nextOS 3.0.0: Version bump, runtime resolution switching, drag smoothness, taskbar clock, and cursor/UI fixes by Copilot · Pull Request #9 · dynodevv/nextOS

Copilot · 2026-02-18T20:01:04Z

resize_canvas memory safety: Only update w->width/w->height after successful canvas allocation. Failed alloc now preserves both old canvas AND old dimensions, preventing out-of-bounds reads in draw_window().
CMOS RTC robustness: Check UIP (update-in-progress) bit before reading; handle 12-hour mode by stripping PM bit before BCD conversion and converting to 24-hour format.
Resolution input validation: Reject w/h outside 640×480–1920×1080 range before casting to uint32_t/uint16_t, preventing wrap/truncation into unexpected BGA register values.
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…lag fix, VSync page flipping, taskbar clock Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

…ove duplicate fb variable Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

… UTC offset UX Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

…RAM after Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Copilot

Pull request overview

This PR advances nextOS to 3.0.0 by adding runtime resolution switching (via BGA), improving frame/input ordering for smoother dragging and cursor rendering, and introducing a taskbar clock with persisted UTC offset/resolution settings.

Changes:

Add BGA-backed runtime resolution switching (fb_set_resolution() + compositor_set_resolution()) and persist resolution to disk via Settings.
Add taskbar clock (CMOS RTC) with cached reads and a Settings “Clock” tab for UTC offset persistence.
Adjust main loop ordering to process mouse input before rendering and draw the cursor into the backbuffer before fb_swap().

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
kernel/ui/compositor.h	Exposes new compositor APIs for resolution switching and UTC offset.
kernel/ui/compositor.c	Implements taskbar clock caching, UTC offset handling, resolution switching, and removes cursor draws from mouse handler paths.
kernel/gfx/framebuffer.h	Adds `fb_set_resolution()` API and updates header description.
kernel/gfx/framebuffer.c	Implements BGA probing and register programming for runtime mode switching; keeps swap as backbuffer→VRAM copy.
kernel/kernel.c	Bumps version/heap size; reorders main loop for smoother input/render/cursor swap.
apps/settings/settings.c	Extends persisted settings (resolution + UTC offset), adds Clock tab, and improves mouse speed slider UX.
kernel/net/net_stack.c	Updates HTTP/HTTPS User-Agent version string to 3.0.0.
apps/browser/browser.c	Updates homepage strings to 3.0.0.

Copilot · 2026-02-20T21:33:57Z

+    uint32_t *new_canvas = (uint32_t *)kmalloc(cw * ch * 4);
+    if (new_canvas) {
        for (int p = 0; p < cw * ch; p++)
-            w->canvas[p] = 0xF0F0F0;
+            new_canvas[p] = 0xF0F0F0;
+        if (w->canvas) kfree(w->canvas);
+        w->canvas = new_canvas;
    }
+    /* If alloc failed, keep old canvas — better than white screen */
    w->width = new_w;
    w->height = new_h;
 }


resize_canvas() updates w->width/w->height even when the new canvas allocation fails and the old canvas is kept. draw_window() uses win->width/height to compute the source canvas dimensions (cw/ch) and will then index win->canvas using the new cw/ch, which can read past the old allocation and corrupt memory. Consider only updating width/height after a successful resize, or tracking canvas dimensions separately so failed resizes keep dimensions consistent with the existing canvas.

Fixed in dea0dcc — w->width and w->height are now only updated inside the if (new_canvas) block, so a failed allocation preserves both the old canvas and its matching dimensions.

Copilot · 2026-02-20T21:33:58Z

+        if (now - clock_last_read >= 1000) {
+            clock_last_read = now;
+            outb(0x70, 0x0B); uint8_t regb = inb(0x71);
+            outb(0x70, 0x04); uint8_t hour = inb(0x71);
+            outb(0x70, 0x02); uint8_t min  = inb(0x71);
+            if (!(regb & 0x04)) {
+                hour = (hour >> 4) * 10 + (hour & 0x0F);
+                min  = (min >> 4) * 10 + (min & 0x0F);
+            }
+            /* Apply UTC offset */
+            int h = (int)hour + clock_utc_offset;
+            if (h < 0) h += 24;
+            if (h >= 24) h -= 24;
+            cached_hour = (uint8_t)h;
+            cached_min  = (min <= 59) ? min : 0;


CMOS RTC reads here don’t guard against the update-in-progress (UIP) window and don’t handle 12-hour mode/PM bit. If the RTC is in 12-hour format, the hour register’s high bit can indicate PM and the BCD conversion will produce invalid hours (e.g., 0x81 → 81). Consider waiting until register A bit 7 is clear (and/or doing a stable double-read) and normalizing hour based on reg B’s 12/24-hour flag before applying the UTC offset.

Fixed in dea0dcc — now checks register A bit 7 (UIP) before reading, strips the PM bit (0x80) from hour before BCD conversion when in 12-hour mode, and converts 12h→24h using reg B bit 1.

Copilot · 2026-02-20T21:33:58Z

+int compositor_set_resolution(int w, int h)
+{
+    if (fb_set_resolution((uint32_t)w, (uint32_t)h) != 0)
+        return -1;
+
+    /* Update mouse bounds to new resolution */
+    mouse_set_bounds(w, h);
+


compositor_set_resolution() casts w/h to uint32_t (and fb_set_resolution further casts to uint16_t) without validating inputs. A negative or very large w/h can wrap/truncate into unexpected hardware register values and lead to incorrect allocations. Consider validating w/h are positive and within the supported/safe range before calling fb_set_resolution().

Fixed in dea0dcc — compositor_set_resolution() now rejects w/h outside 640×480–1920×1080 before any casts or hardware register writes.

dynodevv · 2026-02-20T21:34:52Z

@copilot apply changes based on the comments in this thread

…ation Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Copilot · 2026-02-20T21:36:39Z

@copilot apply changes based on the comments in this thread

All three review comments addressed in dea0dcc:

resize_canvas() — width/height only updated on successful alloc
CMOS RTC — UIP guard + 12-hour mode handling added
compositor_set_resolution() — input range validation (640×480–1920×1080) before casts

Initial plan

c1054e9

Copilot AI assigned Copilot and dynodevv Feb 18, 2026

Copilot started work on behalf of dynodevv February 18, 2026 20:01 View session

Copilot AI and others added 2 commits February 18, 2026 20:12

Implement nextOS 3.0.0: version bump, BGA resolution switching, drag …

e0da8b3

…lag fix, VSync page flipping, taskbar clock Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Fix CMOS RTC read order: read format register before time values, rem…

1bc678b

…ove duplicate fb variable Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Update nextOS version to 3.0.0 and implement resolution settings~~ nextOS 3.0.0: BGA resolution switching, drag lag fix, VSync page flipping, taskbar clock Feb 18, 2026

Copilot AI requested a review from dynodevv February 18, 2026 20:18

Copilot finished work on behalf of dynodevv February 18, 2026 20:18

Copilot started work on behalf of dynodevv February 18, 2026 20:44 View session

Fix resolution persistence, clock timezone, and performance regression

39d25da

Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Copilot AI changed the title ~~nextOS 3.0.0: BGA resolution switching, drag lag fix, VSync page flipping, taskbar clock~~ Fix resolution persistence, clock timezone, and performance regression Feb 18, 2026

Copilot finished work on behalf of dynodevv February 18, 2026 20:52

Copilot started work on behalf of dynodevv February 19, 2026 14:11 View session

Fix performance: remove BGA page flipping, increase heap to 64MB, fix…

8432f70

… UTC offset UX Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Copilot AI changed the title ~~Fix resolution persistence, clock timezone, and performance regression~~ Fix performance regression, UTC offset UX, and fullscreen white screen at high resolutions Feb 19, 2026

Copilot finished work on behalf of dynodevv February 19, 2026 14:19

Copilot started work on behalf of dynodevv February 20, 2026 19:10 View session

Copilot AI and others added 2 commits February 20, 2026 19:14

Fix mouse slider drag and implement VRAM-direct cursor rendering

21fd92f

Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Extract speed_from_slider helper to deduplicate slider calculation

15c784a

Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Copilot AI changed the title ~~Fix performance regression, UTC offset UX, and fullscreen white screen at high resolutions~~ nextOS 3.0.0: Resolution switching, drag smoothness, VSync, taskbar clock, and follow-up fixes Feb 20, 2026

Copilot finished work on behalf of dynodevv February 20, 2026 19:17

Copilot started work on behalf of dynodevv February 20, 2026 21:23 View session

Fix cursor flickering: draw to backbuffer before fb_swap instead of V…

c5959d4

…RAM after Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Copilot AI changed the title ~~nextOS 3.0.0: Resolution switching, drag smoothness, VSync, taskbar clock, and follow-up fixes~~ nextOS 3.0.0: Version bump, runtime resolution switching, drag smoothness, taskbar clock, and cursor/UI fixes Feb 20, 2026

Copilot finished work on behalf of dynodevv February 20, 2026 21:26

dynodevv marked this pull request as ready for review February 20, 2026 21:29

Copilot AI review requested due to automatic review settings February 20, 2026 21:29

Copilot started reviewing on behalf of dynodevv February 20, 2026 21:29 View session

Copilot AI reviewed Feb 20, 2026

View reviewed changes

Copilot started work on behalf of dynodevv February 20, 2026 21:35 View session

Fix resize_canvas memory safety, RTC robustness, and resolution valid…

dea0dcc

…ation Co-authored-by: dynodevv <85120286+dynodevv@users.noreply.github.com>

Copilot finished work on behalf of dynodevv February 20, 2026 21:37

dynodevv merged commit 3561e0b into main Feb 20, 2026
1 check passed

dynodevv deleted the copilot/update-version-and-resolution-settings branch February 20, 2026 21:44

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nextOS 3.0.0: Version bump, runtime resolution switching, drag smoothness, taskbar clock, and cursor/UI fixes#9

nextOS 3.0.0: Version bump, runtime resolution switching, drag smoothness, taskbar clock, and cursor/UI fixes#9
dynodevv merged 9 commits intomainfrom
copilot/update-version-and-resolution-settings

Copilot AI commented Feb 18, 2026 •

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Copilot AI commented Feb 18, 2026 •

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