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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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10
Meta/Lagom/Fuzzers/FuzzGIFLoader.cpp
View file

@ -13,14 +13,18 @@
extern "C" int LLVMFuzzerTestOneInput(uint8_t const* data, size_t size)
{
Gfx::GIFImageDecoderPlugin gif_decoder(data, size);
auto bitmap_or_error = gif_decoder.frame(0);
auto decoder_or_error = Gfx::GIFImageDecoderPlugin::create({ data, size });
if (decoder_or_error.is_error())
return 0;
auto decoder = decoder_or_error.release_value();
decoder->initialize();
auto& gif_decoder = *decoder;
auto bitmap_or_error = decoder->frame(0);
if (!bitmap_or_error.is_error()) {
auto const& bitmap = bitmap_or_error.value().image;
// Looks like a valid GIF. Try to load the other frames:
dbgln_if(GIF_DEBUG, "bitmap size: {}", bitmap->size());
dbgln_if(GIF_DEBUG, "codec size: {}", gif_decoder.size());
dbgln_if(GIF_DEBUG, "is_sniff: {}", gif_decoder.sniff());
dbgln_if(GIF_DEBUG, "is_animated: {}", gif_decoder.is_animated());
dbgln_if(GIF_DEBUG, "loop_count: {}", gif_decoder.loop_count());
dbgln_if(GIF_DEBUG, "frame_count: {}", gif_decoder.frame_count());