Struct RenderStatistics 

pub struct RenderStatistics {
    pub frames: u64,
    pub frame_thread: usize,
    pub frame_kind: i32,
    pub frame_gl_major_version: i32,
    pub frame_width: i32,
    pub frame_height: i32,
    pub ticks: u64,
    pub tick_proxied_calls: Option<u64>,
    pub last_proxied_function: i64,
    pub canvases_released: u64,
    pub render_thread_panics: u64,
}

What the page can read about the frames that reached its canvases: how many, which thread drew the last one and to what, and what the ticks of a render thread cost the thread of the page.

Not from upstream. With a render worker nothing on the thread of the page sees a frame, so a page (a test, a diagnostic overlay of the host) that wants to know where rendering happens reads it here. The numbers are counted for all canvases of the module.

The fields are read one after the other from counters that the thread that renders goes on writing: two of them may belong to different frames.

Fields

frames: u64

The frames that were drawn to a canvas since the module started.

frame_thread: usize

The thread that drew the last frame, as current_thread names it there; 0 before the first frame, and always in a build without threads.

frame_kind: i32

The kind of the render target of the last frame: RENDER_TARGET_KIND_WEB_GL or RENDER_TARGET_KIND_SOFTWARE; 0 before the first frame.

frame_gl_major_version: i32

The major version of OpenGL ES the last frame was drawn with (2 for WebGL 1, 3 for WebGL 2); 0 for a frame drawn in memory.

frame_width: i32

The width of the last frame in device pixels.

frame_height: i32

The height of the last frame in device pixels.

ticks: u64

The ticks of the frame loop of a render thread since the module started. A tick renders a frame only when something changed. Ticks of the frame loop of the page are not counted.

tick_proxied_calls: Option<u64>

The calls the runtime carried from the render thread to the main thread of the page during those ticks (a call of the C library that only the main thread can serve: a line on the console, a file); None when the script of the thread does not count them. While such a call is served the render thread waits for the thread of the page.

last_proxied_function: i64

The index, in the table of the script of the module, of the function of the last such call; -1 when there was none.

canvases_released: u64

The canvases of closed views whose render target the thread that drew to them has released (RenderTargetBrowserSurface::dispose).

render_thread_panics: u64

The panics of the render thread since the module started. A frame that panics is caught by the render loop, which goes on with the next tick; each is reported to the thread of the page (RenderWorker).

Implementations

impl RenderStatistics

pub fn current() -> Self

The statistics as they are now. Any thread may ask.

Trait Implementations

impl Clone for RenderStatistics

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for RenderStatistics

impl Debug for RenderStatistics

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

Formats the value using the given formatter.

impl Default for RenderStatistics

fn default() -> Self

Returns the “default value” for a type.

impl Eq for RenderStatistics

impl PartialEq for RenderStatistics

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for RenderStatistics