src/c_tk_base_7_5_w_mods/tkimgutil.c

/* $Header$ */

/* 
 * tkImgUtil.c --
 *
 *      This file contains image related utility functions.
 *
 * Copyright (c) 1995 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkimgutil.c,v 1.1.1.1 2001/06/13 05:03:31 dtashley Exp $
 */

#include "tkInt.h"
#include "tkPort.h"
#include "xbytes.h"


/*
 *----------------------------------------------------------------------
 *
 * TkAlignImageData --
 *
 *      This function takes an image and copies the data into an
 *      aligned buffer, performing any necessary bit swapping.
 *
 * Results:
 *      Returns a newly allocated buffer that should be freed by the
 *      caller.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

char *
TkAlignImageData(image, alignment, bitOrder)
    XImage *image;              /* Image to be aligned. */
    int alignment;              /* Number of bytes to which the data should
                                 * be aligned (e.g. 2 or 4) */
    int bitOrder;               /* Desired bit order: LSBFirst or MSBFirst. */
{
    long dataWidth;
    char *data, *srcPtr, *destPtr;
    int i, j;

    if (image->bits_per_pixel != 1) {
        panic("TkAlignImageData: Can't handle image depths greater than 1.");
    }

    /*
     * Compute line width for output data buffer.
     */

    dataWidth = image->bytes_per_line;
    if (dataWidth % alignment) {
        dataWidth += (alignment - (dataWidth % alignment));
    }

    data = ckalloc(dataWidth * image->height);

    destPtr = data;
    for (i = 0; i < image->height; i++) {
        srcPtr = &image->data[i * image->bytes_per_line];
        for (j = 0; j < dataWidth; j++) {
            if (j >= image->bytes_per_line) {
                *destPtr = 0;
            } else if (image->bitmap_bit_order != bitOrder) {
                *destPtr = xBitReverseTable[(unsigned char)(*(srcPtr++))];
            } else {
                *destPtr = *(srcPtr++);
            }
            destPtr++;
        }
    }
    return data;
}

/* End of tkimgutil.c */
1	dashley	71	/* $Header$ */
2
3			/*
4			* tkImgUtil.c --
5			*
6			* This file contains image related utility functions.
7			*
8			* Copyright (c) 1995 Sun Microsystems, Inc.
9			*
10			* See the file "license.terms" for information on usage and redistribution
11			* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
12			*
13			* RCS: @(#) $Id: tkimgutil.c,v 1.1.1.1 2001/06/13 05:03:31 dtashley Exp $
14			*/
15
16			#include "tkInt.h"
17			#include "tkPort.h"
18			#include "xbytes.h"
19
20
21			/*
22			*----------------------------------------------------------------------
23			*
24			* TkAlignImageData --
25			*
26			* This function takes an image and copies the data into an
27			* aligned buffer, performing any necessary bit swapping.
28			*
29			* Results:
30			* Returns a newly allocated buffer that should be freed by the
31			* caller.
32			*
33			* Side effects:
34			* None.
35			*
36			*----------------------------------------------------------------------
37			*/
38
39			char *
40			TkAlignImageData(image, alignment, bitOrder)
41			XImage image; / Image to be aligned. */
42			int alignment; /* Number of bytes to which the data should
43			* be aligned (e.g. 2 or 4) */
44			int bitOrder; /* Desired bit order: LSBFirst or MSBFirst. */
45			{
46			long dataWidth;
47			char data, srcPtr, *destPtr;
48			int i, j;
49
50			if (image->bits_per_pixel != 1) {
51			panic("TkAlignImageData: Can't handle image depths greater than 1.");
52			}
53
54			/*
55			* Compute line width for output data buffer.
56			*/
57
58			dataWidth = image->bytes_per_line;
59			if (dataWidth % alignment) {
60			dataWidth += (alignment - (dataWidth % alignment));
61			}
62
63			data = ckalloc(dataWidth * image->height);
64
65			destPtr = data;
66			for (i = 0; i < image->height; i++) {
67			srcPtr = &image->data[i * image->bytes_per_line];
68			for (j = 0; j < dataWidth; j++) {
69			if (j >= image->bytes_per_line) {
70			*destPtr = 0;
71			} else if (image->bitmap_bit_order != bitOrder) {
72			destPtr = xBitReverseTable[(unsigned char)((srcPtr++))];
73			} else {
74			destPtr = (srcPtr++);
75			}
76			destPtr++;
77			}
78			}
79			return data;
80			}
81
82			/* End of tkimgutil.c */