1 /* 2 * Copyright 2015 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 "gm.h" 9 #include "SkCanvas.h" 10 #include "SkBlurImageFilter.h" 11 #include "SkColorFilterImageFilter.h" 12 #include "SkModeColorFilter.h" 13 #include "SkMorphologyImageFilter.h" 14 #include "SkOffsetImageFilter.h" 15 #include "SkSurface.h" 16 17 static sk_sp<SkImage> make_image(SkCanvas* rootCanvas) { 18 SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100); 19 auto surface(rootCanvas->makeSurface(info)); 20 if (!surface) { 21 surface = SkSurface::MakeRaster(info); 22 } 23 24 SkPaint paint; 25 paint.setAntiAlias(true); 26 paint.setColor(SK_ColorRED); 27 surface->getCanvas()->drawCircle(50, 50, 50, paint); 28 return surface->makeImageSnapshot(); 29 } 30 31 static void show_image(SkCanvas* canvas, SkImage* image, sk_sp<SkImageFilter> filter) { 32 SkPaint paint; 33 paint.setStyle(SkPaint::kStroke_Style); 34 SkRect r = SkRect::MakeIWH(image->width(), image->height()).makeOutset(SK_ScalarHalf, 35 SK_ScalarHalf); 36 canvas->drawRect(r, paint); 37 38 paint.setStyle(SkPaint::kFill_Style); 39 paint.setImageFilter(filter); 40 canvas->drawImage(image, 0, 0, &paint); 41 } 42 43 typedef sk_sp<SkImageFilter> (*ImageFilterFactory)(); 44 45 // +[]{...} did not work on windows (VS) 46 // (ImageFilterFactory)[]{...} did not work on linux (gcc) 47 // hence this cast function 48 template <typename T> ImageFilterFactory IFCCast(T arg) { return arg; } 49 50 // Show the effect of localmatriximagefilter with various matrices, on various filters 51 DEF_SIMPLE_GM(localmatriximagefilter, canvas, 640, 640) { 52 sk_sp<SkImage> image0(make_image(canvas)); 53 54 const ImageFilterFactory factories[] = { 55 IFCCast([]{ return SkBlurImageFilter::Make(8, 8, nullptr); }), 56 IFCCast([]{ return SkDilateImageFilter::Make(8, 8, nullptr); }), 57 IFCCast([]{ return SkErodeImageFilter::Make(8, 8, nullptr); }), 58 IFCCast([]{ return SkOffsetImageFilter::Make(8, 8, nullptr); }), 59 }; 60 61 const SkMatrix matrices[] = { 62 SkMatrix::MakeScale(SK_ScalarHalf, SK_ScalarHalf), 63 SkMatrix::MakeScale(2, 2), 64 SkMatrix::MakeTrans(10, 10) 65 }; 66 67 const SkScalar spacer = image0->width() * 3.0f / 2; 68 69 canvas->translate(40, 40); 70 for (auto&& factory : factories) { 71 sk_sp<SkImageFilter> filter(factory()); 72 73 canvas->save(); 74 show_image(canvas, image0.get(), filter); 75 for (const auto& matrix : matrices) { 76 sk_sp<SkImageFilter> localFilter(filter->makeWithLocalMatrix(matrix)); 77 canvas->translate(spacer, 0); 78 show_image(canvas, image0.get(), std::move(localFilter)); 79 } 80 canvas->restore(); 81 canvas->translate(0, spacer); 82 } 83 } 84
