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_tile(int x, int y, int zoom)
{
LOGD("debug x=%i, y=%i, zoom=%i", x, y, zoom);
nedgz_tile_t* tile = nedgz_tile_new(x, y, zoom);
if(tile == NULL)
{
return 0;
}
// sample subtiles i,j
int j;
int i;
for(i = 0; i < NEDGZ_SUBTILE_COUNT; ++i)
{
for(j = 0; j < NEDGZ_SUBTILE_COUNT; ++j)
{
if(sample_subtile(tile, i, j) == 0)
{
goto fail_sample;
}
}
}
if(nedgz_tile_export(tile, "ned") == 0)
{
goto fail_export;
}
nedgz_tile_delete(&tile);
// success
return 1;
// failure
fail_export:
fail_sample:
nedgz_tile_delete(&tile);
return 0;
}
static int sample_tile(int x, int y, int zoom)
{
LOGD("debug x=%i, y=%i, zoom=%i", x, y, zoom);
// create directories if necessary
char dname[256];
snprintf(dname, 256, "heightmap/%i", zoom);
if(mkdir(dname, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH) == -1)
{
if(errno == EEXIST)
{
// already exists
}
else
{
LOGE("mkdir %s failed", dname);
return 0;
}
}
nedgz_tile_t* tile = nedgz_tile_new(x, y, zoom);
if(tile == NULL)
{
return 0;
}
char fname[256];
snprintf(fname, 256, "heightmap/%i/%i_%i.pak", zoom, x, y);
pak_file_t* pak = pak_file_open(fname, PAK_FLAG_WRITE);
if(pak == NULL)
{
goto fail_pak;
}
// sample subtiles i,j
int j;
int i;
for(i = 0; i < NEDGZ_SUBTILE_COUNT; ++i)
{
for(j = 0; j < NEDGZ_SUBTILE_COUNT; ++j)
{
if(sample_subtile(tile, i, j, pak) == 0)
{
goto fail_sample;
}
}
}
pak_file_close(&pak);
nedgz_tile_delete(&tile);
// success
return 1;
// failure
fail_sample:
pak_file_close(&pak);
fail_pak:
nedgz_tile_delete(&tile);
return 0;
}
