Struct webrender::picture::SurfaceInfo

pub struct SurfaceInfo {
    pub unclipped_local_rect: PictureRect,
    pub clipped_local_rect: PictureRect,
    pub is_opaque: bool,
    pub clipping_rect: PictureRect,
    pub map_local_to_surface: SpaceMapper<LayoutPixel, PicturePixel>,
    pub raster_spatial_node_index: SpatialNodeIndex,
    pub surface_spatial_node_index: SpatialNodeIndex,
    pub device_pixel_scale: DevicePixelScale,
    pub world_scale_factors: (f32, f32),
    pub local_scale: (f32, f32),
    pub allow_snapping: bool,
    pub force_scissor_rect: bool,
}

Information about an offscreen surface. For now, it contains information about the size and coordinate system of the surface. In the future, it will contain information about the contents of the surface, which will allow surfaces to be cached / retained between frames and display lists.

Fields

unclipped_local_rect: PictureRect

A local rect defining the size of this surface, in the coordinate system of the surface itself. This contains the unclipped bounding rect of child primitives.

clipped_local_rect: PictureRect

The local space coverage of child primitives after they are are clipped to their owning clip-chain.

is_opaque: bool

If true, we know this surface is completely opaque

clipping_rect: PictureRect

The (conservative) valid part of this surface rect. Used to reduce the size of render target allocation.

map_local_to_surface: SpaceMapper<LayoutPixel, PicturePixel>

Helper structs for mapping local rects in different coordinate systems into the surface coordinates.

raster_spatial_node_index: SpatialNodeIndex

Defines the positioning node for the surface itself, and the rasterization root for this surface.

surface_spatial_node_index: SpatialNodeIndex

device_pixel_scale: DevicePixelScale

The device pixel ratio specific to this surface.

world_scale_factors: (f32, f32)

The scale factors of the surface to world transform.

local_scale: (f32, f32)

Local scale factors surface to raster transform

allow_snapping: bool

If true, allow snapping on this and child surfaces

force_scissor_rect: bool

If true, the scissor rect must be set when drawing this surface

Implementations

impl SurfaceInfo

pub fn new( surface_spatial_node_index: SpatialNodeIndex, raster_spatial_node_index: SpatialNodeIndex, world_rect: WorldRect, spatial_tree: &SpatialTree, device_pixel_scale: DevicePixelScale, world_scale_factors: (f32, f32), local_scale: (f32, f32), allow_snapping: bool, force_scissor_rect: bool ) -> Self

pub fn clamp_blur_radius( &self, x_blur_radius: f32, y_blur_radius: f32 ) -> (f32, f32)

Clamps the blur radius depending on scale factors.

pub fn map_to_device_rect( &self, local_rect: &PictureRect, spatial_tree: &SpatialTree ) -> DeviceRect

pub fn get_surface_rect( &self, local_rect: &PictureRect, spatial_tree: &SpatialTree ) -> Option<DeviceRect>

Clip and transform a local rect to a device rect suitable for allocating a child off-screen surface of this surface (e.g. for clip-masks)