Fix font glyph overlaps

3 files changed, 12 insertions, 0 deletions

diff --git a/depends/mgl b/depends/mgl
-Subproject ccd0e65a0ddccd9c52d4c075ec1cad41ae7edb4
+Subproject c18f87ad13da518af5ff245dbce2a9e608097ea
diff --git a/include/mglpp/system/Utf8.hpp b/include/mglpp/system/Utf8.hpp
index 4f6a39a..ba1b90e 100644
--- a/include/mglpp/system/Utf8.hpp
+++ b/include/mglpp/system/Utf8.hpp
@@ -5,7 +5,15 @@
 #include <stdint.h>
 
 namespace mgl {
+    // Returns false on failure. |decoded_codepoint| is set to |str[0]| if size > 0 and |codepoint_length| is set to 1
     bool utf8_decode(const unsigned char *str, size_t size, uint32_t *decoded_codepoint, size_t *codepoint_length);
+    /*
+        |str| should be the start of the utf8 string and |size| is the size of the string.
+        Returns the index of the start of the codepoint that starts at or before |offset|,
+        or if the string contains invalid utf8 then the index to the invalid character is returned.
+        Returns 0 if start of codepoint is not found.
+    */
+    size_t utf8_get_start_of_codepoint(const unsigned char *str, size_t size, size_t offset);
 }
 
 #endif /* MGLPP_UTF8_HPP */
diff --git a/src/system/Utf8.cpp b/src/system/Utf8.cpp
index be9b2af..a416477 100644
--- a/src/system/Utf8.cpp
+++ b/src/system/Utf8.cpp
@@ -8,4 +8,8 @@ namespace mgl {
     bool utf8_decode(const unsigned char *str, size_t size, uint32_t *decoded_codepoint, size_t *codepoint_length) {
         return mgl_utf8_decode(str, size, decoded_codepoint, codepoint_length);
     }
+
+    size_t utf8_get_start_of_codepoint(const unsigned char *str, size_t size, size_t offset) {
+        return mgl_utf8_get_start_of_codepoint(str, size, offset);
+    }
 }
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