Index: third_party/WebKit/Source/platform/image-decoders/png/PNGImageDecoderTest.cpp |
diff --git a/third_party/WebKit/Source/platform/image-decoders/png/PNGImageDecoderTest.cpp b/third_party/WebKit/Source/platform/image-decoders/png/PNGImageDecoderTest.cpp |
index 5281c1ba065c9005ab9e27924de31e316852d74c..e84ddb6aa08cf78a45fb79a19b7e13e1f5e9f0e5 100644 |
--- a/third_party/WebKit/Source/platform/image-decoders/png/PNGImageDecoderTest.cpp |
+++ b/third_party/WebKit/Source/platform/image-decoders/png/PNGImageDecoderTest.cpp |
@@ -4,9 +4,28 @@ |
#include "platform/image-decoders/png/PNGImageDecoder.h" |
+#include <memory> |
#include "platform/image-decoders/ImageDecoderTestHelpers.h" |
+#include "png.h" |
#include "testing/gtest/include/gtest/gtest.h" |
-#include <memory> |
+ |
+// /LayoutTests/images/resources/png-animated-idat-part-of-animation.png |
+// is modified in multiple tests to simulate erroneous PNGs. As a reference, |
+// the table below shows how the file is structured. |
+// |
+// Offset | 8 33 95 133 172 210 241 279 314 352 422 |
+// ------------------------------------------------------------------------- |
+// Chunk | IHDR acTL fcTL IDAT fcTL fdAT fcTL fdAT fcTL fdAT IEND |
+// |
+// In between the acTL and fcTL there are two other chunks, PLTE and tRNS, but |
+// those are not specifically used in this test suite. The same holds for a |
+// tEXT chunk in between the last fdAT and IEND. |
+// |
+// In the current behavior of PNG image decoders, the 4 frames are detected when |
+// respectively 141, 249, 322 and 430 bytes are received. The first frame should |
+// be detected when the IDAT has been received, and non-first frames when the |
+// next fcTL or IEND chunk has been received. Note that all offsets are +8, |
+// because a chunk is identified by byte 4-7. |
namespace blink { |
@@ -37,21 +56,170 @@ void testSize(const char* pngFile, IntSize expectedSize) { |
EXPECT_EQ(expectedSize, decoder->size()); |
} |
+// Test whether querying for the size of the image works if we present the |
+// data byte by byte. |
+void testSizeByteByByte(const char* pngFile, |
+ size_t bytesNeededToDecodeSize, |
+ IntSize expectedSize) { |
+ auto decoder = createDecoder(); |
+ auto data = readFile(pngFile); |
+ ASSERT_FALSE(data->isEmpty()); |
+ ASSERT_LT(bytesNeededToDecodeSize, data->size()); |
+ |
+ const char* source = data->data(); |
+ RefPtr<SharedBuffer> partialData = SharedBuffer::create(); |
+ for (size_t length = 1; length <= bytesNeededToDecodeSize; length++) { |
+ partialData->append(source++, 1u); |
+ decoder->setData(partialData.get(), false); |
+ |
+ if (length < bytesNeededToDecodeSize) { |
+ EXPECT_FALSE(decoder->isSizeAvailable()); |
+ EXPECT_TRUE(decoder->size().isEmpty()); |
+ EXPECT_FALSE(decoder->failed()); |
+ } else { |
+ EXPECT_TRUE(decoder->isSizeAvailable()); |
+ EXPECT_EQ(expectedSize, decoder->size()); |
+ } |
+ } |
+ EXPECT_FALSE(decoder->failed()); |
+} |
+ |
+void writeUint32(uint32_t val, png_byte* data) { |
+ data[0] = val >> 24; |
+ data[1] = val >> 16; |
+ data[2] = val >> 8; |
+ data[3] = val; |
+} |
+ |
void testRepetitionCount(const char* pngFile, int expectedRepetitionCount) { |
auto decoder = createDecoderWithPngData(pngFile); |
- // Decoding the frame count sets the repetition count as well. |
+ // Decoding the frame count sets the number of repetitions as well. |
decoder->frameCount(); |
EXPECT_FALSE(decoder->failed()); |
EXPECT_EQ(expectedRepetitionCount, decoder->repetitionCount()); |
} |
+struct PublicFrameInfo { |
+ size_t duration; |
+ IntRect frameRect; |
+ ImageFrame::AlphaBlendSource alphaBlend; |
+ ImageFrame::DisposalMethod disposalMethod; |
+}; |
+ |
+// This is the frame data for the following PNG image: |
+// /LayoutTests/images/resources/png-animated-idat-part-of-animation.png |
+static PublicFrameInfo pngAnimatedFrameInfo[] = { |
+ {500, |
+ {IntPoint(0, 0), IntSize(5, 5)}, |
+ ImageFrame::BlendAtopBgcolor, |
+ ImageFrame::DisposeKeep}, |
+ {900, |
+ {IntPoint(1, 1), IntSize(3, 1)}, |
+ ImageFrame::BlendAtopBgcolor, |
+ ImageFrame::DisposeOverwriteBgcolor}, |
+ {2000, |
+ {IntPoint(1, 2), IntSize(3, 2)}, |
+ ImageFrame::BlendAtopPreviousFrame, |
+ ImageFrame::DisposeKeep}, |
+ {1500, |
+ {IntPoint(1, 2), IntSize(3, 1)}, |
+ ImageFrame::BlendAtopBgcolor, |
+ ImageFrame::DisposeKeep}, |
+}; |
+ |
+void compareFrameWithExpectation(const PublicFrameInfo& expected, |
+ ImageDecoder* decoder, |
+ size_t index) { |
+ EXPECT_EQ(expected.duration, decoder->frameDurationAtIndex(index)); |
+ |
+ const auto* frame = decoder->frameBufferAtIndex(index); |
+ ASSERT_TRUE(frame); |
+ |
+ EXPECT_EQ(expected.duration, frame->duration()); |
+ EXPECT_EQ(expected.frameRect, frame->originalFrameRect()); |
+ EXPECT_EQ(expected.disposalMethod, frame->getDisposalMethod()); |
+ EXPECT_EQ(expected.alphaBlend, frame->getAlphaBlendSource()); |
+} |
+ |
+// This function removes |length| bytes at |offset|, and then calls frameCount. |
+// It assumes the missing bytes should result in a failed decode because the |
+// parser jumps |length| bytes too far in the next chunk. |
+void testMissingDataBreaksDecoding(const char* pngFile, |
+ size_t offset, |
+ size_t length) { |
+ auto decoder = createDecoder(); |
+ auto data = readFile(pngFile); |
+ ASSERT_FALSE(data->isEmpty()); |
+ |
+ RefPtr<SharedBuffer> invalidData = SharedBuffer::create(data->data(), offset); |
+ invalidData->append(data->data() + offset + length, |
+ data->size() - offset - length); |
+ ASSERT_EQ(data->size() - length, invalidData->size()); |
+ |
+ decoder->setData(invalidData, true); |
+ decoder->frameCount(); |
+ EXPECT_TRUE(decoder->failed()); |
+} |
+ |
+// Verify that a decoder with a parse error converts to a static image. |
+static void expectStatic(ImageDecoder* decoder) { |
+ EXPECT_EQ(1u, decoder->frameCount()); |
+ EXPECT_FALSE(decoder->failed()); |
+ |
+ ImageFrame* frame = decoder->frameBufferAtIndex(0); |
+ ASSERT_NE(nullptr, frame); |
+ EXPECT_EQ(ImageFrame::FrameComplete, frame->getStatus()); |
+ EXPECT_FALSE(decoder->failed()); |
+ EXPECT_EQ(cAnimationNone, decoder->repetitionCount()); |
+} |
+ |
+// Decode up to the indicated fcTL offset and then provide an fcTL with the |
+// wrong chunk size (20 instead of 26). |
+void testInvalidFctlSize(const char* pngFile, |
+ size_t offsetFctl, |
+ size_t expectedFrameCount, |
+ bool shouldFail) { |
+ auto data = readFile(pngFile); |
+ ASSERT_FALSE(data->isEmpty()); |
+ |
+ auto decoder = createDecoder(); |
+ RefPtr<SharedBuffer> invalidData = |
+ SharedBuffer::create(data->data(), offsetFctl); |
+ |
+ // Test if this gives the correct frame count, before the fcTL is parsed. |
+ decoder->setData(invalidData, false); |
+ EXPECT_EQ(expectedFrameCount, decoder->frameCount()); |
+ ASSERT_FALSE(decoder->failed()); |
+ |
+ // Append the wrong size to the data stream |
+ png_byte sizeChunk[4]; |
+ writeUint32(20, sizeChunk); |
+ invalidData->append(reinterpret_cast<char*>(sizeChunk), 4u); |
+ |
+ // Skip the size in the original data, but provide a truncated fcTL, |
+ // which is 4B of tag, 20B of data and 4B of CRC, totalling 28B. |
+ invalidData->append(data->data() + offsetFctl + 4, 28u); |
+ // Append the rest of the data |
+ const size_t offsetPostFctl = offsetFctl + 38; |
+ invalidData->append(data->data() + offsetPostFctl, |
+ data->size() - offsetPostFctl); |
+ |
+ decoder->setData(invalidData, false); |
+ if (shouldFail) { |
+ EXPECT_EQ(expectedFrameCount, decoder->frameCount()); |
+ EXPECT_EQ(true, decoder->failed()); |
+ } else { |
+ expectStatic(decoder.get()); |
+ } |
+} |
+ |
// Verify that the decoder can successfully decode the first frame when |
// initially only half of the frame data is received, resulting in a partially |
// decoded image, and then the rest of the image data is received. Verify that |
// the bitmap hashes of the two stages are different. Also verify that the final |
// bitmap hash is equivalent to the hash when all data is provided at once. |
// |
-// This verifies that decoder correctly keeps track of where it stopped |
+// This verifies that the decoder correctly keeps track of where it stopped |
// decoding when the image was not yet fully received. |
void testProgressiveDecodingContinuesAfterFullData(const char* pngFile, |
size_t offsetMidFirstFrame) { |
@@ -60,7 +228,7 @@ void testProgressiveDecodingContinuesAfterFullData(const char* pngFile, |
auto decoderUpfront = createDecoder(); |
decoderUpfront->setData(fullData.get(), true); |
- EXPECT_GE(1u, decoderUpfront->frameCount()); |
+ EXPECT_GE(decoderUpfront->frameCount(), 1u); |
const ImageFrame* const frameUpfront = decoderUpfront->frameBufferAtIndex(0); |
ASSERT_EQ(ImageFrame::FrameComplete, frameUpfront->getStatus()); |
const unsigned hashUpfront = hashBitmap(frameUpfront->bitmap()); |
@@ -86,16 +254,11 @@ void testProgressiveDecodingContinuesAfterFullData(const char* pngFile, |
} |
// Modify the frame data bytes for frame |frameIndex| so that decoding fails. |
-// Parsing should work fine, and is checked with |expectedFrameCountBefore|. If |
-// the failure should invalidate the decoder, |expectFailure| should be set to |
-// true. If not, |expectedFrameCountAfter| should indicate the new frame count |
-// after the failure. |
+// Parsing should work fine, and is checked with |expectedFrameCount|. |
void testFailureDuringDecode(const char* file, |
size_t idatOffset, |
size_t frameIndex, |
- bool expectFailure, |
- size_t expectedFrameCountBefore, |
- size_t expectedFrameCountAfter = 0u) { |
+ size_t expectedFrameCount) { |
RefPtr<SharedBuffer> fullData = readFile(file); |
ASSERT_FALSE(fullData->isEmpty()); |
@@ -112,18 +275,664 @@ void testFailureDuringDecode(const char* file, |
auto decoder = createDecoder(); |
decoder->setData(data.get(), true); |
- EXPECT_EQ(expectedFrameCountBefore, decoder->frameCount()); |
+ EXPECT_EQ(expectedFrameCount, decoder->frameCount()); |
+ |
+ decoder->frameBufferAtIndex(frameIndex); |
+ ASSERT_EQ(true, decoder->failed()); |
- const ImageFrame* const frame = decoder->frameBufferAtIndex(frameIndex); |
- EXPECT_EQ(expectFailure, decoder->failed()); |
- if (!expectFailure) { |
- EXPECT_EQ(expectedFrameCountAfter, decoder->frameCount()); |
- EXPECT_EQ(ImageFrame::FrameEmpty, frame->getStatus()); |
- } |
+ EXPECT_EQ(expectedFrameCount, decoder->frameCount()); |
} |
} // Anonymous namespace |
+// Animated PNG Tests |
+ |
+TEST(AnimatedPNGTests, sizeTest) { |
+ testSize( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ IntSize(5, 5)); |
+ testSize( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-not-part-of-animation.png", |
+ IntSize(227, 35)); |
+} |
+ |
+TEST(AnimatedPNGTests, repetitionCountTest) { |
+ testRepetitionCount( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 6u); |
+ // This is an "animated" image with only one frame, that is, the IDAT is |
+ // ignored and there is one fdAT frame. so it should be considered |
+ // non-animated. |
+ testRepetitionCount( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-not-part-of-animation.png", |
+ cAnimationNone); |
+} |
+ |
+// Test if the decoded metdata corresponds to the defined expectations |
+TEST(AnimatedPNGTests, MetaDataTest) { |
+ const char* pngFile = |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"; |
+ constexpr size_t expectedFrameCount = 4; |
+ |
+ auto decoder = createDecoderWithPngData(pngFile); |
+ ASSERT_EQ(expectedFrameCount, decoder->frameCount()); |
+ for (size_t i = 0; i < expectedFrameCount; i++) { |
+ compareFrameWithExpectation(pngAnimatedFrameInfo[i], decoder.get(), i); |
+ } |
+} |
+ |
+TEST(AnimatedPNGTests, EmptyFrame) { |
+ const char* pngFile = "/LayoutTests/images/resources/empty-frame.png"; |
+ auto decoder = createDecoderWithPngData(pngFile); |
+ // Frame 0 is empty. Ensure that decoding frame 1 (which depends on frame 0) |
+ // fails (rather than crashing). |
+ EXPECT_EQ(2u, decoder->frameCount()); |
+ EXPECT_FALSE(decoder->failed()); |
+ |
+ ImageFrame* frame = decoder->frameBufferAtIndex(1); |
+ EXPECT_TRUE(decoder->failed()); |
+ ASSERT_NE(nullptr, frame); |
+ EXPECT_EQ(ImageFrame::FrameEmpty, frame->getStatus()); |
+} |
+ |
+TEST(AnimatedPNGTests, ByteByByteSizeAvailable) { |
+ testSizeByteByByte( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 141u, IntSize(5, 5)); |
+ testSizeByteByByte( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-not-part-of-animation.png", |
+ 79u, IntSize(227, 35)); |
+} |
+ |
+TEST(AnimatedPNGTests, ByteByByteMetaData) { |
+ const char* pngFile = |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"; |
+ constexpr size_t expectedFrameCount = 4; |
+ |
+ // These are the byte offsets where each frame should have been parsed. |
+ // It boils down to the offset of the first fcTL / IEND after the last |
+ // frame data chunk, plus 8 bytes for recognition. The exception on this is |
+ // the first frame, which is reported when its first framedata is seen. |
+ size_t frameOffsets[expectedFrameCount] = {141, 249, 322, 430}; |
+ |
+ auto decoder = createDecoder(); |
+ auto data = readFile(pngFile); |
+ ASSERT_FALSE(data->isEmpty()); |
+ size_t framesParsed = 0; |
+ |
+ const char* source = data->data(); |
+ RefPtr<SharedBuffer> partialData = SharedBuffer::create(); |
+ for (size_t length = 1; length <= frameOffsets[expectedFrameCount - 1]; |
+ length++) { |
+ partialData->append(source++, 1u); |
+ decoder->setData(partialData.get(), false); |
+ EXPECT_FALSE(decoder->failed()); |
+ if (length < frameOffsets[framesParsed]) { |
+ EXPECT_EQ(framesParsed, decoder->frameCount()); |
+ } else { |
+ ASSERT_EQ(framesParsed + 1, decoder->frameCount()); |
+ compareFrameWithExpectation(pngAnimatedFrameInfo[framesParsed], |
+ decoder.get(), framesParsed); |
+ framesParsed++; |
+ } |
+ } |
+ EXPECT_EQ(expectedFrameCount, decoder->frameCount()); |
+ EXPECT_FALSE(decoder->failed()); |
+} |
+ |
+TEST(AnimatedPNGTests, TestRandomFrameDecode) { |
+ testRandomFrameDecode(&createDecoder, |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 2u); |
+} |
+ |
+TEST(AnimatedPNGTests, TestDecodeAfterReallocation) { |
+ testDecodeAfterReallocatingData(&createDecoder, |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"); |
+} |
+ |
+TEST(AnimatedPNGTests, ProgressiveDecode) { |
+ testProgressiveDecoding(&createDecoder, |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 13u); |
+} |
+ |
+TEST(AnimatedPNGTests, ParseAndDecodeByteByByte) { |
+ testByteByByteDecode(&createDecoder, |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 4u, 6u); |
+} |
+ |
+TEST(AnimatedPNGTests, FailureDuringParsing) { |
+ // Test the first fcTL in the stream. Because no frame data has been set at |
+ // this point, the expected frame count is zero. 95 bytes is just before the |
+ // first fcTL chunk, at which the first frame is detected. This is before the |
+ // IDAT, so it should be treated as a static image. |
+ testInvalidFctlSize( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 95u, 0u, false); |
+ |
+ // Test for the third fcTL in the stream. This should see 1 frame before the |
+ // fcTL, and then fail when parsing it. |
+ testInvalidFctlSize( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 241u, 1u, true); |
+} |
+ |
+TEST(AnimatedPNGTests, ActlErrors) { |
+ const char* pngFile = |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"; |
+ auto data = readFile(pngFile); |
+ ASSERT_FALSE(data->isEmpty()); |
+ |
+ const size_t offsetActl = 33u; |
+ const size_t acTLSize = 20u; |
+ { |
+ // Remove the acTL chunk from the stream. This results in a static image. |
+ RefPtr<SharedBuffer> noActlData = |
+ SharedBuffer::create(data->data(), offsetActl); |
+ noActlData->append(data->data() + offsetActl + acTLSize, |
+ data->size() - offsetActl - acTLSize); |
+ |
+ auto decoder = createDecoder(); |
+ decoder->setData(noActlData, true); |
+ EXPECT_EQ(1u, decoder->frameCount()); |
+ EXPECT_FALSE(decoder->failed()); |
+ EXPECT_EQ(cAnimationNone, decoder->repetitionCount()); |
+ } |
+ |
+ // Store the acTL for more tests. |
+ char acTL[acTLSize]; |
+ memcpy(acTL, data->data() + offsetActl, acTLSize); |
+ |
+ // Insert an extra acTL at a couple of different offsets. |
+ // Prior to the IDAT, this should result in a static image. After, this |
+ // should fail. |
+ const struct { |
+ size_t offset; |
+ bool shouldFail; |
+ } gRecs[] = {{8u, false}, |
+ {offsetActl, false}, |
+ {133u, false}, |
+ {172u, true}, |
+ {422u, true}}; |
+ for (const auto& rec : gRecs) { |
+ const size_t offset = rec.offset; |
+ RefPtr<SharedBuffer> extraActlData = |
+ SharedBuffer::create(data->data(), offset); |
+ extraActlData->append(acTL, acTLSize); |
+ extraActlData->append(data->data() + offset, data->size() - offset); |
+ auto decoder = createDecoder(); |
+ decoder->setData(extraActlData, true); |
+ EXPECT_EQ(rec.shouldFail ? 0u : 1u, decoder->frameCount()); |
+ EXPECT_EQ(rec.shouldFail, decoder->failed()); |
+ } |
+ |
+ // An acTL after IDAT is ignored. |
+ pngFile = |
+ "/LayoutTests/images/resources/" |
+ "cHRM_color_spin.png"; |
+ { |
+ auto data2 = readFile(pngFile); |
+ ASSERT_FALSE(data2->isEmpty()); |
+ const size_t postIDATOffset = 30971u; |
+ for (size_t times = 0; times < 2; times++) { |
+ RefPtr<SharedBuffer> extraActlData = |
+ SharedBuffer::create(data2->data(), postIDATOffset); |
+ for (size_t i = 0; i < times; i++) |
+ extraActlData->append(acTL, acTLSize); |
+ extraActlData->append(data2->data() + postIDATOffset, |
+ data2->size() - postIDATOffset); |
+ |
+ auto decoder = createDecoder(); |
+ decoder->setData(extraActlData, true); |
+ EXPECT_EQ(1u, decoder->frameCount()); |
+ EXPECT_FALSE(decoder->failed()); |
+ EXPECT_EQ(cAnimationNone, decoder->repetitionCount()); |
+ EXPECT_NE(nullptr, decoder->frameBufferAtIndex(0)); |
+ EXPECT_FALSE(decoder->failed()); |
+ } |
+ } |
+} |
+ |
+TEST(AnimatedPNGTests, fdatBeforeIdat) { |
+ const char* pngFile = |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-not-part-of-animation.png"; |
+ auto data = readFile(pngFile); |
+ ASSERT_FALSE(data->isEmpty()); |
+ |
+ // Insert fcTL and fdAT prior to the IDAT |
+ const size_t idatOffset = 71u; |
+ RefPtr<SharedBuffer> modifiedData = |
+ SharedBuffer::create(data->data(), idatOffset); |
+ // Copy fcTL and fdAT |
+ const size_t fctlPlusFdatSize = 38u + 1566u; |
+ modifiedData->append(data->data() + 2519u, fctlPlusFdatSize); |
+ // Copy IDAT |
+ modifiedData->append(data->data() + idatOffset, 2448u); |
+ // Copy the remaining |
+ modifiedData->append(data->data() + 4123u, 39u + 12u); |
+ // Data has just been rearranged. |
+ ASSERT_EQ(data->size(), modifiedData->size()); |
+ |
+ { |
+ // This broken APNG will be treated as a static png. |
+ auto decoder = createDecoder(); |
+ decoder->setData(modifiedData.get(), true); |
+ expectStatic(decoder.get()); |
+ } |
+ |
+ { |
+ // Remove the acTL from the modified image. It now has fdAT before |
+ // IDAT, but no acTL, so fdAT should be ignored. |
+ const size_t offsetActl = 33u; |
+ const size_t acTLSize = 20u; |
+ RefPtr<SharedBuffer> modifiedData2 = |
+ SharedBuffer::create(modifiedData->data(), offsetActl); |
+ modifiedData2->append(modifiedData->data() + offsetActl + acTLSize, |
+ modifiedData->size() - offsetActl - acTLSize); |
+ auto decoder = createDecoder(); |
+ decoder->setData(modifiedData2.get(), true); |
+ expectStatic(decoder.get()); |
+ |
+ // Likewise, if an acTL follows the fdAT, it is ignored. |
+ const size_t insertionOffset = idatOffset + fctlPlusFdatSize - acTLSize; |
+ RefPtr<SharedBuffer> modifiedData3 = |
+ SharedBuffer::create(modifiedData2->data(), insertionOffset); |
+ modifiedData3->append(data->data() + offsetActl, acTLSize); |
+ modifiedData3->append(modifiedData2->data() + insertionOffset, |
+ modifiedData2->size() - insertionOffset); |
+ decoder = createDecoder(); |
+ decoder->setData(modifiedData3.get(), true); |
+ expectStatic(decoder.get()); |
+ } |
+} |
+ |
+TEST(AnimatedPNGTests, IdatSizeMismatch) { |
+ // The default image must fill the image |
+ const char* pngFile = |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"; |
+ auto data = readFile(pngFile); |
+ ASSERT_FALSE(data->isEmpty()); |
+ |
+ const size_t fctlOffset = 95u; |
+ RefPtr<SharedBuffer> modifiedData = |
+ SharedBuffer::create(data->data(), fctlOffset); |
+ const size_t fctlSize = 38u; |
+ png_byte fctl[fctlSize]; |
+ memcpy(fctl, data->data() + fctlOffset, fctlSize); |
+ // Set the height to a smaller value, so it does not fill the image. |
+ writeUint32(3, fctl + 16); |
+ // Correct the crc |
+ writeUint32(3210324191, fctl + 34); |
+ modifiedData->append((const char*)fctl, fctlSize); |
+ const size_t afterFctl = fctlOffset + fctlSize; |
+ modifiedData->append(data->data() + afterFctl, data->size() - afterFctl); |
+ |
+ auto decoder = createDecoder(); |
+ decoder->setData(modifiedData.get(), true); |
+ expectStatic(decoder.get()); |
+} |
+ |
+// Originally, the third frame has an offset of (1,2) and a size of (3,2). By |
+// changing the offset to (4,4), the frame rect is no longer within the image |
+// size of 5x5. This results in a failure. |
+TEST(AnimatedPNGTests, VerifyFrameOutsideImageSizeFails) { |
+ const char* pngFile = |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"; |
+ auto data = readFile(pngFile); |
+ auto decoder = createDecoder(); |
+ ASSERT_FALSE(data->isEmpty()); |
+ |
+ const size_t offsetThirdFctl = 241; |
+ RefPtr<SharedBuffer> modifiedData = |
+ SharedBuffer::create(data->data(), offsetThirdFctl); |
+ const size_t fctlSize = 38u; |
+ png_byte fctl[fctlSize]; |
+ memcpy(fctl, data->data() + offsetThirdFctl, fctlSize); |
+ // Modify offset and crc. |
+ writeUint32(4, fctl + 20u); |
+ writeUint32(4, fctl + 24u); |
+ writeUint32(3700322018, fctl + 34u); |
+ |
+ modifiedData->append(const_cast<const char*>(reinterpret_cast<char*>(fctl)), |
+ fctlSize); |
+ modifiedData->append(data->data() + offsetThirdFctl + fctlSize, |
+ data->size() - offsetThirdFctl - fctlSize); |
+ |
+ decoder->setData(modifiedData, true); |
+ |
+ IntSize expectedSize(5, 5); |
+ EXPECT_TRUE(decoder->isSizeAvailable()); |
+ EXPECT_EQ(expectedSize, decoder->size()); |
+ |
+ const size_t expectedFrameCount = 0; |
+ EXPECT_EQ(expectedFrameCount, decoder->frameCount()); |
+ EXPECT_TRUE(decoder->failed()); |
+} |
+ |
+TEST(AnimatedPNGTests, ProgressiveDecodingContinuesAfterFullData) { |
+ // 160u is a randomly chosen offset in the IDAT chunk of the first frame. |
+ testProgressiveDecodingContinuesAfterFullData( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 160u); |
+} |
+ |
+TEST(AnimatedPNGTests, RandomDecodeAfterClearFrameBufferCache) { |
+ testRandomDecodeAfterClearFrameBufferCache( |
+ &createDecoder, |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 2u); |
+} |
+ |
+TEST(AnimatedPNGTests, VerifyAlphaBlending) { |
+ testAlphaBlending(&createDecoder, |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"); |
+} |
+ |
+// This tests if the frame count gets set correctly when parsing frameCount |
+// fails in one of the parsing queries. |
+// |
+// First, enough data is provided such that two frames should be registered. |
+// The decoder should at this point not be in the failed status. |
+// |
+// Then, we provide the rest of the data except for the last IEND chunk, but |
+// tell the decoder that this is all the data we have. The frame count should |
+// be three, since one extra frame should be discovered. The fourth frame |
+// should *not* be registered since the reader should not be able to determine |
+// where the frame ends. The decoder should *not* be in the failed state since |
+// there are three frames which can be shown. |
+// Attempting to decode the third frame should fail, since the file is |
+// truncated. |
+TEST(AnimatedPNGTests, FailureMissingIendChunk) { |
+ RefPtr<SharedBuffer> fullData = readFile( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"); |
+ ASSERT_FALSE(fullData->isEmpty()); |
+ auto decoder = createDecoder(); |
+ |
+ const size_t offsetTwoFrames = 249; |
+ const size_t expectedFramesAfter249Bytes = 2; |
+ RefPtr<SharedBuffer> tempData = |
+ SharedBuffer::create(fullData->data(), offsetTwoFrames); |
+ decoder->setData(tempData.get(), false); |
+ EXPECT_EQ(expectedFramesAfter249Bytes, decoder->frameCount()); |
+ EXPECT_FALSE(decoder->failed()); |
+ |
+ // Provide the rest of the data except for the last IEND chunk. |
+ const size_t expectedFramesAfterAllExcept12Bytes = 3; |
+ tempData = SharedBuffer::create(fullData->data(), fullData->size() - 12); |
+ decoder->setData(tempData.get(), true); |
+ ASSERT_EQ(expectedFramesAfterAllExcept12Bytes, decoder->frameCount()); |
+ |
+ for (size_t i = 0; i < expectedFramesAfterAllExcept12Bytes; i++) { |
+ EXPECT_FALSE(decoder->failed()); |
+ decoder->frameBufferAtIndex(i); |
+ } |
+ |
+ EXPECT_TRUE(decoder->failed()); |
+} |
+ |
+TEST(AnimatedPNGTests, FailureDuringDecodingInvalidatesDecoder) { |
+ testFailureDuringDecode( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 291u, // fdat offset for frame index 2, plus 12 to move past sequence |
+ // number. |
+ 2u, // try to decode frame index 2 |
+ 4u); // expected frame count before failure |
+ |
+ testFailureDuringDecode( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 133u, // idat offset for frame index 0 |
+ 0u, // try to decode frame index 0 |
+ 4u); // expected frame count before failure |
+} |
+ |
+// Verify that a malformatted PNG, where the IEND appears before any frame data |
+// (IDAT), invalidates the decoder. |
+TEST(AnimatedPNGTests, VerifyIENDBeforeIDATInvalidatesDecoder) { |
+ RefPtr<SharedBuffer> fullData = readFile( |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"); |
+ ASSERT_FALSE(fullData->isEmpty()); |
+ auto decoder = createDecoder(); |
+ |
+ const size_t offsetIDAT = 133; |
+ RefPtr<SharedBuffer> data = |
+ SharedBuffer::create(fullData->data(), offsetIDAT); |
+ data->append(fullData->data() + fullData->size() - 12u, 12u); |
+ data->append(fullData->data() + offsetIDAT, fullData->size() - offsetIDAT); |
+ decoder->setData(data.get(), true); |
+ |
+ const size_t expectedFrameCount = 0u; |
+ EXPECT_EQ(expectedFrameCount, decoder->frameCount()); |
+ EXPECT_TRUE(decoder->failed()); |
+} |
+ |
+// All IDAT chunks must be before all fdAT chunks |
+TEST(AnimatedPNGTests, MixedDataChunks) { |
+ const char* pngFile = |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"; |
+ RefPtr<SharedBuffer> fullData = readFile(pngFile); |
+ ASSERT_FALSE(fullData->isEmpty()); |
+ |
+ // Add an extra fdAT after the first IDAT, skipping fcTL. |
+ const size_t postIDAT = 172u; |
+ RefPtr<SharedBuffer> data = SharedBuffer::create(fullData->data(), postIDAT); |
+ const size_t fcTLSize = 38u; |
+ const size_t fdATSize = 31u; |
+ png_byte fdAT[fdATSize]; |
+ memcpy(fdAT, fullData->data() + postIDAT + fcTLSize, fdATSize); |
+ // Modify the sequence number |
+ writeUint32(1u, fdAT + 8); |
+ data->append((const char*)fdAT, fdATSize); |
+ const size_t IENDOffset = 422u; |
+ data->append(fullData->data() + IENDOffset, fullData->size() - IENDOffset); |
+ auto decoder = createDecoder(); |
+ decoder->setData(data.get(), true); |
+ decoder->frameCount(); |
+ EXPECT_TRUE(decoder->failed()); |
+ |
+ // Insert an IDAT after an fdAT. |
+ const size_t postfdAT = postIDAT + fcTLSize + fdATSize; |
+ data = SharedBuffer::create(fullData->data(), postfdAT); |
+ const size_t IDATOffset = 133u; |
+ data->append(fullData->data() + IDATOffset, postIDAT - IDATOffset); |
+ // Append the rest. |
+ data->append(fullData->data() + postIDAT, fullData->size() - postIDAT); |
+ decoder = createDecoder(); |
+ decoder->setData(data.get(), true); |
+ decoder->frameCount(); |
+ EXPECT_TRUE(decoder->failed()); |
+} |
+ |
+// Verify that erroneous values for the disposal method and alpha blending |
+// cause the decoder to fail. |
+TEST(AnimatedPNGTests, VerifyInvalidDisposalAndBlending) { |
+ const char* pngFile = |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"; |
+ RefPtr<SharedBuffer> fullData = readFile(pngFile); |
+ ASSERT_FALSE(fullData->isEmpty()); |
+ auto decoder = createDecoder(); |
+ |
+ // The disposal byte in the frame control chunk is the 24th byte, alpha |
+ // blending the 25th. |offsetDisposalOp| is 241 bytes to get to the third |
+ // fctl chunk, 8 bytes to skip the length and tag bytes, and 24 bytes to get |
+ // to the disposal op. |
+ // |
+ // Write invalid values to the disposal and alpha blending byte, correct the |
+ // crc and append the rest of the buffer. |
+ const size_t offsetDisposalOp = 241 + 8 + 24; |
+ RefPtr<SharedBuffer> data = |
+ SharedBuffer::create(fullData->data(), offsetDisposalOp); |
+ png_byte disposalAndBlending[6u]; |
+ disposalAndBlending[0] = 7; |
+ disposalAndBlending[1] = 9; |
+ writeUint32(2408835439u, disposalAndBlending + 2u); |
+ data->append(reinterpret_cast<char*>(disposalAndBlending), 6u); |
+ data->append(fullData->data() + offsetDisposalOp + 6u, |
+ fullData->size() - offsetDisposalOp - 6u); |
+ |
+ decoder->setData(data.get(), true); |
+ decoder->frameCount(); |
+ ASSERT_TRUE(decoder->failed()); |
+} |
+ |
+// This test verifies that the following situation does not invalidate the |
+// decoder: |
+// - Frame 0 is decoded progressively, but there's not enough data to fully |
+// decode it. |
+// - The rest of the image data is received. |
+// - Frame X, with X > 0, and X does not depend on frame 0, is decoded. |
+// - Frame 0 is decoded. |
+// This is a tricky case since the decoder resets the png struct for each frame, |
+// and this test verifies that it does not break the decoding of frame 0, even |
+// though it already started in the first call. |
+TEST(AnimatedPNGTests, VerifySuccessfulFirstFrameDecodeAfterLaterFrame) { |
+ const char* pngFile = |
+ "/LayoutTests/images/resources/" |
+ "png-animated-three-independent-frames.png"; |
+ auto decoder = createDecoder(); |
+ auto fullData = readFile(pngFile); |
+ ASSERT_FALSE(fullData->isEmpty()); |
+ |
+ // 160u is a randomly chosen offset in the IDAT chunk of the first frame. |
+ const size_t middleFirstFrame = 160u; |
+ RefPtr<SharedBuffer> data = |
+ SharedBuffer::create(fullData->data(), middleFirstFrame); |
+ decoder->setData(data.get(), false); |
+ |
+ ASSERT_EQ(1u, decoder->frameCount()); |
+ ASSERT_EQ(ImageFrame::FramePartial, |
+ decoder->frameBufferAtIndex(0)->getStatus()); |
+ |
+ decoder->setData(fullData.get(), true); |
+ ASSERT_EQ(3u, decoder->frameCount()); |
+ ASSERT_EQ(ImageFrame::FrameComplete, |
+ decoder->frameBufferAtIndex(1)->getStatus()); |
+ // The point is that this call does not decode frame 0, which it won't do if |
+ // it does not have it as its required previous frame. |
+ ASSERT_EQ(kNotFound, |
+ decoder->frameBufferAtIndex(1)->requiredPreviousFrameIndex()); |
+ |
+ EXPECT_EQ(ImageFrame::FrameComplete, |
+ decoder->frameBufferAtIndex(0)->getStatus()); |
+ EXPECT_FALSE(decoder->failed()); |
+} |
+ |
+// If the decoder attempts to decode a non-first frame which is subset and |
+// independent, it needs to discard its png_struct so it can use a modified |
+// IHDR. Test this by comparing a decode of frame 1 after frame 0 to a decode |
+// of frame 1 without decoding frame 0. |
+TEST(AnimatedPNGTests, DecodeFromIndependentFrame) { |
+ const char* pngFile = |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png"; |
+ auto originalData = readFile(pngFile); |
+ ASSERT_FALSE(originalData->isEmpty()); |
+ |
+ // This file almost fits the bill. Modify it to dispose frame 0, making |
+ // frame 1 independent. |
+ const size_t kDisposeOffset = 127u; |
+ auto data = SharedBuffer::create(originalData->data(), kDisposeOffset); |
+ // 1 Corresponds to APNG_DISPOSE_OP_BACKGROUND |
+ const char one = '\001'; |
+ data->append(&one, 1u); |
+ // No need to modify the blend op |
+ data->append(originalData->data() + kDisposeOffset + 1, 1u); |
+ // Modify the CRC |
+ png_byte crc[4]; |
+ writeUint32(2226670956, crc); |
+ data->append(reinterpret_cast<const char*>(crc), 4u); |
+ data->append(originalData->data() + data->size(), |
+ originalData->size() - data->size()); |
+ ASSERT_EQ(originalData->size(), data->size()); |
+ |
+ auto decoder = createDecoder(); |
+ decoder->setData(data.get(), true); |
+ |
+ ASSERT_EQ(4u, decoder->frameCount()); |
+ ASSERT_FALSE(decoder->failed()); |
+ |
+ auto* frame = decoder->frameBufferAtIndex(0); |
+ ASSERT_TRUE(frame); |
+ ASSERT_EQ(ImageFrame::DisposeOverwriteBgcolor, frame->getDisposalMethod()); |
+ |
+ frame = decoder->frameBufferAtIndex(1); |
+ ASSERT_TRUE(frame); |
+ ASSERT_FALSE(decoder->failed()); |
+ ASSERT_NE(IntRect({}, decoder->size()), frame->originalFrameRect()); |
+ ASSERT_EQ(kNotFound, frame->requiredPreviousFrameIndex()); |
+ |
+ const auto hash = hashBitmap(frame->bitmap()); |
+ |
+ // Now decode starting from frame 1. |
+ decoder = createDecoder(); |
+ decoder->setData(data.get(), true); |
+ |
+ frame = decoder->frameBufferAtIndex(1); |
+ ASSERT_TRUE(frame); |
+ EXPECT_EQ(hash, hashBitmap(frame->bitmap())); |
+} |
+ |
+// If the first frame is subset from IHDR (only allowed if the first frame is |
+// not the default image), the decoder has to destroy the png_struct it used |
+// for parsing so it can use a modified IHDR. |
+TEST(AnimatedPNGTests, SubsetFromIHDR) { |
+ const char* pngFile = |
+ "/LayoutTests/images/resources/" |
+ "png-animated-idat-not-part-of-animation.png"; |
+ auto originalData = readFile(pngFile); |
+ ASSERT_FALSE(originalData->isEmpty()); |
+ |
+ const size_t fcTLOffset = 2519u; |
+ auto data = SharedBuffer::create(originalData->data(), fcTLOffset); |
+ |
+ const size_t fcTLSize = 38u; |
+ png_byte fcTL[fcTLSize]; |
+ memcpy(fcTL, originalData->data() + fcTLOffset, fcTLSize); |
+ // Modify to have a subset frame (yOffset 1, height 34 out of 35). |
+ writeUint32(34, fcTL + 16u); |
+ writeUint32(1, fcTL + 24u); |
+ writeUint32(3972842751, fcTL + 34u); |
+ data->append(reinterpret_cast<const char*>(fcTL), fcTLSize); |
+ |
+ // Append the rest of the data. |
+ // Note: If PNGImageDecoder changes to reject an image with too many |
+ // rows, the fdAT data will need to be modified as well. |
+ data->append(originalData->data() + fcTLOffset + fcTLSize, |
+ originalData->size() - data->size()); |
+ ASSERT_EQ(originalData->size(), data->size()); |
+ |
+ // This will test both byte by byte and using the full data, and compare. |
+ testByteByByteDecode(createDecoder, data.get(), 1, cAnimationNone); |
+} |
+ |
// Static PNG tests |
TEST(StaticPNGTests, repetitionCountTest) { |
@@ -144,6 +953,11 @@ TEST(StaticPNGTests, MetaDataTest) { |
EXPECT_EQ(expectedDuration, decoder->frameDurationAtIndex(0)); |
} |
+TEST(StaticPNGTests, InvalidIHDRChunk) { |
+ testMissingDataBreaksDecoding("/LayoutTests/images/resources/png-simple.png", |
+ 20u, 2u); |
+} |
+ |
TEST(StaticPNGTests, ProgressiveDecoding) { |
testProgressiveDecoding(&createDecoder, |
"/LayoutTests/images/resources/png-simple.png", 11u); |
@@ -159,20 +973,74 @@ TEST(StaticPNGTests, FailureDuringDecodingInvalidatesDecoder) { |
"/LayoutTests/images/resources/png-simple.png", |
85u, // idat offset for frame index 0 |
0u, // try to decode frame index 0 |
- true, // expect the decoder to be invalidated after the failure |
1u); // expected frame count before failure |
} |
-// For static images, frameIsCompleteAtIndex(0) should return true if and only |
-// if the frame is successfully decoded, not when it is fully received. |
-TEST(StaticPNGTests, VerifyFrameCompleteBehavior) { |
- auto decoder = |
- createDecoderWithPngData("/LayoutTests/images/resources/png-simple.png"); |
- EXPECT_EQ(1u, decoder->frameCount()); |
- EXPECT_FALSE(decoder->frameIsCompleteAtIndex(0)); |
- EXPECT_EQ(ImageFrame::FrameComplete, |
- decoder->frameBufferAtIndex(0)->getStatus()); |
- EXPECT_TRUE(decoder->frameIsCompleteAtIndex(0)); |
+TEST(PNGTests, VerifyFrameCompleteBehavior) { |
+ struct { |
+ const char* name; |
+ size_t expectedFrameCount; |
+ size_t offsetInFirstFrame; |
+ } gRecs[] = { |
+ {"/LayoutTests/images/resources/" |
+ "png-animated-three-independent-frames.png", |
+ 3u, 150u}, |
+ {"/LayoutTests/images/resources/" |
+ "png-animated-idat-part-of-animation.png", |
+ 4u, 160u}, |
+ |
+ {"/LayoutTests/images/resources/png-simple.png", 1u, 700u}, |
+ {"/LayoutTests/images/resources/lenna.png", 1u, 40000u}, |
+ }; |
+ for (const auto& rec : gRecs) { |
+ auto fullData = readFile(rec.name); |
+ ASSERT_TRUE(fullData.get()); |
+ |
+ // Create with enough data for part of the first frame. |
+ auto decoder = createDecoder(); |
+ auto data = SharedBuffer::create(fullData->data(), rec.offsetInFirstFrame); |
+ decoder->setData(data.get(), false); |
+ |
+ EXPECT_FALSE(decoder->frameIsCompleteAtIndex(0)); |
+ |
+ // Parsing the size is not enough to mark the frame as complete. |
+ EXPECT_TRUE(decoder->isSizeAvailable()); |
+ EXPECT_FALSE(decoder->frameIsCompleteAtIndex(0)); |
+ |
+ const auto partialFrameCount = decoder->frameCount(); |
+ EXPECT_EQ(1u, partialFrameCount); |
+ |
+ // Frame is not complete, even after decoding partially. |
+ EXPECT_FALSE(decoder->frameIsCompleteAtIndex(0)); |
+ auto* frame = decoder->frameBufferAtIndex(0); |
+ ASSERT_TRUE(frame); |
+ EXPECT_NE(ImageFrame::FrameComplete, frame->getStatus()); |
+ EXPECT_FALSE(decoder->frameIsCompleteAtIndex(0)); |
+ |
+ decoder->setData(fullData.get(), true); |
+ |
+ // With full data, parsing the size still does not mark a frame as |
+ // complete. |
+ EXPECT_TRUE(decoder->isSizeAvailable()); |
+ EXPECT_FALSE(decoder->frameIsCompleteAtIndex(0)); |
+ |
+ const auto frameCount = decoder->frameCount(); |
+ ASSERT_EQ(rec.expectedFrameCount, frameCount); |
+ |
+ if (frameCount > 1u) { |
+ // After parsing (the full file), all frames are complete. |
+ for (size_t i = 0; i < frameCount; ++i) |
+ EXPECT_TRUE(decoder->frameIsCompleteAtIndex(i)); |
+ } else { |
+ // A single frame image is not reported complete until decoding. |
+ EXPECT_FALSE(decoder->frameIsCompleteAtIndex(0)); |
+ } |
+ |
+ frame = decoder->frameBufferAtIndex(0); |
+ ASSERT_TRUE(frame); |
+ EXPECT_EQ(ImageFrame::FrameComplete, frame->getStatus()); |
+ EXPECT_TRUE(decoder->frameIsCompleteAtIndex(0)); |
+ } |
} |
}; // namespace blink |