1 /*
2 *Copyright (C) 2001-2004 Harold L Hunt II All Rights Reserved.
3 *
4 *Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 *"Software"), to deal in the Software without restriction, including
7 *without limitation the rights to use, copy, modify, merge, publish,
8 *distribute, sublicense, and/or sell copies of the Software, and to
9 *permit persons to whom the Software is furnished to do so, subject to
10 *the following conditions:
11 *
12 *The above copyright notice and this permission notice shall be
13 *included in all copies or substantial portions of the Software.
14 *
15 *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 *NONINFRINGEMENT. IN NO EVENT SHALL HAROLD L HUNT II BE LIABLE FOR
19 *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
20 *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21 *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 *
23 *Except as contained in this notice, the name of Harold L Hunt II
24 *shall not be used in advertising or otherwise to promote the sale, use
25 *or other dealings in this Software without prior written authorization
26 *from Harold L Hunt II.
27 *
28 * Authors: Harold L Hunt II
29 */
30
31 #ifdef HAVE_XWIN_CONFIG_H
32 #include <xwin-config.h>
33 #endif
34 #include "win.h"
35
36 /*
37 * Count the number of one bits in a color mask.
38 */
39
40 CARD8
winCountBits(DWORD dw)41 winCountBits(DWORD dw)
42 {
43 DWORD dwBits = 0;
44
45 while (dw) {
46 dwBits += (dw & 1);
47 dw >>= 1;
48 }
49
50 return dwBits;
51 }
52
53 /*
54 * Modify the screen pixmap to point to the new framebuffer address
55 */
56
57 Bool
winUpdateFBPointer(ScreenPtr pScreen,void * pbits)58 winUpdateFBPointer(ScreenPtr pScreen, void *pbits)
59 {
60 winScreenPriv(pScreen);
61 winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;
62
63 /* Location of shadow framebuffer has changed */
64 pScreenInfo->pfb = pbits;
65
66 /* Update the screen pixmap */
67 if (!(*pScreen->ModifyPixmapHeader) (pScreen->devPrivate,
68 pScreen->width,
69 pScreen->height,
70 pScreen->rootDepth,
71 BitsPerPixel(pScreen->rootDepth),
72 PixmapBytePad(pScreenInfo->dwStride,
73 pScreenInfo->dwBPP),
74 pScreenInfo->pfb)) {
75 FatalError("winUpdateFramebufferPointer - Failed modifying "
76 "screen pixmap\n");
77 }
78
79 return TRUE;
80 }
81