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Add a simple PNG image encoder with Lua API (#11485)

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* Add a simple PNG image encoder with Lua API
Add ColorSpec to RGBA converter
Make a safety wrapper for the encoder
Create devtest examples

Co-authored-by: hecktest <>
Co-authored-by: sfan5 <sfan5@live.de>
This commit is contained in:
hecks 2021-07-29 05:10:10 +02:00 • committed by GitHub
parent 2866918f32
commit 80d12dbedb
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9 changed files with 278 additions and 1 deletions
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39
builtin/game/misc.lua
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@ -290,3 +290,42 @@ function core.dynamic_add_media(filepath, callback)
end
return true
end
-- PNG encoder safety wrapper
local o_encode_png = core.encode_png
function core.encode_png(width, height, data, compression)
if type(width) ~= "number" then
error("Incorrect type for 'width', expected number, got " .. type(width))
end
if type(height) ~= "number" then
error("Incorrect type for 'height', expected number, got " .. type(height))
end
local expected_byte_count = width * height * 4;
if type(data) ~= "table" and type(data) ~= "string" then
error("Incorrect type for 'height', expected table or string, got " .. type(height));
end
local data_length = type(data) == "table" and #data * 4 or string.len(data);
if data_length ~= expected_byte_count then
error(string.format(
"Incorrect length of 'data', width and height imply %d bytes but %d were provided",
expected_byte_count,
data_length
))
end
if type(data) == "table" then
local dataBuf = {}
for i = 1, #data do
dataBuf[i] = core.colorspec_to_bytes(data[i])
end
data = table.concat(dataBuf)
end
return o_encode_png(width, height, data, compression or 6)
end