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skia2/tests/RegionTest.cpp
scroggo d49f48ddf7 Add test for SkRegion::writeToMemory. 
When calling SkRegion::writeToMemory(NULL), it should return the same
number of bytes that it writes when calling
SkRegion::writeToMemory(buffer). Add a test to confirm this.

BUG=b/21271229

Review URL: https://codereview.chromium.org/1188293002
2015-06-18 06:16:36 -07:00

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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 "SkPath.h"
#include "SkRandom.h"
#include "SkRegion.h"
#include "Test.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));
SkPath emptyPath;
emptyPath.moveTo(1, 5);
emptyPath.close();
SkRegion openClip;
openClip.setRect(-16000, -16000, 16000, 16000);
empty.setPath(emptyPath, openClip); // should not assert
}
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;
}
DEF_TEST(Region, 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);
}
// Test that writeToMemory reports the same number of bytes whether there was a
// buffer to write to or not.
static void test_write(const SkRegion& region, skiatest::Reporter* r) {
const size_t bytesNeeded = region.writeToMemory(NULL);
SkAutoMalloc storage(bytesNeeded);
const size_t bytesWritten = region.writeToMemory(storage.get());
REPORTER_ASSERT(r, bytesWritten == bytesNeeded);
}
DEF_TEST(Region_writeToMemory, r) {
// Test an empty region.
SkRegion region;
REPORTER_ASSERT(r, region.isEmpty());
test_write(region, r);
// Test a rectangular region
bool nonEmpty = region.setRect(0, 0, 50, 50);
REPORTER_ASSERT(r, nonEmpty);
REPORTER_ASSERT(r, region.isRect());
test_write(region, r);
// Test a complex region
nonEmpty = region.op(50, 50, 100, 100, SkRegion::kUnion_Op);
REPORTER_ASSERT(r, nonEmpty);
REPORTER_ASSERT(r, region.isComplex());
test_write(region, r);
}
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