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| 1 /* | |
| 2 * Copyright 2011 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #include "SkData.h" | |
| 9 #include "SkDeflate.h" | |
| 10 #include "SkStream.h" | |
| 11 #include "Test.h" | |
| 12 | |
| 13 // A memory stream that reports zero size with the standard call, like | |
| 14 // an unseekable file stream would. | |
| 15 class SkZeroSizeMemStream : public SkMemoryStream { | |
| 16 public: | |
| 17 virtual size_t read(void* buffer, size_t size) { | |
| 18 if (buffer == NULL && size == 0) | |
| 19 return 0; | |
| 20 if (buffer == NULL && size == kGetSizeKey) | |
| 21 size = 0; | |
| 22 return SkMemoryStream::read(buffer, size); | |
| 23 } | |
| 24 | |
| 25 static const size_t kGetSizeKey = 0xDEADBEEF; | |
| 26 }; | |
| 27 | |
| 28 // Returns a deterministic data of the given size that should be | |
| 29 // very compressible. | |
| 30 static SkData* new_test_data(size_t dataSize) { | |
| 31 SkAutoTMalloc<uint8_t> testBuffer(dataSize); | |
| 32 for (size_t i = 0; i < dataSize; ++i) { | |
| 33 testBuffer[SkToInt(i)] = i % 64; | |
| 34 } | |
| 35 return SkData::NewFromMalloc(testBuffer.detach(), dataSize); | |
| 36 } | |
| 37 | |
| 38 static void TestFlate(skiatest::Reporter* reporter, SkMemoryStream* testStream, | |
| 39 size_t dataSize) { | |
| 40 SkASSERT(testStream != NULL); | |
| 41 | |
| 42 SkAutoDataUnref testData(new_test_data(dataSize)); | |
| 43 SkASSERT(testData->size() == dataSize); | |
| 44 | |
| 45 testStream->setMemory(testData->data(), dataSize, /*copyData=*/ true); | |
| 46 SkDynamicMemoryWStream compressed; | |
| 47 bool deflateSuccess = SkFlate::Deflate(testStream, &compressed); | |
| 48 REPORTER_ASSERT(reporter, deflateSuccess); | |
| 49 | |
| 50 // Check that the input data wasn't changed. | |
| 51 size_t inputSize = testStream->getLength(); | |
| 52 if (inputSize == 0) { | |
| 53 inputSize = testStream->read(NULL, SkZeroSizeMemStream::kGetSizeKey); | |
| 54 } | |
| 55 REPORTER_ASSERT(reporter, dataSize == inputSize); | |
| 56 if (dataSize == inputSize) { | |
| 57 REPORTER_ASSERT(reporter, memcmp(testData->data(), | |
| 58 testStream->getMemoryBase(), | |
| 59 dataSize) == 0); | |
| 60 } | |
| 61 | |
| 62 size_t compressedSize = compressed.getOffset(); | |
| 63 | |
| 64 SkAutoDataUnref compressedData(compressed.copyToData()); | |
| 65 testStream->setData(compressedData.get()); | |
| 66 | |
| 67 SkDynamicMemoryWStream uncompressed; | |
| 68 bool inflateSuccess = SkFlate::Inflate(testStream, &uncompressed); | |
| 69 REPORTER_ASSERT(reporter, inflateSuccess); | |
| 70 | |
| 71 // Check that the input data wasn't changed. | |
| 72 inputSize = testStream->getLength(); | |
| 73 if (inputSize == 0) { | |
| 74 inputSize = testStream->read(NULL, SkZeroSizeMemStream::kGetSizeKey); | |
| 75 } | |
| 76 REPORTER_ASSERT(reporter, compressedSize == inputSize); | |
| 77 if (compressedData->size() == inputSize) { | |
| 78 REPORTER_ASSERT(reporter, memcmp(testStream->getMemoryBase(), | |
| 79 compressedData->data(), | |
| 80 compressedData->size()) == 0); | |
| 81 } | |
| 82 | |
| 83 // Check that the uncompressed data matches the source data. | |
| 84 SkAutoDataUnref uncompressedData(uncompressed.copyToData()); | |
| 85 REPORTER_ASSERT(reporter, dataSize == uncompressedData->size()); | |
| 86 if (dataSize == uncompressedData->size()) { | |
| 87 REPORTER_ASSERT(reporter, memcmp(testData->data(), | |
| 88 uncompressedData->data(), | |
| 89 dataSize) == 0); | |
| 90 } | |
| 91 | |
| 92 if (compressedSize < 1) { return; } | |
| 93 | |
| 94 double compressionRatio = static_cast<double>(dataSize) / compressedSize; | |
| 95 // Assert that some compression took place. | |
| 96 REPORTER_ASSERT(reporter, compressionRatio > 1.2); | |
| 97 | |
| 98 if (reporter->verbose()) { | |
| 99 SkDebugf("Flate Test: \t input size: " SK_SIZE_T_SPECIFIER | |
| 100 "\tcompressed size: " SK_SIZE_T_SPECIFIER | |
| 101 "\tratio: %.4g\n", | |
| 102 dataSize, compressedSize, compressionRatio); | |
| 103 } | |
| 104 } | |
| 105 | |
| 106 DEF_TEST(Flate, reporter) { | |
| 107 SkMemoryStream memStream; | |
| 108 TestFlate(reporter, &memStream, 512); | |
| 109 TestFlate(reporter, &memStream, 10240); | |
| 110 | |
| 111 SkZeroSizeMemStream fileStream; | |
| 112 TestFlate(reporter, &fileStream, 512); | |
| 113 TestFlate(reporter, &fileStream, 10240); | |
| 114 } | |
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Chromium Code Reviews
Issue 1298243002:
SkPDF/Deflate: clean up old SkFlate code (Closed)
Base URL: https://skia.googlesource.com/skia.git@master