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grdimage: issue in map tiling with oblique projection #9041

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joa-quim merged 1 commit into from
May 26, 2026
+17 −0
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grdimage: issue in map tiling with oblique projection #9041

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17 changes: 17 additions & 0 deletions src/gmt_init.c
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Original file line number Diff line number Diff line change
Expand Up @@ -16471,6 +16471,23 @@ dry_run: if (opt_R == NULL) { /* In this context we imply -Rd unless grdcut -S
API->GMT->hidden.func_level++; /* Must do this here in case gmt_parse_R_option calls mapproject */
if (!parsed_R) gmt_parse_R_option (GMT, opt_R->arg);
API->GMT->hidden.func_level = level; /* Reset to what it should be */
/* Issue #6463: If -R<x>/<x>/<y>/<y>+u<unit> was given, rewrite opt_R->arg to the equivalent
* geographic LL/UR form -R<LL_lon>/<LL_lat>/<UR_lon>/<UR_lat>+r. The +u parsing path invokes
* mapproject as a sub-module to invert projected coords; a second invocation (during the
* module's own GMT_Parse_Common) inherits the parent's now-populated current.proj and yields
* a wrong inverse. The +r path needs no sub-mapproject call so it is immune. R.wesn already
* holds the correct LL/UR corners at this point. */
if (!parsed_R && GMT->common.R.oblique) {
char *u_pos = strstr(opt_R->arg, "+u");
if (u_pos && strchr(GMT_LEN_UNITS2, u_pos[2])) {
char new_arg[GMT_LEN256] = {""}, *rest = u_pos + 3; /* Skip past "+u<unit>" */
snprintf(new_arg, GMT_LEN256, "%.16g/%.16g/%.16g/%.16g+r%s", GMT->common.R.wesn[XLO], GMT->common.R.wesn[YLO],
GMT->common.R.wesn[XHI], GMT->common.R.wesn[YHI], rest);
GMT_Report(API, GMT_MSG_DEBUG, "Replace -R%s with -R%s to avoid projection-dependent re-parse [#6463]\n", opt_R->arg, new_arg);
gmt_M_str_free(opt_R->arg);
opt_R->arg = strdup(new_arg);
}
}
if (GMT->common.R.oblique || GMT->current.proj.projection == GMT_OBLIQUE_MERC || GMT->current.proj.projection == GMT_GENPER) {
int s_error = GMT_NOERROR; /* Error code for various calls */
const char *prev_name = GMT->init.module_name; /* Remember calling module */
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