about summary refs log tree commit diff stats
path: root/draw.c
blob: 3b6967ca97d1eacd5d89d1730055f2cbb4d9791d (plain) (blame)
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
/*
 * (C)opyright MMIV-MMVI Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details.
 */
#include "dwm.h"
#include <stdio.h>
#include <string.h>
#include <X11/Xlocale.h>

/* static */

static unsigned int
textnw(const char *text, unsigned int len)
{
	XRectangle r;

	if(dc.font.set) {
		XmbTextExtents(dc.font.set, text, len, NULL, &r);
		return r.width;
	}
	return XTextWidth(dc.font.xfont, text, len);
}

static void
drawtext(const char *text, Bool invert)
{
	int x, y, w, h;
	static char buf[256];
	unsigned int len;
	XGCValues gcv;
	XPoint points[5];
	XRectangle r = { dc.x, dc.y, dc.w, dc.h };

	XSetForeground(dpy, dc.gc, invert ? dc.fg : dc.bg);
	XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
	XSetForeground(dpy, dc.gc, dc.border);
	points[0].x = dc.x;
	points[0].y = dc.y;
	points[1].x = dc.w - 1;
	points[1].y = 0;
	points[2].x = 0;
	points[2].y = dc.h - 1;
	points[3].x = -(dc.w - 1);
	points[3].y = 0;
	points[4].x = 0;
	points[4].y = -(dc.h - 1);
	XDrawLines(dpy, dc.drawable, dc.gc, points, 5, CoordModePrevious);

	if(!text)
		return;

	w = 0;
	len = strlen(text);
	if(len >= sizeof(buf))
		len = sizeof(buf) - 1;
	memcpy(buf, text, len);
	buf[len] = 0;

	h = dc.font.ascent + dc.font.descent;
	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
	x = dc.x + (h / 2);

	/* shorten text if necessary */
	while(len && (w = textnw(buf, len)) > dc.w - h)
		buf[--len] = 0;

	if(w > dc.w)
		return; /* too long */

	gcv.foreground = invert ? dc.bg : dc.fg;
	gcv.background = invert ? dc.fg : dc.bg;
	if(dc.font.set) {
		XChangeGC(dpy, dc.gc, GCForeground | GCBackground, &gcv);
		XmbDrawImageString(dpy, dc.drawable, dc.font.set, dc.gc,
				x, y, buf, len);
	}
	else {
		gcv.font = dc.font.xfont->fid;
		XChangeGC(dpy, dc.gc, GCForeground | GCBackground | GCFont, &gcv);
		XDrawImageString(dpy, dc.drawable, dc.gc, x, y, buf, len);
	}
}

/* extern */

void
drawall()
{
	Client *c;

	for(c = clients; c; c = getnext(c->next))
		drawtitle(c);
	drawstatus();
}

void
drawstatus()
{
	int i, x;
	Bool istile = arrange == dotile;

	dc.x = dc.y = 0;
	dc.w = bw;
	drawtext(NULL, !istile);

	dc.w = 0;
	for(i = 0; i < ntags; i++) {
		dc.x += dc.w;
		dc.w = textw(tags[i]);
		if(istile)
			drawtext(tags[i], seltag[i]);
		else
			drawtext(tags[i], !seltag[i]);
	}
	x = dc.x + dc.w;
	dc.w = textw(stext);
	dc.x = bx + bw - dc.w;
	drawtext(stext, !istile);
	if(sel && ((dc.w = dc.x - x) >= bh)) {
		dc.x = x;
		drawtext(sel->name, istile);
	}
	XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, bw, bh, 0, 0);
	XSync(dpy, False);
}

void
drawtitle(Client *c)
{
	int i;
	Bool istile = arrange == dotile;

	if(c == sel && issel) {
		drawstatus();
		XUnmapWindow(dpy, c->title);
		XSetWindowBorder(dpy, c->win, dc.fg);
		return;
	}

	XSetWindowBorder(dpy, c->win, dc.bg);
	XMapWindow(dpy, c->title);

	dc.x = dc.y = 0;

	dc.w = 0;
	for(i = 0; i < ntags; i++) {
		if(c->tags[i]) {
			dc.x += dc.w;
			dc.w = textw(tags[i]);
			drawtext(tags[i], !istile);
		}
	}
	dc.x += dc.w;
	dc.w = textw(c->name);
	drawtext(c->name, !istile);
	XCopyArea(dpy, dc.drawable, c->title, dc.gc, 0, 0, c->tw, c->th, 0, 0);
	XSync(dpy, False);
}

unsigned long
getcolor(const char *colstr)
{
	Colormap cmap = DefaultColormap(dpy, screen);
	XColor color;

	XAllocNamedColor(dpy, cmap, colstr, &color, &color);
	return color.pixel;
}

void
setfont(const char *fontstr)
{
	char **missing, *def;
	int i, n;

	missing = NULL;
	setlocale(LC_ALL, "");
	if(dc.font.set)
		XFreeFontSet(dpy, dc.font.set);
	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
	if(missing) {
		while(n--)
			fprintf(stderr, "missing fontset: %s\n", missing[n]);
		XFreeStringList(missing);
		if(dc.font.set) {
			XFreeFontSet(dpy, dc.font.set);
			dc.font.set = NULL;
		}
	}
	if(dc.font.set) {
		XFontSetExtents *font_extents;
		XFontStruct **xfonts;
		char **font_names;

		dc.font.ascent = dc.font.descent = 0;
		font_extents = XExtentsOfFontSet(dc.font.set);
		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
		for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
			if(dc.font.ascent < (*xfonts)->ascent)
				dc.font.ascent = (*xfonts)->ascent;
			if(dc.font.descent < (*xfonts)->descent)
				dc.font.descent = (*xfonts)->descent;
			xfonts++;
		}
	}
	else {
		if(dc.font.xfont)
			XFreeFont(dpy, dc.font.xfont);
		dc.font.xfont = NULL;
		dc.font.xfont = XLoadQueryFont(dpy, fontstr);
		if (!dc.font.xfont)
			dc.font.xfont = XLoadQueryFont(dpy, "fixed");
		if (!dc.font.xfont)
			eprint("error, cannot init 'fixed' font\n");
		dc.font.ascent = dc.font.xfont->ascent;
		dc.font.descent = dc.font.xfont->descent;
	}
	dc.font.height = dc.font.ascent + dc.font.descent;
}

unsigned int
textw(const char *text)
{
	return textnw(text, strlen(text)) + dc.font.height;
}
to individual allocations. Particularly helpful for (surprise) tests. * ... _(to be continued)_ ### primitives built atop system calls _(Compound arguments are usually passed in by reference. Where the results are compound objects that don't fit in a register, the caller usually passes in allocated memory for it.)_ #### assertions for tests * `check-ints-equal`: fails current test if given ints aren't equal * `check-stream-equal`: fails current test if stream doesn't match string * `check-next-stream-line-equal`: fails current test if next line of stream until newline doesn't match string #### error handling * `error`: takes three arguments, an exit-descriptor, a file and a string (message) Prints out the message to the file and then exits using the provided exit-descriptor. * `error-byte`: like `error` but takes an extra byte value that it prints out at the end of the message. #### predicates * `kernel-string-equal?`: compares a kernel string with a string * `string-equal?`: compares two strings * `stream-data-equal?`: compares a stream with a string * `next-stream-line-equal?`: compares with string the next line in a stream, from `read` index to newline * `slice-empty?`: checks if the `start` and `end` of a slice are equal * `slice-equal?`: compares a slice with a string * `slice-starts-with?`: compares the start of a slice with a string * `slice-ends-with?`: compares the end of a slice with a string #### writing to disk * `write`: string -> file - Can also be used to cat a string into a stream. - Will abort the entire program if there isn't enough room. * `write-stream`: stream -> file - Can also be used to cat one stream into another. - Will abort the entire program if there isn't enough room. * `write-buffered`: string -> buffered-file * `write-slice`: slice -> buffered-file * `flush`: buffered-file * `print-byte`: buffered-file, int #### reading from disk * `read`: file -> stream - Can also be used to cat one stream into another. - Will silently stop reading when destination runs out of space. * `read-byte`: buffered-file -> byte * `read-line`: buffered-file -> stream #### non-IO operations on streams * `new-stream`: allocates space for a stream of size `n`. * `clear-stream`: resets everything in the stream to `0` (except its `length`). * `rewind-stream`: resets the read index of the stream to `0` without modifying its contents. #### reading/writing hex representations of integers * `is-hex-int?`: takes a slice argument, returns boolean result in `EAX` * `parse-hex-int`: takes a slice argument, returns int result in `EAX` * `is-hex-digit?`: takes a 32-bit word containing a single byte, returns boolean result in `EAX`. * `from-hex-char`: takes a hexadecimal digit character in EAX, returns its numeric value in `EAX` * `to-hex-char`: takes a single-digit numeric value in EAX, returns its corresponding hexadecimal character in `EAX` #### tokenization from a stream: * `next-token`: stream, delimiter byte -> slice * `skip-chars-matching`: stream, delimiter byte * `skip-chars-not-matching`: stream, delimiter byte from a slice: * `next-token-from-slice`: start, end, delimiter byte -> slice Given a slice and a delimiter byte, returns a new slice inside the input that ends at the delimiter byte. * `skip-chars-matching-in-slice`: curr, end, delimiter byte -> new-curr (in `EAX`) * `skip-chars-not-matching-in-slice`: curr, end, delimiter byte -> new-curr (in `EAX`) ## Resources * [Single-page cheatsheet for the x86 ISA](https://net.cs.uni-bonn.de/fileadmin/user_upload/plohmann/x86_opcode_structure_and_instruction_overview.pdf) (pdf; [cached local copy](https://github.com/akkartik/mu/blob/master/subx/cheatsheet.pdf)) * [Concise reference for the x86 ISA](https://c9x.me/x86) * [Intel processor manual](http://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-instruction-set-reference-manual-325383.pdf) (pdf) * [Some details on the unconventional organization of this project.](http://akkartik.name/post/four-repos) ## Inspirations * [&ldquo;Creating tiny ELF executables&rdquo;](https://www.muppetlabs.com/~breadbox/software/tiny/teensy.html) * [&ldquo;Bootstrapping a compiler from nothing&rdquo;](http://web.archive.org/web/20061108010907/http://www.rano.org/bcompiler.html) * Forth implementations like [StoneKnifeForth](https://github.com/kragen/stoneknifeforth)