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comparison: gfx/skia/trunk/src/effects/SkBlurMask.h
gfx/skia/trunk/src/effects/SkBlurMask.h
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| -1:000000000000 | 0:125b63a84f10 |
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| 1 | |
| 2 /* | |
| 3 * Copyright 2006 The Android Open Source Project | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 | |
| 9 | |
| 10 #ifndef SkBlurMask_DEFINED | |
| 11 #define SkBlurMask_DEFINED | |
| 12 | |
| 13 #include "SkShader.h" | |
| 14 #include "SkMask.h" | |
| 15 #include "SkRRect.h" | |
| 16 | |
| 17 class SkBlurMask { | |
| 18 public: | |
| 19 enum Style { | |
| 20 kNormal_Style, //!< fuzzy inside and outside | |
| 21 kSolid_Style, //!< solid inside, fuzzy outside | |
| 22 kOuter_Style, //!< nothing inside, fuzzy outside | |
| 23 kInner_Style, //!< fuzzy inside, nothing outside | |
| 24 | |
| 25 kStyleCount | |
| 26 }; | |
| 27 | |
| 28 enum Quality { | |
| 29 kLow_Quality, //!< box blur | |
| 30 kHigh_Quality //!< three pass box blur (similar to gaussian) | |
| 31 }; | |
| 32 | |
| 33 static bool BlurRect(SkScalar sigma, SkMask *dst, const SkRect &src, | |
| 34 Style style, | |
| 35 SkIPoint *margin = NULL, | |
| 36 SkMask::CreateMode createMode = | |
| 37 SkMask::kComputeBoundsAndRenderImage_CreateMode); | |
| 38 static bool BlurRRect(SkScalar sigma, SkMask *dst, const SkRRect &src, | |
| 39 Style style, | |
| 40 SkIPoint *margin = NULL, | |
| 41 SkMask::CreateMode createMode = | |
| 42 SkMask::kComputeBoundsAndRenderImage_CreateMode); | |
| 43 static bool BoxBlur(SkMask* dst, const SkMask& src, | |
| 44 SkScalar sigma, Style style, Quality quality, | |
| 45 SkIPoint* margin = NULL); | |
| 46 | |
| 47 // the "ground truth" blur does a gaussian convolution; it's slow | |
| 48 // but useful for comparison purposes. | |
| 49 static bool BlurGroundTruth(SkScalar sigma, SkMask* dst, const SkMask& src, | |
| 50 Style style, | |
| 51 SkIPoint* margin = NULL); | |
| 52 | |
| 53 static SkScalar ConvertRadiusToSigma(SkScalar radius); | |
| 54 | |
| 55 /* Helper functions for analytic rectangle blurs */ | |
| 56 | |
| 57 /** Look up the intensity of the (one dimnensional) blurred half-plane. | |
| 58 @param profile The precomputed 1D blur profile; memory allocated by and managed by | |
| 59 ComputeBlurProfile below. | |
| 60 @param loc the location to look up; The lookup will clamp invalid inputs, but | |
| 61 meaningful data are available between 0 and blurred_width | |
| 62 @param blurred_width The width of the final, blurred rectangle | |
| 63 @param sharp_width The width of the original, unblurred rectangle. | |
| 64 */ | |
| 65 static uint8_t ProfileLookup(const uint8_t* profile, int loc, int blurred_width, int sharp_width); | |
| 66 | |
| 67 /** Allocate memory for and populate the profile of a 1D blurred halfplane. The caller | |
| 68 must free the memory. The amount of memory allocated will be exactly 6*sigma bytes. | |
| 69 @param sigma The standard deviation of the gaussian blur kernel | |
| 70 @param profile_out The location to store the allocated profile curve | |
| 71 */ | |
| 72 | |
| 73 static void ComputeBlurProfile(SkScalar sigma, uint8_t** profile_out); | |
| 74 | |
| 75 /** Compute an entire scanline of a blurred step function. This is a 1D helper that | |
| 76 will produce both the horizontal and vertical profiles of the blurry rectangle. | |
| 77 @param pixels Location to store the resulting pixel data; allocated and managed by caller | |
| 78 @param profile Precomputed blur profile computed by ComputeBlurProfile above. | |
| 79 @param width Size of the pixels array. | |
| 80 @param sigma Standard deviation of the gaussian blur kernel used to compute the profile; | |
| 81 this implicitly gives the size of the pixels array. | |
| 82 */ | |
| 83 | |
| 84 static void ComputeBlurredScanline(uint8_t* pixels, const uint8_t* profile, | |
| 85 unsigned int width, SkScalar sigma); | |
| 86 | |
| 87 | |
| 88 | |
| 89 }; | |
| 90 | |
| 91 #endif |
