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LibGfx: Improve ImageDecoder construction

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Previously, ImageDecoder::create() would return a NonnullRefPtr and
could not "fail", although the returned decoder may be "invalid" which
you then had to check anyway.

The new interface looks like this:

    static RefPtr<Gfx::ImageDecoder> try_create(ReadonlyBytes);

This simplifies ImageDecoder since it no longer has to worry about its
validity. Client code gets slightly clearer as well.
This commit is contained in:
Andreas Kling
2021-07-27 01:12:53 +02:00
parent c6f4ecced9
commit d01b4327fa
6 changed files with 77 additions and 58 deletions
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7
Userland/Services/ImageDecoder/ClientConnection.cpp
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@@ -37,7 +37,12 @@ Messages::ImageDecoderServer::DecodeImageResponse ClientConnection::decode_image
return nullptr;
}
auto decoder = Gfx::ImageDecoder::create(encoded_buffer.data<u8>(), encoded_buffer.size());
auto decoder = Gfx::ImageDecoder::try_create(ReadonlyBytes { encoded_buffer.data<u8>(), encoded_buffer.size() });
if (!decoder) {
dbgln_if(IMAGE_DECODER_DEBUG, "Could not find suitable image decoder plugin for data");
return { false, 0, Vector<Gfx::ShareableBitmap> {}, Vector<u32> {} };
}
if (!decoder->frame_count()) {
dbgln_if(IMAGE_DECODER_DEBUG, "Could not decode image from encoded data");