+/**
+ * Computes numer1 * numer2 / denom in full 64 intermediate precision.
+ * It is an error for denom to be 0. There is no special handling if
+ * the result overflows 32bits.
+ */
+static inline int32_t SkMulDiv(int32_t numer1, int32_t numer2, int32_t denom) {
+ SkASSERT(denom);
+
+ int64_t tmp = sk_64_mul(numer1, numer2) / denom;
+ return sk_64_asS32(tmp);
+}
+
+/**
+ * Computes (numer1 << shift) / denom in full 64 intermediate precision.
+ * It is an error for denom to be 0. There is no special handling if
+ * the result overflows 32bits.
+ */
+int32_t SkDivBits(int32_t numer, int32_t denom, int shift);
+
+/**
+ * Return the integer square root of value, with a bias of bitBias
+ */
+int32_t SkSqrtBits(int32_t value, int bitBias);
+
+/** Return the integer square root of n, treated as a SkFixed (16.16)
+ */
+#define SkSqrt32(n) SkSqrtBits(n, 15)
+