1 /* 2 * Copyright 2014 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 "SkMatrixImageFilter.h" 9 10 #include "SkCanvas.h" 11 #include "SkColorSpaceXformer.h" 12 #include "SkImageFilterPriv.h" 13 #include "SkReadBuffer.h" 14 #include "SkSpecialImage.h" 15 #include "SkSpecialSurface.h" 16 #include "SkWriteBuffer.h" 17 #include "SkRect.h" 18 19 SkMatrixImageFilter::SkMatrixImageFilter(const SkMatrix& transform, 20 SkFilterQuality filterQuality, 21 sk_sp<SkImageFilter> input) 22 : INHERITED(&input, 1, nullptr) 23 , fTransform(transform) 24 , fFilterQuality(filterQuality) { 25 } 26 27 sk_sp<SkImageFilter> SkMatrixImageFilter::Make(const SkMatrix& transform, 28 SkFilterQuality filterQuality, 29 sk_sp<SkImageFilter> input) { 30 return sk_sp<SkImageFilter>(new SkMatrixImageFilter(transform, 31 filterQuality, 32 std::move(input))); 33 } 34 35 sk_sp<SkFlattenable> SkMatrixImageFilter::CreateProc(SkReadBuffer& buffer) { 36 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); 37 SkMatrix matrix; 38 buffer.readMatrix(&matrix); 39 40 return Make(matrix, buffer.read32LE(kLast_SkFilterQuality), common.getInput(0)); 41 } 42 43 void SkMatrixImageFilter::flatten(SkWriteBuffer& buffer) const { 44 this->INHERITED::flatten(buffer); 45 buffer.writeMatrix(fTransform); 46 buffer.writeInt(fFilterQuality); 47 } 48 49 sk_sp<SkSpecialImage> SkMatrixImageFilter::onFilterImage(SkSpecialImage* source, 50 const Context& ctx, 51 SkIPoint* offset) const { 52 53 SkIPoint inputOffset = SkIPoint::Make(0, 0); 54 sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset)); 55 if (!input) { 56 return nullptr; 57 } 58 59 SkMatrix matrix; 60 if (!ctx.ctm().invert(&matrix)) { 61 return nullptr; 62 } 63 matrix.postConcat(fTransform); 64 matrix.postConcat(ctx.ctm()); 65 66 const SkIRect srcBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(), 67 input->width(), input->height()); 68 const SkRect srcRect = SkRect::Make(srcBounds); 69 70 SkRect dstRect; 71 matrix.mapRect(&dstRect, srcRect); 72 SkIRect dstBounds; 73 dstRect.roundOut(&dstBounds); 74 75 sk_sp<SkSpecialSurface> surf(input->makeSurface(ctx.outputProperties(), dstBounds.size())); 76 if (!surf) { 77 return nullptr; 78 } 79 80 SkCanvas* canvas = surf->getCanvas(); 81 SkASSERT(canvas); 82 83 canvas->clear(0x0); 84 85 canvas->translate(-SkIntToScalar(dstBounds.x()), -SkIntToScalar(dstBounds.y())); 86 canvas->concat(matrix); 87 88 SkPaint paint; 89 paint.setAntiAlias(true); 90 paint.setBlendMode(SkBlendMode::kSrc); 91 paint.setFilterQuality(fFilterQuality); 92 93 input->draw(canvas, srcRect.x(), srcRect.y(), &paint); 94 95 offset->fX = dstBounds.fLeft; 96 offset->fY = dstBounds.fTop; 97 return surf->makeImageSnapshot(); 98 } 99 100 sk_sp<SkImageFilter> SkMatrixImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const { 101 SkASSERT(1 == this->countInputs()); 102 auto input = xformer->apply(this->getInput(0)); 103 if (input.get() != this->getInput(0)) { 104 return SkMatrixImageFilter::Make(fTransform, fFilterQuality, std::move(input)); 105 } 106 return this->refMe(); 107 } 108 109 SkRect SkMatrixImageFilter::computeFastBounds(const SkRect& src) const { 110 SkRect bounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src) : src; 111 SkRect dst; 112 fTransform.mapRect(&dst, bounds); 113 return dst; 114 } 115 116 SkIRect SkMatrixImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm, 117 MapDirection direction) const { 118 SkMatrix matrix; 119 if (!ctm.invert(&matrix)) { 120 return src; 121 } 122 if (kForward_MapDirection == direction) { 123 matrix.postConcat(fTransform); 124 } else { 125 SkMatrix transformInverse; 126 if (!fTransform.invert(&transformInverse)) { 127 return src; 128 } 129 matrix.postConcat(transformInverse); 130 } 131 matrix.postConcat(ctm); 132 SkRect floatBounds; 133 matrix.mapRect(&floatBounds, SkRect::Make(src)); 134 return floatBounds.roundOut(); 135 } 136 137 #ifndef SK_IGNORE_TO_STRING 138 void SkMatrixImageFilter::toString(SkString* str) const { 139 str->appendf("SkMatrixImageFilter: ("); 140 141 str->appendf("transform: (%f %f %f %f %f %f %f %f %f)", 142 fTransform[SkMatrix::kMScaleX], 143 fTransform[SkMatrix::kMSkewX], 144 fTransform[SkMatrix::kMTransX], 145 fTransform[SkMatrix::kMSkewY], 146 fTransform[SkMatrix::kMScaleY], 147 fTransform[SkMatrix::kMTransY], 148 fTransform[SkMatrix::kMPersp0], 149 fTransform[SkMatrix::kMPersp1], 150 fTransform[SkMatrix::kMPersp2]); 151 152 str->append("<dt>FilterLevel:</dt><dd>"); 153 static const char* gFilterLevelStrings[] = { "None", "Low", "Medium", "High" }; 154 str->append(gFilterLevelStrings[fFilterQuality]); 155 str->append("</dd>"); 156 157 str->appendf(")"); 158 } 159 #endif 160