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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007 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/bitmap.h>
#include <grub/types.h>
#include <grub/dl.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/i18n.h>
#include <grub/safemath.h>
GRUB_MOD_LICENSE ("GPLv3+");
/* List of bitmap readers registered to system. */
static grub_video_bitmap_reader_t bitmap_readers_list;
/* Register bitmap reader. */
void
grub_video_bitmap_reader_register (grub_video_bitmap_reader_t reader)
{
reader->next = bitmap_readers_list;
bitmap_readers_list = reader;
}
/* Unregister bitmap reader. */
void
grub_video_bitmap_reader_unregister (grub_video_bitmap_reader_t reader)
{
grub_video_bitmap_reader_t *p, q;
for (p = &bitmap_readers_list, q = *p; q; p = &(q->next), q = q->next)
if (q == reader)
{
*p = q->next;
break;
}
}
/* Creates new bitmap, saves created bitmap on success to *bitmap. */
grub_err_t
grub_video_bitmap_create (struct grub_video_bitmap **bitmap,
unsigned int width, unsigned int height,
enum grub_video_blit_format blit_format)
{
struct grub_video_mode_info *mode_info;
grub_size_t size;
if (!bitmap)
return grub_error (GRUB_ERR_BUG, "invalid argument");
*bitmap = 0;
if (width == 0 || height == 0)
return grub_error (GRUB_ERR_BUG, "invalid argument");
*bitmap = (struct grub_video_bitmap *)grub_malloc (sizeof (struct grub_video_bitmap));
if (! *bitmap)
return grub_errno;
mode_info = &((*bitmap)->mode_info);
/* Populate mode_info. */
mode_info->width = width;
mode_info->height = height;
mode_info->blit_format = blit_format;
switch (blit_format)
{
case GRUB_VIDEO_BLIT_FORMAT_RGBA_8888:
mode_info->mode_type = GRUB_VIDEO_MODE_TYPE_RGB
| GRUB_VIDEO_MODE_TYPE_ALPHA;
mode_info->bpp = 32;
mode_info->bytes_per_pixel = 4;
mode_info->number_of_colors = 256;
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;
mode_info->reserved_mask_size = 8;
mode_info->reserved_field_pos = 24;
break;
case GRUB_VIDEO_BLIT_FORMAT_RGB_888:
mode_info->mode_type = GRUB_VIDEO_MODE_TYPE_RGB;
mode_info->bpp = 24;
mode_info->bytes_per_pixel = 3;
mode_info->number_of_colors = 256;
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;
mode_info->reserved_mask_size = 0;
mode_info->reserved_field_pos = 0;
break;
case GRUB_VIDEO_BLIT_FORMAT_INDEXCOLOR:
mode_info->mode_type = GRUB_VIDEO_MODE_TYPE_INDEX_COLOR;
mode_info->bpp = 8;
mode_info->bytes_per_pixel = 1;
mode_info->number_of_colors = 256;
mode_info->red_mask_size = 0;
mode_info->red_field_pos = 0;
mode_info->green_mask_size = 0;
mode_info->green_field_pos = 0;
mode_info->blue_mask_size = 0;
mode_info->blue_field_pos = 0;
mode_info->reserved_mask_size = 0;
mode_info->reserved_field_pos = 0;
break;
default:
grub_free (*bitmap);
*bitmap = 0;
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"unsupported bitmap format");
}
mode_info->pitch = width * mode_info->bytes_per_pixel;
/* Calculate size needed for the data. */
if (grub_mul (width, mode_info->bytes_per_pixel, &size) ||
grub_mul (size, height, &size))
{
grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
goto fail;
}
(*bitmap)->data = grub_zalloc (size);
if (! (*bitmap)->data)
goto fail;
return GRUB_ERR_NONE;
fail:
grub_free (*bitmap);
*bitmap = NULL;
return grub_errno;
}
/* Frees all resources allocated by bitmap. */
grub_err_t
grub_video_bitmap_destroy (struct grub_video_bitmap *bitmap)
{
if (! bitmap)
return GRUB_ERR_NONE;
grub_free (bitmap->data);
grub_free (bitmap);
return GRUB_ERR_NONE;
}
/* Match extension to filename. */
static int
match_extension (const char *filename, const char *ext)
{
int pos;
int ext_len;
pos = grub_strlen (filename);
ext_len = grub_strlen (ext);
if (! pos || ! ext_len || ext_len > pos)
return 0;
pos -= ext_len;
return grub_strcasecmp (filename + pos, ext) == 0;
}
/* Loads bitmap using registered bitmap readers. */
grub_err_t
grub_video_bitmap_load (struct grub_video_bitmap **bitmap,
const char *filename)
{
grub_video_bitmap_reader_t reader = bitmap_readers_list;
if (!bitmap)
return grub_error (GRUB_ERR_BUG, "invalid argument");
*bitmap = 0;
while (reader)
{
if (match_extension (filename, reader->extension))
return reader->reader (bitmap, filename);
reader = reader->next;
}
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
/* TRANSLATORS: We're speaking about bitmap images like
JPEG or PNG. */
N_("bitmap file `%s' is of"
" unsupported format"), filename);
}
/* Return mode info for bitmap. */
void grub_video_bitmap_get_mode_info (struct grub_video_bitmap *bitmap,
struct grub_video_mode_info *mode_info)
{
if (!bitmap)
return;
*mode_info = bitmap->mode_info;
}
/* Return pointer to bitmap's raw data. */
void *grub_video_bitmap_get_data (struct grub_video_bitmap *bitmap)
{
if (!bitmap)
return 0;
return bitmap->data;
}
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