Crate brushkit_preview 

Tip bitmaps for every brush file this workspace reads.

preview_abr, preview_brush and preview_brushset each take the whole file as bytes and return one PreviewEntry per brush in file order, available or not. A brush whose tip cannot be rendered is reported with a reason rather than dropped, so a caller can lay out a complete grid.

Every function here is pure over &[u8]: no filesystem, no threads, so the crate builds for wasm32-unknown-unknown.

Modules

procreate

Reading Procreate .brush and .brushset archives: the guarded zip and plist readers, the Shape.png decoder and the two name/member lookups the preview API needs.

Structs

ContactSheetConfig

GrayscaleBitmap

PreviewEntry

PreviewError

PreviewOptions

PreviewSet

SheetBrush

Enums

SheetBackground

TipImageError

TipPreview

UnavailableReason

Constants

MAX_IMPORT_DIMENSION

Functions

can_synthesize

decode_tip_image

Decode an imported brush-tip image (PNG/JPEG bytes) into a grayscale tip buffer. Alpha becomes intensity when the image has an alpha channel; otherwise luminance is inverted (dark = opaque), matching Photoshop’s convention.

downsample

Box-filter bitmap so its larger side is at most max_side (>= 1). Returns a clone when it already fits. Average of the covered source pixels per destination pixel, the same filter generate_preview_png uses.

generate_contact_sheet_png

generate_preview_png

A 200 px RGBA thumbnail: black ink, alpha from the tip’s gray value.

preview_abr

Tips for a Photoshop .abr pack.

preview_brush

The tip of a single Procreate .brush: one entry at index 0, read from the archive’s root rather than from a member directory.

preview_brushset

Tips for a Procreate .brushset.

synthesize_computed_tip

Rasterize a monochrome elliptical tip from computed-brush geometry.

tip_bitmap_of

Both formats use the same polarity — a Shape.png is white=stamp coverage and a TipBitmap is 255=full ink — so the pixels are copied unchanged.

to_grayscale