From cfd27ef2ad8b005fd47ab41ef29b71d9e3d48201 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Thu, 8 Oct 2015 12:32:49 +0200 Subject: Imported Upstream version 1.0.25 --- backend/epsonds-jpeg.c | 226 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 226 insertions(+) create mode 100644 backend/epsonds-jpeg.c (limited to 'backend/epsonds-jpeg.c') diff --git a/backend/epsonds-jpeg.c b/backend/epsonds-jpeg.c new file mode 100644 index 0000000..76a52cb --- /dev/null +++ b/backend/epsonds-jpeg.c @@ -0,0 +1,226 @@ +/* + * epsonds-jpeg.c - Epson ESC/I-2 driver, JPEG support. + * + * Copyright (C) 2015 Tower Technologies + * Author: Alessandro Zummo + * + * 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 + +#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 UNUSEDARG cinfo) +{ +} + +METHODDEF(void) +jpeg_term_source(j_decompress_ptr UNUSEDARG 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; +} + + -- cgit v1.2.3