patch from issue 119343003
compile on 10.6, exclude failing gms
Sorry for making another CL; rebasing ToT on the old one ended up with code in a tangled mess; was easier to start over.
NOTRY=true
R=bsalomon@google.com, epoger@google.com, reed@google.com
Author: humper@google.com
Review URL: https://codereview.chromium.org/148883005
git-svn-id: http://skia.googlecode.com/svn/trunk@13238 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkBlurMask.h b/src/effects/SkBlurMask.h
index e0b8d54..f95c110 100644
--- a/src/effects/SkBlurMask.h
+++ b/src/effects/SkBlurMask.h
@@ -62,6 +62,41 @@
SkIPoint* margin = NULL);
static SkScalar ConvertRadiusToSigma(SkScalar radius);
+
+ /* Helper functions for analytic rectangle blurs */
+
+ /** Look up the intensity of the (one dimnensional) blurred half-plane.
+ @param profile The precomputed 1D blur profile; memory allocated by and managed by
+ ComputeBlurProfile below.
+ @param loc the location to look up; The lookup will clamp invalid inputs, but
+ meaningful data are available between 0 and blurred_width
+ @param blurred_width The width of the final, blurred rectangle
+ @param sharp_width The width of the original, unblurred rectangle.
+ */
+ static uint8_t ProfileLookup(const uint8_t* profile, int loc, int blurred_width, int sharp_width);
+
+ /** Allocate memory for and populate the profile of a 1D blurred halfplane. The caller
+ must free the memory. The amount of memory allocated will be exactly 6*sigma bytes.
+ @param sigma The standard deviation of the gaussian blur kernel
+ @param profile_out The location to store the allocated profile curve
+ */
+
+ static void ComputeBlurProfile(SkScalar sigma, uint8_t** profile_out);
+
+ /** Compute an entire scanline of a blurred step function. This is a 1D helper that
+ will produce both the horizontal and vertical profiles of the blurry rectangle.
+ @param pixels Location to store the resulting pixel data; allocated and managed by caller
+ @param profile Precomputed blur profile computed by ComputeBlurProfile above.
+ @param width Size of the pixels array.
+ @param sigma Standard deviation of the gaussian blur kernel used to compute the profile;
+ this implicitly gives the size of the pixels array.
+ */
+
+ static void ComputeBlurredScanline(uint8_t* pixels, const uint8_t* profile,
+ unsigned int width, SkScalar sigma);
+
+
+
};
#endif