Struct SubSink 

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

Offset + bounded wrapper around another EffectSink.

All ops are translated by offset before being forwarded to the inner sink, and target_width / target_height report the clipped sub-region. Used by widget-tree hosts (e.g. rlvgl_widgets::motion::crawl::CrawlWindow) to place an effect at a specific screen location without rewriting every op coordinate inside the effect. No byte-level clipping — the effect is expected to respect the reported target dimensions; the wrapper doesn’t intersect rectangles with the sub-region.

Implementations

impl<'a> SubSink<'a>

pub fn new( inner: &'a mut dyn EffectSink, offset: (i32, i32), width: u32, height: u32, ) -> Self

Build a sub-sink over inner at offset with (width, height) as the reported target size.

Trait Implementations

impl<'a> EffectSink for SubSink<'a>

fn target_width(&self) -> u32

Destination width in pixels as the sink sees it. Effects use this to size per-frame work (number of rows to blend, clipping).

fn target_height(&self) -> u32

Destination height in pixels as the sink sees it.

fn target_format(&self) -> PixelFmt

Destination pixel format. Effects that only support a subset (e.g. ARGB8888) can bail early without emitting ops.

fn fill(&mut self, rect: Rect, color: u32)

Fill rect on the destination with a solid ARGB8888 colour.

fn blit(&mut self, src: &Surface<'_>, src_area: Rect, dst_pos: (i32, i32))

Copy src_area from src to dst_pos on the destination.

fn blend_a8_row(&mut self, alphas: &[u8], dst_pos: (i32, i32), fg_color: u32)

Alpha-blend a single A8 row onto the destination with a fixed foreground colour.