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Add support for 9-sliced backgrounds (#8600)

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9-slice textures are commonly used in GUIs to allow scaling them to match any resolution without distortion.

https://en.wikipedia.org/wiki/9-slice_scaling
This commit is contained in:
rubenwardy
2019-06-22 15:03:54 +01:00
committed by SmallJoker
parent 4e3c1916f7
commit 429a989648
5 changed files with 137 additions and 13 deletions
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17
doc/lua_api.txt
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@@ -2034,13 +2034,26 @@ Elements
### `background[<X>,<Y>;<W>,<H>;<texture name>]`
* Use a background. Inventory rectangles are not drawn then.
* Example for formspec 8x4 in 16x resolution: image shall be sized
8 times 16px times 4 times 16px.
### `background[<X>,<Y>;<W>,<H>;<texture name>;<auto_clip>]`
* Use a background. Inventory rectangles are not drawn then.
* Example for formspec 8x4 in 16x resolution:
image shall be sized 8 times 16px times 4 times 16px
* If `auto_clip` is `true`, the background is clipped to the formspec size
(`x` and `y` are used as offset values, `w` and `h` are ignored)
### `background[<X>,<Y>;<W>,<H>;<texture name>;<auto_clip>;<middle>]`
* 9-sliced background. See https://en.wikipedia.org/wiki/9-slice_scaling
* Middle is a rect which defines the middle of the 9-slice.
* `x` - The middle will be x pixels from all sides.
* `x,y` - The middle will be x pixels from the horizontal and y from the vertical.
* `x,y,x2,y2` - The middle will start at x,y, and end at x2, y2. Negative x2 and y2 values
will be added to the width and height of the texture, allowing it to be used as the
distance from the far end.
* All numbers in middle are integers.
* Example for formspec 8x4 in 16x resolution:
image shall be sized 8 times 16px times 4 times 16px
* If `auto_clip` is `true`, the background is clipped to the formspec size