Added source

1 files changed, 398 insertions, 0 deletions

diff --git a/drw.c b/drw.c
new file mode 100644
index 0000000..f49200b
--- /dev/null
+++ b/drw.c
@@ -0,0 +1,398 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <X11/Xlib.h>
+#include <X11/Xft/Xft.h>
+
+#include "drw.h"
+#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)
+{
+	size_t i, j, len, type;
+	long udecoded;
+
+	*u = UTF_INVALID;
+	if (!clen)
+		return 0;
+	udecoded = utf8decodebyte(c[0], &len);
+	if (!BETWEEN(len, 1, UTF_SIZ))
+		return 1;
+	for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
+		udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
+		if (type)
+			return j;
+	}
+	if (j < len)
+		return 0;
+	*u = udecoded;
+	utf8validate(u, len);
+
+	return len;
+}
+
+Drw *
+drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h)
+{
+	Drw *drw;
+
+	drw = ecalloc(1, sizeof(Drw));
+	drw->dpy = dpy;
+	drw->screen = screen;
+	drw->root = root;
+	drw->w = w;
+	drw->h = h;
+	drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
+	drw->gc = XCreateGC(dpy, root, 0, NULL);
+	drw->fontcount = 0;
+	XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
+
+	return drw;
+}
+
+void
+drw_resize(Drw *drw, unsigned int w, unsigned int h)
+{
+	drw->w = w;
+	drw->h = h;
+	if (drw->drawable)
+		XFreePixmap(drw->dpy, drw->drawable);
+	drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
+}
+
+void
+drw_free(Drw *drw)
+{
+	size_t i;
+
+	for (i = 0; i < drw->fontcount; i++)
+		drw_font_free(drw->fonts[i]);
+	XFreePixmap(drw->dpy, drw->drawable);
+	XFreeGC(drw->dpy, drw->gc);
+	free(drw);
+}
+
+/* This function is an implementation detail. Library users should use
+ * drw_font_create instead.
+ */
+static Fnt *
+drw_font_xcreate(Drw *drw, const char *fontname, FcPattern *fontpattern)
+{
+	Fnt *font;
+	XftFont *xfont = NULL;
+	FcPattern *pattern = NULL;
+
+	if (fontname) {
+		/* Using the pattern found at font->xfont->pattern does not yield same
+		 * the same substitution results as using the pattern returned by
+		 * FcNameParse; using the latter results in the desired fallback
+		 * behaviour whereas the former just results in
+		 * missing-character-rectangles being drawn, at least with some fonts.
+		 */
+		if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
+			fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
+			return NULL;
+		}
+		if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
+			fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
+			XftFontClose(drw->dpy, xfont);
+			return NULL;
+		}
+	} else if (fontpattern) {
+		if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
+			fprintf(stderr, "error, cannot load font pattern.\n");
+			return NULL;
+		}
+	} else {
+		die("no font specified.\n");
+	}
+
+	font = ecalloc(1, sizeof(Fnt));
+	font->xfont = xfont;
+	font->pattern = pattern;
+	font->ascent = xfont->ascent;
+	font->descent = xfont->descent;
+	font->h = font->ascent + font->descent;
+	font->dpy = drw->dpy;
+
+	return font;
+}
+
+Fnt*
+drw_font_create(Drw *drw, const char *fontname)
+{
+	return drw_font_xcreate(drw, fontname, NULL);
+}
+
+void
+drw_load_fonts(Drw* drw, const char *fonts[], size_t fontcount)
+{
+	size_t i;
+	Fnt *font;
+
+	for (i = 0; i < fontcount; i++) {
+		if (drw->fontcount >= DRW_FONT_CACHE_SIZE) {
+			die("font cache exhausted.\n");
+		} else if ((font = drw_font_xcreate(drw, fonts[i], NULL))) {
+			drw->fonts[drw->fontcount++] = font;
+		}
+	}
+}
+
+void
+drw_font_free(Fnt *font)
+{
+	if (!font)
+		return;
+	if (font->pattern)
+		FcPatternDestroy(font->pattern);
+	XftFontClose(font->dpy, font->xfont);
+	free(font);
+}
+
+Clr *
+drw_clr_create(Drw *drw, const char *clrname)
+{
+	Clr *clr;
+
+	clr = ecalloc(1, sizeof(Clr));
+	if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
+	                       DefaultColormap(drw->dpy, drw->screen),
+	                       clrname, &clr->rgb))
+		die("error, cannot allocate color '%s'\n", clrname);
+	clr->pix = clr->rgb.pixel;
+
+	return clr;
+}
+
+void
+drw_clr_free(Clr *clr)
+{
+	free(clr);
+}
+
+void
+drw_setscheme(Drw *drw, ClrScheme *scheme)
+{
+	drw->scheme = scheme;
+}
+
+void
+drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int empty, int invert)
+{
+	if (!drw->scheme)
+		return;
+	XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->bg->pix : drw->scheme->fg->pix);
+	if (filled)
+		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w + 1, h + 1);
+	else if (empty)
+		XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
+}
+
+int
+drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert)
+{
+	char buf[1024];
+	int tx, ty, th;
+	Extnts tex;
+	XftDraw *d = NULL;
+	Fnt *curfont, *nextfont;
+	size_t i, len;
+	int utf8strlen, utf8charlen, render;
+	long utf8codepoint = 0;
+	const char *utf8str;
+	FcCharSet *fccharset;
+	FcPattern *fcpattern;
+	FcPattern *match;
+	XftResult result;
+	int charexists = 0;
+
+	if (!drw->scheme || !drw->fontcount)
+		return 0;
+
+	if (!(render = x || y || w || h)) {
+		w = ~w;
+	} else {
+		XSetForeground(drw->dpy, drw->gc, invert ?
+		               drw->scheme->fg->pix : drw->scheme->bg->pix);
+		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
+		d = XftDrawCreate(drw->dpy, drw->drawable,
+		                  DefaultVisual(drw->dpy, drw->screen),
+		                  DefaultColormap(drw->dpy, drw->screen));
+	}
+
+	curfont = drw->fonts[0];
+	while (1) {
+		utf8strlen = 0;
+		utf8str = text;
+		nextfont = NULL;
+		while (*text) {
+			utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
+			for (i = 0; i < drw->fontcount; i++) {
+				charexists = charexists || XftCharExists(drw->dpy, drw->fonts[i]->xfont, utf8codepoint);
+				if (charexists) {
+					if (drw->fonts[i] == curfont) {
+						utf8strlen += utf8charlen;
+						text += utf8charlen;
+					} else {
+						nextfont = drw->fonts[i];
+					}
+					break;
+				}
+			}
+
+			if (!charexists || (nextfont && nextfont != curfont))
+				break;
+			else
+				charexists = 0;
+		}
+
+		if (utf8strlen) {
+			drw_font_getexts(curfont, utf8str, utf8strlen, &tex);
+			/* shorten text if necessary */
+			for (len = MIN(utf8strlen, (sizeof buf) - 1); len && (tex.w > w - drw->fonts[0]->h || w < drw->fonts[0]->h); len--)
+				drw_font_getexts(curfont, utf8str, len, &tex);
+
+			if (len) {
+				memcpy(buf, utf8str, len);
+				buf[len] = '\0';
+				if (len < utf8strlen)
+					for (i = len; i && i > len - 3; buf[--i] = '.');
+
+				if (render) {
+					th = curfont->ascent + curfont->descent;
+					ty = y + (h / 2) - (th / 2) + curfont->ascent;
+					tx = x + (h / 2);
+					XftDrawStringUtf8(d, invert ? &drw->scheme->bg->rgb : &drw->scheme->fg->rgb, curfont->xfont, tx, ty, (XftChar8 *)buf, len);
+				}
+				x += tex.w;
+				w -= tex.w;
+			}
+		}
+
+		if (!*text) {
+			break;
+		} else if (nextfont) {
+			charexists = 0;
+			curfont = nextfont;
+		} else {
+			/* Regardless of whether or not a fallback font is found, the
+			 * character must be drawn.
+			 */
+			charexists = 1;
+
+			if (drw->fontcount >= DRW_FONT_CACHE_SIZE)
+				continue;
+
+			fccharset = FcCharSetCreate();
+			FcCharSetAddChar(fccharset, utf8codepoint);
+
+			if (!drw->fonts[0]->pattern) {
+				/* Refer to the comment in drw_font_xcreate for more
+				 * information. */
+				die("the first font in the cache must be loaded from a font string.\n");
+			}
+
+			fcpattern = FcPatternDuplicate(drw->fonts[0]->pattern);
+			FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
+			FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
+
+			FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
+			FcDefaultSubstitute(fcpattern);
+			match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
+
+			FcCharSetDestroy(fccharset);
+			FcPatternDestroy(fcpattern);
+
+			if (match) {
+				curfont = drw_font_xcreate(drw, NULL, match);
+				if (curfont && XftCharExists(drw->dpy, curfont->xfont, utf8codepoint)) {
+					drw->fonts[drw->fontcount++] = curfont;
+				} else {
+					drw_font_free(curfont);
+					curfont = drw->fonts[0];
+				}
+			}
+		}
+	}
+	if (d)
+		XftDrawDestroy(d);
+
+	return x;
+}
+
+void
+drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
+{
+	XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
+	XSync(drw->dpy, False);
+}
+
+void
+drw_font_getexts(Fnt *font, const char *text, unsigned int len, Extnts *tex)
+{
+	XGlyphInfo ext;
+
+	XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
+	tex->h = font->h;
+	tex->w = ext.xOff;
+}
+
+unsigned int
+drw_font_getexts_width(Fnt *font, const char *text, unsigned int len)
+{
+	Extnts tex;
+
+	drw_font_getexts(font, text, len, &tex);
+
+	return tex.w;
+}
+
+Cur *
+drw_cur_create(Drw *drw, int shape)
+{
+	Cur *cur;
+
+	cur = ecalloc(1, sizeof(Cur));
+	cur->cursor = XCreateFontCursor(drw->dpy, shape);
+
+	return cur;
+}
+
+void
+drw_cur_free(Drw *drw, Cur *cursor)
+{
+	if (!cursor)
+		return;
+	XFreeCursor(drw->dpy, cursor->cursor);
+	free(cursor);
+}