summaryrefslogtreecommitdiffstats
path: root/grub-core/video/video.c
blob: 983424107c29469943aa6ca953494e4032cc63ba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2006,2007,2008,2009  Free Software Foundation, Inc.
 *
 *  GRUB is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  GRUB is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <grub/video.h>
#include <grub/types.h>
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/i18n.h>

GRUB_MOD_LICENSE ("GPLv3+");

/* The list of video adapters registered to system.  */
grub_video_adapter_t grub_video_adapter_list = NULL;

/* Active video adapter.  */
grub_video_adapter_t grub_video_adapter_active;

/* Restore back to initial mode (where applicable).  */
grub_err_t
grub_video_restore (void)
{
  if (grub_video_adapter_active)
    {
      grub_video_adapter_active->fini ();
      if (grub_errno != GRUB_ERR_NONE)
        return grub_errno;

      grub_video_adapter_active = 0;
    }
  return GRUB_ERR_NONE;
}

/* Get information about active video mode.  */
grub_err_t
grub_video_get_info (struct grub_video_mode_info *mode_info)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  /* If mode_info is NULL just report that video adapter is active.  */
  if (! mode_info)
    {
      grub_errno = GRUB_ERR_NONE;
      return grub_errno;
    }

  return grub_video_adapter_active->get_info (mode_info);
}

grub_video_driver_id_t
grub_video_get_driver_id (void)
{
  if (! grub_video_adapter_active)
    return GRUB_VIDEO_DRIVER_NONE;
  return grub_video_adapter_active->id;
}

/* Get information about active video mode.  */
grub_err_t
grub_video_get_info_and_fini (struct grub_video_mode_info *mode_info,
			      void **framebuffer)
{
  grub_err_t err;

  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  err = grub_video_adapter_active->get_info_and_fini (mode_info, framebuffer);
  if (err)
    return err;

  grub_video_adapter_active = 0;
  return GRUB_ERR_NONE;
}

/* Determine optimized blitting formation for specified video mode info.  */
enum grub_video_blit_format
grub_video_get_blit_format (struct grub_video_mode_info *mode_info)
{
  /* Check if we have any known 32 bit modes.  */
  if (mode_info->bpp == 32)
    {
      if ((mode_info->red_mask_size == 8)
	  && (mode_info->red_field_pos == 16)
	  && (mode_info->green_mask_size == 8)
	  && (mode_info->green_field_pos == 8)
	  && (mode_info->blue_mask_size == 8)
	  && (mode_info->blue_field_pos == 0))
	{
	  return GRUB_VIDEO_BLIT_FORMAT_BGRA_8888;
	}
      else if ((mode_info->red_mask_size == 8)
	       && (mode_info->red_field_pos == 0)
	       && (mode_info->green_mask_size == 8)
	       && (mode_info->green_field_pos == 8)
	       && (mode_info->blue_mask_size == 8)
	       && (mode_info->blue_field_pos == 16))
	{
	  return GRUB_VIDEO_BLIT_FORMAT_RGBA_8888;
	}
    }
  /* Check if we have any known 24 bit modes.  */
  else if (mode_info->bpp == 24)
    {
      if ((mode_info->red_mask_size == 8)
	  && (mode_info->red_field_pos == 16)
	  && (mode_info->green_mask_size == 8)
	  && (mode_info->green_field_pos == 8)
	  && (mode_info->blue_mask_size == 8)
	  && (mode_info->blue_field_pos == 0))
	{
	  return GRUB_VIDEO_BLIT_FORMAT_BGR_888;
	}
      else if ((mode_info->red_mask_size == 8)
	       && (mode_info->red_field_pos == 0)
	       && (mode_info->green_mask_size == 8)
	       && (mode_info->green_field_pos == 8)
	       && (mode_info->blue_mask_size == 8)
	       && (mode_info->blue_field_pos == 16))
	{
	  return GRUB_VIDEO_BLIT_FORMAT_RGB_888;
	}
    }
  /* Check if we have any known 16 bit modes.  */
  else if (mode_info->bpp == 16)
    {
      if ((mode_info->red_mask_size == 5)
	  && (mode_info->red_field_pos == 11)
	  && (mode_info->green_mask_size == 6)
	  && (mode_info->green_field_pos == 5)
	  && (mode_info->blue_mask_size == 5)
	  && (mode_info->blue_field_pos == 0))
	{
	  return GRUB_VIDEO_BLIT_FORMAT_BGR_565;
	}
      else if ((mode_info->red_mask_size == 5)
	       && (mode_info->red_field_pos == 0)
	       && (mode_info->green_mask_size == 6)
	       && (mode_info->green_field_pos == 5)
	       && (mode_info->blue_mask_size == 5)
	       && (mode_info->blue_field_pos == 11))
	{
	  return GRUB_VIDEO_BLIT_FORMAT_RGB_565;
	}
    }
  else if (mode_info->bpp == 1)
    return GRUB_VIDEO_BLIT_FORMAT_1BIT_PACKED;

  /* Backup route.  Unknown format.  */

  /* If there are more than 8 bits per color, assume RGB(A) mode.  */
  if (mode_info->bpp > 8)
    {
      if (mode_info->reserved_mask_size > 0)
	{
	  return GRUB_VIDEO_BLIT_FORMAT_RGBA;
	}
      else
	{
	  return GRUB_VIDEO_BLIT_FORMAT_RGB;
	}
    }

  /* Assume as indexcolor mode.  */
  return GRUB_VIDEO_BLIT_FORMAT_INDEXCOLOR;
}

/* Set new indexed color palette entries.  */
grub_err_t
grub_video_set_palette (unsigned int start, unsigned int count,
                        struct grub_video_palette_data *palette_data)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->set_palette (start, count, palette_data);
}

/* Get indexed color palette entries.  */
grub_err_t
grub_video_get_palette (unsigned int start, unsigned int count,
                        struct grub_video_palette_data *palette_data)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->get_palette (start, count, palette_data);
}

/* Set viewport dimensions.  */
grub_err_t
grub_video_set_viewport (unsigned int x, unsigned int y,
                         unsigned int width, unsigned int height)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->set_viewport (x, y, width, height);
}

/* Get viewport dimensions.  */
grub_err_t
grub_video_get_viewport (unsigned int *x, unsigned int *y,
                         unsigned int *width, unsigned int *height)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->get_viewport (x, y, width, height);
}

/* Set region dimensions.  */
grub_err_t
grub_video_set_region (unsigned int x, unsigned int y,
                       unsigned int width, unsigned int height)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->set_region (x, y, width, height);
}

/* Get region dimensions.  */
grub_err_t
grub_video_get_region (unsigned int *x, unsigned int *y,
                       unsigned int *width, unsigned int *height)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->get_region (x, y, width, height);
}

/* Set status of the intersection of the viewport and the region.  */
grub_err_t
grub_video_set_area_status (grub_video_area_status_t area_status)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->set_area_status (area_status);
}

/* Get status of the intersection of the viewport and the region.  */
grub_err_t
grub_video_get_area_status (grub_video_area_status_t *area_status)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->get_area_status (area_status);
}

/* Map color name to adapter specific color.  */
grub_video_color_t
grub_video_map_color (grub_uint32_t color_name)
{
  if (! grub_video_adapter_active)
    return 0;

  return grub_video_adapter_active->map_color (color_name);
}

/* Map RGB value to adapter specific color.  */
grub_video_color_t
grub_video_map_rgb (grub_uint8_t red, grub_uint8_t green, grub_uint8_t blue)
{
  if (! grub_video_adapter_active)
    return 0;

  return grub_video_adapter_active->map_rgb (red, green, blue);
}

/* Map RGBA value to adapter specific color.  */
grub_video_color_t
grub_video_map_rgba (grub_uint8_t red, grub_uint8_t green, grub_uint8_t blue,
                     grub_uint8_t alpha)
{
  if (! grub_video_adapter_active)
    return 0;

  return grub_video_adapter_active->map_rgba (red, green, blue, alpha);
}

/* Unmap video color back to RGBA components.  */
grub_err_t
grub_video_unmap_color (grub_video_color_t color, grub_uint8_t *red,
                        grub_uint8_t *green, grub_uint8_t *blue,
                        grub_uint8_t *alpha)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->unmap_color (color,
                                                 red,
                                                 green,
                                                 blue,
                                                 alpha);
}

/* Fill rectangle using specified color.  */
grub_err_t
grub_video_fill_rect (grub_video_color_t color, int x, int y,
                      unsigned int width, unsigned int height)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->fill_rect (color, x, y, width, height);
}

/* Blit bitmap to screen.  */
grub_err_t
grub_video_blit_bitmap (struct grub_video_bitmap *bitmap,
                        enum grub_video_blit_operators oper,
                        int x, int y, int offset_x, int offset_y,
                        unsigned int width, unsigned int height)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->blit_bitmap (bitmap, oper, x, y,
                                                 offset_x, offset_y,
                                                 width, height);
}

/* Blit render target to active render target.  */
grub_err_t
grub_video_blit_render_target (struct grub_video_render_target *target,
                               enum grub_video_blit_operators oper,
                               int x, int y, int offset_x, int offset_y,
                               unsigned int width, unsigned int height)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->blit_render_target (target, oper, x, y,
                                                        offset_x, offset_y,
                                                        width, height);
}

/* Scroll viewport and fill new areas with specified color.  */
grub_err_t
grub_video_scroll (grub_video_color_t color, int dx, int dy)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->scroll (color, dx, dy);
}

/* Swap buffers (swap active render target).  */
grub_err_t
grub_video_swap_buffers (void)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->swap_buffers ();
}

/* Create new render target.  */
grub_err_t
grub_video_create_render_target (struct grub_video_render_target **result,
                                 unsigned int width, unsigned int height,
                                 unsigned int mode_type)
{
  *result = 0;
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->create_render_target (result,
                                                          width, height,
                                                          mode_type);
}

/* Delete render target.  */
grub_err_t
grub_video_delete_render_target (struct grub_video_render_target *target)
{
  if (!target)
    return GRUB_ERR_NONE;
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->delete_render_target (target);
}

/* Set active render target.  */
grub_err_t
grub_video_set_active_render_target (struct grub_video_render_target *target)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->set_active_render_target (target);
}

/* Get active render target.  */
grub_err_t
grub_video_get_active_render_target (struct grub_video_render_target **target)
{
  if (! grub_video_adapter_active)
    return grub_error (GRUB_ERR_BAD_DEVICE, "no video mode activated");

  return grub_video_adapter_active->get_active_render_target (target);
}

grub_err_t
grub_video_edid_checksum (struct grub_video_edid_info *edid_info)
{
  const char *edid_bytes = (const char *) edid_info;
  int i;
  char checksum = 0;

  /* Check EDID checksum.  */
  for (i = 0; i < 128; ++i)
    checksum += edid_bytes[i];

  if (checksum != 0)
    return grub_error (GRUB_ERR_BAD_DEVICE,
		       "invalid EDID checksum %d", checksum);

  grub_errno = GRUB_ERR_NONE;
  return grub_errno;
}

grub_err_t
grub_video_edid_preferred_mode (struct grub_video_edid_info *edid_info,
				unsigned int *width, unsigned int *height)
{
  /* Bit 1 in the Feature Support field indicates that the first
     Detailed Timing Description is the preferred timing mode.  */
  if (edid_info->version == 1 /* we don't understand later versions */
      && (edid_info->feature_support
	  & GRUB_VIDEO_EDID_FEATURE_PREFERRED_TIMING_MODE)
      && edid_info->detailed_timings[0].pixel_clock)
    {
      *width = edid_info->detailed_timings[0].horizontal_active_lo
	       | (((unsigned int)
		   (edid_info->detailed_timings[0].horizontal_hi & 0xf0))
		  << 4);
      *height = edid_info->detailed_timings[0].vertical_active_lo
		| (((unsigned int)
		    (edid_info->detailed_timings[0].vertical_hi & 0xf0))
		   << 4);
      if (*width && *height)
	return GRUB_ERR_NONE;
    }

  return grub_error (GRUB_ERR_BAD_DEVICE, "no preferred mode available");
}

/* Parse <width>x<height>[x<depth>]*/
static grub_err_t
parse_modespec (const char *current_mode, int *width, int *height, int *depth)
{
  const char *value;
  const char *param = current_mode;

  *width = *height = *depth = -1;

  if (grub_strcmp (param, "auto") == 0)
    {
      *width = *height = 0;
      return GRUB_ERR_NONE;
    }

  /* Find width value.  */
  value = param;
  param = grub_strchr(param, 'x');
  if (param == NULL)
    return grub_error (GRUB_ERR_BAD_ARGUMENT,
		       N_("invalid video mode specification `%s'"),
		       current_mode);

  param++;
  
  *width = grub_strtoul (value, 0, 0);
  if (grub_errno != GRUB_ERR_NONE)
      return grub_error (GRUB_ERR_BAD_ARGUMENT,
			 N_("invalid video mode specification `%s'"),
			 current_mode);
  
  /* Find height value.  */
  value = param;
  param = grub_strchr(param, 'x');
  if (param == NULL)
    {
      *height = grub_strtoul (value, 0, 0);
      if (grub_errno != GRUB_ERR_NONE)
	return grub_error (GRUB_ERR_BAD_ARGUMENT,
			   N_("invalid video mode specification `%s'"),
			   current_mode);
    }
  else
    {
      /* We have optional color depth value.  */
      param++;
      
      *height = grub_strtoul (value, 0, 0);
      if (grub_errno != GRUB_ERR_NONE)
	return grub_error (GRUB_ERR_BAD_ARGUMENT,
			   N_("invalid video mode specification `%s'"),
			   current_mode);
      
      /* Convert color depth value.  */
      value = param;
      *depth = grub_strtoul (value, 0, 0);
      if (grub_errno != GRUB_ERR_NONE)
	return grub_error (GRUB_ERR_BAD_ARGUMENT,
			   N_("invalid video mode specification `%s'"),
			   current_mode);
    }
  return GRUB_ERR_NONE;
}

grub_err_t
grub_video_set_mode (const char *modestring,
		     unsigned int modemask,
		     unsigned int modevalue)
{
  char *tmp;
  char *next_mode;
  char *current_mode;
  char *modevar;

  if (grub_video_adapter_active && grub_video_adapter_active->id == GRUB_VIDEO_ADAPTER_CAPTURE)
    return GRUB_ERR_NONE;

  modevalue &= modemask;

  /* Take copy of env.var. as we don't want to modify that.  */
  modevar = grub_strdup (modestring);

  /* Initialize next mode.  */
  next_mode = modevar;

  if (! modevar)
    return grub_errno;

  if (grub_memcmp (next_mode, "keep", sizeof ("keep")) == 0
      || grub_memcmp (next_mode, "keep,", sizeof ("keep,") - 1) == 0
      || grub_memcmp (next_mode, "keep;", sizeof ("keep;") - 1) == 0)
    {
      int suitable = 1;
      grub_err_t err;

      if (grub_video_adapter_active)
	{
	  struct grub_video_mode_info mode_info;
	  grub_memset (&mode_info, 0, sizeof (mode_info));
	  err = grub_video_get_info (&mode_info);
	  if (err)
	    {
	      suitable = 0;
	      grub_errno = GRUB_ERR_NONE;
	    }
	  if ((mode_info.mode_type & modemask) != modevalue)
	    suitable = 0;
	}
      else if (((GRUB_VIDEO_MODE_TYPE_PURE_TEXT & modemask) != 0)
	       && ((GRUB_VIDEO_MODE_TYPE_PURE_TEXT & modevalue) == 0))
	suitable = 0;

      if (suitable)
	{
	  grub_free (modevar);
	  return GRUB_ERR_NONE;
	}
      next_mode += sizeof ("keep") - 1;
      if (! *next_mode)
	{
	  grub_free (modevar);

	  /* TRANSLATORS: This doesn't imply that there is no available video
	     mode at all. All modes may have been filtered out by some criteria.
	   */
	  return grub_error (GRUB_ERR_BAD_ARGUMENT,
			     N_("no suitable video mode found"));
	}

      /* Skip separator. */
      next_mode++;
    }

  /* De-activate last set video adapter.  */
  if (grub_video_adapter_active)
    {
      /* Finalize adapter.  */
      grub_video_adapter_active->fini ();
      if (grub_errno != GRUB_ERR_NONE)
	grub_errno = GRUB_ERR_NONE;

      /* Mark active adapter as not set.  */
      grub_video_adapter_active = 0;
    }

  /* Loop until all modes has been tested out.  */
  while (next_mode != NULL)
    {
      int width = -1;
      int height = -1;
      int depth = -1;
      grub_err_t err;
      unsigned int flags = modevalue;
      unsigned int flagmask = modemask;

      /* Use last next_mode as current mode.  */
      tmp = next_mode;

      /* Save position of next mode and separate modes.  */
      for (; *next_mode; next_mode++)
	if (*next_mode == ',' || *next_mode == ';')
	  break;
      if (*next_mode)
	{
	  *next_mode = 0;
	  next_mode++;
	}
      else
	next_mode = 0;

      /* Skip whitespace.  */
      while (grub_isspace (*tmp))
	tmp++;

      /* Initialize token holders.  */
      current_mode = tmp;

      /* XXX: we assume that we're in pure text mode if
	 no video mode is initialized. Is it always true? */
      if (grub_strcmp (current_mode, "text") == 0)
	{
	  struct grub_video_mode_info mode_info;

	  grub_memset (&mode_info, 0, sizeof (mode_info));
	  if (((GRUB_VIDEO_MODE_TYPE_PURE_TEXT & modemask) == 0)
	      || ((GRUB_VIDEO_MODE_TYPE_PURE_TEXT & modevalue) != 0))
	    {
	      /* Valid mode found from adapter, and it has been activated.
		 Specify it as active adapter.  */
	      grub_video_adapter_active = NULL;

	      /* Free memory.  */
	      grub_free (modevar);

	      return GRUB_ERR_NONE;
	    }
	  else
	    continue;
	}

      err = parse_modespec (current_mode, &width, &height, &depth);
      if (err)
	{
	  /* Free memory before returning.  */
	  grub_free (modevar);

	  return err;
	}

      /* Try out video mode.  */

      /* If user requested specific depth check if this depth is supported.  */
      if (depth != -1 && (flagmask & GRUB_VIDEO_MODE_TYPE_DEPTH_MASK)
	  &&
	  (((flags & GRUB_VIDEO_MODE_TYPE_DEPTH_MASK)
	    != ((depth << GRUB_VIDEO_MODE_TYPE_DEPTH_POS)
		& GRUB_VIDEO_MODE_TYPE_DEPTH_MASK))))
	continue;

      if (depth != -1)
	{
	  flags |= (depth << GRUB_VIDEO_MODE_TYPE_DEPTH_POS)
	    & GRUB_VIDEO_MODE_TYPE_DEPTH_MASK;
	  flagmask |= GRUB_VIDEO_MODE_TYPE_DEPTH_MASK;
	}

      /* Try to initialize requested mode.  Ignore any errors.  */
      grub_video_adapter_t p;

      /* Loop thru all possible video adapter trying to find requested mode.  */
      for (p = grub_video_adapter_list; p; p = p->next)
	{
	  struct grub_video_mode_info mode_info;

	  grub_memset (&mode_info, 0, sizeof (mode_info));

	  /* Try to initialize adapter, if it fails, skip to next adapter.  */
	  err = p->init ();
	  if (err != GRUB_ERR_NONE)
	    {
	      grub_errno = GRUB_ERR_NONE;
	      continue;
	    }

	  /* Try to initialize video mode.  */
	  err = p->setup (width, height, flags, flagmask);
	  if (err != GRUB_ERR_NONE)
	    {
	      p->fini ();
	      grub_errno = GRUB_ERR_NONE;
	      continue;
	    }

	  err = p->get_info (&mode_info);
	  if (err != GRUB_ERR_NONE)
	    {
	      p->fini ();
	      grub_errno = GRUB_ERR_NONE;
	      continue;
	    }

	  flags = mode_info.mode_type & ~GRUB_VIDEO_MODE_TYPE_DEPTH_MASK;
	  flags |= (mode_info.bpp << GRUB_VIDEO_MODE_TYPE_DEPTH_POS)
	    & GRUB_VIDEO_MODE_TYPE_DEPTH_MASK;

	  /* Check that mode is suitable for upper layer.  */
	  if ((flags & GRUB_VIDEO_MODE_TYPE_PURE_TEXT)
	      ? (((GRUB_VIDEO_MODE_TYPE_PURE_TEXT & modemask) != 0)
		 && ((GRUB_VIDEO_MODE_TYPE_PURE_TEXT & modevalue) == 0))
	      : ((flags & modemask) != modevalue))
	    {
	      p->fini ();
	      grub_errno = GRUB_ERR_NONE;
	      continue;
	    }

	  /* Valid mode found from adapter, and it has been activated.
	     Specify it as active adapter.  */
	  grub_video_adapter_active = p;

	  /* Free memory.  */
	  grub_free (modevar);

	  return GRUB_ERR_NONE;
	}

    }

  /* Free memory.  */
  grub_free (modevar);

  return grub_error (GRUB_ERR_BAD_ARGUMENT,
		     N_("no suitable video mode found"));
}