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/* Copyright (C) 2002 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: gsovrc.c,v 1.10 2005/06/29 23:46:24 dan Exp $ */
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/* overprint/overprint mode compositor implementation */
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#include "memory_.h"
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#include "gx.h"
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#include "gserrors.h"
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#include "gsutil.h" /* for gs_next_ids */
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#include "gxcomp.h"
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#include "gxdevice.h"
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#include "gsdevice.h"
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#include "gxgetbit.h"
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#include "gsovrc.h"
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#include "gxdcolor.h"
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#include "gxoprect.h"
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#include "gsbitops.h"
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#include "gxistate.h"
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/* GC descriptor for gs_overprint_t */
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private_st_gs_overprint_t();
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/*
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* Utility routine for encoding or decoding a color index. We cannot use
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* the general integer encoding routins for these, as they may be 64 bits
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* in length (the general routines are only designed for 32 bits). We also
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* cannot use the color-specific routines, as we do not have the required
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* device color information available.
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*
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* The scheme employed is the potentially 64-bit analog of the 32-bit
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* routines: the low order seven bits of each bytes represents a base-128
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* digit, and the high order bit is set if there is another digit. The
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* encoding order is little-endian.
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*
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* The write routine returns 0 on success, with *psize set to the number
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* of bytes used. Alternatively, the return value will be gs_error_rangecheck,
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* with *psize set to the number of bytes required, if there was insufficient
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* space.
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*
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* The read routine returns the number of bytes read on success, or < 0 in
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* the event of an error.
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*/
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private int
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write_color_index(gx_color_index cindex, byte * data, uint * psize)
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{
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int num_bytes = 0;
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gx_color_index ctmp = cindex;
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for (num_bytes = 1; (ctmp >>= 7) != 0; ++num_bytes)
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;
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if (num_bytes > *psize) {
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*psize = num_bytes;
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return gs_error_rangecheck;
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}
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ctmp = cindex;
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*psize = num_bytes;
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for (; num_bytes > 1; ctmp >>= 7, --num_bytes)
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*data++ = 0x80 | (ctmp & 0x7f);
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*data = ctmp & 0x7f;
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return 0;
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}
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private int
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read_color_index(gx_color_index * pcindex, const byte * data, uint size)
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{
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gx_color_index cindex = 0;
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int nbytes = 0, shift = 0;
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for (;; shift += 7, data++) {
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if (++nbytes > size)
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return_error(gs_error_rangecheck);
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else {
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int c = *data;
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cindex += (c & 0x7f) << shift;
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if ((c & 0x80) == 0)
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break;
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}
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}
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*pcindex = cindex;
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return nbytes;
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}
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/*
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* Check for equality of two overprint compositor objects.
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*
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* This is fairly simple.
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*/
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private bool
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c_overprint_equal(const gs_composite_t * pct0, const gs_composite_t * pct1)
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{
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if (pct0->type == pct1->type) {
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const gs_overprint_params_t * pparams0;
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const gs_overprint_params_t * pparams1;
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pparams0 = &((const gs_overprint_t *)(pct0))->params;
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pparams1 = &((const gs_overprint_t *)(pct1))->params;
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if (!pparams0->retain_any_comps)
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return !pparams1->retain_any_comps;
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else if (pparams0->retain_spot_comps)
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return pparams1->retain_spot_comps;
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else
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return pparams0->drawn_comps == pparams1->drawn_comps;
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} else
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return false;
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}
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/*
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* Bits corresponding to boolean values in the first byte of the string
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* representation of an overprint compositor.
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*/
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#define OVERPRINT_ANY_COMPS 1
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#define OVERPRINT_SPOT_COMPS 2
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/*
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* Convert an overprint compositor to string form for use by the command
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* list device.
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*/
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private int
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c_overprint_write(const gs_composite_t * pct, byte * data, uint * psize)
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{
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const gs_overprint_params_t * pparams = &((const gs_overprint_t *)pct)->params;
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byte flags = 0;
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int used = 1, avail = *psize;
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/* encoded the booleans in a single byte */
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if (pparams->retain_any_comps) {
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flags |= OVERPRINT_ANY_COMPS;
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/* write out the component bits only if necessary (and possible) */
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if (pparams->retain_spot_comps)
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flags |= OVERPRINT_SPOT_COMPS;
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else {
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uint tmp_size = (avail > 0 ? avail - 1 : 0);
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int code = write_color_index( pparams->drawn_comps,
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data + 1,
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&tmp_size );
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if (code < 0 && code != gs_error_rangecheck)
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return code;
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used += tmp_size;
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}
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}
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/* check for overflow */
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*psize = used;
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if (used > avail)
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return_error(gs_error_rangecheck);
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data[0] = flags;
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return 0;
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}
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/*
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* Convert the string representation of the overprint parameter into the
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* full compositor.
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*/
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private int
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c_overprint_read(
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gs_composite_t ** ppct,
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const byte * data,
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uint size,
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gs_memory_t * mem )
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{
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gs_overprint_params_t params;
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byte flags = 0;
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int code = 0, nbytes = 1;
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if (size < 1)
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return_error(gs_error_rangecheck);
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flags = *data;
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params.retain_any_comps = (flags & OVERPRINT_ANY_COMPS) != 0;
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params.retain_spot_comps = (flags & OVERPRINT_SPOT_COMPS) != 0;
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/* check if the drawn_comps array is present */
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if (params.retain_any_comps && !params.retain_spot_comps) {
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code = read_color_index(¶ms.drawn_comps, data + 1, size - 1);
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if (code < 0)
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return code;
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nbytes += code;
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}
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code = gs_create_overprint(ppct, ¶ms, mem);
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return code < 0 ? code : nbytes;
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}
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private composite_create_default_compositor_proc(c_overprint_create_default_compositor);
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/* methods for the overprint compositor */
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const gs_composite_type_t gs_composite_overprint_type = {
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GX_COMPOSITOR_OVERPRINT,
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{
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c_overprint_create_default_compositor, /* procs.create_default_compositor */
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c_overprint_equal, /* procs.equal */
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c_overprint_write, /* procs.write */
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c_overprint_read, /* procs.read */
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gx_default_composite_clist_write_update,/* procs.composite_clist_write_update */
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gx_default_composite_clist_read_update /* procs.composite_clist_reade_update */
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} /* procs */
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};
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/*
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* Create an overprint compositor data structure.
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*
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* Currently this just a stub.
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*/
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int
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gs_create_overprint(
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gs_composite_t ** ppct,
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const gs_overprint_params_t * pparams,
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gs_memory_t * mem )
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{
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gs_overprint_t * pct;
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rc_alloc_struct_0( pct,
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gs_overprint_t,
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&st_overprint,
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mem,
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return_error(gs_error_VMerror),
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"gs_create_overprint" );
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pct->type = &gs_composite_overprint_type;
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pct->id = gs_next_ids(mem, 1);
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pct->params = *pparams;
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*ppct = (gs_composite_t *)pct;
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return 0;
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}
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/*
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* Verify that a compositor data structure is for the overprint compositor.
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* This is used by the gs_pdf1.4_device (and eventually the PDFWrite
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* device), which implements overprint and overprint mode directly.
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*/
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int
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gs_is_overprint_compositor(const gs_composite_t * pct)
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{
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return pct->type == &gs_composite_overprint_type;
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}
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/*
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* The overprint device.
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*
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* In principle there are two versions of this device: one if the traget
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* device is separable and linear, the other if it is not. The two have
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* slightly different data structures, but differ primarily in terms of
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* the standard set of methods. Because methods are non-static in
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* GhostScript, we make use of the same data structure and handle the
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* distinction during initialization.
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*
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* The data fields reflect entries in the gs_overprint_params_t
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* structure. There is no explicit retain_any_comps field, as the current
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* setting of this field can be determined by checking the fill_rectangle
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* method. There is also no retain_spot_comps field, as the code will
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* will determine explicitly which components are to be drawn.
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*/
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typedef struct overprint_device_s {
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gx_device_forward_common;
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/*
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* The set of components to be drawn. This field is used only if the
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* target color space is not separable and linear.
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*/
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gx_color_index drawn_comps;
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/*
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* The mask of gx_color_index bits to be retained during a drawing
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* operation. A bit in this mask is 1 if the corresponding bit or
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* the color index is to be retained; otherwise it is 0.
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*
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* The "non-drawn" region of the drawing gx_color_index is assumed
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* to have the value zero, so for a separable and linear color
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* encoding, the per-pixel drawing operation is:
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*
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* output = (output & retain_mask) | src
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*
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* (For the fully general case, replace src by (src & ~retain_mask).)
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* Because of byte-alignment, byte-order and performance consideration,
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* the actually implement operation may be more complex, but this does
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* not change the overall effect.
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*
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* The actual value of retain_mask will be byte swap if this is
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* required. It will be required if depth > 8 and the host processor
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* is little-endian.
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*/
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gx_color_index retain_mask;
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} overprint_device_t;
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gs_private_st_suffix_add0_final( st_overprint_device_t,
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overprint_device_t,
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"overprint_device_t",
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overprint_device_t_enum_ptrs,
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overprint_device_t_reloc_ptrs,
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gx_device_finalize,
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st_device_forward );
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/*
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* In the default (overprint false) case, the overprint device is almost
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* a pure forwarding device: only the open_device and create_compositor
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* methods are not pure-forwarding methods. The
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* gx_device_foward_fill_in_procs procedure does not fill in all of the
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* necessary procedures, so some of them are provided explicitly below.
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* The put_params procedure also requires a small modification, so that
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* the open/close state of this device always reflects that of its
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* target.
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*
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* This and other method arrays are not declared const so that they may
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* be initialized once via gx_device_forward_fill_in_procs. They are
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* constant once this initialization is complete.
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*/
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private dev_proc_open_device(overprint_open_device);
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private dev_proc_put_params(overprint_put_params);
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private dev_proc_get_page_device(overprint_get_page_device);
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private dev_proc_create_compositor(overprint_create_compositor);
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private gx_device_procs no_overprint_procs = {
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overprint_open_device, /* open_device */
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0, /* get_initial_matrix */
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0, /* sync_output */
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0, /* output_page */
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0, /* close_device */
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0, /* map_rgb_color */
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0, /* map_color_rgb */
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gx_forward_fill_rectangle, /* fill_rectangle */
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gx_forward_tile_rectangle, /* tile_rectangle */
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gx_forward_copy_mono, /* copy_mono */
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gx_forward_copy_color, /* copy_color */
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0, /* draw_line (obsolete) */
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0, /* get_bits */
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|
349 |
0, /* get_params */
|
|
|
350 |
overprint_put_params, /* put_params */
|
|
|
351 |
0, /* map_cmyk_color */
|
|
|
352 |
0, /* get_xfont_procs */
|
|
|
353 |
0, /* get_xfont_device */
|
|
|
354 |
0, /* map_rgb_alpha_color */
|
|
|
355 |
overprint_get_page_device, /* get_page_device */
|
|
|
356 |
0, /* get_alpha_bits (obsolete) */
|
|
|
357 |
0, /* copy alpha */
|
|
|
358 |
0, /* get_band */
|
|
|
359 |
0, /* copy_rop */
|
|
|
360 |
0, /* fill_path */
|
|
|
361 |
0, /* stroke_path */
|
|
|
362 |
0, /* fill_mask */
|
|
|
363 |
0, /* fill_trapezoid */
|
|
|
364 |
0, /* fill_parallelogram */
|
|
|
365 |
0, /* fill_triangle */
|
|
|
366 |
0, /* draw_thin_line */
|
|
|
367 |
0, /* begin_image */
|
|
|
368 |
0, /* image_data (obsolete) */
|
|
|
369 |
0, /* end_image (obsolete) */
|
|
|
370 |
gx_forward_strip_tile_rectangle, /* strip_tile_rectangle */
|
|
|
371 |
0, /* strip_copy_rop */
|
|
|
372 |
0, /* get_clipping_box */
|
|
|
373 |
0, /* begin_typed_image */
|
|
|
374 |
0, /* get_bits_rectangle */
|
|
|
375 |
0, /* map_color_rgb_alpha */
|
|
|
376 |
overprint_create_compositor, /* create_compositor */
|
|
|
377 |
0, /* get_hardware_params */
|
|
|
378 |
0, /* text_begin */
|
|
|
379 |
0, /* gx_finish_copydevice */
|
|
|
380 |
0, /* begin_transparency_group */
|
|
|
381 |
0, /* end_transparency_group */
|
|
|
382 |
0, /* being_transparency_mask */
|
|
|
383 |
0, /* end_transparency_mask */
|
|
|
384 |
0, /* discard_transparency_layer */
|
|
|
385 |
0, /* get_color_mapping_procs */
|
|
|
386 |
0, /* get_color_comp_index */
|
|
|
387 |
0, /* encode_color */
|
|
|
388 |
|
|
|
389 |
};
|
|
|
390 |
|
|
|
391 |
/*
|
|
|
392 |
* If overprint is set, the high and mid-level rendering methods are
|
|
|
393 |
* replaced by the default routines. The low-level color rendering methods
|
|
|
394 |
* are replaced with one of two sets of functions, depending on whether or
|
|
|
395 |
* not the target device has a separable and linear color encoding.
|
|
|
396 |
*
|
|
|
397 |
* 1. If the target device does not have a separable and linear
|
|
|
398 |
* encoding, an overprint-specific fill_rectangle method is used,
|
|
|
399 |
* and the default methods are used for all other low-level rendering
|
|
|
400 |
* methods. There is no way to achieve good rendering performance
|
|
|
401 |
* when overprint is true and the color encoding is not separable
|
|
|
402 |
* and linear, so there is little reason to use more elaborate
|
|
|
403 |
* methods int this case.
|
|
|
404 |
*
|
|
|
405 |
* 2. If the target device does have a separable and linear color
|
|
|
406 |
* model, at least the fill_rectangle method and potentially other
|
|
|
407 |
* methods will be replaced by overprint-specific methods. Those
|
|
|
408 |
* methods not replaced will have their default values. The number
|
|
|
409 |
* of methods replaced is dependent on the desired level of
|
|
|
410 |
* performance: the more methods, the better the performance.
|
|
|
411 |
*
|
|
|
412 |
* Note that certain procedures, such as copy_alpha and copy_rop,
|
|
|
413 |
* are likely to always be given their default values, as the concepts
|
|
|
414 |
* of alpha-compositing and raster operations are not compatible in
|
|
|
415 |
* a strict sense.
|
|
|
416 |
*/
|
|
|
417 |
private dev_proc_fill_rectangle(overprint_generic_fill_rectangle);
|
|
|
418 |
private dev_proc_fill_rectangle(overprint_sep_fill_rectangle);
|
|
|
419 |
/* other low-level overprint_sep_* rendering methods prototypes go here */
|
|
|
420 |
|
|
|
421 |
private gx_device_procs generic_overprint_procs = {
|
|
|
422 |
overprint_open_device, /* open_device */
|
|
|
423 |
0, /* get_initial_matrix */
|
|
|
424 |
0, /* sync_output */
|
|
|
425 |
0, /* output_page */
|
|
|
426 |
0, /* close_device */
|
|
|
427 |
0, /* map_rgb_color */
|
|
|
428 |
0, /* map_color_rgb */
|
|
|
429 |
overprint_generic_fill_rectangle, /* fill_rectangle */
|
|
|
430 |
gx_default_tile_rectangle, /* tile_rectangle */
|
|
|
431 |
gx_default_copy_mono, /* copy_mono */
|
|
|
432 |
gx_default_copy_color, /* copy_color */
|
|
|
433 |
gx_default_draw_line, /* draw_line (obsolete) */
|
|
|
434 |
0, /* get_bits */
|
|
|
435 |
0, /* get_params */
|
|
|
436 |
overprint_put_params, /* put_params */
|
|
|
437 |
0, /* map_cmyk_color */
|
|
|
438 |
0, /* get_xfont_procs */
|
|
|
439 |
gx_default_get_xfont_device, /* get_xfont_device */
|
|
|
440 |
0, /* map_rgb_alpha_color */
|
|
|
441 |
overprint_get_page_device, /* get_page_device */
|
|
|
442 |
0, /* get_alpha_bits (obsolete) */
|
|
|
443 |
gx_default_copy_alpha, /* copy alpha */
|
|
|
444 |
0, /* get_band */
|
|
|
445 |
gx_default_copy_rop, /* copy_rop */
|
|
|
446 |
gx_default_fill_path, /* fill_path */
|
|
|
447 |
gx_default_stroke_path, /* stroke_path */
|
|
|
448 |
gx_default_fill_mask, /* fill_mask */
|
|
|
449 |
gx_default_fill_trapezoid, /* fill_trapezoid */
|
|
|
450 |
gx_default_fill_parallelogram, /* fill_parallelogram */
|
|
|
451 |
gx_default_fill_triangle, /* fill_triangle */
|
|
|
452 |
gx_default_draw_thin_line, /* draw_thin_line */
|
|
|
453 |
gx_default_begin_image, /* begin_image */
|
|
|
454 |
0, /* image_data (obsolete) */
|
|
|
455 |
0, /* end_image (obsolete) */
|
|
|
456 |
gx_default_strip_tile_rectangle, /* strip_tile_rectangle */
|
|
|
457 |
gx_default_strip_copy_rop, /* strip_copy_rop */
|
|
|
458 |
0, /* get_clipping_box */
|
|
|
459 |
gx_default_begin_typed_image, /* begin_typed_image */
|
|
|
460 |
0, /* get_bits_rectangle */
|
|
|
461 |
0, /* map_color_rgb_alpha */
|
|
|
462 |
overprint_create_compositor, /* create_compositor */
|
|
|
463 |
0, /* get_hardware_params */
|
|
|
464 |
gx_default_text_begin, /* text_begin */
|
|
|
465 |
0, /* gx_finish_copydevice */
|
|
|
466 |
0, /* begin_transparency_group */
|
|
|
467 |
0, /* end_transparency_group */
|
|
|
468 |
0, /* begin_transparency_mask */
|
|
|
469 |
0, /* end_transparency_mask */
|
|
|
470 |
0, /* discard_transparency_layer */
|
|
|
471 |
0, /* get_color_mapping_procs */
|
|
|
472 |
0, /* get_color_comp_index */
|
|
|
473 |
0, /* encode_color */
|
|
|
474 |
|
|
|
475 |
};
|
|
|
476 |
|
|
|
477 |
private gx_device_procs sep_overprint_procs = {
|
|
|
478 |
overprint_open_device, /* open_device */
|
|
|
479 |
0, /* get_initial_matrix */
|
|
|
480 |
0, /* sync_output */
|
|
|
481 |
0, /* output_page */
|
|
|
482 |
0, /* close_device */
|
|
|
483 |
0, /* map_rgb_color */
|
|
|
484 |
0, /* map_color_rgb */
|
|
|
485 |
overprint_sep_fill_rectangle, /* fill_rectangle */
|
|
|
486 |
gx_default_tile_rectangle, /* tile_rectangle */
|
|
|
487 |
gx_default_copy_mono, /* copy_mono */
|
|
|
488 |
gx_default_copy_color, /* copy_color */
|
|
|
489 |
gx_default_draw_line, /* draw_line (obsolete) */
|
|
|
490 |
0, /* get_bits */
|
|
|
491 |
0, /* get_params */
|
|
|
492 |
overprint_put_params, /* put_params */
|
|
|
493 |
0, /* map_cmyk_color */
|
|
|
494 |
0, /* get_xfont_procs */
|
|
|
495 |
gx_default_get_xfont_device, /* get_xfont_device */
|
|
|
496 |
0, /* map_rgb_alpha_color */
|
|
|
497 |
overprint_get_page_device, /* get_page_device */
|
|
|
498 |
0, /* get_alpha_bits (obsolete) */
|
|
|
499 |
gx_default_copy_alpha, /* copy alpha */
|
|
|
500 |
0, /* get_band */
|
|
|
501 |
gx_default_copy_rop, /* copy_rop */
|
|
|
502 |
gx_default_fill_path, /* fill_path */
|
|
|
503 |
gx_default_stroke_path, /* stroke_path */
|
|
|
504 |
gx_default_fill_mask, /* fill_mask */
|
|
|
505 |
gx_default_fill_trapezoid, /* fill_trapezoid */
|
|
|
506 |
gx_default_fill_parallelogram, /* fill_parallelogram */
|
|
|
507 |
gx_default_fill_triangle, /* fill_triangle */
|
|
|
508 |
gx_default_draw_thin_line, /* draw_thin_line */
|
|
|
509 |
gx_default_begin_image, /* begin_image */
|
|
|
510 |
0, /* image_data (obsolete) */
|
|
|
511 |
0, /* end_image (obsolete) */
|
|
|
512 |
gx_default_strip_tile_rectangle, /* strip_tile_rectangle */
|
|
|
513 |
gx_default_strip_copy_rop, /* strip_copy_rop */
|
|
|
514 |
0, /* get_clipping_box */
|
|
|
515 |
gx_default_begin_typed_image, /* begin_typed_image */
|
|
|
516 |
0, /* get_bits_rectangle */
|
|
|
517 |
0, /* map_color_rgb_alpha */
|
|
|
518 |
overprint_create_compositor, /* create_compositor */
|
|
|
519 |
0, /* get_hardware_params */
|
|
|
520 |
gx_default_text_begin, /* text_begin */
|
|
|
521 |
0, /* gx_finish_copydevice */
|
|
|
522 |
0, /* begin_transparency_group */
|
|
|
523 |
0, /* end_transparency_group */
|
|
|
524 |
0, /* begin_transparency_mask */
|
|
|
525 |
0, /* end_transparency_mask */
|
|
|
526 |
0, /* discard_transparency_layer */
|
|
|
527 |
0, /* get_color_mapping_procs */
|
|
|
528 |
0, /* get_color_comp_index */
|
|
|
529 |
0, /* encode_color */
|
|
|
530 |
|
|
|
531 |
};
|
|
|
532 |
|
|
|
533 |
/*
|
|
|
534 |
* The prototype for the overprint device does not provide much
|
|
|
535 |
* information; it exists primarily to facilitate use gx_init_device
|
|
|
536 |
* and sundry other device utility routines.
|
|
|
537 |
*/
|
|
|
538 |
const overprint_device_t gs_overprint_device = {
|
|
|
539 |
std_device_std_body_open( overprint_device_t, /* device type */
|
|
|
540 |
0, /* static_procs */
|
|
|
541 |
"overprint_device", /* dname */
|
|
|
542 |
0, 0, /* width, height */
|
|
|
543 |
1, 1 ), /* HWResolution */
|
|
|
544 |
{ 0 } /* procs */
|
|
|
545 |
};
|
|
|
546 |
|
|
|
547 |
|
|
|
548 |
|
|
|
549 |
/*
|
|
|
550 |
* Utility to reorder bytes in a color or mask based on the endianness of
|
|
|
551 |
* the current device. This is required on little-endian machines if the
|
|
|
552 |
* depth is larger 8. The resulting value is also replicated to fill the
|
|
|
553 |
* entire gx_color_index if the depth is a divisor of the color index
|
|
|
554 |
* size. If this is not the case, the result will be in the low-order
|
|
|
555 |
* bytes of the color index.
|
|
|
556 |
*
|
|
|
557 |
* Though this process can be handled in full generality, the code below
|
|
|
558 |
* takes advantage of the fact that depths that are > 8 must be a multiple
|
|
|
559 |
* of 8 and <= 64
|
|
|
560 |
*/
|
|
|
561 |
#if !arch_is_big_endian
|
|
|
562 |
|
|
|
563 |
private gx_color_index
|
|
|
564 |
swap_color_index(int depth, gx_color_index color)
|
|
|
565 |
{
|
|
|
566 |
int shift = depth - 8;
|
|
|
567 |
gx_color_index mask = 0xff;
|
|
|
568 |
|
|
|
569 |
color = ((color >> shift) & mask)
|
|
|
570 |
| ((color & mask) << shift)
|
|
|
571 |
| (color & ~((mask << shift) | mask));
|
|
|
572 |
if (depth > 24) {
|
|
|
573 |
shift -= 16;
|
|
|
574 |
mask <<= 8;
|
|
|
575 |
color = ((color >> shift) & mask)
|
|
|
576 |
| ((color & mask) << shift)
|
|
|
577 |
| (color & ~((mask << shift) | mask));
|
|
|
578 |
|
|
|
579 |
if (depth > 40) {
|
|
|
580 |
shift -= 16;
|
|
|
581 |
mask <<= 8;
|
|
|
582 |
color = ((color >> shift) & mask)
|
|
|
583 |
| ((color & mask) << shift)
|
|
|
584 |
| (color & ~((mask << shift) | mask));
|
|
|
585 |
|
|
|
586 |
if (depth > 56) {
|
|
|
587 |
shift -= 16;
|
|
|
588 |
mask <<= 8;
|
|
|
589 |
color = ((color >> shift) & mask)
|
|
|
590 |
| ((color & mask) << shift)
|
|
|
591 |
| (color & ~((mask << shift) | mask));
|
|
|
592 |
}
|
|
|
593 |
}
|
|
|
594 |
}
|
|
|
595 |
|
|
|
596 |
return color;
|
|
|
597 |
}
|
|
|
598 |
|
|
|
599 |
#endif /* !arch_is_big_endian */
|
|
|
600 |
|
|
|
601 |
/*
|
|
|
602 |
* Update the retain_mask field to reflect the information in the
|
|
|
603 |
* drawn_comps field. This is useful only if the device color model
|
|
|
604 |
* is separable.
|
|
|
605 |
*/
|
|
|
606 |
private void
|
|
|
607 |
set_retain_mask(overprint_device_t * opdev)
|
|
|
608 |
{
|
|
|
609 |
int i, ncomps = opdev->color_info.num_components;
|
|
|
610 |
gx_color_index drawn_comps = opdev->drawn_comps, retain_mask = 0;
|
|
|
611 |
#if !arch_is_big_endian
|
|
|
612 |
int depth = opdev->color_info.depth;
|
|
|
613 |
#endif
|
|
|
614 |
|
|
|
615 |
for (i = 0; i < ncomps; i++, drawn_comps >>= 1) {
|
|
|
616 |
if ((drawn_comps & 0x1) == 0)
|
|
|
617 |
retain_mask |= opdev->color_info.comp_mask[i];
|
|
|
618 |
}
|
|
|
619 |
#if !arch_is_big_endian
|
|
|
620 |
if (depth > 8)
|
|
|
621 |
retain_mask = swap_color_index(depth, retain_mask);
|
|
|
622 |
#endif
|
|
|
623 |
opdev->retain_mask = retain_mask;
|
|
|
624 |
}
|
|
|
625 |
|
|
|
626 |
/* enlarge mask of non-zero components */
|
|
|
627 |
private gx_color_index
|
|
|
628 |
check_drawn_comps(int ncomps, frac cvals[GX_DEVICE_COLOR_MAX_COMPONENTS])
|
|
|
629 |
{
|
|
|
630 |
int i;
|
|
|
631 |
gx_color_index mask = 0x1, drawn_comps = 0;
|
|
|
632 |
|
|
|
633 |
for (i = 0; i < ncomps; i++, mask <<= 1) {
|
|
|
634 |
if (cvals[i] != frac_0)
|
|
|
635 |
drawn_comps |= mask;
|
|
|
636 |
}
|
|
|
637 |
return drawn_comps;
|
|
|
638 |
}
|
|
|
639 |
|
|
|
640 |
/*
|
|
|
641 |
* Update the overprint-specific device parameters.
|
|
|
642 |
*
|
|
|
643 |
* If spot colors are to be retain, the set of process (non-spot) colors is
|
|
|
644 |
* determined by mapping through the standard color spaces and check which
|
|
|
645 |
* components assume non-zero values.
|
|
|
646 |
*/
|
|
|
647 |
private int
|
|
|
648 |
update_overprint_params(
|
|
|
649 |
overprint_device_t * opdev,
|
|
|
650 |
const gs_overprint_params_t * pparams )
|
|
|
651 |
{
|
|
|
652 |
int ncomps = opdev->color_info.num_components;
|
|
|
653 |
|
|
|
654 |
/* check if overprint is to be turned off */
|
|
|
655 |
if (!pparams->retain_any_comps) {
|
|
|
656 |
/* if fill_rectangle forwards, overprint is already off */
|
|
|
657 |
if (dev_proc(opdev, fill_rectangle) != gx_forward_fill_rectangle)
|
|
|
658 |
memcpy( &opdev->procs,
|
|
|
659 |
&no_overprint_procs,
|
|
|
660 |
sizeof(no_overprint_procs) );
|
|
|
661 |
return 0;
|
|
|
662 |
}
|
|
|
663 |
|
|
|
664 |
/* set the procedures according to the color model */
|
|
|
665 |
if (opdev->color_info.separable_and_linear == GX_CINFO_SEP_LIN)
|
|
|
666 |
memcpy( &opdev->procs,
|
|
|
667 |
&sep_overprint_procs,
|
|
|
668 |
sizeof(sep_overprint_procs) );
|
|
|
669 |
else
|
|
|
670 |
memcpy( &opdev->procs,
|
|
|
671 |
&generic_overprint_procs,
|
|
|
672 |
sizeof(generic_overprint_procs) );
|
|
|
673 |
|
|
|
674 |
/* see if we need to determine the spot color components */
|
|
|
675 |
if (!pparams->retain_spot_comps)
|
|
|
676 |
opdev->drawn_comps = pparams->drawn_comps;
|
|
|
677 |
else {
|
|
|
678 |
gx_device * dev = (gx_device *)opdev;
|
|
|
679 |
const gx_cm_color_map_procs * pprocs;
|
|
|
680 |
frac cvals[GX_DEVICE_COLOR_MAX_COMPONENTS];
|
|
|
681 |
gx_color_index drawn_comps = 0;
|
|
|
682 |
static const frac frac_13 = float2frac(1.0 / 3.0);
|
|
|
683 |
|
|
|
684 |
if ((pprocs = dev_proc(opdev, get_color_mapping_procs)(dev)) == 0 ||
|
|
|
685 |
pprocs->map_gray == 0 ||
|
|
|
686 |
pprocs->map_rgb == 0 ||
|
|
|
687 |
pprocs->map_cmyk == 0 )
|
|
|
688 |
return_error(gs_error_unknownerror);
|
|
|
689 |
|
|
|
690 |
pprocs->map_gray(dev, frac_13, cvals);
|
|
|
691 |
drawn_comps |= check_drawn_comps(ncomps, cvals);
|
|
|
692 |
|
|
|
693 |
pprocs->map_rgb(dev, 0, frac_13, frac_0, frac_0, cvals);
|
|
|
694 |
drawn_comps |= check_drawn_comps(ncomps, cvals);
|
|
|
695 |
pprocs->map_rgb(dev, 0, frac_0, frac_13, frac_0, cvals);
|
|
|
696 |
drawn_comps |= check_drawn_comps(ncomps, cvals);
|
|
|
697 |
pprocs->map_rgb(dev, 0, frac_0, frac_0, frac_13, cvals);
|
|
|
698 |
drawn_comps |= check_drawn_comps(ncomps, cvals);
|
|
|
699 |
|
|
|
700 |
pprocs->map_cmyk(dev, frac_13, frac_0, frac_0, frac_0, cvals);
|
|
|
701 |
drawn_comps |= check_drawn_comps(ncomps, cvals);
|
|
|
702 |
pprocs->map_cmyk(dev, frac_0, frac_13, frac_0, frac_0, cvals);
|
|
|
703 |
drawn_comps |= check_drawn_comps(ncomps, cvals);
|
|
|
704 |
pprocs->map_cmyk(dev, frac_0, frac_0, frac_13, frac_0, cvals);
|
|
|
705 |
drawn_comps |= check_drawn_comps(ncomps, cvals);
|
|
|
706 |
pprocs->map_cmyk(dev, frac_0, frac_0, frac_0, frac_13, cvals);
|
|
|
707 |
drawn_comps |= check_drawn_comps(ncomps, cvals);
|
|
|
708 |
|
|
|
709 |
opdev->drawn_comps = drawn_comps;
|
|
|
710 |
}
|
|
|
711 |
|
|
|
712 |
/* check for degenerate case */
|
|
|
713 |
if (opdev->drawn_comps == ((gx_color_index)1 << ncomps) - 1) {
|
|
|
714 |
memcpy( &opdev->procs,
|
|
|
715 |
&no_overprint_procs,
|
|
|
716 |
sizeof(no_overprint_procs) );
|
|
|
717 |
return 0;
|
|
|
718 |
}
|
|
|
719 |
|
|
|
720 |
/* if appropriate, update the retain_mask field */
|
|
|
721 |
if (opdev->color_info.separable_and_linear == GX_CINFO_SEP_LIN)
|
|
|
722 |
set_retain_mask(opdev);
|
|
|
723 |
|
|
|
724 |
return 0;
|
|
|
725 |
}
|
|
|
726 |
|
|
|
727 |
|
|
|
728 |
/*
|
|
|
729 |
* The open_device method for the overprint device is about as close to
|
|
|
730 |
* a pure "forwarding" open_device operation as is possible. Its only
|
|
|
731 |
* significant function is to ensure that the is_open field of the
|
|
|
732 |
* overprint device matches that of the target device.
|
|
|
733 |
*
|
|
|
734 |
* We assume this procedure is called only if the device is not already
|
|
|
735 |
* open, and that gs_opendevice will take care of the is_open flag.
|
|
|
736 |
*/
|
|
|
737 |
private int
|
|
|
738 |
overprint_open_device(gx_device * dev)
|
|
|
739 |
{
|
|
|
740 |
overprint_device_t * opdev = (overprint_device_t *)dev;
|
|
|
741 |
gx_device * tdev = opdev->target;
|
|
|
742 |
int code = 0;
|
|
|
743 |
|
|
|
744 |
/* the overprint device must have a target */
|
|
|
745 |
if (tdev == 0)
|
|
|
746 |
return_error(gs_error_unknownerror);
|
|
|
747 |
if ((code = gs_opendevice(tdev)) >= 0)
|
|
|
748 |
gx_device_copy_params(dev, tdev);
|
|
|
749 |
return code;
|
|
|
750 |
}
|
|
|
751 |
|
|
|
752 |
/*
|
|
|
753 |
* The put_params method for the overprint device will check if the
|
|
|
754 |
* target device has closed and, if so, close itself.
|
|
|
755 |
*/
|
|
|
756 |
private int
|
|
|
757 |
overprint_put_params(gx_device * dev, gs_param_list * plist)
|
|
|
758 |
{
|
|
|
759 |
overprint_device_t * opdev = (overprint_device_t *)dev;
|
|
|
760 |
gx_device * tdev = opdev->target;
|
|
|
761 |
int code = 0;
|
|
|
762 |
|
|
|
763 |
|
|
|
764 |
if (tdev != 0 && (code = dev_proc(tdev, put_params)(tdev, plist)) >= 0) {
|
|
|
765 |
gx_device_decache_colors(dev);
|
|
|
766 |
if (!tdev->is_open)
|
|
|
767 |
code = gs_closedevice(dev);
|
|
|
768 |
}
|
|
|
769 |
return code;
|
|
|
770 |
}
|
|
|
771 |
|
|
|
772 |
/*
|
|
|
773 |
* The overprint device must never be confused with a page device.
|
|
|
774 |
* Thus, we always forward the request for the page device to the
|
|
|
775 |
* target, as should all forwarding devices.
|
|
|
776 |
*/
|
|
|
777 |
private gx_device *
|
|
|
778 |
overprint_get_page_device(gx_device * dev)
|
|
|
779 |
{
|
|
|
780 |
overprint_device_t * opdev = (overprint_device_t *)dev;
|
|
|
781 |
gx_device * tdev = opdev->target;
|
|
|
782 |
|
|
|
783 |
return tdev == 0 ? 0 : dev_proc(tdev, get_page_device)(tdev);
|
|
|
784 |
}
|
|
|
785 |
|
|
|
786 |
/*
|
|
|
787 |
* Calling create_compositor on the overprint device just updates the
|
|
|
788 |
* overprint parameters; no new device is created.
|
|
|
789 |
*/
|
|
|
790 |
private int
|
|
|
791 |
overprint_create_compositor(
|
|
|
792 |
gx_device * dev,
|
|
|
793 |
gx_device ** pcdev,
|
|
|
794 |
const gs_composite_t * pct,
|
|
|
795 |
gs_imager_state * pis,
|
|
|
796 |
gs_memory_t * memory )
|
|
|
797 |
{
|
|
|
798 |
if (pct->type != &gs_composite_overprint_type)
|
|
|
799 |
return gx_default_create_compositor(dev, pcdev, pct, pis, memory);
|
|
|
800 |
else {
|
|
|
801 |
int code;
|
|
|
802 |
|
|
|
803 |
/* device must already exist, so just update the parameters */
|
|
|
804 |
code = update_overprint_params(
|
|
|
805 |
(overprint_device_t *)dev,
|
|
|
806 |
&((const gs_overprint_t *)pct)->params );
|
|
|
807 |
if (code >= 0)
|
|
|
808 |
*pcdev = dev;
|
|
|
809 |
return code;
|
|
|
810 |
}
|
|
|
811 |
}
|
|
|
812 |
|
|
|
813 |
|
|
|
814 |
/*
|
|
|
815 |
* The two rectangle-filling routines (which do the actual work) are just
|
|
|
816 |
* stubbs for the time being. The actual routines would allocate a buffer,
|
|
|
817 |
* use get_bits_rectangle to build a buffer of the existing data, modify
|
|
|
818 |
* the appropriate components, then invoke the copy_color procedure on the
|
|
|
819 |
* target device.
|
|
|
820 |
*/
|
|
|
821 |
private int
|
|
|
822 |
overprint_generic_fill_rectangle(
|
|
|
823 |
gx_device * dev,
|
|
|
824 |
int x,
|
|
|
825 |
int y,
|
|
|
826 |
int width,
|
|
|
827 |
int height,
|
|
|
828 |
gx_color_index color )
|
|
|
829 |
{
|
|
|
830 |
overprint_device_t * opdev = (overprint_device_t *)dev;
|
|
|
831 |
gx_device * tdev = opdev->target;
|
|
|
832 |
|
|
|
833 |
if (tdev == 0)
|
|
|
834 |
return 0;
|
|
|
835 |
else
|
|
|
836 |
return gx_overprint_generic_fill_rectangle( tdev,
|
|
|
837 |
opdev->drawn_comps,
|
|
|
838 |
x, y, width, height,
|
|
|
839 |
color,
|
|
|
840 |
dev->memory );
|
|
|
841 |
}
|
|
|
842 |
|
|
|
843 |
private int
|
|
|
844 |
overprint_sep_fill_rectangle(
|
|
|
845 |
gx_device * dev,
|
|
|
846 |
int x,
|
|
|
847 |
int y,
|
|
|
848 |
int width,
|
|
|
849 |
int height,
|
|
|
850 |
gx_color_index color )
|
|
|
851 |
{
|
|
|
852 |
overprint_device_t * opdev = (overprint_device_t *)dev;
|
|
|
853 |
gx_device * tdev = opdev->target;
|
|
|
854 |
|
|
|
855 |
if (tdev == 0)
|
|
|
856 |
return 0;
|
|
|
857 |
else {
|
|
|
858 |
int depth = tdev->color_info.depth;
|
|
|
859 |
|
|
|
860 |
/*
|
|
|
861 |
* Swap the color index into the order required by a byte-oriented
|
|
|
862 |
* bitmap. This is required only for littl-endian processors, and
|
|
|
863 |
* then only if the depth > 8.
|
|
|
864 |
*/
|
|
|
865 |
#if !arch_is_big_endian
|
|
|
866 |
if (depth > 8)
|
|
|
867 |
color = swap_color_index(depth, color);
|
|
|
868 |
#endif
|
|
|
869 |
|
|
|
870 |
/*
|
|
|
871 |
* We can handle rectangle filling via bits_fill_rectangle_masked
|
|
|
872 |
* if the depth is a divisor of 8 * sizeof(mono_fill_chunk). The
|
|
|
873 |
* non-masked fill_rectangle code uses a byte-oriented routine
|
|
|
874 |
* if depth > 8, but there is not much advantage to doing so if
|
|
|
875 |
* masking is required.
|
|
|
876 |
*
|
|
|
877 |
* Directly testing (8 * sizeof(mono_fill_chunk)) % depth is
|
|
|
878 |
* potentially expensive, since many rectangles are small. We
|
|
|
879 |
* can avoid the modulus operation by noting that
|
|
|
880 |
* 8 * sizeof(mono_fill_chunk) will be a power of 2, and so
|
|
|
881 |
* we need only check that depth is a power of 2 and
|
|
|
882 |
* depth < 8 * sizeof(mono_fill_chunk).
|
|
|
883 |
*/
|
|
|
884 |
if ( depth <= 8 * sizeof(mono_fill_chunk) &&
|
|
|
885 |
(depth & (depth - 1)) == 0 )
|
|
|
886 |
return gx_overprint_sep_fill_rectangle_1( tdev,
|
|
|
887 |
opdev->retain_mask,
|
|
|
888 |
x, y, width, height,
|
|
|
889 |
color,
|
|
|
890 |
dev->memory );
|
|
|
891 |
else
|
|
|
892 |
return gx_overprint_sep_fill_rectangle_2( tdev,
|
|
|
893 |
opdev->retain_mask,
|
|
|
894 |
x, y, width, height,
|
|
|
895 |
color,
|
|
|
896 |
dev->memory );
|
|
|
897 |
}
|
|
|
898 |
}
|
|
|
899 |
|
|
|
900 |
|
|
|
901 |
/* complete a porcedure set */
|
|
|
902 |
private void
|
|
|
903 |
fill_in_procs(gx_device_procs * pprocs)
|
|
|
904 |
{
|
|
|
905 |
gx_device_forward tmpdev;
|
|
|
906 |
|
|
|
907 |
/*
|
|
|
908 |
* gx_device_forward_fill_in_procs calls gx_device_fill_in_procs, which
|
|
|
909 |
* requires the color_info field of the device be set to "reasonable"
|
|
|
910 |
* values. Which values is irrelevant in this case, but they must not
|
|
|
911 |
* contain dangling pointers, excessive numbers of components, etc.
|
|
|
912 |
*/
|
|
|
913 |
memcpy( &tmpdev.color_info,
|
|
|
914 |
&gs_overprint_device.color_info,
|
|
|
915 |
sizeof(tmpdev.color_info) );
|
|
|
916 |
/*
|
|
|
917 |
* Prevent the check_device_separable routine from executing while we
|
|
|
918 |
* fill in the procs. Our tmpdev is not complete enough for it.
|
|
|
919 |
*/
|
|
|
920 |
tmpdev.color_info.separable_and_linear = GX_CINFO_SEP_LIN_NONE;
|
|
|
921 |
tmpdev.static_procs = 0;
|
|
|
922 |
memcpy(&tmpdev.procs, pprocs, sizeof(tmpdev.procs));
|
|
|
923 |
gx_device_forward_fill_in_procs(&tmpdev);
|
|
|
924 |
memcpy(pprocs, &tmpdev.procs, sizeof(tmpdev.procs));
|
|
|
925 |
}
|
|
|
926 |
|
|
|
927 |
/*
|
|
|
928 |
* Create an overprint compositor.
|
|
|
929 |
*
|
|
|
930 |
* Note that this routine will be called only if the device is not already
|
|
|
931 |
* an overprint compositor. Hence, if pct->params.retain_any_comps is
|
|
|
932 |
* false, we can just return.
|
|
|
933 |
*
|
|
|
934 |
* We also suppress use of overprint if the current device color model has only
|
|
|
935 |
* a single component. In this case overprint mode is inapplicable (it applies
|
|
|
936 |
* only to CMYK devices), and nothing can possibly be gained by using overprint.
|
|
|
937 |
* More significantly, this cause avoids erroneous use of overprint when a
|
|
|
938 |
* mask caching device is the current device, which would otherwise require
|
|
|
939 |
* elaborate special handling in the caching device create_compositor
|
|
|
940 |
* procedure.
|
|
|
941 |
*/
|
|
|
942 |
private int
|
|
|
943 |
c_overprint_create_default_compositor(
|
|
|
944 |
const gs_composite_t * pct,
|
|
|
945 |
gx_device ** popdev,
|
|
|
946 |
gx_device * tdev,
|
|
|
947 |
gs_imager_state * pis,
|
|
|
948 |
gs_memory_t * mem )
|
|
|
949 |
{
|
|
|
950 |
const gs_overprint_t * ovrpct = (const gs_overprint_t *)pct;
|
|
|
951 |
overprint_device_t * opdev = 0;
|
|
|
952 |
|
|
|
953 |
/* see if there is anything to do */
|
|
|
954 |
if ( !ovrpct->params.retain_any_comps) {
|
|
|
955 |
*popdev = tdev;
|
|
|
956 |
return 0;
|
|
|
957 |
}
|
|
|
958 |
|
|
|
959 |
/* check if the procedure arrays have been initialized */
|
|
|
960 |
if (no_overprint_procs.get_xfont_procs == 0) {
|
|
|
961 |
fill_in_procs(&no_overprint_procs);
|
|
|
962 |
fill_in_procs(&generic_overprint_procs);
|
|
|
963 |
fill_in_procs(&sep_overprint_procs);
|
|
|
964 |
}
|
|
|
965 |
|
|
|
966 |
/* build the overprint device */
|
|
|
967 |
opdev = gs_alloc_struct_immovable( mem,
|
|
|
968 |
overprint_device_t,
|
|
|
969 |
&st_overprint_device_t,
|
|
|
970 |
"create overprint compositor" );
|
|
|
971 |
if ((*popdev = (gx_device *)opdev) == 0)
|
|
|
972 |
return_error(gs_error_VMerror);
|
|
|
973 |
gx_device_init( (gx_device *)opdev,
|
|
|
974 |
(const gx_device *)&gs_overprint_device,
|
|
|
975 |
mem,
|
|
|
976 |
true );
|
|
|
977 |
gx_device_copy_params((gx_device *)opdev, tdev);
|
|
|
978 |
gx_device_set_target((gx_device_forward *)opdev, tdev);
|
|
|
979 |
|
|
|
980 |
/* set up the overprint parameters */
|
|
|
981 |
return update_overprint_params( opdev,
|
|
|
982 |
&((const gs_overprint_t *)pct)->params );
|
|
|
983 |
}
|