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Side by Side Diff: tests/PDFFlateTest.cpp

Issue 1298243002: SkPDF/Deflate: clean up old SkFlate code (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: 2015-08-18 (Tuesday) 16:19:01 EDT Created 5 years, 4 months ago
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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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