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encode_png: Support different data formats

master
Lars Mueller 2021-10-21 16:16:22 +02:00
parent 084d5e90c0
commit ca146ff265
1 changed files with 6 additions and 10 deletions
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16
minetest/encode_png.lua
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@ -90,20 +90,16 @@ local function encode_png(width, height, data, compression, raw_write)
byte(0)
end_chunk()
chunk"IDAT"
local data_bytestring = {}
local data_rope = {}
for y = 0, height - 1 do
local base = y * width
insert(data_bytestring, "\0")
local base_index = y * width
insert(data_rope, "\0")
for x = 1, width do
local color_int = data[base + x]
local a = floor(color_int / 0x1000000) % 0x100
local r = floor(color_int / 0x10000) % 0x100
local g = floor(color_int / 0x100) % 0x100
local b = color_int % 0x100
insert(data_bytestring, char(r, g, b, a))
local colorspec = modlib.minetest.colorspec.from_any(data[base_index + x])
insert(data_rope, char(colorspec.r, colorspec.g, colorspec.b, colorspec.a))
end
end
write(minetest.compress(concat(data_bytestring), "deflate", compression))
write(minetest.compress(type(data) == "string" and data or concat(data_rope), "deflate", compression))
end_chunk()
chunk"IEND"
end_chunk()