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- /* Copyright (C) 1989, 1995, 1996, 1997, 1999 Aladdin Enterprises. All rights reserved.
-
- 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
- for whether it serves any particular purpose or works at all, unless he or
- 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
- to copy, modify and redistribute AFPL Ghostscript, but only under certain
- conditions described in the License. Among other things, the License
- requires that the copyright notice and this notice be preserved on all
- copies.
- */
-
- /*$Id: gxccman.c,v 1.2 2000/09/19 19:00:33 lpd Exp $ */
- /* Character cache management routines for Ghostscript library */
- #include "gx.h"
- #include "memory_.h"
- #include "gpcheck.h"
- #include "gserrors.h"
- #include "gsstruct.h"
- #include "gsbitops.h"
- #include "gsutil.h" /* for gs_next_ids */
- #include "gxfixed.h"
- #include "gxmatrix.h"
- #include "gzstate.h"
- #include "gxpath.h"
- #include "gxdevice.h"
- #include "gxdevmem.h"
- #include "gxchar.h"
- #include "gxfont.h"
- #include "gxfcache.h"
- #include "gxxfont.h"
-
- /* Define the descriptors for the cache structures. */
- private_st_cached_fm_pair();
- private_st_cached_fm_pair_elt();
- /*private_st_cached_char(); *//* unused */
- private_st_cached_char_ptr(); /* unused */
- private_st_cached_char_ptr_elt();
- /*
- * Define a descriptor for the cache data. This is equivalent to st_bytes,
- * but it identifies the cache data as such in a memory dump.
- */
- gs_private_st_simple(st_font_cache_bytes, byte, "font cache bytes");
- /* GC procedures */
- /* We do all the work in font_dir_enum/reloc_ptrs in gsfont.c. */
- /* See gxfcache.h for details. */
- private
- ENUM_PTRS_BEGIN(cc_ptr_enum_ptrs) return 0;
-
- ENUM_PTRS_END
- private RELOC_PTRS_BEGIN(cc_ptr_reloc_ptrs)
- {
- }
- RELOC_PTRS_END
-
- /* Forward references */
- private gx_xfont * lookup_xfont_by_name(P6(gx_device *, const gx_xfont_procs *, gs_font_name *, int, const cached_fm_pair *, const gs_matrix *));
- private cached_char *alloc_char(P2(gs_font_dir *, ulong));
- private cached_char *alloc_char_in_chunk(P2(gs_font_dir *, ulong));
- private void hash_remove_cached_char(P2(gs_font_dir *, uint));
- private void shorten_cached_char(P3(gs_font_dir *, cached_char *, uint));
-
- /* ====== Initialization ====== */
-
- /* Allocate and initialize the character cache elements of a font directory. */
- int
- gx_char_cache_alloc(gs_memory_t * struct_mem, gs_memory_t * bits_mem,
- gs_font_dir * pdir, uint bmax, uint mmax, uint cmax, uint upper)
- { /* Since we use open hashing, we must increase cmax somewhat. */
- uint chsize = (cmax + (cmax >> 1)) | 31;
- cached_fm_pair *mdata;
- cached_char **chars;
-
- /* Round up chsize to a power of 2. */
- while (chsize & (chsize + 1))
- chsize |= chsize >> 1;
- chsize++;
- mdata = gs_alloc_struct_array(struct_mem, mmax, cached_fm_pair,
- &st_cached_fm_pair_element,
- "font_dir_alloc(mdata)");
- chars = gs_alloc_struct_array(struct_mem, chsize, cached_char *,
- &st_cached_char_ptr_element,
- "font_dir_alloc(chars)");
- if (mdata == 0 || chars == 0) {
- gs_free_object(struct_mem, chars, "font_dir_alloc(chars)");
- gs_free_object(struct_mem, mdata, "font_dir_alloc(mdata)");
- return_error(gs_error_VMerror);
- }
- pdir->fmcache.mmax = mmax;
- pdir->fmcache.mdata = mdata;
- pdir->ccache.struct_memory = struct_mem;
- pdir->ccache.bits_memory = bits_mem;
- pdir->ccache.bmax = bmax;
- pdir->ccache.cmax = cmax;
- pdir->ccache.lower = upper / 10;
- pdir->ccache.upper = upper;
- pdir->ccache.table = chars;
- pdir->ccache.table_mask = chsize - 1;
- gx_char_cache_init(pdir);
- return 0;
- }
-
- /* Initialize the character cache. */
- void
- gx_char_cache_init(register gs_font_dir * dir)
- {
- int i;
- cached_fm_pair *pair;
- char_cache_chunk *cck = (char_cache_chunk *)
- gs_alloc_bytes_immovable(dir->ccache.bits_memory,
- sizeof(char_cache_chunk),
- "initial_chunk");
-
- dir->fmcache.msize = 0;
- dir->fmcache.mnext = 0;
- gx_bits_cache_chunk_init(cck, NULL, 0);
- gx_bits_cache_init((gx_bits_cache *) & dir->ccache, cck);
- dir->ccache.bspace = 0;
- memset((char *)dir->ccache.table, 0,
- (dir->ccache.table_mask + 1) * sizeof(cached_char *));
- for (i = 0, pair = dir->fmcache.mdata;
- i < dir->fmcache.mmax; i++, pair++
- ) {
- pair->index = i;
- fm_pair_init(pair);
- }
- }
-
- /* ====== Purging ====== */
-
- /* Purge from the character cache all entries selected by */
- /* a client-supplied procedure. */
- void
- gx_purge_selected_cached_chars(gs_font_dir * dir,
- bool(*proc) (P2(cached_char *, void *)), void *proc_data)
- {
- int chi;
- int cmax = dir->ccache.table_mask;
-
- for (chi = 0; chi <= cmax;) {
- cached_char *cc = dir->ccache.table[chi];
-
- if (cc != 0 && (*proc) (cc, proc_data)) {
- hash_remove_cached_char(dir, chi);
- gx_free_cached_char(dir, cc);
- } else
- chi++;
- }
- }
-
- /* ====== Font-level routines ====== */
-
- /* Add a font/matrix pair to the cache. */
- /* (This is only exported for gxccache.c.) */
- cached_fm_pair *
- gx_add_fm_pair(register gs_font_dir * dir, gs_font * font, const gs_uid * puid,
- const gs_state * pgs)
- {
- register cached_fm_pair *pair =
- dir->fmcache.mdata + dir->fmcache.mnext;
- cached_fm_pair *mend =
- dir->fmcache.mdata + dir->fmcache.mmax;
-
- if (dir->fmcache.msize == dir->fmcache.mmax) { /* cache is full *//* Prefer an entry with num_chars == 0, if any. */
- int count;
-
- for (count = dir->fmcache.mmax;
- --count >= 0 && pair->num_chars != 0;
- )
- if (++pair == mend)
- pair = dir->fmcache.mdata;
- gs_purge_fm_pair(dir, pair, 0);
- } else { /* Look for an empty entry. (We know there is one.) */
- while (!fm_pair_is_free(pair))
- if (++pair == mend)
- pair = dir->fmcache.mdata;
- }
- dir->fmcache.msize++;
- dir->fmcache.mnext = pair + 1 - dir->fmcache.mdata;
- if (dir->fmcache.mnext == dir->fmcache.mmax)
- dir->fmcache.mnext = 0;
- pair->font = font;
- pair->UID = *puid;
- pair->FontType = font->FontType;
- /* The OSF/1 compiler doesn't like casting a pointer to */
- /* a shorter int.... */
- pair->hash = (uint) (ulong) pair % 549; /* scramble bits */
- pair->mxx = pgs->char_tm.xx, pair->mxy = pgs->char_tm.xy;
- pair->myx = pgs->char_tm.yx, pair->myy = pgs->char_tm.yy;
- pair->num_chars = 0;
- pair->xfont_tried = false;
- pair->xfont = 0;
- if_debug8('k', "[k]adding pair 0x%lx: font=0x%lx [%g %g %g %g] UID %ld, 0x%lx\n",
- (ulong) pair, (ulong) font,
- pair->mxx, pair->mxy, pair->myx, pair->myy,
- (long)pair->UID.id, (ulong) pair->UID.xvalues);
- return pair;
- }
-
- /* Look up the xfont for a font/matrix pair. */
- /* (This is only exported for gxccache.c.) */
- void
- gx_lookup_xfont(const gs_state * pgs, cached_fm_pair * pair, int encoding_index)
- {
- gx_device *dev = gs_currentdevice(pgs);
- gx_device *fdev = (*dev_proc(dev, get_xfont_device)) (dev);
- gs_font *font = pair->font;
- const gx_xfont_procs *procs = (*dev_proc(fdev, get_xfont_procs)) (fdev);
- gx_xfont *xf = 0;
-
- /* We mustn't attempt to use xfonts for stroked characters, */
- /* because such characters go outside their bounding box. */
- if (procs != 0 && font->PaintType == 0) {
- gs_matrix mat;
-
- mat.xx = pair->mxx, mat.xy = pair->mxy;
- mat.yx = pair->myx, mat.yy = pair->myy;
- mat.tx = 0, mat.ty = 0;
- /* xfonts can outlive their invocations, */
- /* but restore purges them properly. */
- pair->memory = pgs->memory;
- if (font->key_name.size != 0)
- xf = lookup_xfont_by_name(fdev, procs,
- &font->key_name, encoding_index,
- pair, &mat);
- #define font_name_eq(pfn1,pfn2)\
- ((pfn1)->size == (pfn2)->size && (pfn1)->size != 0 &&\
- !memcmp((char *)(pfn1)->chars, (char *)(pfn2)->chars, (pfn1)->size))
- if (xf == 0 && font->font_name.size != 0 &&
- /* Avoid redundant lookup */
- !font_name_eq(&font->font_name, &font->key_name)
- )
- xf = lookup_xfont_by_name(fdev, procs,
- &font->font_name, encoding_index,
- pair, &mat);
- if (xf == 0 && font->FontType != ft_composite &&
- uid_is_valid(&((gs_font_base *) font)->UID)
- ) { /* Look for an original font with the same UID. */
- gs_font_dir *pdir = font->dir;
- gs_font *pfont;
-
- for (pfont = pdir->orig_fonts; pfont != 0;
- pfont = pfont->next
- ) {
- if (pfont->FontType != ft_composite &&
- uid_equal(&((gs_font_base *) pfont)->UID,
- &((gs_font_base *) font)->UID) &&
- pfont->key_name.size != 0 &&
- !font_name_eq(&font->key_name,
- &pfont->key_name)
- ) {
- xf = lookup_xfont_by_name(fdev, procs,
- &pfont->key_name,
- encoding_index, pair, &mat);
- if (xf != 0)
- break;
- }
- }
- }
- }
- pair->xfont = xf;
- }
-
- /* ------ Internal routines ------ */
-
- /* Purge from the caches all references to a given font/matrix pair, */
- /* or just characters that depend on its xfont. */
- #define cpair ((cached_fm_pair *)vpair)
- private bool
- purge_fm_pair_char(cached_char * cc, void *vpair)
- {
- return cc_pair(cc) == cpair;
- }
- private bool
- purge_fm_pair_char_xfont(cached_char * cc, void *vpair)
- {
- return cc_pair(cc) == cpair && cpair->xfont == 0 && !cc_has_bits(cc);
- }
- #undef cpair
- void
- gs_purge_fm_pair(gs_font_dir * dir, cached_fm_pair * pair, int xfont_only)
- {
- if_debug2('k', "[k]purging pair 0x%lx%s\n",
- (ulong) pair, (xfont_only ? " (xfont only)" : ""));
- if (pair->xfont != 0) {
- (*pair->xfont->common.procs->release) (pair->xfont,
- pair->memory);
- pair->xfont_tried = false;
- pair->xfont = 0;
- }
- gx_purge_selected_cached_chars(dir,
- (xfont_only ? purge_fm_pair_char_xfont :
- purge_fm_pair_char),
- pair);
- if (!xfont_only) {
- #ifdef DEBUG
- if (pair->num_chars != 0) {
- lprintf1("Error in gs_purge_fm_pair: num_chars =%d\n",
- pair->num_chars);
- }
- #endif
- fm_pair_set_free(pair);
- dir->fmcache.msize--;
- }
- }
-
- /* Look up an xfont by name. */
- /* The caller must already have done get_xfont_device to get the proper */
- /* device to pass as the first argument to lookup_font. */
- private gx_xfont *
- lookup_xfont_by_name(gx_device * fdev, const gx_xfont_procs * procs,
- gs_font_name * pfstr, int encoding_index, const cached_fm_pair * pair,
- const gs_matrix * pmat)
- {
- gx_xfont *xf;
-
- if_debug5('k', "[k]lookup xfont %s [%g %g %g %g]\n",
- pfstr->chars, pmat->xx, pmat->xy, pmat->yx, pmat->yy);
- xf = (*procs->lookup_font) (fdev,
- &pfstr->chars[0], pfstr->size,
- encoding_index, &pair->UID,
- pmat, pair->memory);
- if_debug1('k', "[k]... xfont=0x%lx\n", (ulong) xf);
- return xf;
- }
-
- /* ====== Character-level routines ====== */
-
- /*
- * Allocate storage for caching a rendered character with possible
- * oversampling and/or alpha. Return the cached_char if OK, 0 if too big.
- * If the character is being oversampled, make the size decision
- * on the basis of the final (scaled-down) size.
- *
- * The iwidth and iheight parameters include scaling up for oversampling
- * (multiplication by 1 << pscale->{x,y}.)
- * The depth parameter is the final number of alpha bits;
- * depth <= x scale * y scale.
- * If dev == NULL, this is an xfont-only entry.
- * If dev != NULL, set up the memory device(s); in this case, if dev2 is
- * not NULL, dev should be an alpha-buffer device with dev2 (an alpha
- * device) as target.
- */
- cached_char *
- gx_alloc_char_bits(gs_font_dir * dir, gx_device_memory * dev,
- gx_device_memory * dev2, ushort iwidth, ushort iheight,
- const gs_log2_scale_point * pscale, int depth)
- {
- int log2_xscale = pscale->x;
- int log2_yscale = pscale->y;
- int log2_depth = ilog2(depth);
- uint nwidth_bits = (iwidth >> log2_xscale) << log2_depth;
- ulong isize, icdsize;
- uint iraster;
- cached_char *cc;
- gx_device_memory mdev;
- gx_device_memory *pdev = dev;
- gx_device_memory *pdev2;
-
- if (dev == NULL) {
- mdev.memory = 0;
- mdev.target = 0;
- pdev = &mdev;
- }
- pdev2 = (dev2 == 0 ? pdev : dev2);
-
- /* Compute the scaled-down bitmap size, and test against */
- /* the maximum cachable character size. */
-
- iraster = bitmap_raster(nwidth_bits);
- if (iraster != 0 && iheight >> log2_yscale > dir->ccache.upper / iraster) {
- if_debug5('k', "[k]no cache bits: scale=%dx%d, raster/scale=%u, height/scale=%u, upper=%u\n",
- 1 << log2_xscale, 1 << log2_yscale,
- iraster, iheight, dir->ccache.upper);
- return 0; /* too big */
- }
- /* Compute the actual bitmap size(s) and allocate the bits. */
- if (dev2 == 0) {
- /*
- * Render to a full (possibly oversampled) bitmap; compress
- * (if needed) when done.
- *
- * HACK: Preserve the reference count and retained flag.
- */
- rc_header rc;
- bool retained = pdev->retained;
- gx_device *target = pdev->target;
-
- rc = pdev->rc;
- /* Pass the correct target, but decrement its refct afterwards. */
- gs_make_mem_mono_device(pdev, pdev->memory, target);
- rc_decrement_only(target, "gx_alloc_char_bits"); /* can't go to 0 */
- pdev->rc = rc;
- pdev->retained = retained;
- pdev->width = iwidth;
- pdev->height = iheight;
- isize = gdev_mem_bitmap_size(pdev);
- } else {
- /* Use an alpha-buffer device to compress as we go. */
- /* Preserve the reference counts, if any. */
- rc_header rc;
-
- rc = dev2->rc;
- gs_make_mem_alpha_device(dev2, dev2->memory, NULL, depth);
- dev2->rc = rc;
- dev2->width = iwidth >> log2_xscale;
- dev2->height = iheight >> log2_yscale;
- rc = dev->rc;
- gs_make_mem_abuf_device(dev, dev->memory, (gx_device *) dev2,
- pscale, depth, 0);
- dev->rc = rc;
- dev->width = iwidth;
- dev->height = 2 << log2_yscale;
- isize = gdev_mem_bitmap_size(dev) +
- gdev_mem_bitmap_size(dev2);
- }
- icdsize = isize + sizeof_cached_char;
- cc = alloc_char(dir, icdsize);
- if (cc == 0)
- return 0;
- if_debug4('k', "[k]adding char 0x%lx:%u(%u,%u)\n",
- (ulong) cc, (uint) icdsize, iwidth, iheight);
-
- /* Fill in the entry. */
-
- cc_set_depth(cc, depth);
- cc->xglyph = gx_no_xglyph;
- /* Set the width and height to those of the device. */
- /* Note that if we are oversampling without an alpha buffer. */
- /* these are not the final unscaled dimensions. */
- cc->width = pdev2->width;
- cc->height = pdev2->height;
- cc->shift = 0;
- cc_set_raster(cc, gdev_mem_raster(pdev2));
- cc_set_pair_only(cc, 0); /* not linked in yet */
- cc->id = gx_no_bitmap_id;
-
- /* Open the cache device(s). */
-
- if (dev2) { /* The second device is an alpha device that targets */
- /* the real storage for the character. */
- byte *bits = cc_bits(cc);
- uint bsize = (uint) gdev_mem_bitmap_size(dev2);
-
- memset(bits, 0, bsize);
- dev2->base = bits;
- (*dev_proc(dev2, open_device)) ((gx_device *) dev2);
- dev->base = bits + bsize;
- (*dev_proc(dev, open_device)) ((gx_device *) dev);
- } else if (dev)
- gx_open_cache_device(dev, cc);
-
- return cc;
- }
-
- /* Open the cache device. */
- void
- gx_open_cache_device(gx_device_memory * dev, cached_char * cc)
- {
- byte *bits = cc_bits(cc);
-
- dev->width = cc->width;
- dev->height = cc->height;
- memset((char *)bits, 0, (uint) gdev_mem_bitmap_size(dev));
- dev->base = bits;
- (*dev_proc(dev, open_device)) ((gx_device *) dev); /* initialize */
- }
-
- /* Remove a character from the cache. */
- void
- gx_free_cached_char(gs_font_dir * dir, cached_char * cc)
- {
- char_cache_chunk *cck = cc->chunk;
-
- dir->ccache.chunks = cck;
- dir->ccache.cnext = (byte *) cc - cck->data;
- if (cc_pair(cc) != 0) { /* might be allocated but not added to table yet */
- cc_pair(cc)->num_chars--;
- }
- if_debug2('k', "[k]freeing char 0x%lx, pair=0x%lx\n",
- (ulong) cc, (ulong) cc_pair(cc));
- gx_bits_cache_free((gx_bits_cache *) & dir->ccache, &cc->head, cck);
- }
-
- /* Add a character to the cache */
- void
- gx_add_cached_char(gs_font_dir * dir, gx_device_memory * dev,
- cached_char * cc, cached_fm_pair * pair, const gs_log2_scale_point * pscale)
- {
- if_debug5('k', "[k]chaining char 0x%lx: pair=0x%lx, glyph=0x%lx, wmode=%d, depth=%d\n",
- (ulong) cc, (ulong) pair, (ulong) cc->code,
- cc->wmode, cc_depth(cc));
- if (dev != NULL) {
- static const gs_log2_scale_point no_scale =
- {0, 0};
-
- /* Close the device, to flush the alpha buffer if any. */
- (*dev_proc(dev, close_device)) ((gx_device *) dev);
- gx_add_char_bits(dir, cc,
- (gs_device_is_abuf((gx_device *) dev) ?
- &no_scale : pscale));
- }
- /* Add the new character to the hash table. */
- {
- uint chi = chars_head_index(cc->code, pair);
-
- while (dir->ccache.table[chi &= dir->ccache.table_mask] != 0)
- chi++;
- dir->ccache.table[chi] = cc;
- cc_set_pair(cc, pair);
- pair->num_chars++;
- }
- }
-
- /* Adjust the bits of a newly-rendered character, by unscaling */
- /* and compressing or converting to alpha values if necessary. */
- void
- gx_add_char_bits(gs_font_dir * dir, cached_char * cc,
- const gs_log2_scale_point * plog2_scale)
- {
- int log2_x = plog2_scale->x, log2_y = plog2_scale->y;
- uint raster = cc_raster(cc);
- byte *bits = cc_bits(cc);
- int depth = cc_depth(cc);
- int log2_depth = ilog2(depth);
- uint nwidth_bits, nraster;
- gs_int_rect bbox;
-
- #ifdef DEBUG
- if (cc->width % (1 << log2_x) != 0 ||
- cc->height % (1 << log2_y) != 0
- ) {
- lprintf4("size %d,%d not multiple of scale %d,%d!\n",
- cc->width, cc->height,
- 1 << log2_x, 1 << log2_y);
- cc->width &= -1 << log2_x;
- cc->height &= -1 << log2_y;
- }
- #endif
-
- /*
- * Compute the bounding box before compressing.
- * We may have to scan more bits, but this is a lot faster than
- * compressing the white space. Note that all bbox values are
- * in bits, not pixels.
- */
-
- bits_bounding_box(bits, cc->height, raster, &bbox);
-
- /*
- * If the character was oversampled, compress it now.
- * In this case we know that log2_depth <= log2_x.
- * If the character was not oversampled, or if we converted
- * oversampling to alpha dynamically (using an alpha buffer
- * intermediate device), log2_x and log2_y are both zero,
- * but in the latter case we may still have depth > 1.
- */
-
- if ((log2_x | log2_y) != 0) {
- if_debug5('k', "[k]compressing %dx%d by %dx%d to depth=%d\n",
- cc->width, cc->height, 1 << log2_x, 1 << log2_y,
- depth);
- if (gs_debug_c('K'))
- debug_dump_bitmap(bits, raster, cc->height,
- "[K]uncompressed bits");
- /* Truncate/round the bbox to a multiple of the scale. */
- {
- int scale_x = 1 << log2_x;
-
- bbox.p.x &= -scale_x;
- bbox.q.x = (bbox.q.x + scale_x - 1) & -scale_x;
- }
- {
- int scale_y = 1 << log2_y;
-
- bbox.p.y &= -scale_y;
- bbox.q.y = (bbox.q.y + scale_y - 1) & -scale_y;
- }
- cc->width = (bbox.q.x - bbox.p.x) >> log2_x;
- cc->height = (bbox.q.y - bbox.p.y) >> log2_y;
- nwidth_bits = cc->width << log2_depth;
- nraster = bitmap_raster(nwidth_bits);
- bits_compress_scaled(bits + raster * bbox.p.y, bbox.p.x,
- cc->width << log2_x,
- cc->height << log2_y,
- raster,
- bits, nraster, plog2_scale, log2_depth);
- bbox.p.x >>= log2_x;
- bbox.p.y >>= log2_y;
- } else {
- /* No oversampling, just remove white space on all 4 sides. */
- const byte *from = bits + raster * bbox.p.y + (bbox.p.x >> 3);
-
- cc->height = bbox.q.y - bbox.p.y;
- bbox.p.x &= ~7; /* adjust to byte boundary */
- bbox.p.x >>= log2_depth; /* bits => pixels */
- bbox.q.x = (bbox.q.x + depth - 1) >> log2_depth; /* ditto */
- cc->width = bbox.q.x - bbox.p.x;
- nwidth_bits = cc->width << log2_depth;
- nraster = bitmap_raster(nwidth_bits);
- if (bbox.p.x != 0 || nraster != raster) {
- /* Move the bits down and over. */
- byte *to = bits;
- uint n = cc->height;
-
- /* We'd like to move only
- uint nbytes = (nwidth_bits + 7) >> 3;
- * bytes per scan line, but unfortunately this drops
- * the guaranteed zero padding at the end.
- */
-
- for (; n--; from += raster, to += nraster)
- memmove(to, from, /*nbytes */ nraster);
- } else if (bbox.p.y != 0) { /* Just move the bits down. */
- memmove(bits, from, raster * cc->height);
- }
- }
-
- /* Adjust the offsets to account for removed white space. */
-
- cc->offset.x -= int2fixed(bbox.p.x);
- cc->offset.y -= int2fixed(bbox.p.y);
-
- /* Discard the memory device overhead that follows the bits, */
- /* and any space reclaimed from unscaling or compression. */
-
- cc_set_raster(cc, nraster);
- {
- uint diff = ROUND_DOWN(cc->head.size - sizeof_cached_char -
- nraster * cc->height,
- align_cached_char_mod);
-
- if (diff >= sizeof(cached_char_head)) {
- shorten_cached_char(dir, cc, diff);
- if_debug2('K', "[K]shortening char 0x%lx by %u (adding)\n",
- (ulong) cc, diff);
- }
- }
-
- /* Assign a bitmap id. */
-
- cc->id = gs_next_ids(1);
- }
-
- /* Purge from the caches all references to a given font. */
- void
- gs_purge_font_from_char_caches(gs_font_dir * dir, const gs_font * font)
- {
- cached_fm_pair *pair = dir->fmcache.mdata;
- int count = dir->fmcache.mmax;
-
- if_debug1('k', "[k]purging font 0x%lx\n",
- (ulong) font);
- while (count--) {
- if (pair->font == font) {
- if (uid_is_valid(&pair->UID)) { /* Keep the entry. */
- pair->font = 0;
- } else
- gs_purge_fm_pair(dir, pair, 0);
- }
- pair++;
- }
- }
-
- /* ------ Internal routines ------ */
-
- /* Allocate data space for a cached character, adding a new chunk if needed. */
- private cached_char *
- alloc_char(gs_font_dir * dir, ulong icdsize)
- { /* Try allocating at the current position first. */
- cached_char *cc = alloc_char_in_chunk(dir, icdsize);
-
- if (cc == 0) {
- if (dir->ccache.bspace < dir->ccache.bmax) { /* Allocate another chunk. */
- gs_memory_t *mem = dir->ccache.bits_memory;
- char_cache_chunk *cck_prev = dir->ccache.chunks;
- char_cache_chunk *cck;
- uint cksize = dir->ccache.bmax / 5 + 1;
- uint tsize = dir->ccache.bmax - dir->ccache.bspace;
- byte *cdata;
-
- if (cksize > tsize)
- cksize = tsize;
- if (icdsize + sizeof(cached_char_head) > cksize) {
- if_debug2('k', "[k]no cache bits: cdsize+head=%lu, cksize=%u\n",
- icdsize + sizeof(cached_char_head),
- cksize);
- return 0; /* wouldn't fit */
- }
- cck = (char_cache_chunk *)
- gs_alloc_bytes_immovable(mem, sizeof(*cck),
- "char cache chunk");
- if (cck == 0)
- return 0;
- cdata =
- gs_alloc_struct_array_immovable(mem, cksize, byte,
- &st_font_cache_bytes,
- "char cache chunk(data)");
- if (cdata == 0) {
- gs_free_object(mem, cck, "char cache chunk");
- return 0;
- }
- gx_bits_cache_chunk_init(cck, cdata, cksize);
- cck->next = cck_prev->next;
- cck_prev->next = cck;
- dir->ccache.bspace += cksize;
- dir->ccache.chunks = cck;
- } else { /* Cycle through existing chunks. */
- char_cache_chunk *cck_init = dir->ccache.chunks;
- char_cache_chunk *cck = cck_init;
-
- while ((dir->ccache.chunks = cck = cck->next) != cck_init) {
- dir->ccache.cnext = 0;
- cc = alloc_char_in_chunk(dir, icdsize);
- if (cc != 0)
- return cc;
- }
- }
- dir->ccache.cnext = 0;
- cc = alloc_char_in_chunk(dir, icdsize);
- }
- return cc;
- }
-
- /* Allocate a character in the current chunk. */
- private cached_char *
- alloc_char_in_chunk(gs_font_dir * dir, ulong icdsize)
- {
- char_cache_chunk *cck = dir->ccache.chunks;
- cached_char_head *cch;
-
- #define cc ((cached_char *)cch)
-
- while (gx_bits_cache_alloc((gx_bits_cache *) & dir->ccache,
- icdsize, &cch) < 0
- ) {
- if (cch == 0) { /* Not enough room to allocate in this chunk. */
- return 0;
- } { /* Free the character */
- cached_fm_pair *pair = cc_pair(cc);
-
- if (pair != 0) {
- uint chi = chars_head_index(cc->code, pair);
-
- while (dir->ccache.table[chi & dir->ccache.table_mask] != cc)
- chi++;
- hash_remove_cached_char(dir, chi);
- }
- gx_free_cached_char(dir, cc);
- }
- }
- cc->chunk = cck;
- cc->loc = (byte *) cc - cck->data;
- return cc;
- #undef cc
- }
-
- /* Remove the cached_char at a given index in the hash table. */
- /* In order not to slow down lookup, we relocate following entries. */
- private void
- hash_remove_cached_char(gs_font_dir * dir, uint chi)
- {
- uint mask = dir->ccache.table_mask;
- uint from = ((chi &= mask) + 1) & mask;
- cached_char *cc;
-
- dir->ccache.table[chi] = 0;
- while ((cc = dir->ccache.table[from]) != 0) { /* Loop invariants: chars[chi] == 0; */
- /* chars[chi+1..from] != 0. */
- uint fchi = chars_head_index(cc->code, cc_pair(cc));
-
- /* If chi <= fchi < from, we relocate the character. */
- /* Note that '<=' must take wraparound into account. */
- if ((chi < from ? chi <= fchi && fchi < from :
- chi <= fchi || fchi < from)
- ) {
- dir->ccache.table[chi] = cc;
- dir->ccache.table[from] = 0;
- chi = from;
- }
- from = (from + 1) & mask;
- }
- }
-
- /* Shorten a cached character. */
- /* diff >= sizeof(cached_char_head). */
- private void
- shorten_cached_char(gs_font_dir * dir, cached_char * cc, uint diff)
- {
- gx_bits_cache_shorten((gx_bits_cache *) & dir->ccache, &cc->head,
- diff, cc->chunk);
- if_debug2('K', "[K]shortening creates free block 0x%lx(%u)\n",
- (ulong) ((byte *) cc + cc->head.size), diff);
- }
-