src/fc/fsconvert.c

/*
 * Copyright 1990 Network Computing Devices
 *
 * 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 Network Computing Devices not be used
 * in advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.  Network Computing Devices
 * makes no representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 * NETWORK COMPUTING DEVICES DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
 * IN NO EVENT SHALL NETWORK COMPUTING DEVICES 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:  	Dave Lemke, Network Computing Devices, Inc
 */
/*
 * FS data conversion
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "libxfontint.h"
#include        <X11/X.h>
#include 	<X11/Xtrans/Xtrans.h>
#include	<X11/Xpoll.h>
#include	<X11/fonts/FS.h>
#include	<X11/fonts/FSproto.h>
#include	<X11/fonts/fontmisc.h>
#include	<X11/fonts/fontstruct.h>
#include	"fservestr.h"
#include	<X11/fonts/fontutil.h>
#include	"fslibos.h"

extern char _fs_glyph_undefined;
extern char _fs_glyph_requested;

/*
 * converts data from font server form to X server form
 */

void
_fs_convert_char_info(fsXCharInfo *src, xCharInfo *dst)
{
    dst->ascent = src->ascent;
    dst->descent = src->descent;
    dst->leftSideBearing = src->left;
    dst->rightSideBearing = src->right;
    dst->characterWidth = src->width;
    dst->attributes = src->attributes;
}

void
_fs_init_fontinfo(FSFpePtr conn, FontInfoPtr pfi)
{
    if (conn->fsMajorVersion == 1) {
	unsigned short n;
	n = pfi->firstCol;
	pfi->firstCol = pfi->firstRow;
	pfi->firstRow = n;
	n = pfi->lastCol;
	pfi->lastCol = pfi->lastRow;
	pfi->lastRow = n;
	pfi->defaultCh = ((pfi->defaultCh >> 8) & 0xff)
	                   + ((pfi->defaultCh & 0xff) << 8);
    }

    if (FontCouldBeTerminal (pfi))
    {
	pfi->terminalFont = TRUE;
	pfi->minbounds.ascent = pfi->fontAscent;
	pfi->minbounds.descent = pfi->fontDescent;
	pfi->minbounds.leftSideBearing = 0;
	pfi->minbounds.rightSideBearing = pfi->minbounds.characterWidth;
	pfi->maxbounds = pfi->minbounds;
    }

    FontComputeInfoAccelerators (pfi);
}

int
_fs_convert_props(fsPropInfo *pi, fsPropOffset *po, pointer pd,
		  FontInfoPtr pfi)
{
    FontPropPtr dprop;
    int         i,
                nprops;
    char       *is_str;
    fsPropOffset local_off;
    char *off_adr;
    char *pdc = pd;

/* stolen from server/include/resource.h */
#define BAD_RESOURCE 0xe0000000

    nprops = pfi->nprops = pi->num_offsets;

    if (nprops < 0
	|| nprops > SIZE_MAX/(sizeof(FontPropRec) + sizeof(char)))
	return -1;

    dprop = malloc(sizeof(FontPropRec) * nprops + sizeof (char) * nprops);
    if (!dprop)
	return -1;

    is_str = (char *) (dprop + nprops);
    pfi->props = dprop;
    pfi->isStringProp = is_str;

    off_adr = (char *)po;
    for (i = 0; i < nprops; i++, dprop++, is_str++)
    {
	memcpy(&local_off, off_adr, SIZEOF(fsPropOffset));
	if ((local_off.name.position >= pi->data_len) ||
		(local_off.name.length >
		 (pi->data_len - local_off.name.position)))
	    goto bail;
	dprop->name = MakeAtom(&pdc[local_off.name.position],
			       local_off.name.length, 1);
	if (local_off.type != PropTypeString) {
	    *is_str = FALSE;
	    dprop->value = local_off.value.position;
	} else {
	    *is_str = TRUE;
	    if ((local_off.value.position >= pi->data_len) ||
		(local_off.value.length >
		 (pi->data_len - local_off.value.position)))
		goto bail;
	    dprop->value = (INT32) MakeAtom(&pdc[local_off.value.position],
					    local_off.value.length, 1);
	    if (dprop->value == BAD_RESOURCE)
	    {
	      bail:
		free (pfi->props);
		pfi->nprops = 0;
		pfi->props = 0;
		pfi->isStringProp = 0;
		return -1;
	    }
	}
	off_adr += SIZEOF(fsPropOffset);
    }

    return nprops;
}

void
_fs_free_props (FontInfoPtr pfi)
{
    if (pfi->props)
    {
	free (pfi->props);
	pfi->nprops = 0;
	pfi->props = 0;
    }
}

int
_fs_convert_lfwi_reply(FSFpePtr conn, FontInfoPtr pfi,
		       fsListFontsWithXInfoReply *fsrep,
		       fsPropInfo *pi, fsPropOffset *po, pointer pd)
{
    fsUnpack_XFontInfoHeader(fsrep, pfi);
    _fs_init_fontinfo(conn, pfi);

    if (_fs_convert_props(pi, po, pd, pfi) == -1)
	return AllocError;

    return Successful;
}


#define ENCODING_UNDEFINED(enc) \
	((enc)->bits == &_fs_glyph_undefined ? \
	 TRUE : \
	 (access_done = access_done && (enc)->bits != &_fs_glyph_requested, \
	  FALSE))

#define GLYPH_UNDEFINED(loc) ENCODING_UNDEFINED(encoding + (loc))

/*
 * figures out what glyphs to request
 *
 * Includes logic to attempt to reduce number of round trips to the font
 * server:  when a glyph is requested, fs_build_range() requests a
 * 16-glyph range of glyphs that contains the requested glyph.  This is
 * predicated on the belief that using a glyph increases the chances
 * that nearby glyphs will be used: a good assumption for phonetic
 * alphabets, but a questionable one for ideographic/pictographic ones.
 */
/* ARGSUSED */
int
fs_build_range(FontPtr pfont, Bool range_flag, unsigned int count,
	       int item_size, unsigned char *data, int *nranges,
	       fsRange **ranges)
{
    FSFontDataPtr fsd = (FSFontDataPtr) (pfont->fpePrivate);
    FSFontPtr fsfont = (FSFontPtr) (pfont->fontPrivate);
    register CharInfoPtr encoding = fsfont->encoding;
    FontInfoPtr pfi = &(pfont->info);
    fsRange	range;
    int		access_done = TRUE;
    int		err;
    register unsigned long firstrow, lastrow, firstcol, lastcol;
    register unsigned long row;
    register unsigned long col;
    register unsigned long loc;

    if (!fsd->glyphs_to_get)
	return AccessDone;

    firstrow = pfi->firstRow;
    lastrow = pfi->lastRow;
    firstcol = pfi->firstCol;
    lastcol = pfi->lastCol;

    /* Make sure we have default char */
    if (fsfont->pDefault && ENCODING_UNDEFINED(fsfont->pDefault))
    {
	loc = fsfont->pDefault - encoding;
	row = loc / (lastcol - firstcol + 1) + firstrow;
	col = loc % (lastcol - firstcol + 1) + firstcol;

	range.min_char_low = range.max_char_low = col;
	range.min_char_high = range.max_char_high = row;

	if ((err = add_range(&range, nranges, ranges, FALSE)) !=
	    Successful) return err;
	encoding[loc].bits = &_fs_glyph_requested;
	access_done = FALSE;
    }

    if (!range_flag && item_size == 1)
    {
	if (firstrow != 0) return AccessDone;
	while (count--)
	{
	    col = *data++;
	    if (col >= firstcol && col <= lastcol &&
		GLYPH_UNDEFINED(col - firstcol))
	    {
		int col1, col2;
		col1 = col & 0xf0;
		col2 = col1 + 15;
		if (col1 < firstcol) col1 = firstcol;
		if (col2 > lastcol) col2 = lastcol;
		/* Collect a 16-glyph neighborhood containing the requested
		   glyph... should in most cases reduce the number of round
		   trips to the font server. */
		for (col = col1; col <= col2; col++)
		{
		    if (!GLYPH_UNDEFINED(col - firstcol)) continue;
		    range.min_char_low = range.max_char_low = col;
		    range.min_char_high = range.max_char_high = 0;
		    if ((err = add_range(&range, nranges, ranges, FALSE)) !=
		        Successful) return err;
		    encoding[col - firstcol].bits = &_fs_glyph_requested;
		    access_done = FALSE;
		}
	    }
	}
    }
    else
    {
	fsRange fullrange[1];

	if (range_flag && count == 0)
	{
	    count = 2;
	    data = (unsigned char *)fullrange;
	    fullrange[0].min_char_high = firstrow;
	    fullrange[0].min_char_low = firstcol;
	    fullrange[0].max_char_high = lastrow;
	    fullrange[0].max_char_low = lastcol;
	}

	while (count--)
	{
	    int row1, col1, row2, col2;
	    row1 = row2 = *data++;
	    col1 = col2 = *data++;
	    if (range_flag)
	    {
		if (count)
		{
		    row2 = *data++;
		    col2 = *data++;
		    count--;
		}
		else
		{
		    row2 = lastrow;
		    col2 = lastcol;
		}
		if (row1 < firstrow) row1 = firstrow;
		if (row2 > lastrow) row2 = lastrow;
		if (col1 < firstcol) col1 = firstcol;
		if (col2 > lastcol) col2 = lastcol;
	    }
	    else
	    {
		if (row1 < firstrow || row1 > lastrow ||
		    col1 < firstcol || col1 > lastcol)
		    continue;
	    }
	    for (row = row1; row <= row2; row++)
	    {
	    expand_glyph_range: ;
		loc = (row - firstrow) * (lastcol + 1 - firstcol) +
		      (col1 - firstcol);
		for (col = col1; col <= col2; col++, loc++)
		{
		    if (GLYPH_UNDEFINED(loc))
		    {
			if (row1 == row2 &&
			    (((col1 & 0xf) && col1 > firstcol) ||
			     (col2 & 0xf) != 0xf) && (col2 < lastcol))
			{
			    /* If we're loading from a single row, expand
			       range of glyphs loaded to a multiple of
			       a 16-glyph range -- attempt to reduce number
			       of round trips to the font server. */
			    col1 &= 0xf0;
			    col2 = (col2 & 0xf0) + 15;
			    if (col1 < firstcol) col1 = firstcol;
			    if (col2 > lastcol) col2 = lastcol;
			    goto expand_glyph_range;
			}
			range.min_char_low = range.max_char_low = col;
			range.min_char_high = range.max_char_high = row;
			if ((err = add_range(&range, nranges, ranges, FALSE)) !=
			    Successful) return err;
			encoding[loc].bits = &_fs_glyph_requested;
			access_done = FALSE;
		    }
		}
	    }
	}
    }

    return access_done ?
	   AccessDone :
	   Successful;
}

#undef GLYPH_UNDEFINED
#undef ENCODING_UNDEFINED


/* _fs_clean_aborted_loadglyphs(): Undoes the changes to the encoding array
   performed by fs_build_range(); for use if the associated LoadGlyphs
   requests needs to be cancelled. */

void
_fs_clean_aborted_loadglyphs(FontPtr pfont, int num_expected_ranges,
			     fsRange *expected_ranges)
{
    register FSFontPtr fsfont;
    register int i;

    fsfont = (FSFontPtr) pfont->fontPrivate;
    if (fsfont->encoding)
    {
	fsRange full_range[1];
	if (!num_expected_ranges)
	{
	    full_range[0].min_char_low = pfont->info.firstCol;
	    full_range[0].min_char_high = pfont->info.firstRow;
	    full_range[0].max_char_low = pfont->info.lastCol;
	    full_range[0].max_char_high = pfont->info.lastRow;
	    num_expected_ranges = 1;
	    expected_ranges = full_range;
	}

	for (i = 0; i < num_expected_ranges; i++)
	{
	    int row, col;
	    for (row = expected_ranges[i].min_char_high;
		 row <= expected_ranges[i].max_char_high;
		 row++)
	    {
		register CharInfoPtr encoding = fsfont->encoding +
		    ((row - pfont->info.firstRow) *
		     (pfont->info.lastCol -
		      pfont->info.firstCol + 1) +
		     expected_ranges[i].min_char_low -
		     pfont->info.firstCol);
		for (col = expected_ranges[i].min_char_low;
		     col <= expected_ranges[i].max_char_low;
		     encoding++, col++)
		{
		    if (encoding->bits == &_fs_glyph_requested)
			encoding->bits = &_fs_glyph_undefined;
		}
	    }
	}
    }
}

static int
_fs_get_glyphs(FontPtr pFont, unsigned long count, unsigned char *chars,
	       FontEncoding charEncoding,
	       unsigned long *glyphCount, /* RETURN */
	       CharInfoPtr *glyphs) 	  /* RETURN  */
{
    FSFontPtr   fsdata;
    unsigned int firstCol;
    register unsigned int numCols;
    unsigned int firstRow;
    unsigned int numRows;
    CharInfoPtr *glyphsBase;
    register unsigned int c;
    register CharInfoPtr pci;
    unsigned int r;
    CharInfoPtr encoding;
    CharInfoPtr pDefault;
    FSFontDataPtr fsd = (FSFontDataPtr) pFont->fpePrivate;
    int         err = Successful;

    fsdata = (FSFontPtr) pFont->fontPrivate;
    encoding = fsdata->encoding;
    pDefault = fsdata->pDefault;
    firstCol = pFont->info.firstCol;
    numCols = pFont->info.lastCol - firstCol + 1;
    glyphsBase = glyphs;

    /* In this age of glyph caching, any glyphs gotten through this
       procedure should already be loaded.  If they are not, we are
       dealing with someone (perhaps a ddx driver optimizing a font)
       that doesn't understand the finer points of glyph caching.  The
       CHECK_ENCODING macro checks for this condition...  if found, it
       calls fs_load_all_glyphs(), which corrects it.  Since the caller
       of this code will not know how to handle a return value of
       Suspended, the fs_load_all_glyphs() procedure will block and
       freeze the server until the load operation is done.  Moral: the
       glyphCachingMode flag really must indicate the capabilities of
       the ddx drivers.  */

#define CHECK_ENCODING(cnum) \
    ( pci = encoding + (cnum), \
      fsd->glyphs_to_get ? \
      ( pci->bits == &_fs_glyph_undefined || pci->bits == &_fs_glyph_requested ? \
	((err = fs_load_all_glyphs(pFont)), pci) : \
	pci ) : \
      pci )

    switch (charEncoding) {

    case Linear8Bit:
    case TwoD8Bit:
	if (pFont->info.firstRow > 0)
	    break;
	if (pFont->info.allExist && pDefault) {
	    while (err == Successful && count--) {
		c = (*chars++) - firstCol;
		if (c < numCols)
		    *glyphs++ = CHECK_ENCODING(c);
		else
		    *glyphs++ = pDefault;
	    }
	} else {
	    while (err == Successful && count--) {
		c = (*chars++) - firstCol;
		if (c < numCols && CHECK_ENCODING(c)->bits)
		    *glyphs++ = pci;
		else if (pDefault)
		    *glyphs++ = pDefault;
	    }
	}
	break;
    case Linear16Bit:
	if (pFont->info.allExist && pDefault) {
	    while (err == Successful && count--) {
		c = *chars++ << 8;
		c = (c | *chars++) - firstCol;
		if (c < numCols)
		    *glyphs++ = CHECK_ENCODING(c);
		else
		    *glyphs++ = pDefault;
	    }
	} else {
	    while (err == Successful && count--) {
		c = *chars++ << 8;
		c = (c | *chars++) - firstCol;
		if (c < numCols && CHECK_ENCODING(c)->bits)
		    *glyphs++ = pci;
		else if (pDefault)
		    *glyphs++ = pDefault;
	    }
	}
	break;

    case TwoD16Bit:
	firstRow = pFont->info.firstRow;
	numRows = pFont->info.lastRow - firstRow + 1;
	while (err == Successful && count--) {
	    r = (*chars++) - firstRow;
	    c = (*chars++) - firstCol;
	    if (r < numRows && c < numCols &&
		    CHECK_ENCODING(r * numCols + c)->bits)
		*glyphs++ = pci;
	    else if (pDefault)
		*glyphs++ = pDefault;
	}
	break;
    }
    *glyphCount = glyphs - glyphsBase;
    return err;
}


static int
_fs_get_metrics(FontPtr pFont, unsigned long count, unsigned char *chars,
		FontEncoding charEncoding,
		unsigned long *glyphCount, /* RETURN */
		xCharInfo **glyphs) 	   /* RETURN */
{
    FSFontPtr   fsdata;
    unsigned int firstCol;
    register unsigned int numCols;
    unsigned int firstRow;
    unsigned int numRows;
    xCharInfo **glyphsBase;
    register unsigned int c;
    unsigned int r;
    CharInfoPtr encoding;
    CharInfoPtr pDefault;

    fsdata = (FSFontPtr) pFont->fontPrivate;
    encoding = fsdata->inkMetrics;
    pDefault = fsdata->pDefault;
    /* convert default bitmap metric to default ink metric */
    if (pDefault)
	pDefault = encoding + (pDefault - fsdata->encoding);
    firstCol = pFont->info.firstCol;
    numCols = pFont->info.lastCol - firstCol + 1;
    glyphsBase = glyphs;


    /* XXX - this should be much smarter */
    /* make sure the glyphs are there */
    switch (charEncoding) {

    case Linear8Bit:
    case TwoD8Bit:
	if (pFont->info.firstRow > 0)
	    break;
	if (pFont->info.allExist && pDefault) {
	    while (count--) {
		c = (*chars++) - firstCol;
		if (c < numCols)
		    *glyphs++ = (xCharInfo *)&encoding[c];
		else
		    *glyphs++ = (xCharInfo *)pDefault;
	    }
	} else {
	    while (count--) {
		c = (*chars++) - firstCol;
		if (c < numCols)
		    *glyphs++ = (xCharInfo *)(encoding + c);
		else if (pDefault)
		    *glyphs++ = (xCharInfo *)pDefault;
	    }
	}
	break;
    case Linear16Bit:
	if (pFont->info.allExist && pDefault) {
	    while (count--) {
		c = *chars++ << 8;
		c = (c | *chars++) - firstCol;
		if (c < numCols)
		    *glyphs++ = (xCharInfo *)(encoding + c);
		else
		    *glyphs++ = (xCharInfo *)pDefault;
	    }
	} else {
	    while (count--) {
		c = *chars++ << 8;
		c = (c | *chars++) - firstCol;
		if (c < numCols)
		    *glyphs++ = (xCharInfo *)(encoding + c);
		else if (pDefault)
		    *glyphs++ = (xCharInfo *)pDefault;
	    }
	}
	break;

    case TwoD16Bit:
	firstRow = pFont->info.firstRow;
	numRows = pFont->info.lastRow - firstRow + 1;
	while (count--) {
	    r = (*chars++) - firstRow;
	    c = (*chars++) - firstCol;
	    if (r < numRows && c < numCols)
		*glyphs++ = (xCharInfo *)(encoding + (r * numCols + c));
	    else if (pDefault)
		*glyphs++ = (xCharInfo *)pDefault;
	}
	break;
    }
    *glyphCount = glyphs - glyphsBase;
    return Successful;
}


static void
_fs_unload_font(FontPtr pfont)
{
    FSFontPtr	    fsdata = (FSFontPtr) pfont->fontPrivate;
    FSFontDataPtr   fsd = (FSFontDataPtr) pfont->fpePrivate;
    CharInfoPtr	    encoding = fsdata->encoding;
    FSGlyphPtr	    glyphs;

    /*
     * fsdata points at FSFontRec, FSFontDataRec and name
     */
    if (encoding)
	free(encoding);

    while ((glyphs = fsdata->glyphs))
    {
	fsdata->glyphs = glyphs->next;
	free (glyphs);
    }

    /* XXX we may get called after the resource DB has been cleaned out */
    if (find_old_font(fsd->fontid))
	DeleteFontClientID (fsd->fontid);

    _fs_free_props (&pfont->info);

    free(fsdata);

    DestroyFontRec(pfont);
}

FontPtr
fs_create_font (FontPathElementPtr  fpe,
		const char	    *name,
		int		    namelen,
		fsBitmapFormat	    format,
		fsBitmapFormatMask  fmask)
{
    FontPtr	    pfont;
    FSFontPtr	    fsfont;
    FSFontDataPtr   fsd;
    int		    bit, byte, scan, glyph;

    pfont = CreateFontRec ();
    if (!pfont)
	return 0;
    fsfont = malloc (sizeof (FSFontRec) + sizeof (FSFontDataRec) + namelen + 1);
    if (!fsfont)
    {
	DestroyFontRec (pfont);
	return 0;
    }
    fsd = (FSFontDataPtr) (fsfont + 1);
    bzero((char *) fsfont, sizeof(FSFontRec));
    bzero((char *) fsd, sizeof(FSFontDataRec));

    pfont->fpe = fpe;
    pfont->fontPrivate = (pointer) fsfont;
    pfont->fpePrivate = (pointer) fsd;

    /* These font components will be needed in packGlyphs */
    CheckFSFormat(format, BitmapFormatMaskBit |
		  BitmapFormatMaskByte |
		  BitmapFormatMaskScanLineUnit |
		  BitmapFormatMaskScanLinePad,
		  &bit,
		  &byte,
		  &scan,
		  &glyph,
		  NULL);
    pfont->format = format;
    pfont->bit = bit;
    pfont->byte = byte;
    pfont->scan = scan;
    pfont->glyph = glyph;

    pfont->info.nprops = 0;
    pfont->info.props = 0;
    pfont->info.isStringProp = 0;

    /* set font function pointers */
    pfont->get_glyphs = _fs_get_glyphs;
    pfont->get_metrics = _fs_get_metrics;
    pfont->unload_font = _fs_unload_font;
    pfont->unload_glyphs = NULL;

    /* set the FPE private information */
    fsd->format = format;
    fsd->fmask = fmask;
    fsd->name = (char *) (fsd + 1);
    memcpy (fsd->name, name, namelen);
    fsd->name[namelen] = '\0';
    fsd->fontid = GetNewFontClientID ();

    /* save the ID */
    if (!StoreFontClientFont(pfont, fsd->fontid))
    {
	free (fsfont);
	DestroyFontRec (pfont);
	return 0;
    }

    return pfont;
}

pointer
fs_alloc_glyphs (FontPtr pFont, int size)
{
    FSGlyphPtr	glyphs;
    FSFontPtr	fsfont = (FSFontPtr) pFont->fontPrivate;

    if (size < (INT_MAX - sizeof (FSGlyphRec)))
	glyphs = malloc (sizeof (FSGlyphRec) + size);
    else
	glyphs = NULL;
    if (glyphs == NULL)
	return NULL;
    glyphs->next = fsfont->glyphs;
    fsfont->glyphs = glyphs;
    return (pointer) (glyphs + 1);
}