Fix SDF generation for pixel-aligned paths

BUG=668550

Change-Id: Ib496db82c7391aca61b31afaeb5445260170cc49
Reviewed-on: https://skia-review.googlesource.com/5549
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>

1 files changed, 34 insertions, 5 deletions

diff --git a/gm/pathfill.cpp b/gm/pathfill.cpp
index 3496cfd04d..ae49a9dbd6 100644
--- a/gm/pathfill.cpp
+++ b/gm/pathfill.cpp
@@ -50,15 +50,15 @@ static SkScalar make_oval(SkPath* path) {
     return SkIntToScalar(30);
 }
 
-static SkScalar make_sawtooth(SkPath* path) {
+static SkScalar make_sawtooth(SkPath* path, int teeth) {
     SkScalar x = SkIntToScalar(20);
     SkScalar y = SkIntToScalar(20);
     const SkScalar x0 = x;
-    const SkScalar dx = SK_Scalar1 * 5;
-    const SkScalar dy = SK_Scalar1 * 10;
+    const SkScalar dx = SkIntToScalar(5);
+    const SkScalar dy = SkIntToScalar(10);
 
     path->moveTo(x, y);
-    for (int i = 0; i < 32; i++) {
+    for (int i = 0; i < teeth; i++) {
         x += dx;
         path->lineTo(x, y - dy);
         x += dx;
@@ -70,6 +70,33 @@ static SkScalar make_sawtooth(SkPath* path) {
     return SkIntToScalar(30);
 }
 
+static SkScalar make_sawtooth_3(SkPath* path) { return make_sawtooth(path, 3); }
+static SkScalar make_sawtooth_32(SkPath* path) { return make_sawtooth(path, 32); }
+
+static SkScalar make_house(SkPath* path) {
+    path->moveTo(21, 23);
+    path->lineTo(21, 11.534f);
+    path->lineTo(22.327f, 12.741f);
+    path->lineTo(23.673f, 11.261f);
+    path->lineTo(12, 0.648f);
+    path->lineTo(8, 4.285f);
+    path->lineTo(8, 2);
+    path->lineTo(4, 2);
+    path->lineTo(4, 7.921f);
+    path->lineTo(0.327f, 11.26f);
+    path->lineTo(1.673f, 12.74f);
+    path->lineTo(3, 11.534f);
+    path->lineTo(3, 23);
+    path->lineTo(11, 23);
+    path->lineTo(11, 18);
+    path->lineTo(13, 18);
+    path->lineTo(13, 23);
+    path->lineTo(21, 23);
+    path->close();
+    path->offset(20, 0);
+    return SkIntToScalar(30);
+}
+
 static SkScalar make_star(SkPath* path, int n) {
     const SkScalar c = SkIntToScalar(45);
     const SkScalar r = SkIntToScalar(20);
@@ -107,10 +134,12 @@ constexpr MakePathProc gProcs[] = {
     make_triangle,
     make_rect,
     make_oval,
-    make_sawtooth,
+    make_sawtooth_32,
     make_star_5,
     make_star_13,
     make_line,
+    make_house,
+    make_sawtooth_3,
 };
 
 #define N   SK_ARRAY_COUNT(gProcs)