reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /* libs/graphics/effects/SkBlurMaskFilter.cpp |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "SkBlurMaskFilter.h" |
| 19 | #include "SkBlurMask.h" |
| 20 | #include "SkBuffer.h" |
| 21 | #include "SkMaskFilter.h" |
| 22 | |
| 23 | class SkBlurMaskFilterImpl : public SkMaskFilter { |
| 24 | public: |
| 25 | SkBlurMaskFilterImpl(SkScalar radius, SkBlurMaskFilter::BlurStyle style); |
| 26 | |
| 27 | // overrides from SkMaskFilter |
| 28 | virtual SkMask::Format getFormat(); |
| 29 | virtual bool filterMask(SkMask* dst, const SkMask& src, const SkMatrix& matrix, SkIPoint* margin); |
| 30 | |
| 31 | // overrides from SkFlattenable |
| 32 | // This method is not exported to java. |
| 33 | virtual Factory getFactory(); |
| 34 | // This method is not exported to java. |
| 35 | virtual void flatten(SkFlattenableWriteBuffer&); |
| 36 | |
| 37 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer&); |
| 38 | |
| 39 | private: |
| 40 | SkScalar fRadius; |
| 41 | SkBlurMaskFilter::BlurStyle fBlurStyle; |
| 42 | |
| 43 | SkBlurMaskFilterImpl(SkFlattenableReadBuffer&); |
| 44 | |
| 45 | typedef SkMaskFilter INHERITED; |
| 46 | }; |
| 47 | |
| 48 | SkMaskFilter* SkBlurMaskFilter::Create(SkScalar radius, SkBlurMaskFilter::BlurStyle style) |
| 49 | { |
| 50 | if (radius <= 0 || (unsigned)style >= SkBlurMaskFilter::kBlurStyleCount) |
| 51 | return NULL; |
| 52 | |
| 53 | return SkNEW_ARGS(SkBlurMaskFilterImpl, (radius, style)); |
| 54 | } |
| 55 | |
| 56 | ///////////////////////////////////////////////////////////////////////////////////////////////////////// |
| 57 | |
| 58 | SkBlurMaskFilterImpl::SkBlurMaskFilterImpl(SkScalar radius, SkBlurMaskFilter::BlurStyle style) |
| 59 | : fRadius(radius), fBlurStyle(style) |
| 60 | { |
| 61 | #if 0 |
| 62 | fGamma = NULL; |
| 63 | if (gammaScale) |
| 64 | { |
| 65 | fGamma = new U8[256]; |
| 66 | if (gammaScale > 0) |
| 67 | SkBlurMask::BuildSqrGamma(fGamma, gammaScale); |
| 68 | else |
| 69 | SkBlurMask::BuildSqrtGamma(fGamma, -gammaScale); |
| 70 | } |
| 71 | #endif |
| 72 | SkASSERT(radius >= 0); |
| 73 | SkASSERT((unsigned)style < SkBlurMaskFilter::kBlurStyleCount); |
| 74 | } |
| 75 | |
| 76 | SkMask::Format SkBlurMaskFilterImpl::getFormat() |
| 77 | { |
| 78 | return SkMask::kA8_Format; |
| 79 | } |
| 80 | |
| 81 | bool SkBlurMaskFilterImpl::filterMask(SkMask* dst, const SkMask& src, const SkMatrix& matrix, SkIPoint* margin) |
| 82 | { |
| 83 | SkScalar radius = matrix.mapRadius(fRadius); |
| 84 | |
| 85 | if (SkBlurMask::Blur(dst, src, radius, (SkBlurMask::Style)fBlurStyle)) |
| 86 | { |
| 87 | if (margin) |
| 88 | margin->set(SkScalarCeil(radius), SkScalarCeil(radius)); |
| 89 | return true; |
| 90 | } |
| 91 | return false; |
| 92 | } |
| 93 | |
| 94 | SkFlattenable* SkBlurMaskFilterImpl::CreateProc(SkFlattenableReadBuffer& buffer) |
| 95 | { |
| 96 | return SkNEW_ARGS(SkBlurMaskFilterImpl, (buffer)); |
| 97 | } |
| 98 | |
| 99 | SkFlattenable::Factory SkBlurMaskFilterImpl::getFactory() |
| 100 | { |
| 101 | return CreateProc; |
| 102 | } |
| 103 | |
| 104 | SkBlurMaskFilterImpl::SkBlurMaskFilterImpl(SkFlattenableReadBuffer& buffer) : SkMaskFilter(buffer) |
| 105 | { |
| 106 | fRadius = buffer.readScalar(); |
| 107 | fBlurStyle = (SkBlurMaskFilter::BlurStyle)buffer.readS32(); |
| 108 | SkASSERT(fRadius >= 0); |
| 109 | SkASSERT((unsigned)fBlurStyle < SkBlurMaskFilter::kBlurStyleCount); |
| 110 | } |
| 111 | |
| 112 | void SkBlurMaskFilterImpl::flatten(SkFlattenableWriteBuffer& buffer) |
| 113 | { |
| 114 | this->INHERITED::flatten(buffer); |
| 115 | buffer.writeScalar(fRadius); |
| 116 | buffer.write32(fBlurStyle); |
| 117 | } |
| 118 | |
| 119 | /////////////////////////////////////////////////////////////////////////////// |
| 120 | |
| 121 | static SkFlattenable::Registrar gReg("SkBlurMaskFilter", |
| 122 | SkBlurMaskFilterImpl::CreateProc); |
| 123 | |