mirror of
git://projects.qi-hardware.com/antorcha.git
synced 2024-11-22 13:22:48 +02:00
tools/libtxt/: text composition library (WIP)
This commit is contained in:
Werner Almesberger
parent
f9e253963b
commit
2514c0891a
31
tools/libtxt/Makefile
Normal file
31
tools/libtxt/Makefile
Normal file
@ -0,0 +1,31 @@
|
||||
#
|
||||
# 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 $(MAIN)
|
||||
251
tools/libtxt/font.c
Normal file
251
tools/libtxt/font.c
Normal file
@ -0,0 +1,251 @@
|
||||
/*
|
||||
* tools/libtxt/font.c - Font operations
|
||||
*
|
||||
* Written 2012 by Werner Almesberger
|
||||
* Copyright 2012 Werner Almesberger
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*/
|
||||
|
||||
|
||||
#define _GNU_SOURCE /* for vasprintf */
|
||||
#include <stdarg.h>
|
||||
#include <stdint.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
#include <errno.h>
|
||||
|
||||
#include "libtxt.h"
|
||||
|
||||
|
||||
static const char charset[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!?$%+-*/=@";
|
||||
|
||||
|
||||
#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;
|
||||
}
|
||||
54
tools/libtxt/libtxt.h
Normal file
54
tools/libtxt/libtxt.h
Normal file
@ -0,0 +1,54 @@
|
||||
/*
|
||||
* 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 */
|
||||
Loading…
Reference in New Issue
Block a user