Struct VisibleTile 

pub struct VisibleTile {
    pub target: TileId,
    pub actual: TileId,
    pub data: Option<TileData>,
    pub fade_opacity: f32,
}

A single visible tile, either the exact tile, a parent fallback, or a child fallback (underzoom).

Fields

target: TileId

The tile ID that should be displayed at this position.

actual: TileId

The tile ID whose data is actually available.

data: Option<TileData>

Decoded pixel data for actual.

fade_opacity: f32

Per-tile opacity for fade-in transitions (0.0 = fully transparent, 1.0 = fully opaque).

Renderers should multiply the tile fragment alpha by this value. During cross-fade, parent fallback tiles are emitted with a complementary opacity so the overall blending is seamless.

Implementations

impl VisibleTile

pub fn is_loaded(&self) -> bool

Whether this tile has data available for rendering.

pub fn is_fallback(&self) -> bool

Whether this tile is using fallback imagery instead of the ideal tile.

pub fn is_overzoomed(&self) -> bool

Whether this tile is overzoomed – i.e. the display zoom exceeds the source’s maximum zoom and the tile is being rendered from a lower-zoom source tile.

pub fn is_child_fallback(&self) -> bool

Whether this tile is using a higher-zoom child as underzoom fallback.

True when the actual tile’s zoom is greater than target’s zoom, meaning a cached child tile is composited into a sub-region of the target’s grid cell while the target itself is still loading.

pub fn texture_region(&self) -> TileTextureRegion

Normalized texture-space region within actual that should be used when rendering this visible tile.

For parent fallback (overzoom), the returned region extracts the relevant sub-tile from the lower-zoom parent texture. For child fallback (underzoom), the full child texture is used — the renderer is responsible for placing the geometry at the child’s grid-cell bounds rather than the target’s.

pub fn pixel_crop_rect(&self, width: u32, height: u32) -> Option<TilePixelRect>

Pixel crop rectangle within an actual image of the given size that should be used when rendering this visible tile.

Trait Implementations

impl Clone for VisibleTile

fn clone(&self) -> VisibleTile

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for VisibleTile

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.