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/* Copyright (C) 1994, 1997, 1998, 1999 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: sdcte.c,v 1.7 2002/02/21 22:24:53 giles Exp $ */
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/* DCT encoding filter stream */
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#include "memory_.h"
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#include "stdio_.h"
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#include "jpeglib_.h"
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#include "jerror_.h"
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#include "gdebug.h"
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#include "gsmemory.h" /* for gsmalloc.h */
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#include "gsmalloc.h" /* for gs_memory_default */
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#include "strimpl.h"
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#include "sdct.h"
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#include "sjpeg.h"
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public_st_jpeg_compress_data();
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/* ------ DCTEncode ------ */
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/* JPEG destination manager procedures */
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private void
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dcte_init_destination(j_compress_ptr cinfo)
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{
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}
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private boolean
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dcte_empty_output_buffer(j_compress_ptr cinfo)
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{
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return FALSE;
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}
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private void
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dcte_term_destination(j_compress_ptr cinfo)
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{
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}
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/* Set the defaults for the DCTEncode filter. */
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private void
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s_DCTE_set_defaults(stream_state * st)
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{
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stream_DCT_state *const ss = (stream_DCT_state *) st;
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s_DCT_set_defaults(st);
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ss->QFactor = 1.0;
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ss->ColorTransform = -1;
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ss->Markers.data = 0;
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ss->Markers.size = 0;
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ss->NoMarker = true;
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}
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/* Initialize DCTEncode filter */
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private int
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s_DCTE_init(stream_state * st)
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{
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stream_DCT_state *const ss = (stream_DCT_state *) st;
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struct jpeg_destination_mgr *dest = &ss->data.compress->destination;
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dest->init_destination = dcte_init_destination;
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dest->empty_output_buffer = dcte_empty_output_buffer;
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dest->term_destination = dcte_term_destination;
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ss->data.common->memory = ss->jpeg_memory;
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ss->data.compress->cinfo.dest = dest;
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ss->phase = 0;
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return 0;
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}
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/* Process a buffer */
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private int
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s_DCTE_process(stream_state * st, stream_cursor_read * pr,
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stream_cursor_write * pw, bool last)
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{
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stream_DCT_state *const ss = (stream_DCT_state *) st;
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jpeg_compress_data *jcdp = ss->data.compress;
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struct jpeg_destination_mgr *dest = jcdp->cinfo.dest;
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if_debug2('w', "[wde]process avail=%u, last=%d\n",
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(uint) (pr->limit - pr->ptr), last);
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dest->next_output_byte = pw->ptr + 1;
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dest->free_in_buffer = pw->limit - pw->ptr;
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switch (ss->phase) {
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case 0: /* not initialized yet */
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if (gs_jpeg_start_compress(ss, TRUE) < 0)
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return ERRC;
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if_debug4('w', "[wde]width=%u, height=%u, components=%d, scan_line_size=%u\n",
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jcdp->cinfo.image_width,
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jcdp->cinfo.image_height,
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jcdp->cinfo.input_components,
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ss->scan_line_size);
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pw->ptr = dest->next_output_byte - 1;
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ss->phase = 1;
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/* falls through */
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case 1: /* initialized, Markers not written */
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if (pw->limit - pw->ptr < ss->Markers.size)
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return 1;
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memcpy(pw->ptr + 1, ss->Markers.data, ss->Markers.size);
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pw->ptr += ss->Markers.size;
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ss->phase = 2;
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/* falls through */
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case 2: /* still need to write Adobe marker */
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if (!ss->NoMarker) {
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static const byte Adobe[] =
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{
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0xFF, JPEG_APP0 + 14, 0, 14, /* parameter length */
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'A', 'd', 'o', 'b', 'e',
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0, 100, /* Version */
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0, 0, /* Flags0 */
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0, 0, /* Flags1 */
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};
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#define ADOBE_MARKER_LEN sizeof(Adobe)
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if (pw->limit - pw->ptr < ADOBE_MARKER_LEN)
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return 1;
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memcpy(pw->ptr + 1, Adobe, ADOBE_MARKER_LEN);
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pw->ptr += ADOBE_MARKER_LEN;
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*pw->ptr = ss->ColorTransform;
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#undef ADOBE_MARKER_LEN
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}
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dest->next_output_byte = pw->ptr + 1;
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dest->free_in_buffer = pw->limit - pw->ptr;
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ss->phase = 3;
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/* falls through */
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case 3: /* markers written, processing data */
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while (jcdp->cinfo.image_height > jcdp->cinfo.next_scanline) {
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int written;
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/*
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* The data argument for jpeg_write_scanlines is
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* declared as a JSAMPARRAY. There is no corresponding
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* const type, so we must remove const from the
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* argument that we are passing here. (Tom Lane of IJG
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* judges that providing const analogues of the
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* interface types wouldn't be worth the trouble.)
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*/
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/*const */ byte *samples = (byte *) (pr->ptr + 1);
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if_debug1('w', "[wde]next_scanline=%u\n",
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jcdp->cinfo.next_scanline);
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if ((uint) (pr->limit - pr->ptr) < ss->scan_line_size) {
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if (last)
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return ERRC; /* premature EOD */
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return 0; /* need more data */
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}
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written = gs_jpeg_write_scanlines(ss, &samples, 1);
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if (written < 0)
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return ERRC;
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if_debug3('w', "[wde]write returns %d, used=%u, written=%u\n",
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written,
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(uint) (samples - 1 - pr->ptr),
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(uint) (dest->next_output_byte - 1 - pw->ptr));
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pw->ptr = dest->next_output_byte - 1;
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if (!written)
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return 1; /* output full */
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pr->ptr += ss->scan_line_size;
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}
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ss->phase = 4;
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/* falls through */
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case 4: /* all data processed, finishing */
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/* jpeg_finish_compress can't suspend, so write its output
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* to a fixed-size internal buffer.
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*/
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dest->next_output_byte = jcdp->finish_compress_buf;
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dest->free_in_buffer = sizeof(jcdp->finish_compress_buf);
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if (gs_jpeg_finish_compress(ss) < 0)
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return ERRC;
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jcdp->fcb_size =
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dest->next_output_byte - jcdp->finish_compress_buf;
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jcdp->fcb_pos = 0;
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ss->phase = 5;
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/* falls through */
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case 5: /* copy the final data to the output */
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if (jcdp->fcb_pos < jcdp->fcb_size) {
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int count = min(jcdp->fcb_size - jcdp->fcb_pos,
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pw->limit - pw->ptr);
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if_debug1('w', "[wde]copying final %d\n", count);
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memcpy(pw->ptr + 1, jcdp->finish_compress_buf + jcdp->fcb_pos,
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count);
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jcdp->fcb_pos += count;
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pw->ptr += count;
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if (jcdp->fcb_pos < jcdp->fcb_size)
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return 1;
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}
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return EOFC;
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}
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/* Default case can't happen.... */
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return ERRC;
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}
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/* Release the stream */
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private void
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s_DCTE_release(stream_state * st)
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{
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stream_DCT_state *const ss = (stream_DCT_state *) st;
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gs_jpeg_destroy(ss);
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gs_free_object(ss->data.common->memory, ss->data.compress,
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"s_DCTE_release");
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/* Switch the template pointer back in case we still need it. */
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st->template = &s_DCTE_template;
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}
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/* Stream template */
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const stream_template s_DCTE_template =
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{&st_DCT_state, s_DCTE_init, s_DCTE_process, 1000, 4000, s_DCTE_release,
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s_DCTE_set_defaults
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};
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