pdf-image: avoid intermediate sample allocations - #246
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Borrow eight-bit image samples directly from decoded input while retaining owned buffers for packed samples that require unpacking. Use the shared indexed palette expander in image decoding and remove the redundant pdf-image indexed helpers. Document its clamping and error behavior. Co-authored-by: Codex <codex@openai.com>
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Borrow eight-bit image samples directly from decoded input while retaining owned buffers for packed samples that require unpacking.
Use the shared indexed palette expander in image decoding and remove the redundant pdf-image indexed helpers. Document its clamping and error behavior.