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   GtkStateFlags state;
1727   GtkBorderStyle border_style[4];
1728   GtkRoundedBox border_box;
1729   gdouble progress;
1730   gboolean running;
1731   GtkBorder border;
1732   GdkRGBA *alloc_colors[4];
1733   GdkRGBA colors[4];
1734   guint i;
1735
1736   state = gtk_theming_engine_get_state (engine);
1737
1738   gtk_theming_engine_get_border (engine, state, &border);
1739   gtk_theming_engine_hide_border_sides (&border, hidden_side);
1740
1741   gtk_theming_engine_get (engine, state,
1742                           "border-top-style", &border_style[0],
1743                           "border-right-style", &border_style[1],
1744                           "border-bottom-style", &border_style[2],
1745                           "border-left-style", &border_style[3],
1746                           "border-top-color", &alloc_colors[0],
1747                           "border-right-color", &alloc_colors[1],
1748                           "border-bottom-color", &alloc_colors[2],
1749                           "border-left-color", &alloc_colors[3],
1750                           NULL);
1751
1752   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
1753
1754   if (running)
1755     {
1756       GtkStateFlags other_state;
1757       GdkRGBA *other_colors[4];
1758
1759       if (state & GTK_STATE_FLAG_PRELIGHT)
1760         {
1761           other_state = state & ~(GTK_STATE_FLAG_PRELIGHT);
1762           progress = 1 - progress;
1763         }
1764       else
1765         other_state = state | GTK_STATE_FLAG_PRELIGHT;
1766
1767       gtk_theming_engine_get (engine, other_state,
1768                               "border-top-color", &other_colors[0],
1769                               "border-right-color", &other_colors[1],
1770                               "border-bottom-color", &other_colors[2],
1771                               "border-left-color", &other_colors[3],
1772                               NULL);
1773
1774       for (i = 0; i < 4; i++)
1775         {
1776           colors[i].red = CLAMP (alloc_colors[i]->red + ((other_colors[i]->red - alloc_colors[i]->red) * progress), 0, 1);
1777           colors[i].green = CLAMP (alloc_colors[i]->green + ((other_colors[i]->green - alloc_colors[i]->green) * progress), 0, 1);
1778           colors[i].blue = CLAMP (alloc_colors[i]->blue + ((other_colors[i]->blue - alloc_colors[i]->blue) * progress), 0, 1);
1779           colors[i].alpha = CLAMP (alloc_colors[i]->alpha + ((other_colors[i]->alpha - alloc_colors[i]->alpha) * progress), 0, 1);
1780           gdk_rgba_free (other_colors[i]);
1781           gdk_rgba_free (alloc_colors[i]);
1782         }
1783     }
1784   else
1785     {
1786       for (i = 0; i < 4; i++)
1787         {
1788           colors[i] = *alloc_colors[i];
1789           gdk_rgba_free (alloc_colors[i]);
1790         }
1791     }
1792
1793   _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1794   _gtk_rounded_box_apply_border_radius (&border_box, engine, state, junction);
1795
1796   render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1797
1798   border_style[0] = g_value_get_enum (_gtk_theming_engine_peek_property (engine, "outline-style"));
1799   if (border_style[0] != GTK_BORDER_STYLE_NONE)
1800     {
1801       int offset;
1802
1803       border_style[1] = border_style[2] = border_style[3] = border_style[0];
1804       border.top = g_value_get_int (_gtk_theming_engine_peek_property (engine, "outline-width"));
1805       border.left = border.right = border.bottom = border.top;
1806       colors[0] = *(GdkRGBA *) g_value_get_boxed (_gtk_theming_engine_peek_property (engine, "outline-color"));
1807       colors[3] = colors[2] = colors[1] = colors[0];
1808       offset = g_value_get_int (_gtk_theming_engine_peek_property (engine, "outline-offset"));
1809
1810       /* reinit box here - outlines don't have a border radius */
1811       _gtk_rounded_box_init_rect (&border_box, x, y, width, height);
1812       _gtk_rounded_box_shrink (&border_box,
1813                                - border.top - offset,
1814                                - border.right - offset,
1815                                - border.left - offset,
1816                                - border.bottom - offset);
1817
1818       render_border (cr, &border_box, &border, hidden_side, colors, border_style);
1819     }
1820 }
1821
1822 static void
1823 gtk_theming_engine_render_frame (GtkThemingEngine *engine,
1824                                  cairo_t          *cr,
1825                                  gdouble           x,
1826                                  gdouble           y,
1827                                  gdouble           width,
1828                                  gdouble           height)
1829 {
1830   GtkStateFlags flags;
1831   GtkJunctionSides junction;
1832   GtkBorderImage border_image;
1833   GtkBorder border;
1834
1835   flags = gtk_theming_engine_get_state (engine);
1836   junction = gtk_theming_engine_get_junction_sides (engine);
1837   gtk_theming_engine_get_border (engine, flags, &border);
1838
1839   if (_gtk_border_image_init (&border_image, engine))
1840     _gtk_border_image_render (&border_image, &border,
1841                               cr, x, y, width, height);
1842   else
1843     render_frame_internal (engine, cr,
1844                            x, y, width, height,
1845                            0, junction);
1846 }
1847
1848 static void
1849 gtk_theming_engine_render_expander (GtkThemingEngine *engine,
1850                                     cairo_t          *cr,
1851                                     gdouble           x,
1852                                     gdouble           y,
1853                                     gdouble           width,
1854                                     gdouble           height)
1855 {
1856   GtkStateFlags flags;
1857   GdkRGBA outline_color, fg_color;
1858   double vertical_overshoot;
1859   int diameter;
1860   double radius;
1861   double interp;                /* interpolation factor for center position */
1862   double x_double_horz, y_double_horz;
1863   double x_double_vert, y_double_vert;
1864   double x_double, y_double;
1865   gdouble angle;
1866   gint line_width;
1867   gboolean running, is_rtl;
1868   gdouble progress;
1869
1870   cairo_save (cr);
1871   flags = gtk_theming_engine_get_state (engine);
1872
1873   gtk_theming_engine_get_color (engine, flags, &fg_color);
1874   gtk_theming_engine_get_border_color (engine, flags, &outline_color);
1875
1876   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress);
1877   is_rtl = (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL);
1878   line_width = 1;
1879
1880   if (!running)
1881     progress = (flags & GTK_STATE_FLAG_ACTIVE) ? 1 : 0;
1882
1883   if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_HORIZONTAL))
1884     {
1885       if (is_rtl)
1886         angle = (G_PI) - ((G_PI / 2) * progress);
1887       else
1888         angle = (G_PI / 2) * progress;
1889     }
1890   else
1891     {
1892       if (is_rtl)
1893         angle = (G_PI / 2) + ((G_PI / 2) * progress);
1894       else
1895         angle = (G_PI / 2) - ((G_PI / 2) * progress);
1896     }
1897
1898   interp = progress;
1899
1900   /* Compute distance that the stroke extends beyonds the end
1901    * of the triangle we draw.
1902    */
1903   vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
1904
1905   /* For odd line widths, we end the vertical line of the triangle
1906    * at a half pixel, so we round differently.
1907    */
1908   if (line_width % 2 == 1)
1909     vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
1910   else
1911     vertical_overshoot = ceil (vertical_overshoot);
1912
1913   /* Adjust the size of the triangle we draw so that the entire stroke fits
1914    */
1915   diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
1916
1917   /* If the line width is odd, we want the diameter to be even,
1918    * and vice versa, so force the sum to be odd. This relationship
1919    * makes the point of the triangle look right.
1920    */
1921   diameter -= (1 - (diameter + line_width) % 2);
1922
1923   radius = diameter / 2.;
1924
1925   /* Adjust the center so that the stroke is properly aligned with
1926    * the pixel grid. The center adjustment is different for the
1927    * horizontal and vertical orientations. For intermediate positions
1928    * we interpolate between the two.
1929    */
1930   x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1931   y_double_vert = (y + height / 2) - 0.5;
1932
1933   x_double_horz = (x + width / 2) - 0.5;
1934   y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
1935
1936   x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
1937   y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
1938
1939   cairo_translate (cr, x_double, y_double);
1940   cairo_rotate (cr, angle);
1941
1942   cairo_move_to (cr, - radius / 2., - radius);
1943   cairo_line_to (cr,   radius / 2.,   0);
1944   cairo_line_to (cr, - radius / 2.,   radius);
1945   cairo_close_path (cr);
1946
1947   cairo_set_line_width (cr, line_width);
1948
1949   gdk_cairo_set_source_rgba (cr, &fg_color);
1950
1951   cairo_fill_preserve (cr);
1952
1953   gdk_cairo_set_source_rgba (cr, &outline_color);
1954   cairo_stroke (cr);
1955
1956   cairo_restore (cr);
1957 }
1958
1959 static void
1960 gtk_theming_engine_render_focus (GtkThemingEngine *engine,
1961                                  cairo_t          *cr,
1962                                  gdouble           x,
1963                                  gdouble           y,
1964                                  gdouble           width,
1965                                  gdouble           height)
1966 {
1967   GtkStateFlags flags;
1968   GdkRGBA color;
1969   gint line_width;
1970   gint8 *dash_list;
1971
1972   cairo_save (cr);
1973   flags = gtk_theming_engine_get_state (engine);
1974
1975   gtk_theming_engine_get_color (engine, flags, &color);
1976
1977   gtk_theming_engine_get_style (engine,
1978                                 "focus-line-width", &line_width,
1979                                 "focus-line-pattern", (gchar *) &dash_list,
1980                                 NULL);
1981
1982   cairo_set_line_width (cr, (gdouble) line_width);
1983
1984   if (dash_list[0])
1985     {
1986       gint n_dashes = strlen ((const gchar *) dash_list);
1987       gdouble *dashes = g_new (gdouble, n_dashes);
1988       gdouble total_length = 0;
1989       gdouble dash_offset;
1990       gint i;
1991
1992       for (i = 0; i < n_dashes; i++)
1993         {
1994           dashes[i] = dash_list[i];
1995           total_length += dash_list[i];
1996         }
1997
1998       /* The dash offset here aligns the pattern to integer pixels
1999        * by starting the dash at the right side of the left border
2000        * Negative dash offsets in cairo don't work
2001        * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
2002        */
2003       dash_offset = - line_width / 2.;
2004
2005       while (dash_offset < 0)
2006         dash_offset += total_length;
2007
2008       cairo_set_dash (cr, dashes, n_dashes, dash_offset);
2009       g_free (dashes);
2010     }
2011
2012   cairo_rectangle (cr,
2013                    x + line_width / 2.,
2014                    y + line_width / 2.,
2015                    width - line_width,
2016                    height - line_width);
2017
2018   gdk_cairo_set_source_rgba (cr, &color);
2019   cairo_stroke (cr);
2020
2021   cairo_restore (cr);
2022
2023   g_free (dash_list);
2024 }
2025
2026 static void
2027 gtk_theming_engine_render_line (GtkThemingEngine *engine,
2028                                 cairo_t          *cr,
2029                                 gdouble           x0,
2030                                 gdouble           y0,
2031                                 gdouble           x1,
2032                                 gdouble           y1)
2033 {
2034   GdkRGBA color;
2035   GtkStateFlags flags;
2036
2037   flags = gtk_theming_engine_get_state (engine);
2038   cairo_save (cr);
2039
2040   gtk_theming_engine_get_color (engine, flags, &color);
2041
2042   cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
2043   cairo_set_line_width (cr, 1);
2044
2045   cairo_move_to (cr, x0 + 0.5, y0 + 0.5);
2046   cairo_line_to (cr, x1 + 0.5, y1 + 0.5);
2047
2048   gdk_cairo_set_source_rgba (cr, &color);
2049   cairo_stroke (cr);
2050
2051   cairo_restore (cr);
2052 }
2053
2054 static void
2055 prepare_context_for_layout (cairo_t *cr,
2056                             gdouble x,
2057                             gdouble y,
2058                             PangoLayout *layout)
2059 {
2060   const PangoMatrix *matrix;
2061
2062   matrix = pango_context_get_matrix (pango_layout_get_context (layout));
2063
2064   cairo_move_to (cr, x, y);
2065
2066   if (matrix)
2067     {
2068       cairo_matrix_t cairo_matrix;
2069
2070       cairo_matrix_init (&cairo_matrix,
2071                          matrix->xx, matrix->yx,
2072                          matrix->xy, matrix->yy,
2073                          matrix->x0, matrix->y0);
2074
2075       cairo_transform (cr, &cairo_matrix);
2076     }
2077 }
2078
2079 static void
2080 gtk_theming_engine_render_layout (GtkThemingEngine *engine,
2081                                   cairo_t          *cr,
2082                                   gdouble           x,
2083                                   gdouble           y,
2084                                   PangoLayout      *layout)
2085 {
2086   GdkRGBA fg_color;
2087   GtkShadow *text_shadow = NULL;
2088   GtkStateFlags flags;
2089   gdouble progress;
2090   gboolean running;
2091
2092   cairo_save (cr);
2093   flags = gtk_theming_engine_get_state (engine);
2094   gtk_theming_engine_get_color (engine, flags, &fg_color);
2095
2096   running = gtk_theming_engine_state_is_running (engine, GTK_STATE_PRELIGHT, &progress);
2097
2098   if (running)
2099     {
2100       GtkStateFlags other_flags;
2101       GdkRGBA other_fg;
2102
2103       if (flags & GTK_STATE_FLAG_PRELIGHT)
2104         {
2105           other_flags = flags & ~(GTK_STATE_FLAG_PRELIGHT);
2106           progress = 1 - progress;
2107         }
2108       else
2109         other_flags = flags | GTK_STATE_FLAG_PRELIGHT;
2110
2111       gtk_theming_engine_get_color (engine, other_flags, &other_fg);
2112
2113       fg_color.red = CLAMP (fg_color.red + ((other_fg.red - fg_color.red) * progress), 0, 1);
2114       fg_color.green = CLAMP (fg_color.green + ((other_fg.green - fg_color.green) * progress), 0, 1);
2115       fg_color.blue = CLAMP (fg_color.blue + ((other_fg.blue - fg_color.blue) * progress), 0, 1);
2116       fg_color.alpha = CLAMP (fg_color.alpha + ((other_fg.alpha - fg_color.alpha) * progress), 0, 1);
2117     }
2118
2119   gtk_theming_engine_get (engine, flags,
2120                           "text-shadow", &text_shadow,
2121                           NULL);
2122
2123   prepare_context_for_layout (cr, x, y, layout);
2124
2125   if (text_shadow != NULL)
2126     {
2127       _gtk_text_shadow_paint_layout (text_shadow, cr, layout);
2128       _gtk_shadow_unref (text_shadow);
2129     }
2130
2131   gdk_cairo_set_source_rgba (cr, &fg_color);
2132   pango_cairo_show_layout (cr, layout);
2133
2134   cairo_restore (cr);
2135 }
2136
2137 static void
2138 gtk_theming_engine_render_slider (GtkThemingEngine *engine,
2139                                   cairo_t          *cr,
2140                                   gdouble           x,
2141                                   gdouble           y,
2142                                   gdouble           width,
2143                                   gdouble           height,
2144                                   GtkOrientation    orientation)
2145 {
2146   const GtkWidgetPath *path;
2147   gint thickness;
2148
2149   path = gtk_theming_engine_get_path (engine);
2150
2151   gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2152   gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2153
2154   /* FIXME: thickness */
2155   thickness = 2;
2156
2157   if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
2158     {
2159       if (orientation == GTK_ORIENTATION_VERTICAL)
2160         gtk_theming_engine_render_line (engine, cr,
2161                                         x + thickness,
2162                                         y + (gint) height / 2,
2163                                         x + width - thickness - 1,
2164                                         y + (gint) height / 2);
2165       else
2166         gtk_theming_engine_render_line (engine, cr,
2167                                         x + (gint) width / 2,
2168                                         y + thickness,
2169                                         x + (gint) width / 2,
2170                                         y + height - thickness - 1);
2171     }
2172 }
2173
2174 static void
2175 gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
2176                                      cairo_t          *cr,
2177                                      gdouble           x,
2178                                      gdouble           y,
2179                                      gdouble           width,
2180                                      gdouble           height,
2181                                      GtkPositionType   gap_side,
2182                                      gdouble           xy0_gap,
2183                                      gdouble           xy1_gap)
2184 {
2185   GtkJunctionSides junction;
2186   GtkStateFlags state;
2187   gint border_width;
2188   GtkCssBorderCornerRadius *top_left_radius, *top_right_radius;
2189   GtkCssBorderCornerRadius *bottom_left_radius, *bottom_right_radius;
2190   gdouble x0, y0, x1, y1, xc, yc, wc, hc;
2191   GtkBorderImage border_image;
2192   GtkBorder border;
2193
2194   xc = yc = wc = hc = 0;
2195   state = gtk_theming_engine_get_state (engine);
2196   junction = gtk_theming_engine_get_junction_sides (engine);
2197
2198   gtk_theming_engine_get_border (engine, state, &border);
2199   gtk_theming_engine_get (engine, state,
2200                           "border-top-left-radius", &top_left_radius,
2201                           "border-top-right-radius", &top_right_radius,
2202                           "border-bottom-right-radius", &bottom_right_radius,
2203                           "border-bottom-left-radius", &bottom_left_radius,
2204                           NULL);
2205
2206   border_width = MIN (MIN (border.top, border.bottom),
2207                       MIN (border.left, border.right));
2208
2209   cairo_save (cr);
2210
2211   switch (gap_side)
2212     {
2213     case GTK_POS_TOP:
2214       xc = x + xy0_gap + border_width;
2215       yc = y;
2216       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2217       hc = border_width;
2218
2219       if (xy0_gap < top_left_radius->horizontal)
2220         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2221
2222       if (xy1_gap > width - top_right_radius->horizontal)
2223         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2224       break;
2225     case GTK_POS_BOTTOM:
2226       xc = x + xy0_gap + border_width;
2227       yc = y + height - border_width;
2228       wc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2229       hc = border_width;
2230
2231       if (xy0_gap < bottom_left_radius->horizontal)
2232         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2233
2234       if (xy1_gap > width - bottom_right_radius->horizontal)
2235         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2236
2237       break;
2238     case GTK_POS_LEFT:
2239       xc = x;
2240       yc = y + xy0_gap + border_width;
2241       wc = border_width;
2242       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2243
2244       if (xy0_gap < top_left_radius->vertical)
2245         junction |= GTK_JUNCTION_CORNER_TOPLEFT;
2246
2247       if (xy1_gap > height - bottom_left_radius->vertical)
2248         junction |= GTK_JUNCTION_CORNER_BOTTOMLEFT;
2249
2250       break;
2251     case GTK_POS_RIGHT:
2252       xc = x + width - border_width;
2253       yc = y + xy0_gap + border_width;
2254       wc = border_width;
2255       hc = MAX (xy1_gap - xy0_gap - 2 * border_width, 0);
2256
2257       if (xy0_gap < top_right_radius->vertical)
2258         junction |= GTK_JUNCTION_CORNER_TOPRIGHT;
2259
2260       if (xy1_gap > height - bottom_right_radius->vertical)
2261         junction |= GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2262
2263       break;
2264     }
2265
2266   cairo_clip_extents (cr, &x0, &y0, &x1, &y1);
2267   cairo_rectangle (cr, x0, y0, x1 - x0, yc - y0);
2268   cairo_rectangle (cr, x0, yc, xc - x0, hc);
2269   cairo_rectangle (cr, xc + wc, yc, x1 - (xc + wc), hc);
2270   cairo_rectangle (cr, x0, yc + hc, x1 - x0, y1 - (yc + hc));
2271   cairo_clip (cr);
2272
2273   if (_gtk_border_image_init (&border_image, engine))
2274     _gtk_border_image_render (&border_image, &border,
2275                               cr, x, y, width, height);
2276   else
2277     render_frame_internal (engine, cr,
2278                            x, y, width, height,
2279                            0, junction);
2280
2281   cairo_restore (cr);
2282
2283   g_free (top_left_radius);
2284   g_free (top_right_radius);
2285   g_free (bottom_right_radius);
2286   g_free (bottom_left_radius);
2287 }
2288
2289 static void
2290 gtk_theming_engine_render_extension (GtkThemingEngine *engine,
2291                                      cairo_t          *cr,
2292                                      gdouble           x,
2293                                      gdouble           y,
2294                                      gdouble           width,
2295                                      gdouble           height,
2296                                      GtkPositionType   gap_side)
2297 {
2298   GtkThemingBackground bg;
2299   GtkJunctionSides junction = 0;
2300   guint hidden_side = 0;
2301
2302   cairo_save (cr);
2303
2304   switch (gap_side)
2305     {
2306     case GTK_POS_LEFT:
2307       junction = GTK_JUNCTION_LEFT;
2308       hidden_side = (1 << GTK_CSS_LEFT);
2309
2310       cairo_translate (cr, x + width, y);
2311       cairo_rotate (cr, G_PI / 2);
2312       break;
2313     case GTK_POS_RIGHT:
2314       junction = GTK_JUNCTION_RIGHT;
2315       hidden_side = (1 << GTK_CSS_RIGHT);
2316
2317       cairo_translate (cr, x, y + height);
2318       cairo_rotate (cr, - G_PI / 2);
2319       break;
2320     case GTK_POS_TOP:
2321       junction = GTK_JUNCTION_TOP;
2322       hidden_side = (1 << GTK_CSS_TOP);
2323
2324       cairo_translate (cr, x + width, y + height);
2325       cairo_rotate (cr, G_PI);
2326       break;
2327     case GTK_POS_BOTTOM:
2328       junction = GTK_JUNCTION_BOTTOM;
2329       hidden_side = (1 << GTK_CSS_BOTTOM);
2330
2331       cairo_translate (cr, x, y);
2332       break;
2333     }
2334
2335   if (gap_side == GTK_POS_TOP ||
2336       gap_side == GTK_POS_BOTTOM)
2337     _gtk_theming_background_init (&bg, engine,
2338                                   0, 0,
2339                                   width, height,
2340                                   GTK_JUNCTION_BOTTOM);
2341   else
2342     _gtk_theming_background_init (&bg, engine,
2343                                   0, 0,
2344                                   height, width,
2345                                   GTK_JUNCTION_BOTTOM);
2346
2347   _gtk_theming_background_render (&bg, cr);
2348
2349   cairo_restore (cr);
2350
2351   cairo_save (cr);
2352
2353   render_frame_internal (engine, cr,
2354                          x, y, width, height,
2355                          hidden_side, junction);
2356
2357   cairo_restore (cr);
2358 }
2359
2360 static void
2361 render_dot (cairo_t       *cr,
2362             const GdkRGBA *lighter,
2363             const GdkRGBA *darker,
2364             gdouble        x,
2365             gdouble        y,
2366             gdouble        size)
2367 {
2368   size = CLAMP ((gint) size, 2, 3);
2369
2370   if (size == 2)
2371     {
2372       gdk_cairo_set_source_rgba (cr, lighter);
2373       cairo_rectangle (cr, x, y, 1, 1);
2374       cairo_rectangle (cr, x + 1, y + 1, 1, 1);
2375       cairo_fill (cr);
2376     }
2377   else if (size == 3)
2378     {
2379       gdk_cairo_set_source_rgba (cr, lighter);
2380       cairo_rectangle (cr, x, y, 2, 1);
2381       cairo_rectangle (cr, x, y, 1, 2);
2382       cairo_fill (cr);
2383
2384       gdk_cairo_set_source_rgba (cr, darker);
2385       cairo_rectangle (cr, x + 1, y + 1, 2, 1);
2386       cairo_rectangle (cr, x + 2, y, 1, 2);
2387       cairo_fill (cr);
2388     }
2389 }
2390
2391 static void
2392 gtk_theming_engine_render_handle (GtkThemingEngine *engine,
2393                                   cairo_t          *cr,
2394                                   gdouble           x,
2395                                   gdouble           y,
2396                                   gdouble           width,
2397                                   gdouble           height)
2398 {
2399   GtkStateFlags flags;
2400   GdkRGBA bg_color, lighter, darker;
2401   GtkJunctionSides sides;
2402   GtkThemingBackground bg;
2403   gint xx, yy;
2404
2405   cairo_save (cr);
2406   flags = gtk_theming_engine_get_state (engine);
2407
2408   cairo_set_line_width (cr, 1.0);
2409   sides = gtk_theming_engine_get_junction_sides (engine);
2410   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
2411
2412   color_shade (&bg_color, 0.7, &darker);
2413   color_shade (&bg_color, 1.3, &lighter);
2414
2415   _gtk_theming_background_init (&bg, engine, x, y, width, height, sides);
2416   _gtk_theming_background_render (&bg, cr);
2417
2418   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_GRIP))
2419     {
2420       /* reduce confusing values to a meaningful state */
2421       if ((sides & (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)) == (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT))
2422         sides &= ~GTK_JUNCTION_CORNER_TOPLEFT;
2423
2424       if ((sides & (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT)) == (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMLEFT))
2425         sides &= ~GTK_JUNCTION_CORNER_TOPRIGHT;
2426
2427       if (sides == 0)
2428         sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
2429
2430       /* align drawing area to the connected side */
2431       if (sides == GTK_JUNCTION_LEFT)
2432         {
2433           if (height < width)
2434             width = height;
2435         }
2436       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2437         {
2438           if (width < height)
2439             height = width;
2440           else if (height < width)
2441             width = height;
2442         }
2443       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2444         {
2445           /* make it square, aligning to bottom left */
2446           if (width < height)
2447             {
2448               y += (height - width);
2449               height = width;
2450             }
2451           else if (height < width)
2452             width = height;
2453         }
2454       else if (sides == GTK_JUNCTION_RIGHT)
2455         {
2456           /* aligning to right */
2457           if (height < width)
2458             {
2459               x += (width - height);
2460               width = height;
2461             }
2462         }
2463       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2464         {
2465           if (width < height)
2466             height = width;
2467           else if (height < width)
2468             {
2469               x += (width - height);
2470               width = height;
2471             }
2472         }
2473       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2474         {
2475           /* make it square, aligning to bottom right */
2476           if (width < height)
2477             {
2478               y += (height - width);
2479               height = width;
2480             }
2481           else if (height < width)
2482             {
2483               x += (width - height);
2484               width = height;
2485             }
2486         }
2487       else if (sides == GTK_JUNCTION_TOP)
2488         {
2489           if (width < height)
2490             height = width;
2491         }
2492       else if (sides == GTK_JUNCTION_BOTTOM)
2493         {
2494           /* align to bottom */
2495           if (width < height)
2496             {
2497               y += (height - width);
2498               height = width;
2499             }
2500         }
2501       else
2502         g_assert_not_reached ();
2503
2504       if (sides == GTK_JUNCTION_LEFT ||
2505           sides == GTK_JUNCTION_RIGHT)
2506         {
2507           gint xi;
2508
2509           xi = x;
2510
2511           while (xi < x + width)
2512             {
2513               gdk_cairo_set_source_rgba (cr, &lighter);
2514               add_path_line (cr, x, y, x, y + height);
2515               cairo_stroke (cr);
2516               xi++;
2517
2518               gdk_cairo_set_source_rgba (cr, &darker);
2519               add_path_line (cr, xi, y, xi, y + height);
2520               cairo_stroke (cr);
2521               xi += 2;
2522             }
2523         }
2524       else if (sides == GTK_JUNCTION_TOP ||
2525                sides == GTK_JUNCTION_BOTTOM)
2526         {
2527           gint yi;
2528
2529           yi = y;
2530
2531           while (yi < y + height)
2532             {
2533               gdk_cairo_set_source_rgba (cr, &lighter);
2534               add_path_line (cr, x, yi, x + width, yi);
2535               cairo_stroke (cr);
2536               yi++;
2537
2538               gdk_cairo_set_source_rgba (cr, &darker);
2539               add_path_line (cr, x, yi, x + width, yi);
2540               cairo_stroke (cr);
2541               yi += 2;
2542             }
2543         }
2544       else if (sides == GTK_JUNCTION_CORNER_TOPLEFT)
2545         {
2546           gint xi, yi;
2547
2548           xi = x + width;
2549           yi = y + height;
2550
2551           while (xi > x + 3)
2552             {
2553               gdk_cairo_set_source_rgba (cr, &darker);
2554               add_path_line (cr, xi, y, x, yi);
2555               cairo_stroke (cr);
2556
2557               --xi;
2558               --yi;
2559
2560               add_path_line (cr, xi, y, x, yi);
2561               cairo_stroke (cr);
2562
2563               --xi;
2564               --yi;
2565
2566               gdk_cairo_set_source_rgba (cr, &lighter);
2567               add_path_line (cr, xi, y, x, yi);
2568               cairo_stroke (cr);
2569
2570               xi -= 3;
2571               yi -= 3;
2572             }
2573         }
2574       else if (sides == GTK_JUNCTION_CORNER_TOPRIGHT)
2575         {
2576           gint xi, yi;
2577
2578           xi = x;
2579           yi = y + height;
2580
2581           while (xi < (x + width - 3))
2582             {
2583               gdk_cairo_set_source_rgba (cr, &lighter);
2584               add_path_line (cr, xi, y, x + width, yi);
2585               cairo_stroke (cr);
2586
2587               ++xi;
2588               --yi;
2589
2590               gdk_cairo_set_source_rgba (cr, &darker);
2591               add_path_line (cr, xi, y, x + width, yi);
2592               cairo_stroke (cr);
2593
2594               ++xi;
2595               --yi;
2596
2597               add_path_line (cr, xi, y, x + width, yi);
2598               cairo_stroke (cr);
2599
2600               xi += 3;
2601               yi -= 3;
2602             }
2603         }
2604       else if (sides == GTK_JUNCTION_CORNER_BOTTOMLEFT)
2605         {
2606           gint xi, yi;
2607
2608           xi = x + width;
2609           yi = y;
2610
2611           while (xi > x + 3)
2612             {
2613               gdk_cairo_set_source_rgba (cr, &darker);
2614               add_path_line (cr, x, yi, xi, y + height);
2615               cairo_stroke (cr);
2616
2617               --xi;
2618               ++yi;
2619
2620               add_path_line (cr, x, yi, xi, y + height);
2621               cairo_stroke (cr);
2622
2623               --xi;
2624               ++yi;
2625
2626               gdk_cairo_set_source_rgba (cr, &lighter);
2627               add_path_line (cr, x, yi, xi, y + height);
2628               cairo_stroke (cr);
2629
2630               xi -= 3;
2631               yi += 3;
2632             }
2633         }
2634       else if (sides == GTK_JUNCTION_CORNER_BOTTOMRIGHT)
2635         {
2636           gint xi, yi;
2637
2638           xi = x;
2639           yi = y;
2640
2641           while (xi < (x + width - 3))
2642             {
2643               gdk_cairo_set_source_rgba (cr, &lighter);
2644               add_path_line (cr, xi, y + height, x + width, yi);
2645               cairo_stroke (cr);
2646
2647               ++xi;
2648               ++yi;
2649
2650               gdk_cairo_set_source_rgba (cr, &darker);
2651               add_path_line (cr, xi, y + height, x + width, yi);
2652               cairo_stroke (cr);
2653
2654               ++xi;
2655               ++yi;
2656
2657               add_path_line (cr, xi, y + height, x + width, yi);
2658               cairo_stroke (cr);
2659
2660               xi += 3;
2661               yi += 3;
2662             }
2663         }
2664     }
2665   else if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_PANE_SEPARATOR))
2666     {
2667       if (width > height)
2668         for (xx = x + width / 2 - 15; xx <= x + width / 2 + 15; xx += 5)
2669           render_dot (cr, &lighter, &darker, xx, y + height / 2 - 1, 3);
2670       else
2671         for (yy = y + height / 2 - 15; yy <= y + height / 2 + 15; yy += 5)
2672           render_dot (cr, &lighter, &darker, x + width / 2 - 1, yy, 3);
2673     }
2674   else
2675     {
2676       for (yy = y; yy < y + height; yy += 3)
2677         for (xx = x; xx < x + width; xx += 6)
2678           {
2679             render_dot (cr, &lighter, &darker, xx, yy, 2);
2680             render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
2681           }
2682     }
2683
2684   cairo_restore (cr);
2685 }
2686
2687 void
2688 _gtk_theming_engine_paint_spinner (cairo_t *cr,
2689                                    gdouble  radius,
2690                                    gdouble  progress,
2691                                    GdkRGBA *color)
2692 {
2693   guint num_steps, step;
2694   gdouble half;
2695   gint i;
2696
2697   num_steps = 12;
2698
2699   if (progress >= 0)
2700     step = (guint) (progress * num_steps);
2701   else
2702     step = 0;
2703
2704   cairo_save (cr);
2705
2706   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
2707   cairo_set_line_width (cr, 2.0);
2708
2709   half = num_steps / 2;
2710
2711   for (i = 0; i < num_steps; i++)
2712     {
2713       gint inset = 0.7 * radius;
2714
2715       /* transparency is a function of time and intial value */
2716       gdouble t = 1.0 - (gdouble) ((i + step) % num_steps) / num_steps;
2717       gdouble xscale = - sin (i * G_PI / half);
2718       gdouble yscale = - cos (i * G_PI / half);
2719
2720       cairo_set_source_rgba (cr,
2721                              color->red,
2722                              color->green,
2723                              color->blue,
2724                              color->alpha * t);
2725
2726       cairo_move_to (cr,
2727                      (radius - inset) * xscale,
2728                      (radius - inset) * yscale);
2729       cairo_line_to (cr,
2730                      radius * xscale,
2731                      radius * yscale);
2732
2733       cairo_stroke (cr);
2734     }
2735
2736   cairo_restore (cr);
2737 }
2738
2739 static void
2740 render_spinner (GtkThemingEngine *engine,
2741                 cairo_t          *cr,
2742                 gdouble           x,
2743                 gdouble           y,
2744                 gdouble           width,
2745                 gdouble           height)
2746 {
2747   GtkStateFlags state;
2748   GtkShadow *shadow;
2749   GdkRGBA color;
2750   gdouble progress;
2751   gdouble radius;
2752
2753   state = gtk_theming_engine_get_state (engine);
2754
2755   if (!gtk_theming_engine_state_is_running (engine, GTK_STATE_ACTIVE, &progress))
2756     progress = -1;
2757
2758   radius = MIN (width / 2, height / 2);
2759
2760   gtk_theming_engine_get_color (engine, state, &color);
2761   gtk_theming_engine_get (engine, state,
2762                           "icon-shadow", &shadow,
2763                           NULL);
2764
2765   cairo_save (cr);
2766   cairo_translate (cr, x + width / 2, y + height / 2);
2767
2768   if (shadow != NULL)
2769     {
2770       _gtk_icon_shadow_paint_spinner (shadow, cr,
2771                                       radius,
2772                                       progress);
2773       _gtk_shadow_unref (shadow);
2774     }
2775
2776   _gtk_theming_engine_paint_spinner (cr,
2777                                      radius,
2778                                      progress,
2779                                      &color);
2780
2781   cairo_restore (cr);
2782 }
2783
2784 static void
2785 gtk_theming_engine_render_activity (GtkThemingEngine *engine,
2786                                     cairo_t          *cr,
2787                                     gdouble           x,
2788                                     gdouble           y,
2789                                     gdouble           width,
2790                                     gdouble           height)
2791 {
2792   if (gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_SPINNER))
2793     {
2794       render_spinner (engine, cr, x, y, width, height);
2795     }
2796   else
2797     {
2798       gtk_theming_engine_render_background (engine, cr, x, y, width, height);
2799       gtk_theming_engine_render_frame (engine, cr, x, y, width, height);
2800     }
2801 }
2802
2803 static GdkPixbuf *
2804 scale_or_ref (GdkPixbuf *src,
2805               gint       width,
2806               gint       height)
2807 {
2808   if (width == gdk_pixbuf_get_width (src) &&
2809       height == gdk_pixbuf_get_height (src))
2810     return g_object_ref (src);
2811   else
2812     return gdk_pixbuf_scale_simple (src,
2813                                     width, height,
2814                                     GDK_INTERP_BILINEAR);
2815 }
2816
2817 static gboolean
2818 lookup_icon_size (GtkThemingEngine *engine,
2819                   GtkIconSize       size,
2820                   gint             *width,
2821                   gint             *height)
2822 {
2823   GdkScreen *screen;
2824   GtkSettings *settings;
2825
2826   screen = gtk_theming_engine_get_screen (engine);
2827   settings = gtk_settings_get_for_screen (screen);
2828
2829   return gtk_icon_size_lookup_for_settings (settings, size, width, height);
2830 }
2831
2832 static void
2833 colorshift_source (cairo_t *cr,
2834                    gdouble shift)
2835 {
2836   cairo_pattern_t *source;
2837
2838   cairo_save (cr);
2839   cairo_paint (cr);
2840
2841   source = cairo_pattern_reference (cairo_get_source (cr));
2842
2843   cairo_set_source_rgb (cr, shift, shift, shift);
2844   cairo_set_operator (cr, CAIRO_OPERATOR_COLOR_DODGE);
2845
2846   cairo_mask (cr, source);
2847
2848   cairo_pattern_destroy (source);
2849   cairo_restore (cr);
2850 }
2851
2852 static GdkPixbuf *
2853 gtk_theming_engine_render_icon_pixbuf (GtkThemingEngine    *engine,
2854                                        const GtkIconSource *source,
2855                                        GtkIconSize          size)
2856 {
2857   GdkPixbuf *scaled;
2858   GdkPixbuf *stated;
2859   GdkPixbuf *base_pixbuf;
2860   GtkStateFlags state;
2861   gint width = 1;
2862   gint height = 1;
2863   cairo_t *cr;
2864   cairo_surface_t *surface;
2865
2866   base_pixbuf = gtk_icon_source_get_pixbuf (source);
2867   state = gtk_theming_engine_get_state (engine);
2868
2869   g_return_val_if_fail (base_pixbuf != NULL, NULL);
2870
2871   if (size != (GtkIconSize) -1 &&
2872       !lookup_icon_size (engine, size, &width, &height))
2873     {
2874       g_warning (G_STRLOC ": invalid icon size '%d'", size);
2875       return NULL;
2876     }
2877
2878   /* If the size was wildcarded, and we're allowed to scale, then scale; otherwise,
2879    * leave it alone.
2880    */
2881   if (size != (GtkIconSize) -1 &&
2882       gtk_icon_source_get_size_wildcarded (source))
2883     scaled = scale_or_ref (base_pixbuf, width, height);
2884   else
2885     scaled = g_object_ref (base_pixbuf);
2886
2887   /* If the state was wildcarded, then generate a state. */
2888   if (gtk_icon_source_get_state_wildcarded (source))
2889     {
2890       if (state & GTK_STATE_FLAG_INSENSITIVE)
2891         {
2892           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2893                                                 gdk_pixbuf_get_width (scaled),
2894                                                 gdk_pixbuf_get_height (scaled));
2895           cr = cairo_create (surface);
2896           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2897           cairo_paint_with_alpha (cr, 0.5);
2898
2899           cairo_destroy (cr);
2900
2901           g_object_unref (scaled);
2902           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2903                                                 cairo_image_surface_get_width (surface),
2904                                                 cairo_image_surface_get_height (surface));
2905           cairo_surface_destroy (surface);
2906         }
2907       else if (state & GTK_STATE_FLAG_PRELIGHT)
2908         {
2909           surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
2910                                                 gdk_pixbuf_get_width (scaled),
2911                                                 gdk_pixbuf_get_height (scaled));
2912
2913           cr = cairo_create (surface);
2914           gdk_cairo_set_source_pixbuf (cr, scaled, 0, 0);
2915           colorshift_source (cr, 0.10);
2916
2917           cairo_destroy (cr);
2918
2919           g_object_unref (scaled);
2920           stated = gdk_pixbuf_get_from_surface (surface, 0, 0,
2921                                                 cairo_image_surface_get_width (surface),
2922                                                 cairo_image_surface_get_height (surface));
2923           cairo_surface_destroy (surface);
2924         }
2925       else
2926         stated = scaled;
2927     }
2928   else
2929     stated = scaled;
2930
2931   return stated;
2932 }
2933
2934 static void
2935 gtk_theming_engine_render_icon (GtkThemingEngine *engine,
2936                                 cairo_t *cr,
2937                                 GdkPixbuf *pixbuf,
2938                                 gdouble x,
2939                                 gdouble y)
2940 {
2941   GtkStateFlags state;
2942   GtkShadow *icon_shadow;
2943
2944   state = gtk_theming_engine_get_state (engine);
2945
2946   cairo_save (cr);
2947
2948   gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
2949
2950   gtk_theming_engine_get (engine, state,
2951                           "icon-shadow", &icon_shadow,
2952                           NULL);
2953
2954   if (icon_shadow != NULL)
2955     {
2956       _gtk_icon_shadow_paint (icon_shadow, cr);
2957       _gtk_shadow_unref (icon_shadow);
2958     }
2959
2960   cairo_paint (cr);
2961
2962   cairo_restore (cr);
2963 }
2964