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Lua: matchcolor2() now takes an optional argument that is the weight of lightness in color proximity algorithm (instead of the 0.25 default).

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git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1821 416bcca6-2ee7-4201-b75f-2eb2f807beb1
This commit is contained in:
Yves Rizoud
2011-07-18 23:08:33 +00:00
parent f2316f12e2
commit 8ba389e06b
3 changed files with 58 additions and 3 deletions
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17
src/factory.c
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@@ -711,12 +711,23 @@ int L_MatchColor2(lua_State* L)
int c;
int nb_args=lua_gettop(L);
LUA_ARG_LIMIT (3, "matchcolor2");
if (nb_args < 3 || nb_args > 4)
{
return luaL_error(L, "matchcolor2: Expected 3 or 4 arguments, but found %d.", nb_args);
}
LUA_ARG_NUMBER(1, "matchcolor2", r, -DBL_MAX, DBL_MAX);
LUA_ARG_NUMBER(2, "matchcolor2", g, -DBL_MAX, DBL_MAX);
LUA_ARG_NUMBER(3, "matchcolor2", b, -DBL_MAX, DBL_MAX);
c = Best_color_perceptual(clamp_byte(r),clamp_byte(g),clamp_byte(b));
if (nb_args == 3)
{
c = Best_color_perceptual(clamp_byte(r),clamp_byte(g),clamp_byte(b));
}
else // nb_args == 4
{
float weight;
LUA_ARG_NUMBER(4, "matchcolor2", weight, -DBL_MAX, DBL_MAX);
c = Best_color_perceptual_weighted(clamp_byte(r),clamp_byte(g),clamp_byte(b),weight);
}
lua_pushinteger(L, c);
return 1;
}