📄 [转载]framebuffer驱动程序模型 - linux dev - 逍遥游.htm
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<P
style="MARGIN: 5px; LINE-HEIGHT: 150%"><CODE><SPAN
style="COLOR: rgb(0,0,0)"><SPAN
style="COLOR: rgb(255,153,0)">/*颜色映射表*/</SPAN><BR><SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_cmap <SPAN
style="COLOR: rgb(0,0,204)">{</SPAN><BR> __u32
start<SPAN style="COLOR: rgb(0,0,204)">;</SPAN>
<SPAN style="COLOR: rgb(255,153,0)">/* First
entry
*/</SPAN><BR> __u32
len<SPAN style="COLOR: rgb(0,0,204)">;</SPAN>
<SPAN style="COLOR: rgb(255,153,0)">/* Number of
entries
*/</SPAN><BR> __u16
<SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>red<SPAN
style="COLOR: rgb(0,0,204)">;</SPAN> <SPAN
style="COLOR: rgb(255,153,0)">/* 红色
*/</SPAN><BR> __u16
<SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>green<SPAN
style="COLOR: rgb(0,0,204)">;</SPAN> <SPAN
style="COLOR: rgb(255,153,0)">/*绿色*/</SPAN><BR> __u16
<SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>blue<SPAN
style="COLOR: rgb(0,0,204)">;</SPAN> <SPAN
style="COLOR: rgb(255,153,0)">/*蓝色*/</SPAN><BR> __u16
<SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>transp<SPAN
style="COLOR: rgb(0,0,204)">;</SPAN> <SPAN
style="COLOR: rgb(255,153,0)">/* 透明度,允许 NULL
*/</SPAN><BR><SPAN
style="COLOR: rgb(0,0,204)">}</SPAN><SPAN
style="COLOR: rgb(0,0,204)">;</SPAN></SPAN></CODE></P></TD></TR></TBODY></TABLE><BR>该结构在fb.h文件中定义，在struct
fb_ops结构中有两个成员函数与其相关：<BR><BR>
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<P
style="MARGIN: 5px; LINE-HEIGHT: 150%"><CODE><SPAN
style="COLOR: rgb(0,0,0)"><SPAN
style="COLOR: rgb(255,153,0)">/*获取颜色表*/</SPAN><BR><SPAN
style="COLOR: rgb(0,0,255)">int</SPAN> <SPAN
style="COLOR: rgb(0,0,204)">(</SPAN><SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>fb_get_cmap<SPAN
style="COLOR: rgb(0,0,204)">)</SPAN><SPAN
style="COLOR: rgb(0,0,204)">(</SPAN><SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_cmap <SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>cmap<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN> kspc<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN> con<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_info <SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>info<SPAN
style="COLOR: rgb(0,0,204)">)</SPAN><SPAN
style="COLOR: rgb(0,0,204)">;</SPAN><BR><SPAN
style="COLOR: rgb(255,153,0)">/*设定颜色表*/</SPAN><BR><SPAN
style="COLOR: rgb(0,0,255)">int</SPAN> <SPAN
style="COLOR: rgb(0,0,204)">(</SPAN><SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>fb_set_cmap<SPAN
style="COLOR: rgb(0,0,204)">)</SPAN><SPAN
style="COLOR: rgb(0,0,204)">(</SPAN><SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_cmap <SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>cmap<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN> kspc<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN> con<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_info <SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>info<SPAN
style="COLOR: rgb(0,0,204)">)</SPAN><SPAN
style="COLOR: rgb(0,0,204)">;</SPAN></SPAN></CODE></P></TD></TR></TBODY></TABLE><BR><BR>在struct
fb_info结构中有变量：<BR> <BR>
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<P
style="MARGIN: 5px; LINE-HEIGHT: 150%"><CODE><SPAN
style="COLOR: rgb(0,0,0)"><SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_cmap cmap<SPAN
style="COLOR: rgb(0,0,204)">;</SPAN> <SPAN
style="COLOR: rgb(255,153,0)">/* Current cmap
*/</SPAN></SPAN></CODE></P></TD></TR></TBODY></TABLE><BR>在fpgen基础操作下提供：<BR><BR>
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<P
style="MARGIN: 5px; LINE-HEIGHT: 150%"><CODE><SPAN
style="COLOR: rgb(0,0,0)"><SPAN
style="COLOR: rgb(0,0,255)">extern</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN>
<BR></SPAN></CODE></P>
<P
style="MARGIN: 5px; LINE-HEIGHT: 150%"><CODE><SPAN
style="COLOR: rgb(0,0,0)">fbgen_get_cmap<SPAN
style="COLOR: rgb(0,0,204)">(</SPAN><SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_cmap <SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>cmap<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN> kspc<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN> con<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_info <SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>info<SPAN
style="COLOR: rgb(0,0,204)">)</SPAN><SPAN
style="COLOR: rgb(0,0,204)">;</SPAN><BR><SPAN
style="COLOR: rgb(0,0,255)">extern</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN>
<BR></SPAN></CODE></P>
<P
style="MARGIN: 5px; LINE-HEIGHT: 150%"><CODE><SPAN
style="COLOR: rgb(0,0,0)">fbgen_set_cmap<SPAN
style="COLOR: rgb(0,0,204)">(</SPAN><SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_cmap <SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>cmap<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN> kspc<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN> con,
<SPAN style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_info <SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>info<SPAN
style="COLOR: rgb(0,0,204)">)</SPAN><SPAN
style="COLOR: rgb(0,0,204)">;</SPAN></SPAN></CODE></P></TD></TR></TBODY></TABLE><BR>在文件/*
drivers/video/fbcmap.c */中提供更多的cmap应用<BR><BR>
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<P
style="MARGIN: 5px; LINE-HEIGHT: 150%"><CODE><SPAN
style="COLOR: rgb(0,0,0)"><SPAN
style="COLOR: rgb(0,0,255)">extern</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN>
fb_alloc_cmap<SPAN
style="COLOR: rgb(0,0,204)">(</SPAN><SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_cmap <SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>cmap<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN> len<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN>
transp<SPAN
style="COLOR: rgb(0,0,204)">)</SPAN><SPAN
style="COLOR: rgb(0,0,204)">;</SPAN><BR><SPAN
style="COLOR: rgb(0,0,255)">extern</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">void</SPAN>
fb_copy_cmap<SPAN
style="COLOR: rgb(0,0,204)">(</SPAN><SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_cmap <SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>from<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
fb_cmap <SPAN
style="COLOR: rgb(0,0,204)">*</SPAN>to<SPAN
style="COLOR: rgb(0,0,204)">,</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN>
fsfromto<SPAN
style="COLOR: rgb(0,0,204)">)</SPAN><SPAN
style="COLOR: rgb(0,0,204)">;</SPAN><BR><SPAN
style="COLOR: rgb(0,0,255)">extern</SPAN> <SPAN
style="COLOR: rgb(0,0,255)">int</SPAN>
fb_get_cmap<SPAN
style="COLOR: rgb(0,0,204)">(</SPAN><SPAN
style="COLOR: rgb(0,0,255)">struct</SPAN>
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