iPhone HEIC images fail to load

Hi Dirk,

Many thanks for providing the browser-based documentation. Thanks to it, I was finally able to start working on my project. The initial version of the documentation did not contain an example for working with user-provided images, so I added that functionality myself. Unfortunately, the page errors out when I try to load a HEIC photo I took with an iPhone.

That was maybe a month ago. When I went to check the documentation again this morning, I saw that you added the image upload functionality to the repo in the meantime, however it also fails to load iPhone HEIC photos (although it does not throw any error in the console like my code does, the image doesn’t get rendered).

Is this a known limitation of magick-wasm? I was hoping that it would be able to work with HEIC photos thanks to libheif. I can load example.heic image from libheif without any issue, but other heic photos just won’t render with magick-wasm, even though they render fine on libheif’s online demo page.

[dlemstra]

I already suspected this when I created this message but it turns out the for the heif library multi threading was enabled but this is not supported. I will need to make a change for this in the Magick.Native library but I was already able to seen the snowy picture that was posted by @jankais3r. This issue will be resolved in the next release.

[dlemstra]

Managed to get a bit more info by creating a debug build. And I am getting the following output:

$std::__2::__throw_system_error(int, char const*)	@	1d69f4e6:0x2a87cad
$std::__2::thread::thread<void (std::__2::__async_assoc_state<heif::Error, std::__2::__async_func<heif::Error (heif::HeifContext::*)(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int) const, heif::HeifContext const*, unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int>>::*)(), std::__2::__async_assoc_state<heif::Error, std::__2::__async_func<heif::Error (heif::HeifContext::*)(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int) const, heif::HeifContext const*, unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int>>*, void>(void (std::__2::__async_assoc_state<heif::Error, std::__2::__async_func<heif::Error (heif::HeifContext::*)(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int) const, heif::HeifContext const*, unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int>>::*&&)(), std::__2::__async_assoc_state<heif::Error, std::__2::__async_func<heif::Error (heif::HeifContext::*)(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int) const, heif::HeifContext const*, unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int>>*&&)	@	1d69f4e6:0x1f42402
$std::__2::future<heif::Error> std::__2::__make_async_assoc_state<heif::Error, std::__2::__async_func<heif::Error (heif::HeifContext::*)(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int) const, heif::HeifContext const*, unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int>>(std::__2::__async_func<heif::Error (heif::HeifContext::*)(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int) const, heif::HeifContext const*, unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int>&&)	@	1d69f4e6:0x1f2418e
$std::__2::future<std::__2::__invoke_of<std::__2::decay<heif::Error (heif::HeifContext::*)(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int) const>::type, std::__2::decay<heif::HeifContext const*>::type, std::__2::decay<unsigned int&>::type, std::__2::decay<std::__2::shared_ptr<heif::HeifPixelImage>&>::type, std::__2::decay<int&>::type, std::__2::decay<int&>::type>::type> std::__2::async<heif::Error (heif::HeifContext::*)(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int) const, heif::HeifContext const*, unsigned int&, std::__2::shared_ptr<heif::HeifPixelImage>&, int&, int&>(std::__2::launch, heif::Error (heif::HeifContext::*&&)(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>, int, int) const, heif::HeifContext const*&&, unsigned int&, std::__2::shared_ptr<heif::HeifPixelImage>&, int&, int&)	@	1d69f4e6:0x1f215dd
$heif::HeifContext::decode_full_grid_image(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>&, std::__2::vector<unsigned char, std::__2::allocator<unsigned char>> const&) const	@	1d69f4e6:0x1f1d6a3
$heif::HeifContext::decode_image_planar(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>&, heif_colorspace, heif_decoding_options const*) const	@	1d69f4e6:0x1f198de
$heif::HeifContext::decode_image_user(unsigned int, std::__2::shared_ptr<heif::HeifPixelImage>&, heif_colorspace, heif_chroma, heif_decoding_options const*) const	@	1d69f4e6:0x1f17a9c
$heif_decode_image	@	1d69f4e6:0x1ed0ea9
$ReadHEICImageHandle	@	1d69f4e6:0x775406
$ReadHEICImage	@	1d69f4e6:0x772ddb
$ReadImage	@	1d69f4e6:0xf70b9
$BlobToImage	@	1d69f4e6:0x777af
$MagickImage_ReadBlob