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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>
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hecks 2021-07-29 05:10:10 +02:00 • committed by GitHub
parent 2866918f32
commit 80d12dbedb
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19
doc/lua_api.txt
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@ -4611,6 +4611,23 @@ Utilities
* `minetest.colorspec_to_colorstring(colorspec)`: Converts a ColorSpec to a
ColorString. If the ColorSpec is invalid, returns `nil`.
* `colorspec`: The ColorSpec to convert
* `minetest.colorspec_to_bytes(colorspec)`: Converts a ColorSpec to a raw
string of four bytes in an RGBA layout, returned as a string.
* `colorspec`: The ColorSpec to convert
* `minetest.encode_png(width, height, data, [compression])`: Encode a PNG
image and return it in string form.
* `width`: Width of the image
* `height`: Height of the image
* `data`: Image data, one of:
* array table of ColorSpec, length must be width*height
* string with raw RGBA pixels, length must be width*height*4
* `compression`: Optional zlib compression level, number in range 0 to 9.
The data is one-dimensional, starting in the upper left corner of the image
and laid out in scanlines going from left to right, then top to bottom.
Please note that it's not safe to use string.char to generate raw data,
use `colorspec_to_bytes` to generate raw RGBA values in a predictable way.
The resulting PNG image is always 32-bit. Palettes are not supported at the moment.
You may use this to procedurally generate textures during server init.
Logging
-------
@ -7631,7 +7648,7 @@ Used by `minetest.register_node`.
leveled_max = 127,
-- Maximum value for `leveled` (0-127), enforced in
-- `minetest.set_node_level` and `minetest.add_node_level`.
-- Values above 124 might causes collision detection issues.
-- Values above 124 might causes collision detection issues.
liquid_range = 8,
-- Maximum distance that flowing liquid nodes can spread around