Crate webrender_api

The webrender_api crate contains an assortment types and functions used by WebRender consumers as well as, in many cases, WebRender itself.

This separation allows Servo to parallelize compilation across webrender and other crates that depend on webrender_api. So in practice, we put things in this crate when Servo needs to use them. Firefox depends on the webrender crate directly, and so this distinction is not really relevant there.

Re-exports

• pub extern crate euclid;

Modules

• channel
• units
  A collection of coordinate spaces and their corresponding Point, Size and Rect types.

Macros

• enumerate_interners
  Meta-macro to enumerate the various interner identifiers and types.

Structs

• AddBlobImage
  Creates a blob-image resource with provided parameters.
• AddFontInstance
  Creates a font instance resource.
• AddImage
  Creates an image resource with provided parameters.
• AuxIter
• BackdropFilterDisplayItem
  Renders a filtered region of its backdrop
• BlendPrimitive
• BlobImageDescriptor
  Metadata (but not storage) for a blob image.
• BlobImageKey
  An opaque identifier describing a blob image registered with WebRender. This is used as a handle to reference blob images, and can be used as an image in display items.
• BlobImageParams
  Input parameters for the BlobImageRasterizer.
• BlobImageRequest
  A key identifying blob image rasterization work requested from the blob image rasterizer.
• BlurPrimitive
• BorderDisplayItem
• BorderRadius
• BorderSide
• BoxShadowDisplayItem
• BuiltDisplayList
  A display list.
• BuiltDisplayListDescriptor
  Describes the memory layout of a display list.
• BuiltDisplayListIter
• CaptureBits
  Bit flags for WR stages to store in a capture.
• CapturedDocument
  Information about a loaded capture of each document that is returned by RenderBackend.
• ClearCache
  Mask for clearing caches in debug commands.
• ClearRectangleDisplayItem
  Clears all colors from the area, making it possible to cut holes in the window. (useful for things like the macos frosted-glass effect).
• ClipChainId
• ClipChainItem
  Just an abstraction for bundling up a bunch of clips into a “super clip”.
• ClipDisplayItem
• ColorF
  Represents RGBA screen colors with floating point numbers.
• ColorMatrixPrimitive
  cbindgen:derive-eq=false
• ColorU
  Represents RGBA screen colors with one byte per channel.
• CommonItemProperties
  A grouping of fields a lot of display items need, just to avoid repeating these over and over in this file.
• ComplexClipRegion
• ComponentTransferPrimitive
• CompositePrimitive
• DebugFlags
  Flags to enable/disable various builtin debugging tools.
• DisplayItemRef
• DisplayListBuilder
• DocumentId
  A key uniquely identifying a WebRender document.
• DocumentTransaction
• DropShadowPrimitive
• DynamicProperties
  When using generate_frame(), a list of PropertyValue structures can optionally be supplied to provide the current value of any animated properties.
• Epoch
  An epoch identifies the state of a pipeline in time.
• ExternalEvent
  An opaque pointer-sized value.
• ExternalImage
  The data that an external client should provide about an external image. For instance, if providing video frames, the application could call wr.render() whenever a new video frame is ready. Note that the UV coords are supplied in texel-space!
• ExternalImageData
  Descriptor for external image resources. See ImageData.
• ExternalImageId
  An arbitrary identifier for an external image provided by the application. It must be a unique identifier for each external image.
• ExternalScrollId
  An external identifier that uniquely identifies a scroll frame independent of its ClipId, which may change from frame to frame. This should be unique within a pipeline. WebRender makes no attempt to ensure uniqueness. The zero value is reserved for use by the root scroll node of every pipeline, which always has an external id.
• FilterData
• FilterPrimitive
  SVG Filter Primitive. See: https://github.com/eqrion/cbindgen/issues/9 cbindgen:derive-eq=false
• FloodPrimitive
• FontInstanceData
  Data corresponding to an instantiation of a font, with size and other options specified.
• FontInstanceFlags
• FontInstanceKey
• FontInstanceOptions
• FontInstancePlatformOptions
• FontKey
• FontVariation
• GlyphDimensions
• GlyphInstance
• GlyphOptions
• Gradient
• GradientBuilder
  Construct a gradient to be used in display lists.
• GradientDisplayItem
  The area
• GradientStop
• HitTestDisplayItem
  A minimal hit-testable item for the parent browser’s convenience, and is slimmer than a RectangleDisplayItem (no color). The existence of this as a distinct item also makes it easier to inspect/debug display items.
• HitTestFlags
• HitTestItem
  Describe an item that matched a hit-test query.
• HitTestResult
  Returned by RenderApi::hit_test.
• IdNamespace
  ID namespaces uniquely identify different users of WebRender’s API.
• IdentityPrimitive
• IframeDisplayItem
• ImageDescriptor
  Metadata (but not storage) describing an image In WebRender.
• ImageDescriptorFlags
  Various flags that are part of an image descriptor.
• ImageDisplayItem
  This describes an image that fills the specified area. It stretches or shrinks the image as necessary. While RepeatingImageDisplayItem could otherwise provide a superset of the functionality, it has been problematic inferring the desired repetition properties when snapping changes the size of the primitive.
• ImageKey
  An opaque identifier describing an image registered with WebRender. This is used as a handle to reference images, and is used as the hash map key for the actual image storage in the ResourceCache.
• ImageMask
• InternerSubReport
• InterningMemoryReport
  Memory report for interning-related data structures. cbindgen:derive-eq=false
• ItemRange
• ItemStats
  Stats for an individual item
• LineDisplayItem
• MemoryReport
  Collection of heap sizes, in bytes. cbindgen:derive-eq=false
• NativeFontHandle
• NinePatchBorder
• NormalBorder
• NotificationRequest
  A request to notify a handler when the transaction reaches certain stages of the rendering pipeline.
• OffsetPrimitive
• OpacityPrimitive
• PipelineId
  From the point of view of WR, PipelineId is completely opaque and generic as long as it’s clonable, serializable, comparable, and hashable.
• PremultipliedColorF
  Represents pre-multiplied RGBA colors with floating point numbers.
• PrimitiveFlags
• PropertyBindingId
  A key to identify an animated property binding.
• PropertyBindingKey
  A unique key that is used for connecting animated property values to bindings in the display list.
• PropertyValue
  The current value of an animated property. This is supplied by the calling code.
• PushShadowDisplayItem
• PushStackingContextDisplayItem
• QualitySettings
  Various settings that the caller can select based on desired tradeoffs between rendering quality and performance / power usage.
• RadialGradient
• RadialGradientDisplayItem
• RasterizedBlobImage
  Representation of a rasterized blob image. This is obtained by passing BlobImageData to the embedding via the rasterization callback.
• RectangleDisplayItem
  A solid color to draw (may not actually be a rectangle due to complex clips)
• ReferenceFrame
• ReferenceFrameDisplayListItem
• RenderApi
  The main entry point to interact with WebRender.
• RenderApiSender
  Allows the API to communicate with WebRender.
• RepeatingImageDisplayItem
  This describes a background-image and its tiling. It repeats in a grid to fill the specified area.
• SaveState
• ScrollFrameDisplayItem
• ScrollNodeState
• Shadow
• SpaceAndClipInfo
  Per-primitive information about the nodes in the clip tree and the spatial tree that the primitive belongs to.
• SpatialId
  A reference to a spatial node defining item positioning.
• StackingContext
• StickyFrameDisplayItem
• StickyOffsetBounds
  The minimum and maximum allowable offset for a sticky frame in a single dimension.
• SyntheticItalics
• TempFilterData
• TextDisplayItem
• Transaction
  A Transaction is a group of commands to apply atomically to a document.
• TransactionMsg
  Represents a transaction in the format sent through the channel.
• UpdateBlobImage
  Updates an already existing blob-image resource.
• UpdateImage
  Updates an already existing image resource.
• YuvImageDisplayItem
• ZoomFactor
  Represents a zoom factor.

Enums

• AddFont
  Creates a font resource.
• AlphaType
• ApiMsg
  Message sent by the RenderApi to the render backend thread.
• BlobImageError
  Error code for when blob rasterization failed.
• BorderDetails
• BorderRadiusKind
• BorderStyle
• BoxShadowClipMode
• Checkpoint
  A stage of the rendering pipeline.
• ClipId
  A reference to a clipping node defining how an item is clipped.
• ClipIntern
• ClipMode
• ColorDepth
  Specifies the color depth of an image. Currently only used for YUV images.
• ColorRange
• ColorSpace
• ComponentTransferFuncType
• CompositeOperator
  Available composite operoations for the composite filter primitive
• DebugCommand
  Update of the state of built-in debugging facilities.
• DirtyRect
  The possible states of a Dirty rect.
• DisplayItem
• ExtendMode
• ExternalImageSource
  The source for an external image.
• ExternalImageType
  Storage format identifier for externally-managed images.
• FilterDataIntern
• FilterOp
  CSS filter.
• FilterPrimitiveInput
  An input to a SVG filter primitive.
• FilterPrimitiveKind
  See: https://github.com/eqrion/cbindgen/issues/9 cbindgen:derive-eq=false
• FontHinting
• FontLCDFilter
• FontRenderMode
• FontTemplate
  Container for the raw data describing a font. This might be a stream of bytes corresponding to a downloaded font, or a handle to a native font from the operating system.
• FrameMsg
  Frame messages affect frame generation (applied after building the scene).
• ImageData
  Represents the backing store of an arbitrary series of pixels for display by WebRender. This storage can take several forms.
• ImageFormat
  Specifies the format of a series of pixels, in driver terms.
• ImageRendering
• LineOrientation
• LineStyle
• MixBlendMode
• NinePatchBorderSource
• PrimitiveKeyKind
  Information specific to a primitive type that uniquely identifies a primitive template by key.
• PropertyBinding
  A binding property can either be a specific value (the normal, non-animated case) or point to a binding location to fetch the current value from. Note that Binding has also a non-animated value, the value is used for the case where the animation is still in-delay phase (i.e. the animation doesn’t produce any animation values).
• RasterSpace
  Configure whether the contents of a stacking context should be rasterized in local space or screen space. Local space rasterized pictures are typically used when we want to cache the output, and performance is important. Note that this is a performance hint only, which WR may choose to ignore.
• ReferenceFrameKind
• RepeatMode
• ResourceUpdate
  Update of a persistent resource in WebRender.
• SceneMsg
  Frame messages affect building the scene.
• ScrollClamping
  Describe whether or not scrolling should be clamped by the content bounds.
• ScrollLocation
• ScrollSensitivity
• TextureTarget
  Specifies the type of texture target in driver terms.
• TransformStyle
• YuvColorSpace
• YuvData
• YuvFormat

Constants

• MAX_BLUR_RADIUS
• MAX_TEXT_RUN_LENGTH

Traits

• AsyncBlobImageRasterizer
  A group of rasterization requests to execute synchronously on the scene builder thread.
• BlobImageHandler
  A handler on the render backend that can create rasterizer objects which will be sent to the scene builder thread to execute the rasterization.
• BlobImageResources
  The resources exposed by the resource cache available for use by the blob rasterizer.
• ExternalImageHandler
  The interfaces that an application can implement to support providing external image buffers. When the application passes an external image to WR, it should keep that external image life time. People could check the epoch id in RenderNotifier at the client side to make sure that the external image is not used by WR. Then, do the clean up for that external image.
• NotificationHandler
  A handler to notify when a transaction reaches certain stages of the rendering pipeline.
• OutputImageHandler
  Allows callers to receive a texture with the contents of a specific pipeline copied to it.
• RenderNotifier
  A handler to integrate WebRender with the thread that contains the Renderer.

Type Aliases

• BlobImageData
  Backing store for blob image command streams.
• BlobImageResult
  Result type for blob raserization.
• DocumentLayer
  Documents are rendered in the ascending order of their associated layer values.
• GlyphIndex
• ItemTag
  A tag that can be used to identify items during hit testing. If the tag is missing then the item doesn’t take part in hit testing at all. This is composed of two numbers. In Servo, the first is an identifier while the second is used to select the cursor that should be used during mouse movement. In Gecko, the first is a scrollframe identifier, while the second is used to store various flags that APZ needs to properly process input events.
• PipelineSourceId
  This type carries no valuable semantics for WR. However, it reflects the fact that clients (Servo) may generate pipelines by different semi-independent sources. These pipelines still belong to the same IdNamespace and the same DocumentId. Having this extra Id field enables them to generate PipelineId without collision.
• TileSize
  Width and height in device pixels of image tiles.
• VoidPtrToSizeFn
  A C function that takes a pointer to a heap allocation and returns its size.