commit ecd9d212f6a3947821c7c6beb5014efd5a2e49ec
parent b77eca5e5707d6c59647eb2525610d00c0228767
Author: Hiltjo Posthuma <hiltjo@codemadness.org>
Date: Sat, 5 Oct 2024 13:06:55 +0200
sync drw.{c,h} from dmenu
- drw: minor improvement to the nomatches cache
- overhaul utf8decoding and render invalid utf8 sequences as U+FFFD.
Thanks NRK for these improvements!
Diffstat:
| M | drw.c | | | 114 | ++++++++++++++++++++++++++++++++++++++----------------------------------------- |
| M | util.h | | | 1 | + |
2 files changed, 56 insertions(+), 59 deletions(-)
diff --git a/drw.c b/drw.c
@@ -9,54 +9,40 @@
#include "util.h"
#define UTF_INVALID 0xFFFD
-#define UTF_SIZ 4
-static const unsigned char utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
-static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
-static const long utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};
-static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
-
-static long
-utf8decodebyte(const char c, size_t *i)
-{
- for (*i = 0; *i < (UTF_SIZ + 1); ++(*i))
- if (((unsigned char)c & utfmask[*i]) == utfbyte[*i])
- return (unsigned char)c & ~utfmask[*i];
- return 0;
-}
-
-static size_t
-utf8validate(long *u, size_t i)
-{
- if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
- *u = UTF_INVALID;
- for (i = 1; *u > utfmax[i]; ++i)
- ;
- return i;
-}
-
-static size_t
-utf8decode(const char *c, long *u, size_t clen)
+static int
+utf8decode(const char *s_in, long *u, int *err)
{
- size_t i, j, len, type;
- long udecoded;
-
+ static const unsigned char lens[] = {
+ /* 0XXXX */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ /* 10XXX */ 0, 0, 0, 0, 0, 0, 0, 0, /* invalid */
+ /* 110XX */ 2, 2, 2, 2,
+ /* 1110X */ 3, 3,
+ /* 11110 */ 4,
+ /* 11111 */ 0, /* invalid */
+ };
+ static const unsigned char leading_mask[] = { 0x7F, 0x1F, 0x0F, 0x07 };
+ static const unsigned int overlong[] = { 0x0, 0x80, 0x0800, 0x10000 };
+
+ const unsigned char *s = (const unsigned char *)s_in;
+ int len = lens[*s >> 3];
*u = UTF_INVALID;
- if (!clen)
- return 0;
- udecoded = utf8decodebyte(c[0], &len);
- if (!BETWEEN(len, 1, UTF_SIZ))
+ *err = 1;
+ if (len == 0)
return 1;
- for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
- udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
- if (type)
- return j;
+
+ long cp = s[0] & leading_mask[len - 1];
+ for (int i = 1; i < len; ++i) {
+ if (s[i] == '\0' || (s[i] & 0xC0) != 0x80)
+ return i;
+ cp = (cp << 6) | (s[i] & 0x3F);
}
- if (j < len)
- return 0;
- *u = udecoded;
- utf8validate(u, len);
+ /* out of range, surrogate, overlong encoding */
+ if (cp > 0x10FFFF || (cp >> 11) == 0x1B || cp < overlong[len - 1])
+ return len;
+ *err = 0;
+ *u = cp;
return len;
}
@@ -238,11 +224,11 @@ drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int
int
drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
{
- int i, ty, ellipsis_x = 0;
- unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len;
+ int ty, ellipsis_x = 0;
+ unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len, hash, h0, h1;
XftDraw *d = NULL;
Fnt *usedfont, *curfont, *nextfont;
- int utf8strlen, utf8charlen, render = x || y || w || h;
+ int utf8strlen, utf8charlen, utf8err, render = x || y || w || h;
long utf8codepoint = 0;
const char *utf8str;
FcCharSet *fccharset;
@@ -251,9 +237,8 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
XftResult result;
int charexists = 0, overflow = 0;
/* keep track of a couple codepoints for which we have no match. */
- enum { nomatches_len = 64 };
- static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches;
- static unsigned int ellipsis_width = 0;
+ static unsigned int nomatches[128], ellipsis_width, invalid_width;
+ static const char invalid[] = "�";
if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
return 0;
@@ -273,12 +258,14 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
usedfont = drw->fonts;
if (!ellipsis_width && render)
ellipsis_width = drw_fontset_getwidth(drw, "...");
+ if (!invalid_width && render)
+ invalid_width = drw_fontset_getwidth(drw, invalid);
while (1) {
- ew = ellipsis_len = utf8strlen = 0;
+ ew = ellipsis_len = utf8err = utf8charlen = utf8strlen = 0;
utf8str = text;
nextfont = NULL;
while (*text) {
- utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
+ utf8charlen = utf8decode(text, &utf8codepoint, &utf8err);
for (curfont = drw->fonts; curfont; curfont = curfont->next) {
charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
if (charexists) {
@@ -300,9 +287,9 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
else
utf8strlen = ellipsis_len;
} else if (curfont == usedfont) {
- utf8strlen += utf8charlen;
text += utf8charlen;
- ew += tmpw;
+ utf8strlen += utf8err ? 0 : utf8charlen;
+ ew += utf8err ? 0 : tmpw;
} else {
nextfont = curfont;
}
@@ -310,7 +297,7 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
}
}
- if (overflow || !charexists || nextfont)
+ if (overflow || !charexists || nextfont || utf8err)
break;
else
charexists = 0;
@@ -325,6 +312,12 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
x += ew;
w -= ew;
}
+ if (utf8err && (!render || invalid_width < w)) {
+ if (render)
+ drw_text(drw, x, y, w, h, 0, invalid, invert);
+ x += invalid_width;
+ w -= invalid_width;
+ }
if (render && overflow)
drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
@@ -338,11 +331,14 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
* character must be drawn. */
charexists = 1;
- for (i = 0; i < nomatches_len; ++i) {
- /* avoid calling XftFontMatch if we know we won't find a match */
- if (utf8codepoint == nomatches.codepoint[i])
- goto no_match;
- }
+ hash = (unsigned int)utf8codepoint;
+ hash = ((hash >> 16) ^ hash) * 0x21F0AAAD;
+ hash = ((hash >> 15) ^ hash) * 0xD35A2D97;
+ h0 = ((hash >> 15) ^ hash) % LENGTH(nomatches);
+ h1 = (hash >> 17) % LENGTH(nomatches);
+ /* avoid expensive XftFontMatch call when we know we won't find a match */
+ if (nomatches[h0] == utf8codepoint || nomatches[h1] == utf8codepoint)
+ goto no_match;
fccharset = FcCharSetCreate();
FcCharSetAddChar(fccharset, utf8codepoint);
@@ -371,7 +367,7 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
curfont->next = usedfont;
} else {
xfont_free(usedfont);
- nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint;
+ nomatches[nomatches[h0] ? h1 : h0] = utf8codepoint;
no_match:
usedfont = drw->fonts;
}
diff --git a/util.h b/util.h
@@ -3,6 +3,7 @@
#define MAX(A, B) ((A) > (B) ? (A) : (B))
#define MIN(A, B) ((A) < (B) ? (A) : (B))
#define BETWEEN(X, A, B) ((A) <= (X) && (X) <= (B))
+#define LENGTH(X) (sizeof (X) / sizeof (X)[0])
void die(const char *fmt, ...);
void *ecalloc(size_t nmemb, size_t size);
