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lib/raster: read vrt tile only if needed #7334

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lib/raster: read vrt tile only if needed #7334

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22 changes: 21 additions & 1 deletion lib/raster/vrt.c
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Original file line number Diff line number Diff line change
Expand Up @@ -205,8 +205,28 @@ int Rast_get_vrt_row(int fd, void *buf, int row, RASTER_MAP_TYPE data_type)
#pragma omp critical(raster_vrt_read)
for (i = 0; i < vrt->tlist->n_values; i++) {
struct tileinfo *p = &ti[vrt->tlist->value[i]];
double tile_west, tile_east;

if (p->cellhd.north > rows && p->cellhd.south <= rown) {
tile_west = p->cellhd.west;
tile_east = p->cellhd.east;

if (R__.rd_window.proj == PROJECTION_LL) {
/* longitude wrapping of the tile into the current
* reading window */
while (tile_west > rd_window->east) {
tile_west -= 360.0;
tile_east -= 360.0;
}
while (tile_east < rd_window->west) {
tile_west += 360.0;
tile_east += 360.0;
}
}

/* open the tile only if it overlaps with the current reading
* row and the current reading EW extents */
if (p->cellhd.north > rows && p->cellhd.south <= rown &&
tile_west < p->cellhd.east && tile_east > p->cellhd.west) {
int tfd;
void *p1, *p2;

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