79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
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/*
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* tkImgUtil.c --
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*
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* This file contains image related utility functions.
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*
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* Copyright (c) 1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkImgUtil.c 1.3 96/02/15 18:53:12
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*/
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#include "tkInt.h"
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#include "tkPort.h"
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#include "xbytes.h"
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/*
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*----------------------------------------------------------------------
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*
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* TkAlignImageData --
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*
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* This function takes an image and copies the data into an
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* aligned buffer, performing any necessary bit swapping.
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*
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* Results:
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* Returns a newly allocated buffer that should be freed by the
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* caller.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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char *
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TkAlignImageData(image, alignment, bitOrder)
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XImage *image; /* Image to be aligned. */
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int alignment; /* Number of bytes to which the data should
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* be aligned (e.g. 2 or 4) */
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int bitOrder; /* Desired bit order: LSBFirst or MSBFirst. */
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{
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long dataWidth;
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char *data, *srcPtr, *destPtr;
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int i, j;
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if (image->bits_per_pixel != 1) {
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panic("TkAlignImageData: Can't handle image depths greater than 1.");
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}
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/*
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* Compute line width for output data buffer.
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*/
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dataWidth = image->bytes_per_line;
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if (dataWidth % alignment) {
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dataWidth += (alignment - (dataWidth % alignment));
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}
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data = ckalloc(dataWidth * image->height);
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destPtr = data;
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for (i = 0; i < image->height; i++) {
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srcPtr = &image->data[i * image->bytes_per_line];
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for (j = 0; j < dataWidth; j++) {
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if (j >= image->bytes_per_line) {
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*destPtr = 0;
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} else if (image->bitmap_bit_order != bitOrder) {
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*destPtr = xBitReverseTable[(unsigned char)(*(srcPtr++))];
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} else {
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*destPtr = *(srcPtr++);
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}
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destPtr++;
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}
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}
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return data;
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}
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