/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkDashPathEffect.h"
#include "SkSurface.h"
#include "Test.h"
// test that we can draw an aa-rect at coordinates > 32K (bigger than fixedpoint)
static void test_big_aa_rect(skiatest::Reporter* reporter) {
SkBitmap output;
SkPMColor pixel[1];
output.installPixels(SkImageInfo::MakeN32Premul(1, 1), pixel, 4);
SkSurface* surf = SkSurface::NewRasterN32Premul(300, 33300);
SkCanvas* canvas = surf->getCanvas();
SkRect r = { 0, 33000, 300, 33300 };
int x = SkScalarRoundToInt(r.left());
int y = SkScalarRoundToInt(r.top());
// check that the pixel in question starts as transparent (by the surface)
if (canvas->readPixels(&output, x, y)) {
REPORTER_ASSERT(reporter, 0 == pixel[0]);
} else {
REPORTER_ASSERT_MESSAGE(reporter, false, "readPixels failed");
}
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorWHITE);
canvas->drawRect(r, paint);
// Now check that it is BLACK
if (canvas->readPixels(&output, x, y)) {
// don't know what swizzling PMColor did, but white should always
// appear the same.
REPORTER_ASSERT(reporter, 0xFFFFFFFF == pixel[0]);
} else {
REPORTER_ASSERT_MESSAGE(reporter, false, "readPixels failed");
}
surf->unref();
}
///////////////////////////////////////////////////////////////////////////////
static void moveToH(SkPath* path, const uint32_t raw[]) {
const float* fptr = (const float*)raw;
path->moveTo(fptr[0], fptr[1]);
}
static void cubicToH(SkPath* path, const uint32_t raw[]) {
const float* fptr = (const float*)raw;
path->cubicTo(fptr[0], fptr[1], fptr[2], fptr[3], fptr[4], fptr[5]);
}
// This used to assert, because we performed a cast (int)(pt[0].fX * scale) to
// arrive at an int (SkFDot6) rather than calling sk_float_round2int. The assert
// was that the initial line-segment produced by the cubic was not monotonically
// going down (i.e. the initial DY was negative). By rounding the floats, we get
// the more proper result.
//
// http://code.google.com/p/chromium/issues/detail?id=131181
//
// we're not calling this test anymore; is that for a reason?
static void test_crbug131181() {
/*
fX = 18.8943768,
fY = 129.121277
}, {
fX = 18.8937435,
fY = 129.121689
}, {
fX = 18.8950119,
fY = 129.120422
}, {
fX = 18.5030727,
fY = 129.13121
*/
uint32_t data[] = {
0x419727af, 0x43011f0c, 0x41972663, 0x43011f27,
0x419728fc, 0x43011ed4, 0x4194064b, 0x43012197
};
SkPath path;
moveToH(&path, &data[0]);
cubicToH(&path, &data[2]);
SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(640, 480));
SkPaint paint;
paint.setAntiAlias(true);
surface->getCanvas()->drawPath(path, paint);
}
// This used to assert in debug builds (and crash writing bad memory in release)
// because we overflowed an intermediate value (B coefficient) setting up our
// stepper for the quadratic. Now we bias that value by 1/2 so we don't overflow
static void test_crbug_140803() {
SkBitmap bm;
bm.allocN32Pixels(2700, 30*1024);
SkCanvas canvas(bm);
SkPath path;
path.moveTo(2762, 20);
path.quadTo(11, 21702, 10, 21706);
SkPaint paint;
paint.setAntiAlias(true);
canvas.drawPath(path, paint);
}
// Need to exercise drawing an inverse-path whose bounds intersect the clip,
// but whose edges do not (since its a quad which draws only in the bottom half
// of its bounds).
// In the debug build, we used to assert in this case, until it was fixed.
//
static void test_inversepathwithclip() {
SkPath path;
path.moveTo(0, 20);
path.quadTo(10, 10, 20, 20);
path.toggleInverseFillType();
SkPaint paint;
SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(640, 480));
SkCanvas* canvas = surface->getCanvas();
canvas->save();
canvas->clipRect(SkRect::MakeWH(19, 11));
paint.setAntiAlias(false);
canvas->drawPath(path, paint);
paint.setAntiAlias(true);
canvas->drawPath(path, paint);
canvas->restore();
// Now do the test again, with the path flipped, so we only draw in the
// top half of our bounds, and have the clip intersect our bounds at the
// bottom.
path.reset(); // preserves our filltype
path.moveTo(0, 10);
path.quadTo(10, 20, 20, 10);
canvas->clipRect(SkRect::MakeXYWH(0, 19, 19, 11));
paint.setAntiAlias(false);
canvas->drawPath(path, paint);
paint.setAntiAlias(true);
canvas->drawPath(path, paint);
}
static void test_bug533() {
/*
http://code.google.com/p/skia/issues/detail?id=533
This particular test/bug only applies to the float case, where the
coordinates are very large.
*/
SkPath path;
path.moveTo(64, 3);
path.quadTo(-329936, -100000000, 1153, 330003);
SkPaint paint;
paint.setAntiAlias(true);
SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(640, 480));
surface->getCanvas()->drawPath(path, paint);
}
static void test_crbug_140642() {
/*
* We used to see this construct, and due to rounding as we accumulated
* our length, the loop where we apply the phase would run off the end of
* the array, since it relied on just -= each interval value, which did not
* behave as "expected". Now the code explicitly checks for walking off the
* end of that array.
* A different (better) fix might be to rewrite dashing to do all of its
* length/phase/measure math using double, but this may need to be
* coordinated with SkPathMeasure, to be consistent between the two.
<path stroke="mintcream" stroke-dasharray="27734 35660 2157846850 247"
stroke-dashoffset="-248.135982067">
*/
const SkScalar vals[] = { 27734, 35660, 2157846850.0f, 247 };
SkAutoTUnref<SkDashPathEffect> dontAssert(SkDashPathEffect::Create(vals, 4, -248.135982067f));
}
static void test_crbug_124652() {
/*
http://code.google.com/p/chromium/issues/detail?id=124652
This particular test/bug only applies to the float case, where
large values can "swamp" small ones.
*/
SkScalar intervals[2] = {837099584, 33450};
SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, -10));
}
static void test_bigcubic() {
SkPath path;
path.moveTo(64, 3);
path.cubicTo(-329936, -100000000, -329936, 100000000, 1153, 330003);
SkPaint paint;
paint.setAntiAlias(true);
SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(640, 480));
surface->getCanvas()->drawPath(path, paint);
}
// we used to assert if the bounds of the device (clip) was larger than 32K
// even when the path itself was smaller. We just draw and hope in the debug
// version to not assert.
static void test_giantaa() {
const int W = 400;
const int H = 400;
SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(33000, 10));
SkPaint paint;
paint.setAntiAlias(true);
SkPath path;
path.addOval(SkRect::MakeXYWH(-10, -10, 20 + W, 20 + H));
surface->getCanvas()->drawPath(path, paint);
}
// Extremely large path_length/dash_length ratios may cause infinite looping
// in SkDashPathEffect::filterPath() due to single precision rounding.
// The test is quite expensive, but it should get much faster after the fix
// for http://crbug.com/165432 goes in.
static void test_infinite_dash(skiatest::Reporter* reporter) {
SkPath path;
path.moveTo(0, 0);
path.lineTo(5000000, 0);
SkScalar intervals[] = { 0.2f, 0.2f };
SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0));
SkPath filteredPath;
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setPathEffect(dash);
paint.getFillPath(path, &filteredPath);
// If we reach this, we passed.
REPORTER_ASSERT(reporter, true);
}
// http://crbug.com/165432
// Limit extreme dash path effects to avoid exhausting the system memory.
static void test_crbug_165432(skiatest::Reporter* reporter) {
SkPath path;
path.moveTo(0, 0);
path.lineTo(10000000, 0);
SkScalar intervals[] = { 0.5f, 0.5f };
SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0));
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setPathEffect(dash);
SkPath filteredPath;
SkStrokeRec rec(paint);
REPORTER_ASSERT(reporter, !dash->filterPath(&filteredPath, path, &rec, NULL));
REPORTER_ASSERT(reporter, filteredPath.isEmpty());
}
DEF_TEST(DrawPath, reporter) {
test_giantaa();
test_bug533();
test_bigcubic();
test_crbug_124652();
test_crbug_140642();
test_crbug_140803();
test_inversepathwithclip();
// why?
if (false) test_crbug131181();
test_infinite_dash(reporter);
test_crbug_165432(reporter);
test_big_aa_rect(reporter);
}