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LibGfx: Re-structure the whole initialization pattern for image decoders

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When trying to figure out the correct implementation, we now have a very
strong distinction on plugins that are well suited for sniffing, and
plugins that need a MIME type to be chosen.

Instead of having multiple calls to non-static virtual sniff methods for
each Image decoding plugin, we have 2 static methods for each
implementation:
1. The sniff method, which in contrast to the old method, gets a
    ReadonlyBytes parameter and ensures we can figure out the result
    with zero heap allocations for most implementations.
2. The create method, which just creates a new instance so we don't
    expose the constructor to everyone anymore.

In addition to that, we have a new virtual method called initialize,
which has a per-implementation initialization pattern to actually ensure
each implementation can construct a decoder object, and then have a
correct context being applied to it for the actual decoding.
This commit is contained in:
Liav A 2023-01-20 10:13:14 +02:00 • committed by Linus Groh
parent 6e6999ce57
commit 57e19a7e56
33 changed files with 493 additions and 206 deletions
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24
Userland/Libraries/LibGfx/BMPLoader.cpp
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@ -1400,12 +1400,12 @@ static ErrorOr<void> decode_bmp_pixel_data(BMPLoadingContext& context)
return {};
}
BMPImageDecoderPlugin::BMPImageDecoderPlugin(u8 const* data, size_t data_size, bool is_included_in_ico)
BMPImageDecoderPlugin::BMPImageDecoderPlugin(u8 const* data, size_t data_size, IncludedInICO is_included_in_ico)
{
m_context = make<BMPLoadingContext>();
m_context->file_bytes = data;
m_context->file_size = data_size;
m_context->is_included_in_ico = is_included_in_ico;
m_context->is_included_in_ico = (is_included_in_ico == IncludedInICO::Yes);
}
BMPImageDecoderPlugin::~BMPImageDecoderPlugin() = default;
@ -1434,11 +1434,29 @@ bool BMPImageDecoderPlugin::set_nonvolatile(bool& was_purged)
return m_context->bitmap->set_nonvolatile(was_purged);
}
bool BMPImageDecoderPlugin::sniff()
bool BMPImageDecoderPlugin::initialize()
{
return !decode_bmp_header(*m_context).is_error();
}
ErrorOr<bool> BMPImageDecoderPlugin::sniff(ReadonlyBytes data)
{
BMPLoadingContext context;
context.file_bytes = data.data();
context.file_size = data.size();
return !decode_bmp_header(context).is_error();
}
ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> BMPImageDecoderPlugin::create(ReadonlyBytes data)
{
return adopt_nonnull_own_or_enomem(new (nothrow) BMPImageDecoderPlugin(data.data(), data.size()));
}
ErrorOr<NonnullOwnPtr<BMPImageDecoderPlugin>> BMPImageDecoderPlugin::create_as_included_in_ico(Badge<ICOImageDecoderPlugin>, ReadonlyBytes data)
{
return adopt_nonnull_own_or_enomem(new (nothrow) BMPImageDecoderPlugin(data.data(), data.size(), IncludedInICO::Yes));
}
bool BMPImageDecoderPlugin::sniff_dib()
{
return !decode_bmp_dib(*m_context).is_error();