adg/adg-primitive.c

   1 /* ADG - Automatic Drawing Generation
   2  * Copyright (C) 2007,2008,2009 Nicola Fontana <ntd at entidi.it>
   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., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301, USA.
  18  */
  19
  20
  21 /**
  22  * SECTION:primitive
  23  * @title: AdgPrimitive
  24  * @short_description: A GObject based wrapper for the #CpmlPrimitive struct
  25  *
  26  * The AdgPrimitive is a wrapper typedef in #GType syntax of the
  27  * #CpmlPrimitive struct. Furthermore, some dynamic memory functions
  28  * are provided, such as shallow and deep duplication, as the CPML
  29  * library does not have dynamic memory APIs.
  30  **/
  31
  32 /**
  33  * AdgPrimitive:
  34  *
  35  * Another name for the #CpmlPrimitive type: check its documentation
  36  * for fields description.
  37  **/
  38
  39
  40 #include "adg-primitive.h"
  41
  42 #include <string.h>
  43
  44
  45 GType
  46 adg_primitive_get_type(void)
  47 {
  48     static int primitive_type = 0;
  49
  50     if (G_UNLIKELY(primitive_type == 0))
  51         primitive_type = g_boxed_type_register_static("AdgPrimitive",
  52                                                       (GBoxedCopyFunc) adg_primitive_dup,
  53                                                       g_free);
  54
  55     return primitive_type;
  56 }
  57
  58 /**
  59  * adg_primitive_dup:
  60  * @primitive: an #AdgPrimitive structure
  61  *
  62  * Duplicates @primitive. This function makes a shallow duplication of
  63  * @primitives, that is the internal pointers of the resulting primitive
  64  * struct refer to the same memory as the original @primitive. Check
  65  * out adg_primitive_deep_dup() if it is required also the content
  66  * duplication.
  67  *
  68  * Return value: a shallow duplicate of @primitive: must be freed
  69  *               with g_free() when no longer needed.
  70  **/
  71 AdgPrimitive *
  72 adg_primitive_dup(const AdgPrimitive *primitive)
  73 {
  74     return g_memdup(primitive, sizeof(AdgPrimitive));
  75 }
  76
  77 /**
  78  * adg_primitive_deep_dup:
  79  * @primitive: an #AdgPrimitive structure
  80  *
  81  * Duplicates @primitive. This function makes a deep duplication of
  82  * @primitive, that is it duplicates also the definition data (both
  83  * <structfield>org</structfield> and <structfield>data</structfield>).
  84  * The <structfield>segment</structfield> field instead is set to
  85  * %NULL as the parent segment is not duplicated.
  86  *
  87  * All the data is allocated in the same chunk of memory so freeing
  88  * the returned pointer releases all the occupied memory.
  89  *
  90  * Return value: a deep duplicate of @primitive: must be freed
  91  *               with g_free() when no longer needed.
  92  **/
  93 AdgPrimitive *
  94 adg_primitive_deep_dup(const AdgPrimitive *primitive)
  95 {
  96     AdgPrimitive *dest;
  97     gsize primitive_size, org_size, data_size;
  98     cairo_path_data_t *p_data;
  99
 100     primitive_size = sizeof(AdgPrimitive);
 101     org_size = primitive->org == NULL ? 0 : sizeof(cairo_path_data_t);
 102     data_size = primitive->data == NULL ?
 103         0 : sizeof(cairo_path_data_t) * primitive->data->header.length;
 104     dest = (AdgPrimitive *) g_malloc(primitive_size + org_size + data_size);
 105     p_data = (cairo_path_data_t *) ((gchar *) dest + primitive_size);
 106
 107     dest->segment = NULL;
 108
 109     if (primitive->org != NULL) {
 110         dest->org = p_data;
 111         memcpy(p_data, primitive->org, org_size);
 112         ++ p_data;
 113     } else {
 114         dest->org = NULL;
 115     }
 116
 117     if (data_size > 0)
 118         dest->data = memcpy(p_data, primitive->data, data_size);
 119     else
 120         dest->data = NULL;
 121
 122     return dest;
 123 }