mirror of
git://projects.qi-hardware.com/antorcha.git
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302 lines
5.6 KiB
C
302 lines
5.6 KiB
C
/*
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* tools/libant/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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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "util.h"
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#include "libant.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 image {
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int w, h;
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int span; /* bytes per row */
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uint8_t *data;
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};
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struct font {
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struct image *img;
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struct sym sym[CHARS];
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int max_width;
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};
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/* ----- XBM image --------------------------------------------------------- */
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static const char *read_xbm_file(FILE *file, struct image *img)
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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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img->data = NULL;
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n = fscanf(file, "#define %*[^_]_width %d\n", &img->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", &img->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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img->data = realloc(img->data, bytes);
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if (!img->data)
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abort();
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img->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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img->span = (img->w+7) >> 3;
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if (bytes != img->h*img->span)
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return alloc_sprintf("%d bytes for %dx%d bitmap",
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bytes, img->h, img->w);
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return NULL;
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}
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struct image *load_image_file(FILE *file, const char **error)
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{
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struct image *img;
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const char *err;
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img = alloc_type(struct image);
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err = read_xbm_file(file, img);
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if (err) {
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if (error)
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*error = err;
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free_image(img);
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return NULL;
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}
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return img;
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}
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struct image *load_image(const char *name, const char **error)
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{
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FILE *file;
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struct image *img;
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file = fopen(name, "r");
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if (!file) {
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if (error)
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*error = alloc_sprintf("%s: %s", name, strerror(errno));
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return NULL;
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}
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img = load_image_file(file, error);
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fclose(file);
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return img;
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}
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void free_image(struct image *img)
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{
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if (img) {
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free(img->data);
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free(img);
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}
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}
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/* ----- Font generation --------------------------------------------------- */
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static void set_block(struct font *font, int *n,
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int xlast, int x, int y0, int y1)
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{
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int width = x-xlast-1;
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if (width > font->max_width)
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font->max_width = width;
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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 = width;
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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(struct font *font, int *n, int y0, int y1)
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{
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const struct image *img = font->img;
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int x, y, last = -1;
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for (x = 0; x != img->w; x++) {
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for (y = y0; y <= y1; y++)
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if (img->data[y*img->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(font, 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(font, n, last, x, y0, y1);
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}
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static const char *analyze_font(struct font *font)
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{
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const struct image *img = font->img;
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int x, y, last = -1;
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int n = 0;
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for (y = 0; y != img->h; y++) {
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for (x = 0; x != img->span; x++)
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if (img->data[y*img->span+x])
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break;
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if (x != img->span)
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continue;
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if (y != last+1)
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analyze_block(font, &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(font, &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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struct font *make_font(struct image *img, const char **error)
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{
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struct font *font;
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const char *err;
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font = calloc(1, sizeof(struct font));
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if (!font)
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abort();
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font->img = img;
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err = analyze_font(font);
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if (err) {
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if (error)
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*error = err;
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free_font(font);
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return NULL;
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}
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return font;
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}
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void free_font(struct font *font)
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{
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if (font) {
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free_image(font->img);
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free(font);
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}
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}
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/* ----- Drawing on a canvas ----------------------------------------------- */
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static void do_draw(uint8_t *canvas, int width, int heigth,
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const struct image *img, int ox, int oy, int w, int h, int x, int y)
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{
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int ix, iy, xt;
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for (ix = 0; ix != w; ix++) {
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if (x+ix < 0 || x+ix >= width)
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continue;
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for (iy = 0; iy != h; iy++) {
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if (y+iy < 0 || y+iy >= heigth)
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continue;
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xt = ox+ix;
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if (img->data[(oy+iy)*img->span+(xt >> 3)] &
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(1 << (xt & 7))) {
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xt = x+ix;
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canvas[((y+iy)*width+xt) >> 3] |= 1 << (xt & 7);
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}
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}
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}
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}
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int draw_image(void *canvas, int width, int height,
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const struct image *img, int x, int y)
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{
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do_draw(canvas, width, height, img, 0, 0, img->w, img->h, x, y);
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return img->w;
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}
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int draw_char(void *canvas, int width, int height,
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const struct font *font, char c, int x, int y)
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{
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const char *cp;
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const struct sym *sym;
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if (c == ' ')
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return font->max_width;
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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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do_draw(canvas, width, height,
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font->img, sym->x, sym->y, sym->w, sym->h, x, y);
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return sym->w;
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}
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int char_height(const struct font *font, char c)
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{
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const char *cp;
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const struct sym *sym;
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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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return sym->h;
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}
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