Trait plotters::backend::PixelFormat

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pub trait PixelFormat: Sized {
    const PIXEL_SIZE: usize;
    const EFFECTIVE_PIXEL_SIZE: usize;

    // Required methods
    fn byte_at(r: u8, g: u8, b: u8, a: u64, idx: usize) -> u8;
    fn decode_pixel(data: &[u8]) -> (u8, u8, u8, u64);
    fn blend_rect_fast(
        target: &mut BitMapBackend<'_, Self>,
        upper_left: (i32, i32),
        bottom_right: (i32, i32),
        r: u8,
        g: u8,
        b: u8,
        a: f64
    );
    fn fill_rect_fast(
        target: &mut BitMapBackend<'_, Self>,
        upper_left: (i32, i32),
        bottom_right: (i32, i32),
        r: u8,
        g: u8,
        b: u8
    );

    // Provided methods
    fn fill_vertical_line_fast(
        target: &mut BitMapBackend<'_, Self>,
        x: i32,
        ys: (i32, i32),
        r: u8,
        g: u8,
        b: u8
    ) { ... }
    fn draw_pixel(
        target: &mut BitMapBackend<'_, Self>,
        point: (i32, i32),
        _: (u8, u8, u8),
        alpha: f64
    ) { ... }
    fn can_be_saved() -> bool { ... }
}
Expand description

The trait that describes some details about a particular pixel format

Required Associated Constants§

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const PIXEL_SIZE: usize

Number of bytes per pixel

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const EFFECTIVE_PIXEL_SIZE: usize

Number of effective bytes per pixel, e.g. for BGRX pixel format, the size of pixel is 4 but the effective size is 3, since the 4th byte isn’t used

Required Methods§

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fn byte_at(r: u8, g: u8, b: u8, a: u64, idx: usize) -> u8

Encoding a pixel and returns the idx-th byte for the pixel

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fn decode_pixel(data: &[u8]) -> (u8, u8, u8, u64)

Decode a pixel at the given location

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fn blend_rect_fast( target: &mut BitMapBackend<'_, Self>, upper_left: (i32, i32), bottom_right: (i32, i32), r: u8, g: u8, b: u8, a: f64 )

The fast alpha blending algorithm for this pixel format

  • target: The target bitmap backend
  • upper_left: The upper-left coord for the rect
  • bottom_right: The bottom-right coord for the rect
  • r, g, b, a: The blending color and alpha value
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fn fill_rect_fast( target: &mut BitMapBackend<'_, Self>, upper_left: (i32, i32), bottom_right: (i32, i32), r: u8, g: u8, b: u8 )

The fast rectangle filling algorithm

  • target: The target bitmap backend
  • upper_left: The upper-left coord for the rect
  • bottom_right: The bottom-right coord for the rect
  • r, g, b: The filling color

Provided Methods§

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fn fill_vertical_line_fast( target: &mut BitMapBackend<'_, Self>, x: i32, ys: (i32, i32), r: u8, g: u8, b: u8 )

The fast vertical line filling algorithm

  • target: The target bitmap backend
  • x: the X coordinate for the entire line
  • ys: The range of y coord
  • r, g, b: The blending color and alpha value
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fn draw_pixel( target: &mut BitMapBackend<'_, Self>, point: (i32, i32), _: (u8, u8, u8), alpha: f64 )

Drawing a single pixel in this format

  • target: The target bitmap backend
  • point: The coord of the point
  • r, g, b: The filling color
  • alpha: The alpha value
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fn can_be_saved() -> bool

Indicates if this pixel format can be saved as image. Note: Currently we only using RGB pixel format in the image crate, but later we may lift this restriction

  • returns: If the image can be saved as image file

Implementors§