Martino Ferrari
ffc060d6ca
The text pipeline stages a glyph's rect *origin* per instance and carries the rect's *size* once per draw, so a backend whose glyphs have differing rect sizes -- a TrueType packing trimmed to ink, which is Task 8's shape -- would have drawn every glyph at whichever size it happened to be told, with nothing downstream able to tell. Make that constraint structural rather than documented: - TextBackend::cell_uv() declares the one cell size, and the contract (an atlas is a fixed-cell grid; a proportional face draws its glyphs *into* a uniform cell instead of trimming each rect to its ink, and why the pipeline needs it) is stated on the atlas accessors. - glyph_is_cell() is the check; add_text()/set_cell() declare the cell from the backend, and the staging path asserts it for every glyph in a debug build. A release build draws on with the cell it was told, as before. - Renderer::flush_text() takes u_glyph_uv from the backend, not from the batch, so the draw's one rect size can never come from whichever glyph was staged first.