WebRender ImageKey and ImageTemplate

image.rs

#[cfg_attr(feature = "capture", derive(Serialize))]
#[cfg_attr(feature = "replay", derive(Deserialize))]
#[derive(Debug, Clone, Eq, PartialEq, Hash)]
pub struct ImageKey {
    pub common: PrimKeyCommonData,
    pub key: ApiImageKey,
    pub stretch_size: SizeKey,
    pub tile_spacing: SizeKey,
    pub color: ColorU,
    pub sub_rect: Option<DeviceIntRect>,
    pub image_rendering: ImageRendering,
    pub alpha_type: AlphaType,
}

pub struct Image {
    pub key: ApiImageKey,
    pub stretch_size: SizeKey,
    pub tile_spacing: SizeKey,
    pub color: ColorU,
    pub sub_rect: Option<DeviceIntRect>,
    pub image_rendering: ImageRendering,
    pub alpha_type: AlphaType,
}

#[cfg_attr(feature = "capture", derive(Serialize))]
#[cfg_attr(feature = "replay", derive(Deserialize))]
pub struct ImageTemplate {
    pub common: PrimTemplateCommonData,
    pub key: ApiImageKey,
    pub stretch_size: LayoutSize,
    pub tile_spacing: LayoutSize,
    pub color: ColorF,
    pub source: ImageSource,
    pub image_rendering: ImageRendering,
    pub sub_rect: Option<DeviceIntRect>,
    pub alpha_type: AlphaType,
}

/// Fields of ImageKey and Image are in common. Proposed refactor into
pub struct Image {
    pub key: ApiImageKey,
    pub stretch_size: SizeKey,
    pub tile_spacing: SizeKey,
    pub color: ColorU,
    pub sub_rect: Option<DeviceIntRect>,
    pub image_rendering: ImageRendering,
    pub alpha_type: AlphaType,
}

pub struct PrimKey<T> {
    pub kind: T,
    // These are the fields of PrimKeyCommonData.  We may want to keep
    // common data to allow split borrowing? (ie. We can present a common
    // interface to return the common data for a prim key)
    pub is_backface_visible: bool,
    pub prim_size: SizeKey,
    pub prim_relative_clip_rect: RectangleKey,
}

/// Split Template similarly to allow split borrow between template data
/// and GPU Handle, for example.
pub ImageTemplateKind {
    pub color_depth: ColorDepth,
    pub yuv_key: [ApiImageKey; 3],
    pub format: YuvFormat,
    pub color_space: YuvColorSpace,
    pub image_rendering: ImageRendering,
}
pub struct PrimTemplate<T>
    pub kind: T,
    pub is_backface_visible: bool,
    pub prim_size: LayoutSize,
    pub prim_relative_clip_rect: LayoutRect,
    pub opacity: PrimitiveOpacity,
    /// The GPU cache handle for a primitive template. Since this structure
    /// is retained across display lists by interning, this GPU cache handle
    /// also remains valid, which reduces the number of updates to the GPU
    /// cache when a new display list is processed.
    pub gpu_cache_handle: GpuCacheHandle,
}
pub type ImageTemplate = PrimTemplate<ImageTemplateKind>;