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Add an [opacity:<r> texture modifier. Makes the base image transparent according to the given ratio. r must be between 0 and 255. 0 means totally transparent. 255 means totally opaque. Useful for texture overlaying.

master
Thomas--S 2016-07-02 17:58:08 +02:00 committed by Loic Blot
parent c4e77b406a
commit f21dae6339
2 changed files with 40 additions and 0 deletions
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10
doc/lua_api.txt
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@ -292,6 +292,16 @@ Example:
default_sandstone.png^[resize:16x16
#### `[opacity:<r>`
Makes the base image transparent according to the given ratio.
r must be between 0 and 255.
0 means totally transparent.
255 means totally opaque.
Example:
default_sandstone.png^[opacity:127
#### `[brighten`
Brightens the texture.

30
src/client/tile.cpp
View File

@ -1735,6 +1735,36 @@ bool TextureSource::generateImagePart(std::string part_of_name,
baseimg->drop();
baseimg = image;
}
/*
[opacity:R
Makes the base image transparent according to the given ratio.
R must be between 0 and 255.
0 means totally transparent.
255 means totally opaque.
*/
else if (str_starts_with(part_of_name, "[opacity:")) {
if (baseimg == NULL) {
errorstream << "generateImagePart(): baseimg == NULL "
<< "for part_of_name=\"" << part_of_name
<< "\", cancelling." << std::endl;
return false;
}
Strfnd sf(part_of_name);
sf.next(":");
u32 ratio = mystoi(sf.next(""), 0, 255);
core::dimension2d<u32> dim = baseimg->getDimension();
for (u32 y = 0; y < dim.Height; y++)
for (u32 x = 0; x < dim.Width; x++)
{
video::SColor c = baseimg->getPixel(x,y);
c.setAlpha(floor((c.getAlpha() * ratio) / 255 + 0.5));
baseimg->setPixel(x,y,c);
}
}
else
{
errorstream << "generateImagePart(): Invalid "