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Add Context::copy_image (#5533)

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* Closes https://github.com/emilk/egui/issues/5424

This adds support for copying images to the system clipboard on native
and on web using `Context::copy_image`.
This commit is contained in:
Emil Ernerfeldt
2024-12-29 18:03:32 +01:00
committed by GitHub
parent e2c7e9e733
commit bf6ed3adfc
15 changed files with 285 additions and 41 deletions
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64
crates/epaint/src/image.rs
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@@ -143,37 +143,6 @@ impl ColorImage {
bytemuck::cast_slice_mut(&mut self.pixels)
}
/// Create a new Image from a patch of the current image. This method is especially convenient for screenshotting a part of the app
/// since `region` can be interpreted as screen coordinates of the entire screenshot if `pixels_per_point` is provided for the native application.
/// The floats of [`emath::Rect`] are cast to usize, rounding them down in order to interpret them as indices to the image data.
///
/// Panics if `region.min.x > region.max.x || region.min.y > region.max.y`, or if a region larger than the image is passed.
pub fn region(&self, region: &emath::Rect, pixels_per_point: Option<f32>) -> Self {
let pixels_per_point = pixels_per_point.unwrap_or(1.0);
let min_x = (region.min.x * pixels_per_point) as usize;
let max_x = (region.max.x * pixels_per_point) as usize;
let min_y = (region.min.y * pixels_per_point) as usize;
let max_y = (region.max.y * pixels_per_point) as usize;
assert!(
min_x <= max_x && min_y <= max_y,
"Screenshot region is invalid: {region:?}"
);
let width = max_x - min_x;
let height = max_y - min_y;
let mut output = Vec::with_capacity(width * height);
let row_stride = self.size[0];
for row in min_y..max_y {
output.extend_from_slice(
&self.pixels[row * row_stride + min_x..row * row_stride + max_x],
);
}
Self {
size: [width, height],
pixels: output,
}
}
/// Create a [`ColorImage`] from flat RGB data.
///
/// This is what you want to use after having loaded an image file (and if
@@ -215,6 +184,39 @@ impl ColorImage {
pub fn height(&self) -> usize {
self.size[1]
}
/// Create a new image from a patch of the current image.
///
/// This method is especially convenient for screenshotting a part of the app
/// since `region` can be interpreted as screen coordinates of the entire screenshot if `pixels_per_point` is provided for the native application.
/// The floats of [`emath::Rect`] are cast to usize, rounding them down in order to interpret them as indices to the image data.
///
/// Panics if `region.min.x > region.max.x || region.min.y > region.max.y`, or if a region larger than the image is passed.
pub fn region(&self, region: &emath::Rect, pixels_per_point: Option<f32>) -> Self {
let pixels_per_point = pixels_per_point.unwrap_or(1.0);
let min_x = (region.min.x * pixels_per_point) as usize;
let max_x = (region.max.x * pixels_per_point) as usize;
let min_y = (region.min.y * pixels_per_point) as usize;
let max_y = (region.max.y * pixels_per_point) as usize;
assert!(
min_x <= max_x && min_y <= max_y,
"Screenshot region is invalid: {region:?}"
);
let width = max_x - min_x;
let height = max_y - min_y;
let mut output = Vec::with_capacity(width * height);
let row_stride = self.size[0];
for row in min_y..max_y {
output.extend_from_slice(
&self.pixels[row * row_stride + min_x..row * row_stride + max_x],
);
}
Self {
size: [width, height],
pixels: output,
}
}
}
impl std::ops::Index<(usize, usize)> for ColorImage {