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

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2011 Red Hat, Inc.
   3  *
   4  * Author: Cosimo Cecchi <cosimoc@gnome.org>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "config.h"
  21
  22 #include "gtkcssshadowvalueprivate.h"
  23
  24 #include "gtkcairoblurprivate.h"
  25 #include "gtkcsscolorvalueprivate.h"
  26 #include "gtkcssnumbervalueprivate.h"
  27 #include "gtkcssrgbavalueprivate.h"
  28 #include "gtkstylecontextprivate.h"
  29 #include "gtkthemingengineprivate.h"
  30 #include "gtkpango.h"
  31
  32 struct _GtkCssValue {
  33   GTK_CSS_VALUE_BASE
  34   guint inset :1;
  35
  36   GtkCssValue *hoffset;
  37   GtkCssValue *voffset;
  38   GtkCssValue *radius;
  39   GtkCssValue *spread;
  40
  41   GtkCssValue *color;
  42 };
  43
  44 static GtkCssValue *    gtk_css_shadow_value_new (GtkCssValue *hoffset,
  45                                                   GtkCssValue *voffset,
  46                                                   GtkCssValue *radius,
  47                                                   GtkCssValue *spread,
  48                                                   gboolean     inset,
  49                                                   GtkCssValue *color);
  50
  51 static void
  52 gtk_css_value_shadow_free (GtkCssValue *shadow)
  53 {
  54   _gtk_css_value_unref (shadow->hoffset);
  55   _gtk_css_value_unref (shadow->voffset);
  56   _gtk_css_value_unref (shadow->radius);
  57   _gtk_css_value_unref (shadow->spread);
  58   _gtk_css_value_unref (shadow->color);
  59
  60   g_slice_free (GtkCssValue, shadow);
  61 }
  62
  63 static GtkCssValue *
  64 gtk_css_value_shadow_compute (GtkCssValue             *shadow,
  65                               guint                    property_id,
  66                               GtkStyleProviderPrivate *provider,
  67                               GtkCssComputedValues    *values,
  68                               GtkCssComputedValues    *parent_values,
  69                               GtkCssDependencies      *dependencies)
  70 {
  71   GtkCssValue *hoffset, *voffset, *radius, *spread, *color;
  72   GtkCssDependencies child_deps;
  73
  74   child_deps = 0;
  75   hoffset = _gtk_css_value_compute (shadow->hoffset, property_id, provider, values, parent_values, &child_deps);
  76   *dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
  77
  78   child_deps = 0;
  79   voffset = _gtk_css_value_compute (shadow->voffset, property_id, provider, values, parent_values, &child_deps);
  80   *dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
  81
  82   child_deps = 0;
  83   radius = _gtk_css_value_compute (shadow->radius, property_id, provider, values, parent_values, &child_deps);
  84   *dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
  85
  86   child_deps = 0;
  87   spread = _gtk_css_value_compute (shadow->spread, property_id, provider, values, parent_values, &child_deps),
  88   *dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
  89
  90   child_deps = 0;
  91   color = _gtk_css_value_compute (shadow->color, property_id, provider, values, parent_values, &child_deps);
  92   *dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
  93
  94   return gtk_css_shadow_value_new (hoffset, voffset, radius, spread, shadow->inset, color);
  95 }
  96
  97 static gboolean
  98 gtk_css_value_shadow_equal (const GtkCssValue *shadow1,
  99                             const GtkCssValue *shadow2)
 100 {
 101   return shadow1->inset == shadow2->inset
 102       && _gtk_css_value_equal (shadow1->hoffset, shadow2->hoffset)
 103       && _gtk_css_value_equal (shadow1->voffset, shadow2->voffset)
 104       && _gtk_css_value_equal (shadow1->radius, shadow2->radius)
 105       && _gtk_css_value_equal (shadow1->spread, shadow2->spread)
 106       && _gtk_css_value_equal (shadow1->color, shadow2->color);
 107 }
 108
 109 static GtkCssValue *
 110 gtk_css_value_shadow_transition (GtkCssValue *start,
 111                                  GtkCssValue *end,
 112                                  guint        property_id,
 113                                  double       progress)
 114 {
 115   if (start->inset != end->inset)
 116     return NULL;
 117
 118   return gtk_css_shadow_value_new (_gtk_css_value_transition (start->hoffset, end->hoffset, property_id, progress),
 119                                    _gtk_css_value_transition (start->voffset, end->voffset, property_id, progress),
 120                                    _gtk_css_value_transition (start->radius, end->radius, property_id, progress),
 121                                    _gtk_css_value_transition (start->spread, end->spread, property_id, progress),
 122                                    start->inset,
 123                                    _gtk_css_value_transition (start->color, end->color, property_id, progress));
 124 }
 125
 126 static void
 127 gtk_css_value_shadow_print (const GtkCssValue *shadow,
 128                             GString           *string)
 129 {
 130   _gtk_css_value_print (shadow->hoffset, string);
 131   g_string_append_c (string, ' ');
 132   _gtk_css_value_print (shadow->voffset, string);
 133   g_string_append_c (string, ' ');
 134   if (_gtk_css_number_value_get (shadow->radius, 100) != 0 ||
 135       _gtk_css_number_value_get (shadow->spread, 100) != 0)
 136     {
 137       _gtk_css_value_print (shadow->radius, string);
 138       g_string_append_c (string, ' ');
 139     }
 140
 141   if (_gtk_css_number_value_get (shadow->spread, 100) != 0)
 142     {
 143       _gtk_css_value_print (shadow->spread, string);
 144       g_string_append_c (string, ' ');
 145     }
 146
 147   _gtk_css_value_print (shadow->color, string);
 148
 149   if (shadow->inset)
 150     g_string_append (string, " inset");
 151
 152 }
 153
 154 static const GtkCssValueClass GTK_CSS_VALUE_SHADOW = {
 155   gtk_css_value_shadow_free,
 156   gtk_css_value_shadow_compute,
 157   gtk_css_value_shadow_equal,
 158   gtk_css_value_shadow_transition,
 159   gtk_css_value_shadow_print
 160 };
 161
 162 static GtkCssValue *
 163 gtk_css_shadow_value_new (GtkCssValue *hoffset,
 164                           GtkCssValue *voffset,
 165                           GtkCssValue *radius,
 166                           GtkCssValue *spread,
 167                           gboolean     inset,
 168                           GtkCssValue *color)
 169 {
 170   GtkCssValue *retval;
 171
 172   retval = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_SHADOW);
 173
 174   retval->hoffset = hoffset;
 175   retval->voffset = voffset;
 176   retval->radius = radius;
 177   retval->spread = spread;
 178   retval->inset = inset;
 179   retval->color = color;
 180
 181   return retval;
 182 }
 183
 184 GtkCssValue *
 185 _gtk_css_shadow_value_new_for_transition (GtkCssValue *target)
 186 {
 187   GdkRGBA transparent = { 0, 0, 0, 0 };
 188
 189   g_return_val_if_fail (target->class == &GTK_CSS_VALUE_SHADOW, NULL);
 190
 191   return gtk_css_shadow_value_new (_gtk_css_number_value_new (0, GTK_CSS_PX),
 192                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 193                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 194                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 195                                    target->inset,
 196                                    _gtk_css_rgba_value_new_from_rgba (&transparent));
 197 }
 198
 199 static gboolean
 200 value_is_done_parsing (GtkCssParser *parser)
 201 {
 202   return _gtk_css_parser_is_eof (parser) ||
 203          _gtk_css_parser_begins_with (parser, ',') ||
 204          _gtk_css_parser_begins_with (parser, ';') ||
 205          _gtk_css_parser_begins_with (parser, '}');
 206 }
 207
 208 GtkCssValue *
 209 _gtk_css_shadow_value_parse (GtkCssParser *parser)
 210 {
 211   enum {
 212     HOFFSET,
 213     VOFFSET,
 214     RADIUS,
 215     SPREAD,
 216     COLOR,
 217     N_VALUES
 218   };
 219   GtkCssValue *values[N_VALUES] = { NULL, };
 220   gboolean inset;
 221   guint i;
 222
 223   inset = _gtk_css_parser_try (parser, "inset", TRUE);
 224
 225   do
 226   {
 227     if (values[HOFFSET] == NULL &&
 228          _gtk_css_parser_has_number (parser))
 229       {
 230         values[HOFFSET] = _gtk_css_number_value_parse (parser,
 231                                                        GTK_CSS_PARSE_LENGTH
 232                                                        | GTK_CSS_NUMBER_AS_PIXELS);
 233         if (values[HOFFSET] == NULL)
 234           goto fail;
 235
 236         values[VOFFSET] = _gtk_css_number_value_parse (parser,
 237                                                        GTK_CSS_PARSE_LENGTH
 238                                                        | GTK_CSS_NUMBER_AS_PIXELS);
 239         if (values[VOFFSET] == NULL)
 240           goto fail;
 241
 242         if (_gtk_css_parser_has_number (parser))
 243           {
 244             values[RADIUS] = _gtk_css_number_value_parse (parser,
 245                                                           GTK_CSS_PARSE_LENGTH
 246                                                           | GTK_CSS_POSITIVE_ONLY
 247                                                           | GTK_CSS_NUMBER_AS_PIXELS);
 248             if (values[RADIUS] == NULL)
 249               goto fail;
 250           }
 251         else
 252           values[RADIUS] = _gtk_css_number_value_new (0.0, GTK_CSS_PX);
 253
 254         if (_gtk_css_parser_has_number (parser))
 255           {
 256             values[SPREAD] = _gtk_css_number_value_parse (parser,
 257                                                           GTK_CSS_PARSE_LENGTH
 258                                                           | GTK_CSS_NUMBER_AS_PIXELS);
 259             if (values[SPREAD] == NULL)
 260               goto fail;
 261           }
 262         else
 263           values[SPREAD] = _gtk_css_number_value_new (0.0, GTK_CSS_PX);
 264       }
 265     else if (!inset && _gtk_css_parser_try (parser, "inset", TRUE))
 266       {
 267         if (values[HOFFSET] == NULL)
 268           goto fail;
 269         inset = TRUE;
 270         break;
 271       }
 272     else if (values[COLOR] == NULL)
 273       {
 274         values[COLOR] = _gtk_css_color_value_parse (parser);
 275
 276         if (values[COLOR] == NULL)
 277           goto fail;
 278       }
 279     else
 280       {
 281         /* We parsed everything and there's still stuff left?
 282          * Pretend we didn't notice and let the normal code produce
 283          * a 'junk at end of value' error */
 284         goto fail;
 285       }
 286   }
 287   while (values[HOFFSET] == NULL || !value_is_done_parsing (parser));
 288
 289   if (values[COLOR] == NULL)
 290     values[COLOR] = _gtk_css_color_value_new_current_color ();
 291
 292   return gtk_css_shadow_value_new (values[HOFFSET], values[VOFFSET],
 293                                    values[RADIUS], values[SPREAD],
 294                                    inset, values[COLOR]);
 295
 296 fail:
 297   for (i = 0; i < N_VALUES; i++)
 298     {
 299       if (values[i])
 300         _gtk_css_value_unref (values[i]);
 301     }
 302
 303   return NULL;
 304 }
 305
 306 static const cairo_user_data_key_t shadow_key;
 307
 308 static cairo_t *
 309 gtk_css_shadow_value_start_drawing (const GtkCssValue *shadow,
 310                                     cairo_t           *cr)
 311 {
 312   cairo_rectangle_int_t clip_rect;
 313   cairo_surface_t *surface;
 314   cairo_t *blur_cr;
 315   gdouble radius;
 316
 317   radius = _gtk_css_number_value_get (shadow->radius, 0);
 318   if (radius == 0.0)
 319     return cr;
 320
 321   gdk_cairo_get_clip_rectangle (cr, &clip_rect);
 322
 323   /* Create a larger surface to center the blur. */
 324   surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
 325                                         clip_rect.width + 2 * radius,
 326                                         clip_rect.height + 2 * radius);
 327   cairo_surface_set_device_offset (surface, radius - clip_rect.x, radius - clip_rect.y);
 328   blur_cr = cairo_create (surface);
 329   cairo_set_user_data (blur_cr, &shadow_key, cairo_reference (cr), (cairo_destroy_func_t) cairo_destroy);
 330
 331   if (cairo_has_current_point (cr))
 332     {
 333       double x, y;
 334
 335       cairo_get_current_point (cr, &x, &y);
 336       cairo_move_to (blur_cr, x, y);
 337     }
 338
 339   return blur_cr;
 340 }
 341
 342 static cairo_t *
 343 gtk_css_shadow_value_finish_drawing (const GtkCssValue *shadow,
 344                                      cairo_t           *cr)
 345 {
 346   gdouble radius;
 347   cairo_t *original_cr;
 348   cairo_surface_t *surface;
 349
 350   radius = _gtk_css_number_value_get (shadow->radius, 0);
 351   if (radius == 0.0)
 352     return cr;
 353
 354   surface = cairo_get_target (cr);
 355   original_cr = cairo_get_user_data (cr, &shadow_key);
 356
 357   /* Blur the surface. */
 358   _gtk_cairo_blur_surface (surface, radius);
 359
 360   cairo_set_source_surface (original_cr, surface, 0, 0);
 361   cairo_paint (original_cr);
 362
 363   cairo_destroy (cr);
 364   cairo_surface_destroy (surface);
 365
 366   return original_cr;
 367 }
 368
 369 void
 370 _gtk_css_shadow_value_paint_layout (const GtkCssValue *shadow,
 371                                     cairo_t           *cr,
 372                                     PangoLayout       *layout)
 373 {
 374   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 375
 376   if (!cairo_has_current_point (cr))
 377     cairo_move_to (cr, 0, 0);
 378
 379   cairo_save (cr);
 380
 381   cairo_rel_move_to (cr,
 382                      _gtk_css_number_value_get (shadow->hoffset, 0),
 383                      _gtk_css_number_value_get (shadow->voffset, 0));
 384
 385   cr = gtk_css_shadow_value_start_drawing (shadow, cr);
 386
 387   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 388   _gtk_pango_fill_layout (cr, layout);
 389
 390   cr = gtk_css_shadow_value_finish_drawing (shadow, cr);
 391
 392   cairo_rel_move_to (cr,
 393                      - _gtk_css_number_value_get (shadow->hoffset, 0),
 394                      - _gtk_css_number_value_get (shadow->voffset, 0));
 395   cairo_restore (cr);
 396 }
 397
 398 void
 399 _gtk_css_shadow_value_paint_icon (const GtkCssValue *shadow,
 400                                   cairo_t           *cr)
 401 {
 402   cairo_pattern_t *pattern;
 403
 404   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 405
 406   cairo_save (cr);
 407   pattern = cairo_pattern_reference (cairo_get_source (cr));
 408
 409   cr = gtk_css_shadow_value_start_drawing (shadow, cr);
 410
 411   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 412
 413   cairo_translate (cr,
 414                    _gtk_css_number_value_get (shadow->hoffset, 0),
 415                    _gtk_css_number_value_get (shadow->voffset, 0));
 416   cairo_mask (cr, pattern);
 417
 418   cr = gtk_css_shadow_value_finish_drawing (shadow, cr);
 419
 420   cairo_restore (cr);
 421   cairo_pattern_destroy (pattern);
 422 }
 423
 424 void
 425 _gtk_css_shadow_value_paint_spinner (const GtkCssValue *shadow,
 426                                      cairo_t           *cr,
 427                                      gdouble            radius,
 428                                      gdouble            progress)
 429 {
 430   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 431
 432   cairo_save (cr);
 433
 434   cr = gtk_css_shadow_value_start_drawing (shadow, cr);
 435
 436   cairo_translate (cr,
 437                    _gtk_css_number_value_get (shadow->hoffset, 0),
 438                    _gtk_css_number_value_get (shadow->voffset, 0));
 439   _gtk_theming_engine_paint_spinner (cr,
 440                                      radius, progress,
 441                                      _gtk_css_rgba_value_get_rgba (shadow->color));
 442
 443   cr = gtk_css_shadow_value_finish_drawing (shadow, cr);
 444
 445   cairo_restore (cr);
 446 }
 447
 448 void
 449 _gtk_css_shadow_value_paint_box (const GtkCssValue   *shadow,
 450                                  cairo_t             *cr,
 451                                  const GtkRoundedBox *padding_box)
 452 {
 453   GtkRoundedBox box, clip_box;
 454   double spread, radius;
 455
 456   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 457
 458   cairo_save (cr);
 459
 460   _gtk_rounded_box_path (padding_box, cr);
 461   cairo_clip (cr);
 462
 463   box = *padding_box;
 464   _gtk_rounded_box_move (&box,
 465                          _gtk_css_number_value_get (shadow->hoffset, 0),
 466                          _gtk_css_number_value_get (shadow->voffset, 0));
 467   spread = _gtk_css_number_value_get (shadow->spread, 0);
 468   _gtk_rounded_box_shrink (&box, spread, spread, spread, spread);
 469
 470   clip_box = *padding_box;
 471   radius = _gtk_css_number_value_get (shadow->radius, 0);
 472   _gtk_rounded_box_shrink (&clip_box, -radius, -radius, -radius, -radius);
 473
 474   cr = gtk_css_shadow_value_start_drawing (shadow, cr);
 475
 476   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
 477   _gtk_rounded_box_path (&box, cr);
 478   _gtk_rounded_box_clip_path (&clip_box, cr);
 479
 480   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 481   cairo_fill (cr);
 482
 483   cr = gtk_css_shadow_value_finish_drawing (shadow, cr);
 484
 485   cairo_restore (cr);
 486 }