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\u5f97\u5230\u7684\u672c\u8d28\u4e0a\u4ecd\u7136\u662f\u4e00\u6bb5\u7ebf\u6027\u7684\u5185\u5b58\u7a7a\u95f4\u3002\u53ea\u4e0d\u8fc7\u5c4f\u5e55\u672c\u8eab\u662f\u4e8c\u7ef4\u7684&#xff0c;\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u50cf\u7d20\u7684\u6a2a\u5750\u6807\u3001\u7eb5\u5750\u6807\u3001\u6bcf\u884c\u5360\u7528\u7684\u5b57\u8282\u6570\u4ee5\u53ca\u6bcf\u4e2a\u50cf\u7d20\u5360\u7528\u7684\u5b57\u8282\u6570&#xff0c;\u8ba1\u7b97\u51fa\u67d0\u4e2a\u5c4f\u5e55\u50cf\u7d20\u5728 Framebuffer \u4e2d\u5bf9\u5e94\u7684\u5185\u5b58\u4f4d\u7f6e\u3002<\/p>\n<ul>\n<li>\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d&#xff0c;\u6211\u4eec\u901a\u5e38\u4f7f\u7528 uint8_t \u6307\u9488\u6765\u4fdd\u5b58\u6620\u5c04\u540e\u7684\u5730\u5740&#xff0c;\u8fd9\u6837\u5c31\u53ef\u4ee5\u76f4\u63a5\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u8fdb\u884c\u5730\u5740\u8ba1\u7b97\u548c\u6570\u636e\u5199\u5165\u3002<\/li>\n<\/ul>\n<p>\u56e0\u6b64&#xff0c;\u5411\u5c4f\u5e55\u663e\u793a\u4e00\u5e45\u56fe\u50cf\u7684\u672c\u8d28&#xff0c;\u5176\u5b9e\u5c31\u662f\u6839\u636e\u56fe\u50cf\u4e2d\u6bcf\u4e2a\u50cf\u7d20\u7684\u4f4d\u7f6e&#xff0c;\u627e\u5230\u5b83\u5728 Framebuffer \u4e2d\u5bf9\u5e94\u7684\u5185\u5b58\u5730\u5740&#xff0c;\u518d\u6309\u7167 Framebuffer \u8981\u6c42\u7684\u50cf\u7d20\u683c\u5f0f&#xff0c;\u628a\u8fd9\u4e2a\u50cf\u7d20\u7684\u6570\u636e\u5199\u5165\u5bf9\u5e94\u4f4d\u7f6e\u3002\u50cf\u7d20\u88ab\u5199\u5165 Framebuffer \u7684\u4ec0\u4e48\u4f4d\u7f6e&#xff0c;\u4e5f\u5c31\u51b3\u5b9a\u4e86\u5b83\u6700\u7ec8\u51fa\u73b0\u5728\u5c4f\u5e55\u4e0a\u7684\u4ec0\u4e48\u4f4d\u7f6e\u3002<\/p>\n<p>\u56e0\u6b64&#xff0c;\u4ece\u5e94\u7528\u7a0b\u5e8f\u7684\u89d2\u5ea6\u6765\u770b&#xff0c;\u6211\u4eec\u53ef\u4ee5\u628a Framebuffer \u4e2d\u7684\u8fd9\u5757\u7f13\u51b2\u533a\u7406\u89e3\u4e3a\u4e00\u5757\u7528\u4e8e\u4fdd\u5b58 LCD \u50cf\u7d20\u70b9\u9635\u4fe1\u606f\u7684\u5185\u5b58\u3002\u8981\u6b63\u786e\u5730\u5411\u5176\u4e2d\u5199\u5165\u56fe\u50cf&#xff0c;\u540e\u7eed\u4e3b\u8981\u9700\u8981\u5173\u6ce8\u4ee5\u4e0b\u51e0\u4e2a\u4fe1\u606f&#xff1a;<\/p>\n<ul>\n<li>\u5c4f\u5e55\u7684\u5206\u8fa8\u7387&#xff0c;\u4e5f\u5c31\u662f\u4e00\u884c\u548c\u4e00\u5217\u5206\u522b\u6709\u591a\u5c11\u4e2a\u50cf\u7d20&#xff1b;<\/li>\n<li>\u6bcf\u4e2a\u50cf\u7d20\u5360\u7528\u591a\u5c11\u4f4d\u3001\u591a\u5c11\u5b57\u8282&#xff1b;<\/li>\n<li>\u6bcf\u4e2a\u989c\u8272\u5206\u91cf\u5728\u4e00\u4e2a\u50cf\u7d20\u4e2d\u7684\u4f4d\u7f6e\u548c\u4f4d\u5bbd&#xff1b;<\/li>\n<li>Framebuffer \u6bcf\u4e00\u884c\u5b9e\u9645\u5360\u7528\u591a\u5c11\u5b57\u8282\u3002<\/li>\n<\/ul>\n<p>\u77e5\u9053\u8fd9\u4e9b\u4fe1\u606f\u4e4b\u540e&#xff0c;\u6211\u4eec\u624d\u80fd\u6839\u636e\u5c4f\u5e55\u5750\u6807\u8ba1\u7b97\u51fa\u6b63\u786e\u7684\u5185\u5b58\u5730\u5740&#xff0c;\u5e76\u6309\u7167\u6b63\u786e\u7684\u683c\u5f0f\u5c06 RGB \u56fe\u50cf\u6570\u636e\u5199\u5165 Framebuffer\u3002<\/p>\n<h3>Framebuffer\u7f16\u7a0b<\/h3>\n<p>\u5728\u8fd9\u4e00\u90e8\u5206&#xff0c;\u6211\u4eec\u4ecb\u7ecd\u5982\u4f55\u901a\u8fc7\u5177\u4f53\u7684API\u6765\u5b9e\u73b0\u56fe\u7247\u663e\u793a\u3002\u5bf9\u4e8e\u6211\u4eec\u73b0\u5728\u4f7f\u7528\u7684 Framebuffer \u663e\u793a\u65b9\u5f0f\u6765\u8bf4&#xff0c;\u5e94\u7528\u7a0b\u5e8f\u7684\u6838\u5fc3\u5de5\u4f5c\u5c31\u662f\u4fee\u6539\u5bf9\u5e94\u7684\u663e\u793a\u7f13\u51b2\u533a\u5185\u5bb9\u3002LCD \u63a7\u5236\u5668\u4f1a\u6309\u7167\u81ea\u5df1\u7684\u663e\u793a\u65f6\u5e8f\u6301\u7eed\u8bfb\u53d6 Framebuffer&#xff0c;\u53ea\u8981\u5e94\u7528\u7a0b\u5e8f\u6b63\u786e\u5730\u4fee\u6539\u4e86\u5bf9\u5e94\u4f4d\u7f6e\u7684\u50cf\u7d20\u6570\u636e&#xff0c;\u65b0\u7684\u5185\u5bb9\u5c31\u80fd\u591f\u53cd\u6620\u5230\u5c4f\u5e55\u4e0a\u3002<\/p>\n<p>\u57fa\u672c\u6b65\u9aa4\u4e3a&#xff1a;<\/p>\n<li>\u6253\u5f00 Framebuffer&#xff0c;\u5e76\u83b7\u53d6\u5c4f\u5e55\u4fe1\u606f<\/li>\n<li>\u5c06 Framebuffer \u6620\u5c04\u5230\u7528\u6237\u7a7a\u95f4<\/li>\n<li>\u8ba1\u7b97\u50cf\u7d20\u5730\u5740&#xff0c;\u5e76\u8f6c\u6362\u50cf\u7d20\u683c\u5f0f<\/li>\n<li>\u5b8c\u6210\u56fe\u50cf\u663e\u793a\u5e76\u91ca\u653e\u8d44\u6e90<\/li>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260830104859-6a940a9b20afb.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>\u4e00\u3001\u6253\u5f00 Framebuffer&#xff0c;\u5e76\u83b7\u53d6\u5c4f\u5e55\u4fe1\u606f<\/h4>\n<h5>1. \u6253\u5f00 Framebuffer \u8bbe\u5907\u8282\u70b9<\/h5>\n<ul>\n<li>Framebuffer \u540c\u6837\u901a\u8fc7\u8bbe\u5907\u6587\u4ef6\u5411\u7528\u6237\u7a7a\u95f4\u63d0\u4f9b\u63a5\u53e3&#xff0c;\u5728\u6211\u4eec\u7684\u7cfb\u7edf\u4e2d\u5bf9\u5e94\u7684\u8bbe\u5907\u8282\u70b9\u901a\u5e38\u4e3a \/dev\/fb0\u3002\u56e0\u6b64&#xff0c;\u9996\u5148\u9700\u8981\u4f7f\u7528 open() \u6253\u5f00\u8bbe\u5907\u3002<\/li>\n<li>\u6253\u5f00\u6210\u529f\u4ee5\u540e\u83b7\u5f97\u7684 fb_fd&#xff0c;\u5c31\u662f\u540e\u7eed\u8c03\u7528 ioctl() \u548c mmap() \u65f6\u4f7f\u7528\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">int<\/span> fb_fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/dev\/fb0&#034;<\/span><span class=\"token punctuation\">,<\/span> O_RDWR<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>fb_fd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;open framebuffer&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>2. \u83b7\u53d6 Framebuffer \u7684\u56fa\u5b9a\u4fe1\u606f<\/h5>\n<p>Framebuffer \u7684\u56fa\u5b9a\u4fe1\u606f\u4fdd\u5b58\u5728 struct fb_fix_screeninfo \u4e2d&#xff0c;\u901a\u8fc7 FBIOGET_FSCREENINFO \u83b7\u53d6\u3002<\/p>\n<p>\u5176\u4e3b\u8981\u7ed3\u6784\u53ef\u4ee5\u7b80\u5316\u7406\u89e3\u4e3a&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">fb_fix_screeninfo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> id<span class=\"token punctuation\">[<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> smem_start<span class=\"token punctuation\">;<\/span><br \/>\n    __u32 smem_len<span class=\"token punctuation\">;<\/span><\/p>\n<p>    __u32 type<span class=\"token punctuation\">;<\/span><br \/>\n    __u32 visual<span class=\"token punctuation\">;<\/span><\/p>\n<p>    __u32 line_length<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4f7f\u7528\u65b9\u5f0f\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">fb_fix_screeninfo<\/span> finfo<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">ioctl<\/span><span class=\"token punctuation\">(<\/span>fb_fd<span class=\"token punctuation\">,<\/span> FBIOGET_FSCREENINFO<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>finfo<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;FBIOGET_FSCREENINFO&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5176\u4e2d\u6211\u4eec\u4e3b\u8981\u5173\u6ce8&#xff1a;<\/p>\n<ul>\n<li>smem_len&#xff1a;Framebuffer \u663e\u5b58\u533a\u57df\u7684\u603b\u5927\u5c0f<\/li>\n<li>line_length&#xff1a;Framebuffer \u4e2d\u4e00\u884c\u50cf\u7d20\u6570\u636e\u5b9e\u9645\u5360\u7528\u7684\u5b57\u8282\u6570<\/li>\n<li>type&#xff1a;Framebuffer \u4f7f\u7528\u7684\u6570\u636e\u7ec4\u7ec7\u65b9\u5f0f<\/li>\n<li>visual&#xff1a;\u989c\u8272\u7684\u8868\u793a\u65b9\u5f0f<\/li>\n<\/ul>\n<p>\u5176\u4e2d\u9700\u8981\u6ce8\u610f\u7684\u662fline_length\u8fd9\u4e2a\u53d8\u91cf&#xff0c;\u76f4\u89c9\u4e0a&#xff0c;\u4e00\u884c\u50cf\u7d20\u5360\u7528\u7684\u7a7a\u95f4\u4f3c\u4e4e\u5e94\u8be5\u7b49\u4e8e\u5c4f\u5e55\u5bbd\u5ea6 \u00d7 \u6bcf\u4e2a\u50cf\u7d20\u5360\u7528\u7684\u5b57\u8282\u6570\u3002\u4f46\u5b9e\u9645\u60c5\u51b5\u4e0d\u4e00\u5b9a\u5982\u6b64\u3002\u9a71\u52a8\u53ef\u80fd\u4f1a\u56e0\u4e3a\u5185\u5b58\u5bf9\u9f50\u7b49\u539f\u56e0&#xff0c;\u4f7f\u6bcf\u4e00\u884c\u5360\u7528\u7684\u5b9e\u9645\u7a7a\u95f4\u66f4\u5927\u3002\u56e0\u6b64&#xff0c;\u540e\u7eed\u8ba1\u7b97\u67d0\u4e2a\u50cf\u7d20\u5728 Framebuffer \u4e2d\u7684\u4f4d\u7f6e\u65f6&#xff0c;\u4e0d\u80fd\u76f4\u63a5\u7528\u5c4f\u5e55\u5bbd\u5ea6\u8ba1\u7b97\u6bcf\u4e00\u884c\u7684\u8de8\u5ea6&#xff0c;\u800c\u5e94\u8be5\u4f7f\u7528\u9a71\u52a8\u8fd4\u56de\u7684 line_length\u3002<\/p>\n<h5>3. \u83b7\u53d6 Framebuffer \u7684\u53ef\u53d8\u4fe1\u606f<\/h5>\n<p>\u5c4f\u5e55\u7684\u5206\u8fa8\u7387\u3001\u6bcf\u4e2a\u50cf\u7d20\u5360\u7528\u7684\u4f4d\u6570\u4ee5\u53ca RGB \u5206\u91cf\u5728\u4e00\u4e2a\u50cf\u7d20\u4e2d\u7684\u6392\u5217\u65b9\u5f0f&#xff0c;\u5219\u4fdd\u5b58\u5728 struct fb_var_screeninfo \u4e2d&#xff0c;\u901a\u8fc7 FBIOGET_VSCREENINFO \u83b7\u53d6\u3002<\/p>\n<p>\u4e3b\u8981\u7ed3\u6784\u53ef\u4ee5\u7b80\u5316\u4e3a&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">fb_bitfield<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    __u32 offset<span class=\"token punctuation\">;<\/span><br \/>\n    __u32 length<span class=\"token punctuation\">;<\/span><br \/>\n    __u32 msb_right<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">fb_var_screeninfo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    __u32 xres<span class=\"token punctuation\">;<\/span><br \/>\n    __u32 yres<span class=\"token punctuation\">;<\/span><\/p>\n<p>    __u32 xres_virtual<span class=\"token punctuation\">;<\/span><br \/>\n    __u32 yres_virtual<span class=\"token punctuation\">;<\/span><\/p>\n<p>    __u32 xoffset<span class=\"token punctuation\">;<\/span><br \/>\n    __u32 yoffset<span class=\"token punctuation\">;<\/span><\/p>\n<p>    __u32 bits_per_pixel<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">fb_bitfield<\/span> red<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">fb_bitfield<\/span> green<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">fb_bitfield<\/span> blue<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">fb_bitfield<\/span> transp<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u83b7\u53d6\u65b9\u5f0f\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">fb_var_screeninfo<\/span> vinfo<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">ioctl<\/span><span class=\"token punctuation\">(<\/span>fb_fd<span class=\"token punctuation\">,<\/span> FBIOGET_VSCREENINFO<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>vinfo<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;FBIOGET_VSCREENINFO&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5176\u4e2d\u4e3b\u8981\u5173\u6ce8&#xff1a;<\/p>\n<ul>\n<li>xres&#xff1a;\u5f53\u524d\u5c4f\u5e55\u53ef\u89c1\u533a\u57df\u7684\u5bbd\u5ea6<\/li>\n<li>yres&#xff1a;\u5f53\u524d\u5c4f\u5e55\u53ef\u89c1\u533a\u57df\u7684\u9ad8\u5ea6<\/li>\n<li>xres_virtual&#xff1a;\u865a\u62df Framebuffer \u7684\u5bbd\u5ea6<\/li>\n<li>yres_virtual&#xff1a;\u865a\u62df Framebuffer \u7684\u9ad8\u5ea6<\/li>\n<li>xoffset&#xff1a;\u5f53\u524d\u53ef\u89c1\u533a\u57df\u5728\u865a\u62df Framebuffer \u4e2d\u7684\u6a2a\u5411\u504f\u79fb<\/li>\n<li>yoffset&#xff1a;\u5f53\u524d\u53ef\u89c1\u533a\u57df\u5728\u865a\u62df Framebuffer \u4e2d\u7684\u7eb5\u5411\u504f\u79fb<\/li>\n<li>bits_per_pixel&#xff1a;\u6bcf\u4e2a\u50cf\u7d20\u5360\u7528\u591a\u5c11 bit<\/li>\n<li>red\u3001green\u3001blue&#xff1a;R\u3001G\u3001B \u4e09\u4e2a\u989c\u8272\u5206\u91cf\u5206\u522b\u5360\u636e\u54ea\u4e9b bit<\/li>\n<li>transp&#xff1a;\u900f\u660e\u5ea6\u5206\u91cf\u5bf9\u5e94\u7684\u4f4d\u7f6e\u548c\u4f4d\u5bbd<\/li>\n<\/ul>\n<p>\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u989c\u8272\u5206\u91cf&#xff0c;\u6211\u4eec\u53c8\u4e3b\u8981\u5173\u6ce8\u4e24\u4e2a\u53c2\u6570&#xff1a;<\/p>\n<ul>\n<li>length&#xff1a;\u8fd9\u4e2a\u989c\u8272\u5206\u91cf\u4f7f\u7528\u591a\u5c11 bit<\/li>\n<li>offset&#xff1a;\u8fd9\u4e2a\u989c\u8272\u5206\u91cf\u4ece\u4e00\u4e2a\u50cf\u7d20\u6570\u636e\u7684\u7b2c\u51e0\u4f4d\u5f00\u59cb\u5b58\u653e<\/li>\n<\/ul>\n<hr \/>\n<h4>\u4e8c\u3001\u4f7f\u7528 mmap() \u5c06 Framebuffer \u6620\u5c04\u5230\u7528\u6237\u7a7a\u95f4<\/h4>\n<p>\u867d\u7136\u6211\u4eec\u5df2\u7ecf\u83b7\u53d6\u4e86 Framebuffer \u7684\u5404\u79cd\u4fe1\u606f&#xff0c;\u4f46\u6b64\u65f6\u8fd8\u4e0d\u80fd\u76f4\u63a5\u50cf\u666e\u901a\u6570\u7ec4\u4e00\u6837\u8bbf\u95ee\u5bf9\u5e94\u7684\u663e\u5b58\u3002<\/p>\n<p>\u56e0\u6b64&#xff0c;\u63a5\u4e0b\u6765\u9700\u8981\u4f7f\u7528 mmap()&#xff0c;\u628a Framebuffer \u663e\u5b58\u6620\u5c04\u5230\u5f53\u524d\u8fdb\u7a0b\u7684\u865a\u62df\u5730\u5740\u7a7a\u95f4\u3002<\/p>\n<p><span class=\"token class-name\">uint8_t<\/span> <span class=\"token operator\">*<\/span>fb_mem<span class=\"token punctuation\">;<\/span><\/p>\n<p>fb_mem <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">mmap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              finfo<span class=\"token punctuation\">.<\/span>smem_len<span class=\"token punctuation\">,<\/span><br \/>\n              PROT_READ <span class=\"token operator\">|<\/span> PROT_WRITE<span class=\"token punctuation\">,<\/span><br \/>\n              MAP_SHARED<span class=\"token punctuation\">,<\/span><br \/>\n              fb_fd<span class=\"token punctuation\">,<\/span><br \/>\n              <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>fb_mem <span class=\"token operator\">&#061;&#061;<\/span> MAP_FAILED<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;mmap framebuffer&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u91cc\u51e0\u4e2a\u53c2\u6570\u5206\u522b\u8868\u793a&#xff1a;<\/p>\n<ul>\n<li>finfo.smem_len&#xff1a;\u9700\u8981\u6620\u5c04\u7684 Framebuffer \u7a7a\u95f4\u5927\u5c0f<\/li>\n<li>PROT_READ | PROT_WRITE&#xff1a;\u5141\u8bb8\u7a0b\u5e8f\u8bfb\u53d6\u548c\u5199\u5165\u8fd9\u5757\u7a7a\u95f4<\/li>\n<li>MAP_SHARED&#xff1a;\u5bf9\u8fd9\u5757\u6620\u5c04\u533a\u57df\u7684\u4fee\u6539\u4f1a\u53cd\u6620\u5230\u5e95\u5c42 Framebuffer \u4e2d<\/li>\n<li>fb_fd&#xff1a;\u524d\u9762\u6253\u5f00\u7684 Framebuffer \u6587\u4ef6\u63cf\u8ff0\u7b26<\/li>\n<li>\u6700\u540e\u7684 0&#xff1a;\u4ece Framebuffer \u6620\u5c04\u533a\u57df\u7684\u8d77\u59cb\u4f4d\u7f6e\u5f00\u59cb\u6620\u5c04<\/li>\n<\/ul>\n<p>mmap() \u6210\u529f\u4ee5\u540e&#xff0c;fb_mem \u5c31\u6307\u5411\u4e86\u5f53\u524d\u8fdb\u7a0b\u865a\u62df\u5730\u5740\u7a7a\u95f4\u4e2d\u7684\u4e00\u5757\u5185\u5b58&#xff0c;\u800c\u8fd9\u5757\u865a\u62df\u5185\u5b58\u5b9e\u9645\u4e0a\u5bf9\u5e94\u7740 Framebuffer \u7684\u663e\u793a\u7f13\u51b2\u533a\u3002\u6b64\u540e&#xff0c;\u6211\u4eec\u53ea\u9700\u8981\u4fee\u6539 fb_mem \u6307\u5411\u7684\u5185\u5b58\u5185\u5bb9&#xff0c;\u5b9e\u9645\u4e0a\u5c31\u662f\u5728\u4fee\u6539 Framebuffer \u4e2d\u4fdd\u5b58\u7684\u50cf\u7d20\u6570\u636e\u3002<\/p>\n<hr \/>\n<h4>\u4e09\u3001\u8ba1\u7b97\u4e00\u4e2a\u5c4f\u5e55\u50cf\u7d20\u5bf9\u5e94\u7684 Framebuffer \u5730\u5740<\/h4>\n<p>\u5b8c\u6210\u6620\u5c04\u4ee5\u540e&#xff0c;\u6211\u4eec\u5c31\u8981\u89e3\u51b3&#xff1a;\u5c4f\u5e55\u4e0a\u7684\u67d0\u4e00\u4e2a\u50cf\u7d20&#xff0c;\u5230\u5e95\u5bf9\u5e94 fb_mem \u4e2d\u7684\u54ea\u4e2a\u4f4d\u7f6e&#xff1f;<\/p>\n<p>\u5047\u8bbe\u6211\u4eec\u73b0\u5728\u5e0c\u671b\u4fee\u6539\u5c4f\u5e55\u5750\u6807 (x, y) \u5bf9\u5e94\u7684\u50cf\u7d20\u3002<\/p>\n<p>\u9996\u5148\u9700\u8981\u77e5\u9053\u4e00\u4e2a\u50cf\u7d20\u5360\u7528\u591a\u5c11\u5b57\u8282\u3002<\/p>\n<p>\u5982\u679c\u5f53\u524d Framebuffer \u7684\u6bcf\u4e2a\u50cf\u7d20\u6309\u7167\u6574\u5b57\u8282\u5b58\u50a8&#xff0c;\u90a3\u4e48&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> bytes_per_pixel <span class=\"token operator\">&#061;<\/span> vinfo<span class=\"token punctuation\">.<\/span>bits_per_pixel <span class=\"token operator\">\/<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u63a5\u4e0b\u6765&#xff0c;\u6839\u636e&#xff1a;<\/p>\n<ul>\n<li>\u5f53\u524d\u50cf\u7d20\u4f4d\u4e8e\u7b2c\u51e0\u884c<\/li>\n<li>\u6bcf\u4e00\u884c\u5b9e\u9645\u5360\u591a\u5c11\u5b57\u8282<\/li>\n<li>\u5f53\u524d\u50cf\u7d20\u4f4d\u4e8e\u8fd9\u4e00\u884c\u4e2d\u7684\u7b2c\u51e0\u4e2a\u4f4d\u7f6e<\/li>\n<\/ul>\n<p>\u5c31\u53ef\u4ee5\u8ba1\u7b97\u5176\u5bf9\u5e94\u7684\u5185\u5b58\u5730\u5740&#xff1a;<\/p>\n<p><span class=\"token class-name\">uint8_t<\/span> <span class=\"token operator\">*<\/span>dst<span class=\"token punctuation\">;<\/span><\/p>\n<p>dst <span class=\"token operator\">&#061;<\/span> fb_mem<br \/>\n    <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span>y <span class=\"token operator\">&#043;<\/span> vinfo<span class=\"token punctuation\">.<\/span>yoffset<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> finfo<span class=\"token punctuation\">.<\/span>line_length<br \/>\n    <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span>x <span class=\"token operator\">&#043;<\/span> vinfo<span class=\"token punctuation\">.<\/span>xoffset<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> bytes_per_pixel<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u4e2a\u516c\u5f0f\u53ef\u4ee5\u62c6\u6210\u4e09\u4e2a\u90e8\u5206\u7406\u89e3\u3002<\/p>\n<p>\u9996\u5148&#xff1a;<\/p>\n<p>(y &#043; yoffset) \u00d7 line_length<\/p>\n<p>\u8868\u793a\u5148\u8df3\u8fc7\u524d\u9762\u7684\u82e5\u5e72\u884c&#xff0c;\u627e\u5230\u5f53\u524d\u50cf\u7d20\u6240\u5728\u884c\u7684\u8d77\u59cb\u4f4d\u7f6e\u3002<\/p>\n<ul>\n<li>\u6ce8\u610f\u4e00\u884c\u7684\u5b57\u8282\u6570\u662fline_length<\/li>\n<\/ul>\n<p>\u7136\u540e&#xff1a;<\/p>\n<p>(x &#043; xoffset) \u00d7 bytes_per_pixel<\/p>\n<p>\u8868\u793a\u5728\u5f53\u524d\u8fd9\u4e00\u884c\u4e2d\u7ee7\u7eed\u5411\u540e\u79fb\u52a8&#xff0c;\u627e\u5230\u7b2c x \u4e2a\u50cf\u7d20\u7684\u4f4d\u7f6e\u3002<\/p>\n<p>Framebuffer \u5728\u5185\u5b58\u4e2d\u672c\u8d28\u4e0a\u4ecd\u7136\u662f\u4e00\u6bb5\u7ebf\u6027\u7a7a\u95f4&#xff0c;\u6240\u8c13\u4e8c\u7ef4\u5c4f\u5e55&#xff0c;\u53ea\u662f\u6211\u4eec\u6839\u636e\u6bcf\u4e00\u884c\u7684\u957f\u5ea6\u548c\u50cf\u7d20\u5750\u6807&#xff0c;\u5bf9\u8fd9\u6bb5\u7ebf\u6027\u7a7a\u95f4\u8fdb\u884c\u4e8c\u7ef4\u89e3\u91ca\u3002<\/p>\n<hr \/>\n<h4>\u56db\u3001\u6839\u636e Framebuffer \u7684\u50cf\u7d20\u683c\u5f0f\u8f6c\u6362 RGB24 \u6570\u636e<\/h4>\n<p>\u627e\u5230\u76ee\u6807\u50cf\u7d20\u7684\u5730\u5740\u4e4b\u540e&#xff0c;\u8fd8\u4e0d\u80fd\u76f4\u63a5\u628a RGB24 \u4e2d\u7684\u4e09\u4e2a\u5b57\u8282\u590d\u5236\u8fc7\u53bb&#xff0c;\u8fd9\u662f\u56e0\u4e3a RGB24 \u4e2d\u6bcf\u4e2a\u989c\u8272\u5206\u91cf\u90fd\u662f 8 bit&#xff1a;<\/p>\n<p>\u800c Framebuffer \u4e2d\u6bcf\u4e2a\u989c\u8272\u5206\u91cf\u5360\u7528\u7684\u4f4d\u6570\u53ef\u80fd\u4e0d\u540c\u3002\u4f8b\u5982 RGB565 \u4e2d&#xff1a;<\/p>\n<ul>\n<li>Red 5bit<\/li>\n<li>Green 6bit<\/li>\n<li>Blue 5it<\/li>\n<\/ul>\n<p>\u6240\u4ee5&#xff0c;\u5728\u771f\u6b63\u5199\u5165\u4e4b\u524d&#xff0c;\u9700\u8981\u6839\u636e red\u3001green\u3001blue \u4e2d\u8bb0\u5f55\u7684 length \u548c offset&#xff0c;\u628a RGB24 \u4e2d\u7684\u4e09\u4e2a\u989c\u8272\u5206\u91cf\u91cd\u65b0\u8f6c\u6362\u5e76\u7ec4\u5408\u6210 Framebuffer \u6240\u9700\u8981\u7684\u4e00\u4e2a\u50cf\u7d20\u503c\u3002<\/p>\n<p>\u4f8b\u5982&#xff0c;\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570&#xff0c;\u5c06\u4e00\u4e2a 8 bit \u989c\u8272\u5206\u91cf\u8f6c\u6362\u5230 Framebuffer \u5bf9\u5e94\u7684 bitfield \u4e2d&#xff1a;<\/p>\n<p><span class=\"token keyword\">static<\/span> <span class=\"token class-name\">uint32_t<\/span> <span class=\"token function\">pack_channel<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">uint8_t<\/span> value<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">fb_bitfield<\/span> field<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>field<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token class-name\">uint32_t<\/span> max_value <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1U<\/span> <span class=\"token operator\">&lt;&lt;<\/span> field<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">)<\/span> <span class=\"token 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