libswfdec/swfdec_filter.c

   1 /* Swfdec
   2  * Copyright (C) 2007 Benjamin Otte <otte@gnome.org>
   3  *               2007 Pekka Lampila <pekka.lampila@iki.fi>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18  * Boston, MA  02110-1301  USA
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include "swfdec_filter.h"
  26 #include "swfdec_debug.h"
  27
  28 G_DEFINE_ABSTRACT_TYPE (SwfdecFilter, swfdec_filter, SWFDEC_TYPE_AS_OBJECT)
  29
  30 static void
  31 swfdec_filter_class_init (SwfdecFilterClass *klass)
  32 {
  33 }
  34
  35 static void
  36 swfdec_filter_init (SwfdecFilter *array)
  37 {
  38 }
  39
  40 cairo_pattern_t *
  41 swfdec_filter_apply (SwfdecFilter *filter, cairo_pattern_t *pattern)
  42 {
  43   SwfdecFilterClass *klass;
  44   cairo_pattern_t *ret;
  45
  46   g_return_val_if_fail (SWFDEC_IS_FILTER (filter), NULL);
  47   g_return_val_if_fail (pattern != NULL, NULL);
  48
  49   klass = SWFDEC_FILTER_GET_CLASS (filter);
  50   g_assert (klass->apply);
  51
  52   ret = klass->apply (filter, pattern);
  53   cairo_pattern_destroy (pattern);
  54   return ret;
  55 }
  56
  57 GSList *
  58 swfdec_filter_parse (SwfdecPlayer *player, SwfdecBits *bits)
  59 {
  60   GSList *filters = NULL;
  61   guint i, n_filters, filter_id;
  62
  63   g_return_val_if_fail (SWFDEC_IS_PLAYER (player), NULL);
  64   g_return_val_if_fail (bits != NULL, NULL);
  65
  66   n_filters = swfdec_bits_get_u8 (bits);
  67   SWFDEC_LOG ("  filters: %u", n_filters);
  68   for (i = 0; i < n_filters && swfdec_bits_left (bits); i++) {
  69     filter_id = swfdec_bits_get_u8 (bits);
  70     switch (filter_id) {
  71       case 0:
  72         SWFDEC_WARNING ("    drop shadow");
  73         swfdec_bits_skip_bytes (bits, 16);
  74         break;
  75       case 1:
  76         SWFDEC_WARNING ("    blur");
  77         swfdec_bits_skip_bytes (bits, 9);
  78         break;
  79       case 2:
  80         SWFDEC_WARNING ("    glow");
  81         swfdec_bits_skip_bytes (bits, 15);
  82         break;
  83       case 3:
  84         SWFDEC_WARNING ("    bevel");
  85         swfdec_bits_skip_bytes (bits, 27);
  86         break;
  87       case 4:
  88         {
  89           guint n;
  90           n = swfdec_bits_get_u8 (bits);
  91           SWFDEC_WARNING ("    gradient glow");
  92           swfdec_bits_skip_bytes (bits, n * 5 + 19);
  93         }
  94         break;
  95       case 5:
  96         {
  97           guint x, y;
  98           x = swfdec_bits_get_u8 (bits);
  99           y = swfdec_bits_get_u8 (bits);
 100           SWFDEC_WARNING ("    %u x %u convolution", x, y);
 101           swfdec_bits_skip_bytes (bits, (x + y) * 4 + 13);
 102         }
 103         break;
 104       case 6:
 105         SWFDEC_WARNING ("    color matrix");
 106         swfdec_bits_skip_bytes (bits, 20 * 4);
 107         break;
 108       case 7:
 109         {
 110           guint n;
 111           n = swfdec_bits_get_u8 (bits);
 112           SWFDEC_WARNING ("    gradient bevel");
 113           swfdec_bits_skip_bytes (bits, n * 5 + 19);
 114         }
 115         break;
 116       default:
 117         SWFDEC_ERROR ("unknown filter id %u", filter_id);
 118         break;
 119     }
 120   }
 121
 122   filters = g_slist_reverse (filters);
 123   return filters;
 124 }
 125