begin to wrap all float divides

Bug: skia:7607 skia:6134
Change-Id: Id126e92816bef1df1372bd531238cda9f3b36fab
Reviewed-on: https://skia-review.googlesource.com/106261
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/src/core/SkMatrix.cpp b/src/core/SkMatrix.cpp
index 9a70fbbc7d..778d77c432 100644
--- a/src/core/SkMatrix.cpp
+++ b/src/core/SkMatrix.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SkFloatBits.h"
+#include "SkMathPriv.h"
 #include "SkMatrixPriv.h"
 #include "SkNx.h"
 #include "SkPaint.h"
@@ -1363,32 +1364,32 @@ bool SkMatrix::Poly4Proc(const SkPoint srcPt[], SkMatrix* dst,
 
     /* check if abs(x2) > abs(y2) */
     if ( x2 > 0 ? y2 > 0 ? x2 > y2 : x2 > -y2 : y2 > 0 ? -x2 > y2 : x2 < y2) {
-        float denom = (x1 * y2 / x2) - y1;
+        float denom = sk_ieee_float_divide(x1 * y2, x2) - y1;
         if (checkForZero(denom)) {
             return false;
         }
         a1 = (((x0 - x1) * y2 / x2) - y0 + y1) / denom;
     } else {
-        float denom = x1 - (y1 * x2 / y2);
+        float denom = x1 - sk_ieee_float_divide(y1 * x2, y2);
         if (checkForZero(denom)) {
             return false;
         }
-        a1 = (x0 - x1 - ((y0 - y1) * x2 / y2)) / denom;
+        a1 = (x0 - x1 - sk_ieee_float_divide((y0 - y1) * x2, y2)) / denom;
     }
 
     /* check if abs(x1) > abs(y1) */
     if ( x1 > 0 ? y1 > 0 ? x1 > y1 : x1 > -y1 : y1 > 0 ? -x1 > y1 : x1 < y1) {
-        float denom = y2 - (x2 * y1 / x1);
+        float denom = y2 - sk_ieee_float_divide(x2 * y1, x1);
         if (checkForZero(denom)) {
             return false;
         }
-        a2 = (y0 - y2 - ((x0 - x2) * y1 / x1)) / denom;
+        a2 = (y0 - y2 - sk_ieee_float_divide((x0 - x2) * y1, x1)) / denom;
     } else {
-        float denom = (y2 * x1 / y1) - x2;
+        float denom = sk_ieee_float_divide(y2 * x1, y1) - x2;
         if (checkForZero(denom)) {
             return false;
         }
-        a2 = (((y0 - y2) * x1 / y1) - x0 + x2) / denom;
+        a2 = (sk_ieee_float_divide((y0 - y2) * x1, y1) - x0 + x2) / denom;
     }
 
     float invScale = SkScalarInvert(scale.fX);