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This is the first step of RFC-0032 (storytold/craft-contrib#50, rfcs/0032-shared-pbr-crates.md, the craft-texture row). It adds the crate craft-texture (crates/texture) with MaterialCraft's linear float image planes and their sampling. The code comes from MaterialCraft crates/image/src/lib.rs at 3133062, with its six tests unchanged. No app uses the crate yet. MaterialCraft switches to it in a later pull request.
Image is a gray or RGBA plane of f32, row-major with the top row first, shared through an Arc. Its fields are private, with width(), height(), kind(), data() and shared_data() getters, so every Image has nonzero sides and a buffer of exactly width × height × channels floats.
Limits (max_side 8192, max_pixels 2^26, max_bytes 1 GiB) is checked in u64 with checked multiplication before anything is allocated. try_filled, try_generate, try_generate_uv and from_data return an ImageError (BadSize, TooLarge, BadDataLength, OutOfMemory), and try_map, try_to_kind, try_resize and try_to_rgba8_display reserve their memory first. try_resize and try_to_kind check the result against the limits also when they return the image unchanged. The moved constructors without try_ still clamp each side to 1..=8192.
sample (bilinear) and sample_nearest take (u, v) with (0, 0) at the upper-left corner, as glTF 2.0 section 3.8.3 defines it: "(0, 0) corresponds to the upper left corner" (glTF 2.0). tile selects repeat (glTF REPEAT, 10497) or clamp to edge (CLAMP_TO_EDGE, 33071) on both axes. The texel coordinate (u × width − 0.5 for linear, floor(u × width) for nearest), the wrapping and the four bilinear weights follow the Vulkan specification, sections 20.4.1, 20.6.1 and 20.6.3 (texel coordinates, wrapping, filtering).
rayon is behind a parallel feature, off by default, and the crate builds for wasm32-unknown-unknown with and without it.
The crate README has Origin and Migration tables, and the root README.md and Cargo.toml list the crate. No workflow checks the crate for wasm32 yet; adding it to the wasm32 matrix is a separate pull request.
Faults fixed in the moved code, each with a test:
An Image built by hand with a zero side panicked in get and sample (rem_euclid(0), clamp(0, -1)), and mean divided by zero. A buffer of the wrong length was read with defaults. Private fields and from_data rule both out.
Repeat clamped the texel coordinate to ±1e9, which changed the repeat period for large finite u, and nearest saturated the i64 cast near 1e19. The normalized coordinate is now reduced first: its fractional part when repeating, kept below 1 so that a tiny negative u stays on the last texel, and -1..=2 when clamping.
Bilinear used a + (b - a) * t, which gave NaN at a texel center next to an infinite texel and overflowed between f32::MAX and -f32::MAX. It now sums the four weighted texels and skips texels of weight zero.
The box shrink in resize summed in f32 and overflowed for large HDR values. It sums in f64.
generate_uv took the pixel-center step from the unclamped size, so a side over 8192 gave centers that stop short of 1.
linear_to_srgb(NaN) returned −0.055. It returns NaN.
Non-finite pixels are stored as given: to_rgba8_display writes NaN as 0 and clamps, range skips NaN, and mean returns NaN.
Validation
New tests in crates/texture/src/lib.rs. Each of these fails without its fix:
nearest_follows_the_texel_floor and bilinear_weights_follow_the_fractional_texel_coordinate check the results against the formulas above. small_negative_coordinates_repeat_to_the_last_texel checks that the reduction keeps a tiny negative u on the last texel. non_finite_pixels_have_defined_results and whole_factor_shrink_stays_exact_with_custom_limits pin the non-finite pixel results and the exact box shrink. The six moved tests (sample_survives_huge_coordinates, resource_keys_round_trip, sample_wraps_and_clamps, resize_box_and_bilinear, hostile_sizes_are_clamped, conversions) pass unchanged.
On main at b5b8a77:
cargo fmt --all -- --check
cargo clippy -p craft-texture --all-targets -- -D warnings, and with --all-features
cargo test -p craft-texture (23 passed), and with --features parallel (23 passed)
cargo check --locked -p craft-texture --target wasm32-unknown-unknown, and with --features parallel
cargo check --locked --workspace --tests
Summary by CodeRabbit
New Features
Added a texture library for grayscale and RGBA images, with sampling, resizing, color conversion, and display output.
Added configurable image size limits and fallible operations that report invalid sizes or allocation failures.
Added optional parallel processing support.
Documentation
Added usage and feature documentation for the texture library, including sampling behavior and image size limits.
Adds crates/texture (craft-texture), the first step of RFC-0032
(storytold/craft-contrib#50). The code comes from MaterialCraft
crates/image/src/lib.rs at 31330629, with its six tests unchanged. No app
uses the crate yet.
Changes from the source:
- Image fields are private; from_data checks the size and the buffer
length, so a zero side can no longer reach a panic and a short buffer
is rejected instead of read with defaults.
- Limits caps the side, pixels and bytes; the try_ constructors and
try_map, try_to_kind, try_resize and try_to_rgba8_display reserve
memory first and return an error.
- Repeat sampling reduces the coordinate to its fractional part, so the
period holds at large coordinates.
- Bilinear sampling sums the four weighted texels and skips zero weights;
box shrinking sums in f64.
- generate_uv clamps the size before computing pixel centers.
- linear_to_srgb(NaN) returns NaN.
- rayon is behind the parallel feature.
Reviewing files that changed from the base of the PR and between 261e7a4 and 47baffe.
Files selected for processing: 2
crates/texture/README.md
crates/texture/src/lib.rs
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Walkthrough
The PR adds craft-texture, a Rust library for linear-float grayscale and RGBA images. It provides bounded construction, sampling, resizing, image and display conversions, resource-key helpers, tests, and documentation.
Changes: Image library
Layer / File(s)
Summary
Image limits and construction crates/texture/src/lib.rs, crates/texture/Cargo.toml, Cargo.toml, crates/texture/README.md
The crate adds image types, size and allocation checks, and infallible and fallible constructors. The workspace declares the crate dependency. The crate README describes construction, limits, features, and migration details.
Sampling and kind conversion crates/texture/src/lib.rs
Images support wrapped or clamped lookup, nearest and bilinear sampling, mapping, and grayscale or color conversion. Tests cover sampling behavior and conversions.
Resizing, output, and validation crates/texture/src/lib.rs, crates/texture/README.md, README.md
The crate adds resizing, RGBA8 display output, image statistics, color-space conversion, and resource-key helpers. Tests cover these operations and boundary cases. The READMEs describe the crate and its APIs.
This adds a new image library that nothing uses yet, so the blast radius is small. Two minor issues are still open: the allocation-failure documentation overstates the try_ guarantee, and bilinear sampling can return infinity for extreme HDR values. Both are low-risk and can be fixed before or shortly after merge.
Pre-merge checks: 4
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The title names the main change: adding the craft-texture crate with bounded f32 image planes and texture sampling. The raw summary confirms a new crate with image planes, size limits, and nearest/bil…
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The title names the main change: adding the craft-texture crate with bounded f32 image planes and texture sampling. The raw summary confirms a new crate with image planes, size limits, and nearest/bilinear sampling. The title is specific and matches the changeset.
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crates/texture/README.md
crates/texture/src/lib.rs
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Actionable comments posted: 2
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @crates/texture/src/lib.rs:
- Around line 18-20: Update the allocation guarantee in the crate documentation
and affected try_ method docs to promise OutOfMemory only when pixel-buffer
reservation fails; identify remaining infallible allocations, including Arc::new
in constructors and Box::new in try_resize, without implying those failures are
returned as ImageError.
- Line 314: Update the bilinear accumulation in sample to use f64 intermediates,
then clamp finite results to the f32 range when converting back; preserve
propagation of infinite texels. Add a regression assertion for a constant 2×2
image of f32::MAX sampled at u = v = 0.5 + 2^-24, verifying the result is finite
and equals f32::MAX.
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Cargo.toml
README.md
crates/texture/Cargo.toml
crates/texture/README.md
crates/texture/src/lib.rs
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…are raised
With raised Limits, a gray image over 512 MiB could be converted to
color on wasm32, where the color plane needs more than isize::MAX bytes
and vec! panics with capacity overflow.
- Limits::check returns TooLarge when the byte count is over isize::MAX,
so the try_ forms report the size instead of OutOfMemory.
- map, to_color and to_kind clamp each side to 1..=MAX_SIDE when the
result would be over isize::MAX bytes, and map the top-left part.
- The size checks are pure functions that take the bound as a value, and
three tests check them against the 32-bit bound without allocating.
Pushed 261e7a4: on 32-bit targets such as wasm32, an image allowed by raised Limits could make map, to_color or to_kind ask vec! for more than isize::MAX bytes and panic. Limits::check now also refuses a byte count over isize::MAX (computed with checked math), so the try_ forms return TooLarge. Over that bound, map clamps each side to 8192, the same per-side clamp resize uses. With the default limits nothing changes. Three new tests cover it without allocating an image. cargo test -p craft-texture passes 26 with and without --all-features, and the wasm32 check passes. The branch still merges cleanly with main.
The four weighted texels are summed in f64 and a finite sum is clamped
to the f32 range. Rounded weights can add up to slightly more than 1,
which made a constant image of f32::MAX sample to infinity at some
coordinates. Infinite texels still give an infinite or NaN sample.
The crate docs and README now limit the OutOfMemory guarantee of the
try_ forms to the pixel buffer, and name the Arc and the try_resize
resampler as allocations that are not fallible.
…hared
Image equality no longer short-cuts on a shared buffer. An image holding
NaN compared equal to its clone but unequal to the same image built
again; it is now unequal to both, as f32 comparison gives.
Pushed 316db97, which answers the two review threads, and 47baffe: Image equality no longer short-cuts on a shared buffer, so an image holding NaN is unequal to its clone as well as to a rebuilt copy, as f32 comparison gives. The branch still merges cleanly with main at f9f9e11.
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Summary
This is the first step of RFC-0032 (storytold/craft-contrib#50,
rfcs/0032-shared-pbr-crates.md, thecraft-texturerow). It adds the cratecraft-texture(crates/texture) with MaterialCraft's linear float image planes and their sampling. The code comes from MaterialCraftcrates/image/src/lib.rsat3133062, with its six tests unchanged. No app uses the crate yet. MaterialCraft switches to it in a later pull request.Imageis a gray or RGBA plane off32, row-major with the top row first, shared through anArc. Its fields are private, withwidth(),height(),kind(),data()andshared_data()getters, so everyImagehas nonzero sides and a buffer of exactly width × height × channels floats.Limits(max_side8192,max_pixels2^26,max_bytes1 GiB) is checked inu64with checked multiplication before anything is allocated.try_filled,try_generate,try_generate_uvandfrom_datareturn anImageError(BadSize,TooLarge,BadDataLength,OutOfMemory), andtry_map,try_to_kind,try_resizeandtry_to_rgba8_displayreserve their memory first.try_resizeandtry_to_kindcheck the result against the limits also when they return the image unchanged. The moved constructors withouttry_still clamp each side to1..=8192.sample(bilinear) andsample_nearesttake(u, v)with(0, 0)at the upper-left corner, as glTF 2.0 section 3.8.3 defines it: "(0, 0) corresponds to the upper left corner" (glTF 2.0).tileselects repeat (glTFREPEAT, 10497) or clamp to edge (CLAMP_TO_EDGE, 33071) on both axes. The texel coordinate (u × width − 0.5for linear,floor(u × width)for nearest), the wrapping and the four bilinear weights follow the Vulkan specification, sections 20.4.1, 20.6.1 and 20.6.3 (texel coordinates, wrapping, filtering).rayonis behind aparallelfeature, off by default, and the crate builds forwasm32-unknown-unknownwith and without it.README.mdandCargo.tomllist the crate. No workflow checks the crate for wasm32 yet; adding it to the wasm32 matrix is a separate pull request.Faults fixed in the moved code, each with a test:
Imagebuilt by hand with a zero side panicked ingetandsample(rem_euclid(0),clamp(0, -1)), andmeandivided by zero. A buffer of the wrong length was read with defaults. Private fields andfrom_datarule both out.u, and nearest saturated thei64cast near 1e19. The normalized coordinate is now reduced first: its fractional part when repeating, kept below 1 so that a tiny negativeustays on the last texel, and-1..=2when clamping.a + (b - a) * t, which gave NaN at a texel center next to an infinite texel and overflowed betweenf32::MAXand-f32::MAX. It now sums the four weighted texels and skips texels of weight zero.resizesummed inf32and overflowed for large HDR values. It sums inf64.generate_uvtook the pixel-center step from the unclamped size, so a side over 8192 gave centers that stop short of 1.linear_to_srgb(NaN)returned −0.055. It returns NaN.Non-finite pixels are stored as given:
to_rgba8_displaywrites NaN as 0 and clamps,rangeskips NaN, andmeanreturns NaN.Validation
New tests in
crates/texture/src/lib.rs. Each of these fails without its fix:repeat_keeps_its_period_at_large_coordinates,clamp_selects_the_edges_at_large_coordinatesbilinear_ignores_zero_weight_texels_and_does_not_overflow,box_shrink_averages_large_hdr_valuesgenerate_uv_spans_the_clamped_size,srgb_encoding_keeps_nanchecked_sizes_reject_zero_and_long_sides,checked_sizes_respect_the_pixel_and_byte_limits,checked_sizes_do_not_overflow,from_data_checks_the_length,fallible_operations_check_the_limits,unchanged_results_are_checked_against_the_limitsnearest_follows_the_texel_floorandbilinear_weights_follow_the_fractional_texel_coordinatecheck the results against the formulas above.small_negative_coordinates_repeat_to_the_last_texelchecks that the reduction keeps a tiny negativeuon the last texel.non_finite_pixels_have_defined_resultsandwhole_factor_shrink_stays_exact_with_custom_limitspin the non-finite pixel results and the exact box shrink. The six moved tests (sample_survives_huge_coordinates,resource_keys_round_trip,sample_wraps_and_clamps,resize_box_and_bilinear,hostile_sizes_are_clamped,conversions) pass unchanged.On
mainatb5b8a77:cargo fmt --all -- --checkcargo clippy -p craft-texture --all-targets -- -D warnings, and with--all-featurescargo test -p craft-texture(23 passed), and with--features parallel(23 passed)cargo check --locked -p craft-texture --target wasm32-unknown-unknown, and with--features parallelcargo check --locked --workspace --testsSummary by CodeRabbit