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Add multiply texture modifier

Allows colorizing of textures using a color multiplication method.
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sapier authored and paramat committed Jan 14, 2017
1 parent 6642c85 commit e761b9f48626db2af8b62a0cf85691208951cf0d
Showing with 58 additions and 2 deletions.
  1. +7 −0 doc/lua_api.txt
  2. +51 −2 src/client/tile.cpp
@@ -419,6 +419,13 @@ the word "`alpha`", then each texture pixel will contain the RGB of
`<color>` and the alpha of `<color>` multiplied by the alpha of the
texture pixel.

#### `[multiply:<color>`
Multiplies texture colors with the given color.
`<color>` is specified as a `ColorString`.
Result is more like what you'd expect if you put a color on top of another
color. Meaning white surfaces get a lot of your new color while black parts don't
change very much.

Sounds
------
Only Ogg Vorbis files are supported.
@@ -555,7 +555,11 @@ static void blit_with_alpha_overlay(video::IImage *src, video::IImage *dst,
// color alpha with the destination alpha.
// Otherwise, any pixels that are not fully transparent get the color alpha.
static void apply_colorize(video::IImage *dst, v2u32 dst_pos, v2u32 size,
video::SColor color, int ratio, bool keep_alpha);
const video::SColor &color, int ratio, bool keep_alpha);

// paint a texture using the given color
static void apply_multiplication(video::IImage *dst, v2u32 dst_pos, v2u32 size,
const video::SColor &color);

// Apply a mask to an image
static void apply_mask(video::IImage *mask, video::IImage *dst,
@@ -1656,6 +1660,30 @@ bool TextureSource::generateImagePart(std::string part_of_name,
<< filename << "\".";
}
}
/*
[multiply:color
multiplys a given color to any pixel of an image
color = color as ColorString
*/
else if (str_starts_with(part_of_name, "[multiply:")) {
Strfnd sf(part_of_name);
sf.next(":");
std::string color_str = sf.next(":");

if (baseimg == NULL) {
errorstream << "generateImagePart(): baseimg != NULL "
<< "for part_of_name=\"" << part_of_name
<< "\", cancelling." << std::endl;
return false;
}

video::SColor color;

if (!parseColorString(color_str, color, false))
return false;

apply_multiplication(baseimg, v2u32(0, 0), baseimg->getDimension(), color);
}
/*
[colorize:color
Overlays image with given color
@@ -1960,7 +1988,7 @@ static void blit_with_interpolate_overlay(video::IImage *src, video::IImage *dst
Apply color to destination
*/
static void apply_colorize(video::IImage *dst, v2u32 dst_pos, v2u32 size,
video::SColor color, int ratio, bool keep_alpha)
const video::SColor &color, int ratio, bool keep_alpha)
{
u32 alpha = color.getAlpha();
video::SColor dst_c;
@@ -1994,6 +2022,27 @@ static void apply_colorize(video::IImage *dst, v2u32 dst_pos, v2u32 size,
}
}

/*
Apply color to destination
*/
static void apply_multiplication(video::IImage *dst, v2u32 dst_pos, v2u32 size,
const video::SColor &color)
{
video::SColor dst_c;

for (u32 y = dst_pos.Y; y < dst_pos.Y + size.Y; y++)
for (u32 x = dst_pos.X; x < dst_pos.X + size.X; x++) {
dst_c = dst->getPixel(x, y);
dst_c.set(
dst_c.getAlpha(),
(dst_c.getRed() * color.getRed()) / 255,
(dst_c.getGreen() * color.getGreen()) / 255,
(dst_c.getBlue() * color.getBlue()) / 255
);
dst->setPixel(x, y, dst_c);
}
}

/*
Apply mask to destination
*/

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