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| 1 /* | |
| 2 * Copyright 2011 Google Inc. | |
| 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 "SkTestImageFilters.h" | |
| 9 #include "SkCanvas.h" | |
| 10 #include "SkReadBuffer.h" | |
| 11 #include "SkSpecialImage.h" | |
| 12 #include "SkSpecialSurface.h" | |
| 13 #include "SkWriteBuffer.h" | |
| 14 | |
| 15 /////////////////////////////////////////////////////////////////////////////// | |
| 16 | |
| 17 sk_sp<SkImageFilter> SkDownSampleImageFilter::Make(SkScalar scale, sk_sp<SkImage
Filter> input) { | |
| 18 if (!SkScalarIsFinite(scale)) { | |
| 19 return nullptr; | |
| 20 } | |
| 21 // we don't support scale in this range | |
| 22 if (scale > SK_Scalar1 || scale <= 0) { | |
| 23 return nullptr; | |
| 24 } | |
| 25 return sk_sp<SkImageFilter>(new SkDownSampleImageFilter(scale, std::move(inp
ut))); | |
| 26 } | |
| 27 | |
| 28 sk_sp<SkSpecialImage> SkDownSampleImageFilter::onFilterImage(SkSpecialImage* sou
rce, | |
| 29 const Context& ctx, | |
| 30 SkIPoint* offset) c
onst { | |
| 31 if (fScale > SK_Scalar1 || fScale <= 0) { | |
| 32 return nullptr; | |
| 33 } | |
| 34 | |
| 35 int dstW = SkScalarRoundToInt(source->width() * fScale); | |
| 36 int dstH = SkScalarRoundToInt(source->height() * fScale); | |
| 37 if (dstW < 1) { | |
| 38 dstW = 1; | |
| 39 } | |
| 40 if (dstH < 1) { | |
| 41 dstH = 1; | |
| 42 } | |
| 43 | |
| 44 sk_sp<SkSpecialImage> tmp; | |
| 45 | |
| 46 // downsample | |
| 47 { | |
| 48 const SkImageInfo info = SkImageInfo::MakeN32Premul(dstW, dstH); | |
| 49 | |
| 50 sk_sp<SkSpecialSurface> surf(source->makeSurface(info)); | |
| 51 if (!surf) { | |
| 52 return nullptr; | |
| 53 } | |
| 54 | |
| 55 SkCanvas* canvas = surf->getCanvas(); | |
| 56 SkASSERT(canvas); | |
| 57 | |
| 58 canvas->clear(0x0); | |
| 59 | |
| 60 SkPaint paint; | |
| 61 paint.setXfermodeMode(SkXfermode::kSrcOver_Mode); | |
| 62 paint.setFilterQuality(kLow_SkFilterQuality); | |
| 63 | |
| 64 canvas->scale(fScale, fScale); | |
| 65 source->draw(canvas, 0, 0, &paint); | |
| 66 | |
| 67 tmp = surf->makeImageSnapshot(); | |
| 68 } | |
| 69 | |
| 70 // upscale | |
| 71 { | |
| 72 const SkImageInfo info = SkImageInfo::MakeN32Premul(source->width(), sou
rce->height()); | |
| 73 | |
| 74 sk_sp<SkSpecialSurface> surf(source->makeSurface(info)); | |
| 75 if (!surf) { | |
| 76 return nullptr; | |
| 77 } | |
| 78 | |
| 79 SkCanvas* canvas = surf->getCanvas(); | |
| 80 SkASSERT(canvas); | |
| 81 | |
| 82 canvas->clear(0x0); | |
| 83 | |
| 84 SkPaint paint; | |
| 85 paint.setXfermodeMode(SkXfermode::kSrcOver_Mode); | |
| 86 | |
| 87 canvas->scale(SkScalarInvert(fScale), SkScalarInvert(fScale)); | |
| 88 tmp->draw(canvas, 0, 0, &paint); | |
| 89 | |
| 90 return surf->makeImageSnapshot(); | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 sk_sp<SkFlattenable> SkDownSampleImageFilter::CreateProc(SkReadBuffer& buffer) { | |
| 95 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); | |
| 96 return Make(buffer.readScalar(), common.getInput(0)); | |
| 97 } | |
| 98 | |
| 99 void SkDownSampleImageFilter::flatten(SkWriteBuffer& buffer) const { | |
| 100 this->INHERITED::flatten(buffer); | |
| 101 buffer.writeScalar(fScale); | |
| 102 } | |
| 103 | |
| 104 #ifndef SK_IGNORE_TO_STRING | |
| 105 void SkDownSampleImageFilter::toString(SkString* str) const { | |
| 106 str->appendf("SkDownSampleImageFilter: ("); | |
| 107 str->append(")"); | |
| 108 } | |
| 109 #endif | |
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Chromium Code Reviews
Issue 2094083002:
remove DownSample imagefilter (Closed)
Base URL: https://skia.googlesource.com/skia.git@master