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neodotfiles/dwm/drw.c

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/* 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 <Imlib2.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, Visual *visual, unsigned int depth, Colormap cmap) {
Drw *drw = ecalloc(1, sizeof(Drw));
drw->dpy = dpy;
drw->screen = screen;
drw->root = root;
drw->w = w;
drw->h = h;
drw->visual = visual;
drw->depth = depth;
drw->cmap = cmap;
drw->drawable = XCreatePixmap(dpy, root, w, h, depth);
drw->picture = XRenderCreatePicture(dpy, drw->drawable, XRenderFindVisualFormat(dpy, visual), 0, NULL);
drw->gc = XCreateGC(dpy, drw->drawable, 0, NULL);
XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
return drw;
}
void drw_resize(Drw *drw, unsigned int w, unsigned int h) {
if (!drw)
return;
drw->w = w;
drw->h = h;
if (drw->picture)
XRenderFreePicture(drw->dpy, drw->picture);
if (drw->drawable)
XFreePixmap(drw->dpy, drw->drawable);
drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, drw->depth);
drw->picture = XRenderCreatePicture(drw->dpy, drw->drawable, XRenderFindVisualFormat(drw->dpy, drw->visual), 0, NULL);
}
void drw_free(Drw *drw) {
XRenderFreePicture(drw->dpy, drw->picture);
XFreePixmap(drw->dpy, drw->drawable);
XFreeGC(drw->dpy, drw->gc);
drw_fontset_free(drw->fonts);
free(drw);
}
/* This function is an implementation detail. Library users should use
* drw_fontset_create instead.
*/
static Fnt * xfont_create(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 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 from name: '%s'\n", fontname);
return NULL;
}
if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
XftFontClose(drw->dpy, xfont);
return NULL;
}
} else if (fontpattern) {
if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
fprintf(stderr, "error, cannot load font from pattern.\n");
return NULL;
}
} else {
die("no font specified.");
}
font = ecalloc(1, sizeof(Fnt));
font->xfont = xfont;
font->pattern = pattern;
font->h = xfont->ascent + xfont->descent;
font->dpy = drw->dpy;
return font;
}
static void xfont_free(Fnt *font) {
if (!font)
return;
if (font->pattern)
FcPatternDestroy(font->pattern);
XftFontClose(font->dpy, font->xfont);
free(font);
}
Fnt* drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount) {
Fnt *cur, *ret = NULL;
size_t i;
if (!drw || !fonts)
return NULL;
for (i = 1; i <= fontcount; i++) {
if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
cur->next = ret;
ret = cur;
}
}
return (drw->fonts = ret);
}
void drw_fontset_free(Fnt *font) {
if (font) {
drw_fontset_free(font->next);
xfont_free(font);
}
}
void drw_clr_create(Drw *drw, Clr *dest, const char *clrname, unsigned int alpha) {
if (!drw || !dest || !clrname)
return;
if (!XftColorAllocName(drw->dpy, drw->visual, drw->cmap,
clrname, dest))
die("error, cannot allocate color '%s'", clrname);
dest->pixel = (dest->pixel & 0x00ffffffU) | (alpha << 24);
}
/* Wrapper to create color schemes. The caller has to call free(3) on the
* returned color scheme when done using it. */
Clr *drw_scm_create(Drw *drw, const char *clrnames[], const unsigned int alphas[], size_t clrcount) {
size_t i;
Clr *ret;
/* need at least two colors for a scheme */
if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
return NULL;
for (i = 0; i < clrcount; i++)
drw_clr_create(drw, &ret[i], clrnames[i], alphas[i]);
return ret;
}
void drw_setfontset(Drw *drw, Fnt *set) {
if (drw)
drw->fonts = set;
}
void drw_setscheme(Drw *drw, Clr *scm) {
if (drw)
drw->scheme = scm;
}
Picture drw_picture_create_resized(Drw *drw, char *src, unsigned int srcw, unsigned int srch, unsigned int dstw, unsigned int dsth) {
Pixmap pm;
Picture pic;
GC gc;
if (srcw <= (dstw << 1u) && srch <= (dsth << 1u)) {
XImage img = {
srcw, srch, 0, ZPixmap, src,
ImageByteOrder(drw->dpy), BitmapUnit(drw->dpy), BitmapBitOrder(drw->dpy), 32,
32, 0, 32,
0, 0, 0
};
XInitImage(&img);
pm = XCreatePixmap(drw->dpy, drw->root, srcw, srch, 32);
gc = XCreateGC(drw->dpy, pm, 0, NULL);
XPutImage(drw->dpy, pm, gc, &img, 0, 0, 0, 0, srcw, srch);
XFreeGC(drw->dpy, gc);
pic = XRenderCreatePicture(drw->dpy, pm, XRenderFindStandardFormat(drw->dpy, PictStandardARGB32), 0, NULL);
XFreePixmap(drw->dpy, pm);
XRenderSetPictureFilter(drw->dpy, pic, FilterBilinear, NULL, 0);
XTransform xf;
xf.matrix[0][0] = (srcw << 16u) / dstw; xf.matrix[0][1] = 0; xf.matrix[0][2] = 0;
xf.matrix[1][0] = 0; xf.matrix[1][1] = (srch << 16u) / dsth; xf.matrix[1][2] = 0;
xf.matrix[2][0] = 0; xf.matrix[2][1] = 0; xf.matrix[2][2] = 65536;
XRenderSetPictureTransform(drw->dpy, pic, &xf);
} else {
Imlib_Image origin = imlib_create_image_using_data(srcw, srch, (DATA32 *)src);
if (!origin) return None;
imlib_context_set_image(origin);
imlib_image_set_has_alpha(1);
Imlib_Image scaled = imlib_create_cropped_scaled_image(0, 0, srcw, srch, dstw, dsth);
imlib_free_image_and_decache();
if (!scaled) return None;
imlib_context_set_image(scaled);
imlib_image_set_has_alpha(1);
XImage img = {
dstw, dsth, 0, ZPixmap, (char *)imlib_image_get_data_for_reading_only(),
ImageByteOrder(drw->dpy), BitmapUnit(drw->dpy), BitmapBitOrder(drw->dpy), 32,
32, 0, 32,
0, 0, 0
};
XInitImage(&img);
pm = XCreatePixmap(drw->dpy, drw->root, dstw, dsth, 32);
gc = XCreateGC(drw->dpy, pm, 0, NULL);
XPutImage(drw->dpy, pm, gc, &img, 0, 0, 0, 0, dstw, dsth);
imlib_free_image_and_decache();
XFreeGC(drw->dpy, gc);
pic = XRenderCreatePicture(drw->dpy, pm, XRenderFindStandardFormat(drw->dpy, PictStandardARGB32), 0, NULL);
XFreePixmap(drw->dpy, pm);
}
return pic;
}
void drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert) {
if (!drw || !drw->scheme)
return;
XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
if (filled)
XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
else
XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
}
void drw_pic(Drw *drw, int x, int y, unsigned int w, unsigned int h, Picture pic) {
if (!drw)
return;
XRenderComposite(drw->dpy, PictOpOver, pic, None, drw->picture, 0, 0, 0, 0, x, y, w, h);
}
/* wrapper function to scale and draw a polygon with X11 */
void drw_polygon(Drw *drw, int x, int y, int ow, int oh, int sw, int sh, const XPoint *points, int npoints, int shape, int filled) {
if (!drw || !drw->scheme)
return;
XSetForeground(drw->dpy, drw->gc, drw->scheme[ColFg].pixel);
if (!filled) { /* reduces the scaled width and height by 1 when drawing the outline to compensate for X11 drawing the line 1 pixel over */
sw -= 1;
sh -= 1;
}
XPoint scaledpoints[npoints];
memcpy(scaledpoints, points, npoints);
for (int v = 0; v < npoints; v++)
scaledpoints[v] = (XPoint){ .x = points[v].x * sw / ow + x, .y = points[v].y * sh / oh + y };
if (filled)
XFillPolygon(drw->dpy, drw->drawable, drw->gc, scaledpoints, npoints, shape, CoordModeOrigin); /* Change shape to 'Convex' or 'Complex' in dwm.c if the shape is not 'Nonconvex' */
else
XDrawLines(drw->dpy, drw->drawable, drw->gc, scaledpoints, npoints, CoordModeOrigin);
}
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;
XftDraw *d = NULL;
Fnt *usedfont, *curfont, *nextfont;
int utf8strlen, utf8charlen, render = x || y || w || h;
long utf8codepoint = 0;
const char *utf8str;
FcCharSet *fccharset;
FcPattern *fcpattern;
FcPattern *match;
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;
if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
return 0;
if (!render) {
w = invert ? invert : ~invert;
} else {
XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
d = XftDrawCreate(drw->dpy, drw->drawable, drw->visual, drw->cmap);
x += lpad;
w -= lpad;
}
usedfont = drw->fonts;
if (!ellipsis_width && render)
ellipsis_width = drw_fontset_getwidth(drw, "...");
while (1) {
ew = ellipsis_len = utf8strlen = 0;
utf8str = text;
nextfont = NULL;
while (*text) {
utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
for (curfont = drw->fonts; curfont; curfont = curfont->next) {
charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
if (charexists) {
drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);
if (ew + ellipsis_width <= w) {
/* keep track where the ellipsis still fits */
ellipsis_x = x + ew;
ellipsis_w = w - ew;
ellipsis_len = utf8strlen;
}
if (ew + tmpw > w) {
overflow = 1;
/* called from drw_fontset_getwidth_clamp():
* it wants the width AFTER the overflow
*/
if (!render)
x += tmpw;
else
utf8strlen = ellipsis_len;
} else if (curfont == usedfont) {
utf8strlen += utf8charlen;
text += utf8charlen;
ew += tmpw;
} else {
nextfont = curfont;
}
break;
}
}
if (overflow || !charexists || nextfont)
break;
else
charexists = 0;
}
if (utf8strlen) {
if (render) {
ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);
}
x += ew;
w -= ew;
}
if (render && overflow)
drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
if (!*text || overflow) {
break;
} else if (nextfont) {
charexists = 0;
usedfont = nextfont;
} else {
/* Regardless of whether or not a fallback font is found, the
* 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;
}
fccharset = FcCharSetCreate();
FcCharSetAddChar(fccharset, utf8codepoint);
if (!drw->fonts->pattern) {
/* Refer to the comment in xfont_create for more information. */
die("the first font in the cache must be loaded from a font string.");
}
fcpattern = FcPatternDuplicate(drw->fonts->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) {
usedfont = xfont_create(drw, NULL, match);
if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
; /* NOP */
curfont->next = usedfont;
} else {
xfont_free(usedfont);
nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint;
no_match:
usedfont = drw->fonts;
}
}
}
}
if (d)
XftDrawDestroy(d);
return x + (render ? w : 0);
}
void drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h) {
if (!drw)
return;
XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
XSync(drw->dpy, False);
}
unsigned int drw_fontset_getwidth(Drw *drw, const char *text) {
if (!drw || !drw->fonts || !text)
return 0;
return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
}
unsigned int drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n) {
unsigned int tmp = 0;
if (drw && drw->fonts && text && n)
tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
return MIN(n, tmp);
}
void drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h) {
XGlyphInfo ext;
if (!font || !text)
return;
XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
if (w)
*w = ext.xOff;
if (h)
*h = font->h;
}
Cur *drw_cur_create(Drw *drw, int shape) {
Cur *cur;
if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
return NULL;
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);
}
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