Struct BitmapBand 

pub struct BitmapBand<'bmp, P: Pixel> {
    pub width: u32,
    pub height: u32,
    pub y_start: u32,
    pub stride: usize,
    /* private fields */
}

A mutable view into a horizontal band of a Bitmap.

Created by Bitmap::bands_mut. Provides the same row-access interface as Bitmap<P> but covers only the rows [y_start, y_start + height).

Row indices passed to BitmapBand::row_and_alpha_mut and BitmapBand::row_bytes_mut are absolute (i.e. in the same coordinate space as the parent bitmap), not band-local.

Fields

width: u32

Pixel width of the band (same as the parent bitmap width).

height: u32

Number of rows in this band.

y_start: u32

Absolute y-coordinate of the first row in the full bitmap.

stride: usize

Byte distance between the start of consecutive rows.

Implementations

impl<P: Pixel> BitmapBand<'_, P>

pub fn row_and_alpha_mut(&mut self, y: u32) -> (&mut [u8], Option<&mut [u8]>)

Simultaneous mutable access to the pixel row and the alpha row.

y is the absolute row index (must satisfy y_start ≤ y < y_start + height).

Returns (pixel_row_bytes, Some(alpha_row)) or (pixel_row_bytes, None).

Panics

Panics if y is outside [y_start, y_start + height).

pub fn row_bytes_mut(&mut self, y: u32) -> &mut [u8]

Raw byte mutable access to the full stride of row y.

y is the absolute row index (must satisfy y_start ≤ y < y_start + height).

Panics

Panics if y is outside [y_start, y_start + height).