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skia2/tests/RegionTest.cpp
commit-bot@chromium.org e0e7cfe44b Change old PRG to be SkLCGRandom; change new one to SkRandom 
The goal here is to get people to start using the new random number
generator, while leaving the old one in place so we don't have to 
rebaseline GMs.

R=reed@google.com, bsalomon@google.com

Author: jvanverth@google.com

Review URL: https://chromiumcodereview.appspot.com/23576015

git-svn-id: http://skia.googlecode.com/svn/trunk@11169 2bbb7eff-a529-9590-31e7-b0007b416f81
2013-09-09 20:09:12 +00:00

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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Test.h"
#include "SkRegion.h"
#include "SkRandom.h"
static void Union(SkRegion* rgn, const SkIRect& rect) {
rgn->op(rect, SkRegion::kUnion_Op);
}
#define TEST_NO_INTERSECT(rgn, rect) REPORTER_ASSERT(reporter, !rgn.intersects(rect))
#define TEST_INTERSECT(rgn, rect) REPORTER_ASSERT(reporter, rgn.intersects(rect))
#define TEST_NO_CONTAINS(rgn, rect) REPORTER_ASSERT(reporter, !rgn.contains(rect))
// inspired by http://code.google.com/p/skia/issues/detail?id=958
//
static void test_fromchrome(skiatest::Reporter* reporter) {
SkRegion r;
Union(&r, SkIRect::MakeXYWH(0, 0, 1, 1));
TEST_NO_INTERSECT(r, SkIRect::MakeXYWH(0, 0, 0, 0));
TEST_INTERSECT(r, SkIRect::MakeXYWH(0, 0, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(-1, 0, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(-1, -1, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(0, -1, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(-1, -1, 3, 3));
Union(&r, SkIRect::MakeXYWH(0, 0, 3, 3));
Union(&r, SkIRect::MakeXYWH(10, 0, 3, 3));
Union(&r, SkIRect::MakeXYWH(0, 10, 13, 3));
TEST_INTERSECT(r, SkIRect::MakeXYWH(-1, -1, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(2, -1, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(2, 2, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(-1, 2, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(9, -1, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(12, -1, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(12, 2, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(9, 2, 2, 2));
TEST_INTERSECT(r, SkIRect::MakeXYWH(0, -1, 13, 5));
TEST_INTERSECT(r, SkIRect::MakeXYWH(1, -1, 11, 5));
TEST_INTERSECT(r, SkIRect::MakeXYWH(2, -1, 9, 5));
TEST_INTERSECT(r, SkIRect::MakeXYWH(2, -1, 8, 5));
TEST_INTERSECT(r, SkIRect::MakeXYWH(3, -1, 8, 5));
TEST_INTERSECT(r, SkIRect::MakeXYWH(0, 1, 13, 1));
TEST_INTERSECT(r, SkIRect::MakeXYWH(1, 1, 11, 1));
TEST_INTERSECT(r, SkIRect::MakeXYWH(2, 1, 9, 1));
TEST_INTERSECT(r, SkIRect::MakeXYWH(2, 1, 8, 1));
TEST_INTERSECT(r, SkIRect::MakeXYWH(3, 1, 8, 1));
TEST_INTERSECT(r, SkIRect::MakeXYWH(0, 0, 13, 13));
TEST_INTERSECT(r, SkIRect::MakeXYWH(0, 1, 13, 11));
TEST_INTERSECT(r, SkIRect::MakeXYWH(0, 2, 13, 9));
TEST_INTERSECT(r, SkIRect::MakeXYWH(0, 2, 13, 8));
// These test SkRegion::contains(Rect) and SkRegion::contains(Region)
SkRegion container;
Union(&container, SkIRect::MakeXYWH(0, 0, 40, 20));
Union(&container, SkIRect::MakeXYWH(30, 20, 10, 20));
TEST_NO_CONTAINS(container, SkIRect::MakeXYWH(0, 0, 10, 39));
TEST_NO_CONTAINS(container, SkIRect::MakeXYWH(29, 0, 10, 39));
{
SkRegion rgn;
Union(&rgn, SkIRect::MakeXYWH(0, 0, 10, 10));
Union(&rgn, SkIRect::MakeLTRB(5, 10, 20, 20));
TEST_INTERSECT(rgn, SkIRect::MakeXYWH(15, 0, 5, 11));
}
}
static void test_empties(skiatest::Reporter* reporter) {
SkRegion valid(SkIRect::MakeWH(10, 10));
SkRegion empty, empty2;
REPORTER_ASSERT(reporter, empty.isEmpty());
REPORTER_ASSERT(reporter, !valid.isEmpty());
// test intersects
REPORTER_ASSERT(reporter, !empty.intersects(empty2));
REPORTER_ASSERT(reporter, !valid.intersects(empty));
// test contains
REPORTER_ASSERT(reporter, !empty.contains(empty2));
REPORTER_ASSERT(reporter, !valid.contains(empty));
REPORTER_ASSERT(reporter, !empty.contains(valid));
}
enum {
W = 256,
H = 256
};
static SkIRect randRect(SkRandom& rand) {
int x = rand.nextU() % W;
int y = rand.nextU() % H;
int w = rand.nextU() % W;
int h = rand.nextU() % H;
return SkIRect::MakeXYWH(x, y, w >> 1, h >> 1);
}
static void randRgn(SkRandom& rand, SkRegion* rgn, int n) {
rgn->setEmpty();
for (int i = 0; i < n; ++i) {
rgn->op(randRect(rand), SkRegion::kUnion_Op);
}
}
static bool slow_contains(const SkRegion& outer, const SkRegion& inner) {
SkRegion tmp;
tmp.op(outer, inner, SkRegion::kUnion_Op);
return outer == tmp;
}
static bool slow_contains(const SkRegion& outer, const SkIRect& r) {
SkRegion tmp;
tmp.op(outer, SkRegion(r), SkRegion::kUnion_Op);
return outer == tmp;
}
static bool slow_intersects(const SkRegion& outer, const SkRegion& inner) {
SkRegion tmp;
return tmp.op(outer, inner, SkRegion::kIntersect_Op);
}
static void test_contains_iter(skiatest::Reporter* reporter, const SkRegion& rgn) {
SkRegion::Iterator iter(rgn);
while (!iter.done()) {
SkIRect r = iter.rect();
REPORTER_ASSERT(reporter, rgn.contains(r));
r.inset(-1, -1);
REPORTER_ASSERT(reporter, !rgn.contains(r));
iter.next();
}
}
static void contains_proc(skiatest::Reporter* reporter,
const SkRegion& a, const SkRegion& b) {
// test rgn
bool c0 = a.contains(b);
bool c1 = slow_contains(a, b);
REPORTER_ASSERT(reporter, c0 == c1);
// test rect
SkIRect r = a.getBounds();
r.inset(r.width()/4, r.height()/4);
c0 = a.contains(r);
c1 = slow_contains(a, r);
REPORTER_ASSERT(reporter, c0 == c1);
test_contains_iter(reporter, a);
test_contains_iter(reporter, b);
}
static void test_intersects_iter(skiatest::Reporter* reporter, const SkRegion& rgn) {
SkRegion::Iterator iter(rgn);
while (!iter.done()) {
SkIRect r = iter.rect();
REPORTER_ASSERT(reporter, rgn.intersects(r));
r.inset(-1, -1);
REPORTER_ASSERT(reporter, rgn.intersects(r));
iter.next();
}
}
static void intersects_proc(skiatest::Reporter* reporter,
const SkRegion& a, const SkRegion& b) {
bool c0 = a.intersects(b);
bool c1 = slow_intersects(a, b);
REPORTER_ASSERT(reporter, c0 == c1);
test_intersects_iter(reporter, a);
test_intersects_iter(reporter, b);
}
static void test_proc(skiatest::Reporter* reporter,
void (*proc)(skiatest::Reporter*,
const SkRegion& a, const SkRegion&)) {
SkRandom rand;
for (int i = 0; i < 10000; ++i) {
SkRegion outer;
randRgn(rand, &outer, 8);
SkRegion inner;
randRgn(rand, &inner, 2);
proc(reporter, outer, inner);
}
}
static void rand_rect(SkIRect* rect, SkRandom& rand) {
int bits = 6;
int shift = 32 - bits;
rect->set(rand.nextU() >> shift, rand.nextU() >> shift,
rand.nextU() >> shift, rand.nextU() >> shift);
rect->sort();
}
static bool test_rects(const SkIRect rect[], int count) {
SkRegion rgn0, rgn1;
for (int i = 0; i < count; i++) {
rgn0.op(rect[i], SkRegion::kUnion_Op);
}
rgn1.setRects(rect, count);
if (rgn0 != rgn1) {
SkDebugf("\n");
for (int i = 0; i < count; i++) {
SkDebugf(" { %d, %d, %d, %d },\n",
rect[i].fLeft, rect[i].fTop,
rect[i].fRight, rect[i].fBottom);
}
SkDebugf("\n");
return false;
}
return true;
}
static void TestRegion(skiatest::Reporter* reporter) {
const SkIRect r2[] = {
{ 0, 0, 1, 1 },
{ 2, 2, 3, 3 },
};
REPORTER_ASSERT(reporter, test_rects(r2, SK_ARRAY_COUNT(r2)));
const SkIRect rects[] = {
{ 0, 0, 1, 2 },
{ 2, 1, 3, 3 },
{ 4, 0, 5, 1 },
{ 6, 0, 7, 4 },
};
REPORTER_ASSERT(reporter, test_rects(rects, SK_ARRAY_COUNT(rects)));
SkRandom rand;
for (int i = 0; i < 1000; i++) {
SkRegion rgn0, rgn1;
const int N = 8;
SkIRect rect[N];
for (int j = 0; j < N; j++) {
rand_rect(&rect[j], rand);
}
REPORTER_ASSERT(reporter, test_rects(rect, N));
}
test_proc(reporter, contains_proc);
test_proc(reporter, intersects_proc);
test_empties(reporter);
test_fromchrome(reporter);
}
#include "TestClassDef.h"
DEFINE_TESTCLASS("Region", RegionTestClass, TestRegion)
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