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incubator-nuttx/tools/bdf-converter.c

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/****************************************************************************
* tools/bdf-converter.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/* Based one the "Glyph Bitmap Distribution Format (BDF) Specification",
* Version 2.2, by Adobe Systems Incorporated.
*/
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <ctype.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#if 0
# define VERBOSE
# define DBG
#endif
/* BDF Specification Version 2.2:
* This version lifts the restriction on line length. In this version,
* the new maximum length of a value of the type string is 65535 characters,
* and hence lines may now be at least this long.
*/
#define BDF_MAX_LINE_LENGTH 65535
/* Ranges of 7-bit and 8-bit fonts */
#define NXFONT_MIN7BIT 33
#define NXFONT_MAX7BIT 126
#define NXFONT_MIN8BIT 161
#define NXFONT_MAX8BIT 255
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure holds information about a glyph */
typedef struct glyphinfo_s
{
char *name; /* Name for they glyph */
int encoding; /* The Adobe Standard Encoding value */
int dw_x0; /* Width in x of the vector indicating
* the position of the next glyph's origin
* relative to the origin of this glyph */
int dw_y0; /* Width in y of the vector indicating
* the position of the next glyph's origin
* relative to the origin of this glyph */
int bb_w; /* The width of the black pixels in x */
int bb_h; /* The height of the black pixels in y */
int bb_x_off; /* X displacement of the lower left corner
* of the bitmap from origin 0 */
int bb_y_off; /* Y displacement of the lower left corner
* of the bitmap from origin 0 */
uint64_t *bitmap; /* Hexadecimal data for the character bitmap */
} glyphinfo_t;
/* This structures provides the metrics for one glyph */
typedef struct nx_fontmetric_s
{
uint32_t stride : 3; /* Width of one font row in bytes */
uint32_t width : 6; /* Width of the font in bits */
uint32_t height : 6; /* Height of the font in rows */
uint32_t xoffset : 6; /* Top, left-hand corner X-offset in pixels */
uint32_t yoffset : 6; /* Top, left-hand corner y-offset in pixels */
uint32_t unused : 5;
} nx_fontmetric_t;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: my_strtok_r
*
* Description:
* MinGW does not seem to provide strtok_r
*
****************************************************************************/
#ifndef HAVE_STRTOK_R
static char *my_strtok_r(char *str, const char *delim, char **saveptr)
{
char *pbegin;
char *pend = NULL;
/* Decide if we are starting a new string or continuing from
* the point we left off.
*/
if (str)
{
pbegin = str;
}
else if (saveptr && *saveptr)
{
pbegin = *saveptr;
}
else
{
return NULL;
}
/* Find the beginning of the next token */
for (;
*pbegin && strchr(delim, *pbegin) != NULL;
pbegin++);
/* If we are at the end of the string with nothing
* but delimiters found, then return NULL.
*/
if (!*pbegin)
{
return NULL;
}
/* Find the end of the token */
for (pend = pbegin + 1;
*pend && strchr(delim, *pend) == NULL;
pend++);
/* pend either points to the end of the string or to
* the first delimiter after the string.
*/
if (*pend)
{
/* Turn the delimiter into a null terminator */
*pend++ = '\0';
}
/* Save the pointer where we left off and return the
* beginning of the token.
*/
if (saveptr)
{
*saveptr = pend;
}
return pbegin;
}
#undef strtok_r
#define strtok_r my_strtok_r
#endif
/****************************************************************************
* Name: trimline
*
* Description:
* Trims the line removing space characters at the front and at the end
* of the line.
*
* Input Parameters:
* line - The line to trim
*
****************************************************************************/
static void trimline(char *line)
{
char *str;
str = line;
char *strend;
for (strend = str + strlen(str) - 1;
strend >= str && isspace((int)(*strend));
strend--);
*(strend + 1) = 0;
}
/****************************************************************************
* Name: bdf_parseIntLine
*
* Description:
* Parses a line containing a BDF property followed by integers. It will
* ignore the first token that corresponds to the property name.
*
* Input Parameters:
* line - A line with a BDF property followed by integers, i.e.:
* "FONTBOUNDINGBOX 8 13 0 -2"
* count - How many integers are specified by the BDF property. In the
* example above, count = 4.
* info - A pointer to memory provided by the caller in which to
* return the array of integers. For the example above:
* info[0] = 8
* info[1] = 13
* info[2] = 0
* info[3] = -2
*
****************************************************************************/
static void bdf_parseintline(char *line, unsigned int count, int *info)
{
char *str;
char *token;
char *saveptr1;
str = line;
/* Ignore the key */
token = (char *)strtok_r(str, " ", &saveptr1);
while ((token = (char *)strtok_r(NULL, " ", &saveptr1)) && count--)
{
*(info++) = atoi(token);
}
}
/****************************************************************************
* Name: bdf_printglyphinfo
*
* Description:
* Prints the information available for a glyph.
*
* Input Parameters:
* ginfo - A glyphinfo_t struct with the glyph's information.
*
****************************************************************************/
#ifdef DBG
static void bdf_printglyphinfo(const glyphinfo_t *ginfo)
{
printf("NAME = %s\n", ginfo->name);
printf("ENCODING = %d\n", ginfo->encoding);
printf("DW_X0 = %d\n", ginfo->dw_x0);
printf("DW_Y0 = %d\n", ginfo->dw_y0);
printf("BB_W = %d\n", ginfo->bb_w);
printf("BB_H = %d\n", ginfo->bb_h);
printf("BB_X_OFF = %d\n", ginfo->bb_x_off);
printf("BB_Y_OFF = %d\n", ginfo->bb_y_off);
int i;
for (i = 0; i < ginfo->bb_h; i++)
{
printf("BITMAP[%d] = %x\n", i, ginfo->bitmap[i]);
}
}
#endif /* DBG */
/****************************************************************************
* Name: bdf_printnxmetricinfo
*
* Description:
* Prints the information available for a glyph's metric in the NX
* graphics system.
*
* Input Parameters:
* info - A nx_fontmetric_t struct with the glyph's information.
*
****************************************************************************/
#ifdef DBG
static void bdf_printnxmetricinfo(const nx_fontmetric_t *info)
{
printf("STRIDE = %d\n", info->stride);
printf("WIDTH = %d\n", info->width);
printf("HEIGHT = %d\n", info->height);
printf("XOFFSET = %d\n", info->xoffset);
printf("YOFFSET = %d\n", info->yoffset);
}
#endif /* DBG */
/****************************************************************************
* Name: bdf_getglyphinfo
*
* Description:
* Obtains the information for an individual glyph. The BDF properties
* taken into account are:
* - ENCODING
* - DWIDTH
* - BBX
* BDF properties ignored:
* - SWIDTH
* - SWIDTH1
* - DWIDTH1
* - VVECTOR
*
* Input Parameters:
* file - The input file stream pointing to the first line of the
* glyph's information (right after STARTCHAR).
* ginfo - A glyphinfo_t struct to fill with the glyph's information.
*
****************************************************************************/
static void bdf_getglyphinfo(FILE *file, glyphinfo_t *ginfo)
{
char line[BDF_MAX_LINE_LENGTH];
char linecopy[BDF_MAX_LINE_LENGTH];
char *str;
char *token;
char *saveptr1;
bool done;
done = false;
while (fgets(line, BDF_MAX_LINE_LENGTH, file) != NULL && !done)
{
trimline(line);
strcpy(linecopy, line);
str = line;
while ((token = (char *)strtok_r(str, " ", &saveptr1)))
{
/* ENCODING information */
if (strcmp(token, "ENCODING") == 0)
{
token = (char *)strtok_r(NULL, " ", &saveptr1);
ginfo->encoding = atoi(token);
}
/* DWIDTH information */
if (strcmp(token, "DWIDTH") == 0)
{
token = (char *)strtok_r(NULL, " ", &saveptr1);
ginfo->dw_x0 = atoi(token);
token = (char *)strtok_r(NULL, " ", &saveptr1);
ginfo->dw_y0 = atoi(token);
}
/* BBX information */
else if (strcmp(token, "BBX") == 0)
{
int bbxinfo[4];
bdf_parseintline(linecopy, 4, bbxinfo);
ginfo->bb_w = bbxinfo[0];
ginfo->bb_h = bbxinfo[1];
ginfo->bb_x_off = bbxinfo[2];
ginfo->bb_y_off = bbxinfo[3];
/* This is the last BDF property of interest */
done = true;
}
str = NULL;
}
}
}
/****************************************************************************
* Name: bdf_getglyphbitmap
*
* Description:
* Obtains the character bitmap information for an individual glyph.
*
* Input Parameters:
* file - The input file stream pointing to the first line of the
* glyph's bitmap (right after BITMAP).
* ginfo - A glyphinfo_t struct to fill with the glyph's bitmap.
*
****************************************************************************/
static void bdf_getglyphbitmap(FILE *file, glyphinfo_t *ginfo)
{
char line[BDF_MAX_LINE_LENGTH];
uint64_t *bitmap;
bool readingbitmap;
bitmap = ginfo->bitmap;
readingbitmap = true;
while (readingbitmap)
{
if (fgets(line, BDF_MAX_LINE_LENGTH, file) != NULL)
{
trimline(line);
if (strcmp(line, "ENDCHAR") == 0)
{
readingbitmap = false;
}
else
{
char *endptr;
*bitmap = strtoul(line, &endptr, 16);
bitmap++;
}
}
else
{
/* error condition */
readingbitmap = false;
}
}
}
/****************************************************************************
* Name: bdf_getstride
*
* Description:
* Obtains the stride for an individual glyph. The stride is the width
* of one glyph's bitmap row in bytes.
*
* Input Parameters:
* ginfo - A glyphinfo_t struct with the glyph's information.
* stride - A pointer to memory provided by the caller in which to
* return the stride.
*
****************************************************************************/
static void bdf_getstride(glyphinfo_t *ginfo, uint32_t *stride)
{
*stride = (ginfo->bb_w % 8 == 0) ? ginfo->bb_w / 8 : ginfo->bb_w / 8 + 1;
}
/****************************************************************************
* Name: bdf_printoutput
*
* Description:
* Prints to the output stream the information of an individual glyph in
* the NuttX font format.
*
* Input Parameters:
* out - The output stream.
* ginfo - A glyphinfo_t struct with the glyph's information.
* nxmetric - A nx_fontmetric_t struct with the glyph's information.
*
****************************************************************************/
static void bdf_printoutput(FILE *out,
glyphinfo_t *ginfo,
nx_fontmetric_t *nxmetric)
{
int i;
int j;
/* Only interested in the 7 and 8 bit ranges */
if ((ginfo->encoding >= NXFONT_MIN7BIT &&
ginfo->encoding <= NXFONT_MAX7BIT) ||
(ginfo->encoding >= NXFONT_MIN8BIT &&
ginfo->encoding <= NXFONT_MAX8BIT))
{
/* Glyph general info */
if (ginfo->bb_x_off < 0)
{
fprintf(out,
"/* %s (%d) -- NOTE: Xoffset should be %d, not 0. */\n",
ginfo->name,
ginfo->encoding,
ginfo->bb_x_off);
}
else
{
fprintf(out, "/* %s (%d) */\n", ginfo->name, ginfo->encoding);
}
/* Glyph metrics */
fprintf(out,
"#define NXFONT_METRICS_%d {%d, %d, %d, %d, %d, 0}\n",
ginfo->encoding,
nxmetric->stride,
nxmetric->width,
nxmetric->height,
nxmetric->xoffset,
nxmetric->yoffset);
/* Glyph bitmap */
fprintf(out, "#define NXFONT_BITMAP_%d {", ginfo->encoding);
for (i = 0; i < ginfo->bb_h - 1; i++)
{
for (j = 1; j <= nxmetric->stride; j++)
{
int nxbyteoffset;
uint8_t nxbyte = 0;
uint64_t tempbitmap = ginfo->bitmap[i];
/* Get the next byte */
nxbyteoffset = (nxmetric->stride - j) * 8;
nxbyte = (uint8_t)(tempbitmap >> nxbyteoffset);
fprintf(out, "0x%x, ", nxbyte);
}
}
/* Different behavior for the last bitmap */
for (j = 1; j <= nxmetric->stride; j++)
{
int nxbyteoffset;
uint8_t nxbyte = 0;
uint64_t tempbitmap = ginfo->bitmap[i];
/* Get the next byte */
nxbyteoffset = (nxmetric->stride - j) * 8;
nxbyte = (uint8_t)(tempbitmap >> nxbyteoffset);
if (j == nxmetric->stride)
{
fprintf(out, "0x%x}\n", nxbyte);
}
else
{
fprintf(out, "0x%x, ", nxbyte);
}
}
fprintf(out, "\n");
}
}
/****************************************************************************
* Main
****************************************************************************/
int main(int argc, char **argv)
{
FILE *file, *out;
char line[BDF_MAX_LINE_LENGTH];
char linecopy[BDF_MAX_LINE_LENGTH];
char *str;
char *token;
char *saveptr1;
char *input;
char *output;
/* FONTBOUNDINGBOX properties */
int fbb_x = 0;
int fbb_y = 0;
int fbb_y_off = 0;
/* int fbb_x_off = 0; */
/* Input BDF file */
input = argv[1];
if (input == NULL)
{
printf("%s: no input file\n", argv[0]);
exit(0);
}
file = fopen(input, "r");
if (file == NULL)
{
printf("%s: error opening file %s\n", argv[0], input);
exit(0);
}
else
{
#ifdef VERBOSE
printf("Opening \"%s\"\n", input);
#endif /* VERBOSE */
}
/* Output file */
if (argv[2])
{
output = argv[2];
}
else
{
output = "nxfonts_myfont.h";
}
out = fopen(output, "w");
if (out == NULL)
{
printf("%s: error opening file %s\n", argv[0], output);
fclose(file);
exit(0);
}
else
{
while (fgets(line, BDF_MAX_LINE_LENGTH, file) != NULL)
{
#ifdef DBG
printf("--\n");
#endif /* DBG */
/* Save a copy of the line */
strcpy(linecopy, line);
/* Clean it */
trimline(line);
str = line;
while ((token = (char *)strtok_r(str, " ", &saveptr1)))
{
/* FONTBOUNDINGBOX - Global font information */
if (strcmp(token, "FONTBOUNDINGBOX") == 0)
{
int fbbinfo[4];
bdf_parseintline(linecopy, 4, fbbinfo);
fbb_x = fbbinfo[0];
fbb_y = fbbinfo[1];
/* fbb_x_off = fbbinfo[2]; */
fbb_y_off = fbbinfo[3];
/* Print FONTBOUNDINGBOX information */
fprintf(out, "/* Maximum height and width of any");
fprintf(out, " glyph in the set */\n\n");
fprintf(out, "#define NXFONT_MAXHEIGHT %d\n", fbb_y);
fprintf(out, "#define NXFONT_MAXWIDTH %d\n\n", fbb_x);
}
/* STARTCHAR - Individual glyph information */
if (strcmp(token, "STARTCHAR") == 0)
{
glyphinfo_t ginfo;
/* Glyph name */
ginfo.name = (char *)strtok_r(NULL, " ", &saveptr1);
#ifdef VERBOSE
printf("Processing glyph: %s\n", ginfo.name);
#endif /* VERBOSE */
/* Glyph information:
* ENCODING
* DWIDTH
* BBX
*/
ginfo.encoding = 0;
ginfo.dw_x0 = 0;
ginfo.dw_y0 = 0;
ginfo.bb_w = 0;
ginfo.bb_h = 0;
ginfo.bb_x_off = 0;
ginfo.bb_y_off = 0;
bdf_getglyphinfo(file, &ginfo);
/* Glyph bitmap */
ginfo.bitmap = malloc(sizeof(uint64_t) * ginfo.bb_h);
bdf_getglyphbitmap(file, &ginfo);
#ifdef DBG
bdf_printglyphinfo(&ginfo);
#endif /* DBG */
/* Convert to nxfonts */
nx_fontmetric_t nxmetric;
uint32_t stride;
bdf_getstride(&ginfo, &stride);
nxmetric.stride = stride;
nxmetric.width = ginfo.bb_w;
nxmetric.height = ginfo.bb_h;
/* The NuttX font format does not support
* negative X offsets.
*/
if (ginfo.bb_x_off < 0)
{
nxmetric.xoffset = 0;
printf("%s: ignoring negative x offset for "
"glyph '%s' (%d)\n",
argv[0],
ginfo.name,
ginfo.encoding);
}
else
{
nxmetric.xoffset = ginfo.bb_x_off;
}
nxmetric.yoffset = fbb_y + fbb_y_off -
ginfo.bb_y_off - ginfo.bb_h;
#ifdef DBG
bdf_printnxmetricinfo(&nxmetric);
#endif /* DBG */
/* The space (32) character is treated differently */
if (ginfo.encoding == 32)
{
fprintf(out, "/* The width of a space */\n\n");
fprintf(out, "#define NXFONT_SPACEWIDTH %d\n\n",
ginfo.dw_x0);
}
else
{
bdf_printoutput(out, &ginfo, &nxmetric);
}
/* Free memory */
free(ginfo.bitmap);
}
str = NULL;
}
}
fclose(file);
fclose(out);
/* The End */
printf("Generated \"%s\"\n", output);
}
return EXIT_SUCCESS;
}
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