From 1030dc837b10a03a02a85d5504cbeec168ce49e2 Mon Sep 17 00:00:00 2001
From: Bernie Innocenti <bernie@codewiz.org>
Date: Mon, 03 May 2010 21:53:47 +0000
Subject: Import XaoS r489 (trunk after version 3.5)

---
(limited to 'src/engine/edge2d.c')

diff --git a/src/engine/edge2d.c b/src/engine/edge2d.c
new file mode 100644
index 0000000..4402b42
--- /dev/null
+++ b/src/engine/edge2d.c
@@ -0,0 +1,53 @@
+#ifndef UNSUPPORTED
+static void do_edge(void *data, struct taskinfo *task, int r1, int r2)
+{
+    struct filter *f = (struct filter *) data;
+    int y;
+    unsigned int *pixels = f->image->palette->pixels;
+    register unsigned int black = f->image->palette->pixels[0];
+    register cpixel_t *output, *end;
+    register spixel_t *up, *down, *input;
+
+    for (y = r1; y < r2; y++) {
+	output = p_add(((cpixel_t *) f->image->currlines[y]), 1);
+	input = ((spixel_t *) f->childimage->currlines[y]) + 1;
+
+	if (y != 0)
+	    up = ((spixel_t *) f->childimage->currlines[y - 1]) + 1;
+	else
+	    up = ((spixel_t *) f->childimage->currlines[y]) + 1;
+
+	if (y != f->image->height - 1)
+	    down = ((spixel_t *) f->childimage->currlines[y + 1]) + 1;
+	else
+	    down = ((spixel_t *) f->childimage->currlines[y]) + 1;
+
+	end =
+	    p_add(((cpixel_t *) f->image->currlines[y]),
+		  f->image->width - 1);
+	p_setp(output, -1, 0);
+	p_setp(output, f->image->width - 2, 0);
+
+	while (output < end) {
+	    if (input[0] > up[0] || input[0] > down[0]) {
+		p_set(output, pixels[input[0]]);
+	    } else if (input[0] != input[1]) {
+		if (input[0] < input[1]) {
+		    p_set(output, black);
+		    p_inc(output, 1);
+		    input++;
+		    up++;
+		    down++;
+		}
+		p_set(output, pixels[input[0]]);
+	    } else
+		p_set(output, black);
+	    p_inc(output, 1);
+	    input++;
+	    up++;
+	    down++;
+	}
+    }
+}
+#endif
+#undef do_edge
--
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