Module ops 

Pixel operations — scalar, bounds-checked, and the oracle for every faster twin.

The conversions and downscales a camera pipeline needs moved to rusty_esp_dsp::pixel (D0, 2026-09-02) and are re-exported here at the paths this crate always had, so a caller sees no change; the crop and rotate helpers, which only this crate uses, stay. Colour conversion is BT.601 full-range (the JFIF convention), fixed-point with an 8-bit fraction — the same arithmetic on every platform.

Functions

crop

Crop a packed frame to the rectangle at (x, y) of size w×h.

downscale2x_gray8

2× box downscale of a Gray8 image; odd trailing rows/columns are dropped. Returns the output geometry.

downscale2x_rgb565

2× box downscale of an RGB565 (LE) image, per channel.

pack_rgb565

Pack an RGB888 pixel as little-endian RGB565.

rgb565_to_rgb888

RGB565 (LE) → RGB888. src holds pixels × 2 bytes, dst pixels × 3.

rgb888_to_rgb565

RGB888 → RGB565 (LE).

rotate90_gray8

Rotate a Gray8 image 90° clockwise. Output is height×width.

rotate180

Rotate a packed image 180° in place-compatible fashion (into dst).

unpack_rgb565

Unpack a little-endian RGB565 pixel to RGB888, replicating the top bits into the low bits so white stays white.

yuv_to_rgb

BT.601 full-range YCbCr → RGB888, fixed-point.

yuyv_to_gray8

YUYV → Gray8: the luma bytes.

yuyv_to_rgb565

YUYV → RGB565 (LE).

yuyv_to_rgb888

YUYV (Y0 U Y1 V) → RGB888. src holds pixels × 2 bytes (pixels even).