Use SDF path miplevels based on the original path's size

Should produce sharper results than arbitrary fixed sizes.
Adds a new test to pathfill GM.

Was: https://skia-review.googlesource.com/c/8328/

BUG=chromium:682918, skia:6238

Change-Id: Ia62ea5ce6b4a5ac2b8b51d06d57dc951d6c340b8
Reviewed-on: https://skia-review.googlesource.com/8384
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>

1 files changed, 52 insertions, 3 deletions

diff --git a/gm/pathfill.cpp b/gm/pathfill.cpp
index de762a9548..a36ab1f459 100644
--- a/gm/pathfill.cpp
+++ b/gm/pathfill.cpp
@@ -140,7 +140,7 @@ static SkScalar make_line(SkPath* path) {
     return SkIntToScalar(40);
 }
 
-static SkScalar make_info(SkPath* path) {
+static void make_info(SkPath* path) {
     path->moveTo(24, 4);
     path->cubicTo(12.94999980926514f,
                   4,
@@ -179,8 +179,49 @@ static SkScalar make_info(SkPath* path) {
     path->lineTo(26, 14);
     path->lineTo(26, 18);
     path->close();
+}
 
-    return SkIntToScalar(44);
+static void make_accessibility(SkPath* path) {
+    path->moveTo(12, 2);
+    path->cubicTo(13.10000038146973f,
+                  2,
+                  14,
+                  2.900000095367432f,
+                  14,
+                  4);
+    path->cubicTo(14,
+                  5.099999904632568f,
+                  13.10000038146973f,
+                  6,
+                  12,
+                  6);
+    path->cubicTo(10.89999961853027f,
+                  6,
+                  10,
+                  5.099999904632568f,
+                  10,
+                  4);
+    path->cubicTo(10,
+                  2.900000095367432f,
+                  10.89999961853027f,
+                  2,
+                  12,
+                  2);
+    path->close();
+    path->moveTo(21, 9);
+    path->lineTo(15, 9);
+    path->lineTo(15, 22);
+    path->lineTo(13, 22);
+    path->lineTo(13, 16);
+    path->lineTo(11, 16);
+    path->lineTo(11, 22);
+    path->lineTo(9, 22);
+    path->lineTo(9, 9);
+    path->lineTo(3, 9);
+    path->lineTo(3, 7);
+    path->lineTo(21, 7);
+    path->lineTo(21, 9);
+    path->close();
 }
 
 constexpr MakePathProc gProcs[] = {
@@ -202,13 +243,15 @@ class PathFillGM : public skiagm::GM {
     SkPath  fPath[N];
     SkScalar fDY[N];
     SkPath  fInfoPath;
+    SkPath  fAccessibilityPath;
 protected:
     void onOnceBeforeDraw() override {
         for (size_t i = 0; i < N; i++) {
             fDY[i] = gProcs[i](&fPath[i]);
         }
 
-        (void) make_info(&fInfoPath);
+        make_info(&fInfoPath);
+        make_accessibility(&fAccessibilityPath);
     }
 
 
@@ -229,9 +272,15 @@ protected:
             canvas->translate(SkIntToScalar(0), fDY[i]);
         }
 
+        canvas->save();
         canvas->scale(0.300000011920929f, 0.300000011920929f);
         canvas->translate(50, 50);
         canvas->drawPath(fInfoPath, paint);
+        canvas->restore();
+
+        canvas->scale(2, 2);
+        canvas->translate(5, 15);
+        canvas->drawPath(fAccessibilityPath, paint);
     }
 
 private: