From a8d313686651110cc62f3383130a064c7a41fd51 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Sun, 15 Oct 2006 19:30:09 +0000
Subject: large performance increase

---
 dblbuf.c  |  4 ++++
 refresh.c |  1 +
 xlib.c    | 49 ++++++++++++++++++++++++++++++-------------------
 3 files changed, 35 insertions(+), 19 deletions(-)

diff --git a/dblbuf.c b/dblbuf.c
index ee15148..6213ced 100644
--- a/dblbuf.c
+++ b/dblbuf.c
@@ -117,6 +117,10 @@ void uudisp_predraw_cell(struct uudisp *d, int idx, int x, int color)
 	b->slices[idx].colors[2*x+1] = expand_color(d, color>>4) ^ b->slices[idx].colors[2*x];
 }
 
+void uudisp_finalize_cell(struct uudisp *d, int idx, int x)
+{
+}
+
 void uudisp_draw_glyph(struct uudisp *d, int idx, int x, const void *glyph)
 {
 	struct dblbuf *b = (void *)&d->priv;
diff --git a/refresh.c b/refresh.c
index 9e3ab57..789f7f9 100644
--- a/refresh.c
+++ b/refresh.c
@@ -59,6 +59,7 @@ void uuterm_refresh_row(struct uudisp *d, struct uurow *row, int x1, int x2)
 			const void *glyph = lookup_glyph(d->font, i, chp, ch[(x+3)&3], ch[(x+1)&3], width, part);
 			if (glyph) uudisp_draw_glyph(d, row->idx, x, glyph);
 		}
+		uudisp_finalize_cell(d, row->idx, x);
 	}
 }
 
diff --git a/xlib.c b/xlib.c
index 60d86b1..9078b6e 100644
--- a/xlib.c
+++ b/xlib.c
@@ -23,8 +23,9 @@ struct priv
 	Window window;
 	XIM im;
 	XIC ic;
-	GC wingc, cugc, bggc, fggc, maskgc;
+	GC wingc, cugc, fg, bg, mask_fg, mask_bg;
 	Pixmap pixmap;
+	Pixmap mask;
 	Pixmap *glyph_cache;
 	int *slices_y;
 	int curs_x, curs_y;
@@ -125,19 +126,21 @@ int uudisp_open(struct uudisp *d)
 
 	resize_window(d, px_w, px_h);
 
+	p->mask = XCreatePixmap(p->display, DefaultRootWindow(p->display),
+		d->cell_w, d->cell_h, 1);
+
 	p->wingc = XCreateGC(p->display, p->window, 0, &values);
 	p->cugc = XCreateGC(p->display, p->window, 0, &values);
-	p->fggc = XCreateGC(p->display, p->pixmap, 0, &values);
-	p->bggc = XCreateGC(p->display, p->pixmap, 0, &values);
-	p->maskgc = XCreateGC(p->display, p->pixmap, 0, &values);
+	p->fg = XCreateGC(p->display, p->pixmap, 0, &values);
+	p->bg = XCreateGC(p->display, p->pixmap, 0, &values);
+	p->mask_fg = XCreateGC(p->display, p->mask, 0, &values);
+	p->mask_bg = XCreateGC(p->display, p->mask, 0, &values);
+	XSetClipMask(p->display, p->fg, p->mask);
 	XSetFunction(p->display, p->cugc, GXxor);
-	XSetFunction(p->display, p->fggc, GXor);
-	XSetFunction(p->display, p->bggc, GXcopy);
-	XSetFunction(p->display, p->maskgc, GXandInverted);
+	XSetFunction(p->display, p->mask_fg, GXor);
 	XSetForeground(p->display, p->cugc, WhitePixel(p->display, p->screen));
-	XSetBackground(p->display, p->fggc, BlackPixel(p->display, p->screen));
-	XSetForeground(p->display, p->maskgc, WhitePixel(p->display, p->screen));
-	XSetBackground(p->display, p->maskgc, BlackPixel(p->display, p->screen));
+	XSetForeground(p->display, p->mask_fg, WhitePixel(p->display, p->screen));
+	XSetForeground(p->display, p->mask_bg, BlackPixel(p->display, p->screen));
 
 	npages = (nglyphs+1023) / 1024; // allows up to 64 pixel cell height..
 	p->glyph_cache = calloc(sizeof(p->glyph_cache[0]), npages);
@@ -348,20 +351,28 @@ void uudisp_draw_glyph(struct uudisp *d, int idx, int x, const void *glyph)
 	int gp = g >> 10;
 	g &= 1023;
 
-	XCopyPlane(p->display, p->glyph_cache[gp], p->pixmap, p->maskgc,
-		0, g*d->cell_h, d->cell_w, d->cell_h,
-		x * d->cell_w, idx * d->cell_h, 1);
-	XCopyPlane(p->display, p->glyph_cache[gp], p->pixmap, p->fggc,
-		0, g*d->cell_h, d->cell_w, d->cell_h,
-		x * d->cell_w, idx * d->cell_h, 1);
+	XCopyArea(p->display, p->glyph_cache[gp], p->mask, p->mask_fg,
+		0, g*d->cell_h, d->cell_w, d->cell_h, 0, 0);
 }
 
 void uudisp_predraw_cell(struct uudisp *d, int idx, int x, int color)
 {
 	struct priv *p = (void *)&d->priv;
-	XSetForeground(p->display, p->fggc, p->colors[color&15]);
-	XSetForeground(p->display, p->bggc, p->colors[color>>4]);
-	XFillRectangle(p->display, p->pixmap, p->bggc,
+
+	XSetClipOrigin(p->display, p->fg, x*d->cell_w, idx*d->cell_h);
+	XSetForeground(p->display, p->fg, p->colors[color&15]);
+	XSetForeground(p->display, p->bg, p->colors[color>>4]);
+	XFillRectangle(p->display, p->pixmap, p->bg,
+		x*d->cell_w, idx*d->cell_h, d->cell_w, d->cell_h);
+	XFillRectangle(p->display, p->mask, p->mask_bg,
+		0, 0, d->cell_w, d->cell_h);
+}
+
+void uudisp_finalize_cell(struct uudisp *d, int idx, int x)
+{
+	struct priv *p = (void *)&d->priv;
+	XSetClipMask(p->display, p->fg, p->mask);
+	XFillRectangle(p->display, p->pixmap, p->fg,
 		x*d->cell_w, idx*d->cell_h, d->cell_w, d->cell_h);
 }
 
-- 
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