2 * Hic Est Leo -- Text Symbolizer
4 * (c) 2014 Martin Mares <mj@ucw.cz>
8 #include <ucw/stkstring.h>
12 #include FT_FREETYPE_H
13 #include <pango/pangoft2.h>
29 PangoFontDescription *pango_font_desc;
33 #define HASH_NODE struct text_font
34 #define HASH_PREFIX(x) text_font_##x
35 #define HASH_KEY_ENDSTRING key
36 #define HASH_WANT_LOOKUP
37 #define HASH_LOOKUP_DETECT_NEW
38 #define HASH_USE_POOL sym_mp
39 #include <ucw/hashtable.h>
41 static PangoFontMap *pango_font_map;
42 static PangoContext *pango_context;
44 static double pt_to_mm(double pt)
46 return pt / 72 * 25.4;
49 static double mm_to_pt(double mm)
51 return mm / 25.4 * 72;
54 static double pango_to_mm(double pango)
56 return pt_to_mm(pango / PANGO_SCALE);
59 static double mm_to_pango(double mm)
61 return mm_to_pt(mm) * PANGO_SCALE;
65 * Pango tries to do pixel-based optimizations in low resolutions.
66 * Work around it by scaling everything up.
68 #define FONT_HACK_FACTOR 30
70 static struct text_font *font_get(struct text_font *req)
72 char *key = stk_printf("%s:%.6g:%u:%u", req->family, req->size, req->weight, req->style);
74 struct text_font *font = text_font_lookup(key, &is_new);
77 msg(L_DEBUG, "Loading font %s (size %.6g, weight %s, style %s)", req->family, req->size, osm_val_decode(req->weight), osm_val_decode(req->style));
78 font->family = mp_strdup(sym_mp, req->family);
79 font->size = req->size;
80 font->weight = req->weight;
81 font->style = req->style;
83 PangoFontDescription *desc;
84 desc = pango_font_description_new();
86 pango_font_description_set_family(desc, font->family);
87 if (font->weight != VALUE_NORMAL)
88 pango_font_description_set_weight(desc, PANGO_WEIGHT_BOLD);
89 if (font->style != VALUE_NORMAL)
90 pango_font_description_set_style(desc, PANGO_STYLE_ITALIC);
91 pango_font_description_set_size(desc, mm_to_pango(font->size));
92 font->pango_font_desc = desc;
96 PangoFont *pfont = pango_font_map_load_font(pango_font_map, pango_context, desc);
98 PangoFontDescription *d2 = pango_font_describe(pfont);
100 msg(L_DEBUG, "Font desc: %s", pango_font_description_to_string(d2));
102 PangoFontMetrics *fm = pango_font_get_metrics(pfont, NULL);
104 msg(L_DEBUG, "Font metrics: asc=%.6g desc=%.6g", pango_to_mm(pango_font_metrics_get_ascent(fm)), pango_to_mm(pango_font_metrics_get_descent(fm)));
110 static void font_init(void)
114 pango_font_map = pango_ft2_font_map_new();
115 ASSERT(pango_font_map);
116 pango_ft2_font_map_set_resolution((PangoFT2FontMap *) pango_font_map, 72 * FONT_HACK_FACTOR, 72 * FONT_HACK_FACTOR);
117 pango_context = pango_font_map_create_context(PANGO_FONT_MAP(pango_font_map));
118 ASSERT(pango_context);
121 static void text_size(struct sym_text *st)
123 PangoLayout *layout = pango_layout_new(pango_context);
124 pango_layout_set_font_description(layout, st->font->pango_font_desc);
125 pango_layout_set_text(layout, osm_val_decode(st->text), -1);
126 pango_layout_context_changed(layout);
129 pango_layout_get_extents(layout, NULL, &ext);
130 // st->tx = pango_to_mm(ext.x) / FONT_HACK_FACTOR;
131 // st->ty = pango_to_mm(ext.y) / FONT_HACK_FACTOR;
132 st->tw = pango_to_mm(ext.width) / FONT_HACK_FACTOR;
133 st->th = pango_to_mm(pango_layout_get_baseline(layout)) / FONT_HACK_FACTOR;
134 st->td = pango_to_mm(ext.height) / FONT_HACK_FACTOR - st->th;
136 g_object_unref(layout);
139 /*** Elimination of duplicate texts ***/
141 // FIXME: Get rid of globals
142 #define DUP_TILE_SIZE 10
143 static int dup_tiles_w, dup_tiles_h;
144 static struct sym_text **dup_tiles;
146 static void text_dup_init(void)
148 dup_tiles_w = 1 + page_map_width / DUP_TILE_SIZE;
149 dup_tiles_h = 1 + page_map_height / DUP_TILE_SIZE;
150 dup_tiles = xmalloc_zero(sizeof(struct sym_text *) * dup_tiles_w * dup_tiles_h);
151 msg(L_DEBUG, "Allocated text tiles: %u x %u", dup_tiles_w, dup_tiles_h);
154 static int text_dup_coord(int x, int y)
156 ASSERT(x >= 0 && x < dup_tiles_w && y >= 0 && y < dup_tiles_h);
157 return x + y * dup_tiles_w;
160 static double text_quad_dist(struct sym_text *a, struct sym_text *b)
162 double dx = a->x - b->x;
163 double dy = a->y - b->y;
164 return dx*dx + dy*dy;
167 static bool text_dup_detect(struct sym_text *t, struct style_info *si)
169 // Out-of-frame texts are dropped immediately
170 double x = t->x - page_offset_x;
171 double y = t->y - page_offset_y;
172 if (x < 0 || x >= page_map_width ||
173 y < 0 || y >= page_map_height)
176 int tile_x = x / DUP_TILE_SIZE;
177 int tile_y = y / DUP_TILE_SIZE;
180 style_get_number(si, PROP_TEXT_DUP_THRESHOLD, &radius);
183 // A rather simple-minded algorithm, but believed to be efficient enough.
184 int r_tiles = 1 + radius / DUP_TILE_SIZE;
185 int x_start = MAX(0, tile_x - r_tiles);
186 int x_stop = MIN(dup_tiles_w - 1, tile_x + r_tiles);
187 int y_start = MAX(0, tile_y - r_tiles);
188 int y_stop = MIN(dup_tiles_h - 1, tile_y + r_tiles);
189 for (int x = x_start; x <= x_stop; x++)
190 for (int y = y_start; y <= y_stop; y++)
192 for (struct sym_text *d = dup_tiles[text_dup_coord(x, y)]; d; d = d->next_in_tile)
193 if (d->text == t->text &&
194 text_quad_dist(d, t) <= radius*radius &&
195 d->text_color == t->text_color &&
198 t->next_duplicate = d->next_duplicate;
199 d->next_duplicate = t;
205 int tile_i = text_dup_coord(tile_x, tile_y);
206 t->next_in_tile = dup_tiles[tile_i];
207 dup_tiles[tile_i] = t;
211 /*** Core of the symbolizer ***/
213 static void prepare_text_element(struct sym_text *t, struct svg *svg)
215 struct text_font *font = t->font;
216 svg_push_element(svg, "text");
217 svg_set_attr_dimen(svg, "x", t->x);
218 svg_set_attr_dimen(svg, "y", t->y);
219 svg_set_attr(svg, "font-family", font->family);
220 svg_set_attr_dimen(svg, "font-size", font->size);
221 if (font->weight != VALUE_NORMAL)
222 svg_set_attr(svg, "font-weight", osm_val_decode(font->weight));
223 if (font->style != VALUE_NORMAL)
224 svg_set_attr(svg, "font-style", osm_val_decode(font->style));
227 static void sym_text_draw(struct symbol *sym, struct svg *svg)
229 struct sym_text *t = (struct sym_text *) sym;
230 printf("Drawing %s at [%.2f; %.2f]\n", osm_val_decode(t->text), t->x, t->y);
232 if (t->next_duplicate)
234 // If there is a cluster of duplicate texts, average their positions
235 double sx = 0, sy = 0;
237 for (struct sym_text *u = t; u; u = u->next_duplicate)
249 svg_push_element(svg, "g");
250 svg_set_attr_float(svg, "opacity", t->opacity);
255 prepare_text_element(t, svg);
256 svg_set_attr(svg, "fill", "none");
257 svg_set_attr_color(svg, "stroke", t->halo_color);
258 svg_set_attr_dimen(svg, "stroke-width", t->halo_radius);
259 svg_set_attr(svg, "stroke-linecap", "round");
260 svg_set_attr(svg, "stroke-linejoin", "round");
261 if (t->halo_opacity != 1)
262 svg_set_attr_float(svg, "stroke-opacity", t->halo_opacity);
263 svg_push_chars(svg)->name = osm_val_decode(t->text);
268 prepare_text_element(t, svg);
269 svg_set_attr_color(svg, "fill", t->text_color);
270 svg_set_attr(svg, "stroke", "none");
271 svg_push_chars(svg)->name = osm_val_decode(t->text);
276 // Draw bounding box for debugging
277 svg_push_element(svg, "rect");
278 svg_set_attr(svg, "fill", "none");
279 svg_set_attr_color(svg, "stroke", 0x0000ff);
280 svg_set_attr_dimen(svg, "stroke-width", 0.2);
281 svg_set_attr_dimen(svg, "x", t->x);
282 svg_set_attr_dimen(svg, "y", t->y - t->th);
283 svg_set_attr_dimen(svg, "width", t->tw);
284 svg_set_attr_dimen(svg, "height", t->th + t->td);
287 svg_push_element(svg, "line");
288 svg_set_attr(svg, "fill", "none");
289 svg_set_attr_color(svg, "stroke", 0x0000ff);
290 svg_set_attr_dimen(svg, "stroke-width", 0.2);
291 svg_set_attr_dimen(svg, "x1", t->x);
292 svg_set_attr_dimen(svg, "y1", t->y);
293 svg_set_attr_dimen(svg, "x2", t->x + t->tw);
294 svg_set_attr_dimen(svg, "y2", t->y);
302 static osm_val_t get_text(struct osm_object *o, struct style_info *si)
304 struct style_prop *prop = style_get_and_check(si, PROP_TEXT, (1 << PROP_TYPE_STRING) | (1 << PROP_TYPE_IDENT));
308 if (prop->type == PROP_TYPE_IDENT && prop->val.id == VALUE_AUTO)
310 static const osm_key_t auto_text_keys[] = {
311 KEY_NAME_CZ, // FIXME: This should be configurable
316 KEY_ADDR_HOUSENUMBER,
318 for (uns i=0; i < ARRAY_SIZE(auto_text_keys); i++)
320 osm_val_t val = osm_obj_find_tag(o, auto_text_keys[i]);
327 return osm_obj_find_tag(o, osm_key_encode(osm_val_decode(prop->val.id)));
330 static void get_text_attrs(struct sym_text *st, struct style_info *si)
332 struct osm_object *o = st->s.o;
333 if (o->type == OSM_TYPE_WAY && osm_way_cyclic_p((struct osm_way *) o))
334 st->text_color = 0xc0c0c0; // FIXME: This is an ugly hack, do we need it?
336 st->text_color = 0xffffff;
337 style_get_color(si, PROP_TEXT_COLOR, &st->text_color);
339 struct text_font f = {
340 .family = "Helvetica",
343 osm_val_t fam = style_get_string(si, PROP_FONT_FAMILY);
345 f.family = osm_val_decode(fam);
346 style_get_number(si, PROP_FONT_SIZE, &f.size);
347 f.weight = style_get_ident(si, PROP_FONT_WEIGHT);
349 f.weight = VALUE_NORMAL;
350 if (f.weight != VALUE_NORMAL && f.weight != VALUE_BOLD)
352 osm_obj_warn(o, "Unknown font-weight %s", osm_val_decode(f.weight));
353 f.weight = VALUE_NORMAL;
355 f.style = style_get_ident(si, PROP_FONT_STYLE);
357 f.style = VALUE_NORMAL;
358 if (f.style != VALUE_NORMAL && f.style != VALUE_ITALIC)
360 osm_obj_warn(o, "Unknown font-style %s", osm_val_decode(f.weight));
361 f.style = VALUE_NORMAL;
363 st->font = font_get(&f);
366 style_get_number(si, PROP_TEXT_OPACITY, &st->opacity);
368 st->halo_color = st->text_color ^ 0xffffff;
369 style_get_color(si, PROP_TEXT_HALO_COLOR, &st->halo_color);
371 style_get_number(si, PROP_TEXT_HALO_RADIUS, &st->halo_radius);
372 st->halo_opacity = 1;
373 style_get_number(si, PROP_TEXT_HALO_OPACITY, &st->halo_opacity);
375 double dx = 0, dy = 0;
376 style_get_number(si, PROP_TEXT_OFFSET_X, &dx);
377 style_get_number(si, PROP_TEXT_OFFSET_Y, &dy);
378 style_get_number(si, PROP_TEXT_OFFSET, &dy);
383 static void text_fix_placement(struct sym_text *st)
385 // Fix texts which do not fit on the paper
386 st->x = MIN(st->x, page_offset_x + page_map_width - st->tw);
387 st->x = MAX(st->x, page_offset_x);
388 st->y = MIN(st->y, page_offset_y + page_map_height - st->th);
389 st->y = MAX(st->y, page_offset_y + st->td);
392 static void sym_text_node(struct osm_object *o, struct style_info *si, osm_val_t text)
394 struct osm_node *n = (struct osm_node *) o;
396 struct sym_text *st = sym_text_new(o);
401 get_text_attrs(st, si);
404 osm_val_t ah = style_get_ident(si, PROP_TEXT_ANCHOR_HORIZONTAL);
417 osm_obj_warn(o, "Unknown text-anchor-horizontal: %s", osm_val_decode(ah));
420 osm_val_t av = style_get_ident(si, PROP_TEXT_ANCHOR_VERTICAL);
423 case VALUE_ABOVE: // FIXME: What's the difference between above and top?
428 st->y -= (st->th + st->td) / 2;
436 osm_obj_warn(o, "Unknown text-anchor-vertical: %s", osm_val_decode(av));
439 text_fix_placement(st);
440 if (!text_dup_detect(st, si))
442 msg(L_DEBUG, "Text <%s> dropped as duplicate", osm_val_decode(text));
446 //sym_plan(&st->s, sym_zindex(o, si, 5));
449 static void sym_text_center(struct osm_object *o, struct style_info *si, osm_val_t text, double x, double y)
451 struct sym_text *st = sym_text_new(o);
456 get_text_attrs(st, si);
459 st->y += st->th - (st->th + st->td) / 2;
460 text_fix_placement(st);
461 if (o->type == OSM_TYPE_WAY && !osm_way_cyclic_p((struct osm_way *) o))
463 //sym_plan(&st->s, sym_zindex(o, si, 4.9));
464 printf("[Sym] Labelling way %ju with %s\n", o->id, osm_val_decode(st->text));
465 labeller_add_linelabel(&st->s, o, sym_zindex(o, si, 4.9));
469 //sym_plan(&st->s, sym_zindex(o, si, 4.9));
470 printf("[Sym] Labelling area %ju with %s\n", o->id, osm_val_decode(st->text));
471 labeller_add_arealabel(&st->s, o, sym_zindex(o, si, 4.9));
475 static void sym_text_way(struct osm_object *o, struct style_info *si, osm_val_t text)
478 osm_val_t tp = style_get_ident(si, PROP_TEXT_POSITION);
483 if (osm_obj_center(o, &x, &y))
484 sym_text_center(o, si, text, x, y);
489 osm_obj_warn(o, "Unknown text-position: %s", osm_val_decode(tp));
493 static void sym_text_mpg(struct osm_object *o, struct style_info *si, osm_val_t text)
496 osm_val_t tp = style_get_ident(si, PROP_TEXT_POSITION);
501 if (osm_obj_center(o, &x, &y))
502 sym_text_center(o, si, text, x, y);
507 osm_obj_warn(o, "Unknown text-position: %s", osm_val_decode(tp));
511 static void sym_text_gen(struct osm_object *o, struct style_info *si, struct svg *svg UNUSED)
513 osm_val_t text = get_text(o, si);
520 sym_text_node(o, si, text);
523 sym_text_way(o, si, text);
525 case OSM_TYPE_MULTIPOLYGON:
526 sym_text_mpg(o, si, text);
529 osm_obj_warn(o, "Text symbolizer does not support this object type");
534 static void sym_text_init(void)
540 struct symbolizer symbolizer_text = {
542 .draw = sym_text_draw,
544 .init = sym_text_init,
547 struct sym_text *sym_text_new(struct osm_object *o)
549 return sym_new(SYMBOLIZER_TEXT, o, sizeof(struct sym_text));
553 void scale_text(struct svg *svg, double x, double y, osm_val_t text)
555 struct sym_text *st = sym_text_new(NULL);
557 struct text_font f = {
559 .weight = VALUE_NORMAL,
560 .style = VALUE_NORMAL,
561 .size = pt_to_mm(10),
568 st->font = font_get(&f);
570 st->halo_color = 0xffffff;
571 st->halo_radius = 0.8;
572 st->halo_opacity = 1;
575 sym_text_draw(&st->s, svg);