static void sample_data(texgz_tex_t* src,
texgz_tex_t* dst,
int x, int y,
int i, int j,
int m, int n,
double latT, double lonL,
double latB, double lonR)
{
assert(src);
assert(dst);
LOGD("debug x=%i, y=%i, i=%i, j=%i, m=%i, n=%i, latT=%lf, lonL=%lf, latB=%lf, lonR=%lf",
x, y, i, j, m, n, latT, lonL, latB, lonR);
// make a dummy tile
nedgz_tile_t* tile = nedgz_tile_new(x, y, 9);
if(tile == NULL)
{
return;
}
// compute sample coords
double lat;
double lon;
tile_coord(tile, i, j, m, n, &lat, &lon);
// compute u, v
float u = (float) ((lon - lonL)/(lonR - lonL));
float v = (float) ((lat - latT)/(latB - latT));
// interpolate color
unsigned char r;
unsigned char g;
unsigned char b;
interpolatec(src, u, v, &r, &g, &b);
// store color
unsigned char* pixels = dst->pixels;
int stride = dst->stride;
int bpp = texgz_tex_bpp(dst);
int idx = m*stride*bpp + n*bpp;
pixels[idx + 0] = r;
pixels[idx + 1] = g;
pixels[idx + 2] = b;
nedgz_tile_delete(&tile);
}
static int sample_subtile(nedgz_tile_t* tile, int i, int j,
pak_file_t* pak)
{
assert(tile);
LOGD("debug i=%i, j=%i", i, j);
texgz_tex_t* tex = texgz_tex_new(SUBTILE_SIZE,
SUBTILE_SIZE,
SUBTILE_SIZE,
SUBTILE_SIZE,
TEXGZ_SHORT,
TEXGZ_LUMINANCE,
NULL);
if(tex == NULL)
{
return 0;
}
int m;
int n;
for(m = 0; m < SUBTILE_SIZE; ++m)
{
for(n = 0; n < SUBTILE_SIZE; ++n)
{
double lat;
double lon;
tile_coord(tile, i, j, m, n, &lat, &lon);
// flt_cc most likely place to find sample
// At edges of range a subtile may not be
// fully covered by flt_xx
short height;
if((flt_cc && flt_tile_sample(flt_cc, lat, lon, &height)) ||
(flt_tc && flt_tile_sample(flt_tc, lat, lon, &height)) ||
(flt_bc && flt_tile_sample(flt_bc, lat, lon, &height)) ||
(flt_cl && flt_tile_sample(flt_cl, lat, lon, &height)) ||
(flt_cr && flt_tile_sample(flt_cr, lat, lon, &height)) ||
(flt_tl && flt_tile_sample(flt_tl, lat, lon, &height)) ||
(flt_bl && flt_tile_sample(flt_bl, lat, lon, &height)) ||
(flt_tr && flt_tile_sample(flt_tr, lat, lon, &height)) ||
(flt_br && flt_tile_sample(flt_br, lat, lon, &height)))
{
short* pixels = (short*) tex->pixels;
pixels[m*SUBTILE_SIZE + n] = height;
}
else
{
short* pixels = (short*) tex->pixels;
pixels[m*SUBTILE_SIZE + n] = NEDGZ_NODATA;
}
}
}
// j=dx, i=dy
char fname[256];
snprintf(fname, 256, "%i_%i", j, i);
pak_file_writek(pak, fname);
texgz_tex_exportf(tex, pak->f);
texgz_tex_delete(&tex);
return 1;
}