Hi,
find attached a patch for mod_tile.c which will then check for the layer name
and deliver a transparent tile instead of an oceantile fallback for the maplint
an caption layer if no tileset file exists.
Currently the maplint overlay is useless in many regions an in zoom < 12
because it return nontransparent fallback-tiles that completely cover the map
tiles.
A C guru might want to validate it because my c coding dates back some years ;-)
Cheers,
Martin.
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Index: mod_tah.c
===================================================================
--- mod_tah.c (revision 11183)
+++ mod_tah.c (working copy)
@@ -29,6 +29,11 @@
static char * statictilepath = "/storage/openstreetmap/tah/Tiles/";
#define OCEANS_DB_FILE "/storage/openstreetmap/tah/Tiles/oceantiles_12.dat"
+/* These layer return a transparent tile if no tileset file exists */
+const char * transparent_layers[] = {
+ "maplint",
+ "caption"
+ };
const char land[] =
"\x89\x50\x4e\x47\x0d\x0a\x1a\x0a\x00\x00\x00\x0d\x49\x48\x44\x52"
@@ -264,6 +269,15 @@
} /* serve_tileset */
+/* Checks if the layername is handled as transparent layer */
+static int is_transparent_layer( const char * layername) {
+ int i;
+ for( i=0; i < sizeof(transparent_layers)/sizeof(char*); i++)
+ if( strcmp(layername,transparent_layers[i]) == 0)
+ return 1;
+ return 0;
+}
+
static int serve_oceantile(request_rec *r, request_data* rd) {
char * fileName;
apr_status_t res;
@@ -273,7 +287,12 @@
int bit_off;
int type;
- if (rd->z < 12) {
+ if (is_transparent_layer(rd->layer)) {
+ ap_set_content_type(r, content_imagepng);
+ ap_set_content_length(r, sizeof(transparent));
+ ap_rwrite(transparent,sizeof(transparent),r);
+ return OK;
+ } else if (rd->z < 12) {
/* only available for zooms levels >= 12. */
return HTTP_NOT_FOUND;
} else {
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