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https://github.com/SerenityOS/serenity
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dc0ed5c860
If we can't decode the input data, just have a null decoder. In this state we simply return a null bitmap and whatever empty values make sense for each API. This way, we don't try to decode the same thing over and over since it's not gonna work anyway. :^)
96 lines
3.4 KiB
C++
96 lines
3.4 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/ByteBuffer.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.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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struct ImageFrameDescriptor {
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RefPtr<Bitmap> image;
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int duration { 0 };
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};
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class ImageDecoderPlugin {
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public:
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virtual ~ImageDecoderPlugin() { }
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virtual IntSize 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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virtual bool is_animated() = 0;
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virtual size_t loop_count() = 0;
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virtual size_t frame_count() = 0;
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virtual ImageFrameDescriptor frame(size_t i) = 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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static NonnullRefPtr<ImageDecoder> create(const ByteBuffer& data) { return adopt(*new ImageDecoder(data.data(), data.size())); }
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~ImageDecoder();
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bool is_valid() const { return m_plugin; }
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IntSize size() const { return m_plugin ? m_plugin->size() : IntSize(); }
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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()
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{
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if (m_plugin)
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m_plugin->set_volatile();
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}
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[[nodiscard]] bool set_nonvolatile() { return m_plugin ? m_plugin->set_nonvolatile() : false; }
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bool sniff() const { return m_plugin ? m_plugin->sniff() : false; }
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bool is_animated() const { return m_plugin ? m_plugin->is_animated() : false; }
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size_t loop_count() const { return m_plugin ? m_plugin->loop_count() : 0; }
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size_t frame_count() const { return m_plugin ? m_plugin->frame_count() : 0; }
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ImageFrameDescriptor frame(size_t i) const { return m_plugin ? m_plugin->frame(i) : ImageFrameDescriptor(); }
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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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