im_writeline3
Writes a line of data in the image descriptor
Usage
#include <vips/vips.h>
int im_writeline(ypos, image, buffer)
int ypos;
IMAGE *image;
char *buffer;
Overview
im_writeline(3) writes the ypos line of an image held in buffer to either the output buffer image (previously set by im_setbuf(3)) or to an output file (previously set by im_openput(3)). The function provides uniform treatment of output irrespectively whether it is a file or a buffer image.
You should be careful that the buffer does indeed contain enough data for a complete line of pels --- see lsize(3).
Any evaluation callbacks which have been added to image are triggered --- see im_generate(3) and im_add_eval_callback(3).
Return value
The function returns 0 on success and -1 on error.
Releases
Unchanged in 4 releases since Debian 3.1 (Sarge).