1 /* 2 * Copyright 2016 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/gm.h" 9 #include "include/core/SkBitmap.h" 10 #include "include/core/SkCanvas.h" 11 #include "include/core/SkColor.h" 12 #include "include/core/SkColorPriv.h" 13 #include "include/core/SkImageInfo.h" 14 #include "include/core/SkPaint.h" 15 #include "include/core/SkPixmap.h" 16 #include "include/core/SkRect.h" 17 #include "include/core/SkRefCnt.h" 18 #include "include/core/SkScalar.h" 19 #include "include/core/SkShader.h" 20 #include "include/core/SkSize.h" 21 #include "include/core/SkString.h" 22 #include "include/core/SkTileMode.h" 23 #include "src/core/SkMipmap.h" 24 #include "src/core/SkMipmapBuilder.h" 25 #include "tools/DecodeUtils.h" 26 #include "tools/Resources.h" 27 #include "tools/ToolUtils.h" 28 29 #include <math.h> 30 31 class ShowMipLevels3 : public skiagm::GM { 32 sk_sp<SkImage> fImg; 33 getName() const34 SkString getName() const override { return SkString("showmiplevels_explicit"); } 35 getISize()36 SkISize getISize() override { return {1130, 970}; } 37 onOnceBeforeDraw()38 void onOnceBeforeDraw() override { 39 fImg = ToolUtils::GetResourceAsImage("images/ship.png"); 40 fImg = fImg->makeRasterImage(); // makeWithMips only works on raster for now 41 42 const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE }; 43 44 SkMipmapBuilder builder(fImg->imageInfo()); 45 for (int i = 0; i < builder.countLevels(); ++i) { 46 auto surf = SkSurfaces::WrapPixels(builder.level(i)); 47 surf->getCanvas()->drawColor(colors[i % std::size(colors)]); 48 } 49 fImg = builder.attachTo(fImg); 50 } 51 onDraw(SkCanvas * canvas,SkString *)52 DrawResult onDraw(SkCanvas* canvas, SkString*) override { 53 canvas->drawColor(0xFFDDDDDD); 54 55 canvas->translate(10, 10); 56 for (auto mm : {SkMipmapMode::kNone, SkMipmapMode::kNearest, SkMipmapMode::kLinear}) { 57 for (auto fm : {SkFilterMode::kNearest, SkFilterMode::kLinear}) { 58 canvas->translate(0, draw_downscaling(canvas, {fm, mm})); 59 } 60 } 61 return DrawResult::kOk; 62 } 63 64 private: draw_downscaling(SkCanvas * canvas,SkSamplingOptions sampling)65 SkScalar draw_downscaling(SkCanvas* canvas, SkSamplingOptions sampling) { 66 SkAutoCanvasRestore acr(canvas, true); 67 68 SkPaint paint; 69 SkRect r = {0, 0, 150, 150}; 70 for (float scale = 1; scale >= 0.1f; scale *= 0.7f) { 71 SkMatrix matrix = SkMatrix::Scale(scale, scale); 72 paint.setShader(fImg->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, 73 sampling, &matrix)); 74 canvas->drawRect(r, paint); 75 canvas->translate(r.width() + 10, 0); 76 } 77 return r.height() + 10; 78 } 79 80 using INHERITED = skiagm::GM; 81 }; 82 DEF_GM( return new ShowMipLevels3; ) 83
