Crate zenresize 

High-quality image resampling with 31 filters, streaming API, and SIMD acceleration.

zenresize provides a standalone resize library extracted from the zenimage/imageflow image processing pipeline. It supports:

• All 31 resampling filters from imageflow (Lanczos, Robidoux, Mitchell, etc.)
• Row-at-a-time streaming API with V-first pipeline for pipeline integration
• Built-in sRGB/linear conversion and alpha premultiply/unpremultiply
• u8, i16, and f32 pixel format support
• archmage-based SIMD (AVX2+FMA on x86, NEON on ARM)

Quick Start

use zenresize::{Resizer, ResizeConfig, Filter, PixelDescriptor};

// Create a 4×4 RGBA test image
let input_pixels = vec![128u8; 4 * 4 * 4];

let config = ResizeConfig::builder(4, 4, 2, 2)
    .filter(Filter::Lanczos)
    .format(PixelDescriptor::RGBA8_SRGB)
    .build();

let output = Resizer::new(&config).resize(&input_pixels);
assert_eq!(output.len(), 2 * 2 * 4);

Re-exports

pub use plane::PlaneResizer;

pub use composite::Background;

pub use composite::CompositeError;

pub use composite::NoBackground;

pub use composite::SliceBackground;

pub use composite::SolidBackground;

pub use composite::StreamedBackground;

pub use composite::composite_over_premul;

pub use composite::composite_over_solid_opaque_premul;

pub use composite::composite_over_solid_premul;

pub use composite::unpremultiply_f32_row;

Modules

composite

Compositing for blending resized images onto backgrounds.

plane

Single-plane i16 image resizer.

Structs

At

An error with location tracking - wraps any error type.

Bt709

BT.709 transfer function (also used for BT.601).

Hlg

HLG (Hybrid Log-Gamma) transfer function for broadcast HDR.

LinearGradientMask

Linear gradient mask.

MaskSpan

A contiguous horizontal span with uniform mask behavior.

MaskSpans

Inline collection of mask spans for one row.

NoTransfer

Identity transfer function: no conversion.

Padding

Padding to add around the resized output.

PixelDescriptor

Compact pixel format descriptor.

Pq

SMPTE ST 2084 (PQ) transfer function for HDR10 content.

RadialGradientMask

Radial gradient mask.

ResizeConfig

Resize configuration built with ResizeConfigBuilder.

ResizeConfigBuilder

Builder for ResizeConfig.

Resizer

Reusable resizer with pre-computed weight tables.

RoundedRectMask

Antialiased rounded rectangle mask.

SourceRegion

Region of the source image to use for resizing.

Srgb

sRGB transfer function.

StreamingResize

Streaming resize state machine.

Enums

AlphaMode

Alpha channel interpretation.

BlendMode

Porter-Duff and artistic blend modes.

ChannelLayout

Channel layout (number and meaning of channels).

ChannelType

Channel storage type.

Filter

Named interpolation filter presets.

LobeRatio

Negative-lobe ratio control for resampling weights.

MaskFill

Result of filling a mask row. Enables skipping work on uniform rows.

OrientOutput

Post-resize orientation transform.

SpanKind

What kind of pixels a span contains.

StreamingError

Errors from streaming resize push operations.

TransferFunction

Encoding transfer function (OETF).

WorkingFormat

The internal working format of the streaming resizer.

Traits

Element

Pixel element type.

MaskSource

Row-level mask generator.

ResultAtExt

Extension trait for adding location tracking to Result<T, At<E>>.

TransferCurve

Transfer function for encoding/decoding pixel values to/from linear light.

Functions

mask_pixel_align

Preferred pixel alignment for mask span boundaries on the current platform.

resize_3ch

Resize a 3-channel u8 image. Works with rgb::RGB<u8>, rgb::BGR<u8>, etc.

resize_4ch

Resize a 4-channel u8 image. Works with any pixel type that implements ComponentSlice (RGBA, BGRA, ARGB, ABGR from the rgb crate).

resize_gray8

Resize a grayscale u8 image.

resize_hfirst_streaming

H-first streaming resize for sRGB u8 4ch.

resize_hfirst_streaming_f32

H-first streaming resize for the f32 path (any channel count).