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

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