1 /* 2 * Copyright 2006 The Android Open Source Project 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "SkEmbossMaskFilter.h" 9 #include "SkBlurMaskFilter.h" 10 #include "SkBlurMask.h" 11 #include "SkColorPriv.h" 12 #include "SkEmbossMask.h" 13 #include "SkReadBuffer.h" 14 #include "SkWriteBuffer.h" 15 #include "SkString.h" 16 17 static void normalize3(SkScalar dst[3], const SkScalar src[3]) { 18 SkScalar mag = SkScalarSquare(src[0]) + SkScalarSquare(src[1]) + SkScalarSquare(src[2]); 19 SkScalar scale = SkScalarInvert(SkScalarSqrt(mag)); 20 21 for (int i = 0; i < 3; i++) { 22 dst[i] = src[i] * scale; 23 } 24 } 25 26 sk_sp<SkMaskFilter> SkEmbossMaskFilter::Make(SkScalar blurSigma, const Light& light) { 27 if (!SkScalarIsFinite(blurSigma) || blurSigma <= 0) { 28 return nullptr; 29 } 30 31 Light newLight = light; 32 normalize3(newLight.fDirection, light.fDirection); 33 if (!SkScalarsAreFinite(newLight.fDirection, 3)) { 34 return nullptr; 35 } 36 37 return sk_sp<SkMaskFilter>(new SkEmbossMaskFilter(blurSigma, newLight)); 38 } 39 40 #ifdef SK_SUPPORT_LEGACY_EMBOSSMASKFILTER 41 sk_sp<SkMaskFilter> SkBlurMaskFilter::MakeEmboss(SkScalar blurSigma, const SkScalar direction[3], 42 SkScalar ambient, SkScalar specular) { 43 if (direction == nullptr) { 44 return nullptr; 45 } 46 47 SkEmbossMaskFilter::Light light; 48 49 memcpy(light.fDirection, direction, sizeof(light.fDirection)); 50 // ambient should be 0...1 as a scalar 51 light.fAmbient = SkUnitScalarClampToByte(ambient); 52 // specular should be 0..15.99 as a scalar 53 static const SkScalar kSpecularMultiplier = SkIntToScalar(255) / 16; 54 light.fSpecular = static_cast<U8CPU>(SkScalarPin(specular, 0, 16) * kSpecularMultiplier + 0.5); 55 56 return SkEmbossMaskFilter::Make(blurSigma, light); 57 } 58 #endif 59 60 /////////////////////////////////////////////////////////////////////////////// 61 62 SkEmbossMaskFilter::SkEmbossMaskFilter(SkScalar blurSigma, const Light& light) 63 : fLight(light), fBlurSigma(blurSigma) 64 { 65 SkASSERT(fBlurSigma > 0); 66 SkASSERT(SkScalarsAreFinite(fLight.fDirection, 3)); 67 } 68 69 SkMask::Format SkEmbossMaskFilter::getFormat() const { 70 return SkMask::k3D_Format; 71 } 72 73 bool SkEmbossMaskFilter::filterMask(SkMask* dst, const SkMask& src, 74 const SkMatrix& matrix, SkIPoint* margin) const { 75 SkScalar sigma = matrix.mapRadius(fBlurSigma); 76 77 if (!SkBlurMask::BoxBlur(dst, src, sigma, kInner_SkBlurStyle, kLow_SkBlurQuality)) { 78 return false; 79 } 80 81 dst->fFormat = SkMask::k3D_Format; 82 if (margin) { 83 margin->set(SkScalarCeilToInt(3*sigma), SkScalarCeilToInt(3*sigma)); 84 } 85 86 if (src.fImage == nullptr) { 87 return true; 88 } 89 90 // create a larger buffer for the other two channels (should force fBlur to do this for us) 91 92 { 93 uint8_t* alphaPlane = dst->fImage; 94 size_t planeSize = dst->computeImageSize(); 95 if (0 == planeSize) { 96 return false; // too big to allocate, abort 97 } 98 dst->fImage = SkMask::AllocImage(planeSize * 3); 99 memcpy(dst->fImage, alphaPlane, planeSize); 100 SkMask::FreeImage(alphaPlane); 101 } 102 103 // run the light direction through the matrix... 104 Light light = fLight; 105 matrix.mapVectors((SkVector*)(void*)light.fDirection, 106 (SkVector*)(void*)fLight.fDirection, 1); 107 108 // now restore the length of the XY component 109 // cast to SkVector so we can call setLength (this double cast silences alias warnings) 110 SkVector* vec = (SkVector*)(void*)light.fDirection; 111 vec->setLength(light.fDirection[0], 112 light.fDirection[1], 113 SkPoint::Length(fLight.fDirection[0], fLight.fDirection[1])); 114 115 SkEmbossMask::Emboss(dst, light); 116 117 // restore original alpha 118 memcpy(dst->fImage, src.fImage, src.computeImageSize()); 119 120 return true; 121 } 122 123 sk_sp<SkFlattenable> SkEmbossMaskFilter::CreateProc(SkReadBuffer& buffer) { 124 Light light; 125 if (buffer.readByteArray(&light, sizeof(Light))) { 126 light.fPad = 0; // for the font-cache lookup to be clean 127 const SkScalar sigma = buffer.readScalar(); 128 return Make(sigma, light); 129 } 130 return nullptr; 131 } 132 133 void SkEmbossMaskFilter::flatten(SkWriteBuffer& buffer) const { 134 Light tmpLight = fLight; 135 tmpLight.fPad = 0; // for the font-cache lookup to be clean 136 buffer.writeByteArray(&tmpLight, sizeof(tmpLight)); 137 buffer.writeScalar(fBlurSigma); 138 } 139 140 #ifndef SK_IGNORE_TO_STRING 141 void SkEmbossMaskFilter::toString(SkString* str) const { 142 str->append("SkEmbossMaskFilter: ("); 143 144 str->append("direction: ("); 145 str->appendScalar(fLight.fDirection[0]); 146 str->append(", "); 147 str->appendScalar(fLight.fDirection[1]); 148 str->append(", "); 149 str->appendScalar(fLight.fDirection[2]); 150 str->append(") "); 151 152 str->appendf("ambient: %d specular: %d ", 153 fLight.fAmbient, fLight.fSpecular); 154 155 str->append("blurSigma: "); 156 str->appendScalar(fBlurSigma); 157 str->append(")"); 158 } 159 #endif 160
