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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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11
Userland/Libraries/LibGUI/FileIconProvider.cpp
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@ -210,9 +210,14 @@ Icon FileIconProvider::icon_for_executable(DeprecatedString const& path)
bitmap = s_executable_icon.bitmap_for_size(icon_section.image_size);
} else {
// FIXME: Use the ImageDecoder service.
auto frame_or_error = Gfx::PNGImageDecoderPlugin(reinterpret_cast<u8 const*>(section->raw_data()), section->size()).frame(0);
if (!frame_or_error.is_error()) {
bitmap = frame_or_error.value().image;
if (Gfx::PNGImageDecoderPlugin::sniff({ section->raw_data(), section->size() }).release_value_but_fixme_should_propagate_errors()) {
auto png_decoder = Gfx::PNGImageDecoderPlugin::create({ section->raw_data(), section->size() }).release_value_but_fixme_should_propagate_errors();
if (png_decoder->initialize()) {
auto frame_or_error = png_decoder->frame(0);
if (!frame_or_error.is_error()) {
bitmap = frame_or_error.value().image;
}
}
}
}