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LibGfx: Implement SaturateFilter

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This implements the saturate operation as defined in the SVG filter
specification.

(https://drafts.fxtf.org/filter-effects-1/#feColorMatrixElement)
This commit is contained in:
MacDue 2022-10-03 20:44:20 +01:00 committed by Sam Atkins
parent 97f66562cc
commit f77a84a5f6
Notes: sideshowbarker 2024-07-17 06:11:07 +09:00 
Author: https://github.com/MacDue
Commit: https://github.com/SerenityOS/serenity/commit/f77a84a5f6
Pull-request: https://github.com/SerenityOS/serenity/pull/15463
Reviewed-by: https://github.com/AtkinsSJ ✅
Reviewed-by: https://github.com/awesomekling
1 changed files with 40 additions and 0 deletions
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40
Userland/Libraries/LibGfx/Filters/SaturateFilter.h Normal file
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/*
* Copyright (c) 2022, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibGfx/Filters/MatrixFilter.h>
namespace Gfx {
class SaturateFilter : public MatrixFilter {
public:
SaturateFilter(float amount)
: MatrixFilter(calculate_saturate_matrix(amount))
{
}
virtual bool amount_handled_in_filter() const override
{
return true;
}
virtual StringView class_name() const override { return "SaturateFilter"sv; }
private:
static FloatMatrix3x3 calculate_saturate_matrix(float amount)
{
// The matrix is taken directly from the SVG filter specification:
// https://drafts.fxtf.org/filter-effects-1/#feColorMatrixElement
return FloatMatrix3x3 {
0.213f + 0.787f * amount, 0.715f - 0.715f * amount, 0.072f - 0.072f * amount,
0.213f - 0.213f * amount, 0.715f + 0.285f * amount, 0.072f - 0.072f * amount,
0.213f - 0.213f * amount, 0.715f - 0.715f * amount, 0.072f + 0.928f * amount
};
}
};
}