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LibJS: Add Uint8ClampedArray :^)
This is a special kind of byte array that clamps its values to 0...255 It will be used for HTML ImageData objects. I made Object::put_by_index() and get_by_index() virtual for this. We'll probably need to make non-numeric property name lookups virtual as well, but this solves my current problem well enough.
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5 changed files with 144 additions and 2 deletions
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Libraries/LibJS/Runtime/Uint8ClampedArray.h
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58
Libraries/LibJS/Runtime/Uint8ClampedArray.h
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/*
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* Copyright (c) 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 <LibJS/Runtime/Object.h>
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namespace JS {
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class Uint8ClampedArray final : public Object {
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public:
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static Uint8ClampedArray* create(GlobalObject&, i32 length);
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Uint8ClampedArray(i32 length, Object& prototype);
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virtual ~Uint8ClampedArray() override;
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i32 length() const { return m_length; }
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virtual void put_by_index(i32 property_index, Value value) override;
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virtual Optional<Value> get_by_index(i32 property_index) const override;
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u8* data() { return m_data; }
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const u8* data() const { return m_data; }
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private:
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virtual const char* class_name() const override { return "Uint8ClampedArray"; }
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virtual bool is_array() const override { return true; }
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static Value length_getter(Interpreter&);
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u8* m_data { nullptr };
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i32 m_length { 0 };
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};
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}
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