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118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/*
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* $Id: icpixels.c,v 1.1 2003-02-21 14:51:11 cworth Exp $
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*
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* Copyright © 1998 Keith Packard
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Keith Packard not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Keith Packard makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $XFree86: $ */
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#include "icint.h"
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static void
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IcPixelsInit (IcPixels *pixels, IcBits *data, int width, int height, int depth, int bpp, int stride);
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static unsigned int
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IcBitsPerPixel (unsigned int depth);
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static unsigned int
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IcBitsPerPixel (unsigned int depth)
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{
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if (depth > 8)
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if (depth > 16)
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return 32;
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else
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return 16;
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else
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if (depth > 4)
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return 8;
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else if (depth > 1)
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return 4;
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else
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return 1;
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}
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IcPixels *
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IcPixelsCreate (unsigned int width, unsigned int height, unsigned int depth)
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{
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IcPixels *pixels;
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IcBits *data;
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unsigned int datasize;
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unsigned int bpp;
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unsigned int stride;
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unsigned int adjust;
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unsigned int base;
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bpp = IcBitsPerPixel (depth);
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stride = ((width * bpp + IC_MASK) >> IC_SHIFT) * sizeof (IcBits);
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datasize = height * stride;
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base = sizeof (IcPixels);
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adjust = 0;
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if (base & 7)
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adjust = 8 - (base & 7);
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datasize += adjust;
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pixels = malloc(base + datasize);
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if (!pixels)
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return NULL;
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data = (IcBits *) ((char *)pixels + base + adjust);
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IcPixelsInit (pixels, data, width, height, depth, bpp, stride);
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return pixels;
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}
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IcPixels *
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IcPixelsCreateForData (IcBits *data, int width, int height, int depth, int bpp, int stride)
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{
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IcPixels *pixels;
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pixels = malloc (sizeof (IcPixels));
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if (pixels == NULL)
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return NULL;
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IcPixelsInit (pixels, data, width, height, depth, bpp, stride);
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return pixels;
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}
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static void
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IcPixelsInit (IcPixels *pixels, IcBits *data, int width, int height, int depth, int bpp, int stride)
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{
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pixels->data = data;
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pixels->width = width;
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pixels->height = height;
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pixels->depth = depth;
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pixels->bpp = bpp;
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pixels->stride = stride;
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pixels->x = 0;
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pixels->y = 0;
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pixels->refcnt = 1;
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}
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void
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IcPixelsDestroy (IcPixels *pixels)
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{
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if(--pixels->refcnt)
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return;
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free(pixels);
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}
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