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Add ^[mask texture modifier

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sfan5 committed Jul 25, 2014
1 parent e4d570e commit b19dd922ec69f0dab4ee087f852e0b7fbc6ffaa6
Showing with 53 additions and 0 deletions.
  1. +4 −0 doc/lua_api.txt
  2. +49 −0 src/tile.cpp
@@ -258,6 +258,10 @@ Advanced texture modifiers:
Crops the texture to a frame of a vertical animation.
Example: default_torch_animated.png^[verticalframe:16:8

[mask:<file>
Apply a mask to the base image.
The mask is applied using binary AND.

Sounds
-------
Only OGG Vorbis files are supported.
@@ -537,6 +537,10 @@ static void blit_with_alpha(video::IImage *src, video::IImage *dst,
static void blit_with_alpha_overlay(video::IImage *src, video::IImage *dst,
v2s32 src_pos, v2s32 dst_pos, v2u32 size);

// Apply a mask to an image
static void apply_mask(video::IImage *mask, video::IImage *dst,
v2s32 mask_pos, v2s32 dst_pos, v2u32 size);

// Draw or overlay a crack
static void draw_crack(video::IImage *crack, video::IImage *dst,
bool use_overlay, s32 frame_count, s32 progression,
@@ -1557,6 +1561,31 @@ bool TextureSource::generateImagePart(std::string part_of_name,
baseimg->drop();
baseimg = img;
}
/*
[mask:filename
Applies a mask to an image
*/
else if(part_of_name.substr(0,6) == "[mask:")
{
if (baseimg == NULL) {
errorstream << "generateImage(): baseimg == NULL "
<< "for part_of_name=\"" << part_of_name
<< "\", cancelling." << std::endl;
return false;
}
Strfnd sf(part_of_name);
sf.next(":");
std::string filename = sf.next(":");

video::IImage *img = m_sourcecache.getOrLoad(filename, m_device);
if (img) {
apply_mask(img, baseimg, v2s32(0, 0), v2s32(0, 0),
img->getDimension());
} else {
errorstream << "generateImage(): Failed to load \""
<< filename << "\".";
}
}
else
{
errorstream<<"generateImagePart(): Invalid "
@@ -1615,6 +1644,26 @@ static void blit_with_alpha_overlay(video::IImage *src, video::IImage *dst,
}
}

/*
Apply mask to destination
*/
static void apply_mask(video::IImage *mask, video::IImage *dst,
v2s32 mask_pos, v2s32 dst_pos, v2u32 size)
{
for(u32 y0 = 0; y0 < size.Y; y0++) {
for(u32 x0 = 0; x0 < size.X; x0++) {
s32 mask_x = x0 + mask_pos.X;
s32 mask_y = y0 + mask_pos.Y;
s32 dst_x = x0 + dst_pos.X;
s32 dst_y = y0 + dst_pos.Y;
video::SColor mask_c = mask->getPixel(mask_x, mask_y);
video::SColor dst_c = dst->getPixel(dst_x, dst_y);
dst_c.color &= mask_c.color;
dst->setPixel(dst_x, dst_y, dst_c);
}
}
}

static void draw_crack(video::IImage *crack, video::IImage *dst,
bool use_overlay, s32 frame_count, s32 progression,
video::IVideoDriver *driver)

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