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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 "SkDeque.h"
#include "Test.h"
static void assert_count(skiatest::Reporter* reporter, const SkDeque& deq, int count) {
if (0 == count) {
REPORTER_ASSERT(reporter, deq.empty());
REPORTER_ASSERT(reporter, 0 == deq.count());
REPORTER_ASSERT(reporter, sizeof(int) == deq.elemSize());
REPORTER_ASSERT(reporter, nullptr == deq.front());
REPORTER_ASSERT(reporter, nullptr == deq.back());
} else {
REPORTER_ASSERT(reporter, !deq.empty());
REPORTER_ASSERT(reporter, count == deq.count());
REPORTER_ASSERT(reporter, sizeof(int) == deq.elemSize());
REPORTER_ASSERT(reporter, deq.front());
REPORTER_ASSERT(reporter, deq.back());
if (1 == count) {
REPORTER_ASSERT(reporter, deq.back() == deq.front());
} else {
REPORTER_ASSERT(reporter, deq.back() != deq.front());
}
}
}
static void assert_iter(skiatest::Reporter* reporter, const SkDeque& deq,
int max, int min) {
// test forward iteration
SkDeque::Iter iter(deq, SkDeque::Iter::kFront_IterStart);
void* ptr;
int value = max;
while ((ptr = iter.next())) {
REPORTER_ASSERT(reporter, value == *(int*)ptr);
value -= 1;
}
REPORTER_ASSERT(reporter, value+1 == min);
// test reverse iteration
iter.reset(deq, SkDeque::Iter::kBack_IterStart);
value = min;
while ((ptr = iter.prev())) {
REPORTER_ASSERT(reporter, value == *(int*)ptr);
value += 1;
}
REPORTER_ASSERT(reporter, value-1 == max);
// test mixed iteration
iter.reset(deq, SkDeque::Iter::kFront_IterStart);
value = max;
// forward iteration half-way
for (int i = 0; i < deq.count()/2 && (ptr = iter.next()); i++) {
REPORTER_ASSERT(reporter, value == *(int*)ptr);
value -= 1;
}
// then back down w/ reverse iteration
while ((ptr = iter.prev())) {
REPORTER_ASSERT(reporter, value == *(int*)ptr);
value += 1;
}
REPORTER_ASSERT(reporter, value-1 == max);
}
// This helper is intended to only give the unit test access to SkDeque's
// private numBlocksAllocated method
class DequeUnitTestHelper {
public:
int fNumBlocksAllocated;
DequeUnitTestHelper(const SkDeque& deq) {
fNumBlocksAllocated = deq.numBlocksAllocated();
}
};
static void assert_blocks(skiatest::Reporter* reporter,
const SkDeque& deq,
int allocCount) {
DequeUnitTestHelper helper(deq);
if (0 == deq.count()) {
REPORTER_ASSERT(reporter, 1 == helper.fNumBlocksAllocated);
} else {
int expected = (deq.count() + allocCount - 1) / allocCount;
// A block isn't freed in the deque when it first becomes empty so
// sometimes an extra block lingers around
REPORTER_ASSERT(reporter,
expected == helper.fNumBlocksAllocated ||
expected+1 == helper.fNumBlocksAllocated);
}
}
static void TestSub(skiatest::Reporter* reporter, int allocCount) {
SkDeque deq(sizeof(int), allocCount);
int i;
// test pushing on the front
assert_count(reporter, deq, 0);
for (i = 1; i <= 10; i++) {
*(int*)deq.push_front() = i;
}
assert_count(reporter, deq, 10);
assert_iter(reporter, deq, 10, 1);
assert_blocks(reporter, deq, allocCount);
for (i = 0; i < 5; i++) {
deq.pop_front();
}
assert_count(reporter, deq, 5);
assert_iter(reporter, deq, 5, 1);
assert_blocks(reporter, deq, allocCount);
for (i = 0; i < 5; i++) {
deq.pop_front();
}
assert_count(reporter, deq, 0);
assert_blocks(reporter, deq, allocCount);
// now test pushing on the back
for (i = 10; i >= 1; --i) {
*(int*)deq.push_back() = i;
}
assert_count(reporter, deq, 10);
assert_iter(reporter, deq, 10, 1);
assert_blocks(reporter, deq, allocCount);
for (i = 0; i < 5; i++) {
deq.pop_back();
}
assert_count(reporter, deq, 5);
assert_iter(reporter, deq, 10, 6);
assert_blocks(reporter, deq, allocCount);
for (i = 0; i < 5; i++) {
deq.pop_back();
}
assert_count(reporter, deq, 0);
assert_blocks(reporter, deq, allocCount);
// now test pushing/popping on both ends
*(int*)deq.push_front() = 5;
*(int*)deq.push_back() = 4;
*(int*)deq.push_front() = 6;
*(int*)deq.push_back() = 3;
*(int*)deq.push_front() = 7;
*(int*)deq.push_back() = 2;
*(int*)deq.push_front() = 8;
*(int*)deq.push_back() = 1;
assert_count(reporter, deq, 8);
assert_iter(reporter, deq, 8, 1);
assert_blocks(reporter, deq, allocCount);
}
DEF_TEST(Deque, reporter) {
// test it once with the default allocation count
TestSub(reporter, 1);
// test it again with a generous allocation count
TestSub(reporter, 10);
}
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