Struct ColorImage Copy item path

Create an image filled with the given color.

Create an image filled with the given color.

Create a ColorImage from flat un-multiplied RGBA data.

This is usually what you want to use after having loaded an image file.

Panics if size[0] * size[1] * 4 != rgba.len().

§Example using the image crate:

fn load_image_from_path(path: &std::path::Path) -> Result<egui::ColorImage, image::ImageError> {
    let image = image::io::Reader::open(path)?.decode()?;
    let size = [image.width() as _, image.height() as _];
    let image_buffer = image.to_rgba8();
    let pixels = image_buffer.as_flat_samples();
    Ok(egui::ColorImage::from_rgba_unmultiplied(
        size,
        pixels.as_slice(),
    ))
}

fn load_image_from_memory(image_data: &[u8]) -> Result<ColorImage, image::ImageError> {
    let image = image::load_from_memory(image_data)?;
    let size = [image.width() as _, image.height() as _];
    let image_buffer = image.to_rgba8();
    let pixels = image_buffer.as_flat_samples();
    Ok(ColorImage::from_rgba_unmultiplied(
        size,
        pixels.as_slice(),
    ))
}

Create a ColorImage from flat opaque gray data.

Panics if size[0] * size[1] != gray.len().

Alternative method to from_gray. Create a ColorImage from iterator over flat opaque gray data.

Panics if size[0] * size[1] != gray_iter.len().

A view of the underlying data as &[u8]

A view of the underlying data as &mut [u8]

Create a ColorImage from flat RGB data.

This is what you want to use after having loaded an image file (and if you are ignoring the alpha channel - considering it to always be 0xff)

Panics if size[0] * size[1] * 3 != rgb.len().

An example color image, useful for tests.

Set the source size of e.g. the original SVG image.

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.

Clone a sub-region as a new image.

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.