Attempt to fix font glyph texture overlap by aligning texture size to

next character size

Add function to get the start of a utf8 codepoint (backwards), test utf8
functions

2 files changed, 8 insertions, 1 deletions

diff --git a/include/mgl/graphics/font.h b/include/mgl/graphics/font.h
index adcc8a7..6b7eb34 100644
--- a/include/mgl/graphics/font.h
+++ b/include/mgl/graphics/font.h
@@ -25,7 +25,7 @@ typedef struct {
 } mgl_font_atlas;
 
 struct mgl_font {
-    mgl_texture texture;
+    mgl_texture texture; /* Font texture coordinates are in pixel space */
     mgl_font_atlas font_atlas;
     unsigned int character_size;
     mgl_font_char_map char_map;
diff --git a/include/mgl/system/utf8.h b/include/mgl/system/utf8.h
index 7120f1a..794884d 100644
--- a/include/mgl/system/utf8.h
+++ b/include/mgl/system/utf8.h
@@ -9,6 +9,13 @@
     Returns false on failure. |decoded_codepoint| is set to |str[0]| if size > 0 and |codepoint_length| is set to 1
 */
 bool mgl_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 mgl_utf8_get_start_of_codepoint(const unsigned char *str, size_t size, size_t offset);
 
 #endif /* MGL_UTF8_H */