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/*
* epsonds-jpeg.c - Epson ESC/I-2 driver, JPEG support.
*
* Copyright (C) 2015 Tower Technologies
* Author: Alessandro Zummo <a.zummo@towertech.it>
*
* This file is part of the SANE package.
*
* This program 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, version 2.
*/
#define DEBUG_DECLARE_ONLY
#include "sane/config.h"
#include <math.h>
#include "epsonds.h"
#include "epsonds-jpeg.h"
#include "epsonds-ops.h"
#define min(A,B) (((A)<(B)) ? (A) : (B))
typedef struct
{
struct jpeg_source_mgr pub;
epsonds_scanner *s;
JOCTET *buffer;
SANE_Byte *linebuffer;
SANE_Int linebuffer_size;
SANE_Int linebuffer_index;
}
epsonds_src_mgr;
METHODDEF(void)
jpeg_init_source(j_decompress_ptr __sane_unused__ cinfo)
{
}
METHODDEF(void)
jpeg_term_source(j_decompress_ptr __sane_unused__ cinfo)
{
}
METHODDEF(boolean)
jpeg_fill_input_buffer(j_decompress_ptr cinfo)
{
epsonds_src_mgr *src = (epsonds_src_mgr *)cinfo->src;
int avail, size;
/* read from the scanner or the ring buffer */
avail = eds_ring_avail(src->s->current);
if (avail == 0) {
return FALSE;
}
/* read from scanner if no data? */
size = min(1024, avail);
eds_ring_read(src->s->current, src->buffer, size);
src->pub.next_input_byte = src->buffer;
src->pub.bytes_in_buffer = size;
return TRUE;
}
METHODDEF (void)
jpeg_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
epsonds_src_mgr *src = (epsonds_src_mgr *)cinfo->src;
if (num_bytes > 0) {
while (num_bytes > (long)src->pub.bytes_in_buffer) {
num_bytes -= (long)src->pub.bytes_in_buffer;
jpeg_fill_input_buffer(cinfo);
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
SANE_Status
eds_jpeg_start(epsonds_scanner *s)
{
epsonds_src_mgr *src;
s->jpeg_cinfo.err = jpeg_std_error(&s->jpeg_err);
jpeg_create_decompress(&s->jpeg_cinfo);
s->jpeg_cinfo.src = (struct jpeg_source_mgr *)(*s->jpeg_cinfo.mem->alloc_small)((j_common_ptr)&s->jpeg_cinfo,
JPOOL_PERMANENT, sizeof(epsonds_src_mgr));
memset(s->jpeg_cinfo.src, 0x00, sizeof(epsonds_src_mgr));
src = (epsonds_src_mgr *)s->jpeg_cinfo.src;
src->s = s;
src->buffer = (JOCTET *)(*s->jpeg_cinfo.mem->alloc_small)((j_common_ptr)&s->jpeg_cinfo,
JPOOL_PERMANENT,
1024 * sizeof(JOCTET));
src->pub.init_source = jpeg_init_source;
src->pub.fill_input_buffer = jpeg_fill_input_buffer;
src->pub.skip_input_data = jpeg_skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart;
src->pub.term_source = jpeg_term_source;
src->pub.bytes_in_buffer = 0;
src->pub.next_input_byte = NULL;
s->jpeg_header_seen = 0;
return SANE_STATUS_GOOD;
}
SANE_Status
eds_jpeg_read_header(epsonds_scanner *s)
{
epsonds_src_mgr *src = (epsonds_src_mgr *)s->jpeg_cinfo.src;
if (jpeg_read_header(&s->jpeg_cinfo, TRUE)) {
s->jdst = sanei_jpeg_jinit_write_ppm(&s->jpeg_cinfo);
if (jpeg_start_decompress(&s->jpeg_cinfo)) {
int size;
DBG(3, "%s: w: %d, h: %d, components: %d\n",
__func__,
s->jpeg_cinfo.output_width, s->jpeg_cinfo.output_height,
s->jpeg_cinfo.output_components);
size = s->jpeg_cinfo.output_width * s->jpeg_cinfo.output_components * 1;
src->linebuffer = (*s->jpeg_cinfo.mem->alloc_large)((j_common_ptr)&s->jpeg_cinfo,
JPOOL_PERMANENT, size);
src->linebuffer_size = 0;
src->linebuffer_index = 0;
s->jpeg_header_seen = 1;
return SANE_STATUS_GOOD;
} else {
DBG(0, "%s: decompression failed\n", __func__);
return SANE_STATUS_IO_ERROR;
}
} else {
DBG(0, "%s: cannot read JPEG header\n", __func__);
return SANE_STATUS_IO_ERROR;
}
}
void
eds_jpeg_finish(epsonds_scanner *s)
{
jpeg_destroy_decompress(&s->jpeg_cinfo);
}
void
eds_jpeg_read(SANE_Handle handle, SANE_Byte *data,
SANE_Int max_length, SANE_Int *length)
{
epsonds_scanner *s = handle;
struct jpeg_decompress_struct cinfo = s->jpeg_cinfo;
epsonds_src_mgr *src = (epsonds_src_mgr *)s->jpeg_cinfo.src;
int l;
*length = 0;
/* copy from line buffer if available */
if (src->linebuffer_size && src->linebuffer_index < src->linebuffer_size) {
*length = src->linebuffer_size - src->linebuffer_index;
if (*length > max_length)
*length = max_length;
memcpy(data, src->linebuffer + src->linebuffer_index, *length);
src->linebuffer_index += *length;
return;
}
if (cinfo.output_scanline >= cinfo.output_height) {
*length = 0;
return;
}
/* scanlines of decompressed data will be in s->jdst->buffer
* only one line at time is supported
*/
l = jpeg_read_scanlines(&cinfo, s->jdst->buffer, 1);
if (l == 0) {
return;
}
/* from s->jdst->buffer to linebuffer
* linebuffer holds width * bytesperpixel
*/
(*s->jdst->put_pixel_rows)(&cinfo, s->jdst, 1, (char *)src->linebuffer);
*length = cinfo.output_width * cinfo.output_components * 1;
src->linebuffer_size = *length;
src->linebuffer_index = 0;
if (*length > max_length)
*length = max_length;
memcpy(data, src->linebuffer + src->linebuffer_index, *length);
src->linebuffer_index += *length;
}
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