Chris Dalton | 04a1de5 | 2018-03-14 02:04:09 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018 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 | |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 8 | #include "gm/gm.h" |
Ben Wagner | 7fde8e1 | 2019-05-01 17:28:53 -0400 | [diff] [blame] | 9 | #include "include/core/SkCanvas.h" |
| 10 | #include "include/core/SkColor.h" |
| 11 | #include "include/core/SkMatrix.h" |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 12 | #include "include/core/SkPaint.h" |
| 13 | #include "include/core/SkPath.h" |
| 14 | #include "include/core/SkPoint.h" |
Ben Wagner | 7fde8e1 | 2019-05-01 17:28:53 -0400 | [diff] [blame] | 15 | #include "include/core/SkRect.h" |
| 16 | #include "include/core/SkScalar.h" |
| 17 | #include "include/core/SkSize.h" |
| 18 | #include "include/core/SkString.h" |
| 19 | #include "include/core/SkTypes.h" |
| 20 | #include "include/utils/SkRandom.h" |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 21 | #include "tools/ToolUtils.h" |
Hal Canary | 8a00144 | 2018-09-19 11:31:27 -0400 | [diff] [blame] | 22 | |
Chris Dalton | 04a1de5 | 2018-03-14 02:04:09 -0600 | [diff] [blame] | 23 | #include <array> |
| 24 | #include <vector> |
| 25 | |
| 26 | namespace skiagm { |
| 27 | |
| 28 | static constexpr int kPadSize = 20; |
| 29 | static constexpr int kBoxSize = 100; |
| 30 | static constexpr SkPoint kJitters[] = {{0, 0}, {.5f, .5f}, {2/3.f, 1/3.f}}; |
| 31 | |
| 32 | // Tests various corners of different angles falling on the same pixel, particularly to ensure |
| 33 | // analytic AA is working properly. |
| 34 | class SharedCornersGM : public GM { |
| 35 | public: |
Mike Klein | ea3f014 | 2019-03-20 11:12:10 -0500 | [diff] [blame] | 36 | SharedCornersGM() { this->setBGColor(ToolUtils::color_to_565(0xFF1A65D7)); } |
Chris Dalton | 04a1de5 | 2018-03-14 02:04:09 -0600 | [diff] [blame] | 37 | |
| 38 | protected: |
| 39 | SkString onShortName() override { |
| 40 | return SkString("sharedcorners"); |
| 41 | } |
| 42 | |
| 43 | SkISize onISize() override { |
| 44 | constexpr int numRows = 3 * 2; |
| 45 | constexpr int numCols = (1 + SK_ARRAY_COUNT(kJitters)) * 2; |
| 46 | return SkISize::Make(numCols * (kBoxSize + kPadSize) + kPadSize, |
| 47 | numRows * (kBoxSize + kPadSize) + kPadSize); |
| 48 | } |
| 49 | |
| 50 | void onOnceBeforeDraw() override { |
| 51 | fFillPaint.setColor(SK_ColorWHITE); |
| 52 | fFillPaint.setAntiAlias(true); |
| 53 | |
| 54 | fWireFramePaint = fFillPaint; |
| 55 | fWireFramePaint.setStyle(SkPaint::kStroke_Style); |
| 56 | |
| 57 | } |
| 58 | |
| 59 | void onDraw(SkCanvas* canvas) override { |
| 60 | canvas->translate(kPadSize, kPadSize); |
| 61 | canvas->save(); |
| 62 | |
| 63 | // Adjacent rects. |
| 64 | this->drawTriangleBoxes(canvas, |
| 65 | {{0, 0}, {40, 0}, {80, 0}, {120, 0}, |
| 66 | {0, 20}, {40, 20}, {80, 20}, {120, 20}, |
| 67 | {40, 40}, {80, 40}, |
| 68 | {40, 60}, {80, 60}}, |
| 69 | {{{0, 1, 4}}, {{1, 5, 4}}, |
| 70 | {{5, 1, 6}}, {{1, 2, 6}}, |
| 71 | {{2, 3, 6}}, {{3, 7, 6}}, |
| 72 | {{8, 5, 9}}, {{5, 6, 9}}, |
| 73 | {{10, 8, 11}}, {{8, 9, 11}}}); |
| 74 | |
| 75 | // Obtuse angles. |
| 76 | this->drawTriangleBoxes(canvas, |
| 77 | {{ 0, 0}, {10, 0}, {20, 0}, |
| 78 | { 0, 2}, {20, 2}, |
| 79 | {10, 4}, |
| 80 | { 0, 6}, {20, 6}, |
| 81 | { 0, 8}, {10, 8}, {20, 8}}, |
| 82 | {{{3, 1, 4}}, {{4, 5, 3}}, {{6, 5, 7}}, {{7, 9, 6}}, |
| 83 | {{0, 1, 3}}, {{1, 2, 4}}, |
| 84 | {{3, 5, 6}}, {{5, 4, 7}}, |
| 85 | {{6, 9, 8}}, {{9, 7, 10}}}); |
| 86 | |
| 87 | canvas->restore(); |
| 88 | canvas->translate((kBoxSize + kPadSize) * 4, 0); |
| 89 | |
| 90 | // Right angles. |
| 91 | this->drawTriangleBoxes(canvas, |
| 92 | {{0, 0}, {-1, 0}, {0, -1}, {1, 0}, {0, 1}}, |
| 93 | {{{0, 1, 2}}, {{0, 2, 3}}, {{0, 3, 4}}, {{0, 4, 1}}}); |
| 94 | |
| 95 | // Acute angles. |
| 96 | SkRandom rand; |
| 97 | std::vector<SkPoint> pts; |
| 98 | std::vector<std::array<int, 3>> indices; |
| 99 | SkScalar theta = 0; |
| 100 | pts.push_back({0, 0}); |
| 101 | while (theta < 2*SK_ScalarPI) { |
| 102 | pts.push_back({SkScalarCos(theta), SkScalarSin(theta)}); |
| 103 | if (pts.size() > 2) { |
| 104 | indices.push_back({{0, (int)pts.size() - 2, (int)pts.size() - 1}}); |
| 105 | } |
| 106 | theta += rand.nextRangeF(0, SK_ScalarPI/3); |
| 107 | } |
| 108 | indices.push_back({{0, (int)pts.size() - 1, 1}}); |
| 109 | this->drawTriangleBoxes(canvas, pts, indices); |
| 110 | } |
| 111 | |
| 112 | void drawTriangleBoxes(SkCanvas* canvas, const std::vector<SkPoint>& points, |
| 113 | const std::vector<std::array<int, 3>>& triangles) { |
| 114 | SkPath path; |
| 115 | path.setFillType(SkPath::kEvenOdd_FillType); |
| 116 | path.setIsVolatile(true); |
| 117 | for (const std::array<int, 3>& triangle : triangles) { |
| 118 | path.moveTo(points[triangle[0]]); |
| 119 | path.lineTo(points[triangle[1]]); |
| 120 | path.lineTo(points[triangle[2]]); |
| 121 | path.close(); |
| 122 | } |
| 123 | SkScalar scale = kBoxSize / SkTMax(path.getBounds().height(), path.getBounds().width()); |
| 124 | path.transform(SkMatrix::MakeScale(scale, scale)); |
| 125 | |
| 126 | this->drawRow(canvas, path); |
| 127 | canvas->translate(0, kBoxSize + kPadSize); |
| 128 | |
| 129 | SkMatrix rot; |
| 130 | rot.setRotate(45, path.getBounds().centerX(), path.getBounds().centerY()); |
| 131 | path.transform(rot); |
| 132 | this->drawRow(canvas, path); |
| 133 | canvas->translate(0, kBoxSize + kPadSize); |
| 134 | |
| 135 | rot.setRotate(-45 - 69.38111f, path.getBounds().centerX(), path.getBounds().centerY()); |
| 136 | path.transform(rot); |
| 137 | this->drawRow(canvas, path); |
| 138 | canvas->translate(0, kBoxSize + kPadSize); |
| 139 | } |
| 140 | |
| 141 | void drawRow(SkCanvas* canvas, const SkPath& path) { |
| 142 | SkAutoCanvasRestore acr(canvas, true); |
| 143 | const SkRect& bounds = path.getBounds(); |
| 144 | canvas->translate((kBoxSize - bounds.width()) / 2 - bounds.left(), |
| 145 | (kBoxSize - bounds.height()) / 2 - bounds.top()); |
| 146 | |
| 147 | canvas->drawPath(path, fWireFramePaint); |
| 148 | canvas->translate(kBoxSize + kPadSize, 0); |
| 149 | |
| 150 | for (SkPoint jitter : kJitters) { |
| 151 | { |
| 152 | SkAutoCanvasRestore acr(canvas, true); |
| 153 | canvas->translate(jitter.x(), jitter.y()); |
| 154 | canvas->drawPath(path, fFillPaint); |
| 155 | } |
| 156 | canvas->translate(kBoxSize + kPadSize, 0); |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | SkPaint fWireFramePaint; |
| 161 | SkPaint fFillPaint; |
| 162 | }; |
| 163 | |
| 164 | DEF_GM(return new SharedCornersGM;) |
| 165 | |
| 166 | } |