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move color_to_rgba to LuaAPI for consistency

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This commit is contained in:
Robin Gareus 2017-02-18 16:11:18 +01:00
parent c40ccd5aae
commit 4755c703f4
3 changed files with 43 additions and 0 deletions
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16
libs/ardour/ardour/lua_api.h
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@ -166,6 +166,22 @@ namespace ARDOUR { namespace LuaAPI {
*/
int hsla_to_rgba (lua_State *lua);
/**
* A convenience function to expand RGBA parameters from an integer
*
* convert a Canvas::Color (uint32_t 0xRRGGBBAA) into
* double RGBA values which can be passed as parameters to
* Cairo::Context::set_source_rgba
*
* Example:
* @code
* local r, g, b, a = ARDOUR.LuaAPI.color_to_rgba (0x88aa44ff)
* cairo_ctx:set_source_rgba (ARDOUR.LuaAPI.color_to_rgba (0x11336699)
* @endcode
* @returns 4 parameters: red, green, blue, alpha (in range 0..1)
*/
int color_to_rgba (lua_State *lua);
/**
* Creates a filename from a series of elements using the correct separator for filenames.
*

26
libs/ardour/lua_api.cc
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@ -502,6 +502,32 @@ ARDOUR::LuaAPI::hsla_to_rgba (lua_State *L)
return 4;
}
int
ARDOUR::LuaAPI::color_to_rgba (lua_State *L)
{
int top = lua_gettop (L);
if (top < 1) {
return luaL_argerror (L, 1, "invalid number of arguments, color_to_rgba (uint32_t)");
}
uint32_t color = luabridge::Stack<uint32_t>::get (L, 1);
double r, g, b, a;
/* libardour is no user of libcanvas, otherwise
* we could just call
* ArdourCanvas::color_to_rgba (color, r, g, b, a);
*/
r = ((color >> 24) & 0xff) / 255.0;
g = ((color >> 16) & 0xff) / 255.0;
b = ((color >> 8) & 0xff) / 255.0;
a = ((color >> 0) & 0xff) / 255.0;
luabridge::Stack <double>::push (L, r);
luabridge::Stack <double>::push (L, g);
luabridge::Stack <double>::push (L, b);
luabridge::Stack <double>::push (L, a);
return 4;
}
int
ARDOUR::LuaAPI::build_filename (lua_State *L)
{

1
libs/ardour/luabindings.cc
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@ -1930,6 +1930,7 @@ LuaBindings::common (lua_State* L)
.addRefFunction ("get_plugin_insert_param", ARDOUR::LuaAPI::get_plugin_insert_param)
.addCFunction ("plugin_automation", ARDOUR::LuaAPI::plugin_automation)
.addCFunction ("hsla_to_rgba", ARDOUR::LuaAPI::hsla_to_rgba)
.addCFunction ("color_to_rgba", ARDOUR::LuaAPI::color_to_rgba)
.addFunction ("usleep", Glib::usleep)
.addCFunction ("build_filename", ARDOUR::LuaAPI::build_filename)
.addFunction ("new_noteptr", ARDOUR::LuaAPI::new_noteptr)