scroggo | 8e6c7ad | 2016-09-16 08:20:38 -0700 | [diff] [blame^] | 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 "SkBitmap.h" |
| 9 | #include "SkCodec.h" |
| 10 | #include "SkData.h" |
| 11 | #include "SkImageInfo.h" |
| 12 | #include "SkRWBuffer.h" |
| 13 | #include "SkString.h" |
| 14 | |
| 15 | #include "Resources.h" |
| 16 | #include "Test.h" |
| 17 | |
| 18 | static sk_sp<SkData> make_from_resource(const char* name) { |
| 19 | SkString fullPath = GetResourcePath(name); |
| 20 | return SkData::MakeFromFileName(fullPath.c_str()); |
| 21 | } |
| 22 | |
| 23 | static SkImageInfo standardize_info(SkCodec* codec) { |
| 24 | SkImageInfo defaultInfo = codec->getInfo(); |
| 25 | // Note: This drops the SkColorSpace, allowing the equality check between two |
| 26 | // different codecs created from the same file to have the same SkImageInfo. |
| 27 | return SkImageInfo::MakeN32Premul(defaultInfo.width(), defaultInfo.height()); |
| 28 | } |
| 29 | |
| 30 | static bool create_truth(sk_sp<SkData> data, SkBitmap* dst) { |
| 31 | SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(std::move(data))); |
| 32 | if (!codec) { |
| 33 | return false; |
| 34 | } |
| 35 | |
| 36 | const SkImageInfo info = standardize_info(codec); |
| 37 | dst->allocPixels(info); |
| 38 | return SkCodec::kSuccess == codec->getPixels(info, dst->getPixels(), dst->rowBytes()); |
| 39 | } |
| 40 | |
| 41 | /* |
| 42 | * Represents a stream without all of its data. |
| 43 | */ |
| 44 | class HaltingStream : public SkStream { |
| 45 | public: |
| 46 | HaltingStream(sk_sp<SkData> data) |
| 47 | : fTotalSize(data->size()) |
| 48 | , fLimit(fTotalSize / 2) |
| 49 | , fStream(std::move(data)) |
| 50 | {} |
| 51 | |
| 52 | void addNewData() { |
| 53 | // Arbitrary size, but deliberately different from |
| 54 | // the buffer size used by SkPngCodec. |
| 55 | fLimit = SkTMin(fTotalSize, fLimit + 1000); |
| 56 | } |
| 57 | |
| 58 | size_t read(void* buffer, size_t size) override { |
| 59 | if (fStream.getPosition() + size > fLimit) { |
| 60 | size = fLimit - fStream.getPosition(); |
| 61 | } |
| 62 | |
| 63 | return fStream.read(buffer, size); |
| 64 | } |
| 65 | |
| 66 | bool isAtEnd() const override { |
| 67 | return fStream.isAtEnd(); |
| 68 | } |
| 69 | |
| 70 | bool hasPosition() const override { return true; } |
| 71 | size_t getPosition() const override { return fStream.getPosition(); } |
| 72 | bool rewind() override { return fStream.rewind(); } |
| 73 | bool move(long offset) override { return fStream.move(offset); } |
| 74 | |
| 75 | private: |
| 76 | const size_t fTotalSize; |
| 77 | size_t fLimit; |
| 78 | SkMemoryStream fStream; |
| 79 | }; |
| 80 | |
| 81 | static void test_partial(skiatest::Reporter* r, const char* name) { |
| 82 | sk_sp<SkData> file = make_from_resource(name); |
| 83 | if (!file) { |
| 84 | SkDebugf("missing resource %s\n", name); |
| 85 | return; |
| 86 | } |
| 87 | |
| 88 | SkBitmap truth; |
| 89 | if (!create_truth(file, &truth)) { |
| 90 | ERRORF(r, "Failed to decode %s\n", name); |
| 91 | return; |
| 92 | } |
| 93 | |
| 94 | const size_t fileSize = file->size(); |
| 95 | |
| 96 | // Now decode part of the file |
| 97 | HaltingStream* stream = new HaltingStream(file); |
| 98 | |
| 99 | // Note that we cheat and hold on to a pointer to stream, though it is owned by |
| 100 | // partialCodec. |
| 101 | SkAutoTDelete<SkCodec> partialCodec(SkCodec::NewFromStream(stream)); |
| 102 | if (!partialCodec) { |
| 103 | // Technically, this could be a small file where half the file is not |
| 104 | // enough. |
| 105 | ERRORF(r, "Failed to create codec for %s", name); |
| 106 | return; |
| 107 | } |
| 108 | |
| 109 | const SkImageInfo info = standardize_info(partialCodec); |
| 110 | SkASSERT(info == truth.info()); |
| 111 | SkBitmap incremental; |
| 112 | incremental.allocPixels(info); |
| 113 | |
| 114 | const SkCodec::Result startResult = partialCodec->startIncrementalDecode(info, |
| 115 | incremental.getPixels(), incremental.rowBytes()); |
| 116 | if (startResult != SkCodec::kSuccess) { |
| 117 | ERRORF(r, "Failed to start incremental decode\n"); |
| 118 | return; |
| 119 | } |
| 120 | |
| 121 | while (true) { |
| 122 | const SkCodec::Result result = partialCodec->incrementalDecode(); |
| 123 | |
| 124 | if (stream->getPosition() == fileSize) { |
| 125 | REPORTER_ASSERT(r, result == SkCodec::kSuccess); |
| 126 | break; |
| 127 | } |
| 128 | |
| 129 | SkASSERT(stream->getPosition() < fileSize); |
| 130 | |
| 131 | REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput); |
| 132 | |
| 133 | // Append an arbitrary amount of data. |
| 134 | stream->addNewData(); |
| 135 | } |
| 136 | |
| 137 | // compare to original |
| 138 | for (int i = 0; i < info.height(); i++) { |
| 139 | REPORTER_ASSERT(r, !memcmp(truth.getAddr(0, 0), incremental.getAddr(0, 0), |
| 140 | info.minRowBytes())); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | DEF_TEST(Codec_partial, r) { |
| 145 | test_partial(r, "plane.png"); |
| 146 | test_partial(r, "plane_interlaced.png"); |
| 147 | test_partial(r, "yellow_rose.png"); |
| 148 | test_partial(r, "index8.png"); |
| 149 | test_partial(r, "color_wheel.png"); |
| 150 | test_partial(r, "mandrill_256.png"); |
| 151 | test_partial(r, "mandrill_32.png"); |
| 152 | test_partial(r, "arrow.png"); |
| 153 | test_partial(r, "randPixels.png"); |
| 154 | test_partial(r, "baby_tux.png"); |
| 155 | } |
| 156 | |
| 157 | // Test that calling getPixels when an incremental decode has been |
| 158 | // started (but not finished) makes the next call to incrementalDecode |
| 159 | // require a call to startIncrementalDecode. |
| 160 | static void test_interleaved(skiatest::Reporter* r, const char* name) { |
| 161 | sk_sp<SkData> file = make_from_resource(name); |
| 162 | SkAutoTDelete<SkCodec> partialCodec(SkCodec::NewFromStream( |
| 163 | new HaltingStream(std::move(file)))); |
| 164 | if (!partialCodec) { |
| 165 | ERRORF(r, "Failed to create codec for %s", name); |
| 166 | return; |
| 167 | } |
| 168 | |
| 169 | const SkImageInfo info = standardize_info(partialCodec); |
| 170 | SkBitmap incremental; |
| 171 | incremental.allocPixels(info); |
| 172 | |
| 173 | const SkCodec::Result startResult = partialCodec->startIncrementalDecode(info, |
| 174 | incremental.getPixels(), incremental.rowBytes()); |
| 175 | if (startResult != SkCodec::kSuccess) { |
| 176 | ERRORF(r, "Failed to start incremental decode\n"); |
| 177 | return; |
| 178 | } |
| 179 | |
| 180 | SkCodec::Result result = partialCodec->incrementalDecode(); |
| 181 | REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput); |
| 182 | |
| 183 | SkBitmap full; |
| 184 | full.allocPixels(info); |
| 185 | result = partialCodec->getPixels(info, full.getPixels(), full.rowBytes()); |
| 186 | REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput); |
| 187 | |
| 188 | // Now incremental decode will fail |
| 189 | result = partialCodec->incrementalDecode(); |
| 190 | REPORTER_ASSERT(r, result == SkCodec::kInvalidParameters); |
| 191 | } |
| 192 | |
| 193 | DEF_TEST(Codec_rewind, r) { |
| 194 | test_interleaved(r, "plane.png"); |
| 195 | test_interleaved(r, "plane_interlaced.png"); |
| 196 | } |