A callback function that copies data from the provider into a Core Graphics buffer.
- Core Graphics
A generic pointer to private data shared among your callback functions. This is the same pointer you supplied to
Provider Create Direct Access
The Core Graphics buffer into which you copy the specified number of bytes.
Specifies the relative location in the data provider at which to begin copying data.
The number of bytes to copy.
The number of bytes copied. If no more data can be written to the buffer, you should return 0.