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/*
* Copyright (C) Oscar Shrimpton 2020
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* This program 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 General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
use super::PIXEL_SIZE;
use core::ptr::copy_nonoverlapping;
use std::convert::TryInto;
use image::RgbaImage;
/// An object that can be loaded as an image into GPU memory
pub trait LoadableImage {
fn width(&self) -> u32;
fn height(&self) -> u32;
fn copy_row(&self, y: u32, ptr: *mut u8);
unsafe fn copy_into(&self, ptr: *mut u8, row_size: usize);
}
impl LoadableImage for RgbaImage {
fn width(&self) -> u32 {
self.width()
}
fn height(&self) -> u32 {
self.height()
}
fn copy_row(&self, y: u32, ptr: *mut u8) {
let row_size_bytes = self.width() as usize * PIXEL_SIZE;
let raw: &Vec<u8> = self.as_raw();
let row = &raw[y as usize * row_size_bytes..(y as usize + 1) * row_size_bytes];
unsafe {
copy_nonoverlapping(row.as_ptr(), ptr, row.len());
}
}
unsafe fn copy_into(&self, ptr: *mut u8, row_size: usize) {
for y in 0..self.height() as usize {
let dest_base: isize = (y * row_size).try_into().unwrap();
self.copy_row(y as u32, ptr.offset(dest_base));
}
}
}
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