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added readscaled() function.

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This commit is contained in:
Guido van Rossum 1992-06-03 17:06:36 +00:00
parent 9c52e0ff32
commit 2c4be64f20
1 changed files with 86 additions and 11 deletions
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97
Modules/imgfile.c
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@ -24,7 +24,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
/* IMGFILE module - Interface to sgi libimg */
/*XXXX This modele should be done better at some point. It should return
/* XXX This modele should be done better at some point. It should return
** an object of image file class, and have routines to manipulate these
** image files in a neater way (so you can get rgb images off a greyscale
** file, for instance, or do a straight display without having to get the
@ -54,13 +54,9 @@ static imgfile_error(str)
}
static
imgfile_open(args)
object *args;
{
imgfile_open(fname)
char *fname;
if ( !getargs(args, "s", &fname) )
return 0;
{
i_seterror(imgfile_error);
error_called = 0;
if ( image != NULL && strcmp(fname, gfname) != 0 ) {
@ -91,7 +87,10 @@ imgfile_read(self, args)
static short rs[8192], gs[8192], bs[8192];
int x, y;
if ( !imgfile_open(args) )
if ( !getargs(args, "s", &fname) )
return 0;
if ( !imgfile_open(fname) )
return NULL;
if ( image->colormap != CM_NORMAL ) {
@ -138,6 +137,78 @@ imgfile_read(self, args)
return rv;
}
static object *
imgfile_readscaled(self, args)
object *self;
object *args;
{
char *fname;
object *rv;
int xsize, ysize, zsize;
char *cdatap;
long *idatap;
static short rs[8192], gs[8192], bs[8192];
int x, y;
int xwtd, ywtd, xorig, yorig;
float xfac, yfac;
int cnt;
if ( !getargs(args, "(sii)", &fname, &xwtd, &ywtd) )
return 0;
if ( !imgfile_open(fname) )
return NULL;
if ( image->colormap != CM_NORMAL ) {
err_setstr(ImgfileError, "Can only handle CM_NORMAL images");
return NULL;
}
if ( BPP(image->type) != 1 ) {
err_setstr(ImgfileError, "Cannot handle imgfiles with bpp!=1");
return NULL;
}
xsize = image->xsize;
ysize = image->ysize;
zsize = image->zsize;
if ( zsize != 1 && zsize != 3) {
err_setstr(ImgfileError, "Can only handle 1 or 3 byte pixels");
return NULL;
}
if ( zsize == 3 ) zsize = 4;
rv = newsizedstringobject(NULL, xwtd*ywtd*zsize);
xfac = (float)xsize/(float)xwtd;
yfac = (float)ysize/(float)ywtd;
if ( rv == NULL )
return NULL;
cdatap = getstringvalue(rv);
idatap = (long *)cdatap;
for ( y=0; y < ywtd && !error_called; y++ ) {
yorig = (int)(y*yfac);
if ( zsize == 1 ) {
getrow(image, rs, yorig, 0);
for(x=0; x<xwtd; x++ ) {
*cdatap++ = rs[(int)(x*xfac)];
}
} else {
getrow(image, rs, yorig, 0);
getrow(image, gs, yorig, 1);
getrow(image, bs, yorig, 2);
for(x=0; x<xwtd; x++ ) {
xorig = (int)(x*xfac);
*idatap++ = (rs[xorig] & 0xff) |
((gs[xorig] & 0xff)<<8) |
((bs[xorig] & 0xff)<<16);
}
}
}
if ( error_called ) {
DECREF(rv);
return NULL;
}
return rv;
}
static object *
imgfile_getsizes(self, args)
object *self;
@ -146,7 +217,10 @@ imgfile_getsizes(self, args)
char *fname;
object *rv;
if ( !imgfile_open(args) )
if ( !getargs(args, "s", &fname) )
return 0;
if ( !imgfile_open(fname) )
return NULL;
rv = newtupleobject(3);
if ( rv == NULL )
@ -159,8 +233,9 @@ imgfile_getsizes(self, args)
static struct methodlist imgfile_methods[] = {
{ "getsizes", imgfile_getsizes },
{ "read", imgfile_read },
{ "getsizes", imgfile_getsizes },
{ "read", imgfile_read },
{ "readscaled", imgfile_readscaled },
{ 0, 0 }
};