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|
/* limglib.c
Copyright 2006-2013 Taco Hoekwater <taco@luatex.org>
This file is part of LuaTeX.
LuaTeX is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
LuaTeX is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU General Public License along
with LuaTeX; if not, see <http://www.gnu.org/licenses/>. */
#include "ptexlib.h"
#include "lua/luatex-api.h"
#include <stdio.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#define img_types_max 7
const char *img_types[] = {
"none",
"pdf",
"png",
"jpg",
"jp2",
"jbig2",
"stream",
"memstream",
NULL
};
static void copy_image(lua_State * L, lua_Number scale)
{
image *a, **aa, *b, **bb;
image_dict *d;
if (lua_gettop(L) == 0)
luaL_error(L, "img.copy needs an image as argument");
aa = (image **) luaL_checkudata(L, 1, TYPE_IMG); /* a */
lua_pop(L, 1); /* - */
a = *aa;
bb = (image **) lua_newuserdata(L, sizeof(image *)); /* b */
luaL_getmetatable(L, TYPE_IMG); /* m b */
lua_setmetatable(L, -2); /* b */
b = *bb = new_image();
if (!is_wd_running(a))
img_width(b) = do_zround(img_width(a) * scale);
if (!is_ht_running(a))
img_height(b) = do_zround(img_height(a) * scale);
if (!is_dp_running(a))
img_depth(b) = do_zround(img_depth(a) * scale);
img_transform(b) = img_transform(a);
img_dict(b) = img_dict(a);
if (img_dictref(a) != LUA_NOREF) {
lua_rawgeti(L, LUA_REGISTRYINDEX, img_dictref(a)); /* ad b */
img_dictref(b) = luaL_ref(L, LUA_REGISTRYINDEX); /* b */
d = img_dict(*aa);
img_luaref(d) += 1;
} else if (img_state(img_dict(a)) < DICT_REFERED) {
luaL_error(L, "img.copy needs an proper image as argument");
}
}
static void lua_to_image(lua_State * L, image * a, image_dict * d);
int l_new_image(lua_State * L)
{
image *a, **aa;
image_dict **add;
if (lua_gettop(L) > 0 && ! lua_istable(L, -1)) {
luaL_error(L, "img.new needs table as optional argument"); /* (t) */
}
aa = (image **) lua_newuserdata(L, sizeof(image *)); /* i (t) */
luaL_getmetatable(L, TYPE_IMG); /* m i (t) */
lua_setmetatable(L, -2); /* i (t) */
a = *aa = new_image();
add = (image_dict **) lua_newuserdata(L, sizeof(image_dict *)); /* ad i (t) */
luaL_getmetatable(L, TYPE_IMG_DICT); /* m ad i (t) */
lua_setmetatable(L, -2); /* ad i (t) */
img_dict(a) = *add = new_image_dict();
img_dictref(a) = luaL_ref(L, LUA_REGISTRYINDEX); /* i (t) */
img_luaref(*add) += 1;
if (lua_gettop(L) == 2) { /* i t, else just i */
lua_insert(L, -2); /* t i */
lua_pushnil(L); /* n t i (1st key for iterator) */
while (lua_next(L, -2) != 0) { /* v k t i */
lua_to_image(L, a, *add); /* v k t i */
lua_pop(L, 1); /* k t i */
} /* t i */
lua_pop(L, 1); /* i */
} /* i */
return 1; /* i */
}
static int l_copy_image(lua_State * L)
{
if (lua_gettop(L) != 1) {
luaL_error(L, "img.copy needs an image as argument");
} else if (lua_istable(L, 1)) {
(void) l_new_image(L);
} else {
(void) copy_image(L, 1.0);
}
return 1;
}
static void read_scale_img(image * a)
{
image_dict *ad;
if (a == NULL) {
luaL_error(Luas, "the image scaler needs a valid image");
} else {
ad = img_dict(a);
if (a == NULL) {
luaL_error(Luas, "the image scaler needs a valid dictionary");
} else {
if (img_state(ad) == DICT_NEW) {
if (img_type(ad) == IMG_TYPE_PDFSTREAM)
check_pdfstream_dict(ad);
else {
read_img(ad);
}
}
if ((img_type(ad) == IMG_TYPE_NONE) || (img_state(ad) == DICT_NEW)) {
normal_warning("image","don't rely on the image data to be okay");
img_width(a) = 0;
img_height(a) = 0;
img_depth(a) = 0;
} else if (is_wd_running(a) || is_ht_running(a) || is_dp_running(a)) {
img_dimen(a) = scale_img(ad, img_dimen(a), img_transform(a));
}
}
}
}
static int l_scan_image(lua_State * L)
{
image *a, **aa;
if (lua_gettop(L) != 1)
luaL_error(L, "img.scan needs exactly 1 argument");
if (lua_istable(L, 1))
(void) l_new_image(L);
aa = (image **) luaL_checkudata(L, 1, TYPE_IMG);
a = *aa;
check_o_mode(static_pdf, "img.scan", 1 << OMODE_PDF, false);
read_scale_img(a);
return 1;
}
static halfword img_to_node(lua_State * L, image * a)
{
image_dict *ad;
halfword n = null;
if (a == NULL) {
luaL_error(L, "img.tonode needs a valid image");
} else {
ad = img_dict(a);
if (a == NULL) {
luaL_error(L, "img.tonode image has no dictionary");
} else if (img_objnum(ad) == 0) {
luaL_error(L, "img.tonode got image without object number");
} else {
n = new_rule(image_rule);
rule_index(n) = img_index(ad);
width(n) = img_width(a);
height(n) = img_height(a);
depth(n) = img_depth(a);
rule_transform(n) = img_transform(a);
}
}
return n;
}
typedef enum {
WR_WRITE,
WR_IMMEDIATEWRITE,
WR_NODE,
WR_VF_IMG
} wrtype_e;
const char *wrtype_s[] = {
"img.write()",
"img.immediatewrite()",
"img.node()",
"write vf image"
};
static void setup_image(PDF pdf, image * a, wrtype_e writetype)
{
image_dict *ad;
if (a == NULL)
luaL_error(Luas, "no valid image passed"); /* todo, also check in caller */
ad = img_dict(a);
check_o_mode(pdf, wrtype_s[writetype], 1 << OMODE_PDF, false);
read_scale_img(a);
if (img_objnum(ad) == 0) { /* latest needed just before out_img() */
pdf->ximage_count++;
img_objnum(ad) = pdf_create_obj(pdf, obj_type_ximage, pdf->ximage_count);
img_index(ad) = pdf->ximage_count;
idict_to_array(ad); /* from now on ad is read-only */
obj_data_ptr(pdf, pdf->obj_ptr) = img_index(ad);
}
}
static void write_image_or_node(lua_State * L, wrtype_e writetype)
{
image *a, **aa;
image_dict *ad;
halfword n;
if (lua_gettop(L) != 1)
luaL_error(L, "%s expects an argument", wrtype_s[writetype]);
if (lua_istable(L, 1))
(void) l_new_image(L);
aa = (image **) luaL_checkudata(L, 1, TYPE_IMG);
a = *aa;
ad = img_dict(a);
setup_image(static_pdf, a, writetype);
switch (writetype) {
case WR_WRITE:
n = img_to_node(L, a);
tail_append(n);
break;
case WR_IMMEDIATEWRITE:
write_img(static_pdf, ad);
break;
case WR_NODE:
lua_pop(L, 1); /* - */
n = img_to_node(L, a);
lua_nodelib_push_fast(L, n);
break;
default:
luaL_error(L, "%s expects an valid image", wrtype_s[writetype]);
}
if (img_state(ad) < DICT_REFERED)
img_state(ad) = DICT_REFERED;
}
static int l_write_image(lua_State * L)
{
write_image_or_node(L, WR_WRITE);
return 1;
}
static int l_immediatewrite_image(lua_State * L)
{
check_o_mode(static_pdf, "img.immediatewrite", 1 << OMODE_PDF, true);
if (global_shipping_mode != NOT_SHIPPING) {
luaL_error(L, "img.immediatewrite can not be used with \\latelua");
} else {
write_image_or_node(L, WR_IMMEDIATEWRITE);
}
return 1;
}
static int l_image_node(lua_State * L)
{
write_image_or_node(L, WR_NODE);
return 1;
}
static int l_image_keys(lua_State * L)
{
return lua_show_valid_keys(L, img_parms, img_parms_max);
}
static int l_image_types(lua_State * L)
{
return lua_show_valid_list(L, img_types, img_types_max);
}
static int l_image_boxes(lua_State * L)
{
return lua_show_valid_keys(L, img_pageboxes, img_pageboxes_max);
}
static const struct luaL_Reg imglib_f[] = {
{ "new", l_new_image },
{ "copy", l_copy_image },
{ "scan", l_scan_image },
{ "write", l_write_image },
{ "immediatewrite", l_immediatewrite_image },
{ "node", l_image_node },
{ "keys", l_image_keys },
{ "types", l_image_types },
{ "boxes", l_image_boxes },
{ NULL, NULL }
};
void vf_out_image(PDF pdf, unsigned i)
{
image *a, **aa;
image_dict *ad;
lua_rawgeti(Luas, LUA_REGISTRYINDEX, (int) i);
aa = (image **) luaL_checkudata(Luas, -1, TYPE_IMG);
a = *aa;
ad = img_dict(a);
if (ad == NULL) {
luaL_error(Luas, "invalid image dictionary");
}
setup_image(pdf, a, WR_VF_IMG);
place_img(pdf, ad, img_dimen(a), img_transform(a));
lua_pop(Luas, 1);
}
/* metamethods for image */
static int m_img_get(lua_State * L)
{
int j;
const char *s;
image **a = (image **) luaL_checkudata(L, 1, TYPE_IMG); /* k u */
image_dict *d = img_dict(*a);
if (d == NULL) {
luaL_error(L, "invalid image dictionary");
}
s = lua_tostring(L, 2);
if (lua_key_eq(s,width)) {
if (is_wd_running(*a)) {
lua_pushnil(L);
} else {
lua_pushinteger(L, img_width(*a));
}
} else if (lua_key_eq(s,height)) {
if (is_ht_running(*a)) {
lua_pushnil(L);
} else {
lua_pushinteger(L, img_height(*a));
}
} else if (lua_key_eq(s,depth)) {
if (is_dp_running(*a)) {
lua_pushnil(L);
} else {
lua_pushinteger(L, img_depth(*a));
}
} else if (lua_key_eq(s,transform)) {
lua_pushinteger(L, img_transform(*a));
} else if (lua_key_eq(s,filename)) {
if (img_filename(d) == NULL || strlen(img_filename(d)) == 0) {
lua_pushnil(L);
} else {
lua_pushstring(L, img_filename(d));
}
} else if (lua_key_eq(s,visiblefilename)) {
if (img_visiblefilename(d) == NULL || strlen(img_visiblefilename(d)) == 0) {
lua_pushnil(L);
} else {
lua_pushstring(L, img_visiblefilename(d));
}
} else if (lua_key_eq(s,keepopen)) {
lua_pushboolean(L, img_keepopen(d));
} else if (lua_key_eq(s,filepath)) {
if (img_filepath(d) == NULL || strlen(img_filepath(d)) == 0) {
lua_pushnil(L);
} else {
lua_pushstring(L, img_filepath(d));
}
} else if (lua_key_eq(s,attr)) {
if (img_attr(d) == NULL || strlen(img_attr(d)) == 0) {
lua_pushnil(L);
} else {
lua_pushstring(L, img_attr(d));
}
} else if (lua_key_eq(s,page)) {
if (img_pagename(d) != NULL && strlen(img_pagename(d)) != 0) {
lua_pushstring(L, img_pagename(d));
} else {
lua_pushinteger(L, img_pagenum(d));
}
} else if (lua_key_eq(s,pages)) {
lua_pushinteger(L, img_totalpages(d));
} else if (lua_key_eq(s,xsize)) {
if ((img_rotation(d) & 1) == 0) {
lua_pushinteger(L, img_xsize(d));
} else {
lua_pushinteger(L, img_ysize(d));
}
} else if (lua_key_eq(s,ysize)) {
if ((img_rotation(d) & 1) == 0) {
lua_pushinteger(L, img_ysize(d));
} else {
lua_pushinteger(L, img_xsize(d));
}
} else if (lua_key_eq(s,xres)) {
lua_pushinteger(L, img_xres(d));
} else if (lua_key_eq(s,yres)) {
lua_pushinteger(L, img_yres(d));
} else if (lua_key_eq(s,rotation)) {
lua_pushinteger(L, img_rotation(d));
} else if (lua_key_eq(s,colorspace)) {
if (img_colorspace(d) == 0) {
lua_pushnil(L);
} else {
lua_pushinteger(L, img_colorspace(d));
}
} else if (lua_key_eq(s,colordepth)) {
if (img_colordepth(d) == 0) {
lua_pushnil(L);
} else {
lua_pushinteger(L, img_colordepth(d));
}
} else if (lua_key_eq(s,imagetype)) {
j = img_type(d);
if (j >= 0 && j <= img_types_max) {
if (j == IMG_TYPE_NONE) {
lua_pushnil(L);
} else {
lua_pushstring(L, img_types[j]);
}
} else {
lua_pushnil(L);
}
} else if (lua_key_eq(s,pagebox)) {
j = img_pagebox(d);
if (j < 0 || j >= img_pageboxes_max) {
j = 0;
}
lua_push_img_pagebox(L, j);
} else if (lua_key_eq(s,bbox)) {
if (!img_is_bbox(d)) {
img_bbox(d)[0] = img_xorig(d);
img_bbox(d)[1] = img_yorig(d);
img_bbox(d)[2] = img_xorig(d) + img_xsize(d);
img_bbox(d)[3] = img_yorig(d) + img_ysize(d);
}
lua_newtable(L);
lua_pushinteger(L, 1);
lua_pushinteger(L, img_bbox(d)[0]);
lua_settable(L, -3);
lua_pushinteger(L, 2);
lua_pushinteger(L, img_bbox(d)[1]);
lua_settable(L, -3);
lua_pushinteger(L, 3);
lua_pushinteger(L, img_bbox(d)[2]);
lua_settable(L, -3);
lua_pushinteger(L, 4);
lua_pushinteger(L, img_bbox(d)[3]);
lua_settable(L, -3);
} else if (lua_key_eq(s,objnum)) {
if (img_objnum(d) == 0) {
lua_pushnil(L);
} else {
lua_pushinteger(L, img_objnum(d));
}
} else if (lua_key_eq(s,index)) {
if (img_index(d) == 0) {
lua_pushnil(L);
} else {
lua_pushinteger(L, img_index(d));
}
} else if (lua_key_eq(s,stream)) {
if (img_type(d) != IMG_TYPE_PDFSTREAM
|| img_pdfstream_ptr(d) == NULL
|| img_pdfstream_stream(d) == NULL
|| strlen(img_pdfstream_stream(d)) == 0) {
lua_pushnil(L);
} else {
lua_pushstring(L, img_pdfstream_stream(d));
}
} else if (lua_key_eq(s,ref_count)) {
lua_pushinteger(L, img_luaref(d));
} else {
lua_pushnil(L);
}
return 1;
}
static void lua_to_image(lua_State * L, image * a, image_dict * d)
{
int i, t;
const char *s;
s = lua_tostring(L,-2);
t = lua_type(L, -1);
if (lua_key_eq(s,width)) {
if (t == LUA_TNIL) {
set_wd_running(a);
} else if (t == LUA_TNUMBER) {
img_width(a) = (int) lua_tointeger(L, -1);
} else if (t == LUA_TSTRING) {
img_width(a) = dimen_to_number(L, lua_tostring(L, -1));
} else {
luaL_error(L, "image.width needs integer or nil value or dimension string");
}
} else if (lua_key_eq(s,height)) {
if (t == LUA_TNIL) {
set_ht_running(a);
} else if (t == LUA_TNUMBER) {
img_height(a) = (int) lua_tointeger(L, -1);
} else if (t == LUA_TSTRING) {
img_height(a) = dimen_to_number(L, lua_tostring(L, -1));
} else {
luaL_error(L, "image.height needs integer or nil value or dimension string");
}
} else if (lua_key_eq(s,depth)) {
if (t == LUA_TNIL) {
set_dp_running(a);
} else if (t == LUA_TNUMBER) {
img_depth(a) = (int) lua_tointeger(L, -1);
} else if (t == LUA_TSTRING) {
img_depth(a) = dimen_to_number(L, lua_tostring(L, -1));
} else {
luaL_error(L, "image.depth needs integer or nil value or dimension string");
}
} else if (lua_key_eq(s,transform)) {
if (t == LUA_TNUMBER) {
img_transform(a) = (int) lua_tointeger(L, -1);
} else {
luaL_error(L, "image.transform needs integer value");
}
} else if (lua_key_eq(s,filename)) {
if (img_state(d) >= DICT_FILESCANNED) {
luaL_error(L, "image.filename is now read-only");
} else if (img_type(d) == IMG_TYPE_PDFSTREAM) {
luaL_error(L, "image.filename can't be used with image.stream");
} else if (t == LUA_TSTRING) {
xfree(img_filename(d));
img_filename(d) = xstrdup(lua_tostring(L, -1));
} else {
luaL_error(L, "image.filename needs string value");
}
} else if (lua_key_eq(s,visiblefilename)) {
if (img_state(d) >= DICT_FILESCANNED) {
luaL_error(L, "image.visiblefilename is now read-only");
} else if (img_type(d) == IMG_TYPE_PDFSTREAM) {
luaL_error(L, "image.visiblefilename can't be used with image.stream");
} else if (t == LUA_TSTRING) {
xfree(img_visiblefilename(d));
img_visiblefilename(d) = xstrdup(lua_tostring(L, -1));
} else {
luaL_error(L, "image.visiblefilename needs string value");
}
} else if (lua_key_eq(s,attr)) {
if (img_state(d) >= DICT_FILESCANNED) {
luaL_error(L, "image.attr is now read-only");
} else if (t == LUA_TSTRING) {
xfree(img_attr(d));
img_attr(d) = xstrdup(lua_tostring(L, -1));
} else if (t == LUA_TNIL) {
xfree(img_attr(d));
} else {
luaL_error(L, "image.attr needs string or nil value");
}
} else if (lua_key_eq(s,page)) {
if (img_state(d) >= DICT_FILESCANNED) {
luaL_error(L, "image.page is now read-only");
} else if (t == LUA_TSTRING) {
xfree(img_pagename(d));
img_pagename(d) = xstrdup(lua_tostring(L, -1));
img_pagenum(d) = 0;
} else if (t == LUA_TNUMBER) {
img_pagenum(d) = (int) lua_tointeger(L, -1);
xfree(img_pagename(d));
} else {
luaL_error(L, "image.page needs integer or string value");
}
} else if (lua_key_eq(s,colorspace)) {
if (img_state(d) >= DICT_FILESCANNED) {
luaL_error(L, "image.colorspace is now read-only");
} else if (t == LUA_TNIL) {
img_colorspace(d) = 0;
} else if (t == LUA_TNUMBER) {
img_colorspace(d) = (int) lua_tointeger(L, -1);
} else {
luaL_error(L, "image.colorspace needs integer or nil value");
}
} else if (lua_key_eq(s,pagebox)) {
if (img_state(d) >= DICT_FILESCANNED) {
luaL_error(L, "image.pagebox is now read-only");
} else if (t == LUA_TNIL) {
img_pagebox(d) = PDF_BOX_SPEC_MEDIA;
} else if (t == LUA_TNUMBER) {
i = lua_tointeger(L,-1);
if (i < 0 || i >= img_pageboxes_max) {
img_pagebox(d) = PDF_BOX_SPEC_MEDIA;
} else {
img_pagebox(d) = i;
}
} else if (t == LUA_TSTRING) {
img_pagebox(d) = PDF_BOX_SPEC_MEDIA;
for (i = 0; i < img_pageboxes_max; i++) {
lua_rawgeti(L, LUA_REGISTRYINDEX, img_pageboxes[i]);
if (lua_rawequal(L,-1,-2)) {
img_pagebox(d) = i;
lua_pop(L, 1);
break;
} else {
lua_pop(L, 1);
}
}
} else {
luaL_error(L, "image.pagebox needs string, number or nil value");
}
} else if (lua_key_eq(s,keepopen)) {
if (img_state(d) >= DICT_FILESCANNED) {
luaL_error(L, "image.keepopen is now read-only");
} else if (t != LUA_TBOOLEAN) {
luaL_error(L, "image.bbox needs boolean value");
} else {
img_keepopen(d) = lua_toboolean(L, -1);
}
} else if (lua_key_eq(s,bbox)) {
if (img_state(d) >= DICT_FILESCANNED) {
luaL_error(L, "image.bbox is now read-only");
} else if (t != LUA_TTABLE) {
luaL_error(L, "image.bbox needs table value");
} else if (lua_rawlen(L, -1) != 4) {
luaL_error(L, "image.bbox table must have exactly 4 elements");
} else {
for (i = 1; i <= 4; i++) { /* v k t ... */
lua_pushinteger(L, i); /* idx v k t ... */
lua_gettable(L, -2); /* int v k t ... */
t = lua_type(L, -1);
if (t == LUA_TNUMBER) {
img_bbox(d)[i - 1] = (int) lua_tointeger(L, -1);
} else if (t == LUA_TSTRING) {
img_bbox(d)[i - 1] = dimen_to_number(L, lua_tostring(L, -1));
} else {
luaL_error(L, "image.bbox table needs integer value or dimension string elements");
}
lua_pop(L, 1); /* v k t ... */
}
img_set_bbox(d);
}
} else if (lua_key_eq(s,stream)) {
if (img_filename(d) != NULL) {
luaL_error(L, "image.stream can't be used with image.filename");
} else if (img_state(d) >= DICT_FILESCANNED) {
luaL_error(L, "image.stream is now read-only");
} else {
if (img_pdfstream_ptr(d) == NULL) {
new_img_pdfstream_struct(d);
}
xfree(img_pdfstream_stream(d));
img_pdfstream_stream(d) = xstrdup(lua_tostring(L, -1));
img_type(d) = IMG_TYPE_PDFSTREAM;
}
} else {
luaL_error(L, "image.%s can not be set", s);
}
}
static int m_img_set(lua_State * L)
{
image **a = (image **) luaL_checkudata(L, 1, TYPE_IMG); /* v k u */
image_dict *d = img_dict(*a);
if (d == NULL) {
luaL_error(L, "invalid image dictionary");
} else {
lua_to_image(L, *a, d);
}
return 0;
}
static int m_img_mul(lua_State * L)
{
lua_Number scale;
if (lua_type(L, 1) == LUA_TNUMBER) { /* u? n */
(void) luaL_checkudata(L, 2, TYPE_IMG); /* u n */
lua_insert(L, -2); /* n a */
} else if (lua_type(L, 2) != LUA_TNUMBER) { /* n u? */
(void) luaL_checkudata(L, 1, TYPE_IMG); /* n a */
} /* n a */
scale = lua_tonumber(L, 2); /* float */ /* n a */
lua_pop(L, 1); /* a */
copy_image(L, scale); /* b */
return 1;
}
static int m_img_print(lua_State * L)
{
image **aa;
image_dict *d;
aa = (image **) luaL_checkudata(L, 1, TYPE_IMG);
d = img_dict(*aa);
/* formatted a bit like a node */
if (img_filename(d) == NULL) {
if (img_pagename(d) != NULL && strlen(img_pagename(d)) != 0) {
lua_pushfstring(L, "<img unset : %d >", img_dictref(*aa));
} else {
lua_pushfstring(L, "<img unset : %d >", img_dictref(*aa));
}
} else {
if (img_pagename(d) != NULL && strlen(img_pagename(d)) != 0) {
lua_pushfstring(L, "<img %s : %s : %d >", img_filename(d), img_pagename(d), img_dictref(*aa));
} else {
lua_pushfstring(L, "<img %s : %d : %d >", img_filename(d), img_pagenum(d), img_dictref(*aa));
}
}
return 1;
}
/* this finalizes instance */
static int m_img_gc(lua_State * L)
{
image *a, **aa;
image_dict *d;
aa = (image **) luaL_checkudata(L, 1, TYPE_IMG);
a = *aa;
d = img_dict(*aa);
luaL_unref(L, LUA_REGISTRYINDEX, img_dictref(a));
img_luaref(d) -= 1;
/* we need to check this */
if (!img_is_refered(d)) {
xfree(a);
}
/* till here */
return 0;
}
/* the instance */
static const struct luaL_Reg img_m[] = {
{"__index", m_img_get},
{"__newindex", m_img_set},
{"__mul", m_img_mul},
{"__tostring", m_img_print},
{"__gc", m_img_gc},
{NULL, NULL}
};
/* this finalizes the dict */
static int m_img_dict_gc(lua_State * L)
{
image_dict *ad, **add;
add = (image_dict **) luaL_checkudata(L, 1, TYPE_IMG_DICT);
ad = *add;
if (img_luaref(ad) > 0) {
luaL_error(L, "disposing image dict that has references");
} else {
/* we need to check this */
if (img_state(ad) < DICT_REFERED) {
free_image_dict(ad);
}
/* till here */
}
return 0;
}
/* the (shared) dict */
static const struct luaL_Reg img_dict_m[] = {
{"__gc", m_img_dict_gc},
{NULL, NULL}
};
int luaopen_img(lua_State * L)
{
luaL_newmetatable(L, TYPE_IMG);
#ifdef LuajitTeX
luaL_register(L, NULL, img_m);
luaL_newmetatable(L, TYPE_IMG_DICT);
luaL_register(L, NULL, img_dict_m);
luaL_register(L, "img", imglib_f);
#else
luaL_setfuncs(L, img_m, 0);
luaL_newmetatable(L, TYPE_IMG_DICT);
luaL_setfuncs(L, img_dict_m, 0);
luaL_newlib(L, imglib_f);
#endif
return 1;
}
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