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A Resource represents a resource that we're loading, have loaded or will soon load. Basically, it's a downloadable resource that can be shared by multiple clients. A typical usecase is multiple <img> elements with the same src. In a future patch, we will try to make sure that those <img> elements get the same Resource if possible. This will reduce network usage, memory usage, and CPU usage. :^) For now, this first patch simply introduces the mechanism. You get a Resource by calling ResourceLoader::load_resource(). To get notified about changes to a Resource's load status, you inherit from ResourceClient and implement the callbacks you're interested in. This patch turns HTMLImageElement into a ResourceClient.
83 lines
2.8 KiB
C++
83 lines
2.8 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 <LibCore/Forward.h>
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#include <LibGfx/Forward.h>
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#include <LibWeb/DOM/HTMLElement.h>
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#include <LibWeb/Loader/Resource.h>
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namespace Web {
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class LayoutDocument;
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class HTMLImageElement final
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: public HTMLElement
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, public ResourceClient {
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public:
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using WrapperType = Bindings::HTMLImageElementWrapper;
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HTMLImageElement(Document&, const FlyString& tag_name);
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virtual ~HTMLImageElement() override;
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virtual void parse_attribute(const FlyString& name, const String& value) override;
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String alt() const { return attribute("alt"); }
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String src() const { return attribute("src"); }
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int preferred_width() const;
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int preferred_height() const;
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const Gfx::Bitmap* bitmap() const;
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const Gfx::ImageDecoder* image_decoder() const { return m_image_decoder; }
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void set_volatile(Badge<LayoutDocument>, bool);
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private:
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virtual void resource_did_load() override;
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virtual void resource_did_fail() override;
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void load_image(const String& src);
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void animate();
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virtual RefPtr<LayoutNode> create_layout_node(const StyleProperties* parent_style) const override;
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RefPtr<Gfx::ImageDecoder> m_image_decoder;
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size_t m_current_frame_index { 0 };
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size_t m_loops_completed { 0 };
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NonnullRefPtr<Core::Timer> m_timer;
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};
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template<>
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inline bool is<HTMLImageElement>(const Node& node)
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{
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return is<Element>(node) && to<Element>(node).tag_name().equals_ignoring_case("img");
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}
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}
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