2 Commits

Include renames

Author	SHA1	Message	Date
dtourolleandClaude Opus 5	cafa63ca6f	Let the develop column ask how wide it needs to be ... The column was 280px, a number chosen for a tablet, with 380px bolted on later for a desktop. Both were guesses at how much room the widest row inside needs, and a guess is what cannot work here: the mode strip is one chip per attribute the *operation set declares*, so the row is generated and no constant in app.slint can track it. When the guess came up short the failure was not a tidy clip. The Flickable inside the column never had its `viewport-width` set, so the viewport took its content's preferred width, and a viewport wider than its Flickable is *centred* in it — the same rule the note on the seam's `x: 0` already records a few lines below. So the column lost half of each edge rather than one of them: "HISTOGRAM" read "ISTOGRAM", "Straighten" read "aighten", Copy sat centred while Paste ran off the far side. It looked like a rendering fault and it was an alignment one. So the column asks instead of guessing. Every panel that can appear in it — image, histogram, geometry, settings transfer, masks, repairs, adjust, history — now publishes a `content-width`: how wide it has to be before it starts clipping itself, read off its own layout rather than asserted. Each declares that as its `min-width` too, and that is what makes the aggregation automatic: `column` is a layout, so it already reports the largest minimum among its children, and it does so for the panels that come and go with the mode as well, which live inside `if`s and cannot be named from outside. Grep `content-width` in ui/dr-ui/ui to see every panel with a say in the answer. The mode strip is named explicitly only because it is pinned outside that layout, so nothing else measures it. There is no floor left. A floor is one more guess and the panels state their own minimums now. The only thing still above the measurement is `panel-max-width`, which is not a size but a policy — a column may not take the window from the photograph it exists to serve — and it comes from Rust beside `layout-class` because a width read from `root.width` inside the layout that `root.width` depends on is a binding loop. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>	2026-08-27 21:23:44 +02:00
dtourolleandClaude Opus 5	0233df4bf2	See what the highlights are doing: a live histogram (FR-DSP-7) ... Exposure, blacks and whites were set by eye. Nothing said a highlight had blown — the canvas shows white where a channel is at 250 and white where it is at 255, and the difference is the whole question. **Counted on the GPU, not on the readback.** There is a full frame sitting in CPU memory on every canvas update right now — `AdjustPass::read_output`, the bridge spike S1 removes — and walking it would have been thirty lines and no shader. FR-DSP-7 states the mechanism and not just the feature: "these derive from a GPU-side reduction into a small buffer. Per-frame CPU readback of image data is prohibited." A histogram founded on the bridge would be correct today and deleted by S1, and would meanwhile be the reason the bridge could not go. What crosses the bus here is 4104 bytes whatever the image size. The reduction tallies into workgroup memory first and merges once per workgroup. A photograph is not noise: a clear sky puts tens of thousands of adjacent pixels in one bin, and contending for that single global atomic serialises the dispatch. **On the settled frame only.** `render_now` already knows whether a gesture is still moving — `draft` is the flag `redraw` derives from `was_coalesced` — so the dispatch and its transfer happen once when the slider stops rather than on each of the forty frames a drag emits. Nothing is lost: a histogram flickering past under a finger is not a reading anyone takes. FR-DSP-7 requires exactly this, that it not extend the FR-DSP-3 frame budget. Luma is weighted in 8.8 fixed point — 54, 183, 19, summing to 256 exactly — rather than in floats. Not thrift: it makes the shader's arithmetic reproducible bit for bit, which is what lets the test below be an `assert_eq` against a CPU count rather than a tolerance. ARCH §6.13's line about integer state, applied where it happens to also be free. **What the numbers were checked against.** A flat frame must put all 4096 pixels in one bin and one only. A 256-wide ramp must occupy every level with exactly the same count, which is what catches an off-by-one in the quantisation — a `floor` where a rounding was needed shifts the whole photograph one bin left and looks like nothing at all. And a 101x37 frame of seeded pseudo-random pixels — deliberately not a multiple of the 16x16 workgroup, so the edge tiles run off the image — is compared slot for slot against a second, obvious CPU implementation. Exact equality, no tolerance. The CPU version is a deliberate reimplementation rather than shared code: the bugs worth catching here are ones shared code would commit identically on both sides. Above that, the presentation arithmetic is unit-tested headless, because it is where a wrong answer is invisible. A histogram of the wrong shape looks exactly as plausible as one of the right shape. So: 64 columns because it divides 256 and an uneven fold draws an even ramp as a comb; the peak excludes the end columns, or a night scene scaled against its own black spike is a flat line with no information in it; heights are clamped into the plot; and "0%" is kept distinct from "<0.1%" and from "—", since an indicator reading "clipped" over a figure reading "none" is a panel contradicting itself. Clipping counts a *pixel* with any channel at an extreme, not a channel. Any, because a blown red has no gradation left in it however much green and blue still hold — and it is the saturated highlight, the sunset and the red jersey, that clips first and recovers worst. Per pixel, because counting channels can report 200% of a frame clipped, and a percentage above 100 is a readout nobody trusts again. Two affordances for it, which NFR-A11Y-3 asks for: a bar standing at the end of the plot the tones are piling against, and a figure saying how much. Either alone reads. The panel sits directly under the capture metadata and above every control, because it is what the controls are judged against. It is hand-built rather than generated, and ARCH §4.3a is untroubled: a histogram is not an operation — no parameters, changes nothing, answers a question rather than asking one — and nothing in it reads a parameter out of a descriptor. Three plot colours and a neutral luma trace join the palette. That is the swatch's exception rather than a second one: a per-channel histogram has to say which channel, and no achromatic treatment distinguishes red from blue, so the hue is data exactly as the image beside it is. Held well back from full strength for the reason the theme preamble gives. The bounded, non-parking map wait moves out of `AdjustPass` into `readback::await_mapping`, shared with the histogram's transfer. Thirty lines of load-bearing reasoning about frozen interfaces and lost devices, and two copies of it would have drifted. The histogram describes the frame on the canvas, so it is in the output colour space FR-DSP-7 asks for, and when zoomed it describes the visible region — a photographer inspecting a highlight at 4x is asking about that highlight. A device that cannot build the reduction loses the histogram and keeps the photograph. Still to do for FR-DSP-7: the pixel colour readout under the cursor. 324 tests pass, clippy and fmt clean. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-08-17 09:55:40 +02:00