gui_toolkit 0.12.0

Added

• Every CSS cursor: platform.Cursor has all the values of CSS Basic User Interface 4 (none, context-menu, help,
  progress, wait, cell, crosshair, vertical-text, alias, copy, no-drop, grab, grabbing,
  all-scroll, col-resize, row-resize, the eight one-way resizes, nesw-resize, nwse-resize, zoom-in,
  zoom-out) next to the seven it had, which keep their names (Arrow = default, Hand = pointer, Resize_H =
  ew-resize, Resize_V = ns-resize). cursor_from_css / cursor_css_name (CURSOR_CSS_NAMES) convert from / to the
  keyword (-webkit-grab and the other legacy names too).
• On Windows a cursor is the system's (IDC_*: the user's scheme and size) when Windows has it (cursor_system_id,
  cursor_source); the twelve it lacks (grab, grabbing, zoom-in, zoom-out, cell, copy, alias,
  context-menu, no-drop, vertical-text, col-resize, row-resize) are drawn by the toolkit
  (platform/cursor_shapes.odin: shapes on a 32-unit grid, signed distances sampled 4 x 4 per pixel, cursor_draw) at
  the size of the system's cursors on the window's monitor (SM_CXCURSOR at its dpi, cursor_size_px), in the colours
  of the user's scheme (white or black pointer, read from the system's arrow: cursor_scheme), with the hotspot where
  Windows puts it (an arrow's tip, a hand's palm, a magnifier's lens); made once per size and scheme, again when the
  dpi or the cursor settings change (WM_SETTINGCHANGE SPI_SETCURSORS), destroyed with the window. None hides the
  pointer over the client area.
• Custom cursors from an image: custom_cursor_create(w, rgba, size, hotspot, density, key, max_css) (hotspot
  clamped into the image; larger than CUSTOM_CURSOR_MAX_CSS = 128 CSS pixels, Chromium's limit: .Too_Large, the
  caller shows its fallback), shared by key with counted references, custom_cursor_release,
  set_cursor_custom(w, cc, fallback, scale) (the image resized to its CSS size times the scale, cursor_resample:
  premultiplied, a tent filter as wide as the reduction; at most four sizes kept per image), custom_cursor_valid,
  custom_cursor_stats, custom_cursor_info.
• destroy_window: destroys the window and what it holds (its cursors, events, title bar regions).
• cursor_info, cursor_handle_of, shown_cursor, cursor_render (a cursor as the system draws it, for previews and
  tests).
• examples/cursors: every cursor in a grid (light and dark tiles, its CSS name, system or drawn), hover a cell to get
  it; the last cell has a custom cursor. --preview N draws the previews at N pixels.
• tests/cursors: CSS names, system or drawn for each value, the drawn shapes at several sizes and both schemes
  (colours, bounds, hotspots), resampling, and on a hidden window every cursor made at the system's size, custom
  cursors' references, sizes, hotspots, limits and release.

Changed

• The cursor is shown at once when set_cursor / set_cursor_custom changes it while the pointer is over the
  client area or captured by the window (a drag: no WM_SETCURSOR comes during a capture; a page scrolled or changed
  under a pointer that does not move), and WM_SETCURSOR over the client area sets the one resolved last (no frame
  needed while the pointer moves over the same thing). The system keeps its own over the frame, the resize bands and
  the caption of an integrated title bar.
• Native_Window.cursors is no longer an array of handles (the cursor state of cursors_win32.odin).