| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkBlurMaskFilter_DEFINED |
| #define SkBlurMaskFilter_DEFINED |
| |
| // we include this since our callers will need to at least be able to ref/unref |
| #include "SkMaskFilter.h" |
| #include "SkScalar.h" |
| #include "SkBlurTypes.h" |
| |
| class SK_API SkBlurMaskFilter { |
| public: |
| /** |
| * If radius > 0, return the corresponding sigma, else return 0. Use this to convert from the |
| * (legacy) idea of specify the blur "radius" to the standard notion of specifying its sigma. |
| */ |
| static SkScalar ConvertRadiusToSigma(SkScalar radius); |
| |
| enum BlurFlags { |
| kNone_BlurFlag = 0x00, |
| /** The blur layer's radius is not affected by transforms */ |
| kIgnoreTransform_BlurFlag = 0x01, |
| /** Use a smother, higher qulity blur algorithm */ |
| kHighQuality_BlurFlag = 0x02, |
| /** mask for all blur flags */ |
| kAll_BlurFlag = 0x03 |
| }; |
| |
| /** Create a blur maskfilter. |
| * @param style The SkBlurStyle to use |
| * @param sigma Standard deviation of the Gaussian blur to apply. Must be > 0. |
| * @param occluder The rect for which no pixels need be drawn (b.c. it will be overdrawn |
| * with some opaque object. This is just a hint which backends are free to |
| * ignore. |
| * @param flags Flags to use - defaults to none |
| * @return The new blur maskfilter |
| */ |
| static sk_sp<SkMaskFilter> Make(SkBlurStyle style, SkScalar sigma, |
| const SkRect& occluder, uint32_t flags = kNone_BlurFlag); |
| |
| static sk_sp<SkMaskFilter> Make(SkBlurStyle style, SkScalar sigma, |
| uint32_t flags = kNone_BlurFlag) { |
| return Make(style, sigma, SkRect::MakeEmpty(), flags); |
| } |
| |
| static const int kMaxDivisions = 6; |
| |
| // This method computes all the parameters for drawing a partially occluded nine-patched |
| // blurred rrect mask: |
| // rrectToDraw - the integerized rrect to draw in the mask |
| // widthHeight - how large to make the mask (rrectToDraw will be centered in this coord sys) |
| // rectXs, rectYs - the x & y coordinates of the covering geometry lattice |
| // texXs, texYs - the texture coordinate at each point in rectXs & rectYs |
| // numXs, numYs - number of coordinates in the x & y directions |
| // skipMask - bit mask that contains a 1-bit whenever one of the cells is occluded |
| // It returns true if 'devRRect' is nine-patchable |
| static bool ComputeBlurredRRectParams(const SkRRect& srcRRect, const SkRRect& devRRect, |
| const SkRect& occluder, |
| SkScalar sigma, SkScalar xformedSigma, |
| SkRRect* rrectToDraw, |
| SkISize* widthHeight, |
| SkScalar rectXs[kMaxDivisions], |
| SkScalar rectYs[kMaxDivisions], |
| SkScalar texXs[kMaxDivisions], |
| SkScalar texYs[kMaxDivisions], |
| int* numXs, int* numYs, uint32_t* skipMask); |
| |
| SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() |
| |
| private: |
| SkBlurMaskFilter(); // can't be instantiated |
| }; |
| |
| #endif |