_get_state (engine);
1734   gtk_theming_engine_get (engine, flags,
1735                           "border-width", &border,
1736                           NULL);
1737
1738   x += border->left;
1739   y += border->top;
1740   width -= border->left + border->right;
1741   height -= border->top + border->bottom;
1742
1743   render_background_internal (engine, cr,
1744                               x, y, width, height,
1745                               junction);
1746
1747   gtk_border_free (border);
1748 }
1749
1750 /* Renders the small triangle on corners so
1751  * frames with 0 radius have a 3D-like effect
1752  */
1753 static void
1754 _cairo_corner_triangle (cairo_t *cr,
1755                         gdouble  x,
1756                         gdouble  y,
1757                         gint     size)
1758 {
1759   gint i;
1760
1761   cairo_move_to (cr, x + 0.5, y + size - 0.5);
1762   cairo_line_to (cr, x + size - 0.5, y + size - 0.5);
1763   cairo_line_to (cr, x + size - 0.5, y + 0.5);
1764
1765   for (i = 1; i < size - 1; i++)
1766     {
1767       cairo_move_to (cr, x + size - 0.5, y + i + 0.5);
1768       cairo_line_to (cr, x + (size - i) - 0.5, y + i + 0.5);
1769     }
1770 }
1771
1772 static void
1773 render_frame_internal (GtkThemingEngine *engine,
1774                        cairo_t          *cr,
1775                        gdouble           x,
1776                        gdouble           y,
1777                        gdouble           width,
1778                        gdouble           height,
1779                        guint             hidden_side,
1780                        GtkJunctionSides  junction)
1781 {
1782   GtkStateFlags state;
1783   GdkRGBA lighter;
1784   GdkRGBA *border_color;
1785   GtkBorderStyle border_style;
1786   gint border_width, radius;
1787   gdouble progress, d1, d2, m;
1788   gboolean running;
1789   GtkBorder *border;
1790
1791   state = gtk_theming_engine_get_state (engine);
1792   gtk_theming_engine_get (engine, state,
1793                           "border-color", &border_color,
1794                           "border-style", &border_style,
1795                           "border-width", &border,
1796                           "border-radius", &radius,
1797                           NULL);
1798
1799   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1800   border_width = MIN (MIN (border->top, border->bottom),
1801                       MIN (border->left, border->right));
1802
1803   if (running)
1804     {
1805       GtkStateFlags other_state;
1806       GdkRGBA *other_color;
1807
1808       if (state & GTK_STATE_FLAG_PRELIGHT)
1809         {
1810           other_state = state & ~(GTK_STATE_FLAG_PRELIGHT);
1811           progress = 1 - progress;
1812         }
1813       else
1814         other_state = state | GTK_STATE_FLAG_PRELIGHT;
1815
1816       gtk_theming_engine_get (engine, other_state,
1817                               "border-color", &other_color,
1818                               NULL);
1819
1820       border_color->red = CLAMP (border_color->red + ((other_color->red - border_color->red) * progress), 0, 1);
1821       border_color->green = CLAMP (border_color->green + ((other_color->green - border_color->green) * progress), 0, 1);
1822       border_color->blue = CLAMP (border_color->blue + ((other_color->blue - border_color->blue) * progress), 0, 1);
1823       border_color->alpha = CLAMP (border_color->alpha + ((other_color->alpha - border_color->alpha) * progress), 0, 1);
1824
1825       gdk_rgba_free (other_color);
1826     }
1827
1828   cairo_save (cr);
1829
1830   color_shade (border_color, 1.8, &lighter);
1831
1832   switch (border_style)
1833     {
1834     case GTK_BORDER_STYLE_NONE:
1835       break;
1836     case GTK_BORDER_STYLE_SOLID:
1837       cairo_set_line_width (cr, border_width);
1838       cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1839
1840       if (border_width > 1)
1841         {
1842           x += (gdouble) border_width / 2;
1843           y += (gdouble) border_width / 2;
1844           width -= border_width;
1845           height -= border_width;
1846         }
1847       else if (border_width == 1)
1848         {
1849           x += 0.5;
1850           y += 0.5;
1851           width -= 1;
1852           height -= 1;
1853         }
1854
1855       _cairo_round_rectangle_sides (cr, (gdouble) radius,
1856                                     x, y, width, height,
1857                                     SIDE_ALL & ~(hidden_side),
1858                                     junction);
1859       gdk_cairo_set_source_rgba (cr, border_color);
1860       cairo_stroke (cr);
1861
1862       break;
1863     case GTK_BORDER_STYLE_INSET:
1864     case GTK_BORDER_STYLE_OUTSET:
1865       cairo_set_line_width (cr, border_width);
1866
1867       if (radius == 0)
1868         cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1869       else
1870         cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
1871
1872       if (border_width > 1)
1873         {
1874           d1 = (gdouble) border_width / 2;
1875           d2 = border_width;
1876         }
1877       else
1878         {
1879           d1 = 0.5;
1880           d2 = 1;
1881         }
1882
1883       cairo_save (cr);
1884
1885       m = MIN (width, height);
1886       m /= 2;
1887
1888       if (border_style == GTK_BORDER_STYLE_INSET)
1889         gdk_cairo_set_source_rgba (cr, &lighter);
1890       else
1891         gdk_cairo_set_source_rgba (cr, border_color);
1892
1893       _cairo_round_rectangle_sides (cr, (gdouble) radius,
1894                                     x + d1, y + d1,
1895                                     width - d2, height - d2,
1896                                     (SIDE_BOTTOM | SIDE_RIGHT) & ~(hidden_side),
1897                                     junction);
1898       cairo_stroke (cr);
1899
1900       if (border_style == GTK_BORDER_STYLE_INSET)
1901         gdk_cairo_set_source_rgba (cr, border_color);
1902       else
1903         gdk_cairo_set_source_rgba (cr, &lighter);
1904
1905       _cairo_round_rectangle_sides (cr, (gdouble) radius,
1906                                     x + d1, y + d1,
1907                                     width - d2, height - d2,
1908                                     (SIDE_TOP | SIDE_LEFT) & ~(hidden_side),
1909                                     junction);
1910       cairo_stroke (cr);
1911
1912       if (border_width > 1)
1913         {
1914           /* overprint top/right and bottom/left corner
1915            * triangles if there are square corners there,
1916            * to give the box a 3D-like appearance.
1917            */
1918           cairo_save (cr);
1919
1920           if (border_style == GTK_BORDER_STYLE_INSET)
1921             gdk_cairo_set_source_rgba (cr, &lighter);
1922           else
1923             gdk_cairo_set_source_rgba (cr, border_color);
1924
1925           cairo_set_line_width (cr, 1);
1926
1927           if (radius == 0 ||
1928               (junction & GTK_JUNCTION_CORNER_TOPRIGHT) != 0)
1929             _cairo_corner_triangle (cr,
1930                                     x + width - border_width, y,
1931                                     border_width);
1932
1933           if (radius == 0 ||
1934               (junction & GTK_JUNCTION_CORNER_BOTTOMLEFT) != 0)
1935             _cairo_corner_triangle (cr,
1936                                     x, y + height - border_width,
1937                                     border_width);
1938           cairo_stroke (cr);
1939           cairo_restore (cr);
1940         }
1941
1942       cairo_restore (cr);
1943       break;
1944     }
1945
1946   cairo_restore (cr);
1947
1948   if (border_color)
1949     gdk_rgba_free (border_color);
1950
1951   gtk_border_free (border);
1952 }
1953
1954 static void
1955 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1956                                  cairo_t          *cr,
1957                                  gdouble           x,
1958                                  gdouble           y,
1959                                  gdouble           width,
1960                                  gdouble           height)
1961 {
1962   GtkStateFlags flags;
1963   Gtk9Slice *slice;
1964   GtkBorderStyle border_style;
1965   GtkJunctionSides junction;
1966
1967   flags = gtk_theming_engine_get_state (engine);
1968   junction = gtk_theming_engine_get_junction_sides (engine);
1969
1970   gtk_theming_engine_get (engine, flags,
1971                           "border-image", &slice,
1972                           "border-style", &border_style,
1973                           NULL);
1974
1975   if (slice)
1976     {
1977       _gtk_9slice_render (slice, cr, x, y, width, height);
1978       _gtk_9slice_unref (slice);
1979     }
1980   else if (border_style != GTK_BORDER_STYLE_NONE)
1981     render_frame_internal (engine, cr,
1982                            x, y, width, height,
1983                            0, junction);
1984 }
1985
1986 static void
1987 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1988                                     cairo_t          *cr,
1989                                     gdouble           x,
1990                                     gdouble           y,
1991                                     gdouble           width,
1992                                     gdouble           height)
1993 {
1994   GtkStateFlags flags;
1995   GdkRGBA *outline_color, *fg_color;
1996   double vertical_overshoot;
1997   int diameter;
1998   double radius;
1999   double interp;                /* interpolation factor for center position */
2000   double x_double_horz, y_double_horz;
2001   double x_double_vert, y_double_vert;
2002   double x_double, y_double;
2003   gdouble angle;
2004   gint line_width;
2005   gboolean running, is_rtl;
2006   gdouble progress;
2007
2008   cairo_save (cr);
2009   flags = gtk_theming_engine_get_state (engine);
2010
2011   gtk_theming_engine_get (engine, flags,
2012                           "color", &fg_color,
2013                           NULL);
2014   gtk_theming_engine_get (engine, flags,
2015                           "border-color", &outline_color,
2016                           NULL);
2017
2018   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
2019   is_rtl = (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL);
2020   line_width = 1;
2021
2022   if (!running)
2023     progress = (flags & GTK_STATE_FLAG_ACTIVE) ? 1 : 0;
2024
2025   if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_HORIZONTAL))
2026     {
2027       if (is_rtl)
2028         angle = (G_PI) - ((G_PI / 2) * progress);
2029       else
2030         angle = (G_PI / 2) * progress;
2031     }
2032   else
2033     {
2034       if (is_rtl)
2035         angle = (G_PI / 2) + ((G_PI / 2) * progress);
2036       else
2037         angle = (G_PI / 2) - ((G_PI / 2) * progress);
2038     }
2039
2040   interp = progress;
2041
2042   /* Compute distance that the stroke extends beyonds the end
2043    * of the triangle we draw.
2044    */
2045   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
2046
2047   /* For odd line widths, we end the vertical line of the triangle
2048    * at a half pixel, so we round differently.
2049    */
2050   if (line_width % 2 == 1)
2051     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
2052   else
2053     vertical_overshoot = ceil (vertical_overshoot);
2054
2055   /* Adjust the size of the triangle we draw so that the entire stroke fits
2056    */
2057   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
2058
2059   /* If the line width is odd, we want the diameter to be even,
2060    * and vice versa, so force the sum to be odd. This relationship
2061    * makes the point of the triangle look right.
2062    */
2063   diameter -= (1 - (diameter + line_width) % 2);
2064
2065   radius = diameter / 2.;
2066
2067   /* Adjust the center so that the stroke is properly aligned with
2068    * the pixel grid. The center adjustment is different for the
2069    * horizontal and vertical orientations. For intermediate positions
2070    * we interpolate between the two.
2071    */
2072   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
2073   y_double_vert = (y + height / 2) - 0.5;
2074
2075   x_double_horz = (x + width / 2) - 0.5;
2076   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
2077
2078   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
2079   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
2080
2081   cairo_translate (cr, x_double, y_double);
2082   cairo_rotate (cr, angle);
2083
2084   cairo_move_to (cr, - radius / 2., - radius);
2085   cairo_line_to (cr,   radius / 2.,   0);
2086   cairo_line_to (cr, - radius / 2.,   radius);
2087   cairo_close_path (cr);
2088
2089   cairo_set_line_width (cr, line_width);
2090
2091   gdk_cairo_set_source_rgba (cr, fg_color);
2092
2093   cairo_fill_preserve (cr);
2094
2095   gdk_cairo_set_source_rgba (cr, outline_color);
2096   cairo_stroke (cr);
2097
2098   cairo_restore (cr);
2099
2100   gdk_rgba_free (fg_color);
2101   gdk_rgba_free (outline_color);
2102 }
2103
2104 static void
2105 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
2106                                  cairo_t          *cr,
2107                                  gdouble           x,
2108                                  gdouble           y,
2109                                  gdouble           width,
2110                                  gdouble           height)
2111 {
2112   GtkStateFlags flags;
2113   GdkRGBA *color;
2114   gint line_width;
2115   gint8 *dash_list;
2116
2117   cairo_save (cr);
2118   flags = gtk_theming_engine_get_state (engine);
2119
2120   gtk_theming_engine_get (engine, flags,
2121                           "color", &color,
2122                           NULL);
2123
2124   gtk_theming_engine_get_style (engine,
2125                                 "focus-line-width", &line_width,
2126                                 "focus-line-pattern", (gchar *) &dash_list,
2127                                 NULL);
2128
2129   cairo_set_line_width (cr, (gdouble) line_width);
2130
2131   if (dash_list[0])
2132     {
2133       gint n_dashes = strlen ((const gchar *) dash_list);
2134       gdouble *dashes = g_new (gdouble, n_dashes);
2135       gdouble total_length = 0;
2136       gdouble dash_offset;
2137       gint i;
2138
2139       for (i = 0; i < n_dashes; i++)
2140         {
2141           dashes[i] = dash_list[i];
2142           total_length += dash_list[i];
2143         }
2144
2145       /* The dash offset here aligns the pattern to integer pixels
2146        * by starting the dash at the right side of the left border
2147        * Negative dash offsets in cairo don't work
2148        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
2149        */
2150       dash_offset = - line_width / 2.;
2151
2152       while (dash_offset < 0)
2153         dash_offset += total_length;
2154
2155       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
2156       g_free (dashes);
2157     }
2158
2159   cairo_rectangle (cr,
2160                    x + line_width / 2.,
2161                    y + line_width / 2.,
2162                    width - line_width,
2163                    height - line_width);
2164
2165   gdk_cairo_set_source_rgba (cr, color);
2166   cairo_stroke (cr);
2167
2168   cairo_restore (cr);
2169
2170   gdk_rgba_free (color);
2171   g_free (dash_list);
2172 }
2173
2174 static void
2175 gtk_theming_engine_render_line (GtkThemingEngine *engine,
2176                                 cairo_t          *cr,
2177                                 gdouble           x0,
2178                                 gdouble           y0,
2179                                 gdouble           x1,
2180                                 gdouble           y1)
2181 {
2182   GdkRGBA *bg_color, darker, lighter;
2183   GtkStateFlags flags;
2184   gint i, thickness, thickness_dark, thickness_light, len;
2185   cairo_matrix_t matrix;
2186   gdouble angle;
2187
2188   /* FIXME: thickness */
2189   thickness = 2;
2190   thickness_dark = thickness / 2;
2191   thickness_light = thickness - thickness_dark;
2192
2193   flags = gtk_theming_engine_get_state (engine);
2194   cairo_save (cr);
2195
2196   gtk_theming_engine_get (engine, flags,
2197                           "background-color", &bg_color,
2198                           NULL);
2199   color_shade (bg_color, 0.7, &darker);
2200   color_shade (bg_color, 1.3, &lighter);
2201
2202   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
2203   cairo_set_line_width (cr, 1);
2204
2205   angle = atan2 (x1 - x0, y1 - y0);
2206   angle = (2 * G_PI) - angle;
2207   angle += G_PI / 2;
2208
2209   cairo_get_matrix (cr, &matrix);
2210   cairo_matrix_translate (&matrix, x0, y0);
2211   cairo_matrix_rotate (&matrix, angle);
2212   cairo_set_matrix (cr, &matrix);
2213
2214   x1 -= x0;
2215   y1 -= y0;
2216
2217   len = (gint) sqrt ((x1 * x1) + (y1 * y1));
2218
2219   y0 = -thickness_dark;
2220
2221   for (i = 0; i < thickness_dark; i++)
2222     {
2223       gdk_cairo_set_source_rgba (cr, &lighter);
2224       add_path_line (cr, len - i - 1.5, y0, len - 0.5, y0);
2225       cairo_stroke (cr);
2226
2227       gdk_cairo_set_source_rgba (cr, &darker);
2228       add_path_line (cr, 0.5, y0, len - i - 1.5, y0);
2229       cairo_stroke (cr);
2230
2231       y0++;
2232     }
2233
2234   for (i = 0; i < thickness_light; i++)
2235     {
2236       gdk_cairo_set_source_rgba (cr, &darker);
2237       add_path_line (cr, 0.5, y0, thickness_light - i + 0.5, y0);
2238       cairo_stroke (cr);
2239
2240       gdk_cairo_set_source_rgba (cr, &lighter);
2241       add_path_line (cr, thickness_light - i + 0.5, y0, len - 0.5, y0);
2242       cairo_stroke (cr);
2243
2244       y0++;
2245     }
2246
2247   cairo_restore (cr);
2248
2249   gdk_rgba_free (bg_color);
2250 }
2251
2252 static void
2253 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2254                                   cairo_t          *cr,
2255                                   gdouble           x,
2256                                   gdouble           y,
2257                                   PangoLayout      *layout)
2258 {
2259   const PangoMatrix *matrix;
2260   GdkRGBA *fg_color;
2261   GtkStateFlags flags;
2262   gdouble progress;
2263   gboolean running;
2264
2265   cairo_save (cr);
2266   flags = gtk_theming_engine_get_state (engine);
2267
2268   gtk_theming_engine_get (engine, flags,
2269                           "color", &fg_color,
2270                           NULL);
2271
2272   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2273
2274   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
2275
2276   if (running)
2277     {
2278       GtkStateFlags other_flags;
2279       GdkRGBA *other_fg;
2280
2281       if (flags & GTK_STATE_FLAG_PRELIGHT)
2282         {
2283           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
2284           progress = 1 - progress;
2285         }
2286       else
2287         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
2288
2289       gtk_theming_engine_get (engine, other_flags,
2290                               "color", &other_fg,
2291                               NULL);
2292
2293       if (fg_color && other_fg)
2294         {
2295           fg_color->red = CLAMP (fg_color->red + ((other_fg->red - fg_color->red) * progress), 0, 1);
2296           fg_color->green = CLAMP (fg_color->green + ((other_fg->green - fg_color->green) * progress), 0, 1);
2297           fg_color->blue = CLAMP (fg_color->blue + ((other_fg->blue - fg_color->blue) * progress), 0, 1);
2298           fg_color->alpha = CLAMP (fg_color->alpha + ((other_fg->alpha - fg_color->alpha) * progress), 0, 1);
2299         }
2300
2301       if (other_fg)
2302         gdk_rgba_free (other_fg);
2303     }
2304
2305   if (matrix)
2306     {
2307       cairo_matrix_t cairo_matrix;
2308       PangoRectangle rect;
2309
2310       cairo_matrix_init (&cairo_matrix,
2311                          matrix->xx, matrix->yx,
2312                          matrix->xy, matrix->yy,
2313                          matrix->x0, matrix->y0);
2314
2315       pango_layout_get_extents (layout, NULL, &rect);
2316       pango_matrix_transform_rectangle (matrix, &rect);
2317       pango_extents_to_pixels (&rect, NULL);
2318
2319       cairo_matrix.x0 += x - rect.x;
2320       cairo_matrix.y0 += y - rect.y;
2321
2322       cairo_set_matrix (cr, &cairo_matrix);
2323     }
2324   else
2325     cairo_move_to (cr, x, y);
2326
2327   if (flags & GTK_STATE_FLAG_INSENSITIVE)
2328     {
2329       cairo_save (cr);
2330       cairo_set_source_rgb (cr, 1, 1, 1);
2331       cairo_move_to (cr, x + 1, y + 1);
2332       _gtk_pango_fill_layout (cr, layout);
2333       cairo_restore (cr);
2334     }
2335
2336   gdk_cairo_set_source_rgba (cr, fg_color);
2337   pango_cairo_show_layout (cr, layout);
2338
2339   cairo_restore (cr);
2340
2341   gdk_rgba_free (fg_color);
2342 }
2343
2344 static void
2345 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2346                                   cairo_t          *cr,
2347                                   gdouble           x,
2348                                   gdouble           y,
2349                                   gdouble           width,
2350                                   gdouble           height,
2351                                   GtkOrientation    orientation)
2352 {
2353   const GtkWidgetPath *path;
2354   gint thickness;
2355
2356   path = gtk_theming_engine_get_path (engine);
2357
2358   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2359   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2360
2361   /* FIXME: thickness */
2362   thickness = 2;
2363
2364   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
2365     {
2366       if (orientation == GTK_ORIENTATION_VERTICAL)
2367         gtk_theming_engine_render_line (engine, cr,
2368                                         x + thickness,
2369                                         y + (gint) height / 2,
2370                                         x + width - thickness - 1,
2371                                         y + (gint) height / 2);
2372       else
2373         gtk_theming_engine_render_line (engine, cr,
2374                                         x + (gint) width / 2,
2375                                         y + thickness,
2376                                         x + (gint) width / 2,
2377                                         y + height - thickness - 1);
2378     }
2379 }
2380
2381 static void
2382 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2383                                      cairo_t          *cr,
2384                                      gdouble           x,
2385                                      gdouble           y,
2386                                      gdouble           width,
2387                                      gdouble           height,
2388                                      GtkPositionType   gap_side,
2389                                      gdouble           xy0_gap,
2390                                      gdouble           xy1_gap)
2391 {
2392   GtkJunctionSides junction;
2393   GtkStateFlags state;
2394   gint border_width, radius;
2395   gdouble x0, y0, x1, y1, xc, yc, wc, hc;
2396   GtkBorder *border;
2397
2398   xc = yc = wc = hc = 0;
2399   state = gtk_theming_engine_get_state (engine);
2400   junction = gtk_theming_engine_get_junction_sides (engine);
2401   gtk_theming_engine_get (engine, state,
2402                           "border-width", &border,
2403                           "border-radius", &radius,
2404                           NULL);
2405
2406   border_width = MIN (MIN (border->top, border->bottom),
2407                       MIN (border->left, border->right));
2408
2409   cairo_save (cr);
2410
2411   switch (gap_side)
2412     {
2413     case GTK_POS_TOP:
2414       xc = x + xy0_gap + border_width;
2415       yc = y;
2416       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2417       hc = border_width;
2418
2419       if (xy0_gap < radius)
2420         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2421
2422       if (xy1_gap > width - radius)
2423         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2424       break;
2425     case GTK_POS_BOTTOM:
2426       xc = x + xy0_gap + border_width;
2427       yc = y + height - border_width;
2428       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2429       hc = border_width;
2430
2431       if (xy0_gap < radius)
2432         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2433
2434       if (xy1_gap > width - radius)
2435         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2436
2437       break;
2438     case GTK_POS_LEFT:
2439       xc = x;
2440       yc = y + xy0_gap + border_width;
2441       wc = border_width;
2442       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2443
2444       if (xy0_gap < radius)
2445         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2446
2447       if (xy1_gap > height - radius)
2448         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2449
2450       break;
2451     case GTK_POS_RIGHT:
2452       xc = x + width - border_width;
2453       yc = y + xy0_gap + border_width;
2454       wc = border_width;
2455       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2456
2457       if (xy0_gap < radius)
2458         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2459
2460       if (xy1_gap > height - radius)
2461         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2462
2463       break;
2464     }
2465
2466   cairo_clip_extents (cr, &x0, &y0, &x1, &y1);
2467   cairo_rectangle (cr, x0, y0, x1 - x0, yc - y0);
2468   cairo_rectangle (cr, x0, yc, xc - x0, hc);
2469   cairo_rectangle (cr, xc + wc, yc, x1 - (xc + wc), hc);
2470   cairo_rectangle (cr, x0, yc + hc, x1 - x0, y1 - (yc + hc));
2471   cairo_clip (cr);
2472
2473   render_frame_internal (engine, cr,
2474                          x, y, width, height,
2475                          0, junction);
2476
2477   cairo_restore (cr);
2478
2479   gtk_border_free (border);
2480 }
2481
2482 static void
2483 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2484                                      cairo_t          *cr,
2485                                      gdouble           x,
2486                                      gdouble           y,
2487                                      gdouble           width,
2488                                      gdouble           height,
2489                                      GtkPositionType   gap_side)
2490 {
2491   GtkJunctionSides junction = 0;
2492   guint hidden_side = 0;
2493
2494   cairo_save (cr);
2495
2496   switch (gap_side)
2497     {
2498     case GTK_POS_LEFT:
2499       junction = GTK_JUNCTION_LEFT;
2500       hidden_side = SIDE_LEFT;
2501
2502       cairo_translate (cr, x + width, y);
2503       cairo_rotate (cr, G_PI / 2);
2504       break;
2505     case GTK_POS_RIGHT:
2506       junction = GTK_JUNCTION_RIGHT;
2507       hidden_side = SIDE_RIGHT;
2508
2509       cairo_translate (cr, x, y + height);
2510       cairo_rotate (cr, - G_PI / 2);
2511       break;
2512     case GTK_POS_TOP:
2513       junction = GTK_JUNCTION_TOP;
2514       hidden_side = SIDE_TOP;
2515
2516       cairo_translate (cr, x + width, y + height);
2517       cairo_rotate (cr, G_PI);
2518       break;
2519     case GTK_POS_BOTTOM:
2520       junction = GTK_JUNCTION_BOTTOM;
2521       hidden_side = SIDE_BOTTOM;
2522
2523       cairo_translate (cr, x, y);
2524       break;
2525     }
2526
2527   if (gap_side == GTK_POS_TOP ||
2528       gap_side == GTK_POS_BOTTOM)
2529     render_background_internal (engine, cr,
2530                                 0, 0, width, height,
2531                                 GTK_JUNCTION_BOTTOM);
2532   else
2533     render_background_internal (engine, cr,
2534                                 0, 0, height, width,
2535                                 GTK_JUNCTION_BOTTOM);
2536   cairo_restore (cr);
2537
2538   cairo_save (cr);
2539
2540   render_frame_internal (engine, cr,
2541                          x, y, width, height,
2542                          hidden_side, junction);
2543
2544   cairo_restore (cr);
2545 }
2546
2547 static void
2548 render_dot (cairo_t       *cr,
2549             const GdkRGBA *lighter,
2550             const GdkRGBA *darker,
2551             gdouble        x,
2552             gdouble        y,
2553             gdouble        size)
2554 {
2555   size = CLAMP ((gint) size, 2, 3);
2556
2557   if (size == 2)
2558     {
2559       gdk_cairo_set_source_rgba (cr, lighter);
2560       cairo_rectangle (cr, x, y, 1, 1);
2561       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2562       cairo_fill (cr);
2563     }
2564   else if (size == 3)
2565     {
2566       gdk_cairo_set_source_rgba (cr, lighter);
2567       cairo_rectangle (cr, x, y, 2, 1);
2568       cairo_rectangle (cr, x, y, 1, 2);
2569       cairo_fill (cr);
2570
2571       gdk_cairo_set_source_rgba (cr, darker);
2572       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2573       cairo_rectangle (cr, x + 2, y, 1, 2);
2574       cairo_fill (cr);
2575     }
2576 }
2577
2578 static void
2579 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2580                                   cairo_t          *cr,
2581                                   gdouble           x,
2582                                   gdouble           y,
2583                                   gdouble           width,
2584                                   gdouble           height)
2585 {
2586   GtkStateFlags flags;
2587   GdkRGBA *bg_color;
2588   GdkRGBA lighter, darker;
2589   gint xx, yy;
2590
2591   cairo_save (cr);
2592   flags = gtk_theming_engine_get_state (engine);
2593
2594   cairo_set_line_width (cr, 1);
2595
2596   gtk_theming_engine_get (engine, flags,
2597                           "background-color", &bg_color,
2598                           NULL);
2599   color_shade (bg_color, 0.7, &darker);
2600   color_shade (bg_color, 1.3, &lighter);
2601
2602   gdk_cairo_set_source_rgba (cr, bg_color);
2603   cairo_rectangle (cr, x, y, width, height);
2604   cairo_fill (cr);
2605
2606   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_GRIP))
2607     {
2608       GtkJunctionSides sides;
2609
2610       cairo_save (cr);
2611
2612       cairo_set_line_width (cr, 1.0);
2613       sides = gtk_theming_engine_get_junction_sides (engine);
2614
2615       /* reduce confusing values to a meaningful state */
2616       if ((sides & (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)) == (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT))
2617         sides &= ~GTK_JUNCTION_CORNER_TOPLEFT;
2618
2619       if ((sides & (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT)) == (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT))
2620         sides &= ~GTK_JUNCTION_CORNER_TOPRIGHT;
2621
2622       if (sides == 0)
2623         sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2624
2625       /* align drawing area to the connected side */
2626       if (sides == GTK_JUNCTION_LEFT)
2627         {
2628           if (height < width)
2629             width = height;
2630         }
2631       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2632         {
2633           if (width < height)
2634             height = width;
2635           else if (height < width)
2636             width = height;
2637         }
2638       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2639         {
2640           /* make it square, aligning to bottom left */
2641           if (width < height)
2642             {
2643               y += (height - width);
2644               height = width;
2645             }
2646           else if (height < width)
2647             width = height;
2648         }
2649       else if (sides == GTK_JUNCTION_RIGHT)
2650         {
2651           /* aligning to right */
2652           if (height < width)
2653             {
2654               x += (width - height);
2655               width = height;
2656             }
2657         }
2658       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2659         {
2660           if (width < height)
2661             height = width;
2662           else if (height < width)
2663             {
2664               x += (width - height);
2665               width = height;
2666             }
2667         }
2668       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2669         {
2670           /* make it square, aligning to bottom right */
2671           if (width < height)
2672             {
2673               y += (height - width);
2674               height = width;
2675             }
2676           else if (height < width)
2677             {
2678               x += (width - height);
2679               width = height;
2680             }
2681         }
2682       else if (sides == GTK_JUNCTION_TOP)
2683         {
2684           if (width < height)
2685             height = width;
2686         }
2687       else if (sides == GTK_JUNCTION_BOTTOM)
2688         {
2689           /* align to bottom */
2690           if (width < height)
2691             {
2692               y += (height - width);
2693               height = width;
2694             }
2695         }
2696       else
2697         g_assert_not_reached ();
2698
2699       if (sides == GTK_JUNCTION_LEFT ||
2700           sides == GTK_JUNCTION_RIGHT)
2701         {
2702           gint xi;
2703
2704           xi = x;
2705
2706           while (xi < x + width)
2707             {
2708               gdk_cairo_set_source_rgba (cr, &lighter);
2709               add_path_line (cr, x, y, x, y + height);
2710               cairo_stroke (cr);
2711               xi++;
2712
2713               gdk_cairo_set_source_rgba (cr, &darker);
2714               add_path_line (cr, xi, y, xi, y + height);
2715               cairo_stroke (cr);
2716               xi += 2;
2717             }
2718         }
2719       else if (sides == GTK_JUNCTION_TOP ||
2720                sides == GTK_JUNCTION_BOTTOM)
2721         {
2722           gint yi;
2723
2724           yi = y;
2725
2726           while (yi < y + height)
2727             {
2728               gdk_cairo_set_source_rgba (cr, &lighter);
2729               add_path_line (cr, x, yi, x + width, yi);
2730               cairo_stroke (cr);
2731               yi++;
2732
2733               gdk_cairo_set_source_rgba (cr, &darker);
2734               add_path_line (cr, x, yi, x + width, yi);
2735               cairo_stroke (cr);
2736               yi += 2;
2737             }
2738         }
2739       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2740         {
2741           gint xi, yi;
2742
2743           xi = x + width;
2744           yi = y + height;
2745
2746           while (xi > x + 3)
2747             {
2748               gdk_cairo_set_source_rgba (cr, &darker);
2749               add_path_line (cr, xi, y, x, yi);
2750               cairo_stroke (cr);
2751
2752               --xi;
2753               --yi;
2754
2755               add_path_line (cr, xi, y, x, yi);
2756               cairo_stroke (cr);
2757
2758               --xi;
2759               --yi;
2760
2761               gdk_cairo_set_source_rgba (cr, &lighter);
2762               add_path_line (cr, xi, y, x, yi);
2763               cairo_stroke (cr);
2764
2765               xi -= 3;
2766               yi -= 3;
2767             }
2768         }
2769       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2770         {
2771           gint xi, yi;
2772
2773           xi = x;
2774           yi = y + height;
2775
2776           while (xi < (x + width - 3))
2777             {
2778               gdk_cairo_set_source_rgba (cr, &lighter);
2779               add_path_line (cr, xi, y, x + width, yi);
2780               cairo_stroke (cr);
2781
2782               ++xi;
2783               --yi;
2784
2785               gdk_cairo_set_source_rgba (cr, &darker);
2786               add_path_line (cr, xi, y, x + width, yi);
2787               cairo_stroke (cr);
2788
2789               ++xi;
2790               --yi;
2791
2792               add_path_line (cr, xi, y, x + width, yi);
2793               cairo_stroke (cr);
2794
2795               xi += 3;
2796               yi -= 3;
2797             }
2798         }
2799       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2800         {
2801           gint xi, yi;
2802
2803           xi = x + width;
2804           yi = y;
2805
2806           while (xi > x + 3)
2807             {
2808               gdk_cairo_set_source_rgba (cr, &darker);
2809               add_path_line (cr, x, yi, xi, y + height);
2810               cairo_stroke (cr);
2811
2812               --xi;
2813               ++yi;
2814
2815               add_path_line (cr, x, yi, xi, y + height);
2816               cairo_stroke (cr);
2817
2818               --xi;
2819               ++yi;
2820
2821               gdk_cairo_set_source_rgba (cr, &lighter);
2822               add_path_line (cr, x, yi, xi, y + height);
2823               cairo_stroke (cr);
2824
2825               xi -= 3;
2826               yi += 3;
2827             }
2828         }
2829       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2830         {
2831           gint xi, yi;
2832
2833           xi = x;
2834           yi = y;
2835
2836           while (xi < (x + width - 3))
2837             {
2838               gdk_cairo_set_source_rgba (cr, &lighter);
2839               add_path_line (cr, xi, y + height, x + width, yi);
2840               cairo_stroke (cr);
2841
2842               ++xi;
2843               ++yi;
2844
2845               gdk_cairo_set_source_rgba (cr, &darker);
2846               add_path_line (cr, xi, y + height, x + width, yi);
2847               cairo_stroke (cr);
2848
2849               ++xi;
2850               ++yi;
2851
2852               add_path_line (cr, xi, y + height, x + width, yi);
2853               cairo_stroke (cr);
2854
2855               xi += 3;
2856               yi += 3;
2857             }
2858         }
2859
2860       cairo_restore (cr);
2861     }
2862   else if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_PANE_SEPARATOR))
2863     {
2864       if (width > height)
2865         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2866           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2867       else
2868         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2869           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2870     }
2871   else
2872     {
2873       for (yy = y; yy < y + height; yy += 3)
2874         for (xx = x; xx < x + width; xx += 6)
2875           {
2876             render_dot (cr, &lighter, &darker, xx, yy, 2);
2877             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2878           }
2879     }
2880
2881   cairo_restore (cr);
2882
2883   gdk_rgba_free (bg_color);
2884 }
2885
2886 static void
2887 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2888                                     cairo_t          *cr,
2889                                     gdouble           x,
2890                                     gdouble           y,
2891                                     gdouble           width,
2892                                     gdouble           height)
2893 {
2894   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
2895     {
2896       GtkStateFlags state;
2897       guint num_steps, step;
2898       GdkRGBA *color;
2899       gdouble dx, dy;
2900       gdouble progress;
2901       gdouble radius;
2902       gdouble half;
2903       gint i;
2904
2905       num_steps = 12;
2906
2907       state = gtk_theming_engine_get_state (engine);
2908       gtk_theming_engine_get (engine, state,
2909                               "color", &color,
2910                               NULL);
2911
2912       if (gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
2913         step = (guint) (progress * num_steps);
2914       else
2915         step = 0;
2916
2917       cairo_save (cr);
2918
2919       cairo_translate (cr, x, y);
2920
2921       /* draw clip region */
2922       cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2923
2924       dx = width / 2;
2925       dy = height / 2;
2926       radius = MIN (width / 2, height / 2);
2927       half = num_steps / 2;
2928
2929       for (i = 0; i < num_steps; i++)
2930         {
2931           gint inset = 0.7 * radius;
2932
2933           /* transparency is a function of time and intial value */
2934           gdouble t = (gdouble) ((i + num_steps - step)
2935                                  % num_steps) / num_steps;
2936
2937           cairo_save (cr);
2938
2939           cairo_set_source_rgba (cr,
2940                                  color->red,
2941                                  color->green,
2942                                  color->blue,
2943                                  color->alpha * t);
2944
2945           cairo_set_line_width (cr, 2.0);
2946           cairo_move_to (cr,
2947                          dx + (radius - inset) * cos (i * G_PI / half),
2948                          dy + (radius - inset) * sin (i * G_PI / half));
2949           cairo_line_to (cr,
2950                          dx + radius * cos (i * G_PI / half),
2951                          dy + radius * sin (i * G_PI / half));
2952           cairo_stroke (cr);
2953
2954           cairo_restore (cr);
2955         }
2956
2957       cairo_restore (cr);
2958
2959       gdk_rgba_free (color);
2960     }
2961   else
2962     {
2963       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2964       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2965     }
2966 }
2967
2968 static GdkPixbuf *
2969 scale_or_ref (GdkPixbuf *src,
2970               gint       width,
2971               gint       height)
2972 {
2973   if (width == gdk_pixbuf_get_width (src) &&
2974       height == gdk_pixbuf_get_height (src))
2975     return g_object_ref (src);
2976   else
2977     return gdk_pixbuf_scale_simple (src,
2978                                     width, height,
2979                                     GDK_INTERP_BILINEAR);
2980 }
2981
2982 static gboolean
2983 lookup_icon_size (GtkThemingEngine *engine,
2984                   GtkIconSize       size,
2985                   gint             *width,
2986                   gint             *height)
2987 {
2988   GdkScreen *screen;
2989   GtkSettings *settings;
2990
2991   screen = gtk_theming_engine_get_screen (engine);
2992   settings = gtk_settings_get_for_screen (screen);
2993
2994   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
2995 }
2996
2997 /* Kudos to the gnome-panel guys. */
2998 static void
2999 colorshift_pixbuf (GdkPixbuf *src,
3000                    GdkPixbuf *dest,
3001                    gint       shift)
3002 {
3003   gint i, j;
3004   gint width, height, has_alpha, src_rowstride, dest_rowstride;
3005   guchar *target_pixels;
3006   guchar *original_pixels;
3007   guchar *pix_src;
3008   guchar *pix_dest;
3009   int val;
3010   guchar r, g, b;
3011
3012   has_alpha       = gdk_pixbuf_get_has_alpha (src);
3013   width           = gdk_pixbuf_get_width (src);
3014   height          = gdk_pixbuf_get_height (src);
3015   src_rowstride   = gdk_pixbuf_get_rowstride (src);
3016   dest_rowstride  = gdk_pixbuf_get_rowstride (dest);
3017   original_pixels = gdk_pixbuf_get_pixels (src);
3018   target_pixels   = gdk_pixbuf_get_pixels (dest);
3019
3020   for (i = 0; i < height; i++)
3021     {
3022       pix_dest = target_pixels   + i * dest_rowstride;
3023       pix_src  = original_pixels + i * src_rowstride;
3024
3025       for (j = 0; j < width; j++)
3026         {
3027           r = *(pix_src++);
3028           g = *(pix_src++);
3029           b = *(pix_src++);
3030
3031           val = r + shift;
3032           *(pix_dest++) = CLAMP (val, 0, 255);
3033
3034           val = g + shift;
3035           *(pix_dest++) = CLAMP (val, 0, 255);
3036
3037           val = b + shift;
3038           *(pix_dest++) = CLAMP (val, 0, 255);
3039
3040           if (has_alpha)
3041             *(pix_dest++) = *(pix_src++);
3042         }
3043     }
3044 }
3045
3046 static GdkPixbuf *
3047 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
3048                                        const GtkIconSource *source,
3049                                        GtkIconSize          size)
3050 {
3051   GdkPixbuf *scaled;
3052   GdkPixbuf *stated;
3053   GdkPixbuf *base_pixbuf;
3054   GtkStateFlags state;
3055   gint width = 1;
3056   gint height = 1;
3057
3058   base_pixbuf = gtk_icon_source_get_pixbuf (source);
3059   state = gtk_theming_engine_get_state (engine);
3060
3061   g_return_val_if_fail (base_pixbuf != NULL, NULL);
3062
3063   if (size != (GtkIconSize) -1 &&
3064       !lookup_icon_size (engine, size, &width, &height))
3065     {
3066       g_warning (G_STRLOC ": invalid icon size '%d'", size);
3067       return NULL;
3068     }
3069
3070   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
3071    * leave it alone.
3072    */
3073   if (size != (GtkIconSize) -1 &&
3074       gtk_icon_source_get_size_wildcarded (source))
3075     scaled = scale_or_ref (base_pixbuf, width, height);
3076   else
3077     scaled = g_object_ref (base_pixbuf);
3078
3079   /* If the state was wildcarded, then generate a state. */
3080   if (gtk_icon_source_get_state_wildcarded (source))
3081     {
3082       if (state & GTK_STATE_FLAG_INSENSITIVE)
3083         {
3084           stated = gdk_pixbuf_copy (scaled);
3085           gdk_pixbuf_saturate_and_pixelate (scaled, stated,
3086                                             0.8, TRUE);
3087           g_object_unref (scaled);
3088         }
3089       else if (state & GTK_STATE_FLAG_PRELIGHT)
3090         {
3091           stated = gdk_pixbuf_copy (scaled);
3092           colorshift_pixbuf (scaled, stated, 30);
3093           g_object_unref (scaled);
3094         }
3095       else
3096         stated = scaled;
3097     }
3098   else
3099     stated = scaled;
3100
3101   return stated;
3102 }