buffer_relative_character_from_pos
January 19th 2020
Compute a character index relative to a particular lines first character
Signature
i64
buffer_relative_character_from_pos(Application_Links* app,
Buffer_ID buffer_id,
f32 width,
Face_ID face_id,
i64 base_line,
i64 pos);Parameters
app
the standard custom layer context pointer
buffer_id
the id of the buffer who's layout will be measured
width
the width parameter of the layout, passed to layout rules as a recommended wrap point
face_id
the face parameter of the layout, passed to layout rules as a recommended face
base_line
the line number of the line that serves as the relative starting point of the measurement
pos
the absolute byte index of the position to query
Return
the relative index, based at the first character of the base line, of the character that is closest to spanning the query position on success, when the buffer exists and contains the base line and query position, zero otherwise
Details
Line numbers are 1 based.