shared_source/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	/* $Header$ */
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 */