You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
194 lines
6.1 KiB
194 lines
6.1 KiB
/* |
|
* Copyright 2018 Avi Halachmi (:avih) avihpit@yahoo.com https://github.com/avih |
|
* MIT/X Consortium License |
|
*/ |
|
|
|
#include <X11/Xft/Xft.h> |
|
#include "st.h" |
|
#include "boxdraw_data.h" |
|
|
|
/* Rounded non-negative integers division of n / d */ |
|
#define DIV(n, d) (((n) + (d) / 2) / (d)) |
|
|
|
static Display *xdpy; |
|
static Colormap xcmap; |
|
static XftDraw *xd; |
|
static Visual *xvis; |
|
|
|
static void drawbox(int, int, int, int, XftColor *, XftColor *, ushort); |
|
static void drawboxlines(int, int, int, int, XftColor *, ushort); |
|
|
|
/* public API */ |
|
|
|
void |
|
boxdraw_xinit(Display *dpy, Colormap cmap, XftDraw *draw, Visual *vis) |
|
{ |
|
xdpy = dpy; xcmap = cmap; xd = draw, xvis = vis; |
|
} |
|
|
|
int |
|
isboxdraw(Rune u) |
|
{ |
|
Rune block = u & ~0xff; |
|
return (boxdraw && block == 0x2500 && boxdata[(uint8_t)u]) || |
|
(boxdraw_braille && block == 0x2800); |
|
} |
|
|
|
/* the "index" is actually the entire shape data encoded as ushort */ |
|
ushort |
|
boxdrawindex(const Glyph *g) |
|
{ |
|
if (boxdraw_braille && (g->u & ~0xff) == 0x2800) |
|
return BRL | (uint8_t)g->u; |
|
if (boxdraw_bold && (g->mode & ATTR_BOLD)) |
|
return BDB | boxdata[(uint8_t)g->u]; |
|
return boxdata[(uint8_t)g->u]; |
|
} |
|
|
|
void |
|
drawboxes(int x, int y, int cw, int ch, XftColor *fg, XftColor *bg, |
|
const XftGlyphFontSpec *specs, int len) |
|
{ |
|
for ( ; len-- > 0; x += cw, specs++) |
|
drawbox(x, y, cw, ch, fg, bg, (ushort)specs->glyph); |
|
} |
|
|
|
/* implementation */ |
|
|
|
void |
|
drawbox(int x, int y, int w, int h, XftColor *fg, XftColor *bg, ushort bd) |
|
{ |
|
ushort cat = bd & ~(BDB | 0xff); /* mask out bold and data */ |
|
if (bd & (BDL | BDA)) { |
|
/* lines (light/double/heavy/arcs) */ |
|
drawboxlines(x, y, w, h, fg, bd); |
|
|
|
} else if (cat == BBD) { |
|
/* lower (8-X)/8 block */ |
|
int d = DIV((uint8_t)bd * h, 8); |
|
XftDrawRect(xd, fg, x, y + d, w, h - d); |
|
|
|
} else if (cat == BBU) { |
|
/* upper X/8 block */ |
|
XftDrawRect(xd, fg, x, y, w, DIV((uint8_t)bd * h, 8)); |
|
|
|
} else if (cat == BBL) { |
|
/* left X/8 block */ |
|
XftDrawRect(xd, fg, x, y, DIV((uint8_t)bd * w, 8), h); |
|
|
|
} else if (cat == BBR) { |
|
/* right (8-X)/8 block */ |
|
int d = DIV((uint8_t)bd * w, 8); |
|
XftDrawRect(xd, fg, x + d, y, w - d, h); |
|
|
|
} else if (cat == BBQ) { |
|
/* Quadrants */ |
|
int w2 = DIV(w, 2), h2 = DIV(h, 2); |
|
if (bd & TL) |
|
XftDrawRect(xd, fg, x, y, w2, h2); |
|
if (bd & TR) |
|
XftDrawRect(xd, fg, x + w2, y, w - w2, h2); |
|
if (bd & BL) |
|
XftDrawRect(xd, fg, x, y + h2, w2, h - h2); |
|
if (bd & BR) |
|
XftDrawRect(xd, fg, x + w2, y + h2, w - w2, h - h2); |
|
|
|
} else if (bd & BBS) { |
|
/* Shades - data is 1/2/3 for 25%/50%/75% alpha, respectively */ |
|
int d = (uint8_t)bd; |
|
XftColor xfc; |
|
XRenderColor xrc = { .alpha = 0xffff }; |
|
|
|
xrc.red = DIV(fg->color.red * d + bg->color.red * (4 - d), 4); |
|
xrc.green = DIV(fg->color.green * d + bg->color.green * (4 - d), 4); |
|
xrc.blue = DIV(fg->color.blue * d + bg->color.blue * (4 - d), 4); |
|
|
|
XftColorAllocValue(xdpy, xvis, xcmap, &xrc, &xfc); |
|
XftDrawRect(xd, &xfc, x, y, w, h); |
|
XftColorFree(xdpy, xvis, xcmap, &xfc); |
|
|
|
} else if (cat == BRL) { |
|
/* braille, each data bit corresponds to one dot at 2x4 grid */ |
|
int w1 = DIV(w, 2); |
|
int h1 = DIV(h, 4), h2 = DIV(h, 2), h3 = DIV(3 * h, 4); |
|
|
|
if (bd & 1) XftDrawRect(xd, fg, x, y, w1, h1); |
|
if (bd & 2) XftDrawRect(xd, fg, x, y + h1, w1, h2 - h1); |
|
if (bd & 4) XftDrawRect(xd, fg, x, y + h2, w1, h3 - h2); |
|
if (bd & 8) XftDrawRect(xd, fg, x + w1, y, w - w1, h1); |
|
if (bd & 16) XftDrawRect(xd, fg, x + w1, y + h1, w - w1, h2 - h1); |
|
if (bd & 32) XftDrawRect(xd, fg, x + w1, y + h2, w - w1, h3 - h2); |
|
if (bd & 64) XftDrawRect(xd, fg, x, y + h3, w1, h - h3); |
|
if (bd & 128) XftDrawRect(xd, fg, x + w1, y + h3, w - w1, h - h3); |
|
|
|
} |
|
} |
|
|
|
void |
|
drawboxlines(int x, int y, int w, int h, XftColor *fg, ushort bd) |
|
{ |
|
/* s: stem thickness. width/8 roughly matches underscore thickness. */ |
|
/* We draw bold as 1.5 * normal-stem and at least 1px thicker. */ |
|
/* doubles draw at least 3px, even when w or h < 3. bold needs 6px. */ |
|
int mwh = MIN(w, h); |
|
int base_s = MAX(1, DIV(mwh, 8)); |
|
int bold = (bd & BDB) && mwh >= 6; /* possibly ignore boldness */ |
|
int s = bold ? MAX(base_s + 1, DIV(3 * base_s, 2)) : base_s; |
|
int w2 = DIV(w - s, 2), h2 = DIV(h - s, 2); |
|
/* the s-by-s square (x + w2, y + h2, s, s) is the center texel. */ |
|
/* The base length (per direction till edge) includes this square. */ |
|
|
|
int light = bd & (LL | LU | LR | LD); |
|
int double_ = bd & (DL | DU | DR | DD); |
|
|
|
if (light) { |
|
/* d: additional (negative) length to not-draw the center */ |
|
/* texel - at arcs and avoid drawing inside (some) doubles */ |
|
int arc = bd & BDA; |
|
int multi_light = light & (light - 1); |
|
int multi_double = double_ & (double_ - 1); |
|
/* light crosses double only at DH+LV, DV+LH (ref. shapes) */ |
|
int d = arc || (multi_double && !multi_light) ? -s : 0; |
|
|
|
if (bd & LL) |
|
XftDrawRect(xd, fg, x, y + h2, w2 + s + d, s); |
|
if (bd & LU) |
|
XftDrawRect(xd, fg, x + w2, y, s, h2 + s + d); |
|
if (bd & LR) |
|
XftDrawRect(xd, fg, x + w2 - d, y + h2, w - w2 + d, s); |
|
if (bd & LD) |
|
XftDrawRect(xd, fg, x + w2, y + h2 - d, s, h - h2 + d); |
|
} |
|
|
|
/* double lines - also align with light to form heavy when combined */ |
|
if (double_) { |
|
/* |
|
* going clockwise, for each double-ray: p is additional length |
|
* to the single-ray nearer to the previous direction, and n to |
|
* the next. p and n adjust from the base length to lengths |
|
* which consider other doubles - shorter to avoid intersections |
|
* (p, n), or longer to draw the far-corner texel (n). |
|
*/ |
|
int dl = bd & DL, du = bd & DU, dr = bd & DR, dd = bd & DD; |
|
if (dl) { |
|
int p = dd ? -s : 0, n = du ? -s : dd ? s : 0; |
|
XftDrawRect(xd, fg, x, y + h2 + s, w2 + s + p, s); |
|
XftDrawRect(xd, fg, x, y + h2 - s, w2 + s + n, s); |
|
} |
|
if (du) { |
|
int p = dl ? -s : 0, n = dr ? -s : dl ? s : 0; |
|
XftDrawRect(xd, fg, x + w2 - s, y, s, h2 + s + p); |
|
XftDrawRect(xd, fg, x + w2 + s, y, s, h2 + s + n); |
|
} |
|
if (dr) { |
|
int p = du ? -s : 0, n = dd ? -s : du ? s : 0; |
|
XftDrawRect(xd, fg, x + w2 - p, y + h2 - s, w - w2 + p, s); |
|
XftDrawRect(xd, fg, x + w2 - n, y + h2 + s, w - w2 + n, s); |
|
} |
|
if (dd) { |
|
int p = dr ? -s : 0, n = dl ? -s : dr ? s : 0; |
|
XftDrawRect(xd, fg, x + w2 + s, y + h2 - p, s, h - h2 + p); |
|
XftDrawRect(xd, fg, x + w2 - s, y + h2 - n, s, h - h2 + n); |
|
} |
|
} |
|
}
|
|
|