=> R0 = operation flags
R1 = pointer to JPEG file name
<= R0 = info flags
R2 = width (in pixels) if requested
R3 = height (in pixels) if requested
R4 = x pixel density
R5 = y pixel density
R6 = extra workspace that would be required to plot (0=none)
This SWI returns information about a JPEG held in a file. It checks the header enough to return the width and height, and does a partial validation of the data. It returns an error if the image appears to be invalid; if no error is returned you may assume the data is a JPEG image.
It is preferable to load the file into memory and call JPEG_Info, if you intend to display the image as well.
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