/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkCanvas.h"
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#include "SkDashPathEffect.h"
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#include "SkImageInfo.h"
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#include "SkMatrix.h"
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#include "SkPaint.h"
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#include "SkPath.h"
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#include "SkPathEffect.h"
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#include "SkPoint.h"
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#include "SkRect.h"
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#include "SkRefCnt.h"
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#include "SkScalar.h"
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#include "SkStrokeRec.h"
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#include "SkSurface.h"
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#include "SkTypes.h"
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#include "Test.h"
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// crbug.com/348821 was rooted in SkDashPathEffect refusing to flatten and unflatten itself when
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// the effect is nonsense. Here we test that it fails when passed nonsense parameters.
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DEF_TEST(DashPathEffectTest_crbug_348821, r) {
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SkScalar intervals[] = { 1.76934361e+36f, 2.80259693e-45f }; // Values from bug.
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const int count = 2;
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SkScalar phase = SK_ScalarInfinity; // Used to force a nonsense effect.
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sk_sp<SkPathEffect> dash(SkDashPathEffect::Make(intervals, count, phase));
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REPORTER_ASSERT(r, dash == nullptr);
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}
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// Test out the asPoint culling behavior.
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DEF_TEST(DashPathEffectTest_asPoints, r) {
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const SkScalar intervals[] = { 1.0f, 1.0f };
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const int count = 2;
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sk_sp<SkPathEffect> dash(SkDashPathEffect::Make(intervals, count, 0.0f));
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SkRect cull = SkRect::MakeWH(1.0f, 1.0f);
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const struct {
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SkPoint fPts[2];
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bool fExpectedResult;
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} testCases[] = {
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{ { { -5.0f, 0.5f }, { -4.0f, 0.5f } }, false }, // off to the left
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{ { { 4.0f, 0.5f }, { 5.0f, 0.5f } }, false }, // off to the right
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{ { { 0.5f, 4.0f }, { 0.5f, 5.0f } }, false }, // off the bottom
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{ { { 0.5f, -5.0f }, { 0.5f, -4.0f } }, false }, // off the top
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{ { { 0.5f, 0.2f }, { 0.5f, 0.8f } }, true }, // entirely inside vertical
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{ { { 0.2f, 0.5f }, { 0.8f, 0.5f } }, true }, // entirely inside horizontal
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{ { { 0.5f, -5.0f }, { 0.5f, 5.0f } }, true }, // straddles both sides vertically
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{ { { -5.0f, 0.5f }, { 5.0f, 0.5f } }, true }, // straddles both sides horizontally
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{ { { 0.5f, -5.0f }, { 0.5f, 0.5f } }, true }, // straddles top
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{ { { 0.5f, 5.0f }, { 0.5f, 0.5f } }, true }, // straddles bottom
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{ { { -5.0f, 0.5f }, { 0.5f, 0.5f } }, true }, // straddles left
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{ { { 5.0f, 0.5f }, { 0.5f, 0.5f } }, true }, // straddles right
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{ { { 0.5f, 0.5f }, { 0.5f, 0.5f } }, false }, // zero length
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};
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(1.0f);
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SkStrokeRec rec(paint);
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static const int kNumMats = 3;
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SkMatrix mats[kNumMats];
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mats[0].reset();
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mats[1].setRotate(90, 0.5f, 0.5f);
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mats[2].setTranslate(10.0f, 10.0f);
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for (int i = 0; i < kNumMats; ++i) {
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for (int j = 0; j < (int)SK_ARRAY_COUNT(testCases); ++j) {
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for (int k = 0; k < 2; ++k) { // exercise alternating endpoints
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SkPathEffect::PointData results;
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SkPath src;
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src.moveTo(testCases[j].fPts[k]);
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src.lineTo(testCases[j].fPts[(k+1)%2]);
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bool actualResult = dash->asPoints(&results, src, rec, mats[i], &cull);
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if (i < 2) {
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REPORTER_ASSERT(r, actualResult == testCases[j].fExpectedResult);
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} else {
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// On the third pass all the lines should be outside the translated cull rect
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REPORTER_ASSERT(r, !actualResult);
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}
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}
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}
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}
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}
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DEF_TEST(DashPath_bug4871, r) {
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SkPath path;
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path.moveTo(30, 24);
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path.cubicTo(30.002f, 24, 30, 24, 30, 24);
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path.close();
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SkScalar intervals[2] = { 1, 1 };
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sk_sp<SkPathEffect> dash(SkDashPathEffect::Make(intervals, 2, 0));
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setPathEffect(dash);
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SkPath fill;
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paint.getFillPath(path, &fill);
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}
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// Verify that long lines with many dashes don't cause overflows/OOMs.
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DEF_TEST(DashPathEffectTest_asPoints_limit, r) {
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sk_sp<SkSurface> surface(SkSurface::MakeRaster(SkImageInfo::MakeN32Premul(256, 256)));
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SkCanvas* canvas = surface->getCanvas();
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SkPaint p;
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p.setStyle(SkPaint::kStroke_Style);
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// force the bounds to outset by a large amount
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p.setStrokeWidth(5.0e10f);
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const SkScalar intervals[] = { 1, 1 };
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p.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 0));
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canvas->drawLine(1, 1, 1, 5.0e10f, p);
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}
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// This used to cause SkDashImpl to walk off the end of the intervals array, due to underflow
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// trying to substract a smal value from a large one in floats.
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DEF_TEST(DashCrazy_crbug_875494, r) {
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SkScalar vals[] = { 98, 94, 2888458849.f, 227, 0, 197 };
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const int N = SK_ARRAY_COUNT(vals);
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SkRect cull = SkRect::MakeXYWH(43,236,57,149);
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SkPath path;
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path.addRect(cull);
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SkPath path2;
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setPathEffect(SkDashPathEffect::Make(vals, N, 222));
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paint.getFillPath(path, &path2, &cull);
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}
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