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* grub-core/video/readers/jpeg.c: Support grayscale.

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2013-09-27 11:13:36 +02:00
parent 0340bdbc22
commit e9c492a02e
2 changed files with 52 additions and 26 deletions
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4
ChangeLog
View file

@ -1,3 +1,7 @@
2013-09-24 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/video/readers/jpeg.c: Support grayscale.
2013-09-24 Jon McCune <jonmccune@google.com>
* grub-core/commands/loadenv.c: Support skipping signature check

74
grub-core/video/readers/jpeg.c
View file

@ -33,21 +33,24 @@ GRUB_MOD_LICENSE ("GPLv3+");
#define JPEG_SAMPLING_1x1 0x11
#define JPEG_MARKER_SOI 0xd8
#define JPEG_MARKER_EOI 0xd9
#define JPEG_MARKER_DHT 0xc4
#define JPEG_MARKER_DQT 0xdb
#define JPEG_MARKER_SOF0 0xc0
#define JPEG_MARKER_SOS 0xda
#define JPEG_MARKER_DRI 0xdd
#define JPEG_MARKER_RST0 0xd0
#define JPEG_MARKER_RST1 0xd1
#define JPEG_MARKER_RST2 0xd2
#define JPEG_MARKER_RST3 0xd3
#define JPEG_MARKER_RST4 0xd4
#define JPEG_MARKER_RST5 0xd5
#define JPEG_MARKER_RST6 0xd6
#define JPEG_MARKER_RST7 0xd7
enum
{
JPEG_MARKER_SOF0 = 0xc0,
JPEG_MARKER_DHT = 0xc4,
JPEG_MARKER_SOI = 0xd8,
JPEG_MARKER_EOI = 0xd9,
JPEG_MARKER_RST0 = 0xd0,
JPEG_MARKER_RST1 = 0xd1,
JPEG_MARKER_RST2 = 0xd2,
JPEG_MARKER_RST3 = 0xd3,
JPEG_MARKER_RST4 = 0xd4,
JPEG_MARKER_RST5 = 0xd5,
JPEG_MARKER_RST6 = 0xd6,
JPEG_MARKER_RST7 = 0xd7,
JPEG_MARKER_SOS = 0xda,
JPEG_MARKER_DQT = 0xdb,
JPEG_MARKER_DRI = 0xdd,
};
#define SHIFT_BITS 8
#define CONST(x) ((int) ((x) * (1L << SHIFT_BITS) + 0.5))
@ -97,6 +100,8 @@ struct grub_jpeg_data
int dc_value[3];
int color_components;
int bit_mask, bit_save;
};
@ -294,9 +299,10 @@ grub_jpeg_decode_sof (struct grub_jpeg_data *data)
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: invalid image size");
cc = grub_jpeg_get_byte (data);
if (cc != 3)
if (cc != 1 && cc != 3)
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"jpeg: component count must be 3");
"jpeg: component count must be 1 or 3");
data->color_components = cc;
for (i = 0; i < cc; i++)
{
@ -571,9 +577,10 @@ grub_jpeg_decode_sos (struct grub_jpeg_data *data)
cc = grub_jpeg_get_byte (data);
if (cc != 3)
if (cc != 3 && cc != 1)
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"jpeg: component count must be 3");
"jpeg: component count must be 1 or 3");
data->color_components = cc;
for (i = 0; i < cc; i++)
{
@ -626,8 +633,13 @@ grub_jpeg_decode_data (struct grub_jpeg_data *data)
for (c2 = 0; c2 < data->hs; c2++)
grub_jpeg_decode_du (data, 0, data->ydu[r2 * 2 + c2]);
grub_jpeg_decode_du (data, 1, data->cbdu);
grub_jpeg_decode_du (data, 2, data->crdu);
if (data->color_components >= 3)
{
grub_jpeg_decode_du (data, 1, data->cbdu);
grub_jpeg_decode_du (data, 2, data->crdu);
}
grub_memset (&data->cbdu, 0, sizeof (data->cbdu));
grub_memset (&data->crdu, 0, sizeof (data->crdu));
if (grub_errno)
return grub_errno;
@ -639,14 +651,24 @@ grub_jpeg_decode_data (struct grub_jpeg_data *data)
for (r2 = 0; r2 < nr2; r2++, ptr2 += (data->image_width - nc2) * 3)
for (c2 = 0; c2 < nc2; c2++, ptr2 += 3)
{
int i0, yy, cr, cb;
int i0, yy;
i0 = (r2 / data->vs) * 8 + (c2 / data->hs);
cr = data->crdu[i0];
cb = data->cbdu[i0];
yy = data->ydu[(r2 / 8) * 2 + (c2 / 8)][(r2 % 8) * 8 + (c2 % 8)];
grub_jpeg_ycrcb_to_rgb (yy, cr, cb, ptr2);
if (data->color_components >= 3)
{
int cr, cb;
cr = data->crdu[i0];
cb = data->cbdu[i0];
grub_jpeg_ycrcb_to_rgb (yy, cr, cb, ptr2);
}
else
{
ptr2[0] = yy;
ptr2[1] = yy;
ptr2[2] = yy;
}
}
}
@ -778,7 +800,7 @@ grub_video_reader_jpeg (struct grub_video_bitmap **bitmap,
#if defined(JPEG_DEBUG)
static grub_err_t
grub_cmd_jpegtest (grub_command_t cmd __attribute__ ((unused)),
grub_cmd_jpegtest (grub_command_t cmdd __attribute__ ((unused)),
int argc, char **args)
{
struct grub_video_bitmap *bitmap = 0;