Chromium JXL regression test: incremental CMYK ICC metadata visibility (crbug.com/498155364)

jxl_cmyk_icc_regression_test.cc

// Source: chromium/src/third_party/blink/renderer/platform/image-decoders/jxl/jxl_image_decoder_test.cc
// Regression test for crbug.com/498155364.

// With incremental input, basic image info should not become observable before
// the embedded ICC profile is parsed.
TEST_F(JXLImageDecoderTest, DecodeCmykIccProfileIncrementalNoCrash) {
  scoped_refptr<SharedBuffer> full_data =
      ReadFileToSharedBuffer(kJxlTestDir, "conformance_cmyk_layers.jxl");
  ASSERT_TRUE(full_data);
  Vector<char> full_data_vec = full_data->CopyAs<Vector<char>>();
  ASSERT_GT(full_data_vec.size(), 0u);

  auto decoder = CreateJXLDecoder();
  constexpr wtf_size_t kChunkSize = 256;

  for (wtf_size_t chunk_end = kChunkSize;
       chunk_end < static_cast<wtf_size_t>(full_data_vec.size());
       chunk_end += kChunkSize) {
    scoped_refptr<SharedBuffer> partial_data =
        SharedBuffer::Create(base::span(full_data_vec).first(chunk_end));

    // Before the patch, this SetData() call could expose size/basic-info while
    // ICC metadata was still missing. Blink would then configure pixel format
    // early, which led to a Rust panic in the CMYK path.
    decoder->SetData(partial_data.get(), false);

    EXPECT_FALSE(decoder->Failed())
        << "Decoder failed during incremental CMYK+ICC metadata scan at "
        << chunk_end << " bytes";

    if (decoder->IsSizeAvailable()) {
      // This assertion captures the pre-patch bad state. Historically this
      // branch could be reached with HasEmbeddedColorProfile()==false, and the
      // next decode steps could crash.
      EXPECT_TRUE(decoder->HasEmbeddedColorProfile())
          << "Size became available before embedded ICC profile parsing "
             "completed";
    }
  }

  decoder->SetData(full_data.get(), true);
  EXPECT_TRUE(decoder->IsSizeAvailable());
  EXPECT_TRUE(decoder->HasEmbeddedColorProfile());

  ImageFrame* frame = decoder->DecodeFrameBufferAtIndex(0);
  ASSERT_TRUE(frame);
  EXPECT_EQ(ImageFrame::kFrameComplete, frame->GetStatus());
  EXPECT_TRUE(frame->HasAlpha());
  EXPECT_FALSE(decoder->Failed());
}