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-rw-r--r--emcc.c3
-rw-r--r--emcclib.js11
2 files changed, 14 insertions, 0 deletions
diff --git a/emcc.c b/emcc.c
index 98d5cea..1d88bfd 100644
--- a/emcc.c
+++ b/emcc.c
@@ -51,6 +51,7 @@ extern void js_add_preset(int menuid, const char *name, int value);
extern int js_add_preset_submenu(int menuid, const char *name);
extern int js_get_selected_preset(void);
extern void js_select_preset(int n);
+extern void js_set_background_colour(const char *bg);
extern void js_get_date_64(unsigned *p);
extern void js_update_permalinks(const char *desc, const char *seed);
extern void js_enable_undo_redo(bool undo, bool redo);
@@ -1007,6 +1008,8 @@ int main(int argc, char **argv)
(unsigned)(0.5 + 255 * colours[i*3+2]));
colour_strings[i] = dupstr(col);
}
+ /* Put the background colour in a CSS variable. */
+ js_set_background_colour(colour_strings[0]);
/*
* Request notification when the game ids change (e.g. if the user
diff --git a/emcclib.js b/emcclib.js
index 3824293..814ff56 100644
--- a/emcclib.js
+++ b/emcclib.js
@@ -144,6 +144,17 @@ mergeInto(LibraryManager.library, {
},
/*
+ * void js_set_background_colour(const char *bg);
+ *
+ * Record the puzzle background colour in a CSS variable so
+ * the style sheet can use it if it wants.
+ */
+ js_set_background_colour: function(bgptr) {
+ document.documentElement.style.setProperty("--puzzle-background",
+ UTF8ToString(bgptr));
+ },
+
+ /*
* void js_get_date_64(unsigned *p);
*
* Return the current date, in milliseconds since the epoch