| 1 | /* ftxfont.c -- FreeType font driver on X (without using XFT). |
| 2 | Copyright (C) 2006-2014 Free Software Foundation, Inc. |
| 3 | Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 |
| 4 | National Institute of Advanced Industrial Science and Technology (AIST) |
| 5 | Registration Number H13PRO009 |
| 6 | |
| 7 | This file is part of GNU Emacs. |
| 8 | |
| 9 | GNU Emacs is free software: you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation, either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | GNU Emacs is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include <config.h> |
| 23 | #include <stdio.h> |
| 24 | #include <X11/Xlib.h> |
| 25 | |
| 26 | #include "lisp.h" |
| 27 | #include "dispextern.h" |
| 28 | #include "xterm.h" |
| 29 | #include "frame.h" |
| 30 | #include "blockinput.h" |
| 31 | #include "character.h" |
| 32 | #include "charset.h" |
| 33 | #include "fontset.h" |
| 34 | #include "font.h" |
| 35 | |
| 36 | /* FTX font driver. */ |
| 37 | |
| 38 | static Lisp_Object Qftx; |
| 39 | |
| 40 | struct font_driver ftxfont_driver; |
| 41 | |
| 42 | struct ftxfont_frame_data |
| 43 | { |
| 44 | /* Background and foreground colors. */ |
| 45 | XColor colors[2]; |
| 46 | /* GCs interpolating the above colors. gcs[0] is for a color |
| 47 | closest to BACKGROUND, and gcs[5] is for a color closest to |
| 48 | FOREGROUND. */ |
| 49 | GC gcs[6]; |
| 50 | struct ftxfont_frame_data *next; |
| 51 | }; |
| 52 | |
| 53 | |
| 54 | /* Return an array of 6 GCs for antialiasing. */ |
| 55 | |
| 56 | static GC * |
| 57 | ftxfont_get_gcs (struct frame *f, unsigned long foreground, unsigned long background) |
| 58 | { |
| 59 | XColor color; |
| 60 | XGCValues xgcv; |
| 61 | int i; |
| 62 | struct ftxfont_frame_data *data = font_get_frame_data (f, &ftxfont_driver); |
| 63 | struct ftxfont_frame_data *prev = NULL, *this = NULL, *new; |
| 64 | |
| 65 | if (data) |
| 66 | { |
| 67 | for (this = data; this; prev = this, this = this->next) |
| 68 | { |
| 69 | if (this->colors[0].pixel < background) |
| 70 | continue; |
| 71 | if (this->colors[0].pixel > background) |
| 72 | break; |
| 73 | if (this->colors[1].pixel < foreground) |
| 74 | continue; |
| 75 | if (this->colors[1].pixel > foreground) |
| 76 | break; |
| 77 | return this->gcs; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | new = xmalloc_unsafe (sizeof *new); |
| 82 | if (! new) |
| 83 | return NULL; |
| 84 | new->next = this; |
| 85 | if (prev) |
| 86 | { |
| 87 | prev->next = new; |
| 88 | } |
| 89 | else if (font_put_frame_data (f, &ftxfont_driver, new) < 0) |
| 90 | { |
| 91 | xfree (new); |
| 92 | return NULL; |
| 93 | } |
| 94 | |
| 95 | new->colors[0].pixel = background; |
| 96 | new->colors[1].pixel = foreground; |
| 97 | |
| 98 | block_input (); |
| 99 | XQueryColors (FRAME_X_DISPLAY (f), FRAME_X_COLORMAP (f), new->colors, 2); |
| 100 | for (i = 1; i < 7; i++) |
| 101 | { |
| 102 | /* Interpolate colors linearly. Any better algorithm? */ |
| 103 | color.red |
| 104 | = (new->colors[1].red * i + new->colors[0].red * (8 - i)) / 8; |
| 105 | color.green |
| 106 | = (new->colors[1].green * i + new->colors[0].green * (8 - i)) / 8; |
| 107 | color.blue |
| 108 | = (new->colors[1].blue * i + new->colors[0].blue * (8 - i)) / 8; |
| 109 | if (! x_alloc_nearest_color (f, FRAME_X_COLORMAP (f), &color)) |
| 110 | break; |
| 111 | xgcv.foreground = color.pixel; |
| 112 | new->gcs[i - 1] = XCreateGC (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), |
| 113 | GCForeground, &xgcv); |
| 114 | } |
| 115 | unblock_input (); |
| 116 | |
| 117 | if (i < 7) |
| 118 | { |
| 119 | block_input (); |
| 120 | for (i--; i >= 0; i--) |
| 121 | XFreeGC (FRAME_X_DISPLAY (f), new->gcs[i]); |
| 122 | unblock_input (); |
| 123 | if (prev) |
| 124 | prev->next = new->next; |
| 125 | else if (data) |
| 126 | font_put_frame_data (f, &ftxfont_driver, new->next); |
| 127 | xfree (new); |
| 128 | return NULL; |
| 129 | } |
| 130 | return new->gcs; |
| 131 | } |
| 132 | |
| 133 | static int |
| 134 | ftxfont_draw_bitmap (struct frame *f, GC gc_fore, GC *gcs, struct font *font, |
| 135 | unsigned int code, int x, int y, XPoint *p, int size, |
| 136 | int *n, bool flush) |
| 137 | { |
| 138 | struct font_bitmap bitmap; |
| 139 | unsigned char *b; |
| 140 | int i, j; |
| 141 | |
| 142 | if (ftfont_driver.get_bitmap (font, code, &bitmap, size > 0x100 ? 1 : 8) < 0) |
| 143 | return 0; |
| 144 | if (size > 0x100) |
| 145 | { |
| 146 | for (i = 0, b = bitmap.buffer; i < bitmap.rows; |
| 147 | i++, b += bitmap.pitch) |
| 148 | { |
| 149 | for (j = 0; j < bitmap.width; j++) |
| 150 | if (b[j / 8] & (1 << (7 - (j % 8)))) |
| 151 | { |
| 152 | p[n[0]].x = x + bitmap.left + j; |
| 153 | p[n[0]].y = y - bitmap.top + i; |
| 154 | if (++n[0] == size) |
| 155 | { |
| 156 | XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), |
| 157 | gc_fore, p, size, CoordModeOrigin); |
| 158 | n[0] = 0; |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | if (flush && n[0] > 0) |
| 163 | XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), |
| 164 | gc_fore, p, n[0], CoordModeOrigin); |
| 165 | } |
| 166 | else |
| 167 | { |
| 168 | for (i = 0, b = bitmap.buffer; i < bitmap.rows; |
| 169 | i++, b += bitmap.pitch) |
| 170 | { |
| 171 | for (j = 0; j < bitmap.width; j++) |
| 172 | { |
| 173 | int idx = (bitmap.bits_per_pixel == 1 |
| 174 | ? ((b[j / 8] & (1 << (7 - (j % 8)))) ? 6 : -1) |
| 175 | : (b[j] >> 5) - 1); |
| 176 | |
| 177 | if (idx >= 0) |
| 178 | { |
| 179 | XPoint *pp = p + size * idx; |
| 180 | |
| 181 | pp[n[idx]].x = x + bitmap.left + j; |
| 182 | pp[n[idx]].y = y - bitmap.top + i; |
| 183 | if (++(n[idx]) == size) |
| 184 | { |
| 185 | XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), |
| 186 | idx == 6 ? gc_fore : gcs[idx], pp, size, |
| 187 | CoordModeOrigin); |
| 188 | n[idx] = 0; |
| 189 | } |
| 190 | } |
| 191 | } |
| 192 | } |
| 193 | if (flush) |
| 194 | { |
| 195 | for (i = 0; i < 6; i++) |
| 196 | if (n[i] > 0) |
| 197 | XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), |
| 198 | gcs[i], p + 0x100 * i, n[i], CoordModeOrigin); |
| 199 | if (n[6] > 0) |
| 200 | XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), |
| 201 | gc_fore, p + 0x600, n[6], CoordModeOrigin); |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | if (ftfont_driver.free_bitmap) |
| 206 | ftfont_driver.free_bitmap (font, &bitmap); |
| 207 | |
| 208 | return bitmap.advance; |
| 209 | } |
| 210 | |
| 211 | static void |
| 212 | ftxfont_draw_background (struct frame *f, struct font *font, GC gc, int x, int y, |
| 213 | int width) |
| 214 | { |
| 215 | XGCValues xgcv; |
| 216 | |
| 217 | XGetGCValues (FRAME_X_DISPLAY (f), gc, |
| 218 | GCForeground | GCBackground, &xgcv); |
| 219 | XSetForeground (FRAME_X_DISPLAY (f), gc, xgcv.background); |
| 220 | XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc, |
| 221 | x, y - FONT_BASE (font), width, FONT_HEIGHT (font)); |
| 222 | XSetForeground (FRAME_X_DISPLAY (f), gc, xgcv.foreground); |
| 223 | } |
| 224 | |
| 225 | static Lisp_Object |
| 226 | ftxfont_list (struct frame *f, Lisp_Object spec) |
| 227 | { |
| 228 | Lisp_Object list = ftfont_driver.list (f, spec), tail; |
| 229 | |
| 230 | for (tail = list; CONSP (tail); tail = XCDR (tail)) |
| 231 | ASET (XCAR (tail), FONT_TYPE_INDEX, Qftx); |
| 232 | return list; |
| 233 | } |
| 234 | |
| 235 | static Lisp_Object |
| 236 | ftxfont_match (struct frame *f, Lisp_Object spec) |
| 237 | { |
| 238 | Lisp_Object entity = ftfont_driver.match (f, spec); |
| 239 | |
| 240 | if (VECTORP (entity)) |
| 241 | ASET (entity, FONT_TYPE_INDEX, Qftx); |
| 242 | return entity; |
| 243 | } |
| 244 | |
| 245 | static Lisp_Object |
| 246 | ftxfont_open (struct frame *f, Lisp_Object entity, int pixel_size) |
| 247 | { |
| 248 | Lisp_Object font_object; |
| 249 | struct font *font; |
| 250 | |
| 251 | font_object = ftfont_driver.open (f, entity, pixel_size); |
| 252 | if (NILP (font_object)) |
| 253 | return Qnil; |
| 254 | font = XFONT_OBJECT (font_object); |
| 255 | font->driver = &ftxfont_driver; |
| 256 | return font_object; |
| 257 | } |
| 258 | |
| 259 | static void |
| 260 | ftxfont_close (struct font *font) |
| 261 | { |
| 262 | ftfont_driver.close (font); |
| 263 | } |
| 264 | |
| 265 | static int |
| 266 | ftxfont_draw (struct glyph_string *s, int from, int to, int x, int y, |
| 267 | bool with_background) |
| 268 | { |
| 269 | struct frame *f = s->f; |
| 270 | struct face *face = s->face; |
| 271 | struct font *font = s->font; |
| 272 | XPoint p[0x700]; |
| 273 | int n[7]; |
| 274 | unsigned *code; |
| 275 | int len = to - from; |
| 276 | int i; |
| 277 | GC *gcs; |
| 278 | int xadvance; |
| 279 | |
| 280 | n[0] = n[1] = n[2] = n[3] = n[4] = n[5] = n[6] = 0; |
| 281 | |
| 282 | block_input (); |
| 283 | if (with_background) |
| 284 | ftxfont_draw_background (f, font, s->gc, x, y, s->width); |
| 285 | code = alloca (sizeof (unsigned) * len); |
| 286 | for (i = 0; i < len; i++) |
| 287 | code[i] = ((XCHAR2B_BYTE1 (s->char2b + from + i) << 8) |
| 288 | | XCHAR2B_BYTE2 (s->char2b + from + i)); |
| 289 | |
| 290 | if (face->gc == s->gc) |
| 291 | { |
| 292 | gcs = ftxfont_get_gcs (f, face->foreground, face->background); |
| 293 | } |
| 294 | else |
| 295 | { |
| 296 | XGCValues xgcv; |
| 297 | unsigned long mask = GCForeground | GCBackground; |
| 298 | |
| 299 | XGetGCValues (FRAME_X_DISPLAY (f), s->gc, mask, &xgcv); |
| 300 | gcs = ftxfont_get_gcs (f, xgcv.foreground, xgcv.background); |
| 301 | } |
| 302 | |
| 303 | if (gcs) |
| 304 | { |
| 305 | if (s->num_clips) |
| 306 | for (i = 0; i < 6; i++) |
| 307 | XSetClipRectangles (FRAME_X_DISPLAY (f), gcs[i], 0, 0, |
| 308 | s->clip, s->num_clips, Unsorted); |
| 309 | |
| 310 | for (i = 0; i < len; i++) |
| 311 | { |
| 312 | xadvance = ftxfont_draw_bitmap (f, s->gc, gcs, font, code[i], x, y, |
| 313 | p, 0x100, n, i + 1 == len); |
| 314 | x += (s->padding_p ? 1 : xadvance); |
| 315 | } |
| 316 | if (s->num_clips) |
| 317 | for (i = 0; i < 6; i++) |
| 318 | XSetClipMask (FRAME_X_DISPLAY (f), gcs[i], None); |
| 319 | } |
| 320 | else |
| 321 | { |
| 322 | /* We can't draw with antialiasing. |
| 323 | s->gc should already have a proper clipping setting. */ |
| 324 | for (i = 0; i < len; i++) |
| 325 | { |
| 326 | xadvance = ftxfont_draw_bitmap (f, s->gc, NULL, font, code[i], x, y, |
| 327 | p, 0x700, n, i + 1 == len); |
| 328 | x += (s->padding_p ? 1 : xadvance); |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | unblock_input (); |
| 333 | |
| 334 | return len; |
| 335 | } |
| 336 | |
| 337 | static int |
| 338 | ftxfont_end_for_frame (struct frame *f) |
| 339 | { |
| 340 | struct ftxfont_frame_data *data = font_get_frame_data (f, &ftxfont_driver); |
| 341 | |
| 342 | block_input (); |
| 343 | while (data) |
| 344 | { |
| 345 | struct ftxfont_frame_data *next = data->next; |
| 346 | int i; |
| 347 | |
| 348 | for (i = 0; i < 6; i++) |
| 349 | XFreeGC (FRAME_X_DISPLAY (f), data->gcs[i]); |
| 350 | xfree (data); |
| 351 | data = next; |
| 352 | } |
| 353 | unblock_input (); |
| 354 | font_put_frame_data (f, &ftxfont_driver, NULL); |
| 355 | return 0; |
| 356 | } |
| 357 | |
| 358 | \f |
| 359 | |
| 360 | void |
| 361 | syms_of_ftxfont (void) |
| 362 | { |
| 363 | DEFSYM (Qftx, "ftx"); |
| 364 | |
| 365 | ftxfont_driver = ftfont_driver; |
| 366 | ftxfont_driver.type = Qftx; |
| 367 | ftxfont_driver.list = ftxfont_list; |
| 368 | ftxfont_driver.match = ftxfont_match; |
| 369 | ftxfont_driver.open = ftxfont_open; |
| 370 | ftxfont_driver.close = ftxfont_close; |
| 371 | ftxfont_driver.draw = ftxfont_draw; |
| 372 | ftxfont_driver.end_for_frame = ftxfont_end_for_frame; |
| 373 | register_font_driver (&ftxfont_driver, NULL); |
| 374 | } |