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Flate Test tests if compression works

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-   Produce a compressable stream.
-   Assert compression ratio > 1
-   In verbose mode, print compression ratio.

R=mtklein@google.com

Author: halcanary@google.com

Review URL: https://codereview.chromium.org/464373002
This commit is contained in:
halcanary 2014-08-13 08:07:38 -07:00 committed by Commit bot
parent 2ed49a492b
commit fbd3576a18
1 changed files with 16 additions and 11 deletions
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27
tests/FlateTest.cpp
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@ -7,7 +7,6 @@
#include "SkData.h"
#include "SkFlate.h"
#include "SkRandom.h"
#include "SkStream.h"
#include "Test.h"
@ -26,12 +25,12 @@ public:
static const size_t kGetSizeKey = 0xDEADBEEF;
};
// Returns a deterministic data of the given size.
// Returns a deterministic data of the given size that should be
// very compressible.
static SkData* new_test_data(size_t dataSize) {
SkAutoTMalloc<uint8_t> testBuffer(dataSize);
SkRandom random(0);
for (size_t i = 0; i < dataSize; ++i) {
testBuffer[i] = random.nextU() & 0xFF;
testBuffer[i] = i % 64;
}
return SkData::NewFromMalloc(testBuffer.detach(), dataSize);
}
@ -60,12 +59,7 @@ static void TestFlate(skiatest::Reporter* reporter, SkMemoryStream* testStream,
dataSize) == 0);
}
// Assume there are two test sizes, big and small.
if (dataSize < 1024) {
REPORTER_ASSERT(reporter, compressed.getOffset() < 1024);
} else {
REPORTER_ASSERT(reporter, compressed.getOffset() > 1024);
}
size_t compressedSize = compressed.getOffset();
SkAutoDataUnref compressedData(compressed.copyToData());
testStream->setData(compressedData.get());
@ -79,7 +73,7 @@ static void TestFlate(skiatest::Reporter* reporter, SkMemoryStream* testStream,
if (inputSize == 0) {
inputSize = testStream->read(NULL, SkZeroSizeMemStream::kGetSizeKey);
}
REPORTER_ASSERT(reporter, compressedData->size() == inputSize);
REPORTER_ASSERT(reporter, compressedSize == inputSize);
if (compressedData->size() == inputSize) {
REPORTER_ASSERT(reporter, memcmp(testStream->getMemoryBase(),
compressedData->data(),
@ -94,6 +88,17 @@ static void TestFlate(skiatest::Reporter* reporter, SkMemoryStream* testStream,
uncompressedData->data(),
dataSize) == 0);
}
double compressionRatio = static_cast<double>(dataSize) / compressedSize;
// Assert that some compression took place.
REPORTER_ASSERT(reporter, compressionRatio > 1.2);
if (reporter->verbose()) {
SkDebugf("Flate Test: \t input size: " SK_SIZE_T_SPECIFIER
"\tcompressed size: " SK_SIZE_T_SPECIFIER
"\tratio: %.4g\n",
dataSize, compressedSize, compressionRatio);
}
}
DEF_TEST(Flate, reporter) {