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3 <title>Cerium: fb.h Source File</title>
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21 <h1>fb.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#if defined(__linux__)</span>
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22 <a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#include <unistd.h></span>
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23 <a name="l00003"></a>00003 <span class="preprocessor">#include <stdio.h></span>
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24 <a name="l00004"></a>00004 <span class="preprocessor">#include <fcntl.h></span>
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25 <a name="l00005"></a>00005 <span class="preprocessor">#include <linux/fb.h></span>
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26 <a name="l00006"></a>00006 <span class="preprocessor">#include <linux/fs.h></span>
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27 <a name="l00007"></a>00007 <span class="preprocessor">#include <sys/mman.h></span>
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28 <a name="l00008"></a>00008 <span class="preprocessor">#include <sys/ioctl.h></span>
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29 <a name="l00009"></a>00009 <span class="preprocessor">#include <stdlib.h></span>
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30 <a name="l00010"></a>00010 <span class="preprocessor">#include <iostream></span>
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31 <a name="l00011"></a>00011 <span class="keyword">using namespace </span>std;
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32 <a name="l00012"></a>00012
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33 <a name="l00013"></a>00013 <span class="preprocessor">#define DEVICE_NAME "/dev/fb0"</span>
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34 <a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor">#define DIV_BYTE 8</span>
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35 <a name="l00015"></a>00015 <span class="preprocessor"></span>
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36 <a name="l00016"></a>00016 <span class="comment">/* function prototype */</span>
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37 <a name="l00017"></a>00017 <span class="keywordtype">void</span> send_current_error_msg(<span class="keyword">const</span> <span class="keywordtype">char</span> *ptr);
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38 <a name="l00018"></a>00018 <span class="keywordtype">void</span> send_current_information(<span class="keyword">const</span> <span class="keywordtype">char</span> *ptr);
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39 <a name="l00019"></a>00019
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40 <a name="l00020"></a>00020 <span class="keywordtype">int</span> get_fbdev_addr(<span class="keywordtype">void</span>)
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41 <a name="l00021"></a>00021 {
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42 <a name="l00022"></a>00022 <span class="keywordtype">int</span> fd_framebuffer ;
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43 <a name="l00023"></a>00023 <span class="keyword">struct </span>fb_var_screeninfo vinfo;
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44 <a name="l00024"></a>00024 <span class="keyword">struct </span>fb_fix_screeninfo finfo;
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45 <a name="l00025"></a>00025 <span class="keywordtype">long</span> <span class="keywordtype">int</span> screensize ;
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46 <a name="l00026"></a>00026 <span class="comment">//long int location;</span>
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47 <a name="l00027"></a>00027 <span class="keywordtype">char</span> *fbptr ;
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48 <a name="l00028"></a>00028 <span class="keywordtype">char</span> tmp[DIV_BYTE*10];
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49 <a name="l00029"></a>00029
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50 <a name="l00030"></a>00030 <span class="comment">//int x , y ;</span>
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51 <a name="l00031"></a>00031 <span class="keywordtype">int</span> xres,yres,vbpp,line_len;
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52 <a name="l00032"></a>00032 <span class="comment">//unsigned short tcolor ;</span>
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53 <a name="l00033"></a>00033
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54 <a name="l00034"></a>00034 <span class="comment">/* 読み書き用にファイルを開く */</span>
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55 <a name="l00035"></a>00035 fd_framebuffer = open( DEVICE_NAME , O_RDWR);
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56 <a name="l00036"></a>00036 <span class="keywordflow">if</span> ( !fd_framebuffer ) {
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57 <a name="l00037"></a>00037 send_current_error_msg(<span class="stringliteral">"Framebuffer device open error !"</span>);
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58 <a name="l00038"></a>00038 exit(1);
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59 <a name="l00039"></a>00039 }
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60 <a name="l00040"></a>00040 send_current_information(<span class="stringliteral">"The framebuffer device was opened !"</span>);
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61 <a name="l00041"></a>00041
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62 <a name="l00042"></a>00042 <span class="comment">/* 固定スクリーン情報取得 */</span>
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63 <a name="l00043"></a>00043 <span class="keywordflow">if</span> ( ioctl( fd_framebuffer , FBIOGET_FSCREENINFO , &finfo ) ) {
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64 <a name="l00044"></a>00044 send_current_error_msg(<span class="stringliteral">"Fixed information not gotton !"</span>);
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65 <a name="l00045"></a>00045 exit(2);
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66 <a name="l00046"></a>00046 }
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67 <a name="l00047"></a>00047
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68 <a name="l00048"></a>00048 <span class="comment">/* 変動スクリーン情報取得 */</span>
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69 <a name="l00049"></a>00049 <span class="keywordflow">if</span> ( ioctl( fd_framebuffer , FBIOGET_VSCREENINFO , &vinfo ) ) {
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70 <a name="l00050"></a>00050 send_current_error_msg(<span class="stringliteral">"Variable information not gotton !"</span>);
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71 <a name="l00051"></a>00051 exit(3);
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72 <a name="l00052"></a>00052 }
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73 <a name="l00053"></a>00053 xres = vinfo.xres ;
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74 <a name="l00054"></a>00054 yres = vinfo.yres ;
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75 <a name="l00055"></a>00055 vbpp = vinfo.bits_per_pixel ;
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76 <a name="l00056"></a>00056 line_len = finfo.line_length ;
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77 <a name="l00057"></a>00057 sprintf( tmp , <span class="stringliteral">"%d(pixel)x%d(line), %dbpp(bits per pixel)"</span>,xres,yres,vbpp);
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78 <a name="l00058"></a>00058 send_current_information( tmp );
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79 <a name="l00059"></a>00059
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80 <a name="l00060"></a>00060 <span class="comment">/* バイト単位でのスクリーンのサイズを計算 */</span>
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81 <a name="l00061"></a>00061 screensize = xres * yres * vbpp / DIV_BYTE ;
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82 <a name="l00062"></a>00062
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83 <a name="l00063"></a>00063 <span class="comment">/* デバイスをメモリにマップする */</span>
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84 <a name="l00064"></a>00064 fbptr = (<span class="keywordtype">char</span> *)mmap(0,screensize,PROT_READ | PROT_WRITE,MAP_SHARED,fd_framebuffer,0);
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85 <a name="l00065"></a>00065 <span class="keywordflow">if</span> ( (<span class="keywordtype">int</span>)fbptr == -1 ) {
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86 <a name="l00066"></a>00066 send_current_error_msg(<span class="stringliteral">"Don't get framebuffer device to memory !"</span>);
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87 <a name="l00067"></a>00067 exit(4);
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88 <a name="l00068"></a>00068 }
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89 <a name="l00069"></a>00069 send_current_information(<span class="stringliteral">"The framebuffer device was mapped !"</span>);
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90 <a name="l00070"></a>00070
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91 <a name="l00071"></a>00071 printf(<span class="stringliteral">"fb: 0x%x \n"</span>, (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)fbptr);
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92 <a name="l00072"></a>00072 <span class="keywordflow">return</span> (<span class="keywordtype">int</span>)fbptr;
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93 <a name="l00073"></a>00073 <span class="comment">//munmap(fbptr,screensize);</span>
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94 <a name="l00074"></a>00074 <span class="comment">//close(fd_framebuffer);</span>
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95 <a name="l00075"></a>00075 <span class="comment">//return 0;</span>
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96 <a name="l00076"></a>00076 }
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97 <a name="l00077"></a>00077
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98 <a name="l00078"></a>00078 <span class="keywordtype">void</span> send_current_error_msg(<span class="keyword">const</span> <span class="keywordtype">char</span> *ptr)
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99 <a name="l00079"></a>00079 {
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100 <a name="l00080"></a>00080 fprintf( stderr , <span class="stringliteral">"%s\n"</span> , ptr );
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101 <a name="l00081"></a>00081 }
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102 <a name="l00082"></a>00082
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103 <a name="l00083"></a>00083 <span class="keywordtype">void</span> send_current_information(<span class="keyword">const</span> <span class="keywordtype">char</span> *ptr)
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104 <a name="l00084"></a>00084 {
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105 <a name="l00085"></a>00085 fprintf( stdout , <span class="stringliteral">"%s\n"</span> , ptr );
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106 <a name="l00086"></a>00086 }
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107 <a name="l00087"></a>00087 <span class="preprocessor">#else </span><span class="comment">/* !defined(__linux__) */</span>
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108 <a name="l00088"></a>00088 <span class="keywordtype">int</span> get_fbdev_addr(<span class="keywordtype">void</span>) {<span class="keywordflow">return</span> 0;}
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109 <a name="l00089"></a>00089 <span class="preprocessor">#endif </span><span class="comment">/* defined(__linux__) */</span>
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110 <a name="l00090"></a>00090
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111 <a name="l00091"></a>00091 <span class="keyword">extern</span> <span class="keywordtype">int</span> get_fbdev_addr(<span class="keywordtype">void</span>);
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112 </pre></div></div>
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113 <hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 5 17:51:27 2009 for Cerium by
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114 <a href="http://www.doxygen.org/index.html">
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115 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.7.1 </small></address>
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116 </body>
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117 </html>
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