Add pinned versions of *ToFixed.

tests/MathTest.cpp

Index: tests/MathTest.cpp
diff --git a/tests/MathTest.cpp b/tests/MathTest.cpp
index 580cd941fa926bc215165fb30daed5552995501a..9343277f8d8626b471839a1a054fd24896aa957d 100644
--- a/tests/MathTest.cpp
+++ b/tests/MathTest.cpp
@@ -5,6 +5,8 @@
  * found in the LICENSE file.
  */
 
+#include "float.h"
+
 #include "SkColorPriv.h"
 #include "SkEndian.h"
 #include "SkFixed.h"
@@ -697,3 +699,41 @@ DEF_TEST(divmod_s32, r) {
 DEF_TEST(divmod_s64, r) {
     test_divmod<int64_t>(r);
 }
+
+DEF_TEST(PinToFixed, reporter) {
+    // double
+    REPORTER_ASSERT(reporter, 0 == SkDoublePinToFixed(0.0));
+    REPORTER_ASSERT(reporter, 0x10000 == SkDoublePinToFixed(1.0));
+    REPORTER_ASSERT(reporter, 0x7FFFFFFE == SkDoublePinToFixed(32767.999984741));
+    REPORTER_ASSERT(reporter, 0x7FFFFFFF == SkDoublePinToFixed(32767.999984742));
+    REPORTER_ASSERT(reporter, 0x7FFFFFFF == SkDoublePinToFixed(32767.999999999));
+    REPORTER_ASSERT(reporter, 0x7FFFFFFF == SkDoublePinToFixed(32768.0));
+    REPORTER_ASSERT(reporter, 0x7FFFFFFF == SkDoublePinToFixed(5e10));
+    REPORTER_ASSERT(reporter, 0x7FFFFFFF == SkDoublePinToFixed(DBL_MAX));
+    REPORTER_ASSERT(reporter, -0x10000 == SkDoublePinToFixed(-1.0));
+    // SK_FixedMin is defined to be -SK_FixedMax.
+    REPORTER_ASSERT(reporter, -0x7FFFFFFE == SkDoublePinToFixed(-32767.999984741));
+    REPORTER_ASSERT(reporter, -0x7FFFFFFF == SkDoublePinToFixed(-32767.999984742));
+    REPORTER_ASSERT(reporter, -0x7FFFFFFF == SkDoublePinToFixed(-32767.999999999));
+    REPORTER_ASSERT(reporter, -0x7FFFFFFF == SkDoublePinToFixed(-32768.0));
+    REPORTER_ASSERT(reporter, -0x7FFFFFFF == SkDoublePinToFixed(-5e10));
+    REPORTER_ASSERT(reporter, -0x7FFFFFFF == SkDoublePinToFixed(-DBL_MAX));
+
+    // float
+    REPORTER_ASSERT(reporter, 0 == SkFloatPinToFixed(0.0f));
+    REPORTER_ASSERT(reporter, 0x10000 == SkFloatPinToFixed(1.0f));
+    // SkFixed has more precision than float near SK_FixedMax, so SkFloatPinToFixed will never
+    // produce output between 0x7FFFFF80 and 0x7FFFFFFF.
+    REPORTER_ASSERT(reporter, 0x7FFFFF80 == SkFloatPinToFixed(32767.9990f));
+    REPORTER_ASSERT(reporter, 0x7FFFFFFF == SkFloatPinToFixed(32767.9991f));
+    REPORTER_ASSERT(reporter, 0x7FFFFFFF == SkFloatPinToFixed(32768.0f));
+    REPORTER_ASSERT(reporter, 0x7FFFFFFF == SkFloatPinToFixed(5e10f));
+    REPORTER_ASSERT(reporter, 0x7FFFFFFF == SkFloatPinToFixed(FLT_MAX));
+    REPORTER_ASSERT(reporter, -0x10000 == SkFloatPinToFixed(-1.0f));
+    // SK_FixedMin is defined to be -SK_FixedMax.
+    REPORTER_ASSERT(reporter, -0x7FFFFF80 == SkFloatPinToFixed(-32767.9990f));
+    REPORTER_ASSERT(reporter, -0x7FFFFFFF == SkFloatPinToFixed(-32767.9991f));
+    REPORTER_ASSERT(reporter, -0x7FFFFFFF == SkFloatPinToFixed(-32768.0f));
+    REPORTER_ASSERT(reporter, -0x7FFFFFFF == SkFloatPinToFixed(-5e10f));
+    REPORTER_ASSERT(reporter, -0x7FFFFFFF == SkFloatPinToFixed(-FLT_MAX));
+}