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tools/libtxt/: restructure to make more modular and avoid global variables
This commit is contained in:
Werner Almesberger
parent
1b692d0961
commit
d05c6a9558
@ -33,15 +33,19 @@ struct sym {
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int w, h;
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};
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struct font {
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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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struct sym sym[CHARS];
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uint8_t *data;
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};
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struct font {
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const struct image *img;
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struct sym sym[CHARS];
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};
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static struct font font;
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/* ----- Helper functions -------------------------------------------------- */
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static const char *alloc_sprintf(const char *fmt, ...)
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@ -63,23 +67,25 @@ static const char *alloc_sprintf(const char *fmt, ...)
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}
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static const char *read_font_file(FILE *file)
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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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free(font.data);
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font.data = NULL;
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img->data = NULL;
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n = fscanf(file, "#define %*[^_]_width %d\n", &font.w);
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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", &font.h);
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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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@ -98,10 +104,10 @@ static const char *read_font_file(FILE *file)
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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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img->data = realloc(img->data, bytes);
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if (!img->data)
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abort();
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font.data[bytes-1] = v;
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img->data[bytes-1] = v;
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if (c == ',')
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continue;
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@ -109,60 +115,100 @@ static const char *read_font_file(FILE *file)
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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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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, font.h, font.w);
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bytes, img->h, img->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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struct image *load_image(const char *name, const char **error)
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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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FILE *file;
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struct image *img;
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const char *err;
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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 = malloc(sizeof(struct image));
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if (!img)
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abort();
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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(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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void free_image(struct image *img)
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{
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free(img->data);
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free(img);
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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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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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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 != font.w; x++) {
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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 (font.data[y*font.span+(x >> 3)] & (1 << (x & 7)))
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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(n, last, x, y0, y1);
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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(n, last, x, y0, y1);
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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(void)
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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 != 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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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 != font.span)
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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(&n, last+1, y-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(&n, last+1, y-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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@ -170,25 +216,39 @@ static const char *analyze_font(void)
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}
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const char *load_font(const char *name)
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struct font *make_font(const struct image *img, const char **error)
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{
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FILE *file;
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const char *error;
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struct font *font;
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const char *err;
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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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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);
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return NULL;
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}
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return 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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void free_font(struct font *font)
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{
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free(font);
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}
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/* ----- Drawing on a canvas ----------------------------------------------- */
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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 struct image *img = font->img;
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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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@ -197,7 +257,7 @@ int draw_char(void *canvas, int width, int height, char c, int x, int y)
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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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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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@ -206,7 +266,7 @@ int draw_char(void *canvas, int width, int height, char c, int x, int y)
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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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if (img->data[(sym->y+iy)*img->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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@ -217,25 +277,36 @@ int draw_char(void *canvas, int width, int height, char c, int x, int y)
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}
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/* ----- Testing ----------------------------------------------------------- */
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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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struct font *font;
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const struct image *img;
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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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img = load_image(argv[1], &error);
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if (!img) {
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fprintf(stderr, "%s\n", error);
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return 1;
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}
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font = make_font(img, &error);
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if (!font) {
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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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xo = draw_char(canvas, W, H, font, *s, x, 0);
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if (xo)
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x += xo+1;
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}
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@ -13,6 +13,7 @@
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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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@ -40,11 +41,17 @@ struct edit {
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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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* Newline leaves one blank row between text lines.
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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 image *load_image(const char *name, const char **error);
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void free_image(struct image *img);
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struct font *make_font(const struct image *img, const char **error);
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void free_font(struct font *font);
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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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struct edit *text2edit(const char *s);
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char *edit2text(const struct edit *e);
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