JigSawed (Win16, Entertainment Pack, VB1)

Registry id wep16_jigsawed: test/binaries/wep16/WEP2/JIGSAWED.EXE with VBRUN100.DLL, picture files BRICKS.BMP, FISH.BMP, RUG.BMP, TANKER.BMP and TREES.BMP. It is a Visual Basic 1 program, so every control is a Thunder* class with a guest wndproc. ThunderCommandButton and ThunderLabel are shadowed onto the native BUTTON and STATIC wndprocs ($win16_shadow_command_button, 09e2-win16-dialog.wat).

Headless route (test/test-win16-jigsawed.js)

node test/run.js --app=wep16_jigsawed --max-batches=1500 --quiet-blocks --input=205:dlg-click:1,\
215:click:20:31,240:click:80:52,300:click:150:150,330:click:475:180,800:png:/tmp/board.png

• Batch 205 dismisses the startup About box. Since about September it opens at batch 198, not 172; a dlg-click before it exists logs NO DIALOG, and the About box then blocks the whole route. B:wait-dlg-control:1 waits for it robustly, but it delays every later event.
• Game > Open puts up the VB1 file picker. Select bricks.bmp at (150,150) and press OK at (475,180).
• The picture is scrambled into pieces using the guest clock. In this route a 108x59 piece sits at [226,203]-[334,262), and dragging it 60 px down moves it exactly.

Window layout after loading

• The main window is 0x10002 (maximized 640x480, client origin 4,42).
• The visible viewport is ThunderPictureBox 0x10006, 612x414 at (4,42), with a vertical scrollbar at x 616 and a horizontal one at y 456.
• The board is ThunderPictureBox 0x10007, 640x480, a child of 0x10006, scrolled to screen (-10,9).
• The game draws into a 640x480 AutoRedraw memory bitmap (CreateCompatibleBitmap / CreateCompatibleDC), then BitBlts piece rectangles to the viewport.

Fixed 2026-10-10

1. Thunder OK did nothing (f4f937b3f). The picker form is owned by the main window, so $button_wndproc's VCL heuristic posted CN_COMMAND (0xBD11) back to the button instead of WM_COMMAND to the form. That heuristic came in with 312d48941 (2026-08-26) and is now skipped under $is_win16.
2. USER.59 SetActiveWindow trapped (f4f937b3f). The form calls it on its owner after hiding. It now runs the Win16 focus/activation path and returns the previously active window.
3. The board covered the caption, menu and scrollbars (a00df147f). $gdi_win16_autopresent_child_bitmap attaches the 640x480 AutoRedraw bitmap as 0x10007's own surface, which is correct. But _clipRectForChildSurface in lib/renderer.js clipped a child surface only to the top-level frame. It now intersects every ancestor's client area.

Measured

• The board repaints only on input. Batches 850-1450 of the drag A/B saw 9 BitBlt and 3 FillRect calls in the drag arm and none in the control arm.
• --trace-win16 is the counter for this app, since Win16 apps report 0 Win32 API calls.
• Evidence: scratch/runs/20261010-wep16_jigsawed-piece-drag-ab.

Open

• While a piece is dragged, nothing is drawn at the cursor in the captures; the source spot goes black until release.
• Placing a piece into its solved slot has not been tested.