pcfwrite.c

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/* $XConsortium: pcfwrite.c,v 1.6 94/04/17 20:17:16 gildea Exp $ */

/*

Copyright (c) 1990, 1994  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"

/* Write PCF font files */

static int  current_position;

static int
pcfWrite(file, b, c)
    FontFilePtr file;
    char       *b;
    int         c;
{
    current_position += c;
    return FontFileWrite(file, b, c);
}

static int
pcfPutLSB32(file, c)
    FontFilePtr file;
{
    current_position += 4;
    (void) FontFilePutc(c, file);
    (void) FontFilePutc(c >> 8, file);
    (void) FontFilePutc(c >> 16, file);
    return FontFilePutc(c >> 24, file);
}

static int
pcfPutINT32(file, format, c)
    FontFilePtr file;
    CARD32      format;
{
    current_position += 4;
    if (PCF_BYTE_ORDER(format) == MSBFirst) {
	(void) FontFilePutc(c >> 24, file);
	(void) FontFilePutc(c >> 16, file);
	(void) FontFilePutc(c >> 8, file);
	return FontFilePutc(c, file);
    } else {
	(void) FontFilePutc(c, file);
	(void) FontFilePutc(c >> 8, file);
	(void) FontFilePutc(c >> 16, file);
	return FontFilePutc(c >> 24, file);
    }
}

static int
pcfPutINT16(file, format, c)
    FontFilePtr file;
    CARD32      format;
{
    current_position += 2;
    if (PCF_BYTE_ORDER(format) == MSBFirst) {
	(void) FontFilePutc(c >> 8, file);
	return FontFilePutc(c, file);
    } else {
	(void) FontFilePutc(c, file);
	return FontFilePutc(c >> 8, file);
    }
}

/*ARGSUSED*/
static int
pcfPutINT8(file, format, c)
    FontFilePtr file;
    CARD32      format;
{
    current_position += 1;
    return FontFilePutc(c, file);
}

static
pcfWriteTOC(file, table, count)
    FontFilePtr file;
    PCFTablePtr table;
    int         count;
{
    CARD32      version;
    int         i;

    version = PCF_FILE_VERSION;
    pcfPutLSB32(file, version);
    pcfPutLSB32(file, count);
    for (i = 0; i < count; i++) {
	pcfPutLSB32(file, table->type);
	pcfPutLSB32(file, table->format);
	pcfPutLSB32(file, table->size);
	pcfPutLSB32(file, table->offset);
	table++;
    }
}

static
pcfPutCompressedMetric(file, format, metric)
    FontFilePtr file;
    CARD32      format;
    xCharInfo  *metric;
{
    pcfPutINT8(file, format, metric->leftSideBearing + 0x80);
    pcfPutINT8(file, format, metric->rightSideBearing + 0x80);
    pcfPutINT8(file, format, metric->characterWidth + 0x80);
    pcfPutINT8(file, format, metric->ascent + 0x80);
    pcfPutINT8(file, format, metric->descent + 0x80);
}

static
pcfPutMetric(file, format, metric)
    FontFilePtr file;
    CARD32      format;
    xCharInfo  *metric;
{
    pcfPutINT16(file, format, metric->leftSideBearing);
    pcfPutINT16(file, format, metric->rightSideBearing);
    pcfPutINT16(file, format, metric->characterWidth);
    pcfPutINT16(file, format, metric->ascent);
    pcfPutINT16(file, format, metric->descent);
    pcfPutINT16(file, format, metric->attributes);
}

static
pcfPutBitmap(file, format, pCI)
    FontFilePtr file;
    CARD32      format;
    CharInfoPtr pCI;
{
    int         count;
    unsigned char *bits;

    count = BYTES_FOR_GLYPH(pCI, PCF_GLYPH_PAD(format));
    bits = (unsigned char *) pCI->bits;
    current_position += count;
    while (count--)
	FontFilePutc(*bits++, file);
}

static
pcfPutAccel(file, format, pFontInfo)
    FontFilePtr file;
    CARD32      format;
    FontInfoPtr pFontInfo;
{
    pcfPutINT8(file, format, pFontInfo->noOverlap);
    pcfPutINT8(file, format, pFontInfo->constantMetrics);
    pcfPutINT8(file, format, pFontInfo->terminalFont);
    pcfPutINT8(file, format, pFontInfo->constantWidth);
    pcfPutINT8(file, format, pFontInfo->inkInside);
    pcfPutINT8(file, format, pFontInfo->inkMetrics);
    pcfPutINT8(file, format, pFontInfo->drawDirection);
    pcfPutINT8(file, format, 0);
    pcfPutINT32(file, format, pFontInfo->fontAscent);
    pcfPutINT32(file, format, pFontInfo->fontDescent);
    pcfPutINT32(file, format, pFontInfo->maxOverlap);
    pcfPutMetric(file, format, &pFontInfo->minbounds);
    pcfPutMetric(file, format, &pFontInfo->maxbounds);
    if (PCF_FORMAT_MATCH(format, PCF_ACCEL_W_INKBOUNDS)) {
	pcfPutMetric(file, format, &pFontInfo->ink_minbounds);
	pcfPutMetric(file, format, &pFontInfo->ink_maxbounds);
    }
}

#define S32 4
#define S16 2
#define S8 1

#define Pad(s)	    (RoundUp(s) - (s))
#define RoundUp(s)  (((s) + 3) & ~3)

#define Compressable(i)	(-128 <= (i) && (i) <= 127)

#define CanCompressMetric(m)	(Compressable((m)->leftSideBearing) && \
				 Compressable((m)->rightSideBearing) && \
				 Compressable((m)->characterWidth) && \
				 Compressable((m)->ascent) && \
				 Compressable((m)->descent) && \
				 (m)->attributes == 0)

#define CanCompressMetrics(min,max) (CanCompressMetric(min) && CanCompressMetric(max))

static char *
pcfNameForAtom(a)
    Atom        a;
{
    return NameForAtom(a);
}

pcfWriteFont(pFont, file)
    FontPtr     pFont;
    FontFilePtr file;
{
    PCFTableRec tables[32],
               *table;
    CARD32      mask,
                bit;
    int         ntables;
    int         size;
    CARD32      format;
    int         i;
    int         cur_table;
    int         prop_string_size;
    int         glyph_string_size;
    xCharInfo  *minbounds,
               *maxbounds;
    xCharInfo  *ink_minbounds,
               *ink_maxbounds;
    BitmapFontPtr  bitmapFont;
    int         nencodings;
    int         header_size;
    FontPropPtr offsetProps;
    int         prop_pad;
    char       *atom_name;
    int         glyph;
    int         offset;

    bitmapFont = (BitmapFontPtr) pFont->fontPrivate;
    if (bitmapFont->bitmapExtra) {
	minbounds = &bitmapFont->bitmapExtra->info.minbounds;
	maxbounds = &bitmapFont->bitmapExtra->info.maxbounds;
	ink_minbounds = &bitmapFont->bitmapExtra->info.ink_minbounds;
	ink_maxbounds = &bitmapFont->bitmapExtra->info.ink_maxbounds;
    } else {
	minbounds = &pFont->info.minbounds;
	maxbounds = &pFont->info.maxbounds;
	ink_minbounds = &pFont->info.ink_minbounds;
	ink_maxbounds = &pFont->info.ink_maxbounds;
    }
    offsetProps = (FontPropPtr) xalloc(pFont->info.nprops * sizeof(FontPropRec));
    if (!offsetProps)
	return AllocError;
    prop_string_size = 0;
    for (i = 0; i < pFont->info.nprops; i++) {
	offsetProps[i].name = prop_string_size;
	prop_string_size += strlen(pcfNameForAtom(pFont->info.props[i].name)) + 1;
	if (pFont->info.isStringProp[i]) {
	    offsetProps[i].value = prop_string_size;
	    prop_string_size += strlen(pcfNameForAtom(pFont->info.props[i].value)) + 1;
	} else
	    offsetProps[i].value = pFont->info.props[i].value;
    }
    format = PCF_FORMAT(pFont->bit, pFont->byte, pFont->glyph, pFont->scan);
    mask = 0xFFFFFFF;
    ntables = 0;
    table = tables;
    while (mask) {
	bit = lowbit(mask);
	mask &= ~bit;
	table->type = bit;
	switch (bit) {
	case PCF_PROPERTIES:
	    table->format = PCF_DEFAULT_FORMAT | format;
	    size = S32 + S32 + (S32 + S8 + S32) * pFont->info.nprops;
	    prop_pad = Pad(size);
	    table->size = RoundUp(size) + S32 +
		RoundUp(prop_string_size);
	    table++;
	    break;
	case PCF_ACCELERATORS:
	    if (bitmapFont->bitmapExtra->info.inkMetrics)
		table->format = PCF_ACCEL_W_INKBOUNDS | format;
	    else
		table->format = PCF_DEFAULT_FORMAT | format;
	    table->size = 100;
	    table++;
	    break;
	case PCF_METRICS:
	    if (CanCompressMetrics(minbounds, maxbounds)) {
		table->format = PCF_COMPRESSED_METRICS | format;
		size = S32 + S16 + bitmapFont->num_chars * (5 * S8);
		table->size = RoundUp(size);
	    } else {
		table->format = PCF_DEFAULT_FORMAT | format;
		table->size = S32 + S32 + bitmapFont->num_chars * (6 * S16);
	    }
	    table++;
	    break;
	case PCF_BITMAPS:
	    table->format = PCF_DEFAULT_FORMAT | format;
	    size = S32 + S32 + bitmapFont->num_chars * S32 +
		GLYPHPADOPTIONS * S32 +
		bitmapFont->bitmapExtra->bitmapsSizes[PCF_GLYPH_PAD_INDEX(format)];
	    table->size = RoundUp(size);
	    table++;
	    break;
	case PCF_INK_METRICS:
	    if (bitmapFont->ink_metrics) {
		if (CanCompressMetrics(ink_minbounds, ink_maxbounds)) {
		    table->format = PCF_COMPRESSED_METRICS | format;
		    size = S32 + S16 + bitmapFont->num_chars * (5 * S8);
		    table->size = RoundUp(size);
		} else {
		    table->format = PCF_DEFAULT_FORMAT | format;
		    table->size = S32 + S32 + bitmapFont->num_chars * (6 * S16);
		}
		table++;
	    }
	    break;
	case PCF_BDF_ENCODINGS:
	    table->format = PCF_DEFAULT_FORMAT | format;
	    nencodings = (pFont->info.lastRow - pFont->info.firstRow + 1) *
		(pFont->info.lastCol - pFont->info.firstCol + 1);
	    size = S32 + 5 * S16 + nencodings * S16;
	    table->size = RoundUp(size);
	    table++;
	    break;
	case PCF_SWIDTHS:
	    table->format = PCF_DEFAULT_FORMAT | format;
	    table->size = S32 + S32 + bitmapFont->num_chars * S32;
	    table++;
	    break;
	case PCF_GLYPH_NAMES:
	    table->format = PCF_DEFAULT_FORMAT | format;
	    glyph_string_size = 0;
	    for (i = 0; i < bitmapFont->num_chars; i++)
		glyph_string_size += strlen(pcfNameForAtom(bitmapFont->bitmapExtra->glyphNames[i])) + 1;
	    table->size = S32 + S32 + bitmapFont->num_chars * S32 +
		S32 + RoundUp(glyph_string_size);
	    table++;
	    break;
	case PCF_BDF_ACCELERATORS:
	    if (pFont->info.inkMetrics)
		table->format = PCF_ACCEL_W_INKBOUNDS | format;
	    else
		table->format = PCF_DEFAULT_FORMAT | format;
	    table->size = 100;
	    table++;
	    break;
	}
    }
    ntables = table - tables;
    offset = 0;
    header_size = S32 + S32 + ntables * (4 * S32);
    offset = header_size;
    for (cur_table = 0, table = tables;
	    cur_table < ntables;
	    cur_table++, table++) {
	table->offset = offset;
	offset += table->size;
    }
    current_position = 0;
    pcfWriteTOC(file, tables, ntables);
    for (cur_table = 0, table = tables;
	    cur_table < ntables;
	    cur_table++, table++) {
	if (current_position > table->offset) {
	    printf("can't go backwards... %d > %d\n",
		   current_position, table->offset);
	    return BadFontName;
	}
	while (current_position < table->offset)
	    pcfPutINT8(file, format, '\0');
	pcfPutLSB32(file, table->format);
	switch (table->type) {
	case PCF_PROPERTIES:
	    pcfPutINT32(file, format, pFont->info.nprops);
	    for (i = 0; i < pFont->info.nprops; i++) {
		pcfPutINT32(file, format, offsetProps[i].name);
		pcfPutINT8(file, format, pFont->info.isStringProp[i]);
		pcfPutINT32(file, format, offsetProps[i].value);
	    }
	    for (i = 0; i < prop_pad; i++)
		pcfPutINT8(file, format, 0);
	    pcfPutINT32(file, format, prop_string_size);
	    for (i = 0; i < pFont->info.nprops; i++) {
		atom_name = pcfNameForAtom(pFont->info.props[i].name);
		pcfWrite(file, atom_name, strlen(atom_name) + 1);
		if (pFont->info.isStringProp[i]) {
		    atom_name = pcfNameForAtom(pFont->info.props[i].value);
		    pcfWrite(file, atom_name, strlen(atom_name) + 1);
		}
	    }
	    break;
	case PCF_ACCELERATORS:
	    pcfPutAccel(file, table->format, &bitmapFont->bitmapExtra->info);
	    break;
	case PCF_METRICS:
	    if (PCF_FORMAT_MATCH(table->format, PCF_COMPRESSED_METRICS)) {
		pcfPutINT16(file, format, bitmapFont->num_chars);
		for (i = 0; i < bitmapFont->num_chars; i++)
		    pcfPutCompressedMetric(file, format, &bitmapFont->metrics[i].metrics);
	    } else {
		pcfPutINT32(file, format, bitmapFont->num_chars);
		for (i = 0; i < bitmapFont->num_chars; i++)
		    pcfPutMetric(file, format, &bitmapFont->metrics[i].metrics);
	    }
	    break;
	case PCF_BITMAPS:
	    pcfPutINT32(file, format, bitmapFont->num_chars);
	    glyph = PCF_GLYPH_PAD(format);
	    offset = 0;
	    for (i = 0; i < bitmapFont->num_chars; i++) {
		pcfPutINT32(file, format, offset);
		offset += BYTES_FOR_GLYPH(&bitmapFont->metrics[i], glyph);
	    }
	    for (i = 0; i < GLYPHPADOPTIONS; i++) {
		pcfPutINT32(file, format,
			    bitmapFont->bitmapExtra->bitmapsSizes[i]);
	    }
	    for (i = 0; i < bitmapFont->num_chars; i++)
		pcfPutBitmap(file, format, &bitmapFont->metrics[i]);
	    break;
	case PCF_INK_METRICS:
	    if (PCF_FORMAT_MATCH(table->format, PCF_COMPRESSED_METRICS)) {
		pcfPutINT16(file, format, bitmapFont->num_chars);
		for (i = 0; i < bitmapFont->num_chars; i++)
		    pcfPutCompressedMetric(file, format, &bitmapFont->ink_metrics[i]);
	    } else {
		pcfPutINT32(file, format, bitmapFont->num_chars);
		for (i = 0; i < bitmapFont->num_chars; i++)
		    pcfPutMetric(file, format, &bitmapFont->ink_metrics[i]);
	    }
	    break;
	case PCF_BDF_ENCODINGS:
	    pcfPutINT16(file, format, pFont->info.firstCol);
	    pcfPutINT16(file, format, pFont->info.lastCol);
	    pcfPutINT16(file, format, pFont->info.firstRow);
	    pcfPutINT16(file, format, pFont->info.lastRow);
	    pcfPutINT16(file, format, pFont->info.defaultCh);
	    for (i = 0; i < nencodings; i++) {
		if (bitmapFont->encoding[i])
		    pcfPutINT16(file, format, bitmapFont->encoding[i] - bitmapFont->metrics);
		else
		    pcfPutINT16(file, format, 0xFFFF);
	    }
	    break;
	case PCF_SWIDTHS:
	    pcfPutINT32(file, format, bitmapFont->num_chars);
	    for (i = 0; i < bitmapFont->num_chars; i++)
		pcfPutINT32(file, format, bitmapFont->bitmapExtra->sWidths[i]);
	    break;
	case PCF_GLYPH_NAMES:
	    pcfPutINT32(file, format, bitmapFont->num_chars);
	    offset = 0;
	    for (i = 0; i < bitmapFont->num_chars; i++) {
		pcfPutINT32(file, format, offset);
		offset += strlen(pcfNameForAtom(bitmapFont->bitmapExtra->glyphNames[i])) + 1;
	    }
	    pcfPutINT32(file, format, offset);
	    for (i = 0; i < bitmapFont->num_chars; i++) {
		atom_name = pcfNameForAtom(bitmapFont->bitmapExtra->glyphNames[i]);
		pcfWrite(file, atom_name, strlen(atom_name) + 1);
	    }
	    break;
	case PCF_BDF_ACCELERATORS:
	    pcfPutAccel(file, table->format, &pFont->info);
	    break;
	}
    }
    return Successful;
}