static grub_err_t
grub_video_reader_tga (struct grub_video_bitmap **bitmap,
const char *filename)
{
grub_file_t file;
grub_ssize_t pos;
struct grub_tga_header header;
int has_alpha;
file = grub_buffile_open (filename, 0);
if (! file)
return grub_errno;
/* TGA Specification states that we SHOULD start by reading
ID from end of file, but we really don't care about that as we are
not going to support developer area & extensions at this point. */
/* Read TGA header from beginning of file. */
if (grub_file_read (file, &header, sizeof (header))
!= sizeof (header))
{
grub_file_close (file);
return grub_errno;
}
/* Skip ID field. */
pos = grub_file_tell (file);
pos += header.id_length;
grub_file_seek (file, pos);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (file);
return grub_errno;
}
#if defined(TGA_DEBUG)
grub_printf("tga: header\n");
dump_int_field(header.id_length);
dump_int_field(header.color_map_type);
dump_int_field(header.image_type);
dump_int_field(header.color_map_first_index);
dump_int_field(header.color_map_length);
dump_int_field(header.color_map_bpp);
dump_int_field(header.image_x_origin);
dump_int_field(header.image_y_origin);
dump_int_field(header.image_width);
dump_int_field(header.image_height);
dump_int_field(header.image_bpp);
dump_int_field(header.image_descriptor);
#endif
/* Check that bitmap encoding is supported. */
switch (header.image_type)
{
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_TRUECOLOR:
case GRUB_TGA_IMAGE_TYPE_RLE_TRUECOLOR:
break;
default:
grub_file_close (file);
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"unsupported bitmap format (unknown encoding)");
}
/* Check that bitmap depth is supported. */
switch (header.image_bpp)
{
case 24:
has_alpha = 0;
break;
case 32:
has_alpha = 1;
break;
default:
grub_file_close (file);
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"unsupported bitmap format (bpp=%d)",
header.image_bpp);
}
/* Allocate bitmap. If there is alpha information store it too. */
if (has_alpha)
{
grub_video_bitmap_create (bitmap, header.image_width,
header.image_height,
GRUB_VIDEO_BLIT_FORMAT_RGBA_8888);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (file);
return grub_errno;
}
/* Load bitmap data. */
switch (header.image_type)
{
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_TRUECOLOR:
tga_load_truecolor_R8G8B8A8 (*bitmap, &header, file);
break;
case GRUB_TGA_IMAGE_TYPE_RLE_TRUECOLOR:
tga_load_truecolor_rle_R8G8B8A8 (*bitmap, &header, file);
break;
}
}
else
{
grub_video_bitmap_create (bitmap, header.image_width,
header.image_height,
GRUB_VIDEO_BLIT_FORMAT_RGB_888);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (file);
return grub_errno;
}
/* Load bitmap data. */
switch (header.image_type)
{
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_TRUECOLOR:
tga_load_truecolor_R8G8B8 (*bitmap, &header, file);
break;
case GRUB_TGA_IMAGE_TYPE_RLE_TRUECOLOR:
tga_load_truecolor_rle_R8G8B8 (*bitmap, &header, file);
break;
}
}
/* If there was a loading problem, destroy bitmap. */
if (grub_errno != GRUB_ERR_NONE)
{
grub_video_bitmap_destroy (*bitmap);
*bitmap = 0;
}
grub_file_close (file);
return grub_errno;
}
static grub_err_t
grub_video_reader_tga (struct grub_video_bitmap **bitmap,
const char *filename)
{
grub_ssize_t pos;
struct tga_data data;
grub_memset (&data, 0, sizeof (data));
data.file = grub_buffile_open (filename, 0);
if (! data.file)
return grub_errno;
/* TGA Specification states that we SHOULD start by reading
ID from end of file, but we really don't care about that as we are
not going to support developer area & extensions at this point. */
/* Read TGA header from beginning of file. */
if (grub_file_read (data.file, &data.hdr, sizeof (data.hdr))
!= sizeof (data.hdr))
{
grub_file_close (data.file);
return grub_errno;
}
/* Skip ID field. */
pos = grub_file_tell (data.file);
pos += data.hdr.id_length;
grub_file_seek (data.file, pos);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (data.file);
return grub_errno;
}
grub_dprintf("tga", "tga: header\n");
dump_int_field(data.hdr.id_length);
dump_int_field(data.hdr.color_map_type);
dump_int_field(data.hdr.image_type);
dump_int_field(data.hdr.color_map_first_index);
dump_int_field(data.hdr.color_map_length);
dump_int_field(data.hdr.color_map_bpp);
dump_int_field(data.hdr.image_x_origin);
dump_int_field(data.hdr.image_y_origin);
dump_int_field(data.hdr.image_width);
dump_int_field(data.hdr.image_height);
dump_int_field(data.hdr.image_bpp);
dump_int_field(data.hdr.image_descriptor);
data.image_width = grub_le_to_cpu16 (data.hdr.image_width);
data.image_height = grub_le_to_cpu16 (data.hdr.image_height);
/* Check that bitmap encoding is supported. */
switch (data.hdr.image_type)
{
case GRUB_TGA_IMAGE_TYPE_RLE_TRUECOLOR:
case GRUB_TGA_IMAGE_TYPE_RLE_BLACK_AND_WHITE:
case GRUB_TGA_IMAGE_TYPE_RLE_INDEXCOLOR:
data.uses_rle = 1;
break;
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_TRUECOLOR:
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_BLACK_AND_WHITE:
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_INDEXCOLOR:
data.uses_rle = 0;
break;
default:
grub_file_close (data.file);
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"unsupported bitmap format (unknown encoding %d)", data.hdr.image_type);
}
data.bpp = data.hdr.image_bpp / 8;
/* Check that bitmap depth is supported. */
switch (data.hdr.image_type)
{
case GRUB_TGA_IMAGE_TYPE_RLE_BLACK_AND_WHITE:
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_BLACK_AND_WHITE:
if (data.hdr.image_bpp != 8)
{
grub_file_close (data.file);
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"unsupported bitmap format (bpp=%d)",
data.hdr.image_bpp);
}
grub_video_bitmap_create (bitmap, data.image_width,
data.image_height,
GRUB_VIDEO_BLIT_FORMAT_RGB_888);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (data.file);
return grub_errno;
}
data.bitmap = *bitmap;
/* Load bitmap data. */
tga_load_grayscale (&data);
break;
case GRUB_TGA_IMAGE_TYPE_RLE_INDEXCOLOR:
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_INDEXCOLOR:
if (data.hdr.image_bpp != 8
|| data.hdr.color_map_bpp != 24
|| data.hdr.color_map_first_index != 0)
{
grub_file_close (data.file);
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"unsupported bitmap format (bpp=%d)",
data.hdr.image_bpp);
}
grub_video_bitmap_create (bitmap, data.image_width,
data.image_height,
GRUB_VIDEO_BLIT_FORMAT_RGB_888);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (data.file);
return grub_errno;
}
data.bitmap = *bitmap;
/* Load bitmap data. */
tga_load_palette (&data);
tga_load_index_color (&data);
break;
case GRUB_TGA_IMAGE_TYPE_RLE_TRUECOLOR:
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_TRUECOLOR:
switch (data.hdr.image_bpp)
{
case 24:
grub_video_bitmap_create (bitmap, data.image_width,
data.image_height,
GRUB_VIDEO_BLIT_FORMAT_RGB_888);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (data.file);
return grub_errno;
}
data.bitmap = *bitmap;
/* Load bitmap data. */
tga_load_truecolor_R8G8B8 (&data);
break;
case 32:
grub_video_bitmap_create (bitmap, data.image_width,
data.image_height,
GRUB_VIDEO_BLIT_FORMAT_RGBA_8888);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (data.file);
return grub_errno;
}
data.bitmap = *bitmap;
/* Load bitmap data. */
tga_load_truecolor_R8G8B8A8 (&data);
break;
default:
grub_file_close (data.file);
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"unsupported bitmap format (bpp=%d)",
data.hdr.image_bpp);
}
}
/* If there was a loading problem, destroy bitmap. */
if (grub_errno != GRUB_ERR_NONE)
{
grub_video_bitmap_destroy (*bitmap);
*bitmap = 0;
}
grub_file_close (data.file);
return grub_errno;
}
