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mirror of git://projects.qi-hardware.com/antorcha.git synced 2024-11-22 07:09:23 +02:00

tools/libtxt/: text composition library (WIP)

This commit is contained in:
Werner Almesberger 2012-06-29 21:04:11 -03:00
parent f9e253963b
commit 2514c0891a
3 changed files with 336 additions and 0 deletions

31
tools/libtxt/Makefile Normal file
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#
# tools/libtxt/Makefile - Build the Antorcha tool
#
# Written 2012 by Werner Almesberger
# Copyright 2012 Werner Almesberger
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
MAIN = libtxt.a
CFLAGS = -g -Wall
OBJS = font.o
.PHONY: all clean spotless
all: $(MAIN)
$(MAIN): $(OBJS)
$(CC) $(CFLAGS) -o $@ $(OBJS)
clean:
rm -f $(OBJS)
spotless: clean
rm -f $(MAIN)

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tools/libtxt/font.c Normal file
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/*
* tools/libtxt/font.c - Font operations
*
* Written 2012 by Werner Almesberger
* Copyright 2012 Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#define _GNU_SOURCE /* for vasprintf */
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "libtxt.h"
static const char charset[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!?$%+-*/=@";
#define CHARS (sizeof(charset)-1)
struct sym {
int x, y;
int w, h;
};
struct font {
int w, h;
int span; /* bytes per row */
struct sym sym[CHARS];
uint8_t *data;
};
static struct font font;
static const char *alloc_sprintf(const char *fmt, ...)
{
va_list ap;
char *tmp, *res;
int n;
va_start(ap, fmt);
n = vasprintf(&tmp, fmt, ap);
va_end(ap);
if (n < 0)
abort();
res = malloc(n+1);
if (!res)
abort();
memcpy(res, tmp, n+1);
return res;
}
static const char *read_font_file(FILE *file)
{
int n;
unsigned v;
char c;
int bytes = 0;
free(font.data);
font.data = NULL;
n = fscanf(file, "#define %*[^_]_width %d\n", &font.w);
if (n < 0)
return alloc_sprintf("reading width: %s", strerror(errno));
if (n != 1)
return alloc_sprintf("width not found (%d)", n);
n = fscanf(file, "#define %*[^_]_height %d\n", &font.h);
if (n < 0)
return alloc_sprintf("reading height: %s", strerror(errno));
if (n != 1)
return alloc_sprintf("height not found");
n = fscanf(file, "%*[^{]{\n");
if (n < 0)
return alloc_sprintf("finding data: %s", strerror(errno));
while (1) {
n = fscanf(file, " 0x%x%c", &v, &c);
if (n < 0)
return alloc_sprintf("reading data: %s",
strerror(errno));
if (n != 2)
return alloc_sprintf("data not found (%d)", n);
bytes++;
font.data = realloc(font.data, bytes);
if (!font.data)
abort();
font.data[bytes-1] = v;
if (c == ',')
continue;
if (c == '}')
break;
return alloc_sprintf("invalid data syntax");
}
font.span = (font.w+7) >> 3;
if (bytes != font.h*font.span)
return alloc_sprintf("%d bytes for %dx%d bitmap",
bytes, font.h, font.w);
return NULL;
}
static void set_block(int *n, int xlast, int x, int y0, int y1)
{
font.sym[*n].x = xlast+1;
font.sym[*n].y = y0;
font.sym[*n].w = x-xlast-1;
font.sym[*n].h = y1-y0+1;
(*n)++;
}
static void analyze_block(int *n, int y0, int y1)
{
int x, y, last = -1;
for (x = 0; x != font.w; x++) {
for (y = y0; y <= y1; y++)
if (font.data[y*font.span+(x >> 3)] & (1 << (x & 7)))
break;
if (y <= y1)
continue;
if (x != last+1)
set_block(n, last, x, y0, y1);
last = x;
}
if (x != last+1)
set_block(n, last, x, y0, y1);
}
static const char *analyze_font(void)
{
int x, y, last = -1;
int n = 0;
for (y = 0; y != font.h; y++) {
for (x = 0; x != font.span; x++)
if (font.data[y*font.span+x])
break;
if (x != font.span)
continue;
if (y != last+1)
analyze_block(&n, last+1, y-1);
last = y;
}
if (y != last+1)
analyze_block(&n, last+1, y-1);
if (n != CHARS)
return alloc_sprintf("found %d instead of %d characters",
n, CHARS);
return NULL;
}
const char *load_font(const char *name)
{
FILE *file;
const char *error;
file = fopen(name, "r");
if (!file)
return alloc_sprintf("%s: %s", name, strerror(errno));
error = read_font_file(file);
fclose(file);
if (error)
return error;
return analyze_font();
}
int draw_char(void *canvas, int width, int height, char c, int x, int y)
{
uint8_t *p = canvas;
const char *cp;
const struct sym *sym;
int ix, iy, xt;
cp = strchr(charset, c);
if (!cp)
return 0;
sym = font.sym+(cp-charset);
for (ix = 0; ix != sym->w; ix++) {
if (x+ix >= width)
continue;
for (iy = 0; iy != sym->h; iy++) {
if (y+iy >= height)
continue;
xt = sym->x+ix;
if (font.data[(sym->y+iy)*font.span+(xt >> 3)] &
(1 << (xt & 7))) {
xt = x+ix;
p[((y+iy)*width+xt) >> 3] |= 1 << (xt & 7);
}
}
}
return sym->w;
}
#define W 64
#define H 20
int main(int argc, char **argv)
{
const char *error;
uint8_t canvas[W*H/8] = { 0 };
char *s;
int x, xo, y;
error = load_font(argv[1]);
if (error) {
fprintf(stderr, "%s\n", error);
return 1;
}
x = 0;
for (s = argv[2]; *s; s++) {
xo = draw_char(canvas, W, H, *s, x, 0);
if (xo)
x += xo+1;
}
for (y = 0; y != H; y++) {
for (x = 0; x != W; x++)
if (canvas[(y*W+x) >> 3] & (1 << (x & 7)))
putchar('#');
else
putchar('.');
putchar('\n');
}
return 0;
}

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tools/libtxt/libtxt.h Normal file
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/*
* tools/libtxt/libtxt.h - Text processing functions
*
* Written 2012 by Werner Almesberger
* Copyright 2012 Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef LIBTXT_H
#define LIBTXT_H
struct edit {
enum edit_type {
edit_string,
edit_font,
edit_xoff,
edit_xpos,
edit_yoff,
edit_ypos,
} type;
union {
const char *s;
int n;
} u;
struct edit *next;
};
/*
* Markup:
*
* <FONT fontname>
* <IMG imagefile>
* <X+offset> <X-offset> <X=pos>
* <Y+offset> ...
*
* Empty lines are ignored. The newline of a line containing only markup is
* also ignored.
*
* Newline leaves one
*/
const char *load_font(const char *name);
int draw_char(void *canvas, int width, int height, char c, int x, int y);
struct edit *text2edit(const char *s);
char *edit2text(const struct edit *e);
void *apply_edits(int width, int height, const struct edit *e);
#endif /* !LIBTXT_H */