Merge branch 'jrmuizel-stroking-fixes' into cairo

Conflicts:

	test/dash-caps-joins-ps-argb32-ref.png
	test/degenerate-path-ps-argb32-ref.png
	test/degenerate-path.c

ROADMAP

@@ -39,6 +39,7 @@ cairo-1.2.4 (August 21, 2006): Fix build bugs with 1.2.2
 ✓- source-clip-scale
  - PS/PDF Type1/Type3 problem with rotated font_matrices
 ✓- close_path behavior (T Rowley's mail)
+✓- degenerate-path dashing fixes
 
 cairo-1.4 (October 2006): Better performance
  - New tessellator

src/cairo-path-stroke.c

@@ -699,6 +699,8 @@ _cairo_stroker_line_to_dashed (void *closure, cairo_point_t *point)
     cairo_point_t *p2 = point;
     cairo_slope_t slope;
 
+    stroker->has_sub_path = stroker->dash_on;
+
     if (p1->x == p2->x && p1->y == p2->y)
 	return CAIRO_STATUS_SUCCESS;
 
@@ -758,6 +760,7 @@ _cairo_stroker_line_to_dashed (void *closure, cairo_point_t *point)
 			    return status;
 		    }
 		}
+		stroker->has_sub_path = TRUE;
 	    }
 	    if (remain) {
 		/*

test/dash-caps-joins.c

@@ -41,7 +41,7 @@ cairo_test_t test = {
     "dash-caps-joins",
     "Test caps and joins when dashing",
     3 * (PAD + SIZE) + PAD,
-    PAD + SIZE + PAD,
+    PAD + SIZE + PAD + SIZE + PAD,
     draw
 };
 
@@ -62,6 +62,8 @@ static cairo_test_status_t
 draw (cairo_t *cr, int width, int height)
 {
     double dash[] = {LINE_WIDTH, 1.5 * LINE_WIDTH};
+    double dash_offset = -2 * LINE_WIDTH;
+    int i;
 
     /* We draw in the default black, so paint white first. */
     cairo_save (cr);
@@ -69,29 +71,36 @@ draw (cairo_t *cr, int width, int height)
     cairo_paint (cr);
     cairo_restore (cr);
 
-    cairo_set_line_width (cr, LINE_WIDTH);
-    cairo_set_dash (cr, dash, sizeof(dash)/sizeof(dash[0]), - 2 * LINE_WIDTH);
+    for (i=0; i<2; i++) {
+	cairo_save (cr);
+	cairo_set_line_width (cr, LINE_WIDTH);
+	cairo_set_dash (cr, dash, sizeof(dash)/sizeof(dash[0]), dash_offset);
 
-    cairo_translate (cr, PAD, PAD);
+	cairo_translate (cr, PAD, PAD);
 
-    make_path (cr);
-    cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
-    cairo_set_line_join (cr, CAIRO_LINE_JOIN_BEVEL);
-    cairo_stroke (cr);
+	make_path (cr);
+	cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+	cairo_set_line_join (cr, CAIRO_LINE_JOIN_BEVEL);
+	cairo_stroke (cr);
 
-    cairo_translate (cr, SIZE + PAD, 0.);
+	cairo_translate (cr, SIZE + PAD, 0.);
 
-    make_path (cr);
-    cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
-    cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
-    cairo_stroke (cr);
+	make_path (cr);
+	cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+	cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
+	cairo_stroke (cr);
 
-    cairo_translate (cr, SIZE + PAD, 0.);
+	cairo_translate (cr, SIZE + PAD, 0.);
 
-    make_path (cr);
-    cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
-    cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
-    cairo_stroke (cr);
+	make_path (cr);
+	cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
+	cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
+	cairo_stroke (cr);
+
+	cairo_restore (cr);
+	cairo_translate (cr, 0., SIZE + PAD);
+	dash_offset = 0;
+    }
 
     return CAIRO_TEST_SUCCESS;
 }

test/degenerate-path.c

@@ -25,41 +25,75 @@
 
 #include "cairo-test.h"
 
-#define IMAGE_WIDTH 40
-#define IMAGE_HEIGHT 22
+#define PAD 3.0
+#define LINE_WIDTH 6.0
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
 
 static cairo_test_draw_function_t draw;
 
 cairo_test_t test = {
     "degenerate-path",
     "Tests the behaviour of degenerate paths with different cap types",
-    IMAGE_WIDTH, IMAGE_HEIGHT,
+    3*(PAD+LINE_WIDTH+PAD), 6*(LINE_WIDTH+PAD) + PAD,
     draw
 };
 
-#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
-
 static cairo_test_status_t
 draw (cairo_t *cr, int width, int height)
 {
     const cairo_line_cap_t cap[] = { CAIRO_LINE_CAP_ROUND, CAIRO_LINE_CAP_SQUARE, CAIRO_LINE_CAP_BUTT };
     size_t i;
+    double dash[] = {2, 2};
 
     cairo_set_source_rgb (cr, 1, 0, 0);
 
     for (i=0; i<ARRAY_SIZE(cap); i++) {
+	cairo_save (cr);
+
 	cairo_set_line_cap (cr, cap[i]);
 
-	cairo_set_line_width (cr, 6);
-	cairo_move_to (cr, 6, 6);
-	cairo_line_to (cr, 6, 6);
+	/* simple degenerate paths */
+	cairo_set_line_width (cr, LINE_WIDTH);
+	cairo_move_to (cr, LINE_WIDTH, LINE_WIDTH);
+	cairo_line_to (cr, LINE_WIDTH, LINE_WIDTH);
 	cairo_stroke (cr);
 
-	cairo_move_to (cr, 6, 15);
+	cairo_translate (cr, 0, 3*PAD);
+	cairo_move_to (cr, LINE_WIDTH, LINE_WIDTH);
 	cairo_close_path (cr);
 	cairo_stroke (cr);
 
-	cairo_translate (cr, 12, 0);
+	/* degenerate paths starting with dash on */
+	cairo_set_dash (cr, dash, 2, 0.);
+
+	cairo_translate (cr, 0, 3*PAD);
+	cairo_move_to (cr, LINE_WIDTH, LINE_WIDTH);
+	cairo_line_to (cr, LINE_WIDTH, LINE_WIDTH);
+	cairo_stroke (cr);
+
+	cairo_translate (cr, 0, 3*PAD);
+	cairo_move_to (cr, LINE_WIDTH, LINE_WIDTH);
+	cairo_close_path (cr);
+	cairo_stroke (cr);
+
+	/* degenerate paths starting with dash off */
+	/* these should not draw anything */
+	cairo_set_dash (cr, dash, 2, 2.);
+
+	cairo_translate (cr, 0, 3*PAD);
+	cairo_move_to (cr, LINE_WIDTH, LINE_WIDTH);
+	cairo_line_to (cr, LINE_WIDTH, LINE_WIDTH);
+	cairo_stroke (cr);
+
+	cairo_translate (cr, 0, 3*PAD);
+	cairo_move_to (cr, LINE_WIDTH, LINE_WIDTH);
+	cairo_close_path (cr);
+	cairo_stroke (cr);
+
+	cairo_restore (cr);
+
+	cairo_translate (cr, PAD+LINE_WIDTH+PAD, 0);
     }
     return CAIRO_TEST_SUCCESS;
 }