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
1518   flags = gtk_theming_engine_get_state (engine);
1519
1520   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
1521
1522   gtk_theming_engine_get (engine, flags,
1523                           "background-image", &pattern,
1524                           /* Can't use border-radius as it's an int for
1525                            * backwards compat */
1526                           "border-top-left-radius", &top_left_radius,
1527                           "border-top-right-radius", &top_right_radius,
1528                           "border-bottom-right-radius", &bottom_right_radius,
1529                           "border-bottom-left-radius", &bottom_left_radius,
1530                           NULL);
1531
1532   if (top_left_radius)
1533     border_radius.top_left = *top_left_radius;
1534   g_free (top_left_radius);
1535   if (top_right_radius)
1536     border_radius.top_right = *top_right_radius;
1537   g_free (top_right_radius);
1538   if (bottom_right_radius)
1539     border_radius.bottom_right = *bottom_right_radius;
1540   g_free (bottom_right_radius);
1541   if (bottom_left_radius)
1542     border_radius.bottom_left = *bottom_left_radius;
1543   g_free (bottom_left_radius);
1544
1545   cairo_save (cr);
1546   cairo_translate (cr, x, y);
1547
1548   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1549
1550   if (gtk_theming_engine_has_class (engine, "background"))
1551     {
1552       cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0); /* transparent */
1553       cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
1554       cairo_paint (cr);
1555     }
1556
1557   if (running)
1558     {
1559       cairo_pattern_t *other_pattern;
1560       GtkStateFlags other_flags;
1561       GdkRGBA other_bg;
1562       cairo_pattern_t *new_pattern = NULL;
1563
1564       if (flags & GTK_STATE_FLAG_PRELIGHT)
1565         {
1566           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
1567           progress = 1 - progress;
1568         }
1569       else
1570         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
1571
1572       gtk_theming_engine_get_background_color (engine, other_flags, &other_bg);
1573       gtk_theming_engine_get (engine, other_flags,
1574                               "background-image", &other_pattern,
1575                               NULL);
1576
1577       if (pattern && other_pattern)
1578         {
1579           cairo_pattern_type_t type, other_type;
1580           gint n0, n1;
1581
1582           cairo_pattern_get_color_stop_count (pattern, &n0);
1583           cairo_pattern_get_color_stop_count (other_pattern, &n1);
1584           type = cairo_pattern_get_type (pattern);
1585           other_type = cairo_pattern_get_type (other_pattern);
1586
1587           if (type == other_type && n0 == n1)
1588             {
1589               gdouble offset0, red0, green0, blue0, alpha0;
1590               gdouble offset1, red1, green1, blue1, alpha1;
1591               gdouble x00, x01, y00, y01, x10, x11, y10, y11;
1592               gdouble r00, r01, r10, r11;
1593               guint i;
1594
1595               if (type == CAIRO_PATTERN_TYPE_LINEAR)
1596                 {
1597                   cairo_pattern_get_linear_points (pattern, &x00, &y00, &x01, &y01);
1598                   cairo_pattern_get_linear_points (other_pattern, &x10, &y10, &x11, &y11);
1599
1600                   new_pattern = cairo_pattern_create_linear (x00 + (x10 - x00) * progress,
1601                                                              y00 + (y10 - y00) * progress,
1602                                                              x01 + (x11 - x01) * progress,
1603                                                              y01 + (y11 - y01) * progress);
1604                 }
1605               else
1606                 {
1607                   cairo_pattern_get_radial_circles (pattern, &x00, &y00, &r00, &x01, &y01, &r01);
1608                   cairo_pattern_get_radial_circles (other_pattern, &x10, &y10, &r10, &x11, &y11, &r11);
1609
1610                   new_pattern = cairo_pattern_create_radial (x00 + (x10 - x00) * progress,
1611                                                              y00 + (y10 - y00) * progress,
1612                                                              r00 + (r10 - r00) * progress,
1613                                                              x01 + (x11 - x01) * progress,
1614                                                              y01 + (y11 - y01) * progress,
1615                                                              r01 + (r11 - r01) * progress);
1616                 }
1617
1618               cairo_pattern_set_filter (new_pattern, CAIRO_FILTER_FAST);
1619               i = 0;
1620
1621               /* Blend both gradients into one */
1622               while (i < n0 && i < n1)
1623                 {
1624                   cairo_pattern_get_color_stop_rgba (pattern, i,
1625                                                      &offset0,
1626                                                      &red0, &green0, &blue0,
1627                                                      &alpha0);
1628                   cairo_pattern_get_color_stop_rgba (other_pattern, i,
1629                                                      &offset1,
1630                                                      &red1, &green1, &blue1,
1631                                                      &alpha1);
1632
1633                   cairo_pattern_add_color_stop_rgba (new_pattern,
1634                                                      offset0 + ((offset1 - offset0) * progress),
1635                                                      red0 + ((red1 - red0) * progress),
1636                                                      green0 + ((green1 - green0) * progress),
1637                                                      blue0 + ((blue1 - blue0) * progress),
1638                                                      alpha0 + ((alpha1 - alpha0) * progress));
1639                   i++;
1640                 }
1641             }
1642           else
1643             {
1644               /* Different pattern types, or different color
1645                * stop counts, alpha blend both patterns.
1646                */
1647               _cairo_round_rectangle_sides (cr, &border_radius,
1648                                             0, 0, width, height,
1649                                             SIDE_ALL);
1650
1651               cairo_scale (cr, width, height);
1652               cairo_set_source (cr, other_pattern);
1653               cairo_scale (cr, 1.0 / width, 1.0 / height);
1654               cairo_fill_preserve (cr);
1655
1656               /* Set alpha for posterior drawing
1657                * of the target pattern
1658                */
1659               alpha = 1 - progress;
1660             }
1661         }
1662       else if (pattern || other_pattern)
1663         {
1664           cairo_pattern_t *p;
1665           const GdkRGBA *c;
1666           gdouble x0, y0, x1, y1, r0, r1;
1667           gint n, i;
1668
1669           /* Blend a pattern with a color */
1670           if (pattern)
1671             {
1672               p = pattern;
1673               c = &other_bg;
1674               progress = 1 - progress;
1675             }
1676           else
1677             {
1678               p = other_pattern;
1679               c = &bg_color;
1680             }
1681
1682           if (cairo_pattern_get_type (p) == CAIRO_PATTERN_TYPE_LINEAR)
1683             {
1684               cairo_pattern_get_linear_points (p, &x0, &y0, &x1, &y1);
1685               new_pattern = cairo_pattern_create_linear (x0, y0, x1, y1);
1686             }
1687           else
1688             {
1689               cairo_pattern_get_radial_circles (p, &x0, &y0, &r0, &x1, &y1, &r1);
1690               new_pattern = cairo_pattern_create_radial (x0, y0, r0, x1, y1, r1);
1691             }
1692
1693           cairo_pattern_get_color_stop_count (p, &n);
1694
1695           for (i = 0; i < n; i++)
1696             {
1697               gdouble red1, green1, blue1, alpha1;
1698               gdouble offset;
1699
1700               cairo_pattern_get_color_stop_rgba (p, i,
1701                                                  &offset,
1702                                                  &red1, &green1, &blue1,
1703                                                  &alpha1);
1704               cairo_pattern_add_color_stop_rgba (new_pattern, offset,
1705                                                  c->red + ((red1 - c->red) * progress),
1706                                                  c->green + ((green1 - c->green) * progress),
1707                                                  c->blue + ((blue1 - c->blue) * progress),
1708                                                  c->alpha + ((alpha1 - c->alpha) * progress));
1709             }
1710         }
1711       else
1712         {
1713           /* Merge just colors */
1714           new_pattern = cairo_pattern_create_rgba (CLAMP (bg_color.red + ((other_bg.red - bg_color.red) * progress), 0, 1),
1715                                                    CLAMP (bg_color.green + ((other_bg.green - bg_color.green) * progress), 0, 1),
1716                                                    CLAMP (bg_color.blue + ((other_bg.blue - bg_color.blue) * progress), 0, 1),
1717                                                    CLAMP (bg_color.alpha + ((other_bg.alpha - bg_color.alpha) * progress), 0, 1));
1718         }
1719
1720       if (new_pattern)
1721         {
1722           /* Replace pattern to use */
1723           cairo_pattern_destroy (pattern);
1724           pattern = new_pattern;
1725         }
1726
1727       if (other_pattern)
1728         cairo_pattern_destroy (other_pattern);
1729     }
1730
1731   _cairo_round_rectangle_sides (cr, &border_radius,
1732                                 0, 0, width, height,
1733                                 SIDE_ALL);
1734   if (pattern)
1735     {
1736       cairo_scale (cr, width, height);
1737       cairo_set_source (cr, pattern);
1738       cairo_scale (cr, 1.0 / width, 1.0 / height);
1739     }
1740   else
1741     gdk_cairo_set_source_rgba (cr, &bg_color);
1742
1743   if (alpha == 1)
1744     {
1745       cairo_fill (cr);
1746     }
1747   else
1748     {
1749       cairo_save (cr);
1750       cairo_clip (cr);
1751       cairo_paint_with_alpha (cr, alpha);
1752       cairo_restore (cr);
1753     }
1754
1755   if (pattern)
1756     cairo_pattern_destroy (pattern);
1757
1758   cairo_restore (cr);
1759 }
1760
1761 static void
1762 gtk_theming_engine_render_background (GtkThemingEngine *engine,
1763                                       cairo_t          *cr,
1764                                       gdouble           x,
1765                                       gdouble           y,
1766                                       gdouble           width,
1767                                       gdouble           height)
1768 {
1769   GtkJunctionSides junction;
1770
1771   junction = gtk_theming_engine_get_junction_sides (engine);
1772
1773   render_background_internal (engine, cr,
1774                               x, y, width, height,
1775                               junction);
1776 }
1777
1778 /* Renders the small triangle on corners so
1779  * frames with 0 radius have a 3D-like effect
1780  */
1781 static void
1782 _cairo_corner_triangle (cairo_t *cr,
1783                         gdouble  x,
1784                         gdouble  y,
1785                         gint     size)
1786 {
1787   gint i;
1788
1789   cairo_move_to (cr, x + 0.5, y + size - 0.5);
1790   cairo_line_to (cr, x + size - 0.5, y + size - 0.5);
1791   cairo_line_to (cr, x + size - 0.5, y + 0.5);
1792
1793   for (i = 1; i < size - 1; i++)
1794     {
1795       cairo_move_to (cr, x + size - 0.5, y + i + 0.5);
1796       cairo_line_to (cr, x + (size - i) - 0.5, y + i + 0.5);
1797     }
1798 }
1799
1800 static void
1801 gtk_themeing_engine_apply_junction_to_radius (GtkCssBorderRadius *border_radius,
1802                                               GtkJunctionSides    junction)
1803 {
1804   if (junction & GTK_JUNCTION_CORNER_TOPLEFT)
1805     border_radius->top_left.horizontal = border_radius->top_left.vertical = 0;
1806   if (junction & GTK_JUNCTION_CORNER_TOPRIGHT)
1807     border_radius->top_right.horizontal = border_radius->top_right.vertical = 0;
1808   if (junction & GTK_JUNCTION_CORNER_BOTTOMRIGHT)
1809     border_radius->bottom_right.horizontal = border_radius->bottom_right.vertical = 0;
1810   if (junction & GTK_JUNCTION_CORNER_BOTTOMLEFT)
1811     border_radius->bottom_left.horizontal = border_radius->bottom_left.vertical = 0;
1812 }
1813
1814 static void
1815 render_frame_internal (GtkThemingEngine *engine,
1816                        cairo_t          *cr,
1817                        gdouble           x,
1818                        gdouble           y,
1819                        gdouble           width,
1820                        gdouble           height,
1821                        guint             hidden_side,
1822                        GtkJunctionSides  junction)
1823 {
1824   GtkStateFlags state;
1825   GdkRGBA lighter;
1826   GdkRGBA border_color;
1827   GtkBorderStyle border_style;
1828   gint border_width;
1829   GtkCssBorderCornerRadius *top_left_radius, *top_right_radius;
1830   GtkCssBorderCornerRadius *bottom_left_radius, *bottom_right_radius;
1831   GtkCssBorderRadius border_radius = { { 0, },  };
1832   gdouble progress, d1, d2;
1833   gboolean running;
1834   GtkBorder border;
1835   gboolean uniform_border;
1836
1837   state = gtk_theming_engine_get_state (engine);
1838
1839   gtk_theming_engine_get_border_color (engine, state, &border_color);
1840   gtk_theming_engine_get_border (engine, state, &border);
1841
1842   gtk_theming_engine_get (engine, state,
1843                           "border-style", &border_style,
1844                           /* Can't use border-radius as it's an int for
1845                            * backwards compat */
1846                           "border-top-left-radius", &top_left_radius,
1847                           "border-top-right-radius", &top_right_radius,
1848                           "border-bottom-right-radius", &bottom_right_radius,
1849                           "border-bottom-left-radius", &bottom_left_radius,
1850                           NULL);
1851
1852   if (top_left_radius)
1853     border_radius.top_left = *top_left_radius;
1854   g_free (top_left_radius);
1855   if (top_right_radius)
1856     border_radius.top_right = *top_right_radius;
1857   g_free (top_right_radius);
1858   if (bottom_right_radius)
1859     border_radius.bottom_right = *bottom_right_radius;
1860   g_free (bottom_right_radius);
1861   if (bottom_left_radius)
1862     border_radius.bottom_left = *bottom_left_radius;
1863   g_free (bottom_left_radius);
1864
1865   gtk_themeing_engine_apply_junction_to_radius (&border_radius, junction);
1866
1867   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1868   border_width = MIN (MIN (border.top, border.bottom),
1869                       MIN (border.left, border.right));
1870   uniform_border = (border.top == border.bottom &&
1871                     border.top == border.left &&
1872                     border.top == border.right);
1873
1874   if (running)
1875     {
1876       GtkStateFlags other_state;
1877       GdkRGBA other_color;
1878
1879       if (state & GTK_STATE_FLAG_PRELIGHT)
1880         {
1881           other_state = state & ~(GTK_STATE_FLAG_PRELIGHT);
1882           progress = 1 - progress;
1883         }
1884       else
1885         other_state = state | GTK_STATE_FLAG_PRELIGHT;
1886
1887       gtk_theming_engine_get_border_color (engine, other_state, &other_color);
1888
1889       border_color.red = CLAMP (border_color.red + ((other_color.red - border_color.red) * progress), 0, 1);
1890       border_color.green = CLAMP (border_color.green + ((other_color.green - border_color.green) * progress), 0, 1);
1891       border_color.blue = CLAMP (border_color.blue + ((other_color.blue - border_color.blue) * progress), 0, 1);
1892       border_color.alpha = CLAMP (border_color.alpha + ((other_color.alpha - border_color.alpha) * progress), 0, 1);
1893     }
1894
1895   cairo_save (cr);
1896
1897   color_shade (&border_color, 1.8, &lighter);
1898
1899   switch (border_style)
1900     {
1901     case GTK_BORDER_STYLE_NONE:
1902       break;
1903     case GTK_BORDER_STYLE_SOLID:
1904       cairo_set_line_width (cr, border_width);
1905       cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
1906
1907       gdk_cairo_set_source_rgba (cr, &border_color);
1908
1909       cairo_save (cr);
1910       _cairo_uneven_frame (cr, &border_radius,
1911                            x, y, width, height,
1912                            &border);
1913       cairo_fill (cr);
1914       cairo_restore (cr);
1915
1916       break;
1917     case GTK_BORDER_STYLE_INSET:
1918     case GTK_BORDER_STYLE_OUTSET:
1919       cairo_set_line_width (cr, border_width);
1920       cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
1921
1922       if (border_width > 1)
1923         {
1924           d1 = (gdouble) border_width / 2;
1925           d2 = border_width;
1926         }
1927       else
1928         {
1929           d1 = 0.5;
1930           d2 = 1;
1931         }
1932
1933       cairo_save (cr);
1934
1935       if (uniform_border)
1936         {
1937           if (border_style == GTK_BORDER_STYLE_INSET)
1938             gdk_cairo_set_source_rgba (cr, &lighter);
1939           else
1940             gdk_cairo_set_source_rgba (cr, &border_color);
1941
1942           _cairo_round_rectangle_sides (cr, &border_radius,
1943                                         x + d1, y + d1,
1944                                         width - d2, height - d2,
1945                                         (SIDE_BOTTOM | SIDE_RIGHT) & ~(hidden_side));
1946           cairo_stroke (cr);
1947
1948           if (border_style == GTK_BORDER_STYLE_INSET)
1949             gdk_cairo_set_source_rgba (cr, &border_color);
1950           else
1951             gdk_cairo_set_source_rgba (cr, &lighter);
1952
1953           _cairo_round_rectangle_sides (cr, &border_radius,
1954                                         x + d1, y + d1,
1955                                         width - d2, height - d2,
1956                                         (SIDE_TOP | SIDE_LEFT) & ~(hidden_side));
1957           cairo_stroke (cr);
1958         }
1959       else
1960         {
1961           cairo_save (cr);
1962
1963           /* Bottom/right */
1964           if (border_style == GTK_BORDER_STYLE_INSET)
1965             gdk_cairo_set_source_rgba (cr, &lighter);
1966           else
1967             gdk_cairo_set_source_rgba (cr, &border_color);
1968
1969           _cairo_uneven_frame (cr, &border_radius,
1970                                x, y, width, height,
1971                                &border);
1972           cairo_fill (cr);
1973
1974           /* Top/left */
1975           cairo_move_to (cr, x, y);
1976           cairo_line_to (cr, x + width, y);
1977           cairo_line_to (cr,
1978                          x + width - border.right - border_radius.top_right.horizontal / 2,
1979                          y + border.top + border_radius.top_right.vertical / 2);
1980           cairo_line_to (cr,
1981                          x + width - border.right - border_radius.bottom_right.horizontal / 2,
1982                          y + height - border.bottom - border_radius.bottom_right.vertical / 2);
1983           cairo_line_to (cr,
1984                          x + border.left + border_radius.bottom_left.horizontal / 2,
1985                          y + height - border.bottom - border_radius.bottom_left.vertical / 2);
1986           cairo_line_to (cr, x, y + height);
1987           cairo_close_path (cr);
1988
1989           cairo_clip (cr);
1990
1991           if (border_style == GTK_BORDER_STYLE_INSET)
1992             gdk_cairo_set_source_rgba (cr, &border_color);
1993           else
1994             gdk_cairo_set_source_rgba (cr, &lighter);
1995
1996           _cairo_uneven_frame (cr, &border_radius,
1997                                x, y, width, height,
1998                                &border);
1999           cairo_fill (cr);
2000           cairo_restore (cr);
2001         }
2002
2003       if (border_width > 1)
2004         {
2005           /* overprint top/right and bottom/left corner
2006            * triangles if there are square corners there,
2007            * to give the box a 3D-like appearance.
2008            */
2009           cairo_save (cr);
2010
2011           if (border_style == GTK_BORDER_STYLE_INSET)
2012             gdk_cairo_set_source_rgba (cr, &lighter);
2013           else
2014             gdk_cairo_set_source_rgba (cr, &border_color);
2015
2016           cairo_set_line_width (cr, 1);
2017
2018           if ((junction & GTK_JUNCTION_CORNER_TOPRIGHT) != 0)
2019             _cairo_corner_triangle (cr,
2020                                     x + width - border_width, y,
2021                                     border_width);
2022
2023           if ((junction & GTK_JUNCTION_CORNER_BOTTOMLEFT) != 0)
2024             _cairo_corner_triangle (cr,
2025                                     x, y + height - border_width,
2026                                     border_width);
2027           cairo_stroke (cr);
2028           cairo_restore (cr);
2029         }
2030
2031       cairo_restore (cr);
2032       break;
2033     }
2034
2035   cairo_restore (cr);
2036 }
2037
2038 static void
2039 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
2040                                  cairo_t          *cr,
2041                                  gdouble           x,
2042                                  gdouble           y,
2043                                  gdouble           width,
2044                                  gdouble           height)
2045 {
2046   GtkStateFlags flags;
2047   GtkBorderStyle border_style;
2048   GtkJunctionSides junction;
2049   GtkBorderImage *border_image;
2050   GtkBorder border;
2051
2052   flags = gtk_theming_engine_get_state (engine);
2053   junction = gtk_theming_engine_get_junction_sides (engine);
2054   gtk_theming_engine_get_border (engine, flags, &border);
2055
2056   gtk_theming_engine_get (engine, flags,
2057                           "border-image", &border_image,
2058                           "border-style", &border_style,
2059                           NULL);
2060
2061   if (border_image != NULL)
2062     {
2063       _gtk_border_image_render (border_image, &border,
2064                                 cr, x, y, width, height);
2065       _gtk_border_image_unref (border_image);
2066     }
2067   else if (border_style != GTK_BORDER_STYLE_NONE)
2068     render_frame_internal (engine, cr,
2069                            x, y, width, height,
2070                            0, junction);
2071 }
2072
2073 static void
2074 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
2075                                     cairo_t          *cr,
2076                                     gdouble           x,
2077                                     gdouble           y,
2078                                     gdouble           width,
2079                                     gdouble           height)
2080 {
2081   GtkStateFlags flags;
2082   GdkRGBA outline_color, fg_color;
2083   double vertical_overshoot;
2084   int diameter;
2085   double radius;
2086   double interp;                /* interpolation factor for center position */
2087   double x_double_horz, y_double_horz;
2088   double x_double_vert, y_double_vert;
2089   double x_double, y_double;
2090   gdouble angle;
2091   gint line_width;
2092   gboolean running, is_rtl;
2093   gdouble progress;
2094
2095   cairo_save (cr);
2096   flags = gtk_theming_engine_get_state (engine);
2097
2098   gtk_theming_engine_get_color (engine, flags, &fg_color);
2099   gtk_theming_engine_get_border_color (engine, flags, &outline_color);
2100
2101   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
2102   is_rtl = (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL);
2103   line_width = 1;
2104
2105   if (!running)
2106     progress = (flags & GTK_STATE_FLAG_ACTIVE) ? 1 : 0;
2107
2108   if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_HORIZONTAL))
2109     {
2110       if (is_rtl)
2111         angle = (G_PI) - ((G_PI / 2) * progress);
2112       else
2113         angle = (G_PI / 2) * progress;
2114     }
2115   else
2116     {
2117       if (is_rtl)
2118         angle = (G_PI / 2) + ((G_PI / 2) * progress);
2119       else
2120         angle = (G_PI / 2) - ((G_PI / 2) * progress);
2121     }
2122
2123   interp = progress;
2124
2125   /* Compute distance that the stroke extends beyonds the end
2126    * of the triangle we draw.
2127    */
2128   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
2129
2130   /* For odd line widths, we end the vertical line of the triangle
2131    * at a half pixel, so we round differently.
2132    */
2133   if (line_width % 2 == 1)
2134     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
2135   else
2136     vertical_overshoot = ceil (vertical_overshoot);
2137
2138   /* Adjust the size of the triangle we draw so that the entire stroke fits
2139    */
2140   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
2141
2142   /* If the line width is odd, we want the diameter to be even,
2143    * and vice versa, so force the sum to be odd. This relationship
2144    * makes the point of the triangle look right.
2145    */
2146   diameter -= (1 - (diameter + line_width) % 2);
2147
2148   radius = diameter / 2.;
2149
2150   /* Adjust the center so that the stroke is properly aligned with
2151    * the pixel grid. The center adjustment is different for the
2152    * horizontal and vertical orientations. For intermediate positions
2153    * we interpolate between the two.
2154    */
2155   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
2156   y_double_vert = (y + height / 2) - 0.5;
2157
2158   x_double_horz = (x + width / 2) - 0.5;
2159   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
2160
2161   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
2162   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
2163
2164   cairo_translate (cr, x_double, y_double);
2165   cairo_rotate (cr, angle);
2166
2167   cairo_move_to (cr, - radius / 2., - radius);
2168   cairo_line_to (cr,   radius / 2.,   0);
2169   cairo_line_to (cr, - radius / 2.,   radius);
2170   cairo_close_path (cr);
2171
2172   cairo_set_line_width (cr, line_width);
2173
2174   gdk_cairo_set_source_rgba (cr, &fg_color);
2175
2176   cairo_fill_preserve (cr);
2177
2178   gdk_cairo_set_source_rgba (cr, &outline_color);
2179   cairo_stroke (cr);
2180
2181   cairo_restore (cr);
2182 }
2183
2184 static void
2185 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
2186                                  cairo_t          *cr,
2187                                  gdouble           x,
2188                                  gdouble           y,
2189                                  gdouble           width,
2190                                  gdouble           height)
2191 {
2192   GtkStateFlags flags;
2193   GdkRGBA color;
2194   gint line_width;
2195   gint8 *dash_list;
2196
2197   cairo_save (cr);
2198   flags = gtk_theming_engine_get_state (engine);
2199
2200   gtk_theming_engine_get_color (engine, flags, &color);
2201
2202   gtk_theming_engine_get_style (engine,
2203                                 "focus-line-width", &line_width,
2204                                 "focus-line-pattern", (gchar *) &dash_list,
2205                                 NULL);
2206
2207   cairo_set_line_width (cr, (gdouble) line_width);
2208
2209   if (dash_list[0])
2210     {
2211       gint n_dashes = strlen ((const gchar *) dash_list);
2212       gdouble *dashes = g_new (gdouble, n_dashes);
2213       gdouble total_length = 0;
2214       gdouble dash_offset;
2215       gint i;
2216
2217       for (i = 0; i < n_dashes; i++)
2218         {
2219           dashes[i] = dash_list[i];
2220           total_length += dash_list[i];
2221         }
2222
2223       /* The dash offset here aligns the pattern to integer pixels
2224        * by starting the dash at the right side of the left border
2225        * Negative dash offsets in cairo don't work
2226        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
2227        */
2228       dash_offset = - line_width / 2.;
2229
2230       while (dash_offset < 0)
2231         dash_offset += total_length;
2232
2233       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
2234       g_free (dashes);
2235     }
2236
2237   cairo_rectangle (cr,
2238                    x + line_width / 2.,
2239                    y + line_width / 2.,
2240                    width - line_width,
2241                    height - line_width);
2242
2243   gdk_cairo_set_source_rgba (cr, &color);
2244   cairo_stroke (cr);
2245
2246   cairo_restore (cr);
2247
2248   g_free (dash_list);
2249 }
2250
2251 static void
2252 gtk_theming_engine_render_line (GtkThemingEngine *engine,
2253                                 cairo_t          *cr,
2254                                 gdouble           x0,
2255                                 gdouble           y0,
2256                                 gdouble           x1,
2257                                 gdouble           y1)
2258 {
2259   GdkRGBA bg_color, darker, lighter;
2260   GtkStateFlags flags;
2261   gint i, thickness, thickness_dark, thickness_light, len;
2262   cairo_matrix_t matrix;
2263   gdouble angle;
2264
2265   /* FIXME: thickness */
2266   thickness = 2;
2267   thickness_dark = thickness / 2;
2268   thickness_light = thickness - thickness_dark;
2269
2270   flags = gtk_theming_engine_get_state (engine);
2271   cairo_save (cr);
2272
2273   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2274   color_shade (&bg_color, 0.7, &darker);
2275   color_shade (&bg_color, 1.3, &lighter);
2276
2277   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
2278   cairo_set_line_width (cr, 1);
2279
2280   angle = atan2 (x1 - x0, y1 - y0);
2281   angle = (2 * G_PI) - angle;
2282   angle += G_PI / 2;
2283
2284   cairo_get_matrix (cr, &matrix);
2285   cairo_matrix_translate (&matrix, x0, y0);
2286   cairo_matrix_rotate (&matrix, angle);
2287   cairo_set_matrix (cr, &matrix);
2288
2289   x1 -= x0;
2290   y1 -= y0;
2291
2292   len = (gint) sqrt ((x1 * x1) + (y1 * y1));
2293
2294   y0 = -thickness_dark;
2295
2296   for (i = 0; i < thickness_dark; i++)
2297     {
2298       gdk_cairo_set_source_rgba (cr, &lighter);
2299       add_path_line (cr, len - i - 1.5, y0, len - 0.5, y0);
2300       cairo_stroke (cr);
2301
2302       gdk_cairo_set_source_rgba (cr, &darker);
2303       add_path_line (cr, 0.5, y0, len - i - 1.5, y0);
2304       cairo_stroke (cr);
2305
2306       y0++;
2307     }
2308
2309   for (i = 0; i < thickness_light; i++)
2310     {
2311       gdk_cairo_set_source_rgba (cr, &darker);
2312       add_path_line (cr, 0.5, y0, thickness_light - i + 0.5, y0);
2313       cairo_stroke (cr);
2314
2315       gdk_cairo_set_source_rgba (cr, &lighter);
2316       add_path_line (cr, thickness_light - i + 0.5, y0, len - 0.5, y0);
2317       cairo_stroke (cr);
2318
2319       y0++;
2320     }
2321
2322   cairo_restore (cr);
2323 }
2324
2325 static void
2326 prepare_context_for_layout (cairo_t *cr,
2327                             gdouble x,
2328                             gdouble y,
2329                             PangoLayout *layout)
2330 {
2331   const PangoMatrix *matrix;
2332
2333   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2334
2335   cairo_move_to (cr, x, y);
2336
2337   if (matrix)
2338     {
2339       cairo_matrix_t cairo_matrix;
2340
2341       cairo_matrix_init (&cairo_matrix,
2342                          matrix->xx, matrix->yx,
2343                          matrix->xy, matrix->yy,
2344                          matrix->x0, matrix->y0);
2345
2346       cairo_transform (cr, &cairo_matrix);
2347     }
2348 }
2349
2350 static void
2351 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2352                                   cairo_t          *cr,
2353                                   gdouble           x,
2354                                   gdouble           y,
2355                                   PangoLayout      *layout)
2356 {
2357   GdkRGBA fg_color;
2358   GtkShadow *text_shadow = NULL;
2359   GtkStateFlags flags;
2360   gdouble progress;
2361   gboolean running;
2362
2363   cairo_save (cr);
2364   flags = gtk_theming_engine_get_state (engine);
2365   gtk_theming_engine_get_color (engine, flags, &fg_color);
2366
2367   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
2368
2369   if (running)
2370     {
2371       GtkStateFlags other_flags;
2372       GdkRGBA other_fg;
2373
2374       if (flags & GTK_STATE_FLAG_PRELIGHT)
2375         {
2376           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
2377           progress = 1 - progress;
2378         }
2379       else
2380         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
2381
2382       gtk_theming_engine_get_color (engine, other_flags, &other_fg);
2383
2384       fg_color.red = CLAMP (fg_color.red + ((other_fg.red - fg_color.red) * progress), 0, 1);
2385       fg_color.green = CLAMP (fg_color.green + ((other_fg.green - fg_color.green) * progress), 0, 1);
2386       fg_color.blue = CLAMP (fg_color.blue + ((other_fg.blue - fg_color.blue) * progress), 0, 1);
2387       fg_color.alpha = CLAMP (fg_color.alpha + ((other_fg.alpha - fg_color.alpha) * progress), 0, 1);
2388     }
2389
2390   gtk_theming_engine_get (engine, flags,
2391                           "text-shadow", &text_shadow,
2392                           NULL);
2393
2394   prepare_context_for_layout (cr, x, y, layout);
2395
2396   if (text_shadow != NULL)
2397     {
2398       _gtk_text_shadow_paint_layout (text_shadow, cr, layout);
2399       _gtk_shadow_unref (text_shadow);
2400     }
2401
2402   gdk_cairo_set_source_rgba (cr, &fg_color);
2403   pango_cairo_show_layout (cr, layout);
2404
2405   cairo_restore (cr);
2406 }
2407
2408 static void
2409 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2410                                   cairo_t          *cr,
2411                                   gdouble           x,
2412                                   gdouble           y,
2413                                   gdouble           width,
2414                                   gdouble           height,
2415                                   GtkOrientation    orientation)
2416 {
2417   const GtkWidgetPath *path;
2418   gint thickness;
2419
2420   path = gtk_theming_engine_get_path (engine);
2421
2422   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2423   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2424
2425   /* FIXME: thickness */
2426   thickness = 2;
2427
2428   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
2429     {
2430       if (orientation == GTK_ORIENTATION_VERTICAL)
2431         gtk_theming_engine_render_line (engine, cr,
2432                                         x + thickness,
2433                                         y + (gint) height / 2,
2434                                         x + width - thickness - 1,
2435                                         y + (gint) height / 2);
2436       else
2437         gtk_theming_engine_render_line (engine, cr,
2438                                         x + (gint) width / 2,
2439                                         y + thickness,
2440                                         x + (gint) width / 2,
2441                                         y + height - thickness - 1);
2442     }
2443 }
2444
2445 static void
2446 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2447                                      cairo_t          *cr,
2448                                      gdouble           x,
2449                                      gdouble           y,
2450                                      gdouble           width,
2451                                      gdouble           height,
2452                                      GtkPositionType   gap_side,
2453                                      gdouble           xy0_gap,
2454                                      gdouble           xy1_gap)
2455 {
2456   GtkJunctionSides junction;
2457   GtkStateFlags state;
2458   gint border_width;
2459   GtkCssBorderCornerRadius *top_left_radius, *top_right_radius;
2460   GtkCssBorderCornerRadius *bottom_left_radius, *bottom_right_radius;
2461   GtkCssBorderRadius border_radius = { { 0, },  };
2462   gdouble x0, y0, x1, y1, xc, yc, wc, hc;
2463   GtkBorder border;
2464
2465   xc = yc = wc = hc = 0;
2466   state = gtk_theming_engine_get_state (engine);
2467   junction = gtk_theming_engine_get_junction_sides (engine);
2468
2469   gtk_theming_engine_get_border (engine, state, &border);
2470   gtk_theming_engine_get (engine, state,
2471                           /* Can't use border-radius as it's an int for
2472                            * backwards compat */
2473                           "border-top-left-radius", &top_left_radius,
2474                           "border-top-right-radius", &top_right_radius,
2475                           "border-bottom-right-radius", &bottom_right_radius,
2476                           "border-bottom-left-radius", &bottom_left_radius,
2477                           NULL);
2478
2479   if (top_left_radius)
2480     border_radius.top_left = *top_left_radius;
2481   g_free (top_left_radius);
2482   if (top_right_radius)
2483     border_radius.top_right = *top_right_radius;
2484   g_free (top_right_radius);
2485   if (bottom_right_radius)
2486     border_radius.bottom_right = *bottom_right_radius;
2487   g_free (bottom_right_radius);
2488   if (bottom_left_radius)
2489     border_radius.bottom_left = *bottom_left_radius;
2490   g_free (bottom_left_radius);
2491
2492   border_width = MIN (MIN (border.top, border.bottom),
2493                       MIN (border.left, border.right));
2494
2495   cairo_save (cr);
2496
2497   switch (gap_side)
2498     {
2499     case GTK_POS_TOP:
2500       xc = x + xy0_gap + border_width;
2501       yc = y;
2502       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2503       hc = border_width;
2504
2505       if (xy0_gap < border_radius.top_left.horizontal)
2506         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2507
2508       if (xy1_gap > width - border_radius.top_right.horizontal)
2509         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2510       break;
2511     case GTK_POS_BOTTOM:
2512       xc = x + xy0_gap + border_width;
2513       yc = y + height - border_width;
2514       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2515       hc = border_width;
2516
2517       if (xy0_gap < border_radius.bottom_left.horizontal)
2518         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2519
2520       if (xy1_gap > width - border_radius.bottom_right.horizontal)
2521         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2522
2523       break;
2524     case GTK_POS_LEFT:
2525       xc = x;
2526       yc = y + xy0_gap + border_width;
2527       wc = border_width;
2528       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2529
2530       if (xy0_gap < border_radius.top_left.vertical)
2531         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2532
2533       if (xy1_gap > height - border_radius.bottom_left.vertical)
2534         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2535
2536       break;
2537     case GTK_POS_RIGHT:
2538       xc = x + width - border_width;
2539       yc = y + xy0_gap + border_width;
2540       wc = border_width;
2541       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2542
2543       if (xy0_gap < border_radius.top_right.vertical)
2544         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2545
2546       if (xy1_gap > height - border_radius.bottom_right.vertical)
2547         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2548
2549       break;
2550     }
2551
2552   cairo_clip_extents (cr, &x0, &y0, &x1, &y1);
2553   cairo_rectangle (cr, x0, y0, x1 - x0, yc - y0);
2554   cairo_rectangle (cr, x0, yc, xc - x0, hc);
2555   cairo_rectangle (cr, xc + wc, yc, x1 - (xc + wc), hc);
2556   cairo_rectangle (cr, x0, yc + hc, x1 - x0, y1 - (yc + hc));
2557   cairo_clip (cr);
2558
2559   render_frame_internal (engine, cr,
2560                          x, y, width, height,
2561                          0, junction);
2562
2563   cairo_restore (cr);
2564 }
2565
2566 static void
2567 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2568                                      cairo_t          *cr,
2569                                      gdouble           x,
2570                                      gdouble           y,
2571                                      gdouble           width,
2572                                      gdouble           height,
2573                                      GtkPositionType   gap_side)
2574 {
2575   GtkJunctionSides junction = 0;
2576   guint hidden_side = 0;
2577
2578   cairo_save (cr);
2579
2580   switch (gap_side)
2581     {
2582     case GTK_POS_LEFT:
2583       junction = GTK_JUNCTION_LEFT;
2584       hidden_side = SIDE_LEFT;
2585
2586       cairo_translate (cr, x + width, y);
2587       cairo_rotate (cr, G_PI / 2);
2588       break;
2589     case GTK_POS_RIGHT:
2590       junction = GTK_JUNCTION_RIGHT;
2591       hidden_side = SIDE_RIGHT;
2592
2593       cairo_translate (cr, x, y + height);
2594       cairo_rotate (cr, - G_PI / 2);
2595       break;
2596     case GTK_POS_TOP:
2597       junction = GTK_JUNCTION_TOP;
2598       hidden_side = SIDE_TOP;
2599
2600       cairo_translate (cr, x + width, y + height);
2601       cairo_rotate (cr, G_PI);
2602       break;
2603     case GTK_POS_BOTTOM:
2604       junction = GTK_JUNCTION_BOTTOM;
2605       hidden_side = SIDE_BOTTOM;
2606
2607       cairo_translate (cr, x, y);
2608       break;
2609     }
2610
2611   if (gap_side == GTK_POS_TOP ||
2612       gap_side == GTK_POS_BOTTOM)
2613     render_background_internal (engine, cr,
2614                                 0, 0, width, height,
2615                                 GTK_JUNCTION_BOTTOM);
2616   else
2617     render_background_internal (engine, cr,
2618                                 0, 0, height, width,
2619                                 GTK_JUNCTION_BOTTOM);
2620   cairo_restore (cr);
2621
2622   cairo_save (cr);
2623
2624   render_frame_internal (engine, cr,
2625                          x, y, width, height,
2626                          hidden_side, junction);
2627
2628   cairo_restore (cr);
2629 }
2630
2631 static void
2632 render_dot (cairo_t       *cr,
2633             const GdkRGBA *lighter,
2634             const GdkRGBA *darker,
2635             gdouble        x,
2636             gdouble        y,
2637             gdouble        size)
2638 {
2639   size = CLAMP ((gint) size, 2, 3);
2640
2641   if (size == 2)
2642     {
2643       gdk_cairo_set_source_rgba (cr, lighter);
2644       cairo_rectangle (cr, x, y, 1, 1);
2645       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2646       cairo_fill (cr);
2647     }
2648   else if (size == 3)
2649     {
2650       gdk_cairo_set_source_rgba (cr, lighter);
2651       cairo_rectangle (cr, x, y, 2, 1);
2652       cairo_rectangle (cr, x, y, 1, 2);
2653       cairo_fill (cr);
2654
2655       gdk_cairo_set_source_rgba (cr, darker);
2656       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2657       cairo_rectangle (cr, x + 2, y, 1, 2);
2658       cairo_fill (cr);
2659     }
2660 }
2661
2662 static void
2663 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2664                                   cairo_t          *cr,
2665                                   gdouble           x,
2666                                   gdouble           y,
2667                                   gdouble           width,
2668                                   gdouble           height)
2669 {
2670   GtkStateFlags flags;
2671   GdkRGBA bg_color, lighter, darker;
2672   GtkJunctionSides sides;
2673   gint xx, yy;
2674
2675   cairo_save (cr);
2676   flags = gtk_theming_engine_get_state (engine);
2677
2678   cairo_set_line_width (cr, 1.0);
2679   sides = gtk_theming_engine_get_junction_sides (engine);
2680   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2681
2682   color_shade (&bg_color, 0.7, &darker);
2683   color_shade (&bg_color, 1.3, &lighter);
2684
2685   render_background_internal (engine, cr, x, y, width, height, sides);
2686
2687   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_GRIP))
2688     {
2689       /* reduce confusing values to a meaningful state */
2690       if ((sides & (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)) == (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT))
2691         sides &= ~GTK_JUNCTION_CORNER_TOPLEFT;
2692
2693       if ((sides & (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT)) == (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT))
2694         sides &= ~GTK_JUNCTION_CORNER_TOPRIGHT;
2695
2696       if (sides == 0)
2697         sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2698
2699       /* align drawing area to the connected side */
2700       if (sides == GTK_JUNCTION_LEFT)
2701         {
2702           if (height < width)
2703             width = height;
2704         }
2705       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2706         {
2707           if (width < height)
2708             height = width;
2709           else if (height < width)
2710             width = height;
2711         }
2712       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2713         {
2714           /* make it square, aligning to bottom left */
2715           if (width < height)
2716             {
2717               y += (height - width);
2718               height = width;
2719             }
2720           else if (height < width)
2721             width = height;
2722         }
2723       else if (sides == GTK_JUNCTION_RIGHT)
2724         {
2725           /* aligning to right */
2726           if (height < width)
2727             {
2728               x += (width - height);
2729               width = height;
2730             }
2731         }
2732       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2733         {
2734           if (width < height)
2735             height = width;
2736           else if (height < width)
2737             {
2738               x += (width - height);
2739               width = height;
2740             }
2741         }
2742       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2743         {
2744           /* make it square, aligning to bottom right */
2745           if (width < height)
2746             {
2747               y += (height - width);
2748               height = width;
2749             }
2750           else if (height < width)
2751             {
2752               x += (width - height);
2753               width = height;
2754             }
2755         }
2756       else if (sides == GTK_JUNCTION_TOP)
2757         {
2758           if (width < height)
2759             height = width;
2760         }
2761       else if (sides == GTK_JUNCTION_BOTTOM)
2762         {
2763           /* align to bottom */
2764           if (width < height)
2765             {
2766               y += (height - width);
2767               height = width;
2768             }
2769         }
2770       else
2771         g_assert_not_reached ();
2772
2773       if (sides == GTK_JUNCTION_LEFT ||
2774           sides == GTK_JUNCTION_RIGHT)
2775         {
2776           gint xi;
2777
2778           xi = x;
2779
2780           while (xi < x + width)
2781             {
2782               gdk_cairo_set_source_rgba (cr, &lighter);
2783               add_path_line (cr, x, y, x, y + height);
2784               cairo_stroke (cr);
2785               xi++;
2786
2787               gdk_cairo_set_source_rgba (cr, &darker);
2788               add_path_line (cr, xi, y, xi, y + height);
2789               cairo_stroke (cr);
2790               xi += 2;
2791             }
2792         }
2793       else if (sides == GTK_JUNCTION_TOP ||
2794                sides == GTK_JUNCTION_BOTTOM)
2795         {
2796           gint yi;
2797
2798           yi = y;
2799
2800           while (yi < y + height)
2801             {
2802               gdk_cairo_set_source_rgba (cr, &lighter);
2803               add_path_line (cr, x, yi, x + width, yi);
2804               cairo_stroke (cr);
2805               yi++;
2806
2807               gdk_cairo_set_source_rgba (cr, &darker);
2808               add_path_line (cr, x, yi, x + width, yi);
2809               cairo_stroke (cr);
2810               yi += 2;
2811             }
2812         }
2813       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2814         {
2815           gint xi, yi;
2816
2817           xi = x + width;
2818           yi = y + height;
2819
2820           while (xi > x + 3)
2821             {
2822               gdk_cairo_set_source_rgba (cr, &darker);
2823               add_path_line (cr, xi, y, x, yi);
2824               cairo_stroke (cr);
2825
2826               --xi;
2827               --yi;
2828
2829               add_path_line (cr, xi, y, x, yi);
2830               cairo_stroke (cr);
2831
2832               --xi;
2833               --yi;
2834
2835               gdk_cairo_set_source_rgba (cr, &lighter);
2836               add_path_line (cr, xi, y, x, yi);
2837               cairo_stroke (cr);
2838
2839               xi -= 3;
2840               yi -= 3;
2841             }
2842         }
2843       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2844         {
2845           gint xi, yi;
2846
2847           xi = x;
2848           yi = y + height;
2849
2850           while (xi < (x + width - 3))
2851             {
2852               gdk_cairo_set_source_rgba (cr, &lighter);
2853               add_path_line (cr, xi, y, x + width, yi);
2854               cairo_stroke (cr);
2855
2856               ++xi;
2857               --yi;
2858
2859               gdk_cairo_set_source_rgba (cr, &darker);
2860               add_path_line (cr, xi, y, x + width, yi);
2861               cairo_stroke (cr);
2862
2863               ++xi;
2864               --yi;
2865
2866               add_path_line (cr, xi, y, x + width, yi);
2867               cairo_stroke (cr);
2868
2869               xi += 3;
2870               yi -= 3;
2871             }
2872         }
2873       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2874         {
2875           gint xi, yi;
2876
2877           xi = x + width;
2878           yi = y;
2879
2880           while (xi > x + 3)
2881             {
2882               gdk_cairo_set_source_rgba (cr, &darker);
2883               add_path_line (cr, x, yi, xi, y + height);
2884               cairo_stroke (cr);
2885
2886               --xi;
2887               ++yi;
2888
2889               add_path_line (cr, x, yi, xi, y + height);
2890               cairo_stroke (cr);
2891
2892               --xi;
2893               ++yi;
2894
2895               gdk_cairo_set_source_rgba (cr, &lighter);
2896               add_path_line (cr, x, yi, xi, y + height);
2897               cairo_stroke (cr);
2898
2899               xi -= 3;
2900               yi += 3;
2901             }
2902         }
2903       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2904         {
2905           gint xi, yi;
2906
2907           xi = x;
2908           yi = y;
2909
2910           while (xi < (x + width - 3))
2911             {
2912               gdk_cairo_set_source_rgba (cr, &lighter);
2913               add_path_line (cr, xi, y + height, x + width, yi);
2914               cairo_stroke (cr);
2915
2916               ++xi;
2917               ++yi;
2918
2919               gdk_cairo_set_source_rgba (cr, &darker);
2920               add_path_line (cr, xi, y + height, x + width, yi);
2921               cairo_stroke (cr);
2922
2923               ++xi;
2924               ++yi;
2925
2926               add_path_line (cr, xi, y + height, x + width, yi);
2927               cairo_stroke (cr);
2928
2929               xi += 3;
2930               yi += 3;
2931             }
2932         }
2933     }
2934   else if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_PANE_SEPARATOR))
2935     {
2936       if (width > height)
2937         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2938           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2939       else
2940         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2941           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2942     }
2943   else
2944     {
2945       for (yy = y; yy < y + height; yy += 3)
2946         for (xx = x; xx < x + width; xx += 6)
2947           {
2948             render_dot (cr, &lighter, &darker, xx, yy, 2);
2949             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2950           }
2951     }
2952
2953   cairo_restore (cr);
2954 }
2955
2956 void
2957 _gtk_theming_engine_paint_spinner (cairo_t *cr,
2958                                    gdouble  radius,
2959                                    gdouble  progress,
2960                                    GdkRGBA *color)
2961 {
2962   guint num_steps, step;
2963   gdouble half;
2964   gint i;
2965
2966   num_steps = 12;
2967
2968   if (progress >= 0)
2969     step = (guint) (progress * num_steps);
2970   else
2971     step = 0;
2972
2973   cairo_save (cr);
2974
2975   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2976   cairo_set_line_width (cr, 2.0);
2977
2978   half = num_steps / 2;
2979
2980   for (i = 0; i < num_steps; i++)
2981     {
2982       gint inset = 0.7 * radius;
2983
2984       /* transparency is a function of time and intial value */
2985       gdouble t = 1.0 - (gdouble) ((i + step) % num_steps) / num_steps;
2986       gdouble xscale = - sin (i * G_PI / half);
2987       gdouble yscale = - cos (i * G_PI / half);
2988
2989       cairo_set_source_rgba (cr,
2990                              color->red,
2991                              color->green,
2992                              color->blue,
2993                              color->alpha * t);
2994
2995       cairo_move_to (cr,
2996                      (radius - inset) * xscale,
2997                      (radius - inset) * yscale);
2998       cairo_line_to (cr,
2999                      radius * xscale,
3000                      radius * yscale);
3001
3002       cairo_stroke (cr);
3003     }
3004
3005   cairo_restore (cr);
3006 }
3007
3008 static void
3009 render_spinner (GtkThemingEngine *engine,
3010                 cairo_t          *cr,
3011                 gdouble           x,
3012                 gdouble           y,
3013                 gdouble           width,
3014                 gdouble           height)
3015 {
3016   GtkStateFlags state;
3017   GtkShadow *shadow;
3018   GdkRGBA color;
3019   gdouble progress;
3020   gdouble radius;
3021
3022   state = gtk_theming_engine_get_state (engine);
3023
3024   if (!gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
3025     progress = -1;
3026
3027   radius = MIN (width / 2, height / 2);
3028
3029   gtk_theming_engine_get_color (engine, state, &color);
3030   gtk_theming_engine_get (engine, state,
3031                           "icon-shadow", &shadow,
3032                           NULL);
3033
3034   cairo_save (cr);
3035   cairo_translate (cr, x + width / 2, y + height / 2);
3036
3037   if (shadow != NULL)
3038     {
3039       _gtk_icon_shadow_paint_spinner (shadow, cr,
3040                                       radius,
3041                                       progress);
3042       _gtk_shadow_unref (shadow);
3043     }
3044
3045   _gtk_theming_engine_paint_spinner (cr,
3046                                      radius,
3047                                      progress,
3048                                      &color);
3049
3050   cairo_restore (cr);
3051 }
3052
3053 static void
3054 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
3055                                     cairo_t          *cr,
3056                                     gdouble           x,
3057                                     gdouble           y,
3058                                     gdouble           width,
3059                                     gdouble           height)
3060 {
3061   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
3062     {
3063       render_spinner (engine, cr, x, y, width, height);
3064     }
3065   else
3066     {
3067       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
3068       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
3069     }
3070 }
3071
3072 static GdkPixbuf *
3073 scale_or_ref (GdkPixbuf *src,
3074               gint       width,
3075               gint       height)
3076 {
3077   if (width == gdk_pixbuf_get_width (src) &&
3078       height == gdk_pixbuf_get_height (src))
3079     return g_object_ref (src);
3080   else
3081     return gdk_pixbuf_scale_simple (src,
3082                                     width, height,
3083                                     GDK_INTERP_BILINEAR);
3084 }
3085
3086 static gboolean
3087 lookup_icon_size (GtkThemingEngine *engine,
3088                   GtkIconSize       size,
3089                   gint             *width,
3090                   gint             *height)
3091 {
3092   GdkScreen *screen;
3093   GtkSettings *settings;
3094
3095   screen = gtk_theming_engine_get_screen (engine);
3096   settings = gtk_settings_get_for_screen (screen);
3097
3098   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
3099 }
3100
3101 static void
3102 colorshift_source (cairo_t *cr,
3103                    gdouble shift)
3104 {
3105   cairo_pattern_t *source;
3106
3107   cairo_save (cr);
3108   cairo_paint (cr);
3109
3110   source = cairo_pattern_reference (cairo_get_source (cr));
3111
3112   cairo_set_source_rgb (cr, shift, shift, shift);
3113   cairo_set_operator (cr, CAIRO_OPERATOR_COLOR_DODGE);
3114
3115   cairo_mask (cr, source);
3116
3117   cairo_pattern_destroy (source);
3118   cairo_restore (cr);
3119 }
3120
3121 static GdkPixbuf *
3122 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
3123                                        const GtkIconSource *source,
3124                                        GtkIconSize          size)
3125 {
3126   GdkPixbuf *scaled;
3127   GdkPixbuf *stated;
3128   GdkPixbuf *base_pixbuf;
3129   GtkStateFlags state;
3130   gint width = 1;
3131   gint height = 1;
3132   cairo_t *cr;
3133   cairo_surface_t *surface;
3134
3135   base_pixbuf = gtk_icon_source_get_pixbuf (source);
3136   state = gtk_theming_engine_get_state (engine);
3137
3138   g_return_val_if_fail (base_pixbuf != NULL, NULL);
3139
3140   if (size != (GtkIconSize) -1 &&
3141       !lookup_icon_size (engine, size, &width, &height))
3142     {
3143       g_warning (G_STRLOC ": invalid icon size '%d'", size);
3144       return NULL;
3145     }
3146
3147   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
3148    * leave it alone.
3149    */
3150   if (size != (GtkIconSize) -1 &&
3151       gtk_icon_source_get_size_wildcarded (source))
3152     scaled = scale_or_ref (base_pixbuf, width, height);
3153   else
3154     scaled = g_object_ref (base_pixbuf);
3155
3156   /* If the state was wildcarded, then generate a state. */
3157   if (gtk_icon_source_get_state_wildcarded (source))
3158     {
3159       if (state & GTK_STATE_FLAG_INSENSITIVE)
3160         {
3161           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
3162                                                 gdk_pixbuf_get_width (scaled),
3163                                                 gdk_pixbuf_get_height (scaled));
3164           cr = cairo_create (surface);
3165           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
3166           cairo_paint_with_alpha (cr, 0.5);
3167
3168           cairo_destroy (cr);
3169
3170           g_object_unref (scaled);
3171           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
3172                                                 cairo_image_surface_get_width (surface),
3173                                                 cairo_image_surface_get_height (surface));
3174         }
3175       else if (state & GTK_STATE_FLAG_PRELIGHT)
3176         {
3177           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
3178                                                 gdk_pixbuf_get_width (scaled),
3179                                                 gdk_pixbuf_get_height (scaled));
3180
3181           cr = cairo_create (surface);
3182           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
3183           colorshift_source (cr, 0.10);
3184
3185           cairo_destroy (cr);
3186
3187           g_object_unref (scaled);
3188           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
3189                                                 cairo_image_surface_get_width (surface),
3190                                                 cairo_image_surface_get_height (surface));
3191         }
3192       else
3193         stated = scaled;
3194     }
3195   else
3196     stated = scaled;
3197
3198   return stated;
3199 }
3200
3201 static void
3202 gtk_theming_engine_render_icon (GtkThemingEngine *engine,
3203                                 cairo_t *cr,
3204                                 GdkPixbuf *pixbuf,
3205                                 gdouble x,
3206                                 gdouble y)
3207 {
3208   GtkStateFlags state;
3209   GtkShadow *icon_shadow;
3210
3211   state = gtk_theming_engine_get_state (engine);
3212
3213   cairo_save (cr);
3214
3215   gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
3216
3217   gtk_theming_engine_get (engine, state,
3218                           "icon-shadow", &icon_shadow,
3219                           NULL);
3220
3221   if (icon_shadow != NULL)
3222     {
3223       _gtk_icon_shadow_paint (icon_shadow, cr);
3224       _gtk_shadow_unref (icon_shadow);
3225     }
3226
3227   cairo_paint (cr);
3228
3229   cairo_restore (cr);
3230 }
3231