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/*
* Created: zov : 17-Apr-1998 : Loads XWD image from file
* Note: Adapted from Xw_load_image.c
*
XW_EXT_IMAGEDATA* Xw_load_xwd_image (awindow,aimageinfo,fimage,ppcolors,pncolors)
XW_EXT_WINDOW *awindow
XW_USERDATA *aimageinfo
XColor **ppcolors - address of pointer to array of used colors to return
int *pncolors - address of a variable to return length of the array in
Gets an image from a file.
Note, that the file must be XWD formatted.
Returns the image descriptor address if successful; or NULL if failed.
*/
#include <Xw_Extension.h>
#include <fcntl.h>
#define SWAPTEST (*(char*)&swaptest)
static unsigned long swaptest = 1;
static void SwapLong (register char* bp,register unsigned n)
/*
Swap long ints depending on CPU
*/
{
register char c;
register char *ep = bp + n;
register char *sp;
while (bp < ep) {
sp = bp + 3;
c = *sp;
*sp = *bp;
*bp++ = c;
sp = bp + 1;
c = *sp;
*sp = *bp;
*bp++ = c;
bp += 2;
}
}
static void SwapShort (register char* bp, register unsigned n)
/*
Swap short ints depending on CPU
*/
{
register char c;
register char *ep = bp + n;
while (bp < ep) {
c = *bp;
*bp = *(bp + 1);
bp++;
*bp++ = c;
}
}
XW_EXT_IMAGEDATA* Xw_load_xwd_image (void *awindow,void *aimageinfo,char *filename,int fimage,
XColor **ppcolors, int *pncolors)
{
// XW_EXT_WINDOW *pwindow = (XW_EXT_WINDOW *)awindow;
XW_EXT_IMAGEDATA *pimage;
// XW_STATUS status;
XWDFileHeader *pheader;
XImage *pximage;
XColor *pcolors = NULL;
char *wname = NULL, *pidata;
int i, isize;
isize = sizeof (XWDFileHeader);
if (!(pheader = (_xwd_file_header*) Xw_malloc (isize))) {
/*ERROR*Bad Image allocation*/
Xw_set_error (60,"Xw_load_xwd_image",0) ;
return (NULL) ;
}
if (read(fimage,pheader,isize) != isize) {
/*ERROR*Unable to read XWD file header*/
Xw_set_error (56,"Xw_load_xwd_image",filename);
Xw_free (pheader);
return (NULL);
}
if (SWAPTEST) SwapLong ((char*) pheader, isize);
/* Is it XWD file format ? */
if (pheader->file_version != XWD_FILE_VERSION) {
/*ERROR*Bad XWD file format*/
Xw_set_error (57,"Xw_load_xwd_image",filename);
Xw_free (pheader);
return (NULL);
}
if (pheader->header_size < (unsigned int ) isize) {
/*ERROR*Bad XWD file format*/
Xw_set_error (57,"Xw_load_xwd_image",filename);
Xw_free (pheader);
return (NULL);
}
/* Check for image format */
if (pheader->pixmap_format != ZPixmap) {
/*ERROR*Bad XWD Pixmap format*/
Xw_set_error (58,"Xw_load_xwd_image",filename);
Xw_free (pheader);
return (NULL);
}
/* Read a window name */
isize = pheader->header_size - isize ;
if (isize > 0) {
if (! (wname = (char*) Xw_malloc(isize))) {
/*ERROR*Bad Image allocation*/
Xw_set_error(60,"Xw_load_xwd_image",0);
Xw_free(pheader);
return (NULL);
}
if(read (fimage, wname, isize) != isize) {
/*ERROR*Unable to read Image data*/
Xw_set_error(61,"Xw_load_xwd_image",filename) ;
Xw_free (wname);
Xw_free (pheader);
return (NULL) ;
}
}
/* Allocate the Image structure */
if (! (pximage = (XImage*) Xw_malloc(sizeof(XImage)))) {
/*ERROR*Bad Image allocation*/
Xw_set_error(60,"Xw_load_xwd_image",0);
if (wname) Xw_free(wname);
Xw_free(pheader) ;
return (NULL);
}
if (pheader->ncolors > 0) {
/* Allocate the Color Table entries */
if (! (pcolors = (XColor*) Xw_calloc(pheader->ncolors, sizeof(XColor)))) {
/*ERROR*Bad Image allocation*/
Xw_set_error (60,"Xw_load_xwd_image",0);
if (wname) Xw_free(wname);
Xw_free (pximage);
Xw_free (pheader);
return (NULL);
}
/* Read the Color Table entries */
isize = sizeof(XWDColor) * pheader->ncolors;
if (read (fimage, (char *)pcolors, isize) != isize) {
/*ERROR*Unable to read Image data*/
Xw_set_error(61,"Xw_load_xwd_image",filename);
if (wname) Xw_free(wname);
Xw_free (pximage);
Xw_free (pcolors);
Xw_free (pheader);
return (NULL) ;
}
/* 32->64 bits conversion if any*/
if (sizeof(XColor) > sizeof(XWDColor)) {
XWDColor *qcolors = (XWDColor*) pcolors ;
for( i=pheader->ncolors-1 ; i>=0 ; --i ) {
pcolors[i].pad = qcolors[i].pad;
pcolors[i].flags = qcolors[i].flags;
pcolors[i].blue = qcolors[i].blue;
pcolors[i].green = qcolors[i].green;
pcolors[i].red = qcolors[i].red;
pcolors[i].pixel = qcolors[i].pixel;
}
}
if (SWAPTEST) {
for (i=0 ; (unsigned int ) i<pheader->ncolors ; i++) {
SwapLong((char*) &pcolors[i].pixel,sizeof(long));
SwapShort((char*) &pcolors[i].red,3*sizeof(short));
}
}
} /* end if # colors > 0 */
/* Allocate the pixel buffer */
isize = pheader->bytes_per_line*pheader->pixmap_height;
if (! (pidata = (char *) Xw_malloc(isize))) {
/*ERROR*Bad Image allocation*/
Xw_set_error (60,"Xw_load_xwd_image",0);
if (wname) Xw_free(wname);
Xw_free (pximage);
if (pcolors) Xw_free(pcolors);
Xw_free(pheader);
return (NULL);
}
/* Read the pixel buffer */
if (read (fimage,pidata,isize) != isize) {
/*ERROR*Unable to read Image data*/
Xw_set_error (61,"Xw_load_xwd_image",filename);
if (wname) Xw_free(wname);
Xw_free (pidata);
Xw_free (pximage);
if (pcolors) Xw_free (pcolors);
Xw_free (pheader);
return (NULL);
}
/* Allocate the Extended Image structure */
if(! (pimage = Xw_add_imagedata_structure(sizeof(XW_EXT_IMAGEDATA)))) {
if (wname) Xw_free(wname);
Xw_free(pidata);
Xw_free(pximage);
if (pcolors) Xw_free(pcolors);
Xw_free(pheader);
return (NULL);
}
/* Initialize the input image */
pimage->pimageinfo = aimageinfo;
_IIMAGE = pximage;
_IIMAGE->data = pidata;
_IIMAGE->width = (int) pheader->pixmap_width;
_IIMAGE->height = (int) pheader->pixmap_height;
_IIMAGE->xoffset = (int) pheader->xoffset;
_IIMAGE->format = (int) pheader->pixmap_format;
_IIMAGE->byte_order = (int) pheader->byte_order;
_IIMAGE->bitmap_unit = (int) pheader->bitmap_unit;
_IIMAGE->bitmap_bit_order = (int) pheader->bitmap_bit_order;
_IIMAGE->bitmap_pad = (int) pheader->bitmap_pad;
_IIMAGE->depth = (int) pheader->pixmap_depth;
_IIMAGE->bits_per_pixel = (int) pheader->bits_per_pixel;
_IIMAGE->bytes_per_line = (int) pheader->bytes_per_line;
_IIMAGE->red_mask = pheader->red_mask;
_IIMAGE->green_mask = pheader->green_mask;
_IIMAGE->blue_mask = pheader->blue_mask;
_IIMAGE->obdata = NULL ;
_XInitImageFuncPtrs (_IIMAGE);
/* Return array of colors */
*ppcolors = pcolors;
*pncolors = pheader->ncolors;
if (wname) Xw_free(wname);
if (pheader) Xw_free(pheader);
return (pimage);
}
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