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Side by Side Diff: gm/imagescalealigned.cpp

Issue 1514923002: New GM: image_scale_aligned (Closed) Base URL: https://chromium.googlesource.com/skia.git@master
Patch Set: win Created 5 years ago
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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().reset(MakeImage(vectors[i], SK_ColorGREEN));
24 set.fScales.push_back() = 1;
25 set.fImages.push_back().reset(MakeImage(vectors[i], SK_ColorRED));
26 set.fScales.push_back() = kStretchFactor;
27 set.fImages.push_back().reset(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(550, 300);
38 }
39
40 void onDraw(SkCanvas* canvas) override {
41 struct {
42 SkPoint offset;
43 SkScalar scale;
44 } cfgs[] = {
45 { { 10, 10 }, 1 },
46 { { 140.5f, 10 }, 1 },
47 { { 10, 80.5f }, 1 },
48 { { 140.5f, 80.5f }, 1 },
49
50 { { 280.49f, 10.49f }, 1 },
51 { { 410.51f, 10.49f }, 1 },
52 { { 280.49f, 80.51f }, 1 },
53 { { 410.51f, 80.51f }, 1 },
54
55 { { 10, 170 }, 1.1f },
56 { { 140.5f, 170 }, 1.1f },
57 { { 10, 240.5f }, 1.1f },
58 { { 140.5f, 240.5f }, 1.1f },
59
60 { { 280.49f, 170.49f }, 1.1f },
61 { { 410.51f, 170.49f }, 1.1f },
62 { { 280.49f, 240.51f }, 1.1f },
63 { { 410.51f, 240.51f }, 1.1f },
64 };
65
66 for (size_t i = 0; i < SK_ARRAY_COUNT(cfgs); ++i) {
67 SkAutoCanvasRestore acr(canvas, true);
68 canvas->translate(cfgs[i].offset.x(), cfgs[i].offset.y());
69 canvas->scale(cfgs[i].scale, cfgs[i].scale);
70 drawSets(canvas);
71 }
72 }
73
74 private:
75 struct ImageSet {
76 SkSTArray<3, SkAutoTUnref<SkImage>, true> fImages;
77 SkSTArray<3, SkScalar> fScales;
78 SkVector fVector;
79 };
80
81 static SkImage* MakeImage(const SkVector& vec, SkColor color) {
82 const SkPoint start = SkPoint::Make(vec.y() * kSegLen / 2, vec.x() * kSe gLen / 2);
83 const SkPoint end = SkPoint::Make(start.x() + vec.x() * (kSegLen - 1),
84 start.y() + vec.y() * (kSegLen - 1)) ;
85
86 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(kSegLen, k SegLen));
87 surface->getCanvas()->clear(SK_ColorTRANSPARENT);
88
89 SkPaint paint;
90 paint.setAntiAlias(true);
91 paint.setColor(SK_ColorBLACK);
92 surface->getCanvas()->drawLine(start.x(), start.y(), end.x(), end.y(), p aint);
93 surface->getCanvas()->drawPoint(start.x(), start.y(), color);
94 surface->getCanvas()->drawPoint(end.x(), end.y(), color);
95
96 return surface->newImageSnapshot();
97 }
98
99 void drawSets(SkCanvas* canvas) const {
100 SkAutoCanvasRestore acr(canvas, true);
101
102 const SkFilterQuality filters[] = {
103 kNone_SkFilterQuality,
104 kLow_SkFilterQuality,
105 kMedium_SkFilterQuality,
106 kHigh_SkFilterQuality
107 };
108 const bool AAs[] = { false, true };
109
110 SkPaint paint;
111 for (int i = 0; i < fSets.count(); ++i) {
112 auto& set = fSets[i];
113 SkPoint lastPt;
114 for (size_t j = 0; j < SK_ARRAY_COUNT(AAs); ++j) {
115 paint.setAntiAlias(AAs[j]);
116 for (size_t k = 0; k < SK_ARRAY_COUNT(filters); ++k) {
117 paint.setFilterQuality(filters[k]);
118 lastPt = drawSet(canvas, set, paint);
119 canvas->translate((kSegLen / 2) * set.fVector.y(),
120 (kSegLen / 2) * set.fVector.x());
121 }
122 }
123 canvas->translate(lastPt.x() + kSegLen,
124 - SkIntToScalar(kSegLen) / 2 * SK_ARRAY_COUNT(filters) * SK_ARRA Y_COUNT(AAs));
125 }
126 }
127
128 SkPoint drawSet(SkCanvas* canvas, const ImageSet& set, const SkPaint& paint) const {
129 SkASSERT(set.fImages.count() == set.fScales.count());
130
131 SkPoint pt = SkPoint::Make(0, 0);
132 for (int i = 0; i < set.fImages.count(); ++i) {
133 auto& img = set.fImages[i];
134 const SkRect dst =
135 SkRect::MakeXYWH(pt.x(), pt.y(),
136 img->width() * (1 + (set.fScales[i] - 1) * set.fVector.x()),
137 img->height() * (1 + (set.fScales[i] - 1) * set.fVector.y()) );
138
139 canvas->drawImageRect(img, dst, &paint);
140 pt.offset(dst.width() * set.fVector.x(), dst.height() * set.fVector. y());
141 }
142
143 return pt;
144 }
145
146 static const unsigned kSegLen = 9;
147 static const unsigned kStretchFactor = 2;
148 SkSTArray<2, ImageSet> fSets;
149
150 typedef GM INHERITED;
151 };
152
153 DEF_GM(return new ImageScaleAlignedGM();)
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