- RawImage::develop demosaics only the default crop with AHD when there
is no OpcodeList3 (ahd_window), instead of demosaicing the margin too
and then copying the crop out of the full picture on one thread.
- Gpu::upload writes through queue.write_buffer_with and copies into
the staging buffer in parallel parts. create_buffer_init zeroed a
staging buffer and then copied over it, two single-threaded passes
over a full-size photo's ~290 MB.
- finish_and_read copies the mapped readback out in parallel parts (one
thread read the 91 MB of a 24 MP export at ~2 GB/s, ~45 ms).
Output is byte-identical (ahd_window_is_the_crop_of_the_whole,
uploads_read_back_exactly).
Export of a 24 MP ARW to full-size JPEG (examples/export_bench, 75
interleaved runs each on a shared 16-thread Ryzen):
main 802 ms median / 614 ms min -> this branch 647 / 525 (-19.3% / -14.5%).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- finish_8bit/finish_deep hand back the render itself when there is no
output sharpening and no watermark. Before, every export cloned the
image (~100 MB at 24 MP) and output_sharpen built a ~290 MB float copy
of it even for SharpenFor::None, all on one thread.
- Output sharpening's box blurs run row-parallel (par_rows); each pixel
is computed as before.
- The parallel JPEG encoder converts each band's rows to YCbCr inside the
band's task instead of first filling whole-image planes (~290 MB for
4:4:4 at 24 MP, written once and read back).
- fdct_quant rounds with plain arithmetic (round_i16) instead of
f32::round, a libm call per coefficient without SSE4.1; it equals
`x.round() as i16` for all 2^32 inputs.
Output is byte-identical (pinned by encoded_bytes_are_pinned and
sharpened_pixels_are_pinned, whose hashes come from main).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
examples/export_bench imports the files given and runs export_photo
(decode, full-size render, encode) N times, forgetting the decoded
original between runs like a batch export does, and prints the median
and minimum wall time. OPT takes export options as app.export JSON,
PHASES=1 times render and encode separately, OUT=dir writes the files
for byte comparisons between builds.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
