Fix radii calculation code to handle large radii.

BUG=472147
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1569403002

Review URL: https://codereview.chromium.org/1569403002

2 files changed, 84 insertions, 0 deletions

diff --git a/tests/DrawPathTest.cpp b/tests/DrawPathTest.cpp
index 364a297123..e9aa4499d9 100644
--- a/tests/DrawPathTest.cpp
+++ b/tests/DrawPathTest.cpp
@@ -313,6 +313,39 @@ static void test_crbug_165432(skiatest::Reporter* reporter) {
     REPORTER_ASSERT(reporter, filteredPath.isEmpty());
 }
 
+// http://crbug.com/472147
+// This is a simplified version from the bug. RRect radii not properly scaled.
+static void test_crbug_472147_simple(skiatest::Reporter* reporter) {
+    SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(1000, 1000));
+    SkCanvas* canvas = surface->getCanvas();
+    SkPaint p;
+    SkRect r = SkRect::MakeLTRB(-246.0f, 33.0f, 848.0f, 33554464.0f);
+    SkVector radii[4] = {
+        { 13.0f, 8.0f }, { 170.0f, 2.0 }, { 256.0f, 33554430.0f }, { 120.0f, 5.0f }
+    };
+    SkRRect rr;
+    rr.setRectRadii(r, radii);
+    canvas->drawRRect(rr, p);
+}
+
+// http://crbug.com/472147
+// RRect radii not properly scaled.
+static void test_crbug_472147_actual(skiatest::Reporter* reporter) {
+    SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(1000, 1000));
+    SkCanvas* canvas = surface->getCanvas();
+    SkPaint p;
+    SkRect r = SkRect::MakeLTRB(-246.0f, 33.0f, 848.0f, 33554464.0f);
+    SkVector radii[4] = {
+        { 13.0f, 8.0f }, { 170.0f, 2.0 }, { 256.0f, 33554430.0f }, { 120.0f, 5.0f }
+    };
+    SkRRect rr;
+    rr.setRectRadii(r, radii);
+    canvas->clipRRect(rr, SkRegion::kIntersect_Op, false);
+
+    SkRect r2 = SkRect::MakeLTRB(0, 33, 1102, 33554464);
+    canvas->drawRect(r2, p);
+}
+
 DEF_TEST(DrawPath, reporter) {
     test_giantaa();
     test_bug533();
@@ -325,6 +358,8 @@ DEF_TEST(DrawPath, reporter) {
     if (false) test_crbug131181();
     test_infinite_dash(reporter);
     test_crbug_165432(reporter);
+    test_crbug_472147_simple(reporter);
+    test_crbug_472147_actual(reporter);
     test_big_aa_rect(reporter);
     test_halfway();
 }
diff --git a/tests/ScaleToSidesTest.cpp b/tests/ScaleToSidesTest.cpp
new file mode 100644
index 0000000000..60e82be529
--- /dev/null
+++ b/tests/ScaleToSidesTest.cpp
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkScaleToSides.h"
+
+#include <cfloat>
+#include "Test.h"
+
+DEF_TEST(ScaleToSides, reporter) {
+    float interestingValues[] = {
+        0.0f,
+        0.5f,
+        1.0f,
+        2.0f,
+        3.0f,
+        33.0f,
+        33554430.0f,
+        33554431.0f,
+        33554464.0f,
+        333333332.0f,
+        333333333.0f,
+        333333334.0f,
+        FLT_MAX,
+        FLT_EPSILON,
+        FLT_MIN
+    };
+
+    int numInterestingValues = (int)SK_ARRAY_COUNT(interestingValues);
+
+    for (int i = 0; i < numInterestingValues; i++) {
+        for (int j = 0; j < numInterestingValues; j++) {
+            for (int k = 0; k < numInterestingValues; k++) {
+                float radius1 = interestingValues[i];
+                float radius2 = interestingValues[j];
+                float width = interestingValues[k];
+                if (width > 0.0f) {
+                    double scale = (double)width / ((double)radius1 + (double)radius2);
+                    if (scale < 1.0) {
+                        ScaleToSides::AdjustRadii(width, scale, &radius1, &radius2);
+                    }
+                }
+            }
+        }
+    }
+}