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LibJS: Add Uint8ClampedArray :^)

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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.
This commit is contained in:
Andreas Kling 2020-04-21 23:46:51 +02:00
parent 0fa7cf70b5
commit 627fd6374b
5 changed files with 144 additions and 2 deletions
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58
Libraries/LibJS/Runtime/Uint8ClampedArray.h Normal file
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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <LibJS/Runtime/Object.h>
namespace JS {
class Uint8ClampedArray final : public Object {
public:
static Uint8ClampedArray* create(GlobalObject&, i32 length);
Uint8ClampedArray(i32 length, Object& prototype);
virtual ~Uint8ClampedArray() override;
i32 length() const { return m_length; }
virtual void put_by_index(i32 property_index, Value value) override;
virtual Optional<Value> get_by_index(i32 property_index) const override;
u8* data() { return m_data; }
const u8* data() const { return m_data; }
private:
virtual const char* class_name() const override { return "Uint8ClampedArray"; }
virtual bool is_array() const override { return true; }
static Value length_getter(Interpreter&);
u8* m_data { nullptr };
i32 m_length { 0 };
};
}