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/* Copyright (C) 1994, 1997, 1998, 1999 Aladdin Enterprises. All rights reserved.
This software is licensed to a single customer by Artifex Software Inc.
under the terms of a specific OEM agreement.
*/
/*$RCSfile$ $Revision$ */
/* DCT encoding filter stream */
#include "memory_.h"
#include "stdio_.h"
#include "jpeglib_.h"
#include "jerror_.h"
#include "gdebug.h"
#include "gsmemory.h" /* for gsmalloc.h */
#include "gsmalloc.h" /* for gs_memory_default */
#include "strimpl.h"
#include "sdct.h"
#include "sjpeg.h"
/* ------ DCTEncode ------ */
/* JPEG destination manager procedures */
private void
dcte_init_destination(j_compress_ptr cinfo)
{
}
private boolean
dcte_empty_output_buffer(j_compress_ptr cinfo)
{
return FALSE;
}
private void
dcte_term_destination(j_compress_ptr cinfo)
{
}
/* Set the defaults for the DCTEncode filter. */
private void
s_DCTE_set_defaults(stream_state * st)
{
stream_DCT_state *const ss = (stream_DCT_state *) st;
s_DCT_set_defaults(st);
ss->QFactor = 1.0;
ss->ColorTransform = 0;
ss->Markers.data = 0;
ss->Markers.size = 0;
ss->NoMarker = true;
}
/* Initialize DCTEncode filter */
private int
s_DCTE_init(stream_state * st)
{
stream_DCT_state *const ss = (stream_DCT_state *) st;
struct jpeg_destination_mgr *dest = &ss->data.compress->destination;
dest->init_destination = dcte_init_destination;
dest->empty_output_buffer = dcte_empty_output_buffer;
dest->term_destination = dcte_term_destination;
ss->data.common->memory = ss->jpeg_memory;
ss->data.compress->cinfo.dest = dest;
ss->phase = 0;
return 0;
}
/* Process a buffer */
private int
s_DCTE_process(stream_state * st, stream_cursor_read * pr,
stream_cursor_write * pw, bool last)
{
stream_DCT_state *const ss = (stream_DCT_state *) st;
jpeg_compress_data *jcdp = ss->data.compress;
struct jpeg_destination_mgr *dest = jcdp->cinfo.dest;
dest->next_output_byte = pw->ptr + 1;
dest->free_in_buffer = pw->limit - pw->ptr;
switch (ss->phase) {
case 0: /* not initialized yet */
if (gs_jpeg_start_compress(ss, TRUE) < 0)
return ERRC;
pw->ptr = dest->next_output_byte - 1;
ss->phase = 1;
/* falls through */
case 1: /* initialized, Markers not written */
if (pw->limit - pw->ptr < ss->Markers.size)
return 1;
memcpy(pw->ptr + 1, ss->Markers.data, ss->Markers.size);
pw->ptr += ss->Markers.size;
ss->phase = 2;
/* falls through */
case 2: /* still need to write Adobe marker */
if (!ss->NoMarker) {
static const byte Adobe[] =
{
0xFF, JPEG_APP0 + 14, 0, 14, /* parameter length */
'A', 'd', 'o', 'b', 'e',
0, 100, /* Version */
0, 0, /* Flags0 */
0, 0, /* Flags1 */
0 /* ColorTransform */
};
#define ADOBE_MARKER_LEN sizeof(Adobe)
if (pw->limit - pw->ptr < ADOBE_MARKER_LEN)
return 1;
memcpy(pw->ptr + 1, Adobe, ADOBE_MARKER_LEN);
pw->ptr += ADOBE_MARKER_LEN;
*pw->ptr = ss->ColorTransform;
#undef ADOBE_MARKER_LEN
}
dest->next_output_byte = pw->ptr + 1;
dest->free_in_buffer = pw->limit - pw->ptr;
ss->phase = 3;
/* falls through */
case 3: /* markers written, processing data */
while (jcdp->cinfo.image_height > jcdp->cinfo.next_scanline) {
int written;
/*
* The data argument for jpeg_write_scanlines is
* declared as a JSAMPARRAY. There is no corresponding
* const type, so we must remove const from the
* argument that we are passing here. (Tom Lane of IJG
* judges that providing const analogues of the
* interface types wouldn't be worth the trouble.)
*/
/*const */ byte *samples = (byte *) (pr->ptr + 1);
if ((uint) (pr->limit - pr->ptr) < ss->scan_line_size) {
if (last)
return ERRC; /* premature EOD */
return 0; /* need more data */
}
written = gs_jpeg_write_scanlines(ss, &samples, 1);
if (written < 0)
return ERRC;
pw->ptr = dest->next_output_byte - 1;
if (!written)
return 1; /* output full */
pr->ptr += ss->scan_line_size;
}
ss->phase = 4;
/* falls through */
case 4: /* all data processed, finishing */
/* jpeg_finish_compress can't suspend, so write its output
* to a fixed-size internal buffer.
*/
dest->next_output_byte = jcdp->finish_compress_buf;
dest->free_in_buffer = sizeof(jcdp->finish_compress_buf);
if (gs_jpeg_finish_compress(ss) < 0)
return ERRC;
jcdp->fcb_size =
dest->next_output_byte - jcdp->finish_compress_buf;
jcdp->fcb_pos = 0;
ss->phase = 5;
/* falls through */
case 5: /* copy the final data to the output */
if (jcdp->fcb_pos < jcdp->fcb_size) {
int count = min(jcdp->fcb_size - jcdp->fcb_pos,
pw->limit - pw->ptr);
memcpy(pw->ptr + 1, jcdp->finish_compress_buf + jcdp->fcb_pos,
count);
jcdp->fcb_pos += count;
pw->ptr += count;
if (jcdp->fcb_pos < jcdp->fcb_size)
return 1;
}
return EOFC;
}
/* Default case can't happen.... */
return ERRC;
}
/* Release the stream */
private void
s_DCTE_release(stream_state * st)
{
stream_DCT_state *const ss = (stream_DCT_state *) st;
gs_jpeg_destroy(ss);
gs_free_object(ss->data.common->memory, ss->data.compress,
"s_DCTE_release");
/* Switch the template pointer back in case we still need it. */
st->template = &s_DCTE_template;
}
/* Stream template */
const stream_template s_DCTE_template =
{&st_DCT_state, s_DCTE_init, s_DCTE_process, 1000, 4000, s_DCTE_release,
s_DCTE_set_defaults
};
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