Cap scales used for tessellation with minimum and maximum
bug:15615144
Change-Id: I3e833864af3a7b34e444bd13db34b6c90496a8b6
diff --git a/libs/hwui/utils/MathUtils.h b/libs/hwui/utils/MathUtils.h
index 66bc127..6fb0411 100644
--- a/libs/hwui/utils/MathUtils.h
+++ b/libs/hwui/utils/MathUtils.h
@@ -35,6 +35,9 @@
return value >= NON_ZERO_EPSILON;
}
+ /**
+ * Clamps alpha value, and snaps when very near 0 or 1
+ */
inline static float clampAlpha(float alpha) {
if (alpha <= ALPHA_EPSILON) {
return 0;
@@ -45,6 +48,20 @@
}
}
+ /*
+ * Clamps positive tessellation scale values
+ */
+ inline static float clampTessellationScale(float scale) {
+ const float MIN_SCALE = 0.0001;
+ const float MAX_SCALE = 1e10;
+ if (scale < MIN_SCALE) {
+ return MIN_SCALE;
+ } else if (scale > MAX_SCALE) {
+ return MAX_SCALE;
+ }
+ return scale;
+ }
+
inline static bool areEqual(float valueA, float valueB) {
return isZero(valueA - valueB);
}