arch/all-pc/boot/grub2-aros/grub-core/video/bitmap.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2006,2007  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB 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
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/video.h>
  20 #include <grub/bitmap.h>
  21 #include <grub/types.h>
  22 #include <grub/dl.h>
  23 #include <grub/mm.h>
  24 #include <grub/misc.h>
  25 #include <grub/i18n.h>
  26
  27 GRUB_MOD_LICENSE ("GPLv3+");
  28
  29 /* List of bitmap readers registered to system.  */
  30 static grub_video_bitmap_reader_t bitmap_readers_list;
  31
  32 /* Register bitmap reader.  */
  33 void
  34 grub_video_bitmap_reader_register (grub_video_bitmap_reader_t reader)
  35 {
  36   reader->next = bitmap_readers_list;
  37   bitmap_readers_list = reader;
  38 }
  39
  40 /* Unregister bitmap reader.  */
  41 void
  42 grub_video_bitmap_reader_unregister (grub_video_bitmap_reader_t reader)
  43 {
  44   grub_video_bitmap_reader_t *p, q;
  45
  46   for (p = &bitmap_readers_list, q = *p; q; p = &(q->next), q = q->next)
  47     if (q == reader)
  48       {
  49         *p = q->next;
  50         break;
  51       }
  52 }
  53
  54 /* Creates new bitmap, saves created bitmap on success to *bitmap.  */
  55 grub_err_t
  56 grub_video_bitmap_create (struct grub_video_bitmap **bitmap,
  57                           unsigned int width, unsigned int height,
  58                           enum grub_video_blit_format blit_format)
  59 {
  60   struct grub_video_mode_info *mode_info;
  61   unsigned int size;
  62
  63   if (!bitmap)
  64     return grub_error (GRUB_ERR_BUG, "invalid argument");
  65
  66   *bitmap = 0;
  67
  68   if (width == 0 || height == 0)
  69     return grub_error (GRUB_ERR_BUG, "invalid argument");
  70
  71   *bitmap = (struct grub_video_bitmap *)grub_malloc (sizeof (struct grub_video_bitmap));
  72   if (! *bitmap)
  73     return grub_errno;
  74
  75   mode_info = &((*bitmap)->mode_info);
  76
  77   /* Populate mode_info.  */
  78   mode_info->width = width;
  79   mode_info->height = height;
  80   mode_info->blit_format = blit_format;
  81
  82   switch (blit_format)
  83     {
  84       case GRUB_VIDEO_BLIT_FORMAT_RGBA_8888:
  85         mode_info->mode_type = GRUB_VIDEO_MODE_TYPE_RGB
  86                                | GRUB_VIDEO_MODE_TYPE_ALPHA;
  87         mode_info->bpp = 32;
  88         mode_info->bytes_per_pixel = 4;
  89         mode_info->number_of_colors = 256;
  90         mode_info->red_mask_size = 8;
  91         mode_info->red_field_pos = 0;
  92         mode_info->green_mask_size = 8;
  93         mode_info->green_field_pos = 8;
  94         mode_info->blue_mask_size = 8;
  95         mode_info->blue_field_pos = 16;
  96         mode_info->reserved_mask_size = 8;
  97         mode_info->reserved_field_pos = 24;
  98         break;
  99
 100       case GRUB_VIDEO_BLIT_FORMAT_RGB_888:
 101         mode_info->mode_type = GRUB_VIDEO_MODE_TYPE_RGB;
 102         mode_info->bpp = 24;
 103         mode_info->bytes_per_pixel = 3;
 104         mode_info->number_of_colors = 256;
 105         mode_info->red_mask_size = 8;
 106         mode_info->red_field_pos = 0;
 107         mode_info->green_mask_size = 8;
 108         mode_info->green_field_pos = 8;
 109         mode_info->blue_mask_size = 8;
 110         mode_info->blue_field_pos = 16;
 111         mode_info->reserved_mask_size = 0;
 112         mode_info->reserved_field_pos = 0;
 113         break;
 114
 115       case GRUB_VIDEO_BLIT_FORMAT_INDEXCOLOR:
 116         mode_info->mode_type = GRUB_VIDEO_MODE_TYPE_INDEX_COLOR;
 117         mode_info->bpp = 8;
 118         mode_info->bytes_per_pixel = 1;
 119         mode_info->number_of_colors = 256;
 120         mode_info->red_mask_size = 0;
 121         mode_info->red_field_pos = 0;
 122         mode_info->green_mask_size = 0;
 123         mode_info->green_field_pos = 0;
 124         mode_info->blue_mask_size = 0;
 125         mode_info->blue_field_pos = 0;
 126         mode_info->reserved_mask_size = 0;
 127         mode_info->reserved_field_pos = 0;
 128         break;
 129
 130       default:
 131         grub_free (*bitmap);
 132         *bitmap = 0;
 133
 134         return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 135                            "unsupported bitmap format");
 136     }
 137
 138   mode_info->pitch = width * mode_info->bytes_per_pixel;
 139
 140   /* Calculate size needed for the data.  */
 141   size = (width * mode_info->bytes_per_pixel) * height;
 142
 143   (*bitmap)->data = grub_zalloc (size);
 144   if (! (*bitmap)->data)
 145     {
 146       grub_free (*bitmap);
 147       *bitmap = 0;
 148
 149       return grub_errno;
 150     }
 151
 152   return GRUB_ERR_NONE;
 153 }
 154
 155 /* Frees all resources allocated by bitmap.  */
 156 grub_err_t
 157 grub_video_bitmap_destroy (struct grub_video_bitmap *bitmap)
 158 {
 159   if (! bitmap)
 160     return GRUB_ERR_NONE;
 161
 162   grub_free (bitmap->data);
 163   grub_free (bitmap);
 164
 165   return GRUB_ERR_NONE;
 166 }
 167
 168 /* Match extension to filename.  */
 169 static int
 170 match_extension (const char *filename, const char *ext)
 171 {
 172   int pos;
 173   int ext_len;
 174
 175   pos = grub_strlen (filename);
 176   ext_len = grub_strlen (ext);
 177
 178   if (! pos || ! ext_len || ext_len > pos)
 179     return 0;
 180
 181   pos -= ext_len;
 182
 183   return grub_strcasecmp (filename + pos, ext) == 0;
 184 }
 185
 186 /* Loads bitmap using registered bitmap readers.  */
 187 grub_err_t
 188 grub_video_bitmap_load (struct grub_video_bitmap **bitmap,
 189                         const char *filename)
 190 {
 191   grub_video_bitmap_reader_t reader = bitmap_readers_list;
 192
 193   if (!bitmap)
 194     return grub_error (GRUB_ERR_BUG, "invalid argument");
 195
 196   *bitmap = 0;
 197
 198   while (reader)
 199     {
 200       if (match_extension (filename, reader->extension))
 201         return reader->reader (bitmap, filename);
 202
 203       reader = reader->next;
 204     }
 205
 206   return grub_error (GRUB_ERR_BAD_FILE_TYPE,
 207                      /* TRANSLATORS: We're speaking about bitmap images like
 208                         JPEG or PNG.  */
 209                      N_("bitmap file `%s' is of"
 210                         " unsupported format"), filename);
 211 }
 212
 213 /* Return mode info for bitmap.  */
 214 void grub_video_bitmap_get_mode_info (struct grub_video_bitmap *bitmap,
 215                                       struct grub_video_mode_info *mode_info)
 216 {
 217   if (!bitmap)
 218     return;
 219
 220   *mode_info = bitmap->mode_info;
 221 }
 222
 223 /* Return pointer to bitmap's raw data.  */
 224 void *grub_video_bitmap_get_data (struct grub_video_bitmap *bitmap)
 225 {
 226   if (!bitmap)
 227     return 0;
 228
 229   return bitmap->data;
 230 }
 231