gemini - kennedy.gemi.dev

0 /* See LICENSE file for copyright and license details. */

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <string.h>

4 #include <X11/Xlib.h>

5 #include <X11/Xft/Xft.h>

7 #include "drw.h"

8 #include "util.h"

10 #define UTF_INVALID 0xFFFD

11 #define UTF_SIZ 4

13 static const unsigned char utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};

14 static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};

15 static const long utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};

16 static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};

18 static long

19 utf8decodebyte(const char c, size_t *i)

20 {

21 for (*i = 0; *i < (UTF_SIZ + 1); ++(*i))

22 if (((unsigned char)c & utfmask[*i]) == utfbyte[*i])

23 return (unsigned char)c & ~utfmask[*i];

24 return 0;

25 }

27 static size_t

28 utf8validate(long *u, size_t i)

29 {

30 if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))

31 *u = UTF_INVALID;

32 for (i = 1; *u > utfmax[i]; ++i)

33 ;

34 return i;

35 }

37 static size_t

38 utf8decode(const char *c, long *u, size_t clen)

39 {

40 size_t i, j, len, type;

41 long udecoded;

43 *u = UTF_INVALID;

44 if (!clen)

45 return 0;

46 udecoded = utf8decodebyte(c[0], &len);

47 if (!BETWEEN(len, 1, UTF_SIZ))

48 return 1;

49 for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {

50 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);

51 if (type)

52 return j;

53 }

54 if (j < len)

55 return 0;

56 *u = udecoded;

57 utf8validate(u, len);

59 return len;

60 }

62 Drw *

63 drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h)

64 {

65 Drw *drw = ecalloc(1, sizeof(Drw));

67 drw->dpy = dpy;

68 drw->screen = screen;

69 drw->root = root;

70 drw->w = w;

71 drw->h = h;

72 drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));

73 drw->gc = XCreateGC(dpy, root, 0, NULL);

74 XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);

76 return drw;

77 }

79 void

80 drw_resize(Drw *drw, unsigned int w, unsigned int h)

81 {

82 if (!drw)

83 return;

85 drw->w = w;

86 drw->h = h;

87 if (drw->drawable)

88 XFreePixmap(drw->dpy, drw->drawable);

89 drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));

90 }

92 void

93 drw_free(Drw *drw)

94 {

95 XFreePixmap(drw->dpy, drw->drawable);

96 XFreeGC(drw->dpy, drw->gc);

97 drw_fontset_free(drw->fonts);

98 free(drw);

99 }

100

101 /* This function is an implementation detail. Library users should use

102 * drw_fontset_create instead.

103 */

104 static Fnt *

105 xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)

106 {

107 Fnt *font;

108 XftFont *xfont = NULL;

109 FcPattern *pattern = NULL;

110

111 if (fontname) {

112 /* Using the pattern found at font->xfont->pattern does not yield the

113 * same substitution results as using the pattern returned by

114 * FcNameParse; using the latter results in the desired fallback

115 * behaviour whereas the former just results in missing-character

116 * rectangles being drawn, at least with some fonts. */

117 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {

118 fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);

119 return NULL;

120 }

121 if (!(pattern = FcNameParse((FcChar8 *) fontname))) {

122 fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);

123 XftFontClose(drw->dpy, xfont);

124 return NULL;

125 }

126 } else if (fontpattern) {

127 if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {

128 fprintf(stderr, "error, cannot load font from pattern.\n");

129 return NULL;

130 }

131 } else {

132 die("no font specified.");

133 }

134

135 font = ecalloc(1, sizeof(Fnt));

136 font->xfont = xfont;

137 font->pattern = pattern;

138 font->h = xfont->ascent + xfont->descent;

139 font->dpy = drw->dpy;

140

141 return font;

142 }

143

144 static void

145 xfont_free(Fnt *font)

146 {

147 if (!font)

148 return;

149 if (font->pattern)

150 FcPatternDestroy(font->pattern);

151 XftFontClose(font->dpy, font->xfont);

152 free(font);

153 }

154

155 Fnt*

156 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)

157 {

158 Fnt *cur, *ret = NULL;

159 size_t i;

160

161 if (!drw || !fonts)

162 return NULL;

163

164 for (i = 1; i <= fontcount; i++) {

165 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {

166 cur->next = ret;

167 ret = cur;

168 }

169 }

170 return (drw->fonts = ret);

171 }

172

173 void

174 drw_fontset_free(Fnt *font)

175 {

176 if (font) {

177 drw_fontset_free(font->next);

178 xfont_free(font);

179 }

180 }

181

182 void

183 drw_clr_create(Drw *drw, Clr *dest, const char *clrname)

184 {

185 if (!drw || !dest || !clrname)

186 return;

187

188 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),

189 DefaultColormap(drw->dpy, drw->screen),

190 clrname, dest))

191 die("error, cannot allocate color '%s'", clrname);

192

193 dest->pixel |= 0xff << 24;

194 }

195

196 /* Wrapper to create color schemes. The caller has to call free(3) on the

197 * returned color scheme when done using it. */

198 Clr *

199 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)

200 {

201 size_t i;

202 Clr *ret;

203

204 /* need at least two colors for a scheme */

205 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))

206 return NULL;

207

208 for (i = 0; i < clrcount; i++)

209 drw_clr_create(drw, &ret[i], clrnames[i]);

210 return ret;

211 }

212

213 void

214 drw_setfontset(Drw *drw, Fnt *set)

215 {

216 if (drw)

217 drw->fonts = set;

218 }

219

220 void

221 drw_setscheme(Drw *drw, Clr *scm)

222 {

223 if (drw)

224 drw->scheme = scm;

225 }

226

227 void

228 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)

229 {

230 if (!drw || !drw->scheme)

231 return;

232 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);

233 if (filled)

234 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);

235 else

236 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);

237 }

238

239 int

240 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)

241 {

242 int i, ty, ellipsis_x = 0;

243 unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len;

244 XftDraw *d = NULL;

245 Fnt *usedfont, *curfont, *nextfont;

246 int utf8strlen, utf8charlen, render = x || y || w || h;

247 long utf8codepoint = 0;

248 const char *utf8str;

249 FcCharSet *fccharset;

250 FcPattern *fcpattern;

251 FcPattern *match;

252 XftResult result;

253 int charexists = 0, overflow = 0;

254 /* keep track of a couple codepoints for which we have no match. */

255 enum { nomatches_len = 64 };

256 static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches;

257 static unsigned int ellipsis_width = 0;

258

259 if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)

260 return 0;

261

262 if (!render) {

263 w = invert ? invert : ~invert;

264 } else {

265 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);

266 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);

267 d = XftDrawCreate(drw->dpy, drw->drawable,

268 DefaultVisual(drw->dpy, drw->screen),

269 DefaultColormap(drw->dpy, drw->screen));

270 x += lpad;

271 w -= lpad;

272 }

273

274 usedfont = drw->fonts;

275 if (!ellipsis_width && render)

276 ellipsis_width = drw_fontset_getwidth(drw, "...");

277 while (1) {

278 ew = ellipsis_len = utf8strlen = 0;

279 utf8str = text;

280 nextfont = NULL;

281 while (*text) {

282 utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);

283 for (curfont = drw->fonts; curfont; curfont = curfont->next) {

284 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);

285 if (charexists) {

286 drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);

287 if (ew + ellipsis_width <= w) {

288 /* keep track where the ellipsis still fits */

289 ellipsis_x = x + ew;

290 ellipsis_w = w - ew;

291 ellipsis_len = utf8strlen;

292 }

293

294 if (ew + tmpw > w) {

295 overflow = 1;

296 /* called from drw_fontset_getwidth_clamp():

297 * it wants the width AFTER the overflow

298 */

299 if (!render)

300 x += tmpw;

301 else

302 utf8strlen = ellipsis_len;

303 } else if (curfont == usedfont) {

304 utf8strlen += utf8charlen;

305 text += utf8charlen;

306 ew += tmpw;

307 } else {

308 nextfont = curfont;

309 }

310 break;

311 }

312 }

313

314 if (overflow || !charexists || nextfont)

315 break;

316 else

317 charexists = 0;

318 }

319

320 if (utf8strlen) {

321 if (render) {

322 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;

323 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],

324 usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);

325 }

326 x += ew;

327 w -= ew;

328 }

329 if (render && overflow)

330 drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);

331

332 if (!*text || overflow) {

333 break;

334 } else if (nextfont) {

335 charexists = 0;

336 usedfont = nextfont;

337 } else {

338 /* Regardless of whether or not a fallback font is found, the

339 * character must be drawn. */

340 charexists = 1;

341

342 for (i = 0; i < nomatches_len; ++i) {

343 /* avoid calling XftFontMatch if we know we won't find a match */

344 if (utf8codepoint == nomatches.codepoint[i])

345 goto no_match;

346 }

347

348 fccharset = FcCharSetCreate();

349 FcCharSetAddChar(fccharset, utf8codepoint);

350

351 if (!drw->fonts->pattern) {

352 /* Refer to the comment in xfont_create for more information. */

353 die("the first font in the cache must be loaded from a font string.");

354 }

355

356 fcpattern = FcPatternDuplicate(drw->fonts->pattern);

357 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);

358 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);

359

360 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);

361 FcDefaultSubstitute(fcpattern);

362 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);

363

364 FcCharSetDestroy(fccharset);

365 FcPatternDestroy(fcpattern);

366

367 if (match) {

368 usedfont = xfont_create(drw, NULL, match);

369 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {

370 for (curfont = drw->fonts; curfont->next; curfont = curfont->next)

371 ; /* NOP */

372 curfont->next = usedfont;

373 } else {

374 xfont_free(usedfont);

375 nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint;

376 no_match:

377 usedfont = drw->fonts;

378 }

379 }

380 }

381 }

382 if (d)

383 XftDrawDestroy(d);

384

385 return x + (render ? w : 0);

386 }

387

388 void

389 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)

390 {

391 if (!drw)

392 return;

393

394 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);

395 XSync(drw->dpy, False);

396 }

397

398 unsigned int

399 drw_fontset_getwidth(Drw *drw, const char *text)

400 {

401 if (!drw || !drw->fonts || !text)

402 return 0;

403 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);

404 }

405

406 unsigned int

407 drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n)

408 {

409 unsigned int tmp = 0;

410 if (drw && drw->fonts && text && n)

411 tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);

412 return MIN(n, tmp);

413 }

414

415 void

416 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)

417 {

418 XGlyphInfo ext;

419

420 if (!font || !text)

421 return;

422

423 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);

424 if (w)

425 *w = ext.xOff;

426 if (h)

427 *h = font->h;

428 }

429

430 Cur *

431 drw_cur_create(Drw *drw, int shape)

432 {

433 Cur *cur;

434

435 if (!drw || !(cur = ecalloc(1, sizeof(Cur))))

436 return NULL;

437

438 cur->cursor = XCreateFontCursor(drw->dpy, shape);

439

440 return cur;

441 }

442

443 void

444 drw_cur_free(Drw *drw, Cur *cursor)

445 {

446 if (!cursor)

447 return;

448

449 XFreeCursor(drw->dpy, cursor->cursor);

450 free(cursor);

451 }

452