libguile/uniform.c

   1 /* Copyright (C) 1995,1996,1997,1998,2000,2001,2002,2003,2004, 2005, 2006, 2009, 2010, 2013, 2014 Free Software Foundation, Inc.
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public License
   5  * as published by the Free Software Foundation; either version 3 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301 USA
  17  */
  18
  19
  20 \f
  21
  22 #ifdef HAVE_CONFIG_H
  23 #  include <config.h>
  24 #endif
  25
  26 #include "libguile/_scm.h"
  27 #include "libguile/__scm.h"
  28
  29 #include "libguile/uniform.h"
  30
  31
  32 const size_t scm_i_array_element_type_sizes[SCM_ARRAY_ELEMENT_TYPE_LAST + 1] = {
  33   0,
  34   0,
  35   1,
  36   8,
  37   8, 8,
  38   16, 16,
  39   32, 32,
  40   64, 64,
  41   32, 64,
  42   64, 128
  43 };
  44
  45 size_t
  46 scm_array_handle_uniform_element_size (scm_t_array_handle *h)
  47 {
  48   size_t ret = scm_i_array_element_type_sizes[h->element_type];
  49   if (ret && ret % 8 == 0)
  50     return ret / 8;
  51   else if (ret)
  52     scm_wrong_type_arg_msg (NULL, 0, h->array, "byte-aligned uniform array");
  53   else
  54     scm_wrong_type_arg_msg (NULL, 0, h->array, "uniform array");
  55 }
  56
  57 size_t
  58 scm_array_handle_uniform_element_bit_size (scm_t_array_handle *h)
  59 {
  60   size_t ret = scm_i_array_element_type_sizes[h->element_type];
  61   if (ret)
  62     return ret;
  63   else
  64     scm_wrong_type_arg_msg (NULL, 0, h->array, "uniform array");
  65 }
  66
  67 const void *
  68 scm_array_handle_uniform_elements (scm_t_array_handle *h)
  69 {
  70   return scm_array_handle_uniform_writable_elements (h);
  71 }
  72
  73 void *
  74 scm_array_handle_uniform_writable_elements (scm_t_array_handle *h)
  75 {
  76   size_t esize;
  77   scm_t_uint8 *ret;
  78
  79   esize = scm_array_handle_uniform_element_size (h);
  80   ret = ((scm_t_uint8*) h->writable_elements) + h->base * esize;
  81   return ret;
  82 }
  83
  84 void
  85 scm_init_uniform (void)
  86 {
  87 #include "libguile/uniform.x"
  88 }
  89
  90 /*
  91   Local Variables:
  92   c-file-style: "gnu"
  93   End:
  94 */