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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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18
Userland/Services/SpiceAgent/SpiceAgent.cpp
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@ -142,11 +142,23 @@ void SpiceAgent::on_message_received()
} else {
ErrorOr<Gfx::ImageFrameDescriptor> frame_or_error = Gfx::ImageFrameDescriptor {};
if (type == ClipboardType::PNG) {
frame_or_error = Gfx::PNGImageDecoderPlugin(data_buffer.data(), data_buffer.size()).frame(0);
if (Gfx::PNGImageDecoderPlugin::sniff({ data_buffer.data(), data_buffer.size() }).release_value_but_fixme_should_propagate_errors()) {
auto png_decoder = Gfx::PNGImageDecoderPlugin::create({ data_buffer.data(), data_buffer.size() }).release_value_but_fixme_should_propagate_errors();
if (png_decoder->initialize())
frame_or_error = png_decoder->frame(0);
}
} else if (type == ClipboardType::BMP) {
frame_or_error = Gfx::BMPImageDecoderPlugin(data_buffer.data(), data_buffer.size()).frame(0);
if (Gfx::BMPImageDecoderPlugin::sniff({ data_buffer.data(), data_buffer.size() }).release_value_but_fixme_should_propagate_errors()) {
auto bmp_decoder = Gfx::BMPImageDecoderPlugin::create({ data_buffer.data(), data_buffer.size() }).release_value_but_fixme_should_propagate_errors();
if (bmp_decoder->initialize())
frame_or_error = bmp_decoder->frame(0);
}
} else if (type == ClipboardType::JPG) {
frame_or_error = Gfx::JPGImageDecoderPlugin(data_buffer.data(), data_buffer.size()).frame(0);
if (Gfx::JPGImageDecoderPlugin::sniff({ data_buffer.data(), data_buffer.size() }).release_value_but_fixme_should_propagate_errors()) {
auto jpg_decoder = Gfx::JPGImageDecoderPlugin::create({ data_buffer.data(), data_buffer.size() }).release_value_but_fixme_should_propagate_errors();
if (jpg_decoder->initialize())
frame_or_error = jpg_decoder->frame(0);
}
} else {
dbgln("Unknown clipboard type: {}", (u32)type);
return;