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 void sample_data(texgz_tex_t* src,
texgz_tex_t* dst,
int x, int y,
int m, int n,
double latT, double lonL,
double latB, double lonR)
{
assert(src);
assert(dst);
// compute sample coords
double lat;
double lon;
float s = (float) (SUBTILE_SIZE - 1);
float xx = (float) x;
float yy = (float) y;
float nn = (float) n/s;
float mm = (float) m/s;
terrain_tile2coord(xx + nn, yy + mm, 9, &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;
}
