Fix jumpstitch output

I noticed that your thumbnailer shows jump stitches yielding some ugly
thread lines in some cases.

I have attached a patch which solves this problem. Feel free to use it,
modify it, whatever.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 8 insertions, 5 deletions

diff --git a/cairo.c b/cairo.c
index c7d6565..881b144 100644
--- a/cairo.c
+++ b/cairo.c
@@ -35,7 +35,8 @@ void output_cairo(struct pes *pes, const char *filename, int size, double densit
 
 		for (i = 1; i < block->nr_stitches; i++) {
 			++stitch;
-			cairo_line_to(cr, X(stitch), Y(stitch));
+			if(!stitch->jumpstitch) cairo_line_to(cr, X(stitch), Y(stitch));
+			else cairo_move_to(cr, X(stitch), Y(stitch));
 		}
 		cairo_set_line_width(cr, scale * density);
 		cairo_set_line_cap(cr, CAIRO_LINE_CAP_ROUND);
diff --git a/pes.c b/pes.c
index d0e858c..18f90a8 100644
--- a/pes.c
+++ b/pes.c
@@ -169,7 +169,7 @@ static struct pes_block *new_block(struct pes *pes)
 	return block;
 }
 
-static int add_stitch(struct pes *pes, int x, int y)
+static int add_stitch(struct pes *pes, int x, int y, int jumpstitch)
 {
 	struct pes_block *block = pes->last;
 	struct stitch *stitch = block->stitch;
@@ -195,6 +195,7 @@ static int add_stitch(struct pes *pes, int x, int y)
 	}
 	stitch[nr_stitches].x = x;
 	stitch[nr_stitches].y = y;
+	stitch[nr_stitches].jumpstitch = jumpstitch;
 	block->nr_stitches = nr_stitches+1;
 	return 0;
 }
@@ -213,7 +214,7 @@ static int parse_pes_stitches(struct region *region, unsigned int pec, struct pe
 	block = new_block(pes);
 
 	while (p < end) {
-		int val1 = p[0], val2 = p[1];
+		int val1 = p[0], val2 = p[1], jumpstitch = 0;
 		p += 2;
 		if (val1 == 255 && !val2)
 			return 0;
@@ -234,6 +235,7 @@ static int parse_pes_stitches(struct region *region, unsigned int pec, struct pe
 			if (val1 & 2048)
 				val1 -= 4096;
 			val2 = *p++;
+			jumpstitch = 1;
 		} else {
 			if (val1 & 64)
 				val1 -= 128;
@@ -255,7 +257,7 @@ static int parse_pes_stitches(struct region *region, unsigned int pec, struct pe
 		oldx = val1;
 		oldy = val2;
 
-		if (add_stitch(pes, val1, val2))
+		if (add_stitch(pes, val1, val2, jumpstitch))
 			return -1;
 	}
 	return 0;
diff --git a/pes.h b/pes.h
index 97578a4..b132773 100644
--- a/pes.h
+++ b/pes.h
@@ -12,7 +12,7 @@ struct color {
 };
 
 struct stitch {
-	int x, y;
+	int x, y, jumpstitch;
 };
 
 struct pes_block {