+// Remove attributes
+bool wxRichTextRemoveStyle(wxTextAttrEx& destStyle, const wxRichTextAttr& style)
+{
+ int flags = style.GetFlags();
+ int destFlags = destStyle.GetFlags();
+
+ destStyle.SetFlags(destFlags & ~flags);
+
+ return true;
+}
+
+/// Combine two bitlists, specifying the bits of interest with separate flags.
+bool wxRichTextCombineBitlists(int& valueA, int valueB, int& flagsA, int flagsB)
+{
+ // We want to apply B's bits to A, taking into account each's flags which indicate which bits
+ // are to be taken into account. A zero in B's bits should reset that bit in A but only if B's flags
+ // indicate it.
+
+ // First, reset the 0 bits from B. We make a mask so we're only dealing with B's zero
+ // bits at this point, ignoring any 1 bits in B or 0 bits in B that are not relevant.
+ int valueA2 = ~(~valueB & flagsB) & valueA;
+
+ // Now combine the 1 bits.
+ int valueA3 = (valueB & flagsB) | valueA2;
+
+ valueA = valueA3;
+ flagsA = (flagsA | flagsB);
+
+ return true;
+}
+
+/// Compare two bitlists
+bool wxRichTextBitlistsEqPartial(int valueA, int valueB, int flags)
+{
+ int relevantBitsA = valueA & flags;
+ int relevantBitsB = valueB & flags;
+ return (relevantBitsA != relevantBitsB);
+}
+