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//! Take screenshots of a window.
use crate::core::{Rectangle, Size};
use bytes::Bytes;
use std::fmt::{Debug, Formatter};
/// Data of a screenshot, captured with `window::screenshot()`.
///
/// The `bytes` of this screenshot will always be ordered as `RGBA` in the `sRGB` color space.
#[derive(Clone)]
pub struct Screenshot {
/// The bytes of the [`Screenshot`].
pub bytes: Bytes,
/// The size of the [`Screenshot`] in physical pixels.
pub size: Size<u32>,
/// The scale factor of the [`Screenshot`]. This can be useful when converting between widget
/// bounds (which are in logical pixels) to crop screenshots.
pub scale_factor: f64,
}
impl Debug for Screenshot {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(
f,
"Screenshot: {{ \n bytes: {}\n scale: {}\n size: {:?} }}",
self.bytes.len(),
self.scale_factor,
self.size
)
}
}
impl Screenshot {
/// Creates a new [`Screenshot`].
pub fn new(
bytes: impl Into<Bytes>,
size: Size<u32>,
scale_factor: f64,
) -> Self {
Self {
bytes: bytes.into(),
size,
scale_factor,
}
}
/// Crops a [`Screenshot`] to the provided `region`. This will always be relative to the
/// top-left corner of the [`Screenshot`].
pub fn crop(&self, region: Rectangle<u32>) -> Result<Self, CropError> {
if region.width == 0 || region.height == 0 {
return Err(CropError::Zero);
}
if region.x + region.width > self.size.width
|| region.y + region.height > self.size.height
{
return Err(CropError::OutOfBounds);
}
// Image is always RGBA8 = 4 bytes per pixel
const PIXEL_SIZE: usize = 4;
let bytes_per_row = self.size.width as usize * PIXEL_SIZE;
let row_range = region.y as usize..(region.y + region.height) as usize;
let column_range = region.x as usize * PIXEL_SIZE
..(region.x + region.width) as usize * PIXEL_SIZE;
let chopped = self.bytes.chunks(bytes_per_row).enumerate().fold(
vec![],
|mut acc, (row, bytes)| {
if row_range.contains(&row) {
acc.extend(&bytes[column_range.clone()]);
}
acc
},
);
Ok(Self {
bytes: Bytes::from(chopped),
size: Size::new(region.width, region.height),
scale_factor: self.scale_factor,
})
}
}
impl AsRef<[u8]> for Screenshot {
fn as_ref(&self) -> &[u8] {
&self.bytes
}
}
impl From<Screenshot> for Bytes {
fn from(screenshot: Screenshot) -> Self {
screenshot.bytes
}
}
#[derive(Debug, thiserror::Error)]
/// Errors that can occur when cropping a [`Screenshot`].
pub enum CropError {
#[error("The cropped region is out of bounds.")]
/// The cropped region's size is out of bounds.
OutOfBounds,
#[error("The cropped region is not visible.")]
/// The cropped region's size is zero.
Zero,
}
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