Constructs a "data:" URI (of form "data:mime type;base64encoded_data").
The mime_type neither the charset cannot contain ',' nor ';',
| mime_type |
optional MIME type to use, or null |
| charset |
optional charset to use, or null |
| is_base64 |
true, when the |
| data |
actual data |
|
a newly allocated "data:" URI constructed from the provided arguments. Free it with g_free, when no longer needed. |