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1 /* | |
2 * Copyright 2016 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 "SkCodec.h" | |
9 #include "SkData.h" | |
10 #include "SkImageInfo.h" | |
11 #include "SkRWBuffer.h" | |
12 #include "SkString.h" | |
13 | |
14 #include "Resources.h" | |
15 #include "Test.h" | |
16 | |
17 static sk_sp<SkData> make_from_resource(const char* name) { | |
18 SkString fullPath = GetResourcePath(name); | |
19 return SkData::MakeFromFileName(fullPath.c_str()); | |
20 } | |
21 | |
22 static SkImageInfo standardize_info(SkCodec* codec) { | |
23 SkImageInfo defaultInfo = codec->getInfo(); | |
24 return SkImageInfo::MakeN32Premul(defaultInfo.width(), defaultInfo.height())
; | |
25 } | |
26 | |
27 static bool create_truth(sk_sp<SkData> data, SkBitmap* dst) { | |
28 SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(data.get())); | |
29 if (!codec) { | |
30 return false; | |
31 } | |
32 | |
33 const SkImageInfo info = standardize_info(codec); | |
34 dst->allocPixels(info); | |
35 return SkCodec::kSuccess == codec->getPixels(info, dst->getPixels(), dst->ro
wBytes()); | |
36 } | |
37 | |
38 /* | |
39 * Represents a stream without all of its data. | |
40 */ | |
41 class HaltingStream : public SkStream { | |
42 public: | |
43 HaltingStream(sk_sp<SkData> data) | |
44 : fTotalSize(data->size()) | |
45 , fLimit(fTotalSize / 2) | |
46 , fStream(std::move(data)) | |
47 {} | |
48 | |
49 void addNewData() { | |
50 // Arbitrary size, but deliberately different from | |
51 // the buffer size used by SkPngCodec. | |
52 fLimit = SkTMin(fTotalSize, fLimit + 1000); | |
53 } | |
54 | |
55 size_t read(void* buffer, size_t size) override { | |
56 if (fStream.getPosition() + size > fLimit) { | |
57 size = fLimit - fStream.getPosition(); | |
58 } | |
59 | |
60 return fStream.read(buffer, size); | |
61 } | |
62 | |
63 bool isAtEnd() const override { | |
64 return fStream.isAtEnd(); | |
65 } | |
66 | |
67 bool hasPosition() const override { return true; } | |
68 size_t getPosition() const override { return fStream.getPosition(); } | |
69 bool rewind() override { return fStream.rewind(); } | |
70 | |
71 private: | |
72 const size_t fTotalSize; | |
73 size_t fLimit; | |
74 SkMemoryStream fStream; | |
75 }; | |
76 | |
77 static void test_partial(skiatest::Reporter* r, const char* name) { | |
78 sk_sp<SkData> file = make_from_resource(name); | |
79 if (!file) { | |
80 SkDebugf("missing resource %s\n", name); | |
81 return; | |
82 } | |
83 | |
84 SkBitmap truth; | |
85 if (!create_truth(file, &truth)) { | |
86 ERRORF(r, "Failed to decode %s\n", name); | |
87 return; | |
88 } | |
89 | |
90 const size_t fileSize = file->size(); | |
91 | |
92 // Now decode part of the file | |
93 HaltingStream* stream = new HaltingStream(file); | |
94 | |
95 // Note that we cheat and hold on to a pointer to stream, though it is owned
by | |
96 // partialCodec. | |
97 SkAutoTDelete<SkCodec> partialCodec(SkCodec::NewFromStream(stream)); | |
98 if (!partialCodec) { | |
99 // Technically, this could be a small file where half the file is not | |
100 // enough. | |
101 ERRORF(r, "Failed to create codec for %s", name); | |
102 return; | |
103 } | |
104 | |
105 const SkImageInfo info = standardize_info(partialCodec); | |
106 SkASSERT(info == truth.info()); | |
107 SkBitmap incremental; | |
108 incremental.allocPixels(info); | |
109 | |
110 const SkCodec::Result startResult = partialCodec->startIncrementalDecode(inf
o, | |
111 incremental.getPixels(), incremental.rowBytes()); | |
112 if (startResult != SkCodec::kSuccess) { | |
113 ERRORF(r, "Failed to start incremental decode\n"); | |
114 return; | |
115 } | |
116 | |
117 while (true) { | |
118 const SkCodec::Result result = partialCodec->incrementalDecode(); | |
119 | |
120 if (stream->getPosition() == fileSize) { | |
121 REPORTER_ASSERT(r, result == SkCodec::kSuccess); | |
122 break; | |
123 } | |
124 | |
125 SkASSERT(stream->getPosition() < fileSize); | |
126 | |
127 REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput); | |
128 | |
129 // Append an arbitrary amount of data. | |
130 stream->addNewData(); | |
131 } | |
132 | |
133 // compare to original | |
134 for (int i = 0; i < info.height(); i++) { | |
135 REPORTER_ASSERT(r, !memcmp(truth.getAddr(0, 0), incremental.getAddr(0, 0
), | |
136 info.minRowBytes())); | |
137 } | |
138 } | |
139 | |
140 DEF_TEST(Codec_partial, r) { | |
141 test_partial(r, "plane.png"); | |
142 test_partial(r, "plane_interlaced.png"); | |
143 test_partial(r, "yellow_rose.png"); | |
144 test_partial(r, "index8.png"); | |
145 test_partial(r, "color_wheel.png"); | |
146 test_partial(r, "mandrill_256.png"); | |
147 test_partial(r, "mandrill_32.png"); | |
148 test_partial(r, "arrow.png"); | |
149 test_partial(r, "randPixels.png"); | |
150 test_partial(r, "baby_tux.png"); | |
151 } | |
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