Pileus Git - ~andy/gtk/blob - gtk/gtkthemingengine.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <math.h>
  23 #include <gtk/gtk.h>
  24
  25 #include <gtk/gtkthemingengine.h>
  26 #include <gtk/gtkstylecontext.h>
  27 #include <gtk/gtkintl.h>
  28
  29 #include "gtkprivate.h"
  30 #include "gtkborderimageprivate.h"
  31 #include "gtkpango.h"
  32 #include "gtkshadowprivate.h"
  33 #include "gtkcsstypesprivate.h"
  34 #include "gtkthemingengineprivate.h"
  35
  36 /**
  37  * SECTION:gtkthemingengine
  38  * @Short_description: Theming renderers
  39  * @Title: GtkThemingEngine
  40  * @See_also: #GtkStyleContext
  41  *
  42  * #GtkThemingEngine is the object used for rendering themed content
  43  * in GTK+ widgets. Even though GTK+ has a default implementation,
  44  * it can be overridden in CSS files by enforcing a #GtkThemingEngine
  45  * object to be loaded as a module.
  46  *
  47  * In order to implement a theming engine, a #GtkThemingEngine subclass
  48  * must be created, alongside the CSS file that will reference it, the
  49  * theming engine would be created as an .so library, and installed in
  50  * $(gtk-modules-dir)/theming-engines/.
  51  *
  52  * #GtkThemingEngine<!-- -->s have limited access to the object they are
  53  * rendering, the #GtkThemingEngine API has read-only accessors to the
  54  * style information contained in the rendered object's #GtkStyleContext.
  55  */
  56
  57 typedef struct GtkThemingEnginePrivate GtkThemingEnginePrivate;
  58
  59 enum {
  60   SIDE_LEFT   = 1,
  61   SIDE_BOTTOM = 1 << 1,
  62   SIDE_RIGHT  = 1 << 2,
  63   SIDE_TOP    = 1 << 3,
  64   SIDE_ALL    = 0xF
  65 };
  66
  67 enum {
  68   PROP_0,
  69   PROP_NAME
  70 };
  71
  72 struct GtkThemingEnginePrivate
  73 {
  74   GtkStyleContext *context;
  75   gchar *name;
  76 };
  77
  78 #define GTK_THEMING_ENGINE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_THEMING_ENGINE, GtkThemingEnginePrivate))
  79
  80 static void gtk_theming_engine_finalize          (GObject      *object);
  81 static void gtk_theming_engine_impl_set_property (GObject      *object,
  82                                                   guint         prop_id,
  83                                                   const GValue *value,
  84                                                   GParamSpec   *pspec);
  85 static void gtk_theming_engine_impl_get_property (GObject      *object,
  86                                                   guint         prop_id,
  87                                                   GValue       *value,
  88                                                   GParamSpec   *pspec);
  89
  90 static void gtk_theming_engine_render_check (GtkThemingEngine *engine,
  91                                              cairo_t          *cr,
  92                                              gdouble           x,
  93                                              gdouble           y,
  94                                              gdouble           width,
  95                                              gdouble           height);
  96 static void gtk_theming_engine_render_option (GtkThemingEngine *engine,
  97                                               cairo_t          *cr,
  98                                               gdouble           x,
  99                                               gdouble           y,
 100                                               gdouble           width,
 101                                               gdouble           height);
 102 static void gtk_theming_engine_render_arrow  (GtkThemingEngine *engine,
 103                                               cairo_t          *cr,
 104                                               gdouble           angle,
 105                                               gdouble           x,
 106                                               gdouble           y,
 107                                               gdouble           size);
 108 static void gtk_theming_engine_render_background (GtkThemingEngine *engine,
 109                                                   cairo_t          *cr,
 110                                                   gdouble           x,
 111                                                   gdouble           y,
 112                                                   gdouble           width,
 113                                                   gdouble           height);
 114 static void gtk_theming_engine_render_frame  (GtkThemingEngine *engine,
 115                                               cairo_t          *cr,
 116                                               gdouble           x,
 117                                               gdouble           y,
 118                                               gdouble           width,
 119                                               gdouble           height);
 120 static void gtk_theming_engine_render_expander (GtkThemingEngine *engine,
 121                                                 cairo_t          *cr,
 122                                                 gdouble           x,
 123                                                 gdouble           y,
 124                                                 gdouble           width,
 125                                                 gdouble           height);
 126 static void gtk_theming_engine_render_focus    (GtkThemingEngine *engine,
 127                                                 cairo_t          *cr,
 128                                                 gdouble           x,
 129                                                 gdouble           y,
 130                                                 gdouble           width,
 131                                                 gdouble           height);
 132 static void gtk_theming_engine_render_layout   (GtkThemingEngine *engine,
 133                                                 cairo_t          *cr,
 134                                                 gdouble           x,
 135                                                 gdouble           y,
 136                                                 PangoLayout      *layout);
 137 static void gtk_theming_engine_render_line     (GtkThemingEngine *engine,
 138                                                 cairo_t          *cr,
 139                                                 gdouble           x0,
 140                                                 gdouble           y0,
 141                                                 gdouble           x1,
 142                                                 gdouble           y1);
 143 static void gtk_theming_engine_render_slider   (GtkThemingEngine *engine,
 144                                                 cairo_t          *cr,
 145                                                 gdouble           x,
 146                                                 gdouble           y,
 147                                                 gdouble           width,
 148                                                 gdouble           height,
 149                                                 GtkOrientation    orientation);
 150 static void gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
 151                                                  cairo_t          *cr,
 152                                                  gdouble           x,
 153                                                  gdouble           y,
 154                                                  gdouble           width,
 155                                                  gdouble           height,
 156                                                  GtkPositionType   gap_side,
 157                                                  gdouble           xy0_gap,
 158                                                  gdouble           xy1_gap);
 159 static void gtk_theming_engine_render_extension (GtkThemingEngine *engine,
 160                                                  cairo_t          *cr,
 161                                                  gdouble           x,
 162                                                  gdouble           y,
 163                                                  gdouble           width,
 164                                                  gdouble           height,
 165                                                  GtkPositionType   gap_side);
 166 static void gtk_theming_engine_render_handle    (GtkThemingEngine *engine,
 167                                                  cairo_t          *cr,
 168                                                  gdouble           x,
 169                                                  gdouble           y,
 170                                                  gdouble           width,
 171                                                  gdouble           height);
 172 static void gtk_theming_engine_render_activity  (GtkThemingEngine *engine,
 173                                                  cairo_t          *cr,
 174                                                  gdouble           x,
 175                                                  gdouble           y,
 176                                                  gdouble           width,
 177                                                  gdouble           height);
 178 static GdkPixbuf * gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
 179                                                           const GtkIconSource *source,
 180                                                           GtkIconSize          size);
 181 static void gtk_theming_engine_render_icon (GtkThemingEngine *engine,
 182                                             cairo_t *cr,
 183                                             GdkPixbuf *pixbuf,
 184                                             gdouble x,
 185                                             gdouble y);
 186
 187 G_DEFINE_TYPE (GtkThemingEngine, gtk_theming_engine, G_TYPE_OBJECT)
 188
 189
 190 typedef struct GtkThemingModule GtkThemingModule;
 191 typedef struct GtkThemingModuleClass GtkThemingModuleClass;
 192
 193 struct GtkThemingModule
 194 {
 195   GTypeModule parent_instance;
 196   GModule *module;
 197   gchar *name;
 198
 199   void (*init) (GTypeModule *module);
 200   void (*exit) (void);
 201   GtkThemingEngine * (*create_engine) (void);
 202 };
 203
 204 struct GtkThemingModuleClass
 205 {
 206   GTypeModuleClass parent_class;
 207 };
 208
 209 #define GTK_TYPE_THEMING_MODULE  (gtk_theming_module_get_type ())
 210 #define GTK_THEMING_MODULE(o)    (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_THEMING_MODULE, GtkThemingModule))
 211 #define GTK_IS_THEMING_MODULE(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_THEMING_MODULE))
 212
 213 G_DEFINE_TYPE (GtkThemingModule, gtk_theming_module, G_TYPE_TYPE_MODULE);
 214
 215 static void
 216 gtk_theming_engine_class_init (GtkThemingEngineClass *klass)
 217 {
 218   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 219
 220   object_class->finalize = gtk_theming_engine_finalize;
 221   object_class->set_property = gtk_theming_engine_impl_set_property;
 222   object_class->get_property = gtk_theming_engine_impl_get_property;
 223
 224   klass->render_icon = gtk_theming_engine_render_icon;
 225   klass->render_check = gtk_theming_engine_render_check;
 226   klass->render_option = gtk_theming_engine_render_option;
 227   klass->render_arrow = gtk_theming_engine_render_arrow;
 228   klass->render_background = gtk_theming_engine_render_background;
 229   klass->render_frame = gtk_theming_engine_render_frame;
 230   klass->render_expander = gtk_theming_engine_render_expander;
 231   klass->render_focus = gtk_theming_engine_render_focus;
 232   klass->render_layout = gtk_theming_engine_render_layout;
 233   klass->render_line = gtk_theming_engine_render_line;
 234   klass->render_slider = gtk_theming_engine_render_slider;
 235   klass->render_frame_gap = gtk_theming_engine_render_frame_gap;
 236   klass->render_extension = gtk_theming_engine_render_extension;
 237   klass->render_handle = gtk_theming_engine_render_handle;
 238   klass->render_activity = gtk_theming_engine_render_activity;
 239   klass->render_icon_pixbuf = gtk_theming_engine_render_icon_pixbuf;
 240
 241   /**
 242    * GtkThemingEngine:name:
 243    *
 244    * The theming engine name, this name will be used when registering
 245    * custom properties, for a theming engine named "Clearlooks" registering
 246    * a "glossy" custom property, it could be referenced in the CSS file as
 247    *
 248    * <programlisting>
 249    * -Clearlooks-glossy: true;
 250    * </programlisting>
 251    *
 252    * Since: 3.0
 253    */
 254   g_object_class_install_property (object_class,
 255                                    PROP_NAME,
 256                                    g_param_spec_string ("name",
 257                                                         P_("Name"),
 258                                                         P_("Theming engine name"),
 259                                                         NULL,
 260                                                         G_PARAM_CONSTRUCT_ONLY | GTK_PARAM_READWRITE));
 261
 262   g_type_class_add_private (object_class, sizeof (GtkThemingEnginePrivate));
 263 }
 264
 265 static void
 266 gtk_theming_engine_init (GtkThemingEngine *engine)
 267 {
 268   engine->priv = GTK_THEMING_ENGINE_GET_PRIVATE (engine);
 269 }
 270
 271 static void
 272 gtk_theming_engine_finalize (GObject *object)
 273 {
 274   GtkThemingEnginePrivate *priv;
 275
 276   priv = GTK_THEMING_ENGINE (object)->priv;
 277   g_free (priv->name);
 278
 279   G_OBJECT_GET_CLASS (gtk_theming_engine_parent_class)->finalize (object);
 280 }
 281
 282 static void
 283 gtk_theming_engine_impl_set_property (GObject      *object,
 284                                       guint         prop_id,
 285                                       const GValue *value,
 286                                       GParamSpec   *pspec)
 287 {
 288   GtkThemingEnginePrivate *priv;
 289
 290   priv = GTK_THEMING_ENGINE (object)->priv;
 291
 292   switch (prop_id)
 293     {
 294     case PROP_NAME:
 295       if (priv->name)
 296         g_free (priv->name);
 297
 298       priv->name = g_value_dup_string (value);
 299       break;
 300     default:
 301       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 302       break;
 303     }
 304 }
 305
 306 static void
 307 gtk_theming_engine_impl_get_property (GObject    *object,
 308                                       guint       prop_id,
 309                                       GValue     *value,
 310                                       GParamSpec *pspec)
 311 {
 312   GtkThemingEnginePrivate *priv;
 313
 314   priv = GTK_THEMING_ENGINE (object)->priv;
 315
 316   switch (prop_id)
 317     {
 318     case PROP_NAME:
 319       g_value_set_string (value, priv->name);
 320       break;
 321     default:
 322       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 323       break;
 324     }
 325 }
 326
 327 void
 328 _gtk_theming_engine_set_context (GtkThemingEngine *engine,
 329                                  GtkStyleContext  *context)
 330 {
 331   GtkThemingEnginePrivate *priv;
 332
 333   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 334   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
 335
 336   priv = engine->priv;
 337   priv->context = context;
 338 }
 339
 340 /**
 341  * gtk_theming_engine_register_property: (skip)
 342  * @name_space: namespace for the property name
 343  * @parse_func: parsing function to use, or %NULL
 344  * @pspec: the #GParamSpec for the new property
 345  *
 346  * Registers a property so it can be used in the CSS file format,
 347  * on the CSS file the property will look like
 348  * "-${@name_space}-${property_name}". being
 349  * ${property_name} the given to @pspec. @name_space will usually
 350  * be the theme engine name.
 351  *
 352  * For any type a @parse_func may be provided, being this function
 353  * used for turning any property value (between ':' and ';') in
 354  * CSS to the #GValue needed. For basic types there is already
 355  * builtin parsing support, so %NULL may be provided for these
 356  * cases.
 357  *
 358  * <note>
 359  * Engines must ensure property registration happens exactly once,
 360  * usually GTK+ deals with theming engines as singletons, so this
 361  * should be guaranteed to happen once, but bear this in mind
 362  * when creating #GtkThemeEngine<!-- -->s yourself.
 363  * </note>
 364  *
 365  * <note>
 366  * In order to make use of the custom registered properties in
 367  * the CSS file, make sure the engine is loaded first by specifying
 368  * the engine property, either in a previous rule or within the same
 369  * one.
 370  * <programlisting>
 371  * &ast; {
 372  *     engine: someengine;
 373  *     -SomeEngine-custom-property: 2;
 374  * }
 375  * </programlisting>
 376  * </note>
 377  *
 378  * Since: 3.0
 379  **/
 380 void
 381 gtk_theming_engine_register_property (const gchar            *name_space,
 382                                       GtkStylePropertyParser  parse_func,
 383                                       GParamSpec             *pspec)
 384 {
 385   gchar *name;
 386
 387   g_return_if_fail (name_space != NULL);
 388   g_return_if_fail (strchr (name_space, ' ') == NULL);
 389   g_return_if_fail (G_IS_PARAM_SPEC (pspec));
 390
 391   /* FIXME: hack hack hack, replacing pspec->name to include namespace */
 392   name = g_strdup_printf ("-%s-%s", name_space, pspec->name);
 393   g_free (pspec->name);
 394   pspec->name = name;
 395
 396   gtk_style_properties_register_property (parse_func, pspec);
 397 }
 398
 399 /**
 400  * gtk_theming_engine_get_property:
 401  * @engine: a #GtkThemingEngine
 402  * @property: the property name
 403  * @state: state to retrieve the value for
 404  * @value: (out) (transfer full): return location for the property value,
 405  *         you must free this memory using g_value_unset() once you are
 406  *         done with it.
 407  *
 408  * Gets a property value as retrieved from the style settings that apply
 409  * to the currently rendered element.
 410  *
 411  * Since: 3.0
 412  **/
 413 void
 414 gtk_theming_engine_get_property (GtkThemingEngine *engine,
 415                                  const gchar      *property,
 416                                  GtkStateFlags     state,
 417                                  GValue           *value)
 418 {
 419   GtkThemingEnginePrivate *priv;
 420
 421   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 422   g_return_if_fail (property != NULL);
 423   g_return_if_fail (value != NULL);
 424
 425   priv = engine->priv;
 426   gtk_style_context_get_property (priv->context, property, state, value);
 427 }
 428
 429 /**
 430  * gtk_theming_engine_get_valist:
 431  * @engine: a #GtkThemingEngine
 432  * @state: state to retrieve values for
 433  * @args: va_list of property name/return location pairs, followed by %NULL
 434  *
 435  * Retrieves several style property values that apply to the currently
 436  * rendered element.
 437  *
 438  * Since: 3.0
 439  **/
 440 void
 441 gtk_theming_engine_get_valist (GtkThemingEngine *engine,
 442                                GtkStateFlags     state,
 443                                va_list           args)
 444 {
 445   GtkThemingEnginePrivate *priv;
 446
 447   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 448
 449   priv = engine->priv;
 450   gtk_style_context_get_valist (priv->context, state, args);
 451 }
 452
 453 /**
 454  * gtk_theming_engine_get:
 455  * @engine: a #GtkThemingEngine
 456  * @state: state to retrieve values for
 457  * @...: property name /return value pairs, followed by %NULL
 458  *
 459  * Retrieves several style property values that apply to the currently
 460  * rendered element.
 461  *
 462  * Since: 3.0
 463  **/
 464 void
 465 gtk_theming_engine_get (GtkThemingEngine *engine,
 466                         GtkStateFlags     state,
 467                         ...)
 468 {
 469   GtkThemingEnginePrivate *priv;
 470   va_list args;
 471
 472   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 473
 474   priv = engine->priv;
 475
 476   va_start (args, state);
 477   gtk_style_context_get_valist (priv->context, state, args);
 478   va_end (args);
 479 }
 480
 481 /**
 482  * gtk_theming_engine_get_style_property:
 483  * @engine: a #GtkThemingEngine
 484  * @property_name: the name of the widget style property
 485  * @value: Return location for the property value, free with
 486  *         g_value_unset() after use.
 487  *
 488  * Gets the value for a widget style property.
 489  *
 490  * Since: 3.0
 491  **/
 492 void
 493 gtk_theming_engine_get_style_property (GtkThemingEngine *engine,
 494                                        const gchar      *property_name,
 495                                        GValue           *value)
 496 {
 497   GtkThemingEnginePrivate *priv;
 498
 499   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 500   g_return_if_fail (property_name != NULL);
 501
 502   priv = engine->priv;
 503   gtk_style_context_get_style_property (priv->context, property_name, value);
 504 }
 505
 506 /**
 507  * gtk_theming_engine_get_style_valist:
 508  * @engine: a #GtkThemingEngine
 509  * @args: va_list of property name/return location pairs, followed by %NULL
 510  *
 511  * Retrieves several widget style properties from @engine according to the
 512  * currently rendered content's style.
 513  *
 514  * Since: 3.0
 515  **/
 516 void
 517 gtk_theming_engine_get_style_valist (GtkThemingEngine *engine,
 518                                      va_list           args)
 519 {
 520   GtkThemingEnginePrivate *priv;
 521
 522   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 523
 524   priv = engine->priv;
 525   gtk_style_context_get_style_valist (priv->context, args);
 526 }
 527
 528 /**
 529  * gtk_theming_engine_get_style:
 530  * @engine: a #GtkThemingEngine
 531  * @...: property name /return value pairs, followed by %NULL
 532  *
 533  * Retrieves several widget style properties from @engine according
 534  * to the currently rendered content's style.
 535  *
 536  * Since: 3.0
 537  **/
 538 void
 539 gtk_theming_engine_get_style (GtkThemingEngine *engine,
 540                               ...)
 541 {
 542   GtkThemingEnginePrivate *priv;
 543   va_list args;
 544
 545   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 546
 547   priv = engine->priv;
 548
 549   va_start (args, engine);
 550   gtk_style_context_get_style_valist (priv->context, args);
 551   va_end (args);
 552 }
 553
 554 /**
 555  * gtk_theming_engine_lookup_color:
 556  * @engine: a #GtkThemingEngine
 557  * @color_name: color name to lookup
 558  * @color: (out): Return location for the looked up color
 559  *
 560  * Looks up and resolves a color name in the current style's color map.
 561  *
 562  * Returns: %TRUE if @color_name was found and resolved, %FALSE otherwise
 563  **/
 564 gboolean
 565 gtk_theming_engine_lookup_color (GtkThemingEngine *engine,
 566                                  const gchar      *color_name,
 567                                  GdkRGBA          *color)
 568 {
 569   GtkThemingEnginePrivate *priv;
 570
 571   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 572   g_return_val_if_fail (color_name != NULL, FALSE);
 573
 574   priv = engine->priv;
 575   return gtk_style_context_lookup_color (priv->context, color_name, color);
 576 }
 577
 578 /**
 579  * gtk_theming_engine_get_state:
 580  * @engine: a #GtkThemingEngine
 581  *
 582  * returns the state used when rendering.
 583  *
 584  * Returns: the state flags
 585  *
 586  * Since: 3.0
 587  **/
 588 GtkStateFlags
 589 gtk_theming_engine_get_state (GtkThemingEngine *engine)
 590 {
 591   GtkThemingEnginePrivate *priv;
 592
 593   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 594
 595   priv = engine->priv;
 596   return gtk_style_context_get_state (priv->context);
 597 }
 598
 599 /**
 600  * gtk_theming_engine_state_is_running:
 601  * @engine: a #GtkThemingEngine
 602  * @state: a widget state
 603  * @progress: (out): return location for the transition progress
 604  *
 605  * Returns %TRUE if there is a transition animation running for the
 606  * current region (see gtk_style_context_push_animatable_region()).
 607  *
 608  * If @progress is not %NULL, the animation progress will be returned
 609  * there, 0.0 means the state is closest to being %FALSE, while 1.0 means
 610  * it's closest to being %TRUE. This means transition animations will
 611  * run from 0 to 1 when @state is being set to %TRUE and from 1 to 0 when
 612  * it's being set to %FALSE.
 613  *
 614  * Returns: %TRUE if there is a running transition animation for @state.
 615  *
 616  * Since: 3.0
 617  **/
 618 gboolean
 619 gtk_theming_engine_state_is_running (GtkThemingEngine *engine,
 620                                      GtkStateType      state,
 621                                      gdouble          *progress)
 622 {
 623   GtkThemingEnginePrivate *priv;
 624
 625   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 626
 627   priv = engine->priv;
 628   return gtk_style_context_state_is_running (priv->context, state, progress);
 629 }
 630
 631 /**
 632  * gtk_theming_engine_get_path:
 633  * @engine: a #GtkThemingEngine
 634  *
 635  * Returns the widget path used for style matching.
 636  *
 637  * Returns: (transfer none): A #GtkWidgetPath
 638  *
 639  * Since: 3.0
 640  **/
 641 const GtkWidgetPath *
 642 gtk_theming_engine_get_path (GtkThemingEngine *engine)
 643 {
 644   GtkThemingEnginePrivate *priv;
 645
 646   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 647
 648   priv = engine->priv;
 649   return gtk_style_context_get_path (priv->context);
 650 }
 651
 652 /**
 653  * gtk_theming_engine_has_class:
 654  * @engine: a #GtkThemingEngine
 655  * @style_class: class name to look up
 656  *
 657  * Returns %TRUE if the currently rendered contents have
 658  * defined the given class name.
 659  *
 660  * Returns: %TRUE if @engine has @class_name defined
 661  *
 662  * Since: 3.0
 663  **/
 664 gboolean
 665 gtk_theming_engine_has_class (GtkThemingEngine *engine,
 666                               const gchar      *style_class)
 667 {
 668   GtkThemingEnginePrivate *priv;
 669
 670   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 671
 672   priv = engine->priv;
 673   return gtk_style_context_has_class (priv->context, style_class);
 674 }
 675
 676 /**
 677  * gtk_theming_engine_has_region:
 678  * @engine: a #GtkThemingEngine
 679  * @style_region: a region name
 680  * @flags: (out) (allow-none): return location for region flags
 681  *
 682  * Returns %TRUE if the currently rendered contents have the
 683  * region defined. If @flags_return is not %NULL, it is set
 684  * to the flags affecting the region.
 685  *
 686  * Returns: %TRUE if region is defined
 687  *
 688  * Since: 3.0
 689  **/
 690 gboolean
 691 gtk_theming_engine_has_region (GtkThemingEngine *engine,
 692                                const gchar      *style_region,
 693                                GtkRegionFlags   *flags)
 694 {
 695   GtkThemingEnginePrivate *priv;
 696
 697   if (flags)
 698     *flags = 0;
 699
 700   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), FALSE);
 701
 702   priv = engine->priv;
 703   return gtk_style_context_has_region (priv->context, style_region, flags);
 704 }
 705
 706 /**
 707  * gtk_theming_engine_get_direction:
 708  * @engine: a #GtkThemingEngine
 709  *
 710  * Returns the widget direction used for rendering.
 711  *
 712  * Returns: the widget direction
 713  *
 714  * Since: 3.0
 715  **/
 716 GtkTextDirection
 717 gtk_theming_engine_get_direction (GtkThemingEngine *engine)
 718 {
 719   GtkThemingEnginePrivate *priv;
 720
 721   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), GTK_TEXT_DIR_LTR);
 722
 723   priv = engine->priv;
 724   return gtk_style_context_get_direction (priv->context);
 725 }
 726
 727 /**
 728  * gtk_theming_engine_get_junction_sides:
 729  * @engine: a #GtkThemingEngine
 730  *
 731  * Returns the widget direction used for rendering.
 732  *
 733  * Returns: the widget direction
 734  *
 735  * Since: 3.0
 736  **/
 737 GtkJunctionSides
 738 gtk_theming_engine_get_junction_sides (GtkThemingEngine *engine)
 739 {
 740   GtkThemingEnginePrivate *priv;
 741
 742   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0);
 743
 744   priv = engine->priv;
 745   return gtk_style_context_get_junction_sides (priv->context);
 746 }
 747
 748 /**
 749  * gtk_theming_engine_get_color:
 750  * @engine: a #GtkThemingEngine
 751  * @state: state to retrieve the color for
 752  * @color: (out): return value for the foreground color
 753  *
 754  * Gets the foreground color for a given state.
 755  *
 756  * Since: 3.0
 757  **/
 758 void
 759 gtk_theming_engine_get_color (GtkThemingEngine *engine,
 760                               GtkStateFlags     state,
 761                               GdkRGBA          *color)
 762 {
 763   GtkThemingEnginePrivate *priv;
 764
 765   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 766
 767   priv = engine->priv;
 768   gtk_style_context_get_color (priv->context, state, color);
 769 }
 770
 771 /**
 772  * gtk_theming_engine_get_background_color:
 773  * @engine: a #GtkThemingEngine
 774  * @state: state to retrieve the color for
 775  * @color: (out): return value for the background color
 776  *
 777  * Gets the background color for a given state.
 778  *
 779  * Since: 3.0
 780  **/
 781 void
 782 gtk_theming_engine_get_background_color (GtkThemingEngine *engine,
 783                                          GtkStateFlags     state,
 784                                          GdkRGBA          *color)
 785 {
 786   GtkThemingEnginePrivate *priv;
 787
 788   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 789
 790   priv = engine->priv;
 791   gtk_style_context_get_background_color (priv->context, state, color);
 792 }
 793
 794 /**
 795  * gtk_theming_engine_get_border_color:
 796  * @engine: a #GtkThemingEngine
 797  * @state: state to retrieve the color for
 798  * @color: (out): return value for the border color
 799  *
 800  * Gets the border color for a given state.
 801  *
 802  * Since: 3.0
 803  **/
 804 void
 805 gtk_theming_engine_get_border_color (GtkThemingEngine *engine,
 806                                      GtkStateFlags     state,
 807                                      GdkRGBA          *color)
 808 {
 809   GtkThemingEnginePrivate *priv;
 810
 811   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 812
 813   priv = engine->priv;
 814   gtk_style_context_get_border_color (priv->context, state, color);
 815 }
 816
 817 /**
 818  * gtk_theming_engine_get_border:
 819  * @engine: a #GtkthemingEngine
 820  * @state: state to retrieve the border for
 821  * @border: (out): return value for the border settings
 822  *
 823  * Gets the border for a given state as a #GtkBorder.
 824  *
 825  * Since: 3.0
 826  **/
 827 void
 828 gtk_theming_engine_get_border (GtkThemingEngine *engine,
 829                                GtkStateFlags     state,
 830                                GtkBorder        *border)
 831 {
 832   GtkThemingEnginePrivate *priv;
 833
 834   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 835
 836   priv = engine->priv;
 837   gtk_style_context_get_border (priv->context, state, border);
 838 }
 839
 840 /**
 841  * gtk_theming_engine_get_padding:
 842  * @engine: a #GtkthemingEngine
 843  * @state: state to retrieve the padding for
 844  * @padding: (out): return value for the padding settings
 845  *
 846  * Gets the padding for a given state as a #GtkBorder.
 847  *
 848  * Since: 3.0
 849  **/
 850 void
 851 gtk_theming_engine_get_padding (GtkThemingEngine *engine,
 852                                 GtkStateFlags     state,
 853                                 GtkBorder        *padding)
 854 {
 855   GtkThemingEnginePrivate *priv;
 856
 857   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 858
 859   priv = engine->priv;
 860   gtk_style_context_get_padding (priv->context, state, padding);
 861 }
 862
 863 /**
 864  * gtk_theming_engine_get_margin:
 865  * @engine: a #GtkThemingEngine
 866  * @state: state to retrieve the border for
 867  * @margin: (out): return value for the margin settings
 868  *
 869  * Gets the margin for a given state as a #GtkBorder.
 870  *
 871  * Since: 3.0
 872  **/
 873 void
 874 gtk_theming_engine_get_margin (GtkThemingEngine *engine,
 875                                GtkStateFlags     state,
 876                                GtkBorder        *margin)
 877 {
 878   GtkThemingEnginePrivate *priv;
 879
 880   g_return_if_fail (GTK_IS_THEMING_ENGINE (engine));
 881
 882   priv = engine->priv;
 883   gtk_style_context_get_margin (priv->context, state, margin);
 884 }
 885
 886 /**
 887  * gtk_theming_engine_get_font:
 888  * @engine: a #GtkThemingEngine
 889  * @state: state to retrieve the font for
 890  *
 891  * Returns the font description for a given state.
 892  *
 893  * Returns: (transfer none): the #PangoFontDescription for the given
 894  *          state. This object is owned by GTK+ and should not be
 895  *          freed.
 896  *
 897  * Since: 3.0
 898  **/
 899 const PangoFontDescription *
 900 gtk_theming_engine_get_font (GtkThemingEngine *engine,
 901                              GtkStateFlags     state)
 902 {
 903   GtkThemingEnginePrivate *priv;
 904
 905   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
 906
 907   priv = engine->priv;
 908   return gtk_style_context_get_font (priv->context, state);
 909 }
 910
 911 /* GtkThemingModule */
 912
 913 static gboolean
 914 gtk_theming_module_load (GTypeModule *type_module)
 915 {
 916   GtkThemingModule *theming_module;
 917   GModule *module;
 918   gchar *name, *module_path;
 919
 920   theming_module = GTK_THEMING_MODULE (type_module);
 921   name = theming_module->name;
 922   module_path = _gtk_find_module (name, "theming-engines");
 923
 924   if (!module_path)
 925     return FALSE;
 926
 927   module = g_module_open (module_path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 928   g_free (module_path);
 929
 930   if (!module)
 931     return FALSE;
 932
 933   if (!g_module_symbol (module, "theme_init",
 934                         (gpointer *) &theming_module->init) ||
 935       !g_module_symbol (module, "theme_exit",
 936                         (gpointer *) &theming_module->exit) ||
 937       !g_module_symbol (module, "create_engine",
 938                         (gpointer *) &theming_module->create_engine))
 939     {
 940       g_module_close (module);
 941
 942       return FALSE;
 943     }
 944
 945   theming_module->module = module;
 946
 947   theming_module->init (G_TYPE_MODULE (theming_module));
 948
 949   return TRUE;
 950 }
 951
 952 static void
 953 gtk_theming_module_unload (GTypeModule *type_module)
 954 {
 955   GtkThemingModule *theming_module;
 956
 957   theming_module = GTK_THEMING_MODULE (type_module);
 958
 959   theming_module->exit ();
 960
 961   g_module_close (theming_module->module);
 962
 963   theming_module->module = NULL;
 964   theming_module->init = NULL;
 965   theming_module->exit = NULL;
 966   theming_module->create_engine = NULL;
 967 }
 968
 969 static void
 970 gtk_theming_module_class_init (GtkThemingModuleClass *klass)
 971 {
 972   GTypeModuleClass *module_class = G_TYPE_MODULE_CLASS (klass);
 973
 974   module_class->load = gtk_theming_module_load;
 975   module_class->unload = gtk_theming_module_unload;
 976 }
 977
 978 static void
 979 gtk_theming_module_init (GtkThemingModule *module)
 980 {
 981 }
 982
 983 /**
 984  * gtk_theming_engine_load:
 985  * @name: Theme engine name to load
 986  *
 987  * Loads and initializes a theming engine module from the
 988  * standard directories.
 989  *
 990  * Returns: (transfer none): A theming engine, or %NULL if
 991  * the engine @name doesn't exist.
 992  **/
 993 GtkThemingEngine *
 994 gtk_theming_engine_load (const gchar *name)
 995 {
 996   static GHashTable *engines = NULL;
 997   static GtkThemingEngine *default_engine;
 998   GtkThemingEngine *engine = NULL;
 999
1000   if (name)
1001     {
1002       if (!engines)
1003         engines = g_hash_table_new (g_str_hash, g_str_equal);
1004
1005       engine = g_hash_table_lookup (engines, name);
1006
1007       if (!engine)
1008         {
1009           GtkThemingModule *module;
1010
1011           module = g_object_new (GTK_TYPE_THEMING_MODULE, NULL);
1012           g_type_module_set_name (G_TYPE_MODULE (module), name);
1013           module->name = g_strdup (name);
1014
1015           if (module && g_type_module_use (G_TYPE_MODULE (module)))
1016             {
1017               engine = (module->create_engine) ();
1018
1019               if (engine)
1020                 g_hash_table_insert (engines, module->name, engine);
1021             }
1022         }
1023     }
1024
1025   if (!engine)
1026     {
1027       if (G_UNLIKELY (!default_engine))
1028         default_engine = g_object_new (GTK_TYPE_THEMING_ENGINE, NULL);
1029
1030       engine = default_engine;
1031     }
1032
1033   return engine;
1034 }
1035
1036 /**
1037  * gtk_theming_engine_get_screen:
1038  * @engine: a #GtkThemingEngine
1039  *
1040  * Returns the #GdkScreen to which @engine currently rendering to.
1041  *
1042  * Returns: (transfer none): a #GdkScreen, or %NULL.
1043  **/
1044 GdkScreen *
1045 gtk_theming_engine_get_screen (GtkThemingEngine *engine)
1046 {
1047   GtkThemingEnginePrivate *priv;
1048
1049   g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), NULL);
1050
1051   priv = engine->priv;
1052   return gtk_style_context_get_screen (priv->context);
1053 }
1054
1055 /* Paint method implementations */
1056 static void
1057 gtk_theming_engine_render_check (GtkThemingEngine *engine,
1058                                  cairo_t          *cr,
1059                                  gdouble           x,
1060                                  gdouble           y,
1061                                  gdouble           width,
1062                                  gdouble           height)
1063 {
1064   GdkRGBA fg_color, bg_color;
1065   GtkStateFlags flags;
1066   gint exterior_size, interior_size, thickness, pad;
1067   GtkBorderStyle border_style;
1068   GtkBorder border;
1069   gint border_width;
1070
1071   flags = gtk_theming_engine_get_state (engine);
1072   cairo_save (cr);
1073
1074   gtk_theming_engine_get_color (engine, flags, &fg_color);
1075   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1076   gtk_theming_engine_get_border (engine, flags, &border);
1077
1078   gtk_theming_engine_get (engine, flags,
1079                           "border-style", &border_style,
1080                           NULL);
1081
1082   border_width = MIN (MIN (border.top, border.bottom),
1083                       MIN (border.left, border.right));
1084   exterior_size = MIN (width, height);
1085
1086   if (exterior_size % 2 == 0) /* Ensure odd */
1087     exterior_size -= 1;
1088
1089   /* FIXME: thickness */
1090   thickness = 1;
1091   pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1092   interior_size = MAX (1, exterior_size - 2 * pad);
1093
1094   if (interior_size < 7)
1095     {
1096       interior_size = 7;
1097       pad = MAX (0, (exterior_size - interior_size) / 2);
1098     }
1099
1100   x -= (1 + exterior_size - (gint) width) / 2;
1101   y -= (1 + exterior_size - (gint) height) / 2;
1102
1103   if (border_style == GTK_BORDER_STYLE_SOLID)
1104     {
1105       GdkRGBA border_color;
1106
1107       cairo_set_line_width (cr, border_width);
1108       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1109
1110       cairo_rectangle (cr, x + 0.5, y + 0.5, exterior_size - 1, exterior_size - 1);
1111       gdk_cairo_set_source_rgba (cr, &bg_color);
1112       cairo_fill_preserve (cr);
1113
1114       gdk_cairo_set_source_rgba (cr, &border_color);
1115       cairo_stroke (cr);
1116     }
1117
1118   gdk_cairo_set_source_rgba (cr, &fg_color);
1119
1120   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1121     {
1122       int line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1123
1124       cairo_rectangle (cr,
1125                        x + pad,
1126                        y + pad + (1 + interior_size - line_thickness) / 2,
1127                        interior_size,
1128                        line_thickness);
1129       cairo_fill (cr);
1130     }
1131   else
1132     {
1133       gdouble progress;
1134       gboolean running;
1135
1136       running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1137
1138       if ((flags & GTK_STATE_FLAG_ACTIVE) || running)
1139         {
1140           if (!running)
1141             progress = 1;
1142
1143           cairo_translate (cr,
1144                            x + pad, y + pad);
1145
1146           cairo_scale (cr, interior_size / 7., interior_size / 7.);
1147
1148           cairo_rectangle (cr, 0, 0, 7 * progress, 7);
1149           cairo_clip (cr);
1150
1151           cairo_move_to  (cr, 7.0, 0.0);
1152           cairo_line_to  (cr, 7.5, 1.0);
1153           cairo_curve_to (cr, 5.3, 2.0,
1154                           4.3, 4.0,
1155                           3.5, 7.0);
1156           cairo_curve_to (cr, 3.0, 5.7,
1157                           1.3, 4.7,
1158                           0.0, 4.7);
1159           cairo_line_to  (cr, 0.2, 3.5);
1160           cairo_curve_to (cr, 1.1, 3.5,
1161                           2.3, 4.3,
1162                           3.0, 5.0);
1163           cairo_curve_to (cr, 1.0, 3.9,
1164                           2.4, 4.1,
1165                           3.2, 4.9);
1166           cairo_curve_to (cr, 3.5, 3.1,
1167                           5.2, 2.0,
1168                           7.0, 0.0);
1169
1170           cairo_fill (cr);
1171         }
1172     }
1173
1174   cairo_restore (cr);
1175 }
1176
1177 static void
1178 gtk_theming_engine_render_option (GtkThemingEngine *engine,
1179                                   cairo_t          *cr,
1180                                   gdouble           x,
1181                                   gdouble           y,
1182                                   gdouble           width,
1183                                   gdouble           height)
1184 {
1185   GtkStateFlags flags;
1186   GdkRGBA fg_color, bg_color;
1187   gint exterior_size, interior_size, pad, thickness, border_width;
1188   GtkBorderStyle border_style;
1189   GtkBorder border;
1190
1191   flags = gtk_theming_engine_get_state (engine);
1192
1193   cairo_save (cr);
1194
1195   gtk_theming_engine_get_color (engine, flags, &fg_color);
1196   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1197   gtk_theming_engine_get_border (engine, flags, &border);
1198
1199   gtk_theming_engine_get (engine, flags,
1200                           "border-style", &border_style,
1201                           NULL);
1202
1203   exterior_size = MIN (width, height);
1204   border_width = MIN (MIN (border.top, border.bottom),
1205                       MIN (border.left, border.right));
1206
1207   if (exterior_size % 2 == 0) /* Ensure odd */
1208     exterior_size -= 1;
1209
1210   x -= (1 + exterior_size - width) / 2;
1211   y -= (1 + exterior_size - height) / 2;
1212
1213   if (border_style == GTK_BORDER_STYLE_SOLID)
1214     {
1215       GdkRGBA border_color;
1216
1217       cairo_set_line_width (cr, border_width);
1218       gtk_theming_engine_get_border_color (engine, flags, &border_color);
1219
1220       cairo_new_sub_path (cr);
1221       cairo_arc (cr,
1222                  x + exterior_size / 2.,
1223                  y + exterior_size / 2.,
1224                  (exterior_size - 1) / 2.,
1225                  0, 2 * G_PI);
1226
1227       gdk_cairo_set_source_rgba (cr, &bg_color);
1228       cairo_fill_preserve (cr);
1229
1230       gdk_cairo_set_source_rgba (cr, &border_color);
1231       cairo_stroke (cr);
1232     }
1233
1234   gdk_cairo_set_source_rgba (cr, &fg_color);
1235
1236   /* FIXME: thickness */
1237   thickness = 1;
1238
1239   if (flags & GTK_STATE_FLAG_INCONSISTENT)
1240     {
1241       gint line_thickness;
1242
1243       pad = thickness + MAX (1, (exterior_size - 2 * thickness) / 9);
1244       interior_size = MAX (1, exterior_size - 2 * pad);
1245
1246       if (interior_size < 7)
1247         {
1248           interior_size = 7;
1249           pad = MAX (0, (exterior_size - interior_size) / 2);
1250         }
1251
1252       line_thickness = MAX (1, (3 + interior_size * 2) / 7);
1253
1254       cairo_rectangle (cr,
1255                        x + pad,
1256                        y + pad + (interior_size - line_thickness) / 2.,
1257                        interior_size,
1258                        line_thickness);
1259       cairo_fill (cr);
1260     }
1261   if (flags & GTK_STATE_FLAG_ACTIVE)
1262     {
1263       pad = thickness + MAX (1, 2 * (exterior_size - 2 * thickness) / 9);
1264       interior_size = MAX (1, exterior_size - 2 * pad);
1265
1266       if (interior_size < 5)
1267         {
1268           interior_size = 7;
1269           pad = MAX (0, (exterior_size - interior_size) / 2);
1270         }
1271
1272       cairo_new_sub_path (cr);
1273       cairo_arc (cr,
1274                  x + pad + interior_size / 2.,
1275                  y + pad + interior_size / 2.,
1276                  interior_size / 2.,
1277                  0, 2 * G_PI);
1278       cairo_fill (cr);
1279     }
1280
1281   cairo_restore (cr);
1282 }
1283
1284 static void
1285 add_path_arrow (cairo_t *cr,
1286                 gdouble  angle,
1287                 gdouble  x,
1288                 gdouble  y,
1289                 gdouble  size)
1290 {
1291   cairo_save (cr);
1292
1293   cairo_translate (cr, x + (size / 2), y + (size / 2));
1294   cairo_rotate (cr, angle);
1295
1296   cairo_move_to (cr, 0, - (size / 4));
1297   cairo_line_to (cr, - (size / 2), (size / 4));
1298   cairo_line_to (cr, (size / 2), (size / 4));
1299   cairo_close_path (cr);
1300
1301   cairo_restore (cr);
1302 }
1303
1304 static void
1305 gtk_theming_engine_render_arrow (GtkThemingEngine *engine,
1306                                  cairo_t          *cr,
1307                                  gdouble           angle,
1308                                  gdouble           x,
1309                                  gdouble           y,
1310                                  gdouble           size)
1311 {
1312   GtkStateFlags flags;
1313   GdkRGBA fg_color;
1314
1315   cairo_save (cr);
1316
1317   flags = gtk_theming_engine_get_state (engine);
1318   gtk_theming_engine_get_color (engine, flags, &fg_color);
1319
1320   if (flags & GTK_STATE_FLAG_INSENSITIVE)
1321     {
1322       add_path_arrow (cr, angle, x + 1, y + 1, size);
1323       cairo_set_source_rgb (cr, 1, 1, 1);
1324       cairo_fill (cr);
1325     }
1326
1327   add_path_arrow (cr, angle, x, y, size);
1328   gdk_cairo_set_source_rgba (cr, &fg_color);
1329   cairo_fill (cr);
1330
1331   cairo_restore (cr);
1332 }
1333
1334 static void
1335 add_path_line (cairo_t        *cr,
1336                gdouble         x1,
1337                gdouble         y1,
1338                gdouble         x2,
1339                gdouble         y2)
1340 {
1341   /* Adjust endpoints */
1342   if (y1 == y2)
1343     {
1344       y1 += 0.5;
1345       y2 += 0.5;
1346       x2 += 1;
1347     }
1348   else if (x1 == x2)
1349     {
1350       x1 += 0.5;
1351       x2 += 0.5;
1352       y2 += 1;
1353     }
1354
1355   cairo_move_to (cr, x1, y1);
1356   cairo_line_to (cr, x2, y2);
1357 }
1358
1359 static void
1360 color_shade (const GdkRGBA *color,
1361              gdouble        factor,
1362              GdkRGBA       *color_return)
1363 {
1364   GtkSymbolicColor *literal, *shade;
1365
1366   literal = gtk_symbolic_color_new_literal (color);
1367   shade = gtk_symbolic_color_new_shade (literal, factor);
1368   gtk_symbolic_color_unref (literal);
1369
1370   gtk_symbolic_color_resolve (shade, NULL, color_return);
1371   gtk_symbolic_color_unref (shade);
1372 }
1373
1374 static void
1375 _cairo_ellipsis (cairo_t *cr,
1376                  double xc, double yc,
1377                  double xradius, double yradius,
1378                  double angle1, double angle2)
1379 {
1380   if (xradius <= 0.0 || yradius <= 0.0)
1381     {
1382       /* stolen from cairo sources */
1383       cairo_line_to (cr, xc, yc); /* might become a move_to */
1384       cairo_line_to (cr, xc, yc);
1385       return;
1386     }
1387
1388   cairo_save (cr);
1389   cairo_translate (cr, xc, yc);
1390   cairo_scale (cr, xradius, yradius);
1391   cairo_arc (cr, 0, 0, 1.0, angle1, angle2);
1392   cairo_restore (cr);
1393 }
1394
1395 static void
1396 _cairo_round_rectangle_sides (cairo_t                  *cr,
1397                               const GtkCssBorderRadius *border_radius,
1398                               gdouble                   x,
1399                               gdouble                   y,
1400                               gdouble                   width,
1401                               gdouble                   height,
1402                               guint                     sides)
1403 {
1404   cairo_new_sub_path (cr);
1405
1406   if (sides & SIDE_RIGHT)
1407     {
1408       _cairo_ellipsis (cr,
1409                        x + width - border_radius->top_right.horizontal,
1410                        y + border_radius->top_right.vertical,
1411                        border_radius->top_right.horizontal,
1412                        border_radius->top_right.vertical,
1413                        - G_PI / 4, 0);
1414       _cairo_ellipsis (cr,
1415                        x + width - border_radius->bottom_right.horizontal,
1416                        y + height - border_radius->bottom_right.vertical,
1417                        border_radius->bottom_right.horizontal,
1418                        border_radius->bottom_right.vertical,
1419                        0, G_PI / 4);
1420     }
1421
1422   if (sides & SIDE_BOTTOM)
1423     {
1424       _cairo_ellipsis (cr,
1425                        x + width - border_radius->bottom_right.horizontal,
1426                        y + height - border_radius->bottom_right.vertical,
1427                        border_radius->bottom_right.horizontal,
1428                        border_radius->bottom_right.vertical,
1429                        G_PI / 4, G_PI / 2);
1430       _cairo_ellipsis (cr,
1431                        x + border_radius->bottom_left.horizontal,
1432                        y + height - border_radius->bottom_left.vertical,
1433                        border_radius->bottom_left.horizontal,
1434                        border_radius->bottom_left.vertical,
1435                        G_PI / 2, 3 * (G_PI / 4));
1436     }
1437   else
1438     cairo_move_to (cr, x, y + height);
1439
1440   if (sides & SIDE_LEFT)
1441     {
1442       _cairo_ellipsis (cr,
1443                        x + border_radius->bottom_left.horizontal,
1444                        y + height - border_radius->bottom_left.vertical,
1445                        border_radius->bottom_left.horizontal,
1446                        border_radius->bottom_left.vertical,
1447                        3 * (G_PI / 4), G_PI);
1448       _cairo_ellipsis (cr,
1449                        x + border_radius->top_left.horizontal,
1450                        y + border_radius->top_left.vertical,
1451                        border_radius->top_left.horizontal,
1452                        border_radius->top_left.vertical,
1453                        G_PI, G_PI + G_PI / 4);
1454     }
1455   else
1456     cairo_move_to (cr, x, y);
1457
1458   if (sides & SIDE_TOP)
1459     {
1460       _cairo_ellipsis (cr,
1461                        x + border_radius->top_left.horizontal,
1462                        y + border_radius->top_left.vertical,
1463                        border_radius->top_left.horizontal,
1464                        border_radius->top_left.vertical,
1465                        5 * (G_PI / 4), 3 * (G_PI / 2));
1466       _cairo_ellipsis (cr,
1467                        x + width - border_radius->top_right.horizontal,
1468                        y + border_radius->top_right.vertical,
1469                        border_radius->top_right.horizontal,
1470                        border_radius->top_right.vertical,
1471                        3 * (G_PI / 2), - G_PI / 4);
1472     }
1473 }
1474
1475 static void
1476 _cairo_uneven_frame (cairo_t                  *cr,
1477                      const GtkCssBorderRadius *border_radius,
1478                      gdouble                   x,
1479                      gdouble                   y,
1480                      gdouble                   width,
1481                      gdouble                   height,
1482                      GtkBorder                *border)
1483 {
1484   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
1485   cairo_set_line_width (cr, 1);
1486
1487   _cairo_round_rectangle_sides (cr, border_radius,
1488                                 x, y,
1489                                 width, height,
1490                                 SIDE_ALL);
1491
1492   _cairo_round_rectangle_sides (cr, border_radius,
1493                                 x + border->left,
1494                                 y + border->top,
1495                                 width - border->left - border->right,
1496                                 height - border->top - border->bottom,
1497                                 SIDE_ALL);
1498 }
1499
1500 static void
1501 render_background_internal (GtkThemingEngine *engine,
1502                             cairo_t          *cr,
1503                             gdouble           x,
1504                             gdouble           y,
1505                             gdouble           width,
1506                             gdouble           height,
1507                             GtkJunctionSides  junction)
1508 {
1509   GdkRGBA bg_color;
1510   cairo_pattern_t *pattern;
1511   GtkStateFlags flags;
1512   gboolean running;
1513   gdouble progress, alpha = 1;
1514   GtkCssBorderCornerRadius *top_left_radius, *top_right_radius;
1515   GtkCssBorderCornerRadius *bottom_left_radius, *bottom_right_radius;
1516   GtkCssBorderRadius border_radius = { { 0, },  };
1517   gdouble mat_w, mat_h;
1518
1519   /* Use unmodified size for pattern scaling */
1520   mat_w = width;
1521   mat_h = height;
1522
1523   flags = gtk_theming_engine_get_state (engine);
1524
1525   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1526
1527   gtk_theming_engine_get (engine, flags,
1528                           "background-image", &pattern,
1529                           /* Can't use border-radius as it's an int for
1530                            * backwards compat */
1531                           "border-top-left-radius", &top_left_radius,
1532                           "border-top-right-radius", &top_right_radius,
1533                           "border-bottom-right-radius", &bottom_right_radius,
1534                           "border-bottom-left-radius", &bottom_left_radius,
1535                           NULL);
1536
1537   if (top_left_radius)
1538     border_radius.top_left = *top_left_radius;
1539   g_free (top_left_radius);
1540   if (top_right_radius)
1541     border_radius.top_right = *top_right_radius;
1542   g_free (top_right_radius);
1543   if (bottom_right_radius)
1544     border_radius.bottom_right = *bottom_right_radius;
1545   g_free (bottom_right_radius);
1546   if (bottom_left_radius)
1547     border_radius.bottom_left = *bottom_left_radius;
1548   g_free (bottom_left_radius);
1549
1550   cairo_save (cr);
1551   cairo_translate (cr, x, y);
1552
1553   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1554
1555   if (gtk_theming_engine_has_class (engine, "background"))
1556     {
1557       cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0); /* transparent */
1558       cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
1559       cairo_paint (cr);
1560     }
1561
1562   if (running)
1563     {
1564       cairo_pattern_t *other_pattern;
1565       GtkStateFlags other_flags;
1566       GdkRGBA other_bg;
1567       cairo_pattern_t *new_pattern = NULL;
1568
1569       if (flags & GTK_STATE_FLAG_PRELIGHT)
1570         {
1571           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
1572           progress = 1 - progress;
1573         }
1574       else
1575         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
1576
1577       gtk_theming_engine_get_background_color (engine, other_flags, &other_bg);
1578       gtk_theming_engine_get (engine, other_flags,
1579                               "background-image", &other_pattern,
1580                               NULL);
1581
1582       if (pattern && other_pattern)
1583         {
1584           cairo_pattern_type_t type, other_type;
1585           gint n0, n1;
1586
1587           cairo_pattern_get_color_stop_count (pattern, &n0);
1588           cairo_pattern_get_color_stop_count (other_pattern, &n1);
1589           type = cairo_pattern_get_type (pattern);
1590           other_type = cairo_pattern_get_type (other_pattern);
1591
1592           if (type == other_type && n0 == n1)
1593             {
1594               gdouble offset0, red0, green0, blue0, alpha0;
1595               gdouble offset1, red1, green1, blue1, alpha1;
1596               gdouble x00, x01, y00, y01, x10, x11, y10, y11;
1597               gdouble r00, r01, r10, r11;
1598               guint i;
1599
1600               if (type == CAIRO_PATTERN_TYPE_LINEAR)
1601                 {
1602                   cairo_pattern_get_linear_points (pattern, &x00, &y00, &x01, &y01);
1603                   cairo_pattern_get_linear_points (other_pattern, &x10, &y10, &x11, &y11);
1604
1605                   new_pattern = cairo_pattern_create_linear (x00 + (x10 - x00) * progress,
1606                                                              y00 + (y10 - y00) * progress,
1607                                                              x01 + (x11 - x01) * progress,
1608                                                              y01 + (y11 - y01) * progress);
1609                 }
1610               else
1611                 {
1612                   cairo_pattern_get_radial_circles (pattern, &x00, &y00, &r00, &x01, &y01, &r01);
1613                   cairo_pattern_get_radial_circles (other_pattern, &x10, &y10, &r10, &x11, &y11, &r11);
1614
1615                   new_pattern = cairo_pattern_create_radial (x00 + (x10 - x00) * progress,
1616                                                              y00 + (y10 - y00) * progress,
1617                                                              r00 + (r10 - r00) * progress,
1618                                                              x01 + (x11 - x01) * progress,
1619                                                              y01 + (y11 - y01) * progress,
1620                                                              r01 + (r11 - r01) * progress);
1621                 }
1622
1623               cairo_pattern_set_filter (new_pattern, CAIRO_FILTER_FAST);
1624               i = 0;
1625
1626               /* Blend both gradients into one */
1627               while (i < n0 && i < n1)
1628                 {
1629                   cairo_pattern_get_color_stop_rgba (pattern, i,
1630                                                      &offset0,
1631                                                      &red0, &green0, &blue0,
1632                                                      &alpha0);
1633                   cairo_pattern_get_color_stop_rgba (other_pattern, i,
1634                                                      &offset1,
1635                                                      &red1, &green1, &blue1,
1636                                                      &alpha1);
1637
1638                   cairo_pattern_add_color_stop_rgba (new_pattern,
1639                                                      offset0 + ((offset1 - offset0) * progress),
1640                                                      red0 + ((red1 - red0) * progress),
1641                                                      green0 + ((green1 - green0) * progress),
1642                                                      blue0 + ((blue1 - blue0) * progress),
1643                                                      alpha0 + ((alpha1 - alpha0) * progress));
1644                   i++;
1645                 }
1646             }
1647           else
1648             {
1649               /* Different pattern types, or different color
1650                * stop counts, alpha blend both patterns.
1651                */
1652               _cairo_round_rectangle_sides (cr, &border_radius,
1653                                             0, 0, width, height,
1654                                             SIDE_ALL);
1655
1656               cairo_scale (cr, mat_w, mat_h);
1657               cairo_set_source (cr, other_pattern);
1658               cairo_scale (cr, 1.0 / mat_w, 1.0 / mat_h);
1659               cairo_fill_preserve (cr);
1660
1661               /* Set alpha for posterior drawing
1662                * of the target pattern
1663                */
1664               alpha = 1 - progress;
1665             }
1666         }
1667       else if (pattern || other_pattern)
1668         {
1669           cairo_pattern_t *p;
1670           const GdkRGBA *c;
1671           gdouble x0, y0, x1, y1, r0, r1;
1672           gint n, i;
1673
1674           /* Blend a pattern with a color */
1675           if (pattern)
1676             {
1677               p = pattern;
1678               c = &other_bg;
1679               progress = 1 - progress;
1680             }
1681           else
1682             {
1683               p = other_pattern;
1684               c = &bg_color;
1685             }
1686
1687           if (cairo_pattern_get_type (p) == CAIRO_PATTERN_TYPE_LINEAR)
1688             {
1689               cairo_pattern_get_linear_points (p, &x0, &y0, &x1, &y1);
1690               new_pattern = cairo_pattern_create_linear (x0, y0, x1, y1);
1691             }
1692           else
1693             {
1694               cairo_pattern_get_radial_circles (p, &x0, &y0, &r0, &x1, &y1, &r1);
1695               new_pattern = cairo_pattern_create_radial (x0, y0, r0, x1, y1, r1);
1696             }
1697
1698           cairo_pattern_get_color_stop_count (p, &n);
1699
1700           for (i = 0; i < n; i++)
1701             {
1702               gdouble red1, green1, blue1, alpha1;
1703               gdouble offset;
1704
1705               cairo_pattern_get_color_stop_rgba (p, i,
1706                                                  &offset,
1707                                                  &red1, &green1, &blue1,
1708                                                  &alpha1);
1709               cairo_pattern_add_color_stop_rgba (new_pattern, offset,
1710                                                  c->red + ((red1 - c->red) * progress),
1711                                                  c->green + ((green1 - c->green) * progress),
1712                                                  c->blue + ((blue1 - c->blue) * progress),
1713                                                  c->alpha + ((alpha1 - c->alpha) * progress));
1714             }
1715         }
1716       else
1717         {
1718           /* Merge just colors */
1719           new_pattern = cairo_pattern_create_rgba (CLAMP (bg_color.red + ((other_bg.red - bg_color.red) * progress), 0, 1),
1720                                                    CLAMP (bg_color.green + ((other_bg.green - bg_color.green) * progress), 0, 1),
1721                                                    CLAMP (bg_color.blue + ((other_bg.blue - bg_color.blue) * progress), 0, 1),
1722                                                    CLAMP (bg_color.alpha + ((other_bg.alpha - bg_color.alpha) * progress), 0, 1));
1723         }
1724
1725       if (new_pattern)
1726         {
1727           /* Replace pattern to use */
1728           cairo_pattern_destroy (pattern);
1729           pattern = new_pattern;
1730         }
1731
1732       if (other_pattern)
1733         cairo_pattern_destroy (other_pattern);
1734     }
1735
1736   _cairo_round_rectangle_sides (cr, &border_radius,
1737                                 0, 0, width, height,
1738                                 SIDE_ALL);
1739   if (pattern)
1740     {
1741       cairo_scale (cr, mat_w, mat_h);
1742       cairo_set_source (cr, pattern);
1743       cairo_scale (cr, 1.0 / mat_w, 1.0 / mat_h);
1744     }
1745   else
1746     gdk_cairo_set_source_rgba (cr, &bg_color);
1747
1748   if (alpha == 1)
1749     {
1750       cairo_fill (cr);
1751     }
1752   else
1753     {
1754       cairo_save (cr);
1755       cairo_clip (cr);
1756       cairo_paint_with_alpha (cr, alpha);
1757       cairo_restore (cr);
1758     }
1759
1760   if (pattern)
1761     cairo_pattern_destroy (pattern);
1762
1763   cairo_restore (cr);
1764 }
1765
1766 static void
1767 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1768                                       cairo_t          *cr,
1769                                       gdouble           x,
1770                                       gdouble           y,
1771                                       gdouble           width,
1772                                       gdouble           height)
1773 {
1774   GtkJunctionSides junction;
1775
1776   junction = gtk_theming_engine_get_junction_sides (engine);
1777
1778   render_background_internal (engine, cr,
1779                               x, y, width, height,
1780                               junction);
1781 }
1782
1783 /* Renders the small triangle on corners so
1784  * frames with 0 radius have a 3D-like effect
1785  */
1786 static void
1787 _cairo_corner_triangle (cairo_t *cr,
1788                         gdouble  x,
1789                         gdouble  y,
1790                         gint     size)
1791 {
1792   gint i;
1793
1794   cairo_move_to (cr, x + 0.5, y + size - 0.5);
1795   cairo_line_to (cr, x + size - 0.5, y + size - 0.5);
1796   cairo_line_to (cr, x + size - 0.5, y + 0.5);
1797
1798   for (i = 1; i < size - 1; i++)
1799     {
1800       cairo_move_to (cr, x + size - 0.5, y + i + 0.5);
1801       cairo_line_to (cr, x + (size - i) - 0.5, y + i + 0.5);
1802     }
1803 }
1804
1805 static void
1806 gtk_themeing_engine_apply_junction_to_radius (GtkCssBorderRadius *border_radius,
1807                                               GtkJunctionSides    junction)
1808 {
1809   if (junction & GTK_JUNCTION_CORNER_TOPLEFT)
1810     border_radius->top_left.horizontal = border_radius->top_left.vertical = 0;
1811   if (junction & GTK_JUNCTION_CORNER_TOPRIGHT)
1812     border_radius->top_right.horizontal = border_radius->top_right.vertical = 0;
1813   if (junction & GTK_JUNCTION_CORNER_BOTTOMRIGHT)
1814     border_radius->bottom_right.horizontal = border_radius->bottom_right.vertical = 0;
1815   if (junction & GTK_JUNCTION_CORNER_BOTTOMLEFT)
1816     border_radius->bottom_left.horizontal = border_radius->bottom_left.vertical = 0;
1817 }
1818
1819 static void
1820 render_frame_internal (GtkThemingEngine *engine,
1821                        cairo_t          *cr,
1822                        gdouble           x,
1823                        gdouble           y,
1824                        gdouble           width,
1825                        gdouble           height,
1826                        guint             hidden_side,
1827                        GtkJunctionSides  junction)
1828 {
1829   GtkStateFlags state;
1830   GdkRGBA lighter;
1831   GdkRGBA border_color;
1832   GtkBorderStyle border_style;
1833   gint border_width;
1834   GtkCssBorderCornerRadius *top_left_radius, *top_right_radius;
1835   GtkCssBorderCornerRadius *bottom_left_radius, *bottom_right_radius;
1836   GtkCssBorderRadius border_radius = { { 0, },  };
1837   gdouble progress, d1, d2;
1838   gboolean running;
1839   GtkBorder border;
1840   gboolean uniform_border;
1841
1842   state = gtk_theming_engine_get_state (engine);
1843
1844   gtk_theming_engine_get_border_color (engine, state, &border_color);
1845   gtk_theming_engine_get_border (engine, state, &border);
1846
1847   gtk_theming_engine_get (engine, state,
1848                           "border-style", &border_style,
1849                           /* Can't use border-radius as it's an int for
1850                            * backwards compat */
1851                           "border-top-left-radius", &top_left_radius,
1852                           "border-top-right-radius", &top_right_radius,
1853                           "border-bottom-right-radius", &bottom_right_radius,
1854                           "border-bottom-left-radius", &bottom_left_radius,
1855                           NULL);
1856
1857   if (top_left_radius)
1858     border_radius.top_left = *top_left_radius;
1859   g_free (top_left_radius);
1860   if (top_right_radius)
1861     border_radius.top_right = *top_right_radius;
1862   g_free (top_right_radius);
1863   if (bottom_right_radius)
1864     border_radius.bottom_right = *bottom_right_radius;
1865   g_free (bottom_right_radius);
1866   if (bottom_left_radius)
1867     border_radius.bottom_left = *bottom_left_radius;
1868   g_free (bottom_left_radius);
1869
1870   gtk_themeing_engine_apply_junction_to_radius (&border_radius, junction);
1871
1872   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1873   border_width = MIN (MIN (border.top, border.bottom),
1874                       MIN (border.left, border.right));
1875   uniform_border = (border.top == border.bottom &&
1876                     border.top == border.left &&
1877                     border.top == border.right);
1878
1879   if (running)
1880     {
1881       GtkStateFlags other_state;
1882       GdkRGBA other_color;
1883
1884       if (state & GTK_STATE_FLAG_PRELIGHT)
1885         {
1886           other_state = state & ~(GTK_STATE_FLAG_PRELIGHT);
1887           progress = 1 - progress;
1888         }
1889       else
1890         other_state = state | GTK_STATE_FLAG_PRELIGHT;
1891
1892       gtk_theming_engine_get_border_color (engine, other_state, &other_color);
1893
1894       border_color.red = CLAMP (border_color.red + ((other_color.red - border_color.red) * progress), 0, 1);
1895       border_color.green = CLAMP (border_color.green + ((other_color.green - border_color.green) * progress), 0, 1);
1896       border_color.blue = CLAMP (border_color.blue + ((other_color.blue - border_color.blue) * progress), 0, 1);
1897       border_color.alpha = CLAMP (border_color.alpha + ((other_color.alpha - border_color.alpha) * progress), 0, 1);
1898     }
1899
1900   cairo_save (cr);
1901
1902   color_shade (&border_color, 1.8, &lighter);
1903
1904   switch (border_style)
1905     {
1906     case GTK_BORDER_STYLE_NONE:
1907       break;
1908     case GTK_BORDER_STYLE_SOLID:
1909       cairo_set_line_width (cr, border_width);
1910       cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1911
1912       gdk_cairo_set_source_rgba (cr, &border_color);
1913
1914       cairo_save (cr);
1915       _cairo_uneven_frame (cr, &border_radius,
1916                            x, y, width, height,
1917                            &border);
1918       cairo_fill (cr);
1919       cairo_restore (cr);
1920
1921       break;
1922     case GTK_BORDER_STYLE_INSET:
1923     case GTK_BORDER_STYLE_OUTSET:
1924       cairo_set_line_width (cr, border_width);
1925       cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
1926
1927       if (border_width > 1)
1928         {
1929           d1 = (gdouble) border_width / 2;
1930           d2 = border_width;
1931         }
1932       else
1933         {
1934           d1 = 0.5;
1935           d2 = 1;
1936         }
1937
1938       cairo_save (cr);
1939
1940       if (uniform_border)
1941         {
1942           if (border_style == GTK_BORDER_STYLE_INSET)
1943             gdk_cairo_set_source_rgba (cr, &lighter);
1944           else
1945             gdk_cairo_set_source_rgba (cr, &border_color);
1946
1947           _cairo_round_rectangle_sides (cr, &border_radius,
1948                                         x + d1, y + d1,
1949                                         width - d2, height - d2,
1950                                         (SIDE_BOTTOM | SIDE_RIGHT) & ~(hidden_side));
1951           cairo_stroke (cr);
1952
1953           if (border_style == GTK_BORDER_STYLE_INSET)
1954             gdk_cairo_set_source_rgba (cr, &border_color);
1955           else
1956             gdk_cairo_set_source_rgba (cr, &lighter);
1957
1958           _cairo_round_rectangle_sides (cr, &border_radius,
1959                                         x + d1, y + d1,
1960                                         width - d2, height - d2,
1961                                         (SIDE_TOP | SIDE_LEFT) & ~(hidden_side));
1962           cairo_stroke (cr);
1963         }
1964       else
1965         {
1966           cairo_save (cr);
1967
1968           /* Bottom/right */
1969           if (border_style == GTK_BORDER_STYLE_INSET)
1970             gdk_cairo_set_source_rgba (cr, &lighter);
1971           else
1972             gdk_cairo_set_source_rgba (cr, &border_color);
1973
1974           _cairo_uneven_frame (cr, &border_radius,
1975                                x, y, width, height,
1976                                &border);
1977           cairo_fill (cr);
1978
1979           /* Top/left */
1980           cairo_move_to (cr, x, y);
1981           cairo_line_to (cr, x + width, y);
1982           cairo_line_to (cr,
1983                          x + width - border.right - border_radius.top_right.horizontal / 2,
1984                          y + border.top + border_radius.top_right.vertical / 2);
1985           cairo_line_to (cr,
1986                          x + width - border.right - border_radius.bottom_right.horizontal / 2,
1987                          y + height - border.bottom - border_radius.bottom_right.vertical / 2);
1988           cairo_line_to (cr,
1989                          x + border.left + border_radius.bottom_left.horizontal / 2,
1990                          y + height - border.bottom - border_radius.bottom_left.vertical / 2);
1991           cairo_line_to (cr, x, y + height);
1992           cairo_close_path (cr);
1993
1994           cairo_clip (cr);
1995
1996           if (border_style == GTK_BORDER_STYLE_INSET)
1997             gdk_cairo_set_source_rgba (cr, &border_color);
1998           else
1999             gdk_cairo_set_source_rgba (cr, &lighter);
2000
2001           _cairo_uneven_frame (cr, &border_radius,
2002                                x, y, width, height,
2003                                &border);
2004           cairo_fill (cr);
2005           cairo_restore (cr);
2006         }
2007
2008       if (border_width > 1)
2009         {
2010           /* overprint top/right and bottom/left corner
2011            * triangles if there are square corners there,
2012            * to give the box a 3D-like appearance.
2013            */
2014           cairo_save (cr);
2015
2016           if (border_style == GTK_BORDER_STYLE_INSET)
2017             gdk_cairo_set_source_rgba (cr, &lighter);
2018           else
2019             gdk_cairo_set_source_rgba (cr, &border_color);
2020
2021           cairo_set_line_width (cr, 1);
2022
2023           if ((junction & GTK_JUNCTION_CORNER_TOPRIGHT) != 0)
2024             _cairo_corner_triangle (cr,
2025                                     x + width - border_width, y,
2026                                     border_width);
2027
2028           if ((junction & GTK_JUNCTION_CORNER_BOTTOMLEFT) != 0)
2029             _cairo_corner_triangle (cr,
2030                                     x, y + height - border_width,
2031                                     border_width);
2032           cairo_stroke (cr);
2033           cairo_restore (cr);
2034         }
2035
2036       cairo_restore (cr);
2037       break;
2038     }
2039
2040   cairo_restore (cr);
2041 }
2042
2043 static void
2044 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
2045                                  cairo_t          *cr,
2046                                  gdouble           x,
2047                                  gdouble           y,
2048                                  gdouble           width,
2049                                  gdouble           height)
2050 {
2051   GtkStateFlags flags;
2052   GtkBorderStyle border_style;
2053   GtkJunctionSides junction;
2054   GtkBorderImage *border_image;
2055   GtkBorder border;
2056
2057   flags = gtk_theming_engine_get_state (engine);
2058   junction = gtk_theming_engine_get_junction_sides (engine);
2059   gtk_theming_engine_get_border (engine, flags, &border);
2060
2061   gtk_theming_engine_get (engine, flags,
2062                           "border-image", &border_image,
2063                           "border-style", &border_style,
2064                           NULL);
2065
2066   if (border_image != NULL)
2067     {
2068       _gtk_border_image_render (border_image, &border,
2069                                 cr, x, y, width, height);
2070       _gtk_border_image_unref (border_image);
2071     }
2072   else if (border_style != GTK_BORDER_STYLE_NONE)
2073     render_frame_internal (engine, cr,
2074                            x, y, width, height,
2075                            0, junction);
2076 }
2077
2078 static void
2079 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
2080                                     cairo_t          *cr,
2081                                     gdouble           x,
2082                                     gdouble           y,
2083                                     gdouble           width,
2084                                     gdouble           height)
2085 {
2086   GtkStateFlags flags;
2087   GdkRGBA outline_color, fg_color;
2088   double vertical_overshoot;
2089   int diameter;
2090   double radius;
2091   double interp;                /* interpolation factor for center position */
2092   double x_double_horz, y_double_horz;
2093   double x_double_vert, y_double_vert;
2094   double x_double, y_double;
2095   gdouble angle;
2096   gint line_width;
2097   gboolean running, is_rtl;
2098   gdouble progress;
2099
2100   cairo_save (cr);
2101   flags = gtk_theming_engine_get_state (engine);
2102
2103   gtk_theming_engine_get_color (engine, flags, &fg_color);
2104   gtk_theming_engine_get_border_color (engine, flags, &outline_color);
2105
2106   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
2107   is_rtl = (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL);
2108   line_width = 1;
2109
2110   if (!running)
2111     progress = (flags & GTK_STATE_FLAG_ACTIVE) ? 1 : 0;
2112
2113   if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_HORIZONTAL))
2114     {
2115       if (is_rtl)
2116         angle = (G_PI) - ((G_PI / 2) * progress);
2117       else
2118         angle = (G_PI / 2) * progress;
2119     }
2120   else
2121     {
2122       if (is_rtl)
2123         angle = (G_PI / 2) + ((G_PI / 2) * progress);
2124       else
2125         angle = (G_PI / 2) - ((G_PI / 2) * progress);
2126     }
2127
2128   interp = progress;
2129
2130   /* Compute distance that the stroke extends beyonds the end
2131    * of the triangle we draw.
2132    */
2133   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
2134
2135   /* For odd line widths, we end the vertical line of the triangle
2136    * at a half pixel, so we round differently.
2137    */
2138   if (line_width % 2 == 1)
2139     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
2140   else
2141     vertical_overshoot = ceil (vertical_overshoot);
2142
2143   /* Adjust the size of the triangle we draw so that the entire stroke fits
2144    */
2145   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
2146
2147   /* If the line width is odd, we want the diameter to be even,
2148    * and vice versa, so force the sum to be odd. This relationship
2149    * makes the point of the triangle look right.
2150    */
2151   diameter -= (1 - (diameter + line_width) % 2);
2152
2153   radius = diameter / 2.;
2154
2155   /* Adjust the center so that the stroke is properly aligned with
2156    * the pixel grid. The center adjustment is different for the
2157    * horizontal and vertical orientations. For intermediate positions
2158    * we interpolate between the two.
2159    */
2160   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
2161   y_double_vert = (y + height / 2) - 0.5;
2162
2163   x_double_horz = (x + width / 2) - 0.5;
2164   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
2165
2166   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
2167   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
2168
2169   cairo_translate (cr, x_double, y_double);
2170   cairo_rotate (cr, angle);
2171
2172   cairo_move_to (cr, - radius / 2., - radius);
2173   cairo_line_to (cr,   radius / 2.,   0);
2174   cairo_line_to (cr, - radius / 2.,   radius);
2175   cairo_close_path (cr);
2176
2177   cairo_set_line_width (cr, line_width);
2178
2179   gdk_cairo_set_source_rgba (cr, &fg_color);
2180
2181   cairo_fill_preserve (cr);
2182
2183   gdk_cairo_set_source_rgba (cr, &outline_color);
2184   cairo_stroke (cr);
2185
2186   cairo_restore (cr);
2187 }
2188
2189 static void
2190 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
2191                                  cairo_t          *cr,
2192                                  gdouble           x,
2193                                  gdouble           y,
2194                                  gdouble           width,
2195                                  gdouble           height)
2196 {
2197   GtkStateFlags flags;
2198   GdkRGBA color;
2199   gint line_width;
2200   gint8 *dash_list;
2201
2202   cairo_save (cr);
2203   flags = gtk_theming_engine_get_state (engine);
2204
2205   gtk_theming_engine_get_color (engine, flags, &color);
2206
2207   gtk_theming_engine_get_style (engine,
2208                                 "focus-line-width", &line_width,
2209                                 "focus-line-pattern", (gchar *) &dash_list,
2210                                 NULL);
2211
2212   cairo_set_line_width (cr, (gdouble) line_width);
2213
2214   if (dash_list[0])
2215     {
2216       gint n_dashes = strlen ((const gchar *) dash_list);
2217       gdouble *dashes = g_new (gdouble, n_dashes);
2218       gdouble total_length = 0;
2219       gdouble dash_offset;
2220       gint i;
2221
2222       for (i = 0; i < n_dashes; i++)
2223         {
2224           dashes[i] = dash_list[i];
2225           total_length += dash_list[i];
2226         }
2227
2228       /* The dash offset here aligns the pattern to integer pixels
2229        * by starting the dash at the right side of the left border
2230        * Negative dash offsets in cairo don't work
2231        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
2232        */
2233       dash_offset = - line_width / 2.;
2234
2235       while (dash_offset < 0)
2236         dash_offset += total_length;
2237
2238       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
2239       g_free (dashes);
2240     }
2241
2242   cairo_rectangle (cr,
2243                    x + line_width / 2.,
2244                    y + line_width / 2.,
2245                    width - line_width,
2246                    height - line_width);
2247
2248   gdk_cairo_set_source_rgba (cr, &color);
2249   cairo_stroke (cr);
2250
2251   cairo_restore (cr);
2252
2253   g_free (dash_list);
2254 }
2255
2256 static void
2257 gtk_theming_engine_render_line (GtkThemingEngine *engine,
2258                                 cairo_t          *cr,
2259                                 gdouble           x0,
2260                                 gdouble           y0,
2261                                 gdouble           x1,
2262                                 gdouble           y1)
2263 {
2264   GdkRGBA bg_color, darker, lighter;
2265   GtkStateFlags flags;
2266   gint i, thickness, thickness_dark, thickness_light, len;
2267   cairo_matrix_t matrix;
2268   gdouble angle;
2269
2270   /* FIXME: thickness */
2271   thickness = 2;
2272   thickness_dark = thickness / 2;
2273   thickness_light = thickness - thickness_dark;
2274
2275   flags = gtk_theming_engine_get_state (engine);
2276   cairo_save (cr);
2277
2278   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2279   color_shade (&bg_color, 0.7, &darker);
2280   color_shade (&bg_color, 1.3, &lighter);
2281
2282   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
2283   cairo_set_line_width (cr, 1);
2284
2285   angle = atan2 (x1 - x0, y1 - y0);
2286   angle = (2 * G_PI) - angle;
2287   angle += G_PI / 2;
2288
2289   cairo_get_matrix (cr, &matrix);
2290   cairo_matrix_translate (&matrix, x0, y0);
2291   cairo_matrix_rotate (&matrix, angle);
2292   cairo_set_matrix (cr, &matrix);
2293
2294   x1 -= x0;
2295   y1 -= y0;
2296
2297   len = (gint) sqrt ((x1 * x1) + (y1 * y1));
2298
2299   y0 = -thickness_dark;
2300
2301   for (i = 0; i < thickness_dark; i++)
2302     {
2303       gdk_cairo_set_source_rgba (cr, &lighter);
2304       add_path_line (cr, len - i - 1.5, y0, len - 0.5, y0);
2305       cairo_stroke (cr);
2306
2307       gdk_cairo_set_source_rgba (cr, &darker);
2308       add_path_line (cr, 0.5, y0, len - i - 1.5, y0);
2309       cairo_stroke (cr);
2310
2311       y0++;
2312     }
2313
2314   for (i = 0; i < thickness_light; i++)
2315     {
2316       gdk_cairo_set_source_rgba (cr, &darker);
2317       add_path_line (cr, 0.5, y0, thickness_light - i + 0.5, y0);
2318       cairo_stroke (cr);
2319
2320       gdk_cairo_set_source_rgba (cr, &lighter);
2321       add_path_line (cr, thickness_light - i + 0.5, y0, len - 0.5, y0);
2322       cairo_stroke (cr);
2323
2324       y0++;
2325     }
2326
2327   cairo_restore (cr);
2328 }
2329
2330 static void
2331 prepare_context_for_layout (cairo_t *cr,
2332                             gdouble x,
2333                             gdouble y,
2334                             PangoLayout *layout)
2335 {
2336   const PangoMatrix *matrix;
2337
2338   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2339
2340   cairo_move_to (cr, x, y);
2341
2342   if (matrix)
2343     {
2344       cairo_matrix_t cairo_matrix;
2345
2346       cairo_matrix_init (&cairo_matrix,
2347                          matrix->xx, matrix->yx,
2348                          matrix->xy, matrix->yy,
2349                          matrix->x0, matrix->y0);
2350
2351       cairo_transform (cr, &cairo_matrix);
2352     }
2353 }
2354
2355 static void
2356 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2357                                   cairo_t          *cr,
2358                                   gdouble           x,
2359                                   gdouble           y,
2360                                   PangoLayout      *layout)
2361 {
2362   GdkRGBA fg_color;
2363   GtkShadow *text_shadow = NULL;
2364   GtkStateFlags flags;
2365   gdouble progress;
2366   gboolean running;
2367
2368   cairo_save (cr);
2369   flags = gtk_theming_engine_get_state (engine);
2370   gtk_theming_engine_get_color (engine, flags, &fg_color);
2371
2372   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
2373
2374   if (running)
2375     {
2376       GtkStateFlags other_flags;
2377       GdkRGBA other_fg;
2378
2379       if (flags & GTK_STATE_FLAG_PRELIGHT)
2380         {
2381           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
2382           progress = 1 - progress;
2383         }
2384       else
2385         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
2386
2387       gtk_theming_engine_get_color (engine, other_flags, &other_fg);
2388
2389       fg_color.red = CLAMP (fg_color.red + ((other_fg.red - fg_color.red) * progress), 0, 1);
2390       fg_color.green = CLAMP (fg_color.green + ((other_fg.green - fg_color.green) * progress), 0, 1);
2391       fg_color.blue = CLAMP (fg_color.blue + ((other_fg.blue - fg_color.blue) * progress), 0, 1);
2392       fg_color.alpha = CLAMP (fg_color.alpha + ((other_fg.alpha - fg_color.alpha) * progress), 0, 1);
2393     }
2394
2395   gtk_theming_engine_get (engine, flags,
2396                           "text-shadow", &text_shadow,
2397                           NULL);
2398
2399   prepare_context_for_layout (cr, x, y, layout);
2400
2401   if (text_shadow != NULL)
2402     {
2403       _gtk_text_shadow_paint_layout (text_shadow, cr, layout);
2404       _gtk_shadow_unref (text_shadow);
2405     }
2406
2407   gdk_cairo_set_source_rgba (cr, &fg_color);
2408   pango_cairo_show_layout (cr, layout);
2409
2410   cairo_restore (cr);
2411 }
2412
2413 static void
2414 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2415                                   cairo_t          *cr,
2416                                   gdouble           x,
2417                                   gdouble           y,
2418                                   gdouble           width,
2419                                   gdouble           height,
2420                                   GtkOrientation    orientation)
2421 {
2422   const GtkWidgetPath *path;
2423   gint thickness;
2424
2425   path = gtk_theming_engine_get_path (engine);
2426
2427   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2428   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2429
2430   /* FIXME: thickness */
2431   thickness = 2;
2432
2433   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
2434     {
2435       if (orientation == GTK_ORIENTATION_VERTICAL)
2436         gtk_theming_engine_render_line (engine, cr,
2437                                         x + thickness,
2438                                         y + (gint) height / 2,
2439                                         x + width - thickness - 1,
2440                                         y + (gint) height / 2);
2441       else
2442         gtk_theming_engine_render_line (engine, cr,
2443                                         x + (gint) width / 2,
2444                                         y + thickness,
2445                                         x + (gint) width / 2,
2446                                         y + height - thickness - 1);
2447     }
2448 }
2449
2450 static void
2451 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2452                                      cairo_t          *cr,
2453                                      gdouble           x,
2454                                      gdouble           y,
2455                                      gdouble           width,
2456                                      gdouble           height,
2457                                      GtkPositionType   gap_side,
2458                                      gdouble           xy0_gap,
2459                                      gdouble           xy1_gap)
2460 {
2461   GtkJunctionSides junction;
2462   GtkStateFlags state;
2463   gint border_width;
2464   GtkCssBorderCornerRadius *top_left_radius, *top_right_radius;
2465   GtkCssBorderCornerRadius *bottom_left_radius, *bottom_right_radius;
2466   GtkCssBorderRadius border_radius = { { 0, },  };
2467   gdouble x0, y0, x1, y1, xc, yc, wc, hc;
2468   GtkBorder border;
2469
2470   xc = yc = wc = hc = 0;
2471   state = gtk_theming_engine_get_state (engine);
2472   junction = gtk_theming_engine_get_junction_sides (engine);
2473
2474   gtk_theming_engine_get_border (engine, state, &border);
2475   gtk_theming_engine_get (engine, state,
2476                           /* Can't use border-radius as it's an int for
2477                            * backwards compat */
2478                           "border-top-left-radius", &top_left_radius,
2479                           "border-top-right-radius", &top_right_radius,
2480                           "border-bottom-right-radius", &bottom_right_radius,
2481                           "border-bottom-left-radius", &bottom_left_radius,
2482                           NULL);
2483
2484   if (top_left_radius)
2485     border_radius.top_left = *top_left_radius;
2486   g_free (top_left_radius);
2487   if (top_right_radius)
2488     border_radius.top_right = *top_right_radius;
2489   g_free (top_right_radius);
2490   if (bottom_right_radius)
2491     border_radius.bottom_right = *bottom_right_radius;
2492   g_free (bottom_right_radius);
2493   if (bottom_left_radius)
2494     border_radius.bottom_left = *bottom_left_radius;
2495   g_free (bottom_left_radius);
2496
2497   border_width = MIN (MIN (border.top, border.bottom),
2498                       MIN (border.left, border.right));
2499
2500   cairo_save (cr);
2501
2502   switch (gap_side)
2503     {
2504     case GTK_POS_TOP:
2505       xc = x + xy0_gap + border_width;
2506       yc = y;
2507       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2508       hc = border_width;
2509
2510       if (xy0_gap < border_radius.top_left.horizontal)
2511         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2512
2513       if (xy1_gap > width - border_radius.top_right.horizontal)
2514         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2515       break;
2516     case GTK_POS_BOTTOM:
2517       xc = x + xy0_gap + border_width;
2518       yc = y + height - border_width;
2519       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2520       hc = border_width;
2521
2522       if (xy0_gap < border_radius.bottom_left.horizontal)
2523         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2524
2525       if (xy1_gap > width - border_radius.bottom_right.horizontal)
2526         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2527
2528       break;
2529     case GTK_POS_LEFT:
2530       xc = x;
2531       yc = y + xy0_gap + border_width;
2532       wc = border_width;
2533       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2534
2535       if (xy0_gap < border_radius.top_left.vertical)
2536         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2537
2538       if (xy1_gap > height - border_radius.bottom_left.vertical)
2539         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2540
2541       break;
2542     case GTK_POS_RIGHT:
2543       xc = x + width - border_width;
2544       yc = y + xy0_gap + border_width;
2545       wc = border_width;
2546       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2547
2548       if (xy0_gap < border_radius.top_right.vertical)
2549         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2550
2551       if (xy1_gap > height - border_radius.bottom_right.vertical)
2552         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2553
2554       break;
2555     }
2556
2557   cairo_clip_extents (cr, &x0, &y0, &x1, &y1);
2558   cairo_rectangle (cr, x0, y0, x1 - x0, yc - y0);
2559   cairo_rectangle (cr, x0, yc, xc - x0, hc);
2560   cairo_rectangle (cr, xc + wc, yc, x1 - (xc + wc), hc);
2561   cairo_rectangle (cr, x0, yc + hc, x1 - x0, y1 - (yc + hc));
2562   cairo_clip (cr);
2563
2564   render_frame_internal (engine, cr,
2565                          x, y, width, height,
2566                          0, junction);
2567
2568   cairo_restore (cr);
2569 }
2570
2571 static void
2572 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2573                                      cairo_t          *cr,
2574                                      gdouble           x,
2575                                      gdouble           y,
2576                                      gdouble           width,
2577                                      gdouble           height,
2578                                      GtkPositionType   gap_side)
2579 {
2580   GtkJunctionSides junction = 0;
2581   guint hidden_side = 0;
2582
2583   cairo_save (cr);
2584
2585   switch (gap_side)
2586     {
2587     case GTK_POS_LEFT:
2588       junction = GTK_JUNCTION_LEFT;
2589       hidden_side = SIDE_LEFT;
2590
2591       cairo_translate (cr, x + width, y);
2592       cairo_rotate (cr, G_PI / 2);
2593       break;
2594     case GTK_POS_RIGHT:
2595       junction = GTK_JUNCTION_RIGHT;
2596       hidden_side = SIDE_RIGHT;
2597
2598       cairo_translate (cr, x, y + height);
2599       cairo_rotate (cr, - G_PI / 2);
2600       break;
2601     case GTK_POS_TOP:
2602       junction = GTK_JUNCTION_TOP;
2603       hidden_side = SIDE_TOP;
2604
2605       cairo_translate (cr, x + width, y + height);
2606       cairo_rotate (cr, G_PI);
2607       break;
2608     case GTK_POS_BOTTOM:
2609       junction = GTK_JUNCTION_BOTTOM;
2610       hidden_side = SIDE_BOTTOM;
2611
2612       cairo_translate (cr, x, y);
2613       break;
2614     }
2615
2616   if (gap_side == GTK_POS_TOP ||
2617       gap_side == GTK_POS_BOTTOM)
2618     render_background_internal (engine, cr,
2619                                 0, 0, width, height,
2620                                 GTK_JUNCTION_BOTTOM);
2621   else
2622     render_background_internal (engine, cr,
2623                                 0, 0, height, width,
2624                                 GTK_JUNCTION_BOTTOM);
2625   cairo_restore (cr);
2626
2627   cairo_save (cr);
2628
2629   render_frame_internal (engine, cr,
2630                          x, y, width, height,
2631                          hidden_side, junction);
2632
2633   cairo_restore (cr);
2634 }
2635
2636 static void
2637 render_dot (cairo_t       *cr,
2638             const GdkRGBA *lighter,
2639             const GdkRGBA *darker,
2640             gdouble        x,
2641             gdouble        y,
2642             gdouble        size)
2643 {
2644   size = CLAMP ((gint) size, 2, 3);
2645
2646   if (size == 2)
2647     {
2648       gdk_cairo_set_source_rgba (cr, lighter);
2649       cairo_rectangle (cr, x, y, 1, 1);
2650       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2651       cairo_fill (cr);
2652     }
2653   else if (size == 3)
2654     {
2655       gdk_cairo_set_source_rgba (cr, lighter);
2656       cairo_rectangle (cr, x, y, 2, 1);
2657       cairo_rectangle (cr, x, y, 1, 2);
2658       cairo_fill (cr);
2659
2660       gdk_cairo_set_source_rgba (cr, darker);
2661       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2662       cairo_rectangle (cr, x + 2, y, 1, 2);
2663       cairo_fill (cr);
2664     }
2665 }
2666
2667 static void
2668 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2669                                   cairo_t          *cr,
2670                                   gdouble           x,
2671                                   gdouble           y,
2672                                   gdouble           width,
2673                                   gdouble           height)
2674 {
2675   GtkStateFlags flags;
2676   GdkRGBA bg_color, lighter, darker;
2677   GtkJunctionSides sides;
2678   gint xx, yy;
2679
2680   cairo_save (cr);
2681   flags = gtk_theming_engine_get_state (engine);
2682
2683   cairo_set_line_width (cr, 1.0);
2684   sides = gtk_theming_engine_get_junction_sides (engine);
2685   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2686
2687   color_shade (&bg_color, 0.7, &darker);
2688   color_shade (&bg_color, 1.3, &lighter);
2689
2690   render_background_internal (engine, cr, x, y, width, height, sides);
2691
2692   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_GRIP))
2693     {
2694       /* reduce confusing values to a meaningful state */
2695       if ((sides & (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)) == (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT))
2696         sides &= ~GTK_JUNCTION_CORNER_TOPLEFT;
2697
2698       if ((sides & (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT)) == (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT))
2699         sides &= ~GTK_JUNCTION_CORNER_TOPRIGHT;
2700
2701       if (sides == 0)
2702         sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2703
2704       /* align drawing area to the connected side */
2705       if (sides == GTK_JUNCTION_LEFT)
2706         {
2707           if (height < width)
2708             width = height;
2709         }
2710       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2711         {
2712           if (width < height)
2713             height = width;
2714           else if (height < width)
2715             width = height;
2716         }
2717       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2718         {
2719           /* make it square, aligning to bottom left */
2720           if (width < height)
2721             {
2722               y += (height - width);
2723               height = width;
2724             }
2725           else if (height < width)
2726             width = height;
2727         }
2728       else if (sides == GTK_JUNCTION_RIGHT)
2729         {
2730           /* aligning to right */
2731           if (height < width)
2732             {
2733               x += (width - height);
2734               width = height;
2735             }
2736         }
2737       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2738         {
2739           if (width < height)
2740             height = width;
2741           else if (height < width)
2742             {
2743               x += (width - height);
2744               width = height;
2745             }
2746         }
2747       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2748         {
2749           /* make it square, aligning to bottom right */
2750           if (width < height)
2751             {
2752               y += (height - width);
2753               height = width;
2754             }
2755           else if (height < width)
2756             {
2757               x += (width - height);
2758               width = height;
2759             }
2760         }
2761       else if (sides == GTK_JUNCTION_TOP)
2762         {
2763           if (width < height)
2764             height = width;
2765         }
2766       else if (sides == GTK_JUNCTION_BOTTOM)
2767         {
2768           /* align to bottom */
2769           if (width < height)
2770             {
2771               y += (height - width);
2772               height = width;
2773             }
2774         }
2775       else
2776         g_assert_not_reached ();
2777
2778       if (sides == GTK_JUNCTION_LEFT ||
2779           sides == GTK_JUNCTION_RIGHT)
2780         {
2781           gint xi;
2782
2783           xi = x;
2784
2785           while (xi < x + width)
2786             {
2787               gdk_cairo_set_source_rgba (cr, &lighter);
2788               add_path_line (cr, x, y, x, y + height);
2789               cairo_stroke (cr);
2790               xi++;
2791
2792               gdk_cairo_set_source_rgba (cr, &darker);
2793               add_path_line (cr, xi, y, xi, y + height);
2794               cairo_stroke (cr);
2795               xi += 2;
2796             }
2797         }
2798       else if (sides == GTK_JUNCTION_TOP ||
2799                sides == GTK_JUNCTION_BOTTOM)
2800         {
2801           gint yi;
2802
2803           yi = y;
2804
2805           while (yi < y + height)
2806             {
2807               gdk_cairo_set_source_rgba (cr, &lighter);
2808               add_path_line (cr, x, yi, x + width, yi);
2809               cairo_stroke (cr);
2810               yi++;
2811
2812               gdk_cairo_set_source_rgba (cr, &darker);
2813               add_path_line (cr, x, yi, x + width, yi);
2814               cairo_stroke (cr);
2815               yi += 2;
2816             }
2817         }
2818       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2819         {
2820           gint xi, yi;
2821
2822           xi = x + width;
2823           yi = y + height;
2824
2825           while (xi > x + 3)
2826             {
2827               gdk_cairo_set_source_rgba (cr, &darker);
2828               add_path_line (cr, xi, y, x, yi);
2829               cairo_stroke (cr);
2830
2831               --xi;
2832               --yi;
2833
2834               add_path_line (cr, xi, y, x, yi);
2835               cairo_stroke (cr);
2836
2837               --xi;
2838               --yi;
2839
2840               gdk_cairo_set_source_rgba (cr, &lighter);
2841               add_path_line (cr, xi, y, x, yi);
2842               cairo_stroke (cr);
2843
2844               xi -= 3;
2845               yi -= 3;
2846             }
2847         }
2848       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2849         {
2850           gint xi, yi;
2851
2852           xi = x;
2853           yi = y + height;
2854
2855           while (xi < (x + width - 3))
2856             {
2857               gdk_cairo_set_source_rgba (cr, &lighter);
2858               add_path_line (cr, xi, y, x + width, yi);
2859               cairo_stroke (cr);
2860
2861               ++xi;
2862               --yi;
2863
2864               gdk_cairo_set_source_rgba (cr, &darker);
2865               add_path_line (cr, xi, y, x + width, yi);
2866               cairo_stroke (cr);
2867
2868               ++xi;
2869               --yi;
2870
2871               add_path_line (cr, xi, y, x + width, yi);
2872               cairo_stroke (cr);
2873
2874               xi += 3;
2875               yi -= 3;
2876             }
2877         }
2878       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2879         {
2880           gint xi, yi;
2881
2882           xi = x + width;
2883           yi = y;
2884
2885           while (xi > x + 3)
2886             {
2887               gdk_cairo_set_source_rgba (cr, &darker);
2888               add_path_line (cr, x, yi, xi, y + height);
2889               cairo_stroke (cr);
2890
2891               --xi;
2892               ++yi;
2893
2894               add_path_line (cr, x, yi, xi, y + height);
2895               cairo_stroke (cr);
2896
2897               --xi;
2898               ++yi;
2899
2900               gdk_cairo_set_source_rgba (cr, &lighter);
2901               add_path_line (cr, x, yi, xi, y + height);
2902               cairo_stroke (cr);
2903
2904               xi -= 3;
2905               yi += 3;
2906             }
2907         }
2908       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2909         {
2910           gint xi, yi;
2911
2912           xi = x;
2913           yi = y;
2914
2915           while (xi < (x + width - 3))
2916             {
2917               gdk_cairo_set_source_rgba (cr, &lighter);
2918               add_path_line (cr, xi, y + height, x + width, yi);
2919               cairo_stroke (cr);
2920
2921               ++xi;
2922               ++yi;
2923
2924               gdk_cairo_set_source_rgba (cr, &darker);
2925               add_path_line (cr, xi, y + height, x + width, yi);
2926               cairo_stroke (cr);
2927
2928               ++xi;
2929               ++yi;
2930
2931               add_path_line (cr, xi, y + height, x + width, yi);
2932               cairo_stroke (cr);
2933
2934               xi += 3;
2935               yi += 3;
2936             }
2937         }
2938     }
2939   else if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_PANE_SEPARATOR))
2940     {
2941       if (width > height)
2942         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2943           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2944       else
2945         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2946           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2947     }
2948   else
2949     {
2950       for (yy = y; yy < y + height; yy += 3)
2951         for (xx = x; xx < x + width; xx += 6)
2952           {
2953             render_dot (cr, &lighter, &darker, xx, yy, 2);
2954             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2955           }
2956     }
2957
2958   cairo_restore (cr);
2959 }
2960
2961 void
2962 _gtk_theming_engine_paint_spinner (cairo_t *cr,
2963                                    gdouble  radius,
2964                                    gdouble  progress,
2965                                    GdkRGBA *color)
2966 {
2967   guint num_steps, step;
2968   gdouble half;
2969   gint i;
2970
2971   num_steps = 12;
2972
2973   if (progress >= 0)
2974     step = (guint) (progress * num_steps);
2975   else
2976     step = 0;
2977
2978   cairo_save (cr);
2979
2980   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2981   cairo_set_line_width (cr, 2.0);
2982
2983   half = num_steps / 2;
2984
2985   for (i = 0; i < num_steps; i++)
2986     {
2987       gint inset = 0.7 * radius;
2988
2989       /* transparency is a function of time and intial value */
2990       gdouble t = 1.0 - (gdouble) ((i + step) % num_steps) / num_steps;
2991       gdouble xscale = - sin (i * G_PI / half);
2992       gdouble yscale = - cos (i * G_PI / half);
2993
2994       cairo_set_source_rgba (cr,
2995                              color->red,
2996                              color->green,
2997                              color->blue,
2998                              color->alpha * t);
2999
3000       cairo_move_to (cr,
3001                      (radius - inset) * xscale,
3002                      (radius - inset) * yscale);
3003       cairo_line_to (cr,
3004                      radius * xscale,
3005                      radius * yscale);
3006
3007       cairo_stroke (cr);
3008     }
3009
3010   cairo_restore (cr);
3011 }
3012
3013 static void
3014 render_spinner (GtkThemingEngine *engine,
3015                 cairo_t          *cr,
3016                 gdouble           x,
3017                 gdouble           y,
3018                 gdouble           width,
3019                 gdouble           height)
3020 {
3021   GtkStateFlags state;
3022   GtkShadow *shadow;
3023   GdkRGBA color;
3024   gdouble progress;
3025   gdouble radius;
3026
3027   state = gtk_theming_engine_get_state (engine);
3028
3029   if (!gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
3030     progress = -1;
3031
3032   radius = MIN (width / 2, height / 2);
3033
3034   gtk_theming_engine_get_color (engine, state, &color);
3035   gtk_theming_engine_get (engine, state,
3036                           "icon-shadow", &shadow,
3037                           NULL);
3038
3039   cairo_save (cr);
3040   cairo_translate (cr, x + width / 2, y + height / 2);
3041
3042   if (shadow != NULL)
3043     {
3044       _gtk_icon_shadow_paint_spinner (shadow, cr,
3045                                       radius,
3046                                       progress);
3047       _gtk_shadow_unref (shadow);
3048     }
3049
3050   _gtk_theming_engine_paint_spinner (cr,
3051                                      radius,
3052                                      progress,
3053                                      &color);
3054
3055   cairo_restore (cr);
3056 }
3057
3058 static void
3059 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
3060                                     cairo_t          *cr,
3061                                     gdouble           x,
3062                                     gdouble           y,
3063                                     gdouble           width,
3064                                     gdouble           height)
3065 {
3066   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
3067     {
3068       render_spinner (engine, cr, x, y, width, height);
3069     }
3070   else
3071     {
3072       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
3073       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
3074     }
3075 }
3076
3077 static GdkPixbuf *
3078 scale_or_ref (GdkPixbuf *src,
3079               gint       width,
3080               gint       height)
3081 {
3082   if (width == gdk_pixbuf_get_width (src) &&
3083       height == gdk_pixbuf_get_height (src))
3084     return g_object_ref (src);
3085   else
3086     return gdk_pixbuf_scale_simple (src,
3087                                     width, height,
3088                                     GDK_INTERP_BILINEAR);
3089 }
3090
3091 static gboolean
3092 lookup_icon_size (GtkThemingEngine *engine,
3093                   GtkIconSize       size,
3094                   gint             *width,
3095                   gint             *height)
3096 {
3097   GdkScreen *screen;
3098   GtkSettings *settings;
3099
3100   screen = gtk_theming_engine_get_screen (engine);
3101   settings = gtk_settings_get_for_screen (screen);
3102
3103   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
3104 }
3105
3106 static void
3107 colorshift_source (cairo_t *cr,
3108                    gdouble shift)
3109 {
3110   cairo_pattern_t *source;
3111
3112   cairo_save (cr);
3113   cairo_paint (cr);
3114
3115   source = cairo_pattern_reference (cairo_get_source (cr));
3116
3117   cairo_set_source_rgb (cr, shift, shift, shift);
3118   cairo_set_operator (cr, CAIRO_OPERATOR_COLOR_DODGE);
3119
3120   cairo_mask (cr, source);
3121
3122   cairo_pattern_destroy (source);
3123   cairo_restore (cr);
3124 }
3125
3126 static GdkPixbuf *
3127 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
3128                                        const GtkIconSource *source,
3129                                        GtkIconSize          size)
3130 {
3131   GdkPixbuf *scaled;
3132   GdkPixbuf *stated;
3133   GdkPixbuf *base_pixbuf;
3134   GtkStateFlags state;
3135   gint width = 1;
3136   gint height = 1;
3137   cairo_t *cr;
3138   cairo_surface_t *surface;
3139
3140   base_pixbuf = gtk_icon_source_get_pixbuf (source);
3141   state = gtk_theming_engine_get_state (engine);
3142
3143   g_return_val_if_fail (base_pixbuf != NULL, NULL);
3144
3145   if (size != (GtkIconSize) -1 &&
3146       !lookup_icon_size (engine, size, &width, &height))
3147     {
3148       g_warning (G_STRLOC ": invalid icon size '%d'", size);
3149       return NULL;
3150     }
3151
3152   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
3153    * leave it alone.
3154    */
3155   if (size != (GtkIconSize) -1 &&
3156       gtk_icon_source_get_size_wildcarded (source))
3157     scaled = scale_or_ref (base_pixbuf, width, height);
3158   else
3159     scaled = g_object_ref (base_pixbuf);
3160
3161   /* If the state was wildcarded, then generate a state. */
3162   if (gtk_icon_source_get_state_wildcarded (source))
3163     {
3164       if (state & GTK_STATE_FLAG_INSENSITIVE)
3165         {
3166           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
3167                                                 gdk_pixbuf_get_width (scaled),
3168                                                 gdk_pixbuf_get_height (scaled));
3169           cr = cairo_create (surface);
3170           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
3171           cairo_paint_with_alpha (cr, 0.5);
3172
3173           cairo_destroy (cr);
3174
3175           g_object_unref (scaled);
3176           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
3177                                                 cairo_image_surface_get_width (surface),
3178                                                 cairo_image_surface_get_height (surface));
3179         }
3180       else if (state & GTK_STATE_FLAG_PRELIGHT)
3181         {
3182           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
3183                                                 gdk_pixbuf_get_width (scaled),
3184                                                 gdk_pixbuf_get_height (scaled));
3185
3186           cr = cairo_create (surface);
3187           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
3188           colorshift_source (cr, 0.10);
3189
3190           cairo_destroy (cr);
3191
3192           g_object_unref (scaled);
3193           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
3194                                                 cairo_image_surface_get_width (surface),
3195                                                 cairo_image_surface_get_height (surface));
3196         }
3197       else
3198         stated = scaled;
3199     }
3200   else
3201     stated = scaled;
3202
3203   return stated;
3204 }
3205
3206 static void
3207 gtk_theming_engine_render_icon (GtkThemingEngine *engine,
3208                                 cairo_t *cr,
3209                                 GdkPixbuf *pixbuf,
3210                                 gdouble x,
3211                                 gdouble y)
3212 {
3213   GtkStateFlags state;
3214   GtkShadow *icon_shadow;
3215
3216   state = gtk_theming_engine_get_state (engine);
3217
3218   cairo_save (cr);
3219
3220   gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
3221
3222   gtk_theming_engine_get (engine, state,
3223                           "icon-shadow", &icon_shadow,
3224                           NULL);
3225
3226   if (icon_shadow != NULL)
3227     {
3228       _gtk_icon_shadow_paint (icon_shadow, cr);
3229       _gtk_shadow_unref (icon_shadow);
3230     }
3231
3232   cairo_paint (cr);
3233
3234   cairo_restore (cr);
3235 }
3236