/* Copyright (C) 2001-2006 Artifex Software, Inc.
   All Rights Reserved.
  
   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: gxpcmap.c 8106 2007-07-05 18:12:59Z tim $ */
/* Pattern color mapping for Ghostscript library */
#include "math_.h"
#include "memory_.h"
#include "gx.h"
#include "gserrors.h"
#include "gsstruct.h"
#include "gsutil.h"		/* for gs_next_ids */
#include "gxfixed.h"
#include "gxmatrix.h"
#include "gxcspace.h"		/* for gscolor2.h */
#include "gxcolor2.h"
#include "gxdcolor.h"
#include "gxdevice.h"
#include "gxdevmem.h"
#include "gxpcolor.h"
#include "gxp1impl.h"
#include "gxclist.h"
#include "gxcldev.h"
#include "gzstate.h"

/* Define the default size of the Pattern cache. */
#define max_cached_patterns_LARGE 50
#define max_pattern_bits_LARGE 100000
#define max_cached_patterns_SMALL 5
#define max_pattern_bits_SMALL 1000
uint
gx_pat_cache_default_tiles(void)
{
#if arch_small_memory
    return max_cached_patterns_SMALL;
#else
    return (gs_debug_c('.') ? max_cached_patterns_SMALL :
	    max_cached_patterns_LARGE);
#endif
}
ulong
gx_pat_cache_default_bits(void)
{
#if arch_small_memory
    return max_pattern_bits_SMALL;
#else
    return (gs_debug_c('.') ? max_pattern_bits_SMALL :
	    max_pattern_bits_LARGE);
#endif
}

/* Define the structures for Pattern rendering and caching. */
private_st_color_tile();
private_st_color_tile_element();
private_st_pattern_cache();
private_st_device_pattern_accum();

/* ------ Pattern rendering ------ */

/* Device procedures */
private dev_proc_open_device(pattern_accum_open);
private dev_proc_close_device(pattern_accum_close);
private dev_proc_fill_rectangle(pattern_accum_fill_rectangle);
private dev_proc_copy_mono(pattern_accum_copy_mono);
private dev_proc_copy_color(pattern_accum_copy_color);
private dev_proc_get_bits_rectangle(pattern_accum_get_bits_rectangle);

/* The device descriptor */
private const gx_device_pattern_accum gs_pattern_accum_device =
{std_device_std_body_open(gx_device_pattern_accum, 0,
			  "pattern accumulator",
			  0, 0, 72, 72),
 {
     /* NOTE: all drawing procedures must be defaulted, not forwarded. */
     pattern_accum_open,
     NULL,
     NULL,
     NULL,
     pattern_accum_close,
     NULL,
     NULL,
     pattern_accum_fill_rectangle,
     gx_default_tile_rectangle,
     pattern_accum_copy_mono,
     pattern_accum_copy_color,
     NULL,
     gx_default_get_bits,
     NULL,
     NULL,
     NULL,
     NULL,
     NULL,
     NULL,
     NULL,
     NULL,
     gx_default_copy_alpha,
     NULL,
     gx_default_copy_rop,
     gx_default_fill_path,
     gx_default_stroke_path,
     gx_default_fill_mask,
     gx_default_fill_trapezoid,
     gx_default_fill_parallelogram,
     gx_default_fill_triangle,
     gx_default_draw_thin_line,
     gx_default_begin_image,
     gx_default_image_data,
     gx_default_end_image,
     gx_default_strip_tile_rectangle,
     gx_default_strip_copy_rop,
     gx_get_largest_clipping_box,
     gx_default_begin_typed_image,
     pattern_accum_get_bits_rectangle,
     NULL,
     gx_default_create_compositor,
     NULL,
     gx_default_text_begin,
     gx_default_finish_copydevice,
     NULL,
     NULL,
     NULL,
     NULL,
     NULL,
     NULL,
     NULL,
     NULL,
     NULL
 },
 0,				/* target */
 0, 0, 0, 0			/* bitmap_memory, bits, mask, instance */
};


private int 
dummy_free_up_bandlist_memory(gx_device *cldev, bool b)
{
    return 0;
}

int 
pattern_clist_open_device(gx_device *dev)
{
    /* This function is defiled only for clist_init_bands. */
    return gs_clist_device_procs.open_device(dev);
}

private dev_proc_create_buf_device(dummy_create_buf_device)
{
    gx_device_memory *mdev = (gx_device_memory *)*pbdev;

    gs_make_mem_device(mdev, gdev_mem_device_for_bits(target->color_info.depth),
		mem, 0, target);
    return 0;
}
private dev_proc_size_buf_device(dummy_size_buf_device)
{
    return 0;
}
private dev_proc_setup_buf_device(dummy_setup_buf_device)
{
    return 0;
}
private dev_proc_destroy_buf_device(dummy_destroy_buf_device)
{
}

#define MAX_BITMAP_PATTERN_SIZE (1024*1024)

/* Allocate a pattern accumulator, with an initial refct of 0. */
gx_device_forward *
gx_pattern_accum_alloc(gs_memory_t * mem, gs_memory_t * storage_memory, 
		       gs_pattern1_instance_t *pinst, client_name_t cname)
{
    gx_device *tdev = pinst->saved->device;
    int depth = (pinst->template.PaintType == 1 ? 1 : tdev->color_info.depth);
    int raster = (pinst->size.x * depth + 7) / 8;
    int64_t size = (int64_t)raster * pinst->size.y;
    gx_device_forward *fdev;

    if (size < MAX_BITMAP_PATTERN_SIZE || pinst->template.PaintType != 1) {
	gx_device_pattern_accum *adev = gs_alloc_struct(mem, gx_device_pattern_accum,
			&st_device_pattern_accum, cname);

	if (adev == 0)
	    return 0;
	gx_device_init((gx_device *)adev,
		       (const gx_device *)&gs_pattern_accum_device,
		       mem, true);
	adev->instance = pinst;
	adev->bitmap_memory = storage_memory;
	fdev = (gx_device_forward *)adev;
    } else {
	gx_device_buf_procs_t buf_procs = {dummy_create_buf_device,
	dummy_size_buf_device, dummy_setup_buf_device, dummy_destroy_buf_device};
	gx_device_clist *cdev = gs_alloc_struct(mem, gx_device_clist,
			&st_device_clist, cname);
	gx_device_clist_writer *cwdev = (gx_device_clist_writer *)cdev;
	const int data_size = 1024*32;
	byte *data;

	if (cdev == 0)
	    return 0;
	/* We're not shure how big area do we need here.
	   Definitely we need 1 state in 'states'.
	   Not sure whether we need to create tile_cache, etc..
	   Note it is allocated in non-gc memory,
	   because the garbager descriptor for
	   gx_device_clist do not enumerate 'data'
	   and its subfields, assuming they do not relocate.
	   We place command list files to non-gc memory
	   due to same reason.
	 */
	data = gs_alloc_bytes(storage_memory->non_gc_memory, data_size, cname);
	if (data == NULL) {
	    gs_free_object(mem, cdev, cname);
	    return 0;
	}
	memset(cdev, 0, sizeof(*cdev));
	cwdev->params_size = sizeof(gx_device_clist);
	cwdev->static_procs = NULL;
	cwdev->dname = "pattern-clist";
	cwdev->memory = mem;
	cwdev->stype = &st_device_clist;
	cwdev->stype_is_dynamic = false;
	cwdev->finalize = NULL;
	rc_init(cwdev, mem, 1);
	cwdev->retained = true;
	cwdev->is_open = false;
	cwdev->max_fill_band = 0;
	cwdev->color_info = tdev->color_info;
	cwdev->cached_colors = tdev->cached_colors;
	cwdev->width = pinst->size.x;
	cwdev->height = pinst->size.y;
        cwdev->LeadingEdge = tdev->LeadingEdge;
	/* Fields left zeroed :
	float MediaSize[2];
	float ImagingBBox[4];
	bool ImagingBBox_set;
	*/
	cwdev->HWResolution[0] = tdev->HWResolution[0];
	cwdev->HWResolution[1] = tdev->HWResolution[1];
	/* Fields left zeroed :
	float MarginsHWResolution[2];
	float Margins[2];
	float HWMargins[4];
	long PageCount;
	long ShowpageCount;
	int NumCopies;
	bool NumCopies_set;
	bool IgnoreNumCopies;
	*/
	cwdev->UseCIEColor = tdev->UseCIEColor;
	cwdev->LockSafetyParams = true;
	/* gx_page_device_procs page_procs; */
	cwdev->procs = gs_clist_device_procs;
	cwdev->procs.open_device = pattern_clist_open_device;
	gx_device_copy_color_params((gx_device *)cwdev, tdev);
	cwdev->target = tdev;
	clist_init_io_procs(cdev, true);
	cwdev->data = data;
	cwdev->data_size = data_size;
	cwdev->buf_procs = buf_procs ;
	cwdev->band_params.page_uses_transparency = false;
	cwdev->band_params.BandWidth = pinst->size.x;
	cwdev->band_params.BandHeight = pinst->size.x;
	cwdev->band_params.BandBufferSpace = 0;
	cwdev->do_not_open_or_close_bandfiles = false;
	cwdev->bandlist_memory = storage_memory->non_gc_memory;
	cwdev->free_up_bandlist_memory = dummy_free_up_bandlist_memory;
	cwdev->disable_mask = 0;
	cwdev->page_uses_transparency = false;
	cwdev->pinst = pinst;
	fdev = (gx_device_forward *)cdev;
    }
    check_device_separable((gx_device *)fdev);
    gx_device_forward_fill_in_procs(fdev);
    return fdev;
}

/*
 * Initialize a pattern accumulator.
 * Client must already have set instance and bitmap_memory.
 *
 * Note that mask and bits accumulators are only created if necessary.
 */
private int
pattern_accum_open(gx_device * dev)
{
    gx_device_pattern_accum *const padev = (gx_device_pattern_accum *) dev;
    const gs_pattern1_instance_t *pinst = padev->instance;
    gs_memory_t *mem = padev->bitmap_memory;
    gx_device_memory *mask = 0;
    gx_device_memory *bits = 0;
    /*
     * The client should preset the target, because the device for which the
     * pattern is being rendered may not (in general, will not) be the same
     * as the one that was current when the pattern was instantiated.
     */
    gx_device *target =
	(padev->target == 0 ? gs_currentdevice(pinst->saved) :
	 padev->target);
    int width = pinst->size.x;
    int height = pinst->size.y;
    int code = 0;
    bool mask_open = false;

    /*
     * C's bizarre coercion rules force us to copy HWResolution in pieces
     * rather than using a single assignment.
     */
#define PDSET(dev)\
  ((dev)->width = width, (dev)->height = height,\
   /*(dev)->HWResolution = target->HWResolution*/\
   (dev)->HWResolution[0] = target->HWResolution[0],\
   (dev)->HWResolution[1] = target->HWResolution[1])

    PDSET(padev);
    padev->color_info = target->color_info;

    if (pinst->uses_mask) {
        mask = gs_alloc_struct( mem,
                                gx_device_memory,
                                &st_device_memory,
		                "pattern_accum_open(mask)"
                                );
        if (mask == 0)
	    return_error(gs_error_VMerror);
        gs_make_mem_mono_device(mask, mem, 0);
        PDSET(mask);
        mask->bitmap_memory = mem;
        mask->base = 0;
        code = (*dev_proc(mask, open_device)) ((gx_device *) mask);
        if (code >= 0) {
	    mask_open = true;
	    memset(mask->base, 0, mask->raster * mask->height);
	}
    }

    if (code >= 0) {
	switch (pinst->template.PaintType) {
	    case 2:		/* uncolored */
		gx_device_set_target((gx_device_forward *)padev, target);
		break;
	    case 1:		/* colored */
		bits = gs_alloc_struct(mem, gx_device_memory,
				       &st_device_memory,
				       "pattern_accum_open(bits)");
		if (bits == 0)
		    code = gs_note_error(gs_error_VMerror);
		else {
		    gs_make_mem_device(bits,
			gdev_mem_device_for_bits(target->color_info.depth),
				       mem, -1, target);
		    PDSET(bits);
#undef PDSET
		    bits->color_info = target->color_info;
		    bits->bitmap_memory = mem;
		    code = (*dev_proc(bits, open_device)) ((gx_device *) bits);
		    gx_device_set_target((gx_device_forward *)padev,
					 (gx_device *)bits);
		}
	}
    }
    if (code < 0) {
	if (bits != 0)
	    gs_free_object(mem, bits, "pattern_accum_open(bits)");
        if (mask != 0) {
	    if (mask_open)
		(*dev_proc(mask, close_device)) ((gx_device *) mask);
	    gs_free_object(mem, mask, "pattern_accum_open(mask)");
        }
	return code;
    }
    padev->mask = mask;
    padev->bits = bits;
    /* Retain the device, so it will survive anomalous grestores. */
    gx_device_retain(dev, true);
    return code;
}

/* Close an accumulator and free the bits. */
private int
pattern_accum_close(gx_device * dev)
{
    gx_device_pattern_accum *const padev = (gx_device_pattern_accum *) dev;
    gs_memory_t *mem = padev->bitmap_memory;

    /*
     * If bits != 0, it is the target of the device; reference counting
     * will close and free it.
     */
    gx_device_set_target((gx_device_forward *)padev, NULL);
    padev->bits = 0;
    if (padev->mask != 0) {
        (*dev_proc(padev->mask, close_device)) ((gx_device *) padev->mask);
        gs_free_object(mem, padev->mask, "pattern_accum_close(mask)");
        padev->mask = 0;
    }
    /* Un-retain the device now, so reference counting will free it. */
    gx_device_retain(dev, false);
    return 0;
}

/* Fill a rectangle */
private int
pattern_accum_fill_rectangle(gx_device * dev, int x, int y, int w, int h,
			     gx_color_index color)
{
    gx_device_pattern_accum *const padev = (gx_device_pattern_accum *) dev;

    if (padev->bits)
	(*dev_proc(padev->target, fill_rectangle))
	    (padev->target, x, y, w, h, color);
    if (padev->mask)
        return (*dev_proc(padev->mask, fill_rectangle))
	    ((gx_device *) padev->mask, x, y, w, h, (gx_color_index) 1);
     else
        return 0;
}

/* Copy a monochrome bitmap. */
private int
pattern_accum_copy_mono(gx_device * dev, const byte * data, int data_x,
		    int raster, gx_bitmap_id id, int x, int y, int w, int h,
			gx_color_index color0, gx_color_index color1)
{
    gx_device_pattern_accum *const padev = (gx_device_pattern_accum *) dev;

    /* opt out early if nothing to render (some may think this a bug) */
    if (color0 == gx_no_color_index && color1 == gx_no_color_index)
        return 0;
    if (padev->bits)
	(*dev_proc(padev->target, copy_mono))
	    (padev->target, data, data_x, raster, id, x, y, w, h,
	     color0, color1);
    if (padev->mask) {
        if (color0 != gx_no_color_index)
	    color0 = 1;
        if (color1 != gx_no_color_index)
	    color1 = 1;
        if (color0 == 1 && color1 == 1)
	    return (*dev_proc(padev->mask, fill_rectangle))
	        ((gx_device *) padev->mask, x, y, w, h, (gx_color_index) 1);
        else
	    return (*dev_proc(padev->mask, copy_mono))
	        ((gx_device *) padev->mask, data, data_x, raster, id, x, y, w, h,
	         color0, color1);
    } else
        return 0;
}

/* Copy a color bitmap. */
private int
pattern_accum_copy_color(gx_device * dev, const byte * data, int data_x,
		    int raster, gx_bitmap_id id, int x, int y, int w, int h)
{
    gx_device_pattern_accum *const padev = (gx_device_pattern_accum *) dev;

    if (padev->bits)
	(*dev_proc(padev->target, copy_color))
	    (padev->target, data, data_x, raster, id, x, y, w, h);
    if (padev->mask)
        return (*dev_proc(padev->mask, fill_rectangle))
	    ((gx_device *) padev->mask, x, y, w, h, (gx_color_index) 1);
    else
        return 0;
}

/* Read back a rectangle of bits. */
/****** SHOULD USE MASK TO DEFINE UNREAD AREA *****/
private int
pattern_accum_get_bits_rectangle(gx_device * dev, const gs_int_rect * prect,
		       gs_get_bits_params_t * params, gs_int_rect ** unread)
{
    gx_device_pattern_accum *const padev = (gx_device_pattern_accum *) dev;
    const gs_pattern1_instance_t *pinst = padev->instance;

    if (padev->bits)
	return (*dev_proc(padev->target, get_bits_rectangle))
	    (padev->target, prect, params, unread);

	if (pinst->template.PaintType == 2)
		return 0;
	else
		return_error(gs_error_Fatal); /* shouldn't happen */
}

/* ------ Color space implementation ------ */

/* Free all entries in a pattern cache. */
private bool
pattern_cache_choose_all(gx_color_tile * ctile, void *proc_data)
{
    return true;
}
private void
pattern_cache_free_all(gx_pattern_cache * pcache)
{
    gx_pattern_cache_winnow(pcache, pattern_cache_choose_all, NULL);
}

/* Allocate a Pattern cache. */
gx_pattern_cache *
gx_pattern_alloc_cache(gs_memory_t * mem, uint num_tiles, ulong max_bits)
{
    gx_pattern_cache *pcache =
    gs_alloc_struct(mem, gx_pattern_cache, &st_pattern_cache,
		    "gx_pattern_alloc_cache(struct)");
    gx_color_tile *tiles =
    gs_alloc_struct_array(mem, num_tiles, gx_color_tile,
			  &st_color_tile_element,
			  "gx_pattern_alloc_cache(tiles)");
    uint i;

    if (pcache == 0 || tiles == 0) {
	gs_free_object(mem, tiles, "gx_pattern_alloc_cache(tiles)");
	gs_free_object(mem, pcache, "gx_pattern_alloc_cache(struct)");
	return 0;
    }
    pcache->memory = mem;
    pcache->tiles = tiles;
    pcache->num_tiles = num_tiles;
    pcache->tiles_used = 0;
    pcache->next = 0;
    pcache->bits_used = 0;
    pcache->max_bits = max_bits;
    pcache->free_all = pattern_cache_free_all;
    for (i = 0; i < num_tiles; tiles++, i++) {
	tiles->id = gx_no_bitmap_id;
	/* Clear the pointers to pacify the GC. */
	uid_set_invalid(&tiles->uid);
	tiles->tbits.data = 0;
	tiles->tmask.data = 0;
	tiles->index = i;
	tiles->cdev = NULL;
    }
    return pcache;
}
/* Ensure that an imager has a Pattern cache. */
private int
ensure_pattern_cache(gs_imager_state * pis)
{
    if (pis->pattern_cache == 0) {
	gx_pattern_cache *pcache =
	gx_pattern_alloc_cache(pis->memory,
			       gx_pat_cache_default_tiles(),
			       gx_pat_cache_default_bits());

	if (pcache == 0)
	    return_error(gs_error_VMerror);
	pis->pattern_cache = pcache;
    }
    return 0;
}

/* Get and set the Pattern cache in a gstate. */
gx_pattern_cache *
gstate_pattern_cache(gs_state * pgs)
{
    return pgs->pattern_cache;
}
void
gstate_set_pattern_cache(gs_state * pgs, gx_pattern_cache * pcache)
{
    pgs->pattern_cache = pcache;
}

/* Free a Pattern cache entry. */
private void
gx_pattern_cache_free_entry(gx_pattern_cache * pcache, gx_color_tile * ctile)
{
    if ((ctile->id != gx_no_bitmap_id) && !ctile->is_dummy) {
	gs_memory_t *mem = pcache->memory;
	gx_device_memory mdev;
	ulong used = 0;

	/*
	 * We must initialize the memory device properly, even though
	 * we aren't using it for drawing.
	 */
	gs_make_mem_mono_device(&mdev, mem, NULL);
	if (ctile->tmask.data != 0) {
	    mdev.width = ctile->tmask.size.x;
	    mdev.height = ctile->tmask.size.y;
	    /*mdev.color_info.depth = 1;*/
	    gdev_mem_bitmap_size(&mdev, &used);
	    gs_free_object(mem, ctile->tmask.data,
			   "free_pattern_cache_entry(mask data)");
	    ctile->tmask.data = 0;	/* for GC */
	}
	if (ctile->tbits.data != 0) {
	    ulong tbits_used = 0;

	    mdev.width = ctile->tbits.size.x;
	    mdev.height = ctile->tbits.size.y;
	    mdev.color_info.depth = ctile->depth;
	    gdev_mem_bitmap_size(&mdev, &tbits_used);
	    used += tbits_used;
	    gs_free_object(mem, ctile->tbits.data,
			   "free_pattern_cache_entry(bits data)");
	    ctile->tbits.data = 0;	/* for GC */
	}
	if (ctile->cdev != NULL) {
	    dev_proc(&ctile->cdev->common, close_device)((gx_device *)&ctile->cdev->common);
	    ctile->cdev = NULL;
	}
	pcache->tiles_used--;
	pcache->bits_used -= used;
	ctile->id = gx_no_bitmap_id;
    }
}

/*
 * Add a Pattern cache entry.  This is exported for the interpreter.
 * Note that this does not free any of the data in the accumulator
 * device, but it may zero out the bitmap_memory pointers to prevent
 * the accumulated bitmaps from being freed when the device is closed.
 */
private void make_bitmap(gx_strip_bitmap *, const gx_device_memory *, gx_bitmap_id);
int
gx_pattern_cache_add_entry(gs_imager_state * pis,
		   gx_device_forward * fdev, gx_color_tile ** pctile)
{
    gx_pattern_cache *pcache;
    const gs_pattern1_instance_t *pinst;
    ulong used = 0, mask_used = 0;
    gx_bitmap_id id;
    gx_color_tile *ctile;
    int code = ensure_pattern_cache(pis);
    extern dev_proc_open_device(pattern_clist_open_device);
    gx_device_memory *mmask = NULL;
    gx_device_memory *mbits = NULL;

    if (code < 0)
	return code;
    pcache = pis->pattern_cache;
    if (fdev->procs.open_device != pattern_clist_open_device) {
	gx_device_pattern_accum *padev = (gx_device_pattern_accum *)fdev;
	
	mbits = padev->bits;
	mmask = padev->mask;
	pinst = padev->instance;
	/*
	 * Check whether the pattern completely fills its box.
	 * If so, we can avoid the expensive masking operations
	 * when using the pattern.
	 */
	if (mmask != 0) {
	    int y;

	    for (y = 0; y < mmask->height; y++) {
		const byte *row = scan_line_base(mmask, y);
		int w;

		for (w = mmask->width; w > 8; w -= 8)
		    if (*row++ != 0xff)
			goto keep;
		if ((*row | (0xff >> w)) != 0xff)
		    goto keep;
	    }
	    /* We don't need a mask. */
	    mmask = 0;
	  keep:;
	}
	if (mbits != 0)
	    gdev_mem_bitmap_size(mbits, &used);
	if (mmask != 0) {
	    gdev_mem_bitmap_size(mmask, &mask_used);
	    used += mask_used;
	}
    } else {
	gx_device_clist *cdev = (gx_device_clist *)fdev;
	gx_device_clist_writer * cldev = (gx_device_clist_writer *)cdev;

	code = clist_end_page(cldev);
	if (code < 0)
	    return code;
	pinst = cdev->writer.pinst;
	/* HACK: we would like to copy the pattern clist stream into the 
	   tile cache memory and properly account its size,
	   but we have no time for this development now.
	   Therefore the stream is stored outside the cache. */
	used = 0;
    }
    id = pinst->id;
    ctile = &pcache->tiles[id % pcache->num_tiles];
    gx_pattern_cache_free_entry(pcache, ctile);
    while (pcache->bits_used + used > pcache->max_bits &&
	   pcache->bits_used != 0	/* allow 1 oversized entry (?) */
	) {
	pcache->next = (pcache->next + 1) % pcache->num_tiles;
	gx_pattern_cache_free_entry(pcache, &pcache->tiles[pcache->next]);
    }
    ctile->id = id;
    ctile->depth = fdev->color_info.depth;
    ctile->uid = pinst->template.uid;
    ctile->tiling_type = pinst->template.TilingType;
    ctile->step_matrix = pinst->step_matrix;
    ctile->bbox = pinst->bbox;
    ctile->is_simple = pinst->is_simple;
    ctile->is_dummy = false;
    if (fdev->procs.open_device != pattern_clist_open_device) {
	if (mbits != 0) {
	    make_bitmap(&ctile->tbits, mbits, gs_next_ids(pis->memory, 1));
	    mbits->bitmap_memory = 0;	/* don't free the bits */
	} else
	    ctile->tbits.data = 0;
	if (mmask != 0) {
	    make_bitmap(&ctile->tmask, mmask, id);
	    mmask->bitmap_memory = 0;	/* don't free the bits */
	} else
	    ctile->tmask.data = 0;
	ctile->cdev = NULL;
	pcache->bits_used += used;
    } else {
	gx_device_clist *cdev = (gx_device_clist *)fdev;
	gx_device_clist_writer *cwdev = (gx_device_clist_writer *)fdev;

	ctile->tbits.data = 0;
	ctile->tbits.size.x = 0;
	ctile->tbits.size.y = 0;
	ctile->tmask.data = 0;
	ctile->tmask.size.x = 0;
	ctile->tmask.size.y = 0;
	ctile->cdev = cdev;
#if 0 /* Don't free - tile cache is used by clist reader. */
	gs_free_object(cwdev->bandlist_memory, cwdev->data, "gx_pattern_cache_add_entry");
	cwdev->data = NULL;
	cwdev->states = NULL;
	cwdev->cbuf = NULL;
	cwdev->cnext = NULL;
	cwdev->cend = NULL;
	cwdev->ccl = NULL;
#endif
	/* Prevent freeing files on pattern_paint_cleanup : */
	cwdev->do_not_open_or_close_bandfiles = true;
    }
    pcache->tiles_used++;
    *pctile = ctile;
    return 0;
}

bool 
gx_pattern_tile_is_clist(gx_color_tile *ptile)
{
    return ptile != NULL && ptile->cdev != NULL;
}

/* Add a dummy Pattern cache entry.  Stubs a pattern tile for interpreter when
   device handles high level patterns. */
int
gx_pattern_cache_add_dummy_entry(gs_imager_state *pis, 
	    gs_pattern1_instance_t *pinst, int depth)
{
    gx_color_tile *ctile;
    gx_pattern_cache *pcache;
    gx_bitmap_id id = pinst->id;
    int code = ensure_pattern_cache(pis);

    if (code < 0)
	return code;
    pcache = pis->pattern_cache;
    ctile = &pcache->tiles[id % pcache->num_tiles];
    gx_pattern_cache_free_entry(pcache, ctile);
    ctile->id = id;
    ctile->depth = depth;
    ctile->uid = pinst->template.uid;
    ctile->tiling_type = pinst->template.TilingType;
    ctile->step_matrix = pinst->step_matrix;
    ctile->bbox = pinst->bbox;
    ctile->is_simple = pinst->is_simple;
    ctile->is_dummy = true;
    memset(&ctile->tbits, 0 , sizeof(ctile->tbits));
    ctile->tbits.size = pinst->size;
    ctile->tbits.id = gs_no_bitmap_id;
    memset(&ctile->tmask, 0 , sizeof(ctile->tmask));
    ctile->cdev = NULL;
    pcache->tiles_used++;
    return 0;
}
private void
make_bitmap(register gx_strip_bitmap * pbm, const gx_device_memory * mdev,
	    gx_bitmap_id id)
{
    pbm->data = mdev->base;
    pbm->raster = mdev->raster;
    pbm->rep_width = pbm->size.x = mdev->width;
    pbm->rep_height = pbm->size.y = mdev->height;
    pbm->id = id;
    pbm->rep_shift = pbm->shift = 0;
}

/* Purge selected entries from the pattern cache. */
void
gx_pattern_cache_winnow(gx_pattern_cache * pcache,
  bool(*proc) (gx_color_tile * ctile, void *proc_data), void *proc_data)
{
    uint i;

    if (pcache == 0)		/* no cache created yet */
	return;
    for (i = 0; i < pcache->num_tiles; ++i) {
	gx_color_tile *ctile = &pcache->tiles[i];

	if (ctile->id != gx_no_bitmap_id && (*proc) (ctile, proc_data))
	    gx_pattern_cache_free_entry(pcache, ctile);
    }
}

/* Reload a (non-null) Pattern color into the cache. */
/* *pdc is already set, except for colors.pattern.p_tile and mask.m_tile. */
int
gx_pattern_load(gx_device_color * pdc, const gs_imager_state * pis,
		gx_device * dev, gs_color_select_t select)
{
    gx_device_forward *adev;
    gs_pattern1_instance_t *pinst =
	(gs_pattern1_instance_t *)pdc->ccolor.pattern;
    gs_state *saved;
    gx_color_tile *ctile;
    gs_memory_t *mem = pis->memory;
    int code;

    if (gx_pattern_cache_lookup(pdc, pis, dev, select))
	return 0;
    /* We REALLY don't like the following cast.... */
    code = ensure_pattern_cache((gs_imager_state *) pis);
    if (code < 0)
	return code;
    /*
     * Note that adev is an internal device, so it will be freed when the
     * last reference to it from a graphics state is deleted.
     */
    adev = gx_pattern_accum_alloc(mem, pis->pattern_cache->memory, pinst, "gx_pattern_load");
    if (adev == 0)
	return_error(gs_error_VMerror);
    gx_device_set_target((gx_device_forward *)adev, dev);
    code = dev_proc(adev, open_device)((gx_device *)adev);
    if (code < 0)
	goto fail;
    saved = gs_gstate(pinst->saved);
    if (saved == 0) {
	code = gs_note_error(gs_error_VMerror);
	goto fail;
    }
    if (saved->pattern_cache == 0)
	saved->pattern_cache = pis->pattern_cache;
    gs_setdevice_no_init(saved, (gx_device *)adev);
    code = (*pinst->template.PaintProc)(&pdc->ccolor, saved);
    if (code < 0) {
	dev_proc(adev, close_device)((gx_device *)adev);
	/* Freeing the state will free the device. */
	gs_state_free(saved);
	return code;
    }
    /* We REALLY don't like the following cast.... */
    code = gx_pattern_cache_add_entry((gs_imager_state *)pis, 
		adev, &ctile);
    if (code >= 0) {
	if (!gx_pattern_cache_lookup(pdc, pis, dev, select)) {
	    lprintf("Pattern cache lookup failed after insertion!\n");
	    code = gs_note_error(gs_error_Fatal);
	}
    }
#ifdef DEBUG
    if (gs_debug_c('B') && adev->procs.open_device == pattern_accum_open) {
	gx_device_pattern_accum *pdev = (gx_device_pattern_accum *)adev;

        if (pdev->mask)
	    debug_dump_bitmap(pdev->mask->base, pdev->mask->raster,
			      pdev->mask->height, "[B]Pattern mask");
	if (pdev->bits)
	    debug_dump_bitmap(((gx_device_memory *) pdev->target)->base,
			      ((gx_device_memory *) pdev->target)->raster,
			      pdev->target->height, "[B]Pattern bits");
    }
#endif
    /* Free the bookkeeping structures, except for the bits and mask */
    /* data iff they are still needed. */
    dev_proc(adev, close_device)((gx_device *)adev);
    /* Free the chain of gstates. Freeing the state will free the device. */
    gs_state_free_chain(saved);
    return code;
fail:
    if (adev->procs.open_device == pattern_clist_open_device) {
	gx_device_clist *cdev = (gx_device_clist *)adev;

	gs_free_object(cdev->writer.bandlist_memory, cdev->common.data, "gx_pattern_load");
	cdev->common.data = 0;
    }
    gs_free_object(mem, adev, "gx_pattern_load");
    return code;
}

/* Remap a PatternType 1 color. */
cs_proc_remap_color(gx_remap_Pattern);	/* check the prototype */
int
gs_pattern1_remap_color(const gs_client_color * pc, const gs_color_space * pcs,
			gx_device_color * pdc, const gs_imager_state * pis,
			gx_device * dev, gs_color_select_t select)
{
    gs_pattern1_instance_t *pinst = (gs_pattern1_instance_t *)pc->pattern;
    int code;

    /* Save original color space and color info into dev color */
    pdc->ccolor = *pc;
    pdc->ccolor_valid = true;
    if (pinst == 0) {
	/* Null pattern */
	color_set_null_pattern(pdc);
	return 0;
    }
    if (pinst->template.PaintType == 2) {	/* uncolored */
	code = (pcs->base_space->type->remap_color)
	    (pc, pcs->base_space, pdc, pis, dev, select);
	if (code < 0)
	    return code;
	if (pdc->type == gx_dc_type_pure)
	    pdc->type = &gx_dc_pure_masked;
	else if (pdc->type == gx_dc_type_ht_binary)
	    pdc->type = &gx_dc_binary_masked;
	else if (pdc->type == gx_dc_type_ht_colored)
	    pdc->type = &gx_dc_colored_masked;
	else
	    return_error(gs_error_unregistered);
    } else
	color_set_null_pattern(pdc);
    pdc->mask.id = pinst->id;
    pdc->mask.m_tile = 0;
    return gx_pattern_load(pdc, pis, dev, select);
}