57e19a7e56
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.
46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
/*
|
|
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <LibGfx/ICOLoader.h>
|
|
#include <LibGfx/ImageDecoder.h>
|
|
|
|
namespace Gfx {
|
|
|
|
struct BMPLoadingContext;
|
|
class ICOImageDecoderPlugin;
|
|
|
|
class BMPImageDecoderPlugin final : public ImageDecoderPlugin {
|
|
public:
|
|
static ErrorOr<bool> sniff(ReadonlyBytes);
|
|
static ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> create(ReadonlyBytes);
|
|
static ErrorOr<NonnullOwnPtr<BMPImageDecoderPlugin>> create_as_included_in_ico(Badge<ICOImageDecoderPlugin>, ReadonlyBytes);
|
|
|
|
enum class IncludedInICO {
|
|
Yes,
|
|
No,
|
|
};
|
|
|
|
virtual ~BMPImageDecoderPlugin() override;
|
|
|
|
virtual IntSize size() override;
|
|
virtual void set_volatile() override;
|
|
[[nodiscard]] virtual bool set_nonvolatile(bool& was_purged) override;
|
|
virtual bool initialize() override;
|
|
bool sniff_dib();
|
|
virtual bool is_animated() override;
|
|
virtual size_t loop_count() override;
|
|
virtual size_t frame_count() override;
|
|
virtual ErrorOr<ImageFrameDescriptor> frame(size_t index) override;
|
|
|
|
private:
|
|
BMPImageDecoderPlugin(u8 const*, size_t, IncludedInICO included_in_ico = IncludedInICO::No);
|
|
|
|
OwnPtr<BMPLoadingContext> m_context;
|
|
};
|
|
|
|
}
|