[Webkit-unassigned] [Bug 187582] New: Image is unexpectedly decoded

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187582

            Bug ID: 187582
           Summary: Image is unexpectedly decoded
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: yoshiaki.jitsukawa at sony.com

JavaScript code like
 var img = new Image();
 img.src = "foo.jpg";
unexpectedly gets the image decoded to a bitmap.

I've confirmed that JPEGImageDecoder::decode() was called with onlySize == false, using the GTK port.

The callstack is like as follows (Just a WebCore::Image::isNull() call caused decoding):

 WebCore::JPEGImageDecoder::decode(bool onlySize, bool allDataReceived)
 WebCore::JPEGImageDecoder::frameBufferAtIndex(size_t index)
 WebCore::ScalableImageDecoder::frameIsCompleteAtIndex(size_t index)
 WebCore::ImageSource::cacheMetadataAtIndex(size_t index, enum class
 WebCore::SubsamplingLevel subsamplingLevel, enum class WebCore::DecodingStatus decodingStatus)
 WebCore::ImageSource::frameAtIndexCacheIfNeeded(size_t index, enum class
WebCore::ImageFrame::Caching caching, const std::optional<WebCore::SubsamplingLevel>&
subsamplingLevel)
 WebCore::ImageSource::frameMetadataAtIndexCacheIfNeeded
 WebCore::ImageSource::size()
 WebCore::BitmapImage::size()
 WebCore::Image::isNull()

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