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 10 #include "SkImage.h" 11 #include "SkSurface.h" 12 #include "SkTArray.h" 13 14 class ImageScaleAlignedGM : public skiagm::GM { 15 protected: 16 void onOnceBeforeDraw() override { 17 const SkVector vectors[] = { { 1, 0 }, { 0, 1 } }; 18 19 for (size_t i = 0; i < SK_ARRAY_COUNT(vectors); ++i) { 20 auto& set = fSets.push_back(); 21 22 set.fVector = vectors[i]; 23 set.fImages.push_back() = MakeImage(vectors[i], SK_ColorGREEN); 24 set.fScales.push_back() = 1; 25 set.fImages.push_back() = MakeImage(vectors[i], SK_ColorRED); 26 set.fScales.push_back() = kStretchFactor; 27 set.fImages.push_back() = MakeImage(vectors[i], SK_ColorGREEN); 28 set.fScales.push_back() = 1; 29 } 30 } 31 32 SkString onShortName() override { 33 return SkString("image_scale_aligned"); 34 } 35 36 SkISize onISize() override { 37 return SkISize::Make(580, 780); 38 } 39 40 void onDraw(SkCanvas* canvas) override { 41 struct { 42 SkPoint offset; 43 SkVector scale; 44 } cfgs[] = { 45 {{ 10, 10 }, { 1, 1 }}, 46 {{ 300.5f, 10 }, { 1, 1 }}, 47 {{ 10, 200.5f }, { 1, 1 }}, 48 {{ 300.5f, 200.5f }, { 1, 1 }}, 49 50 {{ 10.5f, 400.5f }, { 1, 1 }}, 51 {{ 550.5f, 400.5f }, { -1, 1 }}, 52 {{ 10.5f, 750.5f }, { 1, -1 }}, 53 {{ 550.5f, 750.5f }, { -1, -1 }}, 54 }; 55 56 for (size_t i = 0; i < SK_ARRAY_COUNT(cfgs); ++i) { 57 SkAutoCanvasRestore acr(canvas, true); 58 canvas->translate(cfgs[i].offset.x(), cfgs[i].offset.y()); 59 canvas->scale(cfgs[i].scale.x(), cfgs[i].scale.y()); 60 drawSets(canvas); 61 } 62 } 63 64 private: 65 struct ImageSet { 66 SkSTArray<3, sk_sp<SkImage>, true> fImages; 67 SkSTArray<3, SkScalar> fScales; 68 SkVector fVector; 69 }; 70 71 static sk_sp<SkImage> MakeImage(const SkVector& vec, SkColor color) { 72 const SkPoint start = SkPoint::Make(vec.y() * kSegLen / 2, vec.x() * kSegLen / 2); 73 const SkPoint end = SkPoint::Make(start.x() + vec.x() * (kSegLen - 1), 74 start.y() + vec.y() * (kSegLen - 1)); 75 76 auto surface(SkSurface::MakeRasterN32Premul(kSegLen, kSegLen)); 77 surface->getCanvas()->clear(SK_ColorTRANSPARENT); 78 79 SkPaint paint; 80 paint.setAntiAlias(true); 81 const SkRect border = SkRect::MakeIWH(kSegLen, kSegLen).makeInset(.5f, .5f); 82 paint.setColor(SK_ColorBLUE); 83 paint.setStyle(SkPaint::kStroke_Style); 84 surface->getCanvas()->drawRect(border, paint); 85 86 paint.setColor(SK_ColorBLACK); 87 surface->getCanvas()->drawLine(start.x(), start.y(), end.x(), end.y(), paint); 88 89 paint.reset(); 90 paint.setColor(color); 91 const SkPoint pts[] = { start, end }; 92 surface->getCanvas()->drawPoints(SkCanvas::kPoints_PointMode, 2, pts, paint); 93 94 return surface->makeImageSnapshot(); 95 } 96 97 void drawSets(SkCanvas* canvas) const { 98 SkAutoCanvasRestore acr(canvas, true); 99 100 const SkFilterQuality filters[] = { 101 kNone_SkFilterQuality, 102 kLow_SkFilterQuality, 103 kMedium_SkFilterQuality, 104 kHigh_SkFilterQuality 105 }; 106 const bool AAs[] = { false, true }; 107 108 SkPaint paint; 109 for (int i = 0; i < fSets.count(); ++i) { 110 auto& set = fSets[i]; 111 SkPoint lastPt; 112 for (size_t j = 0; j < SK_ARRAY_COUNT(AAs); ++j) { 113 paint.setAntiAlias(AAs[j]); 114 for (size_t k = 0; k < SK_ARRAY_COUNT(filters); ++k) { 115 paint.setFilterQuality(filters[k]); 116 lastPt = drawSet(canvas, set, paint); 117 canvas->translate((kSegLen + 4) * set.fVector.y(), 118 (kSegLen + 4) * set.fVector.x()); 119 } 120 } 121 canvas->translate(lastPt.x() + kSegLen, 122 - SkIntToScalar(kSegLen + 4) * SK_ARRAY_COUNT(filters) * SK_ARRAY_COUNT(AAs)); 123 } 124 } 125 126 SkPoint drawSet(SkCanvas* canvas, const ImageSet& set, const SkPaint& paint) const { 127 SkASSERT(set.fImages.count() == set.fScales.count()); 128 129 SkPoint pt = SkPoint::Make(0, 0); 130 for (int i = 0; i < set.fImages.count(); ++i) { 131 auto& img = set.fImages[i]; 132 const SkRect dst = 133 SkRect::MakeXYWH(pt.x(), pt.y(), 134 img->width() * (1 + (set.fScales[i] - 1) * set.fVector.x()), 135 img->height() * (1 + (set.fScales[i] - 1) * set.fVector.y())); 136 137 canvas->drawImageRect(img.get(), dst, &paint); 138 pt.offset(dst.width() * set.fVector.x(), dst.height() * set.fVector.y()); 139 } 140 141 return pt; 142 } 143 144 static constexpr unsigned kSegLen = 15; 145 static constexpr unsigned kStretchFactor = 4; 146 SkSTArray<2, ImageSet> fSets; 147 148 typedef GM INHERITED; 149 }; 150 151 DEF_GM(return new ImageScaleAlignedGM();) 152
