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Added 'recolor_image' function

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git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@1473 0fc631ac-6414-0410-93d0-97cfa31319b6
This commit is contained in:
twanvl
2010-08-03 18:19:05 +00:00
parent ca0e762b64
commit e01b24aa63
13 changed files with 185 additions and 29 deletions
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src/gfx/image_effects.cpp
+40
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@@ -70,3 +70,43 @@ void invert(Image& img) {
data[i] = 255 - data[i];
}
}
// ----------------------------------------------------------------------------- : Coloring symbol images
RGB recolor(RGB x, RGB cr, RGB cg, RGB cb, RGB cw) {
int lo = min(x.r,min(x.g,x.b));
// amount of each
int nr = x.r - lo;
int ng = x.g - lo;
int nb = x.b - lo;
int nw = lo;
// We should have that nr+ng+bw+nw < 255,
// otherwise the input is not a mixture of red/green/blue/white.
// Just to be sure, divide by the sum instead of 255
int total = max(255, nr+ng+nb+nw);
return RGB(
static_cast<Byte>( (nr * cr.r + ng * cg.r + nb * cb.r + nw * cw.r) / total ),
static_cast<Byte>( (nr * cr.g + ng * cg.g + nb * cb.g + nw * cw.g) / total ),
static_cast<Byte>( (nr * cr.b + ng * cg.b + nb * cb.b + nw * cw.b) / total )
);
}
void recolor(Image& img, RGB cr, RGB cg, RGB cb, RGB cw) {
RGB* data = (RGB*)img.GetData();
int n = img.GetWidth() * img.GetHeight();
for (int i = 0 ; i < n ; ++i) {
data[i] = recolor(data[i], cr, cg, cb, cw);
}
}
Byte to_grayscale(RGB x) {
return (Byte)((6969 * x.r + 23434 * x.g + 2365 * x.b) / 32768); // from libpng
}
void recolor(Image& img, RGB cr) {
RGB black(0,0,0), white(255,255,255);
bool dark = to_grayscale(cr) < 100;
recolor(img, cr, dark ? black : white, dark ? white : black, white);
}