/*****************************************************************************\
file:GetAttribute(attrib)
\*****************************************************************************/
static int imluaFileGetAttribute (lua_State *L)
{
int data_type;
int i, count;
const void *data;
int as_string = 0;
imFile *ifile = imlua_checkfile(L, 1);
const char *attrib = luaL_checkstring(L, 2);
data = imFileGetAttribute(ifile, attrib, &data_type, &count);
if (!data)
{
lua_pushnil(L);
return 1;
}
if (data_type == IM_BYTE && lua_isboolean(L, 3))
as_string = lua_toboolean(L, 3);
if (!as_string)
lua_newtable(L);
switch (data_type)
{
case IM_BYTE:
{
if (as_string)
{
lua_pushstring(L, (const char*)data);
}
else
{
imbyte *data_byte = (imbyte*) data;
for (i = 0; i < count; i++, data_byte++)
{
lua_pushnumber(L, *data_byte);
lua_rawseti(L, -2, i+1);
}
}
}
break;
case IM_SHORT:
{
short *data_short = (short*) data;
for (i = 0; i < count; i++, data_short += 2)
{
lua_pushnumber(L, *data_short);
lua_rawseti(L, -2, i+1);
}
}
break;
case IM_USHORT:
{
imushort *data_ushort = (imushort*) data;
for (i = 0; i < count; i++, data_ushort += 2)
{
lua_pushnumber(L, *data_ushort);
lua_rawseti(L, -2, i+1);
}
}
break;
case IM_INT:
{
int *data_int = (int*) data;
for (i = 0; i < count; i++, data_int++)
{
lua_pushnumber(L, *data_int);
lua_rawseti(L, -2, i+1);
}
}
break;
case IM_FLOAT:
{
float *data_float = (float*) data;
for (i = 0; i < count; i++, data_float++)
{
lua_pushnumber(L, *data_float);
lua_rawseti(L, -2, i+1);
}
}
break;
case IM_CFLOAT:
{
float *data_float = (float*) data;
for (i = 0; i < count; i++, data_float += 2)
{
imlua_newarrayfloat(L, data_float, 2, 1);
lua_rawseti(L, -2, i+1);
}
}
break;
case IM_DOUBLE:
{
double *data_double = (double*) data;
for (i = 0; i < count; i++, data_double++)
{
lua_pushnumber(L, *data_double);
lua_rawseti(L, -2, i+1);
}
}
break;
case IM_CDOUBLE:
{
double *data_double = (double*) data;
for (i = 0; i < count; i++, data_double += 2)
{
imlua_newarraydouble(L, data_double, 2, 1);
lua_rawseti(L, -2, i+1);
}
}
break;
}
lua_pushinteger(L, data_type);
return 2;
}
/*****************************************************************************\
image row indexing
\*****************************************************************************/
static int imluaImageRow_index (lua_State *L)
{
int index;
imluaImageRow *imagerow = imlua_checkimagerow(L, 1);
imImage *image = imagerow->image;
int channel = imagerow->channel;
int row = imagerow->row;
int column = luaL_checkint(L, 2);
void* channel_buffer = image->data[channel];
if (column < 0 || column >= imagerow->image->width)
luaL_argerror(L, 2, "invalid column, out of bounds");
index = row * image->width + column;
switch (image->data_type)
{
case IM_BYTE:
{
imbyte *bdata = (imbyte*) channel_buffer;
lua_pushnumber(L, (lua_Number) bdata[index]);
}
break;
case IM_SHORT:
{
short *sdata = (short*) channel_buffer;
lua_pushnumber(L, (lua_Number) sdata[index]);
}
break;
case IM_USHORT:
{
imushort *udata = (imushort*) channel_buffer;
lua_pushnumber(L, (lua_Number) udata[index]);
}
break;
case IM_INT:
{
int *idata = (int*) channel_buffer;
lua_pushnumber(L, (lua_Number) idata[index]);
}
break;
case IM_FLOAT:
{
float *fdata = (float*) channel_buffer;
lua_pushnumber(L, (lua_Number) fdata[index]);
}
break;
case IM_CFLOAT:
{
float *cdata = (float*) channel_buffer;
imlua_newarrayfloat(L, cdata + (2*index), 2, 1);
}
break;
}
return 1;
}
