Trait kas::draw::DrawShared

pub trait DrawShared {
    // Required methods
    fn image_alloc(
        &mut self,
        size: (u32, u32)
    ) -> Result<ImageHandle, AllocError>;
    fn image_upload(
        &mut self,
        handle: &ImageHandle,
        data: &[u8],
        format: ImageFormat
    );
    fn image_free(&mut self, handle: ImageHandle);
    fn image_size(&self, handle: &ImageHandle) -> Option<Size>;
}

Interface over SharedState

All methods concern management of resources for drawing.

Required Methods

fn image_alloc(&mut self, size: (u32, u32)) -> Result<ImageHandle, AllocError>

Allocate an image

Use SharedState::image_upload to set contents of the new image.

fn image_upload( &mut self, handle: &ImageHandle, data: &[u8], format: ImageFormat )

Upload an image to the GPU

This should be called at least once on each image before display. May be called again to update the image contents.

handle must refer to an allocation of some size (w, h), such that data.len() == b * w * h where b is the number of bytes per pixel, according to format. Data must be in row-major order.

fn image_free(&mut self, handle: ImageHandle)

Potentially free an image

The input handle is consumed. If this reduces its reference count to zero, then the image is freed.

fn image_size(&self, handle: &ImageHandle) -> Option<Size>

Get the size of an image

Implementors

impl<DS> DrawShared for SharedState<DS>

where DS: DrawSharedImpl,