mirror of
git://projects.qi-hardware.com/antorcha.git
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tools/libtxt/: text composition library (WIP)
This commit is contained in:
Werner Almesberger
parent
f9e253963b
commit
2514c0891a
31
tools/libtxt/Makefile
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31
tools/libtxt/Makefile
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#
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# tools/libtxt/Makefile - Build the Antorcha tool
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#
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# Written 2012 by Werner Almesberger
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# Copyright 2012 Werner Almesberger
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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MAIN = libtxt.a
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CFLAGS = -g -Wall
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OBJS = font.o
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.PHONY: all clean spotless
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all: $(MAIN)
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$(MAIN): $(OBJS)
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$(CC) $(CFLAGS) -o $@ $(OBJS)
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clean:
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rm -f $(OBJS)
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spotless: clean
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rm -f $(MAIN)
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251
tools/libtxt/font.c
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251
tools/libtxt/font.c
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/*
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* tools/libtxt/font.c - Font operations
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#define _GNU_SOURCE /* for vasprintf */
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "libtxt.h"
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static const char charset[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!?$%+-*/=@";
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#define CHARS (sizeof(charset)-1)
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struct sym {
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int x, y;
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int w, h;
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};
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struct font {
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int w, h;
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int span; /* bytes per row */
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struct sym sym[CHARS];
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uint8_t *data;
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};
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static struct font font;
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static const char *alloc_sprintf(const char *fmt, ...)
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{
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va_list ap;
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char *tmp, *res;
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int n;
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va_start(ap, fmt);
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n = vasprintf(&tmp, fmt, ap);
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va_end(ap);
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if (n < 0)
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abort();
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res = malloc(n+1);
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if (!res)
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abort();
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memcpy(res, tmp, n+1);
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return res;
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}
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static const char *read_font_file(FILE *file)
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{
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int n;
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unsigned v;
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char c;
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int bytes = 0;
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free(font.data);
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font.data = NULL;
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n = fscanf(file, "#define %*[^_]_width %d\n", &font.w);
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if (n < 0)
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return alloc_sprintf("reading width: %s", strerror(errno));
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if (n != 1)
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return alloc_sprintf("width not found (%d)", n);
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n = fscanf(file, "#define %*[^_]_height %d\n", &font.h);
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if (n < 0)
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return alloc_sprintf("reading height: %s", strerror(errno));
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if (n != 1)
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return alloc_sprintf("height not found");
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n = fscanf(file, "%*[^{]{\n");
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if (n < 0)
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return alloc_sprintf("finding data: %s", strerror(errno));
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while (1) {
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n = fscanf(file, " 0x%x%c", &v, &c);
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if (n < 0)
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return alloc_sprintf("reading data: %s",
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strerror(errno));
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if (n != 2)
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return alloc_sprintf("data not found (%d)", n);
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bytes++;
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font.data = realloc(font.data, bytes);
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if (!font.data)
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abort();
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font.data[bytes-1] = v;
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if (c == ',')
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continue;
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if (c == '}')
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break;
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return alloc_sprintf("invalid data syntax");
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}
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font.span = (font.w+7) >> 3;
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if (bytes != font.h*font.span)
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return alloc_sprintf("%d bytes for %dx%d bitmap",
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bytes, font.h, font.w);
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return NULL;
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}
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static void set_block(int *n, int xlast, int x, int y0, int y1)
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{
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font.sym[*n].x = xlast+1;
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font.sym[*n].y = y0;
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font.sym[*n].w = x-xlast-1;
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font.sym[*n].h = y1-y0+1;
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(*n)++;
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}
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static void analyze_block(int *n, int y0, int y1)
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{
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int x, y, last = -1;
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for (x = 0; x != font.w; x++) {
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for (y = y0; y <= y1; y++)
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if (font.data[y*font.span+(x >> 3)] & (1 << (x & 7)))
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break;
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if (y <= y1)
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continue;
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if (x != last+1)
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set_block(n, last, x, y0, y1);
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last = x;
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}
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if (x != last+1)
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set_block(n, last, x, y0, y1);
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}
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static const char *analyze_font(void)
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{
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int x, y, last = -1;
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int n = 0;
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for (y = 0; y != font.h; y++) {
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for (x = 0; x != font.span; x++)
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if (font.data[y*font.span+x])
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break;
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if (x != font.span)
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continue;
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if (y != last+1)
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analyze_block(&n, last+1, y-1);
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last = y;
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}
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if (y != last+1)
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analyze_block(&n, last+1, y-1);
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if (n != CHARS)
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return alloc_sprintf("found %d instead of %d characters",
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n, CHARS);
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return NULL;
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}
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const char *load_font(const char *name)
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{
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FILE *file;
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const char *error;
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file = fopen(name, "r");
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if (!file)
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return alloc_sprintf("%s: %s", name, strerror(errno));
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error = read_font_file(file);
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fclose(file);
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if (error)
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return error;
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return analyze_font();
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}
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int draw_char(void *canvas, int width, int height, char c, int x, int y)
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{
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uint8_t *p = canvas;
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const char *cp;
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const struct sym *sym;
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int ix, iy, xt;
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cp = strchr(charset, c);
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if (!cp)
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return 0;
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sym = font.sym+(cp-charset);
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for (ix = 0; ix != sym->w; ix++) {
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if (x+ix >= width)
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continue;
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for (iy = 0; iy != sym->h; iy++) {
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if (y+iy >= height)
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continue;
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xt = sym->x+ix;
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if (font.data[(sym->y+iy)*font.span+(xt >> 3)] &
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(1 << (xt & 7))) {
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xt = x+ix;
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p[((y+iy)*width+xt) >> 3] |= 1 << (xt & 7);
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}
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}
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}
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return sym->w;
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}
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#define W 64
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#define H 20
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int main(int argc, char **argv)
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{
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const char *error;
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uint8_t canvas[W*H/8] = { 0 };
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char *s;
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int x, xo, y;
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error = load_font(argv[1]);
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if (error) {
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fprintf(stderr, "%s\n", error);
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return 1;
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}
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x = 0;
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for (s = argv[2]; *s; s++) {
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xo = draw_char(canvas, W, H, *s, x, 0);
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if (xo)
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x += xo+1;
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}
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for (y = 0; y != H; y++) {
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for (x = 0; x != W; x++)
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if (canvas[(y*W+x) >> 3] & (1 << (x & 7)))
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putchar('#');
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else
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putchar('.');
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putchar('\n');
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}
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return 0;
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}
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54
tools/libtxt/libtxt.h
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54
tools/libtxt/libtxt.h
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@ -0,0 +1,54 @@
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/*
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* tools/libtxt/libtxt.h - Text processing functions
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef LIBTXT_H
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#define LIBTXT_H
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struct edit {
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enum edit_type {
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edit_string,
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edit_font,
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edit_xoff,
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edit_xpos,
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edit_yoff,
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edit_ypos,
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} type;
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union {
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const char *s;
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int n;
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} u;
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struct edit *next;
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};
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/*
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* Markup:
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*
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* <FONT fontname>
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* <IMG imagefile>
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* <X+offset> <X-offset> <X=pos>
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* <Y+offset> ...
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*
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* Empty lines are ignored. The newline of a line containing only markup is
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* also ignored.
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*
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* Newline leaves one
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*/
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const char *load_font(const char *name);
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int draw_char(void *canvas, int width, int height, char c, int x, int y);
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struct edit *text2edit(const char *s);
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char *edit2text(const struct edit *e);
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void *apply_edits(int width, int height, const struct edit *e);
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#endif /* !LIBTXT_H */
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