pcfread.c

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/* $XConsortium: pcfread.c /main/18 1996/09/28 16:48:33 rws $ */

/*

Copyright (c) 1990  X Consortium

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from the X Consortium.

*/

/*
 * Author:  Keith Packard, MIT X Consortium
 */

#include "fntfilst.h"
#include "bitmap.h"
#include "pcf.h"
#ifndef MAX
#define   MAX(a,b)    (((a)>(b)) ? a : b)
#endif

/* Read PCF font files */

void        pcfUnloadFont();
static int  position;

static int
pcfGetLSB32(file)
    FontFilePtr file;
{
    int         c;

    c = FontFileGetc(file);
    c |= FontFileGetc(file) << 8;
    c |= FontFileGetc(file) << 16;
    c |= FontFileGetc(file) << 24;
    position += 4;
    return c;
}

static int
pcfGetINT32(file, format)
    FontFilePtr file;
    CARD32      format;
{
    int         c;

    if (PCF_BYTE_ORDER(format) == MSBFirst) {
	c = FontFileGetc(file) << 24;
	c |= FontFileGetc(file) << 16;
	c |= FontFileGetc(file) << 8;
	c |= FontFileGetc(file);
    } else {
	c = FontFileGetc(file);
	c |= FontFileGetc(file) << 8;
	c |= FontFileGetc(file) << 16;
	c |= FontFileGetc(file) << 24;
    }
    position += 4;
    return c;
}

static int
pcfGetINT16(file, format)
    FontFilePtr file;
    CARD32      format;
{
    int         c;

    if (PCF_BYTE_ORDER(format) == MSBFirst) {
	c = FontFileGetc(file) << 8;
	c |= FontFileGetc(file);
    } else {
	c = FontFileGetc(file);
	c |= FontFileGetc(file) << 8;
    }
    position += 2;
    return c;
}

#define pcfGetINT8(file, format) (position++, FontFileGetc(file))

static      PCFTablePtr
pcfReadTOC(file, countp)
    FontFilePtr file;
    int        *countp;
{
    CARD32      version;
    PCFTablePtr tables;
    int         count;
    int         i;

    position = 0;
    version = pcfGetLSB32(file);
    if (version != PCF_FILE_VERSION)
	return (PCFTablePtr) NULL;
    count = pcfGetLSB32(file);
    tables = (PCFTablePtr) xalloc(count * sizeof(PCFTableRec));
    if (!tables)
	return (PCFTablePtr) NULL;
    for (i = 0; i < count; i++) {
	tables[i].type = pcfGetLSB32(file);
	tables[i].format = pcfGetLSB32(file);
	tables[i].size = pcfGetLSB32(file);
	tables[i].offset = pcfGetLSB32(file);
    }
    *countp = count;
    return tables;
}

/*
 * PCF supports two formats for metrics, both the regular
 * jumbo size, and 'lite' metrics, which are useful
 * for most fonts which have even vaguely reasonable
 * metrics
 */

static
pcfGetMetric(file, format, metric)
    FontFilePtr file;
    CARD32      format;
    xCharInfo  *metric;
{
    metric->leftSideBearing = pcfGetINT16(file, format);
    metric->rightSideBearing = pcfGetINT16(file, format);
    metric->characterWidth = pcfGetINT16(file, format);
    metric->ascent = pcfGetINT16(file, format);
    metric->descent = pcfGetINT16(file, format);
    metric->attributes = pcfGetINT16(file, format);
}

static
pcfGetCompressedMetric(file, format, metric)
    FontFilePtr file;
    CARD32      format;
    xCharInfo  *metric;
{
    metric->leftSideBearing = pcfGetINT8(file, format) - 0x80;
    metric->rightSideBearing = pcfGetINT8(file, format) - 0x80;
    metric->characterWidth = pcfGetINT8(file, format) - 0x80;
    metric->ascent = pcfGetINT8(file, format) - 0x80;
    metric->descent = pcfGetINT8(file, format) - 0x80;
    metric->attributes = 0;
}

/*
 * Position the file to the begining of the specified table
 * in the font file
 */
static Bool
pcfSeekToType(file, tables, ntables, type, formatp, sizep)
    FontFilePtr file;
    PCFTablePtr tables;
    int         ntables;
    CARD32      type;
    CARD32     *formatp;
    CARD32     *sizep;
{
    int         i;

    for (i = 0; i < ntables; i++)
	if (tables[i].type == type) {
	    if (position > tables[i].offset)
		return FALSE;
	    if (!FontFileSkip(file, tables[i].offset - position))
		return FALSE;
	    position = tables[i].offset;
	    *sizep = tables[i].size;
	    *formatp = tables[i].format;
	    return TRUE;
	}
    return FALSE;
}

static Bool
pcfHasType (tables, ntables, type)
    PCFTablePtr tables;
    int         ntables;
    CARD32      type;
{
    int         i;

    for (i = 0; i < ntables; i++)
	if (tables[i].type == type)
	    return TRUE;
    return FALSE;
}

/*
 * pcfGetProperties 
 *
 * Reads the font properties from the font file, filling in the FontInfo rec
 * supplied.  Used by by both ReadFont and ReadFontInfo routines.
 */

static Bool
pcfGetProperties(pFontInfo, file, tables, ntables)
    FontInfoPtr pFontInfo;
    FontFilePtr file;
    PCFTablePtr tables;
    int         ntables;
{
    FontPropPtr props = 0;
    int         nprops;
    char       *isStringProp = 0;
    CARD32      format;
    int         i;
    int         size;
    int         string_size;
    char       *strings;

    /* font properties */

    if (!pcfSeekToType(file, tables, ntables, PCF_PROPERTIES, &format, &size))
	goto Bail;
    format = pcfGetLSB32(file);
    if (!PCF_FORMAT_MATCH(format, PCF_DEFAULT_FORMAT))
	goto Bail;
    nprops = pcfGetINT32(file, format);
    props = (FontPropPtr) xalloc(nprops * sizeof(FontPropRec));
    if (!props)
	goto Bail;
    isStringProp = (char *) xalloc(nprops * sizeof(char));
    if (!isStringProp)
	goto Bail;
    for (i = 0; i < nprops; i++) {
	props[i].name = pcfGetINT32(file, format);
	isStringProp[i] = pcfGetINT8(file, format);
	props[i].value = pcfGetINT32(file, format);
    }
    /* pad the property array */
    /*
     * clever here - nprops is the same as the number of odd-units read, as
     * only isStringProp are odd length
     */
    if (nprops & 3)
    {
	i = 4 - (nprops & 3);
	FontFileSkip(file, i);
	position += i;
    }
    string_size = pcfGetINT32(file, format);
    strings = (char *) xalloc(string_size);
    if (!strings) {
	goto Bail;
    }
    FontFileRead(file, strings, string_size);
    position += string_size;
    for (i = 0; i < nprops; i++) {
	props[i].name = MakeAtom(strings + props[i].name,
				 strlen(strings + props[i].name), TRUE);
	if (isStringProp[i]) {
	    props[i].value = MakeAtom(strings + props[i].value,
				      strlen(strings + props[i].value), TRUE);
	}
    }
    xfree(strings);
    pFontInfo->isStringProp = isStringProp;
    pFontInfo->props = props;
    pFontInfo->nprops = nprops;
    return TRUE;
Bail:
    xfree(isStringProp);
    xfree(props);
    return FALSE;
}


/*
 * pcfReadAccel
 *
 * Fill in the accelerator information from the font file; used
 * to read both BDF_ACCELERATORS and old style ACCELERATORS
 */

static Bool
pcfGetAccel(pFontInfo, file, tables, ntables, type)
    FontInfoPtr pFontInfo;
    FontFilePtr file;
    PCFTablePtr	tables;
    int		ntables;
    CARD32	type;
{
    CARD32      format;
    int		size;

    if (!pcfSeekToType(file, tables, ntables, type, &format, &size))
	goto Bail;
    format = pcfGetLSB32(file);
    if (!PCF_FORMAT_MATCH(format, PCF_DEFAULT_FORMAT) &&
	!PCF_FORMAT_MATCH(format, PCF_ACCEL_W_INKBOUNDS)) 
    {
	goto Bail;
    }
    pFontInfo->noOverlap = pcfGetINT8(file, format);
    pFontInfo->constantMetrics = pcfGetINT8(file, format);
    pFontInfo->terminalFont = pcfGetINT8(file, format);
    pFontInfo->constantWidth = pcfGetINT8(file, format);
    pFontInfo->inkInside = pcfGetINT8(file, format);
    pFontInfo->inkMetrics = pcfGetINT8(file, format);
    pFontInfo->drawDirection = pcfGetINT8(file, format);
    pFontInfo->anamorphic = FALSE;
    pFontInfo->cachable = TRUE;
     /* natural alignment */ pcfGetINT8(file, format);
    pFontInfo->fontAscent = pcfGetINT32(file, format);
    pFontInfo->fontDescent = pcfGetINT32(file, format);
    pFontInfo->maxOverlap = pcfGetINT32(file, format);
    pcfGetMetric(file, format, &pFontInfo->minbounds);
    pcfGetMetric(file, format, &pFontInfo->maxbounds);
    if (PCF_FORMAT_MATCH(format, PCF_ACCEL_W_INKBOUNDS)) {
	pcfGetMetric(file, format, &pFontInfo->ink_minbounds);
	pcfGetMetric(file, format, &pFontInfo->ink_maxbounds);
    } else {
	pFontInfo->ink_minbounds = pFontInfo->minbounds;
	pFontInfo->ink_maxbounds = pFontInfo->maxbounds;
    }
    return TRUE;
Bail:
    return FALSE;
}

int
pcfReadFont(pFont, file, bit, byte, glyph, scan)
    FontPtr     pFont;
    FontFilePtr file;
    int         bit,
                byte,
                glyph,
                scan;
{
    CARD32      format;
    CARD32      size;
    BitmapFontPtr  bitmapFont = 0;
    int         i;
    PCFTablePtr tables = 0;
    int         ntables;
    int         nmetrics;
    int         nbitmaps;
    int         sizebitmaps;
    int         nink_metrics;
    CharInfoPtr metrics = 0;
    xCharInfo  *ink_metrics = 0;
    char       *bitmaps = 0;
    CharInfoPtr *encoding = 0;
    int         nencoding;
    int         encodingOffset;
    CARD32      bitmapSizes[GLYPHPADOPTIONS];
    CARD32     *offsets = 0;
    Bool	hasBDFAccelerators;

    pFont->info.props = 0;
    if (!(tables = pcfReadTOC(file, &ntables)))
	goto Bail;

    /* properties */

    if (!pcfGetProperties(&pFont->info, file, tables, ntables))
	goto Bail;

    /* Use the old accelerators if no BDF accelerators are in the file */

    hasBDFAccelerators = pcfHasType (tables, ntables, PCF_BDF_ACCELERATORS);
    if (!hasBDFAccelerators)
	if (!pcfGetAccel (&pFont->info, file, tables, ntables, PCF_ACCELERATORS))
	    goto Bail;

    /* metrics */

    if (!pcfSeekToType(file, tables, ntables, PCF_METRICS, &format, &size)) {
	goto Bail;
    }
    format = pcfGetLSB32(file);
    if (!PCF_FORMAT_MATCH(format, PCF_DEFAULT_FORMAT) &&
	    !PCF_FORMAT_MATCH(format, PCF_COMPRESSED_METRICS)) {
	goto Bail;
    }
    if (PCF_FORMAT_MATCH(format, PCF_DEFAULT_FORMAT))
	nmetrics = pcfGetINT32(file, format);
    else
	nmetrics = pcfGetINT16(file, format);
    metrics = (CharInfoPtr) xalloc(nmetrics * sizeof(CharInfoRec));
    if (!metrics) {
	goto Bail;
    }
    for (i = 0; i < nmetrics; i++)
	if (PCF_FORMAT_MATCH(format, PCF_DEFAULT_FORMAT))
	    pcfGetMetric(file, format, &(metrics + i)->metrics);
	else
	    pcfGetCompressedMetric(file, format, &(metrics + i)->metrics);

    /* bitmaps */

    if (!pcfSeekToType(file, tables, ntables, PCF_BITMAPS, &format, &size))
	goto Bail;
    format = pcfGetLSB32(file);
    if (!PCF_FORMAT_MATCH(format, PCF_DEFAULT_FORMAT))
	goto Bail;

    nbitmaps = pcfGetINT32(file, format);
    if (nbitmaps != nmetrics)
	goto Bail;

    offsets = (CARD32 *) xalloc(nbitmaps * sizeof(CARD32));
    if (!offsets)
	goto Bail;

    for (i = 0; i < nbitmaps; i++)
	offsets[i] = pcfGetINT32(file, format);

    for (i = 0; i < GLYPHPADOPTIONS; i++)
	bitmapSizes[i] = pcfGetINT32(file, format);
    sizebitmaps = bitmapSizes[PCF_GLYPH_PAD_INDEX(format)];
    /* guard against completely empty font */
    bitmaps = (char *) xalloc(sizebitmaps ? sizebitmaps : 1);
    if (!bitmaps)
	goto Bail;
    FontFileRead(file, bitmaps, sizebitmaps);
    position += sizebitmaps;

    if (PCF_BIT_ORDER(format) != bit)
	BitOrderInvert(bitmaps, sizebitmaps);
    if ((PCF_BYTE_ORDER(format) == PCF_BIT_ORDER(format)) != (bit == byte)) {