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/*
* Small jpeg decoder library
*
* Copyright (c) 2006, Luc Saillard <luc@saillard.org>
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of the author nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "tinyjpeg.h"
#include "tinyjpeg-internal.h"
/**
* YCrCb -> Grey (1x1, 1x2)
* .---.
* | 1 |
* `---'
*/
static void YCrCB_to_Grey_1xN(struct jdec_private *priv, int sx, int sy)
{
const unsigned char *y;
unsigned char *p;
unsigned int i;
int offset_to_next_row;
p = priv->plane[0];
y = priv->Y;
offset_to_next_row = priv->bytes_per_row[0];
for (i = sy; i > 0; i--) {
memcpy(p, y, sx);
y += 8;
p += offset_to_next_row;
}
}
/**
* YCrCb -> Grey (2x1, 2x2)
* .-------.
* | 1 | 2 |
* `-------'
*/
static void YCrCB_to_Grey_2xN(struct jdec_private *priv, int sx, int sy)
{
const unsigned char *y;
unsigned char *p;
unsigned int i;
int offset_to_next_row;
p = priv->plane[0];
y = priv->Y;
offset_to_next_row = priv->bytes_per_row[0];
for (i = sy; i > 0; i--) {
memcpy(p, y, sx);
y += 16;
p += offset_to_next_row;
}
}
static int initialize_grey(struct jdec_private *priv,
unsigned int *bytes_per_blocklines,
unsigned int *bytes_per_mcu)
{
if (!priv->bytes_per_row[0])
priv->bytes_per_row[0] = priv->width;
if (!priv->components[0])
priv->components[0] = malloc(priv->height * priv->bytes_per_row[0]);
bytes_per_blocklines[0] = priv->bytes_per_row[0] << 3;
bytes_per_mcu[0] = 8;
return !priv->components[0];
}
static const struct tinyjpeg_colorspace format_grey =
{
{
YCrCB_to_Grey_1xN,
YCrCB_to_Grey_1xN,
YCrCB_to_Grey_2xN,
YCrCB_to_Grey_2xN,
},
tinyjpeg_decode_mcu_1comp_table,
initialize_grey
};
const tinyjpeg_colorspace_t TINYJPEG_FMT_GREY = &format_grey;
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