Pass the radius as a float deeper into HWUI allowing RS to generate more accurate blurs.
Also, when converting radius to an integer value snap to the appropriate integer boundaries.
bug: 10650594
Change-Id: Icca4bc17d88162bbcbc6035d4f81bd1d98a4de2d
diff --git a/libs/hwui/utils/Blur.h b/libs/hwui/utils/Blur.h
index 79aff65..b145333 100644
--- a/libs/hwui/utils/Blur.h
+++ b/libs/hwui/utils/Blur.h
@@ -27,8 +27,12 @@
public:
// If radius > 0, return the corresponding sigma, else return 0
ANDROID_API static float convertRadiusToSigma(float radius);
- // If sigma > 0.6, return the corresponding radius, else return 0
+ // If sigma > 0.5, return the corresponding radius, else return 0
ANDROID_API static float convertSigmaToRadius(float sigma);
+ // If the original radius was on an integer boundary then after the sigma to
+ // radius conversion a small rounding error may be introduced. This function
+ // accounts for that error and snaps to the appropriate integer boundary.
+ static uint32_t convertRadiusToInt(float radius);
static void generateGaussianWeights(float* weights, int32_t radius);
static void horizontal(float* weights, int32_t radius, const uint8_t* source,