Struct SkiaBackend 

pub struct SkiaBackend<'a> { /* private fields */ }

Implementations

impl<'a> SkiaBackend<'a>

pub fn new( canvas: &'a Canvas, font_collection: &'a mut FontCollection, size: (i32, i32), ) -> Self

Trait Implementations

impl DrawingBackend for SkiaBackend<'_>

type ErrorType = SkiaBackendError

The error type reported by the backend

fn draw_line<S: BackendStyle>( &mut self, from: BackendCoord, to: BackendCoord, style: &S, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a line on the drawing backend

fn draw_rect<S: BackendStyle>( &mut self, upper_left: BackendCoord, bottom_right: BackendCoord, style: &S, fill: bool, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a rectangle on the drawing backend

fn draw_path<S: BackendStyle, I: IntoIterator<Item = BackendCoord>>( &mut self, path: I, style: &S, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a path on the drawing backend

fn draw_circle<S: BackendStyle>( &mut self, center: BackendCoord, radius: u32, style: &S, fill: bool, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a circle on the drawing backend

fn fill_polygon<S: BackendStyle, I: IntoIterator<Item = BackendCoord>>( &mut self, vert: I, style: &S, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

fn draw_text<TStyle: BackendTextStyle>( &mut self, text: &str, style: &TStyle, pos: BackendCoord, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a text on the drawing backend

fn estimate_text_size<TStyle: BackendTextStyle>( &self, text: &str, style: &TStyle, ) -> Result<(u32, u32), DrawingErrorKind<Self::ErrorType>>

Estimate the size of the horizontal text if rendered on this backend. This is important because some of the backend may not have font ability. Thus this allows those backend reports proper value rather than ask the font rasterizer for that.

fn draw_pixel( &mut self, _point: BackendCoord, _color: BackendColor, ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Draw a pixel on the drawing backend

fn get_size(&self) -> (u32, u32)

Get the dimension of the drawing backend in pixels

fn ensure_prepared(&mut self) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Ensure the backend is ready to draw

fn present(&mut self) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Finalize the drawing step and present all the changes. This is used as the real-time rendering support. The backend may implement in the following way, when ensure_prepared is called it checks if it needs a fresh buffer and present is called rendering all the pending changes on the screen.

fn blit_bitmap( &mut self, pos: (i32, i32), _: (u32, u32), src: &[u8], ) -> Result<(), DrawingErrorKind<Self::ErrorType>>

Blit a bitmap on to the backend.