Struct WasmImageProcessor 

pub struct WasmImageProcessor;

WASM bindings for canvas operations

Implementations

impl WasmImageProcessor

pub fn create_image_data( data: &[u8], width: u32, height: u32, ) -> Result<ImageData, JsValue>

Creates ImageData from RGBA bytes

pub fn compute_histogram( data: &[u8], width: u32, height: u32, ) -> Result<String, JsValue>

Computes histogram as JSON

Returns a comprehensive JSON object containing:

• Image dimensions (width, height, total_pixels)
• Per-channel histograms (red, green, blue, luminance)
• Statistics for each channel (min, max, mean, median, std_dev, count)
• Histogram bins (256 bins for 8-bit values)

Example JSON Output

{
  "width": 256,
  "height": 256,
  "total_pixels": 65536,
  "red": {
    "bins": [0, 100, 200, ...],
    "min": 0,
    "max": 255,
    "mean": 127.5,
    "median": 128,
    "std_dev": 73.9,
    "count": 65536
  },
  "green": { ... },
  "blue": { ... },
  "luminance": { ... }
}

pub fn compute_histogram_with_bins( data: &[u8], width: u32, height: u32, bin_edges: &[f64], ) -> Result<String, JsValue>

Computes histogram with custom bin ranges

This allows for non-uniform bin widths, useful for specific analysis needs such as focusing on particular value ranges or creating logarithmic bins.

Arguments

• data - RGBA image data
• width - Image width
• height - Image height
• bin_edges - Array of bin edge values (n+1 edges for n bins)

Example

// Create 5 bins: [0-50), [50-100), [100-150), [150-200), [200-256)
const binEdges = [0, 50, 100, 150, 200, 256];
const histogram = WasmImageProcessor.computeHistogramWithBins(data, width, height, binEdges);

pub fn compute_stats( data: &[u8], width: u32, height: u32, ) -> Result<String, JsValue>

Computes statistics as JSON

pub fn linear_stretch( data: &mut [u8], width: u32, height: u32, ) -> Result<(), JsValue>

Applies linear stretch

pub fn histogram_equalization( data: &mut [u8], width: u32, height: u32, ) -> Result<(), JsValue>

Applies histogram equalization

Trait Implementations

impl From<WasmImageProcessor> for JsValue

fn from(value: WasmImageProcessor) -> Self

Converts to this type from the input type.

impl FromWasmAbi for WasmImageProcessor

type Abi = u32

The Wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: u32) -> Self

Recover a Self from Self::Abi.

impl IntoWasmAbi for WasmImageProcessor

type Abi = u32

The Wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> u32

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl LongRefFromWasmAbi for WasmImageProcessor

type Abi = u32

Same as RefFromWasmAbi::Abi

type Anchor = RcRef<WasmImageProcessor>

Same as RefFromWasmAbi::Anchor

unsafe fn long_ref_from_abi(js: Self::Abi) -> Self::Anchor

Same as RefFromWasmAbi::ref_from_abi

impl OptionFromWasmAbi for WasmImageProcessor

fn is_none(abi: &Self::Abi) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionIntoWasmAbi for WasmImageProcessor

fn none() -> Self::Abi

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl RefFromWasmAbi for WasmImageProcessor

type Abi = u32

The Wasm ABI type references to Self are recovered from.

type Anchor = RcRef<WasmImageProcessor>

The type that holds the reference to Self for the duration of the invocation of the function that has an &Self parameter. This is required to ensure that the lifetimes don’t persist beyond one function call, and so that they remain anonymous.

unsafe fn ref_from_abi(js: Self::Abi) -> Self::Anchor

Recover a Self::Anchor from Self::Abi.

impl RefMutFromWasmAbi for WasmImageProcessor

type Abi = u32

Same as RefFromWasmAbi::Abi

type Anchor = RcRefMut<WasmImageProcessor>

Same as RefFromWasmAbi::Anchor

unsafe fn ref_mut_from_abi(js: Self::Abi) -> Self::Anchor

Same as RefFromWasmAbi::ref_from_abi

impl TryFromJsValue for WasmImageProcessor

fn try_from_js_value(value: JsValue) -> Result<Self, JsValue>

Performs the conversion.

fn try_from_js_value_ref(value: &JsValue) -> Option<Self>

Performs the conversion.

impl VectorFromWasmAbi for WasmImageProcessor

type Abi = <Box<[JsValue]> as FromWasmAbi>::Abi

unsafe fn vector_from_abi(js: Self::Abi) -> Box<[WasmImageProcessor]>

impl VectorIntoWasmAbi for WasmImageProcessor

type Abi = <Box<[JsValue]> as IntoWasmAbi>::Abi

fn vector_into_abi(vector: Box<[WasmImageProcessor]>) -> Self::Abi

impl WasmDescribe for WasmImageProcessor

fn describe()

impl WasmDescribeVector for WasmImageProcessor

fn describe_vector()

impl SupportsConstructor for WasmImageProcessor

impl SupportsInstanceProperty for WasmImageProcessor

impl SupportsStaticProperty for WasmImageProcessor