{"id":256,"date":"2026-04-07T22:59:43","date_gmt":"2026-04-07T14:59:43","guid":{"rendered":"http:\/\/www.millscience.cn\/?p=256"},"modified":"2026-04-07T22:59:46","modified_gmt":"2026-04-07T14:59:46","slug":"jpegshow","status":"publish","type":"post","link":"https:\/\/www.millscience.cn\/index.php\/jpegshow\/","title":{"rendered":"JPEG\u56fe\u50cf\u7684\u663e\u793a"},"content":{"rendered":"\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(3 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"\u590d\u5236\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>#include &lt;stdio.h>\n#include &lt;setjmp.h>\n#include &lt;sys\/stat.h>\n#include &lt;fcntl.h>\n#include &lt;sys\/mman.h>\n#include &lt;unistd.h>\n#include &lt;string.h>\n#include &lt;stdlib.h>\n#include &lt;\/home\/gec\/software\/installed\/jepg\/include\/jpeglib.h>\nstruct my_error_mgr {\n  struct jpeg_error_mgr pub;\t\/* \"public\" fields *\/\n\n  jmp_buf setjmp_buffer;\t\/* for return to caller *\/\n};\n\ntypedef struct my_error_mgr * my_error_ptr;\n\nMETHODDEF(void)\nmy_error_exit (j_common_ptr cinfo)\n{\n  \/* cinfo->err really points to a my_error_mgr struct, so coerce pointer *\/\n  my_error_ptr myerr = (my_error_ptr) cinfo->err;\n\n  \/* Always display the message. *\/\n  \/* We could postpone this until after returning, if we chose. *\/\n  (*cinfo->err->output_message) (cinfo);\n\n  \/* Return control to the setjmp point *\/\n  longjmp(myerr->setjmp_buffer, 1);\n}\n\nGLOBAL(int)\nread_JPEG_file (char * filename,int* lcd_buf,const char* x_start,const char* y_start)\n{\n\n  struct jpeg_decompress_struct cinfo;\n\n  struct my_error_mgr jerr;\n  \/* More stuff *\/\n  FILE * infile;\t\t\/* source file *\/\n  JSAMPARRAY buffer;\t\t\/* Output row buffer *\/\n  int row_stride;\t\t\/* physical row width in output buffer *\/\n\n\n  if ((infile = fopen(filename, \"rb\")) == NULL) {\n    fprintf(stderr, \"can't open %s\\n\", filename);\n    return 0;\n  }\n\n  cinfo.err = jpeg_std_error(&amp;jerr.pub);\n  jerr.pub.error_exit = my_error_exit;\n\n  if (setjmp(jerr.setjmp_buffer)) {\n\n    jpeg_destroy_decompress(&amp;cinfo);\n    fclose(infile);\n    return 0;\n  }\n\n  jpeg_create_decompress(&amp;cinfo);\n\n\n\n  jpeg_stdio_src(&amp;cinfo, infile);\n\n\n\n  (void) jpeg_read_header(&amp;cinfo, TRUE);\n\n\n  (void) jpeg_start_decompress(&amp;cinfo);\n\n  row_stride = cinfo.output_width * cinfo.output_components;\n  buffer = (*cinfo.mem->alloc_sarray)\n\t\t((j_common_ptr) &amp;cinfo, JPOOL_IMAGE, row_stride, 1);\n\n  \/\/ \u5728 while \u5faa\u73af\u5916\u5b9a\u4e49\u4e00\u4e2a y\uff0c\u7528\u4e8e\u8bb0\u5f55\u5f53\u524d\u6b63\u5728\u5904\u7406\u5c4f\u5e55\u7684\u7b2c\u51e0\u884c\n  int y = 0; \n  int xnum = atoi(x_start);\n  int ynum = atoi(y_start);\n  while (cinfo.output_scanline &lt; cinfo.output_height) {\n    \/\/ \u6bcf\u6b21\u8bfb\u53d6 1 \u884c\u6570\u636e\uff0c\u5b58\u5165 buffer \u4e2d\n    (void) jpeg_read_scanlines(&amp;cinfo, buffer, 1);\n    \n    \/\/ buffer&#91;0&#93; \u6307\u5411\u7684\u5c31\u662f\u521a\u521a\u89e3\u7801\u51fa\u6765\u7684\u8fd9\u4e00\u884c RGB \u6570\u636e\n    unsigned char *row_data = buffer&#91;0&#93;;\n\n    \/\/ \u904d\u5386\u8fd9\u4e00\u884c\u7684\u6bcf\u4e00\u4e2a\u50cf\u7d20\n    for (int x = 0; x &lt; cinfo.output_width; x++) {\n        \n        \/\/ \u3010\u5173\u952e\u4fdd\u62a4\u4f1e\u3011\uff1a\u9632\u6b62\u56fe\u7247\u5c3a\u5bf8\u5927\u4e8e\u5c4f\u5e55\u5bfc\u81f4\u6bb5\u9519\u8bef\u8d8a\u754c\n        if (x &lt; 800 &amp;&amp; y &lt; 480 &amp;&amp; ynum &lt; 480 - cinfo.output_height &amp;&amp; xnum &lt; 800 - cinfo.output_width) {\n            \n            \/\/ \u4f9d\u6b21\u53d6\u51fa R, G, B \u5206\u91cf (\u6ce8\u610f\u8fd9\u91cc\u7684\u987a\u5e8f\u548c BMP \u4e0d\u540c)\n            unsigned char r = row_data&#91;x * 3 + 0&#93;;\n            unsigned char g = row_data&#91;x * 3 + 1&#93;;\n            unsigned char b = row_data&#91;x * 3 + 2&#93;;\n\n            \/\/ \u62fc\u88c5\u6210 LCD \u9700\u8981\u7684 32\u4f4d ARGB \u683c\u5f0f (0x00RRGGBB)\n            int color = (r &lt;&lt; 16) | (g &lt;&lt; 8) | b;\n\n            \/\/ \u5199\u5165\u5185\u5b58\u6620\u5c04\u7684\u663e\u5b58\u4e2d\n            lcd_buf&#91;(800*ynum+xnum)+(800 * y + x)&#93; = color;\n        }else{\n          printf(\"\u56fe\u7247\u5237\u65b0\u4f4d\u7f6e\u8d85\u8fc7\u5c4f\u5e55\uff01\\n\");\n          printf(\"\u56fe\u7247\u5927\u5c0f\u5e94\u5c0f\u4e8e800*480\\n\");\n          printf(\"\u56fe\u7247\u5237\u65b0\u4f4d\u7f6e\uff1ax\u8f740~%d\uff0cy\u8f740~%d\\n\",799 - cinfo.output_width,479 - cinfo.output_height);\n          return 0;\n        }\n    }\n    \/\/ \u4e00\u884c\u5904\u7406\u5b8c\u6bd5\uff0c\u884c\u53f7 +1\n    y++; \n  }\n\n  (void) jpeg_finish_decompress(&amp;cinfo);\n\n  jpeg_destroy_decompress(&amp;cinfo);\n\n  fclose(infile);\n\n  return 1;\n}\n\n\n\nint main(int argc , char* argv[])\n{ \n    \/\/\u53c2\u6570\u68c0\u67e5\n    if(argc!=4)\n    { \n        printf(\"\u7528\u6cd5: %s &lt;\u56fe\u7247\u8def\u5f84> &lt;x\u8f74\u5750\u6807> &lt;y\u8f74\u5750\u6807>\\n\", argv&#91;0&#93;);\n        return 0;\n    }\n\n    \/\/\u6253\u5f00lcd\u5c4f\u5e55\n    int lcd = open(\"\/dev\/ubuntu_lcd\",O_RDWR);\n    if(lcd == -1)\n    {\n      printf(\"lcd\u5c4f\u5e55\u6253\u5f00\u5931\u8d25\uff01\\n\");\n      return 0;\n    }\n\n    \/\/\u5185\u5b58\u6620\u5c04\n    int* lcd_buf = mmap(NULL,800*480*4,PROT_READ|PROT_WRITE,MAP_SHARED,lcd,0);\n    if (lcd_buf == MAP_FAILED) {\n        perror(\"mmap\");\n        close(lcd);\n        return 1;\n    }\n\n    \/\/\u6e05\u9664\u5c4f\u5e55\u4e3a\u767d\u8272\n    memset(lcd_buf,0xFFFFFFFF,800*480*4);\n\n    \/\/\u8bfb\u53d6jpeg\u4fe1\u606f\u5e76\u5237\u5165\u5185\u5b58\n    read_JPEG_file (argv&#91;1&#93;,lcd_buf,argv&#91;2&#93;,argv&#91;3&#93;);\n\n    \/\/\u5173\u95ed\u8bbe\u5907\uff0c\u91ca\u653e\u5185\u5b58\n    close(lcd);\n    munmap(lcd_buf,800*480*4);\n\n    return 0;\n}<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;stdio.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;setjmp.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;sys\/stat.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;fcntl.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;sys\/mman.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;unistd.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;string.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;stdlib.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;\/home\/gec\/software\/installed\/jepg\/include\/jpeglib.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> my_error_mgr {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> jpeg_error_mgr pub;<\/span><span style=\"color: #6A9955\">\t\/* &quot;public&quot; fields *\/<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  jmp_buf setjmp_buffer;<\/span><span style=\"color: #6A9955\">\t\/* for return to caller *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">};<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">typedef<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> my_error_mgr * my_error_ptr;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #DCDCAA\">METHODDEF<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #569CD6\">void<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #DCDCAA\">my_error_exit<\/span><span style=\"color: #D4D4D4\"> (j_common_ptr <\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">  \/* cinfo-&gt;err really points to a my_error_mgr struct, so coerce pointer *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  my_error_ptr myerr = (my_error_ptr) <\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #9CDCFE\">err<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">  \/* Always display the message. *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">  \/* We could postpone this until after returning, if we chose. *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  (*<\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #9CDCFE\">err<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #9CDCFE\">output_message<\/span><span style=\"color: #D4D4D4\">) (cinfo);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">  \/* Return control to the setjmp point *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #DCDCAA\">longjmp<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">myerr<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #9CDCFE\">setjmp_buffer<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #DCDCAA\">GLOBAL<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #DCDCAA\">read_JPEG_file<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> * <\/span><span style=\"color: #9CDCFE\">filename<\/span><span style=\"color: #D4D4D4\">,<\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\">* <\/span><span style=\"color: #9CDCFE\">lcd_buf<\/span><span style=\"color: #D4D4D4\">,<\/span><span style=\"color: #569CD6\">const<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\">* <\/span><span style=\"color: #9CDCFE\">x_start<\/span><span style=\"color: #D4D4D4\">,<\/span><span style=\"color: #569CD6\">const<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\">* <\/span><span style=\"color: #9CDCFE\">y_start<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">{<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> jpeg_decompress_struct cinfo;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #569CD6\">struct<\/span><span style=\"color: #D4D4D4\"> my_error_mgr jerr;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">  \/* More stuff *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  FILE * infile;<\/span><span style=\"color: #6A9955\">\t\t\/* source file *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  JSAMPARRAY buffer;<\/span><span style=\"color: #6A9955\">\t\t\/* Output row buffer *\/<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> row_stride;<\/span><span style=\"color: #6A9955\">\t\t\/* physical row width in output buffer *\/<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> ((infile = <\/span><span style=\"color: #DCDCAA\">fopen<\/span><span style=\"color: #D4D4D4\">(filename, <\/span><span style=\"color: #CE9178\">&quot;rb&quot;<\/span><span style=\"color: #D4D4D4\">)) == <\/span><span style=\"color: #569CD6\">NULL<\/span><span style=\"color: #D4D4D4\">) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fprintf<\/span><span style=\"color: #D4D4D4\">(stderr, <\/span><span style=\"color: #CE9178\">&quot;can&#39;t open <\/span><span style=\"color: #9CDCFE\">%s<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">, filename);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">err<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #DCDCAA\">jpeg_std_error<\/span><span style=\"color: #D4D4D4\">(&amp;<\/span><span style=\"color: #9CDCFE\">jerr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">pub<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #9CDCFE\">jerr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">pub<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">error_exit<\/span><span style=\"color: #D4D4D4\"> = my_error_exit;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #DCDCAA\">setjmp<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">jerr<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">setjmp_buffer<\/span><span style=\"color: #D4D4D4\">)) {<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">jpeg_destroy_decompress<\/span><span style=\"color: #D4D4D4\">(&amp;cinfo);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fclose<\/span><span style=\"color: #D4D4D4\">(infile);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #DCDCAA\">jpeg_create_decompress<\/span><span style=\"color: #D4D4D4\">(&amp;cinfo);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #DCDCAA\">jpeg_stdio_src<\/span><span style=\"color: #D4D4D4\">(&amp;cinfo, infile);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  (<\/span><span style=\"color: #569CD6\">void<\/span><span style=\"color: #D4D4D4\">) <\/span><span style=\"color: #DCDCAA\">jpeg_read_header<\/span><span style=\"color: #D4D4D4\">(&amp;cinfo, <\/span><span style=\"color: #569CD6\">TRUE<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  (<\/span><span style=\"color: #569CD6\">void<\/span><span style=\"color: #D4D4D4\">) <\/span><span style=\"color: #DCDCAA\">jpeg_start_decompress<\/span><span style=\"color: #D4D4D4\">(&amp;cinfo);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  row_stride = <\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">output_width<\/span><span style=\"color: #D4D4D4\"> * <\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">output_components<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  buffer = (*<\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">mem<\/span><span style=\"color: #D4D4D4\">-&gt;<\/span><span style=\"color: #9CDCFE\">alloc_sarray<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">\t\t((j_common_ptr) &amp;cinfo, JPOOL_IMAGE, row_stride, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #6A9955\">\/\/ \u5728 while \u5faa\u73af\u5916\u5b9a\u4e49\u4e00\u4e2a y\uff0c\u7528\u4e8e\u8bb0\u5f55\u5f53\u524d\u6b63\u5728\u5904\u7406\u5c4f\u5e55\u7684\u7b2c\u51e0\u884c<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> y = <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">; <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> xnum = <\/span><span style=\"color: #DCDCAA\">atoi<\/span><span style=\"color: #D4D4D4\">(x_start);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> ynum = <\/span><span style=\"color: #DCDCAA\">atoi<\/span><span style=\"color: #D4D4D4\">(y_start);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #C586C0\">while<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">output_scanline<\/span><span style=\"color: #D4D4D4\"> &lt; <\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">output_height<\/span><span style=\"color: #D4D4D4\">) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u6bcf\u6b21\u8bfb\u53d6 1 \u884c\u6570\u636e\uff0c\u5b58\u5165 buffer \u4e2d<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    (<\/span><span style=\"color: #569CD6\">void<\/span><span style=\"color: #D4D4D4\">) <\/span><span style=\"color: #DCDCAA\">jpeg_read_scanlines<\/span><span style=\"color: #D4D4D4\">(&amp;cinfo, buffer, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ buffer&#91;0&#93; \u6307\u5411\u7684\u5c31\u662f\u521a\u521a\u89e3\u7801\u51fa\u6765\u7684\u8fd9\u4e00\u884c RGB \u6570\u636e<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">unsigned<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> *row_data = <\/span><span style=\"color: #9CDCFE\">buffer<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">&#93;;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u904d\u5386\u8fd9\u4e00\u884c\u7684\u6bcf\u4e00\u4e2a\u50cf\u7d20<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">for<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> x = <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">; x &lt; <\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">output_width<\/span><span style=\"color: #D4D4D4\">; x++) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #6A9955\">\/\/ \u3010\u5173\u952e\u4fdd\u62a4\u4f1e\u3011\uff1a\u9632\u6b62\u56fe\u7247\u5c3a\u5bf8\u5927\u4e8e\u5c4f\u5e55\u5bfc\u81f4\u6bb5\u9519\u8bef\u8d8a\u754c<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (x &lt; <\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\"> &amp;&amp; y &lt; <\/span><span style=\"color: #B5CEA8\">480<\/span><span style=\"color: #D4D4D4\"> &amp;&amp; ynum &lt; <\/span><span style=\"color: #B5CEA8\">480<\/span><span style=\"color: #D4D4D4\"> - <\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">output_height<\/span><span style=\"color: #D4D4D4\"> &amp;&amp; xnum &lt; <\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\"> - <\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">output_width<\/span><span style=\"color: #D4D4D4\">) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #6A9955\">\/\/ \u4f9d\u6b21\u53d6\u51fa R, G, B \u5206\u91cf (\u6ce8\u610f\u8fd9\u91cc\u7684\u987a\u5e8f\u548c BMP \u4e0d\u540c)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #569CD6\">unsigned<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> r = <\/span><span style=\"color: #9CDCFE\">row_data<\/span><span style=\"color: #D4D4D4\">&#91;x * <\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\"> + <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">&#93;;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #569CD6\">unsigned<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> g = <\/span><span style=\"color: #9CDCFE\">row_data<\/span><span style=\"color: #D4D4D4\">&#91;x * <\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\"> + <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">&#93;;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #569CD6\">unsigned<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> b = <\/span><span style=\"color: #9CDCFE\">row_data<\/span><span style=\"color: #D4D4D4\">&#91;x * <\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\"> + <\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">&#93;;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #6A9955\">\/\/ \u62fc\u88c5\u6210 LCD \u9700\u8981\u7684 32\u4f4d ARGB \u683c\u5f0f (0x00RRGGBB)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> color = (r &lt;&lt; <\/span><span style=\"color: #B5CEA8\">16<\/span><span style=\"color: #D4D4D4\">) | (g &lt;&lt; <\/span><span style=\"color: #B5CEA8\">8<\/span><span style=\"color: #D4D4D4\">) | b;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #6A9955\">\/\/ \u5199\u5165\u5185\u5b58\u6620\u5c04\u7684\u663e\u5b58\u4e2d<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #9CDCFE\">lcd_buf<\/span><span style=\"color: #D4D4D4\">&#91;(<\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\">*ynum+xnum)+(<\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\"> * y + x)&#93; = color;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        }<\/span><span style=\"color: #C586C0\">else<\/span><span style=\"color: #D4D4D4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">          <\/span><span style=\"color: #DCDCAA\">printf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u56fe\u7247\u5237\u65b0\u4f4d\u7f6e\u8d85\u8fc7\u5c4f\u5e55\uff01<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">          <\/span><span style=\"color: #DCDCAA\">printf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u56fe\u7247\u5927\u5c0f\u5e94\u5c0f\u4e8e800*480<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">          <\/span><span style=\"color: #DCDCAA\">printf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u56fe\u7247\u5237\u65b0\u4f4d\u7f6e\uff1ax\u8f740~<\/span><span style=\"color: #9CDCFE\">%d<\/span><span style=\"color: #CE9178\">\uff0cy\u8f740~<\/span><span style=\"color: #9CDCFE\">%d<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">,<\/span><span style=\"color: #B5CEA8\">799<\/span><span style=\"color: #D4D4D4\"> - <\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">output_width<\/span><span style=\"color: #D4D4D4\">,<\/span><span style=\"color: #B5CEA8\">479<\/span><span style=\"color: #D4D4D4\"> - <\/span><span style=\"color: #9CDCFE\">cinfo<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">output_height<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">          <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        }<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u4e00\u884c\u5904\u7406\u5b8c\u6bd5\uff0c\u884c\u53f7 +1<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    y++; <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  (<\/span><span style=\"color: #569CD6\">void<\/span><span style=\"color: #D4D4D4\">) <\/span><span style=\"color: #DCDCAA\">jpeg_finish_decompress<\/span><span style=\"color: #D4D4D4\">(&amp;cinfo);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #DCDCAA\">jpeg_destroy_decompress<\/span><span style=\"color: #D4D4D4\">(&amp;cinfo);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #DCDCAA\">fclose<\/span><span style=\"color: #D4D4D4\">(infile);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">main<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">argc<\/span><span style=\"color: #D4D4D4\"> , <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\">* <\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #569CD6\">[]<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">{ <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/\u53c2\u6570\u68c0\u67e5<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\">(argc!=<\/span><span style=\"color: #B5CEA8\">4<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    { <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">printf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u7528\u6cd5: <\/span><span style=\"color: #9CDCFE\">%s<\/span><span style=\"color: #CE9178\"> &lt;\u56fe\u7247\u8def\u5f84&gt; &lt;x\u8f74\u5750\u6807&gt; &lt;y\u8f74\u5750\u6807&gt;<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">&#93;);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/\u6253\u5f00lcd\u5c4f\u5e55<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> lcd = <\/span><span style=\"color: #DCDCAA\">open<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\/dev\/ubuntu_lcd&quot;<\/span><span style=\"color: #D4D4D4\">,O_RDWR);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\">(lcd == -<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">      <\/span><span style=\"color: #DCDCAA\">printf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;lcd\u5c4f\u5e55\u6253\u5f00\u5931\u8d25\uff01<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">      <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/\u5185\u5b58\u6620\u5c04<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\">* lcd_buf = <\/span><span style=\"color: #DCDCAA\">mmap<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #569CD6\">NULL<\/span><span style=\"color: #D4D4D4\">,<\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\">*<\/span><span style=\"color: #B5CEA8\">480<\/span><span style=\"color: #D4D4D4\">*<\/span><span style=\"color: #B5CEA8\">4<\/span><span style=\"color: #D4D4D4\">,PROT_READ|PROT_WRITE,MAP_SHARED,lcd,<\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (lcd_buf == MAP_FAILED) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">perror<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;mmap&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">close<\/span><span style=\"color: #D4D4D4\">(lcd);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/\u6e05\u9664\u5c4f\u5e55\u4e3a\u767d\u8272<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">memset<\/span><span style=\"color: #D4D4D4\">(lcd_buf,<\/span><span style=\"color: #B5CEA8\">0xFFFFFFFF<\/span><span style=\"color: #D4D4D4\">,<\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\">*<\/span><span style=\"color: #B5CEA8\">480<\/span><span style=\"color: #D4D4D4\">*<\/span><span style=\"color: #B5CEA8\">4<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/\u8bfb\u53d6jpeg\u4fe1\u606f\u5e76\u5237\u5165\u5185\u5b58<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">read_JPEG_file<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">&#93;,lcd_buf,<\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">&#93;,<\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\">&#93;);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/\u5173\u95ed\u8bbe\u5907\uff0c\u91ca\u653e\u5185\u5b58<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">close<\/span><span style=\"color: #D4D4D4\">(lcd);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">munmap<\/span><span style=\"color: #D4D4D4\">(lcd_buf,<\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\">*<\/span><span style=\"color: #B5CEA8\">480<\/span><span style=\"color: #D4D4D4\">*<\/span><span style=\"color: #B5CEA8\">4<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span><\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":257,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19,13],"tags":[],"class_list":["post-256","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-embedded","category-learning"],"_links":{"self":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts\/256","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/comments?post=256"}],"version-history":[{"count":1,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts\/256\/revisions"}],"predecessor-version":[{"id":258,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts\/256\/revisions\/258"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/media\/257"}],"wp:attachment":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/media?parent=256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/categories?post=256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/tags?post=256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}