rgbimgmodule.c, Makefile, config.c: new module to read RGB image files.
Does not need any SGI-specific libraries.
cgen.py, cstubs, Makefile: Generate glmodule.c differently so that it
can be compiled using an ANSI compiler.
diff --git a/Modules/rgbimgmodule.c b/Modules/rgbimgmodule.c
new file mode 100644
index 0000000..663a460
--- /dev/null
+++ b/Modules/rgbimgmodule.c
@@ -0,0 +1,712 @@
+/*
+ * 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"
+#include <unistd.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();
+static setalpha();
+static copybw();
+static interleaverow();
+static int compressrow();
+static lumrow();
+
+#ifdef ADD_TAGS
+#define TAGLEN (5)
+#else
+#define TAGLEN (0)
+#endif
+
+static object *ImgfileError;
+
+#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;
+{
+ bzero(image,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;
+
+ bzero(&t,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 long *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 long *) getstringvalue(rv);
+#ifdef ADD_TAGS
+ addlongimgtag(base,xsize,ysize);
+#endif
+ if(badorder) {
+ for(z=0; z<zsize; z++) {
+ lptr = base;
+ 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);
+ lptr += xsize;
+ }
+ }
+ } else {
+ lptr = base;
+ 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);
+ }
+ lptr += xsize;
+ }
+ }
+ if(zsize == 3)
+ setalpha(base,xsize*ysize);
+ else if(zsize<3)
+ copybw(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 long *) 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;
+ for(y=0; y<ysize; y++) {
+ fread(verdat,xsize,1,inf);
+ interleaverow(lptr,verdat,3-z,xsize);
+ lptr += xsize;
+ }
+ }
+ if(zsize == 3)
+ setalpha(base,xsize*ysize);
+ else if(zsize<3)
+ copybw(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 long *lptr;
+ char *name;
+ int xsize, ysize, zsize;
+ FILE *outf;
+ IMAGE image;
+ int tablen, y, z, pos, len;
+ long *starttab, *lengthtab;
+ unsigned char *rlebuf;
+ unsigned long *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 long *)malloc(xsize*sizeof(long));
+
+ bzero(&image,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;
+ 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;
+ }
+ lptr += xsize;
+ }
+
+ 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 struct methodlist rgbimg_methods[] = {
+ {"sizeofimage", sizeofimage},
+ {"longimagedata", longimagedata},
+ {"longstoimage", longstoimage},
+ {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");
+}