1/*
2 * Copyright 2012 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 "SkBitmap.h"
9#include "SkCanvas.h"
10#include "SkDashPathEffect.h"
11#include "SkSurface.h"
12#include "Test.h"
13
14// test that we can draw an aa-rect at coordinates > 32K (bigger than fixedpoint)
15static void test_big_aa_rect(skiatest::Reporter* reporter) {
16    SkBitmap output;
17    SkPMColor pixel[1];
18    output.installPixels(SkImageInfo::MakeN32Premul(1, 1), pixel, 4);
19
20    SkSurface* surf = SkSurface::NewRasterPMColor(300, 33300);
21    SkCanvas* canvas = surf->getCanvas();
22
23    SkRect r = { 0, 33000, 300, 33300 };
24    int x = SkScalarRoundToInt(r.left());
25    int y = SkScalarRoundToInt(r.top());
26
27    // check that the pixel in question starts as transparent (by the surface)
28    if (canvas->readPixels(&output, x, y)) {
29        REPORTER_ASSERT(reporter, 0 == pixel[0]);
30    } else {
31        REPORTER_ASSERT_MESSAGE(reporter, false, "readPixels failed");
32    }
33
34    SkPaint paint;
35    paint.setAntiAlias(true);
36    paint.setColor(SK_ColorWHITE);
37
38    canvas->drawRect(r, paint);
39
40    // Now check that it is BLACK
41    if (canvas->readPixels(&output, x, y)) {
42        // don't know what swizzling PMColor did, but white should always
43        // appear the same.
44        REPORTER_ASSERT(reporter, 0xFFFFFFFF == pixel[0]);
45    } else {
46        REPORTER_ASSERT_MESSAGE(reporter, false, "readPixels failed");
47    }
48    surf->unref();
49}
50
51///////////////////////////////////////////////////////////////////////////////
52
53static void moveToH(SkPath* path, const uint32_t raw[]) {
54    const float* fptr = (const float*)raw;
55    path->moveTo(fptr[0], fptr[1]);
56}
57
58static void cubicToH(SkPath* path, const uint32_t raw[]) {
59    const float* fptr = (const float*)raw;
60    path->cubicTo(fptr[0], fptr[1], fptr[2], fptr[3], fptr[4], fptr[5]);
61}
62
63// This used to assert, because we performed a cast (int)(pt[0].fX * scale) to
64// arrive at an int (SkFDot6) rather than calling sk_float_round2int. The assert
65// was that the initial line-segment produced by the cubic was not monotonically
66// going down (i.e. the initial DY was negative). By rounding the floats, we get
67// the more proper result.
68//
69// http://code.google.com/p/chromium/issues/detail?id=131181
70//
71
72// we're not calling this test anymore; is that for a reason?
73
74static void test_crbug131181() {
75    /*
76     fX = 18.8943768,
77     fY = 129.121277
78     }, {
79     fX = 18.8937435,
80     fY = 129.121689
81     }, {
82     fX = 18.8950119,
83     fY = 129.120422
84     }, {
85     fX = 18.5030727,
86     fY = 129.13121
87     */
88    uint32_t data[] = {
89        0x419727af, 0x43011f0c, 0x41972663, 0x43011f27,
90        0x419728fc, 0x43011ed4, 0x4194064b, 0x43012197
91    };
92
93    SkPath path;
94    moveToH(&path, &data[0]);
95    cubicToH(&path, &data[2]);
96
97    SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterN32(640, 480));
98
99    SkPaint paint;
100    paint.setAntiAlias(true);
101    canvas->drawPath(path, paint);
102}
103
104// This used to assert in debug builds (and crash writing bad memory in release)
105// because we overflowed an intermediate value (B coefficient) setting up our
106// stepper for the quadratic. Now we bias that value by 1/2 so we don't overflow
107static void test_crbug_140803() {
108    SkBitmap bm;
109    bm.allocN32Pixels(2700, 30*1024);
110    SkCanvas canvas(bm);
111
112    SkPath path;
113    path.moveTo(2762, 20);
114    path.quadTo(11, 21702, 10, 21706);
115    SkPaint paint;
116    paint.setAntiAlias(true);
117    canvas.drawPath(path, paint);
118}
119
120// Need to exercise drawing an inverse-path whose bounds intersect the clip,
121// but whose edges do not (since its a quad which draws only in the bottom half
122// of its bounds).
123// In the debug build, we used to assert in this case, until it was fixed.
124//
125static void test_inversepathwithclip() {
126    SkPath path;
127
128    path.moveTo(0, SkIntToScalar(20));
129    path.quadTo(SkIntToScalar(10), SkIntToScalar(10),
130                SkIntToScalar(20), SkIntToScalar(20));
131    path.toggleInverseFillType();
132
133    SkPaint paint;
134
135    SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterN32(640, 480));
136    canvas.get()->save();
137    canvas.get()->clipRect(SkRect::MakeWH(SkIntToScalar(19), SkIntToScalar(11)));
138
139    paint.setAntiAlias(false);
140    canvas.get()->drawPath(path, paint);
141    paint.setAntiAlias(true);
142    canvas.get()->drawPath(path, paint);
143
144    canvas.get()->restore();
145
146    // Now do the test again, with the path flipped, so we only draw in the
147    // top half of our bounds, and have the clip intersect our bounds at the
148    // bottom.
149    path.reset();   // preserves our filltype
150    path.moveTo(0, SkIntToScalar(10));
151    path.quadTo(SkIntToScalar(10), SkIntToScalar(20),
152                SkIntToScalar(20), SkIntToScalar(10));
153    canvas.get()->clipRect(SkRect::MakeXYWH(SkIntToScalar(0), SkIntToScalar(19),
154                                            SkIntToScalar(19), SkIntToScalar(11)));
155
156    paint.setAntiAlias(false);
157    canvas.get()->drawPath(path, paint);
158    paint.setAntiAlias(true);
159    canvas.get()->drawPath(path, paint);
160}
161
162static void test_bug533() {
163    /*
164        http://code.google.com/p/skia/issues/detail?id=533
165        This particular test/bug only applies to the float case, where the
166        coordinates are very large.
167     */
168    SkPath path;
169    path.moveTo(64, 3);
170    path.quadTo(-329936, -100000000, 1153, 330003);
171
172    SkPaint paint;
173    paint.setAntiAlias(true);
174
175    SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterN32(640, 480));
176    canvas.get()->drawPath(path, paint);
177}
178
179static void test_crbug_140642() {
180    /*
181     *  We used to see this construct, and due to rounding as we accumulated
182     *  our length, the loop where we apply the phase would run off the end of
183     *  the array, since it relied on just -= each interval value, which did not
184     *  behave as "expected". Now the code explicitly checks for walking off the
185     *  end of that array.
186
187     *  A different (better) fix might be to rewrite dashing to do all of its
188     *  length/phase/measure math using double, but this may need to be
189     *  coordinated with SkPathMeasure, to be consistent between the two.
190
191     <path stroke="mintcream" stroke-dasharray="27734 35660 2157846850 247"
192           stroke-dashoffset="-248.135982067">
193     */
194
195    const SkScalar vals[] = { 27734, 35660, 2157846850.0f, 247 };
196    SkAutoTUnref<SkDashPathEffect> dontAssert(SkDashPathEffect::Create(vals, 4, -248.135982067f));
197}
198
199static void test_crbug_124652() {
200    /*
201        http://code.google.com/p/chromium/issues/detail?id=124652
202        This particular test/bug only applies to the float case, where
203        large values can "swamp" small ones.
204     */
205    SkScalar intervals[2] = {837099584, 33450};
206    SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, -10));
207}
208
209static void test_bigcubic() {
210    SkPath path;
211    path.moveTo(64, 3);
212    path.cubicTo(-329936, -100000000, -329936, 100000000, 1153, 330003);
213
214    SkPaint paint;
215    paint.setAntiAlias(true);
216
217    SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterN32(640, 480));
218    canvas.get()->drawPath(path, paint);
219}
220
221// we used to assert if the bounds of the device (clip) was larger than 32K
222// even when the path itself was smaller. We just draw and hope in the debug
223// version to not assert.
224static void test_giantaa() {
225    const int W = 400;
226    const int H = 400;
227    SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterN32(33000, 10));
228
229    SkPaint paint;
230    paint.setAntiAlias(true);
231    SkPath path;
232    path.addOval(SkRect::MakeXYWH(-10, -10, 20 + W, 20 + H));
233    canvas.get()->drawPath(path, paint);
234}
235
236// Extremely large path_length/dash_length ratios may cause infinite looping
237// in SkDashPathEffect::filterPath() due to single precision rounding.
238// The test is quite expensive, but it should get much faster after the fix
239// for http://crbug.com/165432 goes in.
240static void test_infinite_dash(skiatest::Reporter* reporter) {
241    SkPath path;
242    path.moveTo(0, 0);
243    path.lineTo(5000000, 0);
244
245    SkScalar intervals[] = { 0.2f, 0.2f };
246    SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0));
247
248    SkPath filteredPath;
249    SkPaint paint;
250    paint.setStyle(SkPaint::kStroke_Style);
251    paint.setPathEffect(dash);
252
253    paint.getFillPath(path, &filteredPath);
254    // If we reach this, we passed.
255    REPORTER_ASSERT(reporter, true);
256}
257
258// http://crbug.com/165432
259// Limit extreme dash path effects to avoid exhausting the system memory.
260static void test_crbug_165432(skiatest::Reporter* reporter) {
261    SkPath path;
262    path.moveTo(0, 0);
263    path.lineTo(10000000, 0);
264
265    SkScalar intervals[] = { 0.5f, 0.5f };
266    SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0));
267
268    SkPaint paint;
269    paint.setStyle(SkPaint::kStroke_Style);
270    paint.setPathEffect(dash);
271
272    SkPath filteredPath;
273    SkStrokeRec rec(paint);
274    REPORTER_ASSERT(reporter, !dash->filterPath(&filteredPath, path, &rec, NULL));
275    REPORTER_ASSERT(reporter, filteredPath.isEmpty());
276}
277
278DEF_TEST(DrawPath, reporter) {
279    test_giantaa();
280    test_bug533();
281    test_bigcubic();
282    test_crbug_124652();
283    test_crbug_140642();
284    test_crbug_140803();
285    test_inversepathwithclip();
286    // why?
287    if (false) test_crbug131181();
288    test_infinite_dash(reporter);
289    test_crbug_165432(reporter);
290    test_big_aa_rect(reporter);
291}
292