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Roblox backend: clear/upload only each tile's dirty region; scroll benchmark in t_drag, scrolling in t_composite

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4DBug
2026-10-08 11:33:28 -05:00
parent ceb66d3067
commit ab108d288b
6 changed files with 75 additions and 11 deletions
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build/ImGui.luau
+30 -3
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@@ -33680,7 +33680,7 @@ local function GetTile(bd, layer, key, tx, ty)
label.Visible = false
label.Active = bd.TilesActive
label.Parent = layer.Frame
tile = { Image = img, Label = label, Buffer = buffer.create(TILE * TILE * 4), H1 = -1, H2 = -1, Visible = false }
tile = { Image = img, Label = label, Buffer = buffer.create(TILE * TILE * 4), H1 = -1, H2 = -1, Visible = false, BX0 = TILE, BY0 = TILE, BX1 = 0, BY1 = 0 }
layer.Tiles[key] = tile
return tile
end
@@ -33879,8 +33879,28 @@ function ImGui_ImplRoblox_RenderDrawData(draw_data)
local x0, y0 = lx0 + tx * TILE, ly0 + ty * TILE
local x1, y1 = x0 + TILE, y0 + TILE
buf, buf_w = tile.Buffer, TILE
buffer.fill(buf, 0, 0)
local list = tl[key]
-- Dirty region = old content bounds + new content bounds. Outside it the tile is already
-- transparent, so only this region is cleared and uploaded (edge tiles are often mostly empty).
local nx0, ny0, nx1, ny1 = TILE, TILE, 0, 0
for k = 1, count do
local p = list[k]
local a, b = pr_bx0[p] - x0, pr_by0[p] - y0
local c, d = pr_bx1[p] - x0, pr_by1[p] - y0
if a < nx0 then nx0 = a end
if b < ny0 then ny0 = b end
if c > nx1 then nx1 = c end
if d > ny1 then ny1 = d end
end
nx0, ny0, nx1, ny1 = max(nx0, 0), max(ny0, 0), min(nx1, TILE), min(ny1, TILE)
local rx0, ry0, rx1, ry1 = min(nx0, tile.BX0), min(ny0, tile.BY0), max(nx1, tile.BX1), max(ny1, tile.BY1)
tile.BX0, tile.BY0, tile.BX1, tile.BY1 = nx0, ny0, nx1, ny1
local rw = rx1 - rx0
if rw == TILE then
buffer.fill(buf, ry0 * TILE * 4, 0, (ry1 - ry0) * TILE * 4)
else
for y = ry0, ry1 - 1 do buffer.fill(buf, (y * TILE + rx0) * 4, 0, rw * 4) end
end
local tox, toy = ox + x0, oy + y0
for k = 1, count do
local p = list[k]
@@ -33902,7 +33922,14 @@ function ImGui_ImplRoblox_RenderDrawData(draw_data)
end
end
PB("ImGui upload")
tile.Image:WritePixelsBuffer(Vector2.zero, TILE_SIZE, buf)
if rw == TILE and ry0 == 0 and ry1 == TILE then
tile.Image:WritePixelsBuffer(Vector2.zero, TILE_SIZE, buf)
elseif rw > 0 and ry1 > ry0 then
local rh = ry1 - ry0
local sub = buffer.create(rw * rh * 4)
for y = 0, rh - 1 do buffer.copy(sub, y * rw * 4, buf, ((ry0 + y) * TILE + rx0) * 4, rw * 4) end
tile.Image:WritePixelsBuffer(Vector2.new(rx0, ry0), Vector2.new(rw, rh), sub)
end
PE()
end
if not tile.Visible then