st

commit 6971b078bb82bed45e8ee3664b55fa626da05450
parent 6cc852b5bc6bbfe36ac03ba6e4dea92bccafa2e2
Author: ssnf <ssnf@ssnf.xyz>
Date:   Thu, 24 Apr 2025 14:07:37 +0000

add glow to glyphs

Diffstat:
M
x.c
 | 
38
++++++++++++++++++++++++++++++++++++--

1 file changed, 36 insertions(+), 2 deletions(-)
diff --git a/x.c b/x.c
@@ -1395,9 +1395,11 @@ xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, i
 	int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
 	int winx = borderpx + x * win.cw, winy = borderpx + y * win.ch,
 	    width = charlen * win.cw;
-	Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
-	XRenderColor colfg, colbg;
+	Color *fg, *bg, *temp, revfg, revbg, truefg, truebg, glow;
+	XRenderColor colfg, colbg, colglow;
 	XRectangle r;
+	int dx, dy, i;
+	ushort fgluma, bgluma;
 
 	/* Fallback on color display for attributes not supported by the font */
 	if (base.mode & ATTR_ITALIC && base.mode & ATTR_BOLD) {
@@ -1507,6 +1509,38 @@ xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, i
 	XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
 
 	/* Render the glyphs. */
+	fgluma = fg->color.red * 0.299
+		+ fg->color.green * 0.587
+		+ fg->color.blue * 0.114
+	;
+	bgluma = bg->color.red * 0.299
+		+ bg->color.green * 0.587
+		+ bg->color.blue * 0.114
+	;
+	if (fgluma <= bgluma)
+		goto draw;
+	colglow.red = fg->color.red / 8;
+	colglow.green = fg->color.green / 8;
+	colglow.blue = fg->color.blue / 8;
+	colglow.alpha = 0xffff * (fgluma - bgluma);
+	if (!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colglow, &glow))
+		goto draw;
+	for (dx = -1; dx <= 1; ++dx) {
+		for (dy = -1; dy <= 1; ++dy) {
+			if (dx == 0 && dy == 0)
+				continue;
+			for (i = 0; i < len; ++i) {
+				((XftGlyphFontSpec*)specs)[i].x += dx;
+				((XftGlyphFontSpec*)specs)[i].y += dy;
+			}
+			XftDrawGlyphFontSpec(xw.draw, &glow, specs, len);
+			for (i = 0; i < len; ++i) {
+				((XftGlyphFontSpec*)specs)[i].x -= dx;
+				((XftGlyphFontSpec*)specs)[i].y -= dy;
+			}
+		}
+	}
+draw:
 	XftDrawGlyphFontSpec(xw.draw, fg, specs, len);
 
 	/* Render underline and strikethrough. */