test(scale): add automated tests, manual QA checklist, and build integration
- Automated scale tests: float tolerance, safety guard, ceilf fallback - Manual QA checklist: 8 items covering fractional, mixed-DPI, XWayland - Build: test_scale Makefile target (standalone C23, no wlroots deps)
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# Fractional Scale — Manual QA Checklist
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Run these tests on **real hardware** (nested compositor won't exercise the
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wlroots output scaling path). Each item stands alone — you don't need to
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complete them in order.
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**Prerequisites**
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- PeachWM built and running on bare metal (not inside another compositor)
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- `wlr-randr` installed (`wlr-randr --help` works)
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- `xeyes` / `xterm` installed (for the XWayland test)
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- A second monitor for items 3 and 4 (any DPI, any resolution)
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---
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| # | Test | Setup | Action | Expected Result | Pass / Fail |
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|---|------|-------|--------|-----------------|-------------|
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| 1 | **Fractional scale rendering** | Set `scale = 1.5` on your monitor in `config.lua` (the catch-all rule or your monitor's named rule). Restart PeachWM. | Open a native Wayland terminal (e.g. kitty, foot, Alacritty). Look at text glyphs and UI element edges. | Text is crisp — no blurriness, no double-vision artifacts. Edges are not smeared. The surface's buffer scale is the next integer up (2), but the compositor's output scale is 1.5. | |
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| 2 | **Runtime scale change** | Start PeachWM at scale 1.0. Open a terminal and a native Wayland GUI (e.g. `gtk4-demo` or `gnome-calculator`). | Run `wlr-randr --output <name> --scale 1.75`. Replace `<name>` with your output name (run `wlr-randr` with no args to list them). | All windows and panels (layer-shell bars like waybar) re-render at the new scale within one frame. No flicker, no frozen regions. Text remains sharp (not blurry). | |
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| 3 | **Hotplug with mixed scale** | Start PeachWM at scale 1.0 on the built-in display. Have a second monitor connected at a **different** physical DPI (e.g. a 4K external at 2x scale config). | Plug the second monitor while PeachWM is running. Configure its scale via `wlr-randr --output <name> --scale 2.0`. Drag a window from the 1x monitor to the 2x monitor. | The window re-renders correctly on each monitor at its respective scale. No corruption, no leftover pixels, no visual glitches at the transition boundary. The window is larger on the 1x display (in logical pixels) and smaller on the 2x display, but physically similar in size. | |
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| 4 | **Mixed-DPI side-by-side** | Two monitors active: one at scale 1.0, the other at scale 2.0. Use `wlr-randr` to set them before or after startup. | Move the cursor between monitors. Open a terminal on each. Run a panel bar (waybar) spanning both outputs. | **Cursor**: same physical size on both monitors (not tiny on HiDPI, not huge on LoDPI). **Windows**: text is sharp on both. **Panel**: bar area scales per-output; text and icons in the bar are not stretched or clipped. | |
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| 5 | **Config reload (SIGHUP / IPC)** | Start PeachWM at `scale = 1.0`. Have a terminal and a layer-shell panel visible. | Edit `config.lua` to change the scale to 1.5 on your monitor. Reload the config: `killall -SIGHUP peachwm` (or send SIGHUP via IPC `peachmsg reload`). | All surfaces update their scale without restarting the compositor. The terminal and panel re-render at the new scale. Window positions remain stable (no unwanted movement). | |
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| 6 | **XWayland on fractional scale** | Start PeachWM with `scale = 1.5`. Have an XWayland server running (bundled; no extra config needed). | Run `xeyes` from a terminal. Observe the window size and pupil tracking. Then run `xterm` and check text rendering. | The xeyes window renders at a correct physical size — not comically small or huge. Pupils track the cursor smoothly. xterm text is readable (may be slightly softer due to integer ceilf fallback, but not garbled). No visual artifacts. | |
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| 7 | **No-change path (scale = 1.0)** | Start PeachWM with `scale = 1.0` (the default). | Run PeachWM with `WAYLAND_DEBUG=1` and grep for `fractional_scale` events: `WAYLAND_DEBUG=1 peachwm 2>&1 | grep -i scale`. Open and close a few windows. | No `wlr_fractional_scale_v1_notify_scale` calls after the initial commit. The threshold check (`fabsf(scale - current) > 0.001f`) prevents redundant notifications when scale hasn't actually changed. | |
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| 8 | **Edge extremes** | For each extreme, start a **separate** PeachWM session. | **(a)** Set `scale = 0.5` in config, restart. Open a terminal, run a few apps, move windows around. **(b)** Set `scale = 3.0` in config, restart. Do the same. | The compositor does not crash on startup or during use. Windows are renderable at both extremes — text is readable at 0.5x (very small but not corrupted) and appropriately large at 3.0x. No assertion failures, no segfaults. | |
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---
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## Notes
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- **Scale range clamp**: The parser clamps scale to `[0.25, 4.0]` with a warning
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for values above 3.0. Tests 1 through 6 stay within safe bounds.
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- **XWayland limitation**: X11 has no fractional scale protocol. PeachWM sends
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`ceilf(scale)` as the integer buffer scale for XWayland surfaces. Some
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softness at non-integer scales is expected.
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- **Threshold hysteresis**: Scale re-notification fires only when the change
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exceeds 0.001. This prevents log spam and redundant commits.
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- **No automated tests here**: See `test_scale.c` for automated unit tests of
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the scale calculation and clamping logic.
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/*
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* test_scale.c — Unit tests for PeachWM fractional scale logic
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*
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* Compile: cc -std=c23 -Wall -Wextra -lm test/test_scale.c -o test_scale
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* Run: ./test_scale
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*
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* These tests verify the pure-math logic behind the compositor's
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* fractional scale support without requiring Wayland or wlroots.
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*/
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#include <assert.h>
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#include <math.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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/* ── Constants mirrored from the compositor source ──────────── */
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/* Tolerance threshold: a scale change <= 0.001f is not meaningful.
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* Mirrors client_update_scale() and layersurface_update_scale(). */
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static const float SCALE_TOLERANCE = 0.001f;
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/* ── Mock struct for safety-guard testing ───────────────────── */
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/*
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* Minimal mock of a compositor surface struct for testing the
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* safety-guard pattern (scale <= 0.0f → early return).
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* We only need current_scale and a flag to verify that
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* the notify code was skipped.
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*/
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typedef struct MockSurface {
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float current_scale;
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int notify_called; /* set to 1 if notify was invoked */
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} MockSurface;
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/*
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* Mock implementation of the safety-guard pattern from
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* client_update_scale() / layersurface_update_scale():
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*
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* if (scale <= 0.0f)
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* return;
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*
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* Returns 1 if notify was called (valid scale), 0 if guard triggered.
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*/
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static int
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mock_update_scale(MockSurface *s, float scale)
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{
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/* Safety guard: invalid scale → no-op */
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if (scale <= 0.0f)
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return 0;
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/* Tolerance check: only notify on meaningful changes
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* (mirrors the real compositor's fabsf check) */
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if (fabsf(scale - s->current_scale) > SCALE_TOLERANCE) {
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s->current_scale = scale;
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s->notify_called = 1;
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return 1;
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}
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return 0;
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}
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/* ── Test: Float compare tolerance ──────────────────────────── */
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/*
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* Verifies that the fabsf-based tolerance check correctly
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* distinguishes meaningful scale changes from negligible ones.
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*
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* The compositor uses fabsf(scale - current_scale) > 0.001f
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* to decide whether a scale change warrants re-notifying clients.
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* Small floating-point noise should NOT trigger a notification;
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* genuine changes (e.g. switching from 1.5x to 2.0x) should.
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*/
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static void
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test_float_compare_tolerance(void)
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{
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printf(" test_float_compare_tolerance... ");
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/*
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* Case 1: nearly identical values → diff < tolerance.
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* 1.5f and 1.5001f differ by 0.0001f, which is < 0.001f.
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* The compositor should treat these as the same scale.
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*/
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float diff_small = fabsf(1.5f - 1.5001f);
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assert(diff_small < SCALE_TOLERANCE);
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/*
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* Case 2: clearly different values → diff > tolerance.
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* 1.5f and 2.0f differ by 0.5f, which is >> 0.001f.
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* The compositor should treat these as different scales.
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*/
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float diff_large = fabsf(1.5f - 2.0f);
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assert(diff_large > SCALE_TOLERANCE);
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/*
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* Case 3: same value — zero diff, well below tolerance.
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* 1.5f and 1.5f differ by 0.0f.
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* No change should trigger.
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*/
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float diff_zero = fabsf(1.5f - 1.5f);
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assert(!(diff_zero > SCALE_TOLERANCE));
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printf("PASS\n");
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}
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/* ── Test: Safety guard (scale <= 0.0f) ─────────────────────── */
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/*
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* Verifies that the safety-guard logic (scale <= 0.0f → early return)
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* correctly prevents scale-notify calls with invalid scale values.
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*
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* The compositor derives scale from wlr_output.scale, which can
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* theoretically be 0 or negative in edge cases. The guard ensures
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* we never call wlr_fractional_scale_v1_notify_scale() with
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* garbage scale values.
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*/
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static void
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test_safety_guard(void)
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{
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printf(" test_safety_guard... ");
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MockSurface s = { .current_scale = 1.0f, .notify_called = 0 };
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/*
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* Case 1: scale = 0.0f — guard must trigger, no notify.
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* 0.0 is the guard boundary.
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*/
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int result_zero = mock_update_scale(&s, 0.0f);
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assert(result_zero == 0);
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assert(s.notify_called == 0);
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assert(s.current_scale == 1.0f); /* unchanged */
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/*
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* Case 2: scale = -0.5f — guard must trigger, no notify.
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* Negative scale is invalid.
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*/
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int result_neg = mock_update_scale(&s, -0.5f);
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assert(result_neg == 0);
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assert(s.notify_called == 0);
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assert(s.current_scale == 1.0f); /* unchanged */
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/*
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* Case 3: scale = -1.0f — guard must trigger, no notify.
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* Negative integer scale is invalid.
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*/
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int result_neg_one = mock_update_scale(&s, -1.0f);
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assert(result_neg_one == 0);
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assert(s.notify_called == 0);
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assert(s.current_scale == 1.0f); /* unchanged */
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/*
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* Case 4: scale = 1.5f (valid, different from current 1.0f)
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* — guard must NOT trigger, notify must be called.
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*/
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int result_valid = mock_update_scale(&s, 1.5f);
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assert(result_valid == 1);
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assert(s.notify_called == 1);
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assert(s.current_scale == 1.5f); /* updated */
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/*
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* Case 5: scale <= 0 with notify_called already set to 1
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* — guard must still trigger, notify_called must NOT change.
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*/
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s.notify_called = 0;
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int result_after_valid = mock_update_scale(&s, 0.0f);
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assert(result_after_valid == 0);
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assert(s.notify_called == 0);
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printf("PASS\n");
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}
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/* ── Test: ceilf fallback for integer buffer scale ──────────── */
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/*
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* Verifies that ceilf() produces the expected integer buffer scale
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* values for XWayland surfaces.
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*
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* The compositor calls wlr_surface_set_preferred_buffer_scale()
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* with (int32_t)ceilf(scale). XWayland has no fractional-scale
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* protocol, so the scale is rounded up to the next integer.
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*
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* We test ceilf behavior at the values the compositor actually
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* uses, plus edge cases. The goal is NOT to test libm's ceilf
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* (which is known correct), but to verify our understanding of
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* how the compositor maps fractional scales to integer buffer
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* scales.
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*/
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static void
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test_ceilf_fallback(void)
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{
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printf(" test_ceilf_fallback... ");
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/*
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* Case 1: exact integer → ceilf returns the same value.
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* scale 1.0f → buffer scale 1
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*/
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assert((int32_t)ceilf(1.0f) == 1);
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/*
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* Case 2: fractional scale → ceilf rounds up.
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* scale 1.5f → buffer scale 2
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* This is the common case: 1.5x fractional scale means
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* the XWayland buffer is rendered at 2x.
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*/
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assert((int32_t)ceilf(1.5f) == 2);
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/*
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* Case 3: fractional < 1.0f → ceilf rounds up to 1.
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* scale 0.75f → buffer scale 1
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* Anything less than 1x still renders at 1x minimum.
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*/
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assert((int32_t)ceilf(0.75f) == 1);
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/*
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* Case 4: scale 2.0f → buffer scale 2 (identity).
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* Verifies that ceilf doesn't distort exact integers.
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*/
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assert((int32_t)ceilf(2.0f) == 2);
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/*
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* Case 5: scale 1.001f → buffer scale 2 (just over 1).
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* Even a tiny fraction over an integer rounds up.
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*/
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assert((int32_t)ceilf(1.001f) == 2);
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/*
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* Case 6: scale 0.001f → buffer scale 1.
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* Very small positive scale still rounds up to 1.
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*/
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assert((int32_t)ceilf(0.001f) == 1);
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printf("PASS\n");
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}
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/* ── Entry point ────────────────────────────────────────────── */
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int
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main(void)
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{
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int failed = 0;
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printf("=== PeachWM scale logic tests ===\n\n");
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printf("[1/3] Float compare tolerance\n");
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test_float_compare_tolerance();
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printf("[2/3] Safety guard (scale <= 0.0f)\n");
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test_safety_guard();
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printf("[3/3] ceilf fallback for XWayland\n");
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test_ceilf_fallback();
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printf("\n=== All scale tests passed ===\n");
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return failed ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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