What 1.12 withholds here is a framework, not a verb. Its world map is a fixed
1002x668 frame showing one zone — twelve tiles, a hit button, POI buttons, two
dropdowns — with no canvas, no pan, no zoom, no pins and no notion of where one
map sits on another. Every map addon written after 4.0 drives the canvas
framework instead, and there is no stock file to migrate from because there is
no stock feature.
The constraint that shaped every decision: `WorldMapFrame` already has eight
1.12 consumers on this install, all anchoring icons to `WorldMapDetailFrame`
and `WorldMapButton`. So nothing is replaced. The canvas is added, and those
two frames are reparented INTO it — at rest the rect they had, at scale 1 with
no pan, so the stock window is pixel-identical, and the payoff is that the 1.12
art and every icon on it now pan and scale WITH the canvas for free.
Clipping comes from a real ScrollFrame: this client clips a scroll child and
every descendant of it from one source, in the draw pass and the hit-test, so
drawing and hitting agree. The base-art layer a canvas addon hides is a proxy
that switches draw layers rather than the frame, because hiding the frame would
take the POI buttons and every addon's icons with it.
Three regressions, each found by measurement, each pinned: the anchor cycle
(container to detail frame to canvas to container — a cycle resolves to
nothing, and the symptom was `GetCenter()` nil inside the stock hover pass); the
base scale (a minScale below 1 opens the map zoomed out of its own window); and
`dataProviders` being a set rather than an array, because callers iterate it
with `pairs` and bind the key — an array handed that loop the number 1.
`CreateLine` is a Texture carrying two endpoints, drawn through the
explicit-corner quad path the cooldown wedge already uses. Nothing stands in
for it: a line between two moving points is a rotated quad whose angle and
length both change. `C_Texture.GetAtlasInfo` answers nil for every name, and
the nil is the answer — but the getter's presence is what makes the common
atlas guard take its fallback branch instead of raising.
The harness grew a second surface, and the finding is worth keeping: the full
screen map hides `UIParent`, so opening it in the ordinary render probe dropped
the corpus's draw column from 37/86 to 18/86 — nineteen unrelated addons. As
its own pass: no addon lost a quad and nineteen gained, pfQuest 374 -> 911,
pfUI 1063 -> 2259.
OpenMapClassic now reads 1/1 on all five columns, stitching 74 of the realm's
own zones. Corpus roster unchanged at 85 ok / 1 fail; the 12 data-half reds
byte-identical to HEAD's.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SgstFWtn1RxEJ5kVrpgYwn
gromandClaude Opus 5
75ba592fba