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 "gtkcssnumbervalueprivate.h"
  25 #include "gtkcssrgbavalueprivate.h"
  26 #include "gtkstylecontextprivate.h"
  27 #include "gtksymboliccolorprivate.h"
  28 #include "gtkthemingengineprivate.h"
  29 #include "gtkpango.h"
  30
  31 struct _GtkCssValue {
  32   GTK_CSS_VALUE_BASE
  33   guint inset :1;
  34
  35   GtkCssValue *hoffset;
  36   GtkCssValue *voffset;
  37   GtkCssValue *radius;
  38   GtkCssValue *spread;
  39
  40   GtkCssValue *color;
  41 };
  42
  43 static GtkCssValue *    gtk_css_shadow_value_new (GtkCssValue *hoffset,
  44                                                   GtkCssValue *voffset,
  45                                                   GtkCssValue *radius,
  46                                                   GtkCssValue *spread,
  47                                                   gboolean     inset,
  48                                                   GtkCssValue *color);
  49
  50 static void
  51 gtk_css_value_shadow_free (GtkCssValue *shadow)
  52 {
  53   _gtk_css_value_unref (shadow->hoffset);
  54   _gtk_css_value_unref (shadow->voffset);
  55   _gtk_css_value_unref (shadow->radius);
  56   _gtk_css_value_unref (shadow->spread);
  57   _gtk_css_value_unref (shadow->color);
  58
  59   g_slice_free (GtkCssValue, shadow);
  60 }
  61
  62 static gboolean
  63 gtk_css_value_shadow_equal (const GtkCssValue *shadow1,
  64                             const GtkCssValue *shadow2)
  65 {
  66   return shadow1->inset == shadow2->inset
  67       && _gtk_css_value_equal (shadow1->hoffset, shadow2->hoffset)
  68       && _gtk_css_value_equal (shadow1->voffset, shadow2->voffset)
  69       && _gtk_css_value_equal (shadow1->radius, shadow2->radius)
  70       && _gtk_css_value_equal (shadow1->spread, shadow2->spread)
  71       && _gtk_css_value_equal (shadow1->color, shadow2->color);
  72 }
  73
  74 static GtkCssValue *
  75 gtk_css_value_shadow_transition (GtkCssValue *start,
  76                                  GtkCssValue *end,
  77                                  double       progress)
  78 {
  79   if (start->inset != end->inset)
  80     return NULL;
  81
  82   return gtk_css_shadow_value_new (_gtk_css_value_transition (start->hoffset, end->hoffset, progress),
  83                                    _gtk_css_value_transition (start->voffset, end->voffset, progress),
  84                                    _gtk_css_value_transition (start->radius, end->radius, progress),
  85                                    _gtk_css_value_transition (start->spread, end->spread, progress),
  86                                    start->inset,
  87                                    _gtk_css_value_transition (start->color, end->color, progress));
  88 }
  89
  90 static void
  91 gtk_css_value_shadow_print (const GtkCssValue *shadow,
  92                             GString           *string)
  93 {
  94   _gtk_css_value_print (shadow->hoffset, string);
  95   g_string_append_c (string, ' ');
  96   _gtk_css_value_print (shadow->voffset, string);
  97   g_string_append_c (string, ' ');
  98   if (_gtk_css_number_value_get (shadow->radius, 100) != 0 ||
  99       _gtk_css_number_value_get (shadow->spread, 100) != 0)
 100     {
 101       _gtk_css_value_print (shadow->radius, string);
 102       g_string_append_c (string, ' ');
 103     }
 104
 105   if (_gtk_css_number_value_get (shadow->spread, 100) != 0)
 106     {
 107       _gtk_css_value_print (shadow->spread, string);
 108       g_string_append_c (string, ' ');
 109     }
 110
 111   _gtk_css_value_print (shadow->color, string);
 112
 113   if (shadow->inset)
 114     g_string_append (string, " inset");
 115
 116 }
 117
 118 static const GtkCssValueClass GTK_CSS_VALUE_SHADOW = {
 119   gtk_css_value_shadow_free,
 120   gtk_css_value_shadow_equal,
 121   gtk_css_value_shadow_transition,
 122   gtk_css_value_shadow_print
 123 };
 124
 125 static GtkCssValue *
 126 gtk_css_shadow_value_new (GtkCssValue *hoffset,
 127                           GtkCssValue *voffset,
 128                           GtkCssValue *radius,
 129                           GtkCssValue *spread,
 130                           gboolean     inset,
 131                           GtkCssValue *color)
 132 {
 133   GtkCssValue *retval;
 134
 135   retval = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_SHADOW);
 136
 137   retval->hoffset = hoffset;
 138   retval->voffset = voffset;
 139   retval->radius = radius;
 140   retval->spread = spread;
 141   retval->inset = inset;
 142   retval->color = color;
 143
 144   return retval;
 145 }
 146
 147 GtkCssValue *
 148 _gtk_css_shadow_value_new_for_transition (GtkCssValue *target)
 149 {
 150   GdkRGBA transparent = { 0, 0, 0, 0 };
 151
 152   g_return_val_if_fail (target->class == &GTK_CSS_VALUE_SHADOW, NULL);
 153
 154   return gtk_css_shadow_value_new (_gtk_css_number_value_new (0, GTK_CSS_PX),
 155                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 156                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 157                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 158                                    target->inset,
 159                                    _gtk_css_rgba_value_new_from_rgba (&transparent));
 160 }
 161
 162 static gboolean
 163 value_is_done_parsing (GtkCssParser *parser)
 164 {
 165   return _gtk_css_parser_is_eof (parser) ||
 166          _gtk_css_parser_begins_with (parser, ',') ||
 167          _gtk_css_parser_begins_with (parser, ';') ||
 168          _gtk_css_parser_begins_with (parser, '}');
 169 }
 170
 171 GtkCssValue *
 172 _gtk_css_shadow_value_parse (GtkCssParser *parser)
 173 {
 174   enum {
 175     HOFFSET,
 176     VOFFSET,
 177     RADIUS,
 178     SPREAD,
 179     COLOR,
 180     N_VALUES
 181   };
 182   GtkCssValue *values[N_VALUES] = { NULL, };
 183   gboolean inset;
 184   guint i;
 185
 186   inset = _gtk_css_parser_try (parser, "inset", TRUE);
 187
 188   do
 189   {
 190     if (values[HOFFSET] == NULL &&
 191          _gtk_css_parser_has_number (parser))
 192       {
 193         values[HOFFSET] = _gtk_css_number_value_parse (parser,
 194                                                        GTK_CSS_PARSE_LENGTH
 195                                                        | GTK_CSS_NUMBER_AS_PIXELS);
 196         if (values[HOFFSET] == NULL)
 197           goto fail;
 198
 199         values[VOFFSET] = _gtk_css_number_value_parse (parser,
 200                                                        GTK_CSS_PARSE_LENGTH
 201                                                        | GTK_CSS_NUMBER_AS_PIXELS);
 202         if (values[VOFFSET] == NULL)
 203           goto fail;
 204
 205         if (_gtk_css_parser_has_number (parser))
 206           {
 207             values[RADIUS] = _gtk_css_number_value_parse (parser,
 208                                                           GTK_CSS_PARSE_LENGTH
 209                                                           | GTK_CSS_POSITIVE_ONLY
 210                                                           | GTK_CSS_NUMBER_AS_PIXELS);
 211             if (values[RADIUS] == NULL)
 212               goto fail;
 213           }
 214         else
 215           values[RADIUS] = _gtk_css_number_value_new (0.0, GTK_CSS_PX);
 216
 217         if (_gtk_css_parser_has_number (parser))
 218           {
 219             values[SPREAD] = _gtk_css_number_value_parse (parser,
 220                                                           GTK_CSS_PARSE_LENGTH
 221                                                           | GTK_CSS_NUMBER_AS_PIXELS);
 222             if (values[SPREAD] == NULL)
 223               goto fail;
 224           }
 225         else
 226           values[SPREAD] = _gtk_css_number_value_new (0.0, GTK_CSS_PX);
 227       }
 228     else if (!inset && _gtk_css_parser_try (parser, "inset", TRUE))
 229       {
 230         if (values[HOFFSET] == NULL)
 231           goto fail;
 232         inset = TRUE;
 233         break;
 234       }
 235     else if (values[COLOR] == NULL)
 236       {
 237         values[COLOR] = _gtk_css_symbolic_value_new (parser);
 238
 239         if (values[COLOR] == NULL)
 240           goto fail;
 241       }
 242     else
 243       {
 244         /* We parsed everything and there's still stuff left?
 245          * Pretend we didn't notice and let the normal code produce
 246          * a 'junk at end of value' error */
 247         goto fail;
 248       }
 249   }
 250   while (values[HOFFSET] == NULL || !value_is_done_parsing (parser));
 251
 252   if (values[COLOR] == NULL)
 253     values[COLOR] = _gtk_css_symbolic_value_new_take_symbolic_color (
 254                       gtk_symbolic_color_ref (
 255                         _gtk_symbolic_color_get_current_color ()));
 256
 257   return gtk_css_shadow_value_new (values[HOFFSET], values[VOFFSET],
 258                                    values[RADIUS], values[SPREAD],
 259                                    inset, values[COLOR]);
 260
 261 fail:
 262   for (i = 0; i < N_VALUES; i++)
 263     {
 264       if (values[i])
 265         _gtk_css_value_unref (values[i]);
 266     }
 267
 268   return NULL;
 269 }
 270
 271 GtkCssValue *
 272 _gtk_css_shadow_value_compute (GtkCssValue     *shadow,
 273                                GtkStyleContext *context)
 274 {
 275   GdkRGBA transparent = { 0, 0, 0, 0 };
 276   GtkCssValue *color, *fallback;
 277
 278   fallback = _gtk_css_symbolic_value_new_take_symbolic_color (gtk_symbolic_color_new_literal (&transparent));
 279   color = _gtk_css_rgba_value_compute_from_symbolic (shadow->color,
 280                                                      fallback,
 281                                                      context,
 282                                                      FALSE);
 283   _gtk_css_value_unref (fallback);
 284
 285   return gtk_css_shadow_value_new (_gtk_css_number_value_compute (shadow->hoffset, context),
 286                                    _gtk_css_number_value_compute (shadow->voffset, context),
 287                                    _gtk_css_number_value_compute (shadow->radius, context),
 288                                    _gtk_css_number_value_compute (shadow->spread, context),
 289                                    shadow->inset,
 290                                    color);
 291 }
 292
 293 void
 294 _gtk_css_shadow_value_paint_layout (const GtkCssValue *shadow,
 295                                     cairo_t           *cr,
 296                                     PangoLayout       *layout)
 297 {
 298   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 299
 300   if (!cairo_has_current_point (cr))
 301     cairo_move_to (cr, 0, 0);
 302
 303   cairo_save (cr);
 304
 305   cairo_rel_move_to (cr,
 306                      _gtk_css_number_value_get (shadow->hoffset, 0),
 307                      _gtk_css_number_value_get (shadow->voffset, 0));
 308   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 309   _gtk_pango_fill_layout (cr, layout);
 310
 311   cairo_rel_move_to (cr,
 312                      - _gtk_css_number_value_get (shadow->hoffset, 0),
 313                      - _gtk_css_number_value_get (shadow->voffset, 0));
 314   cairo_restore (cr);
 315 }
 316
 317 void
 318 _gtk_css_shadow_value_paint_icon (const GtkCssValue *shadow,
 319                                   cairo_t           *cr)
 320 {
 321   cairo_pattern_t *pattern;
 322
 323   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 324
 325   cairo_save (cr);
 326   pattern = cairo_pattern_reference (cairo_get_source (cr));
 327   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 328
 329   cairo_translate (cr,
 330                    _gtk_css_number_value_get (shadow->hoffset, 0),
 331                    _gtk_css_number_value_get (shadow->voffset, 0));
 332   cairo_mask (cr, pattern);
 333
 334   cairo_restore (cr);
 335   cairo_pattern_destroy (pattern);
 336 }
 337
 338 void
 339 _gtk_css_shadow_value_paint_spinner (const GtkCssValue *shadow,
 340                                      cairo_t           *cr,
 341                                      gdouble            radius,
 342                                      gdouble            progress)
 343 {
 344   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 345
 346   cairo_save (cr);
 347
 348   cairo_translate (cr,
 349                    _gtk_css_number_value_get (shadow->hoffset, 0),
 350                    _gtk_css_number_value_get (shadow->voffset, 0));
 351   _gtk_theming_engine_paint_spinner (cr,
 352                                      radius, progress,
 353                                      _gtk_css_rgba_value_get_rgba (shadow->color));
 354
 355   cairo_restore (cr);
 356 }
 357
 358 void
 359 _gtk_css_shadow_value_paint_box (const GtkCssValue   *shadow,
 360                                  cairo_t             *cr,
 361                                  const GtkRoundedBox *padding_box)
 362 {
 363   GtkRoundedBox box;
 364   double spread;
 365
 366   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 367
 368   cairo_save (cr);
 369   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
 370
 371   _gtk_rounded_box_path (padding_box, cr);
 372   cairo_clip (cr);
 373
 374   box = *padding_box;
 375   _gtk_rounded_box_move (&box,
 376                          _gtk_css_number_value_get (shadow->hoffset, 0),
 377                          _gtk_css_number_value_get (shadow->voffset, 0));
 378   spread = _gtk_css_number_value_get (shadow->spread, 0);
 379   _gtk_rounded_box_shrink (&box, spread, spread, spread, spread);
 380
 381   _gtk_rounded_box_path (&box, cr);
 382   _gtk_rounded_box_clip_path (padding_box, cr);
 383
 384   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 385   cairo_fill (cr);
 386
 387   cairo_restore (cr);
 388 }