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xserver/render/glyph.c

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/*
* $XFree86: xc/programs/Xserver/render/glyph.c,v 1.6 2001/10/28 03:34:19 tsi Exp $
*
* Copyright © 2000 SuSE, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of SuSE not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. SuSE makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Keith Packard, SuSE, Inc.
*/
#include "misc.h"
#include "scrnintstr.h"
#include "os.h"
#include "regionstr.h"
#include "validate.h"
#include "windowstr.h"
#include "input.h"
#include "resource.h"
#include "colormapst.h"
#include "cursorstr.h"
#include "dixstruct.h"
#include "gcstruct.h"
#include "servermd.h"
#include "picturestr.h"
#include "glyphstr.h"
/*
* From Knuth -- a good choice for hash/rehash values is p, p-2 where
* p and p-2 are both prime. These tables are sized to have an extra 10%
* free to avoid exponential performance degradation as the hash table fills
*/
static GlyphHashSetRec glyphHashSets[] = {
{ 32, 43, 41 },
{ 64, 73, 71 },
{ 128, 151, 149 },
{ 256, 283, 281 },
{ 512, 571, 569 },
{ 1024, 1153, 1151 },
{ 2048, 2269, 2267 },
{ 4096, 4519, 4517 },
{ 8192, 9013, 9011 },
{ 16384, 18043, 18041 },
{ 32768, 36109, 36107 },
{ 65536, 72091, 72089 },
{ 131072, 144409, 144407 },
{ 262144, 288361, 288359 },
{ 524288, 576883, 576881 },
{ 1048576, 1153459, 1153457 },
{ 2097152, 2307163, 2307161 },
{ 4194304, 4613893, 4613891 },
{ 8388608, 9227641, 9227639 },
{ 16777216, 18455029, 18455027 },
{ 33554432, 36911011, 36911009 },
{ 67108864, 73819861, 73819859 },
{ 134217728, 147639589, 147639587 },
{ 268435456, 295279081, 295279079 },
{ 536870912, 590559793, 590559791 }
};
#define NGLYPHHASHSETS (sizeof(glyphHashSets)/sizeof(glyphHashSets[0]))
const CARD8 glyphDepths[GlyphFormatNum] = { 1, 4, 8, 16, 32 };
GlyphHashRec globalGlyphs[GlyphFormatNum];
GlyphHashSetPtr
FindGlyphHashSet (CARD32 filled)
{
int i;
for (i = 0; i < NGLYPHHASHSETS; i++)
if (glyphHashSets[i].entries >= filled)
return &glyphHashSets[i];
return 0;
}
Bool
GlyphInit (ScreenPtr pScreen)
{
return TRUE;
}
GlyphRefPtr
FindGlyphRef (GlyphHashPtr hash, CARD32 signature, Bool match, GlyphPtr compare)
{
CARD32 elt, step, s;
GlyphPtr glyph;
GlyphRefPtr table, gr, del;
CARD32 tableSize = hash->hashSet->size;
table = hash->table;
elt = signature % tableSize;
step = 0;
del = 0;
for (;;)
{
gr = &table[elt];
s = gr->signature;
glyph = gr->glyph;
if (!glyph)
{
if (del)
gr = del;
break;
}
if (glyph == DeletedGlyph)
{
if (!del)
del = gr;
else if (gr == del)
break;
}
else if (s == signature &&
(!match ||
memcmp (&compare->info, &glyph->info, compare->size) == 0))
{
break;
}
if (!step)
{
step = signature % hash->hashSet->rehash;
if (!step)
step = 1;
}
elt += step;
if (elt >= tableSize)
elt -= tableSize;
}
return gr;
}
CARD32
HashGlyph (GlyphPtr glyph)
{
CARD32 *bits = (CARD32 *) &(glyph->info);
CARD32 hash;
int n = glyph->size / sizeof (CARD32);
hash = 0;
while (n--)
hash ^= *bits++;
return hash;
}
#ifdef CHECK_DUPLICATES
void
DuplicateRef (GlyphPtr glyph, char *where)
{
ErrorF ("Duplicate Glyph 0x%x from %s\n", glyph, where);
}
void
CheckDuplicates (GlyphHashPtr hash, char *where)
{
GlyphPtr g;
int i, j;
for (i = 0; i < hash->hashSet->size; i++)
{
g = hash->table[i].glyph;
if (!g || g == DeletedGlyph)
continue;
for (j = i + 1; j < hash->hashSet->size; j++)
if (hash->table[j].glyph == g)
DuplicateRef (g, where);
}
}
#else
#define CheckDuplicates(a,b)
#define DuplicateRef(a,b)
#endif
void
FreeGlyph (GlyphPtr glyph, int format)
{
CheckDuplicates (&globalGlyphs[format], "FreeGlyph");
if (--glyph->refcnt == 0)
{
GlyphRefPtr gr;
int i;
int first;
first = -1;
for (i = 0; i < globalGlyphs[format].hashSet->size; i++)
if (globalGlyphs[format].table[i].glyph == glyph)
{
if (first != -1)
DuplicateRef (glyph, "FreeGlyph check");
first = i;
}
gr = FindGlyphRef (&globalGlyphs[format],
HashGlyph (glyph), TRUE, glyph);
if (gr - globalGlyphs[format].table != first)
DuplicateRef (glyph, "Found wrong one");
if (gr->glyph && gr->glyph != DeletedGlyph)
{
gr->glyph = DeletedGlyph;
gr->signature = 0;
globalGlyphs[format].tableEntries--;
}
xfree (glyph);
}
}
void
AddGlyph (GlyphSetPtr glyphSet, GlyphPtr glyph, Glyph id)
{
GlyphRefPtr gr;
CARD32 hash;
CheckDuplicates (&globalGlyphs[glyphSet->fdepth], "AddGlyph top global");
/* Locate existing matching glyph */
hash = HashGlyph (glyph);
gr = FindGlyphRef (&globalGlyphs[glyphSet->fdepth], hash, TRUE, glyph);
if (gr->glyph && gr->glyph != DeletedGlyph)
{
xfree (glyph);
glyph = gr->glyph;
}
else
{
gr->glyph = glyph;
gr->signature = hash;
globalGlyphs[glyphSet->fdepth].tableEntries++;
}
/* Insert/replace glyphset value */
gr = FindGlyphRef (&glyphSet->hash, id, FALSE, 0);
++glyph->refcnt;
if (gr->glyph && gr->glyph != DeletedGlyph)
FreeGlyph (gr->glyph, glyphSet->fdepth);
else
glyphSet->hash.tableEntries++;
gr->glyph = glyph;
gr->signature = id;
CheckDuplicates (&globalGlyphs[glyphSet->fdepth], "AddGlyph bottom");
}
Bool
DeleteGlyph (GlyphSetPtr glyphSet, Glyph id)
{
GlyphRefPtr gr;
GlyphPtr glyph;
gr = FindGlyphRef (&glyphSet->hash, id, FALSE, 0);
glyph = gr->glyph;
if (glyph && glyph != DeletedGlyph)
{
gr->glyph = DeletedGlyph;
glyphSet->hash.tableEntries--;
FreeGlyph (glyph, glyphSet->fdepth);
return TRUE;
}
return FALSE;
}
GlyphPtr
FindGlyph (GlyphSetPtr glyphSet, Glyph id)
{
GlyphPtr glyph;
glyph = FindGlyphRef (&glyphSet->hash, id, FALSE, 0)->glyph;
if (glyph == DeletedGlyph)
glyph = 0;
return glyph;
}
GlyphPtr
AllocateGlyph (xGlyphInfo *gi, int fdepth)
{
int size;
GlyphPtr glyph;
size = gi->height * PixmapBytePad (gi->width, glyphDepths[fdepth]);
glyph = (GlyphPtr) xalloc (size + sizeof (GlyphRec));
if (!glyph)
return 0;
glyph->refcnt = 0;
glyph->size = size + sizeof (xGlyphInfo);
glyph->info = *gi;
return glyph;
}
Bool
AllocateGlyphHash (GlyphHashPtr hash, GlyphHashSetPtr hashSet)
{
hash->table = (GlyphRefPtr) xalloc (hashSet->size * sizeof (GlyphRefRec));
if (!hash->table)
return FALSE;
memset (hash->table, 0, hashSet->size * sizeof (GlyphRefRec));
hash->hashSet = hashSet;
hash->tableEntries = 0;
return TRUE;
}
Bool
ResizeGlyphHash (GlyphHashPtr hash, CARD32 change, Bool global)
{
CARD32 tableEntries;
GlyphHashSetPtr hashSet;
GlyphHashRec newHash;
GlyphRefPtr gr;
GlyphPtr glyph;
int i;
int oldSize;
CARD32 s;
tableEntries = hash->tableEntries + change;
hashSet = FindGlyphHashSet (tableEntries);
if (hashSet == hash->hashSet)
return TRUE;
if (global)
CheckDuplicates (hash, "ResizeGlyphHash top");
if (!AllocateGlyphHash (&newHash, hashSet))
return FALSE;
if (hash->table)
{
oldSize = hash->hashSet->size;
for (i = 0; i < oldSize; i++)
{
glyph = hash->table[i].glyph;
if (glyph && glyph != DeletedGlyph)
{
s = hash->table[i].signature;
gr = FindGlyphRef (&newHash, s, global, glyph);
gr->signature = s;
gr->glyph = glyph;
++newHash.tableEntries;
}
}
xfree (hash->table);
}
*hash = newHash;
if (global)
CheckDuplicates (hash, "ResizeGlyphHash bottom");
return TRUE;
}
Bool
ResizeGlyphSet (GlyphSetPtr glyphSet, CARD32 change)
{
return (ResizeGlyphHash (&glyphSet->hash, change, FALSE) &&
ResizeGlyphHash (&globalGlyphs[glyphSet->fdepth], change, TRUE));
}
GlyphSetPtr
AllocateGlyphSet (int fdepth, PictFormatPtr format)
{
GlyphSetPtr glyphSet;
if (!globalGlyphs[fdepth].hashSet)
{
if (!AllocateGlyphHash (&globalGlyphs[fdepth], &glyphHashSets[0]))
return FALSE;
}
glyphSet = xalloc (sizeof (GlyphSetRec));
if (!glyphSet)
return FALSE;
if (!AllocateGlyphHash (&glyphSet->hash, &glyphHashSets[0]))
{
xfree (glyphSet);
return FALSE;
}
glyphSet->refcnt = 1;
glyphSet->fdepth = fdepth;
glyphSet->format = format;
return glyphSet;
}
int
FreeGlyphSet (pointer value,
XID gid)
{
GlyphSetPtr glyphSet = (GlyphSetPtr) value;
if (--glyphSet->refcnt == 0)
{
CARD32 i, tableSize = glyphSet->hash.hashSet->size;
GlyphRefPtr table = glyphSet->hash.table;
GlyphPtr glyph;
for (i = 0; i < tableSize; i++)
{
glyph = table[i].glyph;
if (glyph && glyph != DeletedGlyph)
FreeGlyph (glyph, glyphSet->fdepth);
}
if (!globalGlyphs[glyphSet->fdepth].tableEntries)
{
xfree (globalGlyphs[glyphSet->fdepth].table);
globalGlyphs[glyphSet->fdepth].table = 0;
globalGlyphs[glyphSet->fdepth].hashSet = 0;
}
else
ResizeGlyphHash (&globalGlyphs[glyphSet->fdepth], 0, TRUE);
xfree (table);
xfree (glyphSet);
}
return Success;
}
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