Struct druid::piet::BitmapTarget

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

A struct provides a RenderContext and then can have its bitmap extracted.

Implementations

impl<'a> BitmapTarget<'a>

pub fn render_context(&mut self) -> CairoRenderContext<'_>

Get a piet RenderContext for the bitmap.

Note: caller is responsible for calling finish on the render context at the end of rendering.

pub fn copy_raw_pixels( &mut self, fmt: ImageFormat, buf: &mut [u8] ) -> Result<usize, Error>

Get raw RGBA pixels from the bitmap by copying them into buf. If all the pixels were copied, returns the number of bytes written. If buf wasn’t big enough, returns an error and doesn’t write anything.

Note: caller is responsible for making sure the requested ImageFormat is supported.

pub fn to_image_buf(&mut self, fmt: ImageFormat) -> Result<ImageBuf, Error>

Get an in-memory pixel buffer from the bitmap.

Note: caller is responsible for making sure the requested ImageFormat is supported.

pub fn save_to_file<P>(self, path: P) -> Result<(), Error>where P: AsRef<Path>,

Save bitmap to RGBA PNG file