1/*
2 * Copyright 2014 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 "Test.h"
9
10#include "SkDashPathEffect.h"
11#include "SkWriteBuffer.h"
12#include "SkStrokeRec.h"
13#include "SkCanvas.h"
14#include "SkSurface.h"
15
16// crbug.com/348821 was rooted in SkDashPathEffect refusing to flatten and unflatten itself when
17// the effect is nonsense.  Here we test that it fails when passed nonsense parameters.
18
19DEF_TEST(DashPathEffectTest_crbug_348821, r) {
20    SkScalar intervals[] = { 1.76934361e+36f, 2.80259693e-45f };  // Values from bug.
21    const int count = 2;
22    SkScalar phase = SK_ScalarInfinity;  // Used to force a nonsense effect.
23    sk_sp<SkPathEffect> dash(SkDashPathEffect::Make(intervals, count, phase));
24
25    REPORTER_ASSERT(r, dash == nullptr);
26}
27
28// Test out the asPoint culling behavior.
29DEF_TEST(DashPathEffectTest_asPoints, r) {
30
31    const SkScalar intervals[] = { 1.0f, 1.0f };
32    const int count = 2;
33    sk_sp<SkPathEffect> dash(SkDashPathEffect::Make(intervals, count, 0.0f));
34
35    SkRect cull = SkRect::MakeWH(1.0f, 1.0f);
36
37    const struct {
38        SkPoint fPts[2];
39        bool    fExpectedResult;
40    } testCases[] = {
41        { { { -5.0f,  0.5f }, { -4.0f,  0.5f } }, false },   // off to the left
42        { { {  4.0f,  0.5f }, {  5.0f,  0.5f } }, false },   // off to the right
43        { { {  0.5f,  4.0f }, {  0.5f,  5.0f } }, false },   // off the bottom
44        { { {  0.5f, -5.0f }, {  0.5f, -4.0f } }, false },   // off the top
45        { { {  0.5f,  0.2f }, {  0.5f,  0.8f } }, true  },   // entirely inside vertical
46        { { {  0.2f,  0.5f }, {  0.8f,  0.5f } }, true  },   // entirely inside horizontal
47        { { {  0.5f, -5.0f }, {  0.5f,  5.0f } }, true  },   // straddles both sides vertically
48        { { { -5.0f,  0.5f }, {  5.0f,  0.5f } }, true  },   // straddles both sides horizontally
49        { { {  0.5f, -5.0f }, {  0.5f,  0.5f } }, true  },   // straddles top
50        { { {  0.5f,  5.0f }, {  0.5f,  0.5f } }, true  },   // straddles bottom
51        { { { -5.0f,  0.5f }, {  0.5f,  0.5f } }, true  },   // straddles left
52        { { {  5.0f,  0.5f }, {  0.5f,  0.5f } }, true  },   // straddles right
53        { { {  0.5f,  0.5f }, {  0.5f,  0.5f } }, false },   // zero length
54    };
55
56    SkPaint paint;
57    paint.setStyle(SkPaint::kStroke_Style);
58    paint.setStrokeWidth(1.0f);
59    SkStrokeRec rec(paint);
60
61    static const int kNumMats = 3;
62    SkMatrix mats[kNumMats];
63    mats[0].reset();
64    mats[1].setRotate(90, 0.5f, 0.5f);
65    mats[2].setTranslate(10.0f, 10.0f);
66
67    for (int i = 0; i < kNumMats; ++i) {
68        for (int j = 0; j < (int)SK_ARRAY_COUNT(testCases); ++j) {
69            for (int k = 0; k < 2; ++k) {  // exercise alternating endpoints
70                SkPathEffect::PointData results;
71                SkPath src;
72
73                src.moveTo(testCases[j].fPts[k]);
74                src.lineTo(testCases[j].fPts[(k+1)%2]);
75
76                bool actualResult = dash->asPoints(&results, src, rec, mats[i], &cull);
77                if (i < 2) {
78                    REPORTER_ASSERT(r, actualResult == testCases[j].fExpectedResult);
79                } else {
80                    // On the third pass all the lines should be outside the translated cull rect
81                    REPORTER_ASSERT(r, !actualResult);
82                }
83            }
84        }
85    }
86}
87
88DEF_TEST(DashPath_bug4871, r) {
89    SkPath path;
90    path.moveTo(30, 24);
91    path.cubicTo(30.002f, 24, 30, 24, 30, 24);
92    path.close();
93
94    SkScalar intervals[2] = { 1, 1 };
95    sk_sp<SkPathEffect> dash(SkDashPathEffect::Make(intervals, 2, 0));
96
97    SkPaint paint;
98    paint.setStyle(SkPaint::kStroke_Style);
99    paint.setPathEffect(dash);
100
101    SkPath fill;
102    paint.getFillPath(path, &fill);
103}
104
105// Verify that long lines with many dashes don't cause overflows/OOMs.
106DEF_TEST(DashPathEffectTest_asPoints_limit, r) {
107    sk_sp<SkSurface> surface(SkSurface::MakeRaster(SkImageInfo::MakeN32Premul(256, 256)));
108    SkCanvas* canvas = surface->getCanvas();
109
110    SkPaint p;
111    p.setStyle(SkPaint::kStroke_Style);
112    // force the bounds to outset by a large amount
113    p.setStrokeWidth(5.0e10f);
114    const SkScalar intervals[] = { 1, 1 };
115    p.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 0));
116    canvas->drawLine(1, 1, 1, 5.0e10f, p);
117}
118