2 * Copyright 2015 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
11 #include "SkSurface.h"
14 class ImageScaleAlignedGM : public skiagm::GM {
16 void onOnceBeforeDraw() override {
17 const SkVector vectors[] = { { 1, 0 }, { 0, 1 } };
19 for (size_t i = 0; i < SK_ARRAY_COUNT(vectors); ++i) {
20 auto& set = fSets.push_back();
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;
32 SkString onShortName() override {
33 return SkString("image_scale_aligned");
36 SkISize onISize() override {
37 return SkISize::Make(580, 780);
40 void onDraw(SkCanvas* canvas) override {
45 {{ 10, 10 }, { 1, 1 }},
46 {{ 300.5f, 10 }, { 1, 1 }},
47 {{ 10, 200.5f }, { 1, 1 }},
48 {{ 300.5f, 200.5f }, { 1, 1 }},
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 }},
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());
66 SkSTArray<3, sk_sp<SkImage>, true> fImages;
67 SkSTArray<3, SkScalar> fScales;
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));
76 auto surface(SkSurface::MakeRasterN32Premul(kSegLen, kSegLen));
77 surface->getCanvas()->clear(SK_ColorTRANSPARENT);
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);
86 paint.setColor(SK_ColorBLACK);
87 surface->getCanvas()->drawLine(start, end, paint);
90 paint.setColor(color);
91 const SkPoint pts[] = { start, end };
92 surface->getCanvas()->drawPoints(SkCanvas::kPoints_PointMode, 2, pts, paint);
94 return surface->makeImageSnapshot();
97 void drawSets(SkCanvas* canvas) const {
98 SkAutoCanvasRestore acr(canvas, true);
100 const SkFilterQuality filters[] = {
101 kNone_SkFilterQuality,
102 kLow_SkFilterQuality,
103 kMedium_SkFilterQuality,
104 kHigh_SkFilterQuality
106 const bool AAs[] = { false, true };
109 for (int i = 0; i < fSets.count(); ++i) {
110 auto& set = fSets[i];
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());
121 canvas->translate(lastPt.x() + kSegLen,
122 - SkIntToScalar(kSegLen + 4) * SK_ARRAY_COUNT(filters) * SK_ARRAY_COUNT(AAs));
126 SkPoint drawSet(SkCanvas* canvas, const ImageSet& set, const SkPaint& paint) const {
127 SkASSERT(set.fImages.count() == set.fScales.count());
129 SkPoint pt = SkPoint::Make(0, 0);
130 for (int i = 0; i < set.fImages.count(); ++i) {
131 auto& img = set.fImages[i];
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()));
137 canvas->drawImageRect(img.get(), dst, &paint);
138 pt.offset(dst.width() * set.fVector.x(), dst.height() * set.fVector.y());
144 static constexpr unsigned kSegLen = 15;
145 static constexpr unsigned kStretchFactor = 4;
146 SkSTArray<2, ImageSet> fSets;
148 typedef GM INHERITED;
151 DEF_GM(return new ImageScaleAlignedGM();)