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Optimize and improve built-in PNG writer (#14020)

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sfan5 2023-12-27 11:56:48 +01:00 • committed by GitHub
parent 5054918efc
commit 93dfa8a6d8
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4 changed files with 120 additions and 26 deletions
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30
games/devtest/mods/testnodes/textures.lua
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@ -105,6 +105,19 @@ local function gen_checkers(w, h, tile)
return r
end
-- The engine should perform color reduction of the generated PNG in certain
-- cases, so we have this helper to check the result
local function encode_and_check(w, h, ctype, data)
local ret = core.encode_png(w, h, data)
assert(ret:sub(1, 8) == "\137PNG\r\n\026\n", "missing png signature")
assert(ret:sub(9, 16) == "\000\000\000\rIHDR", "didn't find ihdr chunk")
local ctype_actual = ret:byte(26) -- Color Type (1 byte)
ctype = ({rgba=6, rgb=2, gray=0})[ctype]
assert(ctype_actual == ctype, "png should have color type " .. ctype ..
" but actually has " .. ctype_actual)
return ret
end
local fractal = mandelbrot(512, 512, 128)
local frac_emb = mandelbrot(64, 64, 64)
local checker = gen_checkers(512, 512, 32)
@ -129,17 +142,21 @@ for i=1, #fractal do
b = floor(abs(1 - fractal[i]) * 255),
a = 255,
}
data_ck[i] = checker[i] > 0 and "#F80" or "#000"
data_ck[i] = checker[i] > 0 and "#888" or "#000"
end
fractal = nil
frac_emb = nil
checker = nil
local textures_path = minetest.get_modpath( minetest.get_current_modname() ) .. "/textures/"
minetest.safe_file_write(
textures_path .. "testnodes_generated_mb.png",
minetest.encode_png(512,512,data_mb)
encode_and_check(512, 512, "rgb", data_mb)
)
minetest.safe_file_write(
textures_path .. "testnodes_generated_ck.png",
minetest.encode_png(512,512,data_ck)
encode_and_check(512, 512, "gray", data_ck)
)
minetest.register_node("testnodes:generated_png_mb", {
@ -155,7 +172,8 @@ minetest.register_node("testnodes:generated_png_ck", {
groups = { dig_immediate = 2 },
})
local png_emb = "[png:" .. minetest.encode_base64(minetest.encode_png(64,64,data_emb))
local png_emb = "[png:" .. minetest.encode_base64(
encode_and_check(64, 64, "rgba", data_emb))
minetest.register_node("testnodes:generated_png_emb", {
description = S("Generated In-Band Mandelbrot PNG Test Node"),
@ -182,6 +200,10 @@ minetest.register_node("testnodes:generated_png_dst_emb", {
groups = { dig_immediate = 2 },
})
data_emb = nil
data_mb = nil
data_ck = nil
--[[
The following nodes can be used to demonstrate the TGA format support.