limlib2.c

/* Wraps the Imlib2 library */
#include <string.h>
#include "lua.h"
#include "lauxlib.h"

#define X_DISPLAY_MISSING
#include "Imlib2.h"

typedef Imlib_Image Image;
typedef Imlib_Color_Modifier ColorModifier;
typedef Imlib_Color_Range Gradient;
typedef ImlibPolygon Polygon;
typedef Imlib_Font Font;

static struct { const char *fmtstr; Imlib_Load_Error errno; } err_strings[] = {
  {"file '%s' does not exist", IMLIB_LOAD_ERROR_FILE_DOES_NOT_EXIST},
  {"file '%s' is a directory", IMLIB_LOAD_ERROR_FILE_IS_DIRECTORY},
  {"permission denied to read file '%s'", IMLIB_LOAD_ERROR_PERMISSION_DENIED_TO_READ},
  {"no loader for the file format used in file '%s'", IMLIB_LOAD_ERROR_NO_LOADER_FOR_FILE_FORMAT},
  {"path for file '%s' is too long", IMLIB_LOAD_ERROR_PATH_TOO_LONG},
  {"a component of path '%s' does not exist", IMLIB_LOAD_ERROR_PATH_COMPONENT_NON_EXISTANT},
  {"a component of path '%s' is not a directory", IMLIB_LOAD_ERROR_PATH_COMPONENT_NOT_DIRECTORY},
  {"path '%s' has too many symbolic links", IMLIB_LOAD_ERROR_TOO_MANY_SYMBOLIC_LINKS},
  {"ran out of file descriptors trying to access file '%s'", IMLIB_LOAD_ERROR_OUT_OF_FILE_DESCRIPTORS},
  {"denied write permission for file '%s'", IMLIB_LOAD_ERROR_PERMISSION_DENIED_TO_WRITE},
  {"out of disk space writing to file '%s'", IMLIB_LOAD_ERROR_OUT_OF_DISK_SPACE},
  {NULL, 0}
};

static int push_load_error_str(lua_State *L, Imlib_Load_Error err, const char *filepath) {
  int i;
  for (i = 0; err_strings[i].fmtstr != NULL; i++) {
    if (err == err_strings[i].errno) {
      lua_pushfstring(L, err_strings[i].fmtstr, filepath);
      return 1;
    }
  }
  /* Unrecognised error */
  lua_pushfstring(L, "encountered an error accessing file '%s'", filepath);
  return 1;
}

/* imlib2.color */

static Imlib_Color *push_Color(lua_State *L) {
  Imlib_Color *c = (Imlib_Color*)lua_newuserdata(L, sizeof(Imlib_Color));
  luaL_getmetatable(L, "imlib2.color");
  lua_setmetatable(L, -2);
  return c;
}

#define check_color(L,n)\
  (Imlib_Color*)luaL_checkudata(L, n, "imlib2.color")

/* color.new(red, green, blue[, alpha]) */
static int color_new(lua_State *L) {
  Imlib_Color *c;
  int i;
  int args[4];
  args[0]=luaL_checkint(L, 1); /* red */
  args[1]=luaL_checkint(L, 2); /* green */
  args[2]=luaL_checkint(L, 3); /* blue */
  args[3]=luaL_optint(L, 4, 255); /* alpha */
  for (i=0; i<4; i++)
    luaL_argcheck(L, args[i] >= 0 && args[i] <= 255, i+1, "values must be >= 0 and <= 255");
  
  c = push_Color(L);
  c->red=args[0];
  c->green=args[1];
  c->blue=args[2];
  c->alpha=args[3];
  return 1;
}

#define set_color(c)\
  imlib_context_set_color(c->red, c->green, c->blue, c->alpha)

/* col:__tostring() */
static int colorm_tostring(lua_State *L) {
  Imlib_Color *c = check_color(L,1);
  lua_pushfstring(L, "<imlib2.color r=%d g=%d b=%d a=%d> (%p)",
      c->red, c->green, c->blue, c->alpha, c);
  return 1;
}

/* read fields col.red, col.green, col.blue, col.alpha */
static int colorm__index(lua_State *L) {
  Imlib_Color *c = check_color(L, 1);
  const char *field = luaL_checkstring(L, 2);

  if (strcmp(field, "red") == 0)
    lua_pushinteger(L, c->red);
  else if (strcmp(field, "green") == 0)
    lua_pushinteger(L, c->green);
  else if (strcmp(field, "blue") == 0)
    lua_pushinteger(L, c->blue);
  else if (strcmp(field, "alpha") == 0)
    lua_pushinteger(L, c->alpha);
  else { /* look field up in metatable */
    lua_getmetatable(L, 1);
    lua_pushvalue(L, 2);
    lua_gettable(L, -2);
  }
  return 1;
}

/* set fields col.red, col.green, col.blue, col.alpha */
static int colorm__newindex(lua_State *L) {
  Imlib_Color *c = check_color(L, 1);
  const char *field = luaL_checkstring(L, 2);
  int val = luaL_checkint(L, 3);
  luaL_argcheck(L, val >= 0 && val <= 255, 3, "values must be >= 0 and <= 255");

  if (strcmp(field, "red") == 0)
    c->red = val;
  else if (strcmp(field, "green") == 0)
    c->green = val;
  else if (strcmp(field, "blue") == 0)
    c->blue = val;
  else if (strcmp(field, "alpha") == 0)
    c->alpha = val;

  return 0;
}

/* imlib2.border */

static Imlib_Border *push_Border(lua_State *L) {
  Imlib_Border *b = (Imlib_Border*)lua_newuserdata(L, sizeof(Imlib_Border));
  luaL_getmetatable(L, "imlib2.border");
  lua_setmetatable(L, -2);
  return b;
}

/* border.new(left, top, right, bottom) */
static int border_new(lua_State *L) {
  Imlib_Border *b;
  int left=luaL_checkint(L, 1);
  int top=luaL_checkint(L,2);
  int right=luaL_checkint(L,3);
  int bottom=luaL_checkint(L,4);

  b = push_Border(L);
  b->left=left;
  b->top=top;
  b->right=right;
  b->bottom=bottom;
  return 1;
}

#define check_border(L, n)\
  (Imlib_Border*)luaL_checkudata(L, n, "imlib2.border")

/* bd:__tostring() */
static int borderm_tostring(lua_State *L) {
  Imlib_Border *b = check_border(L, 1);
  lua_pushfstring(L, "<imlib2.border left=%d top=%d right=%d bottom=%d> (%p)",
      b->left, b->top, b->right, b->bottom, b);
  return 1;
}

/* read fields bd.left, bd.top, bd.right, bd.bottom */
static int borderm__index(lua_State *L) {
  Imlib_Border *b = check_border(L, 1);
  const char *field = luaL_checkstring(L, 2);

  if (strcmp(field, "left") == 0)
    lua_pushinteger(L, b->left);
  else if (strcmp(field, "top") == 0)
    lua_pushinteger(L, b->top);
  else if (strcmp(field, "right") == 0)
    lua_pushinteger(L, b->right);
  else if (strcmp(field, "bottom") == 0)
    lua_pushinteger(L, b->bottom);
  else {
    lua_getmetatable(L, 1);
    lua_pushvalue(L, 2);
    lua_gettable(L, -2);
  }
  return 1;
}

/* set fields bd.left, bd.top, bd.right, bd.bottom */
static int borderm__newindex(lua_State *L) {
  Imlib_Border *b = check_border(L, 1);
  const char *field = luaL_checkstring(L, 2);
  int val = luaL_checkint(L, 3);

  if(strcmp(field, "left") == 0)
    b->left = val;
  else if (strcmp(field, "top") == 0)
    b->top = val;
  else if (strcmp(field, "right") == 0)
    b->right = val;
  else if (strcmp(field, "bottom") == 0)
    b->bottom = val;

  return 0;
}

/* imlib2.gradient */

static Gradient push_Gradient(lua_State *L, Gradient gr) {
  Gradient *grp = (Gradient*)lua_newuserdata(L, sizeof(Gradient));
  *grp = gr;
  luaL_getmetatable(L, "imlib2.gradient");
  lua_setmetatable(L, -2);
  return gr;
}

static Gradient check_Gradient(lua_State *L, int n) {
  Gradient *grp, gr;
  grp = (Gradient*)luaL_checkudata(L, n, "imlib2.gradient");
  gr = *grp;
  if (gr == NULL)
    luaL_argerror(L, n, "gradient has been freed");
  return gr;
}

/* gradient.new() */
static int gradient_new(lua_State *L) {
  Gradient gr = push_Gradient(L, imlib_create_color_range());
  if (gr == NULL)
    return luaL_error(L, "failed with imlib_create_color_range");
  return 1;
}

static int gradientm_gc(lua_State *L) {
  Gradient *grp = (Gradient*)luaL_checkudata(L, 1, "imlib2.gradient");
  Gradient gr = *grp;
  if (gr) {
    imlib_context_set_color_range(gr);
    imlib_free_color_range();
    *grp=NULL;
  }
  return 0;
}

/* grad:__tostring() */
static int gradientm_tostring(lua_State *L) {
  Gradient *grp = (Gradient*)luaL_checkudata(L, 1, "imlib2.gradient");
  Gradient gr = *grp;
  if (gr)
    lua_pushfstring(L, "<imlib2.gradient> (%p)", gr);
  else
    lua_pushfstring(L, "<imlib2.gradient> (freed)");
  return 1;
}

/* grad:add_color(offset, color) */
static int gradientm_add_color(lua_State *L) {
  Gradient gr = check_Gradient(L, 1);
  int offset = luaL_checkint(L, 2);
  imlib_context_set_color_range(gr);
  Imlib_Color *c = check_color(L, 3);
  set_color(c);
  imlib_add_color_to_color_range(offset);
  return 0;
}

/* imlib2.polygon */

static Polygon push_Polygon(lua_State *L, Polygon po) {
  Polygon *pop = (Polygon*)lua_newuserdata(L, sizeof(Polygon));
  *pop = po;
  luaL_getmetatable(L, "imlib2.polygon");
  lua_setmetatable(L, -2);
  return po;
}

static Polygon check_Polygon(lua_State *L, int n) {
  Polygon *pop, po;
  pop = (Polygon*)luaL_checkudata(L, n, "imlib2.polygon");
  po = *pop;
  if (po == NULL)
    luaL_argerror(L, n, "polygon has been freed");
  return po;
}

/* polygon.new() */
static int polygon_new(lua_State *L) {
  Polygon po = push_Polygon(L, imlib_polygon_new());
  if (po == NULL)
    return luaL_error(L, "failed with imlib_polygon_new");
  return 1;
}

static int polygonm_gc(lua_State *L) {
  Polygon *pop = (Polygon*)luaL_checkudata(L, 1, "imlib2.polygon");
  Polygon po = *pop;
  if (po) {
    imlib_polygon_free(po);
    *pop=NULL;
  }
  return 0;
}

/* poly:__tostring() */
static int polygonm_tostring(lua_State *L) {
  Polygon po = check_Polygon(L, 1);
  if (po)
    lua_pushfstring(L, "<imlib2.polygon> (%p)", po);
  else
    lua_pushfstring(L, "<imlib2.polygon> (freed)");
  return 1;
}

/* poly:add_points(x, y) */
static int polygonm_add_point(lua_State *L) {
  Polygon po = check_Polygon(L, 1);
  int x = luaL_checkint(L, 2);
  int y = luaL_checkint(L, 3);
  imlib_polygon_add_point(po, x, y);
  return 0;
}

/* poly:get_bounds() */
static int polygonm_get_bounds(lua_State *L) {
  int i;
  Polygon po = check_Polygon(L, 1);
  int r[4] = {0, 0, 0, 0}; /* Bounding box */
  imlib_polygon_get_bounds(po, &r[0], &r[1], &r[2], &r[3]);
  for (i=0; i < 4; i++)
    lua_pushinteger(L, r[i]);
  return 4;
}

/* poly:contains_point() */
static int polygonm_contains_point(lua_State *L) {
  Polygon po = check_Polygon(L, 1);
  int x = luaL_checkint(L, 2);
  int y = luaL_checkint(L, 3);
  lua_pushboolean(L, imlib_polygon_contains_point(po, x, y));
  return 1;
}

/* imlib2.font */

static Font push_Font(lua_State *L, Font fo) {
  Font *fop = (Font*)lua_newuserdata(L, sizeof(Font));
  *fop = fo;
  luaL_getmetatable(L, "imlib2.font");
  lua_setmetatable(L, -2);
  return fo;
}

static Font check_Font(lua_State *L, int n) {
  Font *fop = luaL_checkudata(L, n, "imlib2.font");
  Font fo = *fop;
  if (fo == NULL)
    luaL_argerror(L, n, "font has been freed");
  return fo;
}

/* font.load(name) */
static int font_load(lua_State *L) {
  const char *path = luaL_checkstring(L, 1);
  Font fo = push_Font(L, imlib_load_font(path));
  if (fo == NULL) {
    lua_pushnil(L);
    lua_pushfstring(L, "cannot find font '%s'", path);
    return 2;
  }
  return 1;
}

/* font.add_path(path) */
static int font_add_path(lua_State *L) {
  const char *path = luaL_checkstring(L, 1);
  /* This is safe. Imlib2 does a strdup */
  imlib_add_path_to_font_path(path);
  return 0;
}

/* font.remove_path(path) */
static int font_remove_path(lua_State *L) {
  const char *path = luaL_checkstring(L, 1);

  imlib_remove_path_from_font_path(path);
  return 0;
}

/* font.list_paths() */
static int font_list_paths(lua_State *L) {
  char **paths;
  int i, n;

  paths = imlib_list_font_path(&n);
  lua_createtable(L, n, 0);
  for (i=0; i<n; i++) {
    lua_pushstring(L, paths[i]);
    lua_rawseti(L, -2, i+1);
  }
  /* Do not free the path list */
  return 1;
}

/* font.list_fonts() */
static int font_list_fonts(lua_State *L) {
  char **fonts;
  int i, n;

  fonts = imlib_list_fonts(&n);
  lua_createtable(L, n, 0);
  for (i=0; i<n; i++) {
    lua_pushstring(L, fonts[i]);
    lua_rawseti(L, -2, i+1);
  }
  imlib_free_font_list(fonts, n);
  return 1;
}

/* font.get_cache_size() */
static int font_get_cache_size(lua_State *L) {
  lua_pushinteger(L, imlib_get_font_cache_size());
  return 1;
}

/* font.set_cache_size() */
static int font_set_cache_size(lua_State *L) {
  int size = luaL_checkint(L, 1);

  imlib_set_font_cache_size(size);
  return 0;
}

static const char *const font_directions[] = {"right", "left", "down", "up", "angle", NULL};

/* font.set_direction(dir[, angle]) */
static int font_set_direction(lua_State *L) {
  int dir = luaL_checkoption(L, 1, NULL, font_directions);
  if (dir == IMLIB_TEXT_TO_ANGLE) {
    luaL_argcheck(L, lua_isnumber(L, 2), 2,
        "require a numeric angle for 'angle' direction");
    double angle = luaL_checknumber(L, 2);
    imlib_context_set_angle(angle);
  }

  imlib_context_set_direction(dir);
  return 0;
}

/* font.get_direction() */
static int font_get_direction(lua_State *L) {
  int dir = imlib_context_get_direction();
  if (dir == IMLIB_TEXT_TO_ANGLE) {
    lua_pushstring(L, font_directions[dir]);
    lua_pushnumber(L, imlib_context_get_angle());
    return 2;
  }
  else {
    lua_pushstring(L, font_directions[dir]);
    return 1;
  }
}

static int fontm_gc(lua_State *L) {
  Font *fop = (Font*)luaL_checkudata(L, 1, "imlib2.font");
  Font fo = *fop;
  if (fo) {
    imlib_context_set_font(fo);
    imlib_free_font();
    *fop=NULL;
  }
  return 0;
}

/* fnt:__tostring() */
static int fontm_tostring(lua_State *L) {
  Font *fop = (Font*)luaL_checkudata(L, 1, "imlib2.font");
  Font fo = *fop;
  if (fo)
    lua_pushfstring(L, "<imlib2.font> (%p)", fo);
  else
    lua_pushfstring(L, "<imlib2.font> (freed)");
  return 1;
}

/* fnt:get_size(str) */
static int fontm_get_size(lua_State *L) {
  Font fo = check_Font(L, 1);
  const char *text = luaL_checkstring(L, 2);

  int w, h;
  imlib_context_set_font(fo);
  imlib_get_text_size(text, &w, &h);
  lua_pushinteger(L, w);
  lua_pushinteger(L, h);
  return 2;
}

/* fnt:get_advance(str) */
static int fontm_get_advance(lua_State *L) {
  Font fo = check_Font(L, 1);
  const char *text = luaL_checkstring(L, 2);

  int h, v;
  imlib_context_set_font(fo);
  imlib_get_text_advance(text, &h, &v);
  lua_pushinteger(L, h);
  lua_pushinteger(L, v);
  return 2;
}

/* fnt:get_inset(str) */
static int fontm_get_inset(lua_State *L) {
  Font fo = check_Font(L, 1);
  
  imlib_context_set_font(fo);
  lua_pushinteger(L, imlib_get_text_inset(luaL_checkstring(L, 2)));
  return 1;
}


/* fnt:get_ascent() */
static int fontm_get_ascent(lua_State *L) {
  Font fo = check_Font(L, 1);

  imlib_context_set_font(fo);
  lua_pushinteger(L, imlib_get_font_ascent());
  return 1;
}

/* fnt:get_maximum_ascent() */
static int fontm_get_maximum_ascent(lua_State *L) {
  Font fo = check_Font(L, 1);

  imlib_context_set_font(fo);
  lua_pushinteger(L, imlib_get_maximum_font_ascent());
  return 1;
}

/* fnt:get_descent() */
static int fontm_get_descent(lua_State *L) {
  Font fo = check_Font(L, 1);

  imlib_context_set_font(fo);
  lua_pushinteger(L, imlib_get_font_descent());
  return 1;
}

/* fnt:get_maximum_descent() */
static int fontm_get_maximum_descent(lua_State *L) {
  Font fo = check_Font(L, 1);

  imlib_context_set_font(fo);
  lua_pushinteger(L, imlib_get_maximum_font_descent());
  return 1;
}


/* imlib2.image */

static Image push_Image(lua_State *L, Image im) {
  Image *imp = (Image*)lua_newuserdata(L, sizeof(Image));
  *imp = im;
  luaL_getmetatable(L, "imlib2.image");
  lua_setmetatable(L, -2);
  return im;
}

static Image check_Image(lua_State *L, int n) {
  Image *imp, im;
  imp = (Image*)luaL_checkudata(L, n, "imlib2.image");
  im = *imp;
  if (im == NULL)
    luaL_argerror(L, n, "image has been freed");
  return im;
}

/* image.new(width, height) */
static int image_new(lua_State *L) {
  int w = luaL_checkint(L, 1);
  int h = luaL_checkint(L, 2);

  Image im = push_Image(L, imlib_create_image(w, h));
  if (im == NULL)
    return luaL_error(L, "imlib_create_image failed");

  return 1;
}

/* image.load(path) */
static int image_load(lua_State *L) {
  const char *path = luaL_checkstring(L, 1);
  Imlib_Load_Error err;
  Image im;

  im = push_Image(L, imlib_load_image_with_error_return(path, &err));
  if (err == IMLIB_LOAD_ERROR_NONE) {
    return 1;
  } else {
    lua_pushnil(L);
    push_load_error_str(L, err, luaL_checkstring(L, 1));
    return 2;
  }
}

static int imagem_tostring(lua_State *L) {
  Image *imp = (Image*)luaL_checkudata(L, 1, "imlib2.image");
  Image im = *imp;
  if (im == NULL) {
    lua_pushfstring(L, "<imlib2.image> (freed)");
  } else {
    imlib_context_set_image(im);
    lua_pushfstring(L, "<imlib2.image width=%d height=%d> (%p)",
        imlib_image_get_width(), imlib_image_get_height(), im);
  }
  return 1;
}

/* img:free() */
static int imagem_free(lua_State *L) {
  Image *imp = (Image*)luaL_checkudata(L, 1, "imlib2.image");
  Image im = *imp;
  if(im) {
    imlib_context_set_image(im);
    imlib_free_image();
    *imp = NULL;
  }
  return 0;
}

/* img:clone() */
static int imagem_clone(lua_State *L) {
  Image old_im = check_Image(L, 1);
  Image new_im;

  imlib_context_set_image(old_im);
  new_im = push_Image(L, imlib_clone_image());
  if (new_im == NULL)
    return luaL_error(L, "imlib_clone_image failed");
  return 1;
}

/* img:get_width() */
static int imagem_get_width(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  lua_pushinteger(L, imlib_image_get_width());
  return 1;
}

/* img:get_height() */
static int imagem_get_height(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  lua_pushinteger(L, imlib_image_get_height());
  return 1;
}

/* img:get_filename() */
static int imagem_get_filename(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  lua_pushstring(L, imlib_image_get_filename());
  return 1;
}

/* img:get_format() */
static int imagem_get_format(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  lua_pushstring(L, imlib_image_format());
  return 1;
}

/* img:set_format(format) */
static int imagem_set_format(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_set_format(luaL_checkstring(L, 2));
  return 0;
}

/* img:has_alpha() */
static int imagem_has_alpha(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  lua_pushboolean(L, imlib_image_has_alpha());
  return 1;
}

/* img:set_alpha(bool) */
static int imagem_set_alpha(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_set_has_alpha(lua_toboolean(L, 1));
  return 0;
}

/* img:get_border() */
static int imagem_get_border(lua_State *L) {
  Image im = check_Image(L, 1);
  Imlib_Border *b = push_Border(L);
  imlib_context_set_image(im);
  imlib_image_get_border(b);
  return 1;
}

/* img:set_border(border) */
static int imagem_set_border(lua_State *L) {
  Image im = check_Image(L, 1);
  Imlib_Border *b = (Imlib_Border*)luaL_checkudata(L, 2, "imlib2.border");
  imlib_context_set_image(im);
  imlib_image_set_border(b);
  return 0;
}

/* img:get_pixel(x, y) */
static int imagem_get_pixel(lua_State *L) {
  Image im = check_Image(L, 1);
  int x = luaL_checkint(L, 2);
  int y = luaL_checkint(L, 3);
  Imlib_Color *c = push_Color(L);
  imlib_context_set_image(im);
  imlib_image_query_pixel(x, y, c);
  return 1;
}

/*** imlib2.image metamethods which wrap functions that return copies (but are  
 * written to change self, to fit in with the rest of the api
 ***/

/* img:crop(x, y, width, height) */
static int imagem_crop(lua_State *L) {
  Image *imp = (Image*)luaL_checkudata(L, 1, "imlib2.image");
  Image old_im;
  int x = luaL_checkint(L, 2);
  int y = luaL_checkint(L, 3);
  int w = luaL_checkint(L, 4);
  int h = luaL_checkint(L, 5);

  old_im = *imp;
  imlib_context_set_image(old_im);
  *imp = imlib_create_cropped_image(x, y, w, h);
  imlib_context_set_image(old_im);
  imlib_free_image();
  return 0;
}

/* img:crop_and_scale(source_x, source_y, source_h, source_w, dest_w, dest_h) */
static int imagem_crop_and_scale(lua_State *L) {
  Image *imp = (Image*)luaL_checkudata(L, 1, "imlib2.image");
  Image old_im;
  int source_x = luaL_checkint(L, 2);
  int source_y = luaL_checkint(L, 3);
  int w = luaL_checkint(L, 4);
  int h = luaL_checkint(L, 5);
  int dest_w = luaL_checkint(L, 6);
  int dest_h = luaL_checkint(L, 7);

  old_im = *imp;
  imlib_context_set_image(old_im);
  *imp =
    imlib_create_cropped_scaled_image(source_x, source_y, w, h, dest_w, dest_h);
  imlib_context_set_image(old_im);
  imlib_free_image();
  return 0;
}

/* img:rotate(angle) */
static int imagem_rotate(lua_State *L) {
  Image *imp = (Image*)luaL_checkudata(L, 1, "imlib2.image");
  Image old_im;
  double angle = luaL_checknumber(L, 2);

  old_im = *imp;
  imlib_context_set_image(old_im);
  *imp = imlib_create_rotated_image(angle);
  imlib_context_set_image(old_im);
  imlib_free_image();
  return 0;
}

/*** End metamethods for copy-returning functions ***/

/* TODO imlib_blend_image_onto_image_at_angle */
/* TODO imlib_blend_image_onto_image_skewed */

/* img:flip_horizontal() */
static int imagem_flip_horizontal(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_flip_horizontal();
  return 1;
}

/* img:flip_vertical() */
static int imagem_flip_vertical(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_flip_vertical();
  return 1;
}

/* img:flip_diagonal() */
static int imagem_flip_diagonal(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_flip_diagonal();
  return 1;
}

/* img:orientate(n) */
static int imagem_orientate(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_orientate(luaL_checkint(L,2));
  return 1;
}

/* img:blue(radius) */
static int imagem_blur(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_blur(luaL_checkint(L,2));
  return 1;
}

/* img:sharpen(radius) */
static int imagem_sharpen(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_sharpen(luaL_checkint(L,2));
  return 1;
}

/* img:tile_horizontal() */
static int imagem_tile_horizontal(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_tile_horizontal();
  return 1;
}

/* img:tile_vertical() */
static int imagem_tile_vertical(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_tile_vertical();
  return 1;
}

/* img:tile() */
static int imagem_tile(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_tile();
  return 1;
}

/* TODO, accept a color argument, wrapping imlib_image_clear_color */
/* img:clear() */
static int imagem_clear(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_image_clear();
  return 1;
}

/* img:draw_pixel(x, y[, color]) */
static int imagem_draw_pixel(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  int x = luaL_checkint(L, 2);
  int y = luaL_checkint(L, 3);
  if (lua_gettop(L)>=4) { /* given a colour */
    Imlib_Color *c = (Imlib_Color*)luaL_checkudata(L, 4, "imlib2.color");
    set_color(c);
  }
  imlib_image_draw_pixel(x, y, 0); /* Buggy for Imlib2 <= 1.0.5 apparently */
  return 0;
}

/* img:draw_line(x1, y1, x2, y2, color) */
static int imagem_draw_line(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  int x1 = luaL_checkint(L, 2);
  int y1 = luaL_checkint(L, 3);
  int x2 = luaL_checkint(L, 4);
  int y2 = luaL_checkint(L, 5);
  if (lua_gettop(L)>=6) /* Given a color */ {
    Imlib_Color *c = (Imlib_Color*)luaL_checkudata(L, 6, "imlib2.color");
    set_color(c);
  }
  imlib_image_draw_line(x1, y1, x2, y2, 0);
  return 0;
}

/* img:draw_rectangle(x, y, width, height[, color]) */
static int imagem_draw_rectangle(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  int x = luaL_checkint(L, 2);
  int y = luaL_checkint(L, 3);
  int width = luaL_checkint(L, 4);
  int height = luaL_checkint(L, 5);
  if (lua_gettop(L)>=6) { /* given a colour */
    Imlib_Color *c = (Imlib_Color*)luaL_checkudata(L, 6, "imlib2.color");
    set_color(c);
  }
  imlib_image_draw_rectangle(x, y, width, height);
  return 0;
}

/* img:fill_rectangle(x, y, width, height, color) */
static int imagem_fill_rectangle(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  int x = luaL_checkint(L, 2);
  int y = luaL_checkint(L, 3);
  int width = luaL_checkint(L, 4);
  int height = luaL_checkint(L, 5);
  if (lua_gettop(L)>=6) { /* given a colour */
    Imlib_Color *c = (Imlib_Color*)luaL_checkudata(L, 6, "imlib2.color");
    set_color(c);
  }
  imlib_image_fill_rectangle(x, y, width, height);
  return 0;
}

/* TODO imlib_copy_alpha_to_image */
/* TODO imlib_copy_alpha_rectangle_to_image */

/* img:scroll_rectangle(x, y, width, height, delta_x, delta_y) */
static int imagem_scroll_rectangle(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  int x = luaL_checkint(L, 2);
  int y = luaL_checkint(L, 3);
  int width = luaL_checkint(L, 4);
  int height = luaL_checkint(L, 5);
  int dx = luaL_checkint(L, 6);
  int dy = luaL_checkint(L, 7);
  imlib_image_scroll_rect(x, y, width, height, dx, dy);
  return 0;
}

/* img:copy_rectangle(x, y, width, height, new_x, new_y) */
static int imagem_copy_rectangle(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  int x = luaL_checkint(L, 2);
  int y = luaL_checkint(L, 3);
  int width = luaL_checkint(L, 4);
  int height = luaL_checkint(L, 5);
  int dest_x = luaL_checkint(L, 6);
  int dest_y = luaL_checkint(L, 7);
  imlib_image_copy_rect(x, y, width, height, dest_x, dest_y);
  return 0;
}

/* img:fill_gradient(gradient, x, y, width, height, angle) */
static int imagem_fill_gradient(lua_State *L) {
  Image im = check_Image(L, 1);
  Gradient gr = check_Gradient(L, 2);
  int x = luaL_checkint(L, 3);
  int y = luaL_checkint(L, 4);
  int width = luaL_checkint(L, 5);
  int height = luaL_checkint(L, 6);
  double angle = luaL_optnumber(L, 7, 0.0);

  imlib_context_set_image(im);
  imlib_context_set_color_range(gr);
  imlib_image_fill_color_range_rectangle(x, y, width, height, angle);
  return 0;
}

/* img:draw_ellipse(xc, yc, a, b[, color]) */
static int imagem_draw_ellipse(lua_State *L) {
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  int xc = luaL_checkint(L, 2);
  int yc = luaL_checkint(L, 3);
  int a = luaL_checkint(L, 4); /* Horizontal amplitude */
  int b = luaL_checkint(L, 5); /* Vertical amplitude */
  if (lua_gettop(L)>=6) { /* given a colour */
    Imlib_Color *c = (Imlib_Color*)luaL_checkudata(L, 6, "imlib2.color");
    set_color(c);
  }
  imlib_image_draw_ellipse(xc, yc, a, b);
  return 0;
}

/* img:fill_ellipse(xc, yc, a, b[, color]) */
static int imagem_fill_ellipse(lua_State *L)
{
  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  int xc = luaL_checkint(L, 2);
  int yc = luaL_checkint(L, 3);
  int a = luaL_checkint(L, 4); /* Horizontal amplitude */
  int b = luaL_checkint(L, 5); /* Vertical amplitude */
  if (lua_gettop(L)>=6) { /* given a colour */
    Imlib_Color *c = (Imlib_Color*)luaL_checkudata(L, 6, "imlib2.color");
    set_color(c);
  }
  imlib_image_fill_ellipse(xc, yc, a, b);
  return 0;
}

/* img:draw_polygon(polygon, closed[, color]) */
static int imagem_draw_polygon(lua_State *L) {
  Image im = check_Image(L, 1);
  Polygon po = check_Polygon(L, 2);
  int closed = lua_toboolean(L, 3);
  if (lua_gettop(L)>=4) { /* given a colour */
    Imlib_Color *c = (Imlib_Color*)luaL_checkudata(L, 4, "imlib2.color");
    set_color(c);
  }
  imlib_context_set_image(im);
  imlib_image_draw_polygon(po, closed);
  return 0;
}

/* img:fill_polygon(polygon[, color]) */
static int imagem_fill_polygon(lua_State *L) {
  Image im = check_Image(L, 1);
  Polygon po = check_Polygon(L, 2);
  if (lua_gettop(L)>=3) { /* given a colour */
    Imlib_Color *c = (Imlib_Color*)luaL_checkudata(L, 4, "imlib2.color");
    set_color(c);
  }
  imlib_context_set_image(im);
  imlib_image_fill_polygon(po);
  return 0;
}

/* img:draw_text(font, string, x, y[, color]) */
static int imagem_draw_text(lua_State *L) {
  Image im = check_Image(L, 1);
  Font fo = check_Font(L, 2);
  const char *str = luaL_checkstring(L, 3);
  int x = luaL_checkint(L, 4);
  int y = luaL_checkint(L, 5);
  Imlib_Color *c =  (Imlib_Color*)luaL_checkudata(L, 6, "imlib2.color");
  int i;
  int r[] = {0,0,0,0};

  imlib_context_set_font(fo);
  imlib_context_set_image(im);
  set_color(c);
  imlib_text_draw_with_return_metrics(x, y, str, &r[0], &r[1], &r[2], &r[3]);
  for (i=0; i < 4; i++)
    lua_pushinteger(L, r[i]);
  return 4;
}

/* TODO: Look at imlib_filter_* */

/* img:save(path) */
static int imagem_save(lua_State *L) {
  Imlib_Load_Error err;

  Image im = check_Image(L, 1);
  imlib_context_set_image(im);
  imlib_save_image_with_error_return(luaL_checkstring(L,2), &err);

  if (err == IMLIB_LOAD_ERROR_NONE) {
    lua_pushboolean(L, 1);
    return 1;
  } else {
    lua_pushnil(L);
    push_load_error_str(L, err, luaL_checkstring(L, 1));
    return 2;
  }
}

/* imlib2 */

/* imlib2.set_anti_alias(bool) */
static int set_anti_alias(lua_State *L) {
  luaL_checkany(L, 1);
  imlib_context_set_anti_alias(lua_toboolean(L, 1));
  return 1;
}

/* imlib2.get_anti_alias() */
static int get_anti_alias(lua_State *L) {
  lua_pushboolean(L, imlib_context_get_anti_alias());
  return 1;
}

/* imlib2.get_cache_size() */
static int get_cache_size(lua_State *L) {
  lua_pushinteger(L, imlib_get_cache_size());
  return 1;
}

/* imlib2.set_cache_size(size) */
static int set_cache_size(lua_State *L) {
  imlib_set_cache_size(luaL_checkint(L, 1));
  return 1;
}

/* imlib2.flush_cache() */
static int flush_cache(lua_State *L) {
  int csize = imlib_get_cache_size();
  imlib_set_cache_size(0);
  imlib_set_cache_size(csize);
  return 0;
}


/*** Registration and initialization ***/

static const struct luaL_Reg border_f [] = {
  {"new", border_new},
  {NULL, NULL}
};

static const struct luaL_Reg border_m [] = {
  {"__tostring", borderm_tostring},
  {"__index", borderm__index},
  {"__newindex", borderm__newindex},
  {NULL, NULL}
};

static const struct luaL_Reg color_f [] = {
  {"new", color_new},
  {NULL, NULL}
};

static const struct luaL_Reg color_m [] = {
  {"__tostring", colorm_tostring},
  {"__index", colorm__index},
  {"__newindex", colorm__newindex},
  {NULL, NULL}
};

static const struct luaL_Reg gradient_f [] = {
  {"new", gradient_new},
  {NULL, NULL}
};

static const struct luaL_Reg gradient_m [] = {
  {"__gc", gradientm_gc},
  {"__tostring", gradientm_tostring},
  {"add_color", gradientm_add_color},
  {NULL, NULL}
};

static const struct luaL_Reg polygon_f [] = {
  {"new", polygon_new},
  {NULL, NULL}
};

static const struct luaL_Reg polygon_m [] = {
  {"__gc", polygonm_gc},
  {"__tostring", polygonm_tostring},
  {"add_point", polygonm_add_point},
  {"get_bounds", polygonm_get_bounds},
  {"contains_point", polygonm_contains_point},
  {NULL, NULL}
};

static const struct luaL_Reg font_f [] = {
  {"load", font_load},
  {"add_path", font_add_path},
  {"remove_path", font_remove_path},
  {"list_paths", font_list_paths},
  {"list_fonts", font_list_fonts},
  {"get_cache_size", font_get_cache_size},
  {"set_cache_size", font_set_cache_size},
  {"set_direction", font_set_direction},
  {"get_direction", font_get_direction},
  {NULL, NULL}
};

static const struct luaL_Reg font_m [] = {
  {"__gc", fontm_gc},
  {"__tostring", fontm_tostring},
  {"get_size", fontm_get_size},
  {"get_advance", fontm_get_advance},
  {"get_inset", fontm_get_inset},
  {"get_ascent", fontm_get_ascent},
  {"get_maximum_ascent", fontm_get_maximum_ascent},
  {"get_descent", fontm_get_descent},
  {"get_maximum_descent", fontm_get_maximum_descent},
  {NULL, NULL}
};


static const struct luaL_Reg image_f [] = {
  {"new", image_new},
  {"load", image_load},
  {NULL, NULL}
};

static const struct luaL_Reg image_m [] = {
  {"__tostring", imagem_tostring},
  {"__gc", imagem_free},
  {"free", imagem_free},
  {"get_width", imagem_get_width},
  {"get_height", imagem_get_height},
  {"get_filename", imagem_get_filename},
  {"get_format", imagem_get_format},
  {"set_format", imagem_set_format},
  {"has_alpha", imagem_has_alpha},
  {"set_has_alpha", imagem_set_alpha},
  {"get_border", imagem_get_border},
  {"set_border", imagem_set_border},
  {"get_pixel", imagem_get_pixel},
  {"crop", imagem_crop},
  {"crop_and_scale", imagem_crop_and_scale},
  {"rotate", imagem_rotate},
  {"flip_horizontal", imagem_flip_horizontal},
  {"flip_vertical", imagem_flip_vertical},
  {"flip_diagonal", imagem_flip_diagonal},
  {"orientate", imagem_orientate},
  {"blur", imagem_blur},
  {"sharpen", imagem_sharpen},
  {"tile_horizontal", imagem_tile_horizontal},
  {"tile_vertical", imagem_tile_vertical},
  {"tile", imagem_tile},
  {"clear", imagem_clear},
  {"draw_pixel", imagem_draw_pixel},
  {"draw_line", imagem_draw_line},
  {"draw_rectangle", imagem_draw_rectangle},
  {"fill_rectangle", imagem_fill_rectangle},
  {"scroll_rectangle", imagem_scroll_rectangle},
  {"copy_rectangle", imagem_copy_rectangle},
  {"draw_polygon", imagem_draw_polygon},
  {"fill_polygon", imagem_fill_polygon},
  {"fill_gradient", imagem_fill_gradient},
  {"draw_ellipse", imagem_draw_ellipse},
  {"fill_ellipse", imagem_fill_ellipse},
  {"draw_text", imagem_draw_text},
  {"clone", imagem_clone},
  {"save", imagem_save},
  {NULL, NULL}
};

static const struct luaL_Reg f [] = {
  {"set_anti_alias", set_anti_alias},
  {"get_anti_alias", get_anti_alias},
  {"get_cache_size", get_cache_size},
  {"set_cache_size", set_cache_size},
  {"flush_cache", flush_cache},
  {NULL, NULL}
};

int luaopen_limlib2(lua_State *L) {
  imlib_context_set_anti_alias(1); /* Ensure anti-alias by default */

  luaL_newmetatable(L, "imlib2.border");
  lua_pushvalue(L, -1);
  lua_setfield(L, -2, "__index");
  luaL_register(L, NULL, border_m);
  luaL_register(L, "imlib2.border", border_f);

  luaL_newmetatable(L, "imlib2.color");
  lua_pushvalue(L, -1);
  lua_setfield(L, -2, "__index");
  luaL_register(L, NULL, color_m);
  luaL_register(L, "imlib2.color", color_f);

  luaL_newmetatable(L, "imlib2.gradient");
  lua_pushvalue(L, -1);
  lua_setfield(L, -2, "__index");
  luaL_register(L, NULL, gradient_m);
  luaL_register(L, "imlib2.gradient", gradient_f);

  luaL_newmetatable(L, "imlib2.polygon");
  lua_pushvalue(L, -1);
  lua_setfield(L, -2, "__index");
  luaL_register(L, NULL, polygon_m);
  luaL_register(L, "imlib2.polygon", polygon_f);

  luaL_newmetatable(L, "imlib2.font");
  lua_pushvalue(L, -1);
  lua_setfield(L, -2, "__index");
  luaL_register(L, NULL, font_m);
  luaL_register(L, "imlib2.font", font_f);

  luaL_newmetatable(L, "imlib2.image");
  lua_pushvalue(L, -1);
  lua_setfield(L, -2, "__index");
  luaL_register(L, NULL, image_m);
  luaL_register(L, "imlib2.image", image_f);

  luaL_register(L, "imlib2", f);

  return 1;
}