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1 | 1 |
2 /* | 2 /* |
3 * Copyright 2006 The Android Open Source Project | 3 * Copyright 2006 The Android Open Source Project |
4 * | 4 * |
5 * Use of this source code is governed by a BSD-style license that can be | 5 * Use of this source code is governed by a BSD-style license that can be |
6 * found in the LICENSE file. | 6 * found in the LICENSE file. |
7 */ | 7 */ |
8 | 8 |
9 | 9 |
10 #ifndef SkBlurMask_DEFINED | 10 #ifndef SkBlurMask_DEFINED |
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55 static bool Blur(SkMask* dst, const SkMask& src, | 55 static bool Blur(SkMask* dst, const SkMask& src, |
56 SkScalar radius, Style style, Quality quality, | 56 SkScalar radius, Style style, Quality quality, |
57 SkIPoint* margin = NULL); | 57 SkIPoint* margin = NULL); |
58 | 58 |
59 SK_ATTR_DEPRECATED("use sigma version") | 59 SK_ATTR_DEPRECATED("use sigma version") |
60 static bool BlurGroundTruth(SkMask* dst, const SkMask& src, | 60 static bool BlurGroundTruth(SkMask* dst, const SkMask& src, |
61 SkScalar radius, Style style, | 61 SkScalar radius, Style style, |
62 SkIPoint* margin = NULL); | 62 SkIPoint* margin = NULL); |
63 | 63 |
64 static SkScalar ConvertRadiusToSigma(SkScalar radius); | 64 static SkScalar ConvertRadiusToSigma(SkScalar radius); |
65 | |
66 /* Helper functions for analytic rectangle blurs */ | |
67 | |
68 /** Look up the intensity of the (one dimnensional) blurred half-plane. | |
69 @param profile The precomputed 1D blur profile; memory allocated by and
managed by | |
70 ComputeBlurProfile below. | |
71 @param loc the location to look up; The lookup will clamp invalid inputs
, but | |
72 meaningful data are available between 0 and blurred_width | |
73 @param blurred_width The width of the final, blurred rectangle | |
74 @param sharp_width The width of the original, unblurred rectangle. | |
75 */ | |
76 static uint8_t ProfileLookup(const uint8_t* profile, int loc, int blurred_wi
dth, int sharp_width); | |
77 | |
78 /** Allocate memory for and populate the profile of a 1D blurred halfplane.
The caller | |
79 must free the memory. The amount of memory allocated will be exactly 6*
sigma bytes. | |
80 @param sigma The standard deviation of the gaussian blur kernel | |
81 @param profile_out The location to store the allocated profile curve | |
82 */ | |
83 | |
84 static void ComputeBlurProfile(SkScalar sigma, uint8_t** profile_out); | |
85 | |
86 /** Compute an entire scanline of a blurred step function. This is a 1D hel
per that | |
87 will produce both the horizontal and vertical profiles of the blurry rec
tangle. | |
88 @param pixels Location to store the resulting pixel data; allocated and
managed by caller | |
89 @param profile Precomputed blur profile computed by ComputeBlurProfile a
bove. | |
90 @param width Size of the pixels array. | |
91 @param sigma Standard deviation of the gaussian blur kernel used to comp
ute the profile; | |
92 this implicitly gives the size of the pixels array. | |
93 */ | |
94 | |
95 static void ComputeBlurredScanline(uint8_t* pixels, const uint8_t* profile, | |
96 unsigned int width, SkScalar sigma); | |
97 | |
98 | |
99 | |
100 }; | 65 }; |
101 | 66 |
102 #endif | 67 #endif |
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