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Unified Diff: include/core/SkFloatingPoint.h

Issue 849333002: use log2(scale) to compute mip level (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 5 years, 11 months ago
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Index: include/core/SkFloatingPoint.h
diff --git a/include/core/SkFloatingPoint.h b/include/core/SkFloatingPoint.h
index 1003b80b4f1109db3730c54d0b76ede4ae865703..a6a17bc67ece9bdf16d34e536974db78925152df 100644
--- a/include/core/SkFloatingPoint.h
+++ b/include/core/SkFloatingPoint.h
@@ -91,6 +91,12 @@ static inline float sk_float_copysign(float x, float y) {
#define sk_float_log(x) logf(x)
robertphillips 2015/01/16 01:13:37 Map sk_float_log2 to log2f here?
reed1 2015/01/16 13:00:11 Done.
#endif
+// 1 / ln(2)
+#define SK_INVERSE_LN_2 1.44269504088896
+
+// log2(x) = log(x) / log(2)
+#define sk_float_log2(x) (float)(::log(x) * SK_INVERSE_LN_2)
+
#ifdef SK_BUILD_FOR_WIN
#define sk_float_isfinite(x) _finite(x)
#define sk_float_isnan(x) _isnan(x)
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