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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"
#include <setjmp.h>
struct my_error_mgr {
struct jpeg_error_mgr pub;
jmp_buf setjmp_buffer;
};
typedef struct my_error_mgr * my_error_ptr;
METHODDEF(void) my_error_exit (j_common_ptr cinfo)
{
char buffer[JMSG_LENGTH_MAX];
(*cinfo->err->format_message) (cinfo, buffer);
DBG(10,"Jpeg decode error [%s]", buffer);
}
LOCAL(struct jpeg_error_mgr *) jpeg_custom_error (struct my_error_mgr * err)
{
struct jpeg_error_mgr* pRet = jpeg_std_error(&(err->pub));
err->pub.error_exit = my_error_exit;
return pRet;
}
typedef struct
{
struct jpeg_source_mgr pub;
JOCTET *buffer;
int length;
}
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;
/* read from scanner if no data? */
src->pub.next_input_byte = src->buffer;
src->pub.bytes_in_buffer = src->length;
DBG(18, "reading from ring buffer, %d left\n", src->length);
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;
}
}
void eds_decode_jpeg(epsonds_scanner*s, SANE_Byte *data, SANE_Int size, ring_buffer* ringBuffer, SANE_Int isBackSide, SANE_Int needToConvertBW)
{
struct jpeg_decompress_struct jpeg_cinfo;
struct my_error_mgr jpeg_err;
{
epsonds_src_mgr *src;
jpeg_cinfo.err = jpeg_custom_error(&jpeg_err);
jpeg_create_decompress(&jpeg_cinfo);
jpeg_cinfo.src = (struct jpeg_source_mgr *)(*jpeg_cinfo.mem->alloc_small)((j_common_ptr)&jpeg_cinfo,
JPOOL_PERMANENT, sizeof(epsonds_src_mgr));
memset(jpeg_cinfo.src, 0x00, sizeof(epsonds_src_mgr));
;
src = (epsonds_src_mgr *)jpeg_cinfo.src;
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;
src->buffer = (JOCTET*)data;
src->length = size;
}
{
if (jpeg_read_header(&jpeg_cinfo, TRUE)) {
if (jpeg_start_decompress(&jpeg_cinfo)) {
DBG(10,"%s: w: %d, h: %d, components: %d\n",
__func__,
jpeg_cinfo.output_width, jpeg_cinfo.output_height,
jpeg_cinfo.output_components);
}
}
}
{
int sum = 0;
int bufSize = jpeg_cinfo.output_width * jpeg_cinfo.output_components;
int monoBufSize = (jpeg_cinfo.output_width + 7)/8;
JSAMPARRAY scanlines = (jpeg_cinfo.mem->alloc_sarray)((j_common_ptr)&jpeg_cinfo, JPOOL_IMAGE, bufSize, 1);
while (jpeg_cinfo.output_scanline < jpeg_cinfo.output_height) {
int l = jpeg_read_scanlines(&jpeg_cinfo, scanlines, 1);
if (l == 0) {
break;
}
sum += l;
if (needToConvertBW)
{
SANE_Byte* bytes = scanlines[0];
SANE_Int imgPos = 0;
for (int i = 0; i < monoBufSize; i++)
{
SANE_Byte outByte = 0;
for(SANE_Int bitIndex = 0; bitIndex < 8 && imgPos < bufSize; bitIndex++) {
//DBG(10,"bytes[imgPos] = %d\n", bytes[imgPos]);
if(bytes[imgPos] >= 110) {
SANE_Byte bit = 7 - (bitIndex % 8);
outByte |= (1<< bit);
}
imgPos += 1;
}
//DBG(10,"outByte = %d\n", outByte);
eds_ring_write(ringBuffer, &outByte, 1);
}
}
else
{
eds_ring_write(ringBuffer, scanlines[0], bufSize);
}
// decode until valida data
if (isBackSide)
{
if (sum >= s->height_back)
{
break;
}
}else
{
if (sum >= s->height_front)
{
break;
}
}
}
DBG(10,"decodded lines = %d\n", sum);
// abandon unncessary data
if ((JDIMENSION)sum < jpeg_cinfo.output_height)
{
// unncessary data
while(1)
{
int l = jpeg_read_scanlines(&jpeg_cinfo, scanlines, 1);
if (l == 0)
{
break;
}
}
}
// if not auto crop mode padding to lines
if (s->val[OPT_ADF_CRP].w == 0)
{
unsigned char* padding = malloc(s->params.bytes_per_line);
memset(padding, 255, s->params.bytes_per_line);
DBG(10,"padding data lines = %d to %d pa \n", sum, s->params.lines);
while(sum < s->params.lines)
{
eds_ring_write(ringBuffer, padding, bufSize);
sum++;
}
free(padding);
padding = NULL;
}
}
{
jpeg_finish_decompress(&jpeg_cinfo);
jpeg_destroy_decompress(&jpeg_cinfo);
}
return;
}
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