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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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8
Userland/Libraries/LibGfx/QOILoader.h
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@ -40,13 +40,15 @@ struct QOILoadingContext {
class QOIImageDecoderPlugin final : public ImageDecoderPlugin {
public:
static ErrorOr<bool> sniff(ReadonlyBytes);
static ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> create(ReadonlyBytes);
virtual ~QOIImageDecoderPlugin() override = default;
QOIImageDecoderPlugin(u8 const*, size_t);
virtual IntSize size() override;
virtual void set_volatile() override;
[[nodiscard]] virtual bool set_nonvolatile(bool& was_purged) override;
virtual bool sniff() override;
virtual bool initialize() override;
virtual bool is_animated() override { return false; }
virtual size_t loop_count() override { return 0; }
virtual size_t frame_count() override { return 1; }
@ -56,6 +58,8 @@ private:
ErrorOr<void> decode_header_and_update_context(InputMemoryStream&);
ErrorOr<void> decode_image_and_update_context(InputMemoryStream&);
QOIImageDecoderPlugin(u8 const*, size_t);
OwnPtr<QOILoadingContext> m_context;
};