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  This file is part of AFPL Ghostscript.
  
  AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author or
  distributor accepts any responsibility for the consequences of using it, or
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  she says so in writing.  Refer to the Aladdin Free Public License (the
  "License") for full details.
  
  Every copy of AFPL Ghostscript must include a copy of the License, normally
  in a plain ASCII text file named PUBLIC.  The License grants you the right
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*/

/*$Id: zmedia2.c,v 1.2 2000/09/19 19:00:54 lpd Exp $ */
/* Media matching for setpagedevice */
#include "math_.h"
#include "memory_.h"
#include "ghost.h"
#include "gsmatrix.h"
#include "oper.h"
#include "idict.h"
#include "idparam.h"
#include "iname.h"
#include "store.h"

/* <pagedict> <attrdict> <policydict> <keys> .matchmedia <key> true */
/* <pagedict> <attrdict> <policydict> <keys> .matchmedia false */
/* <pagedict> null <policydict> <keys> .matchmedia null true */
private int zmatch_page_size(P8(const ref * pvreq, const ref * pvmed,
				int policy, int orient, bool roll,
				float *best_mismatch, gs_matrix * pmat,
				gs_point * pmsize));
typedef struct match_record_s {
    ref best_key, match_key;
    uint priority, no_match_priority;
} match_record_t;
private void
reset_match(match_record_t *match)
{
    make_null(&match->best_key);
    make_null(&match->match_key);
    match->priority = match->no_match_priority;
}
private int
zmatchmedia(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    os_ptr preq = op - 3;
    os_ptr pattr = op - 2;
    os_ptr ppol = op - 1;
    os_ptr pkeys = op;		/* *const */
    int policy_default;
    float best_mismatch = (float)max_long;	/* adhoc */
    float mbest = best_mismatch;
    match_record_t match;
    ref no_priority;
    ref *ppriority;
    int mepos, orient;
    bool roll;
    int code;
    int ai;
    struct mkd_ {
	ref key, dict;
    } aelt;
    if (r_has_type(pattr, t_null)) {
	check_op(4);
	make_null(op - 3);
	make_true(op - 2);
	pop(2);
	return 0;
    }
    check_type(*preq, t_dictionary);
    check_dict_read(*preq);
    check_type(*pattr, t_dictionary);
    check_dict_read(*pattr);
    check_type(*ppol, t_dictionary);
    check_dict_read(*ppol);
    check_array(*pkeys);
    check_read(*pkeys);
    switch (code = dict_int_null_param(preq, "MediaPosition", 0, 0x7fff,
				       0, &mepos)) {
	default:
	    return code;
	case 2:
	case 1:
	    mepos = -1;
	case 0:;
    }
    switch (code = dict_int_null_param(preq, "Orientation", 0, 3,
				       0, &orient)) {
	default:
	    return code;
	case 2:
	case 1:
	    orient = -1;
	case 0:;
    }
    code = dict_bool_param(preq, "RollFedMedia", false, &roll);
    if (code < 0)
	return code;
    code = dict_int_param(ppol, "PolicyNotFound", 0, 7, 0,
			  &policy_default);
    if (code < 0)
	return code;
    if (dict_find_string(pattr, "Priority", &ppriority) > 0) {
	check_array_only(*ppriority);
	check_read(*ppriority);
    } else {
	make_empty_array(&no_priority, a_readonly);
	ppriority = &no_priority;
    }
    match.no_match_priority = r_size(ppriority);
    reset_match(&match);
    for (ai = dict_first(pattr);
	 (ai = dict_next(pattr, ai, (ref * /*[2]*/)&aelt)) >= 0;
	 ) {
	if (r_has_type(&aelt.dict, t_dictionary) &&
	    r_has_attr(dict_access_ref(&aelt.dict), a_read) &&
	    r_has_type(&aelt.key, t_integer) &&
	    (mepos < 0 || aelt.key.value.intval == mepos)
	    ) {
	    bool match_all;
	    uint ki, pi;

	    code = dict_bool_param(&aelt.dict, "MatchAll", false,
				   &match_all);
	    if (code < 0)
		return code;
	    for (ki = 0; ki < r_size(pkeys); ki++) {
		ref key;
		ref kstr;
		ref *prvalue;
		ref *pmvalue;
		ref *ppvalue;
		int policy;

		array_get(pkeys, ki, &key);
		if (dict_find(&aelt.dict, &key, &pmvalue) <= 0)
		    continue;
		if (dict_find(preq, &key, &prvalue) <= 0 ||
		    r_has_type(prvalue, t_null)
		    ) {
		    if (match_all)
			goto no;
		    else
			continue;
		}
		/* Look for the Policies entry for this key. */
		if (dict_find(ppol, &key, &ppvalue) > 0) {
		    check_type_only(*ppvalue, t_integer);
		    policy = ppvalue->value.intval;
		} else
		    policy = policy_default;
	/*
	 * Match a requested attribute value with the attribute value in the
	 * description of a medium.  For all attributes except PageSize,
	 * matching means equality.  PageSize is special; see match_page_size
	 * below.
	 */
		if (r_has_type(&key, t_name) &&
		    (name_string_ref(&key, &kstr),
		     r_size(&kstr) == 8 &&
		     !memcmp(kstr.value.bytes, "PageSize", 8))
		    ) {
		    gs_matrix ignore_mat;
		    gs_point ignore_msize;

		    if (zmatch_page_size(prvalue, pmvalue,
					 policy, orient, roll,
					 &best_mismatch,
					 &ignore_mat,
					 &ignore_msize)
			<= 0)
			goto no;
		} else if (!obj_eq(prvalue, pmvalue))
		    goto no;
	    }
	    /* We have a match.  If it is a better match */
	    /* than the current best one, it supersedes it */
	    /* regardless of priority. */
	    if (best_mismatch < mbest) {
		mbest = best_mismatch;
		reset_match(&match);
	    }
	    /* In case of a tie, see if the new match has */
	    /* priority. */
	    for (pi = match.priority; pi > 0;) {
		ref pri;

		pi--;
		array_get(ppriority, pi, &pri);
		if (obj_eq(&aelt.key, &pri)) {	/* Yes, higher priority. */
		    match.best_key = aelt.key;
		    match.priority = pi;
		    break;
		}
	    }
	    /* Save the match in case no match has priority. */
	    match.match_key = aelt.key;
no:;
	}
    }
    if (r_has_type(&match.match_key, t_null)) {
	make_false(op - 3);
	pop(3);
    } else {
	if (r_has_type(&match.best_key, t_null))
	    op[-3] = match.match_key;
	else
	    op[-3] = match.best_key;
	make_true(op - 2);
	pop(2);
    }
    return 0;
}

/* [<req_x> <req_y>] [<med_x0> <med_y0> (<med_x1> <med_y1> | )]
 *     <policy> <orient|null> <roll> <matrix|null> .matchpagesize
 *   <matrix|null> <med_x> <med_y> true   -or-  false
 */
private int
zmatchpagesize(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_matrix mat;
    float ignore_mismatch = (float)max_long;
    gs_point media_size;
    int orient;
    bool roll;
    int code;

    check_type(op[-3], t_integer);
    if (r_has_type(op - 2, t_null))
	orient = -1;
    else {
	check_int_leu(op[-2], 3);
	orient = (int)op[-2].value.intval;
    }
    check_type(op[-1], t_boolean);
    roll = op[-1].value.boolval;
    code = zmatch_page_size(op - 5, op - 4, (int)op[-3].value.intval,
			    orient, roll,
			    &ignore_mismatch, &mat, &media_size);
    switch (code) {
	default:
	    return code;
	case 0:
	    make_false(op - 5);
	    pop(5);
	    break;
	case 1:
	    code = write_matrix(op, &mat);
	    if (code < 0 && !r_has_type(op, t_null))
		return code;
	    op[-5] = *op;
	    make_real(op - 4, media_size.x);
	    make_real(op - 3, media_size.y);
	    make_true(op - 2);
	    pop(2);
	    break;
    }
    return 0;
}
/* Match the PageSize.  See below for details. */
private bool match_page_size(P8(const gs_point * request,
				const gs_rect * medium,
				int policy, int orient, bool roll,
				float *best_mismatch, gs_matrix * pmat,
				gs_point * pmsize));
private int
zmatch_page_size(const ref * pvreq, const ref * pvmed,
		 int policy, int orient, bool roll,
		 float *best_mismatch, gs_matrix * pmat, gs_point * pmsize)
{
    uint nr, nm;

    check_array(*pvreq);
    nr = r_size(pvreq);
    check_array(*pvmed);
    nm = r_size(pvmed);
    if (!((nm == 2 || nm == 4) && (nr == 2 || nr == nm)))
	return_error(e_rangecheck);
    {
	ref rv[6];
	uint i;
	double v[6];
	int code;

	array_get(pvreq, 0, &rv[0]);
	array_get(pvreq, 1, &rv[1]);
	for (i = 0; i < 4; ++i)
	    array_get(pvmed, i % nm, &rv[i + 2]);
	if ((code = num_params(rv + 5, 6, v)) < 0)
	    return code;
	{
	    gs_point request;
	    gs_rect medium;

	    request.x = v[0], request.y = v[1];
	    medium.p.x = v[2], medium.p.y = v[3],
		medium.q.x = v[4], medium.q.y = v[5];
	    return match_page_size(&request, &medium, policy, orient,
				   roll, best_mismatch, pmat, pmsize);
	}
    }
}
/*
 * Match a requested PageSize with the PageSize of a medium.  The medium
 * may specify either a single value [mx my] or a range
 * [mxmin mymin mxmax mymax]; matching means equality or inclusion
 * to within a tolerance of 5, possibly swapping the requested X and Y.
 * Take the Policies value into account, keeping track of the discrepancy
 * if needed.  When a match is found, also return the matrix to be
 * concatenated after setting up the default matrix, and the actual
 * media size.
 *
 * NOTE: The algorithm here doesn't work properly for variable-size media
 * when the match isn't exact.  We'll fix it if we ever need to.
 */
private void make_adjustment_matrix(P5(const gs_point * request,
				       const gs_rect * medium,
				       gs_matrix * pmat,
				       bool scale, int rotate));
private bool
match_page_size(const gs_point * request, const gs_rect * medium, int policy,
		int orient, bool roll, float *best_mismatch, gs_matrix * pmat,
		gs_point * pmsize)
{
    double rx = request->x, ry = request->y;

    if (policy == 7) {
		/* (Adobe) hack: just impose requested values */
	*best_mismatch = 0;
	gs_make_identity(pmat);
	*pmsize = *request;
	return true;
    }
    if (rx - medium->p.x >= -5 && rx - medium->q.x <= 5 &&
	ry - medium->p.y >= -5 && ry - medium->q.y <= 5 &&
	(orient < 0 || !(orient & 1))
	) {
	*best_mismatch = 0;
	make_adjustment_matrix(request, medium, pmat, false,
			       (orient >= 0 ? orient : 0));
    } else if (rx - medium->p.y >= -5 && rx - medium->q.y <= 5 &&
	       ry - medium->p.x >= -5 && ry - medium->q.x <= 5 &&
	       (orient < 0 || (orient & 1))
	) {
	*best_mismatch = 0;
	make_adjustment_matrix(request, medium, pmat, false,
			       (orient >= 0 ? orient :
				rx < ry ? -1 : 1));
    } else {
	int rotate =
	(orient >= 0 ? orient :
	 rx < ry ?
	 (medium->q.x > medium->q.y ? -1 : 0) :
	 (medium->q.x < medium->q.y ? 1 : 0));
	bool larger =
	(rotate ? medium->q.y >= rx && medium->q.x >= ry :
	 medium->q.x >= rx && medium->q.y >= ry);
	bool adjust = false;
	float mismatch = medium->q.x * medium->q.y - rx * ry;

	switch (policy) {
	    default:		/* exact match only */
		return false;
	    case 3:		/* nearest match, adjust */
		adjust = true;
	    case 5:		/* nearest match, don't adjust */
		if (fabs(mismatch) >= fabs(*best_mismatch))
		    return false;
		break;
	    case 4:		/* next larger match, adjust */
		adjust = true;
	    case 6:		/* next larger match, don't adjust */
		if (!larger || mismatch >= *best_mismatch)
		    return false;
		break;
	}
	if (adjust)
	    make_adjustment_matrix(request, medium, pmat, !larger, rotate);
	else {
	    gs_rect req_rect;

	    req_rect.p = *request;
	    req_rect.q = *request;
	    make_adjustment_matrix(request, &req_rect, pmat, false, rotate);
	}
	*best_mismatch = mismatch;
    }
    if (pmat->xx == 0) {	/* Swap request X and Y. */
	double temp = rx;

	rx = ry, ry = temp;
    }
#define ADJUST_INTO(req, mmin, mmax)\
  (req < mmin ? mmin : req > mmax ? mmax : req)
    pmsize->x = ADJUST_INTO(rx, medium->p.x, medium->q.x);
    pmsize->y = ADJUST_INTO(ry, medium->p.y, medium->q.y);
#undef ADJUST_INTO
    return true;
}
/*
 * Compute the adjustment matrix for scaling and/or rotating the page
 * to match the medium.  If the medium is completely flexible in a given
 * dimension (e.g., roll media in one dimension, or displays in both),
 * we must adjust its size in that dimension to match the request.
 * We recognize this by an unreasonably small medium->p.{x,y}.
 */
#define MIN_MEDIA_SIZE 9
private void
make_adjustment_matrix(const gs_point * request, const gs_rect * medium,
		       gs_matrix * pmat, bool scale, int rotate)
{
    double rx = request->x, ry = request->y;
    double mx = medium->q.x, my = medium->q.y;

    /* Rotate the request if necessary. */
    if (rotate & 1) {
	double temp = rx;

	rx = ry, ry = temp;
    }
    /* Adjust the medium size if flexible. */
    if (medium->p.x < MIN_MEDIA_SIZE && mx > rx)
	mx = rx;
    if (medium->p.y < MIN_MEDIA_SIZE && my > ry)
	my = ry;

    /* Translate to align the centers. */
    gs_make_translation(mx / 2, my / 2, pmat);

    /* Rotate if needed. */
    if (rotate)
	gs_matrix_rotate(pmat, 90.0 * rotate, pmat);

    /* Scale if needed. */
    if (scale) {
	double xfactor = mx / rx;
	double yfactor = my / ry;
	double factor = min(xfactor, yfactor);

	if (factor < 1)
	    gs_matrix_scale(pmat, factor, factor, pmat);
    }
    /* Now translate the origin back, */
    /* using the original, unswapped request. */
    gs_matrix_translate(pmat, -request->x / 2, -request->y / 2, pmat);
}
#undef MIN_MEDIA_SIZE

/* ------ Initialization procedure ------ */

const op_def zmedia2_l2_op_defs[] =
{
    op_def_begin_level2(),
    {"4.matchmedia", zmatchmedia},
    {"6.matchpagesize", zmatchpagesize},
    op_def_end(0)
};
