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cpython/Modules/rgbimgmodule.c

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/*
* fastimg -
* Faster reading and writing of image files.
*
* This code should work on machines with any byte order.
*
* Could someone make this run real fast using multiple processors
* or how about using memory mapped files to speed it up?
*
* Paul Haeberli - 1991
*
* Changed to return sizes.
* Sjoerd Mullender - 1993
* Changed to incorporate into Python.
* Sjoerd Mullender - 1993
*/
#include "allobjects.h"
#include "modsupport.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
/*
* from image.h
*
*/
typedef struct {
unsigned short imagic; /* stuff saved on disk . . */
unsigned short type;
unsigned short dim;
unsigned short xsize;
unsigned short ysize;
unsigned short zsize;
unsigned long min;
unsigned long max;
unsigned long wastebytes;
char name[80];
unsigned long colormap;
long file; /* stuff used in core only */
unsigned short flags;
short dorev;
short x;
short y;
short z;
short cnt;
unsigned short *ptr;
unsigned short *base;
unsigned short *tmpbuf;
unsigned long offset;
unsigned long rleend; /* for rle images */
unsigned long *rowstart; /* for rle images */
long *rowsize; /* for rle images */
} IMAGE;
#define IMAGIC 0732
#define TYPEMASK 0xff00
#define BPPMASK 0x00ff
#define ITYPE_VERBATIM 0x0000
#define ITYPE_RLE 0x0100
#define ISRLE(type) (((type) & 0xff00) == ITYPE_RLE)
#define ISVERBATIM(type) (((type) & 0xff00) == ITYPE_VERBATIM)
#define BPP(type) ((type) & BPPMASK)
#define RLE(bpp) (ITYPE_RLE | (bpp))
#define VERBATIM(bpp) (ITYPE_VERBATIM | (bpp))
/*
* end of image.h stuff
*
*/
#define RINTLUM (79)
#define GINTLUM (156)
#define BINTLUM (21)
#define ILUM(r,g,b) ((int)(RINTLUM*(r)+GINTLUM*(g)+BINTLUM*(b))>>8)
#define OFFSET_R 3 /* this is byte order dependent */
#define OFFSET_G 2
#define OFFSET_B 1
#define OFFSET_A 0
#define CHANOFFSET(z) (3-(z)) /* this is byte order dependent */
static expandrow PROTO((unsigned char *, unsigned char *, int));
static setalpha PROTO((unsigned char *, int));
static copybw PROTO((long *, int));
static interleaverow PROTO((unsigned char *, unsigned char *, int, int));
static int compressrow PROTO((unsigned char *, unsigned char *, int, int));
static lumrow PROTO((unsigned char *, unsigned char *, int));
#ifdef ADD_TAGS
#define TAGLEN (5)
#else
#define TAGLEN (0)
#endif
static object *ImgfileError;
static int reverse_order;
#ifdef ADD_TAGS
/*
* addlongimgtag -
* this is used to extract image data from core dumps.
*
*/
addlongimgtag(dptr,xsize,ysize)
unsigned long *dptr;
int xsize, ysize;
{
dptr = dptr+(xsize*ysize);
dptr[0] = 0x12345678;
dptr[1] = 0x59493333;
dptr[2] = 0x69434222;
dptr[3] = xsize;
dptr[4] = ysize;
}
#endif
/*
* byte order independent read/write of shorts and longs.
*
*/
static unsigned short getshort(inf)
FILE *inf;
{
unsigned char buf[2];
fread(buf,2,1,inf);
return (buf[0]<<8)+(buf[1]<<0);
}
static unsigned long getlong(inf)
FILE *inf;
{
unsigned char buf[4];
fread(buf,4,1,inf);
return (buf[0]<<24)+(buf[1]<<16)+(buf[2]<<8)+(buf[3]<<0);
}
static putshort(outf,val)
FILE *outf;
unsigned short val;
{
unsigned char buf[2];
buf[0] = (val>>8);
buf[1] = (val>>0);
fwrite(buf,2,1,outf);
}
static int putlong(outf,val)
FILE *outf;
unsigned long val;
{
unsigned char buf[4];
buf[0] = (val>>24);
buf[1] = (val>>16);
buf[2] = (val>>8);
buf[3] = (val>>0);
return fwrite(buf,4,1,outf);
}
static readheader(inf,image)
FILE *inf;
IMAGE *image;
{
memset(image,0,sizeof(IMAGE));
image->imagic = getshort(inf);
image->type = getshort(inf);
image->dim = getshort(inf);
image->xsize = getshort(inf);
image->ysize = getshort(inf);
image->zsize = getshort(inf);
}
static int writeheader(outf,image)
FILE *outf;
IMAGE *image;
{
IMAGE t;
memset(&t,0,sizeof(IMAGE));
fwrite(&t,sizeof(IMAGE),1,outf);
fseek(outf,0,SEEK_SET);
putshort(outf,image->imagic);
putshort(outf,image->type);
putshort(outf,image->dim);
putshort(outf,image->xsize);
putshort(outf,image->ysize);
putshort(outf,image->zsize);
putlong(outf,image->min);
putlong(outf,image->max);
putlong(outf,0);
return fwrite("no name",8,1,outf);
}
static int writetab(outf,tab,len)
FILE *outf;
/*unsigned*/ long *tab;
int len;
{
int r;
while(len) {
r = putlong(outf,*tab++);
len -= 4;
}
return r;
}
static readtab(inf,tab,len)
FILE *inf;
/*unsigned*/ long *tab;
int len;
{
while(len) {
*tab++ = getlong(inf);
len -= 4;
}
}
/*
* sizeofimage -
* return the xsize and ysize of an iris image file.
*
*/
static object *
sizeofimage(self, args)
object *self, *args;
{
char *name;
IMAGE image;
FILE *inf;
if (!getargs(args, "s", &name))
return NULL;
inf = fopen(name,"r");
if(!inf) {
err_setstr(ImgfileError, "can't open image file");
return NULL;
}
readheader(inf,&image);
fclose(inf);
if(image.imagic != IMAGIC) {
err_setstr(ImgfileError, "bad magic number in image file");
return NULL;
}
return mkvalue("(ii)", image.xsize, image.ysize);
}
/*
* longimagedata -
* read in a B/W RGB or RGBA iris image file and return a
* pointer to an array of longs.
*
*/
static object *
longimagedata(self, args)
object *self, *args;
{
char *name;
unsigned char *base, *lptr;
unsigned char *rledat, *verdat;
long *starttab, *lengthtab;
FILE *inf;
IMAGE image;
int y, z, pos, len, tablen;
int xsize, ysize, zsize;
int bpp, rle, cur, badorder;
int rlebuflen;
object *rv;
if (!getargs(args, "s", &name))
return NULL;
inf = fopen(name,"r");
if(!inf) {
err_setstr(ImgfileError,"can't open image file");
return NULL;
}
readheader(inf,&image);
if(image.imagic != IMAGIC) {
err_setstr(ImgfileError,"bad magic number in image file");
fclose(inf);
return NULL;
}
rle = ISRLE(image.type);
bpp = BPP(image.type);
if(bpp != 1 ) {
err_setstr(ImgfileError,"image must have 1 byte per pix chan");
fclose(inf);
return NULL;
}
xsize = image.xsize;
ysize = image.ysize;
zsize = image.zsize;
if(rle) {
tablen = ysize*zsize*sizeof(long);
starttab = (long *)malloc(tablen);
lengthtab = (long *)malloc(tablen);
rlebuflen = 1.05*xsize+10;
rledat = (unsigned char *)malloc(rlebuflen);
fseek(inf,512,SEEK_SET);
readtab(inf,starttab,tablen);
readtab(inf,lengthtab,tablen);
/* check data order */
cur = 0;
badorder = 0;
for(y=0; y<ysize; y++) {
for(z=0; z<zsize; z++) {
if(starttab[y+z*ysize]<cur) {
badorder = 1;
break;
}
cur = starttab[y+z*ysize];
}
if(badorder)
break;
}
fseek(inf,512+2*tablen,SEEK_SET);
cur = 512+2*tablen;
rv = newsizedstringobject((char *) 0,
(xsize*ysize+TAGLEN)*sizeof(long));
if (rv == NULL) {
fclose(inf);
free(lengthtab);
free(starttab);
free(rledat);
return NULL;
}
base = (unsigned char *) getstringvalue(rv);
#ifdef ADD_TAGS
addlongimgtag(base,xsize,ysize);
#endif
if(badorder) {
for(z=0; z<zsize; z++) {
lptr = base;
if (reverse_order)
lptr += (ysize - 1) * xsize * sizeof(unsigned long);
for(y=0; y<ysize; y++) {
if(cur != starttab[y+z*ysize]) {
fseek(inf,starttab[y+z*ysize],SEEK_SET);
cur = starttab[y+z*ysize];
}
if(lengthtab[y+z*ysize]>rlebuflen) {
err_setstr(ImgfileError,"rlebuf is too small - bad poop");
fclose(inf);
DECREF(rv);
free(rledat);
free(starttab);
free(lengthtab);
return NULL;
}
fread(rledat,lengthtab[y+z*ysize],1,inf);
cur += lengthtab[y+z*ysize];
expandrow(lptr,rledat,3-z);
if (reverse_order)
lptr -= xsize * sizeof(unsigned long);
else
lptr += xsize * sizeof(unsigned long);
}
}
} else {
lptr = base;
if (reverse_order)
lptr += (ysize - 1) * xsize * sizeof(unsigned long);
for(y=0; y<ysize; y++) {
for(z=0; z<zsize; z++) {
if(cur != starttab[y+z*ysize]) {
fseek(inf,starttab[y+z*ysize],SEEK_SET);
cur = starttab[y+z*ysize];
}
fread(rledat,lengthtab[y+z*ysize],1,inf);
cur += lengthtab[y+z*ysize];
expandrow(lptr,rledat,3-z);
}
if (reverse_order)
lptr -= xsize * sizeof(unsigned long);
else
lptr += xsize * sizeof(unsigned long);
}
}
if(zsize == 3)
setalpha(base,xsize*ysize);
else if(zsize<3)
copybw((long *) base,xsize*ysize);
fclose(inf);
free(starttab);
free(lengthtab);
free(rledat);
return rv;
} else {
rv = newsizedstringobject((char *) 0,
(xsize*ysize+TAGLEN)*sizeof(long));
if (rv == NULL) {
fclose(inf);
return NULL;
}
base = (unsigned char *) getstringvalue(rv);
#ifdef ADD_TAGS
addlongimgtag(base,xsize,ysize);
#endif
verdat = (unsigned char *)malloc(xsize);
fseek(inf,512,SEEK_SET);
for(z=0; z<zsize; z++) {
lptr = base;
if (reverse_order)
lptr += (ysize - 1) * xsize * sizeof(unsigned long);
for(y=0; y<ysize; y++) {
fread(verdat,xsize,1,inf);
interleaverow(lptr,verdat,3-z,xsize);
if (reverse_order)
lptr -= xsize * sizeof(unsigned long);
else
lptr += xsize * sizeof(unsigned long);
}
}
if(zsize == 3)
setalpha(base,xsize*ysize);
else if(zsize<3)
copybw((long *) base,xsize*ysize);
fclose(inf);
free(verdat);
return rv;
}
}
/* static utility functions for longimagedata */
static interleaverow(lptr,cptr,z,n)
unsigned char *lptr, *cptr;
int z, n;
{
lptr += z;
while(n--) {
*lptr = *cptr++;
lptr += 4;
}
}
static copybw(lptr,n)
long *lptr;
int n;
{
while(n>=8) {
lptr[0] = 0xff000000+(0x010101*(lptr[0]&0xff));
lptr[1] = 0xff000000+(0x010101*(lptr[1]&0xff));
lptr[2] = 0xff000000+(0x010101*(lptr[2]&0xff));
lptr[3] = 0xff000000+(0x010101*(lptr[3]&0xff));
lptr[4] = 0xff000000+(0x010101*(lptr[4]&0xff));
lptr[5] = 0xff000000+(0x010101*(lptr[5]&0xff));
lptr[6] = 0xff000000+(0x010101*(lptr[6]&0xff));
lptr[7] = 0xff000000+(0x010101*(lptr[7]&0xff));
lptr += 8;
n-=8;
}
while(n--) {
*lptr = 0xff000000+(0x010101*(*lptr&0xff));
lptr++;
}
}
static setalpha(lptr,n)
unsigned char *lptr;
{
while(n>=8) {
lptr[0*4] = 0xff;
lptr[1*4] = 0xff;
lptr[2*4] = 0xff;
lptr[3*4] = 0xff;
lptr[4*4] = 0xff;
lptr[5*4] = 0xff;
lptr[6*4] = 0xff;
lptr[7*4] = 0xff;
lptr += 4*8;
n -= 8;
}
while(n--) {
*lptr = 0xff;
lptr += 4;
}
}
static expandrow(optr,iptr,z)
unsigned char *optr, *iptr;
int z;
{
unsigned char pixel, count;
optr += z;
while(1) {
pixel = *iptr++;
if ( !(count = (pixel & 0x7f)) )
return;
if(pixel & 0x80) {
while(count>=8) {
optr[0*4] = iptr[0];
optr[1*4] = iptr[1];
optr[2*4] = iptr[2];
optr[3*4] = iptr[3];
optr[4*4] = iptr[4];
optr[5*4] = iptr[5];
optr[6*4] = iptr[6];
optr[7*4] = iptr[7];
optr += 8*4;
iptr += 8;
count -= 8;
}
while(count--) {
*optr = *iptr++;
optr+=4;
}
} else {
pixel = *iptr++;
while(count>=8) {
optr[0*4] = pixel;
optr[1*4] = pixel;
optr[2*4] = pixel;
optr[3*4] = pixel;
optr[4*4] = pixel;
optr[5*4] = pixel;
optr[6*4] = pixel;
optr[7*4] = pixel;
optr += 8*4;
count -= 8;
}
while(count--) {
*optr = pixel;
optr+=4;
}
}
}
}
/*
* longstoimage -
* copy an array of longs to an iris image file. Each long
* represents one pixel. xsize and ysize specify the dimensions of
* the pixel array. zsize specifies what kind of image file to
* write out. if zsize is 1, the luminance of the pixels are
* calculated, and a sinlge channel black and white image is saved.
* If zsize is 3, an RGB image file is saved. If zsize is 4, an
* RGBA image file is saved.
*
*/
static object *
longstoimage(self, args)
object *self, *args;
{
unsigned char *lptr;
char *name;
int xsize, ysize, zsize;
FILE *outf;
IMAGE image;
int tablen, y, z, pos, len;
long *starttab, *lengthtab;
unsigned char *rlebuf;
unsigned char *lumbuf;
int rlebuflen, goodwrite;
if (!getargs(args, "(s#iiis)", &lptr, &len, &xsize, &ysize, &zsize, &name))
return NULL;
goodwrite = 1;
outf = fopen(name,"w");
if(!outf) {
err_setstr(ImgfileError,"can't open output file");
return NULL;
}
tablen = ysize*zsize*sizeof(long);
starttab = (long *)malloc(tablen);
lengthtab = (long *)malloc(tablen);
rlebuflen = 1.05*xsize+10;
rlebuf = (unsigned char *)malloc(rlebuflen);
lumbuf = (unsigned char *)malloc(xsize*sizeof(long));
memset(&image,0,sizeof(IMAGE));
image.imagic = IMAGIC;
image.type = RLE(1);
if(zsize>1)
image.dim = 3;
else
image.dim = 2;
image.xsize = xsize;
image.ysize = ysize;
image.zsize = zsize;
image.min = 0;
image.max = 255;
goodwrite *= writeheader(outf,&image);
fseek(outf,512+2*tablen,SEEK_SET);
pos = 512+2*tablen;
if (reverse_order)
lptr += (ysize - 1) * xsize * sizeof(unsigned long);
for(y=0; y<ysize; y++) {
for(z=0; z<zsize; z++) {
if(zsize == 1) {
lumrow(lptr,lumbuf,xsize);
len = compressrow(lumbuf,rlebuf,CHANOFFSET(z),xsize);
} else {
len = compressrow(lptr,rlebuf,CHANOFFSET(z),xsize);
}
if(len>rlebuflen) {
err_setstr(ImgfileError,"rlebuf is too small - bad poop");
free(starttab);
free(lengthtab);
free(rlebuf);
free(lumbuf);
fclose(outf);
return NULL;
}
goodwrite *= fwrite(rlebuf,len,1,outf);
starttab[y+z*ysize] = pos;
lengthtab[y+z*ysize] = len;
pos += len;
}
if (reverse_order)
lptr -= xsize * sizeof(unsigned long);
else
lptr += xsize * sizeof(unsigned long);
}
fseek(outf,512,SEEK_SET);
goodwrite *= writetab(outf,starttab,tablen);
goodwrite *= writetab(outf,lengthtab,tablen);
free(starttab);
free(lengthtab);
free(rlebuf);
free(lumbuf);
fclose(outf);
if(goodwrite) {
INCREF(None);
return None;
} else {
err_setstr(ImgfileError,"not enough space for image!!");
return NULL;
}
}
/* static utility functions for longstoimage */
static lumrow(rgbptr,lumptr,n)
unsigned char *rgbptr, *lumptr;
int n;
{
lumptr += CHANOFFSET(0);
while(n--) {
*lumptr = ILUM(rgbptr[OFFSET_R],rgbptr[OFFSET_G],rgbptr[OFFSET_B]);
lumptr += 4;
rgbptr += 4;
}
}
static int compressrow(lbuf,rlebuf,z,cnt)
unsigned char *lbuf, *rlebuf;
int z, cnt;
{
unsigned char *iptr, *ibufend, *sptr, *optr;
short todo, cc;
long count;
lbuf += z;
iptr = lbuf;
ibufend = iptr+cnt*4;
optr = rlebuf;
while(iptr<ibufend) {
sptr = iptr;
iptr += 8;
while((iptr<ibufend)&& ((iptr[-8]!=iptr[-4])||(iptr[-4]!=iptr[0])))
iptr+=4;
iptr -= 8;
count = (iptr-sptr)/4;
while(count) {
todo = count>126 ? 126:count;
count -= todo;
*optr++ = 0x80|todo;
while(todo>8) {
optr[0] = sptr[0*4];
optr[1] = sptr[1*4];
optr[2] = sptr[2*4];
optr[3] = sptr[3*4];
optr[4] = sptr[4*4];
optr[5] = sptr[5*4];
optr[6] = sptr[6*4];
optr[7] = sptr[7*4];
optr += 8;
sptr += 8*4;
todo -= 8;
}
while(todo--) {
*optr++ = *sptr;
sptr += 4;
}
}
sptr = iptr;
cc = *iptr;
iptr += 4;
while( (iptr<ibufend) && (*iptr == cc) )
iptr += 4;
count = (iptr-sptr)/4;
while(count) {
todo = count>126 ? 126:count;
count -= todo;
*optr++ = todo;
*optr++ = cc;
}
}
*optr++ = 0;
return optr - (unsigned char *)rlebuf;
}
static object *
ttob(self, args)
object *self;
object *args;
{
int order, oldorder;
if (!getargs(args, "i", &order))
return NULL;
oldorder = reverse_order;
reverse_order = order;
return newintobject(oldorder);
}
static struct methodlist rgbimg_methods[] = {
{"sizeofimage", sizeofimage},
{"longimagedata", longimagedata},
{"longstoimage", longstoimage},
{"ttob", ttob},
{NULL, NULL} /* sentinel */
};
void
initrgbimg()
{
object *m, *d;
m = initmodule("rgbimg", rgbimg_methods);
d = getmoduledict(m);
ImgfileError = newstringobject("rgbimg.error");
if (ImgfileError == NULL || dictinsert(d, "error", ImgfileError))
fatal("can't define rgbimg.error");
}
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