Replace chunked scratch-buffer approach with direct indexed writes
into the pre-allocated output. Simpler and faster in practice.
Co-Authored-By: Claude <noreply@anthropic.com>
Replace single-byte pushes with chunk-based processing: pre-allocate
zeroed output, shuffle 4 values at a time into a stack buffer, then
copy_from_slice each byte lane into the output.
Co-Authored-By: Claude <noreply@anthropic.com>
Process the difference step in reverse 16-byte chunks, reading both
curr and prev into local arrays before writing. This makes all 16
subtractions independent, enabling autovectorization (confirmed with
SSE2: movdqu + psubb).
Co-Authored-By: Claude <noreply@anthropic.com>
Replace the two near-identical floating-point predictor encoding
functions with a single fp_predict! macro parameterized on the float
type, using core::mem::size_of to derive the byte size.
Co-Authored-By: Claude <noreply@anthropic.com>
Add support for encoding TIFF images with the floating-point predictor,
which improves compression ratios for floating-point image data.
The floating-point predictor works by:
1. Converting floats to big-endian bytes
2. Shuffling bytes so all first bytes are together, all second bytes, etc.
3. Applying byte-level horizontal differencing across the buffer
This complements the existing decoding support for Predictor 3.
Supported types: Gray32Float, Gray64Float, RGB32Float, RGB64Float,
RGBA32Float, RGBA64Float, CMYK32Float, CMYK64Float.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Fax was commonly requested, so let's make it Just Work when tiff crate is used through `image` where it's difficult to fiddle with tiff crate features.
