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2cd9716b38
The sniff method is intended to be used for content sniffing. It should be a cheap test to rapidly rule out whether a candidate image can be successfully decoded. For the GIF and PNG implementations it simply attempts to decode the image header, returning true if successful and false if not.
73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/NonnullRefPtr.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefCounted.h>
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#include <LibGfx/Size.h>
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namespace Gfx {
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class Bitmap;
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class ImageDecoderPlugin {
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public:
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virtual ~ImageDecoderPlugin() {}
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virtual Size size() = 0;
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virtual RefPtr<Gfx::Bitmap> bitmap() = 0;
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virtual void set_volatile() = 0;
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[[nodiscard]] virtual bool set_nonvolatile() = 0;
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virtual bool sniff() = 0;
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protected:
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ImageDecoderPlugin() {}
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};
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class ImageDecoder : public RefCounted<ImageDecoder> {
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public:
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static NonnullRefPtr<ImageDecoder> create(const u8* data, size_t size) { return adopt(*new ImageDecoder(data, size)); }
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~ImageDecoder();
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Size size() const { return m_plugin->size(); }
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int width() const { return size().width(); }
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int height() const { return size().height(); }
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RefPtr<Gfx::Bitmap> bitmap() const;
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void set_volatile() { m_plugin->set_volatile(); }
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[[nodiscard]] bool set_nonvolatile() { return m_plugin->set_nonvolatile(); }
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bool sniff() { return m_plugin->sniff(); };
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private:
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ImageDecoder(const u8*, size_t);
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mutable OwnPtr<ImageDecoderPlugin> m_plugin;
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};
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}
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