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192 lines (159 sloc) 5.09 kb
#include "imager.h"
#include <stdio.h>
#include "iolayer.h"
#ifndef _MSC_VER
#include <unistd.h>
#endif
#include <string.h>
#include <errno.h>
/*
Image loader for raw files.
This is a barebones raw loader...
fd: filedescriptor
x: xsize
y: ysize
datachannels: the number of channels the file contains
storechannels: the bitmap of channels we will read
intrl: interlace flag,
0 = sample interleaving
1 = line interleaving
2 = image interleaving (not implemented)
*/
static
void
interleave(unsigned char *inbuffer,unsigned char *outbuffer,int rowsize,int channels) {
int ch,ind,i;
i=0;
if (inbuffer == outbuffer) return; /* Check if data is already in interleaved format */
for (ind=0; ind<rowsize; ind++)
for (ch=0; ch<channels; ch++)
outbuffer[i++] = inbuffer[rowsize*ch+ind];
}
static
void
expandchannels(unsigned char *inbuffer, unsigned char *outbuffer,
int xsize, int datachannels, int storechannels) {
int x, ch;
int copy_chans = storechannels > datachannels ? datachannels : storechannels;
if (inbuffer == outbuffer)
return; /* Check if data is already in expanded format */
for(x = 0; x < xsize; x++) {
for (ch = 0; ch < copy_chans; ch++)
outbuffer[x*storechannels+ch] = inbuffer[x*datachannels+ch];
for (; ch < storechannels; ch++)
outbuffer[x*storechannels+ch] = 0;
}
}
i_img *
i_readraw_wiol(io_glue *ig, int x, int y, int datachannels, int storechannels, int intrl) {
i_img* im;
int rc,k;
unsigned char *inbuffer;
unsigned char *ilbuffer;
unsigned char *exbuffer;
int inbuflen,ilbuflen,exbuflen;
i_clear_error();
io_glue_commit_types(ig);
mm_log((1, "i_readraw(ig %p,x %d,y %d,datachannels %d,storechannels %d,intrl %d)\n",
ig, x, y, datachannels, storechannels, intrl));
if (intrl != 0 && intrl != 1) {
i_push_error(0, "raw_interleave must be 0 or 1");
return NULL;
}
if (storechannels < 1 || storechannels > 4) {
i_push_error(0, "raw_storechannels must be between 1 and 4");
return NULL;
}
im = i_img_empty_ch(NULL,x,y,storechannels);
if (!im)
return NULL;
inbuflen = im->xsize*datachannels;
ilbuflen = inbuflen;
exbuflen = im->xsize*storechannels;
inbuffer = (unsigned char*)mymalloc(inbuflen);
mm_log((1,"inbuflen: %d, ilbuflen: %d, exbuflen: %d.\n",inbuflen,ilbuflen,exbuflen));
if (intrl==0) ilbuffer = inbuffer;
else ilbuffer=mymalloc(inbuflen);
if (datachannels==storechannels) exbuffer=ilbuffer;
else exbuffer= mymalloc(exbuflen);
k=0;
while( k<im->ysize ) {
rc = ig->readcb(ig, inbuffer, inbuflen);
if (rc != inbuflen) {
if (rc < 0)
i_push_error(0, "error reading file");
else
i_push_error(0, "premature end of file");
i_img_destroy(im);
myfree(inbuffer);
if (intrl != 0) myfree(ilbuffer);
if (datachannels != storechannels) myfree(exbuffer);
return NULL;
}
interleave(inbuffer,ilbuffer,im->xsize,datachannels);
expandchannels(ilbuffer,exbuffer,im->xsize,datachannels,storechannels);
/* FIXME: Do we ever want to save to a virtual image? */
memcpy(&(im->idata[im->xsize*storechannels*k]),exbuffer,exbuflen);
k++;
}
myfree(inbuffer);
if (intrl != 0) myfree(ilbuffer);
if (datachannels != storechannels) myfree(exbuffer);
i_tags_add(&im->tags, "i_format", 0, "raw", -1, 0);
return im;
}
undef_int
i_writeraw_wiol(i_img* im, io_glue *ig) {
int rc;
io_glue_commit_types(ig);
i_clear_error();
mm_log((1,"writeraw(im %p,ig %p)\n", im, ig));
if (im == NULL) { mm_log((1,"Image is empty\n")); return(0); }
if (!im->virtual) {
rc = ig->writecb(ig,im->idata,im->bytes);
if (rc != im->bytes) {
i_push_error(errno, "Could not write to file");
mm_log((1,"i_writeraw: Couldn't write to file\n"));
return(0);
}
} else {
if (im->type == i_direct_type) {
/* just save it as 8-bits, maybe support saving higher bit count
raw images later */
int line_size = im->xsize * im->channels;
unsigned char *data = mymalloc(line_size);
int y = 0;
rc = line_size;
while (rc == line_size && y < im->ysize) {
i_gsamp(im, 0, im->xsize, y, data, NULL, im->channels);
rc = ig->writecb(ig, data, line_size);
++y;
}
if (rc != line_size) {
i_push_error(errno, "write error");
return 0;
}
myfree(data);
} else {
/* paletted image - assumes the caller puts the palette somewhere
else
*/
int line_size = sizeof(i_palidx) * im->xsize;
i_palidx *data = mymalloc(sizeof(i_palidx) * im->xsize);
int y = 0;
rc = line_size;
while (rc == line_size && y < im->ysize) {
i_gpal(im, 0, im->xsize, y, data);
rc = ig->writecb(ig, data, line_size);
++y;
}
myfree(data);
if (rc != line_size) {
i_push_error(errno, "write error");
return 0;
}
}
}
ig->closecb(ig);
return(1);
}
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