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#include <lua.h>
#include <lauxlib.h>
/* nanovg provides its own stb_image implementation */
/*#define STB_IMAGE_IMPLEMENTATION*/
#include "stb_image.h"
#include "util/util.h"
#include "image.h"
int empty(lua_State *L);
int load_image(lua_State *L);
int free_image(lua_State *L);
void setup_image(lua_State *L, int honey_index)
{
struct honey_tbl_t image[] = {
/* basic images */
H_FUNC("null", empty),
H_FUNC("load", load_image),
H_FUNC("destroy", free_image),
H_END
};
create_table(L, image);
lua_setfield(L, honey_index, "image");
}
/* --===== basic images =====-- */
int empty(lua_State *L)
{
lua_pushlightuserdata(L, NULL);
return 1;
}
int load_image(lua_State *L)
{
const char *filename = luaL_checkstring(L, 1);
int requested_channels = luaL_checkinteger(L, 2);
int width, height, channels;
unsigned char *data = stbi_load(filename, &width, &height, &channels, requested_channels);
if (data == NULL) {
return luaL_error(L, "failed to load image '%s'", filename);
}
lua_pushlightuserdata(L, data);
lua_pushinteger(L, width);
lua_pushinteger(L, height);
lua_pushinteger(L, channels);
return 4;
}
int free_image(lua_State *L)
{
void *data = lua_touserdata(L, 1);
if (data == NULL) {
return luaL_typerror(L, 1, "userdata");
}
stbi_image_free(data);
return 0;
}
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