VirtualBox

source: vbox/trunk/src/VBox/Frontends/VBoxFB/Helper.cpp@ 94740

Last change on this file since 94740 was 93115, checked in by vboxsync, 3 years ago

scm --update-copyright-year

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 3.1 KB
Line 
1/** @file
2 *
3 * VBox frontends: Framebuffer (FB, DirectFB):
4 * Helper routines
5 */
6
7/*
8 * Copyright (C) 2006-2022 Oracle Corporation
9 *
10 * This file is part of VirtualBox Open Source Edition (OSE), as
11 * available from http://www.virtualbox.org. This file is free software;
12 * you can redistribute it and/or modify it under the terms of the GNU
13 * General Public License (GPL) as published by the Free Software
14 * Foundation, in version 2 as it comes in the "COPYING" file of the
15 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
16 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
17 */
18
19#include "VBoxFB.h"
20#include "Helper.h"
21
22/**
23 * Globals
24 */
25videoMode videoModes[MAX_VIDEOMODES] = {{0}};
26uint32_t numVideoModes = 0;
27
28/**
29 * callback handler for populating the supported video modes
30 *
31 * @returns callback success indicator
32 * @param width width in pixels of the current video mode
33 * @param height height in pixels of the current video mode
34 * @param bpp bits per pixel of the current video mode
35 * @param callbackdata user data pointer
36 */
37DFBEnumerationResult enumVideoModesHandler(int width, int height, int bpp, void *callbackdata)
38{
39 if (numVideoModes >= MAX_VIDEOMODES)
40 {
41 return DFENUM_CANCEL;
42 }
43 // don't take palette based modes
44 if (bpp >= 16)
45 {
46 // don't take modes we already have (I have seen many cases where
47 // DirectFB returns the same modes several times)
48 int32_t existingMode = getBestVideoMode(width, height, bpp);
49 if ((existingMode == -1) ||
50 ((videoModes[existingMode].width != (uint32_t)width) ||
51 (videoModes[existingMode].height != (uint32_t)height) ||
52 (videoModes[existingMode].bpp != (uint32_t)bpp)))
53 {
54 videoModes[numVideoModes].width = (uint32_t)width;
55 videoModes[numVideoModes].height = (uint32_t)height;
56 videoModes[numVideoModes].bpp = (uint32_t)bpp;
57 numVideoModes++;
58 }
59 }
60 return DFENUM_OK;
61}
62
63/**
64 * Returns the best fitting video mode for the given characteristics.
65 *
66 * @returns index of the best video mode, -1 if no suitable mode found
67 * @param width requested width
68 * @param height requested height
69 * @param bpp requested bit depth
70 */
71int32_t getBestVideoMode(uint32_t width, uint32_t height, uint32_t bpp)
72{
73 int32_t bestMode = -1;
74
75 for (uint32_t i = 0; i < numVideoModes; i++)
76 {
77 // is this mode compatible?
78 if ((videoModes[i].width >= width) && (videoModes[i].height >= height) &&
79 (videoModes[i].bpp >= bpp))
80 {
81 // first suitable mode?
82 if (bestMode == -1)
83 {
84 bestMode = i;
85 } else
86 {
87 // is it better than the one we got before?
88 if ((videoModes[i].width < videoModes[bestMode].width) ||
89 (videoModes[i].height < videoModes[bestMode].height) ||
90 (videoModes[i].bpp < videoModes[bestMode].bpp))
91 {
92 bestMode = i;
93 }
94 }
95 }
96 }
97 return bestMode;
98}
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