[stroker] Rectilinear dashing.

Extend the rectilinear stroker to handle dashes, so that for pixel-aligned
dashed strokes we completely avoid tessellation overhead.

1 files changed, 14 insertions, 4 deletions

diff --git a/src/cairo-stroke-style.c b/src/cairo-stroke-style.c
index edc4f8890..d808ad8bc 100644
--- a/src/cairo-stroke-style.c
+++ b/src/cairo-stroke-style.c
@@ -95,9 +95,19 @@ _cairo_stroke_style_max_distance_from_path (const cairo_stroke_style_t *style,
                                             const cairo_matrix_t *ctm,
                                             double *dx, double *dy)
 {
-    double style_expansion = MAX(style->line_cap == CAIRO_LINE_CAP_SQUARE ? M_SQRT1_2 : 0.5,
-                                 style->line_join == CAIRO_LINE_JOIN_MITER ? style->miter_limit : 0.5);
+    double style_expansion = 0.5;
 
-    *dx = style->line_width * style_expansion * (fabs(ctm->xx) + fabs(ctm->xy));
-    *dy = style->line_width * style_expansion * (fabs(ctm->yy) + fabs(ctm->yx));
+    if (style->line_cap == CAIRO_LINE_CAP_SQUARE)
+	style_expansion = M_SQRT1_2;
+
+    if (style->line_join == CAIRO_LINE_JOIN_MITER &&
+	style_expansion < style->miter_limit)
+    {
+	style_expansion = style->miter_limit;
+    }
+
+    style_expansion *= style->line_width;
+
+    *dx = style_expansion * (fabs (ctm->xx) + fabs (ctm->xy));
+    *dy = style_expansion * (fabs (ctm->yy) + fabs (ctm->yx));
 }