webrender::prim_store::image

Struct AdjustedImageSource

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pub struct AdjustedImageSource {
    x0: f32,
    y0: f32,
    x1: f32,
    y1: f32,
}
Expand description

Represents an adjustment to apply to an image primitive. This can be used to compensate for a difference between the bounds of the images expected by the primitive and the bounds that were actually drawn in the texture cache.

This happens when rendering snapshot images: A picture is marked so that a specific reference area in layout space can be rendered as an image. However, the bounds of the rasterized area of the picture typically differ from that reference area.

The adjustment is stored as 4 floats (x0, y0, x1, y1) that represent a transformation of the primitve’s local rect such that:

adjusted_rect.min = prim_rect.min + prim_rect.size() * (x0, y0);
adjusted_rect.max = prim_rect.max + prim_rect.size() * (x1, y1);

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§x0: f32§y0: f32§x1: f32§y1: f32

Implementations§

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impl AdjustedImageSource

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pub fn new() -> Self

The “identity” adjustment.

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pub fn from_rects(reference: &LayoutRect, actual: &LayoutRect) -> Self

An adjustment to render an image item defined in function of the reference rect whereas the actual rect was cached instead.

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pub fn map_local_rect(&self, rect: &LayoutRect) -> LayoutRect

Adjust the primitive’s local rect.

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pub fn map_stretch_size(&self, size: LayoutSize) -> LayoutSize

The stretch size has to be adjusted as well because it is defined using the snapshot area as reference but will stretch the rasterized area instead.

It has to be scaled by a factor of (adjusted.size() / prim_rect.size()). We derive the formula in function of the adjustment factors:

factor = (adjusted.max - adjusted.min) / (w, h)
       = (rect.max + (w, h) * (x1, y1) - (rect.min + (w, h) * (x0, y0))) / (w, h)
       = ((w, h) + (w, h) * (x1, y1) - (w, h) * (x0, y0)) / (w, h)
       = (1.0, 1.0) + (x1, y1) - (x0, y0)

Trait Implementations§

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impl Clone for AdjustedImageSource

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fn clone(&self) -> AdjustedImageSource

Returns a copy of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for AdjustedImageSource

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

Formats the value using the given formatter. Read more
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impl Serialize for AdjustedImageSource

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Copy for AdjustedImageSource

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impl<T> Any for T
where T: 'static + ?Sized,

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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Calls U::from(self).

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const ALIGN: usize

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type Init = T

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Performs the conversion.