RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-27 08:07:34 +00:00
Code Issues Activity Actions

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

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

11
Userland/Libraries/LibPDF/Filter.cpp
View file

@ -269,9 +269,14 @@ ErrorOr<ByteBuffer> Filter::decode_jbig2(ReadonlyBytes)
ErrorOr<ByteBuffer> Filter::decode_dct(ReadonlyBytes bytes)
{
Gfx::JPGImageDecoderPlugin decoder(bytes.data(), bytes.size());
auto frame = TRY(decoder.frame(0));
return frame.image->serialize_to_byte_buffer();
if (Gfx::JPGImageDecoderPlugin::sniff({ bytes.data(), bytes.size() }).release_value_but_fixme_should_propagate_errors()) {
auto decoder = Gfx::JPGImageDecoderPlugin::create({ bytes.data(), bytes.size() }).release_value_but_fixme_should_propagate_errors();
if (decoder->initialize()) {
auto frame = TRY(decoder->frame(0));
return frame.image->serialize_to_byte_buffer();
}
}
return AK::Error::from_string_literal("Not a JPG image!");
};
ErrorOr<ByteBuffer> Filter::decode_jpx(ReadonlyBytes)