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// SPDX-License-Identifier: LGPL-3.0-or-later
/*
* libopenraw - grayscale.rs
*
* Copyright (C) 2023 Hubert Figuière
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
use crate::bitmap::ImageBuffer;
use crate::{Error, Result};
/// Convert a grayscale buffer to RGB
///
/// It's done naively.
pub(crate) fn to_rgb(buffer: &ImageBuffer<f64>) -> Result<ImageBuffer<f64>> {
if buffer.cc != 1 {
return Err(Error::InvalidFormat);
}
let width = buffer.width;
let height = buffer.height;
let out = buffer
.data
.iter()
.flat_map(|v| [*v, *v, *v])
.collect::<Vec<f64>>();
Ok(ImageBuffer::with_data(out, width, height, buffer.bpc, 3))
}
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