BuckarooBanzay/isogen-cd2025
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optimize add_pixel

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This commit is contained in:
BuckarooBanzay 2024-05-23 10:00:20 +02:00
parent 8d0616b01e
commit 66d4c5f103
2 changed files with 8 additions and 3 deletions
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9
canvas.lua
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@ -8,8 +8,12 @@ function Canvas:get_index(x, y)
return (self.width * y) + x + 1
end
-- add pixel with transparency
function Canvas:add_pixel(x, y, fg)
fg.a = fg.a or 255
if not fg.a or fg.a == 255 then
-- solid color, no transparency
return self:set_pixel(x, y, fg)
end
local i = self:get_index(x, y)
local bg = self.png_data[i]
@ -20,10 +24,11 @@ function Canvas:add_pixel(x, y, fg)
r = ((fg.r * a) + (bg.r * ai)),
g = ((fg.g * a) + (bg.g * ai)),
b = ((fg.b * a) + (bg.b * ai)),
a = math.max(bg.a, fg.a)
a = math.max(bg.a or 255, fg.a)
}
end
-- set a pixel
function Canvas:set_pixel(x, y, colorspec)
local i = self:get_index(x, y)
self.png_data[i] = colorspec

2
draw_map.spec.lua
View File

@ -9,7 +9,7 @@ mtt.register("draw_map", function(callback)
minetest.set_node(pos1, { name = "mapgen_stone" })
minetest.set_node(vector.add(pos1, vector.new(1, 0, 0)), { name = "mapgen_stone" })
minetest.set_node(vector.add(pos1, vector.new(2, 0, 0)), { name = "mapgen_stone" })
minetest.set_node(vector.add(pos1, vector.new(0, 0, 1)), { name = "mapgen_water_source" })
minetest.set_node(vector.add(pos1, vector.new(0, 1, 0)), { name = "mapgen_water_source" })
minetest.set_node(vector.add(pos1, vector.new(1, 0, 1)), { name = "mapgen_water_source" })
-- sanity tests