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include <imhdr.h>
include <imset.h>
define MEMFUDGE 1.05
# MST_CACHE1 -- Cache 1 image in memory using the image i/o buffer sizes.
procedure mst_cache1 (cache, im, old_size)
int cache #I cache the image pixels in the imio buffer
pointer im #I the image descriptor
int old_size #O the old working set size
int i, req_size, buf_size
int sizeof(), mst_memstat()
begin
req_size = MEMFUDGE * IM_LEN(im,1) * sizeof (IM_PIXTYPE(im))
do i = 2, IM_NDIM(im)
req_size = req_size * IM_LEN(im,i)
if (mst_memstat (cache, req_size, old_size) == YES)
call mst_pcache (im, INDEFI, buf_size)
end
# MST_MEMSTAT -- Figure out if there is enough memory to cache the image
# pixels. If it is necessary to request more memory and the memory is
# avalilable return YES otherwise return NO.
int procedure mst_memstat (cache, req_size, old_size)
int cache #I cache memory ?
int req_size #I the requested working set size in chars
int old_size #O the original working set size in chars
int cur_size, max_size
int begmem()
begin
# Find the default working set size.
cur_size = begmem (0, old_size, max_size)
# If cacheing is disabled return NO regardless of the working set size.
if (cache == NO)
return (NO)
# If the requested working set size is less than the current working
# set size return YES.
if (req_size <= cur_size)
return (YES)
# Reset the current working set size.
cur_size = begmem (req_size, old_size, max_size)
if (req_size <= cur_size) {
return (YES)
} else {
return (NO)
}
end
# MST_PCACHE -- Cache the image pixels im memory by resetting the default image
# buffer size. If req_size is INDEF the size of the image is used to determine
# the size of the image i/o buffers.
procedure mst_pcache (im, req_size, buf_size)
pointer im #I the input image point
int req_size #I the requested working set size in chars
int buf_size #O the new image buffer size
int i, def_size, new_imbufsize
int sizeof(), imstati()
begin
# Find the default buffer size.
def_size = imstati (im, IM_BUFSIZE)
# Compute the new required image i/o buffer size in chars.
if (IS_INDEFI(req_size)) {
new_imbufsize = IM_LEN(im,1) * sizeof (IM_PIXTYPE(im))
do i = 2, IM_NDIM(im)
new_imbufsize = new_imbufsize * IM_LEN(im,i)
} else {
new_imbufsize = req_size
}
# If the default image i/o buffer size is already bigger than
# the requested size do nothing.
if (def_size >= new_imbufsize) {
buf_size = def_size
return
}
# Reset the image i/o buffer.
call imseti (im, IM_BUFSIZE, new_imbufsize)
call imseti (im, IM_BUFFRAC, 0)
buf_size = new_imbufsize
end
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