/* Copyright (C) 1997, 2000 Aladdin Enterprises.  All rights reserved.
  
  This file is part of GNU Ghostscript.
  
  GNU Ghostscript is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
  to anyone for the consequences of using it or for whether it serves any
  particular purpose or works at all, unless he says so in writing.  Refer
  to the GNU General Public License for full details.
  
  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given
  to you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
  copies.
*/

/*$RCSfile: gdevpsdu.c,v $ $Revision: 1.7.2.4 $ */
/* Common utilities for PostScript and PDF writers */
#include "stdio_.h"		/* for FILE for jpeglib.h */
#include "jpeglib_.h"		/* for sdct.h */
#include "memory_.h"
#include <stdlib.h>		/* for qsort */
#include "gx.h"
#include "gserrors.h"
#include "gdevpsdf.h"
#include "gxfont.h"
#include "scanchar.h"
#include "strimpl.h"
#include "sa85x.h"
#include "scfx.h"
#include "sdct.h"
#include "sjpeg.h"
#include "spprint.h"
#include "sstring.h"

/* Structure descriptors */
public_st_device_psdf();
public_st_psdf_binary_writer();

/* Standard color command names. */
const psdf_set_color_commands_t psdf_set_fill_color_commands = {
    "g", "rg", "k", "cs", "sc", "scn"
};
const psdf_set_color_commands_t psdf_set_stroke_color_commands = {
    "G", "RG", "K", "CS", "SC", "SCN"
};


/* Define parameter-setting procedures. */
extern stream_state_proc_put_params(s_DCTE_put_params, stream_DCT_state);

/* ---------------- Vector implementation procedures ---------------- */

int
psdf_setlinewidth(gx_device_vector * vdev, floatp width)
{
    pprintg1(gdev_vector_stream(vdev), "%g w\n", width);
    return 0;
}

int
psdf_setlinecap(gx_device_vector * vdev, gs_line_cap cap)
{
    pprintd1(gdev_vector_stream(vdev), "%d J\n", cap);
    return 0;
}

int
psdf_setlinejoin(gx_device_vector * vdev, gs_line_join join)
{
    pprintd1(gdev_vector_stream(vdev), "%d j\n", join);
    return 0;
}

int
psdf_setmiterlimit(gx_device_vector * vdev, floatp limit)
{
    pprintg1(gdev_vector_stream(vdev), "%g M\n", limit);
    return 0;
}

int
psdf_setdash(gx_device_vector * vdev, const float *pattern, uint count,
	     floatp offset)
{
    stream *s = gdev_vector_stream(vdev);
    int i;

    stream_puts(s, "[ ");
    for (i = 0; i < count; ++i)
	pprintg1(s, "%g ", pattern[i]);
    pprintg1(s, "] %g d\n", offset);
    return 0;
}

int
psdf_setflat(gx_device_vector * vdev, floatp flatness)
{
    pprintg1(gdev_vector_stream(vdev), "%g i\n", flatness);
    return 0;
}

int
psdf_setlogop(gx_device_vector * vdev, gs_logical_operation_t lop,
	      gs_logical_operation_t diff)
{
/****** SHOULD AT LEAST DETECT SET-0 & SET-1 ******/
    return 0;
}

int
psdf_setfillcolor(gx_device_vector * vdev, const gx_drawing_color * pdc)
{
    return psdf_set_color(vdev, pdc, &psdf_set_fill_color_commands);
}

int
psdf_setstrokecolor(gx_device_vector * vdev, const gx_drawing_color * pdc)
{
    return psdf_set_color(vdev, pdc, &psdf_set_stroke_color_commands);
}

int
psdf_dorect(gx_device_vector * vdev, fixed x0, fixed y0, fixed x1, fixed y1,
	    gx_path_type_t type)
{
    int code = (*vdev_proc(vdev, beginpath)) (vdev, type);

    if (code < 0)
	return code;
    pprintg4(gdev_vector_stream(vdev), "%g %g %g %g re\n",
	     fixed2float(x0), fixed2float(y0),
	     fixed2float(x1 - x0), fixed2float(y1 - y0));
    return (*vdev_proc(vdev, endpath)) (vdev, type);
}

int
psdf_beginpath(gx_device_vector * vdev, gx_path_type_t type)
{
    return 0;
}

int
psdf_moveto(gx_device_vector * vdev, floatp x0, floatp y0, floatp x, floatp y,
	    gx_path_type_t type)
{
    pprintg2(gdev_vector_stream(vdev), "%g %g m\n", x, y);
    return 0;
}

int
psdf_lineto(gx_device_vector * vdev, floatp x0, floatp y0, floatp x, floatp y,
	    gx_path_type_t type)
{
    pprintg2(gdev_vector_stream(vdev), "%g %g l\n", x, y);
    return 0;
}

int
psdf_curveto(gx_device_vector * vdev, floatp x0, floatp y0,
	   floatp x1, floatp y1, floatp x2, floatp y2, floatp x3, floatp y3,
	     gx_path_type_t type)
{
    if (x1 == x0 && y1 == y0)
	pprintg4(gdev_vector_stream(vdev), "%g %g %g %g v\n",
		 x2, y2, x3, y3);
    else if (x3 == x2 && y3 == y2)
	pprintg4(gdev_vector_stream(vdev), "%g %g %g %g y\n",
		 x1, y1, x2, y2);
    else
	pprintg6(gdev_vector_stream(vdev), "%g %g %g %g %g %g c\n",
		 x1, y1, x2, y2, x3, y3);
    return 0;
}

int
psdf_closepath(gx_device_vector * vdev, floatp x0, floatp y0,
	       floatp x_start, floatp y_start, gx_path_type_t type)
{
    stream_puts(gdev_vector_stream(vdev), "h\n");
    return 0;
}

/* endpath is deliberately omitted. */

/* ---------------- Utilities ---------------- */

gx_color_index
psdf_adjust_color_index(gx_device_vector *vdev, gx_color_index color)
{
    /*
     * Since gx_no_color_index is all 1's, we can't represent
     * a CMYK color consisting of full ink in all 4 components.
     * However, this color must be available for registration marks.
     * gxcmap.c fudges this by changing the K component to 254;
     * undo this fudge here.
     */
    return (color == (gx_no_color_index ^ 1) ? gx_no_color_index : color);
}

/*
 * Since we only have 8 bits of color to start with, round the
 * values to 3 digits for more compact output.
 */
private double
round_byte_color(int cv)
{
    return (int)(cv * (1000.0 / 255.0) + 0.5) / 1000.0;
}
int
psdf_set_color(gx_device_vector * vdev, const gx_drawing_color * pdc,
	       const psdf_set_color_commands_t *ppscc)
{
    const char *setcolor;

    if (!gx_dc_is_pure(pdc))
	return_error(gs_error_rangecheck);
    {
	stream *s = gdev_vector_stream(vdev);
	gx_color_index color =
	    psdf_adjust_color_index(vdev, gx_dc_pure_color(pdc));
	/*
	 * Normally we would precompute all of v0 .. v3, but gcc 2.7.2.3
	 * generates incorrect code for Intel CPUs if we do this.  The code
	 * below is longer, but does less computation in some cases.
	 */
	double v3 = round_byte_color(color & 0xff);

	switch (vdev->color_info.num_components) {
	case 4:
	    /* if (v0 == 0 && v1 == 0 && v2 == 0 && ...) */
	    if ((color & (0xffffff << 8)) == 0 && ppscc->setgray != 0) {
		v3 = 1.0 - v3;
		goto g;
	    }
	    pprintg4(s, "%g %g %g %g", round_byte_color(color >> 24),
		     round_byte_color((color >> 16) & 0xff),
		     round_byte_color((color >> 8) & 0xff), v3);
	    setcolor = ppscc->setcmykcolor;
	    break;
	case 3:
	    /* if (v1 == v2 && v2 == v3 && ...) */
	    if (!((color ^ (color >> 8)) & 0xffff) && ppscc->setgray != 0)
		goto g;
	    pprintg3(s, "%g %g %g", round_byte_color((color >> 16) & 0xff),
		     round_byte_color((color >> 8) & 0xff), v3);
	    setcolor = ppscc->setrgbcolor;
	    break;
	case 1:
	g:
	    pprintg1(s, "%g", v3);
	    setcolor = ppscc->setgray;
	    break;
	default:		/* can't happen */
	    return_error(gs_error_rangecheck);
	}
	if (setcolor)
	    pprints1(s, " %s\n", setcolor);
    }
    return 0;
}

/* ---------------- Binary data writing ---------------- */

/* Begin writing binary data. */
int
psdf_begin_binary(gx_device_psdf * pdev, psdf_binary_writer * pbw)
{
    gs_memory_t *mem = pbw->memory = pdev->v_memory;

    pbw->target = pdev->strm;
    pbw->dev = pdev;
    /* If not binary, set up the encoding stream. */
    if (!pdev->binary_ok) {
#define BUF_SIZE 100		/* arbitrary */
	byte *buf = gs_alloc_bytes(mem, BUF_SIZE, "psdf_begin_binary(buf)");
	stream_A85E_state *ss = (stream_A85E_state *)
	    s_alloc_state(mem, s_A85E_template.stype,
			  "psdf_begin_binary(stream_state)");
	stream *s = s_alloc(mem, "psdf_begin_binary(stream)");

	if (buf == 0 || ss == 0 || s == 0) {
	    gs_free_object(mem, s, "psdf_begin_binary(stream)");
	    gs_free_object(mem, ss, "psdf_begin_binary(stream_state)");
	    gs_free_object(mem, buf, "psdf_begin_binary(buf)");
	    return_error(gs_error_VMerror);
	}
	ss->template = &s_A85E_template;
	s_init_filter(s, (stream_state *)ss, buf, BUF_SIZE, pdev->strm);
#undef BUF_SIZE
	pbw->strm = pbw->A85E = s;
    } else {
	pbw->A85E = 0;		/* for GC */
	pbw->strm = pdev->strm;
    }
    return 0;
}

/* Add an encoding filter.  The client must have allocated the stream state, */
/* if any, using pdev->v_memory. */
int
psdf_encode_binary(psdf_binary_writer * pbw, const stream_template * template,
		   stream_state * ss)
{
    return (s_add_filter(&pbw->strm, template, ss, pbw->memory) == 0 ?
	    gs_note_error(gs_error_VMerror) : 0);
}

/*
 * Acquire parameters, and optionally set up the filter for, a DCTEncode
 * filter.  This is a separate procedure so it can be used to validate
 * filter parameters when they are set, rather than waiting until they are
 * used.  pbw = NULL means just set up the stream state.
 */
int
psdf_DCT_filter(gs_param_list *plist /* may be NULL */,
		stream_state /*stream_DCTE_state*/ *st,
		int Columns, int Rows, int Colors,
		psdf_binary_writer *pbw /* may be NULL */)
{
	stream_DCT_state *const ss = (stream_DCT_state *) st;
	gs_memory_t *mem = st->memory;
	jpeg_compress_data *jcdp;
	gs_c_param_list rcc_list;
	int code;

	/*
	 * "Wrap" the actual Dict or ACSDict parameter list in one that
	 * sets Rows, Columns, and Colors.
	 */
	gs_c_param_list_write(&rcc_list, mem);
	if ((code = param_write_int((gs_param_list *)&rcc_list, "Rows",
				    &Rows)) < 0 ||
	    (code = param_write_int((gs_param_list *)&rcc_list, "Columns",
				    &Columns)) < 0 ||
	    (code = param_write_int((gs_param_list *)&rcc_list, "Colors",
				    &Colors)) < 0
	    ) {
	    goto rcc_fail;
	}
	gs_c_param_list_read(&rcc_list);
	if (plist)
	    gs_c_param_list_set_target(&rcc_list, plist);
	/* Allocate space for IJG parameters. */
	jcdp = gs_alloc_struct_immovable(mem, jpeg_compress_data,
           &st_jpeg_compress_data, "zDCTE");
	if (jcdp == 0)
	    return_error(gs_error_VMerror);
	ss->data.compress = jcdp;
	jcdp->memory = ss->jpeg_memory = mem;	/* set now for allocation */
	if ((code = gs_jpeg_create_compress(ss)) < 0)
	    goto dcte_fail;	/* correct to do jpeg_destroy here */
	/* Read parameters from dictionary */
	s_DCTE_put_params((gs_param_list *)&rcc_list, ss); /* ignore errors */
	/* Create the filter. */
	jcdp->template = s_DCTE_template;
	/* Make sure we get at least a full scan line of input. */
	ss->scan_line_size = jcdp->cinfo.input_components *
	    jcdp->cinfo.image_width;
	jcdp->template.min_in_size =
	    max(s_DCTE_template.min_in_size, ss->scan_line_size);
	/* Make sure we can write the user markers in a single go. */
	jcdp->template.min_out_size =
	    max(s_DCTE_template.min_out_size, ss->Markers.size);
	if (pbw)
	    code = psdf_encode_binary(pbw, &jcdp->template, st);
	if (code >= 0) {
	    gs_c_param_list_release(&rcc_list);
	    return 0;
	}
    dcte_fail:
	gs_jpeg_destroy(ss);
	gs_free_object(mem, jcdp, "setup_image_compression");
    rcc_fail:
	gs_c_param_list_release(&rcc_list);
	return code;
}

/* Add a 2-D CCITTFax encoding filter. */
/* Set EndOfBlock iff the stream is not ASCII85 encoded. */
int
psdf_CFE_binary(psdf_binary_writer * pbw, int w, int h, bool invert)
{
    gs_memory_t *mem = pbw->memory;
    const stream_template *template = &s_CFE_template;
    stream_CFE_state *st =
	gs_alloc_struct(mem, stream_CFE_state, template->stype,
			"psdf_CFE_binary");
    int code;

    if (st == 0)
	return_error(gs_error_VMerror);
    (*template->set_defaults) ((stream_state *) st);
    st->K = -1;
    st->Columns = w;
    st->Rows = 0;
    st->BlackIs1 = !invert;
    st->EndOfBlock = pbw->strm->state->template != &s_A85E_template;
    code = psdf_encode_binary(pbw, template, (stream_state *) st);
    if (code < 0)
	gs_free_object(mem, st, "psdf_CFE_binary");
    return code;
}

/* Finish writing binary data. */
int
psdf_end_binary(psdf_binary_writer * pbw)
{
    int code = s_close_filters(&pbw->strm, pbw->target);

    /* s_close_filters freed the A85E stream, if any. */
    pbw->A85E = 0;		/* for GC */
    return code;
}
