1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
|
/* ftxfont.c -- FreeType font driver on X (without using XFT).
Copyright (C) 2006-2017 Free Software Foundation, Inc.
Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011
National Institute of Advanced Industrial Science and Technology (AIST)
Registration Number H13PRO009
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdio.h>
#include <X11/Xlib.h>
#include "lisp.h"
#include "xterm.h"
#include "frame.h"
#include "blockinput.h"
#include "font.h"
/* FTX font driver. */
struct ftxfont_frame_data
{
/* Background and foreground colors. */
XColor colors[2];
/* GCs interpolating the above colors. gcs[0] is for a color
closest to BACKGROUND, and gcs[5] is for a color closest to
FOREGROUND. */
GC gcs[6];
struct ftxfont_frame_data *next;
};
/* Return an array of 6 GCs for antialiasing. */
static GC *
ftxfont_get_gcs (struct frame *f, unsigned long foreground, unsigned long background)
{
XColor color;
XGCValues xgcv;
int i;
struct ftxfont_frame_data *data = font_get_frame_data (f, Qftx);
struct ftxfont_frame_data *prev = NULL, *this = NULL, *new;
if (data)
{
for (this = data; this; prev = this, this = this->next)
{
if (this->colors[0].pixel < background)
continue;
if (this->colors[0].pixel > background)
break;
if (this->colors[1].pixel < foreground)
continue;
if (this->colors[1].pixel > foreground)
break;
return this->gcs;
}
}
new = xmalloc (sizeof *new);
new->next = this;
if (prev)
prev->next = new;
font_put_frame_data (f, Qftx, new);
new->colors[0].pixel = background;
new->colors[1].pixel = foreground;
block_input ();
XQueryColors (FRAME_X_DISPLAY (f), FRAME_X_COLORMAP (f), new->colors, 2);
for (i = 1; i < 7; i++)
{
/* Interpolate colors linearly. Any better algorithm? */
color.red
= (new->colors[1].red * i + new->colors[0].red * (8 - i)) / 8;
color.green
= (new->colors[1].green * i + new->colors[0].green * (8 - i)) / 8;
color.blue
= (new->colors[1].blue * i + new->colors[0].blue * (8 - i)) / 8;
if (! x_alloc_nearest_color (f, FRAME_X_COLORMAP (f), &color))
break;
xgcv.foreground = color.pixel;
new->gcs[i - 1] = XCreateGC (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
GCForeground, &xgcv);
}
unblock_input ();
if (i < 7)
{
block_input ();
for (i--; i >= 0; i--)
XFreeGC (FRAME_X_DISPLAY (f), new->gcs[i]);
unblock_input ();
if (prev)
prev->next = new->next;
else if (data)
font_put_frame_data (f, Qftx, new->next);
xfree (new);
return NULL;
}
return new->gcs;
}
static int
ftxfont_draw_bitmap (struct frame *f, GC gc_fore, GC *gcs, struct font *font,
unsigned int code, int x, int y, XPoint *p, int size,
int *n, bool flush)
{
struct font_bitmap bitmap;
unsigned char *b;
int i, j;
if (ftfont_get_bitmap (font, code, &bitmap, size > 0x100 ? 1 : 8) < 0)
return 0;
if (size > 0x100)
{
for (i = 0, b = bitmap.buffer; i < bitmap.rows;
i++, b += bitmap.pitch)
{
for (j = 0; j < bitmap.width; j++)
if (b[j / 8] & (1 << (7 - (j % 8))))
{
p[n[0]].x = x + bitmap.left + j;
p[n[0]].y = y - bitmap.top + i;
if (++n[0] == size)
{
XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
gc_fore, p, size, CoordModeOrigin);
n[0] = 0;
}
}
}
if (flush && n[0] > 0)
XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
gc_fore, p, n[0], CoordModeOrigin);
}
else
{
for (i = 0, b = bitmap.buffer; i < bitmap.rows;
i++, b += bitmap.pitch)
{
for (j = 0; j < bitmap.width; j++)
{
int idx = (bitmap.bits_per_pixel == 1
? ((b[j / 8] & (1 << (7 - (j % 8)))) ? 6 : -1)
: (b[j] >> 5) - 1);
if (idx >= 0)
{
XPoint *pp = p + size * idx;
pp[n[idx]].x = x + bitmap.left + j;
pp[n[idx]].y = y - bitmap.top + i;
if (++(n[idx]) == size)
{
XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
idx == 6 ? gc_fore : gcs[idx], pp, size,
CoordModeOrigin);
n[idx] = 0;
}
}
}
}
if (flush)
{
for (i = 0; i < 6; i++)
if (n[i] > 0)
XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
gcs[i], p + 0x100 * i, n[i], CoordModeOrigin);
if (n[6] > 0)
XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
gc_fore, p + 0x600, n[6], CoordModeOrigin);
}
}
/* There is no ftfont_free_bitmap, so do not try to free BITMAP. */
return bitmap.advance;
}
static void
ftxfont_draw_background (struct frame *f, struct font *font, GC gc, int x, int y,
int width)
{
XGCValues xgcv;
XGetGCValues (FRAME_X_DISPLAY (f), gc,
GCForeground | GCBackground, &xgcv);
XSetForeground (FRAME_X_DISPLAY (f), gc, xgcv.background);
XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f), gc,
x, y - FONT_BASE (font), width, FONT_HEIGHT (font));
XSetForeground (FRAME_X_DISPLAY (f), gc, xgcv.foreground);
}
static Lisp_Object
ftxfont_list (struct frame *f, Lisp_Object spec)
{
Lisp_Object list = ftfont_list (f, spec), tail;
for (tail = list; CONSP (tail); tail = XCDR (tail))
ASET (XCAR (tail), FONT_TYPE_INDEX, Qftx);
return list;
}
static Lisp_Object
ftxfont_match (struct frame *f, Lisp_Object spec)
{
Lisp_Object entity = ftfont_match (f, spec);
if (VECTORP (entity))
ASET (entity, FONT_TYPE_INDEX, Qftx);
return entity;
}
static Lisp_Object
ftxfont_open (struct frame *f, Lisp_Object entity, int pixel_size)
{
Lisp_Object font_object = ftfont_open (f, entity, pixel_size);
if (NILP (font_object))
return Qnil;
struct font *font = XFONT_OBJECT (font_object);
font->driver = &ftxfont_driver;
return font_object;
}
static void
ftxfont_close (struct font *font)
{
ftfont_close (font);
}
static int
ftxfont_draw (struct glyph_string *s, int from, int to, int x, int y,
bool with_background)
{
struct frame *f = s->f;
struct face *face = s->face;
struct font *font = s->font;
XPoint p[0x700];
int n[7];
unsigned *code;
int len = to - from;
int i;
GC *gcs;
int xadvance;
n[0] = n[1] = n[2] = n[3] = n[4] = n[5] = n[6] = 0;
USE_SAFE_ALLOCA;
SAFE_NALLOCA (code, 1, len);
block_input ();
if (with_background)
ftxfont_draw_background (f, font, s->gc, x, y, s->width);
for (i = 0; i < len; i++)
code[i] = ((XCHAR2B_BYTE1 (s->char2b + from + i) << 8)
| XCHAR2B_BYTE2 (s->char2b + from + i));
if (face->gc == s->gc)
{
gcs = ftxfont_get_gcs (f, face->foreground, face->background);
}
else
{
XGCValues xgcv;
unsigned long mask = GCForeground | GCBackground;
XGetGCValues (FRAME_X_DISPLAY (f), s->gc, mask, &xgcv);
gcs = ftxfont_get_gcs (f, xgcv.foreground, xgcv.background);
}
if (gcs)
{
if (s->num_clips)
for (i = 0; i < 6; i++)
XSetClipRectangles (FRAME_X_DISPLAY (f), gcs[i], 0, 0,
s->clip, s->num_clips, Unsorted);
for (i = 0; i < len; i++)
{
xadvance = ftxfont_draw_bitmap (f, s->gc, gcs, font, code[i], x, y,
p, 0x100, n, i + 1 == len);
x += (s->padding_p ? 1 : xadvance);
}
if (s->num_clips)
for (i = 0; i < 6; i++)
XSetClipMask (FRAME_X_DISPLAY (f), gcs[i], None);
}
else
{
/* We can't draw with antialiasing.
s->gc should already have a proper clipping setting. */
for (i = 0; i < len; i++)
{
xadvance = ftxfont_draw_bitmap (f, s->gc, NULL, font, code[i], x, y,
p, 0x700, n, i + 1 == len);
x += (s->padding_p ? 1 : xadvance);
}
}
unblock_input ();
SAFE_FREE ();
return len;
}
static int
ftxfont_end_for_frame (struct frame *f)
{
struct ftxfont_frame_data *data = font_get_frame_data (f, Qftx);
block_input ();
while (data)
{
struct ftxfont_frame_data *next = data->next;
int i;
for (i = 0; i < 6; i++)
XFreeGC (FRAME_X_DISPLAY (f), data->gcs[i]);
xfree (data);
data = next;
}
unblock_input ();
font_put_frame_data (f, Qftx, NULL);
return 0;
}
struct font_driver const ftxfont_driver =
{
/* We can't draw a text without device dependent functions. */
.type = LISPSYM_INITIALLY (Qftx),
.get_cache = ftfont_get_cache,
.list = ftxfont_list,
.match = ftxfont_match,
.list_family = ftfont_list_family,
.open = ftxfont_open,
.close = ftxfont_close,
.has_char = ftfont_has_char,
.encode_char = ftfont_encode_char,
.text_extents = ftfont_text_extents,
.draw = ftxfont_draw,
.get_bitmap = ftfont_get_bitmap,
.anchor_point = ftfont_anchor_point,
#ifdef HAVE_LIBOTF
.otf_capability = ftfont_otf_capability,
#endif
.end_for_frame = ftxfont_end_for_frame,
#if defined HAVE_M17N_FLT && defined HAVE_LIBOTF
.shape = ftfont_shape,
#endif
#ifdef HAVE_OTF_GET_VARIATION_GLYPHS
.get_variation_glyphs = ftfont_variation_glyphs,
#endif
.filter_properties = ftfont_filter_properties,
.combining_capability = ftfont_combining_capability,
};
void
syms_of_ftxfont (void)
{
DEFSYM (Qftx, "ftx");
register_font_driver (&ftxfont_driver, NULL);
}
|