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https://github.com/LadybirdBrowser/ladybird.git
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6d4ba21832
Add factory functions to distinguish between when the owner of the File wants to transfer ownership to the new IPC object (adopt) or to send a copy of the same fd to the IPC peer (clone). This behavior is more intuitive than the previous behavior. Previously, an IPC::File would default to a shallow clone of the file descriptor, only *actually* calling dup(2) for the fd when encoding or it into an IPC MessageBuffer. Now the dup(2) for the fd is explicit in the clone_fd factory function.
61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/ShareableBitmap.h>
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#include <LibGfx/Size.h>
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#include <LibIPC/Decoder.h>
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#include <LibIPC/Encoder.h>
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#include <LibIPC/File.h>
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namespace Gfx {
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ShareableBitmap::ShareableBitmap(NonnullRefPtr<Bitmap> bitmap, Tag)
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: m_bitmap(move(bitmap))
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{
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}
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}
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namespace IPC {
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template<>
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ErrorOr<void> encode(Encoder& encoder, Gfx::ShareableBitmap const& shareable_bitmap)
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{
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TRY(encoder.encode(shareable_bitmap.is_valid()));
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if (!shareable_bitmap.is_valid())
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return {};
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auto& bitmap = *shareable_bitmap.bitmap();
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TRY(encoder.encode(TRY(IPC::File::clone_fd(bitmap.anonymous_buffer().fd()))));
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TRY(encoder.encode(bitmap.size()));
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TRY(encoder.encode(static_cast<u32>(bitmap.scale())));
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TRY(encoder.encode(static_cast<u32>(bitmap.format())));
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return {};
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}
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template<>
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ErrorOr<Gfx::ShareableBitmap> decode(Decoder& decoder)
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{
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if (auto valid = TRY(decoder.decode<bool>()); !valid)
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return Gfx::ShareableBitmap {};
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auto anon_file = TRY(decoder.decode<IPC::File>());
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auto size = TRY(decoder.decode<Gfx::IntSize>());
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auto scale = TRY(decoder.decode<u32>());
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auto raw_bitmap_format = TRY(decoder.decode<u32>());
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if (!Gfx::is_valid_bitmap_format(raw_bitmap_format))
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return Error::from_string_literal("IPC: Invalid Gfx::ShareableBitmap format");
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auto bitmap_format = static_cast<Gfx::BitmapFormat>(raw_bitmap_format);
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auto buffer = TRY(Core::AnonymousBuffer::create_from_anon_fd(anon_file.take_fd(), Gfx::Bitmap::size_in_bytes(Gfx::Bitmap::minimum_pitch(size.width() * scale, bitmap_format), size.height() * scale)));
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auto bitmap = TRY(Gfx::Bitmap::create_with_anonymous_buffer(bitmap_format, move(buffer), size, scale));
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return Gfx::ShareableBitmap { move(bitmap), Gfx::ShareableBitmap::ConstructWithKnownGoodBitmap };
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}
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}
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